[media] media-device: export the entity function via new ioctl

Now that entities have a main function, expose it via
MEDIA_IOC_G_TOPOLOGY ioctl.

Please notice that some entities may have secundary functions.
Such use case will be addressed later, when we add support for the
Media Controller properties.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

2 files changed, 3 insertions, 1 deletions

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 4f8388423edc..83525ac29328 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -263,6 +263,7 @@ static long __media_device_get_topology(struct media_device *mdev,
                 /* Copy fields to userspace struct if not error */
                 memset(&uentity, 0, sizeof(uentity));
                 uentity.id = entity->graph_obj.id;
+                uentity.function = entity->function;
                 strncpy(uentity.name, entity->name,
                         sizeof(uentity.name));
 
diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
index f9520225a211..290dd5585dc8 100644
--- a/include/uapi/linux/media.h
+++ b/include/uapi/linux/media.h
@@ -276,7 +276,8 @@ struct media_links_enum {
 struct media_v2_entity {
         __u32 id;
         char name[64];          /* FIXME: move to a property? (RFC says so) */
-        __u16 reserved[14];
+        __u32 function;         /* Main function of the entity */
+        __u16 reserved[12];
 };
 
 /* Should match the specific fields at media_intf_devnode */