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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> | |
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; | |
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 | ||
364 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ | |
365 | #define UVC_STREAM_EOH (1 << 7) | |
366 | #define UVC_STREAM_ERR (1 << 6) | |
367 | #define UVC_STREAM_STI (1 << 5) | |
368 | #define UVC_STREAM_RES (1 << 4) | |
369 | #define UVC_STREAM_SCR (1 << 3) | |
370 | #define UVC_STREAM_PTS (1 << 2) | |
371 | #define UVC_STREAM_EOF (1 << 1) | |
372 | #define UVC_STREAM_FID (1 << 0) | |
373 | ||
374 | /* Video payload decoding is handled by uvc_video_decode_start(), | |
375 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
376 | * | |
377 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
378 | * isochronous payload. It processes header data and returns the header size | |
379 | * in bytes if successful. If an error occurs, it returns a negative error | |
380 | * code. The following error codes have special meanings. | |
381 | * | |
382 | * - EAGAIN informs the caller that the current video buffer should be marked | |
383 | * as done, and that the function should be called again with the same data | |
384 | * and a new video buffer. This is used when end of frame conditions can be | |
385 | * reliably detected at the beginning of the next frame only. | |
386 | * | |
387 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
388 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
389 | * made until the next payload. -ENODATA can be used to drop the current | |
390 | * payload if no other error code is appropriate. | |
391 | * | |
392 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
393 | * data to the video buffer. | |
394 | * | |
395 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
396 | * isochronous payload. It performs any additional header data processing and | |
25985edc | 397 | * returns 0 or a negative error code if an error occurred. As header data have |
c0efd232 LP |
398 | * already been processed by uvc_video_decode_start, this functions isn't |
399 | * required to perform sanity checks a second time. | |
400 | * | |
25985edc | 401 | * For isochronous transfers where a payload is always transferred in a single |
c0efd232 LP |
402 | * URB, the three functions will be called in a row. |
403 | * | |
404 | * To let the decoder process header data and update its internal state even | |
405 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
406 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
407 | * uvc_video_decode_end will never be called with a NULL buffer. | |
408 | */ | |
35f02a68 | 409 | static int uvc_video_decode_start(struct uvc_streaming *stream, |
c0efd232 LP |
410 | struct uvc_buffer *buf, const __u8 *data, int len) |
411 | { | |
412 | __u8 fid; | |
413 | ||
414 | /* Sanity checks: | |
415 | * - packet must be at least 2 bytes long | |
416 | * - bHeaderLength value must be at least 2 bytes (see above) | |
417 | * - bHeaderLength value can't be larger than the packet size. | |
418 | */ | |
419 | if (len < 2 || data[0] < 2 || data[0] > len) | |
420 | return -EINVAL; | |
421 | ||
422 | /* Skip payloads marked with the error bit ("error frames"). */ | |
423 | if (data[1] & UVC_STREAM_ERR) { | |
424 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | |
425 | "set).\n"); | |
426 | return -ENODATA; | |
427 | } | |
428 | ||
429 | fid = data[1] & UVC_STREAM_FID; | |
430 | ||
650b95fe LP |
431 | /* Increase the sequence number regardless of any buffer states, so |
432 | * that discontinuous sequence numbers always indicate lost frames. | |
433 | */ | |
434 | if (stream->last_fid != fid) | |
435 | stream->sequence++; | |
436 | ||
c0efd232 LP |
437 | /* Store the payload FID bit and return immediately when the buffer is |
438 | * NULL. | |
439 | */ | |
440 | if (buf == NULL) { | |
35f02a68 | 441 | stream->last_fid = fid; |
c0efd232 LP |
442 | return -ENODATA; |
443 | } | |
444 | ||
445 | /* Synchronize to the input stream by waiting for the FID bit to be | |
446 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
35f02a68 | 447 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
448 | * frame will always be in sync. |
449 | * | |
35f02a68 | 450 | * If the device doesn't toggle the FID bit, invert stream->last_fid |
c0efd232 LP |
451 | * when the EOF bit is set to force synchronisation on the next packet. |
452 | */ | |
453 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
310fe524 LP |
454 | struct timespec ts; |
455 | ||
35f02a68 | 456 | if (fid == stream->last_fid) { |
c0efd232 LP |
457 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " |
458 | "sync).\n"); | |
35f02a68 | 459 | if ((stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && |
c0efd232 | 460 | (data[1] & UVC_STREAM_EOF)) |
35f02a68 | 461 | stream->last_fid ^= UVC_STREAM_FID; |
c0efd232 LP |
462 | return -ENODATA; |
463 | } | |
464 | ||
310fe524 LP |
465 | if (uvc_clock_param == CLOCK_MONOTONIC) |
466 | ktime_get_ts(&ts); | |
467 | else | |
468 | ktime_get_real_ts(&ts); | |
469 | ||
650b95fe | 470 | buf->buf.sequence = stream->sequence; |
310fe524 LP |
471 | buf->buf.timestamp.tv_sec = ts.tv_sec; |
472 | buf->buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; | |
473 | ||
c0efd232 LP |
474 | /* TODO: Handle PTS and SCR. */ |
475 | buf->state = UVC_BUF_STATE_ACTIVE; | |
476 | } | |
477 | ||
478 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
479 | * End of frame detection is better implemented by checking the EOF | |
480 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
481 | * bit), but some devices don't set the bit at end of frame (and the | |
482 | * last payload can be lost anyway). We thus must check if the FID has | |
483 | * been toggled. | |
484 | * | |
35f02a68 | 485 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
486 | * frame will never trigger an end of frame detection. |
487 | * | |
488 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
489 | * as it doesn't make sense to return an empty buffer. This also | |
2c2d264b | 490 | * avoids detecting end of frame conditions at FID toggling if the |
c0efd232 LP |
491 | * previous payload had the EOF bit set. |
492 | */ | |
35f02a68 | 493 | if (fid != stream->last_fid && buf->buf.bytesused != 0) { |
c0efd232 LP |
494 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " |
495 | "toggled).\n"); | |
d7c0d439 | 496 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
497 | return -EAGAIN; |
498 | } | |
499 | ||
35f02a68 | 500 | stream->last_fid = fid; |
c0efd232 LP |
501 | |
502 | return data[0]; | |
503 | } | |
504 | ||
35f02a68 | 505 | static void uvc_video_decode_data(struct uvc_streaming *stream, |
c0efd232 LP |
506 | struct uvc_buffer *buf, const __u8 *data, int len) |
507 | { | |
35f02a68 | 508 | struct uvc_video_queue *queue = &stream->queue; |
c0efd232 LP |
509 | unsigned int maxlen, nbytes; |
510 | void *mem; | |
511 | ||
512 | if (len <= 0) | |
513 | return; | |
514 | ||
515 | /* Copy the video data to the buffer. */ | |
516 | maxlen = buf->buf.length - buf->buf.bytesused; | |
517 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; | |
518 | nbytes = min((unsigned int)len, maxlen); | |
519 | memcpy(mem, data, nbytes); | |
520 | buf->buf.bytesused += nbytes; | |
521 | ||
522 | /* Complete the current frame if the buffer size was exceeded. */ | |
523 | if (len > maxlen) { | |
524 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
d7c0d439 | 525 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
526 | } |
527 | } | |
528 | ||
35f02a68 | 529 | static void uvc_video_decode_end(struct uvc_streaming *stream, |
c0efd232 LP |
530 | struct uvc_buffer *buf, const __u8 *data, int len) |
531 | { | |
532 | /* Mark the buffer as done if the EOF marker is set. */ | |
533 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { | |
534 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); | |
535 | if (data[0] == len) | |
536 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
d7c0d439 | 537 | buf->state = UVC_BUF_STATE_READY; |
35f02a68 LP |
538 | if (stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) |
539 | stream->last_fid ^= UVC_STREAM_FID; | |
c0efd232 LP |
540 | } |
541 | } | |
542 | ||
2c2d264b LP |
543 | /* Video payload encoding is handled by uvc_video_encode_header() and |
544 | * uvc_video_encode_data(). Only bulk transfers are currently supported. | |
545 | * | |
546 | * uvc_video_encode_header is called at the start of a payload. It adds header | |
547 | * data to the transfer buffer and returns the header size. As the only known | |
548 | * UVC output device transfers a whole frame in a single payload, the EOF bit | |
549 | * is always set in the header. | |
550 | * | |
551 | * uvc_video_encode_data is called for every URB and copies the data from the | |
552 | * video buffer to the transfer buffer. | |
553 | */ | |
35f02a68 | 554 | static int uvc_video_encode_header(struct uvc_streaming *stream, |
ff924203 LP |
555 | struct uvc_buffer *buf, __u8 *data, int len) |
556 | { | |
557 | data[0] = 2; /* Header length */ | |
558 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | |
35f02a68 | 559 | | (stream->last_fid & UVC_STREAM_FID); |
ff924203 LP |
560 | return 2; |
561 | } | |
562 | ||
35f02a68 | 563 | static int uvc_video_encode_data(struct uvc_streaming *stream, |
ff924203 LP |
564 | struct uvc_buffer *buf, __u8 *data, int len) |
565 | { | |
35f02a68 | 566 | struct uvc_video_queue *queue = &stream->queue; |
ff924203 LP |
567 | unsigned int nbytes; |
568 | void *mem; | |
569 | ||
570 | /* Copy video data to the URB buffer. */ | |
571 | mem = queue->mem + buf->buf.m.offset + queue->buf_used; | |
572 | nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used); | |
35f02a68 | 573 | nbytes = min(stream->bulk.max_payload_size - stream->bulk.payload_size, |
ff924203 LP |
574 | nbytes); |
575 | memcpy(data, mem, nbytes); | |
576 | ||
577 | queue->buf_used += nbytes; | |
578 | ||
579 | return nbytes; | |
580 | } | |
581 | ||
c0efd232 LP |
582 | /* ------------------------------------------------------------------------ |
583 | * URB handling | |
584 | */ | |
585 | ||
586 | /* | |
587 | * Completion handler for video URBs. | |
588 | */ | |
35f02a68 LP |
589 | static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream, |
590 | struct uvc_buffer *buf) | |
c0efd232 LP |
591 | { |
592 | u8 *mem; | |
593 | int ret, i; | |
594 | ||
595 | for (i = 0; i < urb->number_of_packets; ++i) { | |
596 | if (urb->iso_frame_desc[i].status < 0) { | |
597 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
598 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
9bde9f26 LP |
599 | /* Mark the buffer as faulty. */ |
600 | if (buf != NULL) | |
601 | buf->error = 1; | |
c0efd232 LP |
602 | continue; |
603 | } | |
604 | ||
605 | /* Decode the payload header. */ | |
606 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
607 | do { | |
35f02a68 | 608 | ret = uvc_video_decode_start(stream, buf, mem, |
c0efd232 LP |
609 | urb->iso_frame_desc[i].actual_length); |
610 | if (ret == -EAGAIN) | |
35f02a68 LP |
611 | buf = uvc_queue_next_buffer(&stream->queue, |
612 | buf); | |
c0efd232 LP |
613 | } while (ret == -EAGAIN); |
614 | ||
615 | if (ret < 0) | |
616 | continue; | |
617 | ||
618 | /* Decode the payload data. */ | |
35f02a68 | 619 | uvc_video_decode_data(stream, buf, mem + ret, |
c0efd232 LP |
620 | urb->iso_frame_desc[i].actual_length - ret); |
621 | ||
622 | /* Process the header again. */ | |
35f02a68 | 623 | uvc_video_decode_end(stream, buf, mem, |
08ebd003 | 624 | urb->iso_frame_desc[i].actual_length); |
c0efd232 | 625 | |
9bde9f26 LP |
626 | if (buf->state == UVC_BUF_STATE_READY) { |
627 | if (buf->buf.length != buf->buf.bytesused && | |
628 | !(stream->cur_format->flags & | |
629 | UVC_FMT_FLAG_COMPRESSED)) | |
630 | buf->error = 1; | |
631 | ||
35f02a68 | 632 | buf = uvc_queue_next_buffer(&stream->queue, buf); |
9bde9f26 | 633 | } |
c0efd232 LP |
634 | } |
635 | } | |
636 | ||
35f02a68 LP |
637 | static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream, |
638 | struct uvc_buffer *buf) | |
c0efd232 LP |
639 | { |
640 | u8 *mem; | |
641 | int len, ret; | |
642 | ||
c90e7779 LP |
643 | if (urb->actual_length == 0) |
644 | return; | |
645 | ||
c0efd232 LP |
646 | mem = urb->transfer_buffer; |
647 | len = urb->actual_length; | |
35f02a68 | 648 | stream->bulk.payload_size += len; |
c0efd232 LP |
649 | |
650 | /* If the URB is the first of its payload, decode and save the | |
651 | * header. | |
652 | */ | |
35f02a68 | 653 | if (stream->bulk.header_size == 0 && !stream->bulk.skip_payload) { |
c0efd232 | 654 | do { |
35f02a68 | 655 | ret = uvc_video_decode_start(stream, buf, mem, len); |
c0efd232 | 656 | if (ret == -EAGAIN) |
35f02a68 LP |
657 | buf = uvc_queue_next_buffer(&stream->queue, |
658 | buf); | |
c0efd232 LP |
659 | } while (ret == -EAGAIN); |
660 | ||
25985edc | 661 | /* If an error occurred skip the rest of the payload. */ |
c0efd232 | 662 | if (ret < 0 || buf == NULL) { |
35f02a68 | 663 | stream->bulk.skip_payload = 1; |
f8dd4af6 | 664 | } else { |
35f02a68 LP |
665 | memcpy(stream->bulk.header, mem, ret); |
666 | stream->bulk.header_size = ret; | |
c0efd232 | 667 | |
f8dd4af6 LP |
668 | mem += ret; |
669 | len -= ret; | |
670 | } | |
c0efd232 LP |
671 | } |
672 | ||
673 | /* The buffer queue might have been cancelled while a bulk transfer | |
674 | * was in progress, so we can reach here with buf equal to NULL. Make | |
675 | * sure buf is never dereferenced if NULL. | |
676 | */ | |
677 | ||
678 | /* Process video data. */ | |
35f02a68 LP |
679 | if (!stream->bulk.skip_payload && buf != NULL) |
680 | uvc_video_decode_data(stream, buf, mem, len); | |
c0efd232 LP |
681 | |
682 | /* Detect the payload end by a URB smaller than the maximum size (or | |
683 | * a payload size equal to the maximum) and process the header again. | |
684 | */ | |
685 | if (urb->actual_length < urb->transfer_buffer_length || | |
35f02a68 LP |
686 | stream->bulk.payload_size >= stream->bulk.max_payload_size) { |
687 | if (!stream->bulk.skip_payload && buf != NULL) { | |
688 | uvc_video_decode_end(stream, buf, stream->bulk.header, | |
689 | stream->bulk.payload_size); | |
d7c0d439 | 690 | if (buf->state == UVC_BUF_STATE_READY) |
35f02a68 LP |
691 | buf = uvc_queue_next_buffer(&stream->queue, |
692 | buf); | |
c0efd232 LP |
693 | } |
694 | ||
35f02a68 LP |
695 | stream->bulk.header_size = 0; |
696 | stream->bulk.skip_payload = 0; | |
697 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
698 | } |
699 | } | |
700 | ||
35f02a68 LP |
701 | static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream, |
702 | struct uvc_buffer *buf) | |
ff924203 LP |
703 | { |
704 | u8 *mem = urb->transfer_buffer; | |
35f02a68 | 705 | int len = stream->urb_size, ret; |
ff924203 LP |
706 | |
707 | if (buf == NULL) { | |
708 | urb->transfer_buffer_length = 0; | |
709 | return; | |
710 | } | |
711 | ||
712 | /* If the URB is the first of its payload, add the header. */ | |
35f02a68 LP |
713 | if (stream->bulk.header_size == 0) { |
714 | ret = uvc_video_encode_header(stream, buf, mem, len); | |
715 | stream->bulk.header_size = ret; | |
716 | stream->bulk.payload_size += ret; | |
ff924203 LP |
717 | mem += ret; |
718 | len -= ret; | |
719 | } | |
720 | ||
721 | /* Process video data. */ | |
35f02a68 | 722 | ret = uvc_video_encode_data(stream, buf, mem, len); |
ff924203 | 723 | |
35f02a68 | 724 | stream->bulk.payload_size += ret; |
ff924203 LP |
725 | len -= ret; |
726 | ||
35f02a68 LP |
727 | if (buf->buf.bytesused == stream->queue.buf_used || |
728 | stream->bulk.payload_size == stream->bulk.max_payload_size) { | |
729 | if (buf->buf.bytesused == stream->queue.buf_used) { | |
730 | stream->queue.buf_used = 0; | |
d7c0d439 | 731 | buf->state = UVC_BUF_STATE_READY; |
650b95fe | 732 | buf->buf.sequence = ++stream->sequence; |
35f02a68 LP |
733 | uvc_queue_next_buffer(&stream->queue, buf); |
734 | stream->last_fid ^= UVC_STREAM_FID; | |
ff924203 LP |
735 | } |
736 | ||
35f02a68 LP |
737 | stream->bulk.header_size = 0; |
738 | stream->bulk.payload_size = 0; | |
ff924203 LP |
739 | } |
740 | ||
35f02a68 | 741 | urb->transfer_buffer_length = stream->urb_size - len; |
ff924203 LP |
742 | } |
743 | ||
c0efd232 LP |
744 | static void uvc_video_complete(struct urb *urb) |
745 | { | |
35f02a68 LP |
746 | struct uvc_streaming *stream = urb->context; |
747 | struct uvc_video_queue *queue = &stream->queue; | |
c0efd232 LP |
748 | struct uvc_buffer *buf = NULL; |
749 | unsigned long flags; | |
750 | int ret; | |
751 | ||
752 | switch (urb->status) { | |
753 | case 0: | |
754 | break; | |
755 | ||
756 | default: | |
757 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
758 | "completion handler.\n", urb->status); | |
759 | ||
760 | case -ENOENT: /* usb_kill_urb() called. */ | |
35f02a68 | 761 | if (stream->frozen) |
c0efd232 LP |
762 | return; |
763 | ||
764 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
765 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
766 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
767 | return; | |
768 | } | |
769 | ||
770 | spin_lock_irqsave(&queue->irqlock, flags); | |
771 | if (!list_empty(&queue->irqqueue)) | |
772 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
773 | queue); | |
774 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
775 | ||
35f02a68 | 776 | stream->decode(urb, stream, buf); |
c0efd232 LP |
777 | |
778 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
779 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
780 | ret); | |
781 | } | |
782 | } | |
783 | ||
e01117c8 LP |
784 | /* |
785 | * Free transfer buffers. | |
786 | */ | |
35f02a68 | 787 | static void uvc_free_urb_buffers(struct uvc_streaming *stream) |
e01117c8 LP |
788 | { |
789 | unsigned int i; | |
790 | ||
791 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 | 792 | if (stream->urb_buffer[i]) { |
997ea58e | 793 | usb_free_coherent(stream->dev->udev, stream->urb_size, |
35f02a68 LP |
794 | stream->urb_buffer[i], stream->urb_dma[i]); |
795 | stream->urb_buffer[i] = NULL; | |
e01117c8 LP |
796 | } |
797 | } | |
798 | ||
35f02a68 | 799 | stream->urb_size = 0; |
e01117c8 LP |
800 | } |
801 | ||
802 | /* | |
803 | * Allocate transfer buffers. This function can be called with buffers | |
804 | * already allocated when resuming from suspend, in which case it will | |
805 | * return without touching the buffers. | |
806 | * | |
efdc8a95 LP |
807 | * Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the |
808 | * system is too low on memory try successively smaller numbers of packets | |
809 | * until allocation succeeds. | |
810 | * | |
811 | * Return the number of allocated packets on success or 0 when out of memory. | |
e01117c8 | 812 | */ |
35f02a68 | 813 | static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, |
efdc8a95 | 814 | unsigned int size, unsigned int psize, gfp_t gfp_flags) |
e01117c8 | 815 | { |
efdc8a95 | 816 | unsigned int npackets; |
e01117c8 LP |
817 | unsigned int i; |
818 | ||
819 | /* Buffers are already allocated, bail out. */ | |
35f02a68 LP |
820 | if (stream->urb_size) |
821 | return stream->urb_size / psize; | |
e01117c8 | 822 | |
efdc8a95 | 823 | /* Compute the number of packets. Bulk endpoints might transfer UVC |
25985edc | 824 | * payloads across multiple URBs. |
efdc8a95 LP |
825 | */ |
826 | npackets = DIV_ROUND_UP(size, psize); | |
827 | if (npackets > UVC_MAX_PACKETS) | |
828 | npackets = UVC_MAX_PACKETS; | |
829 | ||
830 | /* Retry allocations until one succeed. */ | |
831 | for (; npackets > 1; npackets /= 2) { | |
832 | for (i = 0; i < UVC_URBS; ++i) { | |
fd1b6bbb | 833 | stream->urb_size = psize * npackets; |
997ea58e | 834 | stream->urb_buffer[i] = usb_alloc_coherent( |
fd1b6bbb | 835 | stream->dev->udev, stream->urb_size, |
35f02a68 LP |
836 | gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]); |
837 | if (!stream->urb_buffer[i]) { | |
838 | uvc_free_urb_buffers(stream); | |
efdc8a95 LP |
839 | break; |
840 | } | |
841 | } | |
842 | ||
843 | if (i == UVC_URBS) { | |
663a4192 LP |
844 | uvc_trace(UVC_TRACE_VIDEO, "Allocated %u URB buffers " |
845 | "of %ux%u bytes each.\n", UVC_URBS, npackets, | |
846 | psize); | |
efdc8a95 | 847 | return npackets; |
e01117c8 LP |
848 | } |
849 | } | |
850 | ||
663a4192 LP |
851 | uvc_trace(UVC_TRACE_VIDEO, "Failed to allocate URB buffers (%u bytes " |
852 | "per packet).\n", psize); | |
e01117c8 LP |
853 | return 0; |
854 | } | |
855 | ||
c0efd232 LP |
856 | /* |
857 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
858 | */ | |
35f02a68 | 859 | static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) |
c0efd232 LP |
860 | { |
861 | struct urb *urb; | |
862 | unsigned int i; | |
863 | ||
864 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
865 | urb = stream->urb[i]; |
866 | if (urb == NULL) | |
c0efd232 LP |
867 | continue; |
868 | ||
869 | usb_kill_urb(urb); | |
c0efd232 | 870 | usb_free_urb(urb); |
35f02a68 | 871 | stream->urb[i] = NULL; |
c0efd232 | 872 | } |
e01117c8 LP |
873 | |
874 | if (free_buffers) | |
35f02a68 | 875 | uvc_free_urb_buffers(stream); |
c0efd232 LP |
876 | } |
877 | ||
878 | /* | |
879 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
880 | * is given by the endpoint. | |
881 | */ | |
35f02a68 | 882 | static int uvc_init_video_isoc(struct uvc_streaming *stream, |
29135878 | 883 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
884 | { |
885 | struct urb *urb; | |
886 | unsigned int npackets, i, j; | |
efdc8a95 LP |
887 | u16 psize; |
888 | u32 size; | |
c0efd232 | 889 | |
c0efd232 LP |
890 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
891 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
35f02a68 | 892 | size = stream->ctrl.dwMaxVideoFrameSize; |
c0efd232 | 893 | |
35f02a68 | 894 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 LP |
895 | if (npackets == 0) |
896 | return -ENOMEM; | |
c0efd232 LP |
897 | |
898 | size = npackets * psize; | |
899 | ||
900 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 901 | urb = usb_alloc_urb(npackets, gfp_flags); |
c0efd232 | 902 | if (urb == NULL) { |
35f02a68 | 903 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
904 | return -ENOMEM; |
905 | } | |
906 | ||
35f02a68 LP |
907 | urb->dev = stream->dev->udev; |
908 | urb->context = stream; | |
909 | urb->pipe = usb_rcvisocpipe(stream->dev->udev, | |
c0efd232 LP |
910 | ep->desc.bEndpointAddress); |
911 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
912 | urb->interval = ep->desc.bInterval; | |
35f02a68 LP |
913 | urb->transfer_buffer = stream->urb_buffer[i]; |
914 | urb->transfer_dma = stream->urb_dma[i]; | |
c0efd232 LP |
915 | urb->complete = uvc_video_complete; |
916 | urb->number_of_packets = npackets; | |
917 | urb->transfer_buffer_length = size; | |
918 | ||
919 | for (j = 0; j < npackets; ++j) { | |
920 | urb->iso_frame_desc[j].offset = j * psize; | |
921 | urb->iso_frame_desc[j].length = psize; | |
922 | } | |
923 | ||
35f02a68 | 924 | stream->urb[i] = urb; |
c0efd232 LP |
925 | } |
926 | ||
927 | return 0; | |
928 | } | |
929 | ||
930 | /* | |
931 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
932 | * given by the endpoint. | |
933 | */ | |
35f02a68 | 934 | static int uvc_init_video_bulk(struct uvc_streaming *stream, |
29135878 | 935 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
936 | { |
937 | struct urb *urb; | |
efdc8a95 LP |
938 | unsigned int npackets, pipe, i; |
939 | u16 psize; | |
940 | u32 size; | |
941 | ||
c0efd232 | 942 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; |
35f02a68 LP |
943 | size = stream->ctrl.dwMaxPayloadTransferSize; |
944 | stream->bulk.max_payload_size = size; | |
c0efd232 | 945 | |
35f02a68 | 946 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 | 947 | if (npackets == 0) |
e01117c8 LP |
948 | return -ENOMEM; |
949 | ||
efdc8a95 LP |
950 | size = npackets * psize; |
951 | ||
ff924203 | 952 | if (usb_endpoint_dir_in(&ep->desc)) |
35f02a68 | 953 | pipe = usb_rcvbulkpipe(stream->dev->udev, |
ff924203 LP |
954 | ep->desc.bEndpointAddress); |
955 | else | |
35f02a68 | 956 | pipe = usb_sndbulkpipe(stream->dev->udev, |
ff924203 LP |
957 | ep->desc.bEndpointAddress); |
958 | ||
35f02a68 | 959 | if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) |
ff924203 | 960 | size = 0; |
c0efd232 LP |
961 | |
962 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 963 | urb = usb_alloc_urb(0, gfp_flags); |
c0efd232 | 964 | if (urb == NULL) { |
35f02a68 | 965 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
966 | return -ENOMEM; |
967 | } | |
968 | ||
35f02a68 LP |
969 | usb_fill_bulk_urb(urb, stream->dev->udev, pipe, |
970 | stream->urb_buffer[i], size, uvc_video_complete, | |
971 | stream); | |
c0efd232 | 972 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
35f02a68 | 973 | urb->transfer_dma = stream->urb_dma[i]; |
c0efd232 | 974 | |
35f02a68 | 975 | stream->urb[i] = urb; |
c0efd232 LP |
976 | } |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
983 | */ | |
35f02a68 | 984 | static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags) |
c0efd232 | 985 | { |
35f02a68 | 986 | struct usb_interface *intf = stream->intf; |
2c4d9de8 LP |
987 | struct usb_host_endpoint *ep; |
988 | unsigned int i; | |
c0efd232 LP |
989 | int ret; |
990 | ||
650b95fe | 991 | stream->sequence = -1; |
35f02a68 LP |
992 | stream->last_fid = -1; |
993 | stream->bulk.header_size = 0; | |
994 | stream->bulk.skip_payload = 0; | |
995 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
996 | |
997 | if (intf->num_altsetting > 1) { | |
2c4d9de8 LP |
998 | struct usb_host_endpoint *best_ep = NULL; |
999 | unsigned int best_psize = 3 * 1024; | |
1000 | unsigned int bandwidth; | |
1001 | unsigned int uninitialized_var(altsetting); | |
1002 | int intfnum = stream->intfnum; | |
1003 | ||
c0efd232 | 1004 | /* Isochronous endpoint, select the alternate setting. */ |
35f02a68 | 1005 | bandwidth = stream->ctrl.dwMaxPayloadTransferSize; |
c0efd232 LP |
1006 | |
1007 | if (bandwidth == 0) { | |
663a4192 LP |
1008 | uvc_trace(UVC_TRACE_VIDEO, "Device requested null " |
1009 | "bandwidth, defaulting to lowest.\n"); | |
c0efd232 | 1010 | bandwidth = 1; |
663a4192 LP |
1011 | } else { |
1012 | uvc_trace(UVC_TRACE_VIDEO, "Device requested %u " | |
1013 | "B/frame bandwidth.\n", bandwidth); | |
c0efd232 LP |
1014 | } |
1015 | ||
1016 | for (i = 0; i < intf->num_altsetting; ++i) { | |
2c4d9de8 LP |
1017 | struct usb_host_interface *alts; |
1018 | unsigned int psize; | |
1019 | ||
c0efd232 LP |
1020 | alts = &intf->altsetting[i]; |
1021 | ep = uvc_find_endpoint(alts, | |
35f02a68 | 1022 | stream->header.bEndpointAddress); |
c0efd232 LP |
1023 | if (ep == NULL) |
1024 | continue; | |
1025 | ||
1026 | /* Check if the bandwidth is high enough. */ | |
1027 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
1028 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
2c4d9de8 LP |
1029 | if (psize >= bandwidth && psize <= best_psize) { |
1030 | altsetting = i; | |
1031 | best_psize = psize; | |
1032 | best_ep = ep; | |
1033 | } | |
c0efd232 LP |
1034 | } |
1035 | ||
2c4d9de8 | 1036 | if (best_ep == NULL) { |
663a4192 LP |
1037 | uvc_trace(UVC_TRACE_VIDEO, "No fast enough alt setting " |
1038 | "for requested bandwidth.\n"); | |
c0efd232 | 1039 | return -EIO; |
663a4192 | 1040 | } |
c0efd232 | 1041 | |
2c4d9de8 LP |
1042 | uvc_trace(UVC_TRACE_VIDEO, "Selecting alternate setting %u " |
1043 | "(%u B/frame bandwidth).\n", altsetting, best_psize); | |
1044 | ||
1045 | ret = usb_set_interface(stream->dev->udev, intfnum, altsetting); | |
35f02a68 | 1046 | if (ret < 0) |
c0efd232 LP |
1047 | return ret; |
1048 | ||
2c4d9de8 | 1049 | ret = uvc_init_video_isoc(stream, best_ep, gfp_flags); |
c0efd232 LP |
1050 | } else { |
1051 | /* Bulk endpoint, proceed to URB initialization. */ | |
1052 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
35f02a68 | 1053 | stream->header.bEndpointAddress); |
c0efd232 LP |
1054 | if (ep == NULL) |
1055 | return -EIO; | |
1056 | ||
35f02a68 | 1057 | ret = uvc_init_video_bulk(stream, ep, gfp_flags); |
c0efd232 LP |
1058 | } |
1059 | ||
1060 | if (ret < 0) | |
1061 | return ret; | |
1062 | ||
1063 | /* Submit the URBs. */ | |
1064 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
1065 | ret = usb_submit_urb(stream->urb[i], gfp_flags); |
1066 | if (ret < 0) { | |
c0efd232 LP |
1067 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
1068 | "(%d).\n", i, ret); | |
35f02a68 | 1069 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
1070 | return ret; |
1071 | } | |
1072 | } | |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | /* -------------------------------------------------------------------------- | |
1078 | * Suspend/resume | |
1079 | */ | |
1080 | ||
1081 | /* | |
1082 | * Stop streaming without disabling the video queue. | |
1083 | * | |
1084 | * To let userspace applications resume without trouble, we must not touch the | |
1085 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
1086 | * completion handler won't try to cancel the queue when we kill the URBs. | |
1087 | */ | |
35f02a68 | 1088 | int uvc_video_suspend(struct uvc_streaming *stream) |
c0efd232 | 1089 | { |
35f02a68 | 1090 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1091 | return 0; |
1092 | ||
35f02a68 LP |
1093 | stream->frozen = 1; |
1094 | uvc_uninit_video(stream, 0); | |
1095 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
c0efd232 LP |
1096 | return 0; |
1097 | } | |
1098 | ||
1099 | /* | |
2c2d264b | 1100 | * Reconfigure the video interface and restart streaming if it was enabled |
c0efd232 LP |
1101 | * before suspend. |
1102 | * | |
1103 | * If an error occurs, disable the video queue. This will wake all pending | |
1104 | * buffers, making sure userspace applications are notified of the problem | |
1105 | * instead of waiting forever. | |
1106 | */ | |
35f02a68 | 1107 | int uvc_video_resume(struct uvc_streaming *stream) |
c0efd232 LP |
1108 | { |
1109 | int ret; | |
1110 | ||
35f02a68 | 1111 | stream->frozen = 0; |
c0efd232 | 1112 | |
35f02a68 LP |
1113 | ret = uvc_commit_video(stream, &stream->ctrl); |
1114 | if (ret < 0) { | |
1115 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1116 | return ret; |
1117 | } | |
1118 | ||
35f02a68 | 1119 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1120 | return 0; |
1121 | ||
35f02a68 LP |
1122 | ret = uvc_init_video(stream, GFP_NOIO); |
1123 | if (ret < 0) | |
1124 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1125 | |
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | /* ------------------------------------------------------------------------ | |
1130 | * Video device | |
1131 | */ | |
1132 | ||
1133 | /* | |
2c2d264b LP |
1134 | * Initialize the UVC video device by switching to alternate setting 0 and |
1135 | * retrieve the default format. | |
c0efd232 LP |
1136 | * |
1137 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
1138 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
1139 | * violation, so try to silently fix the values if possible. | |
1140 | * | |
1141 | * This function is called before registering the device with V4L. | |
1142 | */ | |
35f02a68 | 1143 | int uvc_video_init(struct uvc_streaming *stream) |
c0efd232 | 1144 | { |
35f02a68 | 1145 | struct uvc_streaming_control *probe = &stream->ctrl; |
c0efd232 LP |
1146 | struct uvc_format *format = NULL; |
1147 | struct uvc_frame *frame = NULL; | |
1148 | unsigned int i; | |
1149 | int ret; | |
1150 | ||
35f02a68 | 1151 | if (stream->nformats == 0) { |
c0efd232 LP |
1152 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); |
1153 | return -EINVAL; | |
1154 | } | |
1155 | ||
35f02a68 LP |
1156 | atomic_set(&stream->active, 0); |
1157 | ||
1158 | /* Initialize the video buffers queue. */ | |
9bde9f26 | 1159 | uvc_queue_init(&stream->queue, stream->type, !uvc_no_drop_param); |
35f02a68 | 1160 | |
c0efd232 LP |
1161 | /* Alternate setting 0 should be the default, yet the XBox Live Vision |
1162 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
1163 | * they don't receive a SET_INTERFACE request before any other video | |
1164 | * control request. | |
1165 | */ | |
35f02a68 | 1166 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); |
c0efd232 | 1167 | |
72362422 LP |
1168 | /* Set the streaming probe control with default streaming parameters |
1169 | * retrieved from the device. Webcams that don't suport GET_DEF | |
1170 | * requests on the probe control will just keep their current streaming | |
1171 | * parameters. | |
c0efd232 | 1172 | */ |
35f02a68 LP |
1173 | if (uvc_get_video_ctrl(stream, probe, 1, UVC_GET_DEF) == 0) |
1174 | uvc_set_video_ctrl(stream, probe, 1); | |
72362422 LP |
1175 | |
1176 | /* Initialize the streaming parameters with the probe control current | |
1177 | * value. This makes sure SET_CUR requests on the streaming commit | |
1178 | * control will always use values retrieved from a successful GET_CUR | |
1179 | * request on the probe control, as required by the UVC specification. | |
1180 | */ | |
35f02a68 | 1181 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 1182 | if (ret < 0) |
c0efd232 LP |
1183 | return ret; |
1184 | ||
1185 | /* Check if the default format descriptor exists. Use the first | |
1186 | * available format otherwise. | |
1187 | */ | |
35f02a68 LP |
1188 | for (i = stream->nformats; i > 0; --i) { |
1189 | format = &stream->format[i-1]; | |
c0efd232 LP |
1190 | if (format->index == probe->bFormatIndex) |
1191 | break; | |
1192 | } | |
1193 | ||
1194 | if (format->nframes == 0) { | |
1195 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
1196 | "default format.\n"); | |
1197 | return -EINVAL; | |
1198 | } | |
1199 | ||
1200 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
1201 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
1202 | * descriptor with bFrameIndex set to zero. If the default frame | |
078f8947 | 1203 | * descriptor is not found, use the first available frame. |
c0efd232 LP |
1204 | */ |
1205 | for (i = format->nframes; i > 0; --i) { | |
1206 | frame = &format->frame[i-1]; | |
1207 | if (frame->bFrameIndex == probe->bFrameIndex) | |
1208 | break; | |
1209 | } | |
1210 | ||
c0efd232 LP |
1211 | probe->bFormatIndex = format->index; |
1212 | probe->bFrameIndex = frame->bFrameIndex; | |
c0efd232 | 1213 | |
35f02a68 LP |
1214 | stream->cur_format = format; |
1215 | stream->cur_frame = frame; | |
c0efd232 LP |
1216 | |
1217 | /* Select the video decoding function */ | |
35f02a68 LP |
1218 | if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { |
1219 | if (stream->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
1220 | stream->decode = uvc_video_decode_isight; | |
1221 | else if (stream->intf->num_altsetting > 1) | |
1222 | stream->decode = uvc_video_decode_isoc; | |
ff924203 | 1223 | else |
35f02a68 | 1224 | stream->decode = uvc_video_decode_bulk; |
ff924203 | 1225 | } else { |
35f02a68 LP |
1226 | if (stream->intf->num_altsetting == 1) |
1227 | stream->decode = uvc_video_encode_bulk; | |
ff924203 LP |
1228 | else { |
1229 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | |
1230 | "supported for video output devices.\n"); | |
1231 | return -EINVAL; | |
1232 | } | |
1233 | } | |
c0efd232 LP |
1234 | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Enable or disable the video stream. | |
1240 | */ | |
35f02a68 | 1241 | int uvc_video_enable(struct uvc_streaming *stream, int enable) |
c0efd232 LP |
1242 | { |
1243 | int ret; | |
1244 | ||
1245 | if (!enable) { | |
35f02a68 LP |
1246 | uvc_uninit_video(stream, 1); |
1247 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1248 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1249 | return 0; |
1250 | } | |
1251 | ||
35f02a68 LP |
1252 | ret = uvc_queue_enable(&stream->queue, 1); |
1253 | if (ret < 0) | |
c0efd232 LP |
1254 | return ret; |
1255 | ||
23867b25 | 1256 | /* Commit the streaming parameters. */ |
35f02a68 LP |
1257 | ret = uvc_commit_video(stream, &stream->ctrl); |
1258 | if (ret < 0) | |
23867b25 LP |
1259 | return ret; |
1260 | ||
35f02a68 | 1261 | return uvc_init_video(stream, GFP_KERNEL); |
c0efd232 | 1262 | } |
f87086e3 | 1263 |