[media] media: Fix DVB devnode representation at media controller

The previous provision for DVB media controller support were to
define an ID (likely meaning the adapter number) for the DVB
devnodes.

This is just plain wrong. Just like V4L, DVB devices (and any other
device node)) are uniquely identified via a (major, minor) tuple.

This is enough to uniquely identify a devnode, no matter what
API it implements.

So, before we go too far, let's mark the old v4l, fb, dvb and alsa
"devnode" info as deprecated, and just call it as "dev".

We can latter add fields specific to each API if needed.

As we don't want to break compilation on already existing apps,
let's just keep the old definitions as-is, adding a note that
those are deprecated at media-entity.h.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

4 files changed, 20 insertions, 15 deletions

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index 86bb93f..d89d5cb 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -943,8 +943,8 @@ int __video_register_device(struct video_device *vdev, int type, int nr,
 	    vdev->vfl_type != VFL_TYPE_SUBDEV) {
 		vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L;
 		vdev->entity.name = vdev->name;
-		vdev->entity.info.v4l.major = VIDEO_MAJOR;
-		vdev->entity.info.v4l.minor = vdev->minor;
+		vdev->entity.info.dev.major = VIDEO_MAJOR;
+		vdev->entity.info.dev.minor = vdev->minor;
 		ret = media_device_register_entity(vdev->v4l2_dev->mdev,
 			&vdev->entity);
 		if (ret < 0)
diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c
index 015f92a..204cc67 100644
--- a/drivers/media/v4l2-core/v4l2-device.c
+++ b/drivers/media/v4l2-core/v4l2-device.c
@@ -248,8 +248,8 @@ int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
 			goto clean_up;
 		}
 #if defined(CONFIG_MEDIA_CONTROLLER)
-		sd->entity.info.v4l.major = VIDEO_MAJOR;
-		sd->entity.info.v4l.minor = vdev->minor;
+		sd->entity.info.dev.major = VIDEO_MAJOR;
+		sd->entity.info.dev.minor = vdev->minor;
 #endif
 		sd->devnode = vdev;
 	}
diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index e004591..d6d74bc 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -87,17 +87,7 @@ struct media_entity {
 		struct {
 			u32 major;
 			u32 minor;
-		} v4l;
-		struct {
-			u32 major;
-			u32 minor;
-		} fb;
-		struct {
-			u32 card;
-			u32 device;
-			u32 subdevice;
-		} alsa;
-		int dvb;
+		} dev;
 
 		/* Sub-device specifications */
 		/* Nothing needed yet */
diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
index d847c76..418f4fe 100644
--- a/include/uapi/linux/media.h
+++ b/include/uapi/linux/media.h
@@ -78,6 +78,20 @@ struct media_entity_desc {
 		struct {
 			__u32 major;
 			__u32 minor;
+		} dev;
+
+#if 1
+		/*
+		 * DEPRECATED: previous node specifications. Kept just to
+		 * avoid breaking compilation, but media_entity_desc.dev
+		 * should be used instead. In particular, alsa and dvb
+		 * fields below are wrong: for all devnodes, there should
+		 * be just major/minor inside the struct, as this is enough
+		 * to represent any devnode, no matter what type.
+		 */
+		struct {
+			__u32 major;
+			__u32 minor;
 		} v4l;
 		struct {
 			__u32 major;
@@ -89,6 +103,7 @@ struct media_entity_desc {
 			__u32 subdevice;
 		} alsa;
 		int dvb;
+#endif
 
 		/* Sub-device specifications */
 		/* Nothing needed yet */