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/bits.h>
10#include <linux/compat.h>
11#include <linux/kernel.h>
12#include <linux/list.h>
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/usb.h>
16#include <linux/videodev2.h>
17#include <linux/vmalloc.h>
18#include <linux/mm.h>
19#include <linux/wait.h>
20#include <linux/atomic.h>
21
22#include <media/v4l2-common.h>
23#include <media/v4l2-ctrls.h>
24#include <media/v4l2-event.h>
25#include <media/v4l2-ioctl.h>
26
27#include "uvcvideo.h"
28
29static int uvc_control_add_xu_mapping(struct uvc_video_chain *chain,
30 struct uvc_control_mapping *map,
31 const struct uvc_xu_control_mapping *xmap)
32{
33 unsigned int i;
34 size_t size;
35 int ret;
36
37 /*
38 * Prevent excessive memory consumption, as well as integer
39 * overflows.
40 */
41 if (xmap->menu_count == 0 ||
42 xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES)
43 return -EINVAL;
44
45 map->menu_names = NULL;
46 map->menu_mapping = NULL;
47
48 map->menu_mask = GENMASK(xmap->menu_count - 1, 0);
49
50 size = xmap->menu_count * sizeof(*map->menu_mapping);
51 map->menu_mapping = kzalloc(size, GFP_KERNEL);
52 if (!map->menu_mapping) {
53 ret = -ENOMEM;
54 goto done;
55 }
56
57 for (i = 0; i < xmap->menu_count ; i++) {
58 if (copy_from_user(to: (u32 *)&map->menu_mapping[i],
59 from: &xmap->menu_info[i].value,
60 n: sizeof(map->menu_mapping[i]))) {
61 ret = -EACCES;
62 goto done;
63 }
64 }
65
66 /*
67 * Always use the standard naming if available, otherwise copy the
68 * names supplied by userspace.
69 */
70 if (!v4l2_ctrl_get_menu(id: map->id)) {
71 size = xmap->menu_count * sizeof(map->menu_names[0]);
72 map->menu_names = kzalloc(size, GFP_KERNEL);
73 if (!map->menu_names) {
74 ret = -ENOMEM;
75 goto done;
76 }
77
78 for (i = 0; i < xmap->menu_count ; i++) {
79 /* sizeof(names[i]) - 1: to take care of \0 */
80 if (copy_from_user(to: (char *)map->menu_names[i],
81 from: xmap->menu_info[i].name,
82 n: sizeof(map->menu_names[i]) - 1)) {
83 ret = -EACCES;
84 goto done;
85 }
86 }
87 }
88
89 ret = uvc_ctrl_add_mapping(chain, mapping: map);
90
91done:
92 kfree(objp: map->menu_names);
93 map->menu_names = NULL;
94 kfree(objp: map->menu_mapping);
95 map->menu_mapping = NULL;
96
97 return ret;
98}
99
100/* ------------------------------------------------------------------------
101 * UVC ioctls
102 */
103static int uvc_ioctl_xu_ctrl_map(struct uvc_video_chain *chain,
104 struct uvc_xu_control_mapping *xmap)
105{
106 struct uvc_control_mapping *map;
107 int ret;
108
109 map = kzalloc(size: sizeof(*map), GFP_KERNEL);
110 if (map == NULL)
111 return -ENOMEM;
112
113 map->id = xmap->id;
114 /* Non standard control id. */
115 if (v4l2_ctrl_get_name(id: map->id) == NULL) {
116 if (xmap->name[0] == '\0') {
117 ret = -EINVAL;
118 goto free_map;
119 }
120 xmap->name[sizeof(xmap->name) - 1] = '\0';
121 map->name = xmap->name;
122 }
123 memcpy(map->entity, xmap->entity, sizeof(map->entity));
124 map->selector = xmap->selector;
125 map->size = xmap->size;
126 map->offset = xmap->offset;
127 map->v4l2_type = xmap->v4l2_type;
128 map->data_type = xmap->data_type;
129
130 switch (xmap->v4l2_type) {
131 case V4L2_CTRL_TYPE_INTEGER:
132 case V4L2_CTRL_TYPE_BOOLEAN:
133 case V4L2_CTRL_TYPE_BUTTON:
134 ret = uvc_ctrl_add_mapping(chain, mapping: map);
135 break;
136
137 case V4L2_CTRL_TYPE_MENU:
138 ret = uvc_control_add_xu_mapping(chain, map, xmap);
139 break;
140
141 default:
142 uvc_dbg(chain->dev, CONTROL,
143 "Unsupported V4L2 control type %u\n", xmap->v4l2_type);
144 ret = -ENOTTY;
145 break;
146 }
147
148free_map:
149 kfree(objp: map);
150
151 return ret;
152}
153
154/* ------------------------------------------------------------------------
155 * V4L2 interface
156 */
157
158/*
159 * Find the frame interval closest to the requested frame interval for the
160 * given frame format and size. This should be done by the device as part of
161 * the Video Probe and Commit negotiation, but some hardware don't implement
162 * that feature.
163 */
164static u32 uvc_try_frame_interval(const struct uvc_frame *frame, u32 interval)
165{
166 unsigned int i;
167
168 if (frame->bFrameIntervalType) {
169 u32 best = -1, dist;
170
171 for (i = 0; i < frame->bFrameIntervalType; ++i) {
172 dist = interval > frame->dwFrameInterval[i]
173 ? interval - frame->dwFrameInterval[i]
174 : frame->dwFrameInterval[i] - interval;
175
176 if (dist > best)
177 break;
178
179 best = dist;
180 }
181
182 interval = frame->dwFrameInterval[i-1];
183 } else {
184 const u32 min = frame->dwFrameInterval[0];
185 const u32 max = frame->dwFrameInterval[1];
186 const u32 step = frame->dwFrameInterval[2];
187
188 interval = min + (interval - min + step/2) / step * step;
189 if (interval > max)
190 interval = max;
191 }
192
193 return interval;
194}
195
196static u32 uvc_v4l2_get_bytesperline(const struct uvc_format *format,
197 const struct uvc_frame *frame)
198{
199 switch (format->fcc) {
200 case V4L2_PIX_FMT_NV12:
201 case V4L2_PIX_FMT_YVU420:
202 case V4L2_PIX_FMT_YUV420:
203 case V4L2_PIX_FMT_M420:
204 return frame->wWidth;
205
206 default:
207 return format->bpp * frame->wWidth / 8;
208 }
209}
210
211static int uvc_v4l2_try_format(struct uvc_streaming *stream,
212 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
213 const struct uvc_format **uvc_format,
214 const struct uvc_frame **uvc_frame)
215{
216 const struct uvc_format *format = NULL;
217 const struct uvc_frame *frame = NULL;
218 u16 rw, rh;
219 unsigned int d, maxd;
220 unsigned int i;
221 u32 interval;
222 int ret = 0;
223 u8 *fcc;
224
225 if (fmt->type != stream->type)
226 return -EINVAL;
227
228 fcc = (u8 *)&fmt->fmt.pix.pixelformat;
229 uvc_dbg(stream->dev, FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u\n",
230 fmt->fmt.pix.pixelformat,
231 fcc[0], fcc[1], fcc[2], fcc[3],
232 fmt->fmt.pix.width, fmt->fmt.pix.height);
233
234 /*
235 * Check if the hardware supports the requested format, use the default
236 * format otherwise.
237 */
238 for (i = 0; i < stream->nformats; ++i) {
239 format = &stream->formats[i];
240 if (format->fcc == fmt->fmt.pix.pixelformat)
241 break;
242 }
243
244 if (i == stream->nformats) {
245 format = stream->def_format;
246 fmt->fmt.pix.pixelformat = format->fcc;
247 }
248
249 /*
250 * Find the closest image size. The distance between image sizes is
251 * the size in pixels of the non-overlapping regions between the
252 * requested size and the frame-specified size.
253 */
254 rw = fmt->fmt.pix.width;
255 rh = fmt->fmt.pix.height;
256 maxd = (unsigned int)-1;
257
258 for (i = 0; i < format->nframes; ++i) {
259 u16 w = format->frames[i].wWidth;
260 u16 h = format->frames[i].wHeight;
261
262 d = min(w, rw) * min(h, rh);
263 d = w*h + rw*rh - 2*d;
264 if (d < maxd) {
265 maxd = d;
266 frame = &format->frames[i];
267 }
268
269 if (maxd == 0)
270 break;
271 }
272
273 if (frame == NULL) {
274 uvc_dbg(stream->dev, FORMAT, "Unsupported size %ux%u\n",
275 fmt->fmt.pix.width, fmt->fmt.pix.height);
276 return -EINVAL;
277 }
278
279 /* Use the default frame interval. */
280 interval = frame->dwDefaultFrameInterval;
281 uvc_dbg(stream->dev, FORMAT,
282 "Using default frame interval %u.%u us (%u.%u fps)\n",
283 interval / 10, interval % 10, 10000000 / interval,
284 (100000000 / interval) % 10);
285
286 /* Set the format index, frame index and frame interval. */
287 memset(probe, 0, sizeof(*probe));
288 probe->bmHint = 1; /* dwFrameInterval */
289 probe->bFormatIndex = format->index;
290 probe->bFrameIndex = frame->bFrameIndex;
291 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
292 /*
293 * Some webcams stall the probe control set request when the
294 * dwMaxVideoFrameSize field is set to zero. The UVC specification
295 * clearly states that the field is read-only from the host, so this
296 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
297 * the webcam to work around the problem.
298 *
299 * The workaround could probably be enabled for all webcams, so the
300 * quirk can be removed if needed. It's currently useful to detect
301 * webcam bugs and fix them before they hit the market (providing
302 * developers test their webcams with the Linux driver as well as with
303 * the Windows driver).
304 */
305 mutex_lock(&stream->mutex);
306 if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
307 probe->dwMaxVideoFrameSize =
308 stream->ctrl.dwMaxVideoFrameSize;
309
310 /* Probe the device. */
311 ret = uvc_probe_video(stream, probe);
312 mutex_unlock(lock: &stream->mutex);
313 if (ret < 0)
314 return ret;
315
316 /*
317 * After the probe, update fmt with the values returned from
318 * negotiation with the device. Some devices return invalid bFormatIndex
319 * and bFrameIndex values, in which case we can only assume they have
320 * accepted the requested format as-is.
321 */
322 for (i = 0; i < stream->nformats; ++i) {
323 if (probe->bFormatIndex == stream->formats[i].index) {
324 format = &stream->formats[i];
325 break;
326 }
327 }
328
329 if (i == stream->nformats)
330 uvc_dbg(stream->dev, FORMAT,
331 "Unknown bFormatIndex %u, using default\n",
332 probe->bFormatIndex);
333
334 for (i = 0; i < format->nframes; ++i) {
335 if (probe->bFrameIndex == format->frames[i].bFrameIndex) {
336 frame = &format->frames[i];
337 break;
338 }
339 }
340
341 if (i == format->nframes)
342 uvc_dbg(stream->dev, FORMAT,
343 "Unknown bFrameIndex %u, using default\n",
344 probe->bFrameIndex);
345
346 fmt->fmt.pix.width = frame->wWidth;
347 fmt->fmt.pix.height = frame->wHeight;
348 fmt->fmt.pix.field = V4L2_FIELD_NONE;
349 fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
350 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
351 fmt->fmt.pix.pixelformat = format->fcc;
352 fmt->fmt.pix.colorspace = format->colorspace;
353 fmt->fmt.pix.xfer_func = format->xfer_func;
354 fmt->fmt.pix.ycbcr_enc = format->ycbcr_enc;
355
356 if (uvc_format != NULL)
357 *uvc_format = format;
358 if (uvc_frame != NULL)
359 *uvc_frame = frame;
360
361 return ret;
362}
363
364static int uvc_v4l2_get_format(struct uvc_streaming *stream,
365 struct v4l2_format *fmt)
366{
367 const struct uvc_format *format;
368 const struct uvc_frame *frame;
369 int ret = 0;
370
371 if (fmt->type != stream->type)
372 return -EINVAL;
373
374 mutex_lock(&stream->mutex);
375 format = stream->cur_format;
376 frame = stream->cur_frame;
377
378 if (format == NULL || frame == NULL) {
379 ret = -EINVAL;
380 goto done;
381 }
382
383 fmt->fmt.pix.pixelformat = format->fcc;
384 fmt->fmt.pix.width = frame->wWidth;
385 fmt->fmt.pix.height = frame->wHeight;
386 fmt->fmt.pix.field = V4L2_FIELD_NONE;
387 fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
388 fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
389 fmt->fmt.pix.colorspace = format->colorspace;
390 fmt->fmt.pix.xfer_func = format->xfer_func;
391 fmt->fmt.pix.ycbcr_enc = format->ycbcr_enc;
392
393done:
394 mutex_unlock(lock: &stream->mutex);
395 return ret;
396}
397
398static int uvc_v4l2_set_format(struct uvc_streaming *stream,
399 struct v4l2_format *fmt)
400{
401 struct uvc_streaming_control probe;
402 const struct uvc_format *format;
403 const struct uvc_frame *frame;
404 int ret;
405
406 if (fmt->type != stream->type)
407 return -EINVAL;
408
409 ret = uvc_v4l2_try_format(stream, fmt, probe: &probe, uvc_format: &format, uvc_frame: &frame);
410 if (ret < 0)
411 return ret;
412
413 mutex_lock(&stream->mutex);
414
415 if (uvc_queue_allocated(queue: &stream->queue)) {
416 ret = -EBUSY;
417 goto done;
418 }
419
420 stream->ctrl = probe;
421 stream->cur_format = format;
422 stream->cur_frame = frame;
423
424done:
425 mutex_unlock(lock: &stream->mutex);
426 return ret;
427}
428
429static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
430 struct v4l2_streamparm *parm)
431{
432 u32 numerator, denominator;
433
434 if (parm->type != stream->type)
435 return -EINVAL;
436
437 mutex_lock(&stream->mutex);
438 numerator = stream->ctrl.dwFrameInterval;
439 mutex_unlock(lock: &stream->mutex);
440
441 denominator = 10000000;
442 v4l2_simplify_fraction(numerator: &numerator, denominator: &denominator, n_terms: 8, threshold: 333);
443
444 memset(parm, 0, sizeof(*parm));
445 parm->type = stream->type;
446
447 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
448 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
449 parm->parm.capture.capturemode = 0;
450 parm->parm.capture.timeperframe.numerator = numerator;
451 parm->parm.capture.timeperframe.denominator = denominator;
452 parm->parm.capture.extendedmode = 0;
453 parm->parm.capture.readbuffers = 0;
454 } else {
455 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
456 parm->parm.output.outputmode = 0;
457 parm->parm.output.timeperframe.numerator = numerator;
458 parm->parm.output.timeperframe.denominator = denominator;
459 }
460
461 return 0;
462}
463
464static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
465 struct v4l2_streamparm *parm)
466{
467 struct uvc_streaming_control probe;
468 struct v4l2_fract timeperframe;
469 const struct uvc_format *format;
470 const struct uvc_frame *frame;
471 u32 interval, maxd;
472 unsigned int i;
473 int ret;
474
475 if (parm->type != stream->type)
476 return -EINVAL;
477
478 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
479 timeperframe = parm->parm.capture.timeperframe;
480 else
481 timeperframe = parm->parm.output.timeperframe;
482
483 interval = v4l2_fraction_to_interval(numerator: timeperframe.numerator,
484 denominator: timeperframe.denominator);
485 uvc_dbg(stream->dev, FORMAT, "Setting frame interval to %u/%u (%u)\n",
486 timeperframe.numerator, timeperframe.denominator, interval);
487
488 mutex_lock(&stream->mutex);
489
490 if (uvc_queue_streaming(queue: &stream->queue)) {
491 mutex_unlock(lock: &stream->mutex);
492 return -EBUSY;
493 }
494
495 format = stream->cur_format;
496 frame = stream->cur_frame;
497 probe = stream->ctrl;
498 probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
499 maxd = abs((s32)probe.dwFrameInterval - interval);
500
501 /* Try frames with matching size to find the best frame interval. */
502 for (i = 0; i < format->nframes && maxd != 0; i++) {
503 u32 d, ival;
504
505 if (&format->frames[i] == stream->cur_frame)
506 continue;
507
508 if (format->frames[i].wWidth != stream->cur_frame->wWidth ||
509 format->frames[i].wHeight != stream->cur_frame->wHeight)
510 continue;
511
512 ival = uvc_try_frame_interval(frame: &format->frames[i], interval);
513 d = abs((s32)ival - interval);
514 if (d >= maxd)
515 continue;
516
517 frame = &format->frames[i];
518 probe.bFrameIndex = frame->bFrameIndex;
519 probe.dwFrameInterval = ival;
520 maxd = d;
521 }
522
523 /* Probe the device with the new settings. */
524 ret = uvc_probe_video(stream, probe: &probe);
525 if (ret < 0) {
526 mutex_unlock(lock: &stream->mutex);
527 return ret;
528 }
529
530 stream->ctrl = probe;
531 stream->cur_frame = frame;
532 mutex_unlock(lock: &stream->mutex);
533
534 /* Return the actual frame period. */
535 timeperframe.numerator = probe.dwFrameInterval;
536 timeperframe.denominator = 10000000;
537 v4l2_simplify_fraction(numerator: &timeperframe.numerator,
538 denominator: &timeperframe.denominator, n_terms: 8, threshold: 333);
539
540 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
541 parm->parm.capture.timeperframe = timeperframe;
542 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
543 } else {
544 parm->parm.output.timeperframe = timeperframe;
545 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
546 }
547
548 return 0;
549}
550
551/* ------------------------------------------------------------------------
552 * Privilege management
553 */
554
555/*
556 * Privilege management is the multiple-open implementation basis. The current
557 * implementation is completely transparent for the end-user and doesn't
558 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
559 * Those ioctls enable finer control on the device (by making possible for a
560 * user to request exclusive access to a device), but are not mature yet.
561 * Switching to the V4L2 priority mechanism might be considered in the future
562 * if this situation changes.
563 *
564 * Each open instance of a UVC device can either be in a privileged or
565 * unprivileged state. Only a single instance can be in a privileged state at
566 * a given time. Trying to perform an operation that requires privileges will
567 * automatically acquire the required privileges if possible, or return -EBUSY
568 * otherwise. Privileges are dismissed when closing the instance or when
569 * freeing the video buffers using VIDIOC_REQBUFS.
570 *
571 * Operations that require privileges are:
572 *
573 * - VIDIOC_S_INPUT
574 * - VIDIOC_S_PARM
575 * - VIDIOC_S_FMT
576 * - VIDIOC_REQBUFS
577 */
578static int uvc_acquire_privileges(struct uvc_fh *handle)
579{
580 /* Always succeed if the handle is already privileged. */
581 if (handle->state == UVC_HANDLE_ACTIVE)
582 return 0;
583
584 /* Check if the device already has a privileged handle. */
585 if (atomic_inc_return(v: &handle->stream->active) != 1) {
586 atomic_dec(v: &handle->stream->active);
587 return -EBUSY;
588 }
589
590 handle->state = UVC_HANDLE_ACTIVE;
591 return 0;
592}
593
594static void uvc_dismiss_privileges(struct uvc_fh *handle)
595{
596 if (handle->state == UVC_HANDLE_ACTIVE)
597 atomic_dec(v: &handle->stream->active);
598
599 handle->state = UVC_HANDLE_PASSIVE;
600}
601
602static int uvc_has_privileges(struct uvc_fh *handle)
603{
604 return handle->state == UVC_HANDLE_ACTIVE;
605}
606
607/* ------------------------------------------------------------------------
608 * V4L2 file operations
609 */
610
611static int uvc_v4l2_open(struct file *file)
612{
613 struct uvc_streaming *stream;
614 struct uvc_fh *handle;
615 int ret = 0;
616
617 stream = video_drvdata(file);
618 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
619
620 ret = usb_autopm_get_interface(intf: stream->dev->intf);
621 if (ret < 0)
622 return ret;
623
624 /* Create the device handle. */
625 handle = kzalloc(size: sizeof(*handle), GFP_KERNEL);
626 if (handle == NULL) {
627 usb_autopm_put_interface(intf: stream->dev->intf);
628 return -ENOMEM;
629 }
630
631 mutex_lock(&stream->dev->lock);
632 if (stream->dev->users == 0) {
633 ret = uvc_status_start(dev: stream->dev, GFP_KERNEL);
634 if (ret < 0) {
635 mutex_unlock(lock: &stream->dev->lock);
636 usb_autopm_put_interface(intf: stream->dev->intf);
637 kfree(objp: handle);
638 return ret;
639 }
640 }
641
642 stream->dev->users++;
643 mutex_unlock(lock: &stream->dev->lock);
644
645 v4l2_fh_init(fh: &handle->vfh, vdev: &stream->vdev);
646 v4l2_fh_add(fh: &handle->vfh);
647 handle->chain = stream->chain;
648 handle->stream = stream;
649 handle->state = UVC_HANDLE_PASSIVE;
650 file->private_data = handle;
651
652 return 0;
653}
654
655static int uvc_v4l2_release(struct file *file)
656{
657 struct uvc_fh *handle = file->private_data;
658 struct uvc_streaming *stream = handle->stream;
659
660 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
661
662 /* Only free resources if this is a privileged handle. */
663 if (uvc_has_privileges(handle))
664 uvc_queue_release(queue: &stream->queue);
665
666 /* Release the file handle. */
667 uvc_dismiss_privileges(handle);
668 v4l2_fh_del(fh: &handle->vfh);
669 v4l2_fh_exit(fh: &handle->vfh);
670 kfree(objp: handle);
671 file->private_data = NULL;
672
673 mutex_lock(&stream->dev->lock);
674 if (--stream->dev->users == 0)
675 uvc_status_stop(dev: stream->dev);
676 mutex_unlock(lock: &stream->dev->lock);
677
678 usb_autopm_put_interface(intf: stream->dev->intf);
679 return 0;
680}
681
682static int uvc_ioctl_querycap(struct file *file, void *fh,
683 struct v4l2_capability *cap)
684{
685 struct uvc_fh *handle = file->private_data;
686 struct uvc_video_chain *chain = handle->chain;
687 struct uvc_streaming *stream = handle->stream;
688
689 strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
690 strscpy(cap->card, handle->stream->dev->name, sizeof(cap->card));
691 usb_make_path(dev: stream->dev->udev, buf: cap->bus_info, size: sizeof(cap->bus_info));
692 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
693 | chain->caps;
694
695 return 0;
696}
697
698static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
699 struct v4l2_fmtdesc *fmt)
700{
701 const struct uvc_format *format;
702 enum v4l2_buf_type type = fmt->type;
703 u32 index = fmt->index;
704
705 if (fmt->type != stream->type || fmt->index >= stream->nformats)
706 return -EINVAL;
707
708 memset(fmt, 0, sizeof(*fmt));
709 fmt->index = index;
710 fmt->type = type;
711
712 format = &stream->formats[fmt->index];
713 fmt->flags = 0;
714 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
715 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
716 fmt->pixelformat = format->fcc;
717 return 0;
718}
719
720static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
721 struct v4l2_fmtdesc *fmt)
722{
723 struct uvc_fh *handle = fh;
724 struct uvc_streaming *stream = handle->stream;
725
726 return uvc_ioctl_enum_fmt(stream, fmt);
727}
728
729static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
730 struct v4l2_fmtdesc *fmt)
731{
732 struct uvc_fh *handle = fh;
733 struct uvc_streaming *stream = handle->stream;
734
735 return uvc_ioctl_enum_fmt(stream, fmt);
736}
737
738static int uvc_ioctl_g_fmt_vid_cap(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
744 return uvc_v4l2_get_format(stream, fmt);
745}
746
747static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
748 struct v4l2_format *fmt)
749{
750 struct uvc_fh *handle = fh;
751 struct uvc_streaming *stream = handle->stream;
752
753 return uvc_v4l2_get_format(stream, fmt);
754}
755
756static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
757 struct v4l2_format *fmt)
758{
759 struct uvc_fh *handle = fh;
760 struct uvc_streaming *stream = handle->stream;
761 int ret;
762
763 ret = uvc_acquire_privileges(handle);
764 if (ret < 0)
765 return ret;
766
767 return uvc_v4l2_set_format(stream, fmt);
768}
769
770static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
771 struct v4l2_format *fmt)
772{
773 struct uvc_fh *handle = fh;
774 struct uvc_streaming *stream = handle->stream;
775 int ret;
776
777 ret = uvc_acquire_privileges(handle);
778 if (ret < 0)
779 return ret;
780
781 return uvc_v4l2_set_format(stream, fmt);
782}
783
784static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
785 struct v4l2_format *fmt)
786{
787 struct uvc_fh *handle = fh;
788 struct uvc_streaming *stream = handle->stream;
789 struct uvc_streaming_control probe;
790
791 return uvc_v4l2_try_format(stream, fmt, probe: &probe, NULL, NULL);
792}
793
794static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
795 struct v4l2_format *fmt)
796{
797 struct uvc_fh *handle = fh;
798 struct uvc_streaming *stream = handle->stream;
799 struct uvc_streaming_control probe;
800
801 return uvc_v4l2_try_format(stream, fmt, probe: &probe, NULL, NULL);
802}
803
804static int uvc_ioctl_reqbufs(struct file *file, void *fh,
805 struct v4l2_requestbuffers *rb)
806{
807 struct uvc_fh *handle = fh;
808 struct uvc_streaming *stream = handle->stream;
809 int ret;
810
811 ret = uvc_acquire_privileges(handle);
812 if (ret < 0)
813 return ret;
814
815 mutex_lock(&stream->mutex);
816 ret = uvc_request_buffers(queue: &stream->queue, rb);
817 mutex_unlock(lock: &stream->mutex);
818 if (ret < 0)
819 return ret;
820
821 if (ret == 0)
822 uvc_dismiss_privileges(handle);
823
824 return 0;
825}
826
827static int uvc_ioctl_querybuf(struct file *file, void *fh,
828 struct v4l2_buffer *buf)
829{
830 struct uvc_fh *handle = fh;
831 struct uvc_streaming *stream = handle->stream;
832
833 if (!uvc_has_privileges(handle))
834 return -EBUSY;
835
836 return uvc_query_buffer(queue: &stream->queue, v4l2_buf: buf);
837}
838
839static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
840{
841 struct uvc_fh *handle = fh;
842 struct uvc_streaming *stream = handle->stream;
843
844 if (!uvc_has_privileges(handle))
845 return -EBUSY;
846
847 return uvc_queue_buffer(queue: &stream->queue,
848 mdev: stream->vdev.v4l2_dev->mdev, v4l2_buf: buf);
849}
850
851static int uvc_ioctl_expbuf(struct file *file, void *fh,
852 struct v4l2_exportbuffer *exp)
853{
854 struct uvc_fh *handle = fh;
855 struct uvc_streaming *stream = handle->stream;
856
857 if (!uvc_has_privileges(handle))
858 return -EBUSY;
859
860 return uvc_export_buffer(queue: &stream->queue, exp);
861}
862
863static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
864{
865 struct uvc_fh *handle = fh;
866 struct uvc_streaming *stream = handle->stream;
867
868 if (!uvc_has_privileges(handle))
869 return -EBUSY;
870
871 return uvc_dequeue_buffer(queue: &stream->queue, v4l2_buf: buf,
872 nonblocking: file->f_flags & O_NONBLOCK);
873}
874
875static int uvc_ioctl_create_bufs(struct file *file, void *fh,
876 struct v4l2_create_buffers *cb)
877{
878 struct uvc_fh *handle = fh;
879 struct uvc_streaming *stream = handle->stream;
880 int ret;
881
882 ret = uvc_acquire_privileges(handle);
883 if (ret < 0)
884 return ret;
885
886 return uvc_create_buffers(queue: &stream->queue, v4l2_cb: cb);
887}
888
889static int uvc_ioctl_streamon(struct file *file, void *fh,
890 enum v4l2_buf_type type)
891{
892 struct uvc_fh *handle = fh;
893 struct uvc_streaming *stream = handle->stream;
894 int ret;
895
896 if (!uvc_has_privileges(handle))
897 return -EBUSY;
898
899 mutex_lock(&stream->mutex);
900 ret = uvc_queue_streamon(queue: &stream->queue, type);
901 mutex_unlock(lock: &stream->mutex);
902
903 return ret;
904}
905
906static int uvc_ioctl_streamoff(struct file *file, void *fh,
907 enum v4l2_buf_type type)
908{
909 struct uvc_fh *handle = fh;
910 struct uvc_streaming *stream = handle->stream;
911
912 if (!uvc_has_privileges(handle))
913 return -EBUSY;
914
915 mutex_lock(&stream->mutex);
916 uvc_queue_streamoff(queue: &stream->queue, type);
917 mutex_unlock(lock: &stream->mutex);
918
919 return 0;
920}
921
922static int uvc_ioctl_enum_input(struct file *file, void *fh,
923 struct v4l2_input *input)
924{
925 struct uvc_fh *handle = fh;
926 struct uvc_video_chain *chain = handle->chain;
927 const struct uvc_entity *selector = chain->selector;
928 struct uvc_entity *iterm = NULL;
929 struct uvc_entity *it;
930 u32 index = input->index;
931
932 if (selector == NULL ||
933 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
934 if (index != 0)
935 return -EINVAL;
936 list_for_each_entry(it, &chain->entities, chain) {
937 if (UVC_ENTITY_IS_ITERM(it)) {
938 iterm = it;
939 break;
940 }
941 }
942 } else if (index < selector->bNrInPins) {
943 list_for_each_entry(it, &chain->entities, chain) {
944 if (!UVC_ENTITY_IS_ITERM(it))
945 continue;
946 if (it->id == selector->baSourceID[index]) {
947 iterm = it;
948 break;
949 }
950 }
951 }
952
953 if (iterm == NULL)
954 return -EINVAL;
955
956 memset(input, 0, sizeof(*input));
957 input->index = index;
958 strscpy(input->name, iterm->name, sizeof(input->name));
959 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
960 input->type = V4L2_INPUT_TYPE_CAMERA;
961
962 return 0;
963}
964
965static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
966{
967 struct uvc_fh *handle = fh;
968 struct uvc_video_chain *chain = handle->chain;
969 u8 *buf;
970 int ret;
971
972 if (chain->selector == NULL ||
973 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
974 *input = 0;
975 return 0;
976 }
977
978 buf = kmalloc(size: 1, GFP_KERNEL);
979 if (!buf)
980 return -ENOMEM;
981
982 ret = uvc_query_ctrl(dev: chain->dev, UVC_GET_CUR, unit: chain->selector->id,
983 intfnum: chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
984 data: buf, size: 1);
985 if (!ret)
986 *input = *buf - 1;
987
988 kfree(objp: buf);
989
990 return ret;
991}
992
993static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
994{
995 struct uvc_fh *handle = fh;
996 struct uvc_video_chain *chain = handle->chain;
997 u8 *buf;
998 int ret;
999
1000 ret = uvc_acquire_privileges(handle);
1001 if (ret < 0)
1002 return ret;
1003
1004 if (chain->selector == NULL ||
1005 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
1006 if (input)
1007 return -EINVAL;
1008 return 0;
1009 }
1010
1011 if (input >= chain->selector->bNrInPins)
1012 return -EINVAL;
1013
1014 buf = kmalloc(size: 1, GFP_KERNEL);
1015 if (!buf)
1016 return -ENOMEM;
1017
1018 *buf = input + 1;
1019 ret = uvc_query_ctrl(dev: chain->dev, UVC_SET_CUR, unit: chain->selector->id,
1020 intfnum: chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
1021 data: buf, size: 1);
1022 kfree(objp: buf);
1023
1024 return ret;
1025}
1026
1027static int uvc_ioctl_queryctrl(struct file *file, void *fh,
1028 struct v4l2_queryctrl *qc)
1029{
1030 struct uvc_fh *handle = fh;
1031 struct uvc_video_chain *chain = handle->chain;
1032
1033 return uvc_query_v4l2_ctrl(chain, v4l2_ctrl: qc);
1034}
1035
1036static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
1037 struct v4l2_query_ext_ctrl *qec)
1038{
1039 struct uvc_fh *handle = fh;
1040 struct uvc_video_chain *chain = handle->chain;
1041 struct v4l2_queryctrl qc = { qec->id };
1042 int ret;
1043
1044 ret = uvc_query_v4l2_ctrl(chain, v4l2_ctrl: &qc);
1045 if (ret)
1046 return ret;
1047
1048 qec->id = qc.id;
1049 qec->type = qc.type;
1050 strscpy(qec->name, qc.name, sizeof(qec->name));
1051 qec->minimum = qc.minimum;
1052 qec->maximum = qc.maximum;
1053 qec->step = qc.step;
1054 qec->default_value = qc.default_value;
1055 qec->flags = qc.flags;
1056 qec->elem_size = 4;
1057 qec->elems = 1;
1058 qec->nr_of_dims = 0;
1059 memset(qec->dims, 0, sizeof(qec->dims));
1060 memset(qec->reserved, 0, sizeof(qec->reserved));
1061
1062 return 0;
1063}
1064
1065static int uvc_ctrl_check_access(struct uvc_video_chain *chain,
1066 struct v4l2_ext_controls *ctrls,
1067 unsigned long ioctl)
1068{
1069 struct v4l2_ext_control *ctrl = ctrls->controls;
1070 unsigned int i;
1071 int ret = 0;
1072
1073 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1074 ret = uvc_ctrl_is_accessible(chain, v4l2_id: ctrl->id, ctrls, ioctl);
1075 if (ret)
1076 break;
1077 }
1078
1079 ctrls->error_idx = ioctl == VIDIOC_TRY_EXT_CTRLS ? i : ctrls->count;
1080
1081 return ret;
1082}
1083
1084static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
1085 struct v4l2_ext_controls *ctrls)
1086{
1087 struct uvc_fh *handle = fh;
1088 struct uvc_video_chain *chain = handle->chain;
1089 struct v4l2_ext_control *ctrl = ctrls->controls;
1090 unsigned int i;
1091 int ret;
1092
1093 ret = uvc_ctrl_check_access(chain, ctrls, VIDIOC_G_EXT_CTRLS);
1094 if (ret < 0)
1095 return ret;
1096
1097 if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
1098 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1099 struct v4l2_queryctrl qc = { .id = ctrl->id };
1100
1101 ret = uvc_query_v4l2_ctrl(chain, v4l2_ctrl: &qc);
1102 if (ret < 0) {
1103 ctrls->error_idx = i;
1104 return ret;
1105 }
1106
1107 ctrl->value = qc.default_value;
1108 }
1109
1110 return 0;
1111 }
1112
1113 ret = uvc_ctrl_begin(chain);
1114 if (ret < 0)
1115 return ret;
1116
1117 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1118 ret = uvc_ctrl_get(chain, xctrl: ctrl);
1119 if (ret < 0) {
1120 uvc_ctrl_rollback(handle);
1121 ctrls->error_idx = i;
1122 return ret;
1123 }
1124 }
1125
1126 ctrls->error_idx = 0;
1127
1128 return uvc_ctrl_rollback(handle);
1129}
1130
1131static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1132 struct v4l2_ext_controls *ctrls,
1133 unsigned long ioctl)
1134{
1135 struct v4l2_ext_control *ctrl = ctrls->controls;
1136 struct uvc_video_chain *chain = handle->chain;
1137 unsigned int i;
1138 int ret;
1139
1140 ret = uvc_ctrl_check_access(chain, ctrls, ioctl);
1141 if (ret < 0)
1142 return ret;
1143
1144 ret = uvc_ctrl_begin(chain);
1145 if (ret < 0)
1146 return ret;
1147
1148 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1149 ret = uvc_ctrl_set(handle, xctrl: ctrl);
1150 if (ret < 0) {
1151 uvc_ctrl_rollback(handle);
1152 ctrls->error_idx = ioctl == VIDIOC_S_EXT_CTRLS ?
1153 ctrls->count : i;
1154 return ret;
1155 }
1156 }
1157
1158 ctrls->error_idx = 0;
1159
1160 if (ioctl == VIDIOC_S_EXT_CTRLS)
1161 return uvc_ctrl_commit(handle, ctrls);
1162 else
1163 return uvc_ctrl_rollback(handle);
1164}
1165
1166static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1167 struct v4l2_ext_controls *ctrls)
1168{
1169 struct uvc_fh *handle = fh;
1170
1171 return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, VIDIOC_S_EXT_CTRLS);
1172}
1173
1174static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1175 struct v4l2_ext_controls *ctrls)
1176{
1177 struct uvc_fh *handle = fh;
1178
1179 return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, VIDIOC_TRY_EXT_CTRLS);
1180}
1181
1182static int uvc_ioctl_querymenu(struct file *file, void *fh,
1183 struct v4l2_querymenu *qm)
1184{
1185 struct uvc_fh *handle = fh;
1186 struct uvc_video_chain *chain = handle->chain;
1187
1188 return uvc_query_v4l2_menu(chain, query_menu: qm);
1189}
1190
1191static int uvc_ioctl_g_selection(struct file *file, void *fh,
1192 struct v4l2_selection *sel)
1193{
1194 struct uvc_fh *handle = fh;
1195 struct uvc_streaming *stream = handle->stream;
1196
1197 if (sel->type != stream->type)
1198 return -EINVAL;
1199
1200 switch (sel->target) {
1201 case V4L2_SEL_TGT_CROP_DEFAULT:
1202 case V4L2_SEL_TGT_CROP_BOUNDS:
1203 if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1204 return -EINVAL;
1205 break;
1206 case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1207 case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1208 if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1209 return -EINVAL;
1210 break;
1211 default:
1212 return -EINVAL;
1213 }
1214
1215 sel->r.left = 0;
1216 sel->r.top = 0;
1217 mutex_lock(&stream->mutex);
1218 sel->r.width = stream->cur_frame->wWidth;
1219 sel->r.height = stream->cur_frame->wHeight;
1220 mutex_unlock(lock: &stream->mutex);
1221
1222 return 0;
1223}
1224
1225static int uvc_ioctl_g_parm(struct file *file, void *fh,
1226 struct v4l2_streamparm *parm)
1227{
1228 struct uvc_fh *handle = fh;
1229 struct uvc_streaming *stream = handle->stream;
1230
1231 return uvc_v4l2_get_streamparm(stream, parm);
1232}
1233
1234static int uvc_ioctl_s_parm(struct file *file, void *fh,
1235 struct v4l2_streamparm *parm)
1236{
1237 struct uvc_fh *handle = fh;
1238 struct uvc_streaming *stream = handle->stream;
1239 int ret;
1240
1241 ret = uvc_acquire_privileges(handle);
1242 if (ret < 0)
1243 return ret;
1244
1245 return uvc_v4l2_set_streamparm(stream, parm);
1246}
1247
1248static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1249 struct v4l2_frmsizeenum *fsize)
1250{
1251 struct uvc_fh *handle = fh;
1252 struct uvc_streaming *stream = handle->stream;
1253 const struct uvc_format *format = NULL;
1254 const struct uvc_frame *frame = NULL;
1255 unsigned int index;
1256 unsigned int i;
1257
1258 /* Look for the given pixel format */
1259 for (i = 0; i < stream->nformats; i++) {
1260 if (stream->formats[i].fcc == fsize->pixel_format) {
1261 format = &stream->formats[i];
1262 break;
1263 }
1264 }
1265 if (format == NULL)
1266 return -EINVAL;
1267
1268 /* Skip duplicate frame sizes */
1269 for (i = 0, index = 0; i < format->nframes; i++) {
1270 if (frame && frame->wWidth == format->frames[i].wWidth &&
1271 frame->wHeight == format->frames[i].wHeight)
1272 continue;
1273 frame = &format->frames[i];
1274 if (index == fsize->index)
1275 break;
1276 index++;
1277 }
1278
1279 if (i == format->nframes)
1280 return -EINVAL;
1281
1282 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1283 fsize->discrete.width = frame->wWidth;
1284 fsize->discrete.height = frame->wHeight;
1285 return 0;
1286}
1287
1288static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1289 struct v4l2_frmivalenum *fival)
1290{
1291 struct uvc_fh *handle = fh;
1292 struct uvc_streaming *stream = handle->stream;
1293 const struct uvc_format *format = NULL;
1294 const struct uvc_frame *frame = NULL;
1295 unsigned int nintervals;
1296 unsigned int index;
1297 unsigned int i;
1298
1299 /* Look for the given pixel format and frame size */
1300 for (i = 0; i < stream->nformats; i++) {
1301 if (stream->formats[i].fcc == fival->pixel_format) {
1302 format = &stream->formats[i];
1303 break;
1304 }
1305 }
1306 if (format == NULL)
1307 return -EINVAL;
1308
1309 index = fival->index;
1310 for (i = 0; i < format->nframes; i++) {
1311 if (format->frames[i].wWidth == fival->width &&
1312 format->frames[i].wHeight == fival->height) {
1313 frame = &format->frames[i];
1314 nintervals = frame->bFrameIntervalType ?: 1;
1315 if (index < nintervals)
1316 break;
1317 index -= nintervals;
1318 }
1319 }
1320 if (i == format->nframes)
1321 return -EINVAL;
1322
1323 if (frame->bFrameIntervalType) {
1324 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1325 fival->discrete.numerator =
1326 frame->dwFrameInterval[index];
1327 fival->discrete.denominator = 10000000;
1328 v4l2_simplify_fraction(numerator: &fival->discrete.numerator,
1329 denominator: &fival->discrete.denominator, n_terms: 8, threshold: 333);
1330 } else {
1331 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1332 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1333 fival->stepwise.min.denominator = 10000000;
1334 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1335 fival->stepwise.max.denominator = 10000000;
1336 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1337 fival->stepwise.step.denominator = 10000000;
1338 v4l2_simplify_fraction(numerator: &fival->stepwise.min.numerator,
1339 denominator: &fival->stepwise.min.denominator, n_terms: 8, threshold: 333);
1340 v4l2_simplify_fraction(numerator: &fival->stepwise.max.numerator,
1341 denominator: &fival->stepwise.max.denominator, n_terms: 8, threshold: 333);
1342 v4l2_simplify_fraction(numerator: &fival->stepwise.step.numerator,
1343 denominator: &fival->stepwise.step.denominator, n_terms: 8, threshold: 333);
1344 }
1345
1346 return 0;
1347}
1348
1349static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1350 const struct v4l2_event_subscription *sub)
1351{
1352 switch (sub->type) {
1353 case V4L2_EVENT_CTRL:
1354 return v4l2_event_subscribe(fh, sub, elems: 0, ops: &uvc_ctrl_sub_ev_ops);
1355 default:
1356 return -EINVAL;
1357 }
1358}
1359
1360static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1361 unsigned int cmd, void *arg)
1362{
1363 struct uvc_fh *handle = fh;
1364 struct uvc_video_chain *chain = handle->chain;
1365
1366 switch (cmd) {
1367 /* Dynamic controls. */
1368 case UVCIOC_CTRL_MAP:
1369 return uvc_ioctl_xu_ctrl_map(chain, xmap: arg);
1370
1371 case UVCIOC_CTRL_QUERY:
1372 return uvc_xu_ctrl_query(chain, xqry: arg);
1373
1374 default:
1375 return -ENOTTY;
1376 }
1377}
1378
1379#ifdef CONFIG_COMPAT
1380struct uvc_xu_control_mapping32 {
1381 u32 id;
1382 u8 name[32];
1383 u8 entity[16];
1384 u8 selector;
1385
1386 u8 size;
1387 u8 offset;
1388 u32 v4l2_type;
1389 u32 data_type;
1390
1391 compat_caddr_t menu_info;
1392 u32 menu_count;
1393
1394 u32 reserved[4];
1395};
1396
1397static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1398 const struct uvc_xu_control_mapping32 __user *up)
1399{
1400 struct uvc_xu_control_mapping32 *p = (void *)kp;
1401 compat_caddr_t info;
1402 u32 count;
1403
1404 if (copy_from_user(to: p, from: up, n: sizeof(*p)))
1405 return -EFAULT;
1406
1407 count = p->menu_count;
1408 info = p->menu_info;
1409
1410 memset(kp->reserved, 0, sizeof(kp->reserved));
1411 kp->menu_info = count ? compat_ptr(uptr: info) : NULL;
1412 kp->menu_count = count;
1413 return 0;
1414}
1415
1416static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1417 struct uvc_xu_control_mapping32 __user *up)
1418{
1419 if (copy_to_user(to: up, from: kp, offsetof(typeof(*up), menu_info)) ||
1420 put_user(kp->menu_count, &up->menu_count))
1421 return -EFAULT;
1422
1423 if (clear_user(to: up->reserved, n: sizeof(up->reserved)))
1424 return -EFAULT;
1425
1426 return 0;
1427}
1428
1429struct uvc_xu_control_query32 {
1430 u8 unit;
1431 u8 selector;
1432 u8 query;
1433 u16 size;
1434 compat_caddr_t data;
1435};
1436
1437static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1438 const struct uvc_xu_control_query32 __user *up)
1439{
1440 struct uvc_xu_control_query32 v;
1441
1442 if (copy_from_user(to: &v, from: up, n: sizeof(v)))
1443 return -EFAULT;
1444
1445 *kp = (struct uvc_xu_control_query){
1446 .unit = v.unit,
1447 .selector = v.selector,
1448 .query = v.query,
1449 .size = v.size,
1450 .data = v.size ? compat_ptr(uptr: v.data) : NULL
1451 };
1452 return 0;
1453}
1454
1455static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1456 struct uvc_xu_control_query32 __user *up)
1457{
1458 if (copy_to_user(to: up, from: kp, offsetof(typeof(*up), data)))
1459 return -EFAULT;
1460 return 0;
1461}
1462
1463#define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1464#define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32)
1465
1466static long uvc_v4l2_compat_ioctl32(struct file *file,
1467 unsigned int cmd, unsigned long arg)
1468{
1469 struct uvc_fh *handle = file->private_data;
1470 union {
1471 struct uvc_xu_control_mapping xmap;
1472 struct uvc_xu_control_query xqry;
1473 } karg;
1474 void __user *up = compat_ptr(uptr: arg);
1475 long ret;
1476
1477 switch (cmd) {
1478 case UVCIOC_CTRL_MAP32:
1479 ret = uvc_v4l2_get_xu_mapping(kp: &karg.xmap, up);
1480 if (ret)
1481 return ret;
1482 ret = uvc_ioctl_xu_ctrl_map(chain: handle->chain, xmap: &karg.xmap);
1483 if (ret)
1484 return ret;
1485 ret = uvc_v4l2_put_xu_mapping(kp: &karg.xmap, up);
1486 if (ret)
1487 return ret;
1488
1489 break;
1490
1491 case UVCIOC_CTRL_QUERY32:
1492 ret = uvc_v4l2_get_xu_query(kp: &karg.xqry, up);
1493 if (ret)
1494 return ret;
1495 ret = uvc_xu_ctrl_query(chain: handle->chain, xqry: &karg.xqry);
1496 if (ret)
1497 return ret;
1498 ret = uvc_v4l2_put_xu_query(kp: &karg.xqry, up);
1499 if (ret)
1500 return ret;
1501 break;
1502
1503 default:
1504 return -ENOIOCTLCMD;
1505 }
1506
1507 return ret;
1508}
1509#endif
1510
1511static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1512 size_t count, loff_t *ppos)
1513{
1514 struct uvc_fh *handle = file->private_data;
1515 struct uvc_streaming *stream = handle->stream;
1516
1517 uvc_dbg(stream->dev, CALLS, "%s: not implemented\n", __func__);
1518 return -EINVAL;
1519}
1520
1521static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1522{
1523 struct uvc_fh *handle = file->private_data;
1524 struct uvc_streaming *stream = handle->stream;
1525
1526 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
1527
1528 return uvc_queue_mmap(queue: &stream->queue, vma);
1529}
1530
1531static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
1532{
1533 struct uvc_fh *handle = file->private_data;
1534 struct uvc_streaming *stream = handle->stream;
1535
1536 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
1537
1538 return uvc_queue_poll(queue: &stream->queue, file, wait);
1539}
1540
1541#ifndef CONFIG_MMU
1542static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1543 unsigned long addr, unsigned long len, unsigned long pgoff,
1544 unsigned long flags)
1545{
1546 struct uvc_fh *handle = file->private_data;
1547 struct uvc_streaming *stream = handle->stream;
1548
1549 uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
1550
1551 return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1552}
1553#endif
1554
1555const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1556 .vidioc_querycap = uvc_ioctl_querycap,
1557 .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1558 .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1559 .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1560 .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1561 .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1562 .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1563 .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1564 .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1565 .vidioc_reqbufs = uvc_ioctl_reqbufs,
1566 .vidioc_querybuf = uvc_ioctl_querybuf,
1567 .vidioc_qbuf = uvc_ioctl_qbuf,
1568 .vidioc_expbuf = uvc_ioctl_expbuf,
1569 .vidioc_dqbuf = uvc_ioctl_dqbuf,
1570 .vidioc_create_bufs = uvc_ioctl_create_bufs,
1571 .vidioc_streamon = uvc_ioctl_streamon,
1572 .vidioc_streamoff = uvc_ioctl_streamoff,
1573 .vidioc_enum_input = uvc_ioctl_enum_input,
1574 .vidioc_g_input = uvc_ioctl_g_input,
1575 .vidioc_s_input = uvc_ioctl_s_input,
1576 .vidioc_queryctrl = uvc_ioctl_queryctrl,
1577 .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1578 .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1579 .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1580 .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1581 .vidioc_querymenu = uvc_ioctl_querymenu,
1582 .vidioc_g_selection = uvc_ioctl_g_selection,
1583 .vidioc_g_parm = uvc_ioctl_g_parm,
1584 .vidioc_s_parm = uvc_ioctl_s_parm,
1585 .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1586 .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1587 .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1588 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1589 .vidioc_default = uvc_ioctl_default,
1590};
1591
1592const struct v4l2_file_operations uvc_fops = {
1593 .owner = THIS_MODULE,
1594 .open = uvc_v4l2_open,
1595 .release = uvc_v4l2_release,
1596 .unlocked_ioctl = video_ioctl2,
1597#ifdef CONFIG_COMPAT
1598 .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1599#endif
1600 .read = uvc_v4l2_read,
1601 .mmap = uvc_v4l2_mmap,
1602 .poll = uvc_v4l2_poll,
1603#ifndef CONFIG_MMU
1604 .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1605#endif
1606};
1607
1608

source code of linux/drivers/media/usb/uvc/uvc_v4l2.c