diff options
author | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
---|---|---|
committer | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
commit | fcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch) | |
tree | a57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/media/video/uvc/uvc_video.c | |
parent | 8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff) |
Diffstat (limited to 'drivers/media/video/uvc/uvc_video.c')
-rw-r--r-- | drivers/media/video/uvc/uvc_video.c | 1273 |
1 files changed, 1273 insertions, 0 deletions
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c new file mode 100644 index 00000000000..ffd1158628b --- /dev/null +++ b/drivers/media/video/uvc/uvc_video.c | |||
@@ -0,0 +1,1273 @@ | |||
1 | /* | ||
2 | * uvc_video.c -- USB Video Class driver - Video handling | ||
3 | * | ||
4 | * Copyright (C) 2005-2010 | ||
5 | * Laurent Pinchart (laurent.pinchart@ideasonboard.com) | ||
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/list.h> | ||
16 | #include <linux/module.h> | ||
17 | #include <linux/slab.h> | ||
18 | #include <linux/usb.h> | ||
19 | #include <linux/videodev2.h> | ||
20 | #include <linux/vmalloc.h> | ||
21 | #include <linux/wait.h> | ||
22 | #include <linux/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 | |||
33 | static 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 | |||
40 | pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0) | ||
41 | : usb_sndctrlpipe(dev->udev, 0); | ||
42 | type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT; | ||
43 | |||
44 | return usb_control_msg(dev->udev, pipe, query, type, cs << 8, | ||
45 | unit << 8 | intfnum, data, size, timeout); | ||
46 | } | ||
47 | |||
48 | static const char *uvc_query_name(__u8 query) | ||
49 | { | ||
50 | switch (query) { | ||
51 | case UVC_SET_CUR: | ||
52 | return "SET_CUR"; | ||
53 | case UVC_GET_CUR: | ||
54 | return "GET_CUR"; | ||
55 | case UVC_GET_MIN: | ||
56 | return "GET_MIN"; | ||
57 | case UVC_GET_MAX: | ||
58 | return "GET_MAX"; | ||
59 | case UVC_GET_RES: | ||
60 | return "GET_RES"; | ||
61 | case UVC_GET_LEN: | ||
62 | return "GET_LEN"; | ||
63 | case UVC_GET_INFO: | ||
64 | return "GET_INFO"; | ||
65 | case UVC_GET_DEF: | ||
66 | return "GET_DEF"; | ||
67 | default: | ||
68 | return "<invalid>"; | ||
69 | } | ||
70 | } | ||
71 | |||
72 | int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, | ||
73 | __u8 intfnum, __u8 cs, void *data, __u16 size) | ||
74 | { | ||
75 | int ret; | ||
76 | |||
77 | ret = __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, | ||
78 | UVC_CTRL_CONTROL_TIMEOUT); | ||
79 | if (ret != size) { | ||
80 | uvc_printk(KERN_ERR, "Failed to query (%s) UVC control %u on " | ||
81 | "unit %u: %d (exp. %u).\n", uvc_query_name(query), cs, | ||
82 | unit, ret, size); | ||
83 | return -EIO; | ||
84 | } | ||
85 | |||
86 | return 0; | ||
87 | } | ||
88 | |||
89 | static void uvc_fixup_video_ctrl(struct uvc_streaming *stream, | ||
90 | struct uvc_streaming_control *ctrl) | ||
91 | { | ||
92 | struct uvc_format *format = NULL; | ||
93 | struct uvc_frame *frame = NULL; | ||
94 | unsigned int i; | ||
95 | |||
96 | for (i = 0; i < stream->nformats; ++i) { | ||
97 | if (stream->format[i].index == ctrl->bFormatIndex) { | ||
98 | format = &stream->format[i]; | ||
99 | break; | ||
100 | } | ||
101 | } | ||
102 | |||
103 | if (format == NULL) | ||
104 | return; | ||
105 | |||
106 | for (i = 0; i < format->nframes; ++i) { | ||
107 | if (format->frame[i].bFrameIndex == ctrl->bFrameIndex) { | ||
108 | frame = &format->frame[i]; | ||
109 | break; | ||
110 | } | ||
111 | } | ||
112 | |||
113 | if (frame == NULL) | ||
114 | return; | ||
115 | |||
116 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || | ||
117 | (ctrl->dwMaxVideoFrameSize == 0 && | ||
118 | stream->dev->uvc_version < 0x0110)) | ||
119 | ctrl->dwMaxVideoFrameSize = | ||
120 | frame->dwMaxVideoFrameBufferSize; | ||
121 | |||
122 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) && | ||
123 | stream->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH && | ||
124 | stream->intf->num_altsetting > 1) { | ||
125 | u32 interval; | ||
126 | u32 bandwidth; | ||
127 | |||
128 | interval = (ctrl->dwFrameInterval > 100000) | ||
129 | ? ctrl->dwFrameInterval | ||
130 | : frame->dwFrameInterval[0]; | ||
131 | |||
132 | /* Compute a bandwidth estimation by multiplying the frame | ||
133 | * size by the number of video frames per second, divide the | ||
134 | * result by the number of USB frames (or micro-frames for | ||
135 | * high-speed devices) per second and add the UVC header size | ||
136 | * (assumed to be 12 bytes long). | ||
137 | */ | ||
138 | bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp; | ||
139 | bandwidth *= 10000000 / interval + 1; | ||
140 | bandwidth /= 1000; | ||
141 | if (stream->dev->udev->speed == USB_SPEED_HIGH) | ||
142 | bandwidth /= 8; | ||
143 | bandwidth += 12; | ||
144 | |||
145 | /* The bandwidth estimate is too low for many cameras. Don't use | ||
146 | * maximum packet sizes lower than 1024 bytes to try and work | ||
147 | * around the problem. According to measurements done on two | ||
148 | * different camera models, the value is high enough to get most | ||
149 | * resolutions working while not preventing two simultaneous | ||
150 | * VGA streams at 15 fps. | ||
151 | */ | ||
152 | bandwidth = max_t(u32, bandwidth, 1024); | ||
153 | |||
154 | ctrl->dwMaxPayloadTransferSize = bandwidth; | ||
155 | } | ||
156 | } | ||
157 | |||
158 | static int uvc_get_video_ctrl(struct uvc_streaming *stream, | ||
159 | struct uvc_streaming_control *ctrl, int probe, __u8 query) | ||
160 | { | ||
161 | __u8 *data; | ||
162 | __u16 size; | ||
163 | int ret; | ||
164 | |||
165 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; | ||
166 | if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) && | ||
167 | query == UVC_GET_DEF) | ||
168 | return -EIO; | ||
169 | |||
170 | data = kmalloc(size, GFP_KERNEL); | ||
171 | if (data == NULL) | ||
172 | return -ENOMEM; | ||
173 | |||
174 | ret = __uvc_query_ctrl(stream->dev, query, 0, stream->intfnum, | ||
175 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, | ||
176 | size, uvc_timeout_param); | ||
177 | |||
178 | if ((query == UVC_GET_MIN || query == UVC_GET_MAX) && ret == 2) { | ||
179 | /* Some cameras, mostly based on Bison Electronics chipsets, | ||
180 | * answer a GET_MIN or GET_MAX request with the wCompQuality | ||
181 | * field only. | ||
182 | */ | ||
183 | uvc_warn_once(stream->dev, UVC_WARN_MINMAX, "UVC non " | ||
184 | "compliance - GET_MIN/MAX(PROBE) incorrectly " | ||
185 | "supported. Enabling workaround.\n"); | ||
186 | memset(ctrl, 0, sizeof *ctrl); | ||
187 | ctrl->wCompQuality = le16_to_cpup((__le16 *)data); | ||
188 | ret = 0; | ||
189 | goto out; | ||
190 | } else if (query == UVC_GET_DEF && probe == 1 && ret != size) { | ||
191 | /* Many cameras don't support the GET_DEF request on their | ||
192 | * video probe control. Warn once and return, the caller will | ||
193 | * fall back to GET_CUR. | ||
194 | */ | ||
195 | uvc_warn_once(stream->dev, UVC_WARN_PROBE_DEF, "UVC non " | ||
196 | "compliance - GET_DEF(PROBE) not supported. " | ||
197 | "Enabling workaround.\n"); | ||
198 | ret = -EIO; | ||
199 | goto out; | ||
200 | } else if (ret != size) { | ||
201 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : " | ||
202 | "%d (exp. %u).\n", query, probe ? "probe" : "commit", | ||
203 | ret, size); | ||
204 | ret = -EIO; | ||
205 | goto out; | ||
206 | } | ||
207 | |||
208 | ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); | ||
209 | ctrl->bFormatIndex = data[2]; | ||
210 | ctrl->bFrameIndex = data[3]; | ||
211 | ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]); | ||
212 | ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]); | ||
213 | ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]); | ||
214 | ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]); | ||
215 | ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]); | ||
216 | ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]); | ||
217 | ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]); | ||
218 | ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]); | ||
219 | |||
220 | if (size == 34) { | ||
221 | ctrl->dwClockFrequency = get_unaligned_le32(&data[26]); | ||
222 | ctrl->bmFramingInfo = data[30]; | ||
223 | ctrl->bPreferedVersion = data[31]; | ||
224 | ctrl->bMinVersion = data[32]; | ||
225 | ctrl->bMaxVersion = data[33]; | ||
226 | } else { | ||
227 | ctrl->dwClockFrequency = stream->dev->clock_frequency; | ||
228 | ctrl->bmFramingInfo = 0; | ||
229 | ctrl->bPreferedVersion = 0; | ||
230 | ctrl->bMinVersion = 0; | ||
231 | ctrl->bMaxVersion = 0; | ||
232 | } | ||
233 | |||
234 | /* Some broken devices return null or wrong dwMaxVideoFrameSize and | ||
235 | * dwMaxPayloadTransferSize fields. Try to get the value from the | ||
236 | * format and frame descriptors. | ||
237 | */ | ||
238 | uvc_fixup_video_ctrl(stream, ctrl); | ||
239 | ret = 0; | ||
240 | |||
241 | out: | ||
242 | kfree(data); | ||
243 | return ret; | ||
244 | } | ||
245 | |||
246 | static int uvc_set_video_ctrl(struct uvc_streaming *stream, | ||
247 | struct uvc_streaming_control *ctrl, int probe) | ||
248 | { | ||
249 | __u8 *data; | ||
250 | __u16 size; | ||
251 | int ret; | ||
252 | |||
253 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; | ||
254 | data = kzalloc(size, GFP_KERNEL); | ||
255 | if (data == NULL) | ||
256 | return -ENOMEM; | ||
257 | |||
258 | *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint); | ||
259 | data[2] = ctrl->bFormatIndex; | ||
260 | data[3] = ctrl->bFrameIndex; | ||
261 | *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval); | ||
262 | *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate); | ||
263 | *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate); | ||
264 | *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality); | ||
265 | *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize); | ||
266 | *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay); | ||
267 | put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]); | ||
268 | put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]); | ||
269 | |||
270 | if (size == 34) { | ||
271 | put_unaligned_le32(ctrl->dwClockFrequency, &data[26]); | ||
272 | data[30] = ctrl->bmFramingInfo; | ||
273 | data[31] = ctrl->bPreferedVersion; | ||
274 | data[32] = ctrl->bMinVersion; | ||
275 | data[33] = ctrl->bMaxVersion; | ||
276 | } | ||
277 | |||
278 | ret = __uvc_query_ctrl(stream->dev, UVC_SET_CUR, 0, stream->intfnum, | ||
279 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, | ||
280 | size, uvc_timeout_param); | ||
281 | if (ret != size) { | ||
282 | uvc_printk(KERN_ERR, "Failed to set UVC %s control : " | ||
283 | "%d (exp. %u).\n", probe ? "probe" : "commit", | ||
284 | ret, size); | ||
285 | ret = -EIO; | ||
286 | } | ||
287 | |||
288 | kfree(data); | ||
289 | return ret; | ||
290 | } | ||
291 | |||
292 | int uvc_probe_video(struct uvc_streaming *stream, | ||
293 | struct uvc_streaming_control *probe) | ||
294 | { | ||
295 | struct uvc_streaming_control probe_min, probe_max; | ||
296 | __u16 bandwidth; | ||
297 | unsigned int i; | ||
298 | int ret; | ||
299 | |||
300 | /* Perform probing. The device should adjust the requested values | ||
301 | * according to its capabilities. However, some devices, namely the | ||
302 | * first generation UVC Logitech webcams, don't implement the Video | ||
303 | * Probe control properly, and just return the needed bandwidth. For | ||
304 | * that reason, if the needed bandwidth exceeds the maximum available | ||
305 | * bandwidth, try to lower the quality. | ||
306 | */ | ||
307 | ret = uvc_set_video_ctrl(stream, probe, 1); | ||
308 | if (ret < 0) | ||
309 | goto done; | ||
310 | |||
311 | /* Get the minimum and maximum values for compression settings. */ | ||
312 | if (!(stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { | ||
313 | ret = uvc_get_video_ctrl(stream, &probe_min, 1, UVC_GET_MIN); | ||
314 | if (ret < 0) | ||
315 | goto done; | ||
316 | ret = uvc_get_video_ctrl(stream, &probe_max, 1, UVC_GET_MAX); | ||
317 | if (ret < 0) | ||
318 | goto done; | ||
319 | |||
320 | probe->wCompQuality = probe_max.wCompQuality; | ||
321 | } | ||
322 | |||
323 | for (i = 0; i < 2; ++i) { | ||
324 | ret = uvc_set_video_ctrl(stream, probe, 1); | ||
325 | if (ret < 0) | ||
326 | goto done; | ||
327 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); | ||
328 | if (ret < 0) | ||
329 | goto done; | ||
330 | |||
331 | if (stream->intf->num_altsetting == 1) | ||
332 | break; | ||
333 | |||
334 | bandwidth = probe->dwMaxPayloadTransferSize; | ||
335 | if (bandwidth <= stream->maxpsize) | ||
336 | break; | ||
337 | |||
338 | if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { | ||
339 | ret = -ENOSPC; | ||
340 | goto done; | ||
341 | } | ||
342 | |||
343 | /* TODO: negotiate compression parameters */ | ||
344 | probe->wKeyFrameRate = probe_min.wKeyFrameRate; | ||
345 | probe->wPFrameRate = probe_min.wPFrameRate; | ||
346 | probe->wCompQuality = probe_max.wCompQuality; | ||
347 | probe->wCompWindowSize = probe_min.wCompWindowSize; | ||
348 | } | ||
349 | |||
350 | done: | ||
351 | return ret; | ||
352 | } | ||
353 | |||
354 | int uvc_commit_video(struct uvc_streaming *stream, | ||
355 | struct uvc_streaming_control *probe) | ||
356 | { | ||
357 | return uvc_set_video_ctrl(stream, probe, 0); | ||
358 | } | ||
359 | |||
360 | /* ------------------------------------------------------------------------ | ||
361 | * Video codecs | ||
362 | */ | ||
363 | |||
364 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ | ||
365 | #define UVC_STREAM_EOH (1 << 7) | ||
366 | #define UVC_STREAM_ERR (1 << 6) | ||
367 | #define UVC_STREAM_STI (1 << 5) | ||
368 | #define UVC_STREAM_RES (1 << 4) | ||
369 | #define UVC_STREAM_SCR (1 << 3) | ||
370 | #define UVC_STREAM_PTS (1 << 2) | ||
371 | #define UVC_STREAM_EOF (1 << 1) | ||
372 | #define UVC_STREAM_FID (1 << 0) | ||
373 | |||
374 | /* Video payload decoding is handled by uvc_video_decode_start(), | ||
375 | * uvc_video_decode_data() and uvc_video_decode_end(). | ||
376 | * | ||
377 | * uvc_video_decode_start is called with URB data at the start of a bulk or | ||
378 | * isochronous payload. It processes header data and returns the header size | ||
379 | * in bytes if successful. If an error occurs, it returns a negative error | ||
380 | * code. The following error codes have special meanings. | ||
381 | * | ||
382 | * - EAGAIN informs the caller that the current video buffer should be marked | ||
383 | * as done, and that the function should be called again with the same data | ||
384 | * and a new video buffer. This is used when end of frame conditions can be | ||
385 | * reliably detected at the beginning of the next frame only. | ||
386 | * | ||
387 | * If an error other than -EAGAIN is returned, the caller will drop the current | ||
388 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | ||
389 | * made until the next payload. -ENODATA can be used to drop the current | ||
390 | * payload if no other error code is appropriate. | ||
391 | * | ||
392 | * uvc_video_decode_data is called for every URB with URB data. It copies the | ||
393 | * data to the video buffer. | ||
394 | * | ||
395 | * uvc_video_decode_end is called with header data at the end of a bulk or | ||
396 | * isochronous payload. It performs any additional header data processing and | ||
397 | * returns 0 or a negative error code if an error occurred. As header data have | ||
398 | * already been processed by uvc_video_decode_start, this functions isn't | ||
399 | * required to perform sanity checks a second time. | ||
400 | * | ||
401 | * For isochronous transfers where a payload is always transferred in a single | ||
402 | * URB, the three functions will be called in a row. | ||
403 | * | ||
404 | * To let the decoder process header data and update its internal state even | ||
405 | * when no video buffer is available, uvc_video_decode_start must be prepared | ||
406 | * to be called with a NULL buf parameter. uvc_video_decode_data and | ||
407 | * uvc_video_decode_end will never be called with a NULL buffer. | ||
408 | */ | ||
409 | static int uvc_video_decode_start(struct uvc_streaming *stream, | ||
410 | struct uvc_buffer *buf, const __u8 *data, int len) | ||
411 | { | ||
412 | __u8 fid; | ||
413 | |||
414 | /* Sanity checks: | ||
415 | * - packet must be at least 2 bytes long | ||
416 | * - bHeaderLength value must be at least 2 bytes (see above) | ||
417 | * - bHeaderLength value can't be larger than the packet size. | ||
418 | */ | ||
419 | if (len < 2 || data[0] < 2 || data[0] > len) | ||
420 | return -EINVAL; | ||
421 | |||
422 | /* Skip payloads marked with the error bit ("error frames"). */ | ||
423 | if (data[1] & UVC_STREAM_ERR) { | ||
424 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | ||
425 | "set).\n"); | ||
426 | return -ENODATA; | ||
427 | } | ||
428 | |||
429 | fid = data[1] & UVC_STREAM_FID; | ||
430 | |||
431 | /* Increase the sequence number regardless of any buffer states, so | ||
432 | * that discontinuous sequence numbers always indicate lost frames. | ||
433 | */ | ||
434 | if (stream->last_fid != fid) | ||
435 | stream->sequence++; | ||
436 | |||
437 | /* Store the payload FID bit and return immediately when the buffer is | ||
438 | * NULL. | ||
439 | */ | ||
440 | if (buf == NULL) { | ||
441 | stream->last_fid = fid; | ||
442 | return -ENODATA; | ||
443 | } | ||
444 | |||
445 | /* Synchronize to the input stream by waiting for the FID bit to be | ||
446 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | ||
447 | * stream->last_fid is initialized to -1, so the first isochronous | ||
448 | * frame will always be in sync. | ||
449 | * | ||
450 | * If the device doesn't toggle the FID bit, invert stream->last_fid | ||
451 | * when the EOF bit is set to force synchronisation on the next packet. | ||
452 | */ | ||
453 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | ||
454 | struct timespec ts; | ||
455 | |||
456 | if (fid == stream->last_fid) { | ||
457 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " | ||
458 | "sync).\n"); | ||
459 | if ((stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && | ||
460 | (data[1] & UVC_STREAM_EOF)) | ||
461 | stream->last_fid ^= UVC_STREAM_FID; | ||
462 | return -ENODATA; | ||
463 | } | ||
464 | |||
465 | if (uvc_clock_param == CLOCK_MONOTONIC) | ||
466 | ktime_get_ts(&ts); | ||
467 | else | ||
468 | ktime_get_real_ts(&ts); | ||
469 | |||
470 | buf->buf.sequence = stream->sequence; | ||
471 | buf->buf.timestamp.tv_sec = ts.tv_sec; | ||
472 | buf->buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; | ||
473 | |||
474 | /* TODO: Handle PTS and SCR. */ | ||
475 | buf->state = UVC_BUF_STATE_ACTIVE; | ||
476 | } | ||
477 | |||
478 | /* Mark the buffer as done if we're at the beginning of a new frame. | ||
479 | * End of frame detection is better implemented by checking the EOF | ||
480 | * bit (FID bit toggling is delayed by one frame compared to the EOF | ||
481 | * bit), but some devices don't set the bit at end of frame (and the | ||
482 | * last payload can be lost anyway). We thus must check if the FID has | ||
483 | * been toggled. | ||
484 | * | ||
485 | * stream->last_fid is initialized to -1, so the first isochronous | ||
486 | * frame will never trigger an end of frame detection. | ||
487 | * | ||
488 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | ||
489 | * as it doesn't make sense to return an empty buffer. This also | ||
490 | * avoids detecting end of frame conditions at FID toggling if the | ||
491 | * previous payload had the EOF bit set. | ||
492 | */ | ||
493 | if (fid != stream->last_fid && buf->buf.bytesused != 0) { | ||
494 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " | ||
495 | "toggled).\n"); | ||
496 | buf->state = UVC_BUF_STATE_READY; | ||
497 | return -EAGAIN; | ||
498 | } | ||
499 | |||
500 | stream->last_fid = fid; | ||
501 | |||
502 | return data[0]; | ||
503 | } | ||
504 | |||
505 | static void uvc_video_decode_data(struct uvc_streaming *stream, | ||
506 | struct uvc_buffer *buf, const __u8 *data, int len) | ||
507 | { | ||
508 | struct uvc_video_queue *queue = &stream->queue; | ||
509 | unsigned int maxlen, nbytes; | ||
510 | void *mem; | ||
511 | |||
512 | if (len <= 0) | ||
513 | return; | ||
514 | |||
515 | /* Copy the video data to the buffer. */ | ||
516 | maxlen = buf->buf.length - buf->buf.bytesused; | ||
517 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; | ||
518 | nbytes = min((unsigned int)len, maxlen); | ||
519 | memcpy(mem, data, nbytes); | ||
520 | buf->buf.bytesused += nbytes; | ||
521 | |||
522 | /* Complete the current frame if the buffer size was exceeded. */ | ||
523 | if (len > maxlen) { | ||
524 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | ||
525 | buf->state = UVC_BUF_STATE_READY; | ||
526 | } | ||
527 | } | ||
528 | |||
529 | static void uvc_video_decode_end(struct uvc_streaming *stream, | ||
530 | struct uvc_buffer *buf, const __u8 *data, int len) | ||
531 | { | ||
532 | /* Mark the buffer as done if the EOF marker is set. */ | ||
533 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { | ||
534 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); | ||
535 | if (data[0] == len) | ||
536 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | ||
537 | buf->state = UVC_BUF_STATE_READY; | ||
538 | if (stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) | ||
539 | stream->last_fid ^= UVC_STREAM_FID; | ||
540 | } | ||
541 | } | ||
542 | |||
543 | /* Video payload encoding is handled by uvc_video_encode_header() and | ||
544 | * uvc_video_encode_data(). Only bulk transfers are currently supported. | ||
545 | * | ||
546 | * uvc_video_encode_header is called at the start of a payload. It adds header | ||
547 | * data to the transfer buffer and returns the header size. As the only known | ||
548 | * UVC output device transfers a whole frame in a single payload, the EOF bit | ||
549 | * is always set in the header. | ||
550 | * | ||
551 | * uvc_video_encode_data is called for every URB and copies the data from the | ||
552 | * video buffer to the transfer buffer. | ||
553 | */ | ||
554 | static int uvc_video_encode_header(struct uvc_streaming *stream, | ||
555 | struct uvc_buffer *buf, __u8 *data, int len) | ||
556 | { | ||
557 | data[0] = 2; /* Header length */ | ||
558 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | ||
559 | | (stream->last_fid & UVC_STREAM_FID); | ||
560 | return 2; | ||
561 | } | ||
562 | |||
563 | static int uvc_video_encode_data(struct uvc_streaming *stream, | ||
564 | struct uvc_buffer *buf, __u8 *data, int len) | ||
565 | { | ||
566 | struct uvc_video_queue *queue = &stream->queue; | ||
567 | unsigned int nbytes; | ||
568 | void *mem; | ||
569 | |||
570 | /* Copy video data to the URB buffer. */ | ||
571 | mem = queue->mem + buf->buf.m.offset + queue->buf_used; | ||
572 | nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used); | ||
573 | nbytes = min(stream->bulk.max_payload_size - stream->bulk.payload_size, | ||
574 | nbytes); | ||
575 | memcpy(data, mem, nbytes); | ||
576 | |||
577 | queue->buf_used += nbytes; | ||
578 | |||
579 | return nbytes; | ||
580 | } | ||
581 | |||
582 | /* ------------------------------------------------------------------------ | ||
583 | * URB handling | ||
584 | */ | ||
585 | |||
586 | /* | ||
587 | * Completion handler for video URBs. | ||
588 | */ | ||
589 | static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream, | ||
590 | struct uvc_buffer *buf) | ||
591 | { | ||
592 | u8 *mem; | ||
593 | int ret, i; | ||
594 | |||
595 | for (i = 0; i < urb->number_of_packets; ++i) { | ||
596 | if (urb->iso_frame_desc[i].status < 0) { | ||
597 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | ||
598 | "lost (%d).\n", urb->iso_frame_desc[i].status); | ||
599 | /* Mark the buffer as faulty. */ | ||
600 | if (buf != NULL) | ||
601 | buf->error = 1; | ||
602 | continue; | ||
603 | } | ||
604 | |||
605 | /* Decode the payload header. */ | ||
606 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | ||
607 | do { | ||
608 | ret = uvc_video_decode_start(stream, buf, mem, | ||
609 | urb->iso_frame_desc[i].actual_length); | ||
610 | if (ret == -EAGAIN) | ||
611 | buf = uvc_queue_next_buffer(&stream->queue, | ||
612 | buf); | ||
613 | } while (ret == -EAGAIN); | ||
614 | |||
615 | if (ret < 0) | ||
616 | continue; | ||
617 | |||
618 | /* Decode the payload data. */ | ||
619 | uvc_video_decode_data(stream, buf, mem + ret, | ||
620 | urb->iso_frame_desc[i].actual_length - ret); | ||
621 | |||
622 | /* Process the header again. */ | ||
623 | uvc_video_decode_end(stream, buf, mem, | ||
624 | urb->iso_frame_desc[i].actual_length); | ||
625 | |||
626 | if (buf->state == UVC_BUF_STATE_READY) { | ||
627 | if (buf->buf.length != buf->buf.bytesused && | ||
628 | !(stream->cur_format->flags & | ||
629 | UVC_FMT_FLAG_COMPRESSED)) | ||
630 | buf->error = 1; | ||
631 | |||
632 | buf = uvc_queue_next_buffer(&stream->queue, buf); | ||
633 | } | ||
634 | } | ||
635 | } | ||
636 | |||
637 | static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream, | ||
638 | struct uvc_buffer *buf) | ||
639 | { | ||
640 | u8 *mem; | ||
641 | int len, ret; | ||
642 | |||
643 | if (urb->actual_length == 0) | ||
644 | return; | ||
645 | |||
646 | mem = urb->transfer_buffer; | ||
647 | len = urb->actual_length; | ||
648 | stream->bulk.payload_size += len; | ||
649 | |||
650 | /* If the URB is the first of its payload, decode and save the | ||
651 | * header. | ||
652 | */ | ||
653 | if (stream->bulk.header_size == 0 && !stream->bulk.skip_payload) { | ||
654 | do { | ||
655 | ret = uvc_video_decode_start(stream, buf, mem, len); | ||
656 | if (ret == -EAGAIN) | ||
657 | buf = uvc_queue_next_buffer(&stream->queue, | ||
658 | buf); | ||
659 | } while (ret == -EAGAIN); | ||
660 | |||
661 | /* If an error occurred skip the rest of the payload. */ | ||
662 | if (ret < 0 || buf == NULL) { | ||
663 | stream->bulk.skip_payload = 1; | ||
664 | } else { | ||
665 | memcpy(stream->bulk.header, mem, ret); | ||
666 | stream->bulk.header_size = ret; | ||
667 | |||
668 | mem += ret; | ||
669 | len -= ret; | ||
670 | } | ||
671 | } | ||
672 | |||
673 | /* The buffer queue might have been cancelled while a bulk transfer | ||
674 | * was in progress, so we can reach here with buf equal to NULL. Make | ||
675 | * sure buf is never dereferenced if NULL. | ||
676 | */ | ||
677 | |||
678 | /* Process video data. */ | ||
679 | if (!stream->bulk.skip_payload && buf != NULL) | ||
680 | uvc_video_decode_data(stream, buf, mem, len); | ||
681 | |||
682 | /* Detect the payload end by a URB smaller than the maximum size (or | ||
683 | * a payload size equal to the maximum) and process the header again. | ||
684 | */ | ||
685 | if (urb->actual_length < urb->transfer_buffer_length || | ||
686 | stream->bulk.payload_size >= stream->bulk.max_payload_size) { | ||
687 | if (!stream->bulk.skip_payload && buf != NULL) { | ||
688 | uvc_video_decode_end(stream, buf, stream->bulk.header, | ||
689 | stream->bulk.payload_size); | ||
690 | if (buf->state == UVC_BUF_STATE_READY) | ||
691 | buf = uvc_queue_next_buffer(&stream->queue, | ||
692 | buf); | ||
693 | } | ||
694 | |||
695 | stream->bulk.header_size = 0; | ||
696 | stream->bulk.skip_payload = 0; | ||
697 | stream->bulk.payload_size = 0; | ||
698 | } | ||
699 | } | ||
700 | |||
701 | static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream, | ||
702 | struct uvc_buffer *buf) | ||
703 | { | ||
704 | u8 *mem = urb->transfer_buffer; | ||
705 | int len = stream->urb_size, ret; | ||
706 | |||
707 | if (buf == NULL) { | ||
708 | urb->transfer_buffer_length = 0; | ||
709 | return; | ||
710 | } | ||
711 | |||
712 | /* If the URB is the first of its payload, add the header. */ | ||
713 | if (stream->bulk.header_size == 0) { | ||
714 | ret = uvc_video_encode_header(stream, buf, mem, len); | ||
715 | stream->bulk.header_size = ret; | ||
716 | stream->bulk.payload_size += ret; | ||
717 | mem += ret; | ||
718 | len -= ret; | ||
719 | } | ||
720 | |||
721 | /* Process video data. */ | ||
722 | ret = uvc_video_encode_data(stream, buf, mem, len); | ||
723 | |||
724 | stream->bulk.payload_size += ret; | ||
725 | len -= ret; | ||
726 | |||
727 | if (buf->buf.bytesused == stream->queue.buf_used || | ||
728 | stream->bulk.payload_size == stream->bulk.max_payload_size) { | ||
729 | if (buf->buf.bytesused == stream->queue.buf_used) { | ||
730 | stream->queue.buf_used = 0; | ||
731 | buf->state = UVC_BUF_STATE_READY; | ||
732 | buf->buf.sequence = ++stream->sequence; | ||
733 | uvc_queue_next_buffer(&stream->queue, buf); | ||
734 | stream->last_fid ^= UVC_STREAM_FID; | ||
735 | } | ||
736 | |||
737 | stream->bulk.header_size = 0; | ||
738 | stream->bulk.payload_size = 0; | ||
739 | } | ||
740 | |||
741 | urb->transfer_buffer_length = stream->urb_size - len; | ||
742 | } | ||
743 | |||
744 | static void uvc_video_complete(struct urb *urb) | ||
745 | { | ||
746 | struct uvc_streaming *stream = urb->context; | ||
747 | struct uvc_video_queue *queue = &stream->queue; | ||
748 | struct uvc_buffer *buf = NULL; | ||
749 | unsigned long flags; | ||
750 | int ret; | ||
751 | |||
752 | switch (urb->status) { | ||
753 | case 0: | ||
754 | break; | ||
755 | |||
756 | default: | ||
757 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | ||
758 | "completion handler.\n", urb->status); | ||
759 | |||
760 | case -ENOENT: /* usb_kill_urb() called. */ | ||
761 | if (stream->frozen) | ||
762 | return; | ||
763 | |||
764 | case -ECONNRESET: /* usb_unlink_urb() called. */ | ||
765 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | ||
766 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | ||
767 | return; | ||
768 | } | ||
769 | |||
770 | spin_lock_irqsave(&queue->irqlock, flags); | ||
771 | if (!list_empty(&queue->irqqueue)) | ||
772 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | ||
773 | queue); | ||
774 | spin_unlock_irqrestore(&queue->irqlock, flags); | ||
775 | |||
776 | stream->decode(urb, stream, buf); | ||
777 | |||
778 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | ||
779 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | ||
780 | ret); | ||
781 | } | ||
782 | } | ||
783 | |||
784 | /* | ||
785 | * Free transfer buffers. | ||
786 | */ | ||
787 | static void uvc_free_urb_buffers(struct uvc_streaming *stream) | ||
788 | { | ||
789 | unsigned int i; | ||
790 | |||
791 | for (i = 0; i < UVC_URBS; ++i) { | ||
792 | if (stream->urb_buffer[i]) { | ||
793 | usb_free_coherent(stream->dev->udev, stream->urb_size, | ||
794 | stream->urb_buffer[i], stream->urb_dma[i]); | ||
795 | stream->urb_buffer[i] = NULL; | ||
796 | } | ||
797 | } | ||
798 | |||
799 | stream->urb_size = 0; | ||
800 | } | ||
801 | |||
802 | /* | ||
803 | * Allocate transfer buffers. This function can be called with buffers | ||
804 | * already allocated when resuming from suspend, in which case it will | ||
805 | * return without touching the buffers. | ||
806 | * | ||
807 | * Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the | ||
808 | * system is too low on memory try successively smaller numbers of packets | ||
809 | * until allocation succeeds. | ||
810 | * | ||
811 | * Return the number of allocated packets on success or 0 when out of memory. | ||
812 | */ | ||
813 | static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, | ||
814 | unsigned int size, unsigned int psize, gfp_t gfp_flags) | ||
815 | { | ||
816 | unsigned int npackets; | ||
817 | unsigned int i; | ||
818 | |||
819 | /* Buffers are already allocated, bail out. */ | ||
820 | if (stream->urb_size) | ||
821 | return stream->urb_size / psize; | ||
822 | |||
823 | /* Compute the number of packets. Bulk endpoints might transfer UVC | ||
824 | * payloads across multiple URBs. | ||
825 | */ | ||
826 | npackets = DIV_ROUND_UP(size, psize); | ||
827 | if (npackets > UVC_MAX_PACKETS) | ||
828 | npackets = UVC_MAX_PACKETS; | ||
829 | |||
830 | /* Retry allocations until one succeed. */ | ||
831 | for (; npackets > 1; npackets /= 2) { | ||
832 | for (i = 0; i < UVC_URBS; ++i) { | ||
833 | stream->urb_size = psize * npackets; | ||
834 | stream->urb_buffer[i] = usb_alloc_coherent( | ||
835 | stream->dev->udev, stream->urb_size, | ||
836 | gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]); | ||
837 | if (!stream->urb_buffer[i]) { | ||
838 | uvc_free_urb_buffers(stream); | ||
839 | break; | ||
840 | } | ||
841 | } | ||
842 | |||
843 | if (i == UVC_URBS) { | ||
844 | uvc_trace(UVC_TRACE_VIDEO, "Allocated %u URB buffers " | ||
845 | "of %ux%u bytes each.\n", UVC_URBS, npackets, | ||
846 | psize); | ||
847 | return npackets; | ||
848 | } | ||
849 | } | ||
850 | |||
851 | uvc_trace(UVC_TRACE_VIDEO, "Failed to allocate URB buffers (%u bytes " | ||
852 | "per packet).\n", psize); | ||
853 | return 0; | ||
854 | } | ||
855 | |||
856 | /* | ||
857 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | ||
858 | */ | ||
859 | static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) | ||
860 | { | ||
861 | struct urb *urb; | ||
862 | unsigned int i; | ||
863 | |||
864 | for (i = 0; i < UVC_URBS; ++i) { | ||
865 | urb = stream->urb[i]; | ||
866 | if (urb == NULL) | ||
867 | continue; | ||
868 | |||
869 | usb_kill_urb(urb); | ||
870 | usb_free_urb(urb); | ||
871 | stream->urb[i] = NULL; | ||
872 | } | ||
873 | |||
874 | if (free_buffers) | ||
875 | uvc_free_urb_buffers(stream); | ||
876 | } | ||
877 | |||
878 | /* | ||
879 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | ||
880 | * is given by the endpoint. | ||
881 | */ | ||
882 | static int uvc_init_video_isoc(struct uvc_streaming *stream, | ||
883 | struct usb_host_endpoint *ep, gfp_t gfp_flags) | ||
884 | { | ||
885 | struct urb *urb; | ||
886 | unsigned int npackets, i, j; | ||
887 | u16 psize; | ||
888 | u32 size; | ||
889 | |||
890 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | ||
891 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | ||
892 | size = stream->ctrl.dwMaxVideoFrameSize; | ||
893 | |||
894 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); | ||
895 | if (npackets == 0) | ||
896 | return -ENOMEM; | ||
897 | |||
898 | size = npackets * psize; | ||
899 | |||
900 | for (i = 0; i < UVC_URBS; ++i) { | ||
901 | urb = usb_alloc_urb(npackets, gfp_flags); | ||
902 | if (urb == NULL) { | ||
903 | uvc_uninit_video(stream, 1); | ||
904 | return -ENOMEM; | ||
905 | } | ||
906 | |||
907 | urb->dev = stream->dev->udev; | ||
908 | urb->context = stream; | ||
909 | urb->pipe = usb_rcvisocpipe(stream->dev->udev, | ||
910 | ep->desc.bEndpointAddress); | ||
911 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | ||
912 | urb->interval = ep->desc.bInterval; | ||
913 | urb->transfer_buffer = stream->urb_buffer[i]; | ||
914 | urb->transfer_dma = stream->urb_dma[i]; | ||
915 | urb->complete = uvc_video_complete; | ||
916 | urb->number_of_packets = npackets; | ||
917 | urb->transfer_buffer_length = size; | ||
918 | |||
919 | for (j = 0; j < npackets; ++j) { | ||
920 | urb->iso_frame_desc[j].offset = j * psize; | ||
921 | urb->iso_frame_desc[j].length = psize; | ||
922 | } | ||
923 | |||
924 | stream->urb[i] = urb; | ||
925 | } | ||
926 | |||
927 | return 0; | ||
928 | } | ||
929 | |||
930 | /* | ||
931 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | ||
932 | * given by the endpoint. | ||
933 | */ | ||
934 | static int uvc_init_video_bulk(struct uvc_streaming *stream, | ||
935 | struct usb_host_endpoint *ep, gfp_t gfp_flags) | ||
936 | { | ||
937 | struct urb *urb; | ||
938 | unsigned int npackets, pipe, i; | ||
939 | u16 psize; | ||
940 | u32 size; | ||
941 | |||
942 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; | ||
943 | size = stream->ctrl.dwMaxPayloadTransferSize; | ||
944 | stream->bulk.max_payload_size = size; | ||
945 | |||
946 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); | ||
947 | if (npackets == 0) | ||
948 | return -ENOMEM; | ||
949 | |||
950 | size = npackets * psize; | ||
951 | |||
952 | if (usb_endpoint_dir_in(&ep->desc)) | ||
953 | pipe = usb_rcvbulkpipe(stream->dev->udev, | ||
954 | ep->desc.bEndpointAddress); | ||
955 | else | ||
956 | pipe = usb_sndbulkpipe(stream->dev->udev, | ||
957 | ep->desc.bEndpointAddress); | ||
958 | |||
959 | if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) | ||
960 | size = 0; | ||
961 | |||
962 | for (i = 0; i < UVC_URBS; ++i) { | ||
963 | urb = usb_alloc_urb(0, gfp_flags); | ||
964 | if (urb == NULL) { | ||
965 | uvc_uninit_video(stream, 1); | ||
966 | return -ENOMEM; | ||
967 | } | ||
968 | |||
969 | usb_fill_bulk_urb(urb, stream->dev->udev, pipe, | ||
970 | stream->urb_buffer[i], size, uvc_video_complete, | ||
971 | stream); | ||
972 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; | ||
973 | urb->transfer_dma = stream->urb_dma[i]; | ||
974 | |||
975 | stream->urb[i] = urb; | ||
976 | } | ||
977 | |||
978 | return 0; | ||
979 | } | ||
980 | |||
981 | /* | ||
982 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | ||
983 | */ | ||
984 | static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags) | ||
985 | { | ||
986 | struct usb_interface *intf = stream->intf; | ||
987 | struct usb_host_endpoint *ep; | ||
988 | unsigned int i; | ||
989 | int ret; | ||
990 | |||
991 | stream->sequence = -1; | ||
992 | stream->last_fid = -1; | ||
993 | stream->bulk.header_size = 0; | ||
994 | stream->bulk.skip_payload = 0; | ||
995 | stream->bulk.payload_size = 0; | ||
996 | |||
997 | if (intf->num_altsetting > 1) { | ||
998 | struct usb_host_endpoint *best_ep = NULL; | ||
999 | unsigned int best_psize = 3 * 1024; | ||
1000 | unsigned int bandwidth; | ||
1001 | unsigned int uninitialized_var(altsetting); | ||
1002 | int intfnum = stream->intfnum; | ||
1003 | |||
1004 | /* Isochronous endpoint, select the alternate setting. */ | ||
1005 | bandwidth = stream->ctrl.dwMaxPayloadTransferSize; | ||
1006 | |||
1007 | if (bandwidth == 0) { | ||
1008 | uvc_trace(UVC_TRACE_VIDEO, "Device requested null " | ||
1009 | "bandwidth, defaulting to lowest.\n"); | ||
1010 | bandwidth = 1; | ||
1011 | } else { | ||
1012 | uvc_trace(UVC_TRACE_VIDEO, "Device requested %u " | ||
1013 | "B/frame bandwidth.\n", bandwidth); | ||
1014 | } | ||
1015 | |||
1016 | for (i = 0; i < intf->num_altsetting; ++i) { | ||
1017 | struct usb_host_interface *alts; | ||
1018 | unsigned int psize; | ||
1019 | |||
1020 | alts = &intf->altsetting[i]; | ||
1021 | ep = uvc_find_endpoint(alts, | ||
1022 | stream->header.bEndpointAddress); | ||
1023 | if (ep == NULL) | ||
1024 | continue; | ||
1025 | |||
1026 | /* Check if the bandwidth is high enough. */ | ||
1027 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | ||
1028 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | ||
1029 | if (psize >= bandwidth && psize <= best_psize) { | ||
1030 | altsetting = i; | ||
1031 | best_psize = psize; | ||
1032 | best_ep = ep; | ||
1033 | } | ||
1034 | } | ||
1035 | |||
1036 | if (best_ep == NULL) { | ||
1037 | uvc_trace(UVC_TRACE_VIDEO, "No fast enough alt setting " | ||
1038 | "for requested bandwidth.\n"); | ||
1039 | return -EIO; | ||
1040 | } | ||
1041 | |||
1042 | uvc_trace(UVC_TRACE_VIDEO, "Selecting alternate setting %u " | ||
1043 | "(%u B/frame bandwidth).\n", altsetting, best_psize); | ||
1044 | |||
1045 | ret = usb_set_interface(stream->dev->udev, intfnum, altsetting); | ||
1046 | if (ret < 0) | ||
1047 | return ret; | ||
1048 | |||
1049 | ret = uvc_init_video_isoc(stream, best_ep, gfp_flags); | ||
1050 | } else { | ||
1051 | /* Bulk endpoint, proceed to URB initialization. */ | ||
1052 | ep = uvc_find_endpoint(&intf->altsetting[0], | ||
1053 | stream->header.bEndpointAddress); | ||
1054 | if (ep == NULL) | ||
1055 | return -EIO; | ||
1056 | |||
1057 | ret = uvc_init_video_bulk(stream, ep, gfp_flags); | ||
1058 | } | ||
1059 | |||
1060 | if (ret < 0) | ||
1061 | return ret; | ||
1062 | |||
1063 | /* Submit the URBs. */ | ||
1064 | for (i = 0; i < UVC_URBS; ++i) { | ||
1065 | ret = usb_submit_urb(stream->urb[i], gfp_flags); | ||
1066 | if (ret < 0) { | ||
1067 | uvc_printk(KERN_ERR, "Failed to submit URB %u " | ||
1068 | "(%d).\n", i, ret); | ||
1069 | uvc_uninit_video(stream, 1); | ||
1070 | return ret; | ||
1071 | } | ||
1072 | } | ||
1073 | |||
1074 | return 0; | ||
1075 | } | ||
1076 | |||
1077 | /* -------------------------------------------------------------------------- | ||
1078 | * Suspend/resume | ||
1079 | */ | ||
1080 | |||
1081 | /* | ||
1082 | * Stop streaming without disabling the video queue. | ||
1083 | * | ||
1084 | * To let userspace applications resume without trouble, we must not touch the | ||
1085 | * video buffers in any way. We mark the device as frozen to make sure the URB | ||
1086 | * completion handler won't try to cancel the queue when we kill the URBs. | ||
1087 | */ | ||
1088 | int uvc_video_suspend(struct uvc_streaming *stream) | ||
1089 | { | ||
1090 | if (!uvc_queue_streaming(&stream->queue)) | ||
1091 | return 0; | ||
1092 | |||
1093 | stream->frozen = 1; | ||
1094 | uvc_uninit_video(stream, 0); | ||
1095 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | ||
1096 | return 0; | ||
1097 | } | ||
1098 | |||
1099 | /* | ||
1100 | * Reconfigure the video interface and restart streaming if it was enabled | ||
1101 | * before suspend. | ||
1102 | * | ||
1103 | * If an error occurs, disable the video queue. This will wake all pending | ||
1104 | * buffers, making sure userspace applications are notified of the problem | ||
1105 | * instead of waiting forever. | ||
1106 | */ | ||
1107 | int uvc_video_resume(struct uvc_streaming *stream, int reset) | ||
1108 | { | ||
1109 | int ret; | ||
1110 | |||
1111 | /* If the bus has been reset on resume, set the alternate setting to 0. | ||
1112 | * This should be the default value, but some devices crash or otherwise | ||
1113 | * misbehave if they don't receive a SET_INTERFACE request before any | ||
1114 | * other video control request. | ||
1115 | */ | ||
1116 | if (reset) | ||
1117 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | ||
1118 | |||
1119 | stream->frozen = 0; | ||
1120 | |||
1121 | ret = uvc_commit_video(stream, &stream->ctrl); | ||
1122 | if (ret < 0) { | ||
1123 | uvc_queue_enable(&stream->queue, 0); | ||
1124 | return ret; | ||
1125 | } | ||
1126 | |||
1127 | if (!uvc_queue_streaming(&stream->queue)) | ||
1128 | return 0; | ||
1129 | |||
1130 | ret = uvc_init_video(stream, GFP_NOIO); | ||
1131 | if (ret < 0) | ||
1132 | uvc_queue_enable(&stream->queue, 0); | ||
1133 | |||
1134 | return ret; | ||
1135 | } | ||
1136 | |||
1137 | /* ------------------------------------------------------------------------ | ||
1138 | * Video device | ||
1139 | */ | ||
1140 | |||
1141 | /* | ||
1142 | * Initialize the UVC video device by switching to alternate setting 0 and | ||
1143 | * retrieve the default format. | ||
1144 | * | ||
1145 | * Some cameras (namely the Fuji Finepix) set the format and frame | ||
1146 | * indexes to zero. The UVC standard doesn't clearly make this a spec | ||
1147 | * violation, so try to silently fix the values if possible. | ||
1148 | * | ||
1149 | * This function is called before registering the device with V4L. | ||
1150 | */ | ||
1151 | int uvc_video_init(struct uvc_streaming *stream) | ||
1152 | { | ||
1153 | struct uvc_streaming_control *probe = &stream->ctrl; | ||
1154 | struct uvc_format *format = NULL; | ||
1155 | struct uvc_frame *frame = NULL; | ||
1156 | unsigned int i; | ||
1157 | int ret; | ||
1158 | |||
1159 | if (stream->nformats == 0) { | ||
1160 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); | ||
1161 | return -EINVAL; | ||
1162 | } | ||
1163 | |||
1164 | atomic_set(&stream->active, 0); | ||
1165 | |||
1166 | /* Initialize the video buffers queue. */ | ||
1167 | uvc_queue_init(&stream->queue, stream->type, !uvc_no_drop_param); | ||
1168 | |||
1169 | /* Alternate setting 0 should be the default, yet the XBox Live Vision | ||
1170 | * Cam (and possibly other devices) crash or otherwise misbehave if | ||
1171 | * they don't receive a SET_INTERFACE request before any other video | ||
1172 | * control request. | ||
1173 | */ | ||
1174 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | ||
1175 | |||
1176 | /* Set the streaming probe control with default streaming parameters | ||
1177 | * retrieved from the device. Webcams that don't suport GET_DEF | ||
1178 | * requests on the probe control will just keep their current streaming | ||
1179 | * parameters. | ||
1180 | */ | ||
1181 | if (uvc_get_video_ctrl(stream, probe, 1, UVC_GET_DEF) == 0) | ||
1182 | uvc_set_video_ctrl(stream, probe, 1); | ||
1183 | |||
1184 | /* Initialize the streaming parameters with the probe control current | ||
1185 | * value. This makes sure SET_CUR requests on the streaming commit | ||
1186 | * control will always use values retrieved from a successful GET_CUR | ||
1187 | * request on the probe control, as required by the UVC specification. | ||
1188 | */ | ||
1189 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); | ||
1190 | if (ret < 0) | ||
1191 | return ret; | ||
1192 | |||
1193 | /* Check if the default format descriptor exists. Use the first | ||
1194 | * available format otherwise. | ||
1195 | */ | ||
1196 | for (i = stream->nformats; i > 0; --i) { | ||
1197 | format = &stream->format[i-1]; | ||
1198 | if (format->index == probe->bFormatIndex) | ||
1199 | break; | ||
1200 | } | ||
1201 | |||
1202 | if (format->nframes == 0) { | ||
1203 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | ||
1204 | "default format.\n"); | ||
1205 | return -EINVAL; | ||
1206 | } | ||
1207 | |||
1208 | /* Zero bFrameIndex might be correct. Stream-based formats (including | ||
1209 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | ||
1210 | * descriptor with bFrameIndex set to zero. If the default frame | ||
1211 | * descriptor is not found, use the first available frame. | ||
1212 | */ | ||
1213 | for (i = format->nframes; i > 0; --i) { | ||
1214 | frame = &format->frame[i-1]; | ||
1215 | if (frame->bFrameIndex == probe->bFrameIndex) | ||
1216 | break; | ||
1217 | } | ||
1218 | |||
1219 | probe->bFormatIndex = format->index; | ||
1220 | probe->bFrameIndex = frame->bFrameIndex; | ||
1221 | |||
1222 | stream->cur_format = format; | ||
1223 | stream->cur_frame = frame; | ||
1224 | |||
1225 | /* Select the video decoding function */ | ||
1226 | if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { | ||
1227 | if (stream->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | ||
1228 | stream->decode = uvc_video_decode_isight; | ||
1229 | else if (stream->intf->num_altsetting > 1) | ||
1230 | stream->decode = uvc_video_decode_isoc; | ||
1231 | else | ||
1232 | stream->decode = uvc_video_decode_bulk; | ||
1233 | } else { | ||
1234 | if (stream->intf->num_altsetting == 1) | ||
1235 | stream->decode = uvc_video_encode_bulk; | ||
1236 | else { | ||
1237 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | ||
1238 | "supported for video output devices.\n"); | ||
1239 | return -EINVAL; | ||
1240 | } | ||
1241 | } | ||
1242 | |||
1243 | return 0; | ||
1244 | } | ||
1245 | |||
1246 | /* | ||
1247 | * Enable or disable the video stream. | ||
1248 | */ | ||
1249 | int uvc_video_enable(struct uvc_streaming *stream, int enable) | ||
1250 | { | ||
1251 | int ret; | ||
1252 | |||
1253 | if (!enable) { | ||
1254 | uvc_uninit_video(stream, 1); | ||
1255 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | ||
1256 | uvc_queue_enable(&stream->queue, 0); | ||
1257 | return 0; | ||
1258 | } | ||
1259 | |||
1260 | ret = uvc_queue_enable(&stream->queue, 1); | ||
1261 | if (ret < 0) | ||
1262 | return ret; | ||
1263 | |||
1264 | /* Commit the streaming parameters. */ | ||
1265 | ret = uvc_commit_video(stream, &stream->ctrl); | ||
1266 | if (ret < 0) { | ||
1267 | uvc_queue_enable(&stream->queue, 0); | ||
1268 | return ret; | ||
1269 | } | ||
1270 | |||
1271 | return uvc_init_video(stream, GFP_KERNEL); | ||
1272 | } | ||
1273 | |||