[PATCH RFC v2 02/16] media: Add a common embeed struct for all media graph objects

[Mauro Carvalho Chehab]

Due to the MC API proposed changes, we'll need to:
        - have an unique object ID for all graph objects;
        - be able to dynamically create/remove objects;
        - be able to group objects;
        - keep the object in memory until we stop use it.

Due to that, create a struct media_graph_obj and put there the
common elements that all media objects will have in common.

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

diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index 0c003d817493..051aa3f8bbfe 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -28,10 +28,50 @@
 #include <linux/list.h>
 #include <linux/media.h>
 
+/* Enums used internally at the media controller to represent graphs */
+
+/**
+ * enum media_graph_type - type of a graph element
+ *
+ * @MEDIA_GRAPH_ENTITY:                Identify a media entity
+ * @MEDIA_GRAPH_PAD:           Identify a media PAD
+ * @MEDIA_GRAPH_LINK:          Identify a media link
+ */
+enum media_graph_type {
+       MEDIA_GRAPH_ENTITY,
+       MEDIA_GRAPH_PAD,
+       MEDIA_GRAPH_LINK,
+};
+
+
+/* Structs to represent the objects that belong to a media graph */
+
+/**
+ * struct media_graph_obj - Define a graph object.
+ *
+ * @list:              List of media graph objects
+ * @obj_id:            Non-zero object ID identifier. The ID should be unique
+ *                     inside a media_device
+ * @type:              Type of the graph object
+ * @mdev:              Media device that contains the object
+ *                     object before stopping using it
+ *
+ * All elements on the media graph should have this struct embedded
+ */
+struct media_graph_obj {
+       struct list_head        list;
+       struct list_head        group;
+       u32                     obj_id;
+       enum media_graph_type   type;
+       struct media_device     *mdev;
+};
+
+
 struct media_pipeline {
 };
 
 struct media_link {
+       struct media_graph_obj                  graph_obj;
        struct media_pad *source;       /* Source pad */
        struct media_pad *sink;         /* Sink pad  */
        struct media_link *reverse;     /* Link in the reverse direction */
@@ -39,6 +79,7 @@ struct media_link {
 };
 
 struct media_pad {
+       struct media_graph_obj                  graph_obj;
        struct media_entity *entity;    /* Entity this pad belongs to */
        u16 index;                      /* Pad index in the entity pads array */
        unsigned long flags;            /* Pad flags (MEDIA_PAD_FL_*) */
@@ -61,6 +102,7 @@ struct media_entity_operations {
 };
 
 struct media_entity {
+       struct media_graph_obj                  graph_obj;
        struct list_head list;
        struct media_device *parent;    /* Media device this entity belongs to*/
        u32 id;                         /* Entity ID, unique in the parent media
-- 
2.4.3

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