[media] v4l: Make video_device inherit from media_entity

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@iki.fi>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 4fe6831b1851..51b2c515f687 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -16,6 +16,8 @@
 #include <linux/mutex.h>
 #include <linux/videodev2.h>
 
+#include <media/media-entity.h>
+
 #define VIDEO_MAJOR     81
 
 #define VFL_TYPE_GRABBER        0
@@ -55,6 +57,9 @@ struct v4l2_file_operations {
 
 struct video_device
 {
+#if defined(CONFIG_MEDIA_CONTROLLER)
+        struct media_entity entity;
+#endif
         /* device ops */
         const struct v4l2_file_operations *fops;
 
@@ -100,6 +105,8 @@ struct video_device
         struct mutex *lock;
 };
 
+#define media_entity_to_video_device(entity) \
+        container_of(entity, struct video_device, entity)
 /* dev to video-device */
 #define to_video_device(cd) container_of(cd, struct video_device, dev)