/*
* uvc_v4l2.c -- USB Video Class driver - V4L2 API
*
* Copyright (C) 2005-2010
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/version.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"
/* ------------------------------------------------------------------------
* UVC ioctls
*/
static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
struct uvc_xu_control_mapping *xmap)
{
struct uvc_control_mapping *map;
unsigned int size;
int ret;
map = kzalloc(sizeof *map, GFP_KERNEL);
if (map == NULL)
return -ENOMEM;
map->id = xmap->id;
memcpy(map->name, xmap->name, sizeof map->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:
break;
case V4L2_CTRL_TYPE_MENU:
/* Prevent excessive memory consumption, as well as integer
* overflows.
*/
if (xmap->menu_count == 0 ||
xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
ret = -EINVAL;
goto done;
}
size = xmap->menu_count * sizeof(*map->menu_info);
map->menu_info = kmalloc(size, GFP_KERNEL);
if (map->menu_info == NULL) {
ret = -ENOMEM;
goto done;
}
if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
ret = -EFAULT;
goto done;
}
map->menu_count = xmap->menu_count;
break;
default:
uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
"%u.\n", xmap->v4l2_type);
ret = -ENOTTY;
goto done;
}
ret = uvc_ctrl_add_mapping(chain, map);
done:
kfree(map->menu_info);
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(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 int uvc_v4l2_try_format(struct uvc_streaming *stream,
struct v4l2_format *fmt, struct uvc_streaming_control *probe,
struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
{
struct uvc_format *format = NULL;
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_trace(UVC_TRACE_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->format[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->frame[i].wWidth;
__u16 h = format->frame[i].wHeight;
d = min(w, rw) * min(h, rh);
d = w*h + rw*rh - 2*d;
if (d < maxd) {
maxd = d;
frame = &format->frame[i];
}
if (maxd == 0)
break;
}
if (frame == NULL) {
uvc_trace(UVC_TRACE_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_trace(UVC_TRACE_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)
goto done;
fmt->fmt.pix.width = frame->wWidth;
fmt->fmt.pix.height = frame->wHeight;
fmt->fmt.pix.field = V4L2_FIELD_NONE;
fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
fmt->fmt.pix.colorspace = format->colorspace;
fmt->fmt.pix.priv = 0;
if (uvc_format != NULL)
*uvc_format = format;
if (uvc_frame != NULL)
*uvc_frame = frame;
done:
return ret;
}
static int uvc_v4l2_get_format(struct uvc_streaming *stream,
struct v4l2_format *fmt)
{
struct uvc_format *format;
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 = format->bpp * frame->wWidth / 8;
fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
fmt->fmt.pix.colorspace = format->colorspace;
fmt->fmt.pix.priv = 0;
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;
struct uvc_format *format;
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)
{
uint32_t numerator, denominator;
if (parm->type != stream->type)
return -EINVAL;
mutex_lock(&stream->mutex);
numerator = stream->ctrl.dwFrameInterval;
mutex_unlock(&stream->mutex);
denominator = 10000000;
uvc_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;
uint32_t interval;
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 = uvc_fraction_to_interval(timeperframe.numerator,
timeperframe.denominator);
uvc_trace(UVC_TRACE_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;
}
probe = stream->ctrl;
probe.dwFrameInterval =
uvc_try_frame_interval(stream->cur_frame, interval);
/* 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;
mutex_unlock(&stream->mutex);
/* Return the actual frame period. */
timeperframe.numerator = probe.dwFrameInterval;
timeperframe.denominator = 10000000;
uvc_simplify_fraction(&timeperframe.numerator,
&timeperframe.denominator, 8, 333);
if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
parm->parm.capture.timeperframe = timeperframe;
else
parm->parm.output.timeperframe = 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;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
stream = video_drvdata(file);
if (stream->dev->state & UVC_DEV_DISCONNECTED)
return -ENODEV;
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_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
/* Only free resources if this is a privileged handle. */
if (uvc_has_privileges(handle)) {
uvc_video_enable(stream, 0);
uvc_free_buffers(&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 long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
{
struct video_device *vdev = video_devdata(file);
struct uvc_fh *handle = file->private_data;
struct uvc_video_chain *chain = handle->chain;
struct uvc_streaming *stream = handle->stream;
long ret = 0;
switch (cmd) {
/* Query capabilities */
case VIDIOC_QUERYCAP:
{
struct v4l2_capability *cap = arg;
memset(cap, 0, sizeof *cap);
strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
strlcpy(cap->card, vdev->name, sizeof cap->card);
usb_make_path(stream->dev->udev,
cap->bus_info, sizeof(cap->bus_info));
cap->version = LINUX_VERSION_CODE;
cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
| chain->caps;
if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
| V4L2_CAP_STREAMING;
else
cap->device_caps = V4L2_CAP_VIDEO_OUTPUT
| V4L2_CAP_STREAMING;
break;
}
/* Priority */
case VIDIOC_G_PRIORITY:
*(u32 *)arg = v4l2_prio_max(vdev->prio);
break;
case VIDIOC_S_PRIORITY:
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
return v4l2_prio_change(vdev->prio, &handle->vfh.prio,
*(u32 *)arg);
/* Get, Set & Query control */
case VIDIOC_QUERYCTRL:
return uvc_query_v4l2_ctrl(chain, arg);
case VIDIOC_G_CTRL:
{
struct v4l2_control *ctrl = arg;
struct v4l2_ext_control xctrl;
memset(&xctrl, 0, sizeof xctrl);
xctrl.id = ctrl->id;
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
ret = uvc_ctrl_get(chain, &xctrl);
uvc_ctrl_rollback(handle);
if (ret >= 0)
ctrl->value = xctrl.value;
break;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *ctrl = arg;
struct v4l2_ext_control xctrl;
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
memset(&xctrl, 0, sizeof xctrl);
xctrl.id = ctrl->id;
xctrl.value = ctrl->value;
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
ret = uvc_ctrl_set(chain, &xctrl);
if (ret < 0) {
uvc_ctrl_rollback(handle);
return ret;
}
ret = uvc_ctrl_commit(handle, &xctrl, 1);
if (ret == 0)
ctrl->value = xctrl.value;
break;
}
case VIDIOC_QUERYMENU:
return uvc_query_v4l2_menu(chain, arg);
case VIDIOC_G_EXT_CTRLS:
{
struct v4l2_ext_controls *ctrls = arg;
struct v4l2_ext_control *ctrl = ctrls->controls;
unsigned int i;
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
ret = uvc_ctrl_get(chain, ctrl);
if (ret < 0) {
uvc_ctrl_rollback(handle);
ctrls->error_idx = i;
return ret;
}
}
ctrls->error_idx = 0;
ret = uvc_ctrl_rollback(handle);
break;
}
case VIDIOC_S_EXT_CTRLS:
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
/* Fall through */
case VIDIOC_TRY_EXT_CTRLS:
{
struct v4l2_ext_controls *ctrls = arg;
struct v4l2_ext_control *ctrl = ctrls->controls;
unsigned int i;
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
ret = uvc_ctrl_set(chain, ctrl);
if (ret < 0) {
uvc_ctrl_rollback(handle);
ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS
? ctrls->count : i;
return ret;
}
}
ctrls->error_idx = 0;
if (cmd == VIDIOC_S_EXT_CTRLS)
ret = uvc_ctrl_commit(handle,
ctrls->controls, ctrls->count);
else
ret = uvc_ctrl_rollback(handle);
break;
}
/* Get, Set & Enum input */
case VIDIOC_ENUMINPUT:
{
const struct uvc_entity *selector = chain->selector;
struct v4l2_input *input = arg;
struct uvc_entity *iterm = NULL;
u32 index = input->index;
int pin = 0;
if (selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
if (index != 0)
return -EINVAL;
list_for_each_entry(iterm, &chain->entities, chain) {
if (UVC_ENTITY_IS_ITERM(iterm))
break;
}
pin = iterm->id;
} else if (index < selector->bNrInPins) {
pin = selector->baSourceID[index];
list_for_each_entry(iterm, &chain->entities, chain) {
if (!UVC_ENTITY_IS_ITERM(iterm))
continue;
if (iterm->id == pin)
break;
}
}
if (iterm == NULL || iterm->id != pin)
return -EINVAL;
memset(input, 0, sizeof *input);
input->index = index;
strlcpy(input->name, iterm->name, sizeof input->name);
if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
input->type = V4L2_INPUT_TYPE_CAMERA;
break;
}
case VIDIOC_G_INPUT:
{
u8 input;
if (chain->selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
*(int *)arg = 0;
break;
}
ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
chain->selector->id, chain->dev->intfnum,
UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
if (ret < 0)
return ret;
*(int *)arg = input - 1;
break;
}
case VIDIOC_S_INPUT:
{
u32 input = *(u32 *)arg + 1;
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
if (chain->selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
if (input != 1)
return -EINVAL;
break;
}
if (input == 0 || input > chain->selector->bNrInPins)
return -EINVAL;
return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
chain->selector->id, chain->dev->intfnum,
UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
}
/* Try, Get, Set & Enum format */
case VIDIOC_ENUM_FMT:
{
struct v4l2_fmtdesc *fmt = arg;
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->format[fmt->index];
fmt->flags = 0;
if (format->flags & UVC_FMT_FLAG_COMPRESSED)
fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
strlcpy(fmt->description, format->name,
sizeof fmt->description);
fmt->description[sizeof fmt->description - 1] = 0;
fmt->pixelformat = format->fcc;
break;
}
case VIDIOC_TRY_FMT:
{
struct uvc_streaming_control probe;
return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
}
case VIDIOC_S_FMT:
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
return uvc_v4l2_set_format(stream, arg);
case VIDIOC_G_FMT:
return uvc_v4l2_get_format(stream, arg);
/* Frame size enumeration */
case VIDIOC_ENUM_FRAMESIZES:
{
struct v4l2_frmsizeenum *fsize = arg;
struct uvc_format *format = NULL;
struct uvc_frame *frame;
int i;
/* Look for the given pixel format */
for (i = 0; i < stream->nformats; i++) {
if (stream->format[i].fcc ==
fsize->pixel_format) {
format = &stream->format[i];
break;
}
}
if (format == NULL)
return -EINVAL;
if (fsize->index >= format->nframes)
return -EINVAL;
frame = &format->frame[fsize->index];
fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
fsize->discrete.width = frame->wWidth;
fsize->discrete.height = frame->wHeight;
break;
}
/* Frame interval enumeration */
case VIDIOC_ENUM_FRAMEINTERVALS:
{
struct v4l2_frmivalenum *fival = arg;
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
int i;
/* Look for the given pixel format and frame size */
for (i = 0; i < stream->nformats; i++) {
if (stream->format[i].fcc ==
fival->pixel_format) {
format = &stream->format[i];
break;
}
}
if (format == NULL)
return -EINVAL;
for (i = 0; i < format->nframes; i++) {
if (format->frame[i].wWidth == fival->width &&
format->frame[i].wHeight == fival->height) {
frame = &format->frame[i];
break;
}
}
if (frame == NULL)
return -EINVAL;
if (frame->bFrameIntervalType) {
if (fival->index >= frame->bFrameIntervalType)
return -EINVAL;
fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
fival->discrete.numerator =
frame->dwFrameInterval[fival->index];
fival->discrete.denominator = 10000000;
uvc_simplify_fraction(&fival->discrete.numerator,
&fival->discrete.denominator, 8, 333);
} else {
fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
fival->stepwise.min.numerator =
frame->dwFrameInterval[0];
fival->stepwise.min.denominator = 10000000;
fival->stepwise.max.numerator =
frame->dwFrameInterval[1];
fival->stepwise.max.denominator = 10000000;
fival->stepwise.step.numerator =
frame->dwFrameInterval[2];
fival->stepwise.step.denominator = 10000000;
uvc_simplify_fraction(&fival->stepwise.min.numerator,
&fival->stepwise.min.denominator, 8, 333);
uvc_simplify_fraction(&fival->stepwise.max.numerator,
&fival->stepwise.max.denominator, 8, 333);
uvc_simplify_fraction(&fival->stepwise.step.numerator,
&fival->stepwise.step.denominator, 8, 333);
}
break;
}
/* Get & Set streaming parameters */
case VIDIOC_G_PARM:
return uvc_v4l2_get_streamparm(stream, arg);
case VIDIOC_S_PARM:
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
return uvc_v4l2_set_streamparm(stream, arg);
/* Cropping and scaling */
case VIDIOC_CROPCAP:
{
struct v4l2_cropcap *ccap = arg;
if (ccap->type != stream->type)
return -EINVAL;
ccap->bounds.left = 0;
ccap->bounds.top = 0;
mutex_lock(&stream->mutex);
ccap->bounds.width = stream->cur_frame->wWidth;
ccap->bounds.height = stream->cur_frame->wHeight;
mutex_unlock(&stream->mutex);
ccap->defrect = ccap->bounds;
ccap->pixelaspect.numerator = 1;
ccap->pixelaspect.denominator = 1;
break;
}
case VIDIOC_G_CROP:
case VIDIOC_S_CROP:
return -ENOTTY;
/* Buffers & streaming */
case VIDIOC_REQBUFS:
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
mutex_lock(&stream->mutex);
ret = uvc_alloc_buffers(&stream->queue, arg);
mutex_unlock(&stream->mutex);
if (ret < 0)
return ret;
if (ret == 0)
uvc_dismiss_privileges(handle);
ret = 0;
break;
case VIDIOC_QUERYBUF:
{
struct v4l2_buffer *buf = arg;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_query_buffer(&stream->queue, buf);
}
case VIDIOC_CREATE_BUFS:
{
struct v4l2_create_buffers *cb = arg;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
return uvc_create_buffers(&stream->queue, cb);
}
case VIDIOC_QBUF:
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_queue_buffer(&stream->queue, arg);
case VIDIOC_DQBUF:
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_dequeue_buffer(&stream->queue, arg,
file->f_flags & O_NONBLOCK);
case VIDIOC_STREAMON:
{
int *type = arg;
if (*type != stream->type)
return -EINVAL;
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
if (!uvc_has_privileges(handle))
return -EBUSY;
mutex_lock(&stream->mutex);
ret = uvc_video_enable(stream, 1);
mutex_unlock(&stream->mutex);
if (ret < 0)
return ret;
break;
}
case VIDIOC_STREAMOFF:
{
int *type = arg;
if (*type != stream->type)
return -EINVAL;
ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
if (ret < 0)
return ret;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_video_enable(stream, 0);
}
case VIDIOC_SUBSCRIBE_EVENT:
{
struct v4l2_event_subscription *sub = arg;
switch (sub->type) {
case V4L2_EVENT_CTRL:
return v4l2_event_subscribe(&handle->vfh, sub, 0,
&uvc_ctrl_sub_ev_ops);
default:
return -EINVAL;
}
}
case VIDIOC_UNSUBSCRIBE_EVENT:
return v4l2_event_unsubscribe(&handle->vfh, arg);
case VIDIOC_DQEVENT:
return v4l2_event_dequeue(&handle->vfh, arg,
file->f_flags & O_NONBLOCK);
/* Analog video standards make no sense for digital cameras. */
case VIDIOC_ENUMSTD:
case VIDIOC_QUERYSTD:
case VIDIOC_G_STD:
case VIDIOC_S_STD:
case VIDIOC_OVERLAY:
case VIDIOC_ENUMAUDIO:
case VIDIOC_ENUMAUDOUT:
case VIDIOC_ENUMOUTPUT:
uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
return -ENOTTY;
case UVCIOC_CTRL_MAP:
return uvc_ioctl_ctrl_map(chain, arg);
case UVCIOC_CTRL_QUERY:
return uvc_xu_ctrl_query(chain, arg);
default:
uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
return -ENOTTY;
}
return ret;
}
static long uvc_v4l2_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
if (uvc_trace_param & UVC_TRACE_IOCTL) {
uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
v4l_printk_ioctl(NULL, cmd);
printk(")\n");
}
return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
}
#ifdef CONFIG_COMPAT
struct uvc_xu_control_mapping32 {
__u32 id;
__u8 name[32];
__u8 entity[16];
__u8 selector;
__u8 size;
__u8 offset;
__u32 v4l2_type;
__u32 data_type;
compat_caddr_t menu_info;
__u32 menu_count;
__u32 reserved[4];
};
static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
const struct uvc_xu_control_mapping32 __user *up)
{
struct uvc_menu_info __user *umenus;
struct uvc_menu_info __user *kmenus;
compat_caddr_t p;
if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
__copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
__get_user(kp->menu_count, &up->menu_count))
return -EFAULT;
memset(kp->reserved, 0, sizeof(kp->reserved));
if (kp->menu_count == 0) {
kp->menu_info = NULL;
return 0;
}
if (__get_user(p, &up->menu_info))
return -EFAULT;
umenus = compat_ptr(p);
if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus)))
return -EFAULT;
kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus));
if (kmenus == NULL)
return -EFAULT;
kp->menu_info = kmenus;
if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus)))
return -EFAULT;
return 0;
}
static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
struct uvc_xu_control_mapping32 __user *up)
{
struct uvc_menu_info __user *umenus;
struct uvc_menu_info __user *kmenus = kp->menu_info;
compat_caddr_t p;
if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
__copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
__put_user(kp->menu_count, &up->menu_count))
return -EFAULT;
if (__clear_user(up->reserved, sizeof(up->reserved)))
return -EFAULT;
if (kp->menu_count == 0)
return 0;
if (get_user(p, &up->menu_info))
return -EFAULT;
umenus = compat_ptr(p);
if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus)))
return -EFAULT;
return 0;
}
struct uvc_xu_control_query32 {
__u8 unit;
__u8 selector;
__u8 query;
__u16 size;
compat_caddr_t data;
};
static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
const struct uvc_xu_control_query32 __user *up)
{
u8 __user *udata;
u8 __user *kdata;
compat_caddr_t p;
if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
__copy_from_user(kp, up, offsetof(typeof(*up), data)))
return -EFAULT;
if (kp->size == 0) {
kp->data = NULL;
return 0;
}
if (__get_user(p, &up->data))
return -EFAULT;
udata = compat_ptr(p);
if (!access_ok(VERIFY_READ, udata, kp->size))
return -EFAULT;
kdata = compat_alloc_user_space(kp->size);
if (kdata == NULL)
return -EFAULT;
kp->data = kdata;
if (copy_in_user(kdata, udata, kp->size))
return -EFAULT;
return 0;
}
static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
struct uvc_xu_control_query32 __user *up)
{
u8 __user *udata;
u8 __user *kdata = kp->data;
compat_caddr_t p;
if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
__copy_to_user(up, kp, offsetof(typeof(*up), data)))
return -EFAULT;
if (kp->size == 0)
return 0;
if (get_user(p, &up->data))
return -EFAULT;
udata = compat_ptr(p);
if (!access_ok(VERIFY_READ, udata, kp->size))
return -EFAULT;
if (copy_in_user(udata, kdata, kp->size))
return -EFAULT;
return 0;
}
#define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
#define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32)
static long uvc_v4l2_compat_ioctl32(struct file *file,
unsigned int cmd, unsigned long arg)
{
union {
struct uvc_xu_control_mapping xmap;
struct uvc_xu_control_query xqry;
} karg;
void __user *up = compat_ptr(arg);
mm_segment_t old_fs;
long ret;
switch (cmd) {
case UVCIOC_CTRL_MAP32:
cmd = UVCIOC_CTRL_MAP;
ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
break;
case UVCIOC_CTRL_QUERY32:
cmd = UVCIOC_CTRL_QUERY;
ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
break;
default:
return -ENOIOCTLCMD;
}
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg);
set_fs(old_fs);
if (ret < 0)
return ret;
switch (cmd) {
case UVCIOC_CTRL_MAP:
ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
break;
case UVCIOC_CTRL_QUERY:
ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
break;
}
return ret;
}
#endif
static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
size_t count, loff_t *ppos)
{
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
return -EINVAL;
}
static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
{
struct uvc_fh *handle = file->private_data;
struct uvc_streaming *stream = handle->stream;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
return uvc_queue_mmap(&stream->queue, vma);
}
static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
{
struct uvc_fh *handle = file->private_data;
struct uvc_streaming *stream = handle->stream;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
return uvc_queue_poll(&stream->queue, file, wait);
}
#ifndef CONFIG_MMU
static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len, unsigned long pgoff,
unsigned long flags)
{
struct uvc_fh *handle = file->private_data;
struct uvc_streaming *stream = handle->stream;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
}
#endif
const struct v4l2_file_operations uvc_fops = {
.owner = THIS_MODULE,
.open = uvc_v4l2_open,
.release = uvc_v4l2_release,
.unlocked_ioctl = uvc_v4l2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl32 = uvc_v4l2_compat_ioctl32,
#endif
.read = uvc_v4l2_read,
.mmap = uvc_v4l2_mmap,
.poll = uvc_v4l2_poll,
#ifndef CONFIG_MMU
.get_unmapped_area = uvc_v4l2_get_unmapped_area,
#endif
};