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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 | ||
35f02a68 | 64 | static void uvc_fixup_video_ctrl(struct uvc_streaming *stream, |
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 || | |
35f02a68 | 72 | ctrl->bFormatIndex > stream->nformats) |
c0efd232 LP |
73 | return; |
74 | ||
35f02a68 | 75 | format = &stream->format[ctrl->bFormatIndex - 1]; |
c0efd232 | 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 && | |
35f02a68 | 89 | stream->dev->uvc_version < 0x0110)) |
c0efd232 LP |
90 | ctrl->dwMaxVideoFrameSize = |
91 | frame->dwMaxVideoFrameBufferSize; | |
50144aee | 92 | |
a2e35af6 LP |
93 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) && |
94 | stream->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH && | |
35f02a68 | 95 | stream->intf->num_altsetting > 1) { |
50144aee LP |
96 | u32 interval; |
97 | u32 bandwidth; | |
98 | ||
99 | interval = (ctrl->dwFrameInterval > 100000) | |
100 | ? ctrl->dwFrameInterval | |
101 | : frame->dwFrameInterval[0]; | |
102 | ||
103 | /* Compute a bandwidth estimation by multiplying the frame | |
104 | * size by the number of video frames per second, divide the | |
105 | * result by the number of USB frames (or micro-frames for | |
106 | * high-speed devices) per second and add the UVC header size | |
107 | * (assumed to be 12 bytes long). | |
108 | */ | |
109 | bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp; | |
110 | bandwidth *= 10000000 / interval + 1; | |
111 | bandwidth /= 1000; | |
35f02a68 | 112 | if (stream->dev->udev->speed == USB_SPEED_HIGH) |
50144aee LP |
113 | bandwidth /= 8; |
114 | bandwidth += 12; | |
115 | ||
116 | ctrl->dwMaxPayloadTransferSize = bandwidth; | |
117 | } | |
c0efd232 LP |
118 | } |
119 | ||
35f02a68 | 120 | static int uvc_get_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
121 | struct uvc_streaming_control *ctrl, int probe, __u8 query) |
122 | { | |
04793dd0 LP |
123 | __u8 *data; |
124 | __u16 size; | |
c0efd232 LP |
125 | int ret; |
126 | ||
35f02a68 | 127 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; |
d2be7643 JL |
128 | if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) && |
129 | query == UVC_GET_DEF) | |
130 | return -EIO; | |
131 | ||
04793dd0 LP |
132 | data = kmalloc(size, GFP_KERNEL); |
133 | if (data == NULL) | |
134 | return -ENOMEM; | |
135 | ||
35f02a68 | 136 | ret = __uvc_query_ctrl(stream->dev, query, 0, stream->intfnum, |
b482d923 LP |
137 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, |
138 | size, UVC_CTRL_STREAMING_TIMEOUT); | |
44f0079e | 139 | |
b482d923 | 140 | if ((query == UVC_GET_MIN || query == UVC_GET_MAX) && ret == 2) { |
44f0079e LP |
141 | /* Some cameras, mostly based on Bison Electronics chipsets, |
142 | * answer a GET_MIN or GET_MAX request with the wCompQuality | |
143 | * field only. | |
144 | */ | |
35f02a68 | 145 | uvc_warn_once(stream->dev, UVC_WARN_MINMAX, "UVC non " |
44f0079e LP |
146 | "compliance - GET_MIN/MAX(PROBE) incorrectly " |
147 | "supported. Enabling workaround.\n"); | |
148 | memset(ctrl, 0, sizeof ctrl); | |
149 | ctrl->wCompQuality = le16_to_cpup((__le16 *)data); | |
150 | ret = 0; | |
04793dd0 | 151 | goto out; |
b482d923 | 152 | } else if (query == UVC_GET_DEF && probe == 1 && ret != size) { |
44f0079e LP |
153 | /* Many cameras don't support the GET_DEF request on their |
154 | * video probe control. Warn once and return, the caller will | |
155 | * fall back to GET_CUR. | |
156 | */ | |
35f02a68 | 157 | uvc_warn_once(stream->dev, UVC_WARN_PROBE_DEF, "UVC non " |
44f0079e LP |
158 | "compliance - GET_DEF(PROBE) not supported. " |
159 | "Enabling workaround.\n"); | |
160 | ret = -EIO; | |
161 | goto out; | |
162 | } else if (ret != size) { | |
163 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : " | |
164 | "%d (exp. %u).\n", query, probe ? "probe" : "commit", | |
165 | ret, size); | |
166 | ret = -EIO; | |
167 | goto out; | |
168 | } | |
c0efd232 LP |
169 | |
170 | ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); | |
171 | ctrl->bFormatIndex = data[2]; | |
172 | ctrl->bFrameIndex = data[3]; | |
173 | ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]); | |
174 | ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]); | |
175 | ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]); | |
176 | ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]); | |
177 | ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]); | |
178 | ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]); | |
4d3939f6 LP |
179 | ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]); |
180 | ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]); | |
c0efd232 LP |
181 | |
182 | if (size == 34) { | |
4d3939f6 | 183 | ctrl->dwClockFrequency = get_unaligned_le32(&data[26]); |
c0efd232 LP |
184 | ctrl->bmFramingInfo = data[30]; |
185 | ctrl->bPreferedVersion = data[31]; | |
186 | ctrl->bMinVersion = data[32]; | |
187 | ctrl->bMaxVersion = data[33]; | |
188 | } else { | |
35f02a68 | 189 | ctrl->dwClockFrequency = stream->dev->clock_frequency; |
c0efd232 LP |
190 | ctrl->bmFramingInfo = 0; |
191 | ctrl->bPreferedVersion = 0; | |
192 | ctrl->bMinVersion = 0; | |
193 | ctrl->bMaxVersion = 0; | |
194 | } | |
195 | ||
50144aee LP |
196 | /* Some broken devices return null or wrong dwMaxVideoFrameSize and |
197 | * dwMaxPayloadTransferSize fields. Try to get the value from the | |
198 | * format and frame descriptors. | |
c0efd232 | 199 | */ |
35f02a68 | 200 | uvc_fixup_video_ctrl(stream, ctrl); |
44f0079e | 201 | ret = 0; |
c0efd232 | 202 | |
04793dd0 LP |
203 | out: |
204 | kfree(data); | |
205 | return ret; | |
c0efd232 LP |
206 | } |
207 | ||
35f02a68 | 208 | static int uvc_set_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
209 | struct uvc_streaming_control *ctrl, int probe) |
210 | { | |
04793dd0 LP |
211 | __u8 *data; |
212 | __u16 size; | |
213 | int ret; | |
c0efd232 | 214 | |
35f02a68 | 215 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; |
04793dd0 LP |
216 | data = kzalloc(size, GFP_KERNEL); |
217 | if (data == NULL) | |
218 | return -ENOMEM; | |
c0efd232 LP |
219 | |
220 | *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint); | |
221 | data[2] = ctrl->bFormatIndex; | |
222 | data[3] = ctrl->bFrameIndex; | |
223 | *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval); | |
224 | *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate); | |
225 | *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate); | |
226 | *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality); | |
227 | *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize); | |
228 | *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay); | |
4d3939f6 LP |
229 | put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]); |
230 | put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]); | |
c0efd232 LP |
231 | |
232 | if (size == 34) { | |
4d3939f6 | 233 | put_unaligned_le32(ctrl->dwClockFrequency, &data[26]); |
c0efd232 LP |
234 | data[30] = ctrl->bmFramingInfo; |
235 | data[31] = ctrl->bPreferedVersion; | |
236 | data[32] = ctrl->bMinVersion; | |
237 | data[33] = ctrl->bMaxVersion; | |
238 | } | |
239 | ||
35f02a68 | 240 | ret = __uvc_query_ctrl(stream->dev, UVC_SET_CUR, 0, stream->intfnum, |
b482d923 LP |
241 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, |
242 | size, UVC_CTRL_STREAMING_TIMEOUT); | |
44f0079e LP |
243 | if (ret != size) { |
244 | uvc_printk(KERN_ERR, "Failed to set UVC %s control : " | |
245 | "%d (exp. %u).\n", probe ? "probe" : "commit", | |
246 | ret, size); | |
247 | ret = -EIO; | |
248 | } | |
04793dd0 LP |
249 | |
250 | kfree(data); | |
251 | return ret; | |
c0efd232 LP |
252 | } |
253 | ||
35f02a68 | 254 | int uvc_probe_video(struct uvc_streaming *stream, |
c0efd232 LP |
255 | struct uvc_streaming_control *probe) |
256 | { | |
257 | struct uvc_streaming_control probe_min, probe_max; | |
258 | __u16 bandwidth; | |
259 | unsigned int i; | |
260 | int ret; | |
261 | ||
35f02a68 | 262 | mutex_lock(&stream->mutex); |
c0efd232 LP |
263 | |
264 | /* Perform probing. The device should adjust the requested values | |
265 | * according to its capabilities. However, some devices, namely the | |
266 | * first generation UVC Logitech webcams, don't implement the Video | |
267 | * Probe control properly, and just return the needed bandwidth. For | |
268 | * that reason, if the needed bandwidth exceeds the maximum available | |
269 | * bandwidth, try to lower the quality. | |
270 | */ | |
35f02a68 LP |
271 | ret = uvc_set_video_ctrl(stream, probe, 1); |
272 | if (ret < 0) | |
c0efd232 LP |
273 | goto done; |
274 | ||
275 | /* Get the minimum and maximum values for compression settings. */ | |
35f02a68 LP |
276 | if (!(stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { |
277 | ret = uvc_get_video_ctrl(stream, &probe_min, 1, UVC_GET_MIN); | |
c0efd232 LP |
278 | if (ret < 0) |
279 | goto done; | |
35f02a68 | 280 | ret = uvc_get_video_ctrl(stream, &probe_max, 1, UVC_GET_MAX); |
c0efd232 LP |
281 | if (ret < 0) |
282 | goto done; | |
283 | ||
284 | probe->wCompQuality = probe_max.wCompQuality; | |
285 | } | |
286 | ||
287 | for (i = 0; i < 2; ++i) { | |
35f02a68 | 288 | ret = uvc_set_video_ctrl(stream, probe, 1); |
b482d923 LP |
289 | if (ret < 0) |
290 | goto done; | |
35f02a68 | 291 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 292 | if (ret < 0) |
c0efd232 LP |
293 | goto done; |
294 | ||
35f02a68 | 295 | if (stream->intf->num_altsetting == 1) |
c0efd232 LP |
296 | break; |
297 | ||
298 | bandwidth = probe->dwMaxPayloadTransferSize; | |
35f02a68 | 299 | if (bandwidth <= stream->maxpsize) |
c0efd232 LP |
300 | break; |
301 | ||
35f02a68 | 302 | if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { |
c0efd232 LP |
303 | ret = -ENOSPC; |
304 | goto done; | |
305 | } | |
306 | ||
307 | /* TODO: negotiate compression parameters */ | |
308 | probe->wKeyFrameRate = probe_min.wKeyFrameRate; | |
309 | probe->wPFrameRate = probe_min.wPFrameRate; | |
310 | probe->wCompQuality = probe_max.wCompQuality; | |
311 | probe->wCompWindowSize = probe_min.wCompWindowSize; | |
312 | } | |
313 | ||
314 | done: | |
35f02a68 | 315 | mutex_unlock(&stream->mutex); |
c0efd232 LP |
316 | return ret; |
317 | } | |
318 | ||
35f02a68 | 319 | int uvc_commit_video(struct uvc_streaming *stream, |
44f0079e LP |
320 | struct uvc_streaming_control *probe) |
321 | { | |
35f02a68 | 322 | return uvc_set_video_ctrl(stream, probe, 0); |
44f0079e LP |
323 | } |
324 | ||
c0efd232 LP |
325 | /* ------------------------------------------------------------------------ |
326 | * Video codecs | |
327 | */ | |
328 | ||
329 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ | |
330 | #define UVC_STREAM_EOH (1 << 7) | |
331 | #define UVC_STREAM_ERR (1 << 6) | |
332 | #define UVC_STREAM_STI (1 << 5) | |
333 | #define UVC_STREAM_RES (1 << 4) | |
334 | #define UVC_STREAM_SCR (1 << 3) | |
335 | #define UVC_STREAM_PTS (1 << 2) | |
336 | #define UVC_STREAM_EOF (1 << 1) | |
337 | #define UVC_STREAM_FID (1 << 0) | |
338 | ||
339 | /* Video payload decoding is handled by uvc_video_decode_start(), | |
340 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
341 | * | |
342 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
343 | * isochronous payload. It processes header data and returns the header size | |
344 | * in bytes if successful. If an error occurs, it returns a negative error | |
345 | * code. The following error codes have special meanings. | |
346 | * | |
347 | * - EAGAIN informs the caller that the current video buffer should be marked | |
348 | * as done, and that the function should be called again with the same data | |
349 | * and a new video buffer. This is used when end of frame conditions can be | |
350 | * reliably detected at the beginning of the next frame only. | |
351 | * | |
352 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
353 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
354 | * made until the next payload. -ENODATA can be used to drop the current | |
355 | * payload if no other error code is appropriate. | |
356 | * | |
357 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
358 | * data to the video buffer. | |
359 | * | |
360 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
361 | * isochronous payload. It performs any additional header data processing and | |
362 | * returns 0 or a negative error code if an error occured. As header data have | |
363 | * already been processed by uvc_video_decode_start, this functions isn't | |
364 | * required to perform sanity checks a second time. | |
365 | * | |
366 | * For isochronous transfers where a payload is always transfered in a single | |
367 | * URB, the three functions will be called in a row. | |
368 | * | |
369 | * To let the decoder process header data and update its internal state even | |
370 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
371 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
372 | * uvc_video_decode_end will never be called with a NULL buffer. | |
373 | */ | |
35f02a68 | 374 | static int uvc_video_decode_start(struct uvc_streaming *stream, |
c0efd232 LP |
375 | struct uvc_buffer *buf, const __u8 *data, int len) |
376 | { | |
377 | __u8 fid; | |
378 | ||
379 | /* Sanity checks: | |
380 | * - packet must be at least 2 bytes long | |
381 | * - bHeaderLength value must be at least 2 bytes (see above) | |
382 | * - bHeaderLength value can't be larger than the packet size. | |
383 | */ | |
384 | if (len < 2 || data[0] < 2 || data[0] > len) | |
385 | return -EINVAL; | |
386 | ||
387 | /* Skip payloads marked with the error bit ("error frames"). */ | |
388 | if (data[1] & UVC_STREAM_ERR) { | |
389 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | |
390 | "set).\n"); | |
391 | return -ENODATA; | |
392 | } | |
393 | ||
394 | fid = data[1] & UVC_STREAM_FID; | |
395 | ||
396 | /* Store the payload FID bit and return immediately when the buffer is | |
397 | * NULL. | |
398 | */ | |
399 | if (buf == NULL) { | |
35f02a68 | 400 | stream->last_fid = fid; |
c0efd232 LP |
401 | return -ENODATA; |
402 | } | |
403 | ||
404 | /* Synchronize to the input stream by waiting for the FID bit to be | |
405 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
35f02a68 | 406 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
407 | * frame will always be in sync. |
408 | * | |
35f02a68 | 409 | * If the device doesn't toggle the FID bit, invert stream->last_fid |
c0efd232 LP |
410 | * when the EOF bit is set to force synchronisation on the next packet. |
411 | */ | |
412 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
35f02a68 | 413 | if (fid == stream->last_fid) { |
c0efd232 LP |
414 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " |
415 | "sync).\n"); | |
35f02a68 | 416 | if ((stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && |
c0efd232 | 417 | (data[1] & UVC_STREAM_EOF)) |
35f02a68 | 418 | stream->last_fid ^= UVC_STREAM_FID; |
c0efd232 LP |
419 | return -ENODATA; |
420 | } | |
421 | ||
422 | /* TODO: Handle PTS and SCR. */ | |
423 | buf->state = UVC_BUF_STATE_ACTIVE; | |
424 | } | |
425 | ||
426 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
427 | * End of frame detection is better implemented by checking the EOF | |
428 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
429 | * bit), but some devices don't set the bit at end of frame (and the | |
430 | * last payload can be lost anyway). We thus must check if the FID has | |
431 | * been toggled. | |
432 | * | |
35f02a68 | 433 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
434 | * frame will never trigger an end of frame detection. |
435 | * | |
436 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
437 | * as it doesn't make sense to return an empty buffer. This also | |
2c2d264b | 438 | * avoids detecting end of frame conditions at FID toggling if the |
c0efd232 LP |
439 | * previous payload had the EOF bit set. |
440 | */ | |
35f02a68 | 441 | if (fid != stream->last_fid && buf->buf.bytesused != 0) { |
c0efd232 LP |
442 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " |
443 | "toggled).\n"); | |
444 | buf->state = UVC_BUF_STATE_DONE; | |
445 | return -EAGAIN; | |
446 | } | |
447 | ||
35f02a68 | 448 | stream->last_fid = fid; |
c0efd232 LP |
449 | |
450 | return data[0]; | |
451 | } | |
452 | ||
35f02a68 | 453 | static void uvc_video_decode_data(struct uvc_streaming *stream, |
c0efd232 LP |
454 | struct uvc_buffer *buf, const __u8 *data, int len) |
455 | { | |
35f02a68 | 456 | struct uvc_video_queue *queue = &stream->queue; |
c0efd232 LP |
457 | unsigned int maxlen, nbytes; |
458 | void *mem; | |
459 | ||
460 | if (len <= 0) | |
461 | return; | |
462 | ||
463 | /* Copy the video data to the buffer. */ | |
464 | maxlen = buf->buf.length - buf->buf.bytesused; | |
465 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; | |
466 | nbytes = min((unsigned int)len, maxlen); | |
467 | memcpy(mem, data, nbytes); | |
468 | buf->buf.bytesused += nbytes; | |
469 | ||
470 | /* Complete the current frame if the buffer size was exceeded. */ | |
471 | if (len > maxlen) { | |
472 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
473 | buf->state = UVC_BUF_STATE_DONE; | |
474 | } | |
475 | } | |
476 | ||
35f02a68 | 477 | static void uvc_video_decode_end(struct uvc_streaming *stream, |
c0efd232 LP |
478 | struct uvc_buffer *buf, const __u8 *data, int len) |
479 | { | |
480 | /* Mark the buffer as done if the EOF marker is set. */ | |
481 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { | |
482 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); | |
483 | if (data[0] == len) | |
484 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
485 | buf->state = UVC_BUF_STATE_DONE; | |
35f02a68 LP |
486 | if (stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) |
487 | stream->last_fid ^= UVC_STREAM_FID; | |
c0efd232 LP |
488 | } |
489 | } | |
490 | ||
2c2d264b LP |
491 | /* Video payload encoding is handled by uvc_video_encode_header() and |
492 | * uvc_video_encode_data(). Only bulk transfers are currently supported. | |
493 | * | |
494 | * uvc_video_encode_header is called at the start of a payload. It adds header | |
495 | * data to the transfer buffer and returns the header size. As the only known | |
496 | * UVC output device transfers a whole frame in a single payload, the EOF bit | |
497 | * is always set in the header. | |
498 | * | |
499 | * uvc_video_encode_data is called for every URB and copies the data from the | |
500 | * video buffer to the transfer buffer. | |
501 | */ | |
35f02a68 | 502 | static int uvc_video_encode_header(struct uvc_streaming *stream, |
ff924203 LP |
503 | struct uvc_buffer *buf, __u8 *data, int len) |
504 | { | |
505 | data[0] = 2; /* Header length */ | |
506 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | |
35f02a68 | 507 | | (stream->last_fid & UVC_STREAM_FID); |
ff924203 LP |
508 | return 2; |
509 | } | |
510 | ||
35f02a68 | 511 | static int uvc_video_encode_data(struct uvc_streaming *stream, |
ff924203 LP |
512 | struct uvc_buffer *buf, __u8 *data, int len) |
513 | { | |
35f02a68 | 514 | struct uvc_video_queue *queue = &stream->queue; |
ff924203 LP |
515 | unsigned int nbytes; |
516 | void *mem; | |
517 | ||
518 | /* Copy video data to the URB buffer. */ | |
519 | mem = queue->mem + buf->buf.m.offset + queue->buf_used; | |
520 | nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used); | |
35f02a68 | 521 | nbytes = min(stream->bulk.max_payload_size - stream->bulk.payload_size, |
ff924203 LP |
522 | nbytes); |
523 | memcpy(data, mem, nbytes); | |
524 | ||
525 | queue->buf_used += nbytes; | |
526 | ||
527 | return nbytes; | |
528 | } | |
529 | ||
c0efd232 LP |
530 | /* ------------------------------------------------------------------------ |
531 | * URB handling | |
532 | */ | |
533 | ||
534 | /* | |
535 | * Completion handler for video URBs. | |
536 | */ | |
35f02a68 LP |
537 | static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream, |
538 | struct uvc_buffer *buf) | |
c0efd232 LP |
539 | { |
540 | u8 *mem; | |
541 | int ret, i; | |
542 | ||
543 | for (i = 0; i < urb->number_of_packets; ++i) { | |
544 | if (urb->iso_frame_desc[i].status < 0) { | |
545 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
546 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
547 | continue; | |
548 | } | |
549 | ||
550 | /* Decode the payload header. */ | |
551 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
552 | do { | |
35f02a68 | 553 | ret = uvc_video_decode_start(stream, buf, mem, |
c0efd232 LP |
554 | urb->iso_frame_desc[i].actual_length); |
555 | if (ret == -EAGAIN) | |
35f02a68 LP |
556 | buf = uvc_queue_next_buffer(&stream->queue, |
557 | buf); | |
c0efd232 LP |
558 | } while (ret == -EAGAIN); |
559 | ||
560 | if (ret < 0) | |
561 | continue; | |
562 | ||
563 | /* Decode the payload data. */ | |
35f02a68 | 564 | uvc_video_decode_data(stream, buf, mem + ret, |
c0efd232 LP |
565 | urb->iso_frame_desc[i].actual_length - ret); |
566 | ||
567 | /* Process the header again. */ | |
35f02a68 | 568 | uvc_video_decode_end(stream, buf, mem, |
08ebd003 | 569 | urb->iso_frame_desc[i].actual_length); |
c0efd232 LP |
570 | |
571 | if (buf->state == UVC_BUF_STATE_DONE || | |
572 | buf->state == UVC_BUF_STATE_ERROR) | |
35f02a68 | 573 | buf = uvc_queue_next_buffer(&stream->queue, buf); |
c0efd232 LP |
574 | } |
575 | } | |
576 | ||
35f02a68 LP |
577 | static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream, |
578 | struct uvc_buffer *buf) | |
c0efd232 LP |
579 | { |
580 | u8 *mem; | |
581 | int len, ret; | |
582 | ||
c90e7779 LP |
583 | if (urb->actual_length == 0) |
584 | return; | |
585 | ||
c0efd232 LP |
586 | mem = urb->transfer_buffer; |
587 | len = urb->actual_length; | |
35f02a68 | 588 | stream->bulk.payload_size += len; |
c0efd232 LP |
589 | |
590 | /* If the URB is the first of its payload, decode and save the | |
591 | * header. | |
592 | */ | |
35f02a68 | 593 | if (stream->bulk.header_size == 0 && !stream->bulk.skip_payload) { |
c0efd232 | 594 | do { |
35f02a68 | 595 | ret = uvc_video_decode_start(stream, buf, mem, len); |
c0efd232 | 596 | if (ret == -EAGAIN) |
35f02a68 LP |
597 | buf = uvc_queue_next_buffer(&stream->queue, |
598 | buf); | |
c0efd232 LP |
599 | } while (ret == -EAGAIN); |
600 | ||
601 | /* If an error occured skip the rest of the payload. */ | |
602 | if (ret < 0 || buf == NULL) { | |
35f02a68 | 603 | stream->bulk.skip_payload = 1; |
f8dd4af6 | 604 | } else { |
35f02a68 LP |
605 | memcpy(stream->bulk.header, mem, ret); |
606 | stream->bulk.header_size = ret; | |
c0efd232 | 607 | |
f8dd4af6 LP |
608 | mem += ret; |
609 | len -= ret; | |
610 | } | |
c0efd232 LP |
611 | } |
612 | ||
613 | /* The buffer queue might have been cancelled while a bulk transfer | |
614 | * was in progress, so we can reach here with buf equal to NULL. Make | |
615 | * sure buf is never dereferenced if NULL. | |
616 | */ | |
617 | ||
618 | /* Process video data. */ | |
35f02a68 LP |
619 | if (!stream->bulk.skip_payload && buf != NULL) |
620 | uvc_video_decode_data(stream, buf, mem, len); | |
c0efd232 LP |
621 | |
622 | /* Detect the payload end by a URB smaller than the maximum size (or | |
623 | * a payload size equal to the maximum) and process the header again. | |
624 | */ | |
625 | if (urb->actual_length < urb->transfer_buffer_length || | |
35f02a68 LP |
626 | stream->bulk.payload_size >= stream->bulk.max_payload_size) { |
627 | if (!stream->bulk.skip_payload && buf != NULL) { | |
628 | uvc_video_decode_end(stream, buf, stream->bulk.header, | |
629 | stream->bulk.payload_size); | |
c0efd232 LP |
630 | if (buf->state == UVC_BUF_STATE_DONE || |
631 | buf->state == UVC_BUF_STATE_ERROR) | |
35f02a68 LP |
632 | buf = uvc_queue_next_buffer(&stream->queue, |
633 | buf); | |
c0efd232 LP |
634 | } |
635 | ||
35f02a68 LP |
636 | stream->bulk.header_size = 0; |
637 | stream->bulk.skip_payload = 0; | |
638 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
639 | } |
640 | } | |
641 | ||
35f02a68 LP |
642 | static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream, |
643 | struct uvc_buffer *buf) | |
ff924203 LP |
644 | { |
645 | u8 *mem = urb->transfer_buffer; | |
35f02a68 | 646 | int len = stream->urb_size, ret; |
ff924203 LP |
647 | |
648 | if (buf == NULL) { | |
649 | urb->transfer_buffer_length = 0; | |
650 | return; | |
651 | } | |
652 | ||
653 | /* If the URB is the first of its payload, add the header. */ | |
35f02a68 LP |
654 | if (stream->bulk.header_size == 0) { |
655 | ret = uvc_video_encode_header(stream, buf, mem, len); | |
656 | stream->bulk.header_size = ret; | |
657 | stream->bulk.payload_size += ret; | |
ff924203 LP |
658 | mem += ret; |
659 | len -= ret; | |
660 | } | |
661 | ||
662 | /* Process video data. */ | |
35f02a68 | 663 | ret = uvc_video_encode_data(stream, buf, mem, len); |
ff924203 | 664 | |
35f02a68 | 665 | stream->bulk.payload_size += ret; |
ff924203 LP |
666 | len -= ret; |
667 | ||
35f02a68 LP |
668 | if (buf->buf.bytesused == stream->queue.buf_used || |
669 | stream->bulk.payload_size == stream->bulk.max_payload_size) { | |
670 | if (buf->buf.bytesused == stream->queue.buf_used) { | |
671 | stream->queue.buf_used = 0; | |
ff924203 | 672 | buf->state = UVC_BUF_STATE_DONE; |
35f02a68 LP |
673 | uvc_queue_next_buffer(&stream->queue, buf); |
674 | stream->last_fid ^= UVC_STREAM_FID; | |
ff924203 LP |
675 | } |
676 | ||
35f02a68 LP |
677 | stream->bulk.header_size = 0; |
678 | stream->bulk.payload_size = 0; | |
ff924203 LP |
679 | } |
680 | ||
35f02a68 | 681 | urb->transfer_buffer_length = stream->urb_size - len; |
ff924203 LP |
682 | } |
683 | ||
c0efd232 LP |
684 | static void uvc_video_complete(struct urb *urb) |
685 | { | |
35f02a68 LP |
686 | struct uvc_streaming *stream = urb->context; |
687 | struct uvc_video_queue *queue = &stream->queue; | |
c0efd232 LP |
688 | struct uvc_buffer *buf = NULL; |
689 | unsigned long flags; | |
690 | int ret; | |
691 | ||
692 | switch (urb->status) { | |
693 | case 0: | |
694 | break; | |
695 | ||
696 | default: | |
697 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
698 | "completion handler.\n", urb->status); | |
699 | ||
700 | case -ENOENT: /* usb_kill_urb() called. */ | |
35f02a68 | 701 | if (stream->frozen) |
c0efd232 LP |
702 | return; |
703 | ||
704 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
705 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
706 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
707 | return; | |
708 | } | |
709 | ||
710 | spin_lock_irqsave(&queue->irqlock, flags); | |
711 | if (!list_empty(&queue->irqqueue)) | |
712 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
713 | queue); | |
714 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
715 | ||
35f02a68 | 716 | stream->decode(urb, stream, buf); |
c0efd232 LP |
717 | |
718 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
719 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
720 | ret); | |
721 | } | |
722 | } | |
723 | ||
e01117c8 LP |
724 | /* |
725 | * Free transfer buffers. | |
726 | */ | |
35f02a68 | 727 | static void uvc_free_urb_buffers(struct uvc_streaming *stream) |
e01117c8 LP |
728 | { |
729 | unsigned int i; | |
730 | ||
731 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
732 | if (stream->urb_buffer[i]) { |
733 | usb_buffer_free(stream->dev->udev, stream->urb_size, | |
734 | stream->urb_buffer[i], stream->urb_dma[i]); | |
735 | stream->urb_buffer[i] = NULL; | |
e01117c8 LP |
736 | } |
737 | } | |
738 | ||
35f02a68 | 739 | stream->urb_size = 0; |
e01117c8 LP |
740 | } |
741 | ||
742 | /* | |
743 | * Allocate transfer buffers. This function can be called with buffers | |
744 | * already allocated when resuming from suspend, in which case it will | |
745 | * return without touching the buffers. | |
746 | * | |
efdc8a95 LP |
747 | * Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the |
748 | * system is too low on memory try successively smaller numbers of packets | |
749 | * until allocation succeeds. | |
750 | * | |
751 | * Return the number of allocated packets on success or 0 when out of memory. | |
e01117c8 | 752 | */ |
35f02a68 | 753 | static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, |
efdc8a95 | 754 | unsigned int size, unsigned int psize, gfp_t gfp_flags) |
e01117c8 | 755 | { |
efdc8a95 | 756 | unsigned int npackets; |
e01117c8 LP |
757 | unsigned int i; |
758 | ||
759 | /* Buffers are already allocated, bail out. */ | |
35f02a68 LP |
760 | if (stream->urb_size) |
761 | return stream->urb_size / psize; | |
e01117c8 | 762 | |
efdc8a95 LP |
763 | /* Compute the number of packets. Bulk endpoints might transfer UVC |
764 | * payloads accross multiple URBs. | |
765 | */ | |
766 | npackets = DIV_ROUND_UP(size, psize); | |
767 | if (npackets > UVC_MAX_PACKETS) | |
768 | npackets = UVC_MAX_PACKETS; | |
769 | ||
770 | /* Retry allocations until one succeed. */ | |
771 | for (; npackets > 1; npackets /= 2) { | |
772 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
773 | stream->urb_buffer[i] = usb_buffer_alloc( |
774 | stream->dev->udev, psize * npackets, | |
775 | gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]); | |
776 | if (!stream->urb_buffer[i]) { | |
777 | uvc_free_urb_buffers(stream); | |
efdc8a95 LP |
778 | break; |
779 | } | |
780 | } | |
781 | ||
782 | if (i == UVC_URBS) { | |
35f02a68 | 783 | stream->urb_size = psize * npackets; |
efdc8a95 | 784 | return npackets; |
e01117c8 LP |
785 | } |
786 | } | |
787 | ||
e01117c8 LP |
788 | return 0; |
789 | } | |
790 | ||
c0efd232 LP |
791 | /* |
792 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
793 | */ | |
35f02a68 | 794 | static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) |
c0efd232 LP |
795 | { |
796 | struct urb *urb; | |
797 | unsigned int i; | |
798 | ||
799 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
800 | urb = stream->urb[i]; |
801 | if (urb == NULL) | |
c0efd232 LP |
802 | continue; |
803 | ||
804 | usb_kill_urb(urb); | |
c0efd232 | 805 | usb_free_urb(urb); |
35f02a68 | 806 | stream->urb[i] = NULL; |
c0efd232 | 807 | } |
e01117c8 LP |
808 | |
809 | if (free_buffers) | |
35f02a68 | 810 | uvc_free_urb_buffers(stream); |
c0efd232 LP |
811 | } |
812 | ||
813 | /* | |
814 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
815 | * is given by the endpoint. | |
816 | */ | |
35f02a68 | 817 | static int uvc_init_video_isoc(struct uvc_streaming *stream, |
29135878 | 818 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
819 | { |
820 | struct urb *urb; | |
821 | unsigned int npackets, i, j; | |
efdc8a95 LP |
822 | u16 psize; |
823 | u32 size; | |
c0efd232 | 824 | |
c0efd232 LP |
825 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
826 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
35f02a68 | 827 | size = stream->ctrl.dwMaxVideoFrameSize; |
c0efd232 | 828 | |
35f02a68 | 829 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 LP |
830 | if (npackets == 0) |
831 | return -ENOMEM; | |
c0efd232 LP |
832 | |
833 | size = npackets * psize; | |
834 | ||
835 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 836 | urb = usb_alloc_urb(npackets, gfp_flags); |
c0efd232 | 837 | if (urb == NULL) { |
35f02a68 | 838 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
839 | return -ENOMEM; |
840 | } | |
841 | ||
35f02a68 LP |
842 | urb->dev = stream->dev->udev; |
843 | urb->context = stream; | |
844 | urb->pipe = usb_rcvisocpipe(stream->dev->udev, | |
c0efd232 LP |
845 | ep->desc.bEndpointAddress); |
846 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
847 | urb->interval = ep->desc.bInterval; | |
35f02a68 LP |
848 | urb->transfer_buffer = stream->urb_buffer[i]; |
849 | urb->transfer_dma = stream->urb_dma[i]; | |
c0efd232 LP |
850 | urb->complete = uvc_video_complete; |
851 | urb->number_of_packets = npackets; | |
852 | urb->transfer_buffer_length = size; | |
853 | ||
854 | for (j = 0; j < npackets; ++j) { | |
855 | urb->iso_frame_desc[j].offset = j * psize; | |
856 | urb->iso_frame_desc[j].length = psize; | |
857 | } | |
858 | ||
35f02a68 | 859 | stream->urb[i] = urb; |
c0efd232 LP |
860 | } |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
865 | /* | |
866 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
867 | * given by the endpoint. | |
868 | */ | |
35f02a68 | 869 | static int uvc_init_video_bulk(struct uvc_streaming *stream, |
29135878 | 870 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
871 | { |
872 | struct urb *urb; | |
efdc8a95 LP |
873 | unsigned int npackets, pipe, i; |
874 | u16 psize; | |
875 | u32 size; | |
876 | ||
c0efd232 | 877 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; |
35f02a68 LP |
878 | size = stream->ctrl.dwMaxPayloadTransferSize; |
879 | stream->bulk.max_payload_size = size; | |
c0efd232 | 880 | |
35f02a68 | 881 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 | 882 | if (npackets == 0) |
e01117c8 LP |
883 | return -ENOMEM; |
884 | ||
efdc8a95 LP |
885 | size = npackets * psize; |
886 | ||
ff924203 | 887 | if (usb_endpoint_dir_in(&ep->desc)) |
35f02a68 | 888 | pipe = usb_rcvbulkpipe(stream->dev->udev, |
ff924203 LP |
889 | ep->desc.bEndpointAddress); |
890 | else | |
35f02a68 | 891 | pipe = usb_sndbulkpipe(stream->dev->udev, |
ff924203 LP |
892 | ep->desc.bEndpointAddress); |
893 | ||
35f02a68 | 894 | if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) |
ff924203 | 895 | size = 0; |
c0efd232 LP |
896 | |
897 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 898 | urb = usb_alloc_urb(0, gfp_flags); |
c0efd232 | 899 | if (urb == NULL) { |
35f02a68 | 900 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
901 | return -ENOMEM; |
902 | } | |
903 | ||
35f02a68 LP |
904 | usb_fill_bulk_urb(urb, stream->dev->udev, pipe, |
905 | stream->urb_buffer[i], size, uvc_video_complete, | |
906 | stream); | |
c0efd232 | 907 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
35f02a68 | 908 | urb->transfer_dma = stream->urb_dma[i]; |
c0efd232 | 909 | |
35f02a68 | 910 | stream->urb[i] = urb; |
c0efd232 LP |
911 | } |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
916 | /* | |
917 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
918 | */ | |
35f02a68 | 919 | static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags) |
c0efd232 | 920 | { |
35f02a68 | 921 | struct usb_interface *intf = stream->intf; |
c0efd232 LP |
922 | struct usb_host_interface *alts; |
923 | struct usb_host_endpoint *ep = NULL; | |
35f02a68 | 924 | int intfnum = stream->intfnum; |
c0efd232 LP |
925 | unsigned int bandwidth, psize, i; |
926 | int ret; | |
927 | ||
35f02a68 LP |
928 | stream->last_fid = -1; |
929 | stream->bulk.header_size = 0; | |
930 | stream->bulk.skip_payload = 0; | |
931 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
932 | |
933 | if (intf->num_altsetting > 1) { | |
934 | /* Isochronous endpoint, select the alternate setting. */ | |
35f02a68 | 935 | bandwidth = stream->ctrl.dwMaxPayloadTransferSize; |
c0efd232 LP |
936 | |
937 | if (bandwidth == 0) { | |
938 | uvc_printk(KERN_WARNING, "device %s requested null " | |
939 | "bandwidth, defaulting to lowest.\n", | |
35f02a68 | 940 | stream->dev->name); |
c0efd232 LP |
941 | bandwidth = 1; |
942 | } | |
943 | ||
944 | for (i = 0; i < intf->num_altsetting; ++i) { | |
945 | alts = &intf->altsetting[i]; | |
946 | ep = uvc_find_endpoint(alts, | |
35f02a68 | 947 | stream->header.bEndpointAddress); |
c0efd232 LP |
948 | if (ep == NULL) |
949 | continue; | |
950 | ||
951 | /* Check if the bandwidth is high enough. */ | |
952 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
953 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
954 | if (psize >= bandwidth) | |
955 | break; | |
956 | } | |
957 | ||
958 | if (i >= intf->num_altsetting) | |
959 | return -EIO; | |
960 | ||
35f02a68 LP |
961 | ret = usb_set_interface(stream->dev->udev, intfnum, i); |
962 | if (ret < 0) | |
c0efd232 LP |
963 | return ret; |
964 | ||
35f02a68 | 965 | ret = uvc_init_video_isoc(stream, ep, gfp_flags); |
c0efd232 LP |
966 | } else { |
967 | /* Bulk endpoint, proceed to URB initialization. */ | |
968 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
35f02a68 | 969 | stream->header.bEndpointAddress); |
c0efd232 LP |
970 | if (ep == NULL) |
971 | return -EIO; | |
972 | ||
35f02a68 | 973 | ret = uvc_init_video_bulk(stream, ep, gfp_flags); |
c0efd232 LP |
974 | } |
975 | ||
976 | if (ret < 0) | |
977 | return ret; | |
978 | ||
979 | /* Submit the URBs. */ | |
980 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
981 | ret = usb_submit_urb(stream->urb[i], gfp_flags); |
982 | if (ret < 0) { | |
c0efd232 LP |
983 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
984 | "(%d).\n", i, ret); | |
35f02a68 | 985 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
986 | return ret; |
987 | } | |
988 | } | |
989 | ||
990 | return 0; | |
991 | } | |
992 | ||
993 | /* -------------------------------------------------------------------------- | |
994 | * Suspend/resume | |
995 | */ | |
996 | ||
997 | /* | |
998 | * Stop streaming without disabling the video queue. | |
999 | * | |
1000 | * To let userspace applications resume without trouble, we must not touch the | |
1001 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
1002 | * completion handler won't try to cancel the queue when we kill the URBs. | |
1003 | */ | |
35f02a68 | 1004 | int uvc_video_suspend(struct uvc_streaming *stream) |
c0efd232 | 1005 | { |
35f02a68 | 1006 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1007 | return 0; |
1008 | ||
35f02a68 LP |
1009 | stream->frozen = 1; |
1010 | uvc_uninit_video(stream, 0); | |
1011 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
c0efd232 LP |
1012 | return 0; |
1013 | } | |
1014 | ||
1015 | /* | |
2c2d264b | 1016 | * Reconfigure the video interface and restart streaming if it was enabled |
c0efd232 LP |
1017 | * before suspend. |
1018 | * | |
1019 | * If an error occurs, disable the video queue. This will wake all pending | |
1020 | * buffers, making sure userspace applications are notified of the problem | |
1021 | * instead of waiting forever. | |
1022 | */ | |
35f02a68 | 1023 | int uvc_video_resume(struct uvc_streaming *stream) |
c0efd232 LP |
1024 | { |
1025 | int ret; | |
1026 | ||
35f02a68 | 1027 | stream->frozen = 0; |
c0efd232 | 1028 | |
35f02a68 LP |
1029 | ret = uvc_commit_video(stream, &stream->ctrl); |
1030 | if (ret < 0) { | |
1031 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1032 | return ret; |
1033 | } | |
1034 | ||
35f02a68 | 1035 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1036 | return 0; |
1037 | ||
35f02a68 LP |
1038 | ret = uvc_init_video(stream, GFP_NOIO); |
1039 | if (ret < 0) | |
1040 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1041 | |
1042 | return ret; | |
1043 | } | |
1044 | ||
1045 | /* ------------------------------------------------------------------------ | |
1046 | * Video device | |
1047 | */ | |
1048 | ||
1049 | /* | |
2c2d264b LP |
1050 | * Initialize the UVC video device by switching to alternate setting 0 and |
1051 | * retrieve the default format. | |
c0efd232 LP |
1052 | * |
1053 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
1054 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
1055 | * violation, so try to silently fix the values if possible. | |
1056 | * | |
1057 | * This function is called before registering the device with V4L. | |
1058 | */ | |
35f02a68 | 1059 | int uvc_video_init(struct uvc_streaming *stream) |
c0efd232 | 1060 | { |
35f02a68 | 1061 | struct uvc_streaming_control *probe = &stream->ctrl; |
c0efd232 LP |
1062 | struct uvc_format *format = NULL; |
1063 | struct uvc_frame *frame = NULL; | |
1064 | unsigned int i; | |
1065 | int ret; | |
1066 | ||
35f02a68 | 1067 | if (stream->nformats == 0) { |
c0efd232 LP |
1068 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); |
1069 | return -EINVAL; | |
1070 | } | |
1071 | ||
35f02a68 LP |
1072 | atomic_set(&stream->active, 0); |
1073 | ||
1074 | /* Initialize the video buffers queue. */ | |
1075 | uvc_queue_init(&stream->queue, stream->type); | |
1076 | ||
c0efd232 LP |
1077 | /* Alternate setting 0 should be the default, yet the XBox Live Vision |
1078 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
1079 | * they don't receive a SET_INTERFACE request before any other video | |
1080 | * control request. | |
1081 | */ | |
35f02a68 | 1082 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); |
c0efd232 | 1083 | |
72362422 LP |
1084 | /* Set the streaming probe control with default streaming parameters |
1085 | * retrieved from the device. Webcams that don't suport GET_DEF | |
1086 | * requests on the probe control will just keep their current streaming | |
1087 | * parameters. | |
c0efd232 | 1088 | */ |
35f02a68 LP |
1089 | if (uvc_get_video_ctrl(stream, probe, 1, UVC_GET_DEF) == 0) |
1090 | uvc_set_video_ctrl(stream, probe, 1); | |
72362422 LP |
1091 | |
1092 | /* Initialize the streaming parameters with the probe control current | |
1093 | * value. This makes sure SET_CUR requests on the streaming commit | |
1094 | * control will always use values retrieved from a successful GET_CUR | |
1095 | * request on the probe control, as required by the UVC specification. | |
1096 | */ | |
35f02a68 | 1097 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 1098 | if (ret < 0) |
c0efd232 LP |
1099 | return ret; |
1100 | ||
1101 | /* Check if the default format descriptor exists. Use the first | |
1102 | * available format otherwise. | |
1103 | */ | |
35f02a68 LP |
1104 | for (i = stream->nformats; i > 0; --i) { |
1105 | format = &stream->format[i-1]; | |
c0efd232 LP |
1106 | if (format->index == probe->bFormatIndex) |
1107 | break; | |
1108 | } | |
1109 | ||
1110 | if (format->nframes == 0) { | |
1111 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
1112 | "default format.\n"); | |
1113 | return -EINVAL; | |
1114 | } | |
1115 | ||
1116 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
1117 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
1118 | * descriptor with bFrameIndex set to zero. If the default frame | |
078f8947 | 1119 | * descriptor is not found, use the first available frame. |
c0efd232 LP |
1120 | */ |
1121 | for (i = format->nframes; i > 0; --i) { | |
1122 | frame = &format->frame[i-1]; | |
1123 | if (frame->bFrameIndex == probe->bFrameIndex) | |
1124 | break; | |
1125 | } | |
1126 | ||
c0efd232 LP |
1127 | probe->bFormatIndex = format->index; |
1128 | probe->bFrameIndex = frame->bFrameIndex; | |
c0efd232 | 1129 | |
35f02a68 LP |
1130 | stream->cur_format = format; |
1131 | stream->cur_frame = frame; | |
c0efd232 LP |
1132 | |
1133 | /* Select the video decoding function */ | |
35f02a68 LP |
1134 | if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { |
1135 | if (stream->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
1136 | stream->decode = uvc_video_decode_isight; | |
1137 | else if (stream->intf->num_altsetting > 1) | |
1138 | stream->decode = uvc_video_decode_isoc; | |
ff924203 | 1139 | else |
35f02a68 | 1140 | stream->decode = uvc_video_decode_bulk; |
ff924203 | 1141 | } else { |
35f02a68 LP |
1142 | if (stream->intf->num_altsetting == 1) |
1143 | stream->decode = uvc_video_encode_bulk; | |
ff924203 LP |
1144 | else { |
1145 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | |
1146 | "supported for video output devices.\n"); | |
1147 | return -EINVAL; | |
1148 | } | |
1149 | } | |
c0efd232 LP |
1150 | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * Enable or disable the video stream. | |
1156 | */ | |
35f02a68 | 1157 | int uvc_video_enable(struct uvc_streaming *stream, int enable) |
c0efd232 LP |
1158 | { |
1159 | int ret; | |
1160 | ||
1161 | if (!enable) { | |
35f02a68 LP |
1162 | uvc_uninit_video(stream, 1); |
1163 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1164 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1165 | return 0; |
1166 | } | |
1167 | ||
35f02a68 | 1168 | if ((stream->cur_format->flags & UVC_FMT_FLAG_COMPRESSED) || |
0fbd8ee6 | 1169 | uvc_no_drop_param) |
35f02a68 | 1170 | stream->queue.flags &= ~UVC_QUEUE_DROP_INCOMPLETE; |
d63beb9e | 1171 | else |
35f02a68 | 1172 | stream->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE; |
d63beb9e | 1173 | |
35f02a68 LP |
1174 | ret = uvc_queue_enable(&stream->queue, 1); |
1175 | if (ret < 0) | |
c0efd232 LP |
1176 | return ret; |
1177 | ||
23867b25 | 1178 | /* Commit the streaming parameters. */ |
35f02a68 LP |
1179 | ret = uvc_commit_video(stream, &stream->ctrl); |
1180 | if (ret < 0) | |
23867b25 LP |
1181 | return ret; |
1182 | ||
35f02a68 | 1183 | return uvc_init_video(stream, GFP_KERNEL); |
c0efd232 | 1184 | } |
f87086e3 | 1185 |