ALSA: Add definitions for CEA-861 Audio InfoFrames

Along with the IEC-60958 channel status word, CEA-861 Audio InfoFrames
are used in HDMI and DisplayPort to describe the parameters of the audio
stream. Hence, drivers for such devices may use these definitions to, for
instance, fill a CEA-861 data structure and pass it to a display driver
to configure an IP.

Signed-off-by: Ricardo Neri <ricardo.neri@ti.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/sound/asound.h b/include/sound/asound.h
index a2e4ff5ba9e9..0876a1e76aef 100644
--- a/include/sound/asound.h
+++ b/include/sound/asound.h
@@ -70,6 +70,20 @@ struct snd_aes_iec958 {
 
 /****************************************************************************
  *                                                                          *
+ *        CEA-861 Audio InfoFrame. Used in HDMI and DisplayPort             *
+ *                                                                          *
+ ****************************************************************************/
+
+struct snd_cea_861_aud_if {
+        unsigned char db1_ct_cc; /* coding type and channel count */
+        unsigned char db2_sf_ss; /* sample frequency and size */
+        unsigned char db3; /* not used, all zeros */
+        unsigned char db4_ca; /* channel allocation code */
+        unsigned char db5_dminh_lsv; /* downmix inhibit & level-shit values */
+};
+
+/****************************************************************************
+ *                                                                          *
  *      Section for driver hardware dependent interface - /dev/snd/hw?      *
  *                                                                          *
  ****************************************************************************/