[media] media: add support to link interfaces and entities
Now that we have a new graph object called "interfaces", we
need to be able to link them to the entities.
Add a linked list to the interfaces to allow them to be
linked to the entities.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index e22954d..55cafb0 100644
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -857,6 +857,7 @@
intf->type = type;
intf->flags = flags;
+ INIT_LIST_HEAD(&intf->links);
devnode->major = major;
devnode->minor = minor;
@@ -874,3 +875,40 @@
kfree(devnode);
}
EXPORT_SYMBOL_GPL(media_devnode_remove);
+
+struct media_link *media_create_intf_link(struct media_entity *entity,
+ struct media_interface *intf,
+ u32 flags)
+{
+ struct media_link *link;
+
+ link = media_add_link(&intf->links);
+ if (link == NULL)
+ return NULL;
+
+ link->intf = intf;
+ link->entity = entity;
+ link->flags = flags;
+
+ /* Initialize graph object embedded at the new link */
+ media_gobj_init(intf->graph_obj.mdev, MEDIA_GRAPH_LINK,
+ &link->graph_obj);
+
+ return link;
+}
+EXPORT_SYMBOL_GPL(media_create_intf_link);
+
+
+static void __media_remove_intf_link(struct media_link *link)
+{
+ media_gobj_remove(&link->graph_obj);
+ kfree(link);
+}
+
+void media_remove_intf_link(struct media_link *link)
+{
+ mutex_lock(&link->graph_obj.mdev->graph_mutex);
+ __media_remove_intf_link(link);
+ mutex_unlock(&link->graph_obj.mdev->graph_mutex);
+}
+EXPORT_SYMBOL_GPL(media_remove_intf_link);