[media] v4l: Make v4l2_subdev inherit from media_entity
V4L2 subdevices are media entities. As such they need to inherit from
(include) the media_entity structure.
When registering/unregistering the subdevice, 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@iki.fi>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
index 0c67f5a..8557363 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -35,7 +35,10 @@
{
struct video_device *vdev = video_devdata(file);
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
- struct v4l2_fh *vfh;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ struct media_entity *entity;
+#endif
+ struct v4l2_fh *vfh = NULL;
int ret;
if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) {
@@ -58,11 +61,20 @@
v4l2_fh_add(vfh);
file->private_data = vfh;
}
-
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ if (sd->v4l2_dev->mdev) {
+ entity = media_entity_get(&sd->entity);
+ if (!entity) {
+ ret = -EBUSY;
+ goto err;
+ }
+ }
+#endif
return 0;
err:
if (vfh != NULL) {
+ v4l2_fh_del(vfh);
v4l2_fh_exit(vfh);
kfree(vfh);
}
@@ -72,8 +84,16 @@
static int subdev_close(struct file *file)
{
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+#endif
struct v4l2_fh *vfh = file->private_data;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ if (sd->v4l2_dev->mdev)
+ media_entity_put(&sd->entity);
+#endif
if (vfh != NULL) {
v4l2_fh_del(vfh);
v4l2_fh_exit(vfh);
@@ -172,5 +192,9 @@
sd->grp_id = 0;
sd->dev_priv = NULL;
sd->host_priv = NULL;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ sd->entity.name = sd->name;
+ sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
+#endif
}
EXPORT_SYMBOL(v4l2_subdev_init);