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Commit | Line | Data |
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c0efd232 LP |
1 | /* |
2 | * uvc_video.c -- USB Video Class driver - Video handling | |
3 | * | |
11fc5baf LP |
4 | * Copyright (C) 2005-2010 |
5 | * Laurent Pinchart (laurent.pinchart@ideasonboard.com) | |
c0efd232 LP |
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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
c0efd232 LP |
18 | #include <linux/usb.h> |
19 | #include <linux/videodev2.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/wait.h> | |
60063497 | 22 | #include <linux/atomic.h> |
c0efd232 LP |
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; | |
c0efd232 LP |
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 | ||
44f0079e | 44 | return usb_control_msg(dev->udev, pipe, query, type, cs << 8, |
c0efd232 | 45 | unit << 8 | intfnum, data, size, timeout); |
44f0079e LP |
46 | } |
47 | ||
707dcd90 LP |
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 | ||
44f0079e LP |
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; | |
c0efd232 | 76 | |
44f0079e LP |
77 | ret = __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, |
78 | UVC_CTRL_CONTROL_TIMEOUT); | |
c0efd232 | 79 | if (ret != size) { |
707dcd90 LP |
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); | |
c0efd232 LP |
83 | return -EIO; |
84 | } | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
35f02a68 | 89 | static void uvc_fixup_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
90 | struct uvc_streaming_control *ctrl) |
91 | { | |
38a66824 | 92 | struct uvc_format *format = NULL; |
078f8947 LP |
93 | struct uvc_frame *frame = NULL; |
94 | unsigned int i; | |
c0efd232 | 95 | |
38a66824 SL |
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 | } | |
c0efd232 | 102 | |
38a66824 SL |
103 | if (format == NULL) |
104 | return; | |
c0efd232 | 105 | |
078f8947 LP |
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 | } | |
c0efd232 | 112 | |
078f8947 LP |
113 | if (frame == NULL) |
114 | return; | |
c0efd232 LP |
115 | |
116 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || | |
117 | (ctrl->dwMaxVideoFrameSize == 0 && | |
35f02a68 | 118 | stream->dev->uvc_version < 0x0110)) |
c0efd232 LP |
119 | ctrl->dwMaxVideoFrameSize = |
120 | frame->dwMaxVideoFrameBufferSize; | |
50144aee | 121 | |
a2e35af6 LP |
122 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) && |
123 | stream->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH && | |
35f02a68 | 124 | stream->intf->num_altsetting > 1) { |
50144aee LP |
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; | |
35f02a68 | 141 | if (stream->dev->udev->speed == USB_SPEED_HIGH) |
50144aee LP |
142 | bandwidth /= 8; |
143 | bandwidth += 12; | |
144 | ||
9bb7262d LP |
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 | ||
50144aee LP |
154 | ctrl->dwMaxPayloadTransferSize = bandwidth; |
155 | } | |
c0efd232 LP |
156 | } |
157 | ||
35f02a68 | 158 | static int uvc_get_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
159 | struct uvc_streaming_control *ctrl, int probe, __u8 query) |
160 | { | |
04793dd0 LP |
161 | __u8 *data; |
162 | __u16 size; | |
c0efd232 LP |
163 | int ret; |
164 | ||
35f02a68 | 165 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; |
d2be7643 JL |
166 | if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) && |
167 | query == UVC_GET_DEF) | |
168 | return -EIO; | |
169 | ||
04793dd0 LP |
170 | data = kmalloc(size, GFP_KERNEL); |
171 | if (data == NULL) | |
172 | return -ENOMEM; | |
173 | ||
35f02a68 | 174 | ret = __uvc_query_ctrl(stream->dev, query, 0, stream->intfnum, |
b482d923 | 175 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, |
b232a012 | 176 | size, uvc_timeout_param); |
44f0079e | 177 | |
b482d923 | 178 | if ((query == UVC_GET_MIN || query == UVC_GET_MAX) && ret == 2) { |
44f0079e LP |
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 | */ | |
35f02a68 | 183 | uvc_warn_once(stream->dev, UVC_WARN_MINMAX, "UVC non " |
44f0079e LP |
184 | "compliance - GET_MIN/MAX(PROBE) incorrectly " |
185 | "supported. Enabling workaround.\n"); | |
ddb0b34f | 186 | memset(ctrl, 0, sizeof *ctrl); |
44f0079e LP |
187 | ctrl->wCompQuality = le16_to_cpup((__le16 *)data); |
188 | ret = 0; | |
04793dd0 | 189 | goto out; |
b482d923 | 190 | } else if (query == UVC_GET_DEF && probe == 1 && ret != size) { |
44f0079e LP |
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 | */ | |
35f02a68 | 195 | uvc_warn_once(stream->dev, UVC_WARN_PROBE_DEF, "UVC non " |
44f0079e LP |
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 | } | |
c0efd232 LP |
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]); | |
4d3939f6 LP |
217 | ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]); |
218 | ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]); | |
c0efd232 LP |
219 | |
220 | if (size == 34) { | |
4d3939f6 | 221 | ctrl->dwClockFrequency = get_unaligned_le32(&data[26]); |
c0efd232 LP |
222 | ctrl->bmFramingInfo = data[30]; |
223 | ctrl->bPreferedVersion = data[31]; | |
224 | ctrl->bMinVersion = data[32]; | |
225 | ctrl->bMaxVersion = data[33]; | |
226 | } else { | |
35f02a68 | 227 | ctrl->dwClockFrequency = stream->dev->clock_frequency; |
c0efd232 LP |
228 | ctrl->bmFramingInfo = 0; |
229 | ctrl->bPreferedVersion = 0; | |
230 | ctrl->bMinVersion = 0; | |
231 | ctrl->bMaxVersion = 0; | |
232 | } | |
233 | ||
50144aee LP |
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. | |
c0efd232 | 237 | */ |
35f02a68 | 238 | uvc_fixup_video_ctrl(stream, ctrl); |
44f0079e | 239 | ret = 0; |
c0efd232 | 240 | |
04793dd0 LP |
241 | out: |
242 | kfree(data); | |
243 | return ret; | |
c0efd232 LP |
244 | } |
245 | ||
35f02a68 | 246 | static int uvc_set_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
247 | struct uvc_streaming_control *ctrl, int probe) |
248 | { | |
04793dd0 LP |
249 | __u8 *data; |
250 | __u16 size; | |
251 | int ret; | |
c0efd232 | 252 | |
35f02a68 | 253 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; |
04793dd0 LP |
254 | data = kzalloc(size, GFP_KERNEL); |
255 | if (data == NULL) | |
256 | return -ENOMEM; | |
c0efd232 LP |
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); | |
4d3939f6 LP |
267 | put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]); |
268 | put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]); | |
c0efd232 LP |
269 | |
270 | if (size == 34) { | |
4d3939f6 | 271 | put_unaligned_le32(ctrl->dwClockFrequency, &data[26]); |
c0efd232 LP |
272 | data[30] = ctrl->bmFramingInfo; |
273 | data[31] = ctrl->bPreferedVersion; | |
274 | data[32] = ctrl->bMinVersion; | |
275 | data[33] = ctrl->bMaxVersion; | |
276 | } | |
277 | ||
35f02a68 | 278 | ret = __uvc_query_ctrl(stream->dev, UVC_SET_CUR, 0, stream->intfnum, |
b482d923 | 279 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, |
b232a012 | 280 | size, uvc_timeout_param); |
44f0079e LP |
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 | } | |
04793dd0 LP |
287 | |
288 | kfree(data); | |
289 | return ret; | |
c0efd232 LP |
290 | } |
291 | ||
35f02a68 | 292 | int uvc_probe_video(struct uvc_streaming *stream, |
c0efd232 LP |
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 | ||
c0efd232 LP |
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 | */ | |
35f02a68 LP |
307 | ret = uvc_set_video_ctrl(stream, probe, 1); |
308 | if (ret < 0) | |
c0efd232 LP |
309 | goto done; |
310 | ||
311 | /* Get the minimum and maximum values for compression settings. */ | |
35f02a68 LP |
312 | if (!(stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { |
313 | ret = uvc_get_video_ctrl(stream, &probe_min, 1, UVC_GET_MIN); | |
c0efd232 LP |
314 | if (ret < 0) |
315 | goto done; | |
35f02a68 | 316 | ret = uvc_get_video_ctrl(stream, &probe_max, 1, UVC_GET_MAX); |
c0efd232 LP |
317 | if (ret < 0) |
318 | goto done; | |
319 | ||
320 | probe->wCompQuality = probe_max.wCompQuality; | |
321 | } | |
322 | ||
323 | for (i = 0; i < 2; ++i) { | |
35f02a68 | 324 | ret = uvc_set_video_ctrl(stream, probe, 1); |
b482d923 LP |
325 | if (ret < 0) |
326 | goto done; | |
35f02a68 | 327 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 328 | if (ret < 0) |
c0efd232 LP |
329 | goto done; |
330 | ||
35f02a68 | 331 | if (stream->intf->num_altsetting == 1) |
c0efd232 LP |
332 | break; |
333 | ||
334 | bandwidth = probe->dwMaxPayloadTransferSize; | |
35f02a68 | 335 | if (bandwidth <= stream->maxpsize) |
c0efd232 LP |
336 | break; |
337 | ||
35f02a68 | 338 | if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { |
c0efd232 LP |
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: | |
c0efd232 LP |
351 | return ret; |
352 | } | |
353 | ||
35f02a68 | 354 | int uvc_commit_video(struct uvc_streaming *stream, |
44f0079e LP |
355 | struct uvc_streaming_control *probe) |
356 | { | |
35f02a68 | 357 | return uvc_set_video_ctrl(stream, probe, 0); |
44f0079e LP |
358 | } |
359 | ||
c0efd232 LP |
360 | /* ------------------------------------------------------------------------ |
361 | * Video codecs | |
362 | */ | |
363 | ||
c0efd232 LP |
364 | /* Video payload decoding is handled by uvc_video_decode_start(), |
365 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
366 | * | |
367 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
368 | * isochronous payload. It processes header data and returns the header size | |
369 | * in bytes if successful. If an error occurs, it returns a negative error | |
370 | * code. The following error codes have special meanings. | |
371 | * | |
372 | * - EAGAIN informs the caller that the current video buffer should be marked | |
373 | * as done, and that the function should be called again with the same data | |
374 | * and a new video buffer. This is used when end of frame conditions can be | |
375 | * reliably detected at the beginning of the next frame only. | |
376 | * | |
377 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
378 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
379 | * made until the next payload. -ENODATA can be used to drop the current | |
380 | * payload if no other error code is appropriate. | |
381 | * | |
382 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
383 | * data to the video buffer. | |
384 | * | |
385 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
386 | * isochronous payload. It performs any additional header data processing and | |
25985edc | 387 | * returns 0 or a negative error code if an error occurred. As header data have |
c0efd232 LP |
388 | * already been processed by uvc_video_decode_start, this functions isn't |
389 | * required to perform sanity checks a second time. | |
390 | * | |
25985edc | 391 | * For isochronous transfers where a payload is always transferred in a single |
c0efd232 LP |
392 | * URB, the three functions will be called in a row. |
393 | * | |
394 | * To let the decoder process header data and update its internal state even | |
395 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
396 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
397 | * uvc_video_decode_end will never be called with a NULL buffer. | |
398 | */ | |
35f02a68 | 399 | static int uvc_video_decode_start(struct uvc_streaming *stream, |
c0efd232 LP |
400 | struct uvc_buffer *buf, const __u8 *data, int len) |
401 | { | |
402 | __u8 fid; | |
403 | ||
404 | /* Sanity checks: | |
405 | * - packet must be at least 2 bytes long | |
406 | * - bHeaderLength value must be at least 2 bytes (see above) | |
407 | * - bHeaderLength value can't be larger than the packet size. | |
408 | */ | |
409 | if (len < 2 || data[0] < 2 || data[0] > len) | |
410 | return -EINVAL; | |
411 | ||
412 | /* Skip payloads marked with the error bit ("error frames"). */ | |
413 | if (data[1] & UVC_STREAM_ERR) { | |
414 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | |
415 | "set).\n"); | |
416 | return -ENODATA; | |
417 | } | |
418 | ||
419 | fid = data[1] & UVC_STREAM_FID; | |
420 | ||
650b95fe LP |
421 | /* Increase the sequence number regardless of any buffer states, so |
422 | * that discontinuous sequence numbers always indicate lost frames. | |
423 | */ | |
424 | if (stream->last_fid != fid) | |
425 | stream->sequence++; | |
426 | ||
c0efd232 LP |
427 | /* Store the payload FID bit and return immediately when the buffer is |
428 | * NULL. | |
429 | */ | |
430 | if (buf == NULL) { | |
35f02a68 | 431 | stream->last_fid = fid; |
c0efd232 LP |
432 | return -ENODATA; |
433 | } | |
434 | ||
435 | /* Synchronize to the input stream by waiting for the FID bit to be | |
436 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
35f02a68 | 437 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
438 | * frame will always be in sync. |
439 | * | |
35f02a68 | 440 | * If the device doesn't toggle the FID bit, invert stream->last_fid |
c0efd232 LP |
441 | * when the EOF bit is set to force synchronisation on the next packet. |
442 | */ | |
443 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
310fe524 LP |
444 | struct timespec ts; |
445 | ||
35f02a68 | 446 | if (fid == stream->last_fid) { |
c0efd232 LP |
447 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " |
448 | "sync).\n"); | |
35f02a68 | 449 | if ((stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && |
c0efd232 | 450 | (data[1] & UVC_STREAM_EOF)) |
35f02a68 | 451 | stream->last_fid ^= UVC_STREAM_FID; |
c0efd232 LP |
452 | return -ENODATA; |
453 | } | |
454 | ||
310fe524 LP |
455 | if (uvc_clock_param == CLOCK_MONOTONIC) |
456 | ktime_get_ts(&ts); | |
457 | else | |
458 | ktime_get_real_ts(&ts); | |
459 | ||
6998b6fb LP |
460 | buf->buf.v4l2_buf.sequence = stream->sequence; |
461 | buf->buf.v4l2_buf.timestamp.tv_sec = ts.tv_sec; | |
462 | buf->buf.v4l2_buf.timestamp.tv_usec = | |
463 | ts.tv_nsec / NSEC_PER_USEC; | |
310fe524 | 464 | |
c0efd232 LP |
465 | /* TODO: Handle PTS and SCR. */ |
466 | buf->state = UVC_BUF_STATE_ACTIVE; | |
467 | } | |
468 | ||
469 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
470 | * End of frame detection is better implemented by checking the EOF | |
471 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
472 | * bit), but some devices don't set the bit at end of frame (and the | |
473 | * last payload can be lost anyway). We thus must check if the FID has | |
474 | * been toggled. | |
475 | * | |
35f02a68 | 476 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
477 | * frame will never trigger an end of frame detection. |
478 | * | |
479 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
480 | * as it doesn't make sense to return an empty buffer. This also | |
2c2d264b | 481 | * avoids detecting end of frame conditions at FID toggling if the |
c0efd232 LP |
482 | * previous payload had the EOF bit set. |
483 | */ | |
3d95e932 | 484 | if (fid != stream->last_fid && buf->bytesused != 0) { |
c0efd232 LP |
485 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " |
486 | "toggled).\n"); | |
d7c0d439 | 487 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
488 | return -EAGAIN; |
489 | } | |
490 | ||
35f02a68 | 491 | stream->last_fid = fid; |
c0efd232 LP |
492 | |
493 | return data[0]; | |
494 | } | |
495 | ||
35f02a68 | 496 | static void uvc_video_decode_data(struct uvc_streaming *stream, |
c0efd232 LP |
497 | struct uvc_buffer *buf, const __u8 *data, int len) |
498 | { | |
c0efd232 LP |
499 | unsigned int maxlen, nbytes; |
500 | void *mem; | |
501 | ||
502 | if (len <= 0) | |
503 | return; | |
504 | ||
505 | /* Copy the video data to the buffer. */ | |
3d95e932 LP |
506 | maxlen = buf->length - buf->bytesused; |
507 | mem = buf->mem + buf->bytesused; | |
c0efd232 LP |
508 | nbytes = min((unsigned int)len, maxlen); |
509 | memcpy(mem, data, nbytes); | |
3d95e932 | 510 | buf->bytesused += nbytes; |
c0efd232 LP |
511 | |
512 | /* Complete the current frame if the buffer size was exceeded. */ | |
513 | if (len > maxlen) { | |
514 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
d7c0d439 | 515 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
516 | } |
517 | } | |
518 | ||
35f02a68 | 519 | static void uvc_video_decode_end(struct uvc_streaming *stream, |
c0efd232 LP |
520 | struct uvc_buffer *buf, const __u8 *data, int len) |
521 | { | |
522 | /* Mark the buffer as done if the EOF marker is set. */ | |
3d95e932 | 523 | if (data[1] & UVC_STREAM_EOF && buf->bytesused != 0) { |
c0efd232 LP |
524 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); |
525 | if (data[0] == len) | |
526 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
d7c0d439 | 527 | buf->state = UVC_BUF_STATE_READY; |
35f02a68 LP |
528 | if (stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) |
529 | stream->last_fid ^= UVC_STREAM_FID; | |
c0efd232 LP |
530 | } |
531 | } | |
532 | ||
2c2d264b LP |
533 | /* Video payload encoding is handled by uvc_video_encode_header() and |
534 | * uvc_video_encode_data(). Only bulk transfers are currently supported. | |
535 | * | |
536 | * uvc_video_encode_header is called at the start of a payload. It adds header | |
537 | * data to the transfer buffer and returns the header size. As the only known | |
538 | * UVC output device transfers a whole frame in a single payload, the EOF bit | |
539 | * is always set in the header. | |
540 | * | |
541 | * uvc_video_encode_data is called for every URB and copies the data from the | |
542 | * video buffer to the transfer buffer. | |
543 | */ | |
35f02a68 | 544 | static int uvc_video_encode_header(struct uvc_streaming *stream, |
ff924203 LP |
545 | struct uvc_buffer *buf, __u8 *data, int len) |
546 | { | |
547 | data[0] = 2; /* Header length */ | |
548 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | |
35f02a68 | 549 | | (stream->last_fid & UVC_STREAM_FID); |
ff924203 LP |
550 | return 2; |
551 | } | |
552 | ||
35f02a68 | 553 | static int uvc_video_encode_data(struct uvc_streaming *stream, |
ff924203 LP |
554 | struct uvc_buffer *buf, __u8 *data, int len) |
555 | { | |
35f02a68 | 556 | struct uvc_video_queue *queue = &stream->queue; |
ff924203 LP |
557 | unsigned int nbytes; |
558 | void *mem; | |
559 | ||
560 | /* Copy video data to the URB buffer. */ | |
3d95e932 LP |
561 | mem = buf->mem + queue->buf_used; |
562 | nbytes = min((unsigned int)len, buf->bytesused - queue->buf_used); | |
35f02a68 | 563 | nbytes = min(stream->bulk.max_payload_size - stream->bulk.payload_size, |
ff924203 LP |
564 | nbytes); |
565 | memcpy(data, mem, nbytes); | |
566 | ||
567 | queue->buf_used += nbytes; | |
568 | ||
569 | return nbytes; | |
570 | } | |
571 | ||
c0efd232 LP |
572 | /* ------------------------------------------------------------------------ |
573 | * URB handling | |
574 | */ | |
575 | ||
576 | /* | |
577 | * Completion handler for video URBs. | |
578 | */ | |
35f02a68 LP |
579 | static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream, |
580 | struct uvc_buffer *buf) | |
c0efd232 LP |
581 | { |
582 | u8 *mem; | |
583 | int ret, i; | |
584 | ||
585 | for (i = 0; i < urb->number_of_packets; ++i) { | |
586 | if (urb->iso_frame_desc[i].status < 0) { | |
587 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
588 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
9bde9f26 LP |
589 | /* Mark the buffer as faulty. */ |
590 | if (buf != NULL) | |
591 | buf->error = 1; | |
c0efd232 LP |
592 | continue; |
593 | } | |
594 | ||
595 | /* Decode the payload header. */ | |
596 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
597 | do { | |
35f02a68 | 598 | ret = uvc_video_decode_start(stream, buf, mem, |
c0efd232 LP |
599 | urb->iso_frame_desc[i].actual_length); |
600 | if (ret == -EAGAIN) | |
35f02a68 LP |
601 | buf = uvc_queue_next_buffer(&stream->queue, |
602 | buf); | |
c0efd232 LP |
603 | } while (ret == -EAGAIN); |
604 | ||
605 | if (ret < 0) | |
606 | continue; | |
607 | ||
608 | /* Decode the payload data. */ | |
35f02a68 | 609 | uvc_video_decode_data(stream, buf, mem + ret, |
c0efd232 LP |
610 | urb->iso_frame_desc[i].actual_length - ret); |
611 | ||
612 | /* Process the header again. */ | |
35f02a68 | 613 | uvc_video_decode_end(stream, buf, mem, |
08ebd003 | 614 | urb->iso_frame_desc[i].actual_length); |
c0efd232 | 615 | |
9bde9f26 | 616 | if (buf->state == UVC_BUF_STATE_READY) { |
3d95e932 | 617 | if (buf->length != buf->bytesused && |
9bde9f26 LP |
618 | !(stream->cur_format->flags & |
619 | UVC_FMT_FLAG_COMPRESSED)) | |
620 | buf->error = 1; | |
621 | ||
35f02a68 | 622 | buf = uvc_queue_next_buffer(&stream->queue, buf); |
9bde9f26 | 623 | } |
c0efd232 LP |
624 | } |
625 | } | |
626 | ||
35f02a68 LP |
627 | static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream, |
628 | struct uvc_buffer *buf) | |
c0efd232 LP |
629 | { |
630 | u8 *mem; | |
631 | int len, ret; | |
632 | ||
c90e7779 LP |
633 | if (urb->actual_length == 0) |
634 | return; | |
635 | ||
c0efd232 LP |
636 | mem = urb->transfer_buffer; |
637 | len = urb->actual_length; | |
35f02a68 | 638 | stream->bulk.payload_size += len; |
c0efd232 LP |
639 | |
640 | /* If the URB is the first of its payload, decode and save the | |
641 | * header. | |
642 | */ | |
35f02a68 | 643 | if (stream->bulk.header_size == 0 && !stream->bulk.skip_payload) { |
c0efd232 | 644 | do { |
35f02a68 | 645 | ret = uvc_video_decode_start(stream, buf, mem, len); |
c0efd232 | 646 | if (ret == -EAGAIN) |
35f02a68 LP |
647 | buf = uvc_queue_next_buffer(&stream->queue, |
648 | buf); | |
c0efd232 LP |
649 | } while (ret == -EAGAIN); |
650 | ||
25985edc | 651 | /* If an error occurred skip the rest of the payload. */ |
c0efd232 | 652 | if (ret < 0 || buf == NULL) { |
35f02a68 | 653 | stream->bulk.skip_payload = 1; |
f8dd4af6 | 654 | } else { |
35f02a68 LP |
655 | memcpy(stream->bulk.header, mem, ret); |
656 | stream->bulk.header_size = ret; | |
c0efd232 | 657 | |
f8dd4af6 LP |
658 | mem += ret; |
659 | len -= ret; | |
660 | } | |
c0efd232 LP |
661 | } |
662 | ||
663 | /* The buffer queue might have been cancelled while a bulk transfer | |
664 | * was in progress, so we can reach here with buf equal to NULL. Make | |
665 | * sure buf is never dereferenced if NULL. | |
666 | */ | |
667 | ||
668 | /* Process video data. */ | |
35f02a68 LP |
669 | if (!stream->bulk.skip_payload && buf != NULL) |
670 | uvc_video_decode_data(stream, buf, mem, len); | |
c0efd232 LP |
671 | |
672 | /* Detect the payload end by a URB smaller than the maximum size (or | |
673 | * a payload size equal to the maximum) and process the header again. | |
674 | */ | |
675 | if (urb->actual_length < urb->transfer_buffer_length || | |
35f02a68 LP |
676 | stream->bulk.payload_size >= stream->bulk.max_payload_size) { |
677 | if (!stream->bulk.skip_payload && buf != NULL) { | |
678 | uvc_video_decode_end(stream, buf, stream->bulk.header, | |
679 | stream->bulk.payload_size); | |
d7c0d439 | 680 | if (buf->state == UVC_BUF_STATE_READY) |
35f02a68 LP |
681 | buf = uvc_queue_next_buffer(&stream->queue, |
682 | buf); | |
c0efd232 LP |
683 | } |
684 | ||
35f02a68 LP |
685 | stream->bulk.header_size = 0; |
686 | stream->bulk.skip_payload = 0; | |
687 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
688 | } |
689 | } | |
690 | ||
35f02a68 LP |
691 | static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream, |
692 | struct uvc_buffer *buf) | |
ff924203 LP |
693 | { |
694 | u8 *mem = urb->transfer_buffer; | |
35f02a68 | 695 | int len = stream->urb_size, ret; |
ff924203 LP |
696 | |
697 | if (buf == NULL) { | |
698 | urb->transfer_buffer_length = 0; | |
699 | return; | |
700 | } | |
701 | ||
702 | /* If the URB is the first of its payload, add the header. */ | |
35f02a68 LP |
703 | if (stream->bulk.header_size == 0) { |
704 | ret = uvc_video_encode_header(stream, buf, mem, len); | |
705 | stream->bulk.header_size = ret; | |
706 | stream->bulk.payload_size += ret; | |
ff924203 LP |
707 | mem += ret; |
708 | len -= ret; | |
709 | } | |
710 | ||
711 | /* Process video data. */ | |
35f02a68 | 712 | ret = uvc_video_encode_data(stream, buf, mem, len); |
ff924203 | 713 | |
35f02a68 | 714 | stream->bulk.payload_size += ret; |
ff924203 LP |
715 | len -= ret; |
716 | ||
3d95e932 | 717 | if (buf->bytesused == stream->queue.buf_used || |
35f02a68 | 718 | stream->bulk.payload_size == stream->bulk.max_payload_size) { |
3d95e932 | 719 | if (buf->bytesused == stream->queue.buf_used) { |
35f02a68 | 720 | stream->queue.buf_used = 0; |
d7c0d439 | 721 | buf->state = UVC_BUF_STATE_READY; |
6998b6fb | 722 | buf->buf.v4l2_buf.sequence = ++stream->sequence; |
35f02a68 LP |
723 | uvc_queue_next_buffer(&stream->queue, buf); |
724 | stream->last_fid ^= UVC_STREAM_FID; | |
ff924203 LP |
725 | } |
726 | ||
35f02a68 LP |
727 | stream->bulk.header_size = 0; |
728 | stream->bulk.payload_size = 0; | |
ff924203 LP |
729 | } |
730 | ||
35f02a68 | 731 | urb->transfer_buffer_length = stream->urb_size - len; |
ff924203 LP |
732 | } |
733 | ||
c0efd232 LP |
734 | static void uvc_video_complete(struct urb *urb) |
735 | { | |
35f02a68 LP |
736 | struct uvc_streaming *stream = urb->context; |
737 | struct uvc_video_queue *queue = &stream->queue; | |
c0efd232 LP |
738 | struct uvc_buffer *buf = NULL; |
739 | unsigned long flags; | |
740 | int ret; | |
741 | ||
742 | switch (urb->status) { | |
743 | case 0: | |
744 | break; | |
745 | ||
746 | default: | |
747 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
748 | "completion handler.\n", urb->status); | |
749 | ||
750 | case -ENOENT: /* usb_kill_urb() called. */ | |
35f02a68 | 751 | if (stream->frozen) |
c0efd232 LP |
752 | return; |
753 | ||
754 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
755 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
756 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
757 | return; | |
758 | } | |
759 | ||
760 | spin_lock_irqsave(&queue->irqlock, flags); | |
761 | if (!list_empty(&queue->irqqueue)) | |
762 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
763 | queue); | |
764 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
765 | ||
35f02a68 | 766 | stream->decode(urb, stream, buf); |
c0efd232 LP |
767 | |
768 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
769 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
770 | ret); | |
771 | } | |
772 | } | |
773 | ||
e01117c8 LP |
774 | /* |
775 | * Free transfer buffers. | |
776 | */ | |
35f02a68 | 777 | static void uvc_free_urb_buffers(struct uvc_streaming *stream) |
e01117c8 LP |
778 | { |
779 | unsigned int i; | |
780 | ||
781 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 | 782 | if (stream->urb_buffer[i]) { |
3e0ac671 | 783 | #ifndef CONFIG_DMA_NONCOHERENT |
997ea58e | 784 | usb_free_coherent(stream->dev->udev, stream->urb_size, |
35f02a68 | 785 | stream->urb_buffer[i], stream->urb_dma[i]); |
3e0ac671 AC |
786 | #else |
787 | kfree(stream->urb_buffer[i]); | |
788 | #endif | |
35f02a68 | 789 | stream->urb_buffer[i] = NULL; |
e01117c8 LP |
790 | } |
791 | } | |
792 | ||
35f02a68 | 793 | stream->urb_size = 0; |
e01117c8 LP |
794 | } |
795 | ||
796 | /* | |
797 | * Allocate transfer buffers. This function can be called with buffers | |
798 | * already allocated when resuming from suspend, in which case it will | |
799 | * return without touching the buffers. | |
800 | * | |
efdc8a95 LP |
801 | * Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the |
802 | * system is too low on memory try successively smaller numbers of packets | |
803 | * until allocation succeeds. | |
804 | * | |
805 | * Return the number of allocated packets on success or 0 when out of memory. | |
e01117c8 | 806 | */ |
35f02a68 | 807 | static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, |
efdc8a95 | 808 | unsigned int size, unsigned int psize, gfp_t gfp_flags) |
e01117c8 | 809 | { |
efdc8a95 | 810 | unsigned int npackets; |
e01117c8 LP |
811 | unsigned int i; |
812 | ||
813 | /* Buffers are already allocated, bail out. */ | |
35f02a68 LP |
814 | if (stream->urb_size) |
815 | return stream->urb_size / psize; | |
e01117c8 | 816 | |
efdc8a95 | 817 | /* Compute the number of packets. Bulk endpoints might transfer UVC |
25985edc | 818 | * payloads across multiple URBs. |
efdc8a95 LP |
819 | */ |
820 | npackets = DIV_ROUND_UP(size, psize); | |
821 | if (npackets > UVC_MAX_PACKETS) | |
822 | npackets = UVC_MAX_PACKETS; | |
823 | ||
824 | /* Retry allocations until one succeed. */ | |
825 | for (; npackets > 1; npackets /= 2) { | |
826 | for (i = 0; i < UVC_URBS; ++i) { | |
fd1b6bbb | 827 | stream->urb_size = psize * npackets; |
3e0ac671 | 828 | #ifndef CONFIG_DMA_NONCOHERENT |
997ea58e | 829 | stream->urb_buffer[i] = usb_alloc_coherent( |
fd1b6bbb | 830 | stream->dev->udev, stream->urb_size, |
35f02a68 | 831 | gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]); |
3e0ac671 AC |
832 | #else |
833 | stream->urb_buffer[i] = | |
834 | kmalloc(stream->urb_size, gfp_flags | __GFP_NOWARN); | |
835 | #endif | |
35f02a68 LP |
836 | if (!stream->urb_buffer[i]) { |
837 | uvc_free_urb_buffers(stream); | |
efdc8a95 LP |
838 | break; |
839 | } | |
840 | } | |
841 | ||
842 | if (i == UVC_URBS) { | |
663a4192 LP |
843 | uvc_trace(UVC_TRACE_VIDEO, "Allocated %u URB buffers " |
844 | "of %ux%u bytes each.\n", UVC_URBS, npackets, | |
845 | psize); | |
efdc8a95 | 846 | return npackets; |
e01117c8 LP |
847 | } |
848 | } | |
849 | ||
663a4192 LP |
850 | uvc_trace(UVC_TRACE_VIDEO, "Failed to allocate URB buffers (%u bytes " |
851 | "per packet).\n", psize); | |
e01117c8 LP |
852 | return 0; |
853 | } | |
854 | ||
c0efd232 LP |
855 | /* |
856 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
857 | */ | |
35f02a68 | 858 | static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) |
c0efd232 LP |
859 | { |
860 | struct urb *urb; | |
861 | unsigned int i; | |
862 | ||
863 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
864 | urb = stream->urb[i]; |
865 | if (urb == NULL) | |
c0efd232 LP |
866 | continue; |
867 | ||
868 | usb_kill_urb(urb); | |
c0efd232 | 869 | usb_free_urb(urb); |
35f02a68 | 870 | stream->urb[i] = NULL; |
c0efd232 | 871 | } |
e01117c8 LP |
872 | |
873 | if (free_buffers) | |
35f02a68 | 874 | uvc_free_urb_buffers(stream); |
c0efd232 LP |
875 | } |
876 | ||
877 | /* | |
878 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
879 | * is given by the endpoint. | |
880 | */ | |
35f02a68 | 881 | static int uvc_init_video_isoc(struct uvc_streaming *stream, |
29135878 | 882 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
883 | { |
884 | struct urb *urb; | |
885 | unsigned int npackets, i, j; | |
efdc8a95 LP |
886 | u16 psize; |
887 | u32 size; | |
c0efd232 | 888 | |
c0efd232 LP |
889 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
890 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
35f02a68 | 891 | size = stream->ctrl.dwMaxVideoFrameSize; |
c0efd232 | 892 | |
35f02a68 | 893 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 LP |
894 | if (npackets == 0) |
895 | return -ENOMEM; | |
c0efd232 LP |
896 | |
897 | size = npackets * psize; | |
898 | ||
899 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 900 | urb = usb_alloc_urb(npackets, gfp_flags); |
c0efd232 | 901 | if (urb == NULL) { |
35f02a68 | 902 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
903 | return -ENOMEM; |
904 | } | |
905 | ||
35f02a68 LP |
906 | urb->dev = stream->dev->udev; |
907 | urb->context = stream; | |
908 | urb->pipe = usb_rcvisocpipe(stream->dev->udev, | |
c0efd232 | 909 | ep->desc.bEndpointAddress); |
3e0ac671 | 910 | #ifndef CONFIG_DMA_NONCOHERENT |
c0efd232 | 911 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
3e0ac671 AC |
912 | urb->transfer_dma = stream->urb_dma[i]; |
913 | #else | |
914 | urb->transfer_flags = URB_ISO_ASAP; | |
915 | #endif | |
c0efd232 | 916 | urb->interval = ep->desc.bInterval; |
35f02a68 | 917 | urb->transfer_buffer = stream->urb_buffer[i]; |
c0efd232 LP |
918 | urb->complete = uvc_video_complete; |
919 | urb->number_of_packets = npackets; | |
920 | urb->transfer_buffer_length = size; | |
921 | ||
922 | for (j = 0; j < npackets; ++j) { | |
923 | urb->iso_frame_desc[j].offset = j * psize; | |
924 | urb->iso_frame_desc[j].length = psize; | |
925 | } | |
926 | ||
35f02a68 | 927 | stream->urb[i] = urb; |
c0efd232 LP |
928 | } |
929 | ||
930 | return 0; | |
931 | } | |
932 | ||
933 | /* | |
934 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
935 | * given by the endpoint. | |
936 | */ | |
35f02a68 | 937 | static int uvc_init_video_bulk(struct uvc_streaming *stream, |
29135878 | 938 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
939 | { |
940 | struct urb *urb; | |
efdc8a95 LP |
941 | unsigned int npackets, pipe, i; |
942 | u16 psize; | |
943 | u32 size; | |
944 | ||
c0efd232 | 945 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; |
35f02a68 LP |
946 | size = stream->ctrl.dwMaxPayloadTransferSize; |
947 | stream->bulk.max_payload_size = size; | |
c0efd232 | 948 | |
35f02a68 | 949 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 | 950 | if (npackets == 0) |
e01117c8 LP |
951 | return -ENOMEM; |
952 | ||
efdc8a95 LP |
953 | size = npackets * psize; |
954 | ||
ff924203 | 955 | if (usb_endpoint_dir_in(&ep->desc)) |
35f02a68 | 956 | pipe = usb_rcvbulkpipe(stream->dev->udev, |
ff924203 LP |
957 | ep->desc.bEndpointAddress); |
958 | else | |
35f02a68 | 959 | pipe = usb_sndbulkpipe(stream->dev->udev, |
ff924203 LP |
960 | ep->desc.bEndpointAddress); |
961 | ||
35f02a68 | 962 | if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) |
ff924203 | 963 | size = 0; |
c0efd232 LP |
964 | |
965 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 966 | urb = usb_alloc_urb(0, gfp_flags); |
c0efd232 | 967 | if (urb == NULL) { |
35f02a68 | 968 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
969 | return -ENOMEM; |
970 | } | |
971 | ||
35f02a68 LP |
972 | usb_fill_bulk_urb(urb, stream->dev->udev, pipe, |
973 | stream->urb_buffer[i], size, uvc_video_complete, | |
974 | stream); | |
3e0ac671 | 975 | #ifndef CONFIG_DMA_NONCOHERENT |
c0efd232 | 976 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
35f02a68 | 977 | urb->transfer_dma = stream->urb_dma[i]; |
3e0ac671 | 978 | #endif |
c0efd232 | 979 | |
35f02a68 | 980 | stream->urb[i] = urb; |
c0efd232 LP |
981 | } |
982 | ||
983 | return 0; | |
984 | } | |
985 | ||
986 | /* | |
987 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
988 | */ | |
35f02a68 | 989 | static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags) |
c0efd232 | 990 | { |
35f02a68 | 991 | struct usb_interface *intf = stream->intf; |
2c4d9de8 LP |
992 | struct usb_host_endpoint *ep; |
993 | unsigned int i; | |
c0efd232 LP |
994 | int ret; |
995 | ||
650b95fe | 996 | stream->sequence = -1; |
35f02a68 LP |
997 | stream->last_fid = -1; |
998 | stream->bulk.header_size = 0; | |
999 | stream->bulk.skip_payload = 0; | |
1000 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
1001 | |
1002 | if (intf->num_altsetting > 1) { | |
2c4d9de8 LP |
1003 | struct usb_host_endpoint *best_ep = NULL; |
1004 | unsigned int best_psize = 3 * 1024; | |
1005 | unsigned int bandwidth; | |
1006 | unsigned int uninitialized_var(altsetting); | |
1007 | int intfnum = stream->intfnum; | |
1008 | ||
c0efd232 | 1009 | /* Isochronous endpoint, select the alternate setting. */ |
35f02a68 | 1010 | bandwidth = stream->ctrl.dwMaxPayloadTransferSize; |
c0efd232 LP |
1011 | |
1012 | if (bandwidth == 0) { | |
663a4192 LP |
1013 | uvc_trace(UVC_TRACE_VIDEO, "Device requested null " |
1014 | "bandwidth, defaulting to lowest.\n"); | |
c0efd232 | 1015 | bandwidth = 1; |
663a4192 LP |
1016 | } else { |
1017 | uvc_trace(UVC_TRACE_VIDEO, "Device requested %u " | |
1018 | "B/frame bandwidth.\n", bandwidth); | |
c0efd232 LP |
1019 | } |
1020 | ||
1021 | for (i = 0; i < intf->num_altsetting; ++i) { | |
2c4d9de8 LP |
1022 | struct usb_host_interface *alts; |
1023 | unsigned int psize; | |
1024 | ||
c0efd232 LP |
1025 | alts = &intf->altsetting[i]; |
1026 | ep = uvc_find_endpoint(alts, | |
35f02a68 | 1027 | stream->header.bEndpointAddress); |
c0efd232 LP |
1028 | if (ep == NULL) |
1029 | continue; | |
1030 | ||
1031 | /* Check if the bandwidth is high enough. */ | |
1032 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
1033 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
2c4d9de8 LP |
1034 | if (psize >= bandwidth && psize <= best_psize) { |
1035 | altsetting = i; | |
1036 | best_psize = psize; | |
1037 | best_ep = ep; | |
1038 | } | |
c0efd232 LP |
1039 | } |
1040 | ||
2c4d9de8 | 1041 | if (best_ep == NULL) { |
663a4192 LP |
1042 | uvc_trace(UVC_TRACE_VIDEO, "No fast enough alt setting " |
1043 | "for requested bandwidth.\n"); | |
c0efd232 | 1044 | return -EIO; |
663a4192 | 1045 | } |
c0efd232 | 1046 | |
2c4d9de8 LP |
1047 | uvc_trace(UVC_TRACE_VIDEO, "Selecting alternate setting %u " |
1048 | "(%u B/frame bandwidth).\n", altsetting, best_psize); | |
1049 | ||
1050 | ret = usb_set_interface(stream->dev->udev, intfnum, altsetting); | |
35f02a68 | 1051 | if (ret < 0) |
c0efd232 LP |
1052 | return ret; |
1053 | ||
2c4d9de8 | 1054 | ret = uvc_init_video_isoc(stream, best_ep, gfp_flags); |
c0efd232 LP |
1055 | } else { |
1056 | /* Bulk endpoint, proceed to URB initialization. */ | |
1057 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
35f02a68 | 1058 | stream->header.bEndpointAddress); |
c0efd232 LP |
1059 | if (ep == NULL) |
1060 | return -EIO; | |
1061 | ||
35f02a68 | 1062 | ret = uvc_init_video_bulk(stream, ep, gfp_flags); |
c0efd232 LP |
1063 | } |
1064 | ||
1065 | if (ret < 0) | |
1066 | return ret; | |
1067 | ||
1068 | /* Submit the URBs. */ | |
1069 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
1070 | ret = usb_submit_urb(stream->urb[i], gfp_flags); |
1071 | if (ret < 0) { | |
c0efd232 LP |
1072 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
1073 | "(%d).\n", i, ret); | |
35f02a68 | 1074 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
1075 | return ret; |
1076 | } | |
1077 | } | |
1078 | ||
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | /* -------------------------------------------------------------------------- | |
1083 | * Suspend/resume | |
1084 | */ | |
1085 | ||
1086 | /* | |
1087 | * Stop streaming without disabling the video queue. | |
1088 | * | |
1089 | * To let userspace applications resume without trouble, we must not touch the | |
1090 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
1091 | * completion handler won't try to cancel the queue when we kill the URBs. | |
1092 | */ | |
35f02a68 | 1093 | int uvc_video_suspend(struct uvc_streaming *stream) |
c0efd232 | 1094 | { |
35f02a68 | 1095 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1096 | return 0; |
1097 | ||
35f02a68 LP |
1098 | stream->frozen = 1; |
1099 | uvc_uninit_video(stream, 0); | |
1100 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
c0efd232 LP |
1101 | return 0; |
1102 | } | |
1103 | ||
1104 | /* | |
2c2d264b | 1105 | * Reconfigure the video interface and restart streaming if it was enabled |
c0efd232 LP |
1106 | * before suspend. |
1107 | * | |
1108 | * If an error occurs, disable the video queue. This will wake all pending | |
1109 | * buffers, making sure userspace applications are notified of the problem | |
1110 | * instead of waiting forever. | |
1111 | */ | |
d59a7b1d | 1112 | int uvc_video_resume(struct uvc_streaming *stream, int reset) |
c0efd232 LP |
1113 | { |
1114 | int ret; | |
1115 | ||
d59a7b1d ML |
1116 | /* If the bus has been reset on resume, set the alternate setting to 0. |
1117 | * This should be the default value, but some devices crash or otherwise | |
1118 | * misbehave if they don't receive a SET_INTERFACE request before any | |
1119 | * other video control request. | |
1120 | */ | |
1121 | if (reset) | |
1122 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1123 | ||
35f02a68 | 1124 | stream->frozen = 0; |
c0efd232 | 1125 | |
35f02a68 LP |
1126 | ret = uvc_commit_video(stream, &stream->ctrl); |
1127 | if (ret < 0) { | |
1128 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1129 | return ret; |
1130 | } | |
1131 | ||
35f02a68 | 1132 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1133 | return 0; |
1134 | ||
35f02a68 LP |
1135 | ret = uvc_init_video(stream, GFP_NOIO); |
1136 | if (ret < 0) | |
1137 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1138 | |
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | /* ------------------------------------------------------------------------ | |
1143 | * Video device | |
1144 | */ | |
1145 | ||
1146 | /* | |
2c2d264b LP |
1147 | * Initialize the UVC video device by switching to alternate setting 0 and |
1148 | * retrieve the default format. | |
c0efd232 LP |
1149 | * |
1150 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
1151 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
1152 | * violation, so try to silently fix the values if possible. | |
1153 | * | |
1154 | * This function is called before registering the device with V4L. | |
1155 | */ | |
35f02a68 | 1156 | int uvc_video_init(struct uvc_streaming *stream) |
c0efd232 | 1157 | { |
35f02a68 | 1158 | struct uvc_streaming_control *probe = &stream->ctrl; |
c0efd232 LP |
1159 | struct uvc_format *format = NULL; |
1160 | struct uvc_frame *frame = NULL; | |
1161 | unsigned int i; | |
1162 | int ret; | |
1163 | ||
35f02a68 | 1164 | if (stream->nformats == 0) { |
c0efd232 LP |
1165 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); |
1166 | return -EINVAL; | |
1167 | } | |
1168 | ||
35f02a68 LP |
1169 | atomic_set(&stream->active, 0); |
1170 | ||
1171 | /* Initialize the video buffers queue. */ | |
9bde9f26 | 1172 | uvc_queue_init(&stream->queue, stream->type, !uvc_no_drop_param); |
35f02a68 | 1173 | |
c0efd232 LP |
1174 | /* Alternate setting 0 should be the default, yet the XBox Live Vision |
1175 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
1176 | * they don't receive a SET_INTERFACE request before any other video | |
1177 | * control request. | |
1178 | */ | |
35f02a68 | 1179 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); |
c0efd232 | 1180 | |
72362422 LP |
1181 | /* Set the streaming probe control with default streaming parameters |
1182 | * retrieved from the device. Webcams that don't suport GET_DEF | |
1183 | * requests on the probe control will just keep their current streaming | |
1184 | * parameters. | |
c0efd232 | 1185 | */ |
35f02a68 LP |
1186 | if (uvc_get_video_ctrl(stream, probe, 1, UVC_GET_DEF) == 0) |
1187 | uvc_set_video_ctrl(stream, probe, 1); | |
72362422 LP |
1188 | |
1189 | /* Initialize the streaming parameters with the probe control current | |
1190 | * value. This makes sure SET_CUR requests on the streaming commit | |
1191 | * control will always use values retrieved from a successful GET_CUR | |
1192 | * request on the probe control, as required by the UVC specification. | |
1193 | */ | |
35f02a68 | 1194 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 1195 | if (ret < 0) |
c0efd232 LP |
1196 | return ret; |
1197 | ||
1198 | /* Check if the default format descriptor exists. Use the first | |
1199 | * available format otherwise. | |
1200 | */ | |
35f02a68 LP |
1201 | for (i = stream->nformats; i > 0; --i) { |
1202 | format = &stream->format[i-1]; | |
c0efd232 LP |
1203 | if (format->index == probe->bFormatIndex) |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | if (format->nframes == 0) { | |
1208 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
1209 | "default format.\n"); | |
1210 | return -EINVAL; | |
1211 | } | |
1212 | ||
1213 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
1214 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
1215 | * descriptor with bFrameIndex set to zero. If the default frame | |
078f8947 | 1216 | * descriptor is not found, use the first available frame. |
c0efd232 LP |
1217 | */ |
1218 | for (i = format->nframes; i > 0; --i) { | |
1219 | frame = &format->frame[i-1]; | |
1220 | if (frame->bFrameIndex == probe->bFrameIndex) | |
1221 | break; | |
1222 | } | |
1223 | ||
c0efd232 LP |
1224 | probe->bFormatIndex = format->index; |
1225 | probe->bFrameIndex = frame->bFrameIndex; | |
c0efd232 | 1226 | |
35f02a68 LP |
1227 | stream->cur_format = format; |
1228 | stream->cur_frame = frame; | |
c0efd232 LP |
1229 | |
1230 | /* Select the video decoding function */ | |
35f02a68 LP |
1231 | if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { |
1232 | if (stream->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
1233 | stream->decode = uvc_video_decode_isight; | |
1234 | else if (stream->intf->num_altsetting > 1) | |
1235 | stream->decode = uvc_video_decode_isoc; | |
ff924203 | 1236 | else |
35f02a68 | 1237 | stream->decode = uvc_video_decode_bulk; |
ff924203 | 1238 | } else { |
35f02a68 LP |
1239 | if (stream->intf->num_altsetting == 1) |
1240 | stream->decode = uvc_video_encode_bulk; | |
ff924203 LP |
1241 | else { |
1242 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | |
1243 | "supported for video output devices.\n"); | |
1244 | return -EINVAL; | |
1245 | } | |
1246 | } | |
c0efd232 LP |
1247 | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * Enable or disable the video stream. | |
1253 | */ | |
35f02a68 | 1254 | int uvc_video_enable(struct uvc_streaming *stream, int enable) |
c0efd232 LP |
1255 | { |
1256 | int ret; | |
1257 | ||
1258 | if (!enable) { | |
35f02a68 LP |
1259 | uvc_uninit_video(stream, 1); |
1260 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1261 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1262 | return 0; |
1263 | } | |
1264 | ||
35f02a68 LP |
1265 | ret = uvc_queue_enable(&stream->queue, 1); |
1266 | if (ret < 0) | |
c0efd232 LP |
1267 | return ret; |
1268 | ||
23867b25 | 1269 | /* Commit the streaming parameters. */ |
35f02a68 | 1270 | ret = uvc_commit_video(stream, &stream->ctrl); |
aa122d42 SS |
1271 | if (ret < 0) { |
1272 | uvc_queue_enable(&stream->queue, 0); | |
23867b25 | 1273 | return ret; |
aa122d42 | 1274 | } |
23867b25 | 1275 | |
24c3aae0 LP |
1276 | ret = uvc_init_video(stream, GFP_KERNEL); |
1277 | if (ret < 0) { | |
1278 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1279 | uvc_queue_enable(&stream->queue, 0); | |
1280 | } | |
f87086e3 | 1281 | |
24c3aae0 LP |
1282 | return ret; |
1283 | } |