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V4L/DVB (8145a): USB Video Class driver
[deliverable/linux.git] / drivers / media / video / uvc / uvc_driver.c
CommitLineData
c0efd232
LP		 1/*
2 * uvc_driver.c -- USB Video Class driver
3 *
4 * Copyright (C) 2005-2008
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/*
15 * This driver aims to support video input devices compliant with the 'USB
16 * 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/version.h>
28#include <linux/list.h>
29#include <linux/module.h>
30#include <linux/usb.h>
31#include <linux/videodev2.h>
32#include <linux/vmalloc.h>
33#include <linux/wait.h>
34#include <asm/atomic.h>
35
36#include <media/v4l2-common.h>
37
38#include "uvcvideo.h"
39
40#define DRIVER_AUTHOR "Laurent Pinchart <laurent.pinchart@skynet.be>"
41#define DRIVER_DESC "USB Video Class driver"
42#ifndef DRIVER_VERSION
43#define DRIVER_VERSION "v0.1.0"
44#endif
45
46static unsigned int uvc_quirks_param;
47unsigned int uvc_trace_param;
48
49/* ------------------------------------------------------------------------
50 * Control, formats, ...
51 */
52
53static struct uvc_format_desc uvc_fmts[] = {
54 {
55 .name = "YUV 4:2:2 (YUYV)",
56 .guid = UVC_GUID_FORMAT_YUY2,
57 .fcc = V4L2_PIX_FMT_YUYV,
58 },
59 {
60 .name = "YUV 4:2:0 (NV12)",
61 .guid = UVC_GUID_FORMAT_NV12,
62 .fcc = V4L2_PIX_FMT_NV12,
63 },
64 {
65 .name = "MJPEG",
66 .guid = UVC_GUID_FORMAT_MJPEG,
67 .fcc = V4L2_PIX_FMT_MJPEG,
68 },
69 {
70 .name = "YVU 4:2:0 (YV12)",
71 .guid = UVC_GUID_FORMAT_YV12,
72 .fcc = V4L2_PIX_FMT_YVU420,
73 },
74 {
75 .name = "YUV 4:2:0 (I420)",
76 .guid = UVC_GUID_FORMAT_I420,
77 .fcc = V4L2_PIX_FMT_YUV420,
78 },
79 {
80 .name = "YUV 4:2:2 (UYVY)",
81 .guid = UVC_GUID_FORMAT_UYVY,
82 .fcc = V4L2_PIX_FMT_UYVY,
83 },
84 {
85 .name = "Greyscale",
86 .guid = UVC_GUID_FORMAT_Y800,
87 .fcc = V4L2_PIX_FMT_GREY,
88 },
89 {
90 .name = "RGB Bayer",
91 .guid = UVC_GUID_FORMAT_BY8,
92 .fcc = V4L2_PIX_FMT_SBGGR8,
93 },
94};
95
96/* ------------------------------------------------------------------------
97 * Utility functions
98 */
99
100struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
101 __u8 epaddr)
102{
103 struct usb_host_endpoint *ep;
104 unsigned int i;
105
106 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
107 ep = &alts->endpoint[i];
108 if (ep->desc.bEndpointAddress == epaddr)
109 return ep;
110 }
111
112 return NULL;
113}
114
115static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
116{
117 unsigned int len = ARRAY_SIZE(uvc_fmts);
118 unsigned int i;
119
120 for (i = 0; i < len; ++i) {
121 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
122 return &uvc_fmts[i];
123 }
124
125 return NULL;
126}
127
128static __u32 uvc_colorspace(const __u8 primaries)
129{
130 static const __u8 colorprimaries[] = {
131 0,
132 V4L2_COLORSPACE_SRGB,
133 V4L2_COLORSPACE_470_SYSTEM_M,
134 V4L2_COLORSPACE_470_SYSTEM_BG,
135 V4L2_COLORSPACE_SMPTE170M,
136 V4L2_COLORSPACE_SMPTE240M,
137 };
138
139 if (primaries < ARRAY_SIZE(colorprimaries))
140 return colorprimaries[primaries];
141
142 return 0;
143}
144
145/* Simplify a fraction using a simple continued fraction decomposition. The
146 * idea here is to convert fractions such as 333333/10000000 to 1/30 using
147 * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
148 * arbitrary parameters to remove non-significative terms from the simple
149 * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
150 * respectively seems to give nice results.
151 */
152void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
153 unsigned int n_terms, unsigned int threshold)
154{
155 uint32_t *an;
156 uint32_t x, y, r;
157 unsigned int i, n;
158
159 an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
160 if (an == NULL)
161 return;
162
163 /* Convert the fraction to a simple continued fraction. See
164 * http://mathforum.org/dr.math/faq/faq.fractions.html
165 * Stop if the current term is bigger than or equal to the given
166 * threshold.
167 */
168 x = *numerator;
169 y = *denominator;
170
171 for (n = 0; n < n_terms && y != 0; ++n) {
172 an[n] = x / y;
173 if (an[n] >= threshold) {
174 if (n < 2)
175 n++;
176 break;
177 }
178
179 r = x - an[n] * y;
180 x = y;
181 y = r;
182 }
183
184 /* Expand the simple continued fraction back to an integer fraction. */
185 x = 0;
186 y = 1;
187
188 for (i = n; i > 0; --i) {
189 r = y;
190 y = an[i-1] * y + x;
191 x = r;
192 }
193
194 *numerator = y;
195 *denominator = x;
196 kfree(an);
197}
198
199/* Convert a fraction to a frame interval in 100ns multiples. The idea here is
200 * to compute numerator / denominator * 10000000 using 32 bit fixed point
201 * arithmetic only.
202 */
203uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
204{
205 uint32_t multiplier;
206
207 /* Saturate the result if the operation would overflow. */
208 if (denominator == 0 ||
209 numerator/denominator >= ((uint32_t)-1)/10000000)
210 return (uint32_t)-1;
211
212 /* Divide both the denominator and the multiplier by two until
213 * numerator * multiplier doesn't overflow. If anyone knows a better
214 * algorithm please let me know.
215 */
216 multiplier = 10000000;
217 while (numerator > ((uint32_t)-1)/multiplier) {
218 multiplier /= 2;
219 denominator /= 2;
220 }
221
222 return denominator ? numerator * multiplier / denominator : 0;
223}
224
225/* ------------------------------------------------------------------------
226 * Terminal and unit management
227 */
228
229static struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
230{
231 struct uvc_entity *entity;
232
233 list_for_each_entry(entity, &dev->entities, list) {
234 if (entity->id == id)
235 return entity;
236 }
237
238 return NULL;
239}
240
241static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
242 int id, struct uvc_entity *entity)
243{
244 unsigned int i;
245
246 if (entity == NULL)
247 entity = list_entry(&dev->entities, struct uvc_entity, list);
248
249 list_for_each_entry_continue(entity, &dev->entities, list) {
250 switch (UVC_ENTITY_TYPE(entity)) {
251 case TT_STREAMING:
252 if (entity->output.bSourceID == id)
253 return entity;
254 break;
255
256 case VC_PROCESSING_UNIT:
257 if (entity->processing.bSourceID == id)
258 return entity;
259 break;
260
261 case VC_SELECTOR_UNIT:
262 for (i = 0; i < entity->selector.bNrInPins; ++i)
263 if (entity->selector.baSourceID[i] == id)
264 return entity;
265 break;
266
267 case VC_EXTENSION_UNIT:
268 for (i = 0; i < entity->extension.bNrInPins; ++i)
269 if (entity->extension.baSourceID[i] == id)
270 return entity;
271 break;
272 }
273 }
274
275 return NULL;
276}
277
278/* ------------------------------------------------------------------------
279 * Descriptors handling
280 */
281
282static int uvc_parse_format(struct uvc_device *dev,
283 struct uvc_streaming *streaming, struct uvc_format *format,
284 __u32 **intervals, unsigned char *buffer, int buflen)
285{
286 struct usb_interface *intf = streaming->intf;
287 struct usb_host_interface *alts = intf->cur_altsetting;
288 struct uvc_format_desc *fmtdesc;
289 struct uvc_frame *frame;
290 const unsigned char *start = buffer;
291 unsigned int interval;
292 unsigned int i, n;
293 __u8 ftype;
294
295 format->type = buffer[2];
296 format->index = buffer[3];
297
298 switch (buffer[2]) {
299 case VS_FORMAT_UNCOMPRESSED:
300 case VS_FORMAT_FRAME_BASED:
301 if (buflen < 27) {
302 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
303 "interface %d FORMAT error\n",
304 dev->udev->devnum,
305 alts->desc.bInterfaceNumber);
306 return -EINVAL;
307 }
308
309 /* Find the format descriptor from its GUID. */
310 fmtdesc = uvc_format_by_guid(&buffer[5]);
311
312 if (fmtdesc != NULL) {
313 strncpy(format->name, fmtdesc->name,
314 sizeof format->name);
315 format->fcc = fmtdesc->fcc;
316 } else {
317 uvc_printk(KERN_INFO, "Unknown video format "
318 UVC_GUID_FORMAT "\n",
319 UVC_GUID_ARGS(&buffer[5]));
320 snprintf(format->name, sizeof format->name,
321 UVC_GUID_FORMAT, UVC_GUID_ARGS(&buffer[5]));
322 format->fcc = 0;
323 }
324
325 format->bpp = buffer[21];
326 if (buffer[2] == VS_FORMAT_UNCOMPRESSED) {
327 ftype = VS_FRAME_UNCOMPRESSED;
328 } else {
329 ftype = VS_FRAME_FRAME_BASED;
330 if (buffer[27])
331 format->flags = UVC_FMT_FLAG_COMPRESSED;
332 }
333 break;
334
335 case VS_FORMAT_MJPEG:
336 if (buflen < 11) {
337 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
338 "interface %d FORMAT error\n",
339 dev->udev->devnum,
340 alts->desc.bInterfaceNumber);
341 return -EINVAL;
342 }
343
344 strncpy(format->name, "MJPEG", sizeof format->name);
345 format->fcc = V4L2_PIX_FMT_MJPEG;
346 format->flags = UVC_FMT_FLAG_COMPRESSED;
347 format->bpp = 0;
348 ftype = VS_FRAME_MJPEG;
349 break;
350
351 case VS_FORMAT_DV:
352 if (buflen < 9) {
353 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
354 "interface %d FORMAT error\n",
355 dev->udev->devnum,
356 alts->desc.bInterfaceNumber);
357 return -EINVAL;
358 }
359
360 switch (buffer[8] & 0x7f) {
361 case 0:
362 strncpy(format->name, "SD-DV", sizeof format->name);
363 break;
364 case 1:
365 strncpy(format->name, "SDL-DV", sizeof format->name);
366 break;
367 case 2:
368 strncpy(format->name, "HD-DV", sizeof format->name);
369 break;
370 default:
371 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
372 "interface %d: unknown DV format %u\n",
373 dev->udev->devnum,
374 alts->desc.bInterfaceNumber, buffer[8]);
375 return -EINVAL;
376 }
377
378 strncat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
379 sizeof format->name);
380
381 format->fcc = V4L2_PIX_FMT_DV;
382 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
383 format->bpp = 0;
384 ftype = 0;
385
386 /* Create a dummy frame descriptor. */
387 frame = &format->frame[0];
388 memset(&format->frame[0], 0, sizeof format->frame[0]);
389 frame->bFrameIntervalType = 1;
390 frame->dwDefaultFrameInterval = 1;
391 frame->dwFrameInterval = *intervals;
392 *(*intervals)++ = 1;
393 format->nframes = 1;
394 break;
395
396 case VS_FORMAT_MPEG2TS:
397 case VS_FORMAT_STREAM_BASED:
398 /* Not supported yet. */
399 default:
400 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
401 "interface %d unsupported format %u\n",
402 dev->udev->devnum, alts->desc.bInterfaceNumber,
403 buffer[2]);
404 return -EINVAL;
405 }
406
407 uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
408
409 buflen -= buffer[0];
410 buffer += buffer[0];
411
412 /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
413 * based formats have frame descriptors.
414 */
415 while (buflen > 2 && buffer[2] == ftype) {
416 frame = &format->frame[format->nframes];
417
418 if (ftype != VS_FRAME_FRAME_BASED)
419 n = buflen > 25 ? buffer[25] : 0;
420 else
421 n = buflen > 21 ? buffer[21] : 0;
422
423 n = n ? n : 3;
424
425 if (buflen < 26 + 4*n) {
426 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
427 "interface %d FRAME error\n", dev->udev->devnum,
428 alts->desc.bInterfaceNumber);
429 return -EINVAL;
430 }
431
432 frame->bFrameIndex = buffer[3];
433 frame->bmCapabilities = buffer[4];
434 frame->wWidth = le16_to_cpup((__le16 *)&buffer[5]);
435 frame->wHeight = le16_to_cpup((__le16 *)&buffer[7]);
436 frame->dwMinBitRate = le32_to_cpup((__le32 *)&buffer[9]);
437 frame->dwMaxBitRate = le32_to_cpup((__le32 *)&buffer[13]);
438 if (ftype != VS_FRAME_FRAME_BASED) {
439 frame->dwMaxVideoFrameBufferSize =
440 le32_to_cpup((__le32 *)&buffer[17]);
441 frame->dwDefaultFrameInterval =
442 le32_to_cpup((__le32 *)&buffer[21]);
443 frame->bFrameIntervalType = buffer[25];
444 } else {
445 frame->dwMaxVideoFrameBufferSize = 0;
446 frame->dwDefaultFrameInterval =
447 le32_to_cpup((__le32 *)&buffer[17]);
448 frame->bFrameIntervalType = buffer[21];
449 }
450 frame->dwFrameInterval = *intervals;
451
452 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
453 * completely. Observed behaviours range from setting the
454 * value to 1.1x the actual frame size of hardwiring the
455 * 16 low bits to 0. This results in a higher than necessary
456 * memory usage as well as a wrong image size information. For
457 * uncompressed formats this can be fixed by computing the
458 * value from the frame size.
459 */
460 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
461 frame->dwMaxVideoFrameBufferSize = format->bpp
462 * frame->wWidth * frame->wHeight / 8;
463
464 /* Some bogus devices report dwMinFrameInterval equal to
465 * dwMaxFrameInterval and have dwFrameIntervalStep set to
466 * zero. Setting all null intervals to 1 fixes the problem and
467 * some other divisions by zero which could happen.
468 */
469 for (i = 0; i < n; ++i) {
470 interval = le32_to_cpup((__le32 *)&buffer[26+4*i]);
471 *(*intervals)++ = interval ? interval : 1;
472 }
473
474 /* Make sure that the default frame interval stays between
475 * the boundaries.
476 */
477 n -= frame->bFrameIntervalType ? 1 : 2;
478 frame->dwDefaultFrameInterval =
479 min(frame->dwFrameInterval[n],
480 max(frame->dwFrameInterval[0],
481 frame->dwDefaultFrameInterval));
482
483 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
484 frame->wWidth, frame->wHeight,
485 10000000/frame->dwDefaultFrameInterval,
486 (100000000/frame->dwDefaultFrameInterval)%10);
487
488 format->nframes++;
489 buflen -= buffer[0];
490 buffer += buffer[0];
491 }
492
493 if (buflen > 2 && buffer[2] == VS_STILL_IMAGE_FRAME) {
494 buflen -= buffer[0];
495 buffer += buffer[0];
496 }
497
498 if (buflen > 2 && buffer[2] == VS_COLORFORMAT) {
499 if (buflen < 6) {
500 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
501 "interface %d COLORFORMAT error\n",
502 dev->udev->devnum,
503 alts->desc.bInterfaceNumber);
504 return -EINVAL;
505 }
506
507 format->colorspace = uvc_colorspace(buffer[3]);
508
509 buflen -= buffer[0];
510 buffer += buffer[0];
511 }
512
513 return buffer - start;
514}
515
516static int uvc_parse_streaming(struct uvc_device *dev,
517 struct usb_interface *intf)
518{
519 struct uvc_streaming *streaming = NULL;
520 struct uvc_format *format;
521 struct uvc_frame *frame;
522 struct usb_host_interface *alts = &intf->altsetting[0];
523 unsigned char *_buffer, *buffer = alts->extra;
524 int _buflen, buflen = alts->extralen;
525 unsigned int nformats = 0, nframes = 0, nintervals = 0;
526 unsigned int size, i, n, p;
527 __u32 *interval;
528 __u16 psize;
529 int ret = -EINVAL;
530
531 if (intf->cur_altsetting->desc.bInterfaceSubClass
532 != SC_VIDEOSTREAMING) {
533 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
534 "video streaming interface\n", dev->udev->devnum,
535 intf->altsetting[0].desc.bInterfaceNumber);
536 return -EINVAL;
537 }
538
539 if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
540 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
541 "claimed\n", dev->udev->devnum,
542 intf->altsetting[0].desc.bInterfaceNumber);
543 return -EINVAL;
544 }
545
546 streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
547 if (streaming == NULL) {
548 usb_driver_release_interface(&uvc_driver.driver, intf);
549 return -EINVAL;
550 }
551
552 mutex_init(&streaming->mutex);
553 streaming->intf = usb_get_intf(intf);
554 streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
555
556 /* The Pico iMage webcam has its class-specific interface descriptors
557 * after the endpoint descriptors.
558 */
559 if (buflen == 0) {
560 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
561 struct usb_host_endpoint *ep = &alts->endpoint[i];
562
563 if (ep->extralen == 0)
564 continue;
565
566 if (ep->extralen > 2 &&
567 ep->extra[1] == USB_DT_CS_INTERFACE) {
568 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
569 "from endpoint %u.\n", i);
570 buffer = alts->endpoint[i].extra;
571 buflen = alts->endpoint[i].extralen;
572 break;
573 }
574 }
575 }
576
577 /* Skip the standard interface descriptors. */
578 while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
579 buflen -= buffer[0];
580 buffer += buffer[0];
581 }
582
583 if (buflen <= 2) {
584 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
585 "interface descriptors found.\n");
586 goto error;
587 }
588
589 /* Parse the header descriptor. */
590 if (buffer[2] == VS_OUTPUT_HEADER) {
591 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
592 "%d OUTPUT HEADER descriptor is not supported.\n",
593 dev->udev->devnum, alts->desc.bInterfaceNumber);
594 goto error;
595 } else if (buffer[2] == VS_INPUT_HEADER) {
596 p = buflen >= 5 ? buffer[3] : 0;
597 n = buflen >= 12 ? buffer[12] : 0;
598
599 if (buflen < 13 + p*n || buffer[2] != VS_INPUT_HEADER) {
600 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
601 "interface %d INPUT HEADER descriptor is "
602 "invalid.\n", dev->udev->devnum,
603 alts->desc.bInterfaceNumber);
604 goto error;
605 }
606
607 streaming->header.bNumFormats = p;
608 streaming->header.bEndpointAddress = buffer[6];
609 streaming->header.bmInfo = buffer[7];
610 streaming->header.bTerminalLink = buffer[8];
611 streaming->header.bStillCaptureMethod = buffer[9];
612 streaming->header.bTriggerSupport = buffer[10];
613 streaming->header.bTriggerUsage = buffer[11];
614 streaming->header.bControlSize = n;
615
616 streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
617 if (streaming->header.bmaControls == NULL) {
618 ret = -ENOMEM;
619 goto error;
620 }
621
622 memcpy(streaming->header.bmaControls, &buffer[13], p*n);
623 } else {
624 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
625 "%d HEADER descriptor not found.\n", dev->udev->devnum,
626 alts->desc.bInterfaceNumber);
627 goto error;
628 }
629
630 buflen -= buffer[0];
631 buffer += buffer[0];
632
633 _buffer = buffer;
634 _buflen = buflen;
635
636 /* Count the format and frame descriptors. */
637 while (_buflen > 2) {
638 switch (_buffer[2]) {
639 case VS_FORMAT_UNCOMPRESSED:
640 case VS_FORMAT_MJPEG:
641 case VS_FORMAT_FRAME_BASED:
642 nformats++;
643 break;
644
645 case VS_FORMAT_DV:
646 /* DV format has no frame descriptor. We will create a
647 * dummy frame descriptor with a dummy frame interval.
648 */
649 nformats++;
650 nframes++;
651 nintervals++;
652 break;
653
654 case VS_FORMAT_MPEG2TS:
655 case VS_FORMAT_STREAM_BASED:
656 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
657 "interface %d FORMAT %u is not supported.\n",
658 dev->udev->devnum,
659 alts->desc.bInterfaceNumber, _buffer[2]);
660 break;
661
662 case VS_FRAME_UNCOMPRESSED:
663 case VS_FRAME_MJPEG:
664 nframes++;
665 if (_buflen > 25)
666 nintervals += _buffer[25] ? _buffer[25] : 3;
667 break;
668
669 case VS_FRAME_FRAME_BASED:
670 nframes++;
671 if (_buflen > 21)
672 nintervals += _buffer[21] ? _buffer[21] : 3;
673 break;
674 }
675
676 _buflen -= _buffer[0];
677 _buffer += _buffer[0];
678 }
679
680 if (nformats == 0) {
681 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
682 "%d has no supported formats defined.\n",
683 dev->udev->devnum, alts->desc.bInterfaceNumber);
684 goto error;
685 }
686
687 size = nformats * sizeof *format + nframes * sizeof *frame
688 + nintervals * sizeof *interval;
689 format = kzalloc(size, GFP_KERNEL);
690 if (format == NULL) {
691 ret = -ENOMEM;
692 goto error;
693 }
694
695 frame = (struct uvc_frame *)&format[nformats];
696 interval = (__u32 *)&frame[nframes];
697
698 streaming->format = format;
699 streaming->nformats = nformats;
700
701 /* Parse the format descriptors. */
702 while (buflen > 2) {
703 switch (buffer[2]) {
704 case VS_FORMAT_UNCOMPRESSED:
705 case VS_FORMAT_MJPEG:
706 case VS_FORMAT_DV:
707 case VS_FORMAT_FRAME_BASED:
708 format->frame = frame;
709 ret = uvc_parse_format(dev, streaming, format,
710 &interval, buffer, buflen);
711 if (ret < 0)
712 goto error;
713
714 frame += format->nframes;
715 format++;
716
717 buflen -= ret;
718 buffer += ret;
719 continue;
720
721 default:
722 break;
723 }
724
725 buflen -= buffer[0];
726 buffer += buffer[0];
727 }
728
729 /* Parse the alternate settings to find the maximum bandwidth. */
730 for (i = 0; i < intf->num_altsetting; ++i) {
731 struct usb_host_endpoint *ep;
732 alts = &intf->altsetting[i];
733 ep = uvc_find_endpoint(alts,
734 streaming->header.bEndpointAddress);
735 if (ep == NULL)
736 continue;
737
738 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
739 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
740 if (psize > streaming->maxpsize)
741 streaming->maxpsize = psize;
742 }
743
744 list_add_tail(&streaming->list, &dev->streaming);
745 return 0;
746
747error:
748 usb_driver_release_interface(&uvc_driver.driver, intf);
749 usb_put_intf(intf);
750 kfree(streaming->format);
751 kfree(streaming->header.bmaControls);
752 kfree(streaming);
753 return ret;
754}
755
756/* Parse vendor-specific extensions. */
757static int uvc_parse_vendor_control(struct uvc_device *dev,
758 const unsigned char *buffer, int buflen)
759{
760 struct usb_device *udev = dev->udev;
761 struct usb_host_interface *alts = dev->intf->cur_altsetting;
762 struct uvc_entity *unit;
763 unsigned int n, p;
764 int handled = 0;
765
766 switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
767 case 0x046d: /* Logitech */
768 if (buffer[1] != 0x41 || buffer[2] != 0x01)
769 break;
770
771 /* Logitech implements several vendor specific functions
772 * through vendor specific extension units (LXU).
773 *
774 * The LXU descriptors are similar to XU descriptors
775 * (see "USB Device Video Class for Video Devices", section
776 * 3.7.2.6 "Extension Unit Descriptor") with the following
777 * differences:
778 *
779 * ----------------------------------------------------------
780 * 0 bLength 1 Number
781 * Size of this descriptor, in bytes: 24+p+n*2
782 * ----------------------------------------------------------
783 * 23+p+n bmControlsType N Bitmap
784 * Individual bits in the set are defined:
785 * 0: Absolute
786 * 1: Relative
787 *
788 * This bitset is mapped exactly the same as bmControls.
789 * ----------------------------------------------------------
790 * 23+p+n*2 bReserved 1 Boolean
791 * ----------------------------------------------------------
792 * 24+p+n*2 iExtension 1 Index
793 * Index of a string descriptor that describes this
794 * extension unit.
795 * ----------------------------------------------------------
796 */
797 p = buflen >= 22 ? buffer[21] : 0;
798 n = buflen >= 25 + p ? buffer[22+p] : 0;
799
800 if (buflen < 25 + p + 2*n) {
801 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
802 "interface %d EXTENSION_UNIT error\n",
803 udev->devnum, alts->desc.bInterfaceNumber);
804 break;
805 }
806
807 unit = kzalloc(sizeof *unit + p + 2*n, GFP_KERNEL);
808 if (unit == NULL)
809 return -ENOMEM;
810
811 unit->id = buffer[3];
812 unit->type = VC_EXTENSION_UNIT;
813 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
814 unit->extension.bNumControls = buffer[20];
815 unit->extension.bNrInPins =
816 le16_to_cpup((__le16 *)&buffer[21]);
817 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
818 memcpy(unit->extension.baSourceID, &buffer[22], p);
819 unit->extension.bControlSize = buffer[22+p];
820 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
821 unit->extension.bmControlsType = (__u8 *)unit + sizeof *unit
822 + p + n;
823 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
824
825 if (buffer[24+p+2*n] != 0)
826 usb_string(udev, buffer[24+p+2*n], unit->name,
827 sizeof unit->name);
828 else
829 sprintf(unit->name, "Extension %u", buffer[3]);
830
831 list_add_tail(&unit->list, &dev->entities);
832 handled = 1;
833 break;
834 }
835
836 return handled;
837}
838
839static int uvc_parse_standard_control(struct uvc_device *dev,
840 const unsigned char *buffer, int buflen)
841{
842 struct usb_device *udev = dev->udev;
843 struct uvc_entity *unit, *term;
844 struct usb_interface *intf;
845 struct usb_host_interface *alts = dev->intf->cur_altsetting;
846 unsigned int i, n, p, len;
847 __u16 type;
848
849 switch (buffer[2]) {
850 case VC_HEADER:
851 n = buflen >= 12 ? buffer[11] : 0;
852
853 if (buflen < 12 || buflen < 12 + n) {
854 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
855 "interface %d HEADER error\n", udev->devnum,
856 alts->desc.bInterfaceNumber);
857 return -EINVAL;
858 }
859
860 dev->uvc_version = le16_to_cpup((__le16 *)&buffer[3]);
861 dev->clock_frequency = le32_to_cpup((__le32 *)&buffer[7]);
862
863 /* Parse all USB Video Streaming interfaces. */
864 for (i = 0; i < n; ++i) {
865 intf = usb_ifnum_to_if(udev, buffer[12+i]);
866 if (intf == NULL) {
867 uvc_trace(UVC_TRACE_DESCR, "device %d "
868 "interface %d doesn't exists\n",
869 udev->devnum, i);
870 continue;
871 }
872
873 uvc_parse_streaming(dev, intf);
874 }
875 break;
876
877 case VC_INPUT_TERMINAL:
878 if (buflen < 8) {
879 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
880 "interface %d INPUT_TERMINAL error\n",
881 udev->devnum, alts->desc.bInterfaceNumber);
882 return -EINVAL;
883 }
884
885 /* Make sure the terminal type MSB is not null, otherwise it
886 * could be confused with a unit.
887 */
888 type = le16_to_cpup((__le16 *)&buffer[4]);
889 if ((type & 0xff00) == 0) {
890 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
891 "interface %d INPUT_TERMINAL %d has invalid "
892 "type 0x%04x, skipping\n", udev->devnum,
893 alts->desc.bInterfaceNumber,
894 buffer[3], type);
895 return 0;
896 }
897
898 n = 0;
899 p = 0;
900 len = 8;
901
902 if (type == ITT_CAMERA) {
903 n = buflen >= 15 ? buffer[14] : 0;
904 len = 15;
905
906 } else if (type == ITT_MEDIA_TRANSPORT_INPUT) {
907 n = buflen >= 9 ? buffer[8] : 0;
908 p = buflen >= 10 + n ? buffer[9+n] : 0;
909 len = 10;
910 }
911
912 if (buflen < len + n + p) {
913 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
914 "interface %d INPUT_TERMINAL error\n",
915 udev->devnum, alts->desc.bInterfaceNumber);
916 return -EINVAL;
917 }
918
919 term = kzalloc(sizeof *term + n + p, GFP_KERNEL);
920 if (term == NULL)
921 return -ENOMEM;
922
923 term->id = buffer[3];
924 term->type = type | UVC_TERM_INPUT;
925
926 if (UVC_ENTITY_TYPE(term) == ITT_CAMERA) {
927 term->camera.bControlSize = n;
928 term->camera.bmControls = (__u8 *)term + sizeof *term;
929 term->camera.wObjectiveFocalLengthMin =
930 le16_to_cpup((__le16 *)&buffer[8]);
931 term->camera.wObjectiveFocalLengthMax =
932 le16_to_cpup((__le16 *)&buffer[10]);
933 term->camera.wOcularFocalLength =
934 le16_to_cpup((__le16 *)&buffer[12]);
935 memcpy(term->camera.bmControls, &buffer[15], n);
936 } else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT) {
937 term->media.bControlSize = n;
938 term->media.bmControls = (__u8 *)term + sizeof *term;
939 term->media.bTransportModeSize = p;
940 term->media.bmTransportModes = (__u8 *)term
941 + sizeof *term + n;
942 memcpy(term->media.bmControls, &buffer[9], n);
943 memcpy(term->media.bmTransportModes, &buffer[10+n], p);
944 }
945
946 if (buffer[7] != 0)
947 usb_string(udev, buffer[7], term->name,
948 sizeof term->name);
949 else if (UVC_ENTITY_TYPE(term) == ITT_CAMERA)
950 sprintf(term->name, "Camera %u", buffer[3]);
951 else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT)
952 sprintf(term->name, "Media %u", buffer[3]);
953 else
954 sprintf(term->name, "Input %u", buffer[3]);
955
956 list_add_tail(&term->list, &dev->entities);
957 break;
958
959 case VC_OUTPUT_TERMINAL:
960 if (buflen < 9) {
961 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
962 "interface %d OUTPUT_TERMINAL error\n",
963 udev->devnum, alts->desc.bInterfaceNumber);
964 return -EINVAL;
965 }
966
967 /* Make sure the terminal type MSB is not null, otherwise it
968 * could be confused with a unit.
969 */
970 type = le16_to_cpup((__le16 *)&buffer[4]);
971 if ((type & 0xff00) == 0) {
972 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
973 "interface %d OUTPUT_TERMINAL %d has invalid "
974 "type 0x%04x, skipping\n", udev->devnum,
975 alts->desc.bInterfaceNumber, buffer[3], type);
976 return 0;
977 }
978
979 term = kzalloc(sizeof *term, GFP_KERNEL);
980 if (term == NULL)
981 return -ENOMEM;
982
983 term->id = buffer[3];
984 term->type = type | UVC_TERM_OUTPUT;
985 term->output.bSourceID = buffer[7];
986
987 if (buffer[8] != 0)
988 usb_string(udev, buffer[8], term->name,
989 sizeof term->name);
990 else
991 sprintf(term->name, "Output %u", buffer[3]);
992
993 list_add_tail(&term->list, &dev->entities);
994 break;
995
996 case VC_SELECTOR_UNIT:
997 p = buflen >= 5 ? buffer[4] : 0;
998
999 if (buflen < 5 || buflen < 6 + p) {
1000 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1001 "interface %d SELECTOR_UNIT error\n",
1002 udev->devnum, alts->desc.bInterfaceNumber);
1003 return -EINVAL;
1004 }
1005
1006 unit = kzalloc(sizeof *unit + p, GFP_KERNEL);
1007 if (unit == NULL)
1008 return -ENOMEM;
1009
1010 unit->id = buffer[3];
1011 unit->type = buffer[2];
1012 unit->selector.bNrInPins = buffer[4];
1013 unit->selector.baSourceID = (__u8 *)unit + sizeof *unit;
1014 memcpy(unit->selector.baSourceID, &buffer[5], p);
1015
1016 if (buffer[5+p] != 0)
1017 usb_string(udev, buffer[5+p], unit->name,
1018 sizeof unit->name);
1019 else
1020 sprintf(unit->name, "Selector %u", buffer[3]);
1021
1022 list_add_tail(&unit->list, &dev->entities);
1023 break;
1024
1025 case VC_PROCESSING_UNIT:
1026 n = buflen >= 8 ? buffer[7] : 0;
1027 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1028
1029 if (buflen < p + n) {
1030 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1031 "interface %d PROCESSING_UNIT error\n",
1032 udev->devnum, alts->desc.bInterfaceNumber);
1033 return -EINVAL;
1034 }
1035
1036 unit = kzalloc(sizeof *unit + n, GFP_KERNEL);
1037 if (unit == NULL)
1038 return -ENOMEM;
1039
1040 unit->id = buffer[3];
1041 unit->type = buffer[2];
1042 unit->processing.bSourceID = buffer[4];
1043 unit->processing.wMaxMultiplier =
1044 le16_to_cpup((__le16 *)&buffer[5]);
1045 unit->processing.bControlSize = buffer[7];
1046 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1047 memcpy(unit->processing.bmControls, &buffer[8], n);
1048 if (dev->uvc_version >= 0x0110)
1049 unit->processing.bmVideoStandards = buffer[9+n];
1050
1051 if (buffer[8+n] != 0)
1052 usb_string(udev, buffer[8+n], unit->name,
1053 sizeof unit->name);
1054 else
1055 sprintf(unit->name, "Processing %u", buffer[3]);
1056
1057 list_add_tail(&unit->list, &dev->entities);
1058 break;
1059
1060 case VC_EXTENSION_UNIT:
1061 p = buflen >= 22 ? buffer[21] : 0;
1062 n = buflen >= 24 + p ? buffer[22+p] : 0;
1063
1064 if (buflen < 24 + p + n) {
1065 uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1066 "interface %d EXTENSION_UNIT error\n",
1067 udev->devnum, alts->desc.bInterfaceNumber);
1068 return -EINVAL;
1069 }
1070
1071 unit = kzalloc(sizeof *unit + p + n, GFP_KERNEL);
1072 if (unit == NULL)
1073 return -ENOMEM;
1074
1075 unit->id = buffer[3];
1076 unit->type = buffer[2];
1077 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1078 unit->extension.bNumControls = buffer[20];
1079 unit->extension.bNrInPins =
1080 le16_to_cpup((__le16 *)&buffer[21]);
1081 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
1082 memcpy(unit->extension.baSourceID, &buffer[22], p);
1083 unit->extension.bControlSize = buffer[22+p];
1084 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
1085 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1086
1087 if (buffer[23+p+n] != 0)
1088 usb_string(udev, buffer[23+p+n], unit->name,
1089 sizeof unit->name);
1090 else
1091 sprintf(unit->name, "Extension %u", buffer[3]);
1092
1093 list_add_tail(&unit->list, &dev->entities);
1094 break;
1095
1096 default:
1097 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1098 "descriptor (%u)\n", buffer[2]);
1099 break;
1100 }
1101
1102 return 0;
1103}
1104
1105static int uvc_parse_control(struct uvc_device *dev)
1106{
1107 struct usb_host_interface *alts = dev->intf->cur_altsetting;
1108 unsigned char *buffer = alts->extra;
1109 int buflen = alts->extralen;
1110 int ret;
1111
1112 /* Parse the default alternate setting only, as the UVC specification
1113 * defines a single alternate setting, the default alternate setting
1114 * zero.
1115 */
1116
1117 while (buflen > 2) {
1118 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1119 buffer[1] != USB_DT_CS_INTERFACE)
1120 goto next_descriptor;
1121
1122 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1123 return ret;
1124
1125next_descriptor:
1126 buflen -= buffer[0];
1127 buffer += buffer[0];
1128 }
1129
1130 /* Check if the optional status endpoint is present. */
1131 if (alts->desc.bNumEndpoints == 1) {
1132 struct usb_host_endpoint *ep = &alts->endpoint[0];
1133 struct usb_endpoint_descriptor *desc = &ep->desc;
1134
1135 if (usb_endpoint_is_int_in(desc) &&
1136 le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1137 desc->bInterval != 0) {
1138 uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1139 "(addr %02x).\n", desc->bEndpointAddress);
1140 dev->int_ep = ep;
1141 }
1142 }
1143
1144 return 0;
1145}
1146
1147/* ------------------------------------------------------------------------
1148 * USB probe and disconnect
1149 */
1150
1151/*
1152 * Unregister the video devices.
1153 */
1154static void uvc_unregister_video(struct uvc_device *dev)
1155{
1156 if (dev->video.vdev) {
1157 if (dev->video.vdev->minor == -1)
1158 video_device_release(dev->video.vdev);
1159 else
1160 video_unregister_device(dev->video.vdev);
1161 dev->video.vdev = NULL;
1162 }
1163}
1164
1165/*
1166 * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1167 * and containing the following units:
1168 *
1169 * - a USB Streaming Output Terminal
1170 * - zero or one Processing Unit
1171 * - zero, one or mode single-input Selector Units
1172 * - zero or one multiple-input Selector Units, provided all inputs are
1173 * connected to input terminals
1174 * - zero, one or mode single-input Extension Units
1175 * - one Camera Input Terminal, or one or more External terminals.
1176 *
1177 * A side forward scan is made on each detected entity to check for additional
1178 * extension units.
1179 */
1180static int uvc_scan_chain_entity(struct uvc_video_device *video,
1181 struct uvc_entity *entity)
1182{
1183 switch (UVC_ENTITY_TYPE(entity)) {
1184 case VC_EXTENSION_UNIT:
1185 if (uvc_trace_param & UVC_TRACE_PROBE)
1186 printk(" <- XU %d", entity->id);
1187
1188 if (entity->extension.bNrInPins != 1) {
1189 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1190 "than 1 input pin.\n", entity->id);
1191 return -1;
1192 }
1193
1194 list_add_tail(&entity->chain, &video->extensions);
1195 break;
1196
1197 case VC_PROCESSING_UNIT:
1198 if (uvc_trace_param & UVC_TRACE_PROBE)
1199 printk(" <- PU %d", entity->id);
1200
1201 if (video->processing != NULL) {
1202 uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1203 "Processing Units in chain.\n");
1204 return -1;
1205 }
1206
1207 video->processing = entity;
1208 break;
1209
1210 case VC_SELECTOR_UNIT:
1211 if (uvc_trace_param & UVC_TRACE_PROBE)
1212 printk(" <- SU %d", entity->id);
1213
1214 /* Single-input selector units are ignored. */
1215 if (entity->selector.bNrInPins == 1)
1216 break;
1217
1218 if (video->selector != NULL) {
1219 uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1220 "Units in chain.\n");
1221 return -1;
1222 }
1223
1224 video->selector = entity;
1225 break;
1226
1227 case ITT_VENDOR_SPECIFIC:
1228 case ITT_CAMERA:
1229 case ITT_MEDIA_TRANSPORT_INPUT:
1230 if (uvc_trace_param & UVC_TRACE_PROBE)
1231 printk(" <- IT %d\n", entity->id);
1232
1233 list_add_tail(&entity->chain, &video->iterms);
1234 break;
1235
1236 default:
1237 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1238 "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1239 return -1;
1240 }
1241
1242 return 0;
1243}
1244
1245static int uvc_scan_chain_forward(struct uvc_video_device *video,
1246 struct uvc_entity *entity, struct uvc_entity *prev)
1247{
1248 struct uvc_entity *forward;
1249 int found;
1250
1251 /* Forward scan */
1252 forward = NULL;
1253 found = 0;
1254
1255 while (1) {
1256 forward = uvc_entity_by_reference(video->dev, entity->id,
1257 forward);
1258 if (forward == NULL)
1259 break;
1260
1261 if (UVC_ENTITY_TYPE(forward) != VC_EXTENSION_UNIT ||
1262 forward == prev)
1263 continue;
1264
1265 if (forward->extension.bNrInPins != 1) {
1266 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has"
1267 "more than 1 input pin.\n", entity->id);
1268 return -1;
1269 }
1270
1271 list_add_tail(&forward->chain, &video->extensions);
1272 if (uvc_trace_param & UVC_TRACE_PROBE) {
1273 if (!found)
1274 printk(" (-> XU");
1275
1276 printk(" %d", forward->id);
1277 found = 1;
1278 }
1279 }
1280 if (found)
1281 printk(")");
1282
1283 return 0;
1284}
1285
1286static int uvc_scan_chain_backward(struct uvc_video_device *video,
1287 struct uvc_entity *entity)
1288{
1289 struct uvc_entity *term;
1290 int id = -1, i;
1291
1292 switch (UVC_ENTITY_TYPE(entity)) {
1293 case VC_EXTENSION_UNIT:
1294 id = entity->extension.baSourceID[0];
1295 break;
1296
1297 case VC_PROCESSING_UNIT:
1298 id = entity->processing.bSourceID;
1299 break;
1300
1301 case VC_SELECTOR_UNIT:
1302 /* Single-input selector units are ignored. */
1303 if (entity->selector.bNrInPins == 1) {
1304 id = entity->selector.baSourceID[0];
1305 break;
1306 }
1307
1308 if (uvc_trace_param & UVC_TRACE_PROBE)
1309 printk(" <- IT");
1310
1311 video->selector = entity;
1312 for (i = 0; i < entity->selector.bNrInPins; ++i) {
1313 id = entity->selector.baSourceID[i];
1314 term = uvc_entity_by_id(video->dev, id);
1315 if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1316 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1317 "input %d isn't connected to an "
1318 "input terminal\n", entity->id, i);
1319 return -1;
1320 }
1321
1322 if (uvc_trace_param & UVC_TRACE_PROBE)
1323 printk(" %d", term->id);
1324
1325 list_add_tail(&term->chain, &video->iterms);
1326 uvc_scan_chain_forward(video, term, entity);
1327 }
1328
1329 if (uvc_trace_param & UVC_TRACE_PROBE)
1330 printk("\n");
1331
1332 id = 0;
1333 break;
1334 }
1335
1336 return id;
1337}
1338
1339static int uvc_scan_chain(struct uvc_video_device *video)
1340{
1341 struct uvc_entity *entity, *prev;
1342 int id;
1343
1344 entity = video->oterm;
1345 uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
1346 id = entity->output.bSourceID;
1347 while (id != 0) {
1348 prev = entity;
1349 entity = uvc_entity_by_id(video->dev, id);
1350 if (entity == NULL) {
1351 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1352 "unknown entity %d.\n", id);
1353 return -1;
1354 }
1355
1356 /* Process entity */
1357 if (uvc_scan_chain_entity(video, entity) < 0)
1358 return -1;
1359
1360 /* Forward scan */
1361 if (uvc_scan_chain_forward(video, entity, prev) < 0)
1362 return -1;
1363
1364 /* Stop when a terminal is found. */
1365 if (!UVC_ENTITY_IS_UNIT(entity))
1366 break;
1367
1368 /* Backward scan */
1369 id = uvc_scan_chain_backward(video, entity);
1370 if (id < 0)
1371 return id;
1372 }
1373
1374 /* Initialize the video buffers queue. */
1375 uvc_queue_init(&video->queue);
1376
1377 return 0;
1378}
1379
1380/*
1381 * Register the video devices.
1382 *
1383 * The driver currently supports a single video device per control interface
1384 * only. The terminal and units must match the following structure:
1385 *
1386 * ITT_CAMERA -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
1387 *
1388 * The Extension Units, if present, must have a single input pin. The
1389 * Processing Unit and Extension Units can be in any order. Additional
1390 * Extension Units connected to the main chain as single-unit branches are
1391 * also supported.
1392 */
1393static int uvc_register_video(struct uvc_device *dev)
1394{
1395 struct video_device *vdev;
1396 struct uvc_entity *term;
1397 int found = 0, ret;
1398
1399 /* Check if the control interface matches the structure we expect. */
1400 list_for_each_entry(term, &dev->entities, list) {
1401 struct uvc_streaming *streaming;
1402
1403 if (UVC_ENTITY_TYPE(term) != TT_STREAMING)
1404 continue;
1405
1406 memset(&dev->video, 0, sizeof dev->video);
1407 mutex_init(&dev->video.ctrl_mutex);
1408 INIT_LIST_HEAD(&dev->video.iterms);
1409 INIT_LIST_HEAD(&dev->video.extensions);
1410 dev->video.oterm = term;
1411 dev->video.dev = dev;
1412 if (uvc_scan_chain(&dev->video) < 0)
1413 continue;
1414
1415 list_for_each_entry(streaming, &dev->streaming, list) {
1416 if (streaming->header.bTerminalLink == term->id) {
1417 dev->video.streaming = streaming;
1418 found = 1;
1419 break;
1420 }
1421 }
1422
1423 if (found)
1424 break;
1425 }
1426
1427 if (!found) {
1428 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1429 return -1;
1430 }
1431
1432 if (uvc_trace_param & UVC_TRACE_PROBE) {
1433 uvc_printk(KERN_INFO, "Found a valid video chain (");
1434 list_for_each_entry(term, &dev->video.iterms, chain) {
1435 printk("%d", term->id);
1436 if (term->chain.next != &dev->video.iterms)
1437 printk(",");
1438 }
1439 printk(" -> %d).\n", dev->video.oterm->id);
1440 }
1441
1442 /* Initialize the streaming interface with default streaming
1443 * parameters.
1444 */
1445 if ((ret = uvc_video_init(&dev->video)) < 0) {
1446 uvc_printk(KERN_ERR, "Failed to initialize the device "
1447 "(%d).\n", ret);
1448 return ret;
1449 }
1450
1451 /* Register the device with V4L. */
1452 vdev = video_device_alloc();
1453 if (vdev == NULL)
1454 return -1;
1455
1456 /* We already hold a reference to dev->udev. The video device will be
1457 * unregistered before the reference is released, so we don't need to
1458 * get another one.
1459 */
1460 vdev->dev = &dev->intf->dev;
1461 vdev->type = 0;
1462 vdev->type2 = 0;
1463 vdev->minor = -1;
1464 vdev->fops = &uvc_fops;
1465 vdev->release = video_device_release;
1466 strncpy(vdev->name, dev->name, sizeof vdev->name);
1467
1468 /* Set the driver data before calling video_register_device, otherwise
1469 * uvc_v4l2_open might race us.
1470 *
1471 * FIXME: usb_set_intfdata hasn't been called so far. Is that a
1472 * problem ? Does any function which could be called here get
1473 * a pointer to the usb_interface ?
1474 */
1475 dev->video.vdev = vdev;
1476 video_set_drvdata(vdev, &dev->video);
1477
1478 if (video_register_device(vdev, VFL_TYPE_GRABBER, -1) < 0) {
1479 dev->video.vdev = NULL;
1480 video_device_release(vdev);
1481 return -1;
1482 }
1483
1484 return 0;
1485}
1486
1487/*
1488 * Delete the UVC device.
1489 *
1490 * Called by the kernel when the last reference to the uvc_device structure
1491 * is released.
1492 *
1493 * Unregistering the video devices is done here because every opened instance
1494 * must be closed before the device can be unregistered. An alternative would
1495 * have been to use another reference count for uvc_v4l2_open/uvc_release, and
1496 * unregister the video devices on disconnect when that reference count drops
1497 * to zero.
1498 *
1499 * As this function is called after or during disconnect(), all URBs have
1500 * already been canceled by the USB core. There is no need to kill the
1501 * interrupt URB manually.
1502 */
1503void uvc_delete(struct kref *kref)
1504{
1505 struct uvc_device *dev = container_of(kref, struct uvc_device, kref);
1506 struct list_head *p, *n;
1507
1508 /* Unregister the video device */
1509 uvc_unregister_video(dev);
1510 usb_put_intf(dev->intf);
1511 usb_put_dev(dev->udev);
1512
1513 uvc_status_cleanup(dev);
1514 uvc_ctrl_cleanup_device(dev);
1515
1516 list_for_each_safe(p, n, &dev->entities) {
1517 struct uvc_entity *entity;
1518 entity = list_entry(p, struct uvc_entity, list);
1519 kfree(entity);
1520 }
1521
1522 list_for_each_safe(p, n, &dev->streaming) {
1523 struct uvc_streaming *streaming;
1524 streaming = list_entry(p, struct uvc_streaming, list);
1525 usb_driver_release_interface(&uvc_driver.driver,
1526 streaming->intf);
1527 usb_put_intf(streaming->intf);
1528 kfree(streaming->format);
1529 kfree(streaming->header.bmaControls);
1530 kfree(streaming);
1531 }
1532
1533 kfree(dev);
1534}
1535
1536static int uvc_probe(struct usb_interface *intf,
1537 const struct usb_device_id *id)
1538{
1539 struct usb_device *udev = interface_to_usbdev(intf);
1540 struct uvc_device *dev;
1541 int ret;
1542
1543 if (id->idVendor && id->idProduct)
1544 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1545 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1546 id->idProduct);
1547 else
1548 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1549 udev->devpath);
1550
1551 /* Allocate memory for the device and initialize it */
1552 if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1553 return -ENOMEM;
1554
1555 INIT_LIST_HEAD(&dev->entities);
1556 INIT_LIST_HEAD(&dev->streaming);
1557 kref_init(&dev->kref);
1558
1559 dev->udev = usb_get_dev(udev);
1560 dev->intf = usb_get_intf(intf);
1561 dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1562 dev->quirks = id->driver_info | uvc_quirks_param;
1563
1564 if (udev->product != NULL)
1565 strncpy(dev->name, udev->product, sizeof dev->name);
1566 else
1567 snprintf(dev->name, sizeof dev->name,
1568 "UVC Camera (%04x:%04x)",
1569 le16_to_cpu(udev->descriptor.idVendor),
1570 le16_to_cpu(udev->descriptor.idProduct));
1571
1572 /* Parse the Video Class control descriptor */
1573 if (uvc_parse_control(dev) < 0) {
1574 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1575 "descriptors.\n");
1576 goto error;
1577 }
1578
1579 uvc_printk(KERN_INFO, "Found UVC %u.%02u device %s (%04x:%04x)\n",
1580 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1581 udev->product ? udev->product : "<unnamed>",
1582 le16_to_cpu(udev->descriptor.idVendor),
1583 le16_to_cpu(udev->descriptor.idProduct));
1584
1585 if (uvc_quirks_param != 0) {
1586 uvc_printk(KERN_INFO, "Forcing device quirks 0x%x by module "
1587 "parameter for testing purpose.\n", uvc_quirks_param);
1588 uvc_printk(KERN_INFO, "Please report required quirks to the "
1589 "linux-uvc-devel mailing list.\n");
1590 }
1591
1592 /* Initialize controls */
1593 if (uvc_ctrl_init_device(dev) < 0)
1594 goto error;
1595
1596 /* Register the video devices */
1597 if (uvc_register_video(dev) < 0)
1598 goto error;
1599
1600 /* Save our data pointer in the interface data */
1601 usb_set_intfdata(intf, dev);
1602
1603 /* Initialize the interrupt URB */
1604 if ((ret = uvc_status_init(dev)) < 0) {
1605 uvc_printk(KERN_INFO, "Unable to initialize the status "
1606 "endpoint (%d), status interrupt will not be "
1607 "supported.\n", ret);
1608 }
1609
1610 uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1611 return 0;
1612
1613error:
1614 kref_put(&dev->kref, uvc_delete);
1615 return -ENODEV;
1616}
1617
1618static void uvc_disconnect(struct usb_interface *intf)
1619{
1620 struct uvc_device *dev = usb_get_intfdata(intf);
1621
1622 /* Set the USB interface data to NULL. This can be done outside the
1623 * lock, as there's no other reader.
1624 */
1625 usb_set_intfdata(intf, NULL);
1626
1627 if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOSTREAMING)
1628 return;
1629
1630 /* uvc_v4l2_open() might race uvc_disconnect(). A static driver-wide
1631 * lock is needed to prevent uvc_disconnect from releasing its
1632 * reference to the uvc_device instance after uvc_v4l2_open() received
1633 * the pointer to the device (video_devdata) but before it got the
1634 * chance to increase the reference count (kref_get).
1635 */
1636 mutex_lock(&uvc_driver.open_mutex);
1637
1638 dev->state |= UVC_DEV_DISCONNECTED;
1639 kref_put(&dev->kref, uvc_delete);
1640
1641 mutex_unlock(&uvc_driver.open_mutex);
1642}
1643
1644static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1645{
1646 struct uvc_device *dev = usb_get_intfdata(intf);
1647
1648 uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1649 intf->cur_altsetting->desc.bInterfaceNumber);
1650
1651 /* Controls are cached on the fly so they don't need to be saved. */
1652 if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL)
1653 return uvc_status_suspend(dev);
1654
1655 if (dev->video.streaming->intf != intf) {
1656 uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB "
1657 "interface mismatch.\n");
1658 return -EINVAL;
1659 }
1660
1661 return uvc_video_suspend(&dev->video);
1662}
1663
1664static int uvc_resume(struct usb_interface *intf)
1665{
1666 struct uvc_device *dev = usb_get_intfdata(intf);
1667 int ret;
1668
1669 uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1670 intf->cur_altsetting->desc.bInterfaceNumber);
1671
1672 if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL) {
1673 if ((ret = uvc_ctrl_resume_device(dev)) < 0)
1674 return ret;
1675
1676 return uvc_status_resume(dev);
1677 }
1678
1679 if (dev->video.streaming->intf != intf) {
1680 uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB "
1681 "interface mismatch.\n");
1682 return -EINVAL;
1683 }
1684
1685 return uvc_video_resume(&dev->video);
1686}
1687
1688/* ------------------------------------------------------------------------
1689 * Driver initialization and cleanup
1690 */
1691
1692/*
1693 * The Logitech cameras listed below have their interface class set to
1694 * VENDOR_SPEC because they don't announce themselves as UVC devices, even
1695 * though they are compliant.
1696 */
1697static struct usb_device_id uvc_ids[] = {
1698 /* ALi M5606 (Clevo M540SR) */
1699 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1700 | USB_DEVICE_ID_MATCH_INT_INFO,
1701 .idVendor = 0x0402,
1702 .idProduct = 0x5606,
1703 .bInterfaceClass = USB_CLASS_VIDEO,
1704 .bInterfaceSubClass = 1,
1705 .bInterfaceProtocol = 0,
1706 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1707 /* Creative Live! Optia */
1708 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1709 | USB_DEVICE_ID_MATCH_INT_INFO,
1710 .idVendor = 0x041e,
1711 .idProduct = 0x4057,
1712 .bInterfaceClass = USB_CLASS_VIDEO,
1713 .bInterfaceSubClass = 1,
1714 .bInterfaceProtocol = 0,
1715 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1716 /* Microsoft Lifecam NX-6000 */
1717 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1718 | USB_DEVICE_ID_MATCH_INT_INFO,
1719 .idVendor = 0x045e,
1720 .idProduct = 0x00f8,
1721 .bInterfaceClass = USB_CLASS_VIDEO,
1722 .bInterfaceSubClass = 1,
1723 .bInterfaceProtocol = 0,
1724 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1725 /* Microsoft Lifecam VX-7000 */
1726 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1727 | USB_DEVICE_ID_MATCH_INT_INFO,
1728 .idVendor = 0x045e,
1729 .idProduct = 0x0723,
1730 .bInterfaceClass = USB_CLASS_VIDEO,
1731 .bInterfaceSubClass = 1,
1732 .bInterfaceProtocol = 0,
1733 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1734 /* Logitech Quickcam Fusion */
1735 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1736 | USB_DEVICE_ID_MATCH_INT_INFO,
1737 .idVendor = 0x046d,
1738 .idProduct = 0x08c1,
1739 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1740 .bInterfaceSubClass = 1,
1741 .bInterfaceProtocol = 0 },
1742 /* Logitech Quickcam Orbit MP */
1743 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1744 | USB_DEVICE_ID_MATCH_INT_INFO,
1745 .idVendor = 0x046d,
1746 .idProduct = 0x08c2,
1747 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1748 .bInterfaceSubClass = 1,
1749 .bInterfaceProtocol = 0 },
1750 /* Logitech Quickcam Pro for Notebook */
1751 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1752 | USB_DEVICE_ID_MATCH_INT_INFO,
1753 .idVendor = 0x046d,
1754 .idProduct = 0x08c3,
1755 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1756 .bInterfaceSubClass = 1,
1757 .bInterfaceProtocol = 0 },
1758 /* Logitech Quickcam Pro 5000 */
1759 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1760 | USB_DEVICE_ID_MATCH_INT_INFO,
1761 .idVendor = 0x046d,
1762 .idProduct = 0x08c5,
1763 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1764 .bInterfaceSubClass = 1,
1765 .bInterfaceProtocol = 0 },
1766 /* Logitech Quickcam OEM Dell Notebook */
1767 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1768 | USB_DEVICE_ID_MATCH_INT_INFO,
1769 .idVendor = 0x046d,
1770 .idProduct = 0x08c6,
1771 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1772 .bInterfaceSubClass = 1,
1773 .bInterfaceProtocol = 0 },
1774 /* Logitech Quickcam OEM Cisco VT Camera II */
1775 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1776 | USB_DEVICE_ID_MATCH_INT_INFO,
1777 .idVendor = 0x046d,
1778 .idProduct = 0x08c7,
1779 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
1780 .bInterfaceSubClass = 1,
1781 .bInterfaceProtocol = 0 },
1782 /* Apple Built-In iSight */
1783 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1784 | USB_DEVICE_ID_MATCH_INT_INFO,
1785 .idVendor = 0x05ac,
1786 .idProduct = 0x8501,
1787 .bInterfaceClass = USB_CLASS_VIDEO,
1788 .bInterfaceSubClass = 1,
1789 .bInterfaceProtocol = 0,
1790 .driver_info = UVC_QUIRK_PROBE_MINMAX
1791 | UVC_QUIRK_BUILTIN_ISIGHT },
1792 /* Genesys Logic USB 2.0 PC Camera */
1793 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1794 | USB_DEVICE_ID_MATCH_INT_INFO,
1795 .idVendor = 0x05e3,
1796 .idProduct = 0x0505,
1797 .bInterfaceClass = USB_CLASS_VIDEO,
1798 .bInterfaceSubClass = 1,
1799 .bInterfaceProtocol = 0,
1800 .driver_info = UVC_QUIRK_STREAM_NO_FID },
1801 /* Silicon Motion SM371 */
1802 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1803 | USB_DEVICE_ID_MATCH_INT_INFO,
1804 .idVendor = 0x090c,
1805 .idProduct = 0xb371,
1806 .bInterfaceClass = USB_CLASS_VIDEO,
1807 .bInterfaceSubClass = 1,
1808 .bInterfaceProtocol = 0,
1809 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1810 /* MT6227 */
1811 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1812 | USB_DEVICE_ID_MATCH_INT_INFO,
1813 .idVendor = 0x0e8d,
1814 .idProduct = 0x0004,
1815 .bInterfaceClass = USB_CLASS_VIDEO,
1816 .bInterfaceSubClass = 1,
1817 .bInterfaceProtocol = 0,
1818 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1819 /* Syntek (HP Spartan) */
1820 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1821 | USB_DEVICE_ID_MATCH_INT_INFO,
1822 .idVendor = 0x174f,
1823 .idProduct = 0x5212,
1824 .bInterfaceClass = USB_CLASS_VIDEO,
1825 .bInterfaceSubClass = 1,
1826 .bInterfaceProtocol = 0,
1827 .driver_info = UVC_QUIRK_STREAM_NO_FID },
1828 /* Syntek (Asus U3S) */
1829 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1830 | USB_DEVICE_ID_MATCH_INT_INFO,
1831 .idVendor = 0x174f,
1832 .idProduct = 0x8a33,
1833 .bInterfaceClass = USB_CLASS_VIDEO,
1834 .bInterfaceSubClass = 1,
1835 .bInterfaceProtocol = 0,
1836 .driver_info = UVC_QUIRK_STREAM_NO_FID },
1837 /* Ecamm Pico iMage */
1838 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1839 | USB_DEVICE_ID_MATCH_INT_INFO,
1840 .idVendor = 0x18cd,
1841 .idProduct = 0xcafe,
1842 .bInterfaceClass = USB_CLASS_VIDEO,
1843 .bInterfaceSubClass = 1,
1844 .bInterfaceProtocol = 0,
1845 .driver_info = UVC_QUIRK_PROBE_EXTRAFIELDS },
1846 /* Bodelin ProScopeHR */
1847 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1848 | USB_DEVICE_ID_MATCH_DEV_HI
1849 | USB_DEVICE_ID_MATCH_INT_INFO,
1850 .idVendor = 0x19ab,
1851 .idProduct = 0x1000,
1852 .bcdDevice_hi = 0x0126,
1853 .bInterfaceClass = USB_CLASS_VIDEO,
1854 .bInterfaceSubClass = 1,
1855 .bInterfaceProtocol = 0,
1856 .driver_info = UVC_QUIRK_STATUS_INTERVAL },
1857 /* SiGma Micro USB Web Camera */
1858 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1859 | USB_DEVICE_ID_MATCH_INT_INFO,
1860 .idVendor = 0x1c4f,
1861 .idProduct = 0x3000,
1862 .bInterfaceClass = USB_CLASS_VIDEO,
1863 .bInterfaceSubClass = 1,
1864 .bInterfaceProtocol = 0,
1865 .driver_info = UVC_QUIRK_PROBE_MINMAX
1866 | UVC_QUIRK_IGNORE_SELECTOR_UNIT},
1867 /* Acer OEM Webcam - Unknown vendor */
1868 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1869 | USB_DEVICE_ID_MATCH_INT_INFO,
1870 .idVendor = 0x5986,
1871 .idProduct = 0x0100,
1872 .bInterfaceClass = USB_CLASS_VIDEO,
1873 .bInterfaceSubClass = 1,
1874 .bInterfaceProtocol = 0,
1875 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1876 /* Packard Bell OEM Webcam */
1877 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1878 | USB_DEVICE_ID_MATCH_INT_INFO,
1879 .idVendor = 0x5986,
1880 .idProduct = 0x0101,
1881 .bInterfaceClass = USB_CLASS_VIDEO,
1882 .bInterfaceSubClass = 1,
1883 .bInterfaceProtocol = 0,
1884 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1885 /* Acer Crystal Eye webcam */
1886 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1887 | USB_DEVICE_ID_MATCH_INT_INFO,
1888 .idVendor = 0x5986,
1889 .idProduct = 0x0102,
1890 .bInterfaceClass = USB_CLASS_VIDEO,
1891 .bInterfaceSubClass = 1,
1892 .bInterfaceProtocol = 0,
1893 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1894 /* Acer OrbiCam - Unknown vendor */
1895 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
1896 | USB_DEVICE_ID_MATCH_INT_INFO,
1897 .idVendor = 0x5986,
1898 .idProduct = 0x0200,
1899 .bInterfaceClass = USB_CLASS_VIDEO,
1900 .bInterfaceSubClass = 1,
1901 .bInterfaceProtocol = 0,
1902 .driver_info = UVC_QUIRK_PROBE_MINMAX },
1903 /* Generic USB Video Class */
1904 { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
1905 {}
1906};
1907
1908MODULE_DEVICE_TABLE(usb, uvc_ids);
1909
1910struct uvc_driver uvc_driver = {
1911 .driver = {
1912 .name = "uvcvideo",
1913 .probe = uvc_probe,
1914 .disconnect = uvc_disconnect,
1915 .suspend = uvc_suspend,
1916 .resume = uvc_resume,
1917 .id_table = uvc_ids,
1918 .supports_autosuspend = 1,
1919 },
1920};
1921
1922static int __init uvc_init(void)
1923{
1924 int result;
1925
1926 INIT_LIST_HEAD(&uvc_driver.devices);
1927 INIT_LIST_HEAD(&uvc_driver.controls);
1928 mutex_init(&uvc_driver.open_mutex);
1929 mutex_init(&uvc_driver.ctrl_mutex);
1930
1931 uvc_ctrl_init();
1932
1933 result = usb_register(&uvc_driver.driver);
1934 if (result == 0)
1935 printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
1936 return result;
1937}
1938
1939static void __exit uvc_cleanup(void)
1940{
1941 usb_deregister(&uvc_driver.driver);
1942}
1943
1944module_init(uvc_init);
1945module_exit(uvc_cleanup);
1946
1947module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
1948MODULE_PARM_DESC(quirks, "Forced device quirks");
1949module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
1950MODULE_PARM_DESC(trace, "Trace level bitmask");
1951
1952MODULE_AUTHOR(DRIVER_AUTHOR);
1953MODULE_DESCRIPTION(DRIVER_DESC);
1954MODULE_LICENSE("GPL");
1955MODULE_VERSION(DRIVER_VERSION);
Linux kernel - Deliverables
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