1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * uvc_v4l2.c -- USB Video Class driver - V4L2 API
4 *
5 * Copyright (C) 2005-2010
6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 */
8
9 #include <linux/compat.h>
10 #include <linux/kernel.h>
11 #include <linux/list.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/usb.h>
15 #include <linux/videodev2.h>
16 #include <linux/vmalloc.h>
17 #include <linux/mm.h>
18 #include <linux/wait.h>
19 #include <linux/atomic.h>
20
21 #include <media/v4l2-common.h>
22 #include <media/v4l2-ctrls.h>
23 #include <media/v4l2-event.h>
24 #include <media/v4l2-ioctl.h>
25
26 #include "uvcvideo.h"
27
28 /* ------------------------------------------------------------------------
29 * UVC ioctls
30 */
uvc_ioctl_ctrl_map(struct uvc_video_chain * chain,struct uvc_xu_control_mapping * xmap)31 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
32 struct uvc_xu_control_mapping *xmap)
33 {
34 struct uvc_control_mapping *map;
35 unsigned int size;
36 int ret;
37
38 map = kzalloc(sizeof(*map), GFP_KERNEL);
39 if (map == NULL)
40 return -ENOMEM;
41
42 map->id = xmap->id;
43 /* Non standard control id. */
44 if (v4l2_ctrl_get_name(map->id) == NULL) {
45 map->name = kmemdup(xmap->name, sizeof(xmap->name),
46 GFP_KERNEL);
47 if (!map->name) {
48 ret = -ENOMEM;
49 goto free_map;
50 }
51 }
52 memcpy(map->entity, xmap->entity, sizeof(map->entity));
53 map->selector = xmap->selector;
54 map->size = xmap->size;
55 map->offset = xmap->offset;
56 map->v4l2_type = xmap->v4l2_type;
57 map->data_type = xmap->data_type;
58
59 switch (xmap->v4l2_type) {
60 case V4L2_CTRL_TYPE_INTEGER:
61 case V4L2_CTRL_TYPE_BOOLEAN:
62 case V4L2_CTRL_TYPE_BUTTON:
63 break;
64
65 case V4L2_CTRL_TYPE_MENU:
66 /* Prevent excessive memory consumption, as well as integer
67 * overflows.
68 */
69 if (xmap->menu_count == 0 ||
70 xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
71 ret = -EINVAL;
72 goto free_map;
73 }
74
75 size = xmap->menu_count * sizeof(*map->menu_info);
76 map->menu_info = memdup_user(xmap->menu_info, size);
77 if (IS_ERR(map->menu_info)) {
78 ret = PTR_ERR(map->menu_info);
79 goto free_map;
80 }
81
82 map->menu_count = xmap->menu_count;
83 break;
84
85 default:
86 uvc_dbg(chain->dev, CONTROL,
87 "Unsupported V4L2 control type %u\n", xmap->v4l2_type);
88 ret = -ENOTTY;
89 goto free_map;
90 }
91
92 ret = uvc_ctrl_add_mapping(chain, map);
93
94 kfree(map->menu_info);
95 free_map:
96 kfree(map);
97
98 return ret;
99 }
100
101 /* ------------------------------------------------------------------------
102 * V4L2 interface
103 */
104
105 /*
106 * Find the frame interval closest to the requested frame interval for the
107 * given frame format and size. This should be done by the device as part of
108 * the Video Probe and Commit negotiation, but some hardware don't implement
109 * that feature.
110 */
uvc_try_frame_interval(struct uvc_frame * frame,u32 interval)111 static u32 uvc_try_frame_interval(struct uvc_frame *frame, u32 interval)
112 {
113 unsigned int i;
114
115 if (frame->bFrameIntervalType) {
116 u32 best = -1, dist;
117
118 for (i = 0; i < frame->bFrameIntervalType; ++i) {
119 dist = interval > frame->dwFrameInterval[i]
120 ? interval - frame->dwFrameInterval[i]
121 : frame->dwFrameInterval[i] - interval;
122
123 if (dist > best)
124 break;
125
126 best = dist;
127 }
128
129 interval = frame->dwFrameInterval[i-1];
130 } else {
131 const u32 min = frame->dwFrameInterval[0];
132 const u32 max = frame->dwFrameInterval[1];
133 const u32 step = frame->dwFrameInterval[2];
134
135 interval = min + (interval - min + step/2) / step * step;
136 if (interval > max)
137 interval = max;
138 }
139
140 return interval;
141 }
142
uvc_v4l2_get_bytesperline(const struct uvc_format * format,const struct uvc_frame * frame)143 static u32 uvc_v4l2_get_bytesperline(const struct uvc_format *format,
144 const struct uvc_frame *frame)
145 {
146 switch (format->fcc) {
147 case V4L2_PIX_FMT_NV12:
148 case V4L2_PIX_FMT_YVU420:
149 case V4L2_PIX_FMT_YUV420:
150 case V4L2_PIX_FMT_M420:
151 return frame->wWidth;
152
153 default:
154 return format->bpp * frame->wWidth / 8;
155 }
156 }
157
uvc_v4l2_try_format(struct uvc_streaming * stream,struct v4l2_format * fmt,struct uvc_streaming_control * probe,struct uvc_format ** uvc_format,struct uvc_frame ** uvc_frame)158 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
159 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
160 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
161 {
162 struct uvc_format *format = NULL;
163 struct uvc_frame *frame = NULL;
164 u16 rw, rh;
165 unsigned int d, maxd;
166 unsigned int i;
167 u32 interval;
168 int ret = 0;
169 u8 *fcc;
170
171 if (fmt->type != stream->type)
172 return -EINVAL;
173
174 fcc = (u8 *)&fmt->fmt.pix.pixelformat;
175 uvc_dbg(stream->dev, FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u\n",
176 fmt->fmt.pix.pixelformat,
177 fcc[0], fcc[1], fcc[2], fcc[3],
178 fmt->fmt.pix.width, fmt->fmt.pix.height);
179
180 /* Check if the hardware supports the requested format, use the default
181 * format otherwise.
182 */
183 for (i = 0; i < stream->nformats; ++i) {
184 format = &stream->format[i];
185 if (format->fcc == fmt->fmt.pix.pixelformat)
186 break;
187 }
188
189 if (i == stream->nformats) {
190 format = stream->def_format;
191 fmt->fmt.pix.pixelformat = format->fcc;
192 }
193
194 /* Find the closest image size. The distance between image sizes is
195 * the size in pixels of the non-overlapping regions between the
196 * requested size and the frame-specified size.
197 */
198 rw = fmt->fmt.pix.width;
199 rh = fmt->fmt.pix.height;
200 maxd = (unsigned int)-1;
201
202 for (i = 0; i < format->nframes; ++i) {
203 u16 w = format->frame[i].wWidth;
204 u16 h = format->frame[i].wHeight;
205
206 d = min(w, rw) * min(h, rh);
207 d = w*h + rw*rh - 2*d;
208 if (d < maxd) {
209 maxd = d;
210 frame = &format->frame[i];
211 }
212
213 if (maxd == 0)
214 break;
215 }
216
217 if (frame == NULL) {
218 uvc_dbg(stream->dev, FORMAT, "Unsupported size %ux%u\n",
219 fmt->fmt.pix.width, fmt->fmt.pix.height);
220 return -EINVAL;
221 }
222
223 /* Use the default frame interval. */
224 interval = frame->dwDefaultFrameInterval;
225 uvc_dbg(stream->dev, FORMAT,
226 "Using default frame interval %u.%u us (%u.%u fps)\n",
227 interval / 10, interval % 10, 10000000 / interval,
228 (100000000 / interval) % 10);
229
230 /* Set the format index, frame index and frame interval. */
231 memset(probe, 0, sizeof(*probe));
232 probe->bmHint = 1; /* dwFrameInterval */
233 probe->bFormatIndex = format->index;
234 probe->bFrameIndex = frame->bFrameIndex;
235 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
236 /* Some webcams stall the probe control set request when the
237 * dwMaxVideoFrameSize field is set to zero. The UVC specification
238 * clearly states that the field is read-only from the host, so this
239 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
240 * the webcam to work around the problem.
241 *
242 * The workaround could probably be enabled for all webcams, so the
243 * quirk can be removed if needed. It's currently useful to detect
244 * webcam bugs and fix them before they hit the market (providing
245 * developers test their webcams with the Linux driver as well as with
246 * the Windows driver).
247 */
248 mutex_lock(&stream->mutex);
249 if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
250 probe->dwMaxVideoFrameSize =
251 stream->ctrl.dwMaxVideoFrameSize;
252
253 /* Probe the device. */
254 ret = uvc_probe_video(stream, probe);
255 mutex_unlock(&stream->mutex);
256 if (ret < 0)
257 goto done;
258
259 /* After the probe, update fmt with the values returned from
260 * negotiation with the device. Some devices return invalid bFormatIndex
261 * and bFrameIndex values, in which case we can only assume they have
262 * accepted the requested format as-is.
263 */
264 for (i = 0; i < stream->nformats; ++i) {
265 if (probe->bFormatIndex == stream->format[i].index) {
266 format = &stream->format[i];
267 break;
268 }
269 }
270
271 if (i == stream->nformats)
272 uvc_dbg(stream->dev, FORMAT,
273 "Unknown bFormatIndex %u, using default\n",
274 probe->bFormatIndex);
275
276 for (i = 0; i < format->nframes; ++i) {
277 if (probe->bFrameIndex == format->frame[i].bFrameIndex) {
278 frame = &format->frame[i];
279 break;
280 }
281 }
282
283 if (i == format->nframes)
284 uvc_dbg(stream->dev, FORMAT,
285 "Unknown bFrameIndex %u, using default\n",
286 probe->bFrameIndex);
287
288 fmt->fmt.pix.width = frame->wWidth;
289 fmt->fmt.pix.height = frame->wHeight;
290 fmt->fmt.pix.field = V4L2_FIELD_NONE;
291 fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
292 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
293 fmt->fmt.pix.pixelformat = format->fcc;
294 fmt->fmt.pix.colorspace = format->colorspace;
295 fmt->fmt.pix.xfer_func = format->xfer_func;
296 fmt->fmt.pix.ycbcr_enc = format->ycbcr_enc;
297
298 if (uvc_format != NULL)
299 *uvc_format = format;
300 if (uvc_frame != NULL)
301 *uvc_frame = frame;
302
303 done:
304 return ret;
305 }
306
uvc_v4l2_get_format(struct uvc_streaming * stream,struct v4l2_format * fmt)307 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
308 struct v4l2_format *fmt)
309 {
310 struct uvc_format *format;
311 struct uvc_frame *frame;
312 int ret = 0;
313
314 if (fmt->type != stream->type)
315 return -EINVAL;
316
317 mutex_lock(&stream->mutex);
318 format = stream->cur_format;
319 frame = stream->cur_frame;
320
321 if (format == NULL || frame == NULL) {
322 ret = -EINVAL;
323 goto done;
324 }
325
326 fmt->fmt.pix.pixelformat = format->fcc;
327 fmt->fmt.pix.width = frame->wWidth;
328 fmt->fmt.pix.height = frame->wHeight;
329 fmt->fmt.pix.field = V4L2_FIELD_NONE;
330 fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
331 fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
332 fmt->fmt.pix.colorspace = format->colorspace;
333 fmt->fmt.pix.xfer_func = format->xfer_func;
334 fmt->fmt.pix.ycbcr_enc = format->ycbcr_enc;
335
336 done:
337 mutex_unlock(&stream->mutex);
338 return ret;
339 }
340
uvc_v4l2_set_format(struct uvc_streaming * stream,struct v4l2_format * fmt)341 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
342 struct v4l2_format *fmt)
343 {
344 struct uvc_streaming_control probe;
345 struct uvc_format *format;
346 struct uvc_frame *frame;
347 int ret;
348
349 if (fmt->type != stream->type)
350 return -EINVAL;
351
352 ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
353 if (ret < 0)
354 return ret;
355
356 mutex_lock(&stream->mutex);
357
358 if (uvc_queue_allocated(&stream->queue)) {
359 ret = -EBUSY;
360 goto done;
361 }
362
363 stream->ctrl = probe;
364 stream->cur_format = format;
365 stream->cur_frame = frame;
366
367 done:
368 mutex_unlock(&stream->mutex);
369 return ret;
370 }
371
uvc_v4l2_get_streamparm(struct uvc_streaming * stream,struct v4l2_streamparm * parm)372 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
373 struct v4l2_streamparm *parm)
374 {
375 u32 numerator, denominator;
376
377 if (parm->type != stream->type)
378 return -EINVAL;
379
380 mutex_lock(&stream->mutex);
381 numerator = stream->ctrl.dwFrameInterval;
382 mutex_unlock(&stream->mutex);
383
384 denominator = 10000000;
385 v4l2_simplify_fraction(&numerator, &denominator, 8, 333);
386
387 memset(parm, 0, sizeof(*parm));
388 parm->type = stream->type;
389
390 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
391 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
392 parm->parm.capture.capturemode = 0;
393 parm->parm.capture.timeperframe.numerator = numerator;
394 parm->parm.capture.timeperframe.denominator = denominator;
395 parm->parm.capture.extendedmode = 0;
396 parm->parm.capture.readbuffers = 0;
397 } else {
398 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
399 parm->parm.output.outputmode = 0;
400 parm->parm.output.timeperframe.numerator = numerator;
401 parm->parm.output.timeperframe.denominator = denominator;
402 }
403
404 return 0;
405 }
406
uvc_v4l2_set_streamparm(struct uvc_streaming * stream,struct v4l2_streamparm * parm)407 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
408 struct v4l2_streamparm *parm)
409 {
410 struct uvc_streaming_control probe;
411 struct v4l2_fract timeperframe;
412 struct uvc_format *format;
413 struct uvc_frame *frame;
414 u32 interval, maxd;
415 unsigned int i;
416 int ret;
417
418 if (parm->type != stream->type)
419 return -EINVAL;
420
421 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
422 timeperframe = parm->parm.capture.timeperframe;
423 else
424 timeperframe = parm->parm.output.timeperframe;
425
426 interval = v4l2_fraction_to_interval(timeperframe.numerator,
427 timeperframe.denominator);
428 uvc_dbg(stream->dev, FORMAT, "Setting frame interval to %u/%u (%u)\n",
429 timeperframe.numerator, timeperframe.denominator, interval);
430
431 mutex_lock(&stream->mutex);
432
433 if (uvc_queue_streaming(&stream->queue)) {
434 mutex_unlock(&stream->mutex);
435 return -EBUSY;
436 }
437
438 format = stream->cur_format;
439 frame = stream->cur_frame;
440 probe = stream->ctrl;
441 probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
442 maxd = abs((s32)probe.dwFrameInterval - interval);
443
444 /* Try frames with matching size to find the best frame interval. */
445 for (i = 0; i < format->nframes && maxd != 0; i++) {
446 u32 d, ival;
447
448 if (&format->frame[i] == stream->cur_frame)
449 continue;
450
451 if (format->frame[i].wWidth != stream->cur_frame->wWidth ||
452 format->frame[i].wHeight != stream->cur_frame->wHeight)
453 continue;
454
455 ival = uvc_try_frame_interval(&format->frame[i], interval);
456 d = abs((s32)ival - interval);
457 if (d >= maxd)
458 continue;
459
460 frame = &format->frame[i];
461 probe.bFrameIndex = frame->bFrameIndex;
462 probe.dwFrameInterval = ival;
463 maxd = d;
464 }
465
466 /* Probe the device with the new settings. */
467 ret = uvc_probe_video(stream, &probe);
468 if (ret < 0) {
469 mutex_unlock(&stream->mutex);
470 return ret;
471 }
472
473 stream->ctrl = probe;
474 stream->cur_frame = frame;
475 mutex_unlock(&stream->mutex);
476
477 /* Return the actual frame period. */
478 timeperframe.numerator = probe.dwFrameInterval;
479 timeperframe.denominator = 10000000;
480 v4l2_simplify_fraction(&timeperframe.numerator,
481 &timeperframe.denominator, 8, 333);
482
483 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
484 parm->parm.capture.timeperframe = timeperframe;
485 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
486 } else {
487 parm->parm.output.timeperframe = timeperframe;
488 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
489 }
490
491 return 0;
492 }
493
494 /* ------------------------------------------------------------------------
495 * Privilege management
496 */
497
498 /*
499 * Privilege management is the multiple-open implementation basis. The current
500 * implementation is completely transparent for the end-user and doesn't
501 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
502 * Those ioctls enable finer control on the device (by making possible for a
503 * user to request exclusive access to a device), but are not mature yet.
504 * Switching to the V4L2 priority mechanism might be considered in the future
505 * if this situation changes.
506 *
507 * Each open instance of a UVC device can either be in a privileged or
508 * unprivileged state. Only a single instance can be in a privileged state at
509 * a given time. Trying to perform an operation that requires privileges will
510 * automatically acquire the required privileges if possible, or return -EBUSY
511 * otherwise. Privileges are dismissed when closing the instance or when
512 * freeing the video buffers using VIDIOC_REQBUFS.
513 *
514 * Operations that require privileges are:
515 *
516 * - VIDIOC_S_INPUT
517 * - VIDIOC_S_PARM
518 * - VIDIOC_S_FMT
519 * - VIDIOC_REQBUFS
520 */
uvc_acquire_privileges(struct uvc_fh * handle)521 static int uvc_acquire_privileges(struct uvc_fh *handle)
522 {
523 /* Always succeed if the handle is already privileged. */
524 if (handle->state == UVC_HANDLE_ACTIVE)
525 return 0;
526
527 /* Check if the device already has a privileged handle. */
528 if (atomic_inc_return(&handle->stream->active) != 1) {
529 atomic_dec(&handle->stream->active);
530 return -EBUSY;
531 }
532
533 handle->state = UVC_HANDLE_ACTIVE;
534 return 0;
535 }
536
uvc_dismiss_privileges(struct uvc_fh * handle)537 static void uvc_dismiss_privileges(struct uvc_fh *handle)
538 {
539 if (handle->state == UVC_HANDLE_ACTIVE)
540 atomic_dec(&handle->stream->active);
541
542 handle->state = UVC_HANDLE_PASSIVE;
543 }
544
uvc_has_privileges(struct uvc_fh * handle)545 static int uvc_has_privileges(struct uvc_fh *handle)
546 {
547 return handle->state == UVC_HANDLE_ACTIVE;
548 }
549
550 /* ------------------------------------------------------------------------
551 * V4L2 file operations
552 */
553
uvc_v4l2_open(struct file * file)554 static int uvc_v4l2_open(struct file *file)
555 {
556 struct uvc_streaming *stream;
557 struct uvc_fh *handle;
558 int ret = 0;
559
560 stream = video_drvdata(file);
561 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
562
563 ret = usb_autopm_get_interface(stream->dev->intf);
564 if (ret < 0)
565 return ret;
566
567 /* Create the device handle. */
568 handle = kzalloc(sizeof(*handle), GFP_KERNEL);
569 if (handle == NULL) {
570 usb_autopm_put_interface(stream->dev->intf);
571 return -ENOMEM;
572 }
573
574 mutex_lock(&stream->dev->lock);
575 if (stream->dev->users == 0) {
576 ret = uvc_status_start(stream->dev, GFP_KERNEL);
577 if (ret < 0) {
578 mutex_unlock(&stream->dev->lock);
579 usb_autopm_put_interface(stream->dev->intf);
580 kfree(handle);
581 return ret;
582 }
583 }
584
585 stream->dev->users++;
586 mutex_unlock(&stream->dev->lock);
587
588 v4l2_fh_init(&handle->vfh, &stream->vdev);
589 v4l2_fh_add(&handle->vfh);
590 handle->chain = stream->chain;
591 handle->stream = stream;
592 handle->state = UVC_HANDLE_PASSIVE;
593 file->private_data = handle;
594
595 return 0;
596 }
597
uvc_v4l2_release(struct file * file)598 static int uvc_v4l2_release(struct file *file)
599 {
600 struct uvc_fh *handle = file->private_data;
601 struct uvc_streaming *stream = handle->stream;
602
603 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
604
605 /* Only free resources if this is a privileged handle. */
606 if (uvc_has_privileges(handle))
607 uvc_queue_release(&stream->queue);
608
609 /* Release the file handle. */
610 uvc_dismiss_privileges(handle);
611 v4l2_fh_del(&handle->vfh);
612 v4l2_fh_exit(&handle->vfh);
613 kfree(handle);
614 file->private_data = NULL;
615
616 mutex_lock(&stream->dev->lock);
617 if (--stream->dev->users == 0)
618 uvc_status_stop(stream->dev);
619 mutex_unlock(&stream->dev->lock);
620
621 usb_autopm_put_interface(stream->dev->intf);
622 return 0;
623 }
624
uvc_ioctl_querycap(struct file * file,void * fh,struct v4l2_capability * cap)625 static int uvc_ioctl_querycap(struct file *file, void *fh,
626 struct v4l2_capability *cap)
627 {
628 struct video_device *vdev = video_devdata(file);
629 struct uvc_fh *handle = file->private_data;
630 struct uvc_video_chain *chain = handle->chain;
631 struct uvc_streaming *stream = handle->stream;
632
633 strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
634 strscpy(cap->card, vdev->name, sizeof(cap->card));
635 usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
636 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
637 | chain->caps;
638
639 return 0;
640 }
641
uvc_ioctl_enum_fmt(struct uvc_streaming * stream,struct v4l2_fmtdesc * fmt)642 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
643 struct v4l2_fmtdesc *fmt)
644 {
645 struct uvc_format *format;
646 enum v4l2_buf_type type = fmt->type;
647 u32 index = fmt->index;
648
649 if (fmt->type != stream->type || fmt->index >= stream->nformats)
650 return -EINVAL;
651
652 memset(fmt, 0, sizeof(*fmt));
653 fmt->index = index;
654 fmt->type = type;
655
656 format = &stream->format[fmt->index];
657 fmt->flags = 0;
658 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
659 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
660 fmt->pixelformat = format->fcc;
661 return 0;
662 }
663
uvc_ioctl_enum_fmt_vid_cap(struct file * file,void * fh,struct v4l2_fmtdesc * fmt)664 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
665 struct v4l2_fmtdesc *fmt)
666 {
667 struct uvc_fh *handle = fh;
668 struct uvc_streaming *stream = handle->stream;
669
670 return uvc_ioctl_enum_fmt(stream, fmt);
671 }
672
uvc_ioctl_enum_fmt_vid_out(struct file * file,void * fh,struct v4l2_fmtdesc * fmt)673 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
674 struct v4l2_fmtdesc *fmt)
675 {
676 struct uvc_fh *handle = fh;
677 struct uvc_streaming *stream = handle->stream;
678
679 return uvc_ioctl_enum_fmt(stream, fmt);
680 }
681
uvc_ioctl_g_fmt_vid_cap(struct file * file,void * fh,struct v4l2_format * fmt)682 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
683 struct v4l2_format *fmt)
684 {
685 struct uvc_fh *handle = fh;
686 struct uvc_streaming *stream = handle->stream;
687
688 return uvc_v4l2_get_format(stream, fmt);
689 }
690
uvc_ioctl_g_fmt_vid_out(struct file * file,void * fh,struct v4l2_format * fmt)691 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
692 struct v4l2_format *fmt)
693 {
694 struct uvc_fh *handle = fh;
695 struct uvc_streaming *stream = handle->stream;
696
697 return uvc_v4l2_get_format(stream, fmt);
698 }
699
uvc_ioctl_s_fmt_vid_cap(struct file * file,void * fh,struct v4l2_format * fmt)700 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
701 struct v4l2_format *fmt)
702 {
703 struct uvc_fh *handle = fh;
704 struct uvc_streaming *stream = handle->stream;
705 int ret;
706
707 ret = uvc_acquire_privileges(handle);
708 if (ret < 0)
709 return ret;
710
711 return uvc_v4l2_set_format(stream, fmt);
712 }
713
uvc_ioctl_s_fmt_vid_out(struct file * file,void * fh,struct v4l2_format * fmt)714 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
715 struct v4l2_format *fmt)
716 {
717 struct uvc_fh *handle = fh;
718 struct uvc_streaming *stream = handle->stream;
719 int ret;
720
721 ret = uvc_acquire_privileges(handle);
722 if (ret < 0)
723 return ret;
724
725 return uvc_v4l2_set_format(stream, fmt);
726 }
727
uvc_ioctl_try_fmt_vid_cap(struct file * file,void * fh,struct v4l2_format * fmt)728 static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
729 struct v4l2_format *fmt)
730 {
731 struct uvc_fh *handle = fh;
732 struct uvc_streaming *stream = handle->stream;
733 struct uvc_streaming_control probe;
734
735 return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
736 }
737
uvc_ioctl_try_fmt_vid_out(struct file * file,void * fh,struct v4l2_format * fmt)738 static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
739 struct v4l2_format *fmt)
740 {
741 struct uvc_fh *handle = fh;
742 struct uvc_streaming *stream = handle->stream;
743 struct uvc_streaming_control probe;
744
745 return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
746 }
747
uvc_ioctl_reqbufs(struct file * file,void * fh,struct v4l2_requestbuffers * rb)748 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
749 struct v4l2_requestbuffers *rb)
750 {
751 struct uvc_fh *handle = fh;
752 struct uvc_streaming *stream = handle->stream;
753 int ret;
754
755 ret = uvc_acquire_privileges(handle);
756 if (ret < 0)
757 return ret;
758
759 mutex_lock(&stream->mutex);
760 ret = uvc_request_buffers(&stream->queue, rb);
761 mutex_unlock(&stream->mutex);
762 if (ret < 0)
763 return ret;
764
765 if (ret == 0)
766 uvc_dismiss_privileges(handle);
767
768 return 0;
769 }
770
uvc_ioctl_querybuf(struct file * file,void * fh,struct v4l2_buffer * buf)771 static int uvc_ioctl_querybuf(struct file *file, void *fh,
772 struct v4l2_buffer *buf)
773 {
774 struct uvc_fh *handle = fh;
775 struct uvc_streaming *stream = handle->stream;
776
777 if (!uvc_has_privileges(handle))
778 return -EBUSY;
779
780 return uvc_query_buffer(&stream->queue, buf);
781 }
782
uvc_ioctl_qbuf(struct file * file,void * fh,struct v4l2_buffer * buf)783 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
784 {
785 struct uvc_fh *handle = fh;
786 struct uvc_streaming *stream = handle->stream;
787
788 if (!uvc_has_privileges(handle))
789 return -EBUSY;
790
791 return uvc_queue_buffer(&stream->queue,
792 stream->vdev.v4l2_dev->mdev, buf);
793 }
794
uvc_ioctl_expbuf(struct file * file,void * fh,struct v4l2_exportbuffer * exp)795 static int uvc_ioctl_expbuf(struct file *file, void *fh,
796 struct v4l2_exportbuffer *exp)
797 {
798 struct uvc_fh *handle = fh;
799 struct uvc_streaming *stream = handle->stream;
800
801 if (!uvc_has_privileges(handle))
802 return -EBUSY;
803
804 return uvc_export_buffer(&stream->queue, exp);
805 }
806
uvc_ioctl_dqbuf(struct file * file,void * fh,struct v4l2_buffer * buf)807 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
808 {
809 struct uvc_fh *handle = fh;
810 struct uvc_streaming *stream = handle->stream;
811
812 if (!uvc_has_privileges(handle))
813 return -EBUSY;
814
815 return uvc_dequeue_buffer(&stream->queue, buf,
816 file->f_flags & O_NONBLOCK);
817 }
818
uvc_ioctl_create_bufs(struct file * file,void * fh,struct v4l2_create_buffers * cb)819 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
820 struct v4l2_create_buffers *cb)
821 {
822 struct uvc_fh *handle = fh;
823 struct uvc_streaming *stream = handle->stream;
824 int ret;
825
826 ret = uvc_acquire_privileges(handle);
827 if (ret < 0)
828 return ret;
829
830 return uvc_create_buffers(&stream->queue, cb);
831 }
832
uvc_ioctl_streamon(struct file * file,void * fh,enum v4l2_buf_type type)833 static int uvc_ioctl_streamon(struct file *file, void *fh,
834 enum v4l2_buf_type type)
835 {
836 struct uvc_fh *handle = fh;
837 struct uvc_streaming *stream = handle->stream;
838 int ret;
839
840 if (!uvc_has_privileges(handle))
841 return -EBUSY;
842
843 mutex_lock(&stream->mutex);
844 ret = uvc_queue_streamon(&stream->queue, type);
845 mutex_unlock(&stream->mutex);
846
847 return ret;
848 }
849
uvc_ioctl_streamoff(struct file * file,void * fh,enum v4l2_buf_type type)850 static int uvc_ioctl_streamoff(struct file *file, void *fh,
851 enum v4l2_buf_type type)
852 {
853 struct uvc_fh *handle = fh;
854 struct uvc_streaming *stream = handle->stream;
855
856 if (!uvc_has_privileges(handle))
857 return -EBUSY;
858
859 mutex_lock(&stream->mutex);
860 uvc_queue_streamoff(&stream->queue, type);
861 mutex_unlock(&stream->mutex);
862
863 return 0;
864 }
865
uvc_ioctl_enum_input(struct file * file,void * fh,struct v4l2_input * input)866 static int uvc_ioctl_enum_input(struct file *file, void *fh,
867 struct v4l2_input *input)
868 {
869 struct uvc_fh *handle = fh;
870 struct uvc_video_chain *chain = handle->chain;
871 const struct uvc_entity *selector = chain->selector;
872 struct uvc_entity *iterm = NULL;
873 struct uvc_entity *it;
874 u32 index = input->index;
875
876 if (selector == NULL ||
877 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
878 if (index != 0)
879 return -EINVAL;
880 list_for_each_entry(it, &chain->entities, chain) {
881 if (UVC_ENTITY_IS_ITERM(it)) {
882 iterm = it;
883 break;
884 }
885 }
886 } else if (index < selector->bNrInPins) {
887 list_for_each_entry(it, &chain->entities, chain) {
888 if (!UVC_ENTITY_IS_ITERM(it))
889 continue;
890 if (it->id == selector->baSourceID[index]) {
891 iterm = it;
892 break;
893 }
894 }
895 }
896
897 if (iterm == NULL)
898 return -EINVAL;
899
900 memset(input, 0, sizeof(*input));
901 input->index = index;
902 strscpy(input->name, iterm->name, sizeof(input->name));
903 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
904 input->type = V4L2_INPUT_TYPE_CAMERA;
905
906 return 0;
907 }
908
uvc_ioctl_g_input(struct file * file,void * fh,unsigned int * input)909 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
910 {
911 struct uvc_fh *handle = fh;
912 struct uvc_video_chain *chain = handle->chain;
913 u8 *buf;
914 int ret;
915
916 if (chain->selector == NULL ||
917 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
918 *input = 0;
919 return 0;
920 }
921
922 buf = kmalloc(1, GFP_KERNEL);
923 if (!buf)
924 return -ENOMEM;
925
926 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
927 chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
928 buf, 1);
929 if (!ret)
930 *input = *buf - 1;
931
932 kfree(buf);
933
934 return ret;
935 }
936
uvc_ioctl_s_input(struct file * file,void * fh,unsigned int input)937 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
938 {
939 struct uvc_fh *handle = fh;
940 struct uvc_video_chain *chain = handle->chain;
941 u8 *buf;
942 int ret;
943
944 ret = uvc_acquire_privileges(handle);
945 if (ret < 0)
946 return ret;
947
948 if (chain->selector == NULL ||
949 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
950 if (input)
951 return -EINVAL;
952 return 0;
953 }
954
955 if (input >= chain->selector->bNrInPins)
956 return -EINVAL;
957
958 buf = kmalloc(1, GFP_KERNEL);
959 if (!buf)
960 return -ENOMEM;
961
962 *buf = input + 1;
963 ret = uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
964 chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
965 buf, 1);
966 kfree(buf);
967
968 return ret;
969 }
970
uvc_ioctl_queryctrl(struct file * file,void * fh,struct v4l2_queryctrl * qc)971 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
972 struct v4l2_queryctrl *qc)
973 {
974 struct uvc_fh *handle = fh;
975 struct uvc_video_chain *chain = handle->chain;
976
977 return uvc_query_v4l2_ctrl(chain, qc);
978 }
979
uvc_ioctl_query_ext_ctrl(struct file * file,void * fh,struct v4l2_query_ext_ctrl * qec)980 static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
981 struct v4l2_query_ext_ctrl *qec)
982 {
983 struct uvc_fh *handle = fh;
984 struct uvc_video_chain *chain = handle->chain;
985 struct v4l2_queryctrl qc = { qec->id };
986 int ret;
987
988 ret = uvc_query_v4l2_ctrl(chain, &qc);
989 if (ret)
990 return ret;
991
992 qec->id = qc.id;
993 qec->type = qc.type;
994 strscpy(qec->name, qc.name, sizeof(qec->name));
995 qec->minimum = qc.minimum;
996 qec->maximum = qc.maximum;
997 qec->step = qc.step;
998 qec->default_value = qc.default_value;
999 qec->flags = qc.flags;
1000 qec->elem_size = 4;
1001 qec->elems = 1;
1002 qec->nr_of_dims = 0;
1003 memset(qec->dims, 0, sizeof(qec->dims));
1004 memset(qec->reserved, 0, sizeof(qec->reserved));
1005
1006 return 0;
1007 }
1008
uvc_ctrl_check_access(struct uvc_video_chain * chain,struct v4l2_ext_controls * ctrls,unsigned long ioctl)1009 static int uvc_ctrl_check_access(struct uvc_video_chain *chain,
1010 struct v4l2_ext_controls *ctrls,
1011 unsigned long ioctl)
1012 {
1013 struct v4l2_ext_control *ctrl = ctrls->controls;
1014 unsigned int i;
1015 int ret = 0;
1016
1017 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1018 ret = uvc_ctrl_is_accessible(chain, ctrl->id, ctrls, ioctl);
1019 if (ret)
1020 break;
1021 }
1022
1023 ctrls->error_idx = ioctl == VIDIOC_TRY_EXT_CTRLS ? i : ctrls->count;
1024
1025 return ret;
1026 }
1027
uvc_ioctl_g_ext_ctrls(struct file * file,void * fh,struct v4l2_ext_controls * ctrls)1028 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
1029 struct v4l2_ext_controls *ctrls)
1030 {
1031 struct uvc_fh *handle = fh;
1032 struct uvc_video_chain *chain = handle->chain;
1033 struct v4l2_ext_control *ctrl = ctrls->controls;
1034 unsigned int i;
1035 int ret;
1036
1037 ret = uvc_ctrl_check_access(chain, ctrls, VIDIOC_G_EXT_CTRLS);
1038 if (ret < 0)
1039 return ret;
1040
1041 if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
1042 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1043 struct v4l2_queryctrl qc = { .id = ctrl->id };
1044
1045 ret = uvc_query_v4l2_ctrl(chain, &qc);
1046 if (ret < 0) {
1047 ctrls->error_idx = i;
1048 return ret;
1049 }
1050
1051 ctrl->value = qc.default_value;
1052 }
1053
1054 return 0;
1055 }
1056
1057 ret = uvc_ctrl_begin(chain);
1058 if (ret < 0)
1059 return ret;
1060
1061 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1062 ret = uvc_ctrl_get(chain, ctrl);
1063 if (ret < 0) {
1064 uvc_ctrl_rollback(handle);
1065 ctrls->error_idx = i;
1066 return ret;
1067 }
1068 }
1069
1070 ctrls->error_idx = 0;
1071
1072 return uvc_ctrl_rollback(handle);
1073 }
1074
uvc_ioctl_s_try_ext_ctrls(struct uvc_fh * handle,struct v4l2_ext_controls * ctrls,unsigned long ioctl)1075 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1076 struct v4l2_ext_controls *ctrls,
1077 unsigned long ioctl)
1078 {
1079 struct v4l2_ext_control *ctrl = ctrls->controls;
1080 struct uvc_video_chain *chain = handle->chain;
1081 unsigned int i;
1082 int ret;
1083
1084 ret = uvc_ctrl_check_access(chain, ctrls, ioctl);
1085 if (ret < 0)
1086 return ret;
1087
1088 ret = uvc_ctrl_begin(chain);
1089 if (ret < 0)
1090 return ret;
1091
1092 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1093 ret = uvc_ctrl_set(handle, ctrl);
1094 if (ret < 0) {
1095 uvc_ctrl_rollback(handle);
1096 ctrls->error_idx = ioctl == VIDIOC_S_EXT_CTRLS ?
1097 ctrls->count : i;
1098 return ret;
1099 }
1100 }
1101
1102 ctrls->error_idx = 0;
1103
1104 if (ioctl == VIDIOC_S_EXT_CTRLS)
1105 return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
1106 else
1107 return uvc_ctrl_rollback(handle);
1108 }
1109
uvc_ioctl_s_ext_ctrls(struct file * file,void * fh,struct v4l2_ext_controls * ctrls)1110 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1111 struct v4l2_ext_controls *ctrls)
1112 {
1113 struct uvc_fh *handle = fh;
1114
1115 return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, VIDIOC_S_EXT_CTRLS);
1116 }
1117
uvc_ioctl_try_ext_ctrls(struct file * file,void * fh,struct v4l2_ext_controls * ctrls)1118 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1119 struct v4l2_ext_controls *ctrls)
1120 {
1121 struct uvc_fh *handle = fh;
1122
1123 return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, VIDIOC_TRY_EXT_CTRLS);
1124 }
1125
uvc_ioctl_querymenu(struct file * file,void * fh,struct v4l2_querymenu * qm)1126 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1127 struct v4l2_querymenu *qm)
1128 {
1129 struct uvc_fh *handle = fh;
1130 struct uvc_video_chain *chain = handle->chain;
1131
1132 return uvc_query_v4l2_menu(chain, qm);
1133 }
1134
uvc_ioctl_g_selection(struct file * file,void * fh,struct v4l2_selection * sel)1135 static int uvc_ioctl_g_selection(struct file *file, void *fh,
1136 struct v4l2_selection *sel)
1137 {
1138 struct uvc_fh *handle = fh;
1139 struct uvc_streaming *stream = handle->stream;
1140
1141 if (sel->type != stream->type)
1142 return -EINVAL;
1143
1144 switch (sel->target) {
1145 case V4L2_SEL_TGT_CROP_DEFAULT:
1146 case V4L2_SEL_TGT_CROP_BOUNDS:
1147 if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1148 return -EINVAL;
1149 break;
1150 case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1151 case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1152 if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1153 return -EINVAL;
1154 break;
1155 default:
1156 return -EINVAL;
1157 }
1158
1159 sel->r.left = 0;
1160 sel->r.top = 0;
1161 mutex_lock(&stream->mutex);
1162 sel->r.width = stream->cur_frame->wWidth;
1163 sel->r.height = stream->cur_frame->wHeight;
1164 mutex_unlock(&stream->mutex);
1165
1166 return 0;
1167 }
1168
uvc_ioctl_g_parm(struct file * file,void * fh,struct v4l2_streamparm * parm)1169 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1170 struct v4l2_streamparm *parm)
1171 {
1172 struct uvc_fh *handle = fh;
1173 struct uvc_streaming *stream = handle->stream;
1174
1175 return uvc_v4l2_get_streamparm(stream, parm);
1176 }
1177
uvc_ioctl_s_parm(struct file * file,void * fh,struct v4l2_streamparm * parm)1178 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1179 struct v4l2_streamparm *parm)
1180 {
1181 struct uvc_fh *handle = fh;
1182 struct uvc_streaming *stream = handle->stream;
1183 int ret;
1184
1185 ret = uvc_acquire_privileges(handle);
1186 if (ret < 0)
1187 return ret;
1188
1189 return uvc_v4l2_set_streamparm(stream, parm);
1190 }
1191
uvc_ioctl_enum_framesizes(struct file * file,void * fh,struct v4l2_frmsizeenum * fsize)1192 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1193 struct v4l2_frmsizeenum *fsize)
1194 {
1195 struct uvc_fh *handle = fh;
1196 struct uvc_streaming *stream = handle->stream;
1197 struct uvc_format *format = NULL;
1198 struct uvc_frame *frame = NULL;
1199 unsigned int index;
1200 unsigned int i;
1201
1202 /* Look for the given pixel format */
1203 for (i = 0; i < stream->nformats; i++) {
1204 if (stream->format[i].fcc == fsize->pixel_format) {
1205 format = &stream->format[i];
1206 break;
1207 }
1208 }
1209 if (format == NULL)
1210 return -EINVAL;
1211
1212 /* Skip duplicate frame sizes */
1213 for (i = 0, index = 0; i < format->nframes; i++) {
1214 if (frame && frame->wWidth == format->frame[i].wWidth &&
1215 frame->wHeight == format->frame[i].wHeight)
1216 continue;
1217 frame = &format->frame[i];
1218 if (index == fsize->index)
1219 break;
1220 index++;
1221 }
1222
1223 if (i == format->nframes)
1224 return -EINVAL;
1225
1226 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1227 fsize->discrete.width = frame->wWidth;
1228 fsize->discrete.height = frame->wHeight;
1229 return 0;
1230 }
1231
uvc_ioctl_enum_frameintervals(struct file * file,void * fh,struct v4l2_frmivalenum * fival)1232 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1233 struct v4l2_frmivalenum *fival)
1234 {
1235 struct uvc_fh *handle = fh;
1236 struct uvc_streaming *stream = handle->stream;
1237 struct uvc_format *format = NULL;
1238 struct uvc_frame *frame = NULL;
1239 unsigned int nintervals;
1240 unsigned int index;
1241 unsigned int i;
1242
1243 /* Look for the given pixel format and frame size */
1244 for (i = 0; i < stream->nformats; i++) {
1245 if (stream->format[i].fcc == fival->pixel_format) {
1246 format = &stream->format[i];
1247 break;
1248 }
1249 }
1250 if (format == NULL)
1251 return -EINVAL;
1252
1253 index = fival->index;
1254 for (i = 0; i < format->nframes; i++) {
1255 if (format->frame[i].wWidth == fival->width &&
1256 format->frame[i].wHeight == fival->height) {
1257 frame = &format->frame[i];
1258 nintervals = frame->bFrameIntervalType ?: 1;
1259 if (index < nintervals)
1260 break;
1261 index -= nintervals;
1262 }
1263 }
1264 if (i == format->nframes)
1265 return -EINVAL;
1266
1267 if (frame->bFrameIntervalType) {
1268 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1269 fival->discrete.numerator =
1270 frame->dwFrameInterval[index];
1271 fival->discrete.denominator = 10000000;
1272 v4l2_simplify_fraction(&fival->discrete.numerator,
1273 &fival->discrete.denominator, 8, 333);
1274 } else {
1275 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1276 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1277 fival->stepwise.min.denominator = 10000000;
1278 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1279 fival->stepwise.max.denominator = 10000000;
1280 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1281 fival->stepwise.step.denominator = 10000000;
1282 v4l2_simplify_fraction(&fival->stepwise.min.numerator,
1283 &fival->stepwise.min.denominator, 8, 333);
1284 v4l2_simplify_fraction(&fival->stepwise.max.numerator,
1285 &fival->stepwise.max.denominator, 8, 333);
1286 v4l2_simplify_fraction(&fival->stepwise.step.numerator,
1287 &fival->stepwise.step.denominator, 8, 333);
1288 }
1289
1290 return 0;
1291 }
1292
uvc_ioctl_subscribe_event(struct v4l2_fh * fh,const struct v4l2_event_subscription * sub)1293 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1294 const struct v4l2_event_subscription *sub)
1295 {
1296 switch (sub->type) {
1297 case V4L2_EVENT_CTRL:
1298 return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1299 default:
1300 return -EINVAL;
1301 }
1302 }
1303
uvc_ioctl_default(struct file * file,void * fh,bool valid_prio,unsigned int cmd,void * arg)1304 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1305 unsigned int cmd, void *arg)
1306 {
1307 struct uvc_fh *handle = fh;
1308 struct uvc_video_chain *chain = handle->chain;
1309
1310 switch (cmd) {
1311 /* Dynamic controls. */
1312 case UVCIOC_CTRL_MAP:
1313 return uvc_ioctl_ctrl_map(chain, arg);
1314
1315 case UVCIOC_CTRL_QUERY:
1316 return uvc_xu_ctrl_query(chain, arg);
1317
1318 default:
1319 return -ENOTTY;
1320 }
1321 }
1322
1323 #ifdef CONFIG_COMPAT
1324 struct uvc_xu_control_mapping32 {
1325 u32 id;
1326 u8 name[32];
1327 u8 entity[16];
1328 u8 selector;
1329
1330 u8 size;
1331 u8 offset;
1332 u32 v4l2_type;
1333 u32 data_type;
1334
1335 compat_caddr_t menu_info;
1336 u32 menu_count;
1337
1338 u32 reserved[4];
1339 };
1340
uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping * kp,const struct uvc_xu_control_mapping32 __user * up)1341 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1342 const struct uvc_xu_control_mapping32 __user *up)
1343 {
1344 struct uvc_xu_control_mapping32 *p = (void *)kp;
1345 compat_caddr_t info;
1346 u32 count;
1347
1348 if (copy_from_user(p, up, sizeof(*p)))
1349 return -EFAULT;
1350
1351 count = p->menu_count;
1352 info = p->menu_info;
1353
1354 memset(kp->reserved, 0, sizeof(kp->reserved));
1355 kp->menu_info = count ? compat_ptr(info) : NULL;
1356 kp->menu_count = count;
1357 return 0;
1358 }
1359
uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping * kp,struct uvc_xu_control_mapping32 __user * up)1360 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1361 struct uvc_xu_control_mapping32 __user *up)
1362 {
1363 if (copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1364 put_user(kp->menu_count, &up->menu_count))
1365 return -EFAULT;
1366
1367 if (clear_user(up->reserved, sizeof(up->reserved)))
1368 return -EFAULT;
1369
1370 return 0;
1371 }
1372
1373 struct uvc_xu_control_query32 {
1374 u8 unit;
1375 u8 selector;
1376 u8 query;
1377 u16 size;
1378 compat_caddr_t data;
1379 };
1380
uvc_v4l2_get_xu_query(struct uvc_xu_control_query * kp,const struct uvc_xu_control_query32 __user * up)1381 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1382 const struct uvc_xu_control_query32 __user *up)
1383 {
1384 struct uvc_xu_control_query32 v;
1385
1386 if (copy_from_user(&v, up, sizeof(v)))
1387 return -EFAULT;
1388
1389 *kp = (struct uvc_xu_control_query){
1390 .unit = v.unit,
1391 .selector = v.selector,
1392 .query = v.query,
1393 .size = v.size,
1394 .data = v.size ? compat_ptr(v.data) : NULL
1395 };
1396 return 0;
1397 }
1398
uvc_v4l2_put_xu_query(const struct uvc_xu_control_query * kp,struct uvc_xu_control_query32 __user * up)1399 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1400 struct uvc_xu_control_query32 __user *up)
1401 {
1402 if (copy_to_user(up, kp, offsetof(typeof(*up), data)))
1403 return -EFAULT;
1404 return 0;
1405 }
1406
1407 #define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1408 #define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32)
1409
uvc_v4l2_compat_ioctl32(struct file * file,unsigned int cmd,unsigned long arg)1410 static long uvc_v4l2_compat_ioctl32(struct file *file,
1411 unsigned int cmd, unsigned long arg)
1412 {
1413 struct uvc_fh *handle = file->private_data;
1414 union {
1415 struct uvc_xu_control_mapping xmap;
1416 struct uvc_xu_control_query xqry;
1417 } karg;
1418 void __user *up = compat_ptr(arg);
1419 long ret;
1420
1421 switch (cmd) {
1422 case UVCIOC_CTRL_MAP32:
1423 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1424 if (ret)
1425 return ret;
1426 ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
1427 if (ret)
1428 return ret;
1429 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1430 if (ret)
1431 return ret;
1432
1433 break;
1434
1435 case UVCIOC_CTRL_QUERY32:
1436 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1437 if (ret)
1438 return ret;
1439 ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
1440 if (ret)
1441 return ret;
1442 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1443 if (ret)
1444 return ret;
1445 break;
1446
1447 default:
1448 return -ENOIOCTLCMD;
1449 }
1450
1451 return ret;
1452 }
1453 #endif
1454
uvc_v4l2_read(struct file * file,char __user * data,size_t count,loff_t * ppos)1455 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1456 size_t count, loff_t *ppos)
1457 {
1458 struct uvc_fh *handle = file->private_data;
1459 struct uvc_streaming *stream = handle->stream;
1460
1461 uvc_dbg(stream->dev, CALLS, "%s: not implemented\n", __func__);
1462 return -EINVAL;
1463 }
1464
uvc_v4l2_mmap(struct file * file,struct vm_area_struct * vma)1465 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1466 {
1467 struct uvc_fh *handle = file->private_data;
1468 struct uvc_streaming *stream = handle->stream;
1469
1470 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
1471
1472 return uvc_queue_mmap(&stream->queue, vma);
1473 }
1474
uvc_v4l2_poll(struct file * file,poll_table * wait)1475 static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
1476 {
1477 struct uvc_fh *handle = file->private_data;
1478 struct uvc_streaming *stream = handle->stream;
1479
1480 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
1481
1482 return uvc_queue_poll(&stream->queue, file, wait);
1483 }
1484
1485 #ifndef CONFIG_MMU
uvc_v4l2_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)1486 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1487 unsigned long addr, unsigned long len, unsigned long pgoff,
1488 unsigned long flags)
1489 {
1490 struct uvc_fh *handle = file->private_data;
1491 struct uvc_streaming *stream = handle->stream;
1492
1493 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
1494
1495 return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1496 }
1497 #endif
1498
1499 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1500 .vidioc_querycap = uvc_ioctl_querycap,
1501 .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1502 .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1503 .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1504 .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1505 .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1506 .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1507 .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1508 .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1509 .vidioc_reqbufs = uvc_ioctl_reqbufs,
1510 .vidioc_querybuf = uvc_ioctl_querybuf,
1511 .vidioc_qbuf = uvc_ioctl_qbuf,
1512 .vidioc_expbuf = uvc_ioctl_expbuf,
1513 .vidioc_dqbuf = uvc_ioctl_dqbuf,
1514 .vidioc_create_bufs = uvc_ioctl_create_bufs,
1515 .vidioc_streamon = uvc_ioctl_streamon,
1516 .vidioc_streamoff = uvc_ioctl_streamoff,
1517 .vidioc_enum_input = uvc_ioctl_enum_input,
1518 .vidioc_g_input = uvc_ioctl_g_input,
1519 .vidioc_s_input = uvc_ioctl_s_input,
1520 .vidioc_queryctrl = uvc_ioctl_queryctrl,
1521 .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_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
1552