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[deliverable/linux.git] / drivers / media / usb / uvc / uvc_v4l2.c
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 struct uvc_menu_info __user *umenus;
1278 struct uvc_menu_info __user *kmenus;
1279 compat_caddr_t p;
1280
1281 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1282 __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1283 __get_user(kp->menu_count, &up->menu_count))
1284 return -EFAULT;
1285
1286 memset(kp->reserved, 0, sizeof(kp->reserved));
1287
1288 if (kp->menu_count == 0) {
1289 kp->menu_info = NULL;
1290 return 0;
1291 }
1292
1293 if (__get_user(p, &up->menu_info))
1294 return -EFAULT;
1295 umenus = compat_ptr(p);
1296 if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus)))
1297 return -EFAULT;
1298
1299 kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus));
1300 if (kmenus == NULL)
1301 return -EFAULT;
1302 kp->menu_info = kmenus;
1303
1304 if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus)))
1305 return -EFAULT;
1306
1307 return 0;
1308 }
1309
1310 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1311 struct uvc_xu_control_mapping32 __user *up)
1312 {
1313 struct uvc_menu_info __user *umenus;
1314 struct uvc_menu_info __user *kmenus = kp->menu_info;
1315 compat_caddr_t p;
1316
1317 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1318 __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1319 __put_user(kp->menu_count, &up->menu_count))
1320 return -EFAULT;
1321
1322 if (__clear_user(up->reserved, sizeof(up->reserved)))
1323 return -EFAULT;
1324
1325 if (kp->menu_count == 0)
1326 return 0;
1327
1328 if (get_user(p, &up->menu_info))
1329 return -EFAULT;
1330 umenus = compat_ptr(p);
1331
1332 if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus)))
1333 return -EFAULT;
1334
1335 return 0;
1336 }
1337
1338 struct uvc_xu_control_query32 {
1339 __u8 unit;
1340 __u8 selector;
1341 __u8 query;
1342 __u16 size;
1343 compat_caddr_t data;
1344 };
1345
1346 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1347 const struct uvc_xu_control_query32 __user *up)
1348 {
1349 u8 __user *udata;
1350 u8 __user *kdata;
1351 compat_caddr_t p;
1352
1353 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1354 __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1355 return -EFAULT;
1356
1357 if (kp->size == 0) {
1358 kp->data = NULL;
1359 return 0;
1360 }
1361
1362 if (__get_user(p, &up->data))
1363 return -EFAULT;
1364 udata = compat_ptr(p);
1365 if (!access_ok(VERIFY_READ, udata, kp->size))
1366 return -EFAULT;
1367
1368 kdata = compat_alloc_user_space(kp->size);
1369 if (kdata == NULL)
1370 return -EFAULT;
1371 kp->data = kdata;
1372
1373 if (copy_in_user(kdata, udata, kp->size))
1374 return -EFAULT;
1375
1376 return 0;
1377 }
1378
1379 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1380 struct uvc_xu_control_query32 __user *up)
1381 {
1382 u8 __user *udata;
1383 u8 __user *kdata = kp->data;
1384 compat_caddr_t p;
1385
1386 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1387 __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1388 return -EFAULT;
1389
1390 if (kp->size == 0)
1391 return 0;
1392
1393 if (get_user(p, &up->data))
1394 return -EFAULT;
1395 udata = compat_ptr(p);
1396 if (!access_ok(VERIFY_READ, udata, kp->size))
1397 return -EFAULT;
1398
1399 if (copy_in_user(udata, kdata, kp->size))
1400 return -EFAULT;
1401
1402 return 0;
1403 }
1404
1405 #define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1406 #define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32)
1407
1408 static long uvc_v4l2_compat_ioctl32(struct file *file,
1409 unsigned int cmd, unsigned long arg)
1410 {
1411 union {
1412 struct uvc_xu_control_mapping xmap;
1413 struct uvc_xu_control_query xqry;
1414 } karg;
1415 void __user *up = compat_ptr(arg);
1416 mm_segment_t old_fs;
1417 long ret;
1418
1419 switch (cmd) {
1420 case UVCIOC_CTRL_MAP32:
1421 cmd = UVCIOC_CTRL_MAP;
1422 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1423 break;
1424
1425 case UVCIOC_CTRL_QUERY32:
1426 cmd = UVCIOC_CTRL_QUERY;
1427 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1428 break;
1429
1430 default:
1431 return -ENOIOCTLCMD;
1432 }
1433
1434 old_fs = get_fs();
1435 set_fs(KERNEL_DS);
1436 ret = video_ioctl2(file, cmd, (unsigned long)&karg);
1437 set_fs(old_fs);
1438
1439 if (ret < 0)
1440 return ret;
1441
1442 switch (cmd) {
1443 case UVCIOC_CTRL_MAP:
1444 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1445 break;
1446
1447 case UVCIOC_CTRL_QUERY:
1448 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1449 break;
1450 }
1451
1452 return ret;
1453 }
1454 #endif
1455
1456 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1457 size_t count, loff_t *ppos)
1458 {
1459 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1460 return -EINVAL;
1461 }
1462
1463 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1464 {
1465 struct uvc_fh *handle = file->private_data;
1466 struct uvc_streaming *stream = handle->stream;
1467
1468 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1469
1470 return uvc_queue_mmap(&stream->queue, vma);
1471 }
1472
1473 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1474 {
1475 struct uvc_fh *handle = file->private_data;
1476 struct uvc_streaming *stream = handle->stream;
1477
1478 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1479
1480 return uvc_queue_poll(&stream->queue, file, wait);
1481 }
1482
1483 #ifndef CONFIG_MMU
1484 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1485 unsigned long addr, unsigned long len, unsigned long pgoff,
1486 unsigned long flags)
1487 {
1488 struct uvc_fh *handle = file->private_data;
1489 struct uvc_streaming *stream = handle->stream;
1490
1491 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1492
1493 return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1494 }
1495 #endif
1496
1497 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1498 .vidioc_querycap = uvc_ioctl_querycap,
1499 .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1500 .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1501 .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1502 .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1503 .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1504 .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1505 .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1506 .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1507 .vidioc_reqbufs = uvc_ioctl_reqbufs,
1508 .vidioc_querybuf = uvc_ioctl_querybuf,
1509 .vidioc_qbuf = uvc_ioctl_qbuf,
1510 .vidioc_expbuf = uvc_ioctl_expbuf,
1511 .vidioc_dqbuf = uvc_ioctl_dqbuf,
1512 .vidioc_create_bufs = uvc_ioctl_create_bufs,
1513 .vidioc_streamon = uvc_ioctl_streamon,
1514 .vidioc_streamoff = uvc_ioctl_streamoff,
1515 .vidioc_enum_input = uvc_ioctl_enum_input,
1516 .vidioc_g_input = uvc_ioctl_g_input,
1517 .vidioc_s_input = uvc_ioctl_s_input,
1518 .vidioc_queryctrl = uvc_ioctl_queryctrl,
1519 .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1520 .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1521 .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1522 .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1523 .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1524 .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1525 .vidioc_querymenu = uvc_ioctl_querymenu,
1526 .vidioc_g_selection = uvc_ioctl_g_selection,
1527 .vidioc_g_parm = uvc_ioctl_g_parm,
1528 .vidioc_s_parm = uvc_ioctl_s_parm,
1529 .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1530 .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1531 .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1532 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1533 .vidioc_default = uvc_ioctl_default,
1534 };
1535
1536 const struct v4l2_file_operations uvc_fops = {
1537 .owner = THIS_MODULE,
1538 .open = uvc_v4l2_open,
1539 .release = uvc_v4l2_release,
1540 .unlocked_ioctl = video_ioctl2,
1541 #ifdef CONFIG_COMPAT
1542 .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1543 #endif
1544 .read = uvc_v4l2_read,
1545 .mmap = uvc_v4l2_mmap,
1546 .poll = uvc_v4l2_poll,
1547 #ifndef CONFIG_MMU
1548 .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1549 #endif
1550 };
1551
Linux kernel - Deliverables
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