xref: /openbmc/linux/drivers/media/usb/uvc/uvc_v4l2.c (revision 4f205687)
1 /*
2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
3  *
4  *      Copyright (C) 2005-2010
5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
6  *
7  *      This program is free software; you can redistribute it and/or modify
8  *      it under the terms of the GNU General Public License as published by
9  *      the Free Software Foundation; either version 2 of the License, or
10  *      (at your option) any later version.
11  *
12  */
13 
14 #include <linux/compat.h>
15 #include <linux/kernel.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/usb.h>
20 #include <linux/videodev2.h>
21 #include <linux/vmalloc.h>
22 #include <linux/mm.h>
23 #include <linux/wait.h>
24 #include <linux/atomic.h>
25 
26 #include <media/v4l2-common.h>
27 #include <media/v4l2-ctrls.h>
28 #include <media/v4l2-event.h>
29 #include <media/v4l2-ioctl.h>
30 
31 #include "uvcvideo.h"
32 
33 /* ------------------------------------------------------------------------
34  * UVC ioctls
35  */
36 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
37 	struct uvc_xu_control_mapping *xmap)
38 {
39 	struct uvc_control_mapping *map;
40 	unsigned int size;
41 	int ret;
42 
43 	map = kzalloc(sizeof *map, GFP_KERNEL);
44 	if (map == NULL)
45 		return -ENOMEM;
46 
47 	map->id = xmap->id;
48 	memcpy(map->name, xmap->name, sizeof map->name);
49 	memcpy(map->entity, xmap->entity, sizeof map->entity);
50 	map->selector = xmap->selector;
51 	map->size = xmap->size;
52 	map->offset = xmap->offset;
53 	map->v4l2_type = xmap->v4l2_type;
54 	map->data_type = xmap->data_type;
55 
56 	switch (xmap->v4l2_type) {
57 	case V4L2_CTRL_TYPE_INTEGER:
58 	case V4L2_CTRL_TYPE_BOOLEAN:
59 	case V4L2_CTRL_TYPE_BUTTON:
60 		break;
61 
62 	case V4L2_CTRL_TYPE_MENU:
63 		/* Prevent excessive memory consumption, as well as integer
64 		 * overflows.
65 		 */
66 		if (xmap->menu_count == 0 ||
67 		    xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
68 			ret = -EINVAL;
69 			goto done;
70 		}
71 
72 		size = xmap->menu_count * sizeof(*map->menu_info);
73 		map->menu_info = kmalloc(size, GFP_KERNEL);
74 		if (map->menu_info == NULL) {
75 			ret = -ENOMEM;
76 			goto done;
77 		}
78 
79 		if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
80 			ret = -EFAULT;
81 			goto done;
82 		}
83 
84 		map->menu_count = xmap->menu_count;
85 		break;
86 
87 	default:
88 		uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
89 			  "%u.\n", xmap->v4l2_type);
90 		ret = -ENOTTY;
91 		goto done;
92 	}
93 
94 	ret = uvc_ctrl_add_mapping(chain, map);
95 
96 done:
97 	kfree(map->menu_info);
98 	kfree(map);
99 
100 	return ret;
101 }
102 
103 /* ------------------------------------------------------------------------
104  * V4L2 interface
105  */
106 
107 /*
108  * Find the frame interval closest to the requested frame interval for the
109  * given frame format and size. This should be done by the device as part of
110  * the Video Probe and Commit negotiation, but some hardware don't implement
111  * that feature.
112  */
113 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
114 {
115 	unsigned int i;
116 
117 	if (frame->bFrameIntervalType) {
118 		__u32 best = -1, dist;
119 
120 		for (i = 0; i < frame->bFrameIntervalType; ++i) {
121 			dist = interval > frame->dwFrameInterval[i]
122 			     ? interval - frame->dwFrameInterval[i]
123 			     : frame->dwFrameInterval[i] - interval;
124 
125 			if (dist > best)
126 				break;
127 
128 			best = dist;
129 		}
130 
131 		interval = frame->dwFrameInterval[i-1];
132 	} else {
133 		const __u32 min = frame->dwFrameInterval[0];
134 		const __u32 max = frame->dwFrameInterval[1];
135 		const __u32 step = frame->dwFrameInterval[2];
136 
137 		interval = min + (interval - min + step/2) / step * step;
138 		if (interval > max)
139 			interval = max;
140 	}
141 
142 	return interval;
143 }
144 
145 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
146 	struct v4l2_format *fmt, struct uvc_streaming_control *probe,
147 	struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
148 {
149 	struct uvc_format *format = NULL;
150 	struct uvc_frame *frame = NULL;
151 	__u16 rw, rh;
152 	unsigned int d, maxd;
153 	unsigned int i;
154 	__u32 interval;
155 	int ret = 0;
156 	__u8 *fcc;
157 
158 	if (fmt->type != stream->type)
159 		return -EINVAL;
160 
161 	fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
162 	uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
163 			fmt->fmt.pix.pixelformat,
164 			fcc[0], fcc[1], fcc[2], fcc[3],
165 			fmt->fmt.pix.width, fmt->fmt.pix.height);
166 
167 	/* Check if the hardware supports the requested format, use the default
168 	 * format otherwise.
169 	 */
170 	for (i = 0; i < stream->nformats; ++i) {
171 		format = &stream->format[i];
172 		if (format->fcc == fmt->fmt.pix.pixelformat)
173 			break;
174 	}
175 
176 	if (i == stream->nformats) {
177 		format = stream->def_format;
178 		fmt->fmt.pix.pixelformat = format->fcc;
179 	}
180 
181 	/* Find the closest image size. The distance between image sizes is
182 	 * the size in pixels of the non-overlapping regions between the
183 	 * requested size and the frame-specified size.
184 	 */
185 	rw = fmt->fmt.pix.width;
186 	rh = fmt->fmt.pix.height;
187 	maxd = (unsigned int)-1;
188 
189 	for (i = 0; i < format->nframes; ++i) {
190 		__u16 w = format->frame[i].wWidth;
191 		__u16 h = format->frame[i].wHeight;
192 
193 		d = min(w, rw) * min(h, rh);
194 		d = w*h + rw*rh - 2*d;
195 		if (d < maxd) {
196 			maxd = d;
197 			frame = &format->frame[i];
198 		}
199 
200 		if (maxd == 0)
201 			break;
202 	}
203 
204 	if (frame == NULL) {
205 		uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
206 				fmt->fmt.pix.width, fmt->fmt.pix.height);
207 		return -EINVAL;
208 	}
209 
210 	/* Use the default frame interval. */
211 	interval = frame->dwDefaultFrameInterval;
212 	uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
213 		"(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
214 		(100000000/interval)%10);
215 
216 	/* Set the format index, frame index and frame interval. */
217 	memset(probe, 0, sizeof *probe);
218 	probe->bmHint = 1;	/* dwFrameInterval */
219 	probe->bFormatIndex = format->index;
220 	probe->bFrameIndex = frame->bFrameIndex;
221 	probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
222 	/* Some webcams stall the probe control set request when the
223 	 * dwMaxVideoFrameSize field is set to zero. The UVC specification
224 	 * clearly states that the field is read-only from the host, so this
225 	 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
226 	 * the webcam to work around the problem.
227 	 *
228 	 * The workaround could probably be enabled for all webcams, so the
229 	 * quirk can be removed if needed. It's currently useful to detect
230 	 * webcam bugs and fix them before they hit the market (providing
231 	 * developers test their webcams with the Linux driver as well as with
232 	 * the Windows driver).
233 	 */
234 	mutex_lock(&stream->mutex);
235 	if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
236 		probe->dwMaxVideoFrameSize =
237 			stream->ctrl.dwMaxVideoFrameSize;
238 
239 	/* Probe the device. */
240 	ret = uvc_probe_video(stream, probe);
241 	mutex_unlock(&stream->mutex);
242 	if (ret < 0)
243 		goto done;
244 
245 	fmt->fmt.pix.width = frame->wWidth;
246 	fmt->fmt.pix.height = frame->wHeight;
247 	fmt->fmt.pix.field = V4L2_FIELD_NONE;
248 	fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
249 	fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
250 	fmt->fmt.pix.colorspace = format->colorspace;
251 	fmt->fmt.pix.priv = 0;
252 
253 	if (uvc_format != NULL)
254 		*uvc_format = format;
255 	if (uvc_frame != NULL)
256 		*uvc_frame = frame;
257 
258 done:
259 	return ret;
260 }
261 
262 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
263 	struct v4l2_format *fmt)
264 {
265 	struct uvc_format *format;
266 	struct uvc_frame *frame;
267 	int ret = 0;
268 
269 	if (fmt->type != stream->type)
270 		return -EINVAL;
271 
272 	mutex_lock(&stream->mutex);
273 	format = stream->cur_format;
274 	frame = stream->cur_frame;
275 
276 	if (format == NULL || frame == NULL) {
277 		ret = -EINVAL;
278 		goto done;
279 	}
280 
281 	fmt->fmt.pix.pixelformat = format->fcc;
282 	fmt->fmt.pix.width = frame->wWidth;
283 	fmt->fmt.pix.height = frame->wHeight;
284 	fmt->fmt.pix.field = V4L2_FIELD_NONE;
285 	fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
286 	fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
287 	fmt->fmt.pix.colorspace = format->colorspace;
288 	fmt->fmt.pix.priv = 0;
289 
290 done:
291 	mutex_unlock(&stream->mutex);
292 	return ret;
293 }
294 
295 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
296 	struct v4l2_format *fmt)
297 {
298 	struct uvc_streaming_control probe;
299 	struct uvc_format *format;
300 	struct uvc_frame *frame;
301 	int ret;
302 
303 	if (fmt->type != stream->type)
304 		return -EINVAL;
305 
306 	ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
307 	if (ret < 0)
308 		return ret;
309 
310 	mutex_lock(&stream->mutex);
311 
312 	if (uvc_queue_allocated(&stream->queue)) {
313 		ret = -EBUSY;
314 		goto done;
315 	}
316 
317 	stream->ctrl = probe;
318 	stream->cur_format = format;
319 	stream->cur_frame = frame;
320 
321 done:
322 	mutex_unlock(&stream->mutex);
323 	return ret;
324 }
325 
326 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
327 		struct v4l2_streamparm *parm)
328 {
329 	uint32_t numerator, denominator;
330 
331 	if (parm->type != stream->type)
332 		return -EINVAL;
333 
334 	mutex_lock(&stream->mutex);
335 	numerator = stream->ctrl.dwFrameInterval;
336 	mutex_unlock(&stream->mutex);
337 
338 	denominator = 10000000;
339 	uvc_simplify_fraction(&numerator, &denominator, 8, 333);
340 
341 	memset(parm, 0, sizeof *parm);
342 	parm->type = stream->type;
343 
344 	if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
345 		parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
346 		parm->parm.capture.capturemode = 0;
347 		parm->parm.capture.timeperframe.numerator = numerator;
348 		parm->parm.capture.timeperframe.denominator = denominator;
349 		parm->parm.capture.extendedmode = 0;
350 		parm->parm.capture.readbuffers = 0;
351 	} else {
352 		parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
353 		parm->parm.output.outputmode = 0;
354 		parm->parm.output.timeperframe.numerator = numerator;
355 		parm->parm.output.timeperframe.denominator = denominator;
356 	}
357 
358 	return 0;
359 }
360 
361 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
362 		struct v4l2_streamparm *parm)
363 {
364 	struct uvc_streaming_control probe;
365 	struct v4l2_fract timeperframe;
366 	uint32_t interval;
367 	int ret;
368 
369 	if (parm->type != stream->type)
370 		return -EINVAL;
371 
372 	if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
373 		timeperframe = parm->parm.capture.timeperframe;
374 	else
375 		timeperframe = parm->parm.output.timeperframe;
376 
377 	interval = uvc_fraction_to_interval(timeperframe.numerator,
378 		timeperframe.denominator);
379 	uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
380 		timeperframe.numerator, timeperframe.denominator, interval);
381 
382 	mutex_lock(&stream->mutex);
383 
384 	if (uvc_queue_streaming(&stream->queue)) {
385 		mutex_unlock(&stream->mutex);
386 		return -EBUSY;
387 	}
388 
389 	probe = stream->ctrl;
390 	probe.dwFrameInterval =
391 		uvc_try_frame_interval(stream->cur_frame, interval);
392 
393 	/* Probe the device with the new settings. */
394 	ret = uvc_probe_video(stream, &probe);
395 	if (ret < 0) {
396 		mutex_unlock(&stream->mutex);
397 		return ret;
398 	}
399 
400 	stream->ctrl = probe;
401 	mutex_unlock(&stream->mutex);
402 
403 	/* Return the actual frame period. */
404 	timeperframe.numerator = probe.dwFrameInterval;
405 	timeperframe.denominator = 10000000;
406 	uvc_simplify_fraction(&timeperframe.numerator,
407 		&timeperframe.denominator, 8, 333);
408 
409 	if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
410 		parm->parm.capture.timeperframe = timeperframe;
411 	else
412 		parm->parm.output.timeperframe = timeperframe;
413 
414 	return 0;
415 }
416 
417 /* ------------------------------------------------------------------------
418  * Privilege management
419  */
420 
421 /*
422  * Privilege management is the multiple-open implementation basis. The current
423  * implementation is completely transparent for the end-user and doesn't
424  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
425  * Those ioctls enable finer control on the device (by making possible for a
426  * user to request exclusive access to a device), but are not mature yet.
427  * Switching to the V4L2 priority mechanism might be considered in the future
428  * if this situation changes.
429  *
430  * Each open instance of a UVC device can either be in a privileged or
431  * unprivileged state. Only a single instance can be in a privileged state at
432  * a given time. Trying to perform an operation that requires privileges will
433  * automatically acquire the required privileges if possible, or return -EBUSY
434  * otherwise. Privileges are dismissed when closing the instance or when
435  * freeing the video buffers using VIDIOC_REQBUFS.
436  *
437  * Operations that require privileges are:
438  *
439  * - VIDIOC_S_INPUT
440  * - VIDIOC_S_PARM
441  * - VIDIOC_S_FMT
442  * - VIDIOC_REQBUFS
443  */
444 static int uvc_acquire_privileges(struct uvc_fh *handle)
445 {
446 	/* Always succeed if the handle is already privileged. */
447 	if (handle->state == UVC_HANDLE_ACTIVE)
448 		return 0;
449 
450 	/* Check if the device already has a privileged handle. */
451 	if (atomic_inc_return(&handle->stream->active) != 1) {
452 		atomic_dec(&handle->stream->active);
453 		return -EBUSY;
454 	}
455 
456 	handle->state = UVC_HANDLE_ACTIVE;
457 	return 0;
458 }
459 
460 static void uvc_dismiss_privileges(struct uvc_fh *handle)
461 {
462 	if (handle->state == UVC_HANDLE_ACTIVE)
463 		atomic_dec(&handle->stream->active);
464 
465 	handle->state = UVC_HANDLE_PASSIVE;
466 }
467 
468 static int uvc_has_privileges(struct uvc_fh *handle)
469 {
470 	return handle->state == UVC_HANDLE_ACTIVE;
471 }
472 
473 /* ------------------------------------------------------------------------
474  * V4L2 file operations
475  */
476 
477 static int uvc_v4l2_open(struct file *file)
478 {
479 	struct uvc_streaming *stream;
480 	struct uvc_fh *handle;
481 	int ret = 0;
482 
483 	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
484 	stream = video_drvdata(file);
485 
486 	ret = usb_autopm_get_interface(stream->dev->intf);
487 	if (ret < 0)
488 		return ret;
489 
490 	/* Create the device handle. */
491 	handle = kzalloc(sizeof *handle, GFP_KERNEL);
492 	if (handle == NULL) {
493 		usb_autopm_put_interface(stream->dev->intf);
494 		return -ENOMEM;
495 	}
496 
497 	mutex_lock(&stream->dev->lock);
498 	if (stream->dev->users == 0) {
499 		ret = uvc_status_start(stream->dev, GFP_KERNEL);
500 		if (ret < 0) {
501 			mutex_unlock(&stream->dev->lock);
502 			usb_autopm_put_interface(stream->dev->intf);
503 			kfree(handle);
504 			return ret;
505 		}
506 	}
507 
508 	stream->dev->users++;
509 	mutex_unlock(&stream->dev->lock);
510 
511 	v4l2_fh_init(&handle->vfh, &stream->vdev);
512 	v4l2_fh_add(&handle->vfh);
513 	handle->chain = stream->chain;
514 	handle->stream = stream;
515 	handle->state = UVC_HANDLE_PASSIVE;
516 	file->private_data = handle;
517 
518 	return 0;
519 }
520 
521 static int uvc_v4l2_release(struct file *file)
522 {
523 	struct uvc_fh *handle = file->private_data;
524 	struct uvc_streaming *stream = handle->stream;
525 
526 	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
527 
528 	/* Only free resources if this is a privileged handle. */
529 	if (uvc_has_privileges(handle))
530 		uvc_queue_release(&stream->queue);
531 
532 	/* Release the file handle. */
533 	uvc_dismiss_privileges(handle);
534 	v4l2_fh_del(&handle->vfh);
535 	v4l2_fh_exit(&handle->vfh);
536 	kfree(handle);
537 	file->private_data = NULL;
538 
539 	mutex_lock(&stream->dev->lock);
540 	if (--stream->dev->users == 0)
541 		uvc_status_stop(stream->dev);
542 	mutex_unlock(&stream->dev->lock);
543 
544 	usb_autopm_put_interface(stream->dev->intf);
545 	return 0;
546 }
547 
548 static int uvc_ioctl_querycap(struct file *file, void *fh,
549 			      struct v4l2_capability *cap)
550 {
551 	struct video_device *vdev = video_devdata(file);
552 	struct uvc_fh *handle = file->private_data;
553 	struct uvc_video_chain *chain = handle->chain;
554 	struct uvc_streaming *stream = handle->stream;
555 
556 	strlcpy(cap->driver, "uvcvideo", sizeof(cap->driver));
557 	strlcpy(cap->card, vdev->name, sizeof(cap->card));
558 	usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
559 	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
560 			  | chain->caps;
561 	if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
562 		cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
563 	else
564 		cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
565 
566 	return 0;
567 }
568 
569 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
570 			      struct v4l2_fmtdesc *fmt)
571 {
572 	struct uvc_format *format;
573 	enum v4l2_buf_type type = fmt->type;
574 	__u32 index = fmt->index;
575 
576 	if (fmt->type != stream->type || fmt->index >= stream->nformats)
577 		return -EINVAL;
578 
579 	memset(fmt, 0, sizeof(*fmt));
580 	fmt->index = index;
581 	fmt->type = type;
582 
583 	format = &stream->format[fmt->index];
584 	fmt->flags = 0;
585 	if (format->flags & UVC_FMT_FLAG_COMPRESSED)
586 		fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
587 	strlcpy(fmt->description, format->name, sizeof(fmt->description));
588 	fmt->description[sizeof(fmt->description) - 1] = 0;
589 	fmt->pixelformat = format->fcc;
590 	return 0;
591 }
592 
593 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
594 				      struct v4l2_fmtdesc *fmt)
595 {
596 	struct uvc_fh *handle = fh;
597 	struct uvc_streaming *stream = handle->stream;
598 
599 	return uvc_ioctl_enum_fmt(stream, fmt);
600 }
601 
602 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
603 				      struct v4l2_fmtdesc *fmt)
604 {
605 	struct uvc_fh *handle = fh;
606 	struct uvc_streaming *stream = handle->stream;
607 
608 	return uvc_ioctl_enum_fmt(stream, fmt);
609 }
610 
611 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
612 				   struct v4l2_format *fmt)
613 {
614 	struct uvc_fh *handle = fh;
615 	struct uvc_streaming *stream = handle->stream;
616 
617 	return uvc_v4l2_get_format(stream, fmt);
618 }
619 
620 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
621 				   struct v4l2_format *fmt)
622 {
623 	struct uvc_fh *handle = fh;
624 	struct uvc_streaming *stream = handle->stream;
625 
626 	return uvc_v4l2_get_format(stream, fmt);
627 }
628 
629 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
630 				   struct v4l2_format *fmt)
631 {
632 	struct uvc_fh *handle = fh;
633 	struct uvc_streaming *stream = handle->stream;
634 	int ret;
635 
636 	ret = uvc_acquire_privileges(handle);
637 	if (ret < 0)
638 		return ret;
639 
640 	return uvc_v4l2_set_format(stream, fmt);
641 }
642 
643 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
644 				   struct v4l2_format *fmt)
645 {
646 	struct uvc_fh *handle = fh;
647 	struct uvc_streaming *stream = handle->stream;
648 	int ret;
649 
650 	ret = uvc_acquire_privileges(handle);
651 	if (ret < 0)
652 		return ret;
653 
654 	return uvc_v4l2_set_format(stream, fmt);
655 }
656 
657 static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
658 				     struct v4l2_format *fmt)
659 {
660 	struct uvc_fh *handle = fh;
661 	struct uvc_streaming *stream = handle->stream;
662 	struct uvc_streaming_control probe;
663 
664 	return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
665 }
666 
667 static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
668 				     struct v4l2_format *fmt)
669 {
670 	struct uvc_fh *handle = fh;
671 	struct uvc_streaming *stream = handle->stream;
672 	struct uvc_streaming_control probe;
673 
674 	return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
675 }
676 
677 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
678 			     struct v4l2_requestbuffers *rb)
679 {
680 	struct uvc_fh *handle = fh;
681 	struct uvc_streaming *stream = handle->stream;
682 	int ret;
683 
684 	ret = uvc_acquire_privileges(handle);
685 	if (ret < 0)
686 		return ret;
687 
688 	mutex_lock(&stream->mutex);
689 	ret = uvc_request_buffers(&stream->queue, rb);
690 	mutex_unlock(&stream->mutex);
691 	if (ret < 0)
692 		return ret;
693 
694 	if (ret == 0)
695 		uvc_dismiss_privileges(handle);
696 
697 	return 0;
698 }
699 
700 static int uvc_ioctl_querybuf(struct file *file, void *fh,
701 			      struct v4l2_buffer *buf)
702 {
703 	struct uvc_fh *handle = fh;
704 	struct uvc_streaming *stream = handle->stream;
705 
706 	if (!uvc_has_privileges(handle))
707 		return -EBUSY;
708 
709 	return uvc_query_buffer(&stream->queue, buf);
710 }
711 
712 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
713 {
714 	struct uvc_fh *handle = fh;
715 	struct uvc_streaming *stream = handle->stream;
716 
717 	if (!uvc_has_privileges(handle))
718 		return -EBUSY;
719 
720 	return uvc_queue_buffer(&stream->queue, buf);
721 }
722 
723 static int uvc_ioctl_expbuf(struct file *file, void *fh,
724 			    struct v4l2_exportbuffer *exp)
725 {
726 	struct uvc_fh *handle = fh;
727 	struct uvc_streaming *stream = handle->stream;
728 
729 	if (!uvc_has_privileges(handle))
730 		return -EBUSY;
731 
732 	return uvc_export_buffer(&stream->queue, exp);
733 }
734 
735 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
736 {
737 	struct uvc_fh *handle = fh;
738 	struct uvc_streaming *stream = handle->stream;
739 
740 	if (!uvc_has_privileges(handle))
741 		return -EBUSY;
742 
743 	return uvc_dequeue_buffer(&stream->queue, buf,
744 				  file->f_flags & O_NONBLOCK);
745 }
746 
747 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
748 				  struct v4l2_create_buffers *cb)
749 {
750 	struct uvc_fh *handle = fh;
751 	struct uvc_streaming *stream = handle->stream;
752 	int ret;
753 
754 	ret = uvc_acquire_privileges(handle);
755 	if (ret < 0)
756 		return ret;
757 
758 	return uvc_create_buffers(&stream->queue, cb);
759 }
760 
761 static int uvc_ioctl_streamon(struct file *file, void *fh,
762 			      enum v4l2_buf_type type)
763 {
764 	struct uvc_fh *handle = fh;
765 	struct uvc_streaming *stream = handle->stream;
766 	int ret;
767 
768 	if (!uvc_has_privileges(handle))
769 		return -EBUSY;
770 
771 	mutex_lock(&stream->mutex);
772 	ret = uvc_queue_streamon(&stream->queue, type);
773 	mutex_unlock(&stream->mutex);
774 
775 	return ret;
776 }
777 
778 static int uvc_ioctl_streamoff(struct file *file, void *fh,
779 			       enum v4l2_buf_type type)
780 {
781 	struct uvc_fh *handle = fh;
782 	struct uvc_streaming *stream = handle->stream;
783 
784 	if (!uvc_has_privileges(handle))
785 		return -EBUSY;
786 
787 	mutex_lock(&stream->mutex);
788 	uvc_queue_streamoff(&stream->queue, type);
789 	mutex_unlock(&stream->mutex);
790 
791 	return 0;
792 }
793 
794 static int uvc_ioctl_enum_input(struct file *file, void *fh,
795 				struct v4l2_input *input)
796 {
797 	struct uvc_fh *handle = fh;
798 	struct uvc_video_chain *chain = handle->chain;
799 	const struct uvc_entity *selector = chain->selector;
800 	struct uvc_entity *iterm = NULL;
801 	u32 index = input->index;
802 	int pin = 0;
803 
804 	if (selector == NULL ||
805 	    (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
806 		if (index != 0)
807 			return -EINVAL;
808 		list_for_each_entry(iterm, &chain->entities, chain) {
809 			if (UVC_ENTITY_IS_ITERM(iterm))
810 				break;
811 		}
812 		pin = iterm->id;
813 	} else if (index < selector->bNrInPins) {
814 		pin = selector->baSourceID[index];
815 		list_for_each_entry(iterm, &chain->entities, chain) {
816 			if (!UVC_ENTITY_IS_ITERM(iterm))
817 				continue;
818 			if (iterm->id == pin)
819 				break;
820 		}
821 	}
822 
823 	if (iterm == NULL || iterm->id != pin)
824 		return -EINVAL;
825 
826 	memset(input, 0, sizeof(*input));
827 	input->index = index;
828 	strlcpy(input->name, iterm->name, sizeof(input->name));
829 	if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
830 		input->type = V4L2_INPUT_TYPE_CAMERA;
831 
832 	return 0;
833 }
834 
835 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
836 {
837 	struct uvc_fh *handle = fh;
838 	struct uvc_video_chain *chain = handle->chain;
839 	int ret;
840 	u8 i;
841 
842 	if (chain->selector == NULL ||
843 	    (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
844 		*input = 0;
845 		return 0;
846 	}
847 
848 	ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
849 			     chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
850 			     &i, 1);
851 	if (ret < 0)
852 		return ret;
853 
854 	*input = i - 1;
855 	return 0;
856 }
857 
858 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
859 {
860 	struct uvc_fh *handle = fh;
861 	struct uvc_video_chain *chain = handle->chain;
862 	int ret;
863 	u32 i;
864 
865 	ret = uvc_acquire_privileges(handle);
866 	if (ret < 0)
867 		return ret;
868 
869 	if (chain->selector == NULL ||
870 	    (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
871 		if (input)
872 			return -EINVAL;
873 		return 0;
874 	}
875 
876 	if (input >= chain->selector->bNrInPins)
877 		return -EINVAL;
878 
879 	i = input + 1;
880 	return uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
881 			      chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
882 			      &i, 1);
883 }
884 
885 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
886 			       struct v4l2_queryctrl *qc)
887 {
888 	struct uvc_fh *handle = fh;
889 	struct uvc_video_chain *chain = handle->chain;
890 
891 	return uvc_query_v4l2_ctrl(chain, qc);
892 }
893 
894 static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
895 				    struct v4l2_query_ext_ctrl *qec)
896 {
897 	struct uvc_fh *handle = fh;
898 	struct uvc_video_chain *chain = handle->chain;
899 	struct v4l2_queryctrl qc = { qec->id };
900 	int ret;
901 
902 	ret = uvc_query_v4l2_ctrl(chain, &qc);
903 	if (ret)
904 		return ret;
905 
906 	qec->id = qc.id;
907 	qec->type = qc.type;
908 	strlcpy(qec->name, qc.name, sizeof(qec->name));
909 	qec->minimum = qc.minimum;
910 	qec->maximum = qc.maximum;
911 	qec->step = qc.step;
912 	qec->default_value = qc.default_value;
913 	qec->flags = qc.flags;
914 	qec->elem_size = 4;
915 	qec->elems = 1;
916 	qec->nr_of_dims = 0;
917 	memset(qec->dims, 0, sizeof(qec->dims));
918 	memset(qec->reserved, 0, sizeof(qec->reserved));
919 
920 	return 0;
921 }
922 
923 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
924 			    struct v4l2_control *ctrl)
925 {
926 	struct uvc_fh *handle = fh;
927 	struct uvc_video_chain *chain = handle->chain;
928 	struct v4l2_ext_control xctrl;
929 	int ret;
930 
931 	memset(&xctrl, 0, sizeof(xctrl));
932 	xctrl.id = ctrl->id;
933 
934 	ret = uvc_ctrl_begin(chain);
935 	if (ret < 0)
936 		return ret;
937 
938 	ret = uvc_ctrl_get(chain, &xctrl);
939 	uvc_ctrl_rollback(handle);
940 	if (ret < 0)
941 		return ret;
942 
943 	ctrl->value = xctrl.value;
944 	return 0;
945 }
946 
947 static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
948 			    struct v4l2_control *ctrl)
949 {
950 	struct uvc_fh *handle = fh;
951 	struct uvc_video_chain *chain = handle->chain;
952 	struct v4l2_ext_control xctrl;
953 	int ret;
954 
955 	memset(&xctrl, 0, sizeof(xctrl));
956 	xctrl.id = ctrl->id;
957 	xctrl.value = ctrl->value;
958 
959 	ret = uvc_ctrl_begin(chain);
960 	if (ret < 0)
961 		return ret;
962 
963 	ret = uvc_ctrl_set(chain, &xctrl);
964 	if (ret < 0) {
965 		uvc_ctrl_rollback(handle);
966 		return ret;
967 	}
968 
969 	ret = uvc_ctrl_commit(handle, &xctrl, 1);
970 	if (ret < 0)
971 		return ret;
972 
973 	ctrl->value = xctrl.value;
974 	return 0;
975 }
976 
977 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
978 				 struct v4l2_ext_controls *ctrls)
979 {
980 	struct uvc_fh *handle = fh;
981 	struct uvc_video_chain *chain = handle->chain;
982 	struct v4l2_ext_control *ctrl = ctrls->controls;
983 	unsigned int i;
984 	int ret;
985 
986 	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
987 		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
988 			struct v4l2_queryctrl qc = { .id = ctrl->id };
989 
990 			ret = uvc_query_v4l2_ctrl(chain, &qc);
991 			if (ret < 0) {
992 				ctrls->error_idx = i;
993 				return ret;
994 			}
995 
996 			ctrl->value = qc.default_value;
997 		}
998 
999 		return 0;
1000 	}
1001 
1002 	ret = uvc_ctrl_begin(chain);
1003 	if (ret < 0)
1004 		return ret;
1005 
1006 	for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1007 		ret = uvc_ctrl_get(chain, ctrl);
1008 		if (ret < 0) {
1009 			uvc_ctrl_rollback(handle);
1010 			ctrls->error_idx = i;
1011 			return ret;
1012 		}
1013 	}
1014 
1015 	ctrls->error_idx = 0;
1016 
1017 	return uvc_ctrl_rollback(handle);
1018 }
1019 
1020 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1021 				     struct v4l2_ext_controls *ctrls,
1022 				     bool commit)
1023 {
1024 	struct v4l2_ext_control *ctrl = ctrls->controls;
1025 	struct uvc_video_chain *chain = handle->chain;
1026 	unsigned int i;
1027 	int ret;
1028 
1029 	/* Default value cannot be changed */
1030 	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
1031 		return -EINVAL;
1032 
1033 	ret = uvc_ctrl_begin(chain);
1034 	if (ret < 0)
1035 		return ret;
1036 
1037 	for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1038 		ret = uvc_ctrl_set(chain, ctrl);
1039 		if (ret < 0) {
1040 			uvc_ctrl_rollback(handle);
1041 			ctrls->error_idx = commit ? ctrls->count : i;
1042 			return ret;
1043 		}
1044 	}
1045 
1046 	ctrls->error_idx = 0;
1047 
1048 	if (commit)
1049 		return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
1050 	else
1051 		return uvc_ctrl_rollback(handle);
1052 }
1053 
1054 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1055 				 struct v4l2_ext_controls *ctrls)
1056 {
1057 	struct uvc_fh *handle = fh;
1058 
1059 	return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
1060 }
1061 
1062 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1063 				   struct v4l2_ext_controls *ctrls)
1064 {
1065 	struct uvc_fh *handle = fh;
1066 
1067 	return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
1068 }
1069 
1070 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1071 			       struct v4l2_querymenu *qm)
1072 {
1073 	struct uvc_fh *handle = fh;
1074 	struct uvc_video_chain *chain = handle->chain;
1075 
1076 	return uvc_query_v4l2_menu(chain, qm);
1077 }
1078 
1079 static int uvc_ioctl_g_selection(struct file *file, void *fh,
1080 				 struct v4l2_selection *sel)
1081 {
1082 	struct uvc_fh *handle = fh;
1083 	struct uvc_streaming *stream = handle->stream;
1084 
1085 	if (sel->type != stream->type)
1086 		return -EINVAL;
1087 
1088 	switch (sel->target) {
1089 	case V4L2_SEL_TGT_CROP_DEFAULT:
1090 	case V4L2_SEL_TGT_CROP_BOUNDS:
1091 		if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1092 			return -EINVAL;
1093 		break;
1094 	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1095 	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1096 		if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1097 			return -EINVAL;
1098 		break;
1099 	default:
1100 		return -EINVAL;
1101 	}
1102 
1103 	sel->r.left = 0;
1104 	sel->r.top = 0;
1105 	mutex_lock(&stream->mutex);
1106 	sel->r.width = stream->cur_frame->wWidth;
1107 	sel->r.height = stream->cur_frame->wHeight;
1108 	mutex_unlock(&stream->mutex);
1109 
1110 	return 0;
1111 }
1112 
1113 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1114 			    struct v4l2_streamparm *parm)
1115 {
1116 	struct uvc_fh *handle = fh;
1117 	struct uvc_streaming *stream = handle->stream;
1118 
1119 	return uvc_v4l2_get_streamparm(stream, parm);
1120 }
1121 
1122 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1123 			    struct v4l2_streamparm *parm)
1124 {
1125 	struct uvc_fh *handle = fh;
1126 	struct uvc_streaming *stream = handle->stream;
1127 	int ret;
1128 
1129 	ret = uvc_acquire_privileges(handle);
1130 	if (ret < 0)
1131 		return ret;
1132 
1133 	return uvc_v4l2_set_streamparm(stream, parm);
1134 }
1135 
1136 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1137 				     struct v4l2_frmsizeenum *fsize)
1138 {
1139 	struct uvc_fh *handle = fh;
1140 	struct uvc_streaming *stream = handle->stream;
1141 	struct uvc_format *format = NULL;
1142 	struct uvc_frame *frame;
1143 	int i;
1144 
1145 	/* Look for the given pixel format */
1146 	for (i = 0; i < stream->nformats; i++) {
1147 		if (stream->format[i].fcc == fsize->pixel_format) {
1148 			format = &stream->format[i];
1149 			break;
1150 		}
1151 	}
1152 	if (format == NULL)
1153 		return -EINVAL;
1154 
1155 	if (fsize->index >= format->nframes)
1156 		return -EINVAL;
1157 
1158 	frame = &format->frame[fsize->index];
1159 	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1160 	fsize->discrete.width = frame->wWidth;
1161 	fsize->discrete.height = frame->wHeight;
1162 	return 0;
1163 }
1164 
1165 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1166 					 struct v4l2_frmivalenum *fival)
1167 {
1168 	struct uvc_fh *handle = fh;
1169 	struct uvc_streaming *stream = handle->stream;
1170 	struct uvc_format *format = NULL;
1171 	struct uvc_frame *frame = NULL;
1172 	int i;
1173 
1174 	/* Look for the given pixel format and frame size */
1175 	for (i = 0; i < stream->nformats; i++) {
1176 		if (stream->format[i].fcc == fival->pixel_format) {
1177 			format = &stream->format[i];
1178 			break;
1179 		}
1180 	}
1181 	if (format == NULL)
1182 		return -EINVAL;
1183 
1184 	for (i = 0; i < format->nframes; i++) {
1185 		if (format->frame[i].wWidth == fival->width &&
1186 		    format->frame[i].wHeight == fival->height) {
1187 			frame = &format->frame[i];
1188 			break;
1189 		}
1190 	}
1191 	if (frame == NULL)
1192 		return -EINVAL;
1193 
1194 	if (frame->bFrameIntervalType) {
1195 		if (fival->index >= frame->bFrameIntervalType)
1196 			return -EINVAL;
1197 
1198 		fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1199 		fival->discrete.numerator =
1200 			frame->dwFrameInterval[fival->index];
1201 		fival->discrete.denominator = 10000000;
1202 		uvc_simplify_fraction(&fival->discrete.numerator,
1203 			&fival->discrete.denominator, 8, 333);
1204 	} else {
1205 		if (fival->index)
1206 			return -EINVAL;
1207 
1208 		fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1209 		fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1210 		fival->stepwise.min.denominator = 10000000;
1211 		fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1212 		fival->stepwise.max.denominator = 10000000;
1213 		fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1214 		fival->stepwise.step.denominator = 10000000;
1215 		uvc_simplify_fraction(&fival->stepwise.min.numerator,
1216 			&fival->stepwise.min.denominator, 8, 333);
1217 		uvc_simplify_fraction(&fival->stepwise.max.numerator,
1218 			&fival->stepwise.max.denominator, 8, 333);
1219 		uvc_simplify_fraction(&fival->stepwise.step.numerator,
1220 			&fival->stepwise.step.denominator, 8, 333);
1221 	}
1222 
1223 	return 0;
1224 }
1225 
1226 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1227 				     const struct v4l2_event_subscription *sub)
1228 {
1229 	switch (sub->type) {
1230 	case V4L2_EVENT_CTRL:
1231 		return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1232 	default:
1233 		return -EINVAL;
1234 	}
1235 }
1236 
1237 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1238 			      unsigned int cmd, void *arg)
1239 {
1240 	struct uvc_fh *handle = fh;
1241 	struct uvc_video_chain *chain = handle->chain;
1242 
1243 	switch (cmd) {
1244 	/* Dynamic controls. */
1245 	case UVCIOC_CTRL_MAP:
1246 		return uvc_ioctl_ctrl_map(chain, arg);
1247 
1248 	case UVCIOC_CTRL_QUERY:
1249 		return uvc_xu_ctrl_query(chain, arg);
1250 
1251 	default:
1252 		return -ENOTTY;
1253 	}
1254 }
1255 
1256 #ifdef CONFIG_COMPAT
1257 struct uvc_xu_control_mapping32 {
1258 	__u32 id;
1259 	__u8 name[32];
1260 	__u8 entity[16];
1261 	__u8 selector;
1262 
1263 	__u8 size;
1264 	__u8 offset;
1265 	__u32 v4l2_type;
1266 	__u32 data_type;
1267 
1268 	compat_caddr_t menu_info;
1269 	__u32 menu_count;
1270 
1271 	__u32 reserved[4];
1272 };
1273 
1274 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1275 			const struct uvc_xu_control_mapping32 __user *up)
1276 {
1277 	compat_caddr_t p;
1278 
1279 	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1280 	    __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1281 	    __get_user(kp->menu_count, &up->menu_count))
1282 		return -EFAULT;
1283 
1284 	memset(kp->reserved, 0, sizeof(kp->reserved));
1285 
1286 	if (kp->menu_count == 0) {
1287 		kp->menu_info = NULL;
1288 		return 0;
1289 	}
1290 
1291 	if (__get_user(p, &up->menu_info))
1292 		return -EFAULT;
1293 	kp->menu_info = compat_ptr(p);
1294 
1295 	return 0;
1296 }
1297 
1298 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1299 			struct uvc_xu_control_mapping32 __user *up)
1300 {
1301 	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1302 	    __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1303 	    __put_user(kp->menu_count, &up->menu_count))
1304 		return -EFAULT;
1305 
1306 	if (__clear_user(up->reserved, sizeof(up->reserved)))
1307 		return -EFAULT;
1308 
1309 	return 0;
1310 }
1311 
1312 struct uvc_xu_control_query32 {
1313 	__u8 unit;
1314 	__u8 selector;
1315 	__u8 query;
1316 	__u16 size;
1317 	compat_caddr_t data;
1318 };
1319 
1320 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1321 			const struct uvc_xu_control_query32 __user *up)
1322 {
1323 	compat_caddr_t p;
1324 
1325 	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1326 	    __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1327 		return -EFAULT;
1328 
1329 	if (kp->size == 0) {
1330 		kp->data = NULL;
1331 		return 0;
1332 	}
1333 
1334 	if (__get_user(p, &up->data))
1335 		return -EFAULT;
1336 	kp->data = compat_ptr(p);
1337 
1338 	return 0;
1339 }
1340 
1341 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1342 			struct uvc_xu_control_query32 __user *up)
1343 {
1344 	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1345 	    __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1346 		return -EFAULT;
1347 
1348 	return 0;
1349 }
1350 
1351 #define UVCIOC_CTRL_MAP32	_IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1352 #define UVCIOC_CTRL_QUERY32	_IOWR('u', 0x21, struct uvc_xu_control_query32)
1353 
1354 static long uvc_v4l2_compat_ioctl32(struct file *file,
1355 		     unsigned int cmd, unsigned long arg)
1356 {
1357 	struct uvc_fh *handle = file->private_data;
1358 	union {
1359 		struct uvc_xu_control_mapping xmap;
1360 		struct uvc_xu_control_query xqry;
1361 	} karg;
1362 	void __user *up = compat_ptr(arg);
1363 	long ret;
1364 
1365 	switch (cmd) {
1366 	case UVCIOC_CTRL_MAP32:
1367 		ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1368 		if (ret)
1369 			return ret;
1370 		ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
1371 		if (ret)
1372 			return ret;
1373 		ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1374 		if (ret)
1375 			return ret;
1376 
1377 		break;
1378 
1379 	case UVCIOC_CTRL_QUERY32:
1380 		ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1381 		if (ret)
1382 			return ret;
1383 		ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
1384 		if (ret)
1385 			return ret;
1386 		ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1387 		if (ret)
1388 			return ret;
1389 		break;
1390 
1391 	default:
1392 		return -ENOIOCTLCMD;
1393 	}
1394 
1395 	return ret;
1396 }
1397 #endif
1398 
1399 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1400 		    size_t count, loff_t *ppos)
1401 {
1402 	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1403 	return -EINVAL;
1404 }
1405 
1406 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1407 {
1408 	struct uvc_fh *handle = file->private_data;
1409 	struct uvc_streaming *stream = handle->stream;
1410 
1411 	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1412 
1413 	return uvc_queue_mmap(&stream->queue, vma);
1414 }
1415 
1416 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1417 {
1418 	struct uvc_fh *handle = file->private_data;
1419 	struct uvc_streaming *stream = handle->stream;
1420 
1421 	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1422 
1423 	return uvc_queue_poll(&stream->queue, file, wait);
1424 }
1425 
1426 #ifndef CONFIG_MMU
1427 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1428 		unsigned long addr, unsigned long len, unsigned long pgoff,
1429 		unsigned long flags)
1430 {
1431 	struct uvc_fh *handle = file->private_data;
1432 	struct uvc_streaming *stream = handle->stream;
1433 
1434 	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1435 
1436 	return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1437 }
1438 #endif
1439 
1440 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1441 	.vidioc_querycap = uvc_ioctl_querycap,
1442 	.vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1443 	.vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1444 	.vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1445 	.vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1446 	.vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1447 	.vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1448 	.vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1449 	.vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1450 	.vidioc_reqbufs = uvc_ioctl_reqbufs,
1451 	.vidioc_querybuf = uvc_ioctl_querybuf,
1452 	.vidioc_qbuf = uvc_ioctl_qbuf,
1453 	.vidioc_expbuf = uvc_ioctl_expbuf,
1454 	.vidioc_dqbuf = uvc_ioctl_dqbuf,
1455 	.vidioc_create_bufs = uvc_ioctl_create_bufs,
1456 	.vidioc_streamon = uvc_ioctl_streamon,
1457 	.vidioc_streamoff = uvc_ioctl_streamoff,
1458 	.vidioc_enum_input = uvc_ioctl_enum_input,
1459 	.vidioc_g_input = uvc_ioctl_g_input,
1460 	.vidioc_s_input = uvc_ioctl_s_input,
1461 	.vidioc_queryctrl = uvc_ioctl_queryctrl,
1462 	.vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1463 	.vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1464 	.vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1465 	.vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1466 	.vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1467 	.vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1468 	.vidioc_querymenu = uvc_ioctl_querymenu,
1469 	.vidioc_g_selection = uvc_ioctl_g_selection,
1470 	.vidioc_g_parm = uvc_ioctl_g_parm,
1471 	.vidioc_s_parm = uvc_ioctl_s_parm,
1472 	.vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1473 	.vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1474 	.vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1475 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1476 	.vidioc_default = uvc_ioctl_default,
1477 };
1478 
1479 const struct v4l2_file_operations uvc_fops = {
1480 	.owner		= THIS_MODULE,
1481 	.open		= uvc_v4l2_open,
1482 	.release	= uvc_v4l2_release,
1483 	.unlocked_ioctl	= video_ioctl2,
1484 #ifdef CONFIG_COMPAT
1485 	.compat_ioctl32	= uvc_v4l2_compat_ioctl32,
1486 #endif
1487 	.read		= uvc_v4l2_read,
1488 	.mmap		= uvc_v4l2_mmap,
1489 	.poll		= uvc_v4l2_poll,
1490 #ifndef CONFIG_MMU
1491 	.get_unmapped_area = uvc_v4l2_get_unmapped_area,
1492 #endif
1493 };
1494 
1495