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c0efd232 LP |
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> | |
c0efd232 LP |
15 | #include <linux/list.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/usb.h> | |
18 | #include <linux/videodev2.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/wait.h> | |
21 | #include <asm/atomic.h> | |
22 | #include <asm/unaligned.h> | |
23 | ||
24 | #include <media/v4l2-common.h> | |
25 | ||
26 | #include "uvcvideo.h" | |
27 | ||
28 | /* ------------------------------------------------------------------------ | |
29 | * UVC Controls | |
30 | */ | |
31 | ||
32 | static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, | |
33 | __u8 intfnum, __u8 cs, void *data, __u16 size, | |
34 | int timeout) | |
35 | { | |
36 | __u8 type = USB_TYPE_CLASS | USB_RECIP_INTERFACE; | |
37 | unsigned int pipe; | |
c0efd232 LP |
38 | |
39 | pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0) | |
40 | : usb_sndctrlpipe(dev->udev, 0); | |
41 | type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT; | |
42 | ||
44f0079e | 43 | return usb_control_msg(dev->udev, pipe, query, type, cs << 8, |
c0efd232 | 44 | unit << 8 | intfnum, data, size, timeout); |
44f0079e LP |
45 | } |
46 | ||
47 | int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, | |
48 | __u8 intfnum, __u8 cs, void *data, __u16 size) | |
49 | { | |
50 | int ret; | |
c0efd232 | 51 | |
44f0079e LP |
52 | ret = __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, |
53 | UVC_CTRL_CONTROL_TIMEOUT); | |
c0efd232 LP |
54 | if (ret != size) { |
55 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u " | |
56 | "(unit %u) : %d (exp. %u).\n", query, cs, unit, ret, | |
57 | size); | |
58 | return -EIO; | |
59 | } | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
c0efd232 LP |
64 | static void uvc_fixup_buffer_size(struct uvc_video_device *video, |
65 | struct uvc_streaming_control *ctrl) | |
66 | { | |
67 | struct uvc_format *format; | |
68 | struct uvc_frame *frame; | |
69 | ||
70 | if (ctrl->bFormatIndex <= 0 || | |
71 | ctrl->bFormatIndex > video->streaming->nformats) | |
72 | return; | |
73 | ||
74 | format = &video->streaming->format[ctrl->bFormatIndex - 1]; | |
75 | ||
76 | if (ctrl->bFrameIndex <= 0 || | |
77 | ctrl->bFrameIndex > format->nframes) | |
78 | return; | |
79 | ||
80 | frame = &format->frame[ctrl->bFrameIndex - 1]; | |
81 | ||
82 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || | |
83 | (ctrl->dwMaxVideoFrameSize == 0 && | |
84 | video->dev->uvc_version < 0x0110)) | |
85 | ctrl->dwMaxVideoFrameSize = | |
86 | frame->dwMaxVideoFrameBufferSize; | |
87 | } | |
88 | ||
89 | static int uvc_get_video_ctrl(struct uvc_video_device *video, | |
90 | struct uvc_streaming_control *ctrl, int probe, __u8 query) | |
91 | { | |
04793dd0 LP |
92 | __u8 *data; |
93 | __u16 size; | |
c0efd232 LP |
94 | int ret; |
95 | ||
96 | size = video->dev->uvc_version >= 0x0110 ? 34 : 26; | |
04793dd0 LP |
97 | data = kmalloc(size, GFP_KERNEL); |
98 | if (data == NULL) | |
99 | return -ENOMEM; | |
100 | ||
c0efd232 | 101 | ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum, |
04793dd0 | 102 | probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size, |
c0efd232 | 103 | UVC_CTRL_STREAMING_TIMEOUT); |
44f0079e LP |
104 | |
105 | if ((query == GET_MIN || query == GET_MAX) && ret == 2) { | |
106 | /* Some cameras, mostly based on Bison Electronics chipsets, | |
107 | * answer a GET_MIN or GET_MAX request with the wCompQuality | |
108 | * field only. | |
109 | */ | |
110 | uvc_warn_once(video->dev, UVC_WARN_MINMAX, "UVC non " | |
111 | "compliance - GET_MIN/MAX(PROBE) incorrectly " | |
112 | "supported. Enabling workaround.\n"); | |
113 | memset(ctrl, 0, sizeof ctrl); | |
114 | ctrl->wCompQuality = le16_to_cpup((__le16 *)data); | |
115 | ret = 0; | |
04793dd0 | 116 | goto out; |
44f0079e LP |
117 | } else if (query == GET_DEF && probe == 1) { |
118 | /* Many cameras don't support the GET_DEF request on their | |
119 | * video probe control. Warn once and return, the caller will | |
120 | * fall back to GET_CUR. | |
121 | */ | |
122 | uvc_warn_once(video->dev, UVC_WARN_PROBE_DEF, "UVC non " | |
123 | "compliance - GET_DEF(PROBE) not supported. " | |
124 | "Enabling workaround.\n"); | |
125 | ret = -EIO; | |
126 | goto out; | |
127 | } else if (ret != size) { | |
128 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : " | |
129 | "%d (exp. %u).\n", query, probe ? "probe" : "commit", | |
130 | ret, size); | |
131 | ret = -EIO; | |
132 | goto out; | |
133 | } | |
c0efd232 LP |
134 | |
135 | ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); | |
136 | ctrl->bFormatIndex = data[2]; | |
137 | ctrl->bFrameIndex = data[3]; | |
138 | ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]); | |
139 | ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]); | |
140 | ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]); | |
141 | ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]); | |
142 | ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]); | |
143 | ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]); | |
4d3939f6 LP |
144 | ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]); |
145 | ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]); | |
c0efd232 LP |
146 | |
147 | if (size == 34) { | |
4d3939f6 | 148 | ctrl->dwClockFrequency = get_unaligned_le32(&data[26]); |
c0efd232 LP |
149 | ctrl->bmFramingInfo = data[30]; |
150 | ctrl->bPreferedVersion = data[31]; | |
151 | ctrl->bMinVersion = data[32]; | |
152 | ctrl->bMaxVersion = data[33]; | |
153 | } else { | |
154 | ctrl->dwClockFrequency = video->dev->clock_frequency; | |
155 | ctrl->bmFramingInfo = 0; | |
156 | ctrl->bPreferedVersion = 0; | |
157 | ctrl->bMinVersion = 0; | |
158 | ctrl->bMaxVersion = 0; | |
159 | } | |
160 | ||
161 | /* Some broken devices return a null or wrong dwMaxVideoFrameSize. | |
162 | * Try to get the value from the format and frame descriptor. | |
163 | */ | |
164 | uvc_fixup_buffer_size(video, ctrl); | |
44f0079e | 165 | ret = 0; |
c0efd232 | 166 | |
04793dd0 LP |
167 | out: |
168 | kfree(data); | |
169 | return ret; | |
c0efd232 LP |
170 | } |
171 | ||
44f0079e | 172 | static int uvc_set_video_ctrl(struct uvc_video_device *video, |
c0efd232 LP |
173 | struct uvc_streaming_control *ctrl, int probe) |
174 | { | |
04793dd0 LP |
175 | __u8 *data; |
176 | __u16 size; | |
177 | int ret; | |
c0efd232 LP |
178 | |
179 | size = video->dev->uvc_version >= 0x0110 ? 34 : 26; | |
04793dd0 LP |
180 | data = kzalloc(size, GFP_KERNEL); |
181 | if (data == NULL) | |
182 | return -ENOMEM; | |
c0efd232 LP |
183 | |
184 | *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint); | |
185 | data[2] = ctrl->bFormatIndex; | |
186 | data[3] = ctrl->bFrameIndex; | |
187 | *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval); | |
188 | *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate); | |
189 | *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate); | |
190 | *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality); | |
191 | *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize); | |
192 | *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay); | |
193 | /* Note: Some of the fields below are not required for IN devices (see | |
194 | * UVC spec, 4.3.1.1), but we still copy them in case support for OUT | |
195 | * devices is added in the future. */ | |
4d3939f6 LP |
196 | put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]); |
197 | put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]); | |
c0efd232 LP |
198 | |
199 | if (size == 34) { | |
4d3939f6 | 200 | put_unaligned_le32(ctrl->dwClockFrequency, &data[26]); |
c0efd232 LP |
201 | data[30] = ctrl->bmFramingInfo; |
202 | data[31] = ctrl->bPreferedVersion; | |
203 | data[32] = ctrl->bMinVersion; | |
204 | data[33] = ctrl->bMaxVersion; | |
205 | } | |
206 | ||
04793dd0 | 207 | ret = __uvc_query_ctrl(video->dev, SET_CUR, 0, |
c0efd232 | 208 | video->streaming->intfnum, |
04793dd0 | 209 | probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size, |
c0efd232 | 210 | UVC_CTRL_STREAMING_TIMEOUT); |
44f0079e LP |
211 | if (ret != size) { |
212 | uvc_printk(KERN_ERR, "Failed to set UVC %s control : " | |
213 | "%d (exp. %u).\n", probe ? "probe" : "commit", | |
214 | ret, size); | |
215 | ret = -EIO; | |
216 | } | |
04793dd0 LP |
217 | |
218 | kfree(data); | |
219 | return ret; | |
c0efd232 LP |
220 | } |
221 | ||
222 | int uvc_probe_video(struct uvc_video_device *video, | |
223 | struct uvc_streaming_control *probe) | |
224 | { | |
225 | struct uvc_streaming_control probe_min, probe_max; | |
226 | __u16 bandwidth; | |
227 | unsigned int i; | |
228 | int ret; | |
229 | ||
230 | mutex_lock(&video->streaming->mutex); | |
231 | ||
232 | /* Perform probing. The device should adjust the requested values | |
233 | * according to its capabilities. However, some devices, namely the | |
234 | * first generation UVC Logitech webcams, don't implement the Video | |
235 | * Probe control properly, and just return the needed bandwidth. For | |
236 | * that reason, if the needed bandwidth exceeds the maximum available | |
237 | * bandwidth, try to lower the quality. | |
238 | */ | |
239 | if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0) | |
240 | goto done; | |
241 | ||
242 | /* Get the minimum and maximum values for compression settings. */ | |
243 | if (!(video->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { | |
244 | ret = uvc_get_video_ctrl(video, &probe_min, 1, GET_MIN); | |
245 | if (ret < 0) | |
246 | goto done; | |
247 | ret = uvc_get_video_ctrl(video, &probe_max, 1, GET_MAX); | |
248 | if (ret < 0) | |
249 | goto done; | |
250 | ||
251 | probe->wCompQuality = probe_max.wCompQuality; | |
252 | } | |
253 | ||
254 | for (i = 0; i < 2; ++i) { | |
255 | if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0 || | |
256 | (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) | |
257 | goto done; | |
258 | ||
259 | if (video->streaming->intf->num_altsetting == 1) | |
260 | break; | |
261 | ||
262 | bandwidth = probe->dwMaxPayloadTransferSize; | |
263 | if (bandwidth <= video->streaming->maxpsize) | |
264 | break; | |
265 | ||
266 | if (video->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { | |
267 | ret = -ENOSPC; | |
268 | goto done; | |
269 | } | |
270 | ||
271 | /* TODO: negotiate compression parameters */ | |
272 | probe->wKeyFrameRate = probe_min.wKeyFrameRate; | |
273 | probe->wPFrameRate = probe_min.wPFrameRate; | |
274 | probe->wCompQuality = probe_max.wCompQuality; | |
275 | probe->wCompWindowSize = probe_min.wCompWindowSize; | |
276 | } | |
277 | ||
278 | done: | |
279 | mutex_unlock(&video->streaming->mutex); | |
280 | return ret; | |
281 | } | |
282 | ||
44f0079e LP |
283 | int uvc_commit_video(struct uvc_video_device *video, |
284 | struct uvc_streaming_control *probe) | |
285 | { | |
286 | return uvc_set_video_ctrl(video, probe, 0); | |
287 | } | |
288 | ||
c0efd232 LP |
289 | /* ------------------------------------------------------------------------ |
290 | * Video codecs | |
291 | */ | |
292 | ||
293 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ | |
294 | #define UVC_STREAM_EOH (1 << 7) | |
295 | #define UVC_STREAM_ERR (1 << 6) | |
296 | #define UVC_STREAM_STI (1 << 5) | |
297 | #define UVC_STREAM_RES (1 << 4) | |
298 | #define UVC_STREAM_SCR (1 << 3) | |
299 | #define UVC_STREAM_PTS (1 << 2) | |
300 | #define UVC_STREAM_EOF (1 << 1) | |
301 | #define UVC_STREAM_FID (1 << 0) | |
302 | ||
303 | /* Video payload decoding is handled by uvc_video_decode_start(), | |
304 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
305 | * | |
306 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
307 | * isochronous payload. It processes header data and returns the header size | |
308 | * in bytes if successful. If an error occurs, it returns a negative error | |
309 | * code. The following error codes have special meanings. | |
310 | * | |
311 | * - EAGAIN informs the caller that the current video buffer should be marked | |
312 | * as done, and that the function should be called again with the same data | |
313 | * and a new video buffer. This is used when end of frame conditions can be | |
314 | * reliably detected at the beginning of the next frame only. | |
315 | * | |
316 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
317 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
318 | * made until the next payload. -ENODATA can be used to drop the current | |
319 | * payload if no other error code is appropriate. | |
320 | * | |
321 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
322 | * data to the video buffer. | |
323 | * | |
324 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
325 | * isochronous payload. It performs any additional header data processing and | |
326 | * returns 0 or a negative error code if an error occured. As header data have | |
327 | * already been processed by uvc_video_decode_start, this functions isn't | |
328 | * required to perform sanity checks a second time. | |
329 | * | |
330 | * For isochronous transfers where a payload is always transfered in a single | |
331 | * URB, the three functions will be called in a row. | |
332 | * | |
333 | * To let the decoder process header data and update its internal state even | |
334 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
335 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
336 | * uvc_video_decode_end will never be called with a NULL buffer. | |
337 | */ | |
338 | static int uvc_video_decode_start(struct uvc_video_device *video, | |
339 | struct uvc_buffer *buf, const __u8 *data, int len) | |
340 | { | |
341 | __u8 fid; | |
342 | ||
343 | /* Sanity checks: | |
344 | * - packet must be at least 2 bytes long | |
345 | * - bHeaderLength value must be at least 2 bytes (see above) | |
346 | * - bHeaderLength value can't be larger than the packet size. | |
347 | */ | |
348 | if (len < 2 || data[0] < 2 || data[0] > len) | |
349 | return -EINVAL; | |
350 | ||
351 | /* Skip payloads marked with the error bit ("error frames"). */ | |
352 | if (data[1] & UVC_STREAM_ERR) { | |
353 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | |
354 | "set).\n"); | |
355 | return -ENODATA; | |
356 | } | |
357 | ||
358 | fid = data[1] & UVC_STREAM_FID; | |
359 | ||
360 | /* Store the payload FID bit and return immediately when the buffer is | |
361 | * NULL. | |
362 | */ | |
363 | if (buf == NULL) { | |
364 | video->last_fid = fid; | |
365 | return -ENODATA; | |
366 | } | |
367 | ||
368 | /* Synchronize to the input stream by waiting for the FID bit to be | |
369 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
f8dd4af6 | 370 | * video->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
371 | * frame will always be in sync. |
372 | * | |
373 | * If the device doesn't toggle the FID bit, invert video->last_fid | |
374 | * when the EOF bit is set to force synchronisation on the next packet. | |
375 | */ | |
376 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
377 | if (fid == video->last_fid) { | |
378 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " | |
379 | "sync).\n"); | |
380 | if ((video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && | |
381 | (data[1] & UVC_STREAM_EOF)) | |
382 | video->last_fid ^= UVC_STREAM_FID; | |
383 | return -ENODATA; | |
384 | } | |
385 | ||
386 | /* TODO: Handle PTS and SCR. */ | |
387 | buf->state = UVC_BUF_STATE_ACTIVE; | |
388 | } | |
389 | ||
390 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
391 | * End of frame detection is better implemented by checking the EOF | |
392 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
393 | * bit), but some devices don't set the bit at end of frame (and the | |
394 | * last payload can be lost anyway). We thus must check if the FID has | |
395 | * been toggled. | |
396 | * | |
f8dd4af6 | 397 | * video->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
398 | * frame will never trigger an end of frame detection. |
399 | * | |
400 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
401 | * as it doesn't make sense to return an empty buffer. This also | |
402 | * avoids detecting and of frame conditions at FID toggling if the | |
403 | * previous payload had the EOF bit set. | |
404 | */ | |
405 | if (fid != video->last_fid && buf->buf.bytesused != 0) { | |
406 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " | |
407 | "toggled).\n"); | |
408 | buf->state = UVC_BUF_STATE_DONE; | |
409 | return -EAGAIN; | |
410 | } | |
411 | ||
412 | video->last_fid = fid; | |
413 | ||
414 | return data[0]; | |
415 | } | |
416 | ||
417 | static void uvc_video_decode_data(struct uvc_video_device *video, | |
418 | struct uvc_buffer *buf, const __u8 *data, int len) | |
419 | { | |
420 | struct uvc_video_queue *queue = &video->queue; | |
421 | unsigned int maxlen, nbytes; | |
422 | void *mem; | |
423 | ||
424 | if (len <= 0) | |
425 | return; | |
426 | ||
427 | /* Copy the video data to the buffer. */ | |
428 | maxlen = buf->buf.length - buf->buf.bytesused; | |
429 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; | |
430 | nbytes = min((unsigned int)len, maxlen); | |
431 | memcpy(mem, data, nbytes); | |
432 | buf->buf.bytesused += nbytes; | |
433 | ||
434 | /* Complete the current frame if the buffer size was exceeded. */ | |
435 | if (len > maxlen) { | |
436 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
437 | buf->state = UVC_BUF_STATE_DONE; | |
438 | } | |
439 | } | |
440 | ||
441 | static void uvc_video_decode_end(struct uvc_video_device *video, | |
442 | struct uvc_buffer *buf, const __u8 *data, int len) | |
443 | { | |
444 | /* Mark the buffer as done if the EOF marker is set. */ | |
445 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { | |
446 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); | |
447 | if (data[0] == len) | |
448 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
449 | buf->state = UVC_BUF_STATE_DONE; | |
450 | if (video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) | |
451 | video->last_fid ^= UVC_STREAM_FID; | |
452 | } | |
453 | } | |
454 | ||
ff924203 LP |
455 | static int uvc_video_encode_header(struct uvc_video_device *video, |
456 | struct uvc_buffer *buf, __u8 *data, int len) | |
457 | { | |
458 | data[0] = 2; /* Header length */ | |
459 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | |
460 | | (video->last_fid & UVC_STREAM_FID); | |
461 | return 2; | |
462 | } | |
463 | ||
464 | static int uvc_video_encode_data(struct uvc_video_device *video, | |
465 | struct uvc_buffer *buf, __u8 *data, int len) | |
466 | { | |
467 | struct uvc_video_queue *queue = &video->queue; | |
468 | unsigned int nbytes; | |
469 | void *mem; | |
470 | ||
471 | /* Copy video data to the URB buffer. */ | |
472 | mem = queue->mem + buf->buf.m.offset + queue->buf_used; | |
473 | nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used); | |
474 | nbytes = min(video->bulk.max_payload_size - video->bulk.payload_size, | |
475 | nbytes); | |
476 | memcpy(data, mem, nbytes); | |
477 | ||
478 | queue->buf_used += nbytes; | |
479 | ||
480 | return nbytes; | |
481 | } | |
482 | ||
c0efd232 LP |
483 | /* ------------------------------------------------------------------------ |
484 | * URB handling | |
485 | */ | |
486 | ||
487 | /* | |
488 | * Completion handler for video URBs. | |
489 | */ | |
490 | static void uvc_video_decode_isoc(struct urb *urb, | |
491 | struct uvc_video_device *video, struct uvc_buffer *buf) | |
492 | { | |
493 | u8 *mem; | |
494 | int ret, i; | |
495 | ||
496 | for (i = 0; i < urb->number_of_packets; ++i) { | |
497 | if (urb->iso_frame_desc[i].status < 0) { | |
498 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
499 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
500 | continue; | |
501 | } | |
502 | ||
503 | /* Decode the payload header. */ | |
504 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
505 | do { | |
506 | ret = uvc_video_decode_start(video, buf, mem, | |
507 | urb->iso_frame_desc[i].actual_length); | |
508 | if (ret == -EAGAIN) | |
509 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
510 | } while (ret == -EAGAIN); | |
511 | ||
512 | if (ret < 0) | |
513 | continue; | |
514 | ||
515 | /* Decode the payload data. */ | |
516 | uvc_video_decode_data(video, buf, mem + ret, | |
517 | urb->iso_frame_desc[i].actual_length - ret); | |
518 | ||
519 | /* Process the header again. */ | |
08ebd003 LP |
520 | uvc_video_decode_end(video, buf, mem, |
521 | urb->iso_frame_desc[i].actual_length); | |
c0efd232 LP |
522 | |
523 | if (buf->state == UVC_BUF_STATE_DONE || | |
524 | buf->state == UVC_BUF_STATE_ERROR) | |
525 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
526 | } | |
527 | } | |
528 | ||
529 | static void uvc_video_decode_bulk(struct urb *urb, | |
530 | struct uvc_video_device *video, struct uvc_buffer *buf) | |
531 | { | |
532 | u8 *mem; | |
533 | int len, ret; | |
534 | ||
535 | mem = urb->transfer_buffer; | |
536 | len = urb->actual_length; | |
537 | video->bulk.payload_size += len; | |
538 | ||
539 | /* If the URB is the first of its payload, decode and save the | |
540 | * header. | |
541 | */ | |
f8dd4af6 | 542 | if (video->bulk.header_size == 0 && !video->bulk.skip_payload) { |
c0efd232 LP |
543 | do { |
544 | ret = uvc_video_decode_start(video, buf, mem, len); | |
545 | if (ret == -EAGAIN) | |
546 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
547 | } while (ret == -EAGAIN); | |
548 | ||
549 | /* If an error occured skip the rest of the payload. */ | |
550 | if (ret < 0 || buf == NULL) { | |
551 | video->bulk.skip_payload = 1; | |
f8dd4af6 LP |
552 | } else { |
553 | memcpy(video->bulk.header, mem, ret); | |
554 | video->bulk.header_size = ret; | |
c0efd232 | 555 | |
f8dd4af6 LP |
556 | mem += ret; |
557 | len -= ret; | |
558 | } | |
c0efd232 LP |
559 | } |
560 | ||
561 | /* The buffer queue might have been cancelled while a bulk transfer | |
562 | * was in progress, so we can reach here with buf equal to NULL. Make | |
563 | * sure buf is never dereferenced if NULL. | |
564 | */ | |
565 | ||
566 | /* Process video data. */ | |
567 | if (!video->bulk.skip_payload && buf != NULL) | |
568 | uvc_video_decode_data(video, buf, mem, len); | |
569 | ||
570 | /* Detect the payload end by a URB smaller than the maximum size (or | |
571 | * a payload size equal to the maximum) and process the header again. | |
572 | */ | |
573 | if (urb->actual_length < urb->transfer_buffer_length || | |
574 | video->bulk.payload_size >= video->bulk.max_payload_size) { | |
575 | if (!video->bulk.skip_payload && buf != NULL) { | |
576 | uvc_video_decode_end(video, buf, video->bulk.header, | |
08ebd003 | 577 | video->bulk.payload_size); |
c0efd232 LP |
578 | if (buf->state == UVC_BUF_STATE_DONE || |
579 | buf->state == UVC_BUF_STATE_ERROR) | |
580 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
581 | } | |
582 | ||
583 | video->bulk.header_size = 0; | |
584 | video->bulk.skip_payload = 0; | |
585 | video->bulk.payload_size = 0; | |
586 | } | |
587 | } | |
588 | ||
ff924203 LP |
589 | static void uvc_video_encode_bulk(struct urb *urb, |
590 | struct uvc_video_device *video, struct uvc_buffer *buf) | |
591 | { | |
592 | u8 *mem = urb->transfer_buffer; | |
593 | int len = video->urb_size, ret; | |
594 | ||
595 | if (buf == NULL) { | |
596 | urb->transfer_buffer_length = 0; | |
597 | return; | |
598 | } | |
599 | ||
600 | /* If the URB is the first of its payload, add the header. */ | |
601 | if (video->bulk.header_size == 0) { | |
602 | ret = uvc_video_encode_header(video, buf, mem, len); | |
603 | video->bulk.header_size = ret; | |
604 | video->bulk.payload_size += ret; | |
605 | mem += ret; | |
606 | len -= ret; | |
607 | } | |
608 | ||
609 | /* Process video data. */ | |
610 | ret = uvc_video_encode_data(video, buf, mem, len); | |
611 | ||
612 | video->bulk.payload_size += ret; | |
613 | len -= ret; | |
614 | ||
615 | if (buf->buf.bytesused == video->queue.buf_used || | |
616 | video->bulk.payload_size == video->bulk.max_payload_size) { | |
617 | if (buf->buf.bytesused == video->queue.buf_used) { | |
618 | video->queue.buf_used = 0; | |
619 | buf->state = UVC_BUF_STATE_DONE; | |
620 | uvc_queue_next_buffer(&video->queue, buf); | |
621 | video->last_fid ^= UVC_STREAM_FID; | |
622 | } | |
623 | ||
624 | video->bulk.header_size = 0; | |
625 | video->bulk.payload_size = 0; | |
626 | } | |
627 | ||
628 | urb->transfer_buffer_length = video->urb_size - len; | |
629 | } | |
630 | ||
c0efd232 LP |
631 | static void uvc_video_complete(struct urb *urb) |
632 | { | |
633 | struct uvc_video_device *video = urb->context; | |
634 | struct uvc_video_queue *queue = &video->queue; | |
635 | struct uvc_buffer *buf = NULL; | |
636 | unsigned long flags; | |
637 | int ret; | |
638 | ||
639 | switch (urb->status) { | |
640 | case 0: | |
641 | break; | |
642 | ||
643 | default: | |
644 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
645 | "completion handler.\n", urb->status); | |
646 | ||
647 | case -ENOENT: /* usb_kill_urb() called. */ | |
648 | if (video->frozen) | |
649 | return; | |
650 | ||
651 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
652 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
653 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
654 | return; | |
655 | } | |
656 | ||
657 | spin_lock_irqsave(&queue->irqlock, flags); | |
658 | if (!list_empty(&queue->irqqueue)) | |
659 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
660 | queue); | |
661 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
662 | ||
663 | video->decode(urb, video, buf); | |
664 | ||
665 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
666 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
667 | ret); | |
668 | } | |
669 | } | |
670 | ||
e01117c8 LP |
671 | /* |
672 | * Free transfer buffers. | |
673 | */ | |
674 | static void uvc_free_urb_buffers(struct uvc_video_device *video) | |
675 | { | |
676 | unsigned int i; | |
677 | ||
678 | for (i = 0; i < UVC_URBS; ++i) { | |
679 | if (video->urb_buffer[i]) { | |
680 | usb_buffer_free(video->dev->udev, video->urb_size, | |
681 | video->urb_buffer[i], video->urb_dma[i]); | |
682 | video->urb_buffer[i] = NULL; | |
683 | } | |
684 | } | |
685 | ||
686 | video->urb_size = 0; | |
687 | } | |
688 | ||
689 | /* | |
690 | * Allocate transfer buffers. This function can be called with buffers | |
691 | * already allocated when resuming from suspend, in which case it will | |
692 | * return without touching the buffers. | |
693 | * | |
694 | * Return 0 on success or -ENOMEM when out of memory. | |
695 | */ | |
696 | static int uvc_alloc_urb_buffers(struct uvc_video_device *video, | |
697 | unsigned int size) | |
698 | { | |
699 | unsigned int i; | |
700 | ||
701 | /* Buffers are already allocated, bail out. */ | |
702 | if (video->urb_size) | |
703 | return 0; | |
704 | ||
705 | for (i = 0; i < UVC_URBS; ++i) { | |
706 | video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev, | |
707 | size, GFP_KERNEL, &video->urb_dma[i]); | |
708 | if (video->urb_buffer[i] == NULL) { | |
709 | uvc_free_urb_buffers(video); | |
710 | return -ENOMEM; | |
711 | } | |
712 | } | |
713 | ||
714 | video->urb_size = size; | |
715 | return 0; | |
716 | } | |
717 | ||
c0efd232 LP |
718 | /* |
719 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
720 | */ | |
e01117c8 | 721 | static void uvc_uninit_video(struct uvc_video_device *video, int free_buffers) |
c0efd232 LP |
722 | { |
723 | struct urb *urb; | |
724 | unsigned int i; | |
725 | ||
726 | for (i = 0; i < UVC_URBS; ++i) { | |
727 | if ((urb = video->urb[i]) == NULL) | |
728 | continue; | |
729 | ||
730 | usb_kill_urb(urb); | |
c0efd232 LP |
731 | usb_free_urb(urb); |
732 | video->urb[i] = NULL; | |
733 | } | |
e01117c8 LP |
734 | |
735 | if (free_buffers) | |
736 | uvc_free_urb_buffers(video); | |
c0efd232 LP |
737 | } |
738 | ||
739 | /* | |
740 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
741 | * is given by the endpoint. | |
742 | */ | |
743 | static int uvc_init_video_isoc(struct uvc_video_device *video, | |
29135878 | 744 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
745 | { |
746 | struct urb *urb; | |
747 | unsigned int npackets, i, j; | |
748 | __u16 psize; | |
749 | __u32 size; | |
750 | ||
751 | /* Compute the number of isochronous packets to allocate by dividing | |
752 | * the maximum video frame size by the packet size. Limit the result | |
753 | * to UVC_MAX_ISO_PACKETS. | |
754 | */ | |
755 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
756 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
757 | ||
758 | size = video->streaming->ctrl.dwMaxVideoFrameSize; | |
759 | if (size > UVC_MAX_FRAME_SIZE) | |
760 | return -EINVAL; | |
761 | ||
e9e24cee | 762 | npackets = DIV_ROUND_UP(size, psize); |
c0efd232 LP |
763 | if (npackets > UVC_MAX_ISO_PACKETS) |
764 | npackets = UVC_MAX_ISO_PACKETS; | |
765 | ||
766 | size = npackets * psize; | |
767 | ||
e01117c8 LP |
768 | if (uvc_alloc_urb_buffers(video, size) < 0) |
769 | return -ENOMEM; | |
770 | ||
c0efd232 | 771 | for (i = 0; i < UVC_URBS; ++i) { |
29135878 | 772 | urb = usb_alloc_urb(npackets, gfp_flags); |
c0efd232 | 773 | if (urb == NULL) { |
e01117c8 | 774 | uvc_uninit_video(video, 1); |
c0efd232 LP |
775 | return -ENOMEM; |
776 | } | |
777 | ||
778 | urb->dev = video->dev->udev; | |
779 | urb->context = video; | |
780 | urb->pipe = usb_rcvisocpipe(video->dev->udev, | |
781 | ep->desc.bEndpointAddress); | |
782 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
783 | urb->interval = ep->desc.bInterval; | |
784 | urb->transfer_buffer = video->urb_buffer[i]; | |
e01117c8 | 785 | urb->transfer_dma = video->urb_dma[i]; |
c0efd232 LP |
786 | urb->complete = uvc_video_complete; |
787 | urb->number_of_packets = npackets; | |
788 | urb->transfer_buffer_length = size; | |
789 | ||
790 | for (j = 0; j < npackets; ++j) { | |
791 | urb->iso_frame_desc[j].offset = j * psize; | |
792 | urb->iso_frame_desc[j].length = psize; | |
793 | } | |
794 | ||
795 | video->urb[i] = urb; | |
796 | } | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | /* | |
802 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
803 | * given by the endpoint. | |
804 | */ | |
805 | static int uvc_init_video_bulk(struct uvc_video_device *video, | |
29135878 | 806 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
807 | { |
808 | struct urb *urb; | |
809 | unsigned int pipe, i; | |
810 | __u16 psize; | |
811 | __u32 size; | |
812 | ||
813 | /* Compute the bulk URB size. Some devices set the maximum payload | |
814 | * size to a value too high for memory-constrained devices. We must | |
815 | * then transfer the payload accross multiple URBs. To be consistant | |
816 | * with isochronous mode, allocate maximum UVC_MAX_ISO_PACKETS per bulk | |
817 | * URB. | |
818 | */ | |
819 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; | |
820 | size = video->streaming->ctrl.dwMaxPayloadTransferSize; | |
821 | video->bulk.max_payload_size = size; | |
822 | if (size > psize * UVC_MAX_ISO_PACKETS) | |
823 | size = psize * UVC_MAX_ISO_PACKETS; | |
824 | ||
e01117c8 LP |
825 | if (uvc_alloc_urb_buffers(video, size) < 0) |
826 | return -ENOMEM; | |
827 | ||
ff924203 LP |
828 | if (usb_endpoint_dir_in(&ep->desc)) |
829 | pipe = usb_rcvbulkpipe(video->dev->udev, | |
830 | ep->desc.bEndpointAddress); | |
831 | else | |
832 | pipe = usb_sndbulkpipe(video->dev->udev, | |
833 | ep->desc.bEndpointAddress); | |
834 | ||
835 | if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) | |
836 | size = 0; | |
c0efd232 LP |
837 | |
838 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 839 | urb = usb_alloc_urb(0, gfp_flags); |
c0efd232 | 840 | if (urb == NULL) { |
e01117c8 | 841 | uvc_uninit_video(video, 1); |
c0efd232 LP |
842 | return -ENOMEM; |
843 | } | |
844 | ||
845 | usb_fill_bulk_urb(urb, video->dev->udev, pipe, | |
846 | video->urb_buffer[i], size, uvc_video_complete, | |
847 | video); | |
848 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; | |
e01117c8 | 849 | urb->transfer_dma = video->urb_dma[i]; |
c0efd232 LP |
850 | |
851 | video->urb[i] = urb; | |
852 | } | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
859 | */ | |
29135878 | 860 | static int uvc_init_video(struct uvc_video_device *video, gfp_t gfp_flags) |
c0efd232 LP |
861 | { |
862 | struct usb_interface *intf = video->streaming->intf; | |
863 | struct usb_host_interface *alts; | |
864 | struct usb_host_endpoint *ep = NULL; | |
865 | int intfnum = video->streaming->intfnum; | |
866 | unsigned int bandwidth, psize, i; | |
867 | int ret; | |
868 | ||
869 | video->last_fid = -1; | |
870 | video->bulk.header_size = 0; | |
871 | video->bulk.skip_payload = 0; | |
872 | video->bulk.payload_size = 0; | |
873 | ||
874 | if (intf->num_altsetting > 1) { | |
875 | /* Isochronous endpoint, select the alternate setting. */ | |
876 | bandwidth = video->streaming->ctrl.dwMaxPayloadTransferSize; | |
877 | ||
878 | if (bandwidth == 0) { | |
879 | uvc_printk(KERN_WARNING, "device %s requested null " | |
880 | "bandwidth, defaulting to lowest.\n", | |
881 | video->vdev->name); | |
882 | bandwidth = 1; | |
883 | } | |
884 | ||
885 | for (i = 0; i < intf->num_altsetting; ++i) { | |
886 | alts = &intf->altsetting[i]; | |
887 | ep = uvc_find_endpoint(alts, | |
888 | video->streaming->header.bEndpointAddress); | |
889 | if (ep == NULL) | |
890 | continue; | |
891 | ||
892 | /* Check if the bandwidth is high enough. */ | |
893 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
894 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
895 | if (psize >= bandwidth) | |
896 | break; | |
897 | } | |
898 | ||
899 | if (i >= intf->num_altsetting) | |
900 | return -EIO; | |
901 | ||
902 | if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0) | |
903 | return ret; | |
904 | ||
29135878 | 905 | ret = uvc_init_video_isoc(video, ep, gfp_flags); |
c0efd232 LP |
906 | } else { |
907 | /* Bulk endpoint, proceed to URB initialization. */ | |
908 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
909 | video->streaming->header.bEndpointAddress); | |
910 | if (ep == NULL) | |
911 | return -EIO; | |
912 | ||
29135878 | 913 | ret = uvc_init_video_bulk(video, ep, gfp_flags); |
c0efd232 LP |
914 | } |
915 | ||
916 | if (ret < 0) | |
917 | return ret; | |
918 | ||
919 | /* Submit the URBs. */ | |
920 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 921 | if ((ret = usb_submit_urb(video->urb[i], gfp_flags)) < 0) { |
c0efd232 LP |
922 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
923 | "(%d).\n", i, ret); | |
e01117c8 | 924 | uvc_uninit_video(video, 1); |
c0efd232 LP |
925 | return ret; |
926 | } | |
927 | } | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
932 | /* -------------------------------------------------------------------------- | |
933 | * Suspend/resume | |
934 | */ | |
935 | ||
936 | /* | |
937 | * Stop streaming without disabling the video queue. | |
938 | * | |
939 | * To let userspace applications resume without trouble, we must not touch the | |
940 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
941 | * completion handler won't try to cancel the queue when we kill the URBs. | |
942 | */ | |
943 | int uvc_video_suspend(struct uvc_video_device *video) | |
944 | { | |
945 | if (!uvc_queue_streaming(&video->queue)) | |
946 | return 0; | |
947 | ||
948 | video->frozen = 1; | |
e01117c8 | 949 | uvc_uninit_video(video, 0); |
c0efd232 LP |
950 | usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); |
951 | return 0; | |
952 | } | |
953 | ||
954 | /* | |
955 | * Reconfigure the video interface and restart streaming if it was enable | |
956 | * before suspend. | |
957 | * | |
958 | * If an error occurs, disable the video queue. This will wake all pending | |
959 | * buffers, making sure userspace applications are notified of the problem | |
960 | * instead of waiting forever. | |
961 | */ | |
962 | int uvc_video_resume(struct uvc_video_device *video) | |
963 | { | |
964 | int ret; | |
965 | ||
966 | video->frozen = 0; | |
967 | ||
23867b25 | 968 | if ((ret = uvc_commit_video(video, &video->streaming->ctrl)) < 0) { |
c0efd232 LP |
969 | uvc_queue_enable(&video->queue, 0); |
970 | return ret; | |
971 | } | |
972 | ||
973 | if (!uvc_queue_streaming(&video->queue)) | |
974 | return 0; | |
975 | ||
29135878 | 976 | if ((ret = uvc_init_video(video, GFP_NOIO)) < 0) |
c0efd232 LP |
977 | uvc_queue_enable(&video->queue, 0); |
978 | ||
979 | return ret; | |
980 | } | |
981 | ||
982 | /* ------------------------------------------------------------------------ | |
983 | * Video device | |
984 | */ | |
985 | ||
986 | /* | |
987 | * Initialize the UVC video device by retrieving the default format and | |
988 | * committing it. | |
989 | * | |
990 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
991 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
992 | * violation, so try to silently fix the values if possible. | |
993 | * | |
994 | * This function is called before registering the device with V4L. | |
995 | */ | |
996 | int uvc_video_init(struct uvc_video_device *video) | |
997 | { | |
998 | struct uvc_streaming_control *probe = &video->streaming->ctrl; | |
999 | struct uvc_format *format = NULL; | |
1000 | struct uvc_frame *frame = NULL; | |
1001 | unsigned int i; | |
1002 | int ret; | |
1003 | ||
1004 | if (video->streaming->nformats == 0) { | |
1005 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); | |
1006 | return -EINVAL; | |
1007 | } | |
1008 | ||
1009 | /* Alternate setting 0 should be the default, yet the XBox Live Vision | |
1010 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
1011 | * they don't receive a SET_INTERFACE request before any other video | |
1012 | * control request. | |
1013 | */ | |
1014 | usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); | |
1015 | ||
1016 | /* Some webcams don't suport GET_DEF request on the probe control. We | |
1017 | * fall back to GET_CUR if GET_DEF fails. | |
1018 | */ | |
1019 | if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_DEF)) < 0 && | |
1020 | (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) | |
1021 | return ret; | |
1022 | ||
1023 | /* Check if the default format descriptor exists. Use the first | |
1024 | * available format otherwise. | |
1025 | */ | |
1026 | for (i = video->streaming->nformats; i > 0; --i) { | |
1027 | format = &video->streaming->format[i-1]; | |
1028 | if (format->index == probe->bFormatIndex) | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | if (format->nframes == 0) { | |
1033 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
1034 | "default format.\n"); | |
1035 | return -EINVAL; | |
1036 | } | |
1037 | ||
1038 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
1039 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
1040 | * descriptor with bFrameIndex set to zero. If the default frame | |
1041 | * descriptor is not found, use the first avalable frame. | |
1042 | */ | |
1043 | for (i = format->nframes; i > 0; --i) { | |
1044 | frame = &format->frame[i-1]; | |
1045 | if (frame->bFrameIndex == probe->bFrameIndex) | |
1046 | break; | |
1047 | } | |
1048 | ||
c0efd232 LP |
1049 | probe->bFormatIndex = format->index; |
1050 | probe->bFrameIndex = frame->bFrameIndex; | |
c0efd232 LP |
1051 | |
1052 | video->streaming->cur_format = format; | |
1053 | video->streaming->cur_frame = frame; | |
1054 | atomic_set(&video->active, 0); | |
1055 | ||
1056 | /* Select the video decoding function */ | |
ff924203 LP |
1057 | if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { |
1058 | if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
1059 | video->decode = uvc_video_decode_isight; | |
1060 | else if (video->streaming->intf->num_altsetting > 1) | |
1061 | video->decode = uvc_video_decode_isoc; | |
1062 | else | |
1063 | video->decode = uvc_video_decode_bulk; | |
1064 | } else { | |
1065 | if (video->streaming->intf->num_altsetting == 1) | |
1066 | video->decode = uvc_video_encode_bulk; | |
1067 | else { | |
1068 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | |
1069 | "supported for video output devices.\n"); | |
1070 | return -EINVAL; | |
1071 | } | |
1072 | } | |
c0efd232 LP |
1073 | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Enable or disable the video stream. | |
1079 | */ | |
1080 | int uvc_video_enable(struct uvc_video_device *video, int enable) | |
1081 | { | |
1082 | int ret; | |
1083 | ||
1084 | if (!enable) { | |
e01117c8 | 1085 | uvc_uninit_video(video, 1); |
c0efd232 LP |
1086 | usb_set_interface(video->dev->udev, |
1087 | video->streaming->intfnum, 0); | |
1088 | uvc_queue_enable(&video->queue, 0); | |
1089 | return 0; | |
1090 | } | |
1091 | ||
0fbd8ee6 LP |
1092 | if ((video->streaming->cur_format->flags & UVC_FMT_FLAG_COMPRESSED) || |
1093 | uvc_no_drop_param) | |
d63beb9e LP |
1094 | video->queue.flags &= ~UVC_QUEUE_DROP_INCOMPLETE; |
1095 | else | |
1096 | video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE; | |
1097 | ||
c0efd232 LP |
1098 | if ((ret = uvc_queue_enable(&video->queue, 1)) < 0) |
1099 | return ret; | |
1100 | ||
23867b25 LP |
1101 | /* Commit the streaming parameters. */ |
1102 | if ((ret = uvc_commit_video(video, &video->streaming->ctrl)) < 0) | |
1103 | return ret; | |
1104 | ||
29135878 | 1105 | return uvc_init_video(video, GFP_KERNEL); |
c0efd232 | 1106 | } |
f87086e3 | 1107 |