[alsa-devel] [RFC PATCH 07/11] [media] media: add entity types for ALSA

[Clemens Ladisch]

Add entity types for describing the topology of sound devices.

JACK entities represent connections to the outside world.  Properties of
the jack will be described by a TLV on the jack entity.

MIXER entities add their inputs together, while SELECTOR entities route
on of their inputs to the output.  PROCESSING entities represent volume/
mute controls or other effects processing units.  These entities may
have ALSA controls associated with them, which is indicated by those
controls having a TLV containing the entity ID and the control type.

SPLIT and MERGE entities are needed for HDA codecs, whose topology is
constructed of stereo channel pairs.

Signed-off-by: Clemens Ladisch <clemens at ladisch.de>
---
 include/linux/media.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/linux/media.h b/include/linux/media.h
index 0ef8833..9d2ad75 100644
--- a/include/linux/media.h
+++ b/include/linux/media.h
@@ -57,6 +57,15 @@ struct media_device_info {
 #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)

+#define MEDIA_ENT_T_JACK		(3 << MEDIA_ENT_TYPE_SHIFT)
+
+#define MEDIA_ENT_T_ALSA		(4 << MEDIA_ENT_TYPE_SHIFT)
+#define MEDIA_ENT_T_ALSA_MIXER		(MEDIA_ENT_T_ALSA + 1)
+#define MEDIA_ENT_T_ALSA_SELECTOR	(MEDIA_ENT_T_ALSA + 2)
+#define MEDIA_ENT_T_ALSA_PROCESSING	(MEDIA_ENT_T_ALSA + 3)
+#define MEDIA_ENT_T_ALSA_SPLIT		(MEDIA_ENT_T_ALSA + 4)
+#define MEDIA_ENT_T_ALSA_MERGE		(MEDIA_ENT_T_ALSA + 5)
+
 #define MEDIA_ENT_FL_DEFAULT		(1 << 0)

 struct media_entity_desc {