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media: cec: add support for Absolute Volume Control

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Add support for this new CEC message. This was added in HDMI 2.1a.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Hans Verkuil
2022-08-30 12:37:24 +02:00
committed by Mauro Carvalho Chehab
parent 20694e96ca
commit 479747caa5
4 changed files with 19 additions and 0 deletions
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14
include/uapi/linux/cec-funcs.h
View File

@@ -1568,6 +1568,20 @@ static inline void cec_ops_request_short_audio_descriptor(const struct cec_msg *
}
}
static inline void cec_msg_set_audio_volume_level(struct cec_msg *msg,
__u8 audio_volume_level)
{
msg->len = 3;
msg->msg[1] = CEC_MSG_SET_AUDIO_VOLUME_LEVEL;
msg->msg[2] = audio_volume_level;
}
static inline void cec_ops_set_audio_volume_level(const struct cec_msg *msg,
__u8 *audio_volume_level)
{
*audio_volume_level = msg->msg[2];
}
/* Audio Rate Control Feature */
static inline void cec_msg_set_audio_rate(struct cec_msg *msg,

2
include/uapi/linux/cec.h
View File

@@ -768,6 +768,7 @@ struct cec_event {
#define CEC_OP_FEAT_DEV_HAS_SET_AUDIO_RATE 0x08
#define CEC_OP_FEAT_DEV_SINK_HAS_ARC_TX 0x04
#define CEC_OP_FEAT_DEV_SOURCE_HAS_ARC_RX 0x02
#define CEC_OP_FEAT_DEV_HAS_SET_AUDIO_VOLUME_LEVEL 0x01
#define CEC_MSG_GIVE_FEATURES 0xa5 /* HDMI 2.0 */
@@ -1059,6 +1060,7 @@ struct cec_event {
#define CEC_OP_AUD_FMT_ID_CEA861 0
#define CEC_OP_AUD_FMT_ID_CEA861_CXT 1
#define CEC_MSG_SET_AUDIO_VOLUME_LEVEL 0x73
/* Audio Rate Control Feature */
#define CEC_MSG_SET_AUDIO_RATE 0x9a