[media] media: add macros to check if subdev or V4L2 DMA

As we'll be removing entity subtypes from the Kernel, we need
to provide a way for drivers and core to check if a given
entity is represented by a V4L2 subdev or if it is an V4L2
I/O entity (typically with DMA).

Drivers that create entities that don't belong to any defined subdev
category should use MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN.

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

include/media/media-entity.h

@@ -220,6 +220,40 @@ static inline u32 media_gobj_gen_id(enum media_gobj_type type, u32 local_id)
 	return id;
 }
 
+static inline bool is_media_entity_v4l2_io(struct media_entity *entity)
+{
+	if (!entity)
+		return false;
+
+	switch (entity->type) {
+	case MEDIA_ENT_T_V4L2_VIDEO:
+	case MEDIA_ENT_T_V4L2_VBI:
+	case MEDIA_ENT_T_V4L2_SWRADIO:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static inline bool is_media_entity_v4l2_subdev(struct media_entity *entity)
+{
+	if (!entity)
+		return false;
+
+	switch (entity->type) {
+	case MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN:
+	case MEDIA_ENT_T_V4L2_SUBDEV_SENSOR:
+	case MEDIA_ENT_T_V4L2_SUBDEV_FLASH:
+	case MEDIA_ENT_T_V4L2_SUBDEV_LENS:
+	case MEDIA_ENT_T_V4L2_SUBDEV_DECODER:
+	case MEDIA_ENT_T_V4L2_SUBDEV_TUNER:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
 #define MEDIA_ENTITY_ENUM_MAX_DEPTH	16
 #define MEDIA_ENTITY_ENUM_MAX_ID	64
 

include/uapi/linux/media.h

@@ -75,6 +75,9 @@ struct media_device_info {
 #define MEDIA_ENT_T_V4L2_SWRADIO	(MEDIA_ENT_T_V4L2_BASE + 6)
 
 /* V4L2 Sub-device entities */
+
+#define MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN	MEDIA_ENT_T_V4L2_SUBDEV_BASE
+
 #define MEDIA_ENT_T_V4L2_SUBDEV_SENSOR	(MEDIA_ENT_T_V4L2_SUBDEV_BASE + 1)
 #define MEDIA_ENT_T_V4L2_SUBDEV_FLASH	(MEDIA_ENT_T_V4L2_SUBDEV_BASE + 2)
 #define MEDIA_ENT_T_V4L2_SUBDEV_LENS	(MEDIA_ENT_T_V4L2_SUBDEV_BASE + 3)