Code:
/*
* uvc_v4l2.c -- USB Video Class driver - V4L2 API
*
* Copyright (C) 2005-2008
* Laurent Pinchart (laurent.pinchart@skynet.be)
*
* 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/kernel.h>
#include <linux/version.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/wait.h>
#include <asm/atomic.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include "uvcvideo.h"
/* ------------------------------------------------------------------------
* V4L2 interface
*/
/*
* Mapping V4L2 controls to UVC controls can be straighforward if done well.
* Most of the UVC controls exist in V4L2, and can be mapped directly. Some
* must be grouped (for instance the Red Balance, Blue Balance and Do White
* Balance V4L2 controls use the White Balance Component UVC control) or
* otherwise translated. The approach we take here is to use a translation
* table for the controls which can be mapped directly, and handle the others
* manually.
*/
static int uvc_v4l2_query_menu(struct uvc_video_device *video,
struct v4l2_querymenu *query_menu)
{
struct uvc_menu_info *menu_info;
struct uvc_control_mapping *mapping;
struct uvc_control *ctrl;
ctrl = uvc_find_control(video, query_menu->id, &mapping);
if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
return -EINVAL;
if (query_menu->index >= mapping->menu_count)
return -EINVAL;
menu_info = &mapping->menu_info[query_menu->index];
strncpy(query_menu->name, menu_info->name, 32);
return 0;
}
/*
* 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_video_device *video,
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 != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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. */
for (i = 0; i < video->streaming->nformats; ++i) {
format = &video->streaming->format[i];
if (format->fcc == fmt->fmt.pix.pixelformat)
break;
}
if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
fmt->fmt.pix.pixelformat);
return -EINVAL;
}
/* 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).
*/
if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
probe->dwMaxVideoFrameSize =
video->streaming->ctrl.dwMaxVideoFrameSize;
/* Probe the device */
if ((ret = uvc_probe_video(video, probe)) < 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_video_device *video,
struct v4l2_format *fmt)
{
struct uvc_format *format = video->streaming->cur_format;
struct uvc_frame *frame = video->streaming->cur_frame;
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (format == NULL || frame == NULL)
return -EINVAL;
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 = video->streaming->ctrl.dwMaxVideoFrameSize;
fmt->fmt.pix.colorspace = format->colorspace;
fmt->fmt.pix.priv = 0;
return 0;
}
static int uvc_v4l2_set_format(struct uvc_video_device *video,
struct v4l2_format *fmt)
{
struct uvc_streaming_control probe;
struct uvc_format *format;
struct uvc_frame *frame;
int ret;
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (uvc_queue_streaming(&video->queue))
return -EBUSY;
ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
if (ret < 0)
return ret;
memcpy(&video->streaming->ctrl, &probe, sizeof probe);
video->streaming->cur_format = format;
video->streaming->cur_frame = frame;
return 0;
}
static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
struct v4l2_streamparm *parm)
{
uint32_t numerator, denominator;
if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
numerator = video->streaming->ctrl.dwFrameInterval;
denominator = 10000000;
uvc_simplify_fraction(&numerator, &denominator, 8, 333);
memset(parm, 0, sizeof *parm);
parm->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;
return 0;
}
static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
struct v4l2_streamparm *parm)
{
struct uvc_frame *frame = video->streaming->cur_frame;
struct uvc_streaming_control probe;
uint32_t interval;
int ret;
if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (uvc_queue_streaming(&video->queue))
return -EBUSY;
memcpy(&probe, &video->streaming->ctrl, sizeof probe);
interval = uvc_fraction_to_interval(
parm->parm.capture.timeperframe.numerator,
parm->parm.capture.timeperframe.denominator);
uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
parm->parm.capture.timeperframe.numerator,
parm->parm.capture.timeperframe.denominator,
interval);
probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
/* Probe the device with the new settings. */
if ((ret = uvc_probe_video(video, &probe)) < 0)
return ret;
memcpy(&video->streaming->ctrl, &probe, sizeof probe);
/* Return the actual frame period. */
parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval;
parm->parm.capture.timeperframe.denominator = 10000000;
uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator,
&parm->parm.capture.timeperframe.denominator,
8, 333);
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 which requires privileges will
* automatically acquire the required privileges if possible, or return -EBUSY
* otherwise. Privileges are dismissed when closing the instance.
*
* Operations which require privileges are:
*
* - VIDIOC_S_INPUT
* - VIDIOC_S_PARM
* - VIDIOC_S_FMT
* - VIDIOC_TRY_FMT
* - VIDIOC_REQBUFS
*/
static int uvc_acquire_privileges(struct uvc_fh *handle)
{
int ret = 0;
/* 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. */
mutex_lock(&uvc_driver.open_mutex);
if (atomic_inc_return(&handle->device->active) != 1) {
atomic_dec(&handle->device->active);
ret = -EBUSY;
goto done;
}
handle->state = UVC_HANDLE_ACTIVE;
done:
mutex_unlock(&uvc_driver.open_mutex);
return ret;
}
static void uvc_dismiss_privileges(struct uvc_fh *handle)
{
if (handle->state == UVC_HANDLE_ACTIVE)
atomic_dec(&handle->device->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 inode *inode, struct file *file)
{
struct uvc_video_device *video;
struct uvc_fh *handle;
int ret = 0;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
mutex_lock(&uvc_driver.open_mutex);
video = video_drvdata(file);
if (video->dev->state & UVC_DEV_DISCONNECTED) {
ret = -ENODEV;
goto done;
}
ret = usb_autopm_get_interface(video->dev->intf);
if (ret < 0)
goto done;
/* Create the device handle. */
handle = kzalloc(sizeof *handle, GFP_KERNEL);
if (handle == NULL) {
usb_autopm_put_interface(video->dev->intf);
ret = -ENOMEM;
goto done;
}
handle->device = video;
handle->state = UVC_HANDLE_PASSIVE;
file->private_data = handle;
kref_get(&video->dev->kref);
done:
mutex_unlock(&uvc_driver.open_mutex);
return ret;
}
static int uvc_v4l2_release(struct inode *inode, struct file *file)
{
struct uvc_video_device *video = video_drvdata(file);
struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
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(video, 0);
mutex_lock(&video->queue.mutex);
if (uvc_free_buffers(&video->queue) < 0)
uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
"free buffers.\n");
mutex_unlock(&video->queue.mutex);
}
/* Release the file handle. */
uvc_dismiss_privileges(handle);
kfree(handle);
file->private_data = NULL;
usb_autopm_put_interface(video->dev->intf);
kref_put(&video->dev->kref, uvc_delete);
return 0;
}
static int __uvc_v4l2_do_ioctl(struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *vdev = video_devdata(file);
struct uvc_video_device *video = video_get_drvdata(vdev);
struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
int ret = 0;
if (uvc_trace_param & UVC_TRACE_IOCTL)
v4l_printk_ioctl(cmd);
switch (cmd) {
/* Query capabilities */
case VIDIOC_QUERYCAP:
{
struct v4l2_capability *cap = arg;
memset(cap, 0, sizeof *cap);
strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
strncpy(cap->card, vdev->name, 32);
strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
sizeof cap->bus_info);
cap->version = DRIVER_VERSION_NUMBER;
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
| V4L2_CAP_STREAMING;
break;
}
/* Get, Set & Query control */
case VIDIOC_QUERYCTRL:
return uvc_query_v4l2_ctrl(video, arg);
case VIDIOC_G_CTRL:
{
struct v4l2_control *ctrl = arg;
struct v4l2_ext_control xctrl;
memset(&xctrl, 0, sizeof xctrl);
xctrl.id = ctrl->id;
uvc_ctrl_begin(video);
ret = uvc_ctrl_get(video, &xctrl);
uvc_ctrl_rollback(video);
if (ret >= 0)
ctrl->value = xctrl.value;
break;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *ctrl = arg;
struct v4l2_ext_control xctrl;
memset(&xctrl, 0, sizeof xctrl);
xctrl.id = ctrl->id;
xctrl.value = ctrl->value;
uvc_ctrl_begin(video);
ret = uvc_ctrl_set(video, &xctrl);
if (ret < 0) {
uvc_ctrl_rollback(video);
return ret;
}
ret = uvc_ctrl_commit(video);
break;
}
case VIDIOC_QUERYMENU:
return uvc_v4l2_query_menu(video, arg);
case VIDIOC_G_EXT_CTRLS:
{
struct v4l2_ext_controls *ctrls = arg;
struct v4l2_ext_control *ctrl = ctrls->controls;
unsigned int i;
uvc_ctrl_begin(video);
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
ret = uvc_ctrl_get(video, ctrl);
if (ret < 0) {
uvc_ctrl_rollback(video);
ctrls->error_idx = i;
return ret;
}
}
ctrls->error_idx = 0;
ret = uvc_ctrl_rollback(video);
break;
}
case VIDIOC_S_EXT_CTRLS:
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(video);
if (ret < 0)
return ret;
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
ret = uvc_ctrl_set(video, ctrl);
if (ret < 0) {
uvc_ctrl_rollback(video);
ctrls->error_idx = i;
return ret;
}
}
ctrls->error_idx = 0;
if (cmd == VIDIOC_S_EXT_CTRLS)
ret = uvc_ctrl_commit(video);
else
ret = uvc_ctrl_rollback(video);
break;
}
/* Get, Set & Enum input */
case VIDIOC_ENUMINPUT:
{
const struct uvc_entity *selector = video->selector;
struct v4l2_input *input = arg;
struct uvc_entity *iterm = NULL;
u32 index = input->index;
int pin = 0;
if (selector == NULL ||
(video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
if (index != 0)
return -EINVAL;
iterm = list_first_entry(&video->iterms,
struct uvc_entity, chain);
pin = iterm->id;
} else if (pin < selector->selector.bNrInPins) {
pin = selector->selector.baSourceID[index];
list_for_each_entry(iterm, video->iterms.next, chain) {
if (iterm->id == pin)
break;
}
}
if (iterm == NULL || iterm->id != pin)
return -EINVAL;
memset(input, 0, sizeof *input);
input->index = index;
strncpy(input->name, iterm->name, sizeof input->name);
if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
input->type = V4L2_INPUT_TYPE_CAMERA;
break;
}
case VIDIOC_G_INPUT:
{
u8 input;
if (video->selector == NULL ||
(video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
*(int *)arg = 0;
break;
}
ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
&input, 1);
if (ret < 0)
return ret;
*(int *)arg = input - 1;
break;
}
case VIDIOC_S_INPUT:
{
u8 input = *(u32 *)arg + 1;
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
if (video->selector == NULL ||
(video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
if (input != 1)
return -EINVAL;
break;
}
if (input > video->selector->selector.bNrInPins)
return -EINVAL;
return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
&input, 1);
}
/* Try, Get, Set & Enum format */
case VIDIOC_ENUM_FMT:
{
struct v4l2_fmtdesc *fmt = arg;
struct uvc_format *format;
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
fmt->index >= video->streaming->nformats)
return -EINVAL;
format = &video->streaming->format[fmt->index];
fmt->flags = 0;
if (format->flags & UVC_FMT_FLAG_COMPRESSED)
fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
strncpy(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;
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
}
case VIDIOC_S_FMT:
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
return uvc_v4l2_set_format(video, arg);
case VIDIOC_G_FMT:
return uvc_v4l2_get_format(video, 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 < video->streaming->nformats; i++) {
if (video->streaming->format[i].fcc ==
fsize->pixel_format) {
format = &video->streaming->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 < video->streaming->nformats; i++) {
if (video->streaming->format[i].fcc ==
fival->pixel_format) {
format = &video->streaming->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(video, arg);
case VIDIOC_S_PARM:
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
return uvc_v4l2_set_streamparm(video, arg);
/* Cropping and scaling */
case VIDIOC_CROPCAP:
{
struct v4l2_cropcap *ccap = arg;
struct uvc_frame *frame = video->streaming->cur_frame;
if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
ccap->bounds.left = 0;
ccap->bounds.top = 0;
ccap->bounds.width = frame->wWidth;
ccap->bounds.height = frame->wHeight;
ccap->defrect = ccap->bounds;
ccap->pixelaspect.numerator = 1;
ccap->pixelaspect.denominator = 1;
break;
}
case VIDIOC_G_CROP:
case VIDIOC_S_CROP:
return -EINVAL;
/* Buffers & streaming */
case VIDIOC_REQBUFS:
{
struct v4l2_requestbuffers *rb = arg;
unsigned int bufsize =
video->streaming->ctrl.dwMaxVideoFrameSize;
if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
rb->memory != V4L2_MEMORY_MMAP)
return -EINVAL;
if ((ret = uvc_acquire_privileges(handle)) < 0)
return ret;
ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
if (ret < 0)
return ret;
rb->count = ret;
ret = 0;
break;
}
case VIDIOC_QUERYBUF:
{
struct v4l2_buffer *buf = arg;
if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_query_buffer(&video->queue, buf);
}
case VIDIOC_QBUF:
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_queue_buffer(&video->queue, arg);
case VIDIOC_DQBUF:
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_dequeue_buffer(&video->queue, arg,
file->f_flags & O_NONBLOCK);
case VIDIOC_STREAMON:
{
int *type = arg;
if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (!uvc_has_privileges(handle))
return -EBUSY;
if ((ret = uvc_video_enable(video, 1)) < 0)
return ret;
break;
}
case VIDIOC_STREAMOFF:
{
int *type = arg;
if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_video_enable(video, 0);
}
/* 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 -EINVAL;
/* Dynamic controls. */
case UVCIOC_CTRL_ADD:
{
struct uvc_xu_control_info *xinfo = arg;
struct uvc_control_info *info;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
info = kmalloc(sizeof *info, GFP_KERNEL);
if (info == NULL)
return -ENOMEM;
memcpy(info->entity, xinfo->entity, sizeof info->entity);
info->index = xinfo->index;
info->selector = xinfo->selector;
info->size = xinfo->size;
info->flags = xinfo->flags;
info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
ret = uvc_ctrl_add_info(info);
if (ret < 0)
kfree(info);
break;
}
case UVCIOC_CTRL_MAP:
{
struct uvc_xu_control_mapping *xmap = arg;
struct uvc_control_mapping *map;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
map = kmalloc(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;
ret = uvc_ctrl_add_mapping(map);
if (ret < 0)
kfree(map);
break;
}
case UVCIOC_CTRL_GET:
return uvc_xu_ctrl_query(video, arg, 0);
case UVCIOC_CTRL_SET:
return uvc_xu_ctrl_query(video, arg, 1);
default:
if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
__uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
cmd);
return ret;
}
return ret;
}
static int uvc_v4l2_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
return __uvc_v4l2_do_ioctl(file, cmd, arg);
}
static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n");
return video_usercopy(inode, file, cmd, arg, uvc_v4l2_do_ioctl);
}
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 -ENODEV;
}
/*
* VMA operations.
*/
static void uvc_vm_open(struct vm_area_struct *vma)
{
struct uvc_buffer *buffer = vma->vm_private_data;
buffer->vma_use_count++;
}
static void uvc_vm_close(struct vm_area_struct *vma)
{
struct uvc_buffer *buffer = vma->vm_private_data;
buffer->vma_use_count--;
}
static struct vm_operations_struct uvc_vm_ops = {
.open = uvc_vm_open,
.close = uvc_vm_close,
};
static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
{
struct uvc_video_device *video = video_drvdata(file);
struct uvc_buffer *uninitialized_var(buffer);
struct page *page;
unsigned long addr, start, size;
unsigned int i;
int ret = 0;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
start = vma->vm_start;
size = vma->vm_end - vma->vm_start;
mutex_lock(&video->queue.mutex);
for (i = 0; i < video->queue.count; ++i) {
buffer = &video->queue.buffer[i];
if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
break;
}
if (i == video->queue.count || size != video->queue.buf_size) {
ret = -EINVAL;
goto done;
}
/*
* VM_IO marks the area as being an mmaped region for I/O to a
* device. It also prevents the region from being core dumped.
*/
vma->vm_flags |= VM_IO;
addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
while (size > 0) {
page = vmalloc_to_page((void *)addr);
if ((ret = vm_insert_page(vma, start, page)) < 0)
goto done;
start += PAGE_SIZE;
addr += PAGE_SIZE;
size -= PAGE_SIZE;
}
vma->vm_ops = &uvc_vm_ops;
vma->vm_private_data = buffer;
uvc_vm_open(vma);
done:
mutex_unlock(&video->queue.mutex);
return ret;
}
static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
{
struct uvc_video_device *video = video_drvdata(file);
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
return uvc_queue_poll(&video->queue, file, wait);
}
struct file_operations uvc_fops = {
.owner = THIS_MODULE,
.open = uvc_v4l2_open,
.release = uvc_v4l2_release,
.ioctl = uvc_v4l2_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
.read = uvc_v4l2_read,
.mmap = uvc_v4l2_mmap,
.poll = uvc_v4l2_poll,
};
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Originally Posted by mertyamak
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