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/kernel.h>
15 #include <linux/version.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/usb.h>
20 #include <linux/videodev2.h>
21 #include <linux/vmalloc.h>
23 #include <linux/wait.h>
24 #include <linux/atomic.h>
26 #include <media/v4l2-common.h>
27 #include <media/v4l2-ioctl.h>
31 /* ------------------------------------------------------------------------
34 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
35 struct uvc_xu_control_mapping *xmap)
37 struct uvc_control_mapping *map;
41 map = kzalloc(sizeof *map, GFP_KERNEL);
46 memcpy(map->name, xmap->name, sizeof map->name);
47 memcpy(map->entity, xmap->entity, sizeof map->entity);
48 map->selector = xmap->selector;
49 map->size = xmap->size;
50 map->offset = xmap->offset;
51 map->v4l2_type = xmap->v4l2_type;
52 map->data_type = xmap->data_type;
54 switch (xmap->v4l2_type) {
55 case V4L2_CTRL_TYPE_INTEGER:
56 case V4L2_CTRL_TYPE_BOOLEAN:
57 case V4L2_CTRL_TYPE_BUTTON:
60 case V4L2_CTRL_TYPE_MENU:
61 /* Prevent excessive memory consumption, as well as integer
64 if (xmap->menu_count == 0 ||
65 xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
70 size = xmap->menu_count * sizeof(*map->menu_info);
71 map->menu_info = kmalloc(size, GFP_KERNEL);
72 if (map->menu_info == NULL) {
77 if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
82 map->menu_count = xmap->menu_count;
86 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
87 "%u.\n", xmap->v4l2_type);
92 ret = uvc_ctrl_add_mapping(chain, map);
95 kfree(map->menu_info);
101 /* ------------------------------------------------------------------------
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
111 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
115 if (frame->bFrameIntervalType) {
116 __u32 best = -1, dist;
118 for (i = 0; i < frame->bFrameIntervalType; ++i) {
119 dist = interval > frame->dwFrameInterval[i]
120 ? interval - frame->dwFrameInterval[i]
121 : frame->dwFrameInterval[i] - interval;
129 interval = frame->dwFrameInterval[i-1];
131 const __u32 min = frame->dwFrameInterval[0];
132 const __u32 max = frame->dwFrameInterval[1];
133 const __u32 step = frame->dwFrameInterval[2];
135 interval = min + (interval - min + step/2) / step * step;
143 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
144 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
145 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
147 struct uvc_format *format = NULL;
148 struct uvc_frame *frame = NULL;
150 unsigned int d, maxd;
156 if (fmt->type != stream->type)
159 fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
160 uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
161 fmt->fmt.pix.pixelformat,
162 fcc[0], fcc[1], fcc[2], fcc[3],
163 fmt->fmt.pix.width, fmt->fmt.pix.height);
165 /* Check if the hardware supports the requested format. */
166 for (i = 0; i < stream->nformats; ++i) {
167 format = &stream->format[i];
168 if (format->fcc == fmt->fmt.pix.pixelformat)
172 if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
173 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
174 fmt->fmt.pix.pixelformat);
178 /* Find the closest image size. The distance between image sizes is
179 * the size in pixels of the non-overlapping regions between the
180 * requested size and the frame-specified size.
182 rw = fmt->fmt.pix.width;
183 rh = fmt->fmt.pix.height;
184 maxd = (unsigned int)-1;
186 for (i = 0; i < format->nframes; ++i) {
187 __u16 w = format->frame[i].wWidth;
188 __u16 h = format->frame[i].wHeight;
190 d = min(w, rw) * min(h, rh);
191 d = w*h + rw*rh - 2*d;
194 frame = &format->frame[i];
202 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
203 fmt->fmt.pix.width, fmt->fmt.pix.height);
207 /* Use the default frame interval. */
208 interval = frame->dwDefaultFrameInterval;
209 uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
210 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
211 (100000000/interval)%10);
213 /* Set the format index, frame index and frame interval. */
214 memset(probe, 0, sizeof *probe);
215 probe->bmHint = 1; /* dwFrameInterval */
216 probe->bFormatIndex = format->index;
217 probe->bFrameIndex = frame->bFrameIndex;
218 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
219 /* Some webcams stall the probe control set request when the
220 * dwMaxVideoFrameSize field is set to zero. The UVC specification
221 * clearly states that the field is read-only from the host, so this
222 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
223 * the webcam to work around the problem.
225 * The workaround could probably be enabled for all webcams, so the
226 * quirk can be removed if needed. It's currently useful to detect
227 * webcam bugs and fix them before they hit the market (providing
228 * developers test their webcams with the Linux driver as well as with
229 * the Windows driver).
231 mutex_lock(&stream->mutex);
232 if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
233 probe->dwMaxVideoFrameSize =
234 stream->ctrl.dwMaxVideoFrameSize;
236 /* Probe the device. */
237 ret = uvc_probe_video(stream, probe);
238 mutex_unlock(&stream->mutex);
242 fmt->fmt.pix.width = frame->wWidth;
243 fmt->fmt.pix.height = frame->wHeight;
244 fmt->fmt.pix.field = V4L2_FIELD_NONE;
245 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
246 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
247 fmt->fmt.pix.colorspace = format->colorspace;
248 fmt->fmt.pix.priv = 0;
250 if (uvc_format != NULL)
251 *uvc_format = format;
252 if (uvc_frame != NULL)
259 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
260 struct v4l2_format *fmt)
262 struct uvc_format *format;
263 struct uvc_frame *frame;
266 if (fmt->type != stream->type)
269 mutex_lock(&stream->mutex);
270 format = stream->cur_format;
271 frame = stream->cur_frame;
273 if (format == NULL || frame == NULL) {
278 fmt->fmt.pix.pixelformat = format->fcc;
279 fmt->fmt.pix.width = frame->wWidth;
280 fmt->fmt.pix.height = frame->wHeight;
281 fmt->fmt.pix.field = V4L2_FIELD_NONE;
282 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
283 fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
284 fmt->fmt.pix.colorspace = format->colorspace;
285 fmt->fmt.pix.priv = 0;
288 mutex_unlock(&stream->mutex);
292 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
293 struct v4l2_format *fmt)
295 struct uvc_streaming_control probe;
296 struct uvc_format *format;
297 struct uvc_frame *frame;
300 if (fmt->type != stream->type)
303 ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
307 mutex_lock(&stream->mutex);
309 if (uvc_queue_allocated(&stream->queue)) {
314 memcpy(&stream->ctrl, &probe, sizeof probe);
315 stream->cur_format = format;
316 stream->cur_frame = frame;
319 mutex_unlock(&stream->mutex);
323 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
324 struct v4l2_streamparm *parm)
326 uint32_t numerator, denominator;
328 if (parm->type != stream->type)
331 mutex_lock(&stream->mutex);
332 numerator = stream->ctrl.dwFrameInterval;
333 mutex_unlock(&stream->mutex);
335 denominator = 10000000;
336 uvc_simplify_fraction(&numerator, &denominator, 8, 333);
338 memset(parm, 0, sizeof *parm);
339 parm->type = stream->type;
341 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
342 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
343 parm->parm.capture.capturemode = 0;
344 parm->parm.capture.timeperframe.numerator = numerator;
345 parm->parm.capture.timeperframe.denominator = denominator;
346 parm->parm.capture.extendedmode = 0;
347 parm->parm.capture.readbuffers = 0;
349 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
350 parm->parm.output.outputmode = 0;
351 parm->parm.output.timeperframe.numerator = numerator;
352 parm->parm.output.timeperframe.denominator = denominator;
358 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
359 struct v4l2_streamparm *parm)
361 struct uvc_streaming_control probe;
362 struct v4l2_fract timeperframe;
366 if (parm->type != stream->type)
369 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
370 timeperframe = parm->parm.capture.timeperframe;
372 timeperframe = parm->parm.output.timeperframe;
374 interval = uvc_fraction_to_interval(timeperframe.numerator,
375 timeperframe.denominator);
376 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
377 timeperframe.numerator, timeperframe.denominator, interval);
379 mutex_lock(&stream->mutex);
381 if (uvc_queue_streaming(&stream->queue)) {
382 mutex_unlock(&stream->mutex);
386 memcpy(&probe, &stream->ctrl, sizeof probe);
387 probe.dwFrameInterval =
388 uvc_try_frame_interval(stream->cur_frame, interval);
390 /* Probe the device with the new settings. */
391 ret = uvc_probe_video(stream, &probe);
393 mutex_unlock(&stream->mutex);
397 memcpy(&stream->ctrl, &probe, sizeof probe);
398 mutex_unlock(&stream->mutex);
400 /* Return the actual frame period. */
401 timeperframe.numerator = probe.dwFrameInterval;
402 timeperframe.denominator = 10000000;
403 uvc_simplify_fraction(&timeperframe.numerator,
404 &timeperframe.denominator, 8, 333);
406 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
407 parm->parm.capture.timeperframe = timeperframe;
409 parm->parm.output.timeperframe = timeperframe;
414 /* ------------------------------------------------------------------------
415 * Privilege management
419 * Privilege management is the multiple-open implementation basis. The current
420 * implementation is completely transparent for the end-user and doesn't
421 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
422 * Those ioctls enable finer control on the device (by making possible for a
423 * user to request exclusive access to a device), but are not mature yet.
424 * Switching to the V4L2 priority mechanism might be considered in the future
425 * if this situation changes.
427 * Each open instance of a UVC device can either be in a privileged or
428 * unprivileged state. Only a single instance can be in a privileged state at
429 * a given time. Trying to perform an operation that requires privileges will
430 * automatically acquire the required privileges if possible, or return -EBUSY
431 * otherwise. Privileges are dismissed when closing the instance or when
432 * freeing the video buffers using VIDIOC_REQBUFS.
434 * Operations that require privileges are:
441 static int uvc_acquire_privileges(struct uvc_fh *handle)
443 /* Always succeed if the handle is already privileged. */
444 if (handle->state == UVC_HANDLE_ACTIVE)
447 /* Check if the device already has a privileged handle. */
448 if (atomic_inc_return(&handle->stream->active) != 1) {
449 atomic_dec(&handle->stream->active);
453 handle->state = UVC_HANDLE_ACTIVE;
457 static void uvc_dismiss_privileges(struct uvc_fh *handle)
459 if (handle->state == UVC_HANDLE_ACTIVE)
460 atomic_dec(&handle->stream->active);
462 handle->state = UVC_HANDLE_PASSIVE;
465 static int uvc_has_privileges(struct uvc_fh *handle)
467 return handle->state == UVC_HANDLE_ACTIVE;
470 /* ------------------------------------------------------------------------
471 * V4L2 file operations
474 static int uvc_v4l2_open(struct file *file)
476 struct uvc_streaming *stream;
477 struct uvc_fh *handle;
480 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
481 stream = video_drvdata(file);
483 if (stream->dev->state & UVC_DEV_DISCONNECTED)
486 ret = usb_autopm_get_interface(stream->dev->intf);
490 /* Create the device handle. */
491 handle = kzalloc(sizeof *handle, GFP_KERNEL);
492 if (handle == NULL) {
493 usb_autopm_put_interface(stream->dev->intf);
497 if (atomic_inc_return(&stream->dev->users) == 1) {
498 ret = uvc_status_start(stream->dev);
500 usb_autopm_put_interface(stream->dev->intf);
501 atomic_dec(&stream->dev->users);
507 handle->chain = stream->chain;
508 handle->stream = stream;
509 handle->state = UVC_HANDLE_PASSIVE;
510 file->private_data = handle;
515 static int uvc_v4l2_release(struct file *file)
517 struct uvc_fh *handle = file->private_data;
518 struct uvc_streaming *stream = handle->stream;
520 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
522 /* Only free resources if this is a privileged handle. */
523 if (uvc_has_privileges(handle)) {
524 uvc_video_enable(stream, 0);
526 if (uvc_free_buffers(&stream->queue) < 0)
527 uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
531 /* Release the file handle. */
532 uvc_dismiss_privileges(handle);
534 file->private_data = NULL;
536 if (atomic_dec_return(&stream->dev->users) == 0)
537 uvc_status_stop(stream->dev);
539 usb_autopm_put_interface(stream->dev->intf);
543 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
545 struct video_device *vdev = video_devdata(file);
546 struct uvc_fh *handle = file->private_data;
547 struct uvc_video_chain *chain = handle->chain;
548 struct uvc_streaming *stream = handle->stream;
552 /* Query capabilities */
553 case VIDIOC_QUERYCAP:
555 struct v4l2_capability *cap = arg;
557 memset(cap, 0, sizeof *cap);
558 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
559 strlcpy(cap->card, vdev->name, sizeof cap->card);
560 usb_make_path(stream->dev->udev,
561 cap->bus_info, sizeof(cap->bus_info));
562 cap->version = LINUX_VERSION_CODE;
563 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
564 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
565 | V4L2_CAP_STREAMING;
567 cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
568 | V4L2_CAP_STREAMING;
572 /* Get, Set & Query control */
573 case VIDIOC_QUERYCTRL:
574 return uvc_query_v4l2_ctrl(chain, arg);
578 struct v4l2_control *ctrl = arg;
579 struct v4l2_ext_control xctrl;
581 memset(&xctrl, 0, sizeof xctrl);
584 ret = uvc_ctrl_begin(chain);
588 ret = uvc_ctrl_get(chain, &xctrl);
589 uvc_ctrl_rollback(chain);
591 ctrl->value = xctrl.value;
597 struct v4l2_control *ctrl = arg;
598 struct v4l2_ext_control xctrl;
600 memset(&xctrl, 0, sizeof xctrl);
602 xctrl.value = ctrl->value;
604 ret = uvc_ctrl_begin(chain);
608 ret = uvc_ctrl_set(chain, &xctrl);
610 uvc_ctrl_rollback(chain);
613 ret = uvc_ctrl_commit(chain);
615 ctrl->value = xctrl.value;
619 case VIDIOC_QUERYMENU:
620 return uvc_query_v4l2_menu(chain, arg);
622 case VIDIOC_G_EXT_CTRLS:
624 struct v4l2_ext_controls *ctrls = arg;
625 struct v4l2_ext_control *ctrl = ctrls->controls;
628 ret = uvc_ctrl_begin(chain);
632 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
633 ret = uvc_ctrl_get(chain, ctrl);
635 uvc_ctrl_rollback(chain);
636 ctrls->error_idx = i;
640 ctrls->error_idx = 0;
641 ret = uvc_ctrl_rollback(chain);
645 case VIDIOC_S_EXT_CTRLS:
646 case VIDIOC_TRY_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_set(chain, ctrl);
659 uvc_ctrl_rollback(chain);
660 ctrls->error_idx = i;
665 ctrls->error_idx = 0;
667 if (cmd == VIDIOC_S_EXT_CTRLS)
668 ret = uvc_ctrl_commit(chain);
670 ret = uvc_ctrl_rollback(chain);
674 /* Get, Set & Enum input */
675 case VIDIOC_ENUMINPUT:
677 const struct uvc_entity *selector = chain->selector;
678 struct v4l2_input *input = arg;
679 struct uvc_entity *iterm = NULL;
680 u32 index = input->index;
683 if (selector == NULL ||
684 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
687 list_for_each_entry(iterm, &chain->entities, chain) {
688 if (UVC_ENTITY_IS_ITERM(iterm))
692 } else if (pin < selector->bNrInPins) {
693 pin = selector->baSourceID[index];
694 list_for_each_entry(iterm, &chain->entities, chain) {
695 if (!UVC_ENTITY_IS_ITERM(iterm))
697 if (iterm->id == pin)
702 if (iterm == NULL || iterm->id != pin)
705 memset(input, 0, sizeof *input);
706 input->index = index;
707 strlcpy(input->name, iterm->name, sizeof input->name);
708 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
709 input->type = V4L2_INPUT_TYPE_CAMERA;
717 if (chain->selector == NULL ||
718 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
723 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
724 chain->selector->id, chain->dev->intfnum,
725 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
729 *(int *)arg = input - 1;
735 u32 input = *(u32 *)arg + 1;
737 if ((ret = uvc_acquire_privileges(handle)) < 0)
740 if (chain->selector == NULL ||
741 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
747 if (input == 0 || input > chain->selector->bNrInPins)
750 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
751 chain->selector->id, chain->dev->intfnum,
752 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
755 /* Try, Get, Set & Enum format */
756 case VIDIOC_ENUM_FMT:
758 struct v4l2_fmtdesc *fmt = arg;
759 struct uvc_format *format;
760 enum v4l2_buf_type type = fmt->type;
761 __u32 index = fmt->index;
763 if (fmt->type != stream->type ||
764 fmt->index >= stream->nformats)
767 memset(fmt, 0, sizeof(*fmt));
771 format = &stream->format[fmt->index];
773 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
774 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
775 strlcpy(fmt->description, format->name,
776 sizeof fmt->description);
777 fmt->description[sizeof fmt->description - 1] = 0;
778 fmt->pixelformat = format->fcc;
784 struct uvc_streaming_control probe;
786 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
790 if ((ret = uvc_acquire_privileges(handle)) < 0)
793 return uvc_v4l2_set_format(stream, arg);
796 return uvc_v4l2_get_format(stream, arg);
798 /* Frame size enumeration */
799 case VIDIOC_ENUM_FRAMESIZES:
801 struct v4l2_frmsizeenum *fsize = arg;
802 struct uvc_format *format = NULL;
803 struct uvc_frame *frame;
806 /* Look for the given pixel format */
807 for (i = 0; i < stream->nformats; i++) {
808 if (stream->format[i].fcc ==
809 fsize->pixel_format) {
810 format = &stream->format[i];
817 if (fsize->index >= format->nframes)
820 frame = &format->frame[fsize->index];
821 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
822 fsize->discrete.width = frame->wWidth;
823 fsize->discrete.height = frame->wHeight;
827 /* Frame interval enumeration */
828 case VIDIOC_ENUM_FRAMEINTERVALS:
830 struct v4l2_frmivalenum *fival = arg;
831 struct uvc_format *format = NULL;
832 struct uvc_frame *frame = NULL;
835 /* Look for the given pixel format and frame size */
836 for (i = 0; i < stream->nformats; i++) {
837 if (stream->format[i].fcc ==
838 fival->pixel_format) {
839 format = &stream->format[i];
846 for (i = 0; i < format->nframes; i++) {
847 if (format->frame[i].wWidth == fival->width &&
848 format->frame[i].wHeight == fival->height) {
849 frame = &format->frame[i];
856 if (frame->bFrameIntervalType) {
857 if (fival->index >= frame->bFrameIntervalType)
860 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
861 fival->discrete.numerator =
862 frame->dwFrameInterval[fival->index];
863 fival->discrete.denominator = 10000000;
864 uvc_simplify_fraction(&fival->discrete.numerator,
865 &fival->discrete.denominator, 8, 333);
867 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
868 fival->stepwise.min.numerator =
869 frame->dwFrameInterval[0];
870 fival->stepwise.min.denominator = 10000000;
871 fival->stepwise.max.numerator =
872 frame->dwFrameInterval[1];
873 fival->stepwise.max.denominator = 10000000;
874 fival->stepwise.step.numerator =
875 frame->dwFrameInterval[2];
876 fival->stepwise.step.denominator = 10000000;
877 uvc_simplify_fraction(&fival->stepwise.min.numerator,
878 &fival->stepwise.min.denominator, 8, 333);
879 uvc_simplify_fraction(&fival->stepwise.max.numerator,
880 &fival->stepwise.max.denominator, 8, 333);
881 uvc_simplify_fraction(&fival->stepwise.step.numerator,
882 &fival->stepwise.step.denominator, 8, 333);
887 /* Get & Set streaming parameters */
889 return uvc_v4l2_get_streamparm(stream, arg);
892 if ((ret = uvc_acquire_privileges(handle)) < 0)
895 return uvc_v4l2_set_streamparm(stream, arg);
897 /* Cropping and scaling */
900 struct v4l2_cropcap *ccap = arg;
902 if (ccap->type != stream->type)
905 ccap->bounds.left = 0;
906 ccap->bounds.top = 0;
908 mutex_lock(&stream->mutex);
909 ccap->bounds.width = stream->cur_frame->wWidth;
910 ccap->bounds.height = stream->cur_frame->wHeight;
911 mutex_unlock(&stream->mutex);
913 ccap->defrect = ccap->bounds;
915 ccap->pixelaspect.numerator = 1;
916 ccap->pixelaspect.denominator = 1;
924 /* Buffers & streaming */
927 struct v4l2_requestbuffers *rb = arg;
929 if (rb->type != stream->type ||
930 rb->memory != V4L2_MEMORY_MMAP)
933 if ((ret = uvc_acquire_privileges(handle)) < 0)
936 mutex_lock(&stream->mutex);
937 ret = uvc_alloc_buffers(&stream->queue, rb->count,
938 stream->ctrl.dwMaxVideoFrameSize);
939 mutex_unlock(&stream->mutex);
944 uvc_dismiss_privileges(handle);
951 case VIDIOC_QUERYBUF:
953 struct v4l2_buffer *buf = arg;
955 if (buf->type != stream->type)
958 if (!uvc_has_privileges(handle))
961 return uvc_query_buffer(&stream->queue, buf);
965 if (!uvc_has_privileges(handle))
968 return uvc_queue_buffer(&stream->queue, arg);
971 if (!uvc_has_privileges(handle))
974 return uvc_dequeue_buffer(&stream->queue, arg,
975 file->f_flags & O_NONBLOCK);
977 case VIDIOC_STREAMON:
981 if (*type != stream->type)
984 if (!uvc_has_privileges(handle))
987 mutex_lock(&stream->mutex);
988 ret = uvc_video_enable(stream, 1);
989 mutex_unlock(&stream->mutex);
995 case VIDIOC_STREAMOFF:
999 if (*type != stream->type)
1002 if (!uvc_has_privileges(handle))
1005 return uvc_video_enable(stream, 0);
1008 /* Analog video standards make no sense for digital cameras. */
1009 case VIDIOC_ENUMSTD:
1010 case VIDIOC_QUERYSTD:
1014 case VIDIOC_OVERLAY:
1016 case VIDIOC_ENUMAUDIO:
1017 case VIDIOC_ENUMAUDOUT:
1019 case VIDIOC_ENUMOUTPUT:
1020 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1023 case UVCIOC_CTRL_MAP:
1024 return uvc_ioctl_ctrl_map(chain, arg);
1026 case UVCIOC_CTRL_QUERY:
1027 return uvc_xu_ctrl_query(chain, arg);
1030 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
1037 static long uvc_v4l2_ioctl(struct file *file,
1038 unsigned int cmd, unsigned long arg)
1040 if (uvc_trace_param & UVC_TRACE_IOCTL) {
1041 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1042 v4l_printk_ioctl(cmd);
1046 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1049 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1050 size_t count, loff_t *ppos)
1052 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1056 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1058 struct uvc_fh *handle = file->private_data;
1059 struct uvc_streaming *stream = handle->stream;
1061 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1063 return uvc_queue_mmap(&stream->queue, vma);
1066 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1068 struct uvc_fh *handle = file->private_data;
1069 struct uvc_streaming *stream = handle->stream;
1071 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1073 return uvc_queue_poll(&stream->queue, file, wait);
1077 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1078 unsigned long addr, unsigned long len, unsigned long pgoff,
1079 unsigned long flags)
1081 struct uvc_fh *handle = file->private_data;
1082 struct uvc_streaming *stream = handle->stream;
1084 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1086 return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1090 const struct v4l2_file_operations uvc_fops = {
1091 .owner = THIS_MODULE,
1092 .open = uvc_v4l2_open,
1093 .release = uvc_v4l2_release,
1094 .unlocked_ioctl = uvc_v4l2_ioctl,
1095 .read = uvc_v4l2_read,
1096 .mmap = uvc_v4l2_mmap,
1097 .poll = uvc_v4l2_poll,
1099 .get_unmapped_area = uvc_v4l2_get_unmapped_area,