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[ALSA] Add the definition of linear volume TLV 

Added the definition of linear volume TLV type.
Some DSP chips and codecs (e.g. AK codec) use linear volume control.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2006-08-28 13:20:13 +02:00 committed by Jaroslav Kysela
parent 1f14d167f0
commit 063a40d911
1 changed files with 10 additions and 0 deletions
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10
include/sound/tlv.h
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@ -33,6 +33,7 @@
#define SNDRV_CTL_TLVT_CONTAINER 0 /* one level down - group of TLVs */
#define SNDRV_CTL_TLVT_DB_SCALE 1 /* dB scale */
#define SNDRV_CTL_TLVT_DB_LINEAR 2 /* linear volume */
#define DECLARE_TLV_DB_SCALE(name, min, step, mute) \
unsigned int name[] = { \
@ -40,4 +41,13 @@ unsigned int name[] = { \
(min), ((step) & 0xffff) | ((mute) ? 0x10000 : 0) \
}
/* linear volume between min_dB and max_dB (.01dB unit) */
#define DECLARE_TLV_DB_LINEAR(name, min_dB, max_dB) \
unsigned int name[] = { \
SNDRV_CTL_TLVT_DB_LINEAR, 2 * sizeof(unsigned int), \
(min_dB), (max_dB) \
}
#define TLV_DB_GAIN_MUTE -9999999
#endif /* __SOUND_TLV_H */