2 * uvc_v4l2.c -- USB Video Class driver - V4L2 API
4 * Copyright (C) 2005-2010
5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
14 #include <linux/compat.h>
15 #include <linux/kernel.h>
16 #include <linux/version.h>
17 #include <linux/list.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/usb.h>
21 #include <linux/videodev2.h>
22 #include <linux/vmalloc.h>
24 #include <linux/wait.h>
25 #include <linux/atomic.h>
27 #include <media/v4l2-common.h>
28 #include <media/v4l2-ctrls.h>
29 #include <media/v4l2-event.h>
30 #include <media/v4l2-ioctl.h>
34 /* ------------------------------------------------------------------------
37 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
38 struct uvc_xu_control_mapping *xmap)
40 struct uvc_control_mapping *map;
44 map = kzalloc(sizeof *map, GFP_KERNEL);
49 memcpy(map->name, xmap->name, sizeof map->name);
50 memcpy(map->entity, xmap->entity, sizeof map->entity);
51 map->selector = xmap->selector;
52 map->size = xmap->size;
53 map->offset = xmap->offset;
54 map->v4l2_type = xmap->v4l2_type;
55 map->data_type = xmap->data_type;
57 switch (xmap->v4l2_type) {
58 case V4L2_CTRL_TYPE_INTEGER:
59 case V4L2_CTRL_TYPE_BOOLEAN:
60 case V4L2_CTRL_TYPE_BUTTON:
63 case V4L2_CTRL_TYPE_MENU:
64 /* Prevent excessive memory consumption, as well as integer
67 if (xmap->menu_count == 0 ||
68 xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
73 size = xmap->menu_count * sizeof(*map->menu_info);
74 map->menu_info = kmalloc(size, GFP_KERNEL);
75 if (map->menu_info == NULL) {
80 if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
85 map->menu_count = xmap->menu_count;
89 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
90 "%u.\n", xmap->v4l2_type);
95 ret = uvc_ctrl_add_mapping(chain, map);
98 kfree(map->menu_info);
104 /* ------------------------------------------------------------------------
109 * Find the frame interval closest to the requested frame interval for the
110 * given frame format and size. This should be done by the device as part of
111 * the Video Probe and Commit negotiation, but some hardware don't implement
114 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
118 if (frame->bFrameIntervalType) {
119 __u32 best = -1, dist;
121 for (i = 0; i < frame->bFrameIntervalType; ++i) {
122 dist = interval > frame->dwFrameInterval[i]
123 ? interval - frame->dwFrameInterval[i]
124 : frame->dwFrameInterval[i] - interval;
132 interval = frame->dwFrameInterval[i-1];
134 const __u32 min = frame->dwFrameInterval[0];
135 const __u32 max = frame->dwFrameInterval[1];
136 const __u32 step = frame->dwFrameInterval[2];
138 interval = min + (interval - min + step/2) / step * step;
146 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
147 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
148 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
150 struct uvc_format *format = NULL;
151 struct uvc_frame *frame = NULL;
153 unsigned int d, maxd;
159 if (fmt->type != stream->type)
162 fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
163 uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
164 fmt->fmt.pix.pixelformat,
165 fcc[0], fcc[1], fcc[2], fcc[3],
166 fmt->fmt.pix.width, fmt->fmt.pix.height);
168 /* Check if the hardware supports the requested format, use the default
171 for (i = 0; i < stream->nformats; ++i) {
172 format = &stream->format[i];
173 if (format->fcc == fmt->fmt.pix.pixelformat)
177 if (i == stream->nformats) {
178 format = stream->def_format;
179 fmt->fmt.pix.pixelformat = format->fcc;
182 /* Find the closest image size. The distance between image sizes is
183 * the size in pixels of the non-overlapping regions between the
184 * requested size and the frame-specified size.
186 rw = fmt->fmt.pix.width;
187 rh = fmt->fmt.pix.height;
188 maxd = (unsigned int)-1;
190 for (i = 0; i < format->nframes; ++i) {
191 __u16 w = format->frame[i].wWidth;
192 __u16 h = format->frame[i].wHeight;
194 d = min(w, rw) * min(h, rh);
195 d = w*h + rw*rh - 2*d;
198 frame = &format->frame[i];
206 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
207 fmt->fmt.pix.width, fmt->fmt.pix.height);
211 /* Use the default frame interval. */
212 interval = frame->dwDefaultFrameInterval;
213 uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
214 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
215 (100000000/interval)%10);
217 /* Set the format index, frame index and frame interval. */
218 memset(probe, 0, sizeof *probe);
219 probe->bmHint = 1; /* dwFrameInterval */
220 probe->bFormatIndex = format->index;
221 probe->bFrameIndex = frame->bFrameIndex;
222 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
223 /* Some webcams stall the probe control set request when the
224 * dwMaxVideoFrameSize field is set to zero. The UVC specification
225 * clearly states that the field is read-only from the host, so this
226 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
227 * the webcam to work around the problem.
229 * The workaround could probably be enabled for all webcams, so the
230 * quirk can be removed if needed. It's currently useful to detect
231 * webcam bugs and fix them before they hit the market (providing
232 * developers test their webcams with the Linux driver as well as with
233 * the Windows driver).
235 mutex_lock(&stream->mutex);
236 if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
237 probe->dwMaxVideoFrameSize =
238 stream->ctrl.dwMaxVideoFrameSize;
240 /* Probe the device. */
241 ret = uvc_probe_video(stream, probe);
242 mutex_unlock(&stream->mutex);
246 fmt->fmt.pix.width = frame->wWidth;
247 fmt->fmt.pix.height = frame->wHeight;
248 fmt->fmt.pix.field = V4L2_FIELD_NONE;
249 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
250 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
251 fmt->fmt.pix.colorspace = format->colorspace;
252 fmt->fmt.pix.priv = 0;
254 if (uvc_format != NULL)
255 *uvc_format = format;
256 if (uvc_frame != NULL)
263 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
264 struct v4l2_format *fmt)
266 struct uvc_format *format;
267 struct uvc_frame *frame;
270 if (fmt->type != stream->type)
273 mutex_lock(&stream->mutex);
274 format = stream->cur_format;
275 frame = stream->cur_frame;
277 if (format == NULL || frame == NULL) {
282 fmt->fmt.pix.pixelformat = format->fcc;
283 fmt->fmt.pix.width = frame->wWidth;
284 fmt->fmt.pix.height = frame->wHeight;
285 fmt->fmt.pix.field = V4L2_FIELD_NONE;
286 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
287 fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
288 fmt->fmt.pix.colorspace = format->colorspace;
289 fmt->fmt.pix.priv = 0;
292 mutex_unlock(&stream->mutex);
296 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
297 struct v4l2_format *fmt)
299 struct uvc_streaming_control probe;
300 struct uvc_format *format;
301 struct uvc_frame *frame;
304 if (fmt->type != stream->type)
307 ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
311 mutex_lock(&stream->mutex);
313 if (uvc_queue_allocated(&stream->queue)) {
318 stream->ctrl = probe;
319 stream->cur_format = format;
320 stream->cur_frame = frame;
323 mutex_unlock(&stream->mutex);
327 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
328 struct v4l2_streamparm *parm)
330 uint32_t numerator, denominator;
332 if (parm->type != stream->type)
335 mutex_lock(&stream->mutex);
336 numerator = stream->ctrl.dwFrameInterval;
337 mutex_unlock(&stream->mutex);
339 denominator = 10000000;
340 uvc_simplify_fraction(&numerator, &denominator, 8, 333);
342 memset(parm, 0, sizeof *parm);
343 parm->type = stream->type;
345 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
346 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
347 parm->parm.capture.capturemode = 0;
348 parm->parm.capture.timeperframe.numerator = numerator;
349 parm->parm.capture.timeperframe.denominator = denominator;
350 parm->parm.capture.extendedmode = 0;
351 parm->parm.capture.readbuffers = 0;
353 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
354 parm->parm.output.outputmode = 0;
355 parm->parm.output.timeperframe.numerator = numerator;
356 parm->parm.output.timeperframe.denominator = denominator;
362 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
363 struct v4l2_streamparm *parm)
365 struct uvc_streaming_control probe;
366 struct v4l2_fract timeperframe;
370 if (parm->type != stream->type)
373 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
374 timeperframe = parm->parm.capture.timeperframe;
376 timeperframe = parm->parm.output.timeperframe;
378 interval = uvc_fraction_to_interval(timeperframe.numerator,
379 timeperframe.denominator);
380 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
381 timeperframe.numerator, timeperframe.denominator, interval);
383 mutex_lock(&stream->mutex);
385 if (uvc_queue_streaming(&stream->queue)) {
386 mutex_unlock(&stream->mutex);
390 probe = stream->ctrl;
391 probe.dwFrameInterval =
392 uvc_try_frame_interval(stream->cur_frame, interval);
394 /* Probe the device with the new settings. */
395 ret = uvc_probe_video(stream, &probe);
397 mutex_unlock(&stream->mutex);
401 stream->ctrl = probe;
402 mutex_unlock(&stream->mutex);
404 /* Return the actual frame period. */
405 timeperframe.numerator = probe.dwFrameInterval;
406 timeperframe.denominator = 10000000;
407 uvc_simplify_fraction(&timeperframe.numerator,
408 &timeperframe.denominator, 8, 333);
410 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
411 parm->parm.capture.timeperframe = timeperframe;
413 parm->parm.output.timeperframe = timeperframe;
418 /* ------------------------------------------------------------------------
419 * Privilege management
423 * Privilege management is the multiple-open implementation basis. The current
424 * implementation is completely transparent for the end-user and doesn't
425 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
426 * Those ioctls enable finer control on the device (by making possible for a
427 * user to request exclusive access to a device), but are not mature yet.
428 * Switching to the V4L2 priority mechanism might be considered in the future
429 * if this situation changes.
431 * Each open instance of a UVC device can either be in a privileged or
432 * unprivileged state. Only a single instance can be in a privileged state at
433 * a given time. Trying to perform an operation that requires privileges will
434 * automatically acquire the required privileges if possible, or return -EBUSY
435 * otherwise. Privileges are dismissed when closing the instance or when
436 * freeing the video buffers using VIDIOC_REQBUFS.
438 * Operations that require privileges are:
445 static int uvc_acquire_privileges(struct uvc_fh *handle)
447 /* Always succeed if the handle is already privileged. */
448 if (handle->state == UVC_HANDLE_ACTIVE)
451 /* Check if the device already has a privileged handle. */
452 if (atomic_inc_return(&handle->stream->active) != 1) {
453 atomic_dec(&handle->stream->active);
457 handle->state = UVC_HANDLE_ACTIVE;
461 static void uvc_dismiss_privileges(struct uvc_fh *handle)
463 if (handle->state == UVC_HANDLE_ACTIVE)
464 atomic_dec(&handle->stream->active);
466 handle->state = UVC_HANDLE_PASSIVE;
469 static int uvc_has_privileges(struct uvc_fh *handle)
471 return handle->state == UVC_HANDLE_ACTIVE;
474 /* ------------------------------------------------------------------------
475 * V4L2 file operations
478 static int uvc_v4l2_open(struct file *file)
480 struct uvc_streaming *stream;
481 struct uvc_fh *handle;
484 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
485 stream = video_drvdata(file);
487 if (stream->dev->state & UVC_DEV_DISCONNECTED)
490 ret = usb_autopm_get_interface(stream->dev->intf);
494 /* Create the device handle. */
495 handle = kzalloc(sizeof *handle, GFP_KERNEL);
496 if (handle == NULL) {
497 usb_autopm_put_interface(stream->dev->intf);
501 if (atomic_inc_return(&stream->dev->users) == 1) {
502 ret = uvc_status_start(stream->dev);
504 atomic_dec(&stream->dev->users);
505 usb_autopm_put_interface(stream->dev->intf);
511 v4l2_fh_init(&handle->vfh, stream->vdev);
512 v4l2_fh_add(&handle->vfh);
513 handle->chain = stream->chain;
514 handle->stream = stream;
515 handle->state = UVC_HANDLE_PASSIVE;
516 file->private_data = handle;
521 static int uvc_v4l2_release(struct file *file)
523 struct uvc_fh *handle = file->private_data;
524 struct uvc_streaming *stream = handle->stream;
526 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
528 /* Only free resources if this is a privileged handle. */
529 if (uvc_has_privileges(handle)) {
530 uvc_video_enable(stream, 0);
531 uvc_free_buffers(&stream->queue);
534 /* Release the file handle. */
535 uvc_dismiss_privileges(handle);
536 v4l2_fh_del(&handle->vfh);
537 v4l2_fh_exit(&handle->vfh);
539 file->private_data = NULL;
541 if (atomic_dec_return(&stream->dev->users) == 0)
542 uvc_status_stop(stream->dev);
544 usb_autopm_put_interface(stream->dev->intf);
548 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
550 struct video_device *vdev = video_devdata(file);
551 struct uvc_fh *handle = file->private_data;
552 struct uvc_video_chain *chain = handle->chain;
553 struct uvc_streaming *stream = handle->stream;
557 /* Query capabilities */
558 case VIDIOC_QUERYCAP:
560 struct v4l2_capability *cap = arg;
562 memset(cap, 0, sizeof *cap);
563 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
564 strlcpy(cap->card, vdev->name, sizeof cap->card);
565 usb_make_path(stream->dev->udev,
566 cap->bus_info, sizeof(cap->bus_info));
567 cap->version = LINUX_VERSION_CODE;
568 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
570 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
571 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
572 | V4L2_CAP_STREAMING;
574 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT
575 | V4L2_CAP_STREAMING;
580 case VIDIOC_G_PRIORITY:
581 *(u32 *)arg = v4l2_prio_max(vdev->prio);
584 case VIDIOC_S_PRIORITY:
585 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
589 return v4l2_prio_change(vdev->prio, &handle->vfh.prio,
592 /* Get, Set & Query control */
593 case VIDIOC_QUERYCTRL:
594 return uvc_query_v4l2_ctrl(chain, arg);
598 struct v4l2_control *ctrl = arg;
599 struct v4l2_ext_control xctrl;
601 memset(&xctrl, 0, sizeof xctrl);
604 ret = uvc_ctrl_begin(chain);
608 ret = uvc_ctrl_get(chain, &xctrl);
609 uvc_ctrl_rollback(handle);
611 ctrl->value = xctrl.value;
617 struct v4l2_control *ctrl = arg;
618 struct v4l2_ext_control xctrl;
620 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
624 memset(&xctrl, 0, sizeof xctrl);
626 xctrl.value = ctrl->value;
628 ret = uvc_ctrl_begin(chain);
632 ret = uvc_ctrl_set(chain, &xctrl);
634 uvc_ctrl_rollback(handle);
637 ret = uvc_ctrl_commit(handle, &xctrl, 1);
639 ctrl->value = xctrl.value;
643 case VIDIOC_QUERYMENU:
644 return uvc_query_v4l2_menu(chain, arg);
646 case VIDIOC_G_EXT_CTRLS:
648 struct v4l2_ext_controls *ctrls = arg;
649 struct v4l2_ext_control *ctrl = ctrls->controls;
652 ret = uvc_ctrl_begin(chain);
656 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
657 ret = uvc_ctrl_get(chain, ctrl);
659 uvc_ctrl_rollback(handle);
660 ctrls->error_idx = i;
664 ctrls->error_idx = 0;
665 ret = uvc_ctrl_rollback(handle);
669 case VIDIOC_S_EXT_CTRLS:
670 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
674 case VIDIOC_TRY_EXT_CTRLS:
676 struct v4l2_ext_controls *ctrls = arg;
677 struct v4l2_ext_control *ctrl = ctrls->controls;
680 ret = uvc_ctrl_begin(chain);
684 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
685 ret = uvc_ctrl_set(chain, ctrl);
687 uvc_ctrl_rollback(handle);
688 ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS
694 ctrls->error_idx = 0;
696 if (cmd == VIDIOC_S_EXT_CTRLS)
697 ret = uvc_ctrl_commit(handle,
698 ctrls->controls, ctrls->count);
700 ret = uvc_ctrl_rollback(handle);
704 /* Get, Set & Enum input */
705 case VIDIOC_ENUMINPUT:
707 const struct uvc_entity *selector = chain->selector;
708 struct v4l2_input *input = arg;
709 struct uvc_entity *iterm = NULL;
710 u32 index = input->index;
713 if (selector == NULL ||
714 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
717 list_for_each_entry(iterm, &chain->entities, chain) {
718 if (UVC_ENTITY_IS_ITERM(iterm))
722 } else if (index < selector->bNrInPins) {
723 pin = selector->baSourceID[index];
724 list_for_each_entry(iterm, &chain->entities, chain) {
725 if (!UVC_ENTITY_IS_ITERM(iterm))
727 if (iterm->id == pin)
732 if (iterm == NULL || iterm->id != pin)
735 memset(input, 0, sizeof *input);
736 input->index = index;
737 strlcpy(input->name, iterm->name, sizeof input->name);
738 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
739 input->type = V4L2_INPUT_TYPE_CAMERA;
747 if (chain->selector == NULL ||
748 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
753 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
754 chain->selector->id, chain->dev->intfnum,
755 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
759 *(int *)arg = input - 1;
765 u32 input = *(u32 *)arg + 1;
767 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
771 if ((ret = uvc_acquire_privileges(handle)) < 0)
774 if (chain->selector == NULL ||
775 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
781 if (input == 0 || input > chain->selector->bNrInPins)
784 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
785 chain->selector->id, chain->dev->intfnum,
786 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
789 /* Try, Get, Set & Enum format */
790 case VIDIOC_ENUM_FMT:
792 struct v4l2_fmtdesc *fmt = arg;
793 struct uvc_format *format;
794 enum v4l2_buf_type type = fmt->type;
795 __u32 index = fmt->index;
797 if (fmt->type != stream->type ||
798 fmt->index >= stream->nformats)
801 memset(fmt, 0, sizeof(*fmt));
805 format = &stream->format[fmt->index];
807 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
808 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
809 strlcpy(fmt->description, format->name,
810 sizeof fmt->description);
811 fmt->description[sizeof fmt->description - 1] = 0;
812 fmt->pixelformat = format->fcc;
818 struct uvc_streaming_control probe;
820 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
824 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
828 if ((ret = uvc_acquire_privileges(handle)) < 0)
831 return uvc_v4l2_set_format(stream, arg);
834 return uvc_v4l2_get_format(stream, arg);
836 /* Frame size enumeration */
837 case VIDIOC_ENUM_FRAMESIZES:
839 struct v4l2_frmsizeenum *fsize = arg;
840 struct uvc_format *format = NULL;
841 struct uvc_frame *frame;
844 /* Look for the given pixel format */
845 for (i = 0; i < stream->nformats; i++) {
846 if (stream->format[i].fcc ==
847 fsize->pixel_format) {
848 format = &stream->format[i];
855 if (fsize->index >= format->nframes)
858 frame = &format->frame[fsize->index];
859 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
860 fsize->discrete.width = frame->wWidth;
861 fsize->discrete.height = frame->wHeight;
865 /* Frame interval enumeration */
866 case VIDIOC_ENUM_FRAMEINTERVALS:
868 struct v4l2_frmivalenum *fival = arg;
869 struct uvc_format *format = NULL;
870 struct uvc_frame *frame = NULL;
873 /* Look for the given pixel format and frame size */
874 for (i = 0; i < stream->nformats; i++) {
875 if (stream->format[i].fcc ==
876 fival->pixel_format) {
877 format = &stream->format[i];
884 for (i = 0; i < format->nframes; i++) {
885 if (format->frame[i].wWidth == fival->width &&
886 format->frame[i].wHeight == fival->height) {
887 frame = &format->frame[i];
894 if (frame->bFrameIntervalType) {
895 if (fival->index >= frame->bFrameIntervalType)
898 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
899 fival->discrete.numerator =
900 frame->dwFrameInterval[fival->index];
901 fival->discrete.denominator = 10000000;
902 uvc_simplify_fraction(&fival->discrete.numerator,
903 &fival->discrete.denominator, 8, 333);
905 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
906 fival->stepwise.min.numerator =
907 frame->dwFrameInterval[0];
908 fival->stepwise.min.denominator = 10000000;
909 fival->stepwise.max.numerator =
910 frame->dwFrameInterval[1];
911 fival->stepwise.max.denominator = 10000000;
912 fival->stepwise.step.numerator =
913 frame->dwFrameInterval[2];
914 fival->stepwise.step.denominator = 10000000;
915 uvc_simplify_fraction(&fival->stepwise.min.numerator,
916 &fival->stepwise.min.denominator, 8, 333);
917 uvc_simplify_fraction(&fival->stepwise.max.numerator,
918 &fival->stepwise.max.denominator, 8, 333);
919 uvc_simplify_fraction(&fival->stepwise.step.numerator,
920 &fival->stepwise.step.denominator, 8, 333);
925 /* Get & Set streaming parameters */
927 return uvc_v4l2_get_streamparm(stream, arg);
930 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
934 if ((ret = uvc_acquire_privileges(handle)) < 0)
937 return uvc_v4l2_set_streamparm(stream, arg);
939 /* Cropping and scaling */
942 struct v4l2_cropcap *ccap = arg;
944 if (ccap->type != stream->type)
947 ccap->bounds.left = 0;
948 ccap->bounds.top = 0;
950 mutex_lock(&stream->mutex);
951 ccap->bounds.width = stream->cur_frame->wWidth;
952 ccap->bounds.height = stream->cur_frame->wHeight;
953 mutex_unlock(&stream->mutex);
955 ccap->defrect = ccap->bounds;
957 ccap->pixelaspect.numerator = 1;
958 ccap->pixelaspect.denominator = 1;
966 /* Buffers & streaming */
968 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
972 if ((ret = uvc_acquire_privileges(handle)) < 0)
975 mutex_lock(&stream->mutex);
976 ret = uvc_alloc_buffers(&stream->queue, arg);
977 mutex_unlock(&stream->mutex);
982 uvc_dismiss_privileges(handle);
987 case VIDIOC_QUERYBUF:
989 struct v4l2_buffer *buf = arg;
991 if (!uvc_has_privileges(handle))
994 return uvc_query_buffer(&stream->queue, buf);
998 if (!uvc_has_privileges(handle))
1001 return uvc_queue_buffer(&stream->queue, arg);
1004 if (!uvc_has_privileges(handle))
1007 return uvc_dequeue_buffer(&stream->queue, arg,
1008 file->f_flags & O_NONBLOCK);
1010 case VIDIOC_STREAMON:
1014 if (*type != stream->type)
1017 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
1021 if (!uvc_has_privileges(handle))
1024 mutex_lock(&stream->mutex);
1025 ret = uvc_video_enable(stream, 1);
1026 mutex_unlock(&stream->mutex);
1032 case VIDIOC_STREAMOFF:
1036 if (*type != stream->type)
1039 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
1043 if (!uvc_has_privileges(handle))
1046 return uvc_video_enable(stream, 0);
1049 case VIDIOC_SUBSCRIBE_EVENT:
1051 struct v4l2_event_subscription *sub = arg;
1053 switch (sub->type) {
1054 case V4L2_EVENT_CTRL:
1055 return v4l2_event_subscribe(&handle->vfh, sub, 0,
1056 &uvc_ctrl_sub_ev_ops);
1062 case VIDIOC_UNSUBSCRIBE_EVENT:
1063 return v4l2_event_unsubscribe(&handle->vfh, arg);
1065 case VIDIOC_DQEVENT:
1066 return v4l2_event_dequeue(&handle->vfh, arg,
1067 file->f_flags & O_NONBLOCK);
1069 /* Analog video standards make no sense for digital cameras. */
1070 case VIDIOC_ENUMSTD:
1071 case VIDIOC_QUERYSTD:
1075 case VIDIOC_OVERLAY:
1077 case VIDIOC_ENUMAUDIO:
1078 case VIDIOC_ENUMAUDOUT:
1080 case VIDIOC_ENUMOUTPUT:
1081 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1084 case UVCIOC_CTRL_MAP:
1085 return uvc_ioctl_ctrl_map(chain, arg);
1087 case UVCIOC_CTRL_QUERY:
1088 return uvc_xu_ctrl_query(chain, arg);
1091 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
1098 static long uvc_v4l2_ioctl(struct file *file,
1099 unsigned int cmd, unsigned long arg)
1101 if (uvc_trace_param & UVC_TRACE_IOCTL) {
1102 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1103 v4l_printk_ioctl(NULL, cmd);
1107 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1110 #ifdef CONFIG_COMPAT
1111 struct uvc_xu_control_mapping32 {
1122 compat_caddr_t menu_info;
1128 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1129 const struct uvc_xu_control_mapping32 __user *up)
1131 struct uvc_menu_info __user *umenus;
1132 struct uvc_menu_info __user *kmenus;
1135 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1136 __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1137 __get_user(kp->menu_count, &up->menu_count))
1140 memset(kp->reserved, 0, sizeof(kp->reserved));
1142 if (kp->menu_count == 0) {
1143 kp->menu_info = NULL;
1147 if (__get_user(p, &up->menu_info))
1149 umenus = compat_ptr(p);
1150 if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus)))
1153 kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus));
1156 kp->menu_info = kmenus;
1158 if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus)))
1164 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1165 struct uvc_xu_control_mapping32 __user *up)
1167 struct uvc_menu_info __user *umenus;
1168 struct uvc_menu_info __user *kmenus = kp->menu_info;
1171 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1172 __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1173 __put_user(kp->menu_count, &up->menu_count))
1176 if (__clear_user(up->reserved, sizeof(up->reserved)))
1179 if (kp->menu_count == 0)
1182 if (get_user(p, &up->menu_info))
1184 umenus = compat_ptr(p);
1186 if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus)))
1192 struct uvc_xu_control_query32 {
1197 compat_caddr_t data;
1200 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1201 const struct uvc_xu_control_query32 __user *up)
1207 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1208 __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1211 if (kp->size == 0) {
1216 if (__get_user(p, &up->data))
1218 udata = compat_ptr(p);
1219 if (!access_ok(VERIFY_READ, udata, kp->size))
1222 kdata = compat_alloc_user_space(kp->size);
1227 if (copy_in_user(kdata, udata, kp->size))
1233 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1234 struct uvc_xu_control_query32 __user *up)
1237 u8 __user *kdata = kp->data;
1240 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1241 __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1247 if (get_user(p, &up->data))
1249 udata = compat_ptr(p);
1250 if (!access_ok(VERIFY_READ, udata, kp->size))
1253 if (copy_in_user(udata, kdata, kp->size))
1259 #define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1260 #define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32)
1262 static long uvc_v4l2_compat_ioctl32(struct file *file,
1263 unsigned int cmd, unsigned long arg)
1266 struct uvc_xu_control_mapping xmap;
1267 struct uvc_xu_control_query xqry;
1269 void __user *up = compat_ptr(arg);
1270 mm_segment_t old_fs;
1274 case UVCIOC_CTRL_MAP32:
1275 cmd = UVCIOC_CTRL_MAP;
1276 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1279 case UVCIOC_CTRL_QUERY32:
1280 cmd = UVCIOC_CTRL_QUERY;
1281 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1285 return -ENOIOCTLCMD;
1290 ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg);
1297 case UVCIOC_CTRL_MAP:
1298 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1301 case UVCIOC_CTRL_QUERY:
1302 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1310 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1311 size_t count, loff_t *ppos)
1313 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1317 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1319 struct uvc_fh *handle = file->private_data;
1320 struct uvc_streaming *stream = handle->stream;
1322 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1324 return uvc_queue_mmap(&stream->queue, vma);
1327 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1329 struct uvc_fh *handle = file->private_data;
1330 struct uvc_streaming *stream = handle->stream;
1332 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1334 return uvc_queue_poll(&stream->queue, file, wait);
1338 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1339 unsigned long addr, unsigned long len, unsigned long pgoff,
1340 unsigned long flags)
1342 struct uvc_fh *handle = file->private_data;
1343 struct uvc_streaming *stream = handle->stream;
1345 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1347 return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1351 const struct v4l2_file_operations uvc_fops = {
1352 .owner = THIS_MODULE,
1353 .open = uvc_v4l2_open,
1354 .release = uvc_v4l2_release,
1355 .unlocked_ioctl = uvc_v4l2_ioctl,
1356 #ifdef CONFIG_COMPAT
1357 .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1359 .read = uvc_v4l2_read,
1360 .mmap = uvc_v4l2_mmap,
1361 .poll = uvc_v4l2_poll,
1363 .get_unmapped_area = uvc_v4l2_get_unmapped_area,