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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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
c0efd232 LP |
18 | #include <linux/usb.h> |
19 | #include <linux/videodev2.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/wait.h> | |
22 | #include <asm/atomic.h> | |
23 | #include <asm/unaligned.h> | |
24 | ||
25 | #include <media/v4l2-common.h> | |
26 | ||
27 | #include "uvcvideo.h" | |
28 | ||
29 | /* ------------------------------------------------------------------------ | |
30 | * UVC Controls | |
31 | */ | |
32 | ||
33 | static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, | |
34 | __u8 intfnum, __u8 cs, void *data, __u16 size, | |
35 | int timeout) | |
36 | { | |
37 | __u8 type = USB_TYPE_CLASS | USB_RECIP_INTERFACE; | |
38 | unsigned int pipe; | |
c0efd232 LP |
39 | |
40 | pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0) | |
41 | : usb_sndctrlpipe(dev->udev, 0); | |
42 | type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT; | |
43 | ||
44f0079e | 44 | return usb_control_msg(dev->udev, pipe, query, type, cs << 8, |
c0efd232 | 45 | unit << 8 | intfnum, data, size, timeout); |
44f0079e LP |
46 | } |
47 | ||
48 | int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, | |
49 | __u8 intfnum, __u8 cs, void *data, __u16 size) | |
50 | { | |
51 | int ret; | |
c0efd232 | 52 | |
44f0079e LP |
53 | ret = __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, |
54 | UVC_CTRL_CONTROL_TIMEOUT); | |
c0efd232 LP |
55 | if (ret != size) { |
56 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u " | |
57 | "(unit %u) : %d (exp. %u).\n", query, cs, unit, ret, | |
58 | size); | |
59 | return -EIO; | |
60 | } | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
35f02a68 | 65 | static void uvc_fixup_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
66 | struct uvc_streaming_control *ctrl) |
67 | { | |
68 | struct uvc_format *format; | |
078f8947 LP |
69 | struct uvc_frame *frame = NULL; |
70 | unsigned int i; | |
c0efd232 LP |
71 | |
72 | if (ctrl->bFormatIndex <= 0 || | |
35f02a68 | 73 | ctrl->bFormatIndex > stream->nformats) |
c0efd232 LP |
74 | return; |
75 | ||
35f02a68 | 76 | format = &stream->format[ctrl->bFormatIndex - 1]; |
c0efd232 | 77 | |
078f8947 LP |
78 | for (i = 0; i < format->nframes; ++i) { |
79 | if (format->frame[i].bFrameIndex == ctrl->bFrameIndex) { | |
80 | frame = &format->frame[i]; | |
81 | break; | |
82 | } | |
83 | } | |
c0efd232 | 84 | |
078f8947 LP |
85 | if (frame == NULL) |
86 | return; | |
c0efd232 LP |
87 | |
88 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || | |
89 | (ctrl->dwMaxVideoFrameSize == 0 && | |
35f02a68 | 90 | stream->dev->uvc_version < 0x0110)) |
c0efd232 LP |
91 | ctrl->dwMaxVideoFrameSize = |
92 | frame->dwMaxVideoFrameBufferSize; | |
50144aee | 93 | |
a2e35af6 LP |
94 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) && |
95 | stream->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH && | |
35f02a68 | 96 | stream->intf->num_altsetting > 1) { |
50144aee LP |
97 | u32 interval; |
98 | u32 bandwidth; | |
99 | ||
100 | interval = (ctrl->dwFrameInterval > 100000) | |
101 | ? ctrl->dwFrameInterval | |
102 | : frame->dwFrameInterval[0]; | |
103 | ||
104 | /* Compute a bandwidth estimation by multiplying the frame | |
105 | * size by the number of video frames per second, divide the | |
106 | * result by the number of USB frames (or micro-frames for | |
107 | * high-speed devices) per second and add the UVC header size | |
108 | * (assumed to be 12 bytes long). | |
109 | */ | |
110 | bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp; | |
111 | bandwidth *= 10000000 / interval + 1; | |
112 | bandwidth /= 1000; | |
35f02a68 | 113 | if (stream->dev->udev->speed == USB_SPEED_HIGH) |
50144aee LP |
114 | bandwidth /= 8; |
115 | bandwidth += 12; | |
116 | ||
117 | ctrl->dwMaxPayloadTransferSize = bandwidth; | |
118 | } | |
c0efd232 LP |
119 | } |
120 | ||
35f02a68 | 121 | static int uvc_get_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
122 | struct uvc_streaming_control *ctrl, int probe, __u8 query) |
123 | { | |
04793dd0 LP |
124 | __u8 *data; |
125 | __u16 size; | |
c0efd232 LP |
126 | int ret; |
127 | ||
35f02a68 | 128 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; |
d2be7643 JL |
129 | if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) && |
130 | query == UVC_GET_DEF) | |
131 | return -EIO; | |
132 | ||
04793dd0 LP |
133 | data = kmalloc(size, GFP_KERNEL); |
134 | if (data == NULL) | |
135 | return -ENOMEM; | |
136 | ||
35f02a68 | 137 | ret = __uvc_query_ctrl(stream->dev, query, 0, stream->intfnum, |
b482d923 | 138 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, |
b232a012 | 139 | size, uvc_timeout_param); |
44f0079e | 140 | |
b482d923 | 141 | if ((query == UVC_GET_MIN || query == UVC_GET_MAX) && ret == 2) { |
44f0079e LP |
142 | /* Some cameras, mostly based on Bison Electronics chipsets, |
143 | * answer a GET_MIN or GET_MAX request with the wCompQuality | |
144 | * field only. | |
145 | */ | |
35f02a68 | 146 | uvc_warn_once(stream->dev, UVC_WARN_MINMAX, "UVC non " |
44f0079e LP |
147 | "compliance - GET_MIN/MAX(PROBE) incorrectly " |
148 | "supported. Enabling workaround.\n"); | |
ddb0b34f | 149 | memset(ctrl, 0, sizeof *ctrl); |
44f0079e LP |
150 | ctrl->wCompQuality = le16_to_cpup((__le16 *)data); |
151 | ret = 0; | |
04793dd0 | 152 | goto out; |
b482d923 | 153 | } else if (query == UVC_GET_DEF && probe == 1 && ret != size) { |
44f0079e LP |
154 | /* Many cameras don't support the GET_DEF request on their |
155 | * video probe control. Warn once and return, the caller will | |
156 | * fall back to GET_CUR. | |
157 | */ | |
35f02a68 | 158 | uvc_warn_once(stream->dev, UVC_WARN_PROBE_DEF, "UVC non " |
44f0079e LP |
159 | "compliance - GET_DEF(PROBE) not supported. " |
160 | "Enabling workaround.\n"); | |
161 | ret = -EIO; | |
162 | goto out; | |
163 | } else if (ret != size) { | |
164 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : " | |
165 | "%d (exp. %u).\n", query, probe ? "probe" : "commit", | |
166 | ret, size); | |
167 | ret = -EIO; | |
168 | goto out; | |
169 | } | |
c0efd232 LP |
170 | |
171 | ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); | |
172 | ctrl->bFormatIndex = data[2]; | |
173 | ctrl->bFrameIndex = data[3]; | |
174 | ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]); | |
175 | ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]); | |
176 | ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]); | |
177 | ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]); | |
178 | ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]); | |
179 | ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]); | |
4d3939f6 LP |
180 | ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]); |
181 | ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]); | |
c0efd232 LP |
182 | |
183 | if (size == 34) { | |
4d3939f6 | 184 | ctrl->dwClockFrequency = get_unaligned_le32(&data[26]); |
c0efd232 LP |
185 | ctrl->bmFramingInfo = data[30]; |
186 | ctrl->bPreferedVersion = data[31]; | |
187 | ctrl->bMinVersion = data[32]; | |
188 | ctrl->bMaxVersion = data[33]; | |
189 | } else { | |
35f02a68 | 190 | ctrl->dwClockFrequency = stream->dev->clock_frequency; |
c0efd232 LP |
191 | ctrl->bmFramingInfo = 0; |
192 | ctrl->bPreferedVersion = 0; | |
193 | ctrl->bMinVersion = 0; | |
194 | ctrl->bMaxVersion = 0; | |
195 | } | |
196 | ||
50144aee LP |
197 | /* Some broken devices return null or wrong dwMaxVideoFrameSize and |
198 | * dwMaxPayloadTransferSize fields. Try to get the value from the | |
199 | * format and frame descriptors. | |
c0efd232 | 200 | */ |
35f02a68 | 201 | uvc_fixup_video_ctrl(stream, ctrl); |
44f0079e | 202 | ret = 0; |
c0efd232 | 203 | |
04793dd0 LP |
204 | out: |
205 | kfree(data); | |
206 | return ret; | |
c0efd232 LP |
207 | } |
208 | ||
35f02a68 | 209 | static int uvc_set_video_ctrl(struct uvc_streaming *stream, |
c0efd232 LP |
210 | struct uvc_streaming_control *ctrl, int probe) |
211 | { | |
04793dd0 LP |
212 | __u8 *data; |
213 | __u16 size; | |
214 | int ret; | |
c0efd232 | 215 | |
35f02a68 | 216 | size = stream->dev->uvc_version >= 0x0110 ? 34 : 26; |
04793dd0 LP |
217 | data = kzalloc(size, GFP_KERNEL); |
218 | if (data == NULL) | |
219 | return -ENOMEM; | |
c0efd232 LP |
220 | |
221 | *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint); | |
222 | data[2] = ctrl->bFormatIndex; | |
223 | data[3] = ctrl->bFrameIndex; | |
224 | *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval); | |
225 | *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate); | |
226 | *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate); | |
227 | *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality); | |
228 | *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize); | |
229 | *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay); | |
4d3939f6 LP |
230 | put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]); |
231 | put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]); | |
c0efd232 LP |
232 | |
233 | if (size == 34) { | |
4d3939f6 | 234 | put_unaligned_le32(ctrl->dwClockFrequency, &data[26]); |
c0efd232 LP |
235 | data[30] = ctrl->bmFramingInfo; |
236 | data[31] = ctrl->bPreferedVersion; | |
237 | data[32] = ctrl->bMinVersion; | |
238 | data[33] = ctrl->bMaxVersion; | |
239 | } | |
240 | ||
35f02a68 | 241 | ret = __uvc_query_ctrl(stream->dev, UVC_SET_CUR, 0, stream->intfnum, |
b482d923 | 242 | probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data, |
b232a012 | 243 | size, uvc_timeout_param); |
44f0079e LP |
244 | if (ret != size) { |
245 | uvc_printk(KERN_ERR, "Failed to set UVC %s control : " | |
246 | "%d (exp. %u).\n", probe ? "probe" : "commit", | |
247 | ret, size); | |
248 | ret = -EIO; | |
249 | } | |
04793dd0 LP |
250 | |
251 | kfree(data); | |
252 | return ret; | |
c0efd232 LP |
253 | } |
254 | ||
35f02a68 | 255 | int uvc_probe_video(struct uvc_streaming *stream, |
c0efd232 LP |
256 | struct uvc_streaming_control *probe) |
257 | { | |
258 | struct uvc_streaming_control probe_min, probe_max; | |
259 | __u16 bandwidth; | |
260 | unsigned int i; | |
261 | int ret; | |
262 | ||
35f02a68 | 263 | mutex_lock(&stream->mutex); |
c0efd232 LP |
264 | |
265 | /* Perform probing. The device should adjust the requested values | |
266 | * according to its capabilities. However, some devices, namely the | |
267 | * first generation UVC Logitech webcams, don't implement the Video | |
268 | * Probe control properly, and just return the needed bandwidth. For | |
269 | * that reason, if the needed bandwidth exceeds the maximum available | |
270 | * bandwidth, try to lower the quality. | |
271 | */ | |
35f02a68 LP |
272 | ret = uvc_set_video_ctrl(stream, probe, 1); |
273 | if (ret < 0) | |
c0efd232 LP |
274 | goto done; |
275 | ||
276 | /* Get the minimum and maximum values for compression settings. */ | |
35f02a68 LP |
277 | if (!(stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { |
278 | ret = uvc_get_video_ctrl(stream, &probe_min, 1, UVC_GET_MIN); | |
c0efd232 LP |
279 | if (ret < 0) |
280 | goto done; | |
35f02a68 | 281 | ret = uvc_get_video_ctrl(stream, &probe_max, 1, UVC_GET_MAX); |
c0efd232 LP |
282 | if (ret < 0) |
283 | goto done; | |
284 | ||
285 | probe->wCompQuality = probe_max.wCompQuality; | |
286 | } | |
287 | ||
288 | for (i = 0; i < 2; ++i) { | |
35f02a68 | 289 | ret = uvc_set_video_ctrl(stream, probe, 1); |
b482d923 LP |
290 | if (ret < 0) |
291 | goto done; | |
35f02a68 | 292 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 293 | if (ret < 0) |
c0efd232 LP |
294 | goto done; |
295 | ||
35f02a68 | 296 | if (stream->intf->num_altsetting == 1) |
c0efd232 LP |
297 | break; |
298 | ||
299 | bandwidth = probe->dwMaxPayloadTransferSize; | |
35f02a68 | 300 | if (bandwidth <= stream->maxpsize) |
c0efd232 LP |
301 | break; |
302 | ||
35f02a68 | 303 | if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { |
c0efd232 LP |
304 | ret = -ENOSPC; |
305 | goto done; | |
306 | } | |
307 | ||
308 | /* TODO: negotiate compression parameters */ | |
309 | probe->wKeyFrameRate = probe_min.wKeyFrameRate; | |
310 | probe->wPFrameRate = probe_min.wPFrameRate; | |
311 | probe->wCompQuality = probe_max.wCompQuality; | |
312 | probe->wCompWindowSize = probe_min.wCompWindowSize; | |
313 | } | |
314 | ||
315 | done: | |
35f02a68 | 316 | mutex_unlock(&stream->mutex); |
c0efd232 LP |
317 | return ret; |
318 | } | |
319 | ||
35f02a68 | 320 | int uvc_commit_video(struct uvc_streaming *stream, |
44f0079e LP |
321 | struct uvc_streaming_control *probe) |
322 | { | |
35f02a68 | 323 | return uvc_set_video_ctrl(stream, probe, 0); |
44f0079e LP |
324 | } |
325 | ||
c0efd232 LP |
326 | /* ------------------------------------------------------------------------ |
327 | * Video codecs | |
328 | */ | |
329 | ||
330 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ | |
331 | #define UVC_STREAM_EOH (1 << 7) | |
332 | #define UVC_STREAM_ERR (1 << 6) | |
333 | #define UVC_STREAM_STI (1 << 5) | |
334 | #define UVC_STREAM_RES (1 << 4) | |
335 | #define UVC_STREAM_SCR (1 << 3) | |
336 | #define UVC_STREAM_PTS (1 << 2) | |
337 | #define UVC_STREAM_EOF (1 << 1) | |
338 | #define UVC_STREAM_FID (1 << 0) | |
339 | ||
340 | /* Video payload decoding is handled by uvc_video_decode_start(), | |
341 | * uvc_video_decode_data() and uvc_video_decode_end(). | |
342 | * | |
343 | * uvc_video_decode_start is called with URB data at the start of a bulk or | |
344 | * isochronous payload. It processes header data and returns the header size | |
345 | * in bytes if successful. If an error occurs, it returns a negative error | |
346 | * code. The following error codes have special meanings. | |
347 | * | |
348 | * - EAGAIN informs the caller that the current video buffer should be marked | |
349 | * as done, and that the function should be called again with the same data | |
350 | * and a new video buffer. This is used when end of frame conditions can be | |
351 | * reliably detected at the beginning of the next frame only. | |
352 | * | |
353 | * If an error other than -EAGAIN is returned, the caller will drop the current | |
354 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be | |
355 | * made until the next payload. -ENODATA can be used to drop the current | |
356 | * payload if no other error code is appropriate. | |
357 | * | |
358 | * uvc_video_decode_data is called for every URB with URB data. It copies the | |
359 | * data to the video buffer. | |
360 | * | |
361 | * uvc_video_decode_end is called with header data at the end of a bulk or | |
362 | * isochronous payload. It performs any additional header data processing and | |
363 | * returns 0 or a negative error code if an error occured. As header data have | |
364 | * already been processed by uvc_video_decode_start, this functions isn't | |
365 | * required to perform sanity checks a second time. | |
366 | * | |
367 | * For isochronous transfers where a payload is always transfered in a single | |
368 | * URB, the three functions will be called in a row. | |
369 | * | |
370 | * To let the decoder process header data and update its internal state even | |
371 | * when no video buffer is available, uvc_video_decode_start must be prepared | |
372 | * to be called with a NULL buf parameter. uvc_video_decode_data and | |
373 | * uvc_video_decode_end will never be called with a NULL buffer. | |
374 | */ | |
35f02a68 | 375 | static int uvc_video_decode_start(struct uvc_streaming *stream, |
c0efd232 LP |
376 | struct uvc_buffer *buf, const __u8 *data, int len) |
377 | { | |
378 | __u8 fid; | |
379 | ||
380 | /* Sanity checks: | |
381 | * - packet must be at least 2 bytes long | |
382 | * - bHeaderLength value must be at least 2 bytes (see above) | |
383 | * - bHeaderLength value can't be larger than the packet size. | |
384 | */ | |
385 | if (len < 2 || data[0] < 2 || data[0] > len) | |
386 | return -EINVAL; | |
387 | ||
388 | /* Skip payloads marked with the error bit ("error frames"). */ | |
389 | if (data[1] & UVC_STREAM_ERR) { | |
390 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " | |
391 | "set).\n"); | |
392 | return -ENODATA; | |
393 | } | |
394 | ||
395 | fid = data[1] & UVC_STREAM_FID; | |
396 | ||
397 | /* Store the payload FID bit and return immediately when the buffer is | |
398 | * NULL. | |
399 | */ | |
400 | if (buf == NULL) { | |
35f02a68 | 401 | stream->last_fid = fid; |
c0efd232 LP |
402 | return -ENODATA; |
403 | } | |
404 | ||
405 | /* Synchronize to the input stream by waiting for the FID bit to be | |
406 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. | |
35f02a68 | 407 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
408 | * frame will always be in sync. |
409 | * | |
35f02a68 | 410 | * If the device doesn't toggle the FID bit, invert stream->last_fid |
c0efd232 LP |
411 | * when the EOF bit is set to force synchronisation on the next packet. |
412 | */ | |
413 | if (buf->state != UVC_BUF_STATE_ACTIVE) { | |
310fe524 LP |
414 | struct timespec ts; |
415 | ||
35f02a68 | 416 | if (fid == stream->last_fid) { |
c0efd232 LP |
417 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " |
418 | "sync).\n"); | |
35f02a68 | 419 | if ((stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && |
c0efd232 | 420 | (data[1] & UVC_STREAM_EOF)) |
35f02a68 | 421 | stream->last_fid ^= UVC_STREAM_FID; |
c0efd232 LP |
422 | return -ENODATA; |
423 | } | |
424 | ||
310fe524 LP |
425 | if (uvc_clock_param == CLOCK_MONOTONIC) |
426 | ktime_get_ts(&ts); | |
427 | else | |
428 | ktime_get_real_ts(&ts); | |
429 | ||
430 | buf->buf.timestamp.tv_sec = ts.tv_sec; | |
431 | buf->buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; | |
432 | ||
c0efd232 LP |
433 | /* TODO: Handle PTS and SCR. */ |
434 | buf->state = UVC_BUF_STATE_ACTIVE; | |
435 | } | |
436 | ||
437 | /* Mark the buffer as done if we're at the beginning of a new frame. | |
438 | * End of frame detection is better implemented by checking the EOF | |
439 | * bit (FID bit toggling is delayed by one frame compared to the EOF | |
440 | * bit), but some devices don't set the bit at end of frame (and the | |
441 | * last payload can be lost anyway). We thus must check if the FID has | |
442 | * been toggled. | |
443 | * | |
35f02a68 | 444 | * stream->last_fid is initialized to -1, so the first isochronous |
c0efd232 LP |
445 | * frame will never trigger an end of frame detection. |
446 | * | |
447 | * Empty buffers (bytesused == 0) don't trigger end of frame detection | |
448 | * as it doesn't make sense to return an empty buffer. This also | |
2c2d264b | 449 | * avoids detecting end of frame conditions at FID toggling if the |
c0efd232 LP |
450 | * previous payload had the EOF bit set. |
451 | */ | |
35f02a68 | 452 | if (fid != stream->last_fid && buf->buf.bytesused != 0) { |
c0efd232 LP |
453 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " |
454 | "toggled).\n"); | |
d7c0d439 | 455 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
456 | return -EAGAIN; |
457 | } | |
458 | ||
35f02a68 | 459 | stream->last_fid = fid; |
c0efd232 LP |
460 | |
461 | return data[0]; | |
462 | } | |
463 | ||
35f02a68 | 464 | static void uvc_video_decode_data(struct uvc_streaming *stream, |
c0efd232 LP |
465 | struct uvc_buffer *buf, const __u8 *data, int len) |
466 | { | |
35f02a68 | 467 | struct uvc_video_queue *queue = &stream->queue; |
c0efd232 LP |
468 | unsigned int maxlen, nbytes; |
469 | void *mem; | |
470 | ||
471 | if (len <= 0) | |
472 | return; | |
473 | ||
474 | /* Copy the video data to the buffer. */ | |
475 | maxlen = buf->buf.length - buf->buf.bytesused; | |
476 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; | |
477 | nbytes = min((unsigned int)len, maxlen); | |
478 | memcpy(mem, data, nbytes); | |
479 | buf->buf.bytesused += nbytes; | |
480 | ||
481 | /* Complete the current frame if the buffer size was exceeded. */ | |
482 | if (len > maxlen) { | |
483 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); | |
d7c0d439 | 484 | buf->state = UVC_BUF_STATE_READY; |
c0efd232 LP |
485 | } |
486 | } | |
487 | ||
35f02a68 | 488 | static void uvc_video_decode_end(struct uvc_streaming *stream, |
c0efd232 LP |
489 | struct uvc_buffer *buf, const __u8 *data, int len) |
490 | { | |
491 | /* Mark the buffer as done if the EOF marker is set. */ | |
492 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { | |
493 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); | |
494 | if (data[0] == len) | |
495 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); | |
d7c0d439 | 496 | buf->state = UVC_BUF_STATE_READY; |
35f02a68 LP |
497 | if (stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) |
498 | stream->last_fid ^= UVC_STREAM_FID; | |
c0efd232 LP |
499 | } |
500 | } | |
501 | ||
2c2d264b LP |
502 | /* Video payload encoding is handled by uvc_video_encode_header() and |
503 | * uvc_video_encode_data(). Only bulk transfers are currently supported. | |
504 | * | |
505 | * uvc_video_encode_header is called at the start of a payload. It adds header | |
506 | * data to the transfer buffer and returns the header size. As the only known | |
507 | * UVC output device transfers a whole frame in a single payload, the EOF bit | |
508 | * is always set in the header. | |
509 | * | |
510 | * uvc_video_encode_data is called for every URB and copies the data from the | |
511 | * video buffer to the transfer buffer. | |
512 | */ | |
35f02a68 | 513 | static int uvc_video_encode_header(struct uvc_streaming *stream, |
ff924203 LP |
514 | struct uvc_buffer *buf, __u8 *data, int len) |
515 | { | |
516 | data[0] = 2; /* Header length */ | |
517 | data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF | |
35f02a68 | 518 | | (stream->last_fid & UVC_STREAM_FID); |
ff924203 LP |
519 | return 2; |
520 | } | |
521 | ||
35f02a68 | 522 | static int uvc_video_encode_data(struct uvc_streaming *stream, |
ff924203 LP |
523 | struct uvc_buffer *buf, __u8 *data, int len) |
524 | { | |
35f02a68 | 525 | struct uvc_video_queue *queue = &stream->queue; |
ff924203 LP |
526 | unsigned int nbytes; |
527 | void *mem; | |
528 | ||
529 | /* Copy video data to the URB buffer. */ | |
530 | mem = queue->mem + buf->buf.m.offset + queue->buf_used; | |
531 | nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used); | |
35f02a68 | 532 | nbytes = min(stream->bulk.max_payload_size - stream->bulk.payload_size, |
ff924203 LP |
533 | nbytes); |
534 | memcpy(data, mem, nbytes); | |
535 | ||
536 | queue->buf_used += nbytes; | |
537 | ||
538 | return nbytes; | |
539 | } | |
540 | ||
c0efd232 LP |
541 | /* ------------------------------------------------------------------------ |
542 | * URB handling | |
543 | */ | |
544 | ||
545 | /* | |
546 | * Completion handler for video URBs. | |
547 | */ | |
35f02a68 LP |
548 | static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream, |
549 | struct uvc_buffer *buf) | |
c0efd232 LP |
550 | { |
551 | u8 *mem; | |
552 | int ret, i; | |
553 | ||
554 | for (i = 0; i < urb->number_of_packets; ++i) { | |
555 | if (urb->iso_frame_desc[i].status < 0) { | |
556 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " | |
557 | "lost (%d).\n", urb->iso_frame_desc[i].status); | |
558 | continue; | |
559 | } | |
560 | ||
561 | /* Decode the payload header. */ | |
562 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
563 | do { | |
35f02a68 | 564 | ret = uvc_video_decode_start(stream, buf, mem, |
c0efd232 LP |
565 | urb->iso_frame_desc[i].actual_length); |
566 | if (ret == -EAGAIN) | |
35f02a68 LP |
567 | buf = uvc_queue_next_buffer(&stream->queue, |
568 | buf); | |
c0efd232 LP |
569 | } while (ret == -EAGAIN); |
570 | ||
571 | if (ret < 0) | |
572 | continue; | |
573 | ||
574 | /* Decode the payload data. */ | |
35f02a68 | 575 | uvc_video_decode_data(stream, buf, mem + ret, |
c0efd232 LP |
576 | urb->iso_frame_desc[i].actual_length - ret); |
577 | ||
578 | /* Process the header again. */ | |
35f02a68 | 579 | uvc_video_decode_end(stream, buf, mem, |
08ebd003 | 580 | urb->iso_frame_desc[i].actual_length); |
c0efd232 | 581 | |
d7c0d439 | 582 | if (buf->state == UVC_BUF_STATE_READY) |
35f02a68 | 583 | buf = uvc_queue_next_buffer(&stream->queue, buf); |
c0efd232 LP |
584 | } |
585 | } | |
586 | ||
35f02a68 LP |
587 | static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream, |
588 | struct uvc_buffer *buf) | |
c0efd232 LP |
589 | { |
590 | u8 *mem; | |
591 | int len, ret; | |
592 | ||
c90e7779 LP |
593 | if (urb->actual_length == 0) |
594 | return; | |
595 | ||
c0efd232 LP |
596 | mem = urb->transfer_buffer; |
597 | len = urb->actual_length; | |
35f02a68 | 598 | stream->bulk.payload_size += len; |
c0efd232 LP |
599 | |
600 | /* If the URB is the first of its payload, decode and save the | |
601 | * header. | |
602 | */ | |
35f02a68 | 603 | if (stream->bulk.header_size == 0 && !stream->bulk.skip_payload) { |
c0efd232 | 604 | do { |
35f02a68 | 605 | ret = uvc_video_decode_start(stream, buf, mem, len); |
c0efd232 | 606 | if (ret == -EAGAIN) |
35f02a68 LP |
607 | buf = uvc_queue_next_buffer(&stream->queue, |
608 | buf); | |
c0efd232 LP |
609 | } while (ret == -EAGAIN); |
610 | ||
611 | /* If an error occured skip the rest of the payload. */ | |
612 | if (ret < 0 || buf == NULL) { | |
35f02a68 | 613 | stream->bulk.skip_payload = 1; |
f8dd4af6 | 614 | } else { |
35f02a68 LP |
615 | memcpy(stream->bulk.header, mem, ret); |
616 | stream->bulk.header_size = ret; | |
c0efd232 | 617 | |
f8dd4af6 LP |
618 | mem += ret; |
619 | len -= ret; | |
620 | } | |
c0efd232 LP |
621 | } |
622 | ||
623 | /* The buffer queue might have been cancelled while a bulk transfer | |
624 | * was in progress, so we can reach here with buf equal to NULL. Make | |
625 | * sure buf is never dereferenced if NULL. | |
626 | */ | |
627 | ||
628 | /* Process video data. */ | |
35f02a68 LP |
629 | if (!stream->bulk.skip_payload && buf != NULL) |
630 | uvc_video_decode_data(stream, buf, mem, len); | |
c0efd232 LP |
631 | |
632 | /* Detect the payload end by a URB smaller than the maximum size (or | |
633 | * a payload size equal to the maximum) and process the header again. | |
634 | */ | |
635 | if (urb->actual_length < urb->transfer_buffer_length || | |
35f02a68 LP |
636 | stream->bulk.payload_size >= stream->bulk.max_payload_size) { |
637 | if (!stream->bulk.skip_payload && buf != NULL) { | |
638 | uvc_video_decode_end(stream, buf, stream->bulk.header, | |
639 | stream->bulk.payload_size); | |
d7c0d439 | 640 | if (buf->state == UVC_BUF_STATE_READY) |
35f02a68 LP |
641 | buf = uvc_queue_next_buffer(&stream->queue, |
642 | buf); | |
c0efd232 LP |
643 | } |
644 | ||
35f02a68 LP |
645 | stream->bulk.header_size = 0; |
646 | stream->bulk.skip_payload = 0; | |
647 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
648 | } |
649 | } | |
650 | ||
35f02a68 LP |
651 | static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream, |
652 | struct uvc_buffer *buf) | |
ff924203 LP |
653 | { |
654 | u8 *mem = urb->transfer_buffer; | |
35f02a68 | 655 | int len = stream->urb_size, ret; |
ff924203 LP |
656 | |
657 | if (buf == NULL) { | |
658 | urb->transfer_buffer_length = 0; | |
659 | return; | |
660 | } | |
661 | ||
662 | /* If the URB is the first of its payload, add the header. */ | |
35f02a68 LP |
663 | if (stream->bulk.header_size == 0) { |
664 | ret = uvc_video_encode_header(stream, buf, mem, len); | |
665 | stream->bulk.header_size = ret; | |
666 | stream->bulk.payload_size += ret; | |
ff924203 LP |
667 | mem += ret; |
668 | len -= ret; | |
669 | } | |
670 | ||
671 | /* Process video data. */ | |
35f02a68 | 672 | ret = uvc_video_encode_data(stream, buf, mem, len); |
ff924203 | 673 | |
35f02a68 | 674 | stream->bulk.payload_size += ret; |
ff924203 LP |
675 | len -= ret; |
676 | ||
35f02a68 LP |
677 | if (buf->buf.bytesused == stream->queue.buf_used || |
678 | stream->bulk.payload_size == stream->bulk.max_payload_size) { | |
679 | if (buf->buf.bytesused == stream->queue.buf_used) { | |
680 | stream->queue.buf_used = 0; | |
d7c0d439 | 681 | buf->state = UVC_BUF_STATE_READY; |
35f02a68 LP |
682 | uvc_queue_next_buffer(&stream->queue, buf); |
683 | stream->last_fid ^= UVC_STREAM_FID; | |
ff924203 LP |
684 | } |
685 | ||
35f02a68 LP |
686 | stream->bulk.header_size = 0; |
687 | stream->bulk.payload_size = 0; | |
ff924203 LP |
688 | } |
689 | ||
35f02a68 | 690 | urb->transfer_buffer_length = stream->urb_size - len; |
ff924203 LP |
691 | } |
692 | ||
c0efd232 LP |
693 | static void uvc_video_complete(struct urb *urb) |
694 | { | |
35f02a68 LP |
695 | struct uvc_streaming *stream = urb->context; |
696 | struct uvc_video_queue *queue = &stream->queue; | |
c0efd232 LP |
697 | struct uvc_buffer *buf = NULL; |
698 | unsigned long flags; | |
699 | int ret; | |
700 | ||
701 | switch (urb->status) { | |
702 | case 0: | |
703 | break; | |
704 | ||
705 | default: | |
706 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " | |
707 | "completion handler.\n", urb->status); | |
708 | ||
709 | case -ENOENT: /* usb_kill_urb() called. */ | |
35f02a68 | 710 | if (stream->frozen) |
c0efd232 LP |
711 | return; |
712 | ||
713 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
714 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
715 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); | |
716 | return; | |
717 | } | |
718 | ||
719 | spin_lock_irqsave(&queue->irqlock, flags); | |
720 | if (!list_empty(&queue->irqqueue)) | |
721 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, | |
722 | queue); | |
723 | spin_unlock_irqrestore(&queue->irqlock, flags); | |
724 | ||
35f02a68 | 725 | stream->decode(urb, stream, buf); |
c0efd232 LP |
726 | |
727 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
728 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", | |
729 | ret); | |
730 | } | |
731 | } | |
732 | ||
e01117c8 LP |
733 | /* |
734 | * Free transfer buffers. | |
735 | */ | |
35f02a68 | 736 | static void uvc_free_urb_buffers(struct uvc_streaming *stream) |
e01117c8 LP |
737 | { |
738 | unsigned int i; | |
739 | ||
740 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
741 | if (stream->urb_buffer[i]) { |
742 | usb_buffer_free(stream->dev->udev, stream->urb_size, | |
743 | stream->urb_buffer[i], stream->urb_dma[i]); | |
744 | stream->urb_buffer[i] = NULL; | |
e01117c8 LP |
745 | } |
746 | } | |
747 | ||
35f02a68 | 748 | stream->urb_size = 0; |
e01117c8 LP |
749 | } |
750 | ||
751 | /* | |
752 | * Allocate transfer buffers. This function can be called with buffers | |
753 | * already allocated when resuming from suspend, in which case it will | |
754 | * return without touching the buffers. | |
755 | * | |
efdc8a95 LP |
756 | * Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the |
757 | * system is too low on memory try successively smaller numbers of packets | |
758 | * until allocation succeeds. | |
759 | * | |
760 | * Return the number of allocated packets on success or 0 when out of memory. | |
e01117c8 | 761 | */ |
35f02a68 | 762 | static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, |
efdc8a95 | 763 | unsigned int size, unsigned int psize, gfp_t gfp_flags) |
e01117c8 | 764 | { |
efdc8a95 | 765 | unsigned int npackets; |
e01117c8 LP |
766 | unsigned int i; |
767 | ||
768 | /* Buffers are already allocated, bail out. */ | |
35f02a68 LP |
769 | if (stream->urb_size) |
770 | return stream->urb_size / psize; | |
e01117c8 | 771 | |
efdc8a95 LP |
772 | /* Compute the number of packets. Bulk endpoints might transfer UVC |
773 | * payloads accross multiple URBs. | |
774 | */ | |
775 | npackets = DIV_ROUND_UP(size, psize); | |
776 | if (npackets > UVC_MAX_PACKETS) | |
777 | npackets = UVC_MAX_PACKETS; | |
778 | ||
779 | /* Retry allocations until one succeed. */ | |
780 | for (; npackets > 1; npackets /= 2) { | |
781 | for (i = 0; i < UVC_URBS; ++i) { | |
fd1b6bbb | 782 | stream->urb_size = psize * npackets; |
35f02a68 | 783 | stream->urb_buffer[i] = usb_buffer_alloc( |
fd1b6bbb | 784 | stream->dev->udev, stream->urb_size, |
35f02a68 LP |
785 | gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]); |
786 | if (!stream->urb_buffer[i]) { | |
787 | uvc_free_urb_buffers(stream); | |
efdc8a95 LP |
788 | break; |
789 | } | |
790 | } | |
791 | ||
792 | if (i == UVC_URBS) { | |
663a4192 LP |
793 | uvc_trace(UVC_TRACE_VIDEO, "Allocated %u URB buffers " |
794 | "of %ux%u bytes each.\n", UVC_URBS, npackets, | |
795 | psize); | |
efdc8a95 | 796 | return npackets; |
e01117c8 LP |
797 | } |
798 | } | |
799 | ||
663a4192 LP |
800 | uvc_trace(UVC_TRACE_VIDEO, "Failed to allocate URB buffers (%u bytes " |
801 | "per packet).\n", psize); | |
e01117c8 LP |
802 | return 0; |
803 | } | |
804 | ||
c0efd232 LP |
805 | /* |
806 | * Uninitialize isochronous/bulk URBs and free transfer buffers. | |
807 | */ | |
35f02a68 | 808 | static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) |
c0efd232 LP |
809 | { |
810 | struct urb *urb; | |
811 | unsigned int i; | |
812 | ||
813 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
814 | urb = stream->urb[i]; |
815 | if (urb == NULL) | |
c0efd232 LP |
816 | continue; |
817 | ||
818 | usb_kill_urb(urb); | |
c0efd232 | 819 | usb_free_urb(urb); |
35f02a68 | 820 | stream->urb[i] = NULL; |
c0efd232 | 821 | } |
e01117c8 LP |
822 | |
823 | if (free_buffers) | |
35f02a68 | 824 | uvc_free_urb_buffers(stream); |
c0efd232 LP |
825 | } |
826 | ||
827 | /* | |
828 | * Initialize isochronous URBs and allocate transfer buffers. The packet size | |
829 | * is given by the endpoint. | |
830 | */ | |
35f02a68 | 831 | static int uvc_init_video_isoc(struct uvc_streaming *stream, |
29135878 | 832 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
833 | { |
834 | struct urb *urb; | |
835 | unsigned int npackets, i, j; | |
efdc8a95 LP |
836 | u16 psize; |
837 | u32 size; | |
c0efd232 | 838 | |
c0efd232 LP |
839 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
840 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
35f02a68 | 841 | size = stream->ctrl.dwMaxVideoFrameSize; |
c0efd232 | 842 | |
35f02a68 | 843 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 LP |
844 | if (npackets == 0) |
845 | return -ENOMEM; | |
c0efd232 LP |
846 | |
847 | size = npackets * psize; | |
848 | ||
849 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 850 | urb = usb_alloc_urb(npackets, gfp_flags); |
c0efd232 | 851 | if (urb == NULL) { |
35f02a68 | 852 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
853 | return -ENOMEM; |
854 | } | |
855 | ||
35f02a68 LP |
856 | urb->dev = stream->dev->udev; |
857 | urb->context = stream; | |
858 | urb->pipe = usb_rcvisocpipe(stream->dev->udev, | |
c0efd232 LP |
859 | ep->desc.bEndpointAddress); |
860 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; | |
861 | urb->interval = ep->desc.bInterval; | |
35f02a68 LP |
862 | urb->transfer_buffer = stream->urb_buffer[i]; |
863 | urb->transfer_dma = stream->urb_dma[i]; | |
c0efd232 LP |
864 | urb->complete = uvc_video_complete; |
865 | urb->number_of_packets = npackets; | |
866 | urb->transfer_buffer_length = size; | |
867 | ||
868 | for (j = 0; j < npackets; ++j) { | |
869 | urb->iso_frame_desc[j].offset = j * psize; | |
870 | urb->iso_frame_desc[j].length = psize; | |
871 | } | |
872 | ||
35f02a68 | 873 | stream->urb[i] = urb; |
c0efd232 LP |
874 | } |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | /* | |
880 | * Initialize bulk URBs and allocate transfer buffers. The packet size is | |
881 | * given by the endpoint. | |
882 | */ | |
35f02a68 | 883 | static int uvc_init_video_bulk(struct uvc_streaming *stream, |
29135878 | 884 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
c0efd232 LP |
885 | { |
886 | struct urb *urb; | |
efdc8a95 LP |
887 | unsigned int npackets, pipe, i; |
888 | u16 psize; | |
889 | u32 size; | |
890 | ||
c0efd232 | 891 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; |
35f02a68 LP |
892 | size = stream->ctrl.dwMaxPayloadTransferSize; |
893 | stream->bulk.max_payload_size = size; | |
c0efd232 | 894 | |
35f02a68 | 895 | npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags); |
efdc8a95 | 896 | if (npackets == 0) |
e01117c8 LP |
897 | return -ENOMEM; |
898 | ||
efdc8a95 LP |
899 | size = npackets * psize; |
900 | ||
ff924203 | 901 | if (usb_endpoint_dir_in(&ep->desc)) |
35f02a68 | 902 | pipe = usb_rcvbulkpipe(stream->dev->udev, |
ff924203 LP |
903 | ep->desc.bEndpointAddress); |
904 | else | |
35f02a68 | 905 | pipe = usb_sndbulkpipe(stream->dev->udev, |
ff924203 LP |
906 | ep->desc.bEndpointAddress); |
907 | ||
35f02a68 | 908 | if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) |
ff924203 | 909 | size = 0; |
c0efd232 LP |
910 | |
911 | for (i = 0; i < UVC_URBS; ++i) { | |
29135878 | 912 | urb = usb_alloc_urb(0, gfp_flags); |
c0efd232 | 913 | if (urb == NULL) { |
35f02a68 | 914 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
915 | return -ENOMEM; |
916 | } | |
917 | ||
35f02a68 LP |
918 | usb_fill_bulk_urb(urb, stream->dev->udev, pipe, |
919 | stream->urb_buffer[i], size, uvc_video_complete, | |
920 | stream); | |
c0efd232 | 921 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
35f02a68 | 922 | urb->transfer_dma = stream->urb_dma[i]; |
c0efd232 | 923 | |
35f02a68 | 924 | stream->urb[i] = urb; |
c0efd232 LP |
925 | } |
926 | ||
927 | return 0; | |
928 | } | |
929 | ||
930 | /* | |
931 | * Initialize isochronous/bulk URBs and allocate transfer buffers. | |
932 | */ | |
35f02a68 | 933 | static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags) |
c0efd232 | 934 | { |
35f02a68 | 935 | struct usb_interface *intf = stream->intf; |
2c4d9de8 LP |
936 | struct usb_host_endpoint *ep; |
937 | unsigned int i; | |
c0efd232 LP |
938 | int ret; |
939 | ||
35f02a68 LP |
940 | stream->last_fid = -1; |
941 | stream->bulk.header_size = 0; | |
942 | stream->bulk.skip_payload = 0; | |
943 | stream->bulk.payload_size = 0; | |
c0efd232 LP |
944 | |
945 | if (intf->num_altsetting > 1) { | |
2c4d9de8 LP |
946 | struct usb_host_endpoint *best_ep = NULL; |
947 | unsigned int best_psize = 3 * 1024; | |
948 | unsigned int bandwidth; | |
949 | unsigned int uninitialized_var(altsetting); | |
950 | int intfnum = stream->intfnum; | |
951 | ||
c0efd232 | 952 | /* Isochronous endpoint, select the alternate setting. */ |
35f02a68 | 953 | bandwidth = stream->ctrl.dwMaxPayloadTransferSize; |
c0efd232 LP |
954 | |
955 | if (bandwidth == 0) { | |
663a4192 LP |
956 | uvc_trace(UVC_TRACE_VIDEO, "Device requested null " |
957 | "bandwidth, defaulting to lowest.\n"); | |
c0efd232 | 958 | bandwidth = 1; |
663a4192 LP |
959 | } else { |
960 | uvc_trace(UVC_TRACE_VIDEO, "Device requested %u " | |
961 | "B/frame bandwidth.\n", bandwidth); | |
c0efd232 LP |
962 | } |
963 | ||
964 | for (i = 0; i < intf->num_altsetting; ++i) { | |
2c4d9de8 LP |
965 | struct usb_host_interface *alts; |
966 | unsigned int psize; | |
967 | ||
c0efd232 LP |
968 | alts = &intf->altsetting[i]; |
969 | ep = uvc_find_endpoint(alts, | |
35f02a68 | 970 | stream->header.bEndpointAddress); |
c0efd232 LP |
971 | if (ep == NULL) |
972 | continue; | |
973 | ||
974 | /* Check if the bandwidth is high enough. */ | |
975 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); | |
976 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); | |
2c4d9de8 LP |
977 | if (psize >= bandwidth && psize <= best_psize) { |
978 | altsetting = i; | |
979 | best_psize = psize; | |
980 | best_ep = ep; | |
981 | } | |
c0efd232 LP |
982 | } |
983 | ||
2c4d9de8 | 984 | if (best_ep == NULL) { |
663a4192 LP |
985 | uvc_trace(UVC_TRACE_VIDEO, "No fast enough alt setting " |
986 | "for requested bandwidth.\n"); | |
c0efd232 | 987 | return -EIO; |
663a4192 | 988 | } |
c0efd232 | 989 | |
2c4d9de8 LP |
990 | uvc_trace(UVC_TRACE_VIDEO, "Selecting alternate setting %u " |
991 | "(%u B/frame bandwidth).\n", altsetting, best_psize); | |
992 | ||
993 | ret = usb_set_interface(stream->dev->udev, intfnum, altsetting); | |
35f02a68 | 994 | if (ret < 0) |
c0efd232 LP |
995 | return ret; |
996 | ||
2c4d9de8 | 997 | ret = uvc_init_video_isoc(stream, best_ep, gfp_flags); |
c0efd232 LP |
998 | } else { |
999 | /* Bulk endpoint, proceed to URB initialization. */ | |
1000 | ep = uvc_find_endpoint(&intf->altsetting[0], | |
35f02a68 | 1001 | stream->header.bEndpointAddress); |
c0efd232 LP |
1002 | if (ep == NULL) |
1003 | return -EIO; | |
1004 | ||
35f02a68 | 1005 | ret = uvc_init_video_bulk(stream, ep, gfp_flags); |
c0efd232 LP |
1006 | } |
1007 | ||
1008 | if (ret < 0) | |
1009 | return ret; | |
1010 | ||
1011 | /* Submit the URBs. */ | |
1012 | for (i = 0; i < UVC_URBS; ++i) { | |
35f02a68 LP |
1013 | ret = usb_submit_urb(stream->urb[i], gfp_flags); |
1014 | if (ret < 0) { | |
c0efd232 LP |
1015 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
1016 | "(%d).\n", i, ret); | |
35f02a68 | 1017 | uvc_uninit_video(stream, 1); |
c0efd232 LP |
1018 | return ret; |
1019 | } | |
1020 | } | |
1021 | ||
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | /* -------------------------------------------------------------------------- | |
1026 | * Suspend/resume | |
1027 | */ | |
1028 | ||
1029 | /* | |
1030 | * Stop streaming without disabling the video queue. | |
1031 | * | |
1032 | * To let userspace applications resume without trouble, we must not touch the | |
1033 | * video buffers in any way. We mark the device as frozen to make sure the URB | |
1034 | * completion handler won't try to cancel the queue when we kill the URBs. | |
1035 | */ | |
35f02a68 | 1036 | int uvc_video_suspend(struct uvc_streaming *stream) |
c0efd232 | 1037 | { |
35f02a68 | 1038 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1039 | return 0; |
1040 | ||
35f02a68 LP |
1041 | stream->frozen = 1; |
1042 | uvc_uninit_video(stream, 0); | |
1043 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
c0efd232 LP |
1044 | return 0; |
1045 | } | |
1046 | ||
1047 | /* | |
2c2d264b | 1048 | * Reconfigure the video interface and restart streaming if it was enabled |
c0efd232 LP |
1049 | * before suspend. |
1050 | * | |
1051 | * If an error occurs, disable the video queue. This will wake all pending | |
1052 | * buffers, making sure userspace applications are notified of the problem | |
1053 | * instead of waiting forever. | |
1054 | */ | |
35f02a68 | 1055 | int uvc_video_resume(struct uvc_streaming *stream) |
c0efd232 LP |
1056 | { |
1057 | int ret; | |
1058 | ||
35f02a68 | 1059 | stream->frozen = 0; |
c0efd232 | 1060 | |
35f02a68 LP |
1061 | ret = uvc_commit_video(stream, &stream->ctrl); |
1062 | if (ret < 0) { | |
1063 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1064 | return ret; |
1065 | } | |
1066 | ||
35f02a68 | 1067 | if (!uvc_queue_streaming(&stream->queue)) |
c0efd232 LP |
1068 | return 0; |
1069 | ||
35f02a68 LP |
1070 | ret = uvc_init_video(stream, GFP_NOIO); |
1071 | if (ret < 0) | |
1072 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1073 | |
1074 | return ret; | |
1075 | } | |
1076 | ||
1077 | /* ------------------------------------------------------------------------ | |
1078 | * Video device | |
1079 | */ | |
1080 | ||
1081 | /* | |
2c2d264b LP |
1082 | * Initialize the UVC video device by switching to alternate setting 0 and |
1083 | * retrieve the default format. | |
c0efd232 LP |
1084 | * |
1085 | * Some cameras (namely the Fuji Finepix) set the format and frame | |
1086 | * indexes to zero. The UVC standard doesn't clearly make this a spec | |
1087 | * violation, so try to silently fix the values if possible. | |
1088 | * | |
1089 | * This function is called before registering the device with V4L. | |
1090 | */ | |
35f02a68 | 1091 | int uvc_video_init(struct uvc_streaming *stream) |
c0efd232 | 1092 | { |
35f02a68 | 1093 | struct uvc_streaming_control *probe = &stream->ctrl; |
c0efd232 LP |
1094 | struct uvc_format *format = NULL; |
1095 | struct uvc_frame *frame = NULL; | |
1096 | unsigned int i; | |
1097 | int ret; | |
1098 | ||
35f02a68 | 1099 | if (stream->nformats == 0) { |
c0efd232 LP |
1100 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); |
1101 | return -EINVAL; | |
1102 | } | |
1103 | ||
35f02a68 LP |
1104 | atomic_set(&stream->active, 0); |
1105 | ||
1106 | /* Initialize the video buffers queue. */ | |
1107 | uvc_queue_init(&stream->queue, stream->type); | |
1108 | ||
c0efd232 LP |
1109 | /* Alternate setting 0 should be the default, yet the XBox Live Vision |
1110 | * Cam (and possibly other devices) crash or otherwise misbehave if | |
1111 | * they don't receive a SET_INTERFACE request before any other video | |
1112 | * control request. | |
1113 | */ | |
35f02a68 | 1114 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); |
c0efd232 | 1115 | |
72362422 LP |
1116 | /* Set the streaming probe control with default streaming parameters |
1117 | * retrieved from the device. Webcams that don't suport GET_DEF | |
1118 | * requests on the probe control will just keep their current streaming | |
1119 | * parameters. | |
c0efd232 | 1120 | */ |
35f02a68 LP |
1121 | if (uvc_get_video_ctrl(stream, probe, 1, UVC_GET_DEF) == 0) |
1122 | uvc_set_video_ctrl(stream, probe, 1); | |
72362422 LP |
1123 | |
1124 | /* Initialize the streaming parameters with the probe control current | |
1125 | * value. This makes sure SET_CUR requests on the streaming commit | |
1126 | * control will always use values retrieved from a successful GET_CUR | |
1127 | * request on the probe control, as required by the UVC specification. | |
1128 | */ | |
35f02a68 | 1129 | ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); |
b482d923 | 1130 | if (ret < 0) |
c0efd232 LP |
1131 | return ret; |
1132 | ||
1133 | /* Check if the default format descriptor exists. Use the first | |
1134 | * available format otherwise. | |
1135 | */ | |
35f02a68 LP |
1136 | for (i = stream->nformats; i > 0; --i) { |
1137 | format = &stream->format[i-1]; | |
c0efd232 LP |
1138 | if (format->index == probe->bFormatIndex) |
1139 | break; | |
1140 | } | |
1141 | ||
1142 | if (format->nframes == 0) { | |
1143 | uvc_printk(KERN_INFO, "No frame descriptor found for the " | |
1144 | "default format.\n"); | |
1145 | return -EINVAL; | |
1146 | } | |
1147 | ||
1148 | /* Zero bFrameIndex might be correct. Stream-based formats (including | |
1149 | * MPEG-2 TS and DV) do not support frames but have a dummy frame | |
1150 | * descriptor with bFrameIndex set to zero. If the default frame | |
078f8947 | 1151 | * descriptor is not found, use the first available frame. |
c0efd232 LP |
1152 | */ |
1153 | for (i = format->nframes; i > 0; --i) { | |
1154 | frame = &format->frame[i-1]; | |
1155 | if (frame->bFrameIndex == probe->bFrameIndex) | |
1156 | break; | |
1157 | } | |
1158 | ||
c0efd232 LP |
1159 | probe->bFormatIndex = format->index; |
1160 | probe->bFrameIndex = frame->bFrameIndex; | |
c0efd232 | 1161 | |
35f02a68 LP |
1162 | stream->cur_format = format; |
1163 | stream->cur_frame = frame; | |
c0efd232 LP |
1164 | |
1165 | /* Select the video decoding function */ | |
35f02a68 LP |
1166 | if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { |
1167 | if (stream->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) | |
1168 | stream->decode = uvc_video_decode_isight; | |
1169 | else if (stream->intf->num_altsetting > 1) | |
1170 | stream->decode = uvc_video_decode_isoc; | |
ff924203 | 1171 | else |
35f02a68 | 1172 | stream->decode = uvc_video_decode_bulk; |
ff924203 | 1173 | } else { |
35f02a68 LP |
1174 | if (stream->intf->num_altsetting == 1) |
1175 | stream->decode = uvc_video_encode_bulk; | |
ff924203 LP |
1176 | else { |
1177 | uvc_printk(KERN_INFO, "Isochronous endpoints are not " | |
1178 | "supported for video output devices.\n"); | |
1179 | return -EINVAL; | |
1180 | } | |
1181 | } | |
c0efd232 LP |
1182 | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * Enable or disable the video stream. | |
1188 | */ | |
35f02a68 | 1189 | int uvc_video_enable(struct uvc_streaming *stream, int enable) |
c0efd232 LP |
1190 | { |
1191 | int ret; | |
1192 | ||
1193 | if (!enable) { | |
35f02a68 LP |
1194 | uvc_uninit_video(stream, 1); |
1195 | usb_set_interface(stream->dev->udev, stream->intfnum, 0); | |
1196 | uvc_queue_enable(&stream->queue, 0); | |
c0efd232 LP |
1197 | return 0; |
1198 | } | |
1199 | ||
35f02a68 | 1200 | if ((stream->cur_format->flags & UVC_FMT_FLAG_COMPRESSED) || |
0fbd8ee6 | 1201 | uvc_no_drop_param) |
35f02a68 | 1202 | stream->queue.flags &= ~UVC_QUEUE_DROP_INCOMPLETE; |
d63beb9e | 1203 | else |
35f02a68 | 1204 | stream->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE; |
d63beb9e | 1205 | |
35f02a68 LP |
1206 | ret = uvc_queue_enable(&stream->queue, 1); |
1207 | if (ret < 0) | |
c0efd232 LP |
1208 | return ret; |
1209 | ||
23867b25 | 1210 | /* Commit the streaming parameters. */ |
35f02a68 LP |
1211 | ret = uvc_commit_video(stream, &stream->ctrl); |
1212 | if (ret < 0) | |
23867b25 LP |
1213 | return ret; |
1214 | ||
35f02a68 | 1215 | return uvc_init_video(stream, GFP_KERNEL); |
c0efd232 | 1216 | } |
f87086e3 | 1217 |