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uvc_v4l2.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* uvc_v4l2.c -- USB Video Class driver - V4L2 API
*
* Copyright (C) 2005-2010
* Laurent Pinchart ([email protected])
*/
#include <linux/bits.h>
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/wait.h>
#include <linux/atomic.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-ioctl.h>
#include "uvcvideo.h"
static int uvc_control_add_xu_mapping(struct uvc_video_chain *chain,
struct uvc_control_mapping *map,
const struct uvc_xu_control_mapping *xmap)
{
unsigned int i;
size_t size;
int ret;
/*
* Prevent excessive memory consumption, as well as integer
* overflows.
*/
if (xmap->menu_count == 0 ||
xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES)
return -EINVAL;
map->menu_names = NULL;
map->menu_mapping = NULL;
map->menu_mask = GENMASK(xmap->menu_count - 1, 0);
size = xmap->menu_count * sizeof(*map->menu_mapping);
map->menu_mapping = kzalloc(size, GFP_KERNEL);
if (!map->menu_mapping) {
ret = -ENOMEM;
goto done;
}
for (i = 0; i < xmap->menu_count ; i++) {
if (copy_from_user((u32 *)&map->menu_mapping[i],
&xmap->menu_info[i].value,
sizeof(map->menu_mapping[i]))) {
ret = -EACCES;
goto done;
}
}
/*
* Always use the standard naming if available, otherwise copy the
* names supplied by userspace.
*/
if (!v4l2_ctrl_get_menu(map->id)) {
size = xmap->menu_count * sizeof(map->menu_names[0]);
map->menu_names = kzalloc(size, GFP_KERNEL);
if (!map->menu_names) {
ret = -ENOMEM;
goto done;
}
for (i = 0; i < xmap->menu_count ; i++) {
/* sizeof(names[i]) - 1: to take care of \0 */
if (copy_from_user((char *)map->menu_names[i],
xmap->menu_info[i].name,
sizeof(map->menu_names[i]) - 1)) {
ret = -EACCES;
goto done;
}
}
}
ret = uvc_ctrl_add_mapping(chain, map);
done:
kfree(map->menu_names);
map->menu_names = NULL;
kfree(map->menu_mapping);
map->menu_mapping = NULL;
return ret;
}
/* ------------------------------------------------------------------------
* UVC ioctls
*/
static int uvc_ioctl_xu_ctrl_map(struct uvc_video_chain *chain,
struct uvc_xu_control_mapping *xmap)
{
struct uvc_control_mapping *map;
int ret;
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (map == NULL)
return -ENOMEM;
map->id = xmap->id;
/* Non standard control id. */
if (v4l2_ctrl_get_name(map->id) == NULL) {
if (xmap->name[0] == '\0') {
ret = -EINVAL;
goto free_map;
}
xmap->name[sizeof(xmap->name) - 1] = '\0';
map->name = xmap->name;
}
memcpy(map->entity, xmap->entity, sizeof(map->entity));
map->selector = xmap->selector;
map->size = xmap->size;
map->offset = xmap->offset;
map->v4l2_type = xmap->v4l2_type;
map->data_type = xmap->data_type;
switch (xmap->v4l2_type) {
case V4L2_CTRL_TYPE_INTEGER:
case V4L2_CTRL_TYPE_BOOLEAN:
case V4L2_CTRL_TYPE_BUTTON:
ret = uvc_ctrl_add_mapping(chain, map);
break;
case V4L2_CTRL_TYPE_MENU:
ret = uvc_control_add_xu_mapping(chain, map, xmap);
break;
default:
uvc_dbg(chain->dev, CONTROL,
"Unsupported V4L2 control type %u\n", xmap->v4l2_type);
ret = -ENOTTY;
break;
}
free_map:
kfree(map);
return ret;
}
/* ------------------------------------------------------------------------
* V4L2 interface
*/
/*
* Find the frame interval closest to the requested frame interval for the
* given frame format and size. This should be done by the device as part of
* the Video Probe and Commit negotiation, but some hardware don't implement
* that feature.
*/
static u32 uvc_try_frame_interval(const struct uvc_frame *frame, u32 interval)
{
unsigned int i;
if (frame->bFrameIntervalType) {
u32 best = -1, dist;
for (i = 0; i < frame->bFrameIntervalType; ++i) {
dist = interval > frame->dwFrameInterval[i]
? interval - frame->dwFrameInterval[i]
: frame->dwFrameInterval[i] - interval;
if (dist > best)
break;
best = dist;
}
interval = frame->dwFrameInterval[i-1];
} else {
const u32 min = frame->dwFrameInterval[0];
const u32 max = frame->dwFrameInterval[1];
const u32 step = frame->dwFrameInterval[2];
interval = min + (interval - min + step/2) / step * step;
if (interval > max)
interval = max;
}
return interval;
}
static u32 uvc_v4l2_get_bytesperline(const struct uvc_format *format,
const struct uvc_frame *frame)
{
switch (format->fcc) {
case V4L2_PIX_FMT_NV12:
case V4L2_PIX_FMT_YVU420:
case V4L2_PIX_FMT_YUV420:
case V4L2_PIX_FMT_M420:
return frame->wWidth;
default:
return format->bpp * frame->wWidth / 8;
}
}
static int uvc_v4l2_try_format(struct uvc_streaming *stream,
struct v4l2_format *fmt, struct uvc_streaming_control *probe,
const struct uvc_format **uvc_format,
const struct uvc_frame **uvc_frame)
{
const struct uvc_format *format = NULL;
const struct uvc_frame *frame = NULL;
u16 rw, rh;
unsigned int d, maxd;
unsigned int i;
u32 interval;
int ret = 0;
u8 *fcc;
if (fmt->type != stream->type)
return -EINVAL;
fcc = (u8 *)&fmt->fmt.pix.pixelformat;
uvc_dbg(stream->dev, FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u\n",
fmt->fmt.pix.pixelformat,
fcc[0], fcc[1], fcc[2], fcc[3],
fmt->fmt.pix.width, fmt->fmt.pix.height);
/*
* Check if the hardware supports the requested format, use the default
* format otherwise.
*/
for (i = 0; i < stream->nformats; ++i) {
format = &stream->formats[i];
if (format->fcc == fmt->fmt.pix.pixelformat)
break;
}
if (i == stream->nformats) {
format = stream->def_format;
fmt->fmt.pix.pixelformat = format->fcc;
}
/*
* Find the closest image size. The distance between image sizes is
* the size in pixels of the non-overlapping regions between the
* requested size and the frame-specified size.
*/
rw = fmt->fmt.pix.width;
rh = fmt->fmt.pix.height;
maxd = (unsigned int)-1;
for (i = 0; i < format->nframes; ++i) {
u16 w = format->frames[i].wWidth;
u16 h = format->frames[i].wHeight;
d = min(w, rw) * min(h, rh);
d = w*h + rw*rh - 2*d;
if (d < maxd) {
maxd = d;
frame = &format->frames[i];
}
if (maxd == 0)
break;
}
if (frame == NULL) {
uvc_dbg(stream->dev, FORMAT, "Unsupported size %ux%u\n",
fmt->fmt.pix.width, fmt->fmt.pix.height);
return -EINVAL;
}
/* Use the default frame interval. */
interval = frame->dwDefaultFrameInterval;
uvc_dbg(stream->dev, FORMAT,
"Using default frame interval %u.%u us (%u.%u fps)\n",
interval / 10, interval % 10, 10000000 / interval,
(100000000 / interval) % 10);
/* Set the format index, frame index and frame interval. */
memset(probe, 0, sizeof(*probe));
probe->bmHint = 1; /* dwFrameInterval */
probe->bFormatIndex = format->index;
probe->bFrameIndex = frame->bFrameIndex;
probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
/*
* Some webcams stall the probe control set request when the
* dwMaxVideoFrameSize field is set to zero. The UVC specification
* clearly states that the field is read-only from the host, so this
* is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
* the webcam to work around the problem.
*
* The workaround could probably be enabled for all webcams, so the
* quirk can be removed if needed. It's currently useful to detect
* webcam bugs and fix them before they hit the market (providing
* developers test their webcams with the Linux driver as well as with
* the Windows driver).
*/
mutex_lock(&stream->mutex);
if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
probe->dwMaxVideoFrameSize =
stream->ctrl.dwMaxVideoFrameSize;
/* Probe the device. */
ret = uvc_probe_video(stream, probe);
mutex_unlock(&stream->mutex);
if (ret < 0)
return ret;
/*
* After the probe, update fmt with the values returned from
* negotiation with the device. Some devices return invalid bFormatIndex
* and bFrameIndex values, in which case we can only assume they have
* accepted the requested format as-is.
*/
for (i = 0; i < stream->nformats; ++i) {
if (probe->bFormatIndex == stream->formats[i].index) {
format = &stream->formats[i];
break;
}
}
if (i == stream->nformats)
uvc_dbg(stream->dev, FORMAT,
"Unknown bFormatIndex %u, using default\n",
probe->bFormatIndex);
for (i = 0; i < format->nframes; ++i) {
if (probe->bFrameIndex == format->frames[i].bFrameIndex) {
frame = &format->frames[i];
break;
}
}
if (i == format->nframes)
uvc_dbg(stream->dev, FORMAT,
"Unknown bFrameIndex %u, using default\n",
probe->bFrameIndex);
fmt->fmt.pix.width = frame->wWidth;
fmt->fmt.pix.height = frame->wHeight;
fmt->fmt.pix.field = V4L2_FIELD_NONE;
fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
fmt->fmt.pix.pixelformat = format->fcc;
fmt->fmt.pix.colorspace = format->colorspace;
fmt->fmt.pix.xfer_func = format->xfer_func;
fmt->fmt.pix.ycbcr_enc = format->ycbcr_enc;
if (uvc_format != NULL)
*uvc_format = format;
if (uvc_frame != NULL)
*uvc_frame = frame;
return ret;
}
static int uvc_v4l2_get_format(struct uvc_streaming *stream,
struct v4l2_format *fmt)
{
const struct uvc_format *format;
const struct uvc_frame *frame;
int ret = 0;
if (fmt->type != stream->type)
return -EINVAL;
mutex_lock(&stream->mutex);
format = stream->cur_format;
frame = stream->cur_frame;
if (format == NULL || frame == NULL) {
ret = -EINVAL;
goto done;
}
fmt->fmt.pix.pixelformat = format->fcc;
fmt->fmt.pix.width = frame->wWidth;
fmt->fmt.pix.height = frame->wHeight;
fmt->fmt.pix.field = V4L2_FIELD_NONE;
fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
fmt->fmt.pix.colorspace = format->colorspace;
fmt->fmt.pix.xfer_func = format->xfer_func;
fmt->fmt.pix.ycbcr_enc = format->ycbcr_enc;
done:
mutex_unlock(&stream->mutex);
return ret;
}
static int uvc_v4l2_set_format(struct uvc_streaming *stream,
struct v4l2_format *fmt)
{
struct uvc_streaming_control probe;
const struct uvc_format *format;
const struct uvc_frame *frame;
int ret;
if (fmt->type != stream->type)
return -EINVAL;
ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
if (ret < 0)
return ret;
mutex_lock(&stream->mutex);
if (uvc_queue_allocated(&stream->queue)) {
ret = -EBUSY;
goto done;
}
stream->ctrl = probe;
stream->cur_format = format;
stream->cur_frame = frame;
done:
mutex_unlock(&stream->mutex);
return ret;
}
static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
struct v4l2_streamparm *parm)
{
u32 numerator, denominator;
if (parm->type != stream->type)
return -EINVAL;
mutex_lock(&stream->mutex);
numerator = stream->ctrl.dwFrameInterval;
mutex_unlock(&stream->mutex);
denominator = 10000000;
v4l2_simplify_fraction(&numerator, &denominator, 8, 333);
memset(parm, 0, sizeof(*parm));
parm->type = stream->type;
if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
parm->parm.capture.capturemode = 0;
parm->parm.capture.timeperframe.numerator = numerator;
parm->parm.capture.timeperframe.denominator = denominator;
parm->parm.capture.extendedmode = 0;
parm->parm.capture.readbuffers = 0;
} else {
parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
parm->parm.output.outputmode = 0;
parm->parm.output.timeperframe.numerator = numerator;
parm->parm.output.timeperframe.denominator = denominator;
}
return 0;
}
static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
struct v4l2_streamparm *parm)
{
struct uvc_streaming_control probe;
struct v4l2_fract timeperframe;
const struct uvc_format *format;
const struct uvc_frame *frame;
u32 interval, maxd;
unsigned int i;
int ret;
if (parm->type != stream->type)
return -EINVAL;
if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
timeperframe = parm->parm.capture.timeperframe;
else
timeperframe = parm->parm.output.timeperframe;
interval = v4l2_fraction_to_interval(timeperframe.numerator,
timeperframe.denominator);
uvc_dbg(stream->dev, FORMAT, "Setting frame interval to %u/%u (%u)\n",
timeperframe.numerator, timeperframe.denominator, interval);
mutex_lock(&stream->mutex);
if (uvc_queue_streaming(&stream->queue)) {
mutex_unlock(&stream->mutex);
return -EBUSY;
}
format = stream->cur_format;
frame = stream->cur_frame;
probe = stream->ctrl;
probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
maxd = abs((s32)probe.dwFrameInterval - interval);
/* Try frames with matching size to find the best frame interval. */
for (i = 0; i < format->nframes && maxd != 0; i++) {
u32 d, ival;
if (&format->frames[i] == stream->cur_frame)
continue;
if (format->frames[i].wWidth != stream->cur_frame->wWidth ||
format->frames[i].wHeight != stream->cur_frame->wHeight)
continue;
ival = uvc_try_frame_interval(&format->frames[i], interval);
d = abs((s32)ival - interval);
if (d >= maxd)
continue;
frame = &format->frames[i];
probe.bFrameIndex = frame->bFrameIndex;
probe.dwFrameInterval = ival;
maxd = d;
}
/* Probe the device with the new settings. */
ret = uvc_probe_video(stream, &probe);
if (ret < 0) {
mutex_unlock(&stream->mutex);
return ret;
}
stream->ctrl = probe;
stream->cur_frame = frame;
mutex_unlock(&stream->mutex);
/* Return the actual frame period. */
timeperframe.numerator = probe.dwFrameInterval;
timeperframe.denominator = 10000000;
v4l2_simplify_fraction(&timeperframe.numerator,
&timeperframe.denominator, 8, 333);
if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
parm->parm.capture.timeperframe = timeperframe;
parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
} else {
parm->parm.output.timeperframe = timeperframe;
parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
}
return 0;
}
/* ------------------------------------------------------------------------
* Privilege management
*/
/*
* Privilege management is the multiple-open implementation basis. The current
* implementation is completely transparent for the end-user and doesn't
* require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
* Those ioctls enable finer control on the device (by making possible for a
* user to request exclusive access to a device), but are not mature yet.
* Switching to the V4L2 priority mechanism might be considered in the future
* if this situation changes.
*
* Each open instance of a UVC device can either be in a privileged or
* unprivileged state. Only a single instance can be in a privileged state at
* a given time. Trying to perform an operation that requires privileges will
* automatically acquire the required privileges if possible, or return -EBUSY
* otherwise. Privileges are dismissed when closing the instance or when
* freeing the video buffers using VIDIOC_REQBUFS.
*
* Operations that require privileges are:
*
* - VIDIOC_S_INPUT
* - VIDIOC_S_PARM
* - VIDIOC_S_FMT
* - VIDIOC_REQBUFS
*/
static int uvc_acquire_privileges(struct uvc_fh *handle)
{
/* Always succeed if the handle is already privileged. */
if (handle->state == UVC_HANDLE_ACTIVE)
return 0;
/* Check if the device already has a privileged handle. */
if (atomic_inc_return(&handle->stream->active) != 1) {
atomic_dec(&handle->stream->active);
return -EBUSY;
}
handle->state = UVC_HANDLE_ACTIVE;
return 0;
}
static void uvc_dismiss_privileges(struct uvc_fh *handle)
{
if (handle->state == UVC_HANDLE_ACTIVE)
atomic_dec(&handle->stream->active);
handle->state = UVC_HANDLE_PASSIVE;
}
static int uvc_has_privileges(struct uvc_fh *handle)
{
return handle->state == UVC_HANDLE_ACTIVE;
}
/* ------------------------------------------------------------------------
* V4L2 file operations
*/
static int uvc_v4l2_open(struct file *file)
{
struct uvc_streaming *stream;
struct uvc_fh *handle;
int ret = 0;
stream = video_drvdata(file);
uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
ret = usb_autopm_get_interface(stream->dev->intf);
if (ret < 0)
return ret;
/* Create the device handle. */
handle = kzalloc(sizeof(*handle), GFP_KERNEL);
if (handle == NULL) {
usb_autopm_put_interface(stream->dev->intf);
return -ENOMEM;
}
mutex_lock(&stream->dev->lock);
if (stream->dev->users == 0) {
ret = uvc_status_start(stream->dev, GFP_KERNEL);
if (ret < 0) {
mutex_unlock(&stream->dev->lock);
usb_autopm_put_interface(stream->dev->intf);
kfree(handle);
return ret;
}
}
stream->dev->users++;
mutex_unlock(&stream->dev->lock);
v4l2_fh_init(&handle->vfh, &stream->vdev);
v4l2_fh_add(&handle->vfh);
handle->chain = stream->chain;
handle->stream = stream;
handle->state = UVC_HANDLE_PASSIVE;
file->private_data = handle;
return 0;
}
static int uvc_v4l2_release(struct file *file)
{
struct uvc_fh *handle = file->private_data;
struct uvc_streaming *stream = handle->stream;
uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
/* Only free resources if this is a privileged handle. */
if (uvc_has_privileges(handle))
uvc_queue_release(&stream->queue);
/* Release the file handle. */
uvc_dismiss_privileges(handle);
v4l2_fh_del(&handle->vfh);
v4l2_fh_exit(&handle->vfh);
kfree(handle);
file->private_data = NULL;
mutex_lock(&stream->dev->lock);
if (--stream->dev->users == 0)
uvc_status_stop(stream->dev);
mutex_unlock(&stream->dev->lock);
usb_autopm_put_interface(stream->dev->intf);
return 0;
}
static int uvc_ioctl_querycap(struct file *file, void *fh,
struct v4l2_capability *cap)
{
struct uvc_fh *handle = file->private_data;
struct uvc_video_chain *chain = handle->chain;
struct uvc_streaming *stream = handle->stream;
strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
strscpy(cap->card, handle->stream->dev->name, sizeof(cap->card));
usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
| chain->caps;
return 0;
}
static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
struct v4l2_fmtdesc *fmt)
{
const struct uvc_format *format;
enum v4l2_buf_type type = fmt->type;
u32 index = fmt->index;
if (fmt->type != stream->type || fmt->index >= stream->nformats)
return -EINVAL;
memset(fmt, 0, sizeof(*fmt));
fmt->index = index;
fmt->type = type;
format = &stream->formats[fmt->index];
fmt->flags = 0;
if (format->flags & UVC_FMT_FLAG_COMPRESSED)
fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
fmt->pixelformat = format->fcc;
return 0;
}
static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
struct v4l2_fmtdesc *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_ioctl_enum_fmt(stream, fmt);
}
static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
struct v4l2_fmtdesc *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_ioctl_enum_fmt(stream, fmt);
}
static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_v4l2_get_format(stream, fmt);
}
static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_v4l2_get_format(stream, fmt);
}
static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
return uvc_v4l2_set_format(stream, fmt);
}
static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
return uvc_v4l2_set_format(stream, fmt);
}
static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
struct uvc_streaming_control probe;
return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
}
static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
struct uvc_streaming_control probe;
return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
}
static int uvc_ioctl_reqbufs(struct file *file, void *fh,
struct v4l2_requestbuffers *rb)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
mutex_lock(&stream->mutex);
ret = uvc_request_buffers(&stream->queue, rb);
mutex_unlock(&stream->mutex);
if (ret < 0)
return ret;
if (ret == 0)
uvc_dismiss_privileges(handle);
return 0;
}
static int uvc_ioctl_querybuf(struct file *file, void *fh,
struct v4l2_buffer *buf)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_query_buffer(&stream->queue, buf);
}
static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_queue_buffer(&stream->queue,
stream->vdev.v4l2_dev->mdev, buf);
}
static int uvc_ioctl_expbuf(struct file *file, void *fh,
struct v4l2_exportbuffer *exp)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_export_buffer(&stream->queue, exp);
}
static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_dequeue_buffer(&stream->queue, buf,
file->f_flags & O_NONBLOCK);
}
static int uvc_ioctl_create_bufs(struct file *file, void *fh,
struct v4l2_create_buffers *cb)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
return uvc_create_buffers(&stream->queue, cb);
}
static int uvc_ioctl_streamon(struct file *file, void *fh,
enum v4l2_buf_type type)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
if (!uvc_has_privileges(handle))
return -EBUSY;
mutex_lock(&stream->mutex);
ret = uvc_queue_streamon(&stream->queue, type);
mutex_unlock(&stream->mutex);
return ret;
}
static int uvc_ioctl_streamoff(struct file *file, void *fh,
enum v4l2_buf_type type)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
mutex_lock(&stream->mutex);
uvc_queue_streamoff(&stream->queue, type);
mutex_unlock(&stream->mutex);
return 0;
}
static int uvc_ioctl_enum_input(struct file *file, void *fh,
struct v4l2_input *input)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
const struct uvc_entity *selector = chain->selector;
struct uvc_entity *iterm = NULL;
struct uvc_entity *it;
u32 index = input->index;
if (selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
if (index != 0)
return -EINVAL;
list_for_each_entry(it, &chain->entities, chain) {
if (UVC_ENTITY_IS_ITERM(it)) {
iterm = it;
break;
}
}
} else if (index < selector->bNrInPins) {
list_for_each_entry(it, &chain->entities, chain) {
if (!UVC_ENTITY_IS_ITERM(it))
continue;
if (it->id == selector->baSourceID[index]) {
iterm = it;
break;
}
}
}
if (iterm == NULL)
return -EINVAL;
memset(input, 0, sizeof(*input));
input->index = index;
strscpy(input->name, iterm->name, sizeof(input->name));
if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
input->type = V4L2_INPUT_TYPE_CAMERA;
return 0;
}
static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
u8 *buf;
int ret;
if (chain->selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
*input = 0;
return 0;
}
buf = kmalloc(1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
buf, 1);
if (!ret)
*input = *buf - 1;
kfree(buf);
return ret;
}
static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
u8 *buf;
int ret;
ret = uvc_acquire_privileges(handle);