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Commit | Line | Data |
---|---|---|
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 | ||
0c6a3b26 LP |
354 | static int uvc_commit_video(struct uvc_streaming *stream, |
355 | struct uvc_streaming_control *probe) | |
44f0079e | 356 | { |
35f02a68 | 357 | return uvc_set_video_ctrl(stream, probe, 0); |
44f0079e LP |
358 | } |
359 | ||
7bc5edb0 OR |
360 | /* ------------------------------------------------------------------------ |
361 | * Stream statistics | |
362 | */ | |
363 | ||
364 | static void uvc_video_stats_decode(struct uvc_streaming *stream, | |
365 | const __u8 *data, int len) | |
366 | { | |
367 | unsigned int header_size; | |
25738cbd LP |
368 | bool has_pts = false; |
369 | bool has_scr = false; | |
370 | u16 uninitialized_var(scr_sof); | |
371 | u32 uninitialized_var(scr_stc); | |
372 | u32 uninitialized_var(pts); | |
7bc5edb0 OR |
373 | |
374 | if (stream->stats.stream.nb_frames == 0 && | |
375 | stream->stats.frame.nb_packets == 0) | |
376 | ktime_get_ts(&stream->stats.stream.start_ts); | |
377 | ||
378 | switch (data[1] & (UVC_STREAM_PTS | UVC_STREAM_SCR)) { | |
379 | case UVC_STREAM_PTS | UVC_STREAM_SCR: | |
380 | header_size = 12; | |
25738cbd LP |
381 | has_pts = true; |
382 | has_scr = true; | |
7bc5edb0 OR |
383 | break; |
384 | case UVC_STREAM_PTS: | |
385 | header_size = 6; | |
25738cbd | 386 | has_pts = true; |
7bc5edb0 OR |
387 | break; |
388 | case UVC_STREAM_SCR: | |
389 | header_size = 8; | |
25738cbd | 390 | has_scr = true; |
7bc5edb0 OR |
391 | break; |
392 | default: | |
393 | header_size = 2; | |
394 | break; | |
395 | } | |
396 | ||
397 | /* Check for invalid headers. */ | |
398 | if (len < header_size || data[0] < header_size) { | |
399 | stream->stats.frame.nb_invalid++; | |
400 | return; | |
401 | } | |
402 | ||
25738cbd LP |
403 | /* Extract the timestamps. */ |
404 | if (has_pts) | |
405 | pts = get_unaligned_le32(&data[2]); | |
406 | ||
407 | if (has_scr) { | |
408 | scr_stc = get_unaligned_le32(&data[header_size - 6]); | |
409 | scr_sof = get_unaligned_le16(&data[header_size - 2]); | |
410 | } | |
411 | ||
412 | /* Is PTS constant through the whole frame ? */ | |
413 | if (has_pts && stream->stats.frame.nb_pts) { | |
414 | if (stream->stats.frame.pts != pts) { | |
415 | stream->stats.frame.nb_pts_diffs++; | |
416 | stream->stats.frame.last_pts_diff = | |
417 | stream->stats.frame.nb_packets; | |
418 | } | |
419 | } | |
420 | ||
421 | if (has_pts) { | |
422 | stream->stats.frame.nb_pts++; | |
423 | stream->stats.frame.pts = pts; | |
424 | } | |
425 | ||
426 | /* Do all frames have a PTS in their first non-empty packet, or before | |
427 | * their first empty packet ? | |
428 | */ | |
429 | if (stream->stats.frame.size == 0) { | |
430 | if (len > header_size) | |
431 | stream->stats.frame.has_initial_pts = has_pts; | |
432 | if (len == header_size && has_pts) | |
433 | stream->stats.frame.has_early_pts = true; | |
434 | } | |
435 | ||
436 | /* Do the SCR.STC and SCR.SOF fields vary through the frame ? */ | |
437 | if (has_scr && stream->stats.frame.nb_scr) { | |
438 | if (stream->stats.frame.scr_stc != scr_stc) | |
439 | stream->stats.frame.nb_scr_diffs++; | |
440 | } | |
441 | ||
442 | if (has_scr) { | |
443 | /* Expand the SOF counter to 32 bits and store its value. */ | |
444 | if (stream->stats.stream.nb_frames > 0 || | |
445 | stream->stats.frame.nb_scr > 0) | |
446 | stream->stats.stream.scr_sof_count += | |
447 | (scr_sof - stream->stats.stream.scr_sof) % 2048; | |
448 | stream->stats.stream.scr_sof = scr_sof; | |
449 | ||
450 | stream->stats.frame.nb_scr++; | |
451 | stream->stats.frame.scr_stc = scr_stc; | |
452 | stream->stats.frame.scr_sof = scr_sof; | |
453 | ||
454 | if (scr_sof < stream->stats.stream.min_sof) | |
455 | stream->stats.stream.min_sof = scr_sof; | |
456 | if (scr_sof > stream->stats.stream.max_sof) | |
457 | stream->stats.stream.max_sof = scr_sof; | |
458 | } | |
459 | ||
7bc5edb0 OR |
460 | /* Record the first non-empty packet number. */ |
461 | if (stream->stats.frame.size == 0 && len > header_size) | |
462 | stream->stats.frame.first_data = stream->stats.frame.nb_packets; | |
463 | ||
464 | /* Update the frame size. */ | |
465 | stream->stats.frame.size += len - header_size; | |
466 | ||
467 | /* Update the packets counters. */ | |
468 | stream->stats.frame.nb_packets++; | |
469 | if (len > header_size) | |
470 | stream->stats.frame.nb_empty++; | |
471 | ||
472 | if (data[1] & UVC_STREAM_ERR) | |
473 | stream->stats.frame.nb_errors++; | |
474 | } | |
475 | ||
476 | static void uvc_video_stats_update(struct uvc_streaming *stream) | |
477 | { | |
478 | struct uvc_stats_frame *frame = &stream->stats.frame; | |
479 | ||
25738cbd LP |
480 | uvc_trace(UVC_TRACE_STATS, "frame %u stats: %u/%u/%u packets, " |
481 | "%u/%u/%u pts (%searly %sinitial), %u/%u scr, " | |
482 | "last pts/stc/sof %u/%u/%u\n", | |
7bc5edb0 | 483 | stream->sequence, frame->first_data, |
25738cbd LP |
484 | frame->nb_packets - frame->nb_empty, frame->nb_packets, |
485 | frame->nb_pts_diffs, frame->last_pts_diff, frame->nb_pts, | |
486 | frame->has_early_pts ? "" : "!", | |
487 | frame->has_initial_pts ? "" : "!", | |
488 | frame->nb_scr_diffs, frame->nb_scr, | |
489 | frame->pts, frame->scr_stc, frame->scr_sof); | |
7bc5edb0 OR |
490 | |
491 | stream->stats.stream.nb_frames++; | |
492 | stream->stats.stream.nb_packets += stream->stats.frame.nb_packets; | |
493 | stream->stats.stream.nb_empty += stream->stats.frame.nb_empty; | |
494 | stream->stats.stream.nb_errors += stream->stats.frame.nb_errors; | |
495 | stream->stats.stream.nb_invalid += stream->stats.frame.nb_invalid; | |
496 | ||
25738cbd LP |
497 | if (frame->has_early_pts) |
498 | stream->stats.stream.nb_pts_early++; | |
499 | if (frame->has_initial_pts) | |
500 | stream->stats.stream.nb_pts_initial++; | |
501 | if (frame->last_pts_diff <= frame->first_data) | |
502 | stream->stats.stream.nb_pts_constant++; | |
503 | if (frame->nb_scr >= frame->nb_packets - frame->nb_empty) | |
504 | stream->stats.stream.nb_scr_count_ok++; | |
505 | if (frame->nb_scr_diffs + 1 == frame->nb_scr) | |
506 | stream->stats.stream.nb_scr_diffs_ok++; | |
507 | ||
7bc5edb0 OR |
508 | memset(&stream->stats.frame, 0, sizeof(stream->stats.frame)); |
509 | } | |
510 | ||
511 | size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf, | |
512 | size_t size) | |
513 | { | |
25738cbd LP |
514 | unsigned int scr_sof_freq; |
515 | unsigned int duration; | |
516 | struct timespec ts; | |
7bc5edb0 OR |
517 | size_t count = 0; |
518 | ||
25738cbd LP |
519 | ts.tv_sec = stream->stats.stream.stop_ts.tv_sec |
520 | - stream->stats.stream.start_ts.tv_sec; | |
521 | ts.tv_nsec = stream->stats.stream.stop_ts.tv_nsec | |
522 | - stream->stats.stream.start_ts.tv_nsec; | |
523 | if (ts.tv_nsec < 0) { | |
524 | ts.tv_sec--; | |
525 | ts.tv_nsec += 1000000000; | |
526 | } | |
527 | ||
528 | /* Compute the SCR.SOF frequency estimate. At the nominal 1kHz SOF | |
529 | * frequency this will not overflow before more than 1h. | |
530 | */ | |
531 | duration = ts.tv_sec * 1000 + ts.tv_nsec / 1000000; | |
532 | if (duration != 0) | |
533 | scr_sof_freq = stream->stats.stream.scr_sof_count * 1000 | |
534 | / duration; | |
535 | else | |
536 | scr_sof_freq = 0; | |
537 | ||
7bc5edb0 OR |
538 | count += scnprintf(buf + count, size - count, |
539 | "frames: %u\npackets: %u\nempty: %u\n" | |
540 | "errors: %u\ninvalid: %u\n", | |
541 | stream->stats.stream.nb_frames, | |
542 | stream->stats.stream.nb_packets, | |
543 | stream->stats.stream.nb_empty, | |
544 | stream->stats.stream.nb_errors, | |
545 | stream->stats.stream.nb_invalid); | |
25738cbd LP |
546 | count += scnprintf(buf + count, size - count, |
547 | "pts: %u early, %u initial, %u ok\n", | |
548 | stream->stats.stream.nb_pts_early, | |
549 | stream->stats.stream.nb_pts_initial, | |
550 | stream->stats.stream.nb_pts_constant); | |
551 | count += scnprintf(buf + count, size - count, | |
552 | "scr: %u count ok, %u diff ok\n", | |
553 | stream->stats.stream.nb_scr_count_ok, | |
554 | stream->stats.stream.nb_scr_diffs_ok); | |
555 | count += scnprintf(buf + count, size - count, | |
556 | "sof: %u <= sof <= %u, freq %u.%03u kHz\n", | |
557 | stream->stats.stream.min_sof, | |
558 | stream->stats.stream.max_sof, | |
559 | scr_sof_freq / 1000, scr_sof_freq % 1000); | |
7bc5edb0 OR |
560 | |
561 | return count; | |
562 | } | |
563 | ||
564 | static void uvc_video_stats_start(struct uvc_streaming *stream) | |
565 | { | |
566 | memset(&stream->stats, 0, sizeof(stream->stats)); | |
25738cbd | 567 | stream->stats.stream.min_sof = 2048; |
7bc5edb0 OR |
568 | } |
569 | ||
570 | static void uvc_video_stats_stop(struct uvc_streaming *stream) | |
571 | { | |
572 | ktime_get_ts(&stream->stats.stream.stop_ts); | |
573 | } | |
574 | ||
c0efd232 LP |
575 | /* ------------------------------------------------------------------------ |
576 | * Video codecs | |
577 | */ | |
578 | ||
c0efd232 LP |
579 | /* Video payload decoding is handled by uvc_video_decode_start(), |
580 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
581 | * | |
582 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
583 | * isochronous payload. It processes header data and returns the header size | |
584 | * in bytes if successful. If an error occurs, it returns a negative error | |
585 | * code. The following error codes have special meanings. | |
586 | * | |
587 | * - EAGAIN informs the caller that the current video buffer should be marked | |
588 | * as done, and that the function should be called again with the same data | |
589 | * and a new video buffer. This is used when end of frame conditions can be | |
590 | * reliably detected at the beginning of the next frame only. | |
591 | * | |
592 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
593 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
594 | * made until the next payload. -ENODATA can be used to drop the current | |
595 | * payload if no other error code is appropriate. | |
596 | * | |
597 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
598 | * data to the video buffer. | |
599 | * | |
600 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
601 | * isochronous payload. It performs any additional header data processing and | |
25985edc | 602 | * returns 0 or a negative error code if an error occurred. As header data have |
c0efd232 LP |
603 | * already been processed by uvc_video_decode_start, this functions isn't |
604 | * required to perform sanity checks a second time. | |
605 | * | |
25985edc | 606 | * For isochronous transfers where a payload is always transferred in a single |
c0efd232 LP |
607 | * URB, the three functions will be called in a row. |
608 | * | |
609 | * To let the decoder process header data and update its internal state even | |
610 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
611 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
612 | * uvc_video_decode_end will never be called with a NULL buffer. | |
613 | */ | |
35f02a68 | 614 | static int uvc_video_decode_start(struct uvc_streaming *stream, |
c0efd232 LP |
615 | struct uvc_buffer *buf, const __u8 *data, int len) |
616 | { | |
617 | __u8 fid; | |
618 | ||
619 | /* Sanity checks: | |
620 | * - packet must be at least 2 bytes long | |
621 | * - bHeaderLength value must be at least 2 bytes (see above) | |
622 | * - bHeaderLength value can't be larger than the packet size. | |
623 | */ | |
7bc5edb0 OR |
624 | if (len < 2 || data[0] < 2 || data[0] > len) { |
625 | stream->stats.frame.nb_invalid++; | |
c0efd232 | 626 | return -EINVAL; |
7bc5edb0 | 627 | } |
c0efd232 | 628 | |
c0efd232 LP |
629 | fid = data[1] & UVC_STREAM_FID; |
630 | ||
650b95fe LP |
631 | /* Increase the sequence number regardless of any buffer states, so |
632 | * that discontinuous sequence numbers always indicate lost frames. | |
633 | */ | |
7bc5edb0 | 634 | if (stream->last_fid != fid) { |
650b95fe | 635 | stream->sequence++; |
7bc5edb0 OR |
636 | if (stream->sequence) |
637 | uvc_video_stats_update(stream); | |
638 | } | |
639 | ||
640 | uvc_video_stats_decode(stream, data, len); | |
650b95fe | 641 | |
c0efd232 LP |
642 | /* Store the payload FID bit and return immediately when the buffer is |
643 | * NULL. | |
644 | */ | |
645 | if (buf == NULL) { | |
35f02a68 | 646 | stream->last_fid = fid; |
c0efd232 LP |
647 | return -ENODATA; |
648 | } | |
649 | ||
3afedb95 LP |
650 | /* Mark the buffer as bad if the error bit is set. */ |
651 | if (data[1] & UVC_STREAM_ERR) { | |
652 | uvc_trace(UVC_TRACE_FRAME, "Marking buffer as bad (error bit " | |
653 | "set).\n"); | |
654 | buf->error = 1; | |
655 | } | |
656 | ||
c0efd232 LP |
657 | /* Synchronize to the input stream by waiting for the FID bit to be |
658 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
35f02a68 | 659 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
660 | * frame will always be in sync. |
661 | * | |
35f02a68 | 662 | * If the device doesn't toggle the FID bit, invert stream->last_fid |
c0efd232 LP |
663 | * when the EOF bit is set to force synchronisation on the next packet. |
664 | */ | |
665 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
310fe524 LP |
666 | struct timespec ts; |
667 | ||
35f02a68 | 668 | if (fid == stream->last_fid) { |
c0efd232 LP |
669 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " |
670 | "sync).\n"); | |
35f02a68 | 671 | if ((stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && |
c0efd232 | 672 | (data[1] & UVC_STREAM_EOF)) |
35f02a68 | 673 | stream->last_fid ^= UVC_STREAM_FID; |
c0efd232 LP |
674 | return -ENODATA; |
675 | } | |
676 | ||
310fe524 LP |
677 | if (uvc_clock_param == CLOCK_MONOTONIC) |
678 | ktime_get_ts(&ts); | |
679 | else | |
680 | ktime_get_real_ts(&ts); | |
681 | ||
6998b6fb LP |
682 | buf->buf.v4l2_buf.sequence = stream->sequence; |
683 | buf->buf.v4l2_buf.timestamp.tv_sec = ts.tv_sec; | |
684 | buf->buf.v4l2_buf.timestamp.tv_usec = | |
685 | ts.tv_nsec / NSEC_PER_USEC; | |
310fe524 | 686 | |
c0efd232 LP |
687 | /* TODO: Handle PTS and SCR. */ |
688 | buf->state = UVC_BUF_STATE_ACTIVE; | |
689 | } | |
690 | ||
691 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
692 | * End of frame detection is better implemented by checking the EOF | |
693 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
694 | * bit), but some devices don't set the bit at end of frame (and the | |
695 | * last payload can be lost anyway). We thus must check if the FID has | |
696 | * been toggled. | |
697 | * | |
35f02a68 | 698 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
699 | * frame will never trigger an end of frame detection. |
700 | * | |
701 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
702 | * as it doesn't make sense to return an empty buffer. This also | |
2c2d264b | 703 | * avoids detecting end of frame conditions at FID toggling if the |
c0efd232 LP |
704 | * previous payload had the EOF bit set. |
705 | */ | |
3d95e932 | 706 | if (fid != stream->last_fid && buf->bytesused != 0) { |
c0efd232 LP |
707 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " |
708 | "toggled).\n"); | |
d7c0d439 | 709 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
710 | return -EAGAIN; |
711 | } | |
712 | ||
35f02a68 | 713 | stream->last_fid = fid; |
c0efd232 LP |
714 | |
715 | return data[0]; | |
716 | } | |
717 | ||
35f02a68 | 718 | static void uvc_video_decode_data(struct uvc_streaming *stream, |
c0efd232 LP |
719 | struct uvc_buffer *buf, const __u8 *data, int len) |
720 | { | |
c0efd232 LP |
721 | unsigned int maxlen, nbytes; |
722 | void *mem; | |
723 | ||
724 | if (len <= 0) | |
725 | return; | |
726 | ||
727 | /* Copy the video data to the buffer. */ | |
3d95e932 LP |
728 | maxlen = buf->length - buf->bytesused; |
729 | mem = buf->mem + buf->bytesused; | |
c0efd232 LP |
730 | nbytes = min((unsigned int)len, maxlen); |
731 | memcpy(mem, data, nbytes); | |
3d95e932 | 732 | buf->bytesused += nbytes; |
c0efd232 LP |
733 | |
734 | /* Complete the current frame if the buffer size was exceeded. */ | |
735 | if (len > maxlen) { | |
736 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
d7c0d439 | 737 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
738 | } |
739 | } | |
740 | ||
35f02a68 | 741 | static void uvc_video_decode_end(struct uvc_streaming *stream, |
c0efd232 LP |
742 | struct uvc_buffer *buf, const __u8 *data, int len) |
743 | { | |
744 | /* Mark the buffer as done if the EOF marker is set. */ | |
3d95e932 | 745 | if (data[1] & UVC_STREAM_EOF && buf->bytesused != 0) { |
c0efd232 LP |
746 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); |
747 | if (data[0] == len) | |
748 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
d7c0d439 | 749 | buf->state = UVC_BUF_STATE_READY; |
35f02a68 LP |
750 | if (stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) |
751 | stream->last_fid ^= UVC_STREAM_FID; | |
c0efd232 LP |
752 | } |
753 | } | |
754 | ||
2c2d264b LP |
755 | /* Video payload encoding is handled by uvc_video_encode_header() and |
756 | * uvc_video_encode_data(). Only bulk transfers are currently supported. | |
757 | * | |
758 | * uvc_video_encode_header is called at the start of a payload. It adds header | |
759 | * data to the transfer buffer and returns the header size. As the only known | |
760 | * UVC output device transfers a whole frame in a single payload, the EOF bit | |
761 | * is always set in the header. | |
762 | * | |
763 | * uvc_video_encode_data is called for every URB and copies the data from the | |
764 | * video buffer to the transfer buffer. | |
765 | */ | |
35f02a68 | 766 | static int uvc_video_encode_header(struct uvc_streaming *stream, |
ff924203 LP |
767 | struct uvc_buffer *buf, __u8 *data, int len) |
768 | { | |
769 | data[0] = 2; /* Header length */ | |
770 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | |
35f02a68 | 771 | | (stream->last_fid & UVC_STREAM_FID); |
ff924203 LP |
772 | return 2; |
773 | } | |
774 | ||
35f02a68 | 775 | static int uvc_video_encode_data(struct uvc_streaming *stream, |
ff924203 LP |
776 | struct uvc_buffer *buf, __u8 *data, int len) |
777 | { | |
35f02a68 | 778 | struct uvc_video_queue *queue = &stream->queue; |
ff924203 LP |
779 | unsigned int nbytes; |
780 | void *mem; | |
781 | ||
782 | /* Copy video data to the URB buffer. */ | |
3d95e932 LP |
783 | mem = buf->mem + queue->buf_used; |
784 | nbytes = min((unsigned int)len, buf->bytesused - queue->buf_used); | |
35f02a68 | 785 | nbytes = min(stream->bulk.max_payload_size - stream->bulk.payload_size, |
ff924203 LP |
786 | nbytes); |
787 | memcpy(data, mem, nbytes); | |
788 | ||
789 | queue->buf_used += nbytes; | |
790 | ||
791 | return nbytes; | |
792 | } | |
793 | ||
c0efd232 LP |
794 | /* ------------------------------------------------------------------------ |
795 | * URB handling | |
796 | */ | |
797 | ||
798 | /* | |
799 | * Completion handler for video URBs. | |
800 | */ | |
35f02a68 LP |
801 | static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream, |
802 | struct uvc_buffer *buf) | |
c0efd232 LP |
803 | { |
804 | u8 *mem; | |
805 | int ret, i; | |
806 | ||
807 | for (i = 0; i < urb->number_of_packets; ++i) { | |
808 | if (urb->iso_frame_desc[i].status < 0) { | |
809 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
810 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
9bde9f26 LP |
811 | /* Mark the buffer as faulty. */ |
812 | if (buf != NULL) | |
813 | buf->error = 1; | |
c0efd232 LP |
814 | continue; |
815 | } | |
816 | ||
817 | /* Decode the payload header. */ | |
818 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
819 | do { | |
35f02a68 | 820 | ret = uvc_video_decode_start(stream, buf, mem, |
c0efd232 LP |
821 | urb->iso_frame_desc[i].actual_length); |
822 | if (ret == -EAGAIN) | |
35f02a68 LP |
823 | buf = uvc_queue_next_buffer(&stream->queue, |
824 | buf); | |
c0efd232 LP |
825 | } while (ret == -EAGAIN); |
826 | ||
827 | if (ret < 0) | |
828 | continue; | |
829 | ||
830 | /* Decode the payload data. */ | |
35f02a68 | 831 | uvc_video_decode_data(stream, buf, mem + ret, |
c0efd232 LP |
832 | urb->iso_frame_desc[i].actual_length - ret); |
833 | ||
834 | /* Process the header again. */ | |
35f02a68 | 835 | uvc_video_decode_end(stream, buf, mem, |
08ebd003 | 836 | urb->iso_frame_desc[i].actual_length); |
c0efd232 | 837 | |
9bde9f26 | 838 | if (buf->state == UVC_BUF_STATE_READY) { |
3d95e932 | 839 | if (buf->length != buf->bytesused && |
9bde9f26 LP |
840 | !(stream->cur_format->flags & |
841 | UVC_FMT_FLAG_COMPRESSED)) | |
842 | buf->error = 1; | |
843 | ||
35f02a68 | 844 | buf = uvc_queue_next_buffer(&stream->queue, buf); |
9bde9f26 | 845 | } |
c0efd232 LP |
846 | } |
847 | } | |
848 | ||
35f02a68 LP |
849 | static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream, |
850 | struct uvc_buffer *buf) | |
c0efd232 LP |
851 | { |
852 | u8 *mem; | |
853 | int len, ret; | |
854 | ||
c90e7779 LP |
855 | if (urb->actual_length == 0) |
856 | return; | |
857 | ||
c0efd232 LP |
858 | mem = urb->transfer_buffer; |
859 | len = urb->actual_length; | |
35f02a68 | 860 | stream->bulk.payload_size += len; |
c0efd232 LP |
861 | |
862 | /* If the URB is the first of its payload, decode and save the | |
863 | * header. | |
864 | */ | |
35f02a68 | 865 | if (stream->bulk.header_size == 0 && !stream->bulk.skip_payload) { |
c0efd232 | 866 | do { |
35f02a68 | 867 | ret = uvc_video_decode_start(stream, buf, mem, len); |
c0efd232 | 868 | if (ret == -EAGAIN) |
35f02a68 LP |
869 | buf = uvc_queue_next_buffer(&stream->queue, |
870 | buf); | |
c0efd232 LP |
871 | } while (ret == -EAGAIN); |
872 | ||
25985edc | 873 | /* If an error occurred skip the rest of the payload. */ |
c0efd232 | 874 | if (ret < 0 || buf == NULL) { |
35f02a68 | 875 | stream->bulk.skip_payload = 1; |
f8dd4af6 | 876 | } else { |
35f02a68 LP |
877 | memcpy(stream->bulk.header, mem, ret); |
878 | stream->bulk.header_size = ret; | |
c0efd232 | 879 | |
f8dd4af6 LP |
880 | mem += ret; |
881 | len -= ret; | |
882 | } | |
c0efd232 LP |
883 | } |
884 | ||
885 | /* The buffer queue might have been cancelled while a bulk transfer | |
886 | * was in progress, so we can reach here with buf equal to NULL. Make | |
887 | * sure buf is never dereferenced if NULL. | |
888 | */ | |
889 | ||
890 | /* Process video data. */ | |
35f02a68 LP |
891 | if (!stream->bulk.skip_payload && buf != NULL) |
892 | uvc_video_decode_data(stream, buf, mem, len); | |
c0efd232 LP |
893 | |
894 | /* Detect the payload end by a URB smaller than the maximum size (or | |
895 | * a payload size equal to the maximum) and process the header again. | |
896 | */ | |
897 | if (urb->actual_length < urb->transfer_buffer_length || | |
35f02a68 LP |
898 | stream->bulk.payload_size >= stream->bulk.max_payload_size) { |
899 | if (!stream->bulk.skip_payload && buf != NULL) { | |
900 | uvc_video_decode_end(stream, buf, stream->bulk.header, | |
901 | stream->bulk.payload_size); | |
d7c0d439 | 902 | if (buf->state == UVC_BUF_STATE_READY) |
35f02a68 LP |
903 | buf = uvc_queue_next_buffer(&stream->queue, |
904 | buf); | |
c0efd232 LP |
905 | } |
906 | ||
35f02a68 LP |
907 | stream->bulk.header_size = 0; |
908 | stream->bulk.skip_payload = 0; | |
909 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
910 | } |
911 | } | |
912 | ||
35f02a68 LP |
913 | static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream, |
914 | struct uvc_buffer *buf) | |
ff924203 LP |
915 | { |
916 | u8 *mem = urb->transfer_buffer; | |
35f02a68 | 917 | int len = stream->urb_size, ret; |
ff924203 LP |
918 | |
919 | if (buf == NULL) { | |
920 | urb->transfer_buffer_length = 0; | |
921 | return; | |
922 | } | |
923 | ||
924 | /* If the URB is the first of its payload, add the header. */ | |
35f02a68 LP |
925 | if (stream->bulk.header_size == 0) { |
926 | ret = uvc_video_encode_header(stream, buf, mem, len); | |
927 | stream->bulk.header_size = ret; | |
928 | stream->bulk.payload_size += ret; | |
ff924203 LP |
929 | mem += ret; |
930 | len -= ret; | |
931 | } | |
932 | ||
933 | /* Process video data. */ | |
35f02a68 | 934 | ret = uvc_video_encode_data(stream, buf, mem, len); |
ff924203 | 935 | |
35f02a68 | 936 | stream->bulk.payload_size += ret; |
ff924203 LP |
937 | len -= ret; |
938 | ||
3d95e932 | 939 | if (buf->bytesused == stream->queue.buf_used || |
35f02a68 | 940 | stream->bulk.payload_size == stream->bulk.max_payload_size) { |
3d95e932 | 941 | if (buf->bytesused == stream->queue.buf_used) { |
35f02a68 | 942 | stream->queue.buf_used = 0; |
d7c0d439 | 943 | buf->state = UVC_BUF_STATE_READY; |
6998b6fb | 944 | buf->buf.v4l2_buf.sequence = ++stream->sequence; |
35f02a68 LP |
945 | uvc_queue_next_buffer(&stream->queue, buf); |
946 | stream->last_fid ^= UVC_STREAM_FID; | |
ff924203 LP |
947 | } |
948 | ||
35f02a68 LP |
949 | stream->bulk.header_size = 0; |
950 | stream->bulk.payload_size = 0; | |
ff924203 LP |
951 | } |
952 | ||
35f02a68 | 953 | urb->transfer_buffer_length = stream->urb_size - len; |
ff924203 LP |
954 | } |
955 | ||
c0efd232 LP |
956 | static void uvc_video_complete(struct urb *urb) |
957 | { | |
35f02a68 LP |
958 | struct uvc_streaming *stream = urb->context; |
959 | struct uvc_video_queue *queue = &stream->queue; | |
c0efd232 LP |
960 | struct uvc_buffer *buf = NULL; |
961 | unsigned long flags; | |
962 | int ret; | |
963 | ||
964 | switch (urb->status) { | |
965 | case 0: | |
966 | break; | |
967 | ||
968 | default: | |
969 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
970 | "completion handler.\n", urb->status); | |
971 | ||
972 | case -ENOENT: /* usb_kill_urb() called. */ | |
35f02a68 | 973 | if (stream->frozen) |
c0efd232 LP |
974 | return; |
975 | ||
976 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
977 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
978 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
979 | return; | |
980 | } | |
981 | ||
982 | spin_lock_irqsave(&queue->irqlock, flags); | |
983 | if (!list_empty(&queue->irqqueue)) | |
984 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
985 | queue); | |
986 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
987 | ||
35f02a68 | 988 | stream->decode(urb, stream, buf); |
c0efd232 LP |
989 | |
990 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
991 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
992 | ret); | |
993 | } | |
994 | } | |
995 | ||
e01117c8 LP |
996 | /* |
997 | * Free transfer buffers. | |
998 | */ | |
35f02a68 | 999 | static void uvc_free_urb_buffers(struct uvc_streaming *stream) |
e01117c8 LP |
1000 | { |
1001 | unsigned int i; | |
1002 | ||
1003 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 | 1004 | if (stream->urb_buffer[i]) { |
3e0ac671 | 1005 | #ifndef CONFIG_DMA_NONCOHERENT |
997ea58e | 1006 | usb_free_coherent(stream->dev->udev, stream->urb_size, |
35f02a68 | 1007 | stream->urb_buffer[i], stream->urb_dma[i]); |
3e0ac671 AC |
1008 | #else |
1009 | kfree(stream->urb_buffer[i]); | |
1010 | #endif | |
35f02a68 | 1011 | stream->urb_buffer[i] = NULL; |
e01117c8 LP |
1012 | } |
1013 | } | |
1014 | ||
35f02a68 | 1015 | stream->urb_size = 0; |
e01117c8 LP |
1016 | } |
1017 | ||
1018 | /* | |
1019 | * Allocate transfer buffers. This function can be called with buffers | |
1020 | * already allocated when resuming from suspend, in which case it will | |
1021 | * return without touching the buffers. | |
1022 | * | |
efdc8a95 LP |
1023 | * Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the |
1024 | * system is too low on memory try successively smaller numbers of packets | |
1025 | * until allocation succeeds. | |
1026 | * | |
1027 | * Return the number of allocated packets on success or 0 when out of memory. | |
e01117c8 | 1028 | */ |
35f02a68 | 1029 | static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, |
efdc8a95 | 1030 | unsigned int size, unsigned int psize, gfp_t gfp_flags) |
e01117c8 | 1031 | { |
efdc8a95 | 1032 | unsigned int npackets; |
e01117c8 LP |
1033 | unsigned int i; |
1034 | ||
1035 | /* Buffers are already allocated, bail out. */ | |
35f02a68 LP |
1036 | if (stream->urb_size) |
1037 | return stream->urb_size / psize; | |
e01117c8 | 1038 | |
efdc8a95 | 1039 | /* Compute the number of packets. Bulk endpoints might transfer UVC |
25985edc | 1040 | * payloads across multiple URBs. |
efdc8a95 LP |
1041 | */ |
1042 | npackets = DIV_ROUND_UP(size, psize); | |
1043 | if (npackets > UVC_MAX_PACKETS) | |
1044 | npackets = UVC_MAX_PACKETS; | |
1045 | ||
1046 | /* Retry allocations until one succeed. */ | |
1047 | for (; npackets > 1; npackets /= 2) { | |
1048 | for (i = 0; i < UVC_URBS; ++i) { | |
fd1b6bbb | 1049 | stream->urb_size = psize * npackets; |
3e0ac671 | 1050 | #ifndef CONFIG_DMA_NONCOHERENT |
997ea58e | 1051 | stream->urb_buffer[i] = usb_alloc_coherent( |
fd1b6bbb | 1052 | stream->dev->udev, stream->urb_size, |
35f02a68 | 1053 | gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]); |
3e0ac671 AC |
1054 | #else |
1055 | stream->urb_buffer[i] = | |
1056 | kmalloc(stream->urb_size, gfp_flags | __GFP_NOWARN); | |
1057 | #endif | |
35f02a68 LP |
1058 | if (!stream->urb_buffer[i]) { |
1059 | uvc_free_urb_buffers(stream); | |
efdc8a95 LP |
1060 | break; |
1061 | } | |
1062 | } | |
1063 | ||
1064 | if (i == UVC_URBS) { | |
663a4192 LP |
1065 | uvc_trace(UVC_TRACE_VIDEO, "Allocated %u URB buffers " |
1066 | "of %ux%u bytes each.\n", UVC_URBS, npackets, | |
1067 | psize); | |
efdc8a95 | 1068 | return npackets; |
e01117c8 LP |
1069 | } |
1070 | } | |
1071 | ||
663a4192 LP |
1072 | uvc_trace(UVC_TRACE_VIDEO, "Failed to allocate URB buffers (%u bytes " |
1073 | "per packet).\n", psize); | |
e01117c8 LP |
1074 | return 0; |
1075 | } | |
1076 | ||
c0efd232 LP |
1077 | /* |
1078 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
1079 | */ | |
35f02a68 | 1080 | static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) |
c0efd232 LP |
1081 | { |
1082 | struct urb *urb; | |
1083 | unsigned int i; | |
1084 | ||
7bc5edb0 OR |
1085 | uvc_video_stats_stop(stream); |
1086 | ||
c0efd232 | 1087 | for (i = 0; i < UVC_URBS; ++i) { |
35f02a68 LP |
1088 | urb = stream->urb[i]; |
1089 | if (urb == NULL) | |
c0efd232 LP |
1090 | continue; |
1091 | ||
1092 | usb_kill_urb(urb); | |
c0efd232 | 1093 | usb_free_urb(urb); |
35f02a68 | 1094 | stream->urb[i] = NULL; |
c0efd232 | 1095 | } |
e01117c8 LP |
1096 | |
1097 | if (free_buffers) | |
35f02a68 | 1098 | uvc_free_urb_buffers(stream); |
c0efd232 LP |
1099 | } |
1100 | ||
1101 | /* | |
1102 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
1103 | * is given by the endpoint. | |
1104 | */ | |
35f02a68 | 1105 | static int uvc_init_video_isoc(struct uvc_streaming *stream, |
29135878 | 1106 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
1107 | { |
1108 | struct urb *urb; | |
1109 | unsigned int npackets, i, j; | |
efdc8a95 LP |
1110 | u16 psize; |
1111 | u32 size; | |
c0efd232 | 1112 | |
c0efd232 LP |
1113 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
1114 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
35f02a68 | 1115 | size = stream->ctrl.dwMaxVideoFrameSize; |
c0efd232 | 1116 | |
35f02a68 | 1117 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 LP |
1118 | if (npackets == 0) |
1119 | return -ENOMEM; | |
c0efd232 LP |
1120 | |
1121 | size = npackets * psize; | |
1122 | ||
1123 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 1124 | urb = usb_alloc_urb(npackets, gfp_flags); |
c0efd232 | 1125 | if (urb == NULL) { |
35f02a68 | 1126 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
1127 | return -ENOMEM; |
1128 | } | |
1129 | ||
35f02a68 LP |
1130 | urb->dev = stream->dev->udev; |
1131 | urb->context = stream; | |
1132 | urb->pipe = usb_rcvisocpipe(stream->dev->udev, | |
c0efd232 | 1133 | ep->desc.bEndpointAddress); |
3e0ac671 | 1134 | #ifndef CONFIG_DMA_NONCOHERENT |
c0efd232 | 1135 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
3e0ac671 AC |
1136 | urb->transfer_dma = stream->urb_dma[i]; |
1137 | #else | |
1138 | urb->transfer_flags = URB_ISO_ASAP; | |
1139 | #endif | |
c0efd232 | 1140 | urb->interval = ep->desc.bInterval; |
35f02a68 | 1141 | urb->transfer_buffer = stream->urb_buffer[i]; |
c0efd232 LP |
1142 | urb->complete = uvc_video_complete; |
1143 | urb->number_of_packets = npackets; | |
1144 | urb->transfer_buffer_length = size; | |
1145 | ||
1146 | for (j = 0; j < npackets; ++j) { | |
1147 | urb->iso_frame_desc[j].offset = j * psize; | |
1148 | urb->iso_frame_desc[j].length = psize; | |
1149 | } | |
1150 | ||
35f02a68 | 1151 | stream->urb[i] = urb; |
c0efd232 LP |
1152 | } |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
1157 | /* | |
1158 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
1159 | * given by the endpoint. | |
1160 | */ | |
35f02a68 | 1161 | static int uvc_init_video_bulk(struct uvc_streaming *stream, |
29135878 | 1162 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
1163 | { |
1164 | struct urb *urb; | |
efdc8a95 LP |
1165 | unsigned int npackets, pipe, i; |
1166 | u16 psize; | |
1167 | u32 size; | |
1168 | ||
c0efd232 | 1169 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; |
35f02a68 LP |
1170 | size = stream->ctrl.dwMaxPayloadTransferSize; |
1171 | stream->bulk.max_payload_size = size; | |
c0efd232 | 1172 | |
35f02a68 | 1173 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 | 1174 | if (npackets == 0) |
e01117c8 LP |
1175 | return -ENOMEM; |
1176 | ||
efdc8a95 LP |
1177 | size = npackets * psize; |
1178 | ||
ff924203 | 1179 | if (usb_endpoint_dir_in(&ep->desc)) |
35f02a68 | 1180 | pipe = usb_rcvbulkpipe(stream->dev->udev, |
ff924203 LP |
1181 | ep->desc.bEndpointAddress); |
1182 | else | |
35f02a68 | 1183 | pipe = usb_sndbulkpipe(stream->dev->udev, |
ff924203 LP |
1184 | ep->desc.bEndpointAddress); |
1185 | ||
35f02a68 | 1186 | if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) |
ff924203 | 1187 | size = 0; |
c0efd232 LP |
1188 | |
1189 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 1190 | urb = usb_alloc_urb(0, gfp_flags); |
c0efd232 | 1191 | if (urb == NULL) { |
35f02a68 | 1192 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
1193 | return -ENOMEM; |
1194 | } | |
1195 | ||
35f02a68 LP |
1196 | usb_fill_bulk_urb(urb, stream->dev->udev, pipe, |
1197 | stream->urb_buffer[i], size, uvc_video_complete, | |
1198 | stream); | |
3e0ac671 | 1199 | #ifndef CONFIG_DMA_NONCOHERENT |
c0efd232 | 1200 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
35f02a68 | 1201 | urb->transfer_dma = stream->urb_dma[i]; |
3e0ac671 | 1202 | #endif |
c0efd232 | 1203 | |
35f02a68 | 1204 | stream->urb[i] = urb; |
c0efd232 LP |
1205 | } |
1206 | ||
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
1212 | */ | |
35f02a68 | 1213 | static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags) |
c0efd232 | 1214 | { |
35f02a68 | 1215 | struct usb_interface *intf = stream->intf; |
2c4d9de8 LP |
1216 | struct usb_host_endpoint *ep; |
1217 | unsigned int i; | |
c0efd232 LP |
1218 | int ret; |
1219 | ||
650b95fe | 1220 | stream->sequence = -1; |
35f02a68 LP |
1221 | stream->last_fid = -1; |
1222 | stream->bulk.header_size = 0; | |
1223 | stream->bulk.skip_payload = 0; | |
1224 | stream->bulk.payload_size = 0; | |
c0efd232 | 1225 | |
7bc5edb0 OR |
1226 | uvc_video_stats_start(stream); |
1227 | ||
c0efd232 | 1228 | if (intf->num_altsetting > 1) { |
2c4d9de8 LP |
1229 | struct usb_host_endpoint *best_ep = NULL; |
1230 | unsigned int best_psize = 3 * 1024; | |
1231 | unsigned int bandwidth; | |
1232 | unsigned int uninitialized_var(altsetting); | |
1233 | int intfnum = stream->intfnum; | |
1234 | ||
c0efd232 | 1235 | /* Isochronous endpoint, select the alternate setting. */ |
35f02a68 | 1236 | bandwidth = stream->ctrl.dwMaxPayloadTransferSize; |
c0efd232 LP |
1237 | |
1238 | if (bandwidth == 0) { | |
663a4192 LP |
1239 | uvc_trace(UVC_TRACE_VIDEO, "Device requested null " |
1240 | "bandwidth, defaulting to lowest.\n"); | |
c0efd232 | 1241 | bandwidth = 1; |
663a4192 LP |
1242 | } else { |
1243 | uvc_trace(UVC_TRACE_VIDEO, "Device requested %u " | |
1244 | "B/frame bandwidth.\n", bandwidth); | |
c0efd232 LP |
1245 | } |
1246 | ||
1247 | for (i = 0; i < intf->num_altsetting; ++i) { | |
2c4d9de8 LP |
1248 | struct usb_host_interface *alts; |
1249 | unsigned int psize; | |
1250 | ||
c0efd232 LP |
1251 | alts = &intf->altsetting[i]; |
1252 | ep = uvc_find_endpoint(alts, | |
35f02a68 | 1253 | stream->header.bEndpointAddress); |
c0efd232 LP |
1254 | if (ep == NULL) |
1255 | continue; | |
1256 | ||
1257 | /* Check if the bandwidth is high enough. */ | |
1258 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
1259 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
2c4d9de8 LP |
1260 | if (psize >= bandwidth && psize <= best_psize) { |
1261 | altsetting = i; | |
1262 | best_psize = psize; | |
1263 | best_ep = ep; | |
1264 | } | |
c0efd232 LP |
1265 | } |
1266 | ||
2c4d9de8 | 1267 | if (best_ep == NULL) { |
663a4192 LP |
1268 | uvc_trace(UVC_TRACE_VIDEO, "No fast enough alt setting " |
1269 | "for requested bandwidth.\n"); | |
c0efd232 | 1270 | return -EIO; |
663a4192 | 1271 | } |
c0efd232 | 1272 | |
2c4d9de8 LP |
1273 | uvc_trace(UVC_TRACE_VIDEO, "Selecting alternate setting %u " |
1274 | "(%u B/frame bandwidth).\n", altsetting, best_psize); | |
1275 | ||
1276 | ret = usb_set_interface(stream->dev->udev, intfnum, altsetting); | |
35f02a68 | 1277 | if (ret < 0) |
c0efd232 LP |
1278 | return ret; |
1279 | ||
2c4d9de8 | 1280 | ret = uvc_init_video_isoc(stream, best_ep, gfp_flags); |
c0efd232 LP |
1281 | } else { |
1282 | /* Bulk endpoint, proceed to URB initialization. */ | |
1283 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
35f02a68 | 1284 | stream->header.bEndpointAddress); |
c0efd232 LP |
1285 | if (ep == NULL) |
1286 | return -EIO; | |
1287 | ||
35f02a68 | 1288 | ret = uvc_init_video_bulk(stream, ep, gfp_flags); |
c0efd232 LP |
1289 | } |
1290 | ||
1291 | if (ret < 0) | |
1292 | return ret; | |
1293 | ||
1294 | /* Submit the URBs. */ | |
1295 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
1296 | ret = usb_submit_urb(stream->urb[i], gfp_flags); |
1297 | if (ret < 0) { | |
c0efd232 LP |
1298 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
1299 | "(%d).\n", i, ret); | |
35f02a68 | 1300 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
1301 | return ret; |
1302 | } | |
1303 | } | |
1304 | ||
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | /* -------------------------------------------------------------------------- | |
1309 | * Suspend/resume | |
1310 | */ | |
1311 | ||
1312 | /* | |
1313 | * Stop streaming without disabling the video queue. | |
1314 | * | |
1315 | * To let userspace applications resume without trouble, we must not touch the | |
1316 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
1317 | * completion handler won't try to cancel the queue when we kill the URBs. | |
1318 | */ | |
35f02a68 | 1319 | int uvc_video_suspend(struct uvc_streaming *stream) |
c0efd232 | 1320 | { |
35f02a68 | 1321 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1322 | return 0; |
1323 | ||
35f02a68 LP |
1324 | stream->frozen = 1; |
1325 | uvc_uninit_video(stream, 0); | |
1326 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
c0efd232 LP |
1327 | return 0; |
1328 | } | |
1329 | ||
1330 | /* | |
2c2d264b | 1331 | * Reconfigure the video interface and restart streaming if it was enabled |
c0efd232 LP |
1332 | * before suspend. |
1333 | * | |
1334 | * If an error occurs, disable the video queue. This will wake all pending | |
1335 | * buffers, making sure userspace applications are notified of the problem | |
1336 | * instead of waiting forever. | |
1337 | */ | |
d59a7b1d | 1338 | int uvc_video_resume(struct uvc_streaming *stream, int reset) |
c0efd232 LP |
1339 | { |
1340 | int ret; | |
1341 | ||
d59a7b1d ML |
1342 | /* If the bus has been reset on resume, set the alternate setting to 0. |
1343 | * This should be the default value, but some devices crash or otherwise | |
1344 | * misbehave if they don't receive a SET_INTERFACE request before any | |
1345 | * other video control request. | |
1346 | */ | |
1347 | if (reset) | |
1348 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1349 | ||
35f02a68 | 1350 | stream->frozen = 0; |
c0efd232 | 1351 | |
35f02a68 LP |
1352 | ret = uvc_commit_video(stream, &stream->ctrl); |
1353 | if (ret < 0) { | |
1354 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1355 | return ret; |
1356 | } | |
1357 | ||
35f02a68 | 1358 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1359 | return 0; |
1360 | ||
35f02a68 LP |
1361 | ret = uvc_init_video(stream, GFP_NOIO); |
1362 | if (ret < 0) | |
1363 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1364 | |
1365 | return ret; | |
1366 | } | |
1367 | ||
1368 | /* ------------------------------------------------------------------------ | |
1369 | * Video device | |
1370 | */ | |
1371 | ||
1372 | /* | |
2c2d264b LP |
1373 | * Initialize the UVC video device by switching to alternate setting 0 and |
1374 | * retrieve the default format. | |
c0efd232 LP |
1375 | * |
1376 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
1377 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
1378 | * violation, so try to silently fix the values if possible. | |
1379 | * | |
1380 | * This function is called before registering the device with V4L. | |
1381 | */ | |
35f02a68 | 1382 | int uvc_video_init(struct uvc_streaming *stream) |
c0efd232 | 1383 | { |
35f02a68 | 1384 | struct uvc_streaming_control *probe = &stream->ctrl; |
c0efd232 LP |
1385 | struct uvc_format *format = NULL; |
1386 | struct uvc_frame *frame = NULL; | |
1387 | unsigned int i; | |
1388 | int ret; | |
1389 | ||
35f02a68 | 1390 | if (stream->nformats == 0) { |
c0efd232 LP |
1391 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); |
1392 | return -EINVAL; | |
1393 | } | |
1394 | ||
35f02a68 LP |
1395 | atomic_set(&stream->active, 0); |
1396 | ||
1397 | /* Initialize the video buffers queue. */ | |
9bde9f26 | 1398 | uvc_queue_init(&stream->queue, stream->type, !uvc_no_drop_param); |
35f02a68 | 1399 | |
c0efd232 LP |
1400 | /* Alternate setting 0 should be the default, yet the XBox Live Vision |
1401 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
1402 | * they don't receive a SET_INTERFACE request before any other video | |
1403 | * control request. | |
1404 | */ | |
35f02a68 | 1405 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); |
c0efd232 | 1406 | |
72362422 LP |
1407 | /* Set the streaming probe control with default streaming parameters |
1408 | * retrieved from the device. Webcams that don't suport GET_DEF | |
1409 | * requests on the probe control will just keep their current streaming | |
1410 | * parameters. | |
c0efd232 | 1411 | */ |
35f02a68 LP |
1412 | if (uvc_get_video_ctrl(stream, probe, 1, UVC_GET_DEF) == 0) |
1413 | uvc_set_video_ctrl(stream, probe, 1); | |
72362422 LP |
1414 | |
1415 | /* Initialize the streaming parameters with the probe control current | |
1416 | * value. This makes sure SET_CUR requests on the streaming commit | |
1417 | * control will always use values retrieved from a successful GET_CUR | |
1418 | * request on the probe control, as required by the UVC specification. | |
1419 | */ | |
35f02a68 | 1420 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 1421 | if (ret < 0) |
c0efd232 LP |
1422 | return ret; |
1423 | ||
1424 | /* Check if the default format descriptor exists. Use the first | |
1425 | * available format otherwise. | |
1426 | */ | |
35f02a68 LP |
1427 | for (i = stream->nformats; i > 0; --i) { |
1428 | format = &stream->format[i-1]; | |
c0efd232 LP |
1429 | if (format->index == probe->bFormatIndex) |
1430 | break; | |
1431 | } | |
1432 | ||
1433 | if (format->nframes == 0) { | |
1434 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
1435 | "default format.\n"); | |
1436 | return -EINVAL; | |
1437 | } | |
1438 | ||
1439 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
1440 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
1441 | * descriptor with bFrameIndex set to zero. If the default frame | |
078f8947 | 1442 | * descriptor is not found, use the first available frame. |
c0efd232 LP |
1443 | */ |
1444 | for (i = format->nframes; i > 0; --i) { | |
1445 | frame = &format->frame[i-1]; | |
1446 | if (frame->bFrameIndex == probe->bFrameIndex) | |
1447 | break; | |
1448 | } | |
1449 | ||
c0efd232 LP |
1450 | probe->bFormatIndex = format->index; |
1451 | probe->bFrameIndex = frame->bFrameIndex; | |
c0efd232 | 1452 | |
35f02a68 LP |
1453 | stream->cur_format = format; |
1454 | stream->cur_frame = frame; | |
c0efd232 LP |
1455 | |
1456 | /* Select the video decoding function */ | |
35f02a68 LP |
1457 | if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { |
1458 | if (stream->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
1459 | stream->decode = uvc_video_decode_isight; | |
1460 | else if (stream->intf->num_altsetting > 1) | |
1461 | stream->decode = uvc_video_decode_isoc; | |
ff924203 | 1462 | else |
35f02a68 | 1463 | stream->decode = uvc_video_decode_bulk; |
ff924203 | 1464 | } else { |
35f02a68 LP |
1465 | if (stream->intf->num_altsetting == 1) |
1466 | stream->decode = uvc_video_encode_bulk; | |
ff924203 LP |
1467 | else { |
1468 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | |
1469 | "supported for video output devices.\n"); | |
1470 | return -EINVAL; | |
1471 | } | |
1472 | } | |
c0efd232 LP |
1473 | |
1474 | return 0; | |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * Enable or disable the video stream. | |
1479 | */ | |
35f02a68 | 1480 | int uvc_video_enable(struct uvc_streaming *stream, int enable) |
c0efd232 LP |
1481 | { |
1482 | int ret; | |
1483 | ||
1484 | if (!enable) { | |
35f02a68 LP |
1485 | uvc_uninit_video(stream, 1); |
1486 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1487 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1488 | return 0; |
1489 | } | |
1490 | ||
35f02a68 LP |
1491 | ret = uvc_queue_enable(&stream->queue, 1); |
1492 | if (ret < 0) | |
c0efd232 LP |
1493 | return ret; |
1494 | ||
23867b25 | 1495 | /* Commit the streaming parameters. */ |
35f02a68 | 1496 | ret = uvc_commit_video(stream, &stream->ctrl); |
aa122d42 SS |
1497 | if (ret < 0) { |
1498 | uvc_queue_enable(&stream->queue, 0); | |
23867b25 | 1499 | return ret; |
aa122d42 | 1500 | } |
23867b25 | 1501 | |
24c3aae0 LP |
1502 | ret = uvc_init_video(stream, GFP_KERNEL); |
1503 | if (ret < 0) { | |
1504 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1505 | uvc_queue_enable(&stream->queue, 0); | |
1506 | } | |
f87086e3 | 1507 | |
24c3aae0 LP |
1508 | return ret; |
1509 | } |