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| author | Jaroslav Kysela <perex@suse.cz> | 2006-06-01 18:34:01 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-09-23 10:36:42 +0200 |
| commit | 42750b04c5baa7c5ffdf0a8be2b9b320efdf069f (patch) | |
| tree | 52aea8f1eeb44405b67bc5b381cce6bc20e2bff6 /include/sound/asound.h | |
| parent | 3eeab61aa3ddd3c0bedb7449ada1599de22fdb5a (diff) | |
| download | lwn-42750b04c5baa7c5ffdf0a8be2b9b320efdf069f.tar.gz lwn-42750b04c5baa7c5ffdf0a8be2b9b320efdf069f.zip | |
[ALSA] Control API - TLV implementation for additional information like dB scale
This patch implements a TLV mechanism to transfer an additional information
like dB scale to the user space. The types might be extended in future.
Acked-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'include/sound/asound.h')
| -rw-r--r-- | include/sound/asound.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/sound/asound.h b/include/sound/asound.h index 41885f48ad91..76a20406bd18 100644 --- a/include/sound/asound.h +++ b/include/sound/asound.h @@ -688,7 +688,7 @@ struct snd_timer_tread { * * ****************************************************************************/ -#define SNDRV_CTL_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 3) +#define SNDRV_CTL_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 4) struct snd_ctl_card_info { int card; /* card number */ @@ -818,6 +818,12 @@ struct snd_ctl_elem_value { unsigned char reserved[128-sizeof(struct timespec)]; }; +struct snd_ctl_tlv { + unsigned int numid; /* control element numeric identification */ + unsigned int length; /* in bytes aligned to 4 */ + unsigned int tlv[0]; /* first TLV */ +}; + enum { SNDRV_CTL_IOCTL_PVERSION = _IOR('U', 0x00, int), SNDRV_CTL_IOCTL_CARD_INFO = _IOR('U', 0x01, struct snd_ctl_card_info), @@ -831,6 +837,7 @@ enum { SNDRV_CTL_IOCTL_ELEM_ADD = _IOWR('U', 0x17, struct snd_ctl_elem_info), SNDRV_CTL_IOCTL_ELEM_REPLACE = _IOWR('U', 0x18, struct snd_ctl_elem_info), SNDRV_CTL_IOCTL_ELEM_REMOVE = _IOWR('U', 0x19, struct snd_ctl_elem_id), + SNDRV_CTL_IOCTL_TLV_READ = _IOWR('U', 0x1a, struct snd_ctl_tlv), SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE = _IOWR('U', 0x20, int), SNDRV_CTL_IOCTL_HWDEP_INFO = _IOR('U', 0x21, struct snd_hwdep_info), SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE = _IOR('U', 0x30, int), |