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authorLaurent Pinchart <laurent.pinchart@skynet.be>2008-06-30 14:04:50 -0400
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-06-30 16:31:13 -0400
commitc0efd232929c2cd87238de2cccdaf4e845be5b0c (patch)
tree46febbdb8d29e4e081628778740c206c20024e80 /drivers/media
parente1441b9a41c33aa9236008a7cfe49a8e723fb397 (diff)
V4L/DVB (8145a): USB Video Class driver
This driver supports video input devices compliant with the USB Video Class specification. This means lots of currently manufactured webcams, and probably most of the future ones. Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/video/Kconfig8
-rw-r--r--drivers/media/video/Makefile2
-rw-r--r--drivers/media/video/uvc/Makefile3
-rw-r--r--drivers/media/video/uvc/uvc_ctrl.c1256
-rw-r--r--drivers/media/video/uvc/uvc_driver.c1955
-rw-r--r--drivers/media/video/uvc/uvc_isight.c134
-rw-r--r--drivers/media/video/uvc/uvc_queue.c477
-rw-r--r--drivers/media/video/uvc/uvc_status.c207
-rw-r--r--drivers/media/video/uvc/uvc_v4l2.c1105
-rw-r--r--drivers/media/video/uvc/uvc_video.c934
-rw-r--r--drivers/media/video/uvc/uvcvideo.h796
11 files changed, 6877 insertions, 0 deletions
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 3b26fbd3e558..5ccb0aeca8cc 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -793,6 +793,14 @@ menuconfig V4L_USB_DRIVERS
793 793
794if V4L_USB_DRIVERS && USB 794if V4L_USB_DRIVERS && USB
795 795
796config USB_VIDEO_CLASS
797 tristate "USB Video Class (UVC)"
798 ---help---
799 Support for the USB Video Class (UVC). Currently only video
800 input devices, such as webcams, are supported.
801
802 For more information see: <http://linux-uvc.berlios.de/>
803
796source "drivers/media/video/pvrusb2/Kconfig" 804source "drivers/media/video/pvrusb2/Kconfig"
797 805
798source "drivers/media/video/em28xx/Kconfig" 806source "drivers/media/video/em28xx/Kconfig"
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index dff0d6abe917..ecbbfaab24d5 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -136,6 +136,8 @@ obj-$(CONFIG_SOC_CAMERA_MT9V022) += mt9v022.o
136 136
137obj-$(CONFIG_VIDEO_AU0828) += au0828/ 137obj-$(CONFIG_VIDEO_AU0828) += au0828/
138 138
139obj-$(CONFIG_USB_VIDEO_CLASS) += uvc/
140
139EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core 141EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
140EXTRA_CFLAGS += -Idrivers/media/dvb/frontends 142EXTRA_CFLAGS += -Idrivers/media/dvb/frontends
141EXTRA_CFLAGS += -Idrivers/media/common/tuners 143EXTRA_CFLAGS += -Idrivers/media/common/tuners
diff --git a/drivers/media/video/uvc/Makefile b/drivers/media/video/uvc/Makefile
new file mode 100644
index 000000000000..fb39bbf9b5ac
--- /dev/null
+++ b/drivers/media/video/uvc/Makefile
@@ -0,0 +1,3 @@
1uvcvideo-objs := uvc_driver.o uvc_queue.o uvc_v4l2.o uvc_video.o uvc_ctrl.o \
2 uvc_status.o uvc_isight.o
3obj-$(CONFIG_USB_VIDEO_CLASS) := uvcvideo.o
diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c
new file mode 100644
index 000000000000..f0ee46d15540
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_ctrl.c
@@ -0,0 +1,1256 @@
1/*
2 * uvc_ctrl.c -- USB Video Class driver - Controls
3 *
4 * Copyright (C) 2005-2008
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/version.h>
16#include <linux/list.h>
17#include <linux/module.h>
18#include <linux/uaccess.h>
19#include <linux/usb.h>
20#include <linux/videodev2.h>
21#include <linux/vmalloc.h>
22#include <linux/wait.h>
23#include <asm/atomic.h>
24
25#include "uvcvideo.h"
26
27#define UVC_CTRL_NDATA 2
28#define UVC_CTRL_DATA_CURRENT 0
29#define UVC_CTRL_DATA_BACKUP 1
30
31/* ------------------------------------------------------------------------
32 * Control, formats, ...
33 */
34
35static struct uvc_control_info uvc_ctrls[] = {
36 {
37 .entity = UVC_GUID_UVC_PROCESSING,
38 .selector = PU_BRIGHTNESS_CONTROL,
39 .index = 0,
40 .size = 2,
41 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
42 | UVC_CONTROL_RESTORE,
43 },
44 {
45 .entity = UVC_GUID_UVC_PROCESSING,
46 .selector = PU_CONTRAST_CONTROL,
47 .index = 1,
48 .size = 2,
49 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
50 | UVC_CONTROL_RESTORE,
51 },
52 {
53 .entity = UVC_GUID_UVC_PROCESSING,
54 .selector = PU_HUE_CONTROL,
55 .index = 2,
56 .size = 2,
57 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
58 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
59 },
60 {
61 .entity = UVC_GUID_UVC_PROCESSING,
62 .selector = PU_SATURATION_CONTROL,
63 .index = 3,
64 .size = 2,
65 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
66 | UVC_CONTROL_RESTORE,
67 },
68 {
69 .entity = UVC_GUID_UVC_PROCESSING,
70 .selector = PU_SHARPNESS_CONTROL,
71 .index = 4,
72 .size = 2,
73 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
74 | UVC_CONTROL_RESTORE,
75 },
76 {
77 .entity = UVC_GUID_UVC_PROCESSING,
78 .selector = PU_GAMMA_CONTROL,
79 .index = 5,
80 .size = 2,
81 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
82 | UVC_CONTROL_RESTORE,
83 },
84 {
85 .entity = UVC_GUID_UVC_PROCESSING,
86 .selector = PU_BACKLIGHT_COMPENSATION_CONTROL,
87 .index = 8,
88 .size = 2,
89 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
90 | UVC_CONTROL_RESTORE,
91 },
92 {
93 .entity = UVC_GUID_UVC_PROCESSING,
94 .selector = PU_GAIN_CONTROL,
95 .index = 9,
96 .size = 2,
97 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
98 | UVC_CONTROL_RESTORE,
99 },
100 {
101 .entity = UVC_GUID_UVC_PROCESSING,
102 .selector = PU_POWER_LINE_FREQUENCY_CONTROL,
103 .index = 10,
104 .size = 1,
105 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
106 | UVC_CONTROL_RESTORE,
107 },
108 {
109 .entity = UVC_GUID_UVC_PROCESSING,
110 .selector = PU_HUE_AUTO_CONTROL,
111 .index = 11,
112 .size = 1,
113 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
114 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
115 },
116 {
117 .entity = UVC_GUID_UVC_CAMERA,
118 .selector = CT_AE_MODE_CONTROL,
119 .index = 1,
120 .size = 1,
121 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
122 | UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES
123 | UVC_CONTROL_RESTORE,
124 },
125 {
126 .entity = UVC_GUID_UVC_CAMERA,
127 .selector = CT_AE_PRIORITY_CONTROL,
128 .index = 2,
129 .size = 1,
130 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
131 | UVC_CONTROL_RESTORE,
132 },
133 {
134 .entity = UVC_GUID_UVC_CAMERA,
135 .selector = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
136 .index = 3,
137 .size = 4,
138 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
139 | UVC_CONTROL_RESTORE,
140 },
141 {
142 .entity = UVC_GUID_UVC_CAMERA,
143 .selector = CT_FOCUS_ABSOLUTE_CONTROL,
144 .index = 5,
145 .size = 2,
146 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
147 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
148 },
149 {
150 .entity = UVC_GUID_UVC_CAMERA,
151 .selector = CT_FOCUS_AUTO_CONTROL,
152 .index = 17,
153 .size = 1,
154 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
155 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
156 },
157 {
158 .entity = UVC_GUID_UVC_PROCESSING,
159 .selector = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
160 .index = 12,
161 .size = 1,
162 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
163 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
164 },
165 {
166 .entity = UVC_GUID_UVC_PROCESSING,
167 .selector = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
168 .index = 6,
169 .size = 2,
170 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
171 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
172 },
173 {
174 .entity = UVC_GUID_UVC_PROCESSING,
175 .selector = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
176 .index = 13,
177 .size = 1,
178 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
179 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
180 },
181 {
182 .entity = UVC_GUID_UVC_PROCESSING,
183 .selector = PU_WHITE_BALANCE_COMPONENT_CONTROL,
184 .index = 7,
185 .size = 4,
186 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
187 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
188 },
189};
190
191static struct uvc_menu_info power_line_frequency_controls[] = {
192 { 0, "Disabled" },
193 { 1, "50 Hz" },
194 { 2, "60 Hz" },
195};
196
197static struct uvc_menu_info exposure_auto_controls[] = {
198 { 1, "Manual Mode" },
199 { 2, "Auto Mode" },
200 { 4, "Shutter Priority Mode" },
201 { 8, "Aperture Priority Mode" },
202};
203
204static struct uvc_control_mapping uvc_ctrl_mappings[] = {
205 {
206 .id = V4L2_CID_BRIGHTNESS,
207 .name = "Brightness",
208 .entity = UVC_GUID_UVC_PROCESSING,
209 .selector = PU_BRIGHTNESS_CONTROL,
210 .size = 16,
211 .offset = 0,
212 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
213 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
214 },
215 {
216 .id = V4L2_CID_CONTRAST,
217 .name = "Contrast",
218 .entity = UVC_GUID_UVC_PROCESSING,
219 .selector = PU_CONTRAST_CONTROL,
220 .size = 16,
221 .offset = 0,
222 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
223 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
224 },
225 {
226 .id = V4L2_CID_HUE,
227 .name = "Hue",
228 .entity = UVC_GUID_UVC_PROCESSING,
229 .selector = PU_HUE_CONTROL,
230 .size = 16,
231 .offset = 0,
232 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
233 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
234 },
235 {
236 .id = V4L2_CID_SATURATION,
237 .name = "Saturation",
238 .entity = UVC_GUID_UVC_PROCESSING,
239 .selector = PU_SATURATION_CONTROL,
240 .size = 16,
241 .offset = 0,
242 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
243 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
244 },
245 {
246 .id = V4L2_CID_SHARPNESS,
247 .name = "Sharpness",
248 .entity = UVC_GUID_UVC_PROCESSING,
249 .selector = PU_SHARPNESS_CONTROL,
250 .size = 16,
251 .offset = 0,
252 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
253 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
254 },
255 {
256 .id = V4L2_CID_GAMMA,
257 .name = "Gamma",
258 .entity = UVC_GUID_UVC_PROCESSING,
259 .selector = PU_GAMMA_CONTROL,
260 .size = 16,
261 .offset = 0,
262 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
263 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
264 },
265 {
266 .id = V4L2_CID_BACKLIGHT_COMPENSATION,
267 .name = "Backlight Compensation",
268 .entity = UVC_GUID_UVC_PROCESSING,
269 .selector = PU_BACKLIGHT_COMPENSATION_CONTROL,
270 .size = 16,
271 .offset = 0,
272 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
273 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
274 },
275 {
276 .id = V4L2_CID_GAIN,
277 .name = "Gain",
278 .entity = UVC_GUID_UVC_PROCESSING,
279 .selector = PU_GAIN_CONTROL,
280 .size = 16,
281 .offset = 0,
282 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
283 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
284 },
285 {
286 .id = V4L2_CID_POWER_LINE_FREQUENCY,
287 .name = "Power Line Frequency",
288 .entity = UVC_GUID_UVC_PROCESSING,
289 .selector = PU_POWER_LINE_FREQUENCY_CONTROL,
290 .size = 2,
291 .offset = 0,
292 .v4l2_type = V4L2_CTRL_TYPE_MENU,
293 .data_type = UVC_CTRL_DATA_TYPE_ENUM,
294 .menu_info = power_line_frequency_controls,
295 .menu_count = ARRAY_SIZE(power_line_frequency_controls),
296 },
297 {
298 .id = V4L2_CID_HUE_AUTO,
299 .name = "Hue, Auto",
300 .entity = UVC_GUID_UVC_PROCESSING,
301 .selector = PU_HUE_AUTO_CONTROL,
302 .size = 1,
303 .offset = 0,
304 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
305 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
306 },
307 {
308 .id = V4L2_CID_EXPOSURE_AUTO,
309 .name = "Exposure, Auto",
310 .entity = UVC_GUID_UVC_CAMERA,
311 .selector = CT_AE_MODE_CONTROL,
312 .size = 4,
313 .offset = 0,
314 .v4l2_type = V4L2_CTRL_TYPE_MENU,
315 .data_type = UVC_CTRL_DATA_TYPE_BITMASK,
316 .menu_info = exposure_auto_controls,
317 .menu_count = ARRAY_SIZE(exposure_auto_controls),
318 },
319 {
320 .id = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
321 .name = "Exposure, Auto Priority",
322 .entity = UVC_GUID_UVC_CAMERA,
323 .selector = CT_AE_PRIORITY_CONTROL,
324 .size = 1,
325 .offset = 0,
326 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
327 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
328 },
329 {
330 .id = V4L2_CID_EXPOSURE_ABSOLUTE,
331 .name = "Exposure (Absolute)",
332 .entity = UVC_GUID_UVC_CAMERA,
333 .selector = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
334 .size = 32,
335 .offset = 0,
336 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
337 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
338 },
339 {
340 .id = V4L2_CID_AUTO_WHITE_BALANCE,
341 .name = "White Balance Temperature, Auto",
342 .entity = UVC_GUID_UVC_PROCESSING,
343 .selector = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
344 .size = 1,
345 .offset = 0,
346 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
347 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
348 },
349 {
350 .id = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
351 .name = "White Balance Temperature",
352 .entity = UVC_GUID_UVC_PROCESSING,
353 .selector = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
354 .size = 16,
355 .offset = 0,
356 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
357 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
358 },
359 {
360 .id = V4L2_CID_AUTO_WHITE_BALANCE,
361 .name = "White Balance Component, Auto",
362 .entity = UVC_GUID_UVC_PROCESSING,
363 .selector = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
364 .size = 1,
365 .offset = 0,
366 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
367 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
368 },
369 {
370 .id = V4L2_CID_BLUE_BALANCE,
371 .name = "White Balance Blue Component",
372 .entity = UVC_GUID_UVC_PROCESSING,
373 .selector = PU_WHITE_BALANCE_COMPONENT_CONTROL,
374 .size = 16,
375 .offset = 0,
376 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
377 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
378 },
379 {
380 .id = V4L2_CID_RED_BALANCE,
381 .name = "White Balance Red Component",
382 .entity = UVC_GUID_UVC_PROCESSING,
383 .selector = PU_WHITE_BALANCE_COMPONENT_CONTROL,
384 .size = 16,
385 .offset = 16,
386 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
387 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
388 },
389 {
390 .id = V4L2_CID_FOCUS_ABSOLUTE,
391 .name = "Focus (absolute)",
392 .entity = UVC_GUID_UVC_CAMERA,
393 .selector = CT_FOCUS_ABSOLUTE_CONTROL,
394 .size = 16,
395 .offset = 0,
396 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
397 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
398 },
399 {
400 .id = V4L2_CID_FOCUS_AUTO,
401 .name = "Focus, Auto",
402 .entity = UVC_GUID_UVC_CAMERA,
403 .selector = CT_FOCUS_AUTO_CONTROL,
404 .size = 1,
405 .offset = 0,
406 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
407 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
408 },
409};
410
411/* ------------------------------------------------------------------------
412 * Utility functions
413 */
414
415static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
416{
417 return ctrl->data + id * ctrl->info->size;
418}
419
420static inline int uvc_get_bit(const __u8 *data, int bit)
421{
422 return (data[bit >> 3] >> (bit & 7)) & 1;
423}
424
425/* Extract the bit string specified by mapping->offset and mapping->size
426 * from the little-endian data stored at 'data' and return the result as
427 * a signed 32bit integer. Sign extension will be performed if the mapping
428 * references a signed data type.
429 */
430static __s32 uvc_get_le_value(const __u8 *data,
431 struct uvc_control_mapping *mapping)
432{
433 int bits = mapping->size;
434 int offset = mapping->offset;
435 __s32 value = 0;
436 __u8 mask;
437
438 data += offset / 8;
439 offset &= 7;
440 mask = ((1LL << bits) - 1) << offset;
441
442 for (; bits > 0; data++) {
443 __u8 byte = *data & mask;
444 value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
445 bits -= 8 - (offset > 0 ? offset : 0);
446 offset -= 8;
447 mask = (1 << bits) - 1;
448 }
449
450 /* Sign-extend the value if needed */
451 if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
452 value |= -(value & (1 << (mapping->size - 1)));
453
454 return value;
455}
456
457/* Set the bit string specified by mapping->offset and mapping->size
458 * in the little-endian data stored at 'data' to the value 'value'.
459 */
460static void uvc_set_le_value(__s32 value, __u8 *data,
461 struct uvc_control_mapping *mapping)
462{
463 int bits = mapping->size;
464 int offset = mapping->offset;
465 __u8 mask;
466
467 data += offset / 8;
468 offset &= 7;
469
470 for (; bits > 0; data++) {
471 mask = ((1LL << bits) - 1) << offset;
472 *data = (*data & ~mask) | ((value << offset) & mask);
473 value >>= offset ? offset : 8;
474 bits -= 8 - offset;
475 offset = 0;
476 }
477}
478
479/* ------------------------------------------------------------------------
480 * Terminal and unit management
481 */
482
483static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
484static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
485static const __u8 uvc_media_transport_input_guid[16] =
486 UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
487
488static int uvc_entity_match_guid(struct uvc_entity *entity, __u8 guid[16])
489{
490 switch (UVC_ENTITY_TYPE(entity)) {
491 case ITT_CAMERA:
492 return memcmp(uvc_camera_guid, guid, 16) == 0;
493
494 case ITT_MEDIA_TRANSPORT_INPUT:
495 return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
496
497 case VC_PROCESSING_UNIT:
498 return memcmp(uvc_processing_guid, guid, 16) == 0;
499
500 case VC_EXTENSION_UNIT:
501 return memcmp(entity->extension.guidExtensionCode,
502 guid, 16) == 0;
503
504 default:
505 return 0;
506 }
507}
508
509/* ------------------------------------------------------------------------
510 * UVC Controls
511 */
512
513static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
514 struct uvc_control_mapping **mapping, struct uvc_control **control,
515 int next)
516{
517 struct uvc_control *ctrl;
518 struct uvc_control_mapping *map;
519 unsigned int i;
520
521 if (entity == NULL)
522 return;
523
524 for (i = 0; i < entity->ncontrols; ++i) {
525 ctrl = &entity->controls[i];
526 if (ctrl->info == NULL)
527 continue;
528
529 list_for_each_entry(map, &ctrl->info->mappings, list) {
530 if ((map->id == v4l2_id) && !next) {
531 *control = ctrl;
532 *mapping = map;
533 return;
534 }
535
536 if ((*mapping == NULL || (*mapping)->id > map->id) &&
537 (map->id > v4l2_id) && next) {
538 *control = ctrl;
539 *mapping = map;
540 }
541 }
542 }
543}
544
545struct uvc_control *uvc_find_control(struct uvc_video_device *video,
546 __u32 v4l2_id, struct uvc_control_mapping **mapping)
547{
548 struct uvc_control *ctrl = NULL;
549 struct uvc_entity *entity;
550 int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
551
552 *mapping = NULL;
553
554 /* Mask the query flags. */
555 v4l2_id &= V4L2_CTRL_ID_MASK;
556
557 /* Find the control. */
558 __uvc_find_control(video->processing, v4l2_id, mapping, &ctrl, next);
559 if (ctrl && !next)
560 return ctrl;
561
562 list_for_each_entry(entity, &video->iterms, chain) {
563 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
564 if (ctrl && !next)
565 return ctrl;
566 }
567
568 list_for_each_entry(entity, &video->extensions, chain) {
569 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
570 if (ctrl && !next)
571 return ctrl;
572 }
573
574 if (ctrl == NULL && !next)
575 uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
576 v4l2_id);
577
578 return ctrl;
579}
580
581int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
582 struct v4l2_queryctrl *v4l2_ctrl)
583{
584 struct uvc_control *ctrl;
585 struct uvc_control_mapping *mapping;
586 struct uvc_menu_info *menu;
587 unsigned int i;
588 __u8 data[8];
589 int ret;
590
591 ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping);
592 if (ctrl == NULL)
593 return -EINVAL;
594
595 v4l2_ctrl->id = mapping->id;
596 v4l2_ctrl->type = mapping->v4l2_type;
597 strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
598 v4l2_ctrl->flags = 0;
599
600 if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))
601 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
602
603 if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
604 if ((ret = uvc_query_ctrl(video->dev, GET_DEF, ctrl->entity->id,
605 video->dev->intfnum, ctrl->info->selector,
606 &data, ctrl->info->size)) < 0)
607 return ret;
608 v4l2_ctrl->default_value = uvc_get_le_value(data, mapping);
609 }
610
611 if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
612 v4l2_ctrl->minimum = 0;
613 v4l2_ctrl->maximum = mapping->menu_count - 1;
614 v4l2_ctrl->step = 1;
615
616 menu = mapping->menu_info;
617 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
618 if (menu->value == v4l2_ctrl->default_value) {
619 v4l2_ctrl->default_value = i;
620 break;
621 }
622 }
623
624 return 0;
625 }
626
627 if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
628 if ((ret = uvc_query_ctrl(video->dev, GET_MIN, ctrl->entity->id,
629 video->dev->intfnum, ctrl->info->selector,
630 &data, ctrl->info->size)) < 0)
631 return ret;
632 v4l2_ctrl->minimum = uvc_get_le_value(data, mapping);
633 }
634 if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
635 if ((ret = uvc_query_ctrl(video->dev, GET_MAX, ctrl->entity->id,
636 video->dev->intfnum, ctrl->info->selector,
637 &data, ctrl->info->size)) < 0)
638 return ret;
639 v4l2_ctrl->maximum = uvc_get_le_value(data, mapping);
640 }
641 if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
642 if ((ret = uvc_query_ctrl(video->dev, GET_RES, ctrl->entity->id,
643 video->dev->intfnum, ctrl->info->selector,
644 &data, ctrl->info->size)) < 0)
645 return ret;
646 v4l2_ctrl->step = uvc_get_le_value(data, mapping);
647 }
648
649 return 0;
650}
651
652
653/* --------------------------------------------------------------------------
654 * Control transactions
655 *
656 * To make extended set operations as atomic as the hardware allows, controls
657 * are handled using begin/commit/rollback operations.
658 *
659 * At the beginning of a set request, uvc_ctrl_begin should be called to
660 * initialize the request. This function acquires the control lock.
661 *
662 * When setting a control, the new value is stored in the control data field
663 * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
664 * later processing. If the UVC and V4L2 control sizes differ, the current
665 * value is loaded from the hardware before storing the new value in the data
666 * field.
667 *
668 * After processing all controls in the transaction, uvc_ctrl_commit or
669 * uvc_ctrl_rollback must be called to apply the pending changes to the
670 * hardware or revert them. When applying changes, all controls marked as
671 * dirty will be modified in the UVC device, and the dirty flag will be
672 * cleared. When reverting controls, the control data field
673 * UVC_CTRL_DATA_CURRENT is reverted to its previous value
674 * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
675 * control lock.
676 */
677int uvc_ctrl_begin(struct uvc_video_device *video)
678{
679 return mutex_lock_interruptible(&video->ctrl_mutex) ? -ERESTARTSYS : 0;
680}
681
682static int uvc_ctrl_commit_entity(struct uvc_device *dev,
683 struct uvc_entity *entity, int rollback)
684{
685 struct uvc_control *ctrl;
686 unsigned int i;
687 int ret;
688
689 if (entity == NULL)
690 return 0;
691
692 for (i = 0; i < entity->ncontrols; ++i) {
693 ctrl = &entity->controls[i];
694 if (ctrl->info == NULL || !ctrl->dirty)
695 continue;
696
697 if (!rollback)
698 ret = uvc_query_ctrl(dev, SET_CUR, ctrl->entity->id,
699 dev->intfnum, ctrl->info->selector,
700 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
701 ctrl->info->size);
702 else
703 ret = 0;
704
705 if (rollback || ret < 0)
706 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
707 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
708 ctrl->info->size);
709
710 if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
711 ctrl->loaded = 0;
712
713 ctrl->dirty = 0;
714
715 if (ret < 0)
716 return ret;
717 }
718
719 return 0;
720}
721
722int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback)
723{
724 struct uvc_entity *entity;
725 int ret = 0;
726
727 /* Find the control. */
728 ret = uvc_ctrl_commit_entity(video->dev, video->processing, rollback);
729 if (ret < 0)
730 goto done;
731
732 list_for_each_entry(entity, &video->iterms, chain) {
733 ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
734 if (ret < 0)
735 goto done;
736 }
737
738 list_for_each_entry(entity, &video->extensions, chain) {
739 ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
740 if (ret < 0)
741 goto done;
742 }
743
744done:
745 mutex_unlock(&video->ctrl_mutex);
746 return ret;
747}
748
749int uvc_ctrl_get(struct uvc_video_device *video,
750 struct v4l2_ext_control *xctrl)
751{
752 struct uvc_control *ctrl;
753 struct uvc_control_mapping *mapping;
754 struct uvc_menu_info *menu;
755 unsigned int i;
756 int ret;
757
758 ctrl = uvc_find_control(video, xctrl->id, &mapping);
759 if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
760 return -EINVAL;
761
762 if (!ctrl->loaded) {
763 ret = uvc_query_ctrl(video->dev, GET_CUR, ctrl->entity->id,
764 video->dev->intfnum, ctrl->info->selector,
765 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
766 ctrl->info->size);
767 if (ret < 0)
768 return ret;
769
770 if ((ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE) == 0)
771 ctrl->loaded = 1;
772 }
773
774 xctrl->value = uvc_get_le_value(
775 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping);
776
777 if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
778 menu = mapping->menu_info;
779 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
780 if (menu->value == xctrl->value) {
781 xctrl->value = i;
782 break;
783 }
784 }
785 }
786
787 return 0;
788}
789
790int uvc_ctrl_set(struct uvc_video_device *video,
791 struct v4l2_ext_control *xctrl)
792{
793 struct uvc_control *ctrl;
794 struct uvc_control_mapping *mapping;
795 s32 value = xctrl->value;
796 int ret;
797
798 ctrl = uvc_find_control(video, xctrl->id, &mapping);
799 if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
800 return -EINVAL;
801
802 if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
803 if (value < 0 || value >= mapping->menu_count)
804 return -EINVAL;
805 value = mapping->menu_info[value].value;
806 }
807
808 if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) {
809 if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) {
810 memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
811 0, ctrl->info->size);
812 } else {
813 ret = uvc_query_ctrl(video->dev, GET_CUR,
814 ctrl->entity->id, video->dev->intfnum,
815 ctrl->info->selector,
816 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
817 ctrl->info->size);
818 if (ret < 0)
819 return ret;
820 }
821
822 if ((ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE) == 0)
823 ctrl->loaded = 1;
824 }
825
826 if (!ctrl->dirty) {
827 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
828 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
829 ctrl->info->size);
830 }
831
832 uvc_set_le_value(value,
833 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping);
834
835 ctrl->dirty = 1;
836 ctrl->modified = 1;
837 return 0;
838}
839
840/* --------------------------------------------------------------------------
841 * Dynamic controls
842 */
843
844int uvc_xu_ctrl_query(struct uvc_video_device *video,
845 struct uvc_xu_control *xctrl, int set)
846{
847 struct uvc_entity *entity;
848 struct uvc_control *ctrl = NULL;
849 unsigned int i, found = 0;
850 __u8 *data;
851 int ret;
852
853 /* Find the extension unit. */
854 list_for_each_entry(entity, &video->extensions, chain) {
855 if (entity->id == xctrl->unit)
856 break;
857 }
858
859 if (entity->id != xctrl->unit) {
860 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
861 xctrl->unit);
862 return -EINVAL;
863 }
864
865 /* Find the control. */
866 for (i = 0; i < entity->ncontrols; ++i) {
867 ctrl = &entity->controls[i];
868 if (ctrl->info == NULL)
869 continue;
870
871 if (ctrl->info->selector == xctrl->selector) {
872 found = 1;
873 break;
874 }
875 }
876
877 if (!found) {
878 uvc_trace(UVC_TRACE_CONTROL,
879 "Control " UVC_GUID_FORMAT "/%u not found.\n",
880 UVC_GUID_ARGS(entity->extension.guidExtensionCode),
881 xctrl->selector);
882 return -EINVAL;
883 }
884
885 /* Validate control data size. */
886 if (ctrl->info->size != xctrl->size)
887 return -EINVAL;
888
889 if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) ||
890 (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
891 return -EINVAL;
892
893 if (mutex_lock_interruptible(&video->ctrl_mutex))
894 return -ERESTARTSYS;
895
896 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
897 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
898 xctrl->size);
899 data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
900
901 if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
902 ret = -EFAULT;
903 goto out;
904 }
905
906 ret = uvc_query_ctrl(video->dev, set ? SET_CUR : GET_CUR, xctrl->unit,
907 video->dev->intfnum, xctrl->selector, data,
908 xctrl->size);
909 if (ret < 0)
910 goto out;
911
912 if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
913 ret = -EFAULT;
914 goto out;
915 }
916
917out:
918 if (ret)
919 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
920 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
921 xctrl->size);
922
923 mutex_unlock(&video->ctrl_mutex);
924 return ret;
925}
926
927/* --------------------------------------------------------------------------
928 * Suspend/resume
929 */
930
931/*
932 * Restore control values after resume, skipping controls that haven't been
933 * changed.
934 *
935 * TODO
936 * - Don't restore modified controls that are back to their default value.
937 * - Handle restore order (Auto-Exposure Mode should be restored before
938 * Exposure Time).
939 */
940int uvc_ctrl_resume_device(struct uvc_device *dev)
941{
942 struct uvc_control *ctrl;
943 struct uvc_entity *entity;
944 unsigned int i;
945 int ret;
946
947 /* Walk the entities list and restore controls when possible. */
948 list_for_each_entry(entity, &dev->entities, list) {
949
950 for (i = 0; i < entity->ncontrols; ++i) {
951 ctrl = &entity->controls[i];
952
953 if (ctrl->info == NULL || !ctrl->modified ||
954 (ctrl->info->flags & UVC_CONTROL_RESTORE) == 0)
955 continue;
956
957 printk(KERN_INFO "restoring control " UVC_GUID_FORMAT
958 "/%u/%u\n", UVC_GUID_ARGS(ctrl->info->entity),
959 ctrl->info->index, ctrl->info->selector);
960 ctrl->dirty = 1;
961 }
962
963 ret = uvc_ctrl_commit_entity(dev, entity, 0);
964 if (ret < 0)
965 return ret;
966 }
967
968 return 0;
969}
970
971/* --------------------------------------------------------------------------
972 * Control and mapping handling
973 */
974
975static void uvc_ctrl_add_ctrl(struct uvc_device *dev,
976 struct uvc_control_info *info)
977{
978 struct uvc_entity *entity;
979 struct uvc_control *ctrl = NULL;
980 int ret, found = 0;
981 unsigned int i;
982
983 list_for_each_entry(entity, &dev->entities, list) {
984 if (!uvc_entity_match_guid(entity, info->entity))
985 continue;
986
987 for (i = 0; i < entity->ncontrols; ++i) {
988 ctrl = &entity->controls[i];
989 if (ctrl->index == info->index) {
990 found = 1;
991 break;
992 }
993 }
994
995 if (found)
996 break;
997 }
998
999 if (!found)
1000 return;
1001
1002 if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
1003 /* Check if the device control information and length match
1004 * the user supplied information.
1005 */
1006 __u32 flags;
1007 __le16 size;
1008 __u8 inf;
1009
1010 if ((ret = uvc_query_ctrl(dev, GET_LEN, ctrl->entity->id,
1011 dev->intfnum, info->selector, (__u8 *)&size, 2)) < 0) {
1012 uvc_trace(UVC_TRACE_CONTROL, "GET_LEN failed on "
1013 "control " UVC_GUID_FORMAT "/%u (%d).\n",
1014 UVC_GUID_ARGS(info->entity), info->selector,
1015 ret);
1016 return;
1017 }
1018
1019 if (info->size != le16_to_cpu(size)) {
1020 uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT
1021 "/%u size doesn't match user supplied "
1022 "value.\n", UVC_GUID_ARGS(info->entity),
1023 info->selector);
1024 return;
1025 }
1026
1027 if ((ret = uvc_query_ctrl(dev, GET_INFO, ctrl->entity->id,
1028 dev->intfnum, info->selector, &inf, 1)) < 0) {
1029 uvc_trace(UVC_TRACE_CONTROL, "GET_INFO failed on "
1030 "control " UVC_GUID_FORMAT "/%u (%d).\n",
1031 UVC_GUID_ARGS(info->entity), info->selector,
1032 ret);
1033 return;
1034 }
1035
1036 flags = info->flags;
1037 if (((flags & UVC_CONTROL_GET_CUR) && !(inf & (1 << 0))) ||
1038 ((flags & UVC_CONTROL_SET_CUR) && !(inf & (1 << 1)))) {
1039 uvc_trace(UVC_TRACE_CONTROL, "Control "
1040 UVC_GUID_FORMAT "/%u flags don't match "
1041 "supported operations.\n",
1042 UVC_GUID_ARGS(info->entity), info->selector);
1043 return;
1044 }
1045 }
1046
1047 ctrl->info = info;
1048 ctrl->data = kmalloc(ctrl->info->size * UVC_CTRL_NDATA, GFP_KERNEL);
1049 uvc_trace(UVC_TRACE_CONTROL, "Added control " UVC_GUID_FORMAT "/%u "
1050 "to device %s entity %u\n", UVC_GUID_ARGS(ctrl->info->entity),
1051 ctrl->info->selector, dev->udev->devpath, entity->id);
1052}
1053
1054/*
1055 * Add an item to the UVC control information list, and instantiate a control
1056 * structure for each device that supports the control.
1057 */
1058int uvc_ctrl_add_info(struct uvc_control_info *info)
1059{
1060 struct uvc_control_info *ctrl;
1061 struct uvc_device *dev;
1062 int ret = 0;
1063
1064 /* Find matching controls by walking the devices, entities and
1065 * controls list.
1066 */
1067 mutex_lock(&uvc_driver.ctrl_mutex);
1068
1069 /* First check if the list contains a control matching the new one.
1070 * Bail out if it does.
1071 */
1072 list_for_each_entry(ctrl, &uvc_driver.controls, list) {
1073 if (memcmp(ctrl->entity, info->entity, 16))
1074 continue;
1075
1076 if (ctrl->selector == info->selector) {
1077 uvc_trace(UVC_TRACE_CONTROL, "Control "
1078 UVC_GUID_FORMAT "/%u is already defined.\n",
1079 UVC_GUID_ARGS(info->entity), info->selector);
1080 ret = -EEXIST;
1081 goto end;
1082 }
1083 if (ctrl->index == info->index) {
1084 uvc_trace(UVC_TRACE_CONTROL, "Control "
1085 UVC_GUID_FORMAT "/%u would overwrite index "
1086 "%d.\n", UVC_GUID_ARGS(info->entity),
1087 info->selector, info->index);
1088 ret = -EEXIST;
1089 goto end;
1090 }
1091 }
1092
1093 list_for_each_entry(dev, &uvc_driver.devices, list)
1094 uvc_ctrl_add_ctrl(dev, info);
1095
1096 INIT_LIST_HEAD(&info->mappings);
1097 list_add_tail(&info->list, &uvc_driver.controls);
1098end:
1099 mutex_unlock(&uvc_driver.ctrl_mutex);
1100 return ret;
1101}
1102
1103int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping)
1104{
1105 struct uvc_control_info *info;
1106 struct uvc_control_mapping *map;
1107 int ret = -EINVAL;
1108
1109 if (mapping->id & ~V4L2_CTRL_ID_MASK) {
1110 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s' with "
1111 "invalid control id 0x%08x\n", mapping->name,
1112 mapping->id);
1113 return -EINVAL;
1114 }
1115
1116 mutex_lock(&uvc_driver.ctrl_mutex);
1117 list_for_each_entry(info, &uvc_driver.controls, list) {
1118 if (memcmp(info->entity, mapping->entity, 16) ||
1119 info->selector != mapping->selector)
1120 continue;
1121
1122 if (info->size * 8 < mapping->size + mapping->offset) {
1123 uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' would "
1124 "overflow control " UVC_GUID_FORMAT "/%u\n",
1125 mapping->name, UVC_GUID_ARGS(info->entity),
1126 info->selector);
1127 ret = -EOVERFLOW;
1128 goto end;
1129 }
1130
1131 /* Check if the list contains a mapping matching the new one.
1132 * Bail out if it does.
1133 */
1134 list_for_each_entry(map, &info->mappings, list) {
1135 if (map->id == mapping->id) {
1136 uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' is "
1137 "already defined.\n", mapping->name);
1138 ret = -EEXIST;
1139 goto end;
1140 }
1141 }
1142
1143 mapping->ctrl = info;
1144 list_add_tail(&mapping->list, &info->mappings);
1145 uvc_trace(UVC_TRACE_CONTROL, "Adding mapping %s to control "
1146 UVC_GUID_FORMAT "/%u.\n", mapping->name,
1147 UVC_GUID_ARGS(info->entity), info->selector);
1148
1149 ret = 0;
1150 break;
1151 }
1152end:
1153 mutex_unlock(&uvc_driver.ctrl_mutex);
1154 return ret;
1155}
1156
1157/*
1158 * Initialize device controls.
1159 */
1160int uvc_ctrl_init_device(struct uvc_device *dev)
1161{
1162 struct uvc_control_info *info;
1163 struct uvc_control *ctrl;
1164 struct uvc_entity *entity;
1165 unsigned int i;
1166
1167 /* Walk the entities list and instantiate controls */
1168 list_for_each_entry(entity, &dev->entities, list) {
1169 unsigned int bControlSize = 0, ncontrols = 0;
1170 __u8 *bmControls = NULL;
1171
1172 if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
1173 bmControls = entity->extension.bmControls;
1174 bControlSize = entity->extension.bControlSize;
1175 } else if (UVC_ENTITY_TYPE(entity) == VC_PROCESSING_UNIT) {
1176 bmControls = entity->processing.bmControls;
1177 bControlSize = entity->processing.bControlSize;
1178 } else if (UVC_ENTITY_TYPE(entity) == ITT_CAMERA) {
1179 bmControls = entity->camera.bmControls;
1180 bControlSize = entity->camera.bControlSize;
1181 }
1182
1183 for (i = 0; i < bControlSize; ++i)
1184 ncontrols += hweight8(bmControls[i]);
1185
1186 if (ncontrols == 0)
1187 continue;
1188
1189 entity->controls = kzalloc(ncontrols*sizeof *ctrl, GFP_KERNEL);
1190 if (entity->controls == NULL)
1191 return -ENOMEM;
1192
1193 entity->ncontrols = ncontrols;
1194
1195 ctrl = entity->controls;
1196 for (i = 0; i < bControlSize * 8; ++i) {
1197 if (uvc_get_bit(bmControls, i) == 0)
1198 continue;
1199
1200 ctrl->entity = entity;
1201 ctrl->index = i;
1202 ctrl++;
1203 }
1204 }
1205
1206 /* Walk the controls info list and associate them with the device
1207 * controls, then add the device to the global device list. This has
1208 * to be done while holding the controls lock, to make sure
1209 * uvc_ctrl_add_info() will not get called in-between.
1210 */
1211 mutex_lock(&uvc_driver.ctrl_mutex);
1212 list_for_each_entry(info, &uvc_driver.controls, list)
1213 uvc_ctrl_add_ctrl(dev, info);
1214
1215 list_add_tail(&dev->list, &uvc_driver.devices);
1216 mutex_unlock(&uvc_driver.ctrl_mutex);
1217
1218 return 0;
1219}
1220
1221/*
1222 * Cleanup device controls.
1223 */
1224void uvc_ctrl_cleanup_device(struct uvc_device *dev)
1225{
1226 struct uvc_entity *entity;
1227 unsigned int i;
1228
1229 /* Remove the device from the global devices list */
1230 mutex_lock(&uvc_driver.ctrl_mutex);
1231 if (dev->list.next != NULL)
1232 list_del(&dev->list);
1233 mutex_unlock(&uvc_driver.ctrl_mutex);
1234
1235 list_for_each_entry(entity, &dev->entities, list) {
1236 for (i = 0; i < entity->ncontrols; ++i)
1237 kfree(entity->controls[i].data);
1238
1239 kfree(entity->controls);
1240 }
1241}
1242
1243void uvc_ctrl_init(void)
1244{
1245 struct uvc_control_info *ctrl = uvc_ctrls;
1246 struct uvc_control_info *cend = ctrl + ARRAY_SIZE(uvc_ctrls);
1247 struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
1248 struct uvc_control_mapping *mend =
1249 mapping + ARRAY_SIZE(uvc_ctrl_mappings);
1250
1251 for (; ctrl < cend; ++ctrl)
1252 uvc_ctrl_add_info(ctrl);
1253
1254 for (; mapping < mend; ++mapping)
1255 uvc_ctrl_add_mapping(mapping);
1256}
diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
new file mode 100644
index 000000000000..60ced589f898
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -0,0 +1,1955 @@
1/*
2 * uvc_driver.c -- USB Video Class driver
3 *
4 * Copyright (C) 2005-2008
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14/*
15 * This driver aims to support video input devices compliant with the 'USB
16 * Video Class' specification.
17 *
18 * The driver doesn't support the deprecated v4l1 interface. It implements the
19 * mmap capture method only, and doesn't do any image format conversion in
20 * software. If your user-space application doesn't support YUYV or MJPEG, fix
21 * it :-). Please note that the MJPEG data have been stripped from their
22 * Huffman tables (DHT marker), you will need to add it back if your JPEG
23 * codec can't handle MJPEG data.
24 */
25
26#include <linux/kernel.h>
27#include <linux/version.h>
28#include <linux/list.h>
29#include <linux/module.h>
30#include <linux/usb.h>
31#include <linux/videodev2.h>
32#include <linux/vmalloc.h>
33#include <linux/wait.h>
34#include <asm/atomic.h>
35
36#include <media/v4l2-common.h>
37
38#include "uvcvideo.h"
39
40#define DRIVER_AUTHOR "Laurent Pinchart <laurent.pinchart@skynet.be>"
41#define DRIVER_DESC "USB Video Class driver"
42#ifndef DRIVER_VERSION
43#define DRIVER_VERSION "v0.1.0"
44#endif
45
46static unsigned int uvc_quirks_param;
47unsigned int uvc_trace_param;
48
49/* ------------------------------------------------------------------------
50 * Control, formats, ...
51 */
52
53static struct uvc_format_desc uvc_fmts[] = {
54 {
55 .name = "YUV 4:2:2 (YUYV)",
56 .guid = UVC_GUID_FORMAT_YUY2,
57 .fcc = V4L2_PIX_FMT_YUYV,
58 },
59 {
60 .name = "YUV 4:2:0 (NV12)",
61 .guid = UVC_GUID_FORMAT_NV12,
62 .fcc = V4L2_PIX_FMT_NV12,
63 },
64 {
65 .name = "MJPEG",
66 .guid = UVC_GUID_FORMAT_MJPEG,
67 .fcc = V4L2_PIX_FMT_MJPEG,
68 },
69 {
70 .name = "YVU 4:2:0 (YV12)",
71 .guid = UVC_GUID_FORMAT_YV12,
72 .fcc = V4L2_PIX_FMT_YVU420,
73 },
74 {
75 .name = "YUV 4:2:0 (I420)",
76 .guid = UVC_GUID_FORMAT_I420,
77 .fcc = V4L2_PIX_FMT_YUV420,
78 },
79 {
80 .name = "YUV 4:2:2 (UYVY)",
81 .guid = UVC_GUID_FORMAT_UYVY,
82 .fcc = V4L2_PIX_FMT_UYVY,
83 },
84 {
85 .name = "Greyscale",
86 .guid = UVC_GUID_FORMAT_Y800,
87 .fcc = V4L2_PIX_FMT_GREY,
88 },
89 {
90 .name = "RGB Bayer",
91 .guid = UVC_GUID_FORMAT_BY8,
92 .fcc = V4L2_PIX_FMT_SBGGR8,
93 },
94};
95
96/* ------------------------------------------------------------------------
97 * Utility functions
98 */
99
100struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
101 __u8 epaddr)
102{
103 struct usb_host_endpoint *ep;
104 unsigned int i;
105
106 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
107 ep = &alts->endpoint[i];
108 if (ep->desc.bEndpointAddress == epaddr)
109 return ep;
110 }
111
112 return NULL;
113}
114
115static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
116{
117 unsigned int len = ARRAY_SIZE(uvc_fmts);
118 unsigned int i;
119
120 for (i = 0; i < len; ++i) {
121 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
122 return &uvc_fmts[i];
123 }
124
125 return NULL;
126}
127
128static __u32 uvc_colorspace(const __u8 primaries)
129{
130 static const __u8 colorprimaries[] = {
131 0,
132 V4L2_COLORSPACE_SRGB,
133 V4L2_COLORSPACE_470_SYSTEM_M,
134 V4L2_COLORSPACE_470_SYSTEM_BG,
135 V4L2_COLORSPACE_SMPTE170M,
136 V4L2_COLORSPACE_SMPTE240M,
137 };
138
139 if (primaries < ARRAY_SIZE(colorprimaries))
140 return colorprimaries[primaries];
141
142 return 0;
143}
144
145/* Simplify a fraction using a simple continued fraction decomposition. The
146 * idea here is to convert fractions such as 333333/10000000 to 1/30 using
147 * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
148 * arbitrary parameters to remove non-significative terms from the simple
149 * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
150 * respectively seems to give nice results.
151 */
152void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
153 unsigned int n_terms, unsigned int threshold)
154{
155 uint32_t *an;
156 uint32_t x, y, r;
157 unsigned int i, n;
158
159 an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
160 if (an == NULL)
161 return;
162
163 /* Convert the fraction to a simple continued fraction. See
164 * http://mathforum.org/dr.math/faq/faq.fractions.html
165 * Stop if the current term is bigger than or equal to the given
166 * threshold.
167 */
168 x = *numerator;
169 y = *denominator;
170
171 for (n = 0; n < n_terms && y != 0; ++n) {
172 an[n] = x / y;
173 if (an[n] >= threshold) {
174 if (n < 2)
175 n++;
176 break;
177 }
178
179 r = x - an[n] * y;
180 x = y;
181 y = r;
182 }
183
184 /* Expand the simple continued fraction back to an integer fraction. */
185 x = 0;
186 y = 1;
187
188 for (i = n; i > 0; --i) {
189 r = y;
190 y = an[i-1] * y + x;
191 x = r;
192 }
193
194 *numerator = y;
195 *denominator = x;
196 kfree(an);
197}
198
199/* Convert a fraction to a frame interval in 100ns multiples. The idea here is
200 * to compute numerator / denominator * 10000000 using 32 bit fixed point
201 * arithmetic only.
202 */
203uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
204{
205 uint32_t multiplier;
206
207 /* Saturate the result if the operation would overflow. */
208 if (denominator == 0 ||
209 numerator/denominator >= ((uint32_t)-1)/10000000)
210 return (uint32_t)-1;
211
212 /* Divide both the denominator and the multiplier by two until
213 * numerator * multiplier doesn't overflow. If anyone knows a better
214 * algorithm please let me know.
215 */
216 multiplier = 10000000;
217 while (numerator > ((uint32_t)-1)/multiplier) {
218 multiplier /= 2;
219 denominator /= 2;
220 }
221
222 return denominator ? numerator * multiplier / denominator : 0;
223}
224
225/* ------------------------------------------------------------------------
226 * Terminal and unit management
227 */
228
229static struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
230{
231 struct uvc_entity *entity;
232
233 list_for_each_entry(entity, &dev->entities, list) {
234 if (entity->id == id)
235 return entity;
236 }
237
238 return NULL;
239}
240
241static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
242 int id, struct uvc_entity *entity)
243{
244 unsigned int i;
245
246 if (entity == NULL)
247 entity = list_entry(&dev->entities, struct uvc_entity, list);
248
249 list_for_each_entry_continue(entity, &dev->entities, list) {
250 switch (UVC_ENTITY_TYPE(entity)) {
251 case TT_STREAMING:
252 if (entity->output.bSourceID == id)
253 return entity;
254 break;
255
256 case VC_PROCESSING_UNIT:
257 if (entity->processing.bSourceID == id)
258 return entity;
259 break;
260
261 case VC_SELECTOR_UNIT:
262 for (i = 0; i < entity->selector.bNrInPins; ++i)
263 if (entity->selector.baSourceID[i] == id)
264 return entity;
265 break;
266
267 case VC_EXTENSION_UNIT:
268 for (i = 0; i < entity->extension.bNrInPins; ++i)
269 if (entity->extension.baSourceID[i] == id)
270 return entity;
271 break;
272 }
273 }
274
275 return NULL;
276}
277
278/* ------------------------------------------------------------------------
279 * Descriptors handling
280 */
281
282static int uvc_parse_format(struct uvc_device *dev,
283 struct uvc_streaming *streaming, struct uvc_format *format,
284 __u32 **intervals, unsigned char *buffer, int buflen)
285{
286 struct usb_interface *intf = streaming->intf;
287 struct usb_host_interface *alts = intf->cur_altsetting;
288 struct uvc_format_desc *fmtdesc;
289 struct uvc_frame *frame;
290 const unsigned char *start = buffer;
291 unsigned int interval;
292 unsigned int i, n;
293 __u8 ftype;
294
295 format->type = buffer[2];
296 format->index = buffer[3];
297
298 switch (buffer[2]) {
299 case VS_FORMAT_UNCOMPRESSED:
300 case VS_FORMAT_FRAME_BASED:
301 if (buflen < 27) {
302 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
303 "interface %d FORMAT error\n",
304 dev->udev->devnum,
305 alts->desc.bInterfaceNumber);
306 return -EINVAL;
307 }
308
309 /* Find the format descriptor from its GUID. */
310 fmtdesc = uvc_format_by_guid(&buffer[5]);
311
312 if (fmtdesc != NULL) {
313 strncpy(format->name, fmtdesc->name,
314 sizeof format->name);
315 format->fcc = fmtdesc->fcc;
316 } else {
317 uvc_printk(KERN_INFO, "Unknown video format "
318 UVC_GUID_FORMAT "\n",
319 UVC_GUID_ARGS(&buffer[5]));
320 snprintf(format->name, sizeof format->name,
321 UVC_GUID_FORMAT, UVC_GUID_ARGS(&buffer[5]));
322 format->fcc = 0;
323 }
324
325 format->bpp = buffer[21];
326 if (buffer[2] == VS_FORMAT_UNCOMPRESSED) {
327 ftype = VS_FRAME_UNCOMPRESSED;
328 } else {
329 ftype = VS_FRAME_FRAME_BASED;
330 if (buffer[27])
331 format->flags = UVC_FMT_FLAG_COMPRESSED;
332 }
333 break;
334
335 case VS_FORMAT_MJPEG:
336 if (buflen < 11) {
337 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
338 "interface %d FORMAT error\n",
339 dev->udev->devnum,
340 alts->desc.bInterfaceNumber);
341 return -EINVAL;
342 }
343
344 strncpy(format->name, "MJPEG", sizeof format->name);
345 format->fcc = V4L2_PIX_FMT_MJPEG;
346 format->flags = UVC_FMT_FLAG_COMPRESSED;
347 format->bpp = 0;
348 ftype = VS_FRAME_MJPEG;
349 break;
350
351 case VS_FORMAT_DV:
352 if (buflen < 9) {
353 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
354 "interface %d FORMAT error\n",
355 dev->udev->devnum,
356 alts->desc.bInterfaceNumber);
357 return -EINVAL;
358 }
359
360 switch (buffer[8] & 0x7f) {
361 case 0:
362 strncpy(format->name, "SD-DV", sizeof format->name);
363 break;
364 case 1:
365 strncpy(format->name, "SDL-DV", sizeof format->name);
366 break;
367 case 2:
368 strncpy(format->name, "HD-DV", sizeof format->name);
369 break;
370 default:
371 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
372 "interface %d: unknown DV format %u\n",
373 dev->udev->devnum,
374 alts->desc.bInterfaceNumber, buffer[8]);
375 return -EINVAL;
376 }
377
378 strncat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
379 sizeof format->name);
380
381 format->fcc = V4L2_PIX_FMT_DV;
382 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
383 format->bpp = 0;
384 ftype = 0;
385
386 /* Create a dummy frame descriptor. */
387 frame = &format->frame[0];
388 memset(&format->frame[0], 0, sizeof format->frame[0]);
389 frame->bFrameIntervalType = 1;
390 frame->dwDefaultFrameInterval = 1;
391 frame->dwFrameInterval = *intervals;
392 *(*intervals)++ = 1;
393 format->nframes = 1;
394 break;
395
396 case VS_FORMAT_MPEG2TS:
397 case VS_FORMAT_STREAM_BASED:
398 /* Not supported yet. */
399 default:
400 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
401 "interface %d unsupported format %u\n",
402 dev->udev->devnum, alts->desc.bInterfaceNumber,
403 buffer[2]);
404 return -EINVAL;
405 }
406
407 uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
408
409 buflen -= buffer[0];
410 buffer += buffer[0];
411
412 /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
413 * based formats have frame descriptors.
414 */
415 while (buflen > 2 && buffer[2] == ftype) {
416 frame = &format->frame[format->nframes];
417
418 if (ftype != VS_FRAME_FRAME_BASED)
419 n = buflen > 25 ? buffer[25] : 0;
420 else
421 n = buflen > 21 ? buffer[21] : 0;
422
423 n = n ? n : 3;
424
425 if (buflen < 26 + 4*n) {
426 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
427 "interface %d FRAME error\n", dev->udev->devnum,
428 alts->desc.bInterfaceNumber);
429 return -EINVAL;
430 }
431
432 frame->bFrameIndex = buffer[3];
433 frame->bmCapabilities = buffer[4];
434 frame->wWidth = le16_to_cpup((__le16 *)&buffer[5]);
435 frame->wHeight = le16_to_cpup((__le16 *)&buffer[7]);
436 frame->dwMinBitRate = le32_to_cpup((__le32 *)&buffer[9]);
437 frame->dwMaxBitRate = le32_to_cpup((__le32 *)&buffer[13]);
438 if (ftype != VS_FRAME_FRAME_BASED) {
439 frame->dwMaxVideoFrameBufferSize =
440 le32_to_cpup((__le32 *)&buffer[17]);
441 frame->dwDefaultFrameInterval =
442 le32_to_cpup((__le32 *)&buffer[21]);
443 frame->bFrameIntervalType = buffer[25];
444 } else {
445 frame->dwMaxVideoFrameBufferSize = 0;
446 frame->dwDefaultFrameInterval =
447 le32_to_cpup((__le32 *)&buffer[17]);
448 frame->bFrameIntervalType = buffer[21];
449 }
450 frame->dwFrameInterval = *intervals;
451
452 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
453 * completely. Observed behaviours range from setting the
454 * value to 1.1x the actual frame size of hardwiring the
455 * 16 low bits to 0. This results in a higher than necessary
456 * memory usage as well as a wrong image size information. For
457 * uncompressed formats this can be fixed by computing the
458 * value from the frame size.
459 */
460 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
461 frame->dwMaxVideoFrameBufferSize = format->bpp
462 * frame->wWidth * frame->wHeight / 8;
463
464 /* Some bogus devices report dwMinFrameInterval equal to
465 * dwMaxFrameInterval and have dwFrameIntervalStep set to
466 * zero. Setting all null intervals to 1 fixes the problem and
467 * some other divisions by zero which could happen.
468 */
469 for (i = 0; i < n; ++i) {
470 interval = le32_to_cpup((__le32 *)&buffer[26+4*i]);
471 *(*intervals)++ = interval ? interval : 1;
472 }
473
474 /* Make sure that the default frame interval stays between
475 * the boundaries.
476 */
477 n -= frame->bFrameIntervalType ? 1 : 2;
478 frame->dwDefaultFrameInterval =
479 min(frame->dwFrameInterval[n],
480 max(frame->dwFrameInterval[0],
481 frame->dwDefaultFrameInterval));
482
483 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
484 frame->wWidth, frame->wHeight,
485 10000000/frame->dwDefaultFrameInterval,
486 (100000000/frame->dwDefaultFrameInterval)%10);
487
488 format->nframes++;
489 buflen -= buffer[0];
490 buffer += buffer[0];
491 }
492
493 if (buflen > 2 && buffer[2] == VS_STILL_IMAGE_FRAME) {
494 buflen -= buffer[0];
495 buffer += buffer[0];
496 }
497
498 if (buflen > 2 && buffer[2] == VS_COLORFORMAT) {
499 if (buflen < 6) {
500 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
501 "interface %d COLORFORMAT error\n",
502 dev->udev->devnum,
503 alts->desc.bInterfaceNumber);
504 return -EINVAL;
505 }
506
507 format->colorspace = uvc_colorspace(buffer[3]);
508
509 buflen -= buffer[0];
510 buffer += buffer[0];
511 }
512
513 return buffer - start;
514}
515
516static int uvc_parse_streaming(struct uvc_device *dev,
517 struct usb_interface *intf)
518{
519 struct uvc_streaming *streaming = NULL;
520 struct uvc_format *format;
521 struct uvc_frame *frame;
522 struct usb_host_interface *alts = &intf->altsetting[0];
523 unsigned char *_buffer, *buffer = alts->extra;
524 int _buflen, buflen = alts->extralen;
525 unsigned int nformats = 0, nframes = 0, nintervals = 0;
526 unsigned int size, i, n, p;
527 __u32 *interval;
528 __u16 psize;
529 int ret = -EINVAL;
530
531 if (intf->cur_altsetting->desc.bInterfaceSubClass
532 != SC_VIDEOSTREAMING) {
533 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
534 "video streaming interface\n", dev->udev->devnum,
535 intf->altsetting[0].desc.bInterfaceNumber);
536 return -EINVAL;
537 }
538
539 if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
540 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
541 "claimed\n", dev->udev->devnum,
542 intf->altsetting[0].desc.bInterfaceNumber);
543 return -EINVAL;
544 }
545
546 streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
547 if (streaming == NULL) {
548 usb_driver_release_interface(&uvc_driver.driver, intf);
549 return -EINVAL;
550 }
551
552 mutex_init(&streaming->mutex);
553 streaming->intf = usb_get_intf(intf);
554 streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
555
556 /* The Pico iMage webcam has its class-specific interface descriptors
557 * after the endpoint descriptors.
558 */
559 if (buflen == 0) {
560 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
561 struct usb_host_endpoint *ep = &alts->endpoint[i];
562
563 if (ep->extralen == 0)
564 continue;
565
566 if (ep->extralen > 2 &&
567 ep->extra[1] == USB_DT_CS_INTERFACE) {
568 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
569 "from endpoint %u.\n", i);
570 buffer = alts->endpoint[i].extra;
571 buflen = alts->endpoint[i].extralen;
572 break;
573 }
574 }
575 }
576
577 /* Skip the standard interface descriptors. */
578 while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
579 buflen -= buffer[0];
580 buffer += buffer[0];
581 }
582
583 if (buflen <= 2) {
584 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
585 "interface descriptors found.\n");
586 goto error;
587 }
588
589 /* Parse the header descriptor. */
590 if (buffer[2] == VS_OUTPUT_HEADER) {
591 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
592 "%d OUTPUT HEADER descriptor is not supported.\n",
593 dev->udev->devnum, alts->desc.bInterfaceNumber);
594 goto error;
595 } else if (buffer[2] == VS_INPUT_HEADER) {
596 p = buflen >= 5 ? buffer[3] : 0;
597 n = buflen >= 12 ? buffer[12] : 0;
598
599 if (buflen < 13 + p*n || buffer[2] != VS_INPUT_HEADER) {
600 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
601 "interface %d INPUT HEADER descriptor is "
602 "invalid.\n", dev->udev->devnum,
603 alts->desc.bInterfaceNumber);
604 goto error;
605 }
606
607 streaming->header.bNumFormats = p;
608 streaming->header.bEndpointAddress = buffer[6];
609 streaming->header.bmInfo = buffer[7];
610 streaming->header.bTerminalLink = buffer[8];
611 streaming->header.bStillCaptureMethod = buffer[9];
612 streaming->header.bTriggerSupport = buffer[10];
613 streaming->header.bTriggerUsage = buffer[11];
614 streaming->header.bControlSize = n;
615
616 streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
617 if (streaming->header.bmaControls == NULL) {
618 ret = -ENOMEM;
619 goto error;
620 }
621
622 memcpy(streaming->header.bmaControls, &buffer[13], p*n);
623 } else {
624 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
625 "%d HEADER descriptor not found.\n", dev->udev->devnum,
626 alts->desc.bInterfaceNumber);
627 goto error;
628 }
629
630 buflen -= buffer[0];
631 buffer += buffer[0];
632
633 _buffer = buffer;
634 _buflen = buflen;
635
636 /* Count the format and frame descriptors. */
637 while (_buflen > 2) {
638 switch (_buffer[2]) {
639 case VS_FORMAT_UNCOMPRESSED:
640 case VS_FORMAT_MJPEG:
641 case VS_FORMAT_FRAME_BASED:
642 nformats++;
643 break;
644
645 case VS_FORMAT_DV:
646 /* DV format has no frame descriptor. We will create a
647 * dummy frame descriptor with a dummy frame interval.
648 */
649 nformats++;
650 nframes++;
651 nintervals++;
652 break;
653
654 case VS_FORMAT_MPEG2TS:
655 case VS_FORMAT_STREAM_BASED:
656 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
657 "interface %d FORMAT %u is not supported.\n",
658 dev->udev->devnum,
659 alts->desc.bInterfaceNumber, _buffer[2]);
660 break;
661
662 case VS_FRAME_UNCOMPRESSED:
663 case VS_FRAME_MJPEG:
664 nframes++;
665 if (_buflen > 25)
666 nintervals += _buffer[25] ? _buffer[25] : 3;
667 break;
668
669 case VS_FRAME_FRAME_BASED:
670 nframes++;
671 if (_buflen > 21)
672 nintervals += _buffer[21] ? _buffer[21] : 3;
673 break;
674 }
675
676 _buflen -= _buffer[0];
677 _buffer += _buffer[0];
678 }
679
680 if (nformats == 0) {
681 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
682 "%d has no supported formats defined.\n",
683 dev->udev->devnum, alts->desc.bInterfaceNumber);
684 goto error;
685 }
686
687 size = nformats * sizeof *format + nframes * sizeof *frame
688 + nintervals * sizeof *interval;
689 format = kzalloc(size, GFP_KERNEL);
690 if (format == NULL) {
691 ret = -ENOMEM;
692 goto error;
693 }
694
695 frame = (struct uvc_frame *)&format[nformats];
696 interval = (__u32 *)&frame[nframes];
697
698 streaming->format = format;
699 streaming->nformats = nformats;
700
701 /* Parse the format descriptors. */
702 while (buflen > 2) {
703 switch (buffer[2]) {
704 case VS_FORMAT_UNCOMPRESSED:
705 case VS_FORMAT_MJPEG:
706 case VS_FORMAT_DV:
707 case VS_FORMAT_FRAME_BASED:
708 format->frame = frame;
709 ret = uvc_parse_format(dev, streaming, format,
710 &interval, buffer, buflen);
711 if (ret < 0)
712 goto error;
713
714 frame += format->nframes;
715 format++;
716
717 buflen -= ret;
718 buffer += ret;
719 continue;
720
721 default:
722 break;
723 }
724
725 buflen -= buffer[0];
726 buffer += buffer[0];
727 }
728
729 /* Parse the alternate settings to find the maximum bandwidth. */
730 for (i = 0; i < intf->num_altsetting; ++i) {
731 struct usb_host_endpoint *ep;
732 alts = &intf->altsetting[i];
733 ep = uvc_find_endpoint(alts,
734 streaming->header.bEndpointAddress);
735 if (ep == NULL)
736 continue;
737
738 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
739 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
740 if (psize > streaming->maxpsize)
741 streaming->maxpsize = psize;
742 }
743
744 list_add_tail(&streaming->list, &dev->streaming);
745 return 0;
746
747error:
748 usb_driver_release_interface(&uvc_driver.driver, intf);
749 usb_put_intf(intf);
750 kfree(streaming->format);
751 kfree(streaming->header.bmaControls);
752 kfree(streaming);
753 return ret;
754}
755
756/* Parse vendor-specific extensions. */
757static int uvc_parse_vendor_control(struct uvc_device *dev,
758 const unsigned char *buffer, int buflen)
759{
760 struct usb_device *udev = dev->udev;
761 struct usb_host_interface *alts = dev->intf->cur_altsetting;
762 struct uvc_entity *unit;
763 unsigned int n, p;
764 int handled = 0;
765
766 switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
767 case 0x046d: /* Logitech */
768 if (buffer[1] != 0x41 || buffer[2] != 0x01)
769 break;
770
771 /* Logitech implements several vendor specific functions
772 * through vendor specific extension units (LXU).
773 *
774 * The LXU descriptors are similar to XU descriptors
775 * (see "USB Device Video Class for Video Devices", section
776 * 3.7.2.6 "Extension Unit Descriptor") with the following
777 * differences:
778 *
779 * ----------------------------------------------------------
780 * 0 bLength 1 Number
781 * Size of this descriptor, in bytes: 24+p+n*2
782 * ----------------------------------------------------------
783 * 23+p+n bmControlsType N Bitmap
784 * Individual bits in the set are defined:
785 * 0: Absolute
786 * 1: Relative
787 *
788 * This bitset is mapped exactly the same as bmControls.
789 * ----------------------------------------------------------
790 * 23+p+n*2 bReserved 1 Boolean
791 * ----------------------------------------------------------
792 * 24+p+n*2 iExtension 1 Index
793 * Index of a string descriptor that describes this
794 * extension unit.
795 * ----------------------------------------------------------
796 */
797 p = buflen >= 22 ? buffer[21] : 0;
798 n = buflen >= 25 + p ? buffer[22+p] : 0;
799
800 if (buflen < 25 + p + 2*n) {
801 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
802 "interface %d EXTENSION_UNIT error\n",
803 udev->devnum, alts->desc.bInterfaceNumber);
804 break;
805 }
806
807 unit = kzalloc(sizeof *unit + p + 2*n, GFP_KERNEL);
808 if (unit == NULL)
809 return -ENOMEM;
810
811 unit->id = buffer[3];
812 unit->type = VC_EXTENSION_UNIT;
813 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
814 unit->extension.bNumControls = buffer[20];
815 unit->extension.bNrInPins =
816 le16_to_cpup((__le16 *)&buffer[21]);
817 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
818 memcpy(unit->extension.baSourceID, &buffer[22], p);
819 unit->extension.bControlSize = buffer[22+p];
820 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
821 unit->extension.bmControlsType = (__u8 *)unit + sizeof *unit
822 + p + n;
823 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
824
825 if (buffer[24+p+2*n] != 0)
826 usb_string(udev, buffer[24+p+2*n], unit->name,
827 sizeof unit->name);
828 else
829 sprintf(unit->name, "Extension %u", buffer[3]);
830
831 list_add_tail(&unit->list, &dev->entities);
832 handled = 1;
833 break;
834 }
835
836 return handled;
837}
838
839static int uvc_parse_standard_control(struct uvc_device *dev,
840 const unsigned char *buffer, int buflen)
841{
842 struct usb_device *udev = dev->udev;
843 struct uvc_entity *unit, *term;
844 struct usb_interface *intf;
845 struct usb_host_interface *alts = dev->intf->cur_altsetting;
846 unsigned int i, n, p, len;
847 __u16 type;
848
849 switch (buffer[2]) {
850 case VC_HEADER:
851 n = buflen >= 12 ? buffer[11] : 0;
852
853 if (buflen < 12 || buflen < 12 + n) {
854 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
855 "interface %d HEADER error\n", udev->devnum,
856 alts->desc.bInterfaceNumber);
857 return -EINVAL;
858 }
859
860 dev->uvc_version = le16_to_cpup((__le16 *)&buffer[3]);
861 dev->clock_frequency = le32_to_cpup((__le32 *)&buffer[7]);
862
863 /* Parse all USB Video Streaming interfaces. */
864 for (i = 0; i < n; ++i) {
865 intf = usb_ifnum_to_if(udev, buffer[12+i]);
866 if (intf == NULL) {
867 uvc_trace(UVC_TRACE_DESCR, "device %d "
868 "interface %d doesn't exists\n",
869 udev->devnum, i);
870 continue;
871 }
872
873 uvc_parse_streaming(dev, intf);
874 }
875 break;
876
877 case VC_INPUT_TERMINAL:
878 if (buflen < 8) {
879 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
880 "interface %d INPUT_TERMINAL error\n",
881 udev->devnum, alts->desc.bInterfaceNumber);
882 return -EINVAL;
883 }
884
885 /* Make sure the terminal type MSB is not null, otherwise it
886 * could be confused with a unit.
887 */
888 type = le16_to_cpup((__le16 *)&buffer[4]);
889 if ((type & 0xff00) == 0) {
890 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
891 "interface %d INPUT_TERMINAL %d has invalid "
892 "type 0x%04x, skipping\n", udev->devnum,
893 alts->desc.bInterfaceNumber,
894 buffer[3], type);
895 return 0;
896 }
897
898 n = 0;
899 p = 0;
900 len = 8;
901
902 if (type == ITT_CAMERA) {
903 n = buflen >= 15 ? buffer[14] : 0;
904 len = 15;
905
906 } else if (type == ITT_MEDIA_TRANSPORT_INPUT) {
907 n = buflen >= 9 ? buffer[8] : 0;
908 p = buflen >= 10 + n ? buffer[9+n] : 0;
909 len = 10;
910 }
911
912 if (buflen < len + n + p) {
913 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
914 "interface %d INPUT_TERMINAL error\n",
915 udev->devnum, alts->desc.bInterfaceNumber);
916 return -EINVAL;
917 }
918
919 term = kzalloc(sizeof *term + n + p, GFP_KERNEL);
920 if (term == NULL)
921 return -ENOMEM;
922
923 term->id = buffer[3];
924 term->type = type | UVC_TERM_INPUT;
925
926 if (UVC_ENTITY_TYPE(term) == ITT_CAMERA) {
927 term->camera.bControlSize = n;
928 term->camera.bmControls = (__u8 *)term + sizeof *term;
929 term->camera.wObjectiveFocalLengthMin =
930 le16_to_cpup((__le16 *)&buffer[8]);
931 term->camera.wObjectiveFocalLengthMax =
932 le16_to_cpup((__le16 *)&buffer[10]);
933 term->camera.wOcularFocalLength =
934 le16_to_cpup((__le16 *)&buffer[12]);
935 memcpy(term->camera.bmControls, &buffer[15], n);
936 } else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT) {
937 term->media.bControlSize = n;
938 term->media.bmControls = (__u8 *)term + sizeof *term;
939 term->media.bTransportModeSize = p;
940 term->media.bmTransportModes = (__u8 *)term
941 + sizeof *term + n;
942 memcpy(term->media.bmControls, &buffer[9], n);
943 memcpy(term->media.bmTransportModes, &buffer[10+n], p);
944 }
945
946 if (buffer[7] != 0)
947 usb_string(udev, buffer[7], term->name,
948 sizeof term->name);
949 else if (UVC_ENTITY_TYPE(term) == ITT_CAMERA)
950 sprintf(term->name, "Camera %u", buffer[3]);
951 else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT)
952 sprintf(term->name, "Media %u", buffer[3]);
953 else
954 sprintf(term->name, "Input %u", buffer[3]);
955
956 list_add_tail(&term->list, &dev->entities);
957 break;
958
959 case VC_OUTPUT_TERMINAL:
960 if (buflen < 9) {
961 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
962 "interface %d OUTPUT_TERMINAL error\n",
963 udev->devnum, alts->desc.bInterfaceNumber);
964 return -EINVAL;
965 }
966
967 /* Make sure the terminal type MSB is not null, otherwise it
968 * could be confused with a unit.
969 */
970 type = le16_to_cpup((__le16 *)&buffer[4]);
971 if ((type & 0xff00) == 0) {
972 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
973 "interface %d OUTPUT_TERMINAL %d has invalid "
974 "type 0x%04x, skipping\n", udev->devnum,
975 alts->desc.bInterfaceNumber, buffer[3], type);
976 return 0;
977 }
978
979 term = kzalloc(sizeof *term, GFP_KERNEL);
980 if (term == NULL)
981 return -ENOMEM;
982
983 term->id = buffer[3];
984 term->type = type | UVC_TERM_OUTPUT;
985 term->output.bSourceID = buffer[7];
986
987 if (buffer[8] != 0)
988 usb_string(udev, buffer[8], term->name,
989 sizeof term->name);
990 else
991 sprintf(term->name, "Output %u", buffer[3]);
992
993 list_add_tail(&term->list, &dev->entities);
994 break;
995
996 case VC_SELECTOR_UNIT:
997 p = buflen >= 5 ? buffer[4] : 0;
998
999 if (buflen < 5 || buflen < 6 + p) {
1000 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1001 "interface %d SELECTOR_UNIT error\n",
1002 udev->devnum, alts->desc.bInterfaceNumber);
1003 return -EINVAL;
1004 }
1005
1006 unit = kzalloc(sizeof *unit + p, GFP_KERNEL);
1007 if (unit == NULL)
1008 return -ENOMEM;
1009
1010 unit->id = buffer[3];
1011 unit->type = buffer[2];
1012 unit->selector.bNrInPins = buffer[4];
1013 unit->selector.baSourceID = (__u8 *)unit + sizeof *unit;
1014 memcpy(unit->selector.baSourceID, &buffer[5], p);
1015
1016 if (buffer[5+p] != 0)
1017 usb_string(udev, buffer[5+p], unit->name,
1018 sizeof unit->name);
1019 else
1020 sprintf(unit->name, "Selector %u", buffer[3]);
1021
1022 list_add_tail(&unit->list, &dev->entities);
1023 break;
1024
1025 case VC_PROCESSING_UNIT:
1026 n = buflen >= 8 ? buffer[7] : 0;
1027 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1028
1029 if (buflen < p + n) {
1030 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1031 "interface %d PROCESSING_UNIT error\n",
1032 udev->devnum, alts->desc.bInterfaceNumber);
1033 return -EINVAL;
1034 }
1035
1036 unit = kzalloc(sizeof *unit + n, GFP_KERNEL);
1037 if (unit == NULL)
1038 return -ENOMEM;
1039
1040 unit->id = buffer[3];
1041 unit->type = buffer[2];
1042 unit->processing.bSourceID = buffer[4];
1043 unit->processing.wMaxMultiplier =
1044 le16_to_cpup((__le16 *)&buffer[5]);
1045 unit->processing.bControlSize = buffer[7];
1046 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1047 memcpy(unit->processing.bmControls, &buffer[8], n);
1048 if (dev->uvc_version >= 0x0110)
1049 unit->processing.bmVideoStandards = buffer[9+n];
1050
1051 if (buffer[8+n] != 0)
1052 usb_string(udev, buffer[8+n], unit->name,
1053 sizeof unit->name);
1054 else
1055 sprintf(unit->name, "Processing %u", buffer[3]);
1056
1057 list_add_tail(&unit->list, &dev->entities);
1058 break;
1059
1060 case VC_EXTENSION_UNIT:
1061 p = buflen >= 22 ? buffer[21] : 0;
1062 n = buflen >= 24 + p ? buffer[22+p] : 0;
1063
1064 if (buflen < 24 + p + n) {
1065 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1066 "interface %d EXTENSION_UNIT error\n",
1067 udev->devnum, alts->desc.bInterfaceNumber);
1068 return -EINVAL;
1069 }
1070
1071 unit = kzalloc(sizeof *unit + p + n, GFP_KERNEL);
1072 if (unit == NULL)
1073 return -ENOMEM;
1074
1075 unit->id = buffer[3];
1076 unit->type = buffer[2];
1077 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1078 unit->extension.bNumControls = buffer[20];
1079 unit->extension.bNrInPins =
1080 le16_to_cpup((__le16 *)&buffer[21]);
1081 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
1082 memcpy(unit->extension.baSourceID, &buffer[22], p);
1083 unit->extension.bControlSize = buffer[22+p];
1084 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
1085 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1086
1087 if (buffer[23+p+n] != 0)
1088 usb_string(udev, buffer[23+p+n], unit->name,
1089 sizeof unit->name);
1090 else
1091 sprintf(unit->name, "Extension %u", buffer[3]);
1092
1093 list_add_tail(&unit->list, &dev->entities);
1094 break;
1095
1096 default:
1097 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1098 "descriptor (%u)\n", buffer[2]);
1099 break;
1100 }
1101
1102 return 0;
1103}
1104
1105static int uvc_parse_control(struct uvc_device *dev)
1106{
1107 struct usb_host_interface *alts = dev->intf->cur_altsetting;
1108 unsigned char *buffer = alts->extra;
1109 int buflen = alts->extralen;
1110 int ret;
1111
1112 /* Parse the default alternate setting only, as the UVC specification
1113 * defines a single alternate setting, the default alternate setting
1114 * zero.
1115 */
1116
1117 while (buflen > 2) {
1118 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1119 buffer[1] != USB_DT_CS_INTERFACE)
1120 goto next_descriptor;
1121
1122 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1123 return ret;
1124
1125next_descriptor:
1126 buflen -= buffer[0];
1127 buffer += buffer[0];
1128 }
1129
1130 /* Check if the optional status endpoint is present. */
1131 if (alts->desc.bNumEndpoints == 1) {
1132 struct usb_host_endpoint *ep = &alts->endpoint[0];
1133 struct usb_endpoint_descriptor *desc = &ep->desc;
1134
1135 if (usb_endpoint_is_int_in(desc) &&
1136 le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1137 desc->bInterval != 0) {
1138 uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1139 "(addr %02x).\n", desc->bEndpointAddress);
1140 dev->int_ep = ep;
1141 }
1142 }
1143
1144 return 0;
1145}
1146
1147/* ------------------------------------------------------------------------
1148 * USB probe and disconnect
1149 */
1150
1151/*
1152 * Unregister the video devices.
1153 */
1154static void uvc_unregister_video(struct uvc_device *dev)
1155{
1156 if (dev->video.vdev) {
1157 if (dev->video.vdev->minor == -1)
1158 video_device_release(dev->video.vdev);
1159 else
1160 video_unregister_device(dev->video.vdev);
1161 dev->video.vdev = NULL;
1162 }
1163}
1164
1165/*
1166 * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1167 * and containing the following units:
1168 *
1169 * - a USB Streaming Output Terminal
1170 * - zero or one Processing Unit
1171 * - zero, one or mode single-input Selector Units
1172 * - zero or one multiple-input Selector Units, provided all inputs are
1173 * connected to input terminals
1174 * - zero, one or mode single-input Extension Units
1175 * - one Camera Input Terminal, or one or more External terminals.
1176 *
1177 * A side forward scan is made on each detected entity to check for additional
1178 * extension units.
1179 */
1180static int uvc_scan_chain_entity(struct uvc_video_device *video,
1181 struct uvc_entity *entity)
1182{
1183 switch (UVC_ENTITY_TYPE(entity)) {
1184 case VC_EXTENSION_UNIT:
1185 if (uvc_trace_param & UVC_TRACE_PROBE)
1186 printk(" <- XU %d", entity->id);
1187
1188 if (entity->extension.bNrInPins != 1) {
1189 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1190 "than 1 input pin.\n", entity->id);
1191 return -1;
1192 }
1193
1194 list_add_tail(&entity->chain, &video->extensions);
1195 break;
1196
1197 case VC_PROCESSING_UNIT:
1198 if (uvc_trace_param & UVC_TRACE_PROBE)
1199 printk(" <- PU %d", entity->id);
1200
1201 if (video->processing != NULL) {
1202 uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1203 "Processing Units in chain.\n");
1204 return -1;
1205 }
1206
1207 video->processing = entity;
1208 break;
1209
1210 case VC_SELECTOR_UNIT:
1211 if (uvc_trace_param & UVC_TRACE_PROBE)
1212 printk(" <- SU %d", entity->id);
1213
1214 /* Single-input selector units are ignored. */
1215 if (entity->selector.bNrInPins == 1)
1216 break;
1217
1218 if (video->selector != NULL) {
1219 uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1220 "Units in chain.\n");
1221 return -1;
1222 }
1223
1224 video->selector = entity;
1225 break;
1226
1227 case ITT_VENDOR_SPECIFIC:
1228 case ITT_CAMERA:
1229 case ITT_MEDIA_TRANSPORT_INPUT:
1230 if (uvc_trace_param & UVC_TRACE_PROBE)
1231 printk(" <- IT %d\n", entity->id);
1232
1233 list_add_tail(&entity->chain, &video->iterms);
1234 break;
1235
1236 default:
1237 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1238 "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1239 return -1;
1240 }
1241
1242 return 0;
1243}
1244
1245static int uvc_scan_chain_forward(struct uvc_video_device *video,
1246 struct uvc_entity *entity, struct uvc_entity *prev)
1247{
1248 struct uvc_entity *forward;
1249 int found;
1250
1251 /* Forward scan */
1252 forward = NULL;
1253 found = 0;
1254
1255 while (1) {
1256 forward = uvc_entity_by_reference(video->dev, entity->id,
1257 forward);
1258 if (forward == NULL)
1259 break;
1260
1261 if (UVC_ENTITY_TYPE(forward) != VC_EXTENSION_UNIT ||
1262 forward == prev)
1263 continue;
1264
1265 if (forward->extension.bNrInPins != 1) {
1266 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has"
1267 "more than 1 input pin.\n", entity->id);
1268 return -1;
1269 }
1270
1271 list_add_tail(&forward->chain, &video->extensions);
1272 if (uvc_trace_param & UVC_TRACE_PROBE) {
1273 if (!found)
1274 printk(" (-> XU");
1275
1276 printk(" %d", forward->id);
1277 found = 1;
1278 }
1279 }
1280 if (found)
1281 printk(")");
1282
1283 return 0;
1284}
1285
1286static int uvc_scan_chain_backward(struct uvc_video_device *video,
1287 struct uvc_entity *entity)
1288{
1289 struct uvc_entity *term;
1290 int id = -1, i;
1291
1292 switch (UVC_ENTITY_TYPE(entity)) {
1293 case VC_EXTENSION_UNIT:
1294 id = entity->extension.baSourceID[0];
1295 break;
1296
1297 case VC_PROCESSING_UNIT:
1298 id = entity->processing.bSourceID;
1299 break;
1300
1301 case VC_SELECTOR_UNIT:
1302 /* Single-input selector units are ignored. */
1303 if (entity->selector.bNrInPins == 1) {
1304 id = entity->selector.baSourceID[0];
1305 break;
1306 }
1307
1308 if (uvc_trace_param & UVC_TRACE_PROBE)
1309 printk(" <- IT");
1310
1311 video->selector = entity;
1312 for (i = 0; i < entity->selector.bNrInPins; ++i) {
1313 id = entity->selector.baSourceID[i];
1314 term = uvc_entity_by_id(video->dev, id);
1315 if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1316 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1317 "input %d isn't connected to an "
1318 "input terminal\n", entity->id, i);
1319 return -1;
1320 }
1321
1322 if (uvc_trace_param & UVC_TRACE_PROBE)
1323 printk(" %d", term->id);
1324
1325 list_add_tail(&term->chain, &video->iterms);
1326 uvc_scan_chain_forward(video, term, entity);
1327 }
1328
1329 if (uvc_trace_param & UVC_TRACE_PROBE)
1330 printk("\n");
1331
1332 id = 0;
1333 break;
1334 }
1335
1336 return id;
1337}
1338
1339static int uvc_scan_chain(struct uvc_video_device *video)
1340{
1341 struct uvc_entity *entity, *prev;
1342 int id;
1343
1344 entity = video->oterm;
1345 uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
1346 id = entity->output.bSourceID;
1347 while (id != 0) {
1348 prev = entity;
1349 entity = uvc_entity_by_id(video->dev, id);
1350 if (entity == NULL) {
1351 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1352 "unknown entity %d.\n", id);
1353 return -1;
1354 }
1355
1356 /* Process entity */
1357 if (uvc_scan_chain_entity(video, entity) < 0)
1358 return -1;
1359
1360 /* Forward scan */
1361 if (uvc_scan_chain_forward(video, entity, prev) < 0)
1362 return -1;
1363
1364 /* Stop when a terminal is found. */
1365 if (!UVC_ENTITY_IS_UNIT(entity))
1366 break;
1367
1368 /* Backward scan */
1369 id = uvc_scan_chain_backward(video, entity);
1370 if (id < 0)
1371 return id;
1372 }
1373
1374 /* Initialize the video buffers queue. */
1375 uvc_queue_init(&video->queue);
1376
1377 return 0;
1378}
1379
1380/*
1381 * Register the video devices.
1382 *
1383 * The driver currently supports a single video device per control interface
1384 * only. The terminal and units must match the following structure:
1385 *
1386 * ITT_CAMERA -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
1387 *
1388 * The Extension Units, if present, must have a single input pin. The
1389 * Processing Unit and Extension Units can be in any order. Additional
1390 * Extension Units connected to the main chain as single-unit branches are
1391 * also supported.
1392 */
1393static int uvc_register_video(struct uvc_device *dev)
1394{
1395 struct video_device *vdev;
1396 struct uvc_entity *term;
1397 int found = 0, ret;
1398
1399 /* Check if the control interface matches the structure we expect. */
1400 list_for_each_entry(term, &dev->entities, list) {
1401 struct uvc_streaming *streaming;
1402
1403 if (UVC_ENTITY_TYPE(term) != TT_STREAMING)
1404 continue;
1405
1406 memset(&dev->video, 0, sizeof dev->video);
1407 mutex_init(&dev->video.ctrl_mutex);
1408 INIT_LIST_HEAD(&dev->video.iterms);
1409 INIT_LIST_HEAD(&dev->video.extensions);
1410 dev->video.oterm = term;
1411 dev->video.dev = dev;
1412 if (uvc_scan_chain(&dev->video) < 0)
1413 continue;
1414
1415 list_for_each_entry(streaming, &dev->streaming, list) {
1416 if (streaming->header.bTerminalLink == term->id) {
1417 dev->video.streaming = streaming;
1418 found = 1;
1419 break;
1420 }
1421 }
1422
1423 if (found)
1424 break;
1425 }
1426
1427 if (!found) {
1428 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1429 return -1;
1430 }
1431
1432 if (uvc_trace_param & UVC_TRACE_PROBE) {
1433 uvc_printk(KERN_INFO, "Found a valid video chain (");
1434 list_for_each_entry(term, &dev->video.iterms, chain) {
1435 printk("%d", term->id);
1436 if (term->chain.next != &dev->video.iterms)
1437 printk(",");
1438 }
1439 printk(" -> %d).\n", dev->video.oterm->id);
1440 }
1441
1442 /* Initialize the streaming interface with default streaming
1443 * parameters.
1444 */
1445 if ((ret = uvc_video_init(&dev->video)) < 0) {
1446 uvc_printk(KERN_ERR, "Failed to initialize the device "
1447 "(%d).\n", ret);
1448 return ret;
1449 }
1450
1451 /* Register the device with V4L. */
1452 vdev = video_device_alloc();
1453 if (vdev == NULL)
1454 return -1;
1455
1456 /* We already hold a reference to dev->udev. The video device will be
1457 * unregistered before the reference is released, so we don't need to
1458 * get another one.
1459 */
1460 vdev->dev = &dev->intf->dev;
1461 vdev->type = 0;
1462 vdev->type2 = 0;
1463 vdev->minor = -1;
1464 vdev->fops = &uvc_fops;
1465 vdev->release = video_device_release;
1466 strncpy(vdev->name, dev->name, sizeof vdev->name);
1467
1468 /* Set the driver data before calling video_register_device, otherwise
1469 * uvc_v4l2_open might race us.
1470 *
1471 * FIXME: usb_set_intfdata hasn't been called so far. Is that a
1472 * problem ? Does any function which could be called here get
1473 * a pointer to the usb_interface ?
1474 */
1475 dev->video.vdev = vdev;
1476 video_set_drvdata(vdev, &dev->video);
1477
1478 if (video_register_device(vdev, VFL_TYPE_GRABBER, -1) < 0) {
1479 dev->video.vdev = NULL;
1480 video_device_release(vdev);
1481 return -1;
1482 }
1483
1484 return 0;
1485}
1486
1487/*
1488 * Delete the UVC device.
1489 *
1490 * Called by the kernel when the last reference to the uvc_device structure
1491 * is released.
1492 *
1493 * Unregistering the video devices is done here because every opened instance
1494 * must be closed before the device can be unregistered. An alternative would
1495 * have been to use another reference count for uvc_v4l2_open/uvc_release, and
1496 * unregister the video devices on disconnect when that reference count drops
1497 * to zero.
1498 *
1499 * As this function is called after or during disconnect(), all URBs have
1500 * already been canceled by the USB core. There is no need to kill the
1501 * interrupt URB manually.
1502 */
1503void uvc_delete(struct kref *kref)
1504{
1505 struct uvc_device *dev = container_of(kref, struct uvc_device, kref);
1506 struct list_head *p, *n;
1507
1508 /* Unregister the video device */
1509 uvc_unregister_video(dev);
1510 usb_put_intf(dev->intf);
1511 usb_put_dev(dev->udev);
1512
1513 uvc_status_cleanup(dev);
1514 uvc_ctrl_cleanup_device(dev);
1515
1516 list_for_each_safe(p, n, &dev->entities) {
1517 struct uvc_entity *entity;
1518 entity = list_entry(p, struct uvc_entity, list);
1519 kfree(entity);
1520 }
1521
1522 list_for_each_safe(p, n, &dev->streaming) {
1523 struct uvc_streaming *streaming;
1524 streaming = list_entry(p, struct uvc_streaming, list);
1525 usb_driver_release_interface(&uvc_driver.driver,
1526 streaming->intf);
1527 usb_put_intf(streaming->intf);
1528 kfree(streaming->format);
1529 kfree(streaming->header.bmaControls);
1530 kfree(streaming);
1531 }
1532
1533 kfree(dev);
1534}
1535
1536static int uvc_probe(struct usb_interface *intf,
1537 const struct usb_device_id *id)
1538{
1539 struct usb_device *udev = interface_to_usbdev(intf);
1540 struct uvc_device *dev;
1541 int ret;
1542
1543 if (id->idVendor && id->idProduct)
1544 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1545 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1546 id->idProduct);
1547 else
1548 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1549 udev->devpath);
1550
1551 /* Allocate memory for the device and initialize it */
1552 if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1553 return -ENOMEM;
1554
1555 INIT_LIST_HEAD(&dev->entities);
1556 INIT_LIST_HEAD(&dev->streaming);
1557 kref_init(&dev->kref);
1558
1559 dev->udev = usb_get_dev(udev);
1560 dev->intf = usb_get_intf(intf);
1561 dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1562 dev->quirks = id->driver_info | uvc_quirks_param;
1563
1564 if (udev->product != NULL)
1565 strncpy(dev->name, udev->product, sizeof dev->name);
1566 else
1567 snprintf(dev->name, sizeof dev->name,
1568 "UVC Camera (%04x:%04x)",
1569 le16_to_cpu(udev->descriptor.idVendor),
1570 le16_to_cpu(udev->descriptor.idProduct));
1571
1572 /* Parse the Video Class control descriptor */
1573 if (uvc_parse_control(dev) < 0) {
1574 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1575 "descriptors.\n");
1576 goto error;
1577 }
1578
1579 uvc_printk(KERN_INFO, "Found UVC %u.%02u device %s (%04x:%04x)\n",
1580 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1581 udev->product ? udev->product : "<unnamed>",
1582 le16_to_cpu(udev->descriptor.idVendor),
1583 le16_to_cpu(udev->descriptor.idProduct));
1584
1585 if (uvc_quirks_param != 0) {
1586 uvc_printk(KERN_INFO, "Forcing device quirks 0x%x by module "
1587 "parameter for testing purpose.\n", uvc_quirks_param);
1588 uvc_printk(KERN_INFO, "Please report required quirks to the "
1589 "linux-uvc-devel mailing list.\n");
1590 }
1591
1592 /* Initialize controls */
1593 if (uvc_ctrl_init_device(dev) < 0)
1594 goto error;
1595
1596 /* Register the video devices */
1597 if (uvc_register_video(dev) < 0)
1598 goto error;
1599
1600 /* Save our data pointer in the interface data */
1601 usb_set_intfdata(intf, dev);
1602
1603 /* Initialize the interrupt URB */
1604 if ((ret = uvc_status_init(dev)) < 0) {
1605 uvc_printk(KERN_INFO, "Unable to initialize the status "
1606 "endpoint (%d), status interrupt will not be "
1607 "supported.\n", ret);
1608 }
1609
1610 uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1611 return 0;
1612
1613error:
1614 kref_put(&dev->kref, uvc_delete);
1615 return -ENODEV;
1616}
1617
1618static void uvc_disconnect(struct usb_interface *intf)
1619{
1620 struct uvc_device *dev = usb_get_intfdata(intf);
1621
1622 /* Set the USB interface data to NULL. This can be done outside the
1623 * lock, as there's no other reader.
1624 */
1625 usb_set_intfdata(intf, NULL);
1626
1627 if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOSTREAMING)
1628 return;
1629
1630 /* uvc_v4l2_open() might race uvc_disconnect(). A static driver-wide
1631 * lock is needed to prevent uvc_disconnect from releasing its
1632 * reference to the uvc_device instance after uvc_v4l2_open() received
1633 * the pointer to the device (video_devdata) but before it got the
1634 * chance to increase the reference count (kref_get).
1635 */
1636 mutex_lock(&uvc_driver.open_mutex);
1637
1638 dev->state |= UVC_DEV_DISCONNECTED;
1639 kref_put(&dev->kref, uvc_delete);
1640
1641 mutex_unlock(&uvc_driver.open_mutex);
1642}
1643
1644static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1645{
1646 struct uvc_device *dev = usb_get_intfdata(intf);
1647
1648 uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1649 intf->cur_altsetting->desc.bInterfaceNumber);
1650
1651 /* Controls are cached on the fly so they don't need to be saved. */
1652 if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL)
1653 return uvc_status_suspend(dev);
1654
1655 if (dev->video.streaming->intf != intf) {
1656 uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB "
1657 "interface mismatch.\n");
1658 return -EINVAL;
1659 }
1660
1661 return uvc_video_suspend(&dev->video);
1662}
1663
1664static int uvc_resume(struct usb_interface *intf)
1665{
1666 struct uvc_device *dev = usb_get_intfdata(intf);
1667 int ret;
1668
1669 uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1670 intf->cur_altsetting->desc.bInterfaceNumber);
1671
1672 if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL) {
1673 if ((ret = uvc_ctrl_resume_device(dev)) < 0)
1674 return ret;
1675
1676 return uvc_status_resume(dev);
1677 }
1678
1679 if (dev->video.streaming->intf != intf) {
1680 uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB "
1681 "interface mismatch.\n");
1682 return -EINVAL;
1683 }
1684
1685 return uvc_video_resume(&dev->video);
1686}
1687
1688/* ------------------------------------------------------------------------
1689 * Driver initialization and cleanup
1690 */
1691
1692/*
1693 * The Logitech cameras listed below have their interface class set to
1694 * VENDOR_SPEC because they don't announce themselves as UVC devices, even
1695 * though they are compliant.
1696 */
1697static struct usb_device_id uvc_ids[] = {
1698 /* ALi M5606 (Clevo M540SR) */
1699 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1700 | USB_DEVICE_ID_MATCH_INT_INFO,
1701 .idVendor = 0x0402,
1702 .idProduct = 0x5606,
1703 .bInterfaceClass = USB_CLASS_VIDEO,
1704 .bInterfaceSubClass = 1,
1705 .bInterfaceProtocol = 0,
1706 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1707 /* Creative Live! Optia */
1708 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1709 | USB_DEVICE_ID_MATCH_INT_INFO,
1710 .idVendor = 0x041e,
1711 .idProduct = 0x4057,
1712 .bInterfaceClass = USB_CLASS_VIDEO,
1713 .bInterfaceSubClass = 1,
1714 .bInterfaceProtocol = 0,
1715 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1716 /* Microsoft Lifecam NX-6000 */
1717 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1718 | USB_DEVICE_ID_MATCH_INT_INFO,
1719 .idVendor = 0x045e,
1720 .idProduct = 0x00f8,
1721 .bInterfaceClass = USB_CLASS_VIDEO,
1722 .bInterfaceSubClass = 1,
1723 .bInterfaceProtocol = 0,
1724 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1725 /* Microsoft Lifecam VX-7000 */
1726 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1727 | USB_DEVICE_ID_MATCH_INT_INFO,
1728 .idVendor = 0x045e,
1729 .idProduct = 0x0723,
1730 .bInterfaceClass = USB_CLASS_VIDEO,
1731 .bInterfaceSubClass = 1,
1732 .bInterfaceProtocol = 0,
1733 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1734 /* Logitech Quickcam Fusion */
1735 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1736 | USB_DEVICE_ID_MATCH_INT_INFO,
1737 .idVendor = 0x046d,
1738 .idProduct = 0x08c1,
1739 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1740 .bInterfaceSubClass = 1,
1741 .bInterfaceProtocol = 0 },
1742 /* Logitech Quickcam Orbit MP */
1743 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1744 | USB_DEVICE_ID_MATCH_INT_INFO,
1745 .idVendor = 0x046d,
1746 .idProduct = 0x08c2,
1747 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1748 .bInterfaceSubClass = 1,
1749 .bInterfaceProtocol = 0 },
1750 /* Logitech Quickcam Pro for Notebook */
1751 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1752 | USB_DEVICE_ID_MATCH_INT_INFO,
1753 .idVendor = 0x046d,
1754 .idProduct = 0x08c3,
1755 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1756 .bInterfaceSubClass = 1,
1757 .bInterfaceProtocol = 0 },
1758 /* Logitech Quickcam Pro 5000 */
1759 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1760 | USB_DEVICE_ID_MATCH_INT_INFO,
1761 .idVendor = 0x046d,
1762 .idProduct = 0x08c5,
1763 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1764 .bInterfaceSubClass = 1,
1765 .bInterfaceProtocol = 0 },
1766 /* Logitech Quickcam OEM Dell Notebook */
1767 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1768 | USB_DEVICE_ID_MATCH_INT_INFO,
1769 .idVendor = 0x046d,
1770 .idProduct = 0x08c6,
1771 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1772 .bInterfaceSubClass = 1,
1773 .bInterfaceProtocol = 0 },
1774 /* Logitech Quickcam OEM Cisco VT Camera II */
1775 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1776 | USB_DEVICE_ID_MATCH_INT_INFO,
1777 .idVendor = 0x046d,
1778 .idProduct = 0x08c7,
1779 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1780 .bInterfaceSubClass = 1,
1781 .bInterfaceProtocol = 0 },
1782 /* Apple Built-In iSight */
1783 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1784 | USB_DEVICE_ID_MATCH_INT_INFO,
1785 .idVendor = 0x05ac,
1786 .idProduct = 0x8501,
1787 .bInterfaceClass = USB_CLASS_VIDEO,
1788 .bInterfaceSubClass = 1,
1789 .bInterfaceProtocol = 0,
1790 .driver_info = UVC_QUIRK_PROBE_MINMAX
1791 | UVC_QUIRK_BUILTIN_ISIGHT },
1792 /* Genesys Logic USB 2.0 PC Camera */
1793 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1794 | USB_DEVICE_ID_MATCH_INT_INFO,
1795 .idVendor = 0x05e3,
1796 .idProduct = 0x0505,
1797 .bInterfaceClass = USB_CLASS_VIDEO,
1798 .bInterfaceSubClass = 1,
1799 .bInterfaceProtocol = 0,
1800 .driver_info = UVC_QUIRK_STREAM_NO_FID },
1801 /* Silicon Motion SM371 */
1802 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1803 | USB_DEVICE_ID_MATCH_INT_INFO,
1804 .idVendor = 0x090c,
1805 .idProduct = 0xb371,
1806 .bInterfaceClass = USB_CLASS_VIDEO,
1807 .bInterfaceSubClass = 1,
1808 .bInterfaceProtocol = 0,
1809 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1810 /* MT6227 */
1811 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1812 | USB_DEVICE_ID_MATCH_INT_INFO,
1813 .idVendor = 0x0e8d,
1814 .idProduct = 0x0004,
1815 .bInterfaceClass = USB_CLASS_VIDEO,
1816 .bInterfaceSubClass = 1,
1817 .bInterfaceProtocol = 0,
1818 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1819 /* Syntek (HP Spartan) */
1820 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1821 | USB_DEVICE_ID_MATCH_INT_INFO,
1822 .idVendor = 0x174f,
1823 .idProduct = 0x5212,
1824 .bInterfaceClass = USB_CLASS_VIDEO,
1825 .bInterfaceSubClass = 1,
1826 .bInterfaceProtocol = 0,
1827 .driver_info = UVC_QUIRK_STREAM_NO_FID },
1828 /* Syntek (Asus U3S) */
1829 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1830 | USB_DEVICE_ID_MATCH_INT_INFO,
1831 .idVendor = 0x174f,
1832 .idProduct = 0x8a33,
1833 .bInterfaceClass = USB_CLASS_VIDEO,
1834 .bInterfaceSubClass = 1,
1835 .bInterfaceProtocol = 0,
1836 .driver_info = UVC_QUIRK_STREAM_NO_FID },
1837 /* Ecamm Pico iMage */
1838 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1839 | USB_DEVICE_ID_MATCH_INT_INFO,
1840 .idVendor = 0x18cd,
1841 .idProduct = 0xcafe,
1842 .bInterfaceClass = USB_CLASS_VIDEO,
1843 .bInterfaceSubClass = 1,
1844 .bInterfaceProtocol = 0,
1845 .driver_info = UVC_QUIRK_PROBE_EXTRAFIELDS },
1846 /* Bodelin ProScopeHR */
1847 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1848 | USB_DEVICE_ID_MATCH_DEV_HI
1849 | USB_DEVICE_ID_MATCH_INT_INFO,
1850 .idVendor = 0x19ab,
1851 .idProduct = 0x1000,
1852 .bcdDevice_hi = 0x0126,
1853 .bInterfaceClass = USB_CLASS_VIDEO,
1854 .bInterfaceSubClass = 1,
1855 .bInterfaceProtocol = 0,
1856 .driver_info = UVC_QUIRK_STATUS_INTERVAL },
1857 /* SiGma Micro USB Web Camera */
1858 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1859 | USB_DEVICE_ID_MATCH_INT_INFO,
1860 .idVendor = 0x1c4f,
1861 .idProduct = 0x3000,
1862 .bInterfaceClass = USB_CLASS_VIDEO,
1863 .bInterfaceSubClass = 1,
1864 .bInterfaceProtocol = 0,
1865 .driver_info = UVC_QUIRK_PROBE_MINMAX
1866 | UVC_QUIRK_IGNORE_SELECTOR_UNIT},
1867 /* Acer OEM Webcam - Unknown vendor */
1868 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1869 | USB_DEVICE_ID_MATCH_INT_INFO,
1870 .idVendor = 0x5986,
1871 .idProduct = 0x0100,
1872 .bInterfaceClass = USB_CLASS_VIDEO,
1873 .bInterfaceSubClass = 1,
1874 .bInterfaceProtocol = 0,
1875 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1876 /* Packard Bell OEM Webcam */
1877 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1878 | USB_DEVICE_ID_MATCH_INT_INFO,
1879 .idVendor = 0x5986,
1880 .idProduct = 0x0101,
1881 .bInterfaceClass = USB_CLASS_VIDEO,
1882 .bInterfaceSubClass = 1,
1883 .bInterfaceProtocol = 0,
1884 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1885 /* Acer Crystal Eye webcam */
1886 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1887 | USB_DEVICE_ID_MATCH_INT_INFO,
1888 .idVendor = 0x5986,
1889 .idProduct = 0x0102,
1890 .bInterfaceClass = USB_CLASS_VIDEO,
1891 .bInterfaceSubClass = 1,
1892 .bInterfaceProtocol = 0,
1893 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1894 /* Acer OrbiCam - Unknown vendor */
1895 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1896 | USB_DEVICE_ID_MATCH_INT_INFO,
1897 .idVendor = 0x5986,
1898 .idProduct = 0x0200,
1899 .bInterfaceClass = USB_CLASS_VIDEO,
1900 .bInterfaceSubClass = 1,
1901 .bInterfaceProtocol = 0,
1902 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1903 /* Generic USB Video Class */
1904 { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
1905 {}
1906};
1907
1908MODULE_DEVICE_TABLE(usb, uvc_ids);
1909
1910struct uvc_driver uvc_driver = {
1911 .driver = {
1912 .name = "uvcvideo",
1913 .probe = uvc_probe,
1914 .disconnect = uvc_disconnect,
1915 .suspend = uvc_suspend,
1916 .resume = uvc_resume,
1917 .id_table = uvc_ids,
1918 .supports_autosuspend = 1,
1919 },
1920};
1921
1922static int __init uvc_init(void)
1923{
1924 int result;
1925
1926 INIT_LIST_HEAD(&uvc_driver.devices);
1927 INIT_LIST_HEAD(&uvc_driver.controls);
1928 mutex_init(&uvc_driver.open_mutex);
1929 mutex_init(&uvc_driver.ctrl_mutex);
1930
1931 uvc_ctrl_init();
1932
1933 result = usb_register(&uvc_driver.driver);
1934 if (result == 0)
1935 printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
1936 return result;
1937}
1938
1939static void __exit uvc_cleanup(void)
1940{
1941 usb_deregister(&uvc_driver.driver);
1942}
1943
1944module_init(uvc_init);
1945module_exit(uvc_cleanup);
1946
1947module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
1948MODULE_PARM_DESC(quirks, "Forced device quirks");
1949module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
1950MODULE_PARM_DESC(trace, "Trace level bitmask");
1951
1952MODULE_AUTHOR(DRIVER_AUTHOR);
1953MODULE_DESCRIPTION(DRIVER_DESC);
1954MODULE_LICENSE("GPL");
1955MODULE_VERSION(DRIVER_VERSION);
diff --git a/drivers/media/video/uvc/uvc_isight.c b/drivers/media/video/uvc/uvc_isight.c
new file mode 100644
index 000000000000..37bdefdbead5
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_isight.c
@@ -0,0 +1,134 @@
1/*
2 * uvc_isight.c -- USB Video Class driver - iSight support
3 *
4 * Copyright (C) 2006-2007
5 * Ivan N. Zlatev <contact@i-nz.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14#include <linux/usb.h>
15#include <linux/kernel.h>
16#include <linux/mm.h>
17
18#include "uvcvideo.h"
19
20/* Built-in iSight webcams implements most of UVC 1.0 except a
21 * different packet format. Instead of sending a header at the
22 * beginning of each isochronous transfer payload, the webcam sends a
23 * single header per image (on its own in a packet), followed by
24 * packets containing data only.
25 *
26 * Offset Size (bytes) Description
27 * ------------------------------------------------------------------
28 * 0x00 1 Header length
29 * 0x01 1 Flags (UVC-compliant)
30 * 0x02 4 Always equal to '11223344'
31 * 0x06 8 Always equal to 'deadbeefdeadface'
32 * 0x0e 16 Unknown
33 *
34 * The header can be prefixed by an optional, unknown-purpose byte.
35 */
36
37static int isight_decode(struct uvc_video_queue *queue, struct uvc_buffer *buf,
38 const __u8 *data, unsigned int len)
39{
40 static const __u8 hdr[] = {
41 0x11, 0x22, 0x33, 0x44,
42 0xde, 0xad, 0xbe, 0xef,
43 0xde, 0xad, 0xfa, 0xce
44 };
45
46 unsigned int maxlen, nbytes;
47 __u8 *mem;
48 int is_header = 0;
49
50 if (buf == NULL)
51 return 0;
52
53 if ((len >= 14 && memcmp(&data[2], hdr, 12) == 0) ||
54 (len >= 15 && memcmp(&data[3], hdr, 12) == 0)) {
55 uvc_trace(UVC_TRACE_FRAME, "iSight header found\n");
56 is_header = 1;
57 }
58
59 /* Synchronize to the input stream by waiting for a header packet. */
60 if (buf->state != UVC_BUF_STATE_ACTIVE) {
61 if (!is_header) {
62 uvc_trace(UVC_TRACE_FRAME, "Dropping packet (out of "
63 "sync).\n");
64 return 0;
65 }
66
67 buf->state = UVC_BUF_STATE_ACTIVE;
68 }
69
70 /* Mark the buffer as done if we're at the beginning of a new frame.
71 *
72 * Empty buffers (bytesused == 0) don't trigger end of frame detection
73 * as it doesn't make sense to return an empty buffer.
74 */
75 if (is_header && buf->buf.bytesused != 0) {
76 buf->state = UVC_BUF_STATE_DONE;
77 return -EAGAIN;
78 }
79
80 /* Copy the video data to the buffer. Skip header packets, as they
81 * contain no data.
82 */
83 if (!is_header) {
84 maxlen = buf->buf.length - buf->buf.bytesused;
85 mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused;
86 nbytes = min(len, maxlen);
87 memcpy(mem, data, nbytes);
88 buf->buf.bytesused += nbytes;
89
90 if (len > maxlen || buf->buf.bytesused == buf->buf.length) {
91 uvc_trace(UVC_TRACE_FRAME, "Frame complete "
92 "(overflow).\n");
93 buf->state = UVC_BUF_STATE_DONE;
94 }
95 }
96
97 return 0;
98}
99
100void uvc_video_decode_isight(struct urb *urb, struct uvc_video_device *video,
101 struct uvc_buffer *buf)
102{
103 int ret, i;
104
105 for (i = 0; i < urb->number_of_packets; ++i) {
106 if (urb->iso_frame_desc[i].status < 0) {
107 uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame "
108 "lost (%d).\n",
109 urb->iso_frame_desc[i].status);
110 }
111
112 /* Decode the payload packet.
113 * uvc_video_decode is entered twice when a frame transition
114 * has been detected because the end of frame can only be
115 * reliably detected when the first packet of the new frame
116 * is processed. The first pass detects the transition and
117 * closes the previous frame's buffer, the second pass
118 * processes the data of the first payload of the new frame.
119 */
120 do {
121 ret = isight_decode(&video->queue, buf,
122 urb->transfer_buffer +
123 urb->iso_frame_desc[i].offset,
124 urb->iso_frame_desc[i].actual_length);
125
126 if (buf == NULL)
127 break;
128
129 if (buf->state == UVC_BUF_STATE_DONE ||
130 buf->state == UVC_BUF_STATE_ERROR)
131 buf = uvc_queue_next_buffer(&video->queue, buf);
132 } while (ret == -EAGAIN);
133 }
134}
diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c
new file mode 100644
index 000000000000..0923f0e3b3d4
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -0,0 +1,477 @@
1/*
2 * uvc_queue.c -- USB Video Class driver - Buffers management
3 *
4 * Copyright (C) 2005-2008
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/version.h>
16#include <linux/list.h>
17#include <linux/module.h>
18#include <linux/usb.h>
19#include <linux/videodev2.h>
20#include <linux/vmalloc.h>
21#include <linux/wait.h>
22#include <asm/atomic.h>
23
24#include "uvcvideo.h"
25
26/* ------------------------------------------------------------------------
27 * Video buffers queue management.
28 *
29 * Video queues is initialized by uvc_queue_init(). The function performs
30 * basic initialization of the uvc_video_queue struct and never fails.
31 *
32 * Video buffer allocation and freeing are performed by uvc_alloc_buffers and
33 * uvc_free_buffers respectively. The former acquires the video queue lock,
34 * while the later must be called with the lock held (so that allocation can
35 * free previously allocated buffers). Trying to free buffers that are mapped
36 * to user space will return -EBUSY.
37 *
38 * Video buffers are managed using two queues. However, unlike most USB video
39 * drivers which use an in queue and an out queue, we use a main queue which
40 * holds all queued buffers (both 'empty' and 'done' buffers), and an irq
41 * queue which holds empty buffers. This design (copied from video-buf)
42 * minimizes locking in interrupt, as only one queue is shared between
43 * interrupt and user contexts.
44 *
45 * Use cases
46 * ---------
47 *
48 * Unless stated otherwise, all operations which modify the irq buffers queue
49 * are protected by the irq spinlock.
50 *
51 * 1. The user queues the buffers, starts streaming and dequeues a buffer.
52 *
53 * The buffers are added to the main and irq queues. Both operations are
54 * protected by the queue lock, and the latert is protected by the irq
55 * spinlock as well.
56 *
57 * The completion handler fetches a buffer from the irq queue and fills it
58 * with video data. If no buffer is available (irq queue empty), the handler
59 * returns immediately.
60 *
61 * When the buffer is full, the completion handler removes it from the irq
62 * queue, marks it as ready (UVC_BUF_STATE_DONE) and wake its wait queue.
63 * At that point, any process waiting on the buffer will be woken up. If a
64 * process tries to dequeue a buffer after it has been marked ready, the
65 * dequeing will succeed immediately.
66 *
67 * 2. Buffers are queued, user is waiting on a buffer and the device gets
68 * disconnected.
69 *
70 * When the device is disconnected, the kernel calls the completion handler
71 * with an appropriate status code. The handler marks all buffers in the
72 * irq queue as being erroneous (UVC_BUF_STATE_ERROR) and wakes them up so
73 * that any process waiting on a buffer gets woken up.
74 *
75 * Waking up up the first buffer on the irq list is not enough, as the
76 * process waiting on the buffer might restart the dequeue operation
77 * immediately.
78 *
79 */
80
81void uvc_queue_init(struct uvc_video_queue *queue)
82{
83 mutex_init(&queue->mutex);
84 spin_lock_init(&queue->irqlock);
85 INIT_LIST_HEAD(&queue->mainqueue);
86 INIT_LIST_HEAD(&queue->irqqueue);
87}
88
89/*
90 * Allocate the video buffers.
91 *
92 * Pages are reserved to make sure they will not be swaped, as they will be
93 * filled in URB completion handler.
94 *
95 * Buffers will be individually mapped, so they must all be page aligned.
96 */
97int uvc_alloc_buffers(struct uvc_video_queue *queue, unsigned int nbuffers,
98 unsigned int buflength)
99{
100 unsigned int bufsize = PAGE_ALIGN(buflength);
101 unsigned int i;
102 void *mem = NULL;
103 int ret;
104
105 if (nbuffers > UVC_MAX_VIDEO_BUFFERS)
106 nbuffers = UVC_MAX_VIDEO_BUFFERS;
107
108 mutex_lock(&queue->mutex);
109
110 if ((ret = uvc_free_buffers(queue)) < 0)
111 goto done;
112
113 /* Bail out if no buffers should be allocated. */
114 if (nbuffers == 0)
115 goto done;
116
117 /* Decrement the number of buffers until allocation succeeds. */
118 for (; nbuffers > 0; --nbuffers) {
119 mem = vmalloc_32(nbuffers * bufsize);
120 if (mem != NULL)
121 break;
122 }
123
124 if (mem == NULL) {
125 ret = -ENOMEM;
126 goto done;
127 }
128
129 for (i = 0; i < nbuffers; ++i) {
130 memset(&queue->buffer[i], 0, sizeof queue->buffer[i]);
131 queue->buffer[i].buf.index = i;
132 queue->buffer[i].buf.m.offset = i * bufsize;
133 queue->buffer[i].buf.length = buflength;
134 queue->buffer[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
135 queue->buffer[i].buf.sequence = 0;
136 queue->buffer[i].buf.field = V4L2_FIELD_NONE;
137 queue->buffer[i].buf.memory = V4L2_MEMORY_MMAP;
138 queue->buffer[i].buf.flags = 0;
139 init_waitqueue_head(&queue->buffer[i].wait);
140 }
141
142 queue->mem = mem;
143 queue->count = nbuffers;
144 queue->buf_size = bufsize;
145 ret = nbuffers;
146
147done:
148 mutex_unlock(&queue->mutex);
149 return ret;
150}
151
152/*
153 * Free the video buffers.
154 *
155 * This function must be called with the queue lock held.
156 */
157int uvc_free_buffers(struct uvc_video_queue *queue)
158{
159 unsigned int i;
160
161 for (i = 0; i < queue->count; ++i) {
162 if (queue->buffer[i].vma_use_count != 0)
163 return -EBUSY;
164 }
165
166 if (queue->count) {
167 vfree(queue->mem);
168 queue->count = 0;
169 }
170
171 return 0;
172}
173
174static void __uvc_query_buffer(struct uvc_buffer *buf,
175 struct v4l2_buffer *v4l2_buf)
176{
177 memcpy(v4l2_buf, &buf->buf, sizeof *v4l2_buf);
178
179 if (buf->vma_use_count)
180 v4l2_buf->flags |= V4L2_BUF_FLAG_MAPPED;
181
182 switch (buf->state) {
183 case UVC_BUF_STATE_ERROR:
184 case UVC_BUF_STATE_DONE:
185 v4l2_buf->flags |= V4L2_BUF_FLAG_DONE;
186 break;
187 case UVC_BUF_STATE_QUEUED:
188 case UVC_BUF_STATE_ACTIVE:
189 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
190 break;
191 case UVC_BUF_STATE_IDLE:
192 default:
193 break;
194 }
195}
196
197int uvc_query_buffer(struct uvc_video_queue *queue,
198 struct v4l2_buffer *v4l2_buf)
199{
200 int ret = 0;
201
202 mutex_lock(&queue->mutex);
203 if (v4l2_buf->index >= queue->count) {
204 ret = -EINVAL;
205 goto done;
206 }
207
208 __uvc_query_buffer(&queue->buffer[v4l2_buf->index], v4l2_buf);
209
210done:
211 mutex_unlock(&queue->mutex);
212 return ret;
213}
214
215/*
216 * Queue a video buffer. Attempting to queue a buffer that has already been
217 * queued will return -EINVAL.
218 */
219int uvc_queue_buffer(struct uvc_video_queue *queue,
220 struct v4l2_buffer *v4l2_buf)
221{
222 struct uvc_buffer *buf;
223 unsigned long flags;
224 int ret = 0;
225
226 uvc_trace(UVC_TRACE_CAPTURE, "Queuing buffer %u.\n", v4l2_buf->index);
227
228 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
229 v4l2_buf->memory != V4L2_MEMORY_MMAP) {
230 uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
231 "and/or memory (%u).\n", v4l2_buf->type,
232 v4l2_buf->memory);
233 return -EINVAL;
234 }
235
236 mutex_lock(&queue->mutex);
237 if (v4l2_buf->index >= queue->count) {
238 uvc_trace(UVC_TRACE_CAPTURE, "[E] Out of range index.\n");
239 ret = -EINVAL;
240 goto done;
241 }
242
243 buf = &queue->buffer[v4l2_buf->index];
244 if (buf->state != UVC_BUF_STATE_IDLE) {
245 uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state "
246 "(%u).\n", buf->state);
247 ret = -EINVAL;
248 goto done;
249 }
250
251 spin_lock_irqsave(&queue->irqlock, flags);
252 if (queue->flags & UVC_QUEUE_DISCONNECTED) {
253 spin_unlock_irqrestore(&queue->irqlock, flags);
254 ret = -ENODEV;
255 goto done;
256 }
257 buf->state = UVC_BUF_STATE_QUEUED;
258 buf->buf.bytesused = 0;
259 list_add_tail(&buf->stream, &queue->mainqueue);
260 list_add_tail(&buf->queue, &queue->irqqueue);
261 spin_unlock_irqrestore(&queue->irqlock, flags);
262
263done:
264 mutex_unlock(&queue->mutex);
265 return ret;
266}
267
268static int uvc_queue_waiton(struct uvc_buffer *buf, int nonblocking)
269{
270 if (nonblocking) {
271 return (buf->state != UVC_BUF_STATE_QUEUED &&
272 buf->state != UVC_BUF_STATE_ACTIVE)
273 ? 0 : -EAGAIN;
274 }
275
276 return wait_event_interruptible(buf->wait,
277 buf->state != UVC_BUF_STATE_QUEUED &&
278 buf->state != UVC_BUF_STATE_ACTIVE);
279}
280
281/*
282 * Dequeue a video buffer. If nonblocking is false, block until a buffer is
283 * available.
284 */
285int uvc_dequeue_buffer(struct uvc_video_queue *queue,
286 struct v4l2_buffer *v4l2_buf, int nonblocking)
287{
288 struct uvc_buffer *buf;
289 int ret = 0;
290
291 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
292 v4l2_buf->memory != V4L2_MEMORY_MMAP) {
293 uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
294 "and/or memory (%u).\n", v4l2_buf->type,
295 v4l2_buf->memory);
296 return -EINVAL;
297 }
298
299 mutex_lock(&queue->mutex);
300 if (list_empty(&queue->mainqueue)) {
301 uvc_trace(UVC_TRACE_CAPTURE, "[E] Empty buffer queue.\n");
302 ret = -EINVAL;
303 goto done;
304 }
305
306 buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
307 if ((ret = uvc_queue_waiton(buf, nonblocking)) < 0)
308 goto done;
309
310 uvc_trace(UVC_TRACE_CAPTURE, "Dequeuing buffer %u (%u, %u bytes).\n",
311 buf->buf.index, buf->state, buf->buf.bytesused);
312
313 switch (buf->state) {
314 case UVC_BUF_STATE_ERROR:
315 uvc_trace(UVC_TRACE_CAPTURE, "[W] Corrupted data "
316 "(transmission error).\n");
317 ret = -EIO;
318 case UVC_BUF_STATE_DONE:
319 buf->state = UVC_BUF_STATE_IDLE;
320 break;
321
322 case UVC_BUF_STATE_IDLE:
323 case UVC_BUF_STATE_QUEUED:
324 case UVC_BUF_STATE_ACTIVE:
325 default:
326 uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state %u "
327 "(driver bug?).\n", buf->state);
328 ret = -EINVAL;
329 goto done;
330 }
331
332 list_del(&buf->stream);
333 __uvc_query_buffer(buf, v4l2_buf);
334
335done:
336 mutex_unlock(&queue->mutex);
337 return ret;
338}
339
340/*
341 * Poll the video queue.
342 *
343 * This function implements video queue polling and is intended to be used by
344 * the device poll handler.
345 */
346unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
347 poll_table *wait)
348{
349 struct uvc_buffer *buf;
350 unsigned int mask = 0;
351
352 mutex_lock(&queue->mutex);
353 if (list_empty(&queue->mainqueue)) {
354 mask |= POLLERR;
355 goto done;
356 }
357 buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
358
359 poll_wait(file, &buf->wait, wait);
360 if (buf->state == UVC_BUF_STATE_DONE ||
361 buf->state == UVC_BUF_STATE_ERROR)
362 mask |= POLLIN | POLLRDNORM;
363
364done:
365 mutex_unlock(&queue->mutex);
366 return mask;
367}
368
369/*
370 * Enable or disable the video buffers queue.
371 *
372 * The queue must be enabled before starting video acquisition and must be
373 * disabled after stopping it. This ensures that the video buffers queue
374 * state can be properly initialized before buffers are accessed from the
375 * interrupt handler.
376 *
377 * Enabling the video queue initializes parameters (such as sequence number,
378 * sync pattern, ...). If the queue is already enabled, return -EBUSY.
379 *
380 * Disabling the video queue cancels the queue and removes all buffers from
381 * the main queue.
382 *
383 * This function can't be called from interrupt context. Use
384 * uvc_queue_cancel() instead.
385 */
386int uvc_queue_enable(struct uvc_video_queue *queue, int enable)
387{
388 unsigned int i;
389 int ret = 0;
390
391 mutex_lock(&queue->mutex);
392 if (enable) {
393 if (uvc_queue_streaming(queue)) {
394 ret = -EBUSY;
395 goto done;
396 }
397 queue->sequence = 0;
398 queue->flags |= UVC_QUEUE_STREAMING;
399 } else {
400 uvc_queue_cancel(queue, 0);
401 INIT_LIST_HEAD(&queue->mainqueue);
402
403 for (i = 0; i < queue->count; ++i)
404 queue->buffer[i].state = UVC_BUF_STATE_IDLE;
405
406 queue->flags &= ~UVC_QUEUE_STREAMING;
407 }
408
409done:
410 mutex_unlock(&queue->mutex);
411 return ret;
412}
413
414/*
415 * Cancel the video buffers queue.
416 *
417 * Cancelling the queue marks all buffers on the irq queue as erroneous,
418 * wakes them up and remove them from the queue.
419 *
420 * If the disconnect parameter is set, further calls to uvc_queue_buffer will
421 * fail with -ENODEV.
422 *
423 * This function acquires the irq spinlock and can be called from interrupt
424 * context.
425 */
426void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect)
427{
428 struct uvc_buffer *buf;
429 unsigned long flags;
430
431 spin_lock_irqsave(&queue->irqlock, flags);
432 while (!list_empty(&queue->irqqueue)) {
433 buf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
434 queue);
435 list_del(&buf->queue);
436 buf->state = UVC_BUF_STATE_ERROR;
437 wake_up(&buf->wait);
438 }
439 /* This must be protected by the irqlock spinlock to avoid race
440 * conditions between uvc_queue_buffer and the disconnection event that
441 * could result in an interruptible wait in uvc_dequeue_buffer. Do not
442 * blindly replace this logic by checking for the UVC_DEV_DISCONNECTED
443 * state outside the queue code.
444 */
445 if (disconnect)
446 queue->flags |= UVC_QUEUE_DISCONNECTED;
447 spin_unlock_irqrestore(&queue->irqlock, flags);
448}
449
450struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
451 struct uvc_buffer *buf)
452{
453 struct uvc_buffer *nextbuf;
454 unsigned long flags;
455
456 if ((queue->flags & UVC_QUEUE_DROP_INCOMPLETE) &&
457 buf->buf.length != buf->buf.bytesused) {
458 buf->state = UVC_BUF_STATE_QUEUED;
459 buf->buf.bytesused = 0;
460 return buf;
461 }
462
463 spin_lock_irqsave(&queue->irqlock, flags);
464 list_del(&buf->queue);
465 if (!list_empty(&queue->irqqueue))
466 nextbuf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
467 queue);
468 else
469 nextbuf = NULL;
470 spin_unlock_irqrestore(&queue->irqlock, flags);
471
472 buf->buf.sequence = queue->sequence++;
473 do_gettimeofday(&buf->buf.timestamp);
474
475 wake_up(&buf->wait);
476 return nextbuf;
477}
diff --git a/drivers/media/video/uvc/uvc_status.c b/drivers/media/video/uvc/uvc_status.c
new file mode 100644
index 000000000000..be9084e5eace
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_status.c
@@ -0,0 +1,207 @@
1/*
2 * uvc_status.c -- USB Video Class driver - Status endpoint
3 *
4 * Copyright (C) 2007-2008
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/version.h>
16#include <linux/input.h>
17#include <linux/usb.h>
18#include <linux/usb/input.h>
19
20#include "uvcvideo.h"
21
22/* --------------------------------------------------------------------------
23 * Input device
24 */
25static int uvc_input_init(struct uvc_device *dev)
26{
27 struct usb_device *udev = dev->udev;
28 struct input_dev *input;
29 char *phys = NULL;
30 int ret;
31
32 input = input_allocate_device();
33 if (input == NULL)
34 return -ENOMEM;
35
36 phys = kmalloc(6 + strlen(udev->bus->bus_name) + strlen(udev->devpath),
37 GFP_KERNEL);
38 if (phys == NULL) {
39 ret = -ENOMEM;
40 goto error;
41 }
42 sprintf(phys, "usb-%s-%s", udev->bus->bus_name, udev->devpath);
43
44 input->name = dev->name;
45 input->phys = phys;
46 usb_to_input_id(udev, &input->id);
47 input->dev.parent = &dev->intf->dev;
48
49 set_bit(EV_KEY, input->evbit);
50 set_bit(BTN_0, input->keybit);
51
52 if ((ret = input_register_device(input)) < 0)
53 goto error;
54
55 dev->input = input;
56 return 0;
57
58error:
59 input_free_device(input);
60 kfree(phys);
61 return ret;
62}
63
64static void uvc_input_cleanup(struct uvc_device *dev)
65{
66 if (dev->input)
67 input_unregister_device(dev->input);
68}
69
70/* --------------------------------------------------------------------------
71 * Status interrupt endpoint
72 */
73static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len)
74{
75 if (len < 3) {
76 uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event "
77 "received.\n");
78 return;
79 }
80
81 if (data[2] == 0) {
82 if (len < 4)
83 return;
84 uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n",
85 data[1], data[3] ? "pressed" : "released", len);
86 if (dev->input)
87 input_report_key(dev->input, BTN_0, data[3]);
88 } else {
89 uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x %02x "
90 "len %d.\n", data[1], data[2], data[3], len);
91 }
92}
93
94static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len)
95{
96 char *attrs[3] = { "value", "info", "failure" };
97
98 if (len < 6 || data[2] != 0 || data[4] > 2) {
99 uvc_trace(UVC_TRACE_STATUS, "Invalid control status event "
100 "received.\n");
101 return;
102 }
103
104 uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n",
105 data[1], data[3], attrs[data[4]], len);
106}
107
108static void uvc_status_complete(struct urb *urb)
109{
110 struct uvc_device *dev = urb->context;
111 int len, ret;
112
113 switch (urb->status) {
114 case 0:
115 break;
116
117 case -ENOENT: /* usb_kill_urb() called. */
118 case -ECONNRESET: /* usb_unlink_urb() called. */
119 case -ESHUTDOWN: /* The endpoint is being disabled. */
120 case -EPROTO: /* Device is disconnected (reported by some
121 * host controller). */
122 return;
123
124 default:
125 uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
126 "completion handler.\n", urb->status);
127 return;
128 }
129
130 len = urb->actual_length;
131 if (len > 0) {
132 switch (dev->status[0] & 0x0f) {
133 case UVC_STATUS_TYPE_CONTROL:
134 uvc_event_control(dev, dev->status, len);
135 break;
136
137 case UVC_STATUS_TYPE_STREAMING:
138 uvc_event_streaming(dev, dev->status, len);
139 break;
140
141 default:
142 uvc_printk(KERN_INFO, "unknown event type %u.\n",
143 dev->status[0]);
144 break;
145 }
146 }
147
148 /* Resubmit the URB. */
149 urb->interval = dev->int_ep->desc.bInterval;
150 if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
151 uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
152 ret);
153 }
154}
155
156int uvc_status_init(struct uvc_device *dev)
157{
158 struct usb_host_endpoint *ep = dev->int_ep;
159 unsigned int pipe;
160 int interval;
161
162 if (ep == NULL)
163 return 0;
164
165 uvc_input_init(dev);
166
167 dev->int_urb = usb_alloc_urb(0, GFP_KERNEL);
168 if (dev->int_urb == NULL)
169 return -ENOMEM;
170
171 pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress);
172
173 /* For high-speed interrupt endpoints, the bInterval value is used as
174 * an exponent of two. Some developers forgot about it.
175 */
176 interval = ep->desc.bInterval;
177 if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH &&
178 (dev->quirks & UVC_QUIRK_STATUS_INTERVAL))
179 interval = fls(interval) - 1;
180
181 usb_fill_int_urb(dev->int_urb, dev->udev, pipe,
182 dev->status, sizeof dev->status, uvc_status_complete,
183 dev, interval);
184
185 return usb_submit_urb(dev->int_urb, GFP_KERNEL);
186}
187
188void uvc_status_cleanup(struct uvc_device *dev)
189{
190 usb_kill_urb(dev->int_urb);
191 usb_free_urb(dev->int_urb);
192 uvc_input_cleanup(dev);
193}
194
195int uvc_status_suspend(struct uvc_device *dev)
196{
197 usb_kill_urb(dev->int_urb);
198 return 0;
199}
200
201int uvc_status_resume(struct uvc_device *dev)
202{
203 if (dev->int_urb == NULL)
204 return 0;
205
206 return usb_submit_urb(dev->int_urb, GFP_KERNEL);
207}
diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
new file mode 100644
index 000000000000..2e0a66575bb4
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -0,0 +1,1105 @@
1/*
2 * uvc_v4l2.c -- USB Video Class driver - V4L2 API
3 *
4 * Copyright (C) 2005-2008
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/version.h>
16#include <linux/list.h>
17#include <linux/module.h>
18#include <linux/usb.h>
19#include <linux/videodev2.h>
20#include <linux/vmalloc.h>
21#include <linux/mm.h>
22#include <linux/wait.h>
23#include <asm/atomic.h>
24
25#include <media/v4l2-common.h>
26
27#include "uvcvideo.h"
28
29/* ------------------------------------------------------------------------
30 * V4L2 interface
31 */
32
33/*
34 * Mapping V4L2 controls to UVC controls can be straighforward if done well.
35 * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
36 * must be grouped (for instance the Red Balance, Blue Balance and Do White
37 * Balance V4L2 controls use the White Balance Component UVC control) or
38 * otherwise translated. The approach we take here is to use a translation
39 * table for the controls which can be mapped directly, and handle the others
40 * manually.
41 */
42static int uvc_v4l2_query_menu(struct uvc_video_device *video,
43 struct v4l2_querymenu *query_menu)
44{
45 struct uvc_menu_info *menu_info;
46 struct uvc_control_mapping *mapping;
47 struct uvc_control *ctrl;
48
49 ctrl = uvc_find_control(video, query_menu->id, &mapping);
50 if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
51 return -EINVAL;
52
53 if (query_menu->index >= mapping->menu_count)
54 return -EINVAL;
55
56 menu_info = &mapping->menu_info[query_menu->index];
57 strncpy(query_menu->name, menu_info->name, 32);
58 return 0;
59}
60
61/*
62 * Find the frame interval closest to the requested frame interval for the
63 * given frame format and size. This should be done by the device as part of
64 * the Video Probe and Commit negotiation, but some hardware don't implement
65 * that feature.
66 */
67static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
68{
69 unsigned int i;
70
71 if (frame->bFrameIntervalType) {
72 __u32 best = -1, dist;
73
74 for (i = 0; i < frame->bFrameIntervalType; ++i) {
75 dist = interval > frame->dwFrameInterval[i]
76 ? interval - frame->dwFrameInterval[i]
77 : frame->dwFrameInterval[i] - interval;
78
79 if (dist > best)
80 break;
81
82 best = dist;
83 }
84
85 interval = frame->dwFrameInterval[i-1];
86 } else {
87 const __u32 min = frame->dwFrameInterval[0];
88 const __u32 max = frame->dwFrameInterval[1];
89 const __u32 step = frame->dwFrameInterval[2];
90
91 interval = min + (interval - min + step/2) / step * step;
92 if (interval > max)
93 interval = max;
94 }
95
96 return interval;
97}
98
99static int uvc_v4l2_try_format(struct uvc_video_device *video,
100 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
101 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
102{
103 struct uvc_format *format = NULL;
104 struct uvc_frame *frame = NULL;
105 __u16 rw, rh;
106 unsigned int d, maxd;
107 unsigned int i;
108 __u32 interval;
109 int ret = 0;
110 __u8 *fcc;
111
112 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
113 return -EINVAL;
114
115 fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
116 uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
117 fmt->fmt.pix.pixelformat,
118 fcc[0], fcc[1], fcc[2], fcc[3],
119 fmt->fmt.pix.width, fmt->fmt.pix.height);
120
121 /* Check if the hardware supports the requested format. */
122 for (i = 0; i < video->streaming->nformats; ++i) {
123 format = &video->streaming->format[i];
124 if (format->fcc == fmt->fmt.pix.pixelformat)
125 break;
126 }
127
128 if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
129 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
130 fmt->fmt.pix.pixelformat);
131 return -EINVAL;
132 }
133
134 /* Find the closest image size. The distance between image sizes is
135 * the size in pixels of the non-overlapping regions between the
136 * requested size and the frame-specified size.
137 */
138 rw = fmt->fmt.pix.width;
139 rh = fmt->fmt.pix.height;
140 maxd = (unsigned int)-1;
141
142 for (i = 0; i < format->nframes; ++i) {
143 __u16 w = format->frame[i].wWidth;
144 __u16 h = format->frame[i].wHeight;
145
146 d = min(w, rw) * min(h, rh);
147 d = w*h + rw*rh - 2*d;
148 if (d < maxd) {
149 maxd = d;
150 frame = &format->frame[i];
151 }
152
153 if (maxd == 0)
154 break;
155 }
156
157 if (frame == NULL) {
158 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
159 fmt->fmt.pix.width, fmt->fmt.pix.height);
160 return -EINVAL;
161 }
162
163 /* Use the default frame interval. */
164 interval = frame->dwDefaultFrameInterval;
165 uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
166 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
167 (100000000/interval)%10);
168
169 /* Set the format index, frame index and frame interval. */
170 memset(probe, 0, sizeof *probe);
171 probe->bmHint = 1; /* dwFrameInterval */
172 probe->bFormatIndex = format->index;
173 probe->bFrameIndex = frame->bFrameIndex;
174 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
175 /* Some webcams stall the probe control set request when the
176 * dwMaxVideoFrameSize field is set to zero. The UVC specification
177 * clearly states that the field is read-only from the host, so this
178 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
179 * the webcam to work around the problem.
180 *
181 * The workaround could probably be enabled for all webcams, so the
182 * quirk can be removed if needed. It's currently useful to detect
183 * webcam bugs and fix them before they hit the market (providing
184 * developers test their webcams with the Linux driver as well as with
185 * the Windows driver).
186 */
187 if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
188 probe->dwMaxVideoFrameSize =
189 video->streaming->ctrl.dwMaxVideoFrameSize;
190
191 /* Probe the device */
192 if ((ret = uvc_probe_video(video, probe)) < 0)
193 goto done;
194
195 fmt->fmt.pix.width = frame->wWidth;
196 fmt->fmt.pix.height = frame->wHeight;
197 fmt->fmt.pix.field = V4L2_FIELD_NONE;
198 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
199 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
200 fmt->fmt.pix.colorspace = format->colorspace;
201 fmt->fmt.pix.priv = 0;
202
203 if (uvc_format != NULL)
204 *uvc_format = format;
205 if (uvc_frame != NULL)
206 *uvc_frame = frame;
207
208done:
209 return ret;
210}
211
212static int uvc_v4l2_get_format(struct uvc_video_device *video,
213 struct v4l2_format *fmt)
214{
215 struct uvc_format *format = video->streaming->cur_format;
216 struct uvc_frame *frame = video->streaming->cur_frame;
217
218 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
219 return -EINVAL;
220
221 if (format == NULL || frame == NULL)
222 return -EINVAL;
223
224 fmt->fmt.pix.pixelformat = format->fcc;
225 fmt->fmt.pix.width = frame->wWidth;
226 fmt->fmt.pix.height = frame->wHeight;
227 fmt->fmt.pix.field = V4L2_FIELD_NONE;
228 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
229 fmt->fmt.pix.sizeimage = video->streaming->ctrl.dwMaxVideoFrameSize;
230 fmt->fmt.pix.colorspace = format->colorspace;
231 fmt->fmt.pix.priv = 0;
232
233 return 0;
234}
235
236static int uvc_v4l2_set_format(struct uvc_video_device *video,
237 struct v4l2_format *fmt)
238{
239 struct uvc_streaming_control probe;
240 struct uvc_format *format;
241 struct uvc_frame *frame;
242 int ret;
243
244 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
245 return -EINVAL;
246
247 if (uvc_queue_streaming(&video->queue))
248 return -EBUSY;
249
250 ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
251 if (ret < 0)
252 return ret;
253
254 if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
255 return ret;
256
257 memcpy(&video->streaming->ctrl, &probe, sizeof probe);
258 video->streaming->cur_format = format;
259 video->streaming->cur_frame = frame;
260
261 return 0;
262}
263
264static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
265 struct v4l2_streamparm *parm)
266{
267 uint32_t numerator, denominator;
268
269 if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
270 return -EINVAL;
271
272 numerator = video->streaming->ctrl.dwFrameInterval;
273 denominator = 10000000;
274 uvc_simplify_fraction(&numerator, &denominator, 8, 333);
275
276 memset(parm, 0, sizeof *parm);
277 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
278 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
279 parm->parm.capture.capturemode = 0;
280 parm->parm.capture.timeperframe.numerator = numerator;
281 parm->parm.capture.timeperframe.denominator = denominator;
282 parm->parm.capture.extendedmode = 0;
283 parm->parm.capture.readbuffers = 0;
284
285 return 0;
286}
287
288static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
289 struct v4l2_streamparm *parm)
290{
291 struct uvc_frame *frame = video->streaming->cur_frame;
292 struct uvc_streaming_control probe;
293 uint32_t interval;
294 int ret;
295
296 if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
297 return -EINVAL;
298
299 if (uvc_queue_streaming(&video->queue))
300 return -EBUSY;
301
302 memcpy(&probe, &video->streaming->ctrl, sizeof probe);
303 interval = uvc_fraction_to_interval(
304 parm->parm.capture.timeperframe.numerator,
305 parm->parm.capture.timeperframe.denominator);
306
307 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
308 parm->parm.capture.timeperframe.numerator,
309 parm->parm.capture.timeperframe.denominator,
310 interval);
311 probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
312
313 /* Probe the device with the new settings. */
314 if ((ret = uvc_probe_video(video, &probe)) < 0)
315 return ret;
316
317 /* Commit the new settings. */
318 if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
319 return ret;
320
321 memcpy(&video->streaming->ctrl, &probe, sizeof probe);
322
323 /* Return the actual frame period. */
324 parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval;
325 parm->parm.capture.timeperframe.denominator = 10000000;
326 uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator,
327 &parm->parm.capture.timeperframe.denominator,
328 8, 333);
329
330 return 0;
331}
332
333/* ------------------------------------------------------------------------
334 * Privilege management
335 */
336
337/*
338 * Privilege management is the multiple-open implementation basis. The current
339 * implementation is completely transparent for the end-user and doesn't
340 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
341 * Those ioctls enable finer control on the device (by making possible for a
342 * user to request exclusive access to a device), but are not mature yet.
343 * Switching to the V4L2 priority mechanism might be considered in the future
344 * if this situation changes.
345 *
346 * Each open instance of a UVC device can either be in a privileged or
347 * unprivileged state. Only a single instance can be in a privileged state at
348 * a given time. Trying to perform an operation which requires privileges will
349 * automatically acquire the required privileges if possible, or return -EBUSY
350 * otherwise. Privileges are dismissed when closing the instance.
351 *
352 * Operations which require privileges are:
353 *
354 * - VIDIOC_S_INPUT
355 * - VIDIOC_S_PARM
356 * - VIDIOC_S_FMT
357 * - VIDIOC_TRY_FMT
358 * - VIDIOC_REQBUFS
359 */
360static int uvc_acquire_privileges(struct uvc_fh *handle)
361{
362 int ret = 0;
363
364 /* Always succeed if the handle is already privileged. */
365 if (handle->state == UVC_HANDLE_ACTIVE)
366 return 0;
367
368 /* Check if the device already has a privileged handle. */
369 mutex_lock(&uvc_driver.open_mutex);
370 if (atomic_inc_return(&handle->device->active) != 1) {
371 atomic_dec(&handle->device->active);
372 ret = -EBUSY;
373 goto done;
374 }
375
376 handle->state = UVC_HANDLE_ACTIVE;
377
378done:
379 mutex_unlock(&uvc_driver.open_mutex);
380 return ret;
381}
382
383static void uvc_dismiss_privileges(struct uvc_fh *handle)
384{
385 if (handle->state == UVC_HANDLE_ACTIVE)
386 atomic_dec(&handle->device->active);
387
388 handle->state = UVC_HANDLE_PASSIVE;
389}
390
391static int uvc_has_privileges(struct uvc_fh *handle)
392{
393 return handle->state == UVC_HANDLE_ACTIVE;
394}
395
396/* ------------------------------------------------------------------------
397 * V4L2 file operations
398 */
399
400static int uvc_v4l2_open(struct inode *inode, struct file *file)
401{
402 struct video_device *vdev;
403 struct uvc_video_device *video;
404 struct uvc_fh *handle;
405 int ret = 0;
406
407 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
408 mutex_lock(&uvc_driver.open_mutex);
409 vdev = video_devdata(file);
410 video = video_get_drvdata(vdev);
411
412 if (video->dev->state & UVC_DEV_DISCONNECTED) {
413 ret = -ENODEV;
414 goto done;
415 }
416
417 ret = usb_autopm_get_interface(video->dev->intf);
418 if (ret < 0)
419 goto done;
420
421 /* Create the device handle. */
422 handle = kzalloc(sizeof *handle, GFP_KERNEL);
423 if (handle == NULL) {
424 usb_autopm_put_interface(video->dev->intf);
425 ret = -ENOMEM;
426 goto done;
427 }
428
429 handle->device = video;
430 handle->state = UVC_HANDLE_PASSIVE;
431 file->private_data = handle;
432
433 kref_get(&video->dev->kref);
434
435done:
436 mutex_unlock(&uvc_driver.open_mutex);
437 return ret;
438}
439
440static int uvc_v4l2_release(struct inode *inode, struct file *file)
441{
442 struct video_device *vdev = video_devdata(file);
443 struct uvc_video_device *video = video_get_drvdata(vdev);
444 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
445
446 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
447
448 /* Only free resources if this is a privileged handle. */
449 if (uvc_has_privileges(handle)) {
450 uvc_video_enable(video, 0);
451
452 mutex_lock(&video->queue.mutex);
453 if (uvc_free_buffers(&video->queue) < 0)
454 uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
455 "free buffers.\n");
456 mutex_unlock(&video->queue.mutex);
457 }
458
459 /* Release the file handle. */
460 uvc_dismiss_privileges(handle);
461 kfree(handle);
462 file->private_data = NULL;
463
464 usb_autopm_put_interface(video->dev->intf);
465 kref_put(&video->dev->kref, uvc_delete);
466 return 0;
467}
468
469static int uvc_v4l2_do_ioctl(struct inode *inode, struct file *file,
470 unsigned int cmd, void *arg)
471{
472 struct video_device *vdev = video_devdata(file);
473 struct uvc_video_device *video = video_get_drvdata(vdev);
474 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
475 int ret = 0;
476
477 if (uvc_trace_param & UVC_TRACE_IOCTL)
478 v4l_printk_ioctl(cmd);
479
480 switch (cmd) {
481 /* Query capabilities */
482 case VIDIOC_QUERYCAP:
483 {
484 struct v4l2_capability *cap = arg;
485
486 memset(cap, 0, sizeof *cap);
487 strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
488 strncpy(cap->card, vdev->name, 32);
489 strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
490 sizeof cap->bus_info);
491 cap->version = DRIVER_VERSION_NUMBER;
492 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
493 | V4L2_CAP_STREAMING;
494 break;
495 }
496
497 /* Get, Set & Query control */
498 case VIDIOC_QUERYCTRL:
499 return uvc_query_v4l2_ctrl(video, arg);
500
501 case VIDIOC_G_CTRL:
502 {
503 struct v4l2_control *ctrl = arg;
504 struct v4l2_ext_control xctrl;
505
506 memset(&xctrl, 0, sizeof xctrl);
507 xctrl.id = ctrl->id;
508
509 uvc_ctrl_begin(video);
510 ret = uvc_ctrl_get(video, &xctrl);
511 uvc_ctrl_rollback(video);
512 if (ret >= 0)
513 ctrl->value = xctrl.value;
514 break;
515 }
516
517 case VIDIOC_S_CTRL:
518 {
519 struct v4l2_control *ctrl = arg;
520 struct v4l2_ext_control xctrl;
521
522 memset(&xctrl, 0, sizeof xctrl);
523 xctrl.id = ctrl->id;
524 xctrl.value = ctrl->value;
525
526 uvc_ctrl_begin(video);
527 ret = uvc_ctrl_set(video, &xctrl);
528 if (ret < 0) {
529 uvc_ctrl_rollback(video);
530 return ret;
531 }
532 ret = uvc_ctrl_commit(video);
533 break;
534 }
535
536 case VIDIOC_QUERYMENU:
537 return uvc_v4l2_query_menu(video, arg);
538
539 case VIDIOC_G_EXT_CTRLS:
540 {
541 struct v4l2_ext_controls *ctrls = arg;
542 struct v4l2_ext_control *ctrl = ctrls->controls;
543 unsigned int i;
544
545 uvc_ctrl_begin(video);
546 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
547 ret = uvc_ctrl_get(video, ctrl);
548 if (ret < 0) {
549 uvc_ctrl_rollback(video);
550 ctrls->error_idx = i;
551 return ret;
552 }
553 }
554 ctrls->error_idx = 0;
555 ret = uvc_ctrl_rollback(video);
556 break;
557 }
558
559 case VIDIOC_S_EXT_CTRLS:
560 case VIDIOC_TRY_EXT_CTRLS:
561 {
562 struct v4l2_ext_controls *ctrls = arg;
563 struct v4l2_ext_control *ctrl = ctrls->controls;
564 unsigned int i;
565
566 ret = uvc_ctrl_begin(video);
567 if (ret < 0)
568 return ret;
569
570 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
571 ret = uvc_ctrl_set(video, ctrl);
572 if (ret < 0) {
573 uvc_ctrl_rollback(video);
574 ctrls->error_idx = i;
575 return ret;
576 }
577 }
578
579 ctrls->error_idx = 0;
580
581 if (cmd == VIDIOC_S_EXT_CTRLS)
582 ret = uvc_ctrl_commit(video);
583 else
584 ret = uvc_ctrl_rollback(video);
585 break;
586 }
587
588 /* Get, Set & Enum input */
589 case VIDIOC_ENUMINPUT:
590 {
591 const struct uvc_entity *selector = video->selector;
592 struct v4l2_input *input = arg;
593 struct uvc_entity *iterm = NULL;
594 u32 index = input->index;
595 int pin = 0;
596
597 if (selector == NULL ||
598 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
599 if (index != 0)
600 return -EINVAL;
601 iterm = list_first_entry(&video->iterms,
602 struct uvc_entity, chain);
603 pin = iterm->id;
604 } else if (pin < selector->selector.bNrInPins) {
605 pin = selector->selector.baSourceID[index];
606 list_for_each_entry(iterm, video->iterms.next, chain) {
607 if (iterm->id == pin)
608 break;
609 }
610 }
611
612 if (iterm == NULL || iterm->id != pin)
613 return -EINVAL;
614
615 memset(input, 0, sizeof *input);
616 input->index = index;
617 strncpy(input->name, iterm->name, sizeof input->name);
618 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
619 input->type = V4L2_INPUT_TYPE_CAMERA;
620 break;
621 }
622
623 case VIDIOC_G_INPUT:
624 {
625 u8 input;
626
627 if (video->selector == NULL ||
628 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
629 *(int *)arg = 0;
630 break;
631 }
632
633 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
634 video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
635 &input, 1);
636 if (ret < 0)
637 return ret;
638
639 *(int *)arg = input - 1;
640 break;
641 }
642
643 case VIDIOC_S_INPUT:
644 {
645 u8 input = *(u32 *)arg + 1;
646
647 if ((ret = uvc_acquire_privileges(handle)) < 0)
648 return ret;
649
650 if (video->selector == NULL ||
651 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
652 if (input != 1)
653 return -EINVAL;
654 break;
655 }
656
657 if (input > video->selector->selector.bNrInPins)
658 return -EINVAL;
659
660 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
661 video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
662 &input, 1);
663 }
664
665 /* Try, Get, Set & Enum format */
666 case VIDIOC_ENUM_FMT:
667 {
668 struct v4l2_fmtdesc *fmt = arg;
669 struct uvc_format *format;
670
671 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
672 fmt->index >= video->streaming->nformats)
673 return -EINVAL;
674
675 format = &video->streaming->format[fmt->index];
676 fmt->flags = 0;
677 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
678 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
679 strncpy(fmt->description, format->name,
680 sizeof fmt->description);
681 fmt->description[sizeof fmt->description - 1] = 0;
682 fmt->pixelformat = format->fcc;
683 break;
684 }
685
686 case VIDIOC_TRY_FMT:
687 {
688 struct uvc_streaming_control probe;
689
690 if ((ret = uvc_acquire_privileges(handle)) < 0)
691 return ret;
692
693 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
694 }
695
696 case VIDIOC_S_FMT:
697 if ((ret = uvc_acquire_privileges(handle)) < 0)
698 return ret;
699
700 return uvc_v4l2_set_format(video, arg);
701
702 case VIDIOC_G_FMT:
703 return uvc_v4l2_get_format(video, arg);
704
705 /* Frame size enumeration */
706 case VIDIOC_ENUM_FRAMESIZES:
707 {
708 struct v4l2_frmsizeenum *fsize = arg;
709 struct uvc_format *format = NULL;
710 struct uvc_frame *frame;
711 int i;
712
713 /* Look for the given pixel format */
714 for (i = 0; i < video->streaming->nformats; i++) {
715 if (video->streaming->format[i].fcc ==
716 fsize->pixel_format) {
717 format = &video->streaming->format[i];
718 break;
719 }
720 }
721 if (format == NULL)
722 return -EINVAL;
723
724 if (fsize->index >= format->nframes)
725 return -EINVAL;
726
727 frame = &format->frame[fsize->index];
728 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
729 fsize->discrete.width = frame->wWidth;
730 fsize->discrete.height = frame->wHeight;
731 break;
732 }
733
734 /* Frame interval enumeration */
735 case VIDIOC_ENUM_FRAMEINTERVALS:
736 {
737 struct v4l2_frmivalenum *fival = arg;
738 struct uvc_format *format = NULL;
739 struct uvc_frame *frame = NULL;
740 int i;
741
742 /* Look for the given pixel format and frame size */
743 for (i = 0; i < video->streaming->nformats; i++) {
744 if (video->streaming->format[i].fcc ==
745 fival->pixel_format) {
746 format = &video->streaming->format[i];
747 break;
748 }
749 }
750 if (format == NULL)
751 return -EINVAL;
752
753 for (i = 0; i < format->nframes; i++) {
754 if (format->frame[i].wWidth == fival->width &&
755 format->frame[i].wHeight == fival->height) {
756 frame = &format->frame[i];
757 break;
758 }
759 }
760 if (frame == NULL)
761 return -EINVAL;
762
763 if (frame->bFrameIntervalType) {
764 if (fival->index >= frame->bFrameIntervalType)
765 return -EINVAL;
766
767 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
768 fival->discrete.numerator =
769 frame->dwFrameInterval[fival->index];
770 fival->discrete.denominator = 10000000;
771 uvc_simplify_fraction(&fival->discrete.numerator,
772 &fival->discrete.denominator, 8, 333);
773 } else {
774 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
775 fival->stepwise.min.numerator =
776 frame->dwFrameInterval[0];
777 fival->stepwise.min.denominator = 10000000;
778 fival->stepwise.max.numerator =
779 frame->dwFrameInterval[1];
780 fival->stepwise.max.denominator = 10000000;
781 fival->stepwise.step.numerator =
782 frame->dwFrameInterval[2];
783 fival->stepwise.step.denominator = 10000000;
784 uvc_simplify_fraction(&fival->stepwise.min.numerator,
785 &fival->stepwise.min.denominator, 8, 333);
786 uvc_simplify_fraction(&fival->stepwise.max.numerator,
787 &fival->stepwise.max.denominator, 8, 333);
788 uvc_simplify_fraction(&fival->stepwise.step.numerator,
789 &fival->stepwise.step.denominator, 8, 333);
790 }
791 break;
792 }
793
794 /* Get & Set streaming parameters */
795 case VIDIOC_G_PARM:
796 return uvc_v4l2_get_streamparm(video, arg);
797
798 case VIDIOC_S_PARM:
799 if ((ret = uvc_acquire_privileges(handle)) < 0)
800 return ret;
801
802 return uvc_v4l2_set_streamparm(video, arg);
803
804 /* Cropping and scaling */
805 case VIDIOC_CROPCAP:
806 {
807 struct v4l2_cropcap *ccap = arg;
808 struct uvc_frame *frame = video->streaming->cur_frame;
809
810 if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
811 return -EINVAL;
812
813 ccap->bounds.left = 0;
814 ccap->bounds.top = 0;
815 ccap->bounds.width = frame->wWidth;
816 ccap->bounds.height = frame->wHeight;
817
818 ccap->defrect = ccap->bounds;
819
820 ccap->pixelaspect.numerator = 1;
821 ccap->pixelaspect.denominator = 1;
822 break;
823 }
824
825 case VIDIOC_G_CROP:
826 case VIDIOC_S_CROP:
827 return -EINVAL;
828
829 /* Buffers & streaming */
830 case VIDIOC_REQBUFS:
831 {
832 struct v4l2_requestbuffers *rb = arg;
833 unsigned int bufsize =
834 video->streaming->ctrl.dwMaxVideoFrameSize;
835
836 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
837 rb->memory != V4L2_MEMORY_MMAP)
838 return -EINVAL;
839
840 if ((ret = uvc_acquire_privileges(handle)) < 0)
841 return ret;
842
843 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
844 if (ret < 0)
845 return ret;
846
847 if (!(video->streaming->cur_format->flags &
848 UVC_FMT_FLAG_COMPRESSED))
849 video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE;
850
851 rb->count = ret;
852 ret = 0;
853 break;
854 }
855
856 case VIDIOC_QUERYBUF:
857 {
858 struct v4l2_buffer *buf = arg;
859
860 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
861 return -EINVAL;
862
863 if (!uvc_has_privileges(handle))
864 return -EBUSY;
865
866 return uvc_query_buffer(&video->queue, buf);
867 }
868
869 case VIDIOC_QBUF:
870 if (!uvc_has_privileges(handle))
871 return -EBUSY;
872
873 return uvc_queue_buffer(&video->queue, arg);
874
875 case VIDIOC_DQBUF:
876 if (!uvc_has_privileges(handle))
877 return -EBUSY;
878
879 return uvc_dequeue_buffer(&video->queue, arg,
880 file->f_flags & O_NONBLOCK);
881
882 case VIDIOC_STREAMON:
883 {
884 int *type = arg;
885
886 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
887 return -EINVAL;
888
889 if (!uvc_has_privileges(handle))
890 return -EBUSY;
891
892 if ((ret = uvc_video_enable(video, 1)) < 0)
893 return ret;
894 break;
895 }
896
897 case VIDIOC_STREAMOFF:
898 {
899 int *type = arg;
900
901 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
902 return -EINVAL;
903
904 if (!uvc_has_privileges(handle))
905 return -EBUSY;
906
907 return uvc_video_enable(video, 0);
908 }
909
910 /* Analog video standards make no sense for digital cameras. */
911 case VIDIOC_ENUMSTD:
912 case VIDIOC_QUERYSTD:
913 case VIDIOC_G_STD:
914 case VIDIOC_S_STD:
915
916 case VIDIOC_OVERLAY:
917
918 case VIDIOC_ENUMAUDIO:
919 case VIDIOC_ENUMAUDOUT:
920
921 case VIDIOC_ENUMOUTPUT:
922 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
923 return -EINVAL;
924
925 /* Dynamic controls. */
926 case UVCIOC_CTRL_ADD:
927 {
928 struct uvc_xu_control_info *xinfo = arg;
929 struct uvc_control_info *info;
930
931 if (!capable(CAP_SYS_ADMIN))
932 return -EPERM;
933
934 info = kmalloc(sizeof *info, GFP_KERNEL);
935 if (info == NULL)
936 return -ENOMEM;
937
938 memcpy(info->entity, xinfo->entity, sizeof info->entity);
939 info->index = xinfo->index;
940 info->selector = xinfo->selector;
941 info->size = xinfo->size;
942 info->flags = xinfo->flags;
943
944 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
945 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
946
947 ret = uvc_ctrl_add_info(info);
948 if (ret < 0)
949 kfree(info);
950 break;
951 }
952
953 case UVCIOC_CTRL_MAP:
954 {
955 struct uvc_xu_control_mapping *xmap = arg;
956 struct uvc_control_mapping *map;
957
958 if (!capable(CAP_SYS_ADMIN))
959 return -EPERM;
960
961 map = kmalloc(sizeof *map, GFP_KERNEL);
962 if (map == NULL)
963 return -ENOMEM;
964
965 map->id = xmap->id;
966 memcpy(map->name, xmap->name, sizeof map->name);
967 memcpy(map->entity, xmap->entity, sizeof map->entity);
968 map->selector = xmap->selector;
969 map->size = xmap->size;
970 map->offset = xmap->offset;
971 map->v4l2_type = xmap->v4l2_type;
972 map->data_type = xmap->data_type;
973
974 ret = uvc_ctrl_add_mapping(map);
975 if (ret < 0)
976 kfree(map);
977 break;
978 }
979
980 case UVCIOC_CTRL_GET:
981 return uvc_xu_ctrl_query(video, arg, 0);
982
983 case UVCIOC_CTRL_SET:
984 return uvc_xu_ctrl_query(video, arg, 1);
985
986 default:
987 if ((ret = v4l_compat_translate_ioctl(inode, file, cmd, arg,
988 uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
989 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
990 cmd);
991 return ret;
992 }
993
994 return ret;
995}
996
997static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
998 unsigned int cmd, unsigned long arg)
999{
1000 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n");
1001 return video_usercopy(inode, file, cmd, arg, uvc_v4l2_do_ioctl);
1002}
1003
1004static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1005 size_t count, loff_t *ppos)
1006{
1007 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1008 return -ENODEV;
1009}
1010
1011/*
1012 * VMA operations.
1013 */
1014static void uvc_vm_open(struct vm_area_struct *vma)
1015{
1016 struct uvc_buffer *buffer = vma->vm_private_data;
1017 buffer->vma_use_count++;
1018}
1019
1020static void uvc_vm_close(struct vm_area_struct *vma)
1021{
1022 struct uvc_buffer *buffer = vma->vm_private_data;
1023 buffer->vma_use_count--;
1024}
1025
1026static struct vm_operations_struct uvc_vm_ops = {
1027 .open = uvc_vm_open,
1028 .close = uvc_vm_close,
1029};
1030
1031static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1032{
1033 struct video_device *vdev = video_devdata(file);
1034 struct uvc_video_device *video = video_get_drvdata(vdev);
1035 struct uvc_buffer *buffer;
1036 struct page *page;
1037 unsigned long addr, start, size;
1038 unsigned int i;
1039 int ret = 0;
1040
1041 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1042
1043 start = vma->vm_start;
1044 size = vma->vm_end - vma->vm_start;
1045
1046 mutex_lock(&video->queue.mutex);
1047
1048 for (i = 0; i < video->queue.count; ++i) {
1049 buffer = &video->queue.buffer[i];
1050 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1051 break;
1052 }
1053
1054 if (i == video->queue.count || size != video->queue.buf_size) {
1055 ret = -EINVAL;
1056 goto done;
1057 }
1058
1059 /*
1060 * VM_IO marks the area as being an mmaped region for I/O to a
1061 * device. It also prevents the region from being core dumped.
1062 */
1063 vma->vm_flags |= VM_IO;
1064
1065 addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1066 while (size > 0) {
1067 page = vmalloc_to_page((void *)addr);
1068 if ((ret = vm_insert_page(vma, start, page)) < 0)
1069 goto done;
1070
1071 start += PAGE_SIZE;
1072 addr += PAGE_SIZE;
1073 size -= PAGE_SIZE;
1074 }
1075
1076 vma->vm_ops = &uvc_vm_ops;
1077 vma->vm_private_data = buffer;
1078 uvc_vm_open(vma);
1079
1080done:
1081 mutex_unlock(&video->queue.mutex);
1082 return ret;
1083}
1084
1085static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1086{
1087 struct video_device *vdev = video_devdata(file);
1088 struct uvc_video_device *video = video_get_drvdata(vdev);
1089
1090 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1091
1092 return uvc_queue_poll(&video->queue, file, wait);
1093}
1094
1095struct file_operations uvc_fops = {
1096 .owner = THIS_MODULE,
1097 .open = uvc_v4l2_open,
1098 .release = uvc_v4l2_release,
1099 .ioctl = uvc_v4l2_ioctl,
1100 .compat_ioctl = v4l_compat_ioctl32,
1101 .llseek = no_llseek,
1102 .read = uvc_v4l2_read,
1103 .mmap = uvc_v4l2_mmap,
1104 .poll = uvc_v4l2_poll,
1105};
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
new file mode 100644
index 000000000000..6faf1fb21614
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -0,0 +1,934 @@
1/*
2 * uvc_video.c -- USB Video Class driver - Video handling
3 *
4 * Copyright (C) 2005-2008
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/version.h>
16#include <linux/list.h>
17#include <linux/module.h>
18#include <linux/usb.h>
19#include <linux/videodev2.h>
20#include <linux/vmalloc.h>
21#include <linux/wait.h>
22#include <asm/atomic.h>
23#include <asm/unaligned.h>
24
25#include <media/v4l2-common.h>
26
27#include "uvcvideo.h"
28
29/* ------------------------------------------------------------------------
30 * UVC Controls
31 */
32
33static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
34 __u8 intfnum, __u8 cs, void *data, __u16 size,
35 int timeout)
36{
37 __u8 type = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
38 unsigned int pipe;
39 int ret;
40
41 pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0)
42 : usb_sndctrlpipe(dev->udev, 0);
43 type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT;
44
45 ret = usb_control_msg(dev->udev, pipe, query, type, cs << 8,
46 unit << 8 | intfnum, data, size, timeout);
47
48 if (ret != size) {
49 uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u "
50 "(unit %u) : %d (exp. %u).\n", query, cs, unit, ret,
51 size);
52 return -EIO;
53 }
54
55 return 0;
56}
57
58int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
59 __u8 intfnum, __u8 cs, void *data, __u16 size)
60{
61 return __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size,
62 UVC_CTRL_CONTROL_TIMEOUT);
63}
64
65static void uvc_fixup_buffer_size(struct uvc_video_device *video,
66 struct uvc_streaming_control *ctrl)
67{
68 struct uvc_format *format;
69 struct uvc_frame *frame;
70
71 if (ctrl->bFormatIndex <= 0 ||
72 ctrl->bFormatIndex > video->streaming->nformats)
73 return;
74
75 format = &video->streaming->format[ctrl->bFormatIndex - 1];
76
77 if (ctrl->bFrameIndex <= 0 ||
78 ctrl->bFrameIndex > format->nframes)
79 return;
80
81 frame = &format->frame[ctrl->bFrameIndex - 1];
82
83 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) ||
84 (ctrl->dwMaxVideoFrameSize == 0 &&
85 video->dev->uvc_version < 0x0110))
86 ctrl->dwMaxVideoFrameSize =
87 frame->dwMaxVideoFrameBufferSize;
88}
89
90static int uvc_get_video_ctrl(struct uvc_video_device *video,
91 struct uvc_streaming_control *ctrl, int probe, __u8 query)
92{
93 __u8 data[34];
94 __u8 size;
95 int ret;
96
97 size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
98 ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum,
99 probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, &data, size,
100 UVC_CTRL_STREAMING_TIMEOUT);
101
102 if (ret < 0)
103 return ret;
104
105 ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]);
106 ctrl->bFormatIndex = data[2];
107 ctrl->bFrameIndex = data[3];
108 ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]);
109 ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]);
110 ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]);
111 ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]);
112 ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]);
113 ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]);
114 ctrl->dwMaxVideoFrameSize =
115 le32_to_cpu(get_unaligned((__le32 *)&data[18]));
116 ctrl->dwMaxPayloadTransferSize =
117 le32_to_cpu(get_unaligned((__le32 *)&data[22]));
118
119 if (size == 34) {
120 ctrl->dwClockFrequency =
121 le32_to_cpu(get_unaligned((__le32 *)&data[26]));
122 ctrl->bmFramingInfo = data[30];
123 ctrl->bPreferedVersion = data[31];
124 ctrl->bMinVersion = data[32];
125 ctrl->bMaxVersion = data[33];
126 } else {
127 ctrl->dwClockFrequency = video->dev->clock_frequency;
128 ctrl->bmFramingInfo = 0;
129 ctrl->bPreferedVersion = 0;
130 ctrl->bMinVersion = 0;
131 ctrl->bMaxVersion = 0;
132 }
133
134 /* Some broken devices return a null or wrong dwMaxVideoFrameSize.
135 * Try to get the value from the format and frame descriptor.
136 */
137 uvc_fixup_buffer_size(video, ctrl);
138
139 return 0;
140}
141
142int uvc_set_video_ctrl(struct uvc_video_device *video,
143 struct uvc_streaming_control *ctrl, int probe)
144{
145 __u8 data[34];
146 __u8 size;
147
148 size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
149 memset(data, 0, sizeof data);
150
151 *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint);
152 data[2] = ctrl->bFormatIndex;
153 data[3] = ctrl->bFrameIndex;
154 *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval);
155 *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate);
156 *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate);
157 *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality);
158 *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize);
159 *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay);
160 /* Note: Some of the fields below are not required for IN devices (see
161 * UVC spec, 4.3.1.1), but we still copy them in case support for OUT
162 * devices is added in the future. */
163 put_unaligned(cpu_to_le32(ctrl->dwMaxVideoFrameSize),
164 (__le32 *)&data[18]);
165 put_unaligned(cpu_to_le32(ctrl->dwMaxPayloadTransferSize),
166 (__le32 *)&data[22]);
167
168 if (size == 34) {
169 put_unaligned(cpu_to_le32(ctrl->dwClockFrequency),
170 (__le32 *)&data[26]);
171 data[30] = ctrl->bmFramingInfo;
172 data[31] = ctrl->bPreferedVersion;
173 data[32] = ctrl->bMinVersion;
174 data[33] = ctrl->bMaxVersion;
175 }
176
177 return __uvc_query_ctrl(video->dev, SET_CUR, 0,
178 video->streaming->intfnum,
179 probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, &data, size,
180 UVC_CTRL_STREAMING_TIMEOUT);
181}
182
183int uvc_probe_video(struct uvc_video_device *video,
184 struct uvc_streaming_control *probe)
185{
186 struct uvc_streaming_control probe_min, probe_max;
187 __u16 bandwidth;
188 unsigned int i;
189 int ret;
190
191 mutex_lock(&video->streaming->mutex);
192
193 /* Perform probing. The device should adjust the requested values
194 * according to its capabilities. However, some devices, namely the
195 * first generation UVC Logitech webcams, don't implement the Video
196 * Probe control properly, and just return the needed bandwidth. For
197 * that reason, if the needed bandwidth exceeds the maximum available
198 * bandwidth, try to lower the quality.
199 */
200 if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0)
201 goto done;
202
203 /* Get the minimum and maximum values for compression settings. */
204 if (!(video->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) {
205 ret = uvc_get_video_ctrl(video, &probe_min, 1, GET_MIN);
206 if (ret < 0)
207 goto done;
208 ret = uvc_get_video_ctrl(video, &probe_max, 1, GET_MAX);
209 if (ret < 0)
210 goto done;
211
212 probe->wCompQuality = probe_max.wCompQuality;
213 }
214
215 for (i = 0; i < 2; ++i) {
216 if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0 ||
217 (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0)
218 goto done;
219
220 if (video->streaming->intf->num_altsetting == 1)
221 break;
222
223 bandwidth = probe->dwMaxPayloadTransferSize;
224 if (bandwidth <= video->streaming->maxpsize)
225 break;
226
227 if (video->dev->quirks & UVC_QUIRK_PROBE_MINMAX) {
228 ret = -ENOSPC;
229 goto done;
230 }
231
232 /* TODO: negotiate compression parameters */
233 probe->wKeyFrameRate = probe_min.wKeyFrameRate;
234 probe->wPFrameRate = probe_min.wPFrameRate;
235 probe->wCompQuality = probe_max.wCompQuality;
236 probe->wCompWindowSize = probe_min.wCompWindowSize;
237 }
238
239done:
240 mutex_unlock(&video->streaming->mutex);
241 return ret;
242}
243
244/* ------------------------------------------------------------------------
245 * Video codecs
246 */
247
248/* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */
249#define UVC_STREAM_EOH (1 << 7)
250#define UVC_STREAM_ERR (1 << 6)
251#define UVC_STREAM_STI (1 << 5)
252#define UVC_STREAM_RES (1 << 4)
253#define UVC_STREAM_SCR (1 << 3)
254#define UVC_STREAM_PTS (1 << 2)
255#define UVC_STREAM_EOF (1 << 1)
256#define UVC_STREAM_FID (1 << 0)
257
258/* Video payload decoding is handled by uvc_video_decode_start(),
259 * uvc_video_decode_data() and uvc_video_decode_end().
260 *
261 * uvc_video_decode_start is called with URB data at the start of a bulk or
262 * isochronous payload. It processes header data and returns the header size
263 * in bytes if successful. If an error occurs, it returns a negative error
264 * code. The following error codes have special meanings.
265 *
266 * - EAGAIN informs the caller that the current video buffer should be marked
267 * as done, and that the function should be called again with the same data
268 * and a new video buffer. This is used when end of frame conditions can be
269 * reliably detected at the beginning of the next frame only.
270 *
271 * If an error other than -EAGAIN is returned, the caller will drop the current
272 * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be
273 * made until the next payload. -ENODATA can be used to drop the current
274 * payload if no other error code is appropriate.
275 *
276 * uvc_video_decode_data is called for every URB with URB data. It copies the
277 * data to the video buffer.
278 *
279 * uvc_video_decode_end is called with header data at the end of a bulk or
280 * isochronous payload. It performs any additional header data processing and
281 * returns 0 or a negative error code if an error occured. As header data have
282 * already been processed by uvc_video_decode_start, this functions isn't
283 * required to perform sanity checks a second time.
284 *
285 * For isochronous transfers where a payload is always transfered in a single
286 * URB, the three functions will be called in a row.
287 *
288 * To let the decoder process header data and update its internal state even
289 * when no video buffer is available, uvc_video_decode_start must be prepared
290 * to be called with a NULL buf parameter. uvc_video_decode_data and
291 * uvc_video_decode_end will never be called with a NULL buffer.
292 */
293static int uvc_video_decode_start(struct uvc_video_device *video,
294 struct uvc_buffer *buf, const __u8 *data, int len)
295{
296 __u8 fid;
297
298 /* Sanity checks:
299 * - packet must be at least 2 bytes long
300 * - bHeaderLength value must be at least 2 bytes (see above)
301 * - bHeaderLength value can't be larger than the packet size.
302 */
303 if (len < 2 || data[0] < 2 || data[0] > len)
304 return -EINVAL;
305
306 /* Skip payloads marked with the error bit ("error frames"). */
307 if (data[1] & UVC_STREAM_ERR) {
308 uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit "
309 "set).\n");
310 return -ENODATA;
311 }
312
313 fid = data[1] & UVC_STREAM_FID;
314
315 /* Store the payload FID bit and return immediately when the buffer is
316 * NULL.
317 */
318 if (buf == NULL) {
319 video->last_fid = fid;
320 return -ENODATA;
321 }
322
323 /* Synchronize to the input stream by waiting for the FID bit to be
324 * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE.
325 * queue->last_fid is initialized to -1, so the first isochronous
326 * frame will always be in sync.
327 *
328 * If the device doesn't toggle the FID bit, invert video->last_fid
329 * when the EOF bit is set to force synchronisation on the next packet.
330 */
331 if (buf->state != UVC_BUF_STATE_ACTIVE) {
332 if (fid == video->last_fid) {
333 uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of "
334 "sync).\n");
335 if ((video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) &&
336 (data[1] & UVC_STREAM_EOF))
337 video->last_fid ^= UVC_STREAM_FID;
338 return -ENODATA;
339 }
340
341 /* TODO: Handle PTS and SCR. */
342 buf->state = UVC_BUF_STATE_ACTIVE;
343 }
344
345 /* Mark the buffer as done if we're at the beginning of a new frame.
346 * End of frame detection is better implemented by checking the EOF
347 * bit (FID bit toggling is delayed by one frame compared to the EOF
348 * bit), but some devices don't set the bit at end of frame (and the
349 * last payload can be lost anyway). We thus must check if the FID has
350 * been toggled.
351 *
352 * queue->last_fid is initialized to -1, so the first isochronous
353 * frame will never trigger an end of frame detection.
354 *
355 * Empty buffers (bytesused == 0) don't trigger end of frame detection
356 * as it doesn't make sense to return an empty buffer. This also
357 * avoids detecting and of frame conditions at FID toggling if the
358 * previous payload had the EOF bit set.
359 */
360 if (fid != video->last_fid && buf->buf.bytesused != 0) {
361 uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit "
362 "toggled).\n");
363 buf->state = UVC_BUF_STATE_DONE;
364 return -EAGAIN;
365 }
366
367 video->last_fid = fid;
368
369 return data[0];
370}
371
372static void uvc_video_decode_data(struct uvc_video_device *video,
373 struct uvc_buffer *buf, const __u8 *data, int len)
374{
375 struct uvc_video_queue *queue = &video->queue;
376 unsigned int maxlen, nbytes;
377 void *mem;
378
379 if (len <= 0)
380 return;
381
382 /* Copy the video data to the buffer. */
383 maxlen = buf->buf.length - buf->buf.bytesused;
384 mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused;
385 nbytes = min((unsigned int)len, maxlen);
386 memcpy(mem, data, nbytes);
387 buf->buf.bytesused += nbytes;
388
389 /* Complete the current frame if the buffer size was exceeded. */
390 if (len > maxlen) {
391 uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n");
392 buf->state = UVC_BUF_STATE_DONE;
393 }
394}
395
396static void uvc_video_decode_end(struct uvc_video_device *video,
397 struct uvc_buffer *buf, const __u8 *data, int len)
398{
399 /* Mark the buffer as done if the EOF marker is set. */
400 if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) {
401 uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n");
402 if (data[0] == len)
403 uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n");
404 buf->state = UVC_BUF_STATE_DONE;
405 if (video->dev->quirks & UVC_QUIRK_STREAM_NO_FID)
406 video->last_fid ^= UVC_STREAM_FID;
407 }
408}
409
410/* ------------------------------------------------------------------------
411 * URB handling
412 */
413
414/*
415 * Completion handler for video URBs.
416 */
417static void uvc_video_decode_isoc(struct urb *urb,
418 struct uvc_video_device *video, struct uvc_buffer *buf)
419{
420 u8 *mem;
421 int ret, i;
422
423 for (i = 0; i < urb->number_of_packets; ++i) {
424 if (urb->iso_frame_desc[i].status < 0) {
425 uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame "
426 "lost (%d).\n", urb->iso_frame_desc[i].status);
427 continue;
428 }
429
430 /* Decode the payload header. */
431 mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
432 do {
433 ret = uvc_video_decode_start(video, buf, mem,
434 urb->iso_frame_desc[i].actual_length);
435 if (ret == -EAGAIN)
436 buf = uvc_queue_next_buffer(&video->queue, buf);
437 } while (ret == -EAGAIN);
438
439 if (ret < 0)
440 continue;
441
442 /* Decode the payload data. */
443 uvc_video_decode_data(video, buf, mem + ret,
444 urb->iso_frame_desc[i].actual_length - ret);
445
446 /* Process the header again. */
447 uvc_video_decode_end(video, buf, mem, ret);
448
449 if (buf->state == UVC_BUF_STATE_DONE ||
450 buf->state == UVC_BUF_STATE_ERROR)
451 buf = uvc_queue_next_buffer(&video->queue, buf);
452 }
453}
454
455static void uvc_video_decode_bulk(struct urb *urb,
456 struct uvc_video_device *video, struct uvc_buffer *buf)
457{
458 u8 *mem;
459 int len, ret;
460
461 mem = urb->transfer_buffer;
462 len = urb->actual_length;
463 video->bulk.payload_size += len;
464
465 /* If the URB is the first of its payload, decode and save the
466 * header.
467 */
468 if (video->bulk.header_size == 0) {
469 do {
470 ret = uvc_video_decode_start(video, buf, mem, len);
471 if (ret == -EAGAIN)
472 buf = uvc_queue_next_buffer(&video->queue, buf);
473 } while (ret == -EAGAIN);
474
475 /* If an error occured skip the rest of the payload. */
476 if (ret < 0 || buf == NULL) {
477 video->bulk.skip_payload = 1;
478 return;
479 }
480
481 video->bulk.header_size = ret;
482 memcpy(video->bulk.header, mem, video->bulk.header_size);
483
484 mem += ret;
485 len -= ret;
486 }
487
488 /* The buffer queue might have been cancelled while a bulk transfer
489 * was in progress, so we can reach here with buf equal to NULL. Make
490 * sure buf is never dereferenced if NULL.
491 */
492
493 /* Process video data. */
494 if (!video->bulk.skip_payload && buf != NULL)
495 uvc_video_decode_data(video, buf, mem, len);
496
497 /* Detect the payload end by a URB smaller than the maximum size (or
498 * a payload size equal to the maximum) and process the header again.
499 */
500 if (urb->actual_length < urb->transfer_buffer_length ||
501 video->bulk.payload_size >= video->bulk.max_payload_size) {
502 if (!video->bulk.skip_payload && buf != NULL) {
503 uvc_video_decode_end(video, buf, video->bulk.header,
504 video->bulk.header_size);
505 if (buf->state == UVC_BUF_STATE_DONE ||
506 buf->state == UVC_BUF_STATE_ERROR)
507 buf = uvc_queue_next_buffer(&video->queue, buf);
508 }
509
510 video->bulk.header_size = 0;
511 video->bulk.skip_payload = 0;
512 video->bulk.payload_size = 0;
513 }
514}
515
516static void uvc_video_complete(struct urb *urb)
517{
518 struct uvc_video_device *video = urb->context;
519 struct uvc_video_queue *queue = &video->queue;
520 struct uvc_buffer *buf = NULL;
521 unsigned long flags;
522 int ret;
523
524 switch (urb->status) {
525 case 0:
526 break;
527
528 default:
529 uvc_printk(KERN_WARNING, "Non-zero status (%d) in video "
530 "completion handler.\n", urb->status);
531
532 case -ENOENT: /* usb_kill_urb() called. */
533 if (video->frozen)
534 return;
535
536 case -ECONNRESET: /* usb_unlink_urb() called. */
537 case -ESHUTDOWN: /* The endpoint is being disabled. */
538 uvc_queue_cancel(queue, urb->status == -ESHUTDOWN);
539 return;
540 }
541
542 spin_lock_irqsave(&queue->irqlock, flags);
543 if (!list_empty(&queue->irqqueue))
544 buf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
545 queue);
546 spin_unlock_irqrestore(&queue->irqlock, flags);
547
548 video->decode(urb, video, buf);
549
550 if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
551 uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n",
552 ret);
553 }
554}
555
556/*
557 * Uninitialize isochronous/bulk URBs and free transfer buffers.
558 */
559static void uvc_uninit_video(struct uvc_video_device *video)
560{
561 struct urb *urb;
562 unsigned int i;
563
564 for (i = 0; i < UVC_URBS; ++i) {
565 if ((urb = video->urb[i]) == NULL)
566 continue;
567
568 usb_kill_urb(urb);
569 /* urb->transfer_buffer_length is not touched by USB core, so
570 * we can use it here as the buffer length.
571 */
572 if (video->urb_buffer[i]) {
573 usb_buffer_free(video->dev->udev,
574 urb->transfer_buffer_length,
575 video->urb_buffer[i], urb->transfer_dma);
576 video->urb_buffer[i] = NULL;
577 }
578
579 usb_free_urb(urb);
580 video->urb[i] = NULL;
581 }
582}
583
584/*
585 * Initialize isochronous URBs and allocate transfer buffers. The packet size
586 * is given by the endpoint.
587 */
588static int uvc_init_video_isoc(struct uvc_video_device *video,
589 struct usb_host_endpoint *ep)
590{
591 struct urb *urb;
592 unsigned int npackets, i, j;
593 __u16 psize;
594 __u32 size;
595
596 /* Compute the number of isochronous packets to allocate by dividing
597 * the maximum video frame size by the packet size. Limit the result
598 * to UVC_MAX_ISO_PACKETS.
599 */
600 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
601 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
602
603 size = video->streaming->ctrl.dwMaxVideoFrameSize;
604 if (size > UVC_MAX_FRAME_SIZE)
605 return -EINVAL;
606
607 npackets = (size + psize - 1) / psize;
608 if (npackets > UVC_MAX_ISO_PACKETS)
609 npackets = UVC_MAX_ISO_PACKETS;
610
611 size = npackets * psize;
612
613 for (i = 0; i < UVC_URBS; ++i) {
614 urb = usb_alloc_urb(npackets, GFP_KERNEL);
615 if (urb == NULL) {
616 uvc_uninit_video(video);
617 return -ENOMEM;
618 }
619
620 video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev,
621 size, GFP_KERNEL, &urb->transfer_dma);
622 if (video->urb_buffer[i] == NULL) {
623 usb_free_urb(urb);
624 uvc_uninit_video(video);
625 return -ENOMEM;
626 }
627
628 urb->dev = video->dev->udev;
629 urb->context = video;
630 urb->pipe = usb_rcvisocpipe(video->dev->udev,
631 ep->desc.bEndpointAddress);
632 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
633 urb->interval = ep->desc.bInterval;
634 urb->transfer_buffer = video->urb_buffer[i];
635 urb->complete = uvc_video_complete;
636 urb->number_of_packets = npackets;
637 urb->transfer_buffer_length = size;
638
639 for (j = 0; j < npackets; ++j) {
640 urb->iso_frame_desc[j].offset = j * psize;
641 urb->iso_frame_desc[j].length = psize;
642 }
643
644 video->urb[i] = urb;
645 }
646
647 return 0;
648}
649
650/*
651 * Initialize bulk URBs and allocate transfer buffers. The packet size is
652 * given by the endpoint.
653 */
654static int uvc_init_video_bulk(struct uvc_video_device *video,
655 struct usb_host_endpoint *ep)
656{
657 struct urb *urb;
658 unsigned int pipe, i;
659 __u16 psize;
660 __u32 size;
661
662 /* Compute the bulk URB size. Some devices set the maximum payload
663 * size to a value too high for memory-constrained devices. We must
664 * then transfer the payload accross multiple URBs. To be consistant
665 * with isochronous mode, allocate maximum UVC_MAX_ISO_PACKETS per bulk
666 * URB.
667 */
668 psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff;
669 size = video->streaming->ctrl.dwMaxPayloadTransferSize;
670 video->bulk.max_payload_size = size;
671 if (size > psize * UVC_MAX_ISO_PACKETS)
672 size = psize * UVC_MAX_ISO_PACKETS;
673
674 pipe = usb_rcvbulkpipe(video->dev->udev, ep->desc.bEndpointAddress);
675
676 for (i = 0; i < UVC_URBS; ++i) {
677 urb = usb_alloc_urb(0, GFP_KERNEL);
678 if (urb == NULL) {
679 uvc_uninit_video(video);
680 return -ENOMEM;
681 }
682
683 video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev,
684 size, GFP_KERNEL, &urb->transfer_dma);
685 if (video->urb_buffer[i] == NULL) {
686 usb_free_urb(urb);
687 uvc_uninit_video(video);
688 return -ENOMEM;
689 }
690
691 usb_fill_bulk_urb(urb, video->dev->udev, pipe,
692 video->urb_buffer[i], size, uvc_video_complete,
693 video);
694 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
695
696 video->urb[i] = urb;
697 }
698
699 return 0;
700}
701
702/*
703 * Initialize isochronous/bulk URBs and allocate transfer buffers.
704 */
705static int uvc_init_video(struct uvc_video_device *video)
706{
707 struct usb_interface *intf = video->streaming->intf;
708 struct usb_host_interface *alts;
709 struct usb_host_endpoint *ep = NULL;
710 int intfnum = video->streaming->intfnum;
711 unsigned int bandwidth, psize, i;
712 int ret;
713
714 video->last_fid = -1;
715 video->bulk.header_size = 0;
716 video->bulk.skip_payload = 0;
717 video->bulk.payload_size = 0;
718
719 if (intf->num_altsetting > 1) {
720 /* Isochronous endpoint, select the alternate setting. */
721 bandwidth = video->streaming->ctrl.dwMaxPayloadTransferSize;
722
723 if (bandwidth == 0) {
724 uvc_printk(KERN_WARNING, "device %s requested null "
725 "bandwidth, defaulting to lowest.\n",
726 video->vdev->name);
727 bandwidth = 1;
728 }
729
730 for (i = 0; i < intf->num_altsetting; ++i) {
731 alts = &intf->altsetting[i];
732 ep = uvc_find_endpoint(alts,
733 video->streaming->header.bEndpointAddress);
734 if (ep == NULL)
735 continue;
736
737 /* Check if the bandwidth is high enough. */
738 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
739 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
740 if (psize >= bandwidth)
741 break;
742 }
743
744 if (i >= intf->num_altsetting)
745 return -EIO;
746
747 if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0)
748 return ret;
749
750 ret = uvc_init_video_isoc(video, ep);
751 } else {
752 /* Bulk endpoint, proceed to URB initialization. */
753 ep = uvc_find_endpoint(&intf->altsetting[0],
754 video->streaming->header.bEndpointAddress);
755 if (ep == NULL)
756 return -EIO;
757
758 ret = uvc_init_video_bulk(video, ep);
759 }
760
761 if (ret < 0)
762 return ret;
763
764 /* Submit the URBs. */
765 for (i = 0; i < UVC_URBS; ++i) {
766 if ((ret = usb_submit_urb(video->urb[i], GFP_KERNEL)) < 0) {
767 uvc_printk(KERN_ERR, "Failed to submit URB %u "
768 "(%d).\n", i, ret);
769 uvc_uninit_video(video);
770 return ret;
771 }
772 }
773
774 return 0;
775}
776
777/* --------------------------------------------------------------------------
778 * Suspend/resume
779 */
780
781/*
782 * Stop streaming without disabling the video queue.
783 *
784 * To let userspace applications resume without trouble, we must not touch the
785 * video buffers in any way. We mark the device as frozen to make sure the URB
786 * completion handler won't try to cancel the queue when we kill the URBs.
787 */
788int uvc_video_suspend(struct uvc_video_device *video)
789{
790 if (!uvc_queue_streaming(&video->queue))
791 return 0;
792
793 video->frozen = 1;
794 uvc_uninit_video(video);
795 usb_set_interface(video->dev->udev, video->streaming->intfnum, 0);
796 return 0;
797}
798
799/*
800 * Reconfigure the video interface and restart streaming if it was enable
801 * before suspend.
802 *
803 * If an error occurs, disable the video queue. This will wake all pending
804 * buffers, making sure userspace applications are notified of the problem
805 * instead of waiting forever.
806 */
807int uvc_video_resume(struct uvc_video_device *video)
808{
809 int ret;
810
811 video->frozen = 0;
812
813 if ((ret = uvc_set_video_ctrl(video, &video->streaming->ctrl, 0)) < 0) {
814 uvc_queue_enable(&video->queue, 0);
815 return ret;
816 }
817
818 if (!uvc_queue_streaming(&video->queue))
819 return 0;
820
821 if ((ret = uvc_init_video(video)) < 0)
822 uvc_queue_enable(&video->queue, 0);
823
824 return ret;
825}
826
827/* ------------------------------------------------------------------------
828 * Video device
829 */
830
831/*
832 * Initialize the UVC video device by retrieving the default format and
833 * committing it.
834 *
835 * Some cameras (namely the Fuji Finepix) set the format and frame
836 * indexes to zero. The UVC standard doesn't clearly make this a spec
837 * violation, so try to silently fix the values if possible.
838 *
839 * This function is called before registering the device with V4L.
840 */
841int uvc_video_init(struct uvc_video_device *video)
842{
843 struct uvc_streaming_control *probe = &video->streaming->ctrl;
844 struct uvc_format *format = NULL;
845 struct uvc_frame *frame = NULL;
846 unsigned int i;
847 int ret;
848
849 if (video->streaming->nformats == 0) {
850 uvc_printk(KERN_INFO, "No supported video formats found.\n");
851 return -EINVAL;
852 }
853
854 /* Alternate setting 0 should be the default, yet the XBox Live Vision
855 * Cam (and possibly other devices) crash or otherwise misbehave if
856 * they don't receive a SET_INTERFACE request before any other video
857 * control request.
858 */
859 usb_set_interface(video->dev->udev, video->streaming->intfnum, 0);
860
861 /* Some webcams don't suport GET_DEF request on the probe control. We
862 * fall back to GET_CUR if GET_DEF fails.
863 */
864 if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_DEF)) < 0 &&
865 (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0)
866 return ret;
867
868 /* Check if the default format descriptor exists. Use the first
869 * available format otherwise.
870 */
871 for (i = video->streaming->nformats; i > 0; --i) {
872 format = &video->streaming->format[i-1];
873 if (format->index == probe->bFormatIndex)
874 break;
875 }
876
877 if (format->nframes == 0) {
878 uvc_printk(KERN_INFO, "No frame descriptor found for the "
879 "default format.\n");
880 return -EINVAL;
881 }
882
883 /* Zero bFrameIndex might be correct. Stream-based formats (including
884 * MPEG-2 TS and DV) do not support frames but have a dummy frame
885 * descriptor with bFrameIndex set to zero. If the default frame
886 * descriptor is not found, use the first avalable frame.
887 */
888 for (i = format->nframes; i > 0; --i) {
889 frame = &format->frame[i-1];
890 if (frame->bFrameIndex == probe->bFrameIndex)
891 break;
892 }
893
894 /* Commit the default settings. */
895 probe->bFormatIndex = format->index;
896 probe->bFrameIndex = frame->bFrameIndex;
897 if ((ret = uvc_set_video_ctrl(video, probe, 0)) < 0)
898 return ret;
899
900 video->streaming->cur_format = format;
901 video->streaming->cur_frame = frame;
902 atomic_set(&video->active, 0);
903
904 /* Select the video decoding function */
905 if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)
906 video->decode = uvc_video_decode_isight;
907 else if (video->streaming->intf->num_altsetting > 1)
908 video->decode = uvc_video_decode_isoc;
909 else
910 video->decode = uvc_video_decode_bulk;
911
912 return 0;
913}
914
915/*
916 * Enable or disable the video stream.
917 */
918int uvc_video_enable(struct uvc_video_device *video, int enable)
919{
920 int ret;
921
922 if (!enable) {
923 uvc_uninit_video(video);
924 usb_set_interface(video->dev->udev,
925 video->streaming->intfnum, 0);
926 uvc_queue_enable(&video->queue, 0);
927 return 0;
928 }
929
930 if ((ret = uvc_queue_enable(&video->queue, 1)) < 0)
931 return ret;
932
933 return uvc_init_video(video);
934}
diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
new file mode 100644
index 000000000000..a995a780db1c
--- /dev/null
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -0,0 +1,796 @@
1#ifndef _USB_VIDEO_H_
2#define _USB_VIDEO_H_
3
4#include <linux/kernel.h>
5#include <linux/videodev2.h>
6
7
8/*
9 * Dynamic controls
10 */
11
12/* Data types for UVC control data */
13#define UVC_CTRL_DATA_TYPE_RAW 0
14#define UVC_CTRL_DATA_TYPE_SIGNED 1
15#define UVC_CTRL_DATA_TYPE_UNSIGNED 2
16#define UVC_CTRL_DATA_TYPE_BOOLEAN 3
17#define UVC_CTRL_DATA_TYPE_ENUM 4
18#define UVC_CTRL_DATA_TYPE_BITMASK 5
19
20/* Control flags */
21#define UVC_CONTROL_SET_CUR (1 << 0)
22#define UVC_CONTROL_GET_CUR (1 << 1)
23#define UVC_CONTROL_GET_MIN (1 << 2)
24#define UVC_CONTROL_GET_MAX (1 << 3)
25#define UVC_CONTROL_GET_RES (1 << 4)
26#define UVC_CONTROL_GET_DEF (1 << 5)
27/* Control should be saved at suspend and restored at resume. */
28#define UVC_CONTROL_RESTORE (1 << 6)
29/* Control can be updated by the camera. */
30#define UVC_CONTROL_AUTO_UPDATE (1 << 7)
31
32#define UVC_CONTROL_GET_RANGE (UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_MIN | \
33 UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES | \
34 UVC_CONTROL_GET_DEF)
35
36struct uvc_xu_control_info {
37 __u8 entity[16];
38 __u8 index;
39 __u8 selector;
40 __u16 size;
41 __u32 flags;
42};
43
44struct uvc_xu_control_mapping {
45 __u32 id;
46 __u8 name[32];
47 __u8 entity[16];
48 __u8 selector;
49
50 __u8 size;
51 __u8 offset;
52 enum v4l2_ctrl_type v4l2_type;
53 __u32 data_type;
54};
55
56struct uvc_xu_control {
57 __u8 unit;
58 __u8 selector;
59 __u16 size;
60 __u8 __user *data;
61};
62
63#define UVCIOC_CTRL_ADD _IOW('U', 1, struct uvc_xu_control_info)
64#define UVCIOC_CTRL_MAP _IOWR('U', 2, struct uvc_xu_control_mapping)
65#define UVCIOC_CTRL_GET _IOWR('U', 3, struct uvc_xu_control)
66#define UVCIOC_CTRL_SET _IOW('U', 4, struct uvc_xu_control)
67
68#ifdef __KERNEL__
69
70#include <linux/poll.h>
71
72/* --------------------------------------------------------------------------
73 * UVC constants
74 */
75
76#define SC_UNDEFINED 0x00
77#define SC_VIDEOCONTROL 0x01
78#define SC_VIDEOSTREAMING 0x02
79#define SC_VIDEO_INTERFACE_COLLECTION 0x03
80
81#define PC_PROTOCOL_UNDEFINED 0x00
82
83#define CS_UNDEFINED 0x20
84#define CS_DEVICE 0x21
85#define CS_CONFIGURATION 0x22
86#define CS_STRING 0x23
87#define CS_INTERFACE 0x24
88#define CS_ENDPOINT 0x25
89
90/* VideoControl class specific interface descriptor */
91#define VC_DESCRIPTOR_UNDEFINED 0x00
92#define VC_HEADER 0x01
93#define VC_INPUT_TERMINAL 0x02
94#define VC_OUTPUT_TERMINAL 0x03
95#define VC_SELECTOR_UNIT 0x04
96#define VC_PROCESSING_UNIT 0x05
97#define VC_EXTENSION_UNIT 0x06
98
99/* VideoStreaming class specific interface descriptor */
100#define VS_UNDEFINED 0x00
101#define VS_INPUT_HEADER 0x01
102#define VS_OUTPUT_HEADER 0x02
103#define VS_STILL_IMAGE_FRAME 0x03
104#define VS_FORMAT_UNCOMPRESSED 0x04
105#define VS_FRAME_UNCOMPRESSED 0x05
106#define VS_FORMAT_MJPEG 0x06
107#define VS_FRAME_MJPEG 0x07
108#define VS_FORMAT_MPEG2TS 0x0a
109#define VS_FORMAT_DV 0x0c
110#define VS_COLORFORMAT 0x0d
111#define VS_FORMAT_FRAME_BASED 0x10
112#define VS_FRAME_FRAME_BASED 0x11
113#define VS_FORMAT_STREAM_BASED 0x12
114
115/* Endpoint type */
116#define EP_UNDEFINED 0x00
117#define EP_GENERAL 0x01
118#define EP_ENDPOINT 0x02
119#define EP_INTERRUPT 0x03
120
121/* Request codes */
122#define RC_UNDEFINED 0x00
123#define SET_CUR 0x01
124#define GET_CUR 0x81
125#define GET_MIN 0x82
126#define GET_MAX 0x83
127#define GET_RES 0x84
128#define GET_LEN 0x85
129#define GET_INFO 0x86
130#define GET_DEF 0x87
131
132/* VideoControl interface controls */
133#define VC_CONTROL_UNDEFINED 0x00
134#define VC_VIDEO_POWER_MODE_CONTROL 0x01
135#define VC_REQUEST_ERROR_CODE_CONTROL 0x02
136
137/* Terminal controls */
138#define TE_CONTROL_UNDEFINED 0x00
139
140/* Selector Unit controls */
141#define SU_CONTROL_UNDEFINED 0x00
142#define SU_INPUT_SELECT_CONTROL 0x01
143
144/* Camera Terminal controls */
145#define CT_CONTROL_UNDEFINED 0x00
146#define CT_SCANNING_MODE_CONTROL 0x01
147#define CT_AE_MODE_CONTROL 0x02
148#define CT_AE_PRIORITY_CONTROL 0x03
149#define CT_EXPOSURE_TIME_ABSOLUTE_CONTROL 0x04
150#define CT_EXPOSURE_TIME_RELATIVE_CONTROL 0x05
151#define CT_FOCUS_ABSOLUTE_CONTROL 0x06
152#define CT_FOCUS_RELATIVE_CONTROL 0x07
153#define CT_FOCUS_AUTO_CONTROL 0x08
154#define CT_IRIS_ABSOLUTE_CONTROL 0x09
155#define CT_IRIS_RELATIVE_CONTROL 0x0a
156#define CT_ZOOM_ABSOLUTE_CONTROL 0x0b
157#define CT_ZOOM_RELATIVE_CONTROL 0x0c
158#define CT_PANTILT_ABSOLUTE_CONTROL 0x0d
159#define CT_PANTILT_RELATIVE_CONTROL 0x0e
160#define CT_ROLL_ABSOLUTE_CONTROL 0x0f
161#define CT_ROLL_RELATIVE_CONTROL 0x10
162#define CT_PRIVACY_CONTROL 0x11
163
164/* Processing Unit controls */
165#define PU_CONTROL_UNDEFINED 0x00
166#define PU_BACKLIGHT_COMPENSATION_CONTROL 0x01
167#define PU_BRIGHTNESS_CONTROL 0x02
168#define PU_CONTRAST_CONTROL 0x03
169#define PU_GAIN_CONTROL 0x04
170#define PU_POWER_LINE_FREQUENCY_CONTROL 0x05
171#define PU_HUE_CONTROL 0x06
172#define PU_SATURATION_CONTROL 0x07
173#define PU_SHARPNESS_CONTROL 0x08
174#define PU_GAMMA_CONTROL 0x09
175#define PU_WHITE_BALANCE_TEMPERATURE_CONTROL 0x0a
176#define PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL 0x0b
177#define PU_WHITE_BALANCE_COMPONENT_CONTROL 0x0c
178#define PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL 0x0d
179#define PU_DIGITAL_MULTIPLIER_CONTROL 0x0e
180#define PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL 0x0f
181#define PU_HUE_AUTO_CONTROL 0x10
182#define PU_ANALOG_VIDEO_STANDARD_CONTROL 0x11
183#define PU_ANALOG_LOCK_STATUS_CONTROL 0x12
184
185#define LXU_MOTOR_PANTILT_RELATIVE_CONTROL 0x01
186#define LXU_MOTOR_PANTILT_RESET_CONTROL 0x02
187#define LXU_MOTOR_FOCUS_MOTOR_CONTROL 0x03
188
189/* VideoStreaming interface controls */
190#define VS_CONTROL_UNDEFINED 0x00
191#define VS_PROBE_CONTROL 0x01
192#define VS_COMMIT_CONTROL 0x02
193#define VS_STILL_PROBE_CONTROL 0x03
194#define VS_STILL_COMMIT_CONTROL 0x04
195#define VS_STILL_IMAGE_TRIGGER_CONTROL 0x05
196#define VS_STREAM_ERROR_CODE_CONTROL 0x06
197#define VS_GENERATE_KEY_FRAME_CONTROL 0x07
198#define VS_UPDATE_FRAME_SEGMENT_CONTROL 0x08
199#define VS_SYNC_DELAY_CONTROL 0x09
200
201#define TT_VENDOR_SPECIFIC 0x0100
202#define TT_STREAMING 0x0101
203
204/* Input Terminal types */
205#define ITT_VENDOR_SPECIFIC 0x0200
206#define ITT_CAMERA 0x0201
207#define ITT_MEDIA_TRANSPORT_INPUT 0x0202
208
209/* Output Terminal types */
210#define OTT_VENDOR_SPECIFIC 0x0300
211#define OTT_DISPLAY 0x0301
212#define OTT_MEDIA_TRANSPORT_OUTPUT 0x0302
213
214/* External Terminal types */
215#define EXTERNAL_VENDOR_SPECIFIC 0x0400
216#define COMPOSITE_CONNECTOR 0x0401
217#define SVIDEO_CONNECTOR 0x0402
218#define COMPONENT_CONNECTOR 0x0403
219
220#define UVC_TERM_INPUT 0x0000
221#define UVC_TERM_OUTPUT 0x8000
222
223#define UVC_ENTITY_TYPE(entity) ((entity)->type & 0x7fff)
224#define UVC_ENTITY_IS_UNIT(entity) (((entity)->type & 0xff00) == 0)
225#define UVC_ENTITY_IS_TERM(entity) (((entity)->type & 0xff00) != 0)
226#define UVC_ENTITY_IS_ITERM(entity) \
227 (((entity)->type & 0x8000) == UVC_TERM_INPUT)
228#define UVC_ENTITY_IS_OTERM(entity) \
229 (((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
230
231#define UVC_STATUS_TYPE_CONTROL 1
232#define UVC_STATUS_TYPE_STREAMING 2
233
234/* ------------------------------------------------------------------------
235 * GUIDs
236 */
237#define UVC_GUID_UVC_CAMERA \
238 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
239 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
240#define UVC_GUID_UVC_OUTPUT \
241 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
242 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
243#define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
244 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
245 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
246#define UVC_GUID_UVC_PROCESSING \
247 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
248 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
249#define UVC_GUID_UVC_SELECTOR \
250 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
251 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
252
253#define UVC_GUID_LOGITECH_DEV_INFO \
254 {0x82, 0x06, 0x61, 0x63, 0x70, 0x50, 0xab, 0x49, \
255 0xb8, 0xcc, 0xb3, 0x85, 0x5e, 0x8d, 0x22, 0x1e}
256#define UVC_GUID_LOGITECH_USER_HW \
257 {0x82, 0x06, 0x61, 0x63, 0x70, 0x50, 0xab, 0x49, \
258 0xb8, 0xcc, 0xb3, 0x85, 0x5e, 0x8d, 0x22, 0x1f}
259#define UVC_GUID_LOGITECH_VIDEO \
260 {0x82, 0x06, 0x61, 0x63, 0x70, 0x50, 0xab, 0x49, \
261 0xb8, 0xcc, 0xb3, 0x85, 0x5e, 0x8d, 0x22, 0x50}
262#define UVC_GUID_LOGITECH_MOTOR \
263 {0x82, 0x06, 0x61, 0x63, 0x70, 0x50, 0xab, 0x49, \
264 0xb8, 0xcc, 0xb3, 0x85, 0x5e, 0x8d, 0x22, 0x56}
265
266#define UVC_GUID_FORMAT_MJPEG \
267 { 'M', 'J', 'P', 'G', 0x00, 0x00, 0x10, 0x00, \
268 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
269#define UVC_GUID_FORMAT_YUY2 \
270 { 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00, \
271 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
272#define UVC_GUID_FORMAT_NV12 \
273 { 'N', 'V', '1', '2', 0x00, 0x00, 0x10, 0x00, \
274 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
275#define UVC_GUID_FORMAT_YV12 \
276 { 'Y', 'V', '1', '2', 0x00, 0x00, 0x10, 0x00, \
277 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
278#define UVC_GUID_FORMAT_I420 \
279 { 'I', '4', '2', '0', 0x00, 0x00, 0x10, 0x00, \
280 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
281#define UVC_GUID_FORMAT_UYVY \
282 { 'U', 'Y', 'V', 'Y', 0x00, 0x00, 0x10, 0x00, \
283 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
284#define UVC_GUID_FORMAT_Y800 \
285 { 'Y', '8', '0', '0', 0x00, 0x00, 0x10, 0x00, \
286 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
287#define UVC_GUID_FORMAT_BY8 \
288 { 'B', 'Y', '8', ' ', 0x00, 0x00, 0x10, 0x00, \
289 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
290
291
292/* ------------------------------------------------------------------------
293 * Driver specific constants.
294 */
295
296#define DRIVER_VERSION_NUMBER KERNEL_VERSION(0, 1, 0)
297
298/* Number of isochronous URBs. */
299#define UVC_URBS 5
300/* Maximum number of packets per isochronous URB. */
301#define UVC_MAX_ISO_PACKETS 40
302/* Maximum frame size in bytes, for sanity checking. */
303#define UVC_MAX_FRAME_SIZE (16*1024*1024)
304/* Maximum number of video buffers. */
305#define UVC_MAX_VIDEO_BUFFERS 32
306
307#define UVC_CTRL_CONTROL_TIMEOUT 300
308#define UVC_CTRL_STREAMING_TIMEOUT 1000
309
310/* Devices quirks */
311#define UVC_QUIRK_STATUS_INTERVAL 0x00000001
312#define UVC_QUIRK_PROBE_MINMAX 0x00000002
313#define UVC_QUIRK_PROBE_EXTRAFIELDS 0x00000004
314#define UVC_QUIRK_BUILTIN_ISIGHT 0x00000008
315#define UVC_QUIRK_STREAM_NO_FID 0x00000010
316#define UVC_QUIRK_IGNORE_SELECTOR_UNIT 0x00000020
317
318/* Format flags */
319#define UVC_FMT_FLAG_COMPRESSED 0x00000001
320#define UVC_FMT_FLAG_STREAM 0x00000002
321
322/* ------------------------------------------------------------------------
323 * Structures.
324 */
325
326struct uvc_device;
327
328/* TODO: Put the most frequently accessed fields at the beginning of
329 * structures to maximize cache efficiency.
330 */
331struct uvc_streaming_control {
332 __u16 bmHint;
333 __u8 bFormatIndex;
334 __u8 bFrameIndex;
335 __u32 dwFrameInterval;
336 __u16 wKeyFrameRate;
337 __u16 wPFrameRate;
338 __u16 wCompQuality;
339 __u16 wCompWindowSize;
340 __u16 wDelay;
341 __u32 dwMaxVideoFrameSize;
342 __u32 dwMaxPayloadTransferSize;
343 __u32 dwClockFrequency;
344 __u8 bmFramingInfo;
345 __u8 bPreferedVersion;
346 __u8 bMinVersion;
347 __u8 bMaxVersion;
348};
349
350struct uvc_menu_info {
351 __u32 value;
352 __u8 name[32];
353};
354
355struct uvc_control_info {
356 struct list_head list;
357 struct list_head mappings;
358
359 __u8 entity[16];
360 __u8 index;
361 __u8 selector;
362
363 __u16 size;
364 __u32 flags;
365};
366
367struct uvc_control_mapping {
368 struct list_head list;
369
370 struct uvc_control_info *ctrl;
371
372 __u32 id;
373 __u8 name[32];
374 __u8 entity[16];
375 __u8 selector;
376
377 __u8 size;
378 __u8 offset;
379 enum v4l2_ctrl_type v4l2_type;
380 __u32 data_type;
381
382 struct uvc_menu_info *menu_info;
383 __u32 menu_count;
384};
385
386struct uvc_control {
387 struct uvc_entity *entity;
388 struct uvc_control_info *info;
389
390 __u8 index; /* Used to match the uvc_control entry with a
391 uvc_control_info. */
392 __u8 dirty : 1,
393 loaded : 1,
394 modified : 1;
395
396 __u8 *data;
397};
398
399struct uvc_format_desc {
400 char *name;
401 __u8 guid[16];
402 __u32 fcc;
403};
404
405/* The term 'entity' refers to both UVC units and UVC terminals.
406 *
407 * The type field is either the terminal type (wTerminalType in the terminal
408 * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
409 * As the bDescriptorSubtype field is one byte long, the type value will
410 * always have a null MSB for units. All terminal types defined by the UVC
411 * specification have a non-null MSB, so it is safe to use the MSB to
412 * differentiate between units and terminals as long as the descriptor parsing
413 * code makes sure terminal types have a non-null MSB.
414 *
415 * For terminals, the type's most significant bit stores the terminal
416 * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
417 * always be accessed with the UVC_ENTITY_* macros and never directly.
418 */
419
420struct uvc_entity {
421 struct list_head list; /* Entity as part of a UVC device. */
422 struct list_head chain; /* Entity as part of a video device
423 * chain. */
424 __u8 id;
425 __u16 type;
426 char name[64];
427
428 union {
429 struct {
430 __u16 wObjectiveFocalLengthMin;
431 __u16 wObjectiveFocalLengthMax;
432 __u16 wOcularFocalLength;
433 __u8 bControlSize;
434 __u8 *bmControls;
435 } camera;
436
437 struct {
438 __u8 bControlSize;
439 __u8 *bmControls;
440 __u8 bTransportModeSize;
441 __u8 *bmTransportModes;
442 } media;
443
444 struct {
445 __u8 bSourceID;
446 } output;
447
448 struct {
449 __u8 bSourceID;
450 __u16 wMaxMultiplier;
451 __u8 bControlSize;
452 __u8 *bmControls;
453 __u8 bmVideoStandards;
454 } processing;
455
456 struct {
457 __u8 bNrInPins;
458 __u8 *baSourceID;
459 } selector;
460
461 struct {
462 __u8 guidExtensionCode[16];
463 __u8 bNumControls;
464 __u8 bNrInPins;
465 __u8 *baSourceID;
466 __u8 bControlSize;
467 __u8 *bmControls;
468 __u8 *bmControlsType;
469 } extension;
470 };
471
472 unsigned int ncontrols;
473 struct uvc_control *controls;
474};
475
476struct uvc_frame {
477 __u8 bFrameIndex;
478 __u8 bmCapabilities;
479 __u16 wWidth;
480 __u16 wHeight;
481 __u32 dwMinBitRate;
482 __u32 dwMaxBitRate;
483 __u32 dwMaxVideoFrameBufferSize;
484 __u8 bFrameIntervalType;
485 __u32 dwDefaultFrameInterval;
486 __u32 *dwFrameInterval;
487};
488
489struct uvc_format {
490 __u8 type;
491 __u8 index;
492 __u8 bpp;
493 __u8 colorspace;
494 __u32 fcc;
495 __u32 flags;
496
497 char name[32];
498
499 unsigned int nframes;
500 struct uvc_frame *frame;
501};
502
503struct uvc_streaming_header {
504 __u8 bNumFormats;
505 __u8 bEndpointAddress;
506 __u8 bTerminalLink;
507 __u8 bControlSize;
508 __u8 *bmaControls;
509 /* The following fields are used by input headers only. */
510 __u8 bmInfo;
511 __u8 bStillCaptureMethod;
512 __u8 bTriggerSupport;
513 __u8 bTriggerUsage;
514};
515
516struct uvc_streaming {
517 struct list_head list;
518
519 struct usb_interface *intf;
520 int intfnum;
521 __u16 maxpsize;
522
523 struct uvc_streaming_header header;
524
525 unsigned int nformats;
526 struct uvc_format *format;
527
528 struct uvc_streaming_control ctrl;
529 struct uvc_format *cur_format;
530 struct uvc_frame *cur_frame;
531
532 struct mutex mutex;
533};
534
535enum uvc_buffer_state {
536 UVC_BUF_STATE_IDLE = 0,
537 UVC_BUF_STATE_QUEUED = 1,
538 UVC_BUF_STATE_ACTIVE = 2,
539 UVC_BUF_STATE_DONE = 3,
540 UVC_BUF_STATE_ERROR = 4,
541};
542
543struct uvc_buffer {
544 unsigned long vma_use_count;
545 struct list_head stream;
546
547 /* Touched by interrupt handler. */
548 struct v4l2_buffer buf;
549 struct list_head queue;
550 wait_queue_head_t wait;
551 enum uvc_buffer_state state;
552};
553
554#define UVC_QUEUE_STREAMING (1 << 0)
555#define UVC_QUEUE_DISCONNECTED (1 << 1)
556#define UVC_QUEUE_DROP_INCOMPLETE (1 << 2)
557
558struct uvc_video_queue {
559 void *mem;
560 unsigned int flags;
561 __u32 sequence;
562
563 unsigned int count;
564 unsigned int buf_size;
565 struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
566 struct mutex mutex; /* protects buffers and mainqueue */
567 spinlock_t irqlock; /* protects irqqueue */
568
569 struct list_head mainqueue;
570 struct list_head irqqueue;
571};
572
573struct uvc_video_device {
574 struct uvc_device *dev;
575 struct video_device *vdev;
576 atomic_t active;
577 unsigned int frozen : 1;
578
579 struct list_head iterms;
580 struct uvc_entity *oterm;
581 struct uvc_entity *processing;
582 struct uvc_entity *selector;
583 struct list_head extensions;
584 struct mutex ctrl_mutex;
585
586 struct uvc_video_queue queue;
587
588 /* Video streaming object, must always be non-NULL. */
589 struct uvc_streaming *streaming;
590
591 void (*decode) (struct urb *urb, struct uvc_video_device *video,
592 struct uvc_buffer *buf);
593
594 /* Context data used by the bulk completion handler. */
595 struct {
596 __u8 header[256];
597 unsigned int header_size;
598 int skip_payload;
599 __u32 payload_size;
600 __u32 max_payload_size;
601 } bulk;
602
603 struct urb *urb[UVC_URBS];
604 char *urb_buffer[UVC_URBS];
605
606 __u8 last_fid;
607};
608
609enum uvc_device_state {
610 UVC_DEV_DISCONNECTED = 1,
611};
612
613struct uvc_device {
614 struct usb_device *udev;
615 struct usb_interface *intf;
616 __u32 quirks;
617 int intfnum;
618 char name[32];
619
620 enum uvc_device_state state;
621 struct kref kref;
622 struct list_head list;
623
624 /* Video control interface */
625 __u16 uvc_version;
626 __u32 clock_frequency;
627
628 struct list_head entities;
629
630 struct uvc_video_device video;
631
632 /* Status Interrupt Endpoint */
633 struct usb_host_endpoint *int_ep;
634 struct urb *int_urb;
635 __u8 status[16];
636 struct input_dev *input;
637
638 /* Video Streaming interfaces */
639 struct list_head streaming;
640};
641
642enum uvc_handle_state {
643 UVC_HANDLE_PASSIVE = 0,
644 UVC_HANDLE_ACTIVE = 1,
645};
646
647struct uvc_fh {
648 struct uvc_video_device *device;
649 enum uvc_handle_state state;
650};
651
652struct uvc_driver {
653 struct usb_driver driver;
654
655 struct mutex open_mutex; /* protects from open/disconnect race */
656
657 struct list_head devices; /* struct uvc_device list */
658 struct list_head controls; /* struct uvc_control_info list */
659 struct mutex ctrl_mutex; /* protects controls and devices
660 lists */
661};
662
663/* ------------------------------------------------------------------------
664 * Debugging, printing and logging
665 */
666
667#define UVC_TRACE_PROBE (1 << 0)
668#define UVC_TRACE_DESCR (1 << 1)
669#define UVC_TRACE_CONTROL (1 << 2)
670#define UVC_TRACE_FORMAT (1 << 3)
671#define UVC_TRACE_CAPTURE (1 << 4)
672#define UVC_TRACE_CALLS (1 << 5)
673#define UVC_TRACE_IOCTL (1 << 6)
674#define UVC_TRACE_FRAME (1 << 7)
675#define UVC_TRACE_SUSPEND (1 << 8)
676#define UVC_TRACE_STATUS (1 << 9)
677
678extern unsigned int uvc_trace_param;
679
680#define uvc_trace(flag, msg...) \
681 do { \
682 if (uvc_trace_param & flag) \
683 printk(KERN_DEBUG "uvcvideo: " msg); \
684 } while (0)
685
686#define uvc_printk(level, msg...) \
687 printk(level "uvcvideo: " msg)
688
689#define UVC_GUID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
690 "%02x%02x%02x%02x%02x%02x"
691#define UVC_GUID_ARGS(guid) \
692 (guid)[3], (guid)[2], (guid)[1], (guid)[0], \
693 (guid)[5], (guid)[4], \
694 (guid)[7], (guid)[6], \
695 (guid)[8], (guid)[9], \
696 (guid)[10], (guid)[11], (guid)[12], \
697 (guid)[13], (guid)[14], (guid)[15]
698
699/* --------------------------------------------------------------------------
700 * Internal functions.
701 */
702
703/* Core driver */
704extern struct uvc_driver uvc_driver;
705extern void uvc_delete(struct kref *kref);
706
707/* Video buffers queue management. */
708extern void uvc_queue_init(struct uvc_video_queue *queue);
709extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
710 unsigned int nbuffers, unsigned int buflength);
711extern int uvc_free_buffers(struct uvc_video_queue *queue);
712extern int uvc_query_buffer(struct uvc_video_queue *queue,
713 struct v4l2_buffer *v4l2_buf);
714extern int uvc_queue_buffer(struct uvc_video_queue *queue,
715 struct v4l2_buffer *v4l2_buf);
716extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
717 struct v4l2_buffer *v4l2_buf, int nonblocking);
718extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
719extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
720extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
721 struct uvc_buffer *buf);
722extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
723 struct file *file, poll_table *wait);
724static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
725{
726 return queue->flags & UVC_QUEUE_STREAMING;
727}
728
729/* V4L2 interface */
730extern struct file_operations uvc_fops;
731
732/* Video */
733extern int uvc_video_init(struct uvc_video_device *video);
734extern int uvc_video_suspend(struct uvc_video_device *video);
735extern int uvc_video_resume(struct uvc_video_device *video);
736extern int uvc_video_enable(struct uvc_video_device *video, int enable);
737extern int uvc_probe_video(struct uvc_video_device *video,
738 struct uvc_streaming_control *probe);
739extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
740 __u8 intfnum, __u8 cs, void *data, __u16 size);
741extern int uvc_set_video_ctrl(struct uvc_video_device *video,
742 struct uvc_streaming_control *ctrl, int probe);
743
744/* Status */
745extern int uvc_status_init(struct uvc_device *dev);
746extern void uvc_status_cleanup(struct uvc_device *dev);
747extern int uvc_status_suspend(struct uvc_device *dev);
748extern int uvc_status_resume(struct uvc_device *dev);
749
750/* Controls */
751extern struct uvc_control *uvc_find_control(struct uvc_video_device *video,
752 __u32 v4l2_id, struct uvc_control_mapping **mapping);
753extern int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
754 struct v4l2_queryctrl *v4l2_ctrl);
755
756extern int uvc_ctrl_add_info(struct uvc_control_info *info);
757extern int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping);
758extern int uvc_ctrl_init_device(struct uvc_device *dev);
759extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
760extern int uvc_ctrl_resume_device(struct uvc_device *dev);
761extern void uvc_ctrl_init(void);
762
763extern int uvc_ctrl_begin(struct uvc_video_device *video);
764extern int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback);
765static inline int uvc_ctrl_commit(struct uvc_video_device *video)
766{
767 return __uvc_ctrl_commit(video, 0);
768}
769static inline int uvc_ctrl_rollback(struct uvc_video_device *video)
770{
771 return __uvc_ctrl_commit(video, 1);
772}
773
774extern int uvc_ctrl_get(struct uvc_video_device *video,
775 struct v4l2_ext_control *xctrl);
776extern int uvc_ctrl_set(struct uvc_video_device *video,
777 struct v4l2_ext_control *xctrl);
778
779extern int uvc_xu_ctrl_query(struct uvc_video_device *video,
780 struct uvc_xu_control *ctrl, int set);
781
782/* Utility functions */
783extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
784 unsigned int n_terms, unsigned int threshold);
785extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
786 uint32_t denominator);
787extern struct usb_host_endpoint *uvc_find_endpoint(
788 struct usb_host_interface *alts, __u8 epaddr);
789
790/* Quirks support */
791void uvc_video_decode_isight(struct urb *urb, struct uvc_video_device *video,
792 struct uvc_buffer *buf);
793
794#endif /* __KERNEL__ */
795
796#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 23:08:05 -0500