1 /*
2 * uvc_driver.c -- USB Video Class driver
3 *
4 * Copyright (C) 2005-2010
5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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 /*
15 * This driver aims to support video input and ouput devices compliant with the
16 * 'USB Video Class' specification.
17 *
18 * The driver doesn't support the deprecated v4l1 interface. It implements the
19 * mmap capture method only, and doesn't do any image format conversion in
20 * software. If your user-space application doesn't support YUYV or MJPEG, fix
21 * it :-). Please note that the MJPEG data have been stripped from their
22 * Huffman tables (DHT marker), you will need to add it back if your JPEG
23 * codec can't handle MJPEG data.
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/list.h>
28 #include <linux/module.h>
29 #include <linux/slab.h>
30 #include <linux/usb.h>
31 #include <linux/videodev2.h>
32 #include <linux/vmalloc.h>
33 #include <linux/wait.h>
34 #include <linux/version.h>
35 #include <asm/atomic.h>
36 #include <asm/unaligned.h>
37
38 #include <media/v4l2-common.h>
39
40 #include "uvcvideo.h"
41
42 #define DRIVER_AUTHOR "Laurent Pinchart " \
43 "<laurent.pinchart@ideasonboard.com>"
44 #define DRIVER_DESC "USB Video Class driver"
45
46 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
47 unsigned int uvc_no_drop_param;
48 static unsigned int uvc_quirks_param = -1;
49 unsigned int uvc_trace_param;
50 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
51
52 /* ------------------------------------------------------------------------
53 * Video formats
54 */
55
56 static struct uvc_format_desc uvc_fmts[] = {
57 {
58 .name = "YUV 4:2:2 (YUYV)",
59 .guid = UVC_GUID_FORMAT_YUY2,
60 .fcc = V4L2_PIX_FMT_YUYV,
61 },
62 {
63 .name = "YUV 4:2:2 (YUYV)",
64 .guid = UVC_GUID_FORMAT_YUY2_ISIGHT,
65 .fcc = V4L2_PIX_FMT_YUYV,
66 },
67 {
68 .name = "YUV 4:2:0 (NV12)",
69 .guid = UVC_GUID_FORMAT_NV12,
70 .fcc = V4L2_PIX_FMT_NV12,
71 },
72 {
73 .name = "MJPEG",
74 .guid = UVC_GUID_FORMAT_MJPEG,
75 .fcc = V4L2_PIX_FMT_MJPEG,
76 },
77 {
78 .name = "YVU 4:2:0 (YV12)",
79 .guid = UVC_GUID_FORMAT_YV12,
80 .fcc = V4L2_PIX_FMT_YVU420,
81 },
82 {
83 .name = "YUV 4:2:0 (I420)",
84 .guid = UVC_GUID_FORMAT_I420,
85 .fcc = V4L2_PIX_FMT_YUV420,
86 },
87 {
88 .name = "YUV 4:2:0 (M420)",
89 .guid = UVC_GUID_FORMAT_M420,
90 .fcc = V4L2_PIX_FMT_M420,
91 },
92 {
93 .name = "YUV 4:2:2 (UYVY)",
94 .guid = UVC_GUID_FORMAT_UYVY,
95 .fcc = V4L2_PIX_FMT_UYVY,
96 },
97 {
98 .name = "Greyscale (8-bit)",
99 .guid = UVC_GUID_FORMAT_Y800,
100 .fcc = V4L2_PIX_FMT_GREY,
101 },
102 {
103 .name = "Greyscale (16-bit)",
104 .guid = UVC_GUID_FORMAT_Y16,
105 .fcc = V4L2_PIX_FMT_Y16,
106 },
107 {
108 .name = "RGB Bayer",
109 .guid = UVC_GUID_FORMAT_BY8,
110 .fcc = V4L2_PIX_FMT_SBGGR8,
111 },
112 {
113 .name = "RGB565",
114 .guid = UVC_GUID_FORMAT_RGBP,
115 .fcc = V4L2_PIX_FMT_RGB565,
116 },
117 {
118 .name = "H.264",
119 .guid = UVC_GUID_FORMAT_H264,
120 .fcc = V4L2_PIX_FMT_H264,
121 },
122 };
123
124 /* ------------------------------------------------------------------------
125 * Utility functions
126 */
127
uvc_find_endpoint(struct usb_host_interface * alts,__u8 epaddr)128 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
129 __u8 epaddr)
130 {
131 struct usb_host_endpoint *ep;
132 unsigned int i;
133
134 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
135 ep = &alts->endpoint[i];
136 if (ep->desc.bEndpointAddress == epaddr)
137 return ep;
138 }
139
140 return NULL;
141 }
142
uvc_format_by_guid(const __u8 guid[16])143 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
144 {
145 unsigned int len = ARRAY_SIZE(uvc_fmts);
146 unsigned int i;
147
148 for (i = 0; i < len; ++i) {
149 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
150 return &uvc_fmts[i];
151 }
152
153 return NULL;
154 }
155
uvc_colorspace(const __u8 primaries)156 static __u32 uvc_colorspace(const __u8 primaries)
157 {
158 static const __u8 colorprimaries[] = {
159 0,
160 V4L2_COLORSPACE_SRGB,
161 V4L2_COLORSPACE_470_SYSTEM_M,
162 V4L2_COLORSPACE_470_SYSTEM_BG,
163 V4L2_COLORSPACE_SMPTE170M,
164 V4L2_COLORSPACE_SMPTE240M,
165 };
166
167 if (primaries < ARRAY_SIZE(colorprimaries))
168 return colorprimaries[primaries];
169
170 return 0;
171 }
172
173 /* Simplify a fraction using a simple continued fraction decomposition. The
174 * idea here is to convert fractions such as 333333/10000000 to 1/30 using
175 * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
176 * arbitrary parameters to remove non-significative terms from the simple
177 * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
178 * respectively seems to give nice results.
179 */
uvc_simplify_fraction(uint32_t * numerator,uint32_t * denominator,unsigned int n_terms,unsigned int threshold)180 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
181 unsigned int n_terms, unsigned int threshold)
182 {
183 uint32_t *an;
184 uint32_t x, y, r;
185 unsigned int i, n;
186
187 an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
188 if (an == NULL)
189 return;
190
191 /* Convert the fraction to a simple continued fraction. See
192 * http://mathforum.org/dr.math/faq/faq.fractions.html
193 * Stop if the current term is bigger than or equal to the given
194 * threshold.
195 */
196 x = *numerator;
197 y = *denominator;
198
199 for (n = 0; n < n_terms && y != 0; ++n) {
200 an[n] = x / y;
201 if (an[n] >= threshold) {
202 if (n < 2)
203 n++;
204 break;
205 }
206
207 r = x - an[n] * y;
208 x = y;
209 y = r;
210 }
211
212 /* Expand the simple continued fraction back to an integer fraction. */
213 x = 0;
214 y = 1;
215
216 for (i = n; i > 0; --i) {
217 r = y;
218 y = an[i-1] * y + x;
219 x = r;
220 }
221
222 *numerator = y;
223 *denominator = x;
224 kfree(an);
225 }
226
227 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
228 * to compute numerator / denominator * 10000000 using 32 bit fixed point
229 * arithmetic only.
230 */
uvc_fraction_to_interval(uint32_t numerator,uint32_t denominator)231 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
232 {
233 uint32_t multiplier;
234
235 /* Saturate the result if the operation would overflow. */
236 if (denominator == 0 ||
237 numerator/denominator >= ((uint32_t)-1)/10000000)
238 return (uint32_t)-1;
239
240 /* Divide both the denominator and the multiplier by two until
241 * numerator * multiplier doesn't overflow. If anyone knows a better
242 * algorithm please let me know.
243 */
244 multiplier = 10000000;
245 while (numerator > ((uint32_t)-1)/multiplier) {
246 multiplier /= 2;
247 denominator /= 2;
248 }
249
250 return denominator ? numerator * multiplier / denominator : 0;
251 }
252
253 /* ------------------------------------------------------------------------
254 * Terminal and unit management
255 */
256
uvc_entity_by_id(struct uvc_device * dev,int id)257 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
258 {
259 struct uvc_entity *entity;
260
261 list_for_each_entry(entity, &dev->entities, list) {
262 if (entity->id == id)
263 return entity;
264 }
265
266 return NULL;
267 }
268
uvc_entity_by_reference(struct uvc_device * dev,int id,struct uvc_entity * entity)269 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
270 int id, struct uvc_entity *entity)
271 {
272 unsigned int i;
273
274 if (entity == NULL)
275 entity = list_entry(&dev->entities, struct uvc_entity, list);
276
277 list_for_each_entry_continue(entity, &dev->entities, list) {
278 for (i = 0; i < entity->bNrInPins; ++i)
279 if (entity->baSourceID[i] == id)
280 return entity;
281 }
282
283 return NULL;
284 }
285
uvc_stream_by_id(struct uvc_device * dev,int id)286 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
287 {
288 struct uvc_streaming *stream;
289
290 list_for_each_entry(stream, &dev->streams, list) {
291 if (stream->header.bTerminalLink == id)
292 return stream;
293 }
294
295 return NULL;
296 }
297
298 /* ------------------------------------------------------------------------
299 * Descriptors parsing
300 */
301
uvc_parse_format(struct uvc_device * dev,struct uvc_streaming * streaming,struct uvc_format * format,__u32 ** intervals,unsigned char * buffer,int buflen)302 static int uvc_parse_format(struct uvc_device *dev,
303 struct uvc_streaming *streaming, struct uvc_format *format,
304 __u32 **intervals, unsigned char *buffer, int buflen)
305 {
306 struct usb_interface *intf = streaming->intf;
307 struct usb_host_interface *alts = intf->cur_altsetting;
308 struct uvc_format_desc *fmtdesc;
309 struct uvc_frame *frame;
310 const unsigned char *start = buffer;
311 unsigned int interval;
312 unsigned int i, n;
313 __u8 ftype;
314
315 format->type = buffer[2];
316 format->index = buffer[3];
317
318 switch (buffer[2]) {
319 case UVC_VS_FORMAT_UNCOMPRESSED:
320 case UVC_VS_FORMAT_FRAME_BASED:
321 n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
322 if (buflen < n) {
323 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
324 "interface %d FORMAT error\n",
325 dev->udev->devnum,
326 alts->desc.bInterfaceNumber);
327 return -EINVAL;
328 }
329
330 /* Find the format descriptor from its GUID. */
331 fmtdesc = uvc_format_by_guid(&buffer[5]);
332
333 if (fmtdesc != NULL) {
334 strlcpy(format->name, fmtdesc->name,
335 sizeof format->name);
336 format->fcc = fmtdesc->fcc;
337 } else {
338 uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
339 &buffer[5]);
340 snprintf(format->name, sizeof(format->name), "%pUl\n",
341 &buffer[5]);
342 format->fcc = 0;
343 }
344
345 format->bpp = buffer[21];
346 if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
347 ftype = UVC_VS_FRAME_UNCOMPRESSED;
348 } else {
349 ftype = UVC_VS_FRAME_FRAME_BASED;
350 if (buffer[27])
351 format->flags = UVC_FMT_FLAG_COMPRESSED;
352 }
353 break;
354
355 case UVC_VS_FORMAT_MJPEG:
356 if (buflen < 11) {
357 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
358 "interface %d FORMAT error\n",
359 dev->udev->devnum,
360 alts->desc.bInterfaceNumber);
361 return -EINVAL;
362 }
363
364 strlcpy(format->name, "MJPEG", sizeof format->name);
365 format->fcc = V4L2_PIX_FMT_MJPEG;
366 format->flags = UVC_FMT_FLAG_COMPRESSED;
367 format->bpp = 0;
368 ftype = UVC_VS_FRAME_MJPEG;
369 break;
370
371 case UVC_VS_FORMAT_DV:
372 if (buflen < 9) {
373 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
374 "interface %d FORMAT error\n",
375 dev->udev->devnum,
376 alts->desc.bInterfaceNumber);
377 return -EINVAL;
378 }
379
380 switch (buffer[8] & 0x7f) {
381 case 0:
382 strlcpy(format->name, "SD-DV", sizeof format->name);
383 break;
384 case 1:
385 strlcpy(format->name, "SDL-DV", sizeof format->name);
386 break;
387 case 2:
388 strlcpy(format->name, "HD-DV", sizeof format->name);
389 break;
390 default:
391 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
392 "interface %d: unknown DV format %u\n",
393 dev->udev->devnum,
394 alts->desc.bInterfaceNumber, buffer[8]);
395 return -EINVAL;
396 }
397
398 strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
399 sizeof format->name);
400
401 format->fcc = V4L2_PIX_FMT_DV;
402 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
403 format->bpp = 0;
404 ftype = 0;
405
406 /* Create a dummy frame descriptor. */
407 frame = &format->frame[0];
408 memset(&format->frame[0], 0, sizeof format->frame[0]);
409 frame->bFrameIntervalType = 1;
410 frame->dwDefaultFrameInterval = 1;
411 frame->dwFrameInterval = *intervals;
412 *(*intervals)++ = 1;
413 format->nframes = 1;
414 break;
415
416 case UVC_VS_FORMAT_MPEG2TS:
417 case UVC_VS_FORMAT_STREAM_BASED:
418 /* Not supported yet. */
419 default:
420 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
421 "interface %d unsupported format %u\n",
422 dev->udev->devnum, alts->desc.bInterfaceNumber,
423 buffer[2]);
424 return -EINVAL;
425 }
426
427 uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
428
429 buflen -= buffer[0];
430 buffer += buffer[0];
431
432 /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
433 * based formats have frame descriptors.
434 */
435 while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
436 buffer[2] == ftype) {
437 frame = &format->frame[format->nframes];
438 if (ftype != UVC_VS_FRAME_FRAME_BASED)
439 n = buflen > 25 ? buffer[25] : 0;
440 else
441 n = buflen > 21 ? buffer[21] : 0;
442
443 n = n ? n : 3;
444
445 if (buflen < 26 + 4*n) {
446 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
447 "interface %d FRAME error\n", dev->udev->devnum,
448 alts->desc.bInterfaceNumber);
449 return -EINVAL;
450 }
451
452 frame->bFrameIndex = buffer[3];
453 frame->bmCapabilities = buffer[4];
454 frame->wWidth = get_unaligned_le16(&buffer[5]);
455 frame->wHeight = get_unaligned_le16(&buffer[7]);
456 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
457 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
458 if (ftype != UVC_VS_FRAME_FRAME_BASED) {
459 frame->dwMaxVideoFrameBufferSize =
460 get_unaligned_le32(&buffer[17]);
461 frame->dwDefaultFrameInterval =
462 get_unaligned_le32(&buffer[21]);
463 frame->bFrameIntervalType = buffer[25];
464 } else {
465 frame->dwMaxVideoFrameBufferSize = 0;
466 frame->dwDefaultFrameInterval =
467 get_unaligned_le32(&buffer[17]);
468 frame->bFrameIntervalType = buffer[21];
469 }
470 frame->dwFrameInterval = *intervals;
471
472 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
473 * completely. Observed behaviours range from setting the
474 * value to 1.1x the actual frame size to hardwiring the
475 * 16 low bits to 0. This results in a higher than necessary
476 * memory usage as well as a wrong image size information. For
477 * uncompressed formats this can be fixed by computing the
478 * value from the frame size.
479 */
480 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
481 frame->dwMaxVideoFrameBufferSize = format->bpp
482 * frame->wWidth * frame->wHeight / 8;
483
484 /* Some bogus devices report dwMinFrameInterval equal to
485 * dwMaxFrameInterval and have dwFrameIntervalStep set to
486 * zero. Setting all null intervals to 1 fixes the problem and
487 * some other divisions by zero that could happen.
488 */
489 for (i = 0; i < n; ++i) {
490 interval = get_unaligned_le32(&buffer[26+4*i]);
491 *(*intervals)++ = interval ? interval : 1;
492 }
493
494 /* Make sure that the default frame interval stays between
495 * the boundaries.
496 */
497 n -= frame->bFrameIntervalType ? 1 : 2;
498 frame->dwDefaultFrameInterval =
499 min(frame->dwFrameInterval[n],
500 max(frame->dwFrameInterval[0],
501 frame->dwDefaultFrameInterval));
502
503 if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
504 frame->bFrameIntervalType = 1;
505 frame->dwFrameInterval[0] =
506 frame->dwDefaultFrameInterval;
507 }
508
509 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
510 frame->wWidth, frame->wHeight,
511 10000000/frame->dwDefaultFrameInterval,
512 (100000000/frame->dwDefaultFrameInterval)%10);
513
514 format->nframes++;
515 buflen -= buffer[0];
516 buffer += buffer[0];
517 }
518
519 if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
520 buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
521 buflen -= buffer[0];
522 buffer += buffer[0];
523 }
524
525 if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
526 buffer[2] == UVC_VS_COLORFORMAT) {
527 if (buflen < 6) {
528 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
529 "interface %d COLORFORMAT error\n",
530 dev->udev->devnum,
531 alts->desc.bInterfaceNumber);
532 return -EINVAL;
533 }
534
535 format->colorspace = uvc_colorspace(buffer[3]);
536
537 buflen -= buffer[0];
538 buffer += buffer[0];
539 }
540
541 return buffer - start;
542 }
543
uvc_parse_streaming(struct uvc_device * dev,struct usb_interface * intf)544 static int uvc_parse_streaming(struct uvc_device *dev,
545 struct usb_interface *intf)
546 {
547 struct uvc_streaming *streaming = NULL;
548 struct uvc_format *format;
549 struct uvc_frame *frame;
550 struct usb_host_interface *alts = &intf->altsetting[0];
551 unsigned char *_buffer, *buffer = alts->extra;
552 int _buflen, buflen = alts->extralen;
553 unsigned int nformats = 0, nframes = 0, nintervals = 0;
554 unsigned int size, i, n, p;
555 __u32 *interval;
556 __u16 psize;
557 int ret = -EINVAL;
558
559 if (intf->cur_altsetting->desc.bInterfaceSubClass
560 != UVC_SC_VIDEOSTREAMING) {
561 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
562 "video streaming interface\n", dev->udev->devnum,
563 intf->altsetting[0].desc.bInterfaceNumber);
564 return -EINVAL;
565 }
566
567 if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
568 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
569 "claimed\n", dev->udev->devnum,
570 intf->altsetting[0].desc.bInterfaceNumber);
571 return -EINVAL;
572 }
573
574 streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
575 if (streaming == NULL) {
576 usb_driver_release_interface(&uvc_driver.driver, intf);
577 return -EINVAL;
578 }
579
580 mutex_init(&streaming->mutex);
581 streaming->dev = dev;
582 streaming->intf = usb_get_intf(intf);
583 streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
584
585 /* The Pico iMage webcam has its class-specific interface descriptors
586 * after the endpoint descriptors.
587 */
588 if (buflen == 0) {
589 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
590 struct usb_host_endpoint *ep = &alts->endpoint[i];
591
592 if (ep->extralen == 0)
593 continue;
594
595 if (ep->extralen > 2 &&
596 ep->extra[1] == USB_DT_CS_INTERFACE) {
597 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
598 "from endpoint %u.\n", i);
599 buffer = alts->endpoint[i].extra;
600 buflen = alts->endpoint[i].extralen;
601 break;
602 }
603 }
604 }
605
606 /* Skip the standard interface descriptors. */
607 while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
608 buflen -= buffer[0];
609 buffer += buffer[0];
610 }
611
612 if (buflen <= 2) {
613 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
614 "interface descriptors found.\n");
615 goto error;
616 }
617
618 /* Parse the header descriptor. */
619 switch (buffer[2]) {
620 case UVC_VS_OUTPUT_HEADER:
621 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
622 size = 9;
623 break;
624
625 case UVC_VS_INPUT_HEADER:
626 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
627 size = 13;
628 break;
629
630 default:
631 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
632 "%d HEADER descriptor not found.\n", dev->udev->devnum,
633 alts->desc.bInterfaceNumber);
634 goto error;
635 }
636
637 p = buflen >= 4 ? buffer[3] : 0;
638 n = buflen >= size ? buffer[size-1] : 0;
639
640 if (buflen < size + p*n) {
641 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
642 "interface %d HEADER descriptor is invalid.\n",
643 dev->udev->devnum, alts->desc.bInterfaceNumber);
644 goto error;
645 }
646
647 streaming->header.bNumFormats = p;
648 streaming->header.bEndpointAddress = buffer[6];
649 if (buffer[2] == UVC_VS_INPUT_HEADER) {
650 streaming->header.bmInfo = buffer[7];
651 streaming->header.bTerminalLink = buffer[8];
652 streaming->header.bStillCaptureMethod = buffer[9];
653 streaming->header.bTriggerSupport = buffer[10];
654 streaming->header.bTriggerUsage = buffer[11];
655 } else {
656 streaming->header.bTerminalLink = buffer[7];
657 }
658 streaming->header.bControlSize = n;
659
660 streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
661 GFP_KERNEL);
662 if (streaming->header.bmaControls == NULL) {
663 ret = -ENOMEM;
664 goto error;
665 }
666
667 buflen -= buffer[0];
668 buffer += buffer[0];
669
670 _buffer = buffer;
671 _buflen = buflen;
672
673 /* Count the format and frame descriptors. */
674 while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
675 switch (_buffer[2]) {
676 case UVC_VS_FORMAT_UNCOMPRESSED:
677 case UVC_VS_FORMAT_MJPEG:
678 case UVC_VS_FORMAT_FRAME_BASED:
679 nformats++;
680 break;
681
682 case UVC_VS_FORMAT_DV:
683 /* DV format has no frame descriptor. We will create a
684 * dummy frame descriptor with a dummy frame interval.
685 */
686 nformats++;
687 nframes++;
688 nintervals++;
689 break;
690
691 case UVC_VS_FORMAT_MPEG2TS:
692 case UVC_VS_FORMAT_STREAM_BASED:
693 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
694 "interface %d FORMAT %u is not supported.\n",
695 dev->udev->devnum,
696 alts->desc.bInterfaceNumber, _buffer[2]);
697 break;
698
699 case UVC_VS_FRAME_UNCOMPRESSED:
700 case UVC_VS_FRAME_MJPEG:
701 nframes++;
702 if (_buflen > 25)
703 nintervals += _buffer[25] ? _buffer[25] : 3;
704 break;
705
706 case UVC_VS_FRAME_FRAME_BASED:
707 nframes++;
708 if (_buflen > 21)
709 nintervals += _buffer[21] ? _buffer[21] : 3;
710 break;
711 }
712
713 _buflen -= _buffer[0];
714 _buffer += _buffer[0];
715 }
716
717 if (nformats == 0) {
718 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
719 "%d has no supported formats defined.\n",
720 dev->udev->devnum, alts->desc.bInterfaceNumber);
721 goto error;
722 }
723
724 size = nformats * sizeof *format + nframes * sizeof *frame
725 + nintervals * sizeof *interval;
726 format = kzalloc(size, GFP_KERNEL);
727 if (format == NULL) {
728 ret = -ENOMEM;
729 goto error;
730 }
731
732 frame = (struct uvc_frame *)&format[nformats];
733 interval = (__u32 *)&frame[nframes];
734
735 streaming->format = format;
736 streaming->nformats = nformats;
737
738 /* Parse the format descriptors. */
739 while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
740 switch (buffer[2]) {
741 case UVC_VS_FORMAT_UNCOMPRESSED:
742 case UVC_VS_FORMAT_MJPEG:
743 case UVC_VS_FORMAT_DV:
744 case UVC_VS_FORMAT_FRAME_BASED:
745 format->frame = frame;
746 ret = uvc_parse_format(dev, streaming, format,
747 &interval, buffer, buflen);
748 if (ret < 0)
749 goto error;
750
751 frame += format->nframes;
752 format++;
753
754 buflen -= ret;
755 buffer += ret;
756 continue;
757
758 default:
759 break;
760 }
761
762 buflen -= buffer[0];
763 buffer += buffer[0];
764 }
765
766 if (buflen)
767 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
768 "%d has %u bytes of trailing descriptor garbage.\n",
769 dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
770
771 /* Parse the alternate settings to find the maximum bandwidth. */
772 for (i = 0; i < intf->num_altsetting; ++i) {
773 struct usb_host_endpoint *ep;
774 alts = &intf->altsetting[i];
775 ep = uvc_find_endpoint(alts,
776 streaming->header.bEndpointAddress);
777 if (ep == NULL)
778 continue;
779
780 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
781 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
782 if (psize > streaming->maxpsize)
783 streaming->maxpsize = psize;
784 }
785
786 list_add_tail(&streaming->list, &dev->streams);
787 return 0;
788
789 error:
790 usb_driver_release_interface(&uvc_driver.driver, intf);
791 usb_put_intf(intf);
792 kfree(streaming->format);
793 kfree(streaming->header.bmaControls);
794 kfree(streaming);
795 return ret;
796 }
797
uvc_alloc_entity(u16 type,u8 id,unsigned int num_pads,unsigned int extra_size)798 static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
799 unsigned int num_pads, unsigned int extra_size)
800 {
801 struct uvc_entity *entity;
802 unsigned int num_inputs;
803 unsigned int size;
804 unsigned int i;
805
806 extra_size = ALIGN(extra_size, sizeof(*entity->pads));
807 num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1;
808 size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
809 + num_inputs;
810 entity = kzalloc(size, GFP_KERNEL);
811 if (entity == NULL)
812 return NULL;
813
814 entity->id = id;
815 entity->type = type;
816
817 entity->num_links = 0;
818 entity->num_pads = num_pads;
819 entity->pads = ((void *)(entity + 1)) + extra_size;
820
821 for (i = 0; i < num_inputs; ++i)
822 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
823 if (!UVC_ENTITY_IS_OTERM(entity))
824 entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
825
826 entity->bNrInPins = num_inputs;
827 entity->baSourceID = (__u8 *)(&entity->pads[num_pads]);
828
829 return entity;
830 }
831
832 /* Parse vendor-specific extensions. */
uvc_parse_vendor_control(struct uvc_device * dev,const unsigned char * buffer,int buflen)833 static int uvc_parse_vendor_control(struct uvc_device *dev,
834 const unsigned char *buffer, int buflen)
835 {
836 struct usb_device *udev = dev->udev;
837 struct usb_host_interface *alts = dev->intf->cur_altsetting;
838 struct uvc_entity *unit;
839 unsigned int n, p;
840 int handled = 0;
841
842 switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
843 case 0x046d: /* Logitech */
844 if (buffer[1] != 0x41 || buffer[2] != 0x01)
845 break;
846
847 /* Logitech implements several vendor specific functions
848 * through vendor specific extension units (LXU).
849 *
850 * The LXU descriptors are similar to XU descriptors
851 * (see "USB Device Video Class for Video Devices", section
852 * 3.7.2.6 "Extension Unit Descriptor") with the following
853 * differences:
854 *
855 * ----------------------------------------------------------
856 * 0 bLength 1 Number
857 * Size of this descriptor, in bytes: 24+p+n*2
858 * ----------------------------------------------------------
859 * 23+p+n bmControlsType N Bitmap
860 * Individual bits in the set are defined:
861 * 0: Absolute
862 * 1: Relative
863 *
864 * This bitset is mapped exactly the same as bmControls.
865 * ----------------------------------------------------------
866 * 23+p+n*2 bReserved 1 Boolean
867 * ----------------------------------------------------------
868 * 24+p+n*2 iExtension 1 Index
869 * Index of a string descriptor that describes this
870 * extension unit.
871 * ----------------------------------------------------------
872 */
873 p = buflen >= 22 ? buffer[21] : 0;
874 n = buflen >= 25 + p ? buffer[22+p] : 0;
875
876 if (buflen < 25 + p + 2*n) {
877 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
878 "interface %d EXTENSION_UNIT error\n",
879 udev->devnum, alts->desc.bInterfaceNumber);
880 break;
881 }
882
883 unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
884 p + 1, 2*n);
885 if (unit == NULL)
886 return -ENOMEM;
887
888 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
889 unit->extension.bNumControls = buffer[20];
890 memcpy(unit->baSourceID, &buffer[22], p);
891 unit->extension.bControlSize = buffer[22+p];
892 unit->extension.bmControls = (__u8 *)unit + sizeof(*unit);
893 unit->extension.bmControlsType = (__u8 *)unit + sizeof(*unit)
894 + n;
895 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
896
897 if (buffer[24+p+2*n] != 0)
898 usb_string(udev, buffer[24+p+2*n], unit->name,
899 sizeof unit->name);
900 else
901 sprintf(unit->name, "Extension %u", buffer[3]);
902
903 list_add_tail(&unit->list, &dev->entities);
904 handled = 1;
905 break;
906 }
907
908 return handled;
909 }
910
uvc_parse_standard_control(struct uvc_device * dev,const unsigned char * buffer,int buflen)911 static int uvc_parse_standard_control(struct uvc_device *dev,
912 const unsigned char *buffer, int buflen)
913 {
914 struct usb_device *udev = dev->udev;
915 struct uvc_entity *unit, *term;
916 struct usb_interface *intf;
917 struct usb_host_interface *alts = dev->intf->cur_altsetting;
918 unsigned int i, n, p, len;
919 __u16 type;
920
921 switch (buffer[2]) {
922 case UVC_VC_HEADER:
923 n = buflen >= 12 ? buffer[11] : 0;
924
925 if (buflen < 12 || buflen < 12 + n) {
926 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
927 "interface %d HEADER error\n", udev->devnum,
928 alts->desc.bInterfaceNumber);
929 return -EINVAL;
930 }
931
932 dev->uvc_version = get_unaligned_le16(&buffer[3]);
933 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
934
935 /* Parse all USB Video Streaming interfaces. */
936 for (i = 0; i < n; ++i) {
937 intf = usb_ifnum_to_if(udev, buffer[12+i]);
938 if (intf == NULL) {
939 uvc_trace(UVC_TRACE_DESCR, "device %d "
940 "interface %d doesn't exists\n",
941 udev->devnum, i);
942 continue;
943 }
944
945 uvc_parse_streaming(dev, intf);
946 }
947 break;
948
949 case UVC_VC_INPUT_TERMINAL:
950 if (buflen < 8) {
951 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
952 "interface %d INPUT_TERMINAL error\n",
953 udev->devnum, alts->desc.bInterfaceNumber);
954 return -EINVAL;
955 }
956
957 /* Make sure the terminal type MSB is not null, otherwise it
958 * could be confused with a unit.
959 */
960 type = get_unaligned_le16(&buffer[4]);
961 if ((type & 0xff00) == 0) {
962 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
963 "interface %d INPUT_TERMINAL %d has invalid "
964 "type 0x%04x, skipping\n", udev->devnum,
965 alts->desc.bInterfaceNumber,
966 buffer[3], type);
967 return 0;
968 }
969
970 n = 0;
971 p = 0;
972 len = 8;
973
974 if (type == UVC_ITT_CAMERA) {
975 n = buflen >= 15 ? buffer[14] : 0;
976 len = 15;
977
978 } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
979 n = buflen >= 9 ? buffer[8] : 0;
980 p = buflen >= 10 + n ? buffer[9+n] : 0;
981 len = 10;
982 }
983
984 if (buflen < len + n + p) {
985 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
986 "interface %d INPUT_TERMINAL error\n",
987 udev->devnum, alts->desc.bInterfaceNumber);
988 return -EINVAL;
989 }
990
991 term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
992 1, n + p);
993 if (term == NULL)
994 return -ENOMEM;
995
996 if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
997 term->camera.bControlSize = n;
998 term->camera.bmControls = (__u8 *)term + sizeof *term;
999 term->camera.wObjectiveFocalLengthMin =
1000 get_unaligned_le16(&buffer[8]);
1001 term->camera.wObjectiveFocalLengthMax =
1002 get_unaligned_le16(&buffer[10]);
1003 term->camera.wOcularFocalLength =
1004 get_unaligned_le16(&buffer[12]);
1005 memcpy(term->camera.bmControls, &buffer[15], n);
1006 } else if (UVC_ENTITY_TYPE(term) ==
1007 UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1008 term->media.bControlSize = n;
1009 term->media.bmControls = (__u8 *)term + sizeof *term;
1010 term->media.bTransportModeSize = p;
1011 term->media.bmTransportModes = (__u8 *)term
1012 + sizeof *term + n;
1013 memcpy(term->media.bmControls, &buffer[9], n);
1014 memcpy(term->media.bmTransportModes, &buffer[10+n], p);
1015 }
1016
1017 if (buffer[7] != 0)
1018 usb_string(udev, buffer[7], term->name,
1019 sizeof term->name);
1020 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
1021 sprintf(term->name, "Camera %u", buffer[3]);
1022 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
1023 sprintf(term->name, "Media %u", buffer[3]);
1024 else
1025 sprintf(term->name, "Input %u", buffer[3]);
1026
1027 list_add_tail(&term->list, &dev->entities);
1028 break;
1029
1030 case UVC_VC_OUTPUT_TERMINAL:
1031 if (buflen < 9) {
1032 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1033 "interface %d OUTPUT_TERMINAL error\n",
1034 udev->devnum, alts->desc.bInterfaceNumber);
1035 return -EINVAL;
1036 }
1037
1038 /* Make sure the terminal type MSB is not null, otherwise it
1039 * could be confused with a unit.
1040 */
1041 type = get_unaligned_le16(&buffer[4]);
1042 if ((type & 0xff00) == 0) {
1043 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1044 "interface %d OUTPUT_TERMINAL %d has invalid "
1045 "type 0x%04x, skipping\n", udev->devnum,
1046 alts->desc.bInterfaceNumber, buffer[3], type);
1047 return 0;
1048 }
1049
1050 term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
1051 1, 0);
1052 if (term == NULL)
1053 return -ENOMEM;
1054
1055 memcpy(term->baSourceID, &buffer[7], 1);
1056
1057 if (buffer[8] != 0)
1058 usb_string(udev, buffer[8], term->name,
1059 sizeof term->name);
1060 else
1061 sprintf(term->name, "Output %u", buffer[3]);
1062
1063 list_add_tail(&term->list, &dev->entities);
1064 break;
1065
1066 case UVC_VC_SELECTOR_UNIT:
1067 p = buflen >= 5 ? buffer[4] : 0;
1068
1069 if (buflen < 5 || buflen < 6 + p) {
1070 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1071 "interface %d SELECTOR_UNIT error\n",
1072 udev->devnum, alts->desc.bInterfaceNumber);
1073 return -EINVAL;
1074 }
1075
1076 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
1077 if (unit == NULL)
1078 return -ENOMEM;
1079
1080 memcpy(unit->baSourceID, &buffer[5], p);
1081
1082 if (buffer[5+p] != 0)
1083 usb_string(udev, buffer[5+p], unit->name,
1084 sizeof unit->name);
1085 else
1086 sprintf(unit->name, "Selector %u", buffer[3]);
1087
1088 list_add_tail(&unit->list, &dev->entities);
1089 break;
1090
1091 case UVC_VC_PROCESSING_UNIT:
1092 n = buflen >= 8 ? buffer[7] : 0;
1093 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1094
1095 if (buflen < p + n) {
1096 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1097 "interface %d PROCESSING_UNIT error\n",
1098 udev->devnum, alts->desc.bInterfaceNumber);
1099 return -EINVAL;
1100 }
1101
1102 unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
1103 if (unit == NULL)
1104 return -ENOMEM;
1105
1106 memcpy(unit->baSourceID, &buffer[4], 1);
1107 unit->processing.wMaxMultiplier =
1108 get_unaligned_le16(&buffer[5]);
1109 unit->processing.bControlSize = buffer[7];
1110 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1111 memcpy(unit->processing.bmControls, &buffer[8], n);
1112 if (dev->uvc_version >= 0x0110)
1113 unit->processing.bmVideoStandards = buffer[9+n];
1114
1115 if (buffer[8+n] != 0)
1116 usb_string(udev, buffer[8+n], unit->name,
1117 sizeof unit->name);
1118 else
1119 sprintf(unit->name, "Processing %u", buffer[3]);
1120
1121 list_add_tail(&unit->list, &dev->entities);
1122 break;
1123
1124 case UVC_VC_EXTENSION_UNIT:
1125 p = buflen >= 22 ? buffer[21] : 0;
1126 n = buflen >= 24 + p ? buffer[22+p] : 0;
1127
1128 if (buflen < 24 + p + n) {
1129 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1130 "interface %d EXTENSION_UNIT error\n",
1131 udev->devnum, alts->desc.bInterfaceNumber);
1132 return -EINVAL;
1133 }
1134
1135 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
1136 if (unit == NULL)
1137 return -ENOMEM;
1138
1139 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1140 unit->extension.bNumControls = buffer[20];
1141 memcpy(unit->baSourceID, &buffer[22], p);
1142 unit->extension.bControlSize = buffer[22+p];
1143 unit->extension.bmControls = (__u8 *)unit + sizeof *unit;
1144 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1145
1146 if (buffer[23+p+n] != 0)
1147 usb_string(udev, buffer[23+p+n], unit->name,
1148 sizeof unit->name);
1149 else
1150 sprintf(unit->name, "Extension %u", buffer[3]);
1151
1152 list_add_tail(&unit->list, &dev->entities);
1153 break;
1154
1155 default:
1156 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1157 "descriptor (%u)\n", buffer[2]);
1158 break;
1159 }
1160
1161 return 0;
1162 }
1163
uvc_parse_control(struct uvc_device * dev)1164 static int uvc_parse_control(struct uvc_device *dev)
1165 {
1166 struct usb_host_interface *alts = dev->intf->cur_altsetting;
1167 unsigned char *buffer = alts->extra;
1168 int buflen = alts->extralen;
1169 int ret;
1170
1171 /* Parse the default alternate setting only, as the UVC specification
1172 * defines a single alternate setting, the default alternate setting
1173 * zero.
1174 */
1175
1176 while (buflen > 2) {
1177 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1178 buffer[1] != USB_DT_CS_INTERFACE)
1179 goto next_descriptor;
1180
1181 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1182 return ret;
1183
1184 next_descriptor:
1185 buflen -= buffer[0];
1186 buffer += buffer[0];
1187 }
1188
1189 /* Check if the optional status endpoint is present. Built-in iSight
1190 * webcams have an interrupt endpoint but spit proprietary data that
1191 * don't conform to the UVC status endpoint messages. Don't try to
1192 * handle the interrupt endpoint for those cameras.
1193 */
1194 if (alts->desc.bNumEndpoints == 1 &&
1195 !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1196 struct usb_host_endpoint *ep = &alts->endpoint[0];
1197 struct usb_endpoint_descriptor *desc = &ep->desc;
1198
1199 if (usb_endpoint_is_int_in(desc) &&
1200 le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1201 desc->bInterval != 0) {
1202 uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1203 "(addr %02x).\n", desc->bEndpointAddress);
1204 dev->int_ep = ep;
1205 }
1206 }
1207
1208 return 0;
1209 }
1210
1211 /* ------------------------------------------------------------------------
1212 * UVC device scan
1213 */
1214
1215 /*
1216 * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1217 * and containing the following units:
1218 *
1219 * - one or more Output Terminals (USB Streaming or Display)
1220 * - zero or one Processing Unit
1221 * - zero, one or more single-input Selector Units
1222 * - zero or one multiple-input Selector Units, provided all inputs are
1223 * connected to input terminals
1224 * - zero, one or mode single-input Extension Units
1225 * - one or more Input Terminals (Camera, External or USB Streaming)
1226 *
1227 * The terminal and units must match on of the following structures:
1228 *
1229 * ITT_*(0) -> +---------+ +---------+ +---------+ -> TT_STREAMING(0)
1230 * ... | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} | ...
1231 * ITT_*(n) -> +---------+ +---------+ +---------+ -> TT_STREAMING(n)
1232 *
1233 * +---------+ +---------+ -> OTT_*(0)
1234 * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} | ...
1235 * +---------+ +---------+ -> OTT_*(n)
1236 *
1237 * The Processing Unit and Extension Units can be in any order. Additional
1238 * Extension Units connected to the main chain as single-unit branches are
1239 * also supported. Single-input Selector Units are ignored.
1240 */
uvc_scan_chain_entity(struct uvc_video_chain * chain,struct uvc_entity * entity)1241 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
1242 struct uvc_entity *entity)
1243 {
1244 switch (UVC_ENTITY_TYPE(entity)) {
1245 case UVC_VC_EXTENSION_UNIT:
1246 if (uvc_trace_param & UVC_TRACE_PROBE)
1247 printk(" <- XU %d", entity->id);
1248
1249 if (entity->bNrInPins != 1) {
1250 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1251 "than 1 input pin.\n", entity->id);
1252 return -1;
1253 }
1254
1255 break;
1256
1257 case UVC_VC_PROCESSING_UNIT:
1258 if (uvc_trace_param & UVC_TRACE_PROBE)
1259 printk(" <- PU %d", entity->id);
1260
1261 if (chain->processing != NULL) {
1262 uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1263 "Processing Units in chain.\n");
1264 return -1;
1265 }
1266
1267 chain->processing = entity;
1268 break;
1269
1270 case UVC_VC_SELECTOR_UNIT:
1271 if (uvc_trace_param & UVC_TRACE_PROBE)
1272 printk(" <- SU %d", entity->id);
1273
1274 /* Single-input selector units are ignored. */
1275 if (entity->bNrInPins == 1)
1276 break;
1277
1278 if (chain->selector != NULL) {
1279 uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1280 "Units in chain.\n");
1281 return -1;
1282 }
1283
1284 chain->selector = entity;
1285 break;
1286
1287 case UVC_ITT_VENDOR_SPECIFIC:
1288 case UVC_ITT_CAMERA:
1289 case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1290 if (uvc_trace_param & UVC_TRACE_PROBE)
1291 printk(" <- IT %d\n", entity->id);
1292
1293 break;
1294
1295 case UVC_OTT_VENDOR_SPECIFIC:
1296 case UVC_OTT_DISPLAY:
1297 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1298 if (uvc_trace_param & UVC_TRACE_PROBE)
1299 printk(" OT %d", entity->id);
1300
1301 break;
1302
1303 case UVC_TT_STREAMING:
1304 if (UVC_ENTITY_IS_ITERM(entity)) {
1305 if (uvc_trace_param & UVC_TRACE_PROBE)
1306 printk(" <- IT %d\n", entity->id);
1307 } else {
1308 if (uvc_trace_param & UVC_TRACE_PROBE)
1309 printk(" OT %d", entity->id);
1310 }
1311
1312 break;
1313
1314 default:
1315 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1316 "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1317 return -1;
1318 }
1319
1320 list_add_tail(&entity->chain, &chain->entities);
1321 return 0;
1322 }
1323
uvc_scan_chain_forward(struct uvc_video_chain * chain,struct uvc_entity * entity,struct uvc_entity * prev)1324 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
1325 struct uvc_entity *entity, struct uvc_entity *prev)
1326 {
1327 struct uvc_entity *forward;
1328 int found;
1329
1330 /* Forward scan */
1331 forward = NULL;
1332 found = 0;
1333
1334 while (1) {
1335 forward = uvc_entity_by_reference(chain->dev, entity->id,
1336 forward);
1337 if (forward == NULL)
1338 break;
1339 if (forward == prev)
1340 continue;
1341
1342 switch (UVC_ENTITY_TYPE(forward)) {
1343 case UVC_VC_EXTENSION_UNIT:
1344 if (forward->bNrInPins != 1) {
1345 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
1346 "has more than 1 input pin.\n",
1347 entity->id);
1348 return -EINVAL;
1349 }
1350
1351 list_add_tail(&forward->chain, &chain->entities);
1352 if (uvc_trace_param & UVC_TRACE_PROBE) {
1353 if (!found)
1354 printk(" (->");
1355
1356 printk(" XU %d", forward->id);
1357 found = 1;
1358 }
1359 break;
1360
1361 case UVC_OTT_VENDOR_SPECIFIC:
1362 case UVC_OTT_DISPLAY:
1363 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1364 case UVC_TT_STREAMING:
1365 if (UVC_ENTITY_IS_ITERM(forward)) {
1366 uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1367 "terminal %u.\n", forward->id);
1368 return -EINVAL;
1369 }
1370
1371 list_add_tail(&forward->chain, &chain->entities);
1372 if (uvc_trace_param & UVC_TRACE_PROBE) {
1373 if (!found)
1374 printk(" (->");
1375
1376 printk(" OT %d", forward->id);
1377 found = 1;
1378 }
1379 break;
1380 }
1381 }
1382 if (found)
1383 printk(")");
1384
1385 return 0;
1386 }
1387
uvc_scan_chain_backward(struct uvc_video_chain * chain,struct uvc_entity ** _entity)1388 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
1389 struct uvc_entity **_entity)
1390 {
1391 struct uvc_entity *entity = *_entity;
1392 struct uvc_entity *term;
1393 int id = -EINVAL, i;
1394
1395 switch (UVC_ENTITY_TYPE(entity)) {
1396 case UVC_VC_EXTENSION_UNIT:
1397 case UVC_VC_PROCESSING_UNIT:
1398 id = entity->baSourceID[0];
1399 break;
1400
1401 case UVC_VC_SELECTOR_UNIT:
1402 /* Single-input selector units are ignored. */
1403 if (entity->bNrInPins == 1) {
1404 id = entity->baSourceID[0];
1405 break;
1406 }
1407
1408 if (uvc_trace_param & UVC_TRACE_PROBE)
1409 printk(" <- IT");
1410
1411 chain->selector = entity;
1412 for (i = 0; i < entity->bNrInPins; ++i) {
1413 id = entity->baSourceID[i];
1414 term = uvc_entity_by_id(chain->dev, id);
1415 if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1416 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1417 "input %d isn't connected to an "
1418 "input terminal\n", entity->id, i);
1419 return -1;
1420 }
1421
1422 if (uvc_trace_param & UVC_TRACE_PROBE)
1423 printk(" %d", term->id);
1424
1425 list_add_tail(&term->chain, &chain->entities);
1426 uvc_scan_chain_forward(chain, term, entity);
1427 }
1428
1429 if (uvc_trace_param & UVC_TRACE_PROBE)
1430 printk("\n");
1431
1432 id = 0;
1433 break;
1434
1435 case UVC_ITT_VENDOR_SPECIFIC:
1436 case UVC_ITT_CAMERA:
1437 case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1438 case UVC_OTT_VENDOR_SPECIFIC:
1439 case UVC_OTT_DISPLAY:
1440 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1441 case UVC_TT_STREAMING:
1442 id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
1443 break;
1444 }
1445
1446 if (id <= 0) {
1447 *_entity = NULL;
1448 return id;
1449 }
1450
1451 entity = uvc_entity_by_id(chain->dev, id);
1452 if (entity == NULL) {
1453 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1454 "unknown entity %d.\n", id);
1455 return -EINVAL;
1456 }
1457
1458 *_entity = entity;
1459 return 0;
1460 }
1461
uvc_scan_chain(struct uvc_video_chain * chain,struct uvc_entity * term)1462 static int uvc_scan_chain(struct uvc_video_chain *chain,
1463 struct uvc_entity *term)
1464 {
1465 struct uvc_entity *entity, *prev;
1466
1467 uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain:");
1468
1469 entity = term;
1470 prev = NULL;
1471
1472 while (entity != NULL) {
1473 /* Entity must not be part of an existing chain */
1474 if (entity->chain.next || entity->chain.prev) {
1475 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1476 "entity %d already in chain.\n", entity->id);
1477 return -EINVAL;
1478 }
1479
1480 /* Process entity */
1481 if (uvc_scan_chain_entity(chain, entity) < 0)
1482 return -EINVAL;
1483
1484 /* Forward scan */
1485 if (uvc_scan_chain_forward(chain, entity, prev) < 0)
1486 return -EINVAL;
1487
1488 /* Backward scan */
1489 prev = entity;
1490 if (uvc_scan_chain_backward(chain, &entity) < 0)
1491 return -EINVAL;
1492 }
1493
1494 return 0;
1495 }
1496
uvc_print_terms(struct list_head * terms,u16 dir,char * buffer)1497 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
1498 char *buffer)
1499 {
1500 struct uvc_entity *term;
1501 unsigned int nterms = 0;
1502 char *p = buffer;
1503
1504 list_for_each_entry(term, terms, chain) {
1505 if (!UVC_ENTITY_IS_TERM(term) ||
1506 UVC_TERM_DIRECTION(term) != dir)
1507 continue;
1508
1509 if (nterms)
1510 p += sprintf(p, ",");
1511 if (++nterms >= 4) {
1512 p += sprintf(p, "...");
1513 break;
1514 }
1515 p += sprintf(p, "%u", term->id);
1516 }
1517
1518 return p - buffer;
1519 }
1520
uvc_print_chain(struct uvc_video_chain * chain)1521 static const char *uvc_print_chain(struct uvc_video_chain *chain)
1522 {
1523 static char buffer[43];
1524 char *p = buffer;
1525
1526 p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
1527 p += sprintf(p, " -> ");
1528 uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
1529
1530 return buffer;
1531 }
1532
1533 /*
1534 * Scan the device for video chains and register video devices.
1535 *
1536 * Chains are scanned starting at their output terminals and walked backwards.
1537 */
uvc_scan_device(struct uvc_device * dev)1538 static int uvc_scan_device(struct uvc_device *dev)
1539 {
1540 struct uvc_video_chain *chain;
1541 struct uvc_entity *term;
1542
1543 list_for_each_entry(term, &dev->entities, list) {
1544 if (!UVC_ENTITY_IS_OTERM(term))
1545 continue;
1546
1547 /* If the terminal is already included in a chain, skip it.
1548 * This can happen for chains that have multiple output
1549 * terminals, where all output terminals beside the first one
1550 * will be inserted in the chain in forward scans.
1551 */
1552 if (term->chain.next || term->chain.prev)
1553 continue;
1554
1555 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1556 if (chain == NULL)
1557 return -ENOMEM;
1558
1559 INIT_LIST_HEAD(&chain->entities);
1560 mutex_init(&chain->ctrl_mutex);
1561 chain->dev = dev;
1562
1563 if (uvc_scan_chain(chain, term) < 0) {
1564 kfree(chain);
1565 continue;
1566 }
1567
1568 uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
1569 uvc_print_chain(chain));
1570
1571 list_add_tail(&chain->list, &dev->chains);
1572 }
1573
1574 if (list_empty(&dev->chains)) {
1575 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1576 return -1;
1577 }
1578
1579 return 0;
1580 }
1581
1582 /* ------------------------------------------------------------------------
1583 * Video device registration and unregistration
1584 */
1585
1586 /*
1587 * Delete the UVC device.
1588 *
1589 * Called by the kernel when the last reference to the uvc_device structure
1590 * is released.
1591 *
1592 * As this function is called after or during disconnect(), all URBs have
1593 * already been canceled by the USB core. There is no need to kill the
1594 * interrupt URB manually.
1595 */
uvc_delete(struct uvc_device * dev)1596 static void uvc_delete(struct uvc_device *dev)
1597 {
1598 struct list_head *p, *n;
1599
1600 usb_put_intf(dev->intf);
1601 usb_put_dev(dev->udev);
1602
1603 uvc_status_cleanup(dev);
1604 uvc_ctrl_cleanup_device(dev);
1605
1606 if (dev->vdev.dev)
1607 v4l2_device_unregister(&dev->vdev);
1608 #ifdef CONFIG_MEDIA_CONTROLLER
1609 if (media_devnode_is_registered(&dev->mdev.devnode))
1610 media_device_unregister(&dev->mdev);
1611 #endif
1612
1613 list_for_each_safe(p, n, &dev->chains) {
1614 struct uvc_video_chain *chain;
1615 chain = list_entry(p, struct uvc_video_chain, list);
1616 kfree(chain);
1617 }
1618
1619 list_for_each_safe(p, n, &dev->entities) {
1620 struct uvc_entity *entity;
1621 entity = list_entry(p, struct uvc_entity, list);
1622 #ifdef CONFIG_MEDIA_CONTROLLER
1623 uvc_mc_cleanup_entity(entity);
1624 #endif
1625 if (entity->vdev) {
1626 video_device_release(entity->vdev);
1627 entity->vdev = NULL;
1628 }
1629 kfree(entity);
1630 }
1631
1632 list_for_each_safe(p, n, &dev->streams) {
1633 struct uvc_streaming *streaming;
1634 streaming = list_entry(p, struct uvc_streaming, list);
1635 usb_driver_release_interface(&uvc_driver.driver,
1636 streaming->intf);
1637 usb_put_intf(streaming->intf);
1638 kfree(streaming->format);
1639 kfree(streaming->header.bmaControls);
1640 kfree(streaming);
1641 }
1642
1643 kfree(dev);
1644 }
1645
uvc_release(struct video_device * vdev)1646 static void uvc_release(struct video_device *vdev)
1647 {
1648 struct uvc_streaming *stream = video_get_drvdata(vdev);
1649 struct uvc_device *dev = stream->dev;
1650
1651 /* Decrement the registered streams count and delete the device when it
1652 * reaches zero.
1653 */
1654 if (atomic_dec_and_test(&dev->nstreams))
1655 uvc_delete(dev);
1656 }
1657
1658 /*
1659 * Unregister the video devices.
1660 */
uvc_unregister_video(struct uvc_device * dev)1661 static void uvc_unregister_video(struct uvc_device *dev)
1662 {
1663 struct uvc_streaming *stream;
1664
1665 /* Unregistering all video devices might result in uvc_delete() being
1666 * called from inside the loop if there's no open file handle. To avoid
1667 * that, increment the stream count before iterating over the streams
1668 * and decrement it when done.
1669 */
1670 atomic_inc(&dev->nstreams);
1671
1672 list_for_each_entry(stream, &dev->streams, list) {
1673 if (stream->vdev == NULL)
1674 continue;
1675
1676 video_unregister_device(stream->vdev);
1677 stream->vdev = NULL;
1678
1679 uvc_debugfs_cleanup_stream(stream);
1680 }
1681
1682 /* Decrement the stream count and call uvc_delete explicitly if there
1683 * are no stream left.
1684 */
1685 if (atomic_dec_and_test(&dev->nstreams))
1686 uvc_delete(dev);
1687 }
1688
uvc_register_video(struct uvc_device * dev,struct uvc_streaming * stream)1689 static int uvc_register_video(struct uvc_device *dev,
1690 struct uvc_streaming *stream)
1691 {
1692 struct video_device *vdev;
1693 int ret;
1694
1695 /* Initialize the streaming interface with default streaming
1696 * parameters.
1697 */
1698 ret = uvc_video_init(stream);
1699 if (ret < 0) {
1700 uvc_printk(KERN_ERR, "Failed to initialize the device "
1701 "(%d).\n", ret);
1702 return ret;
1703 }
1704
1705 uvc_debugfs_init_stream(stream);
1706
1707 /* Register the device with V4L. */
1708 vdev = video_device_alloc();
1709 if (vdev == NULL) {
1710 uvc_printk(KERN_ERR, "Failed to allocate video device (%d).\n",
1711 ret);
1712 return -ENOMEM;
1713 }
1714
1715 /* We already hold a reference to dev->udev. The video device will be
1716 * unregistered before the reference is released, so we don't need to
1717 * get another one.
1718 */
1719 vdev->v4l2_dev = &dev->vdev;
1720 vdev->fops = &uvc_fops;
1721 vdev->release = uvc_release;
1722 strlcpy(vdev->name, dev->name, sizeof vdev->name);
1723
1724 /* Set the driver data before calling video_register_device, otherwise
1725 * uvc_v4l2_open might race us.
1726 */
1727 stream->vdev = vdev;
1728 video_set_drvdata(vdev, stream);
1729
1730 ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
1731 if (ret < 0) {
1732 uvc_printk(KERN_ERR, "Failed to register video device (%d).\n",
1733 ret);
1734 stream->vdev = NULL;
1735 video_device_release(vdev);
1736 return ret;
1737 }
1738
1739 atomic_inc(&dev->nstreams);
1740 return 0;
1741 }
1742
1743 /*
1744 * Register all video devices in all chains.
1745 */
uvc_register_terms(struct uvc_device * dev,struct uvc_video_chain * chain)1746 static int uvc_register_terms(struct uvc_device *dev,
1747 struct uvc_video_chain *chain)
1748 {
1749 struct uvc_streaming *stream;
1750 struct uvc_entity *term;
1751 int ret;
1752
1753 list_for_each_entry(term, &chain->entities, chain) {
1754 if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
1755 continue;
1756
1757 stream = uvc_stream_by_id(dev, term->id);
1758 if (stream == NULL) {
1759 uvc_printk(KERN_INFO, "No streaming interface found "
1760 "for terminal %u.", term->id);
1761 continue;
1762 }
1763
1764 stream->chain = chain;
1765 ret = uvc_register_video(dev, stream);
1766 if (ret < 0)
1767 return ret;
1768
1769 term->vdev = stream->vdev;
1770 }
1771
1772 return 0;
1773 }
1774
uvc_register_chains(struct uvc_device * dev)1775 static int uvc_register_chains(struct uvc_device *dev)
1776 {
1777 struct uvc_video_chain *chain;
1778 int ret;
1779
1780 list_for_each_entry(chain, &dev->chains, list) {
1781 ret = uvc_register_terms(dev, chain);
1782 if (ret < 0)
1783 return ret;
1784
1785 #ifdef CONFIG_MEDIA_CONTROLLER
1786 ret = uvc_mc_register_entities(chain);
1787 if (ret < 0) {
1788 uvc_printk(KERN_INFO, "Failed to register entites "
1789 "(%d).\n", ret);
1790 }
1791 #endif
1792 }
1793
1794 return 0;
1795 }
1796
1797 /* ------------------------------------------------------------------------
1798 * USB probe, disconnect, suspend and resume
1799 */
1800
uvc_probe(struct usb_interface * intf,const struct usb_device_id * id)1801 static int uvc_probe(struct usb_interface *intf,
1802 const struct usb_device_id *id)
1803 {
1804 struct usb_device *udev = interface_to_usbdev(intf);
1805 struct uvc_device *dev;
1806 int ret;
1807
1808 if (id->idVendor && id->idProduct)
1809 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1810 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1811 id->idProduct);
1812 else
1813 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1814 udev->devpath);
1815
1816 /* Allocate memory for the device and initialize it. */
1817 if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1818 return -ENOMEM;
1819
1820 INIT_LIST_HEAD(&dev->entities);
1821 INIT_LIST_HEAD(&dev->chains);
1822 INIT_LIST_HEAD(&dev->streams);
1823 atomic_set(&dev->nstreams, 0);
1824 atomic_set(&dev->users, 0);
1825 atomic_set(&dev->nmappings, 0);
1826
1827 dev->udev = usb_get_dev(udev);
1828 dev->intf = usb_get_intf(intf);
1829 dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1830 dev->quirks = (uvc_quirks_param == -1)
1831 ? id->driver_info : uvc_quirks_param;
1832
1833 if (udev->product != NULL)
1834 strlcpy(dev->name, udev->product, sizeof dev->name);
1835 else
1836 snprintf(dev->name, sizeof dev->name,
1837 "UVC Camera (%04x:%04x)",
1838 le16_to_cpu(udev->descriptor.idVendor),
1839 le16_to_cpu(udev->descriptor.idProduct));
1840
1841 /* Parse the Video Class control descriptor. */
1842 if (uvc_parse_control(dev) < 0) {
1843 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1844 "descriptors.\n");
1845 goto error;
1846 }
1847
1848 uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
1849 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1850 udev->product ? udev->product : "<unnamed>",
1851 le16_to_cpu(udev->descriptor.idVendor),
1852 le16_to_cpu(udev->descriptor.idProduct));
1853
1854 if (dev->quirks != id->driver_info) {
1855 uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
1856 "parameter for testing purpose.\n", dev->quirks);
1857 uvc_printk(KERN_INFO, "Please report required quirks to the "
1858 "linux-uvc-devel mailing list.\n");
1859 }
1860
1861 /* Register the media and V4L2 devices. */
1862 #ifdef CONFIG_MEDIA_CONTROLLER
1863 dev->mdev.dev = &intf->dev;
1864 strlcpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
1865 if (udev->serial)
1866 strlcpy(dev->mdev.serial, udev->serial,
1867 sizeof(dev->mdev.serial));
1868 strcpy(dev->mdev.bus_info, udev->devpath);
1869 dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
1870 dev->mdev.driver_version = LINUX_VERSION_CODE;
1871 if (media_device_register(&dev->mdev) < 0)
1872 goto error;
1873
1874 dev->vdev.mdev = &dev->mdev;
1875 #endif
1876 if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
1877 goto error;
1878
1879 /* Initialize controls. */
1880 if (uvc_ctrl_init_device(dev) < 0)
1881 goto error;
1882
1883 /* Scan the device for video chains. */
1884 if (uvc_scan_device(dev) < 0)
1885 goto error;
1886
1887 /* Register video device nodes. */
1888 if (uvc_register_chains(dev) < 0)
1889 goto error;
1890
1891 /* Save our data pointer in the interface data. */
1892 usb_set_intfdata(intf, dev);
1893
1894 /* Initialize the interrupt URB. */
1895 if ((ret = uvc_status_init(dev)) < 0) {
1896 uvc_printk(KERN_INFO, "Unable to initialize the status "
1897 "endpoint (%d), status interrupt will not be "
1898 "supported.\n", ret);
1899 }
1900
1901 uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1902 usb_enable_autosuspend(udev);
1903 return 0;
1904
1905 error:
1906 uvc_unregister_video(dev);
1907 return -ENODEV;
1908 }
1909
uvc_disconnect(struct usb_interface * intf)1910 static void uvc_disconnect(struct usb_interface *intf)
1911 {
1912 struct uvc_device *dev = usb_get_intfdata(intf);
1913
1914 /* Set the USB interface data to NULL. This can be done outside the
1915 * lock, as there's no other reader.
1916 */
1917 usb_set_intfdata(intf, NULL);
1918
1919 if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1920 UVC_SC_VIDEOSTREAMING)
1921 return;
1922
1923 dev->state |= UVC_DEV_DISCONNECTED;
1924
1925 uvc_unregister_video(dev);
1926 }
1927
uvc_suspend(struct usb_interface * intf,pm_message_t message)1928 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1929 {
1930 struct uvc_device *dev = usb_get_intfdata(intf);
1931 struct uvc_streaming *stream;
1932
1933 uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1934 intf->cur_altsetting->desc.bInterfaceNumber);
1935
1936 /* Controls are cached on the fly so they don't need to be saved. */
1937 if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1938 UVC_SC_VIDEOCONTROL)
1939 return uvc_status_suspend(dev);
1940
1941 list_for_each_entry(stream, &dev->streams, list) {
1942 if (stream->intf == intf)
1943 return uvc_video_suspend(stream);
1944 }
1945
1946 uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
1947 "mismatch.\n");
1948 return -EINVAL;
1949 }
1950
__uvc_resume(struct usb_interface * intf,int reset)1951 static int __uvc_resume(struct usb_interface *intf, int reset)
1952 {
1953 struct uvc_device *dev = usb_get_intfdata(intf);
1954 struct uvc_streaming *stream;
1955
1956 uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1957 intf->cur_altsetting->desc.bInterfaceNumber);
1958
1959 if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1960 UVC_SC_VIDEOCONTROL) {
1961 if (reset) {
1962 int ret = uvc_ctrl_resume_device(dev);
1963
1964 if (ret < 0)
1965 return ret;
1966 }
1967
1968 return uvc_status_resume(dev);
1969 }
1970
1971 list_for_each_entry(stream, &dev->streams, list) {
1972 if (stream->intf == intf)
1973 return uvc_video_resume(stream, reset);
1974 }
1975
1976 uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
1977 "mismatch.\n");
1978 return -EINVAL;
1979 }
1980
uvc_resume(struct usb_interface * intf)1981 static int uvc_resume(struct usb_interface *intf)
1982 {
1983 return __uvc_resume(intf, 0);
1984 }
1985
uvc_reset_resume(struct usb_interface * intf)1986 static int uvc_reset_resume(struct usb_interface *intf)
1987 {
1988 return __uvc_resume(intf, 1);
1989 }
1990
1991 /* ------------------------------------------------------------------------
1992 * Module parameters
1993 */
1994
uvc_clock_param_get(char * buffer,struct kernel_param * kp)1995 static int uvc_clock_param_get(char *buffer, struct kernel_param *kp)
1996 {
1997 if (uvc_clock_param == CLOCK_MONOTONIC)
1998 return sprintf(buffer, "CLOCK_MONOTONIC");
1999 else
2000 return sprintf(buffer, "CLOCK_REALTIME");
2001 }
2002
uvc_clock_param_set(const char * val,struct kernel_param * kp)2003 static int uvc_clock_param_set(const char *val, struct kernel_param *kp)
2004 {
2005 if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
2006 val += strlen("clock_");
2007
2008 if (strcasecmp(val, "monotonic") == 0)
2009 uvc_clock_param = CLOCK_MONOTONIC;
2010 else if (strcasecmp(val, "realtime") == 0)
2011 uvc_clock_param = CLOCK_REALTIME;
2012 else
2013 return -EINVAL;
2014
2015 return 0;
2016 }
2017
2018 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
2019 &uvc_clock_param, S_IRUGO|S_IWUSR);
2020 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
2021 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
2022 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
2023 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2024 MODULE_PARM_DESC(quirks, "Forced device quirks");
2025 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2026 MODULE_PARM_DESC(trace, "Trace level bitmask");
2027 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
2028 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
2029
2030 /* ------------------------------------------------------------------------
2031 * Driver initialization and cleanup
2032 */
2033
2034 /*
2035 * The Logitech cameras listed below have their interface class set to
2036 * VENDOR_SPEC because they don't announce themselves as UVC devices, even
2037 * though they are compliant.
2038 */
2039 static struct usb_device_id uvc_ids[] = {
2040 /* LogiLink Wireless Webcam */
2041 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2042 | USB_DEVICE_ID_MATCH_INT_INFO,
2043 .idVendor = 0x0416,
2044 .idProduct = 0xa91a,
2045 .bInterfaceClass = USB_CLASS_VIDEO,
2046 .bInterfaceSubClass = 1,
2047 .bInterfaceProtocol = 0,
2048 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2049 /* Genius eFace 2025 */
2050 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2051 | USB_DEVICE_ID_MATCH_INT_INFO,
2052 .idVendor = 0x0458,
2053 .idProduct = 0x706e,
2054 .bInterfaceClass = USB_CLASS_VIDEO,
2055 .bInterfaceSubClass = 1,
2056 .bInterfaceProtocol = 0,
2057 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2058 /* Microsoft Lifecam NX-6000 */
2059 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2060 | USB_DEVICE_ID_MATCH_INT_INFO,
2061 .idVendor = 0x045e,
2062 .idProduct = 0x00f8,
2063 .bInterfaceClass = USB_CLASS_VIDEO,
2064 .bInterfaceSubClass = 1,
2065 .bInterfaceProtocol = 0,
2066 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2067 /* Microsoft Lifecam VX-7000 */
2068 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2069 | USB_DEVICE_ID_MATCH_INT_INFO,
2070 .idVendor = 0x045e,
2071 .idProduct = 0x0723,
2072 .bInterfaceClass = USB_CLASS_VIDEO,
2073 .bInterfaceSubClass = 1,
2074 .bInterfaceProtocol = 0,
2075 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2076 /* Logitech Quickcam Fusion */
2077 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2078 | USB_DEVICE_ID_MATCH_INT_INFO,
2079 .idVendor = 0x046d,
2080 .idProduct = 0x08c1,
2081 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
2082 .bInterfaceSubClass = 1,
2083 .bInterfaceProtocol = 0 },
2084 /* Logitech Quickcam Orbit MP */
2085 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2086 | USB_DEVICE_ID_MATCH_INT_INFO,
2087 .idVendor = 0x046d,
2088 .idProduct = 0x08c2,
2089 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
2090 .bInterfaceSubClass = 1,
2091 .bInterfaceProtocol = 0 },
2092 /* Logitech Quickcam Pro for Notebook */
2093 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2094 | USB_DEVICE_ID_MATCH_INT_INFO,
2095 .idVendor = 0x046d,
2096 .idProduct = 0x08c3,
2097 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
2098 .bInterfaceSubClass = 1,
2099 .bInterfaceProtocol = 0 },
2100 /* Logitech Quickcam Pro 5000 */
2101 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2102 | USB_DEVICE_ID_MATCH_INT_INFO,
2103 .idVendor = 0x046d,
2104 .idProduct = 0x08c5,
2105 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
2106 .bInterfaceSubClass = 1,
2107 .bInterfaceProtocol = 0 },
2108 /* Logitech Quickcam OEM Dell Notebook */
2109 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2110 | USB_DEVICE_ID_MATCH_INT_INFO,
2111 .idVendor = 0x046d,
2112 .idProduct = 0x08c6,
2113 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
2114 .bInterfaceSubClass = 1,
2115 .bInterfaceProtocol = 0 },
2116 /* Logitech Quickcam OEM Cisco VT Camera II */
2117 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2118 | USB_DEVICE_ID_MATCH_INT_INFO,
2119 .idVendor = 0x046d,
2120 .idProduct = 0x08c7,
2121 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
2122 .bInterfaceSubClass = 1,
2123 .bInterfaceProtocol = 0 },
2124 /* Chicony CNF7129 (Asus EEE 100HE) */
2125 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2126 | USB_DEVICE_ID_MATCH_INT_INFO,
2127 .idVendor = 0x04f2,
2128 .idProduct = 0xb071,
2129 .bInterfaceClass = USB_CLASS_VIDEO,
2130 .bInterfaceSubClass = 1,
2131 .bInterfaceProtocol = 0,
2132 .driver_info = UVC_QUIRK_RESTRICT_FRAME_RATE },
2133 /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
2134 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2135 | USB_DEVICE_ID_MATCH_INT_INFO,
2136 .idVendor = 0x058f,
2137 .idProduct = 0x3820,
2138 .bInterfaceClass = USB_CLASS_VIDEO,
2139 .bInterfaceSubClass = 1,
2140 .bInterfaceProtocol = 0,
2141 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2142 /* Apple Built-In iSight */
2143 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2144 | USB_DEVICE_ID_MATCH_INT_INFO,
2145 .idVendor = 0x05ac,
2146 .idProduct = 0x8501,
2147 .bInterfaceClass = USB_CLASS_VIDEO,
2148 .bInterfaceSubClass = 1,
2149 .bInterfaceProtocol = 0,
2150 .driver_info = UVC_QUIRK_PROBE_MINMAX
2151 | UVC_QUIRK_BUILTIN_ISIGHT },
2152 /* Foxlink ("HP Webcam" on HP Mini 5103) */
2153 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2154 | USB_DEVICE_ID_MATCH_INT_INFO,
2155 .idVendor = 0x05c8,
2156 .idProduct = 0x0403,
2157 .bInterfaceClass = USB_CLASS_VIDEO,
2158 .bInterfaceSubClass = 1,
2159 .bInterfaceProtocol = 0,
2160 .driver_info = UVC_QUIRK_FIX_BANDWIDTH },
2161 /* Genesys Logic USB 2.0 PC Camera */
2162 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2163 | USB_DEVICE_ID_MATCH_INT_INFO,
2164 .idVendor = 0x05e3,
2165 .idProduct = 0x0505,
2166 .bInterfaceClass = USB_CLASS_VIDEO,
2167 .bInterfaceSubClass = 1,
2168 .bInterfaceProtocol = 0,
2169 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2170 /* Hercules Classic Silver */
2171 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2172 | USB_DEVICE_ID_MATCH_INT_INFO,
2173 .idVendor = 0x06f8,
2174 .idProduct = 0x300c,
2175 .bInterfaceClass = USB_CLASS_VIDEO,
2176 .bInterfaceSubClass = 1,
2177 .bInterfaceProtocol = 0,
2178 .driver_info = UVC_QUIRK_FIX_BANDWIDTH },
2179 /* ViMicro Vega */
2180 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2181 | USB_DEVICE_ID_MATCH_INT_INFO,
2182 .idVendor = 0x0ac8,
2183 .idProduct = 0x332d,
2184 .bInterfaceClass = USB_CLASS_VIDEO,
2185 .bInterfaceSubClass = 1,
2186 .bInterfaceProtocol = 0,
2187 .driver_info = UVC_QUIRK_FIX_BANDWIDTH },
2188 /* ViMicro - Minoru3D */
2189 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2190 | USB_DEVICE_ID_MATCH_INT_INFO,
2191 .idVendor = 0x0ac8,
2192 .idProduct = 0x3410,
2193 .bInterfaceClass = USB_CLASS_VIDEO,
2194 .bInterfaceSubClass = 1,
2195 .bInterfaceProtocol = 0,
2196 .driver_info = UVC_QUIRK_FIX_BANDWIDTH },
2197 /* ViMicro Venus - Minoru3D */
2198 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2199 | USB_DEVICE_ID_MATCH_INT_INFO,
2200 .idVendor = 0x0ac8,
2201 .idProduct = 0x3420,
2202 .bInterfaceClass = USB_CLASS_VIDEO,
2203 .bInterfaceSubClass = 1,
2204 .bInterfaceProtocol = 0,
2205 .driver_info = UVC_QUIRK_FIX_BANDWIDTH },
2206 /* MT6227 */
2207 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2208 | USB_DEVICE_ID_MATCH_INT_INFO,
2209 .idVendor = 0x0e8d,
2210 .idProduct = 0x0004,
2211 .bInterfaceClass = USB_CLASS_VIDEO,
2212 .bInterfaceSubClass = 1,
2213 .bInterfaceProtocol = 0,
2214 .driver_info = UVC_QUIRK_PROBE_MINMAX
2215 | UVC_QUIRK_PROBE_DEF },
2216 /* IMC Networks (Medion Akoya) */
2217 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2218 | USB_DEVICE_ID_MATCH_INT_INFO,
2219 .idVendor = 0x13d3,
2220 .idProduct = 0x5103,
2221 .bInterfaceClass = USB_CLASS_VIDEO,
2222 .bInterfaceSubClass = 1,
2223 .bInterfaceProtocol = 0,
2224 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2225 /* JMicron USB2.0 XGA WebCam */
2226 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2227 | USB_DEVICE_ID_MATCH_INT_INFO,
2228 .idVendor = 0x152d,
2229 .idProduct = 0x0310,
2230 .bInterfaceClass = USB_CLASS_VIDEO,
2231 .bInterfaceSubClass = 1,
2232 .bInterfaceProtocol = 0,
2233 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2234 /* Syntek (HP Spartan) */
2235 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2236 | USB_DEVICE_ID_MATCH_INT_INFO,
2237 .idVendor = 0x174f,
2238 .idProduct = 0x5212,
2239 .bInterfaceClass = USB_CLASS_VIDEO,
2240 .bInterfaceSubClass = 1,
2241 .bInterfaceProtocol = 0,
2242 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2243 /* Syntek (Samsung Q310) */
2244 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2245 | USB_DEVICE_ID_MATCH_INT_INFO,
2246 .idVendor = 0x174f,
2247 .idProduct = 0x5931,
2248 .bInterfaceClass = USB_CLASS_VIDEO,
2249 .bInterfaceSubClass = 1,
2250 .bInterfaceProtocol = 0,
2251 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2252 /* Syntek (Packard Bell EasyNote MX52 */
2253 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2254 | USB_DEVICE_ID_MATCH_INT_INFO,
2255 .idVendor = 0x174f,
2256 .idProduct = 0x8a12,
2257 .bInterfaceClass = USB_CLASS_VIDEO,
2258 .bInterfaceSubClass = 1,
2259 .bInterfaceProtocol = 0,
2260 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2261 /* Syntek (Asus F9SG) */
2262 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2263 | USB_DEVICE_ID_MATCH_INT_INFO,
2264 .idVendor = 0x174f,
2265 .idProduct = 0x8a31,
2266 .bInterfaceClass = USB_CLASS_VIDEO,
2267 .bInterfaceSubClass = 1,
2268 .bInterfaceProtocol = 0,
2269 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2270 /* Syntek (Asus U3S) */
2271 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2272 | USB_DEVICE_ID_MATCH_INT_INFO,
2273 .idVendor = 0x174f,
2274 .idProduct = 0x8a33,
2275 .bInterfaceClass = USB_CLASS_VIDEO,
2276 .bInterfaceSubClass = 1,
2277 .bInterfaceProtocol = 0,
2278 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2279 /* Syntek (JAOtech Smart Terminal) */
2280 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2281 | USB_DEVICE_ID_MATCH_INT_INFO,
2282 .idVendor = 0x174f,
2283 .idProduct = 0x8a34,
2284 .bInterfaceClass = USB_CLASS_VIDEO,
2285 .bInterfaceSubClass = 1,
2286 .bInterfaceProtocol = 0,
2287 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2288 /* Miricle 307K */
2289 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2290 | USB_DEVICE_ID_MATCH_INT_INFO,
2291 .idVendor = 0x17dc,
2292 .idProduct = 0x0202,
2293 .bInterfaceClass = USB_CLASS_VIDEO,
2294 .bInterfaceSubClass = 1,
2295 .bInterfaceProtocol = 0,
2296 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2297 /* Lenovo Thinkpad SL400/SL500 */
2298 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2299 | USB_DEVICE_ID_MATCH_INT_INFO,
2300 .idVendor = 0x17ef,
2301 .idProduct = 0x480b,
2302 .bInterfaceClass = USB_CLASS_VIDEO,
2303 .bInterfaceSubClass = 1,
2304 .bInterfaceProtocol = 0,
2305 .driver_info = UVC_QUIRK_STREAM_NO_FID },
2306 /* Aveo Technology USB 2.0 Camera */
2307 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2308 | USB_DEVICE_ID_MATCH_INT_INFO,
2309 .idVendor = 0x1871,
2310 .idProduct = 0x0306,
2311 .bInterfaceClass = USB_CLASS_VIDEO,
2312 .bInterfaceSubClass = 1,
2313 .bInterfaceProtocol = 0,
2314 .driver_info = UVC_QUIRK_PROBE_MINMAX
2315 | UVC_QUIRK_PROBE_EXTRAFIELDS },
2316 /* Ecamm Pico iMage */
2317 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2318 | USB_DEVICE_ID_MATCH_INT_INFO,
2319 .idVendor = 0x18cd,
2320 .idProduct = 0xcafe,
2321 .bInterfaceClass = USB_CLASS_VIDEO,
2322 .bInterfaceSubClass = 1,
2323 .bInterfaceProtocol = 0,
2324 .driver_info = UVC_QUIRK_PROBE_EXTRAFIELDS },
2325 /* Manta MM-353 Plako */
2326 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2327 | USB_DEVICE_ID_MATCH_INT_INFO,
2328 .idVendor = 0x18ec,
2329 .idProduct = 0x3188,
2330 .bInterfaceClass = USB_CLASS_VIDEO,
2331 .bInterfaceSubClass = 1,
2332 .bInterfaceProtocol = 0,
2333 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2334 /* FSC WebCam V30S */
2335 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2336 | USB_DEVICE_ID_MATCH_INT_INFO,
2337 .idVendor = 0x18ec,
2338 .idProduct = 0x3288,
2339 .bInterfaceClass = USB_CLASS_VIDEO,
2340 .bInterfaceSubClass = 1,
2341 .bInterfaceProtocol = 0,
2342 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2343 /* Arkmicro unbranded */
2344 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2345 | USB_DEVICE_ID_MATCH_INT_INFO,
2346 .idVendor = 0x18ec,
2347 .idProduct = 0x3290,
2348 .bInterfaceClass = USB_CLASS_VIDEO,
2349 .bInterfaceSubClass = 1,
2350 .bInterfaceProtocol = 0,
2351 .driver_info = UVC_QUIRK_PROBE_DEF },
2352 /* The Imaging Source USB CCD cameras */
2353 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2354 | USB_DEVICE_ID_MATCH_INT_INFO,
2355 .idVendor = 0x199e,
2356 .idProduct = 0x8102,
2357 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
2358 .bInterfaceSubClass = 1,
2359 .bInterfaceProtocol = 0 },
2360 /* Bodelin ProScopeHR */
2361 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2362 | USB_DEVICE_ID_MATCH_DEV_HI
2363 | USB_DEVICE_ID_MATCH_INT_INFO,
2364 .idVendor = 0x19ab,
2365 .idProduct = 0x1000,
2366 .bcdDevice_hi = 0x0126,
2367 .bInterfaceClass = USB_CLASS_VIDEO,
2368 .bInterfaceSubClass = 1,
2369 .bInterfaceProtocol = 0,
2370 .driver_info = UVC_QUIRK_STATUS_INTERVAL },
2371 /* MSI StarCam 370i */
2372 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2373 | USB_DEVICE_ID_MATCH_INT_INFO,
2374 .idVendor = 0x1b3b,
2375 .idProduct = 0x2951,
2376 .bInterfaceClass = USB_CLASS_VIDEO,
2377 .bInterfaceSubClass = 1,
2378 .bInterfaceProtocol = 0,
2379 .driver_info = UVC_QUIRK_PROBE_MINMAX },
2380 /* SiGma Micro USB Web Camera */
2381 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
2382 | USB_DEVICE_ID_MATCH_INT_INFO,
2383 .idVendor = 0x1c4f,
2384 .idProduct = 0x3000,
2385 .bInterfaceClass = USB_CLASS_VIDEO,
2386 .bInterfaceSubClass = 1,
2387 .bInterfaceProtocol = 0,
2388 .driver_info = UVC_QUIRK_PROBE_MINMAX
2389 | UVC_QUIRK_IGNORE_SELECTOR_UNIT },
2390 /* Generic USB Video Class */
2391 { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
2392 {}
2393 };
2394
2395 MODULE_DEVICE_TABLE(usb, uvc_ids);
2396
2397 struct uvc_driver uvc_driver = {
2398 .driver = {
2399 .name = "uvcvideo",
2400 .probe = uvc_probe,
2401 .disconnect = uvc_disconnect,
2402 .suspend = uvc_suspend,
2403 .resume = uvc_resume,
2404 .reset_resume = uvc_reset_resume,
2405 .id_table = uvc_ids,
2406 .supports_autosuspend = 1,
2407 },
2408 };
2409
uvc_init(void)2410 static int __init uvc_init(void)
2411 {
2412 int ret;
2413
2414 uvc_debugfs_init();
2415
2416 ret = usb_register(&uvc_driver.driver);
2417 if (ret < 0) {
2418 uvc_debugfs_cleanup();
2419 return ret;
2420 }
2421
2422 printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
2423 return 0;
2424 }
2425
uvc_cleanup(void)2426 static void __exit uvc_cleanup(void)
2427 {
2428 usb_deregister(&uvc_driver.driver);
2429 uvc_debugfs_cleanup();
2430 }
2431
2432 module_init(uvc_init);
2433 module_exit(uvc_cleanup);
2434
2435 MODULE_AUTHOR(DRIVER_AUTHOR);
2436 MODULE_DESCRIPTION(DRIVER_DESC);
2437 MODULE_LICENSE("GPL");
2438 MODULE_VERSION(DRIVER_VERSION);
2439
2440