From 063a40d9111ce7558f2fdfa4f85acfc47eb27353 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 28 Aug 2006 13:20:13 +0200 Subject: [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 Signed-off-by: Jaroslav Kysela --- include/sound/tlv.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/sound') diff --git a/include/sound/tlv.h b/include/sound/tlv.h index b826e1df1da6..7905841643df 100644 --- a/include/sound/tlv.h +++ b/include/sound/tlv.h @@ -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 */ -- cgit v1.2.3-59-g8ed1b