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[media] uvcvideo: Add VIDIOC_[GS]_PRIORITY support

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Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2012-08-28 20:29:56 -03:00 committed by Mauro Carvalho Chehab
parent 69d11262a3
commit 0550513c7a
3 changed files with 49 additions and 0 deletions
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3
drivers/media/usb/uvc/uvc_driver.c
View File

@ -1562,6 +1562,7 @@ static int uvc_scan_device(struct uvc_device *dev)
INIT_LIST_HEAD(&chain->entities);
mutex_init(&chain->ctrl_mutex);
chain->dev = dev;
v4l2_prio_init(&chain->prio);
if (uvc_scan_chain(chain, term) < 0) {
kfree(chain);
@ -1722,6 +1723,8 @@ static int uvc_register_video(struct uvc_device *dev,
vdev->v4l2_dev = &dev->vdev;
vdev->fops = &uvc_fops;
vdev->release = uvc_release;
vdev->prio = &stream->chain->prio;
set_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags);
if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
vdev->vfl_dir = VFL_DIR_TX;
strlcpy(vdev->name, dev->name, sizeof vdev->name);

45
drivers/media/usb/uvc/uvc_v4l2.c
View File

@ -576,6 +576,19 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
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);
@ -606,6 +619,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
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;
@ -653,6 +670,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
}
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;
@ -747,6 +768,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
{
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;
@ -800,6 +825,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
}
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;
@ -902,6 +931,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
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;
@ -936,6 +969,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
/* 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;
@ -981,6 +1018,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *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;
@ -999,6 +1040,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *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;

1
drivers/media/usb/uvc/uvcvideo.h
View File

@ -372,6 +372,7 @@ struct uvc_video_chain {
struct mutex ctrl_mutex; /* Protects ctrl.info */
struct v4l2_prio_state prio; /* V4L2 priority state */
u32 caps; /* V4L2 chain-wide caps */
};