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/videodev2.h>
15 #include <linux/vmalloc.h>
16 #include <linux/wait.h>
17 
18 #include <media/v4l2-dev.h>
19 #include <media/v4l2-event.h>
20 #include <media/v4l2-ioctl.h>
21 #include <media/v4l2-uvc.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 struct uvc_format_desc *to_uvc_format(struct uvcg_format *uformat)
31 {
32 	char guid[16] = UVC_GUID_FORMAT_MJPEG;
33 	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 		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 struct uvc_format {
203 	u8 bpp;
204 	u32 fcc;
205 };
206 
207 static struct uvc_format uvc_formats[] = {
208 	{ 16, V4L2_PIX_FMT_YUYV  },
209 	{ 0,  V4L2_PIX_FMT_MJPEG },
210 };
211 
212 static int
213 uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
214 {
215 	struct video_device *vdev = video_devdata(file);
216 	struct uvc_device *uvc = video_get_drvdata(vdev);
217 	struct usb_composite_dev *cdev = uvc->func.config->cdev;
218 
219 	strscpy(cap->driver, "g_uvc", sizeof(cap->driver));
220 	strscpy(cap->card, cdev->gadget->name, sizeof(cap->card));
221 	strscpy(cap->bus_info, dev_name(&cdev->gadget->dev),
222 		sizeof(cap->bus_info));
223 	return 0;
224 }
225 
226 static int
227 uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
228 {
229 	struct video_device *vdev = video_devdata(file);
230 	struct uvc_device *uvc = video_get_drvdata(vdev);
231 	struct uvc_video *video = &uvc->video;
232 
233 	fmt->fmt.pix.pixelformat = video->fcc;
234 	fmt->fmt.pix.width = video->width;
235 	fmt->fmt.pix.height = video->height;
236 	fmt->fmt.pix.field = V4L2_FIELD_NONE;
237 	fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
238 	fmt->fmt.pix.sizeimage = video->imagesize;
239 	fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
240 	fmt->fmt.pix.priv = 0;
241 
242 	return 0;
243 }
244 
245 static int
246 uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
247 {
248 	struct video_device *vdev = video_devdata(file);
249 	struct uvc_device *uvc = video_get_drvdata(vdev);
250 	struct uvc_video *video = &uvc->video;
251 	struct uvc_format *format;
252 	unsigned int imagesize;
253 	unsigned int bpl;
254 	unsigned int i;
255 
256 	for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) {
257 		format = &uvc_formats[i];
258 		if (format->fcc == fmt->fmt.pix.pixelformat)
259 			break;
260 	}
261 
262 	if (i == ARRAY_SIZE(uvc_formats)) {
263 		uvcg_info(&uvc->func, "Unsupported format 0x%08x.\n",
264 			  fmt->fmt.pix.pixelformat);
265 		return -EINVAL;
266 	}
267 
268 	bpl = format->bpp * fmt->fmt.pix.width / 8;
269 	imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage;
270 
271 	video->fcc = format->fcc;
272 	video->bpp = format->bpp;
273 	video->width = fmt->fmt.pix.width;
274 	video->height = fmt->fmt.pix.height;
275 	video->imagesize = imagesize;
276 
277 	fmt->fmt.pix.field = V4L2_FIELD_NONE;
278 	fmt->fmt.pix.bytesperline = bpl;
279 	fmt->fmt.pix.sizeimage = imagesize;
280 	fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
281 	fmt->fmt.pix.priv = 0;
282 
283 	return 0;
284 }
285 
286 static int
287 uvc_v4l2_try_format(struct file *file, void *fh, struct v4l2_format *fmt)
288 {
289 	struct video_device *vdev = video_devdata(file);
290 	struct uvc_device *uvc = video_get_drvdata(vdev);
291 	struct uvc_video *video = &uvc->video;
292 	struct uvcg_format *uformat;
293 	struct uvcg_frame *uframe;
294 	u8 *fcc;
295 
296 	if (fmt->type != video->queue.queue.type)
297 		return -EINVAL;
298 
299 	fcc = (u8 *)&fmt->fmt.pix.pixelformat;
300 	uvcg_dbg(&uvc->func, "Trying format 0x%08x (%c%c%c%c): %ux%u\n",
301 		fmt->fmt.pix.pixelformat,
302 		fcc[0], fcc[1], fcc[2], fcc[3],
303 		fmt->fmt.pix.width, fmt->fmt.pix.height);
304 
305 	uformat = find_format_by_pix(uvc, fmt->fmt.pix.pixelformat);
306 	if (!uformat)
307 		return -EINVAL;
308 
309 	uframe = find_closest_frame_by_size(uvc, uformat,
310 				fmt->fmt.pix.width, fmt->fmt.pix.height);
311 	if (!uframe)
312 		return -EINVAL;
313 
314 	fmt->fmt.pix.width = uframe->frame.w_width;
315 	fmt->fmt.pix.height = uframe->frame.w_height;
316 	fmt->fmt.pix.field = V4L2_FIELD_NONE;
317 	fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(uformat, uframe);
318 	fmt->fmt.pix.sizeimage = uvc_get_frame_size(uformat, uframe);
319 	fmt->fmt.pix.pixelformat = to_uvc_format(uformat)->fcc;
320 	fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
321 	fmt->fmt.pix.priv = 0;
322 
323 	return 0;
324 }
325 
326 static int
327 uvc_v4l2_enum_frameintervals(struct file *file, void *fh,
328 		struct v4l2_frmivalenum *fival)
329 {
330 	struct video_device *vdev = video_devdata(file);
331 	struct uvc_device *uvc = video_get_drvdata(vdev);
332 	struct uvcg_format *uformat = NULL;
333 	struct uvcg_frame *uframe = NULL;
334 	struct uvcg_frame_ptr *frame;
335 
336 	uformat = find_format_by_pix(uvc, fival->pixel_format);
337 	if (!uformat)
338 		return -EINVAL;
339 
340 	list_for_each_entry(frame, &uformat->frames, entry) {
341 		if (frame->frm->frame.w_width == fival->width &&
342 		    frame->frm->frame.w_height == fival->height) {
343 			uframe = frame->frm;
344 			break;
345 		}
346 	}
347 	if (!uframe)
348 		return -EINVAL;
349 
350 	if (fival->index >= uframe->frame.b_frame_interval_type)
351 		return -EINVAL;
352 
353 	fival->discrete.numerator =
354 		uframe->dw_frame_interval[fival->index];
355 
356 	/* TODO: handle V4L2_FRMIVAL_TYPE_STEPWISE */
357 	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
358 	fival->discrete.denominator = 10000000;
359 	v4l2_simplify_fraction(&fival->discrete.numerator,
360 		&fival->discrete.denominator, 8, 333);
361 
362 	return 0;
363 }
364 
365 static int
366 uvc_v4l2_enum_framesizes(struct file *file, void *fh,
367 		struct v4l2_frmsizeenum *fsize)
368 {
369 	struct video_device *vdev = video_devdata(file);
370 	struct uvc_device *uvc = video_get_drvdata(vdev);
371 	struct uvcg_format *uformat = NULL;
372 	struct uvcg_frame *uframe = NULL;
373 
374 	uformat = find_format_by_pix(uvc, fsize->pixel_format);
375 	if (!uformat)
376 		return -EINVAL;
377 
378 	if (fsize->index >= uformat->num_frames)
379 		return -EINVAL;
380 
381 	uframe = find_frame_by_index(uvc, uformat, fsize->index + 1);
382 	if (!uframe)
383 		return -EINVAL;
384 
385 	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
386 	fsize->discrete.width = uframe->frame.w_width;
387 	fsize->discrete.height = uframe->frame.w_height;
388 
389 	return 0;
390 }
391 
392 static int
393 uvc_v4l2_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
394 {
395 	struct video_device *vdev = video_devdata(file);
396 	struct uvc_device *uvc = video_get_drvdata(vdev);
397 	struct uvc_format_desc *fmtdesc;
398 	struct uvcg_format *uformat;
399 
400 	if (f->index >= uvc->header->num_fmt)
401 		return -EINVAL;
402 
403 	uformat = find_format_by_index(uvc, f->index + 1);
404 	if (!uformat)
405 		return -EINVAL;
406 
407 	if (uformat->type != UVCG_UNCOMPRESSED)
408 		f->flags |= V4L2_FMT_FLAG_COMPRESSED;
409 
410 	fmtdesc = to_uvc_format(uformat);
411 	f->pixelformat = fmtdesc->fcc;
412 
413 	strscpy(f->description, fmtdesc->name, sizeof(f->description));
414 	f->description[strlen(fmtdesc->name) - 1] = 0;
415 
416 	return 0;
417 }
418 
419 static int
420 uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
421 {
422 	struct video_device *vdev = video_devdata(file);
423 	struct uvc_device *uvc = video_get_drvdata(vdev);
424 	struct uvc_video *video = &uvc->video;
425 
426 	if (b->type != video->queue.queue.type)
427 		return -EINVAL;
428 
429 	return uvcg_alloc_buffers(&video->queue, b);
430 }
431 
432 static int
433 uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
434 {
435 	struct video_device *vdev = video_devdata(file);
436 	struct uvc_device *uvc = video_get_drvdata(vdev);
437 	struct uvc_video *video = &uvc->video;
438 
439 	return uvcg_query_buffer(&video->queue, b);
440 }
441 
442 static int
443 uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
444 {
445 	struct video_device *vdev = video_devdata(file);
446 	struct uvc_device *uvc = video_get_drvdata(vdev);
447 	struct uvc_video *video = &uvc->video;
448 	int ret;
449 
450 	ret = uvcg_queue_buffer(&video->queue, b);
451 	if (ret < 0)
452 		return ret;
453 
454 	if (uvc->state == UVC_STATE_STREAMING)
455 		queue_work(video->async_wq, &video->pump);
456 
457 	return ret;
458 }
459 
460 static int
461 uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
462 {
463 	struct video_device *vdev = video_devdata(file);
464 	struct uvc_device *uvc = video_get_drvdata(vdev);
465 	struct uvc_video *video = &uvc->video;
466 
467 	return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
468 }
469 
470 static int
471 uvc_v4l2_streamon(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 	int ret;
477 
478 	if (type != video->queue.queue.type)
479 		return -EINVAL;
480 
481 	/* Enable UVC video. */
482 	ret = uvcg_video_enable(video, 1);
483 	if (ret < 0)
484 		return ret;
485 
486 	/*
487 	 * Complete the alternate setting selection setup phase now that
488 	 * userspace is ready to provide video frames.
489 	 */
490 	uvc_function_setup_continue(uvc);
491 	uvc->state = UVC_STATE_STREAMING;
492 
493 	return 0;
494 }
495 
496 static int
497 uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
498 {
499 	struct video_device *vdev = video_devdata(file);
500 	struct uvc_device *uvc = video_get_drvdata(vdev);
501 	struct uvc_video *video = &uvc->video;
502 
503 	if (type != video->queue.queue.type)
504 		return -EINVAL;
505 
506 	return uvcg_video_enable(video, 0);
507 }
508 
509 static int
510 uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
511 			 const struct v4l2_event_subscription *sub)
512 {
513 	struct uvc_device *uvc = video_get_drvdata(fh->vdev);
514 	struct uvc_file_handle *handle = to_uvc_file_handle(fh);
515 	int ret;
516 
517 	if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
518 		return -EINVAL;
519 
520 	if (sub->type == UVC_EVENT_SETUP && uvc->func_connected)
521 		return -EBUSY;
522 
523 	ret = v4l2_event_subscribe(fh, sub, 2, NULL);
524 	if (ret < 0)
525 		return ret;
526 
527 	if (sub->type == UVC_EVENT_SETUP) {
528 		uvc->func_connected = true;
529 		handle->is_uvc_app_handle = true;
530 		uvc_function_connect(uvc);
531 	}
532 
533 	return 0;
534 }
535 
536 static void uvc_v4l2_disable(struct uvc_device *uvc)
537 {
538 	uvc_function_disconnect(uvc);
539 	uvcg_video_enable(&uvc->video, 0);
540 	uvcg_free_buffers(&uvc->video.queue);
541 	uvc->func_connected = false;
542 	wake_up_interruptible(&uvc->func_connected_queue);
543 }
544 
545 static int
546 uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
547 			   const struct v4l2_event_subscription *sub)
548 {
549 	struct uvc_device *uvc = video_get_drvdata(fh->vdev);
550 	struct uvc_file_handle *handle = to_uvc_file_handle(fh);
551 	int ret;
552 
553 	ret = v4l2_event_unsubscribe(fh, sub);
554 	if (ret < 0)
555 		return ret;
556 
557 	if (sub->type == UVC_EVENT_SETUP && handle->is_uvc_app_handle) {
558 		uvc_v4l2_disable(uvc);
559 		handle->is_uvc_app_handle = false;
560 	}
561 
562 	return 0;
563 }
564 
565 static long
566 uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
567 		       unsigned int cmd, void *arg)
568 {
569 	struct video_device *vdev = video_devdata(file);
570 	struct uvc_device *uvc = video_get_drvdata(vdev);
571 
572 	switch (cmd) {
573 	case UVCIOC_SEND_RESPONSE:
574 		return uvc_send_response(uvc, arg);
575 
576 	default:
577 		return -ENOIOCTLCMD;
578 	}
579 }
580 
581 const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
582 	.vidioc_querycap = uvc_v4l2_querycap,
583 	.vidioc_try_fmt_vid_out = uvc_v4l2_try_format,
584 	.vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
585 	.vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
586 	.vidioc_enum_frameintervals = uvc_v4l2_enum_frameintervals,
587 	.vidioc_enum_framesizes = uvc_v4l2_enum_framesizes,
588 	.vidioc_enum_fmt_vid_out = uvc_v4l2_enum_format,
589 	.vidioc_reqbufs = uvc_v4l2_reqbufs,
590 	.vidioc_querybuf = uvc_v4l2_querybuf,
591 	.vidioc_qbuf = uvc_v4l2_qbuf,
592 	.vidioc_dqbuf = uvc_v4l2_dqbuf,
593 	.vidioc_streamon = uvc_v4l2_streamon,
594 	.vidioc_streamoff = uvc_v4l2_streamoff,
595 	.vidioc_subscribe_event = uvc_v4l2_subscribe_event,
596 	.vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
597 	.vidioc_default = uvc_v4l2_ioctl_default,
598 };
599 
600 /* --------------------------------------------------------------------------
601  * V4L2
602  */
603 
604 static int
605 uvc_v4l2_open(struct file *file)
606 {
607 	struct video_device *vdev = video_devdata(file);
608 	struct uvc_device *uvc = video_get_drvdata(vdev);
609 	struct uvc_file_handle *handle;
610 
611 	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
612 	if (handle == NULL)
613 		return -ENOMEM;
614 
615 	v4l2_fh_init(&handle->vfh, vdev);
616 	v4l2_fh_add(&handle->vfh);
617 
618 	handle->device = &uvc->video;
619 	file->private_data = &handle->vfh;
620 
621 	return 0;
622 }
623 
624 static int
625 uvc_v4l2_release(struct file *file)
626 {
627 	struct video_device *vdev = video_devdata(file);
628 	struct uvc_device *uvc = video_get_drvdata(vdev);
629 	struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
630 	struct uvc_video *video = handle->device;
631 
632 	mutex_lock(&video->mutex);
633 	if (handle->is_uvc_app_handle)
634 		uvc_v4l2_disable(uvc);
635 	mutex_unlock(&video->mutex);
636 
637 	file->private_data = NULL;
638 	v4l2_fh_del(&handle->vfh);
639 	v4l2_fh_exit(&handle->vfh);
640 	kfree(handle);
641 
642 	return 0;
643 }
644 
645 static int
646 uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
647 {
648 	struct video_device *vdev = video_devdata(file);
649 	struct uvc_device *uvc = video_get_drvdata(vdev);
650 
651 	return uvcg_queue_mmap(&uvc->video.queue, vma);
652 }
653 
654 static __poll_t
655 uvc_v4l2_poll(struct file *file, poll_table *wait)
656 {
657 	struct video_device *vdev = video_devdata(file);
658 	struct uvc_device *uvc = video_get_drvdata(vdev);
659 
660 	return uvcg_queue_poll(&uvc->video.queue, file, wait);
661 }
662 
663 #ifndef CONFIG_MMU
664 static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
665 		unsigned long addr, unsigned long len, unsigned long pgoff,
666 		unsigned long flags)
667 {
668 	struct video_device *vdev = video_devdata(file);
669 	struct uvc_device *uvc = video_get_drvdata(vdev);
670 
671 	return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
672 }
673 #endif
674 
675 const struct v4l2_file_operations uvc_v4l2_fops = {
676 	.owner		= THIS_MODULE,
677 	.open		= uvc_v4l2_open,
678 	.release	= uvc_v4l2_release,
679 	.unlocked_ioctl	= video_ioctl2,
680 	.mmap		= uvc_v4l2_mmap,
681 	.poll		= uvc_v4l2_poll,
682 #ifndef CONFIG_MMU
683 	.get_unmapped_area = uvcg_v4l2_get_unmapped_area,
684 #endif
685 };
686 
687