1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * uvc_v4l2.c -- USB Video Class Gadget driver
4 *
5 * Copyright (C) 2009-2010
6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 */
8
9 #include <linux/device.h>
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
12 #include <linux/list.h>
13 #include <linux/usb/g_uvc.h>
14 #include <linux/usb/uvc.h>
15 #include <linux/videodev2.h>
16 #include <linux/vmalloc.h>
17 #include <linux/wait.h>
18
19 #include <media/v4l2-dev.h>
20 #include <media/v4l2-event.h>
21 #include <media/v4l2-ioctl.h>
22
23 #include "f_uvc.h"
24 #include "uvc.h"
25 #include "uvc_queue.h"
26 #include "uvc_video.h"
27 #include "uvc_v4l2.h"
28 #include "uvc_configfs.h"
29
to_uvc_format(struct uvcg_format * uformat)30 static const struct uvc_format_desc *to_uvc_format(struct uvcg_format *uformat)
31 {
32 char guid[16] = UVC_GUID_FORMAT_MJPEG;
33 const struct uvc_format_desc *format;
34 struct uvcg_uncompressed *unc;
35
36 if (uformat->type == UVCG_UNCOMPRESSED) {
37 unc = to_uvcg_uncompressed(&uformat->group.cg_item);
38 if (!unc)
39 return ERR_PTR(-EINVAL);
40
41 memcpy(guid, unc->desc.guidFormat, sizeof(guid));
42 }
43
44 format = uvc_format_by_guid(guid);
45 if (!format)
46 return ERR_PTR(-EINVAL);
47
48 return format;
49 }
50
uvc_v4l2_get_bytesperline(struct uvcg_format * uformat,struct uvcg_frame * uframe)51 static int uvc_v4l2_get_bytesperline(struct uvcg_format *uformat,
52 struct uvcg_frame *uframe)
53 {
54 struct uvcg_uncompressed *u;
55
56 if (uformat->type == UVCG_UNCOMPRESSED) {
57 u = to_uvcg_uncompressed(&uformat->group.cg_item);
58 if (!u)
59 return 0;
60
61 return u->desc.bBitsPerPixel * uframe->frame.w_width / 8;
62 }
63
64 return 0;
65 }
66
uvc_get_frame_size(struct uvcg_format * uformat,struct uvcg_frame * uframe)67 static int uvc_get_frame_size(struct uvcg_format *uformat,
68 struct uvcg_frame *uframe)
69 {
70 unsigned int bpl = uvc_v4l2_get_bytesperline(uformat, uframe);
71
72 return bpl ? bpl * uframe->frame.w_height :
73 uframe->frame.dw_max_video_frame_buffer_size;
74 }
75
find_format_by_index(struct uvc_device * uvc,int index)76 static struct uvcg_format *find_format_by_index(struct uvc_device *uvc, int index)
77 {
78 struct uvcg_format_ptr *format;
79 struct uvcg_format *uformat = NULL;
80 int i = 1;
81
82 list_for_each_entry(format, &uvc->header->formats, entry) {
83 if (index == i) {
84 uformat = format->fmt;
85 break;
86 }
87 i++;
88 }
89
90 return uformat;
91 }
92
find_frame_by_index(struct uvc_device * uvc,struct uvcg_format * uformat,int index)93 static struct uvcg_frame *find_frame_by_index(struct uvc_device *uvc,
94 struct uvcg_format *uformat,
95 int index)
96 {
97 struct uvcg_format_ptr *format;
98 struct uvcg_frame_ptr *frame;
99 struct uvcg_frame *uframe = NULL;
100
101 list_for_each_entry(format, &uvc->header->formats, entry) {
102 if (format->fmt->type != uformat->type)
103 continue;
104 list_for_each_entry(frame, &format->fmt->frames, entry) {
105 if (index == frame->frm->frame.b_frame_index) {
106 uframe = frame->frm;
107 break;
108 }
109 }
110 }
111
112 return uframe;
113 }
114
find_format_by_pix(struct uvc_device * uvc,u32 pixelformat)115 static struct uvcg_format *find_format_by_pix(struct uvc_device *uvc,
116 u32 pixelformat)
117 {
118 struct uvcg_format_ptr *format;
119 struct uvcg_format *uformat = NULL;
120
121 list_for_each_entry(format, &uvc->header->formats, entry) {
122 const struct uvc_format_desc *fmtdesc = to_uvc_format(format->fmt);
123
124 if (IS_ERR(fmtdesc))
125 continue;
126
127 if (fmtdesc->fcc == pixelformat) {
128 uformat = format->fmt;
129 break;
130 }
131 }
132
133 return uformat;
134 }
135
find_closest_frame_by_size(struct uvc_device * uvc,struct uvcg_format * uformat,u16 rw,u16 rh)136 static struct uvcg_frame *find_closest_frame_by_size(struct uvc_device *uvc,
137 struct uvcg_format *uformat,
138 u16 rw, u16 rh)
139 {
140 struct uvc_video *video = &uvc->video;
141 struct uvcg_format_ptr *format;
142 struct uvcg_frame_ptr *frame;
143 struct uvcg_frame *uframe = NULL;
144 unsigned int d, maxd;
145
146 /* Find the closest image size. The distance between image sizes is
147 * the size in pixels of the non-overlapping regions between the
148 * requested size and the frame-specified size.
149 */
150 maxd = (unsigned int)-1;
151
152 list_for_each_entry(format, &uvc->header->formats, entry) {
153 if (format->fmt->type != uformat->type)
154 continue;
155
156 list_for_each_entry(frame, &format->fmt->frames, entry) {
157 u16 w, h;
158
159 w = frame->frm->frame.w_width;
160 h = frame->frm->frame.w_height;
161
162 d = min(w, rw) * min(h, rh);
163 d = w*h + rw*rh - 2*d;
164 if (d < maxd) {
165 maxd = d;
166 uframe = frame->frm;
167 }
168
169 if (maxd == 0)
170 break;
171 }
172 }
173
174 if (!uframe)
175 uvcg_dbg(&video->uvc->func, "Unsupported size %ux%u\n", rw, rh);
176
177 return uframe;
178 }
179
180 /* --------------------------------------------------------------------------
181 * Requests handling
182 */
183
184 static int
uvc_send_response(struct uvc_device * uvc,struct uvc_request_data * data)185 uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
186 {
187 struct usb_composite_dev *cdev = uvc->func.config->cdev;
188 struct usb_request *req = uvc->control_req;
189
190 if (data->length < 0)
191 return usb_ep_set_halt(cdev->gadget->ep0);
192
193 req->length = min_t(unsigned int, uvc->event_length, data->length);
194 req->zero = data->length < uvc->event_length;
195
196 memcpy(req->buf, data->data, req->length);
197
198 return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);
199 }
200
201 /* --------------------------------------------------------------------------
202 * V4L2 ioctls
203 */
204
205 static int
uvc_v4l2_querycap(struct file * file,void * fh,struct v4l2_capability * cap)206 uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
207 {
208 struct video_device *vdev = video_devdata(file);
209 struct uvc_device *uvc = video_get_drvdata(vdev);
210 struct usb_composite_dev *cdev = uvc->func.config->cdev;
211
212 strscpy(cap->driver, "g_uvc", sizeof(cap->driver));
213 strscpy(cap->card, cdev->gadget->name, sizeof(cap->card));
214 strscpy(cap->bus_info, dev_name(&cdev->gadget->dev),
215 sizeof(cap->bus_info));
216 return 0;
217 }
218
219 static int
uvc_v4l2_get_format(struct file * file,void * fh,struct v4l2_format * fmt)220 uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
221 {
222 struct video_device *vdev = video_devdata(file);
223 struct uvc_device *uvc = video_get_drvdata(vdev);
224 struct uvc_video *video = &uvc->video;
225
226 fmt->fmt.pix.pixelformat = video->fcc;
227 fmt->fmt.pix.width = video->width;
228 fmt->fmt.pix.height = video->height;
229 fmt->fmt.pix.field = V4L2_FIELD_NONE;
230 fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
231 fmt->fmt.pix.sizeimage = video->imagesize;
232 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
233 fmt->fmt.pix.priv = 0;
234
235 return 0;
236 }
237
238 static int
uvc_v4l2_try_format(struct file * file,void * fh,struct v4l2_format * fmt)239 uvc_v4l2_try_format(struct file *file, void *fh, struct v4l2_format *fmt)
240 {
241 struct video_device *vdev = video_devdata(file);
242 struct uvc_device *uvc = video_get_drvdata(vdev);
243 struct uvc_video *video = &uvc->video;
244 struct uvcg_format *uformat;
245 struct uvcg_frame *uframe;
246 const struct uvc_format_desc *fmtdesc;
247 u8 *fcc;
248
249 if (fmt->type != video->queue.queue.type)
250 return -EINVAL;
251
252 fcc = (u8 *)&fmt->fmt.pix.pixelformat;
253 uvcg_dbg(&uvc->func, "Trying format 0x%08x (%c%c%c%c): %ux%u\n",
254 fmt->fmt.pix.pixelformat,
255 fcc[0], fcc[1], fcc[2], fcc[3],
256 fmt->fmt.pix.width, fmt->fmt.pix.height);
257
258 uformat = find_format_by_pix(uvc, fmt->fmt.pix.pixelformat);
259 if (!uformat)
260 return -EINVAL;
261
262 uframe = find_closest_frame_by_size(uvc, uformat,
263 fmt->fmt.pix.width, fmt->fmt.pix.height);
264 if (!uframe)
265 return -EINVAL;
266
267 fmt->fmt.pix.width = uframe->frame.w_width;
268 fmt->fmt.pix.height = uframe->frame.w_height;
269 fmt->fmt.pix.field = V4L2_FIELD_NONE;
270 fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(uformat, uframe);
271 fmt->fmt.pix.sizeimage = uvc_get_frame_size(uformat, uframe);
272 fmtdesc = to_uvc_format(uformat);
273 if (IS_ERR(fmtdesc))
274 return PTR_ERR(fmtdesc);
275 fmt->fmt.pix.pixelformat = fmtdesc->fcc;
276 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
277 fmt->fmt.pix.priv = 0;
278
279 return 0;
280 }
281
282 static int
uvc_v4l2_set_format(struct file * file,void * fh,struct v4l2_format * fmt)283 uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
284 {
285 struct video_device *vdev = video_devdata(file);
286 struct uvc_device *uvc = video_get_drvdata(vdev);
287 struct uvc_video *video = &uvc->video;
288 int ret;
289
290 ret = uvc_v4l2_try_format(file, fh, fmt);
291 if (ret)
292 return ret;
293
294 video->fcc = fmt->fmt.pix.pixelformat;
295 video->bpp = fmt->fmt.pix.bytesperline * 8 / video->width;
296 video->width = fmt->fmt.pix.width;
297 video->height = fmt->fmt.pix.height;
298 video->imagesize = fmt->fmt.pix.sizeimage;
299
300 return ret;
301 }
302
303 static int
uvc_v4l2_enum_frameintervals(struct file * file,void * fh,struct v4l2_frmivalenum * fival)304 uvc_v4l2_enum_frameintervals(struct file *file, void *fh,
305 struct v4l2_frmivalenum *fival)
306 {
307 struct video_device *vdev = video_devdata(file);
308 struct uvc_device *uvc = video_get_drvdata(vdev);
309 struct uvcg_format *uformat = NULL;
310 struct uvcg_frame *uframe = NULL;
311 struct uvcg_frame_ptr *frame;
312
313 uformat = find_format_by_pix(uvc, fival->pixel_format);
314 if (!uformat)
315 return -EINVAL;
316
317 list_for_each_entry(frame, &uformat->frames, entry) {
318 if (frame->frm->frame.w_width == fival->width &&
319 frame->frm->frame.w_height == fival->height) {
320 uframe = frame->frm;
321 break;
322 }
323 }
324 if (!uframe)
325 return -EINVAL;
326
327 if (fival->index >= uframe->frame.b_frame_interval_type)
328 return -EINVAL;
329
330 fival->discrete.numerator =
331 uframe->dw_frame_interval[fival->index];
332
333 /* TODO: handle V4L2_FRMIVAL_TYPE_STEPWISE */
334 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
335 fival->discrete.denominator = 10000000;
336 v4l2_simplify_fraction(&fival->discrete.numerator,
337 &fival->discrete.denominator, 8, 333);
338
339 return 0;
340 }
341
342 static int
uvc_v4l2_enum_framesizes(struct file * file,void * fh,struct v4l2_frmsizeenum * fsize)343 uvc_v4l2_enum_framesizes(struct file *file, void *fh,
344 struct v4l2_frmsizeenum *fsize)
345 {
346 struct video_device *vdev = video_devdata(file);
347 struct uvc_device *uvc = video_get_drvdata(vdev);
348 struct uvcg_format *uformat = NULL;
349 struct uvcg_frame *uframe = NULL;
350
351 uformat = find_format_by_pix(uvc, fsize->pixel_format);
352 if (!uformat)
353 return -EINVAL;
354
355 if (fsize->index >= uformat->num_frames)
356 return -EINVAL;
357
358 uframe = find_frame_by_index(uvc, uformat, fsize->index + 1);
359 if (!uframe)
360 return -EINVAL;
361
362 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
363 fsize->discrete.width = uframe->frame.w_width;
364 fsize->discrete.height = uframe->frame.w_height;
365
366 return 0;
367 }
368
369 static int
uvc_v4l2_enum_format(struct file * file,void * fh,struct v4l2_fmtdesc * f)370 uvc_v4l2_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
371 {
372 struct video_device *vdev = video_devdata(file);
373 struct uvc_device *uvc = video_get_drvdata(vdev);
374 const struct uvc_format_desc *fmtdesc;
375 struct uvcg_format *uformat;
376
377 if (f->index >= uvc->header->num_fmt)
378 return -EINVAL;
379
380 uformat = find_format_by_index(uvc, f->index + 1);
381 if (!uformat)
382 return -EINVAL;
383
384 fmtdesc = to_uvc_format(uformat);
385 if (IS_ERR(fmtdesc))
386 return PTR_ERR(fmtdesc);
387
388 f->pixelformat = fmtdesc->fcc;
389
390 return 0;
391 }
392
393 static int
uvc_v4l2_reqbufs(struct file * file,void * fh,struct v4l2_requestbuffers * b)394 uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
395 {
396 struct video_device *vdev = video_devdata(file);
397 struct uvc_device *uvc = video_get_drvdata(vdev);
398 struct uvc_video *video = &uvc->video;
399
400 if (b->type != video->queue.queue.type)
401 return -EINVAL;
402
403 return uvcg_alloc_buffers(&video->queue, b);
404 }
405
406 static int
uvc_v4l2_querybuf(struct file * file,void * fh,struct v4l2_buffer * b)407 uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
408 {
409 struct video_device *vdev = video_devdata(file);
410 struct uvc_device *uvc = video_get_drvdata(vdev);
411 struct uvc_video *video = &uvc->video;
412
413 return uvcg_query_buffer(&video->queue, b);
414 }
415
416 static int
uvc_v4l2_qbuf(struct file * file,void * fh,struct v4l2_buffer * b)417 uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
418 {
419 struct video_device *vdev = video_devdata(file);
420 struct uvc_device *uvc = video_get_drvdata(vdev);
421 struct uvc_video *video = &uvc->video;
422 int ret;
423
424 ret = uvcg_queue_buffer(&video->queue, b);
425 if (ret < 0)
426 return ret;
427
428 if (uvc->state == UVC_STATE_STREAMING)
429 queue_work(video->async_wq, &video->pump);
430
431 return ret;
432 }
433
434 static int
uvc_v4l2_dqbuf(struct file * file,void * fh,struct v4l2_buffer * b)435 uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
436 {
437 struct video_device *vdev = video_devdata(file);
438 struct uvc_device *uvc = video_get_drvdata(vdev);
439 struct uvc_video *video = &uvc->video;
440
441 return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
442 }
443
444 static int
uvc_v4l2_streamon(struct file * file,void * fh,enum v4l2_buf_type type)445 uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
446 {
447 struct video_device *vdev = video_devdata(file);
448 struct uvc_device *uvc = video_get_drvdata(vdev);
449 struct uvc_video *video = &uvc->video;
450 int ret;
451
452 if (type != video->queue.queue.type)
453 return -EINVAL;
454
455 /* Enable UVC video. */
456 ret = uvcg_video_enable(video, 1);
457 if (ret < 0)
458 return ret;
459
460 /*
461 * Complete the alternate setting selection setup phase now that
462 * userspace is ready to provide video frames.
463 */
464 uvc_function_setup_continue(uvc);
465 uvc->state = UVC_STATE_STREAMING;
466
467 return 0;
468 }
469
470 static int
uvc_v4l2_streamoff(struct file * file,void * fh,enum v4l2_buf_type type)471 uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
472 {
473 struct video_device *vdev = video_devdata(file);
474 struct uvc_device *uvc = video_get_drvdata(vdev);
475 struct uvc_video *video = &uvc->video;
476
477 if (type != video->queue.queue.type)
478 return -EINVAL;
479
480 return uvcg_video_enable(video, 0);
481 }
482
483 static int
uvc_v4l2_subscribe_event(struct v4l2_fh * fh,const struct v4l2_event_subscription * sub)484 uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
485 const struct v4l2_event_subscription *sub)
486 {
487 struct uvc_device *uvc = video_get_drvdata(fh->vdev);
488 struct uvc_file_handle *handle = to_uvc_file_handle(fh);
489 int ret;
490
491 if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
492 return -EINVAL;
493
494 if (sub->type == UVC_EVENT_SETUP && uvc->func_connected)
495 return -EBUSY;
496
497 ret = v4l2_event_subscribe(fh, sub, 2, NULL);
498 if (ret < 0)
499 return ret;
500
501 if (sub->type == UVC_EVENT_SETUP) {
502 uvc->func_connected = true;
503 handle->is_uvc_app_handle = true;
504 uvc_function_connect(uvc);
505 }
506
507 return 0;
508 }
509
uvc_v4l2_disable(struct uvc_device * uvc)510 static void uvc_v4l2_disable(struct uvc_device *uvc)
511 {
512 uvc_function_disconnect(uvc);
513 uvcg_video_enable(&uvc->video, 0);
514 uvcg_free_buffers(&uvc->video.queue);
515 uvc->func_connected = false;
516 wake_up_interruptible(&uvc->func_connected_queue);
517 }
518
519 static int
uvc_v4l2_unsubscribe_event(struct v4l2_fh * fh,const struct v4l2_event_subscription * sub)520 uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
521 const struct v4l2_event_subscription *sub)
522 {
523 struct uvc_device *uvc = video_get_drvdata(fh->vdev);
524 struct uvc_file_handle *handle = to_uvc_file_handle(fh);
525 int ret;
526
527 ret = v4l2_event_unsubscribe(fh, sub);
528 if (ret < 0)
529 return ret;
530
531 if (sub->type == UVC_EVENT_SETUP && handle->is_uvc_app_handle) {
532 uvc_v4l2_disable(uvc);
533 handle->is_uvc_app_handle = false;
534 }
535
536 return 0;
537 }
538
539 static long
uvc_v4l2_ioctl_default(struct file * file,void * fh,bool valid_prio,unsigned int cmd,void * arg)540 uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
541 unsigned int cmd, void *arg)
542 {
543 struct video_device *vdev = video_devdata(file);
544 struct uvc_device *uvc = video_get_drvdata(vdev);
545
546 switch (cmd) {
547 case UVCIOC_SEND_RESPONSE:
548 return uvc_send_response(uvc, arg);
549
550 default:
551 return -ENOIOCTLCMD;
552 }
553 }
554
555 const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
556 .vidioc_querycap = uvc_v4l2_querycap,
557 .vidioc_try_fmt_vid_out = uvc_v4l2_try_format,
558 .vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
559 .vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
560 .vidioc_enum_frameintervals = uvc_v4l2_enum_frameintervals,
561 .vidioc_enum_framesizes = uvc_v4l2_enum_framesizes,
562 .vidioc_enum_fmt_vid_out = uvc_v4l2_enum_format,
563 .vidioc_reqbufs = uvc_v4l2_reqbufs,
564 .vidioc_querybuf = uvc_v4l2_querybuf,
565 .vidioc_qbuf = uvc_v4l2_qbuf,
566 .vidioc_dqbuf = uvc_v4l2_dqbuf,
567 .vidioc_streamon = uvc_v4l2_streamon,
568 .vidioc_streamoff = uvc_v4l2_streamoff,
569 .vidioc_subscribe_event = uvc_v4l2_subscribe_event,
570 .vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
571 .vidioc_default = uvc_v4l2_ioctl_default,
572 };
573
574 /* --------------------------------------------------------------------------
575 * V4L2
576 */
577
578 static int
uvc_v4l2_open(struct file * file)579 uvc_v4l2_open(struct file *file)
580 {
581 struct video_device *vdev = video_devdata(file);
582 struct uvc_device *uvc = video_get_drvdata(vdev);
583 struct uvc_file_handle *handle;
584
585 handle = kzalloc(sizeof(*handle), GFP_KERNEL);
586 if (handle == NULL)
587 return -ENOMEM;
588
589 v4l2_fh_init(&handle->vfh, vdev);
590 v4l2_fh_add(&handle->vfh);
591
592 handle->device = &uvc->video;
593 file->private_data = &handle->vfh;
594
595 return 0;
596 }
597
598 static int
uvc_v4l2_release(struct file * file)599 uvc_v4l2_release(struct file *file)
600 {
601 struct video_device *vdev = video_devdata(file);
602 struct uvc_device *uvc = video_get_drvdata(vdev);
603 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
604 struct uvc_video *video = handle->device;
605
606 mutex_lock(&video->mutex);
607 if (handle->is_uvc_app_handle)
608 uvc_v4l2_disable(uvc);
609 mutex_unlock(&video->mutex);
610
611 file->private_data = NULL;
612 v4l2_fh_del(&handle->vfh);
613 v4l2_fh_exit(&handle->vfh);
614 kfree(handle);
615
616 return 0;
617 }
618
619 static int
uvc_v4l2_mmap(struct file * file,struct vm_area_struct * vma)620 uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
621 {
622 struct video_device *vdev = video_devdata(file);
623 struct uvc_device *uvc = video_get_drvdata(vdev);
624
625 return uvcg_queue_mmap(&uvc->video.queue, vma);
626 }
627
628 static __poll_t
uvc_v4l2_poll(struct file * file,poll_table * wait)629 uvc_v4l2_poll(struct file *file, poll_table *wait)
630 {
631 struct video_device *vdev = video_devdata(file);
632 struct uvc_device *uvc = video_get_drvdata(vdev);
633
634 return uvcg_queue_poll(&uvc->video.queue, file, wait);
635 }
636
637 #ifndef CONFIG_MMU
uvcg_v4l2_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)638 static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
639 unsigned long addr, unsigned long len, unsigned long pgoff,
640 unsigned long flags)
641 {
642 struct video_device *vdev = video_devdata(file);
643 struct uvc_device *uvc = video_get_drvdata(vdev);
644
645 return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
646 }
647 #endif
648
649 const struct v4l2_file_operations uvc_v4l2_fops = {
650 .owner = THIS_MODULE,
651 .open = uvc_v4l2_open,
652 .release = uvc_v4l2_release,
653 .unlocked_ioctl = video_ioctl2,
654 .mmap = uvc_v4l2_mmap,
655 .poll = uvc_v4l2_poll,
656 #ifndef CONFIG_MMU
657 .get_unmapped_area = uvcg_v4l2_get_unmapped_area,
658 #endif
659 };
660
661