xref: /linux/drivers/usb/gadget/function/uvc_v4l2.c (revision 24168c5e6dfbdd5b414f048f47f75d64533296ca) 
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 
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 
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 
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 
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 
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 
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 (fmtdesc->fcc == pixelformat) {
125 			uformat = format->fmt;
126 			break;
127 		}
128 	}
129 
130 	return uformat;
131 }
132 
133 static struct uvcg_frame *find_closest_frame_by_size(struct uvc_device *uvc,
134 					   struct uvcg_format *uformat,
135 					   u16 rw, u16 rh)
136 {
137 	struct uvc_video *video = &uvc->video;
138 	struct uvcg_format_ptr *format;
139 	struct uvcg_frame_ptr *frame;
140 	struct uvcg_frame *uframe = NULL;
141 	unsigned int d, maxd;
142 
143 	/* Find the closest image size. The distance between image sizes is
144 	 * the size in pixels of the non-overlapping regions between the
145 	 * requested size and the frame-specified size.
146 	 */
147 	maxd = (unsigned int)-1;
148 
149 	list_for_each_entry(format, &uvc->header->formats, entry) {
150 		if (format->fmt->type != uformat->type)
151 			continue;
152 
153 		list_for_each_entry(frame, &format->fmt->frames, entry) {
154 			u16 w, h;
155 
156 			w = frame->frm->frame.w_width;
157 			h = frame->frm->frame.w_height;
158 
159 			d = min(w, rw) * min(h, rh);
160 			d = w*h + rw*rh - 2*d;
161 			if (d < maxd) {
162 				maxd = d;
163 				uframe = frame->frm;
164 			}
165 
166 			if (maxd == 0)
167 				break;
168 		}
169 	}
170 
171 	if (!uframe)
172 		uvcg_dbg(&video->uvc->func, "Unsupported size %ux%u\n", rw, rh);
173 
174 	return uframe;
175 }
176 
177 /* --------------------------------------------------------------------------
178  * Requests handling
179  */
180 
181 static int
182 uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
183 {
184 	struct usb_composite_dev *cdev = uvc->func.config->cdev;
185 	struct usb_request *req = uvc->control_req;
186 
187 	if (data->length < 0)
188 		return usb_ep_set_halt(cdev->gadget->ep0);
189 
190 	req->length = min_t(unsigned int, uvc->event_length, data->length);
191 	req->zero = data->length < uvc->event_length;
192 
193 	memcpy(req->buf, data->data, req->length);
194 
195 	return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);
196 }
197 
198 /* --------------------------------------------------------------------------
199  * V4L2 ioctls
200  */
201 
202 static int
203 uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
204 {
205 	struct video_device *vdev = video_devdata(file);
206 	struct uvc_device *uvc = video_get_drvdata(vdev);
207 	struct usb_composite_dev *cdev = uvc->func.config->cdev;
208 
209 	strscpy(cap->driver, "g_uvc", sizeof(cap->driver));
210 	strscpy(cap->card, cdev->gadget->name, sizeof(cap->card));
211 	strscpy(cap->bus_info, dev_name(&cdev->gadget->dev),
212 		sizeof(cap->bus_info));
213 	return 0;
214 }
215 
216 static int
217 uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
218 {
219 	struct video_device *vdev = video_devdata(file);
220 	struct uvc_device *uvc = video_get_drvdata(vdev);
221 	struct uvc_video *video = &uvc->video;
222 
223 	fmt->fmt.pix.pixelformat = video->fcc;
224 	fmt->fmt.pix.width = video->width;
225 	fmt->fmt.pix.height = video->height;
226 	fmt->fmt.pix.field = V4L2_FIELD_NONE;
227 	fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
228 	fmt->fmt.pix.sizeimage = video->imagesize;
229 	fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
230 	fmt->fmt.pix.priv = 0;
231 
232 	return 0;
233 }
234 
235 static int
236 uvc_v4l2_try_format(struct file *file, void *fh, struct v4l2_format *fmt)
237 {
238 	struct video_device *vdev = video_devdata(file);
239 	struct uvc_device *uvc = video_get_drvdata(vdev);
240 	struct uvc_video *video = &uvc->video;
241 	struct uvcg_format *uformat;
242 	struct uvcg_frame *uframe;
243 	u8 *fcc;
244 
245 	if (fmt->type != video->queue.queue.type)
246 		return -EINVAL;
247 
248 	fcc = (u8 *)&fmt->fmt.pix.pixelformat;
249 	uvcg_dbg(&uvc->func, "Trying format 0x%08x (%c%c%c%c): %ux%u\n",
250 		fmt->fmt.pix.pixelformat,
251 		fcc[0], fcc[1], fcc[2], fcc[3],
252 		fmt->fmt.pix.width, fmt->fmt.pix.height);
253 
254 	uformat = find_format_by_pix(uvc, fmt->fmt.pix.pixelformat);
255 	if (!uformat)
256 		return -EINVAL;
257 
258 	uframe = find_closest_frame_by_size(uvc, uformat,
259 				fmt->fmt.pix.width, fmt->fmt.pix.height);
260 	if (!uframe)
261 		return -EINVAL;
262 
263 	if (uformat->type == UVCG_UNCOMPRESSED) {
264 		struct uvcg_uncompressed *u =
265 			to_uvcg_uncompressed(&uformat->group.cg_item);
266 		if (!u)
267 			return 0;
268 
269 		v4l2_fill_pixfmt(&fmt->fmt.pix, fmt->fmt.pix.pixelformat,
270 				 uframe->frame.w_width, uframe->frame.w_height);
271 
272 		if (fmt->fmt.pix.sizeimage != (uvc_v4l2_get_bytesperline(uformat, uframe) *
273 						uframe->frame.w_height))
274 			return -EINVAL;
275 	} else {
276 		fmt->fmt.pix.width = uframe->frame.w_width;
277 		fmt->fmt.pix.height = uframe->frame.w_height;
278 		fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(uformat, uframe);
279 		fmt->fmt.pix.sizeimage = uvc_get_frame_size(uformat, uframe);
280 		fmt->fmt.pix.pixelformat = to_uvc_format(uformat)->fcc;
281 	}
282 	fmt->fmt.pix.field = V4L2_FIELD_NONE;
283 	fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
284 	fmt->fmt.pix.priv = 0;
285 
286 	return 0;
287 }
288 
289 static int
290 uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
291 {
292 	struct video_device *vdev = video_devdata(file);
293 	struct uvc_device *uvc = video_get_drvdata(vdev);
294 	struct uvc_video *video = &uvc->video;
295 	int ret;
296 
297 	ret = uvc_v4l2_try_format(file, fh, fmt);
298 	if (ret)
299 		return ret;
300 
301 	video->fcc = fmt->fmt.pix.pixelformat;
302 	video->bpp = fmt->fmt.pix.bytesperline * 8 / video->width;
303 	video->width = fmt->fmt.pix.width;
304 	video->height = fmt->fmt.pix.height;
305 	video->imagesize = fmt->fmt.pix.sizeimage;
306 
307 	return ret;
308 }
309 
310 static int
311 uvc_v4l2_enum_frameintervals(struct file *file, void *fh,
312 		struct v4l2_frmivalenum *fival)
313 {
314 	struct video_device *vdev = video_devdata(file);
315 	struct uvc_device *uvc = video_get_drvdata(vdev);
316 	struct uvcg_format *uformat = NULL;
317 	struct uvcg_frame *uframe = NULL;
318 	struct uvcg_frame_ptr *frame;
319 
320 	uformat = find_format_by_pix(uvc, fival->pixel_format);
321 	if (!uformat)
322 		return -EINVAL;
323 
324 	list_for_each_entry(frame, &uformat->frames, entry) {
325 		if (frame->frm->frame.w_width == fival->width &&
326 		    frame->frm->frame.w_height == fival->height) {
327 			uframe = frame->frm;
328 			break;
329 		}
330 	}
331 	if (!uframe)
332 		return -EINVAL;
333 
334 	if (fival->index >= uframe->frame.b_frame_interval_type)
335 		return -EINVAL;
336 
337 	fival->discrete.numerator =
338 		uframe->dw_frame_interval[fival->index];
339 
340 	/* TODO: handle V4L2_FRMIVAL_TYPE_STEPWISE */
341 	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
342 	fival->discrete.denominator = 10000000;
343 	v4l2_simplify_fraction(&fival->discrete.numerator,
344 		&fival->discrete.denominator, 8, 333);
345 
346 	return 0;
347 }
348 
349 static int
350 uvc_v4l2_enum_framesizes(struct file *file, void *fh,
351 		struct v4l2_frmsizeenum *fsize)
352 {
353 	struct video_device *vdev = video_devdata(file);
354 	struct uvc_device *uvc = video_get_drvdata(vdev);
355 	struct uvcg_format *uformat = NULL;
356 	struct uvcg_frame *uframe = NULL;
357 
358 	uformat = find_format_by_pix(uvc, fsize->pixel_format);
359 	if (!uformat)
360 		return -EINVAL;
361 
362 	if (fsize->index >= uformat->num_frames)
363 		return -EINVAL;
364 
365 	uframe = find_frame_by_index(uvc, uformat, fsize->index + 1);
366 	if (!uframe)
367 		return -EINVAL;
368 
369 	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
370 	fsize->discrete.width = uframe->frame.w_width;
371 	fsize->discrete.height = uframe->frame.w_height;
372 
373 	return 0;
374 }
375 
376 static int
377 uvc_v4l2_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
378 {
379 	struct video_device *vdev = video_devdata(file);
380 	struct uvc_device *uvc = video_get_drvdata(vdev);
381 	const struct uvc_format_desc *fmtdesc;
382 	struct uvcg_format *uformat;
383 
384 	if (f->index >= uvc->header->num_fmt)
385 		return -EINVAL;
386 
387 	uformat = find_format_by_index(uvc, f->index + 1);
388 	if (!uformat)
389 		return -EINVAL;
390 
391 	fmtdesc = to_uvc_format(uformat);
392 	f->pixelformat = fmtdesc->fcc;
393 
394 	return 0;
395 }
396 
397 static int
398 uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
399 {
400 	struct video_device *vdev = video_devdata(file);
401 	struct uvc_device *uvc = video_get_drvdata(vdev);
402 	struct uvc_video *video = &uvc->video;
403 
404 	if (b->type != video->queue.queue.type)
405 		return -EINVAL;
406 
407 	return uvcg_alloc_buffers(&video->queue, b);
408 }
409 
410 static int
411 uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
412 {
413 	struct video_device *vdev = video_devdata(file);
414 	struct uvc_device *uvc = video_get_drvdata(vdev);
415 	struct uvc_video *video = &uvc->video;
416 
417 	return uvcg_query_buffer(&video->queue, b);
418 }
419 
420 static int
421 uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
422 {
423 	struct video_device *vdev = video_devdata(file);
424 	struct uvc_device *uvc = video_get_drvdata(vdev);
425 	struct uvc_video *video = &uvc->video;
426 	int ret;
427 
428 	ret = uvcg_queue_buffer(&video->queue, b);
429 	if (ret < 0)
430 		return ret;
431 
432 	if (uvc->state == UVC_STATE_STREAMING)
433 		queue_work(video->async_wq, &video->pump);
434 
435 	return ret;
436 }
437 
438 static int
439 uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
440 {
441 	struct video_device *vdev = video_devdata(file);
442 	struct uvc_device *uvc = video_get_drvdata(vdev);
443 	struct uvc_video *video = &uvc->video;
444 
445 	return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
446 }
447 
448 static int
449 uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
450 {
451 	struct video_device *vdev = video_devdata(file);
452 	struct uvc_device *uvc = video_get_drvdata(vdev);
453 	struct uvc_video *video = &uvc->video;
454 	int ret;
455 
456 	if (type != video->queue.queue.type)
457 		return -EINVAL;
458 
459 	/* Enable UVC video. */
460 	ret = uvcg_video_enable(video);
461 	if (ret < 0)
462 		return ret;
463 
464 	/*
465 	 * Complete the alternate setting selection setup phase now that
466 	 * userspace is ready to provide video frames.
467 	 */
468 	uvc_function_setup_continue(uvc, 0);
469 	uvc->state = UVC_STATE_STREAMING;
470 
471 	return 0;
472 }
473 
474 static int
475 uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
476 {
477 	struct video_device *vdev = video_devdata(file);
478 	struct uvc_device *uvc = video_get_drvdata(vdev);
479 	struct uvc_video *video = &uvc->video;
480 	int ret = 0;
481 
482 	if (type != video->queue.queue.type)
483 		return -EINVAL;
484 
485 	ret = uvcg_video_disable(video);
486 	if (ret < 0)
487 		return ret;
488 
489 	uvc->state = UVC_STATE_CONNECTED;
490 	uvc_function_setup_continue(uvc, 1);
491 	return 0;
492 }
493 
494 static int
495 uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
496 			 const struct v4l2_event_subscription *sub)
497 {
498 	struct uvc_device *uvc = video_get_drvdata(fh->vdev);
499 	struct uvc_file_handle *handle = to_uvc_file_handle(fh);
500 	int ret;
501 
502 	if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
503 		return -EINVAL;
504 
505 	if (sub->type == UVC_EVENT_SETUP && uvc->func_connected)
506 		return -EBUSY;
507 
508 	ret = v4l2_event_subscribe(fh, sub, 2, NULL);
509 	if (ret < 0)
510 		return ret;
511 
512 	if (sub->type == UVC_EVENT_SETUP) {
513 		uvc->func_connected = true;
514 		handle->is_uvc_app_handle = true;
515 		uvc_function_connect(uvc);
516 	}
517 
518 	return 0;
519 }
520 
521 static void uvc_v4l2_disable(struct uvc_device *uvc)
522 {
523 	uvc_function_disconnect(uvc);
524 	uvcg_video_disable(&uvc->video);
525 	uvcg_free_buffers(&uvc->video.queue);
526 	uvc->func_connected = false;
527 	wake_up_interruptible(&uvc->func_connected_queue);
528 }
529 
530 static int
531 uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
532 			   const struct v4l2_event_subscription *sub)
533 {
534 	struct uvc_device *uvc = video_get_drvdata(fh->vdev);
535 	struct uvc_file_handle *handle = to_uvc_file_handle(fh);
536 	int ret;
537 
538 	ret = v4l2_event_unsubscribe(fh, sub);
539 	if (ret < 0)
540 		return ret;
541 
542 	if (sub->type == UVC_EVENT_SETUP && handle->is_uvc_app_handle) {
543 		uvc_v4l2_disable(uvc);
544 		handle->is_uvc_app_handle = false;
545 	}
546 
547 	return 0;
548 }
549 
550 static long
551 uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
552 		       unsigned int cmd, void *arg)
553 {
554 	struct video_device *vdev = video_devdata(file);
555 	struct uvc_device *uvc = video_get_drvdata(vdev);
556 
557 	switch (cmd) {
558 	case UVCIOC_SEND_RESPONSE:
559 		return uvc_send_response(uvc, arg);
560 
561 	default:
562 		return -ENOIOCTLCMD;
563 	}
564 }
565 
566 const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
567 	.vidioc_querycap = uvc_v4l2_querycap,
568 	.vidioc_try_fmt_vid_out = uvc_v4l2_try_format,
569 	.vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
570 	.vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
571 	.vidioc_enum_frameintervals = uvc_v4l2_enum_frameintervals,
572 	.vidioc_enum_framesizes = uvc_v4l2_enum_framesizes,
573 	.vidioc_enum_fmt_vid_out = uvc_v4l2_enum_format,
574 	.vidioc_reqbufs = uvc_v4l2_reqbufs,
575 	.vidioc_querybuf = uvc_v4l2_querybuf,
576 	.vidioc_qbuf = uvc_v4l2_qbuf,
577 	.vidioc_dqbuf = uvc_v4l2_dqbuf,
578 	.vidioc_streamon = uvc_v4l2_streamon,
579 	.vidioc_streamoff = uvc_v4l2_streamoff,
580 	.vidioc_subscribe_event = uvc_v4l2_subscribe_event,
581 	.vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
582 	.vidioc_default = uvc_v4l2_ioctl_default,
583 };
584 
585 /* --------------------------------------------------------------------------
586  * V4L2
587  */
588 
589 static int
590 uvc_v4l2_open(struct file *file)
591 {
592 	struct video_device *vdev = video_devdata(file);
593 	struct uvc_device *uvc = video_get_drvdata(vdev);
594 	struct uvc_file_handle *handle;
595 
596 	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
597 	if (handle == NULL)
598 		return -ENOMEM;
599 
600 	v4l2_fh_init(&handle->vfh, vdev);
601 	v4l2_fh_add(&handle->vfh);
602 
603 	handle->device = &uvc->video;
604 	file->private_data = &handle->vfh;
605 
606 	return 0;
607 }
608 
609 static int
610 uvc_v4l2_release(struct file *file)
611 {
612 	struct video_device *vdev = video_devdata(file);
613 	struct uvc_device *uvc = video_get_drvdata(vdev);
614 	struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
615 	struct uvc_video *video = handle->device;
616 
617 	mutex_lock(&video->mutex);
618 	if (handle->is_uvc_app_handle)
619 		uvc_v4l2_disable(uvc);
620 	mutex_unlock(&video->mutex);
621 
622 	file->private_data = NULL;
623 	v4l2_fh_del(&handle->vfh);
624 	v4l2_fh_exit(&handle->vfh);
625 	kfree(handle);
626 
627 	return 0;
628 }
629 
630 static int
631 uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
632 {
633 	struct video_device *vdev = video_devdata(file);
634 	struct uvc_device *uvc = video_get_drvdata(vdev);
635 
636 	return uvcg_queue_mmap(&uvc->video.queue, vma);
637 }
638 
639 static __poll_t
640 uvc_v4l2_poll(struct file *file, poll_table *wait)
641 {
642 	struct video_device *vdev = video_devdata(file);
643 	struct uvc_device *uvc = video_get_drvdata(vdev);
644 
645 	return uvcg_queue_poll(&uvc->video.queue, file, wait);
646 }
647 
648 #ifndef CONFIG_MMU
649 static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
650 		unsigned long addr, unsigned long len, unsigned long pgoff,
651 		unsigned long flags)
652 {
653 	struct video_device *vdev = video_devdata(file);
654 	struct uvc_device *uvc = video_get_drvdata(vdev);
655 
656 	return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
657 }
658 #endif
659 
660 const struct v4l2_file_operations uvc_v4l2_fops = {
661 	.owner		= THIS_MODULE,
662 	.open		= uvc_v4l2_open,
663 	.release	= uvc_v4l2_release,
664 	.unlocked_ioctl	= video_ioctl2,
665 	.mmap		= uvc_v4l2_mmap,
666 	.poll		= uvc_v4l2_poll,
667 #ifndef CONFIG_MMU
668 	.get_unmapped_area = uvcg_v4l2_get_unmapped_area,
669 #endif
670 };
671