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> | |
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 | { | |
92 | struct uvc_format *format; | |
078f8947 LP |
93 | struct uvc_frame *frame = NULL; |
94 | unsigned int i; | |
c0efd232 LP |
95 | |
96 | if (ctrl->bFormatIndex <= 0 || | |
35f02a68 | 97 | ctrl->bFormatIndex > stream->nformats) |
c0efd232 LP |
98 | return; |
99 | ||
35f02a68 | 100 | format = &stream->format[ctrl->bFormatIndex - 1]; |
c0efd232 | 101 | |
078f8947 LP |
102 | for (i = 0; i < format->nframes; ++i) { |
103 | if (format->frame[i].bFrameIndex == ctrl->bFrameIndex) { | |
104 | frame = &format->frame[i]; | |
105 | break; | |
106 | } | |
107 | } | |
c0efd232 | 108 | |
078f8947 LP |
109 | if (frame == NULL) |
110 | return; | |
c0efd232 LP |
111 | |
112 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || | |
113 | (ctrl->dwMaxVideoFrameSize == 0 && | |
35f02a68 | 114 | stream->dev->uvc_version < 0x0110)) |
c0efd232 LP |
115 | ctrl->dwMaxVideoFrameSize = |
116 | frame->dwMaxVideoFrameBufferSize; | |
50144aee | 117 | |
a2e35af6 LP |
118 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) && |
119 | stream->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH && | |
35f02a68 | 120 | stream->intf->num_altsetting > 1) { |
50144aee LP |
121 | u32 interval; |
122 | u32 bandwidth; | |
123 | ||
124 | interval = (ctrl->dwFrameInterval > 100000) | |
125 | ? ctrl->dwFrameInterval | |
126 | : frame->dwFrameInterval[0]; | |
127 | ||
128 | /* Compute a bandwidth estimation by multiplying the frame | |
129 | * size by the number of video frames per second, divide the | |
130 | * result by the number of USB frames (or micro-frames for | |
131 | * high-speed devices) per second and add the UVC header size | |
132 | * (assumed to be 12 bytes long). | |
133 | */ | |
134 | bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp; | |
135 | bandwidth *= 10000000 / interval + 1; | |
136 | bandwidth /= 1000; | |
35f02a68 | 137 | if (stream->dev->udev->speed == USB_SPEED_HIGH) |
50144aee LP |
138 | bandwidth /= 8; |
139 | bandwidth += 12; | |
140 | ||
9bb7262d LP |
141 | /* The bandwidth estimate is too low for many cameras. Don't use |
142 | * maximum packet sizes lower than 1024 bytes to try and work | |
143 | * around the problem. According to measurements done on two | |
144 | * different camera models, the value is high enough to get most | |
145 | * resolutions working while not preventing two simultaneous | |
146 | * VGA streams at 15 fps. | |
147 | */ | |
148 | bandwidth = max_t(u32, bandwidth, 1024); | |
149 | ||
50144aee LP |
150 | ctrl->dwMaxPayloadTransferSize = bandwidth; |
151 | } | |
c0efd232 LP |
152 | } |
153 | ||
35f02a68 | 154 | static int uvc_get_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
155 | struct uvc_streaming_control *ctrl, int probe, __u8 query) |
156 | { | |
04793dd0 LP |
157 | __u8 *data; |
158 | __u16 size; | |
c0efd232 LP |
159 | int ret; |
160 | ||
35f02a68 | 161 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; |
d2be7643 JL |
162 | if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) && |
163 | query == UVC_GET_DEF) | |
164 | return -EIO; | |
165 | ||
04793dd0 LP |
166 | data = kmalloc(size, GFP_KERNEL); |
167 | if (data == NULL) | |
168 | return -ENOMEM; | |
169 | ||
35f02a68 | 170 | ret = __uvc_query_ctrl(stream->dev, query, 0, stream->intfnum, |
b482d923 | 171 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, |
b232a012 | 172 | size, uvc_timeout_param); |
44f0079e | 173 | |
b482d923 | 174 | if ((query == UVC_GET_MIN || query == UVC_GET_MAX) && ret == 2) { |
44f0079e LP |
175 | /* Some cameras, mostly based on Bison Electronics chipsets, |
176 | * answer a GET_MIN or GET_MAX request with the wCompQuality | |
177 | * field only. | |
178 | */ | |
35f02a68 | 179 | uvc_warn_once(stream->dev, UVC_WARN_MINMAX, "UVC non " |
44f0079e LP |
180 | "compliance - GET_MIN/MAX(PROBE) incorrectly " |
181 | "supported. Enabling workaround.\n"); | |
ddb0b34f | 182 | memset(ctrl, 0, sizeof *ctrl); |
44f0079e LP |
183 | ctrl->wCompQuality = le16_to_cpup((__le16 *)data); |
184 | ret = 0; | |
04793dd0 | 185 | goto out; |
b482d923 | 186 | } else if (query == UVC_GET_DEF && probe == 1 && ret != size) { |
44f0079e LP |
187 | /* Many cameras don't support the GET_DEF request on their |
188 | * video probe control. Warn once and return, the caller will | |
189 | * fall back to GET_CUR. | |
190 | */ | |
35f02a68 | 191 | uvc_warn_once(stream->dev, UVC_WARN_PROBE_DEF, "UVC non " |
44f0079e LP |
192 | "compliance - GET_DEF(PROBE) not supported. " |
193 | "Enabling workaround.\n"); | |
194 | ret = -EIO; | |
195 | goto out; | |
196 | } else if (ret != size) { | |
197 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : " | |
198 | "%d (exp. %u).\n", query, probe ? "probe" : "commit", | |
199 | ret, size); | |
200 | ret = -EIO; | |
201 | goto out; | |
202 | } | |
c0efd232 LP |
203 | |
204 | ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); | |
205 | ctrl->bFormatIndex = data[2]; | |
206 | ctrl->bFrameIndex = data[3]; | |
207 | ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]); | |
208 | ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]); | |
209 | ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]); | |
210 | ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]); | |
211 | ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]); | |
212 | ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]); | |
4d3939f6 LP |
213 | ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]); |
214 | ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]); | |
c0efd232 LP |
215 | |
216 | if (size == 34) { | |
4d3939f6 | 217 | ctrl->dwClockFrequency = get_unaligned_le32(&data[26]); |
c0efd232 LP |
218 | ctrl->bmFramingInfo = data[30]; |
219 | ctrl->bPreferedVersion = data[31]; | |
220 | ctrl->bMinVersion = data[32]; | |
221 | ctrl->bMaxVersion = data[33]; | |
222 | } else { | |
35f02a68 | 223 | ctrl->dwClockFrequency = stream->dev->clock_frequency; |
c0efd232 LP |
224 | ctrl->bmFramingInfo = 0; |
225 | ctrl->bPreferedVersion = 0; | |
226 | ctrl->bMinVersion = 0; | |
227 | ctrl->bMaxVersion = 0; | |
228 | } | |
229 | ||
50144aee LP |
230 | /* Some broken devices return null or wrong dwMaxVideoFrameSize and |
231 | * dwMaxPayloadTransferSize fields. Try to get the value from the | |
232 | * format and frame descriptors. | |
c0efd232 | 233 | */ |
35f02a68 | 234 | uvc_fixup_video_ctrl(stream, ctrl); |
44f0079e | 235 | ret = 0; |
c0efd232 | 236 | |
04793dd0 LP |
237 | out: |
238 | kfree(data); | |
239 | return ret; | |
c0efd232 LP |
240 | } |
241 | ||
35f02a68 | 242 | static int uvc_set_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
243 | struct uvc_streaming_control *ctrl, int probe) |
244 | { | |
04793dd0 LP |
245 | __u8 *data; |
246 | __u16 size; | |
247 | int ret; | |
c0efd232 | 248 | |
35f02a68 | 249 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; |
04793dd0 LP |
250 | data = kzalloc(size, GFP_KERNEL); |
251 | if (data == NULL) | |
252 | return -ENOMEM; | |
c0efd232 LP |
253 | |
254 | *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint); | |
255 | data[2] = ctrl->bFormatIndex; | |
256 | data[3] = ctrl->bFrameIndex; | |
257 | *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval); | |
258 | *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate); | |
259 | *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate); | |
260 | *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality); | |
261 | *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize); | |
262 | *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay); | |
4d3939f6 LP |
263 | put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]); |
264 | put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]); | |
c0efd232 LP |
265 | |
266 | if (size == 34) { | |
4d3939f6 | 267 | put_unaligned_le32(ctrl->dwClockFrequency, &data[26]); |
c0efd232 LP |
268 | data[30] = ctrl->bmFramingInfo; |
269 | data[31] = ctrl->bPreferedVersion; | |
270 | data[32] = ctrl->bMinVersion; | |
271 | data[33] = ctrl->bMaxVersion; | |
272 | } | |
273 | ||
35f02a68 | 274 | ret = __uvc_query_ctrl(stream->dev, UVC_SET_CUR, 0, stream->intfnum, |
b482d923 | 275 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, |
b232a012 | 276 | size, uvc_timeout_param); |
44f0079e LP |
277 | if (ret != size) { |
278 | uvc_printk(KERN_ERR, "Failed to set UVC %s control : " | |
279 | "%d (exp. %u).\n", probe ? "probe" : "commit", | |
280 | ret, size); | |
281 | ret = -EIO; | |
282 | } | |
04793dd0 LP |
283 | |
284 | kfree(data); | |
285 | return ret; | |
c0efd232 LP |
286 | } |
287 | ||
35f02a68 | 288 | int uvc_probe_video(struct uvc_streaming *stream, |
c0efd232 LP |
289 | struct uvc_streaming_control *probe) |
290 | { | |
291 | struct uvc_streaming_control probe_min, probe_max; | |
292 | __u16 bandwidth; | |
293 | unsigned int i; | |
294 | int ret; | |
295 | ||
c0efd232 LP |
296 | /* Perform probing. The device should adjust the requested values |
297 | * according to its capabilities. However, some devices, namely the | |
298 | * first generation UVC Logitech webcams, don't implement the Video | |
299 | * Probe control properly, and just return the needed bandwidth. For | |
300 | * that reason, if the needed bandwidth exceeds the maximum available | |
301 | * bandwidth, try to lower the quality. | |
302 | */ | |
35f02a68 LP |
303 | ret = uvc_set_video_ctrl(stream, probe, 1); |
304 | if (ret < 0) | |
c0efd232 LP |
305 | goto done; |
306 | ||
307 | /* Get the minimum and maximum values for compression settings. */ | |
35f02a68 LP |
308 | if (!(stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { |
309 | ret = uvc_get_video_ctrl(stream, &probe_min, 1, UVC_GET_MIN); | |
c0efd232 LP |
310 | if (ret < 0) |
311 | goto done; | |
35f02a68 | 312 | ret = uvc_get_video_ctrl(stream, &probe_max, 1, UVC_GET_MAX); |
c0efd232 LP |
313 | if (ret < 0) |
314 | goto done; | |
315 | ||
316 | probe->wCompQuality = probe_max.wCompQuality; | |
317 | } | |
318 | ||
319 | for (i = 0; i < 2; ++i) { | |
35f02a68 | 320 | ret = uvc_set_video_ctrl(stream, probe, 1); |
b482d923 LP |
321 | if (ret < 0) |
322 | goto done; | |
35f02a68 | 323 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 324 | if (ret < 0) |
c0efd232 LP |
325 | goto done; |
326 | ||
35f02a68 | 327 | if (stream->intf->num_altsetting == 1) |
c0efd232 LP |
328 | break; |
329 | ||
330 | bandwidth = probe->dwMaxPayloadTransferSize; | |
35f02a68 | 331 | if (bandwidth <= stream->maxpsize) |
c0efd232 LP |
332 | break; |
333 | ||
35f02a68 | 334 | if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { |
c0efd232 LP |
335 | ret = -ENOSPC; |
336 | goto done; | |
337 | } | |
338 | ||
339 | /* TODO: negotiate compression parameters */ | |
340 | probe->wKeyFrameRate = probe_min.wKeyFrameRate; | |
341 | probe->wPFrameRate = probe_min.wPFrameRate; | |
342 | probe->wCompQuality = probe_max.wCompQuality; | |
343 | probe->wCompWindowSize = probe_min.wCompWindowSize; | |
344 | } | |
345 | ||
346 | done: | |
c0efd232 LP |
347 | return ret; |
348 | } | |
349 | ||
35f02a68 | 350 | int uvc_commit_video(struct uvc_streaming *stream, |
44f0079e LP |
351 | struct uvc_streaming_control *probe) |
352 | { | |
35f02a68 | 353 | return uvc_set_video_ctrl(stream, probe, 0); |
44f0079e LP |
354 | } |
355 | ||
c0efd232 LP |
356 | /* ------------------------------------------------------------------------ |
357 | * Video codecs | |
358 | */ | |
359 | ||
360 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ | |
361 | #define UVC_STREAM_EOH (1 << 7) | |
362 | #define UVC_STREAM_ERR (1 << 6) | |
363 | #define UVC_STREAM_STI (1 << 5) | |
364 | #define UVC_STREAM_RES (1 << 4) | |
365 | #define UVC_STREAM_SCR (1 << 3) | |
366 | #define UVC_STREAM_PTS (1 << 2) | |
367 | #define UVC_STREAM_EOF (1 << 1) | |
368 | #define UVC_STREAM_FID (1 << 0) | |
369 | ||
370 | /* Video payload decoding is handled by uvc_video_decode_start(), | |
371 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
372 | * | |
373 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
374 | * isochronous payload. It processes header data and returns the header size | |
375 | * in bytes if successful. If an error occurs, it returns a negative error | |
376 | * code. The following error codes have special meanings. | |
377 | * | |
378 | * - EAGAIN informs the caller that the current video buffer should be marked | |
379 | * as done, and that the function should be called again with the same data | |
380 | * and a new video buffer. This is used when end of frame conditions can be | |
381 | * reliably detected at the beginning of the next frame only. | |
382 | * | |
383 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
384 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
385 | * made until the next payload. -ENODATA can be used to drop the current | |
386 | * payload if no other error code is appropriate. | |
387 | * | |
388 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
389 | * data to the video buffer. | |
390 | * | |
391 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
392 | * isochronous payload. It performs any additional header data processing and | |
393 | * returns 0 or a negative error code if an error occured. As header data have | |
394 | * already been processed by uvc_video_decode_start, this functions isn't | |
395 | * required to perform sanity checks a second time. | |
396 | * | |
397 | * For isochronous transfers where a payload is always transfered in a single | |
398 | * URB, the three functions will be called in a row. | |
399 | * | |
400 | * To let the decoder process header data and update its internal state even | |
401 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
402 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
403 | * uvc_video_decode_end will never be called with a NULL buffer. | |
404 | */ | |
35f02a68 | 405 | static int uvc_video_decode_start(struct uvc_streaming *stream, |
c0efd232 LP |
406 | struct uvc_buffer *buf, const __u8 *data, int len) |
407 | { | |
408 | __u8 fid; | |
409 | ||
410 | /* Sanity checks: | |
411 | * - packet must be at least 2 bytes long | |
412 | * - bHeaderLength value must be at least 2 bytes (see above) | |
413 | * - bHeaderLength value can't be larger than the packet size. | |
414 | */ | |
415 | if (len < 2 || data[0] < 2 || data[0] > len) | |
416 | return -EINVAL; | |
417 | ||
418 | /* Skip payloads marked with the error bit ("error frames"). */ | |
419 | if (data[1] & UVC_STREAM_ERR) { | |
420 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | |
421 | "set).\n"); | |
422 | return -ENODATA; | |
423 | } | |
424 | ||
425 | fid = data[1] & UVC_STREAM_FID; | |
426 | ||
650b95fe LP |
427 | /* Increase the sequence number regardless of any buffer states, so |
428 | * that discontinuous sequence numbers always indicate lost frames. | |
429 | */ | |
430 | if (stream->last_fid != fid) | |
431 | stream->sequence++; | |
432 | ||
c0efd232 LP |
433 | /* Store the payload FID bit and return immediately when the buffer is |
434 | * NULL. | |
435 | */ | |
436 | if (buf == NULL) { | |
35f02a68 | 437 | stream->last_fid = fid; |
c0efd232 LP |
438 | return -ENODATA; |
439 | } | |
440 | ||
441 | /* Synchronize to the input stream by waiting for the FID bit to be | |
442 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
35f02a68 | 443 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
444 | * frame will always be in sync. |
445 | * | |
35f02a68 | 446 | * If the device doesn't toggle the FID bit, invert stream->last_fid |
c0efd232 LP |
447 | * when the EOF bit is set to force synchronisation on the next packet. |
448 | */ | |
449 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
310fe524 LP |
450 | struct timespec ts; |
451 | ||
35f02a68 | 452 | if (fid == stream->last_fid) { |
c0efd232 LP |
453 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " |
454 | "sync).\n"); | |
35f02a68 | 455 | if ((stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && |
c0efd232 | 456 | (data[1] & UVC_STREAM_EOF)) |
35f02a68 | 457 | stream->last_fid ^= UVC_STREAM_FID; |
c0efd232 LP |
458 | return -ENODATA; |
459 | } | |
460 | ||
310fe524 LP |
461 | if (uvc_clock_param == CLOCK_MONOTONIC) |
462 | ktime_get_ts(&ts); | |
463 | else | |
464 | ktime_get_real_ts(&ts); | |
465 | ||
650b95fe | 466 | buf->buf.sequence = stream->sequence; |
310fe524 LP |
467 | buf->buf.timestamp.tv_sec = ts.tv_sec; |
468 | buf->buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; | |
469 | ||
c0efd232 LP |
470 | /* TODO: Handle PTS and SCR. */ |
471 | buf->state = UVC_BUF_STATE_ACTIVE; | |
472 | } | |
473 | ||
474 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
475 | * End of frame detection is better implemented by checking the EOF | |
476 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
477 | * bit), but some devices don't set the bit at end of frame (and the | |
478 | * last payload can be lost anyway). We thus must check if the FID has | |
479 | * been toggled. | |
480 | * | |
35f02a68 | 481 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
482 | * frame will never trigger an end of frame detection. |
483 | * | |
484 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
485 | * as it doesn't make sense to return an empty buffer. This also | |
2c2d264b | 486 | * avoids detecting end of frame conditions at FID toggling if the |
c0efd232 LP |
487 | * previous payload had the EOF bit set. |
488 | */ | |
35f02a68 | 489 | if (fid != stream->last_fid && buf->buf.bytesused != 0) { |
c0efd232 LP |
490 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " |
491 | "toggled).\n"); | |
d7c0d439 | 492 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
493 | return -EAGAIN; |
494 | } | |
495 | ||
35f02a68 | 496 | stream->last_fid = fid; |
c0efd232 LP |
497 | |
498 | return data[0]; | |
499 | } | |
500 | ||
35f02a68 | 501 | static void uvc_video_decode_data(struct uvc_streaming *stream, |
c0efd232 LP |
502 | struct uvc_buffer *buf, const __u8 *data, int len) |
503 | { | |
35f02a68 | 504 | struct uvc_video_queue *queue = &stream->queue; |
c0efd232 LP |
505 | unsigned int maxlen, nbytes; |
506 | void *mem; | |
507 | ||
508 | if (len <= 0) | |
509 | return; | |
510 | ||
511 | /* Copy the video data to the buffer. */ | |
512 | maxlen = buf->buf.length - buf->buf.bytesused; | |
513 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; | |
514 | nbytes = min((unsigned int)len, maxlen); | |
515 | memcpy(mem, data, nbytes); | |
516 | buf->buf.bytesused += nbytes; | |
517 | ||
518 | /* Complete the current frame if the buffer size was exceeded. */ | |
519 | if (len > maxlen) { | |
520 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
d7c0d439 | 521 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
522 | } |
523 | } | |
524 | ||
35f02a68 | 525 | static void uvc_video_decode_end(struct uvc_streaming *stream, |
c0efd232 LP |
526 | struct uvc_buffer *buf, const __u8 *data, int len) |
527 | { | |
528 | /* Mark the buffer as done if the EOF marker is set. */ | |
529 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { | |
530 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); | |
531 | if (data[0] == len) | |
532 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
d7c0d439 | 533 | buf->state = UVC_BUF_STATE_READY; |
35f02a68 LP |
534 | if (stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) |
535 | stream->last_fid ^= UVC_STREAM_FID; | |
c0efd232 LP |
536 | } |
537 | } | |
538 | ||
2c2d264b LP |
539 | /* Video payload encoding is handled by uvc_video_encode_header() and |
540 | * uvc_video_encode_data(). Only bulk transfers are currently supported. | |
541 | * | |
542 | * uvc_video_encode_header is called at the start of a payload. It adds header | |
543 | * data to the transfer buffer and returns the header size. As the only known | |
544 | * UVC output device transfers a whole frame in a single payload, the EOF bit | |
545 | * is always set in the header. | |
546 | * | |
547 | * uvc_video_encode_data is called for every URB and copies the data from the | |
548 | * video buffer to the transfer buffer. | |
549 | */ | |
35f02a68 | 550 | static int uvc_video_encode_header(struct uvc_streaming *stream, |
ff924203 LP |
551 | struct uvc_buffer *buf, __u8 *data, int len) |
552 | { | |
553 | data[0] = 2; /* Header length */ | |
554 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | |
35f02a68 | 555 | | (stream->last_fid & UVC_STREAM_FID); |
ff924203 LP |
556 | return 2; |
557 | } | |
558 | ||
35f02a68 | 559 | static int uvc_video_encode_data(struct uvc_streaming *stream, |
ff924203 LP |
560 | struct uvc_buffer *buf, __u8 *data, int len) |
561 | { | |
35f02a68 | 562 | struct uvc_video_queue *queue = &stream->queue; |
ff924203 LP |
563 | unsigned int nbytes; |
564 | void *mem; | |
565 | ||
566 | /* Copy video data to the URB buffer. */ | |
567 | mem = queue->mem + buf->buf.m.offset + queue->buf_used; | |
568 | nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used); | |
35f02a68 | 569 | nbytes = min(stream->bulk.max_payload_size - stream->bulk.payload_size, |
ff924203 LP |
570 | nbytes); |
571 | memcpy(data, mem, nbytes); | |
572 | ||
573 | queue->buf_used += nbytes; | |
574 | ||
575 | return nbytes; | |
576 | } | |
577 | ||
c0efd232 LP |
578 | /* ------------------------------------------------------------------------ |
579 | * URB handling | |
580 | */ | |
581 | ||
582 | /* | |
583 | * Completion handler for video URBs. | |
584 | */ | |
35f02a68 LP |
585 | static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream, |
586 | struct uvc_buffer *buf) | |
c0efd232 LP |
587 | { |
588 | u8 *mem; | |
589 | int ret, i; | |
590 | ||
591 | for (i = 0; i < urb->number_of_packets; ++i) { | |
592 | if (urb->iso_frame_desc[i].status < 0) { | |
593 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
594 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
9bde9f26 LP |
595 | /* Mark the buffer as faulty. */ |
596 | if (buf != NULL) | |
597 | buf->error = 1; | |
c0efd232 LP |
598 | continue; |
599 | } | |
600 | ||
601 | /* Decode the payload header. */ | |
602 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
603 | do { | |
35f02a68 | 604 | ret = uvc_video_decode_start(stream, buf, mem, |
c0efd232 LP |
605 | urb->iso_frame_desc[i].actual_length); |
606 | if (ret == -EAGAIN) | |
35f02a68 LP |
607 | buf = uvc_queue_next_buffer(&stream->queue, |
608 | buf); | |
c0efd232 LP |
609 | } while (ret == -EAGAIN); |
610 | ||
611 | if (ret < 0) | |
612 | continue; | |
613 | ||
614 | /* Decode the payload data. */ | |
35f02a68 | 615 | uvc_video_decode_data(stream, buf, mem + ret, |
c0efd232 LP |
616 | urb->iso_frame_desc[i].actual_length - ret); |
617 | ||
618 | /* Process the header again. */ | |
35f02a68 | 619 | uvc_video_decode_end(stream, buf, mem, |
08ebd003 | 620 | urb->iso_frame_desc[i].actual_length); |
c0efd232 | 621 | |
9bde9f26 LP |
622 | if (buf->state == UVC_BUF_STATE_READY) { |
623 | if (buf->buf.length != buf->buf.bytesused && | |
624 | !(stream->cur_format->flags & | |
625 | UVC_FMT_FLAG_COMPRESSED)) | |
626 | buf->error = 1; | |
627 | ||
35f02a68 | 628 | buf = uvc_queue_next_buffer(&stream->queue, buf); |
9bde9f26 | 629 | } |
c0efd232 LP |
630 | } |
631 | } | |
632 | ||
35f02a68 LP |
633 | static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream, |
634 | struct uvc_buffer *buf) | |
c0efd232 LP |
635 | { |
636 | u8 *mem; | |
637 | int len, ret; | |
638 | ||
c90e7779 LP |
639 | if (urb->actual_length == 0) |
640 | return; | |
641 | ||
c0efd232 LP |
642 | mem = urb->transfer_buffer; |
643 | len = urb->actual_length; | |
35f02a68 | 644 | stream->bulk.payload_size += len; |
c0efd232 LP |
645 | |
646 | /* If the URB is the first of its payload, decode and save the | |
647 | * header. | |
648 | */ | |
35f02a68 | 649 | if (stream->bulk.header_size == 0 && !stream->bulk.skip_payload) { |
c0efd232 | 650 | do { |
35f02a68 | 651 | ret = uvc_video_decode_start(stream, buf, mem, len); |
c0efd232 | 652 | if (ret == -EAGAIN) |
35f02a68 LP |
653 | buf = uvc_queue_next_buffer(&stream->queue, |
654 | buf); | |
c0efd232 LP |
655 | } while (ret == -EAGAIN); |
656 | ||
657 | /* If an error occured skip the rest of the payload. */ | |
658 | if (ret < 0 || buf == NULL) { | |
35f02a68 | 659 | stream->bulk.skip_payload = 1; |
f8dd4af6 | 660 | } else { |
35f02a68 LP |
661 | memcpy(stream->bulk.header, mem, ret); |
662 | stream->bulk.header_size = ret; | |
c0efd232 | 663 | |
f8dd4af6 LP |
664 | mem += ret; |
665 | len -= ret; | |
666 | } | |
c0efd232 LP |
667 | } |
668 | ||
669 | /* The buffer queue might have been cancelled while a bulk transfer | |
670 | * was in progress, so we can reach here with buf equal to NULL. Make | |
671 | * sure buf is never dereferenced if NULL. | |
672 | */ | |
673 | ||
674 | /* Process video data. */ | |
35f02a68 LP |
675 | if (!stream->bulk.skip_payload && buf != NULL) |
676 | uvc_video_decode_data(stream, buf, mem, len); | |
c0efd232 LP |
677 | |
678 | /* Detect the payload end by a URB smaller than the maximum size (or | |
679 | * a payload size equal to the maximum) and process the header again. | |
680 | */ | |
681 | if (urb->actual_length < urb->transfer_buffer_length || | |
35f02a68 LP |
682 | stream->bulk.payload_size >= stream->bulk.max_payload_size) { |
683 | if (!stream->bulk.skip_payload && buf != NULL) { | |
684 | uvc_video_decode_end(stream, buf, stream->bulk.header, | |
685 | stream->bulk.payload_size); | |
d7c0d439 | 686 | if (buf->state == UVC_BUF_STATE_READY) |
35f02a68 LP |
687 | buf = uvc_queue_next_buffer(&stream->queue, |
688 | buf); | |
c0efd232 LP |
689 | } |
690 | ||
35f02a68 LP |
691 | stream->bulk.header_size = 0; |
692 | stream->bulk.skip_payload = 0; | |
693 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
694 | } |
695 | } | |
696 | ||
35f02a68 LP |
697 | static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream, |
698 | struct uvc_buffer *buf) | |
ff924203 LP |
699 | { |
700 | u8 *mem = urb->transfer_buffer; | |
35f02a68 | 701 | int len = stream->urb_size, ret; |
ff924203 LP |
702 | |
703 | if (buf == NULL) { | |
704 | urb->transfer_buffer_length = 0; | |
705 | return; | |
706 | } | |
707 | ||
708 | /* If the URB is the first of its payload, add the header. */ | |
35f02a68 LP |
709 | if (stream->bulk.header_size == 0) { |
710 | ret = uvc_video_encode_header(stream, buf, mem, len); | |
711 | stream->bulk.header_size = ret; | |
712 | stream->bulk.payload_size += ret; | |
ff924203 LP |
713 | mem += ret; |
714 | len -= ret; | |
715 | } | |
716 | ||
717 | /* Process video data. */ | |
35f02a68 | 718 | ret = uvc_video_encode_data(stream, buf, mem, len); |
ff924203 | 719 | |
35f02a68 | 720 | stream->bulk.payload_size += ret; |
ff924203 LP |
721 | len -= ret; |
722 | ||
35f02a68 LP |
723 | if (buf->buf.bytesused == stream->queue.buf_used || |
724 | stream->bulk.payload_size == stream->bulk.max_payload_size) { | |
725 | if (buf->buf.bytesused == stream->queue.buf_used) { | |
726 | stream->queue.buf_used = 0; | |
d7c0d439 | 727 | buf->state = UVC_BUF_STATE_READY; |
650b95fe | 728 | buf->buf.sequence = ++stream->sequence; |
35f02a68 LP |
729 | uvc_queue_next_buffer(&stream->queue, buf); |
730 | stream->last_fid ^= UVC_STREAM_FID; | |
ff924203 LP |
731 | } |
732 | ||
35f02a68 LP |
733 | stream->bulk.header_size = 0; |
734 | stream->bulk.payload_size = 0; | |
ff924203 LP |
735 | } |
736 | ||
35f02a68 | 737 | urb->transfer_buffer_length = stream->urb_size - len; |
ff924203 LP |
738 | } |
739 | ||
c0efd232 LP |
740 | static void uvc_video_complete(struct urb *urb) |
741 | { | |
35f02a68 LP |
742 | struct uvc_streaming *stream = urb->context; |
743 | struct uvc_video_queue *queue = &stream->queue; | |
c0efd232 LP |
744 | struct uvc_buffer *buf = NULL; |
745 | unsigned long flags; | |
746 | int ret; | |
747 | ||
748 | switch (urb->status) { | |
749 | case 0: | |
750 | break; | |
751 | ||
752 | default: | |
753 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
754 | "completion handler.\n", urb->status); | |
755 | ||
756 | case -ENOENT: /* usb_kill_urb() called. */ | |
35f02a68 | 757 | if (stream->frozen) |
c0efd232 LP |
758 | return; |
759 | ||
760 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
761 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
762 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
763 | return; | |
764 | } | |
765 | ||
766 | spin_lock_irqsave(&queue->irqlock, flags); | |
767 | if (!list_empty(&queue->irqqueue)) | |
768 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
769 | queue); | |
770 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
771 | ||
35f02a68 | 772 | stream->decode(urb, stream, buf); |
c0efd232 LP |
773 | |
774 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
775 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
776 | ret); | |
777 | } | |
778 | } | |
779 | ||
e01117c8 LP |
780 | /* |
781 | * Free transfer buffers. | |
782 | */ | |
35f02a68 | 783 | static void uvc_free_urb_buffers(struct uvc_streaming *stream) |
e01117c8 LP |
784 | { |
785 | unsigned int i; | |
786 | ||
787 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 | 788 | if (stream->urb_buffer[i]) { |
997ea58e | 789 | usb_free_coherent(stream->dev->udev, stream->urb_size, |
35f02a68 LP |
790 | stream->urb_buffer[i], stream->urb_dma[i]); |
791 | stream->urb_buffer[i] = NULL; | |
e01117c8 LP |
792 | } |
793 | } | |
794 | ||
35f02a68 | 795 | stream->urb_size = 0; |
e01117c8 LP |
796 | } |
797 | ||
798 | /* | |
799 | * Allocate transfer buffers. This function can be called with buffers | |
800 | * already allocated when resuming from suspend, in which case it will | |
801 | * return without touching the buffers. | |
802 | * | |
efdc8a95 LP |
803 | * Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the |
804 | * system is too low on memory try successively smaller numbers of packets | |
805 | * until allocation succeeds. | |
806 | * | |
807 | * Return the number of allocated packets on success or 0 when out of memory. | |
e01117c8 | 808 | */ |
35f02a68 | 809 | static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, |
efdc8a95 | 810 | unsigned int size, unsigned int psize, gfp_t gfp_flags) |
e01117c8 | 811 | { |
efdc8a95 | 812 | unsigned int npackets; |
e01117c8 LP |
813 | unsigned int i; |
814 | ||
815 | /* Buffers are already allocated, bail out. */ | |
35f02a68 LP |
816 | if (stream->urb_size) |
817 | return stream->urb_size / psize; | |
e01117c8 | 818 | |
efdc8a95 LP |
819 | /* Compute the number of packets. Bulk endpoints might transfer UVC |
820 | * payloads accross multiple URBs. | |
821 | */ | |
822 | npackets = DIV_ROUND_UP(size, psize); | |
823 | if (npackets > UVC_MAX_PACKETS) | |
824 | npackets = UVC_MAX_PACKETS; | |
825 | ||
826 | /* Retry allocations until one succeed. */ | |
827 | for (; npackets > 1; npackets /= 2) { | |
828 | for (i = 0; i < UVC_URBS; ++i) { | |
fd1b6bbb | 829 | stream->urb_size = psize * npackets; |
997ea58e | 830 | stream->urb_buffer[i] = usb_alloc_coherent( |
fd1b6bbb | 831 | stream->dev->udev, stream->urb_size, |
35f02a68 LP |
832 | gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]); |
833 | if (!stream->urb_buffer[i]) { | |
834 | uvc_free_urb_buffers(stream); | |
efdc8a95 LP |
835 | break; |
836 | } | |
837 | } | |
838 | ||
839 | if (i == UVC_URBS) { | |
663a4192 LP |
840 | uvc_trace(UVC_TRACE_VIDEO, "Allocated %u URB buffers " |
841 | "of %ux%u bytes each.\n", UVC_URBS, npackets, | |
842 | psize); | |
efdc8a95 | 843 | return npackets; |
e01117c8 LP |
844 | } |
845 | } | |
846 | ||
663a4192 LP |
847 | uvc_trace(UVC_TRACE_VIDEO, "Failed to allocate URB buffers (%u bytes " |
848 | "per packet).\n", psize); | |
e01117c8 LP |
849 | return 0; |
850 | } | |
851 | ||
c0efd232 LP |
852 | /* |
853 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
854 | */ | |
35f02a68 | 855 | static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) |
c0efd232 LP |
856 | { |
857 | struct urb *urb; | |
858 | unsigned int i; | |
859 | ||
860 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
861 | urb = stream->urb[i]; |
862 | if (urb == NULL) | |
c0efd232 LP |
863 | continue; |
864 | ||
865 | usb_kill_urb(urb); | |
c0efd232 | 866 | usb_free_urb(urb); |
35f02a68 | 867 | stream->urb[i] = NULL; |
c0efd232 | 868 | } |
e01117c8 LP |
869 | |
870 | if (free_buffers) | |
35f02a68 | 871 | uvc_free_urb_buffers(stream); |
c0efd232 LP |
872 | } |
873 | ||
874 | /* | |
875 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
876 | * is given by the endpoint. | |
877 | */ | |
35f02a68 | 878 | static int uvc_init_video_isoc(struct uvc_streaming *stream, |
29135878 | 879 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
880 | { |
881 | struct urb *urb; | |
882 | unsigned int npackets, i, j; | |
efdc8a95 LP |
883 | u16 psize; |
884 | u32 size; | |
c0efd232 | 885 | |
c0efd232 LP |
886 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
887 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
35f02a68 | 888 | size = stream->ctrl.dwMaxVideoFrameSize; |
c0efd232 | 889 | |
35f02a68 | 890 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 LP |
891 | if (npackets == 0) |
892 | return -ENOMEM; | |
c0efd232 LP |
893 | |
894 | size = npackets * psize; | |
895 | ||
896 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 897 | urb = usb_alloc_urb(npackets, gfp_flags); |
c0efd232 | 898 | if (urb == NULL) { |
35f02a68 | 899 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
900 | return -ENOMEM; |
901 | } | |
902 | ||
35f02a68 LP |
903 | urb->dev = stream->dev->udev; |
904 | urb->context = stream; | |
905 | urb->pipe = usb_rcvisocpipe(stream->dev->udev, | |
c0efd232 LP |
906 | ep->desc.bEndpointAddress); |
907 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
908 | urb->interval = ep->desc.bInterval; | |
35f02a68 LP |
909 | urb->transfer_buffer = stream->urb_buffer[i]; |
910 | urb->transfer_dma = stream->urb_dma[i]; | |
c0efd232 LP |
911 | urb->complete = uvc_video_complete; |
912 | urb->number_of_packets = npackets; | |
913 | urb->transfer_buffer_length = size; | |
914 | ||
915 | for (j = 0; j < npackets; ++j) { | |
916 | urb->iso_frame_desc[j].offset = j * psize; | |
917 | urb->iso_frame_desc[j].length = psize; | |
918 | } | |
919 | ||
35f02a68 | 920 | stream->urb[i] = urb; |
c0efd232 LP |
921 | } |
922 | ||
923 | return 0; | |
924 | } | |
925 | ||
926 | /* | |
927 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
928 | * given by the endpoint. | |
929 | */ | |
35f02a68 | 930 | static int uvc_init_video_bulk(struct uvc_streaming *stream, |
29135878 | 931 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
932 | { |
933 | struct urb *urb; | |
efdc8a95 LP |
934 | unsigned int npackets, pipe, i; |
935 | u16 psize; | |
936 | u32 size; | |
937 | ||
c0efd232 | 938 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; |
35f02a68 LP |
939 | size = stream->ctrl.dwMaxPayloadTransferSize; |
940 | stream->bulk.max_payload_size = size; | |
c0efd232 | 941 | |
35f02a68 | 942 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 | 943 | if (npackets == 0) |
e01117c8 LP |
944 | return -ENOMEM; |
945 | ||
efdc8a95 LP |
946 | size = npackets * psize; |
947 | ||
ff924203 | 948 | if (usb_endpoint_dir_in(&ep->desc)) |
35f02a68 | 949 | pipe = usb_rcvbulkpipe(stream->dev->udev, |
ff924203 LP |
950 | ep->desc.bEndpointAddress); |
951 | else | |
35f02a68 | 952 | pipe = usb_sndbulkpipe(stream->dev->udev, |
ff924203 LP |
953 | ep->desc.bEndpointAddress); |
954 | ||
35f02a68 | 955 | if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) |
ff924203 | 956 | size = 0; |
c0efd232 LP |
957 | |
958 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 959 | urb = usb_alloc_urb(0, gfp_flags); |
c0efd232 | 960 | if (urb == NULL) { |
35f02a68 | 961 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
962 | return -ENOMEM; |
963 | } | |
964 | ||
35f02a68 LP |
965 | usb_fill_bulk_urb(urb, stream->dev->udev, pipe, |
966 | stream->urb_buffer[i], size, uvc_video_complete, | |
967 | stream); | |
c0efd232 | 968 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
35f02a68 | 969 | urb->transfer_dma = stream->urb_dma[i]; |
c0efd232 | 970 | |
35f02a68 | 971 | stream->urb[i] = urb; |
c0efd232 LP |
972 | } |
973 | ||
974 | return 0; | |
975 | } | |
976 | ||
977 | /* | |
978 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
979 | */ | |
35f02a68 | 980 | static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags) |
c0efd232 | 981 | { |
35f02a68 | 982 | struct usb_interface *intf = stream->intf; |
2c4d9de8 LP |
983 | struct usb_host_endpoint *ep; |
984 | unsigned int i; | |
c0efd232 LP |
985 | int ret; |
986 | ||
650b95fe | 987 | stream->sequence = -1; |
35f02a68 LP |
988 | stream->last_fid = -1; |
989 | stream->bulk.header_size = 0; | |
990 | stream->bulk.skip_payload = 0; | |
991 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
992 | |
993 | if (intf->num_altsetting > 1) { | |
2c4d9de8 LP |
994 | struct usb_host_endpoint *best_ep = NULL; |
995 | unsigned int best_psize = 3 * 1024; | |
996 | unsigned int bandwidth; | |
997 | unsigned int uninitialized_var(altsetting); | |
998 | int intfnum = stream->intfnum; | |
999 | ||
c0efd232 | 1000 | /* Isochronous endpoint, select the alternate setting. */ |
35f02a68 | 1001 | bandwidth = stream->ctrl.dwMaxPayloadTransferSize; |
c0efd232 LP |
1002 | |
1003 | if (bandwidth == 0) { | |
663a4192 LP |
1004 | uvc_trace(UVC_TRACE_VIDEO, "Device requested null " |
1005 | "bandwidth, defaulting to lowest.\n"); | |
c0efd232 | 1006 | bandwidth = 1; |
663a4192 LP |
1007 | } else { |
1008 | uvc_trace(UVC_TRACE_VIDEO, "Device requested %u " | |
1009 | "B/frame bandwidth.\n", bandwidth); | |
c0efd232 LP |
1010 | } |
1011 | ||
1012 | for (i = 0; i < intf->num_altsetting; ++i) { | |
2c4d9de8 LP |
1013 | struct usb_host_interface *alts; |
1014 | unsigned int psize; | |
1015 | ||
c0efd232 LP |
1016 | alts = &intf->altsetting[i]; |
1017 | ep = uvc_find_endpoint(alts, | |
35f02a68 | 1018 | stream->header.bEndpointAddress); |
c0efd232 LP |
1019 | if (ep == NULL) |
1020 | continue; | |
1021 | ||
1022 | /* Check if the bandwidth is high enough. */ | |
1023 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
1024 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
2c4d9de8 LP |
1025 | if (psize >= bandwidth && psize <= best_psize) { |
1026 | altsetting = i; | |
1027 | best_psize = psize; | |
1028 | best_ep = ep; | |
1029 | } | |
c0efd232 LP |
1030 | } |
1031 | ||
2c4d9de8 | 1032 | if (best_ep == NULL) { |
663a4192 LP |
1033 | uvc_trace(UVC_TRACE_VIDEO, "No fast enough alt setting " |
1034 | "for requested bandwidth.\n"); | |
c0efd232 | 1035 | return -EIO; |
663a4192 | 1036 | } |
c0efd232 | 1037 | |
2c4d9de8 LP |
1038 | uvc_trace(UVC_TRACE_VIDEO, "Selecting alternate setting %u " |
1039 | "(%u B/frame bandwidth).\n", altsetting, best_psize); | |
1040 | ||
1041 | ret = usb_set_interface(stream->dev->udev, intfnum, altsetting); | |
35f02a68 | 1042 | if (ret < 0) |
c0efd232 LP |
1043 | return ret; |
1044 | ||
2c4d9de8 | 1045 | ret = uvc_init_video_isoc(stream, best_ep, gfp_flags); |
c0efd232 LP |
1046 | } else { |
1047 | /* Bulk endpoint, proceed to URB initialization. */ | |
1048 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
35f02a68 | 1049 | stream->header.bEndpointAddress); |
c0efd232 LP |
1050 | if (ep == NULL) |
1051 | return -EIO; | |
1052 | ||
35f02a68 | 1053 | ret = uvc_init_video_bulk(stream, ep, gfp_flags); |
c0efd232 LP |
1054 | } |
1055 | ||
1056 | if (ret < 0) | |
1057 | return ret; | |
1058 | ||
1059 | /* Submit the URBs. */ | |
1060 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
1061 | ret = usb_submit_urb(stream->urb[i], gfp_flags); |
1062 | if (ret < 0) { | |
c0efd232 LP |
1063 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
1064 | "(%d).\n", i, ret); | |
35f02a68 | 1065 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
1066 | return ret; |
1067 | } | |
1068 | } | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | /* -------------------------------------------------------------------------- | |
1074 | * Suspend/resume | |
1075 | */ | |
1076 | ||
1077 | /* | |
1078 | * Stop streaming without disabling the video queue. | |
1079 | * | |
1080 | * To let userspace applications resume without trouble, we must not touch the | |
1081 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
1082 | * completion handler won't try to cancel the queue when we kill the URBs. | |
1083 | */ | |
35f02a68 | 1084 | int uvc_video_suspend(struct uvc_streaming *stream) |
c0efd232 | 1085 | { |
35f02a68 | 1086 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1087 | return 0; |
1088 | ||
35f02a68 LP |
1089 | stream->frozen = 1; |
1090 | uvc_uninit_video(stream, 0); | |
1091 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
c0efd232 LP |
1092 | return 0; |
1093 | } | |
1094 | ||
1095 | /* | |
2c2d264b | 1096 | * Reconfigure the video interface and restart streaming if it was enabled |
c0efd232 LP |
1097 | * before suspend. |
1098 | * | |
1099 | * If an error occurs, disable the video queue. This will wake all pending | |
1100 | * buffers, making sure userspace applications are notified of the problem | |
1101 | * instead of waiting forever. | |
1102 | */ | |
35f02a68 | 1103 | int uvc_video_resume(struct uvc_streaming *stream) |
c0efd232 LP |
1104 | { |
1105 | int ret; | |
1106 | ||
35f02a68 | 1107 | stream->frozen = 0; |
c0efd232 | 1108 | |
35f02a68 LP |
1109 | ret = uvc_commit_video(stream, &stream->ctrl); |
1110 | if (ret < 0) { | |
1111 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1112 | return ret; |
1113 | } | |
1114 | ||
35f02a68 | 1115 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1116 | return 0; |
1117 | ||
35f02a68 LP |
1118 | ret = uvc_init_video(stream, GFP_NOIO); |
1119 | if (ret < 0) | |
1120 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1121 | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | /* ------------------------------------------------------------------------ | |
1126 | * Video device | |
1127 | */ | |
1128 | ||
1129 | /* | |
2c2d264b LP |
1130 | * Initialize the UVC video device by switching to alternate setting 0 and |
1131 | * retrieve the default format. | |
c0efd232 LP |
1132 | * |
1133 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
1134 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
1135 | * violation, so try to silently fix the values if possible. | |
1136 | * | |
1137 | * This function is called before registering the device with V4L. | |
1138 | */ | |
35f02a68 | 1139 | int uvc_video_init(struct uvc_streaming *stream) |
c0efd232 | 1140 | { |
35f02a68 | 1141 | struct uvc_streaming_control *probe = &stream->ctrl; |
c0efd232 LP |
1142 | struct uvc_format *format = NULL; |
1143 | struct uvc_frame *frame = NULL; | |
1144 | unsigned int i; | |
1145 | int ret; | |
1146 | ||
35f02a68 | 1147 | if (stream->nformats == 0) { |
c0efd232 LP |
1148 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); |
1149 | return -EINVAL; | |
1150 | } | |
1151 | ||
35f02a68 LP |
1152 | atomic_set(&stream->active, 0); |
1153 | ||
1154 | /* Initialize the video buffers queue. */ | |
9bde9f26 | 1155 | uvc_queue_init(&stream->queue, stream->type, !uvc_no_drop_param); |
35f02a68 | 1156 | |
c0efd232 LP |
1157 | /* Alternate setting 0 should be the default, yet the XBox Live Vision |
1158 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
1159 | * they don't receive a SET_INTERFACE request before any other video | |
1160 | * control request. | |
1161 | */ | |
35f02a68 | 1162 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); |
c0efd232 | 1163 | |
72362422 LP |
1164 | /* Set the streaming probe control with default streaming parameters |
1165 | * retrieved from the device. Webcams that don't suport GET_DEF | |
1166 | * requests on the probe control will just keep their current streaming | |
1167 | * parameters. | |
c0efd232 | 1168 | */ |
35f02a68 LP |
1169 | if (uvc_get_video_ctrl(stream, probe, 1, UVC_GET_DEF) == 0) |
1170 | uvc_set_video_ctrl(stream, probe, 1); | |
72362422 LP |
1171 | |
1172 | /* Initialize the streaming parameters with the probe control current | |
1173 | * value. This makes sure SET_CUR requests on the streaming commit | |
1174 | * control will always use values retrieved from a successful GET_CUR | |
1175 | * request on the probe control, as required by the UVC specification. | |
1176 | */ | |
35f02a68 | 1177 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 1178 | if (ret < 0) |
c0efd232 LP |
1179 | return ret; |
1180 | ||
1181 | /* Check if the default format descriptor exists. Use the first | |
1182 | * available format otherwise. | |
1183 | */ | |
35f02a68 LP |
1184 | for (i = stream->nformats; i > 0; --i) { |
1185 | format = &stream->format[i-1]; | |
c0efd232 LP |
1186 | if (format->index == probe->bFormatIndex) |
1187 | break; | |
1188 | } | |
1189 | ||
1190 | if (format->nframes == 0) { | |
1191 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
1192 | "default format.\n"); | |
1193 | return -EINVAL; | |
1194 | } | |
1195 | ||
1196 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
1197 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
1198 | * descriptor with bFrameIndex set to zero. If the default frame | |
078f8947 | 1199 | * descriptor is not found, use the first available frame. |
c0efd232 LP |
1200 | */ |
1201 | for (i = format->nframes; i > 0; --i) { | |
1202 | frame = &format->frame[i-1]; | |
1203 | if (frame->bFrameIndex == probe->bFrameIndex) | |
1204 | break; | |
1205 | } | |
1206 | ||
c0efd232 LP |
1207 | probe->bFormatIndex = format->index; |
1208 | probe->bFrameIndex = frame->bFrameIndex; | |
c0efd232 | 1209 | |
35f02a68 LP |
1210 | stream->cur_format = format; |
1211 | stream->cur_frame = frame; | |
c0efd232 LP |
1212 | |
1213 | /* Select the video decoding function */ | |
35f02a68 LP |
1214 | if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { |
1215 | if (stream->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
1216 | stream->decode = uvc_video_decode_isight; | |
1217 | else if (stream->intf->num_altsetting > 1) | |
1218 | stream->decode = uvc_video_decode_isoc; | |
ff924203 | 1219 | else |
35f02a68 | 1220 | stream->decode = uvc_video_decode_bulk; |
ff924203 | 1221 | } else { |
35f02a68 LP |
1222 | if (stream->intf->num_altsetting == 1) |
1223 | stream->decode = uvc_video_encode_bulk; | |
ff924203 LP |
1224 | else { |
1225 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | |
1226 | "supported for video output devices.\n"); | |
1227 | return -EINVAL; | |
1228 | } | |
1229 | } | |
c0efd232 LP |
1230 | |
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Enable or disable the video stream. | |
1236 | */ | |
35f02a68 | 1237 | int uvc_video_enable(struct uvc_streaming *stream, int enable) |
c0efd232 LP |
1238 | { |
1239 | int ret; | |
1240 | ||
1241 | if (!enable) { | |
35f02a68 LP |
1242 | uvc_uninit_video(stream, 1); |
1243 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1244 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1245 | return 0; |
1246 | } | |
1247 | ||
35f02a68 LP |
1248 | ret = uvc_queue_enable(&stream->queue, 1); |
1249 | if (ret < 0) | |
c0efd232 LP |
1250 | return ret; |
1251 | ||
23867b25 | 1252 | /* Commit the streaming parameters. */ |
35f02a68 LP |
1253 | ret = uvc_commit_video(stream, &stream->ctrl); |
1254 | if (ret < 0) | |
23867b25 LP |
1255 | return ret; |
1256 | ||
35f02a68 | 1257 | return uvc_init_video(stream, GFP_KERNEL); |
c0efd232 | 1258 | } |
f87086e3 | 1259 |