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Commit | Line | Data |
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c0efd232 LP |
1 | /* |
2 | * uvc_video.c -- USB Video Class driver - Video handling | |
3 | * | |
2c2d264b | 4 | * Copyright (C) 2005-2009 |
c0efd232 LP |
5 | * Laurent Pinchart (laurent.pinchart@skynet.be) |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
c0efd232 LP |
15 | #include <linux/list.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/usb.h> | |
18 | #include <linux/videodev2.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/wait.h> | |
21 | #include <asm/atomic.h> | |
22 | #include <asm/unaligned.h> | |
23 | ||
24 | #include <media/v4l2-common.h> | |
25 | ||
26 | #include "uvcvideo.h" | |
27 | ||
28 | /* ------------------------------------------------------------------------ | |
29 | * UVC Controls | |
30 | */ | |
31 | ||
32 | static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, | |
33 | __u8 intfnum, __u8 cs, void *data, __u16 size, | |
34 | int timeout) | |
35 | { | |
36 | __u8 type = USB_TYPE_CLASS | USB_RECIP_INTERFACE; | |
37 | unsigned int pipe; | |
c0efd232 LP |
38 | |
39 | pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0) | |
40 | : usb_sndctrlpipe(dev->udev, 0); | |
41 | type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT; | |
42 | ||
44f0079e | 43 | return usb_control_msg(dev->udev, pipe, query, type, cs << 8, |
c0efd232 | 44 | unit << 8 | intfnum, data, size, timeout); |
44f0079e LP |
45 | } |
46 | ||
47 | int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, | |
48 | __u8 intfnum, __u8 cs, void *data, __u16 size) | |
49 | { | |
50 | int ret; | |
c0efd232 | 51 | |
44f0079e LP |
52 | ret = __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, |
53 | UVC_CTRL_CONTROL_TIMEOUT); | |
c0efd232 LP |
54 | if (ret != size) { |
55 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u " | |
56 | "(unit %u) : %d (exp. %u).\n", query, cs, unit, ret, | |
57 | size); | |
58 | return -EIO; | |
59 | } | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
50144aee | 64 | static void uvc_fixup_video_ctrl(struct uvc_video_device *video, |
c0efd232 LP |
65 | struct uvc_streaming_control *ctrl) |
66 | { | |
67 | struct uvc_format *format; | |
078f8947 LP |
68 | struct uvc_frame *frame = NULL; |
69 | unsigned int i; | |
c0efd232 LP |
70 | |
71 | if (ctrl->bFormatIndex <= 0 || | |
72 | ctrl->bFormatIndex > video->streaming->nformats) | |
73 | return; | |
74 | ||
75 | format = &video->streaming->format[ctrl->bFormatIndex - 1]; | |
76 | ||
078f8947 LP |
77 | for (i = 0; i < format->nframes; ++i) { |
78 | if (format->frame[i].bFrameIndex == ctrl->bFrameIndex) { | |
79 | frame = &format->frame[i]; | |
80 | break; | |
81 | } | |
82 | } | |
c0efd232 | 83 | |
078f8947 LP |
84 | if (frame == NULL) |
85 | return; | |
c0efd232 LP |
86 | |
87 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || | |
88 | (ctrl->dwMaxVideoFrameSize == 0 && | |
89 | video->dev->uvc_version < 0x0110)) | |
90 | ctrl->dwMaxVideoFrameSize = | |
91 | frame->dwMaxVideoFrameBufferSize; | |
50144aee LP |
92 | |
93 | if (video->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH && | |
94 | video->streaming->intf->num_altsetting > 1) { | |
95 | u32 interval; | |
96 | u32 bandwidth; | |
97 | ||
98 | interval = (ctrl->dwFrameInterval > 100000) | |
99 | ? ctrl->dwFrameInterval | |
100 | : frame->dwFrameInterval[0]; | |
101 | ||
102 | /* Compute a bandwidth estimation by multiplying the frame | |
103 | * size by the number of video frames per second, divide the | |
104 | * result by the number of USB frames (or micro-frames for | |
105 | * high-speed devices) per second and add the UVC header size | |
106 | * (assumed to be 12 bytes long). | |
107 | */ | |
108 | bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp; | |
109 | bandwidth *= 10000000 / interval + 1; | |
110 | bandwidth /= 1000; | |
111 | if (video->dev->udev->speed == USB_SPEED_HIGH) | |
112 | bandwidth /= 8; | |
113 | bandwidth += 12; | |
114 | ||
115 | ctrl->dwMaxPayloadTransferSize = bandwidth; | |
116 | } | |
c0efd232 LP |
117 | } |
118 | ||
119 | static int uvc_get_video_ctrl(struct uvc_video_device *video, | |
120 | struct uvc_streaming_control *ctrl, int probe, __u8 query) | |
121 | { | |
04793dd0 LP |
122 | __u8 *data; |
123 | __u16 size; | |
c0efd232 LP |
124 | int ret; |
125 | ||
126 | size = video->dev->uvc_version >= 0x0110 ? 34 : 26; | |
04793dd0 LP |
127 | data = kmalloc(size, GFP_KERNEL); |
128 | if (data == NULL) | |
129 | return -ENOMEM; | |
130 | ||
c0efd232 | 131 | ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum, |
04793dd0 | 132 | probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size, |
c0efd232 | 133 | UVC_CTRL_STREAMING_TIMEOUT); |
44f0079e LP |
134 | |
135 | if ((query == GET_MIN || query == GET_MAX) && ret == 2) { | |
136 | /* Some cameras, mostly based on Bison Electronics chipsets, | |
137 | * answer a GET_MIN or GET_MAX request with the wCompQuality | |
138 | * field only. | |
139 | */ | |
140 | uvc_warn_once(video->dev, UVC_WARN_MINMAX, "UVC non " | |
141 | "compliance - GET_MIN/MAX(PROBE) incorrectly " | |
142 | "supported. Enabling workaround.\n"); | |
143 | memset(ctrl, 0, sizeof ctrl); | |
144 | ctrl->wCompQuality = le16_to_cpup((__le16 *)data); | |
145 | ret = 0; | |
04793dd0 | 146 | goto out; |
51cac8ad | 147 | } else if (query == GET_DEF && probe == 1 && ret != size) { |
44f0079e LP |
148 | /* Many cameras don't support the GET_DEF request on their |
149 | * video probe control. Warn once and return, the caller will | |
150 | * fall back to GET_CUR. | |
151 | */ | |
152 | uvc_warn_once(video->dev, UVC_WARN_PROBE_DEF, "UVC non " | |
153 | "compliance - GET_DEF(PROBE) not supported. " | |
154 | "Enabling workaround.\n"); | |
155 | ret = -EIO; | |
156 | goto out; | |
157 | } else if (ret != size) { | |
158 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : " | |
159 | "%d (exp. %u).\n", query, probe ? "probe" : "commit", | |
160 | ret, size); | |
161 | ret = -EIO; | |
162 | goto out; | |
163 | } | |
c0efd232 LP |
164 | |
165 | ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); | |
166 | ctrl->bFormatIndex = data[2]; | |
167 | ctrl->bFrameIndex = data[3]; | |
168 | ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]); | |
169 | ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]); | |
170 | ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]); | |
171 | ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]); | |
172 | ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]); | |
173 | ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]); | |
4d3939f6 LP |
174 | ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]); |
175 | ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]); | |
c0efd232 LP |
176 | |
177 | if (size == 34) { | |
4d3939f6 | 178 | ctrl->dwClockFrequency = get_unaligned_le32(&data[26]); |
c0efd232 LP |
179 | ctrl->bmFramingInfo = data[30]; |
180 | ctrl->bPreferedVersion = data[31]; | |
181 | ctrl->bMinVersion = data[32]; | |
182 | ctrl->bMaxVersion = data[33]; | |
183 | } else { | |
184 | ctrl->dwClockFrequency = video->dev->clock_frequency; | |
185 | ctrl->bmFramingInfo = 0; | |
186 | ctrl->bPreferedVersion = 0; | |
187 | ctrl->bMinVersion = 0; | |
188 | ctrl->bMaxVersion = 0; | |
189 | } | |
190 | ||
50144aee LP |
191 | /* Some broken devices return null or wrong dwMaxVideoFrameSize and |
192 | * dwMaxPayloadTransferSize fields. Try to get the value from the | |
193 | * format and frame descriptors. | |
c0efd232 | 194 | */ |
50144aee | 195 | uvc_fixup_video_ctrl(video, ctrl); |
44f0079e | 196 | ret = 0; |
c0efd232 | 197 | |
04793dd0 LP |
198 | out: |
199 | kfree(data); | |
200 | return ret; | |
c0efd232 LP |
201 | } |
202 | ||
44f0079e | 203 | static int uvc_set_video_ctrl(struct uvc_video_device *video, |
c0efd232 LP |
204 | struct uvc_streaming_control *ctrl, int probe) |
205 | { | |
04793dd0 LP |
206 | __u8 *data; |
207 | __u16 size; | |
208 | int ret; | |
c0efd232 LP |
209 | |
210 | size = video->dev->uvc_version >= 0x0110 ? 34 : 26; | |
04793dd0 LP |
211 | data = kzalloc(size, GFP_KERNEL); |
212 | if (data == NULL) | |
213 | return -ENOMEM; | |
c0efd232 LP |
214 | |
215 | *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint); | |
216 | data[2] = ctrl->bFormatIndex; | |
217 | data[3] = ctrl->bFrameIndex; | |
218 | *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval); | |
219 | *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate); | |
220 | *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate); | |
221 | *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality); | |
222 | *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize); | |
223 | *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay); | |
4d3939f6 LP |
224 | put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]); |
225 | put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]); | |
c0efd232 LP |
226 | |
227 | if (size == 34) { | |
4d3939f6 | 228 | put_unaligned_le32(ctrl->dwClockFrequency, &data[26]); |
c0efd232 LP |
229 | data[30] = ctrl->bmFramingInfo; |
230 | data[31] = ctrl->bPreferedVersion; | |
231 | data[32] = ctrl->bMinVersion; | |
232 | data[33] = ctrl->bMaxVersion; | |
233 | } | |
234 | ||
04793dd0 | 235 | ret = __uvc_query_ctrl(video->dev, SET_CUR, 0, |
c0efd232 | 236 | video->streaming->intfnum, |
04793dd0 | 237 | probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size, |
c0efd232 | 238 | UVC_CTRL_STREAMING_TIMEOUT); |
44f0079e LP |
239 | if (ret != size) { |
240 | uvc_printk(KERN_ERR, "Failed to set UVC %s control : " | |
241 | "%d (exp. %u).\n", probe ? "probe" : "commit", | |
242 | ret, size); | |
243 | ret = -EIO; | |
244 | } | |
04793dd0 LP |
245 | |
246 | kfree(data); | |
247 | return ret; | |
c0efd232 LP |
248 | } |
249 | ||
250 | int uvc_probe_video(struct uvc_video_device *video, | |
251 | struct uvc_streaming_control *probe) | |
252 | { | |
253 | struct uvc_streaming_control probe_min, probe_max; | |
254 | __u16 bandwidth; | |
255 | unsigned int i; | |
256 | int ret; | |
257 | ||
258 | mutex_lock(&video->streaming->mutex); | |
259 | ||
260 | /* Perform probing. The device should adjust the requested values | |
261 | * according to its capabilities. However, some devices, namely the | |
262 | * first generation UVC Logitech webcams, don't implement the Video | |
263 | * Probe control properly, and just return the needed bandwidth. For | |
264 | * that reason, if the needed bandwidth exceeds the maximum available | |
265 | * bandwidth, try to lower the quality. | |
266 | */ | |
267 | if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0) | |
268 | goto done; | |
269 | ||
270 | /* Get the minimum and maximum values for compression settings. */ | |
271 | if (!(video->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { | |
272 | ret = uvc_get_video_ctrl(video, &probe_min, 1, GET_MIN); | |
273 | if (ret < 0) | |
274 | goto done; | |
275 | ret = uvc_get_video_ctrl(video, &probe_max, 1, GET_MAX); | |
276 | if (ret < 0) | |
277 | goto done; | |
278 | ||
279 | probe->wCompQuality = probe_max.wCompQuality; | |
280 | } | |
281 | ||
282 | for (i = 0; i < 2; ++i) { | |
283 | if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0 || | |
284 | (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) | |
285 | goto done; | |
286 | ||
287 | if (video->streaming->intf->num_altsetting == 1) | |
288 | break; | |
289 | ||
290 | bandwidth = probe->dwMaxPayloadTransferSize; | |
291 | if (bandwidth <= video->streaming->maxpsize) | |
292 | break; | |
293 | ||
294 | if (video->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { | |
295 | ret = -ENOSPC; | |
296 | goto done; | |
297 | } | |
298 | ||
299 | /* TODO: negotiate compression parameters */ | |
300 | probe->wKeyFrameRate = probe_min.wKeyFrameRate; | |
301 | probe->wPFrameRate = probe_min.wPFrameRate; | |
302 | probe->wCompQuality = probe_max.wCompQuality; | |
303 | probe->wCompWindowSize = probe_min.wCompWindowSize; | |
304 | } | |
305 | ||
306 | done: | |
307 | mutex_unlock(&video->streaming->mutex); | |
308 | return ret; | |
309 | } | |
310 | ||
44f0079e LP |
311 | int uvc_commit_video(struct uvc_video_device *video, |
312 | struct uvc_streaming_control *probe) | |
313 | { | |
314 | return uvc_set_video_ctrl(video, probe, 0); | |
315 | } | |
316 | ||
c0efd232 LP |
317 | /* ------------------------------------------------------------------------ |
318 | * Video codecs | |
319 | */ | |
320 | ||
321 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ | |
322 | #define UVC_STREAM_EOH (1 << 7) | |
323 | #define UVC_STREAM_ERR (1 << 6) | |
324 | #define UVC_STREAM_STI (1 << 5) | |
325 | #define UVC_STREAM_RES (1 << 4) | |
326 | #define UVC_STREAM_SCR (1 << 3) | |
327 | #define UVC_STREAM_PTS (1 << 2) | |
328 | #define UVC_STREAM_EOF (1 << 1) | |
329 | #define UVC_STREAM_FID (1 << 0) | |
330 | ||
331 | /* Video payload decoding is handled by uvc_video_decode_start(), | |
332 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
333 | * | |
334 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
335 | * isochronous payload. It processes header data and returns the header size | |
336 | * in bytes if successful. If an error occurs, it returns a negative error | |
337 | * code. The following error codes have special meanings. | |
338 | * | |
339 | * - EAGAIN informs the caller that the current video buffer should be marked | |
340 | * as done, and that the function should be called again with the same data | |
341 | * and a new video buffer. This is used when end of frame conditions can be | |
342 | * reliably detected at the beginning of the next frame only. | |
343 | * | |
344 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
345 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
346 | * made until the next payload. -ENODATA can be used to drop the current | |
347 | * payload if no other error code is appropriate. | |
348 | * | |
349 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
350 | * data to the video buffer. | |
351 | * | |
352 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
353 | * isochronous payload. It performs any additional header data processing and | |
354 | * returns 0 or a negative error code if an error occured. As header data have | |
355 | * already been processed by uvc_video_decode_start, this functions isn't | |
356 | * required to perform sanity checks a second time. | |
357 | * | |
358 | * For isochronous transfers where a payload is always transfered in a single | |
359 | * URB, the three functions will be called in a row. | |
360 | * | |
361 | * To let the decoder process header data and update its internal state even | |
362 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
363 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
364 | * uvc_video_decode_end will never be called with a NULL buffer. | |
365 | */ | |
366 | static int uvc_video_decode_start(struct uvc_video_device *video, | |
367 | struct uvc_buffer *buf, const __u8 *data, int len) | |
368 | { | |
369 | __u8 fid; | |
370 | ||
371 | /* Sanity checks: | |
372 | * - packet must be at least 2 bytes long | |
373 | * - bHeaderLength value must be at least 2 bytes (see above) | |
374 | * - bHeaderLength value can't be larger than the packet size. | |
375 | */ | |
376 | if (len < 2 || data[0] < 2 || data[0] > len) | |
377 | return -EINVAL; | |
378 | ||
379 | /* Skip payloads marked with the error bit ("error frames"). */ | |
380 | if (data[1] & UVC_STREAM_ERR) { | |
381 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | |
382 | "set).\n"); | |
383 | return -ENODATA; | |
384 | } | |
385 | ||
386 | fid = data[1] & UVC_STREAM_FID; | |
387 | ||
388 | /* Store the payload FID bit and return immediately when the buffer is | |
389 | * NULL. | |
390 | */ | |
391 | if (buf == NULL) { | |
392 | video->last_fid = fid; | |
393 | return -ENODATA; | |
394 | } | |
395 | ||
396 | /* Synchronize to the input stream by waiting for the FID bit to be | |
397 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
f8dd4af6 | 398 | * video->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
399 | * frame will always be in sync. |
400 | * | |
401 | * If the device doesn't toggle the FID bit, invert video->last_fid | |
402 | * when the EOF bit is set to force synchronisation on the next packet. | |
403 | */ | |
404 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
405 | if (fid == video->last_fid) { | |
406 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " | |
407 | "sync).\n"); | |
408 | if ((video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && | |
409 | (data[1] & UVC_STREAM_EOF)) | |
410 | video->last_fid ^= UVC_STREAM_FID; | |
411 | return -ENODATA; | |
412 | } | |
413 | ||
414 | /* TODO: Handle PTS and SCR. */ | |
415 | buf->state = UVC_BUF_STATE_ACTIVE; | |
416 | } | |
417 | ||
418 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
419 | * End of frame detection is better implemented by checking the EOF | |
420 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
421 | * bit), but some devices don't set the bit at end of frame (and the | |
422 | * last payload can be lost anyway). We thus must check if the FID has | |
423 | * been toggled. | |
424 | * | |
f8dd4af6 | 425 | * video->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
426 | * frame will never trigger an end of frame detection. |
427 | * | |
428 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
429 | * as it doesn't make sense to return an empty buffer. This also | |
2c2d264b | 430 | * avoids detecting end of frame conditions at FID toggling if the |
c0efd232 LP |
431 | * previous payload had the EOF bit set. |
432 | */ | |
433 | if (fid != video->last_fid && buf->buf.bytesused != 0) { | |
434 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " | |
435 | "toggled).\n"); | |
436 | buf->state = UVC_BUF_STATE_DONE; | |
437 | return -EAGAIN; | |
438 | } | |
439 | ||
440 | video->last_fid = fid; | |
441 | ||
442 | return data[0]; | |
443 | } | |
444 | ||
445 | static void uvc_video_decode_data(struct uvc_video_device *video, | |
446 | struct uvc_buffer *buf, const __u8 *data, int len) | |
447 | { | |
448 | struct uvc_video_queue *queue = &video->queue; | |
449 | unsigned int maxlen, nbytes; | |
450 | void *mem; | |
451 | ||
452 | if (len <= 0) | |
453 | return; | |
454 | ||
455 | /* Copy the video data to the buffer. */ | |
456 | maxlen = buf->buf.length - buf->buf.bytesused; | |
457 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; | |
458 | nbytes = min((unsigned int)len, maxlen); | |
459 | memcpy(mem, data, nbytes); | |
460 | buf->buf.bytesused += nbytes; | |
461 | ||
462 | /* Complete the current frame if the buffer size was exceeded. */ | |
463 | if (len > maxlen) { | |
464 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
465 | buf->state = UVC_BUF_STATE_DONE; | |
466 | } | |
467 | } | |
468 | ||
469 | static void uvc_video_decode_end(struct uvc_video_device *video, | |
470 | struct uvc_buffer *buf, const __u8 *data, int len) | |
471 | { | |
472 | /* Mark the buffer as done if the EOF marker is set. */ | |
473 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { | |
474 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); | |
475 | if (data[0] == len) | |
476 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
477 | buf->state = UVC_BUF_STATE_DONE; | |
478 | if (video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) | |
479 | video->last_fid ^= UVC_STREAM_FID; | |
480 | } | |
481 | } | |
482 | ||
2c2d264b LP |
483 | /* Video payload encoding is handled by uvc_video_encode_header() and |
484 | * uvc_video_encode_data(). Only bulk transfers are currently supported. | |
485 | * | |
486 | * uvc_video_encode_header is called at the start of a payload. It adds header | |
487 | * data to the transfer buffer and returns the header size. As the only known | |
488 | * UVC output device transfers a whole frame in a single payload, the EOF bit | |
489 | * is always set in the header. | |
490 | * | |
491 | * uvc_video_encode_data is called for every URB and copies the data from the | |
492 | * video buffer to the transfer buffer. | |
493 | */ | |
ff924203 LP |
494 | static int uvc_video_encode_header(struct uvc_video_device *video, |
495 | struct uvc_buffer *buf, __u8 *data, int len) | |
496 | { | |
497 | data[0] = 2; /* Header length */ | |
498 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | |
499 | | (video->last_fid & UVC_STREAM_FID); | |
500 | return 2; | |
501 | } | |
502 | ||
503 | static int uvc_video_encode_data(struct uvc_video_device *video, | |
504 | struct uvc_buffer *buf, __u8 *data, int len) | |
505 | { | |
506 | struct uvc_video_queue *queue = &video->queue; | |
507 | unsigned int nbytes; | |
508 | void *mem; | |
509 | ||
510 | /* Copy video data to the URB buffer. */ | |
511 | mem = queue->mem + buf->buf.m.offset + queue->buf_used; | |
512 | nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used); | |
513 | nbytes = min(video->bulk.max_payload_size - video->bulk.payload_size, | |
514 | nbytes); | |
515 | memcpy(data, mem, nbytes); | |
516 | ||
517 | queue->buf_used += nbytes; | |
518 | ||
519 | return nbytes; | |
520 | } | |
521 | ||
c0efd232 LP |
522 | /* ------------------------------------------------------------------------ |
523 | * URB handling | |
524 | */ | |
525 | ||
526 | /* | |
527 | * Completion handler for video URBs. | |
528 | */ | |
529 | static void uvc_video_decode_isoc(struct urb *urb, | |
530 | struct uvc_video_device *video, struct uvc_buffer *buf) | |
531 | { | |
532 | u8 *mem; | |
533 | int ret, i; | |
534 | ||
535 | for (i = 0; i < urb->number_of_packets; ++i) { | |
536 | if (urb->iso_frame_desc[i].status < 0) { | |
537 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
538 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
539 | continue; | |
540 | } | |
541 | ||
542 | /* Decode the payload header. */ | |
543 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
544 | do { | |
545 | ret = uvc_video_decode_start(video, buf, mem, | |
546 | urb->iso_frame_desc[i].actual_length); | |
547 | if (ret == -EAGAIN) | |
548 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
549 | } while (ret == -EAGAIN); | |
550 | ||
551 | if (ret < 0) | |
552 | continue; | |
553 | ||
554 | /* Decode the payload data. */ | |
555 | uvc_video_decode_data(video, buf, mem + ret, | |
556 | urb->iso_frame_desc[i].actual_length - ret); | |
557 | ||
558 | /* Process the header again. */ | |
08ebd003 LP |
559 | uvc_video_decode_end(video, buf, mem, |
560 | urb->iso_frame_desc[i].actual_length); | |
c0efd232 LP |
561 | |
562 | if (buf->state == UVC_BUF_STATE_DONE || | |
563 | buf->state == UVC_BUF_STATE_ERROR) | |
564 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
565 | } | |
566 | } | |
567 | ||
568 | static void uvc_video_decode_bulk(struct urb *urb, | |
569 | struct uvc_video_device *video, struct uvc_buffer *buf) | |
570 | { | |
571 | u8 *mem; | |
572 | int len, ret; | |
573 | ||
c90e7779 LP |
574 | if (urb->actual_length == 0) |
575 | return; | |
576 | ||
c0efd232 LP |
577 | mem = urb->transfer_buffer; |
578 | len = urb->actual_length; | |
579 | video->bulk.payload_size += len; | |
580 | ||
581 | /* If the URB is the first of its payload, decode and save the | |
582 | * header. | |
583 | */ | |
f8dd4af6 | 584 | if (video->bulk.header_size == 0 && !video->bulk.skip_payload) { |
c0efd232 LP |
585 | do { |
586 | ret = uvc_video_decode_start(video, buf, mem, len); | |
587 | if (ret == -EAGAIN) | |
588 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
589 | } while (ret == -EAGAIN); | |
590 | ||
591 | /* If an error occured skip the rest of the payload. */ | |
592 | if (ret < 0 || buf == NULL) { | |
593 | video->bulk.skip_payload = 1; | |
f8dd4af6 LP |
594 | } else { |
595 | memcpy(video->bulk.header, mem, ret); | |
596 | video->bulk.header_size = ret; | |
c0efd232 | 597 | |
f8dd4af6 LP |
598 | mem += ret; |
599 | len -= ret; | |
600 | } | |
c0efd232 LP |
601 | } |
602 | ||
603 | /* The buffer queue might have been cancelled while a bulk transfer | |
604 | * was in progress, so we can reach here with buf equal to NULL. Make | |
605 | * sure buf is never dereferenced if NULL. | |
606 | */ | |
607 | ||
608 | /* Process video data. */ | |
609 | if (!video->bulk.skip_payload && buf != NULL) | |
610 | uvc_video_decode_data(video, buf, mem, len); | |
611 | ||
612 | /* Detect the payload end by a URB smaller than the maximum size (or | |
613 | * a payload size equal to the maximum) and process the header again. | |
614 | */ | |
615 | if (urb->actual_length < urb->transfer_buffer_length || | |
616 | video->bulk.payload_size >= video->bulk.max_payload_size) { | |
617 | if (!video->bulk.skip_payload && buf != NULL) { | |
618 | uvc_video_decode_end(video, buf, video->bulk.header, | |
08ebd003 | 619 | video->bulk.payload_size); |
c0efd232 LP |
620 | if (buf->state == UVC_BUF_STATE_DONE || |
621 | buf->state == UVC_BUF_STATE_ERROR) | |
622 | buf = uvc_queue_next_buffer(&video->queue, buf); | |
623 | } | |
624 | ||
625 | video->bulk.header_size = 0; | |
626 | video->bulk.skip_payload = 0; | |
627 | video->bulk.payload_size = 0; | |
628 | } | |
629 | } | |
630 | ||
ff924203 LP |
631 | static void uvc_video_encode_bulk(struct urb *urb, |
632 | struct uvc_video_device *video, struct uvc_buffer *buf) | |
633 | { | |
634 | u8 *mem = urb->transfer_buffer; | |
635 | int len = video->urb_size, ret; | |
636 | ||
637 | if (buf == NULL) { | |
638 | urb->transfer_buffer_length = 0; | |
639 | return; | |
640 | } | |
641 | ||
642 | /* If the URB is the first of its payload, add the header. */ | |
643 | if (video->bulk.header_size == 0) { | |
644 | ret = uvc_video_encode_header(video, buf, mem, len); | |
645 | video->bulk.header_size = ret; | |
646 | video->bulk.payload_size += ret; | |
647 | mem += ret; | |
648 | len -= ret; | |
649 | } | |
650 | ||
651 | /* Process video data. */ | |
652 | ret = uvc_video_encode_data(video, buf, mem, len); | |
653 | ||
654 | video->bulk.payload_size += ret; | |
655 | len -= ret; | |
656 | ||
657 | if (buf->buf.bytesused == video->queue.buf_used || | |
658 | video->bulk.payload_size == video->bulk.max_payload_size) { | |
659 | if (buf->buf.bytesused == video->queue.buf_used) { | |
660 | video->queue.buf_used = 0; | |
661 | buf->state = UVC_BUF_STATE_DONE; | |
662 | uvc_queue_next_buffer(&video->queue, buf); | |
663 | video->last_fid ^= UVC_STREAM_FID; | |
664 | } | |
665 | ||
666 | video->bulk.header_size = 0; | |
667 | video->bulk.payload_size = 0; | |
668 | } | |
669 | ||
670 | urb->transfer_buffer_length = video->urb_size - len; | |
671 | } | |
672 | ||
c0efd232 LP |
673 | static void uvc_video_complete(struct urb *urb) |
674 | { | |
675 | struct uvc_video_device *video = urb->context; | |
676 | struct uvc_video_queue *queue = &video->queue; | |
677 | struct uvc_buffer *buf = NULL; | |
678 | unsigned long flags; | |
679 | int ret; | |
680 | ||
681 | switch (urb->status) { | |
682 | case 0: | |
683 | break; | |
684 | ||
685 | default: | |
686 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
687 | "completion handler.\n", urb->status); | |
688 | ||
689 | case -ENOENT: /* usb_kill_urb() called. */ | |
690 | if (video->frozen) | |
691 | return; | |
692 | ||
693 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
694 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
695 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
696 | return; | |
697 | } | |
698 | ||
699 | spin_lock_irqsave(&queue->irqlock, flags); | |
700 | if (!list_empty(&queue->irqqueue)) | |
701 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
702 | queue); | |
703 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
704 | ||
705 | video->decode(urb, video, buf); | |
706 | ||
707 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
708 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
709 | ret); | |
710 | } | |
711 | } | |
712 | ||
e01117c8 LP |
713 | /* |
714 | * Free transfer buffers. | |
715 | */ | |
716 | static void uvc_free_urb_buffers(struct uvc_video_device *video) | |
717 | { | |
718 | unsigned int i; | |
719 | ||
720 | for (i = 0; i < UVC_URBS; ++i) { | |
721 | if (video->urb_buffer[i]) { | |
722 | usb_buffer_free(video->dev->udev, video->urb_size, | |
723 | video->urb_buffer[i], video->urb_dma[i]); | |
724 | video->urb_buffer[i] = NULL; | |
725 | } | |
726 | } | |
727 | ||
728 | video->urb_size = 0; | |
729 | } | |
730 | ||
731 | /* | |
732 | * Allocate transfer buffers. This function can be called with buffers | |
733 | * already allocated when resuming from suspend, in which case it will | |
734 | * return without touching the buffers. | |
735 | * | |
efdc8a95 LP |
736 | * Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the |
737 | * system is too low on memory try successively smaller numbers of packets | |
738 | * until allocation succeeds. | |
739 | * | |
740 | * Return the number of allocated packets on success or 0 when out of memory. | |
e01117c8 LP |
741 | */ |
742 | static int uvc_alloc_urb_buffers(struct uvc_video_device *video, | |
efdc8a95 | 743 | unsigned int size, unsigned int psize, gfp_t gfp_flags) |
e01117c8 | 744 | { |
efdc8a95 | 745 | unsigned int npackets; |
e01117c8 LP |
746 | unsigned int i; |
747 | ||
748 | /* Buffers are already allocated, bail out. */ | |
749 | if (video->urb_size) | |
cb1287a8 | 750 | return video->urb_size / psize; |
e01117c8 | 751 | |
efdc8a95 LP |
752 | /* Compute the number of packets. Bulk endpoints might transfer UVC |
753 | * payloads accross multiple URBs. | |
754 | */ | |
755 | npackets = DIV_ROUND_UP(size, psize); | |
756 | if (npackets > UVC_MAX_PACKETS) | |
757 | npackets = UVC_MAX_PACKETS; | |
758 | ||
759 | /* Retry allocations until one succeed. */ | |
760 | for (; npackets > 1; npackets /= 2) { | |
761 | for (i = 0; i < UVC_URBS; ++i) { | |
762 | video->urb_buffer[i] = usb_buffer_alloc( | |
763 | video->dev->udev, psize * npackets, | |
764 | gfp_flags | __GFP_NOWARN, &video->urb_dma[i]); | |
765 | if (!video->urb_buffer[i]) { | |
766 | uvc_free_urb_buffers(video); | |
767 | break; | |
768 | } | |
769 | } | |
770 | ||
771 | if (i == UVC_URBS) { | |
772 | video->urb_size = psize * npackets; | |
773 | return npackets; | |
e01117c8 LP |
774 | } |
775 | } | |
776 | ||
e01117c8 LP |
777 | return 0; |
778 | } | |
779 | ||
c0efd232 LP |
780 | /* |
781 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
782 | */ | |
e01117c8 | 783 | static void uvc_uninit_video(struct uvc_video_device *video, int free_buffers) |
c0efd232 LP |
784 | { |
785 | struct urb *urb; | |
786 | unsigned int i; | |
787 | ||
788 | for (i = 0; i < UVC_URBS; ++i) { | |
789 | if ((urb = video->urb[i]) == NULL) | |
790 | continue; | |
791 | ||
792 | usb_kill_urb(urb); | |
c0efd232 LP |
793 | usb_free_urb(urb); |
794 | video->urb[i] = NULL; | |
795 | } | |
e01117c8 LP |
796 | |
797 | if (free_buffers) | |
798 | uvc_free_urb_buffers(video); | |
c0efd232 LP |
799 | } |
800 | ||
801 | /* | |
802 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
803 | * is given by the endpoint. | |
804 | */ | |
805 | static int uvc_init_video_isoc(struct uvc_video_device *video, | |
29135878 | 806 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
807 | { |
808 | struct urb *urb; | |
809 | unsigned int npackets, i, j; | |
efdc8a95 LP |
810 | u16 psize; |
811 | u32 size; | |
c0efd232 | 812 | |
c0efd232 LP |
813 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
814 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
c0efd232 | 815 | size = video->streaming->ctrl.dwMaxVideoFrameSize; |
c0efd232 | 816 | |
efdc8a95 LP |
817 | npackets = uvc_alloc_urb_buffers(video, size, psize, gfp_flags); |
818 | if (npackets == 0) | |
819 | return -ENOMEM; | |
c0efd232 LP |
820 | |
821 | size = npackets * psize; | |
822 | ||
823 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 824 | urb = usb_alloc_urb(npackets, gfp_flags); |
c0efd232 | 825 | if (urb == NULL) { |
e01117c8 | 826 | uvc_uninit_video(video, 1); |
c0efd232 LP |
827 | return -ENOMEM; |
828 | } | |
829 | ||
830 | urb->dev = video->dev->udev; | |
831 | urb->context = video; | |
832 | urb->pipe = usb_rcvisocpipe(video->dev->udev, | |
833 | ep->desc.bEndpointAddress); | |
834 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
835 | urb->interval = ep->desc.bInterval; | |
836 | urb->transfer_buffer = video->urb_buffer[i]; | |
e01117c8 | 837 | urb->transfer_dma = video->urb_dma[i]; |
c0efd232 LP |
838 | urb->complete = uvc_video_complete; |
839 | urb->number_of_packets = npackets; | |
840 | urb->transfer_buffer_length = size; | |
841 | ||
842 | for (j = 0; j < npackets; ++j) { | |
843 | urb->iso_frame_desc[j].offset = j * psize; | |
844 | urb->iso_frame_desc[j].length = psize; | |
845 | } | |
846 | ||
847 | video->urb[i] = urb; | |
848 | } | |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
853 | /* | |
854 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
855 | * given by the endpoint. | |
856 | */ | |
857 | static int uvc_init_video_bulk(struct uvc_video_device *video, | |
29135878 | 858 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
859 | { |
860 | struct urb *urb; | |
efdc8a95 LP |
861 | unsigned int npackets, pipe, i; |
862 | u16 psize; | |
863 | u32 size; | |
864 | ||
c0efd232 LP |
865 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; |
866 | size = video->streaming->ctrl.dwMaxPayloadTransferSize; | |
867 | video->bulk.max_payload_size = size; | |
c0efd232 | 868 | |
efdc8a95 LP |
869 | npackets = uvc_alloc_urb_buffers(video, size, psize, gfp_flags); |
870 | if (npackets == 0) | |
e01117c8 LP |
871 | return -ENOMEM; |
872 | ||
efdc8a95 LP |
873 | size = npackets * psize; |
874 | ||
ff924203 LP |
875 | if (usb_endpoint_dir_in(&ep->desc)) |
876 | pipe = usb_rcvbulkpipe(video->dev->udev, | |
877 | ep->desc.bEndpointAddress); | |
878 | else | |
879 | pipe = usb_sndbulkpipe(video->dev->udev, | |
880 | ep->desc.bEndpointAddress); | |
881 | ||
882 | if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) | |
883 | size = 0; | |
c0efd232 LP |
884 | |
885 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 886 | urb = usb_alloc_urb(0, gfp_flags); |
c0efd232 | 887 | if (urb == NULL) { |
e01117c8 | 888 | uvc_uninit_video(video, 1); |
c0efd232 LP |
889 | return -ENOMEM; |
890 | } | |
891 | ||
892 | usb_fill_bulk_urb(urb, video->dev->udev, pipe, | |
893 | video->urb_buffer[i], size, uvc_video_complete, | |
894 | video); | |
895 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; | |
e01117c8 | 896 | urb->transfer_dma = video->urb_dma[i]; |
c0efd232 LP |
897 | |
898 | video->urb[i] = urb; | |
899 | } | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
904 | /* | |
905 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
906 | */ | |
29135878 | 907 | static int uvc_init_video(struct uvc_video_device *video, gfp_t gfp_flags) |
c0efd232 LP |
908 | { |
909 | struct usb_interface *intf = video->streaming->intf; | |
910 | struct usb_host_interface *alts; | |
911 | struct usb_host_endpoint *ep = NULL; | |
912 | int intfnum = video->streaming->intfnum; | |
913 | unsigned int bandwidth, psize, i; | |
914 | int ret; | |
915 | ||
916 | video->last_fid = -1; | |
917 | video->bulk.header_size = 0; | |
918 | video->bulk.skip_payload = 0; | |
919 | video->bulk.payload_size = 0; | |
920 | ||
921 | if (intf->num_altsetting > 1) { | |
922 | /* Isochronous endpoint, select the alternate setting. */ | |
923 | bandwidth = video->streaming->ctrl.dwMaxPayloadTransferSize; | |
924 | ||
925 | if (bandwidth == 0) { | |
926 | uvc_printk(KERN_WARNING, "device %s requested null " | |
927 | "bandwidth, defaulting to lowest.\n", | |
928 | video->vdev->name); | |
929 | bandwidth = 1; | |
930 | } | |
931 | ||
932 | for (i = 0; i < intf->num_altsetting; ++i) { | |
933 | alts = &intf->altsetting[i]; | |
934 | ep = uvc_find_endpoint(alts, | |
935 | video->streaming->header.bEndpointAddress); | |
936 | if (ep == NULL) | |
937 | continue; | |
938 | ||
939 | /* Check if the bandwidth is high enough. */ | |
940 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
941 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
942 | if (psize >= bandwidth) | |
943 | break; | |
944 | } | |
945 | ||
946 | if (i >= intf->num_altsetting) | |
947 | return -EIO; | |
948 | ||
949 | if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0) | |
950 | return ret; | |
951 | ||
29135878 | 952 | ret = uvc_init_video_isoc(video, ep, gfp_flags); |
c0efd232 LP |
953 | } else { |
954 | /* Bulk endpoint, proceed to URB initialization. */ | |
955 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
956 | video->streaming->header.bEndpointAddress); | |
957 | if (ep == NULL) | |
958 | return -EIO; | |
959 | ||
29135878 | 960 | ret = uvc_init_video_bulk(video, ep, gfp_flags); |
c0efd232 LP |
961 | } |
962 | ||
963 | if (ret < 0) | |
964 | return ret; | |
965 | ||
966 | /* Submit the URBs. */ | |
967 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 968 | if ((ret = usb_submit_urb(video->urb[i], gfp_flags)) < 0) { |
c0efd232 LP |
969 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
970 | "(%d).\n", i, ret); | |
e01117c8 | 971 | uvc_uninit_video(video, 1); |
c0efd232 LP |
972 | return ret; |
973 | } | |
974 | } | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
979 | /* -------------------------------------------------------------------------- | |
980 | * Suspend/resume | |
981 | */ | |
982 | ||
983 | /* | |
984 | * Stop streaming without disabling the video queue. | |
985 | * | |
986 | * To let userspace applications resume without trouble, we must not touch the | |
987 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
988 | * completion handler won't try to cancel the queue when we kill the URBs. | |
989 | */ | |
990 | int uvc_video_suspend(struct uvc_video_device *video) | |
991 | { | |
992 | if (!uvc_queue_streaming(&video->queue)) | |
993 | return 0; | |
994 | ||
995 | video->frozen = 1; | |
e01117c8 | 996 | uvc_uninit_video(video, 0); |
c0efd232 LP |
997 | usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | /* | |
2c2d264b | 1002 | * Reconfigure the video interface and restart streaming if it was enabled |
c0efd232 LP |
1003 | * before suspend. |
1004 | * | |
1005 | * If an error occurs, disable the video queue. This will wake all pending | |
1006 | * buffers, making sure userspace applications are notified of the problem | |
1007 | * instead of waiting forever. | |
1008 | */ | |
1009 | int uvc_video_resume(struct uvc_video_device *video) | |
1010 | { | |
1011 | int ret; | |
1012 | ||
1013 | video->frozen = 0; | |
1014 | ||
23867b25 | 1015 | if ((ret = uvc_commit_video(video, &video->streaming->ctrl)) < 0) { |
c0efd232 LP |
1016 | uvc_queue_enable(&video->queue, 0); |
1017 | return ret; | |
1018 | } | |
1019 | ||
1020 | if (!uvc_queue_streaming(&video->queue)) | |
1021 | return 0; | |
1022 | ||
29135878 | 1023 | if ((ret = uvc_init_video(video, GFP_NOIO)) < 0) |
c0efd232 LP |
1024 | uvc_queue_enable(&video->queue, 0); |
1025 | ||
1026 | return ret; | |
1027 | } | |
1028 | ||
1029 | /* ------------------------------------------------------------------------ | |
1030 | * Video device | |
1031 | */ | |
1032 | ||
1033 | /* | |
2c2d264b LP |
1034 | * Initialize the UVC video device by switching to alternate setting 0 and |
1035 | * retrieve the default format. | |
c0efd232 LP |
1036 | * |
1037 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
1038 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
1039 | * violation, so try to silently fix the values if possible. | |
1040 | * | |
1041 | * This function is called before registering the device with V4L. | |
1042 | */ | |
1043 | int uvc_video_init(struct uvc_video_device *video) | |
1044 | { | |
1045 | struct uvc_streaming_control *probe = &video->streaming->ctrl; | |
1046 | struct uvc_format *format = NULL; | |
1047 | struct uvc_frame *frame = NULL; | |
1048 | unsigned int i; | |
1049 | int ret; | |
1050 | ||
1051 | if (video->streaming->nformats == 0) { | |
1052 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); | |
1053 | return -EINVAL; | |
1054 | } | |
1055 | ||
1056 | /* Alternate setting 0 should be the default, yet the XBox Live Vision | |
1057 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
1058 | * they don't receive a SET_INTERFACE request before any other video | |
1059 | * control request. | |
1060 | */ | |
1061 | usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); | |
1062 | ||
72362422 LP |
1063 | /* Set the streaming probe control with default streaming parameters |
1064 | * retrieved from the device. Webcams that don't suport GET_DEF | |
1065 | * requests on the probe control will just keep their current streaming | |
1066 | * parameters. | |
c0efd232 | 1067 | */ |
72362422 LP |
1068 | if (uvc_get_video_ctrl(video, probe, 1, GET_DEF) == 0) |
1069 | uvc_set_video_ctrl(video, probe, 1); | |
1070 | ||
1071 | /* Initialize the streaming parameters with the probe control current | |
1072 | * value. This makes sure SET_CUR requests on the streaming commit | |
1073 | * control will always use values retrieved from a successful GET_CUR | |
1074 | * request on the probe control, as required by the UVC specification. | |
1075 | */ | |
1076 | if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) | |
c0efd232 LP |
1077 | return ret; |
1078 | ||
1079 | /* Check if the default format descriptor exists. Use the first | |
1080 | * available format otherwise. | |
1081 | */ | |
1082 | for (i = video->streaming->nformats; i > 0; --i) { | |
1083 | format = &video->streaming->format[i-1]; | |
1084 | if (format->index == probe->bFormatIndex) | |
1085 | break; | |
1086 | } | |
1087 | ||
1088 | if (format->nframes == 0) { | |
1089 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
1090 | "default format.\n"); | |
1091 | return -EINVAL; | |
1092 | } | |
1093 | ||
1094 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
1095 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
1096 | * descriptor with bFrameIndex set to zero. If the default frame | |
078f8947 | 1097 | * descriptor is not found, use the first available frame. |
c0efd232 LP |
1098 | */ |
1099 | for (i = format->nframes; i > 0; --i) { | |
1100 | frame = &format->frame[i-1]; | |
1101 | if (frame->bFrameIndex == probe->bFrameIndex) | |
1102 | break; | |
1103 | } | |
1104 | ||
c0efd232 LP |
1105 | probe->bFormatIndex = format->index; |
1106 | probe->bFrameIndex = frame->bFrameIndex; | |
c0efd232 LP |
1107 | |
1108 | video->streaming->cur_format = format; | |
1109 | video->streaming->cur_frame = frame; | |
1110 | atomic_set(&video->active, 0); | |
1111 | ||
1112 | /* Select the video decoding function */ | |
ff924203 LP |
1113 | if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { |
1114 | if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
1115 | video->decode = uvc_video_decode_isight; | |
1116 | else if (video->streaming->intf->num_altsetting > 1) | |
1117 | video->decode = uvc_video_decode_isoc; | |
1118 | else | |
1119 | video->decode = uvc_video_decode_bulk; | |
1120 | } else { | |
1121 | if (video->streaming->intf->num_altsetting == 1) | |
1122 | video->decode = uvc_video_encode_bulk; | |
1123 | else { | |
1124 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | |
1125 | "supported for video output devices.\n"); | |
1126 | return -EINVAL; | |
1127 | } | |
1128 | } | |
c0efd232 LP |
1129 | |
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Enable or disable the video stream. | |
1135 | */ | |
1136 | int uvc_video_enable(struct uvc_video_device *video, int enable) | |
1137 | { | |
1138 | int ret; | |
1139 | ||
1140 | if (!enable) { | |
e01117c8 | 1141 | uvc_uninit_video(video, 1); |
c0efd232 LP |
1142 | usb_set_interface(video->dev->udev, |
1143 | video->streaming->intfnum, 0); | |
1144 | uvc_queue_enable(&video->queue, 0); | |
1145 | return 0; | |
1146 | } | |
1147 | ||
0fbd8ee6 LP |
1148 | if ((video->streaming->cur_format->flags & UVC_FMT_FLAG_COMPRESSED) || |
1149 | uvc_no_drop_param) | |
d63beb9e LP |
1150 | video->queue.flags &= ~UVC_QUEUE_DROP_INCOMPLETE; |
1151 | else | |
1152 | video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE; | |
1153 | ||
c0efd232 LP |
1154 | if ((ret = uvc_queue_enable(&video->queue, 1)) < 0) |
1155 | return ret; | |
1156 | ||
23867b25 LP |
1157 | /* Commit the streaming parameters. */ |
1158 | if ((ret = uvc_commit_video(video, &video->streaming->ctrl)) < 0) | |
1159 | return ret; | |
1160 | ||
29135878 | 1161 | return uvc_init_video(video, GFP_KERNEL); |
c0efd232 | 1162 | } |
f87086e3 | 1163 |