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path: root/drivers/media/video/uvc/uvc_ctrl.c
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-rw-r--r--drivers/media/video/uvc/uvc_ctrl.c1256
1 files changed, 1256 insertions, 0 deletions
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}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-23 13:59:53 -0500