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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> | |
15 | #include <linux/version.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/usb.h> | |
19 | #include <linux/videodev2.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/wait.h> | |
22 | #include <asm/atomic.h> | |
23 | #include <asm/unaligned.h> | |
24 | ||
25 | #include <media/v4l2-common.h> | |
26 | ||
27 | #include "uvcvideo.h" | |
28 | ||
29 | /* ------------------------------------------------------------------------ | |
30 | * UVC Controls | |
31 | */ | |
32 | ||
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 | int ret; | |
40 | ||
41 | pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0) | |
42 | : usb_sndctrlpipe(dev->udev, 0); | |
43 | type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT; | |
44 | ||
45 | ret = usb_control_msg(dev->udev, pipe, query, type, cs << 8, | |
46 | unit << 8 | intfnum, data, size, timeout); | |
47 | ||
48 | if (ret != size) { | |
49 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u " | |
50 | "(unit %u) : %d (exp. %u).\n", query, cs, unit, ret, | |
51 | size); | |
52 | return -EIO; | |
53 | } | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, | |
59 | __u8 intfnum, __u8 cs, void *data, __u16 size) | |
60 | { | |
61 | return __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, | |
62 | UVC_CTRL_CONTROL_TIMEOUT); | |
63 | } | |
64 | ||
65 | static void uvc_fixup_buffer_size(struct uvc_video_device *video, | |
66 | struct uvc_streaming_control *ctrl) | |
67 | { | |
68 | struct uvc_format *format; | |
69 | struct uvc_frame *frame; | |
70 | ||
71 | if (ctrl->bFormatIndex <= 0 || | |
72 | ctrl->bFormatIndex > video->streaming->nformats) | |
73 | return; | |
74 | ||
75 | format = &video->streaming->format[ctrl->bFormatIndex - 1]; | |
76 | ||
77 | if (ctrl->bFrameIndex <= 0 || | |
78 | ctrl->bFrameIndex > format->nframes) | |
79 | return; | |
80 | ||
81 | frame = &format->frame[ctrl->bFrameIndex - 1]; | |
82 | ||
83 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || | |
84 | (ctrl->dwMaxVideoFrameSize == 0 && | |
85 | video->dev->uvc_version < 0x0110)) | |
86 | ctrl->dwMaxVideoFrameSize = | |
87 | frame->dwMaxVideoFrameBufferSize; | |
88 | } | |
89 | ||
90 | static int uvc_get_video_ctrl(struct uvc_video_device *video, | |
91 | struct uvc_streaming_control *ctrl, int probe, __u8 query) | |
92 | { | |
93 | __u8 data[34]; | |
94 | __u8 size; | |
95 | int ret; | |
96 | ||
97 | size = video->dev->uvc_version >= 0x0110 ? 34 : 26; | |
98 | ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum, | |
99 | probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, &data, size, | |
100 | UVC_CTRL_STREAMING_TIMEOUT); | |
101 | ||
102 | if (ret < 0) | |
103 | return ret; | |
104 | ||
105 | ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); | |
106 | ctrl->bFormatIndex = data[2]; | |
107 | ctrl->bFrameIndex = data[3]; | |
108 | ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]); | |
109 | ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]); | |
110 | ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]); | |
111 | ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]); | |
112 | ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]); | |
113 | ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]); | |
114 | ctrl->dwMaxVideoFrameSize = | |
115 | le32_to_cpu(get_unaligned((__le32 *)&data[18])); | |
116 | ctrl->dwMaxPayloadTransferSize = | |
117 | le32_to_cpu(get_unaligned((__le32 *)&data[22])); | |
118 | ||
119 | if (size == 34) { | |
120 | ctrl->dwClockFrequency = | |
121 | le32_to_cpu(get_unaligned((__le32 *)&data[26])); | |
122 | ctrl->bmFramingInfo = data[30]; | |
123 | ctrl->bPreferedVersion = data[31]; | |
124 | ctrl->bMinVersion = data[32]; | |
125 | ctrl->bMaxVersion = data[33]; | |
126 | } else { | |
127 | ctrl->dwClockFrequency = video->dev->clock_frequency; | |
128 | ctrl->bmFramingInfo = 0; | |
129 | ctrl->bPreferedVersion = 0; | |
130 | ctrl->bMinVersion = 0; | |
131 | ctrl->bMaxVersion = 0; | |
132 | } | |
133 | ||
134 | /* Some broken devices return a null or wrong dwMaxVideoFrameSize. | |
135 | * Try to get the value from the format and frame descriptor. | |
136 | */ | |
137 | uvc_fixup_buffer_size(video, ctrl); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | int uvc_set_video_ctrl(struct uvc_video_device *video, | |
143 | struct uvc_streaming_control *ctrl, int probe) | |
144 | { | |
145 | __u8 data[34]; | |
146 | __u8 size; | |
147 | ||
148 | size = video->dev->uvc_version >= 0x0110 ? 34 : 26; | |
149 | memset(data, 0, sizeof data); | |
150 | ||
151 | *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint); | |
152 | data[2] = ctrl->bFormatIndex; | |
153 | data[3] = ctrl->bFrameIndex; | |
154 | *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval); | |
155 | *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate); | |
156 | *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate); | |
157 | *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality); | |
158 | *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize); | |
159 | *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay); | |
160 | /* Note: Some of the fields below are not required for IN devices (see | |
161 | * UVC spec, 4.3.1.1), but we still copy them in case support for OUT | |
162 | * devices is added in the future. */ | |
163 | put_unaligned(cpu_to_le32(ctrl->dwMaxVideoFrameSize), | |
164 | (__le32 *)&data[18]); | |
165 | put_unaligned(cpu_to_le32(ctrl->dwMaxPayloadTransferSize), | |
166 | (__le32 *)&data[22]); | |
167 | ||
168 | if (size == 34) { | |
169 | put_unaligned(cpu_to_le32(ctrl->dwClockFrequency), | |
170 | (__le32 *)&data[26]); | |
171 | data[30] = ctrl->bmFramingInfo; | |
172 | data[31] = ctrl->bPreferedVersion; | |
173 | data[32] = ctrl->bMinVersion; | |
174 | data[33] = ctrl->bMaxVersion; | |
175 | } | |
176 | ||
177 | return __uvc_query_ctrl(video->dev, SET_CUR, 0, | |
178 | video->streaming->intfnum, | |
179 | probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, &data, size, | |
180 | UVC_CTRL_STREAMING_TIMEOUT); | |
181 | } | |
182 | ||
183 | int uvc_probe_video(struct uvc_video_device *video, | |
184 | struct uvc_streaming_control *probe) | |
185 | { | |
186 | struct uvc_streaming_control probe_min, probe_max; | |
187 | __u16 bandwidth; | |
188 | unsigned int i; | |
189 | int ret; | |
190 | ||
191 | mutex_lock(&video->streaming->mutex); | |
192 | ||
193 | /* Perform probing. The device should adjust the requested values | |
194 | * according to its capabilities. However, some devices, namely the | |
195 | * first generation UVC Logitech webcams, don't implement the Video | |
196 | * Probe control properly, and just return the needed bandwidth. For | |
197 | * that reason, if the needed bandwidth exceeds the maximum available | |
198 | * bandwidth, try to lower the quality. | |
199 | */ | |
200 | if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0) | |
201 | goto done; | |
202 | ||
203 | /* Get the minimum and maximum values for compression settings. */ | |
204 | if (!(video->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { | |
205 | ret = uvc_get_video_ctrl(video, &probe_min, 1, GET_MIN); | |
206 | if (ret < 0) | |
207 | goto done; | |
208 | ret = uvc_get_video_ctrl(video, &probe_max, 1, GET_MAX); | |
209 | if (ret < 0) | |
210 | goto done; | |
211 | ||
212 | probe->wCompQuality = probe_max.wCompQuality; | |
213 | } | |
214 | ||
215 | for (i = 0; i < 2; ++i) { | |
216 | if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0 || | |
217 | (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) | |
218 | goto done; | |
219 | ||
220 | if (video->streaming->intf->num_altsetting == 1) | |
221 | break; | |
222 | ||
223 | bandwidth = probe->dwMaxPayloadTransferSize; | |
224 | if (bandwidth <= video->streaming->maxpsize) | |
225 | break; | |
226 | ||
227 | if (video->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { | |
228 | ret = -ENOSPC; | |
229 | goto done; | |
230 | } | |
231 | ||
232 | /* TODO: negotiate compression parameters */ | |
233 | probe->wKeyFrameRate = probe_min.wKeyFrameRate; | |
234 | probe->wPFrameRate = probe_min.wPFrameRate; | |
235 | probe->wCompQuality = probe_max.wCompQuality; | |
236 | probe->wCompWindowSize = probe_min.wCompWindowSize; | |
237 | } | |
238 | ||
239 | done: | |
240 | mutex_unlock(&video->streaming->mutex); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | /* ------------------------------------------------------------------------ | |
245 | * Video codecs | |
246 | */ | |
247 | ||
248 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ | |
249 | #define UVC_STREAM_EOH (1 << 7) | |
250 | #define UVC_STREAM_ERR (1 << 6) | |
251 | #define UVC_STREAM_STI (1 << 5) | |
252 | #define UVC_STREAM_RES (1 << 4) | |
253 | #define UVC_STREAM_SCR (1 << 3) | |
254 | #define UVC_STREAM_PTS (1 << 2) | |
255 | #define UVC_STREAM_EOF (1 << 1) | |
256 | #define UVC_STREAM_FID (1 << 0) | |
257 | ||
258 | /* Video payload decoding is handled by uvc_video_decode_start(), | |
259 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
260 | * | |
261 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
262 | * isochronous payload. It processes header data and returns the header size | |
263 | * in bytes if successful. If an error occurs, it returns a negative error | |
264 | * code. The following error codes have special meanings. | |
265 | * | |
266 | * - EAGAIN informs the caller that the current video buffer should be marked | |
267 | * as done, and that the function should be called again with the same data | |
268 | * and a new video buffer. This is used when end of frame conditions can be | |
269 | * reliably detected at the beginning of the next frame only. | |
270 | * | |
271 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
272 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
273 | * made until the next payload. -ENODATA can be used to drop the current | |
274 | * payload if no other error code is appropriate. | |
275 | * | |
276 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
277 | * data to the video buffer. | |
278 | * | |
279 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
280 | * isochronous payload. It performs any additional header data processing and | |
281 | * returns 0 or a negative error code if an error occured. As header data have | |
282 | * already been processed by uvc_video_decode_start, this functions isn't | |
283 | * required to perform sanity checks a second time. | |
284 | * | |
285 | * For isochronous transfers where a payload is always transfered in a single | |
286 | * URB, the three functions will be called in a row. | |
287 | * | |
288 | * To let the decoder process header data and update its internal state even | |
289 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
290 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
291 | * uvc_video_decode_end will never be called with a NULL buffer. | |
292 | */ | |
293 | static int uvc_video_decode_start(struct uvc_video_device *video, | |
294 | struct uvc_buffer *buf, const __u8 *data, int len) | |
295 | { | |
296 | __u8 fid; | |
297 | ||
298 | /* Sanity checks: | |
299 | * - packet must be at least 2 bytes long | |
300 | * - bHeaderLength value must be at least 2 bytes (see above) | |
301 | * - bHeaderLength value can't be larger than the packet size. | |
302 | */ | |
303 | if (len < 2 || data[0] < 2 || data[0] > len) | |
304 | return -EINVAL; | |
305 | ||
306 | /* Skip payloads marked with the error bit ("error frames"). */ | |
307 | if (data[1] & UVC_STREAM_ERR) { | |
308 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | |
309 | "set).\n"); | |
310 | return -ENODATA; | |
311 | } | |
312 | ||
313 | fid = data[1] & UVC_STREAM_FID; | |
314 | ||
315 | /* Store the payload FID bit and return immediately when the buffer is | |
316 | * NULL. | |
317 | */ | |
318 | if (buf == NULL) { | |
319 | video->last_fid = fid; | |
320 | return -ENODATA; | |
321 | } | |
322 | ||
323 | /* Synchronize to the input stream by waiting for the FID bit to be | |
324 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
325 | * queue->last_fid is initialized to -1, so the first isochronous | |
326 | * frame will always be in sync. | |
327 | * | |
328 | * If the device doesn't toggle the FID bit, invert video->last_fid | |
329 | * when the EOF bit is set to force synchronisation on the next packet. | |
330 | */ | |
331 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
332 | if (fid == video->last_fid) { | |
333 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " | |
334 | "sync).\n"); | |
335 | if ((video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && | |
336 | (data[1] & UVC_STREAM_EOF)) | |
337 | video->last_fid ^= UVC_STREAM_FID; | |
338 | return -ENODATA; | |
339 | } | |
340 | ||
341 | /* TODO: Handle PTS and SCR. */ | |
342 | buf->state = UVC_BUF_STATE_ACTIVE; | |
343 | } | |
344 | ||
345 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
346 | * End of frame detection is better implemented by checking the EOF | |
347 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
348 | * bit), but some devices don't set the bit at end of frame (and the | |
349 | * last payload can be lost anyway). We thus must check if the FID has | |
350 | * been toggled. | |
351 | * | |
352 | * queue->last_fid is initialized to -1, so the first isochronous | |
353 | * frame will never trigger an end of frame detection. | |
354 | * | |
355 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
356 | * as it doesn't make sense to return an empty buffer. This also | |
357 | * avoids detecting and of frame conditions at FID toggling if the | |
358 | * previous payload had the EOF bit set. | |
359 | */ | |
360 | if (fid != video->last_fid && buf->buf.bytesused != 0) { | |
361 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " | |
362 | "toggled).\n"); | |
363 | buf->state = UVC_BUF_STATE_DONE; | |
364 | return -EAGAIN; | |
365 | } | |
366 | ||
367 | video->last_fid = fid; | |
368 | ||
369 | return data[0]; | |
370 | } | |
371 | ||
372 | static void uvc_video_decode_data(struct uvc_video_device *video, | |
373 | struct uvc_buffer *buf, const __u8 *data, int len) | |
374 | { | |
375 | struct uvc_video_queue *queue = &video->queue; | |
376 | unsigned int maxlen, nbytes; | |
377 | void *mem; | |
378 | ||
379 | if (len <= 0) | |
380 | return; | |
381 | ||
382 | /* Copy the video data to the buffer. */ | |
383 | maxlen = buf->buf.length - buf->buf.bytesused; | |
384 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; | |
385 | nbytes = min((unsigned int)len, maxlen); | |
386 | memcpy(mem, data, nbytes); | |
387 | buf->buf.bytesused += nbytes; | |
388 | ||
389 | /* Complete the current frame if the buffer size was exceeded. */ | |
390 | if (len > maxlen) { | |
391 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
392 | buf->state = UVC_BUF_STATE_DONE; | |
393 | } | |
394 | } | |
395 | ||
396 | static void uvc_video_decode_end(struct uvc_video_device *video, | |
397 | struct uvc_buffer *buf, const __u8 *data, int len) | |
398 | { | |
399 | /* Mark the buffer as done if the EOF marker is set. */ | |
400 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { | |
401 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); | |
402 | if (data[0] == len) | |
403 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
404 | buf->state = UVC_BUF_STATE_DONE; | |
405 | if (video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) | |
406 | video->last_fid ^= UVC_STREAM_FID; | |
407 | } | |
408 | } | |
409 | ||
410 | /* ------------------------------------------------------------------------ | |
411 | * URB handling | |
412 | */ | |
413 | ||
414 | /* | |
415 | * Completion handler for video URBs. | |
416 | */ | |
417 | static void uvc_video_decode_isoc(struct urb *urb, | |
418 | struct uvc_video_device *video, struct uvc_buffer *buf) | |
419 | { | |
420 | u8 *mem; | |
421 | int ret, i; | |
422 | ||
423 | for (i = 0; i < urb->number_of_packets; ++i) { | |
424 | if (urb->iso_frame_desc[i].status < 0) { | |
425 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
426 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
427 | continue; | |
428 | } | |
429 | ||
430 | /* Decode the payload header. */ | |
431 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
432 | do { | |
433 | ret = uvc_video_decode_start(video, buf, mem, | |
434 | urb->iso_frame_desc[i].actual_length); | |
435 | if (ret == -EAGAIN) | |
436 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
437 | } while (ret == -EAGAIN); | |
438 | ||
439 | if (ret < 0) | |
440 | continue; | |
441 | ||
442 | /* Decode the payload data. */ | |
443 | uvc_video_decode_data(video, buf, mem + ret, | |
444 | urb->iso_frame_desc[i].actual_length - ret); | |
445 | ||
446 | /* Process the header again. */ | |
447 | uvc_video_decode_end(video, buf, mem, ret); | |
448 | ||
449 | if (buf->state == UVC_BUF_STATE_DONE || | |
450 | buf->state == UVC_BUF_STATE_ERROR) | |
451 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
452 | } | |
453 | } | |
454 | ||
455 | static void uvc_video_decode_bulk(struct urb *urb, | |
456 | struct uvc_video_device *video, struct uvc_buffer *buf) | |
457 | { | |
458 | u8 *mem; | |
459 | int len, ret; | |
460 | ||
461 | mem = urb->transfer_buffer; | |
462 | len = urb->actual_length; | |
463 | video->bulk.payload_size += len; | |
464 | ||
465 | /* If the URB is the first of its payload, decode and save the | |
466 | * header. | |
467 | */ | |
468 | if (video->bulk.header_size == 0) { | |
469 | do { | |
470 | ret = uvc_video_decode_start(video, buf, mem, len); | |
471 | if (ret == -EAGAIN) | |
472 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
473 | } while (ret == -EAGAIN); | |
474 | ||
475 | /* If an error occured skip the rest of the payload. */ | |
476 | if (ret < 0 || buf == NULL) { | |
477 | video->bulk.skip_payload = 1; | |
478 | return; | |
479 | } | |
480 | ||
481 | video->bulk.header_size = ret; | |
482 | memcpy(video->bulk.header, mem, video->bulk.header_size); | |
483 | ||
484 | mem += ret; | |
485 | len -= ret; | |
486 | } | |
487 | ||
488 | /* The buffer queue might have been cancelled while a bulk transfer | |
489 | * was in progress, so we can reach here with buf equal to NULL. Make | |
490 | * sure buf is never dereferenced if NULL. | |
491 | */ | |
492 | ||
493 | /* Process video data. */ | |
494 | if (!video->bulk.skip_payload && buf != NULL) | |
495 | uvc_video_decode_data(video, buf, mem, len); | |
496 | ||
497 | /* Detect the payload end by a URB smaller than the maximum size (or | |
498 | * a payload size equal to the maximum) and process the header again. | |
499 | */ | |
500 | if (urb->actual_length < urb->transfer_buffer_length || | |
501 | video->bulk.payload_size >= video->bulk.max_payload_size) { | |
502 | if (!video->bulk.skip_payload && buf != NULL) { | |
503 | uvc_video_decode_end(video, buf, video->bulk.header, | |
504 | video->bulk.header_size); | |
505 | if (buf->state == UVC_BUF_STATE_DONE || | |
506 | buf->state == UVC_BUF_STATE_ERROR) | |
507 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
508 | } | |
509 | ||
510 | video->bulk.header_size = 0; | |
511 | video->bulk.skip_payload = 0; | |
512 | video->bulk.payload_size = 0; | |
513 | } | |
514 | } | |
515 | ||
516 | static void uvc_video_complete(struct urb *urb) | |
517 | { | |
518 | struct uvc_video_device *video = urb->context; | |
519 | struct uvc_video_queue *queue = &video->queue; | |
520 | struct uvc_buffer *buf = NULL; | |
521 | unsigned long flags; | |
522 | int ret; | |
523 | ||
524 | switch (urb->status) { | |
525 | case 0: | |
526 | break; | |
527 | ||
528 | default: | |
529 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
530 | "completion handler.\n", urb->status); | |
531 | ||
532 | case -ENOENT: /* usb_kill_urb() called. */ | |
533 | if (video->frozen) | |
534 | return; | |
535 | ||
536 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
537 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
538 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
539 | return; | |
540 | } | |
541 | ||
542 | spin_lock_irqsave(&queue->irqlock, flags); | |
543 | if (!list_empty(&queue->irqqueue)) | |
544 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
545 | queue); | |
546 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
547 | ||
548 | video->decode(urb, video, buf); | |
549 | ||
550 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
551 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
552 | ret); | |
553 | } | |
554 | } | |
555 | ||
556 | /* | |
557 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
558 | */ | |
559 | static void uvc_uninit_video(struct uvc_video_device *video) | |
560 | { | |
561 | struct urb *urb; | |
562 | unsigned int i; | |
563 | ||
564 | for (i = 0; i < UVC_URBS; ++i) { | |
565 | if ((urb = video->urb[i]) == NULL) | |
566 | continue; | |
567 | ||
568 | usb_kill_urb(urb); | |
569 | /* urb->transfer_buffer_length is not touched by USB core, so | |
570 | * we can use it here as the buffer length. | |
571 | */ | |
572 | if (video->urb_buffer[i]) { | |
573 | usb_buffer_free(video->dev->udev, | |
574 | urb->transfer_buffer_length, | |
575 | video->urb_buffer[i], urb->transfer_dma); | |
576 | video->urb_buffer[i] = NULL; | |
577 | } | |
578 | ||
579 | usb_free_urb(urb); | |
580 | video->urb[i] = NULL; | |
581 | } | |
582 | } | |
583 | ||
584 | /* | |
585 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
586 | * is given by the endpoint. | |
587 | */ | |
588 | static int uvc_init_video_isoc(struct uvc_video_device *video, | |
589 | struct usb_host_endpoint *ep) | |
590 | { | |
591 | struct urb *urb; | |
592 | unsigned int npackets, i, j; | |
593 | __u16 psize; | |
594 | __u32 size; | |
595 | ||
596 | /* Compute the number of isochronous packets to allocate by dividing | |
597 | * the maximum video frame size by the packet size. Limit the result | |
598 | * to UVC_MAX_ISO_PACKETS. | |
599 | */ | |
600 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
601 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
602 | ||
603 | size = video->streaming->ctrl.dwMaxVideoFrameSize; | |
604 | if (size > UVC_MAX_FRAME_SIZE) | |
605 | return -EINVAL; | |
606 | ||
607 | npackets = (size + psize - 1) / psize; | |
608 | if (npackets > UVC_MAX_ISO_PACKETS) | |
609 | npackets = UVC_MAX_ISO_PACKETS; | |
610 | ||
611 | size = npackets * psize; | |
612 | ||
613 | for (i = 0; i < UVC_URBS; ++i) { | |
614 | urb = usb_alloc_urb(npackets, GFP_KERNEL); | |
615 | if (urb == NULL) { | |
616 | uvc_uninit_video(video); | |
617 | return -ENOMEM; | |
618 | } | |
619 | ||
620 | video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev, | |
621 | size, GFP_KERNEL, &urb->transfer_dma); | |
622 | if (video->urb_buffer[i] == NULL) { | |
623 | usb_free_urb(urb); | |
624 | uvc_uninit_video(video); | |
625 | return -ENOMEM; | |
626 | } | |
627 | ||
628 | urb->dev = video->dev->udev; | |
629 | urb->context = video; | |
630 | urb->pipe = usb_rcvisocpipe(video->dev->udev, | |
631 | ep->desc.bEndpointAddress); | |
632 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
633 | urb->interval = ep->desc.bInterval; | |
634 | urb->transfer_buffer = video->urb_buffer[i]; | |
635 | urb->complete = uvc_video_complete; | |
636 | urb->number_of_packets = npackets; | |
637 | urb->transfer_buffer_length = size; | |
638 | ||
639 | for (j = 0; j < npackets; ++j) { | |
640 | urb->iso_frame_desc[j].offset = j * psize; | |
641 | urb->iso_frame_desc[j].length = psize; | |
642 | } | |
643 | ||
644 | video->urb[i] = urb; | |
645 | } | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | /* | |
651 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
652 | * given by the endpoint. | |
653 | */ | |
654 | static int uvc_init_video_bulk(struct uvc_video_device *video, | |
655 | struct usb_host_endpoint *ep) | |
656 | { | |
657 | struct urb *urb; | |
658 | unsigned int pipe, i; | |
659 | __u16 psize; | |
660 | __u32 size; | |
661 | ||
662 | /* Compute the bulk URB size. Some devices set the maximum payload | |
663 | * size to a value too high for memory-constrained devices. We must | |
664 | * then transfer the payload accross multiple URBs. To be consistant | |
665 | * with isochronous mode, allocate maximum UVC_MAX_ISO_PACKETS per bulk | |
666 | * URB. | |
667 | */ | |
668 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; | |
669 | size = video->streaming->ctrl.dwMaxPayloadTransferSize; | |
670 | video->bulk.max_payload_size = size; | |
671 | if (size > psize * UVC_MAX_ISO_PACKETS) | |
672 | size = psize * UVC_MAX_ISO_PACKETS; | |
673 | ||
674 | pipe = usb_rcvbulkpipe(video->dev->udev, ep->desc.bEndpointAddress); | |
675 | ||
676 | for (i = 0; i < UVC_URBS; ++i) { | |
677 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
678 | if (urb == NULL) { | |
679 | uvc_uninit_video(video); | |
680 | return -ENOMEM; | |
681 | } | |
682 | ||
683 | video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev, | |
684 | size, GFP_KERNEL, &urb->transfer_dma); | |
685 | if (video->urb_buffer[i] == NULL) { | |
686 | usb_free_urb(urb); | |
687 | uvc_uninit_video(video); | |
688 | return -ENOMEM; | |
689 | } | |
690 | ||
691 | usb_fill_bulk_urb(urb, video->dev->udev, pipe, | |
692 | video->urb_buffer[i], size, uvc_video_complete, | |
693 | video); | |
694 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; | |
695 | ||
696 | video->urb[i] = urb; | |
697 | } | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | /* | |
703 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
704 | */ | |
705 | static int uvc_init_video(struct uvc_video_device *video) | |
706 | { | |
707 | struct usb_interface *intf = video->streaming->intf; | |
708 | struct usb_host_interface *alts; | |
709 | struct usb_host_endpoint *ep = NULL; | |
710 | int intfnum = video->streaming->intfnum; | |
711 | unsigned int bandwidth, psize, i; | |
712 | int ret; | |
713 | ||
714 | video->last_fid = -1; | |
715 | video->bulk.header_size = 0; | |
716 | video->bulk.skip_payload = 0; | |
717 | video->bulk.payload_size = 0; | |
718 | ||
719 | if (intf->num_altsetting > 1) { | |
720 | /* Isochronous endpoint, select the alternate setting. */ | |
721 | bandwidth = video->streaming->ctrl.dwMaxPayloadTransferSize; | |
722 | ||
723 | if (bandwidth == 0) { | |
724 | uvc_printk(KERN_WARNING, "device %s requested null " | |
725 | "bandwidth, defaulting to lowest.\n", | |
726 | video->vdev->name); | |
727 | bandwidth = 1; | |
728 | } | |
729 | ||
730 | for (i = 0; i < intf->num_altsetting; ++i) { | |
731 | alts = &intf->altsetting[i]; | |
732 | ep = uvc_find_endpoint(alts, | |
733 | video->streaming->header.bEndpointAddress); | |
734 | if (ep == NULL) | |
735 | continue; | |
736 | ||
737 | /* Check if the bandwidth is high enough. */ | |
738 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
739 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
740 | if (psize >= bandwidth) | |
741 | break; | |
742 | } | |
743 | ||
744 | if (i >= intf->num_altsetting) | |
745 | return -EIO; | |
746 | ||
747 | if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0) | |
748 | return ret; | |
749 | ||
750 | ret = uvc_init_video_isoc(video, ep); | |
751 | } else { | |
752 | /* Bulk endpoint, proceed to URB initialization. */ | |
753 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
754 | video->streaming->header.bEndpointAddress); | |
755 | if (ep == NULL) | |
756 | return -EIO; | |
757 | ||
758 | ret = uvc_init_video_bulk(video, ep); | |
759 | } | |
760 | ||
761 | if (ret < 0) | |
762 | return ret; | |
763 | ||
764 | /* Submit the URBs. */ | |
765 | for (i = 0; i < UVC_URBS; ++i) { | |
766 | if ((ret = usb_submit_urb(video->urb[i], GFP_KERNEL)) < 0) { | |
767 | uvc_printk(KERN_ERR, "Failed to submit URB %u " | |
768 | "(%d).\n", i, ret); | |
769 | uvc_uninit_video(video); | |
770 | return ret; | |
771 | } | |
772 | } | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | /* -------------------------------------------------------------------------- | |
778 | * Suspend/resume | |
779 | */ | |
780 | ||
781 | /* | |
782 | * Stop streaming without disabling the video queue. | |
783 | * | |
784 | * To let userspace applications resume without trouble, we must not touch the | |
785 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
786 | * completion handler won't try to cancel the queue when we kill the URBs. | |
787 | */ | |
788 | int uvc_video_suspend(struct uvc_video_device *video) | |
789 | { | |
790 | if (!uvc_queue_streaming(&video->queue)) | |
791 | return 0; | |
792 | ||
793 | video->frozen = 1; | |
794 | uvc_uninit_video(video); | |
795 | usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); | |
796 | return 0; | |
797 | } | |
798 | ||
799 | /* | |
800 | * Reconfigure the video interface and restart streaming if it was enable | |
801 | * before suspend. | |
802 | * | |
803 | * If an error occurs, disable the video queue. This will wake all pending | |
804 | * buffers, making sure userspace applications are notified of the problem | |
805 | * instead of waiting forever. | |
806 | */ | |
807 | int uvc_video_resume(struct uvc_video_device *video) | |
808 | { | |
809 | int ret; | |
810 | ||
811 | video->frozen = 0; | |
812 | ||
813 | if ((ret = uvc_set_video_ctrl(video, &video->streaming->ctrl, 0)) < 0) { | |
814 | uvc_queue_enable(&video->queue, 0); | |
815 | return ret; | |
816 | } | |
817 | ||
818 | if (!uvc_queue_streaming(&video->queue)) | |
819 | return 0; | |
820 | ||
821 | if ((ret = uvc_init_video(video)) < 0) | |
822 | uvc_queue_enable(&video->queue, 0); | |
823 | ||
824 | return ret; | |
825 | } | |
826 | ||
827 | /* ------------------------------------------------------------------------ | |
828 | * Video device | |
829 | */ | |
830 | ||
831 | /* | |
832 | * Initialize the UVC video device by retrieving the default format and | |
833 | * committing it. | |
834 | * | |
835 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
836 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
837 | * violation, so try to silently fix the values if possible. | |
838 | * | |
839 | * This function is called before registering the device with V4L. | |
840 | */ | |
841 | int uvc_video_init(struct uvc_video_device *video) | |
842 | { | |
843 | struct uvc_streaming_control *probe = &video->streaming->ctrl; | |
844 | struct uvc_format *format = NULL; | |
845 | struct uvc_frame *frame = NULL; | |
846 | unsigned int i; | |
847 | int ret; | |
848 | ||
849 | if (video->streaming->nformats == 0) { | |
850 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); | |
851 | return -EINVAL; | |
852 | } | |
853 | ||
854 | /* Alternate setting 0 should be the default, yet the XBox Live Vision | |
855 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
856 | * they don't receive a SET_INTERFACE request before any other video | |
857 | * control request. | |
858 | */ | |
859 | usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); | |
860 | ||
861 | /* Some webcams don't suport GET_DEF request on the probe control. We | |
862 | * fall back to GET_CUR if GET_DEF fails. | |
863 | */ | |
864 | if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_DEF)) < 0 && | |
865 | (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) | |
866 | return ret; | |
867 | ||
868 | /* Check if the default format descriptor exists. Use the first | |
869 | * available format otherwise. | |
870 | */ | |
871 | for (i = video->streaming->nformats; i > 0; --i) { | |
872 | format = &video->streaming->format[i-1]; | |
873 | if (format->index == probe->bFormatIndex) | |
874 | break; | |
875 | } | |
876 | ||
877 | if (format->nframes == 0) { | |
878 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
879 | "default format.\n"); | |
880 | return -EINVAL; | |
881 | } | |
882 | ||
883 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
884 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
885 | * descriptor with bFrameIndex set to zero. If the default frame | |
886 | * descriptor is not found, use the first avalable frame. | |
887 | */ | |
888 | for (i = format->nframes; i > 0; --i) { | |
889 | frame = &format->frame[i-1]; | |
890 | if (frame->bFrameIndex == probe->bFrameIndex) | |
891 | break; | |
892 | } | |
893 | ||
894 | /* Commit the default settings. */ | |
895 | probe->bFormatIndex = format->index; | |
896 | probe->bFrameIndex = frame->bFrameIndex; | |
897 | if ((ret = uvc_set_video_ctrl(video, probe, 0)) < 0) | |
898 | return ret; | |
899 | ||
900 | video->streaming->cur_format = format; | |
901 | video->streaming->cur_frame = frame; | |
902 | atomic_set(&video->active, 0); | |
903 | ||
904 | /* Select the video decoding function */ | |
905 | if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
906 | video->decode = uvc_video_decode_isight; | |
907 | else if (video->streaming->intf->num_altsetting > 1) | |
908 | video->decode = uvc_video_decode_isoc; | |
909 | else | |
910 | video->decode = uvc_video_decode_bulk; | |
911 | ||
912 | return 0; | |
913 | } | |
914 | ||
915 | /* | |
916 | * Enable or disable the video stream. | |
917 | */ | |
918 | int uvc_video_enable(struct uvc_video_device *video, int enable) | |
919 | { | |
920 | int ret; | |
921 | ||
922 | if (!enable) { | |
923 | uvc_uninit_video(video); | |
924 | usb_set_interface(video->dev->udev, | |
925 | video->streaming->intfnum, 0); | |
926 | uvc_queue_enable(&video->queue, 0); | |
927 | return 0; | |
928 | } | |
929 | ||
930 | if ((ret = uvc_queue_enable(&video->queue, 1)) < 0) | |
931 | return ret; | |
932 | ||
933 | return uvc_init_video(video); | |
934 | } |