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SubjectRe: [RFC/PATCH v6 11/12] v4l: Make video_device inherit from media_entity
Date
On Thursday, November 25, 2010 03:28:18 Laurent Pinchart wrote:
> V4L2 devices are media entities. As such they need to inherit from
> (include) the media_entity structure.
>
> When registering/unregistering the device, the media entity is
> automatically registered/unregistered. The entity is acquired on device
> open and released on device close.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
> ---
> Documentation/video4linux/v4l2-framework.txt | 38 +++++++++++++++++++--
> drivers/media/video/v4l2-dev.c | 47 +++++++++++++++++++++++---
> include/media/v4l2-dev.h | 7 ++++
> 3 files changed, 84 insertions(+), 8 deletions(-)
>

<snip>

> diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
> index 035db52..511e1ee 100644
> --- a/drivers/media/video/v4l2-dev.c
> +++ b/drivers/media/video/v4l2-dev.c
> @@ -278,6 +278,9 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
> static int v4l2_open(struct inode *inode, struct file *filp)
> {
> struct video_device *vdev;
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> + struct media_entity *entity = NULL;
> +#endif
> int ret = 0;
>
> /* Check if the video device is available */
> @@ -291,6 +294,16 @@ static int v4l2_open(struct inode *inode, struct file *filp)
> /* and increase the device refcount */
> video_get(vdev);
> mutex_unlock(&videodev_lock);
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> + if (vdev->v4l2_dev && vdev->v4l2_dev->mdev) {
> + entity = media_entity_get(&vdev->entity);
> + if (!entity) {
> + ret = -EBUSY;
> + video_put(vdev);
> + return ret;
> + }
> + }
> +#endif
> if (vdev->fops->open) {
> if (vdev->lock)
> mutex_lock(vdev->lock);
> @@ -303,8 +316,13 @@ static int v4l2_open(struct inode *inode, struct file *filp)
> }
>
> /* decrease the refcount in case of an error */
> - if (ret)
> + if (ret) {
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> + if (vdev->v4l2_dev && vdev->v4l2_dev->mdev)
> + media_entity_put(entity);
> +#endif
> video_put(vdev);
> + }
> return ret;
> }
>
> @@ -321,7 +339,10 @@ static int v4l2_release(struct inode *inode, struct file *filp)
> if (vdev->lock)
> mutex_unlock(vdev->lock);
> }
> -
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> + if (vdev->v4l2_dev && vdev->v4l2_dev->mdev)
> + media_entity_put(&vdev->entity);
> +#endif
> /* decrease the refcount unconditionally since the release()
> return value is ignored. */
> video_put(vdev);
> @@ -558,12 +579,25 @@ int __video_register_device(struct video_device *vdev, int type, int nr,
> if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
> printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__,
> name_base, nr, video_device_node_name(vdev));
> -
> - /* Part 5: Activate this minor. The char device can now be used. */
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> + /* Part 5: Register the entity. */
> + if (vdev->v4l2_dev && vdev->v4l2_dev->mdev) {
> + vdev->entity.type = MEDIA_ENTITY_TYPE_NODE_V4L;
> + vdev->entity.name = vdev->name;
> + vdev->entity.v4l.major = VIDEO_MAJOR;
> + vdev->entity.v4l.minor = vdev->minor;
> + ret = media_device_register_entity(vdev->v4l2_dev->mdev,
> + &vdev->entity);
> + if (ret < 0)
> + printk(KERN_ERR "error\n"); /* TODO */

Was this forgotten, or will this be fixed in the next version? It looks
out-of-place...

> + }
> +#endif

Regards,

Hans

--
Hans Verkuil - video4linux developer - sponsored by Cisco


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