[media] uapi/media.h: Fix entity namespace

Now that interfaces got created, we need to fix the entity
namespace.

So, let's create a consistent new namespace and add backward
compatibility macros to keep the old namespace preserved.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-core/dvbdev.c

@@ -230,17 +230,17 @@ static void dvb_create_media_entity(struct dvb_device *dvbdev,
 
 	switch (type) {
 	case DVB_DEVICE_FRONTEND:
-		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_FE;
+		dvbdev->entity->type = MEDIA_ENT_T_DVB_DEMOD;
 		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 		break;
 	case DVB_DEVICE_DEMUX:
-		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DEMUX;
+		dvbdev->entity->type = MEDIA_ENT_T_DVB_DEMUX;
 		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 		break;
 	case DVB_DEVICE_CA:
-		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_CA;
+		dvbdev->entity->type = MEDIA_ENT_T_DVB_CA;
 		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 		break;
@@ -439,7 +439,7 @@ EXPORT_SYMBOL(dvb_unregister_device);
 void dvb_create_media_graph(struct dvb_adapter *adap)
 {
 	struct media_device *mdev = adap->mdev;
-	struct media_entity *entity, *tuner = NULL, *fe = NULL;
+	struct media_entity *entity, *tuner = NULL, *demod = NULL;
 	struct media_entity *demux = NULL, *dvr = NULL, *ca = NULL;
 	struct media_interface *intf;
 
@@ -451,26 +451,26 @@ void dvb_create_media_graph(struct dvb_adapter *adap)
 		case MEDIA_ENT_T_V4L2_SUBDEV_TUNER:
 			tuner = entity;
 			break;
-		case MEDIA_ENT_T_DEVNODE_DVB_FE:
-			fe = entity;
+		case MEDIA_ENT_T_DVB_DEMOD:
+			demod = entity;
 			break;
-		case MEDIA_ENT_T_DEVNODE_DVB_DEMUX:
+		case MEDIA_ENT_T_DVB_DEMUX:
 			demux = entity;
 			break;
-		case MEDIA_ENT_T_DEVNODE_DVB_DVR:
+		case MEDIA_ENT_T_DVB_TSOUT:
 			dvr = entity;
 			break;
-		case MEDIA_ENT_T_DEVNODE_DVB_CA:
+		case MEDIA_ENT_T_DVB_CA:
 			ca = entity;
 			break;
 		}
 	}
 
-	if (tuner && fe)
-		media_create_pad_link(tuner, 0, fe, 0, 0);
+	if (tuner && demod)
+		media_create_pad_link(tuner, 0, demod, 0, 0);
 
-	if (fe && demux)
-		media_create_pad_link(fe, 1, demux, 0, MEDIA_LNK_FL_ENABLED);
+	if (demod && demux)
+		media_create_pad_link(demod, 1, demux, 0, MEDIA_LNK_FL_ENABLED);
 
 	if (demux && dvr)
 		media_create_pad_link(demux, 1, dvr, 0, MEDIA_LNK_FL_ENABLED);

include/uapi/linux/media.h

@@ -42,31 +42,69 @@ struct media_device_info {
 
 #define MEDIA_ENT_ID_FLAG_NEXT		(1 << 31)
 
+/*
+ * Base numbers for entity types
+ *
+ * Please notice that the huge gap of 16 bits for each base is overkill!
+ * 8 bits is more than enough to avoid starving entity types for each
+ * subsystem.
+ *
+ * However, It is kept this way just to avoid binary breakages with the
+ * namespace provided on legacy versions of this header.
+ */
+#define MEDIA_ENT_T_DVB_BASE		0x00000000
+#define MEDIA_ENT_T_V4L2_BASE		0x00010000
+#define MEDIA_ENT_T_V4L2_SUBDEV_BASE	0x00020000
+
+/*
+ * V4L2 entities - Those are used for DMA (mmap/DMABUF) and
+ *	read()/write() data I/O associated with the V4L2 devnodes.
+ */
+#define MEDIA_ENT_T_V4L2_VIDEO		(MEDIA_ENT_T_V4L2_BASE + 1)
+	/*
+	 * Please notice that numbers between MEDIA_ENT_T_V4L2_BASE + 2 and
+	 * MEDIA_ENT_T_V4L2_BASE + 4 can't be used, as those values used
+	 * to be declared for FB, ALSA and DVB entities.
+	 * As those values were never actually used in practice, we're just
+	 * adding them as backward compatibility macros and keeping the
+	 * numberspace clean here. This way, we avoid breaking compilation,
+	 * in the case of having some userspace application using the old
+	 * symbols.
+	 */
+#define MEDIA_ENT_T_V4L2_VBI		(MEDIA_ENT_T_V4L2_BASE + 5)
+#define MEDIA_ENT_T_V4L2_SWRADIO	(MEDIA_ENT_T_V4L2_BASE + 6)
+
+/* V4L2 Sub-device entities */
+#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)
+	/* A converter of analogue video to its digital representation. */
+#define MEDIA_ENT_T_V4L2_SUBDEV_DECODER	(MEDIA_ENT_T_V4L2_SUBDEV_BASE + 4)
+	/* Tuner entity is actually both V4L2 and DVB subdev */
+#define MEDIA_ENT_T_V4L2_SUBDEV_TUNER	(MEDIA_ENT_T_V4L2_SUBDEV_BASE + 5)
+
+/* DVB entities */
+#define MEDIA_ENT_T_DVB_DEMOD		(MEDIA_ENT_T_DVB_BASE + 1)
+#define MEDIA_ENT_T_DVB_DEMUX		(MEDIA_ENT_T_DVB_BASE + 2)
+#define MEDIA_ENT_T_DVB_TSOUT		(MEDIA_ENT_T_DVB_BASE + 3)
+#define MEDIA_ENT_T_DVB_CA		(MEDIA_ENT_T_DVB_BASE + 4)
+#define MEDIA_ENT_T_DVB_NET_DECAP	(MEDIA_ENT_T_DVB_BASE + 5)
+
+/* Legacy symbols used to avoid userspace compilation breakages */
 #define MEDIA_ENT_TYPE_SHIFT		16
 #define MEDIA_ENT_TYPE_MASK		0x00ff0000
 #define MEDIA_ENT_SUBTYPE_MASK		0x0000ffff
 
-#define MEDIA_ENT_T_DEVNODE		(1 << MEDIA_ENT_TYPE_SHIFT)
-#define MEDIA_ENT_T_DEVNODE_V4L		(MEDIA_ENT_T_DEVNODE + 1)
+#define MEDIA_ENT_T_DEVNODE		MEDIA_ENT_T_V4L2_BASE
+#define MEDIA_ENT_T_V4L2_SUBDEV		MEDIA_ENT_T_V4L2_SUBDEV_BASE
+
+#define MEDIA_ENT_T_DEVNODE_V4L		MEDIA_ENT_T_V4L2_VIDEO
+
 #define MEDIA_ENT_T_DEVNODE_FB		(MEDIA_ENT_T_DEVNODE + 2)
 #define MEDIA_ENT_T_DEVNODE_ALSA	(MEDIA_ENT_T_DEVNODE + 3)
-#define MEDIA_ENT_T_DEVNODE_DVB_FE	(MEDIA_ENT_T_DEVNODE + 4)
-#define MEDIA_ENT_T_DEVNODE_DVB_DEMUX	(MEDIA_ENT_T_DEVNODE + 5)
-#define MEDIA_ENT_T_DEVNODE_DVB_DVR	(MEDIA_ENT_T_DEVNODE + 6)
-#define MEDIA_ENT_T_DEVNODE_DVB_CA	(MEDIA_ENT_T_DEVNODE + 7)
-#define MEDIA_ENT_T_DEVNODE_DVB_NET	(MEDIA_ENT_T_DEVNODE + 8)
-
-/* Legacy symbol. Use it to avoid userspace compilation breakages */
-#define MEDIA_ENT_T_DEVNODE_DVB		MEDIA_ENT_T_DEVNODE_DVB_FE
-
-#define MEDIA_ENT_T_V4L2_SUBDEV		(2 << MEDIA_ENT_TYPE_SHIFT)
-#define MEDIA_ENT_T_V4L2_SUBDEV_SENSOR	(MEDIA_ENT_T_V4L2_SUBDEV + 1)
-#define MEDIA_ENT_T_V4L2_SUBDEV_FLASH	(MEDIA_ENT_T_V4L2_SUBDEV + 2)
-#define MEDIA_ENT_T_V4L2_SUBDEV_LENS	(MEDIA_ENT_T_V4L2_SUBDEV + 3)
-/* A converter of analogue video to its digital representation. */
-#define MEDIA_ENT_T_V4L2_SUBDEV_DECODER	(MEDIA_ENT_T_V4L2_SUBDEV + 4)
-
-#define MEDIA_ENT_T_V4L2_SUBDEV_TUNER	(MEDIA_ENT_T_V4L2_SUBDEV + 5)
+#define MEDIA_ENT_T_DEVNODE_DVB		(MEDIA_ENT_T_DEVNODE + 4)
+
+/* Entity types */
 
 #define MEDIA_ENT_FL_DEFAULT		(1 << 0)