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V4L/DVB (6187): cx88-alsa: Add TLV support 

Lets mixer apps display a dB range for the volume control.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Trent Piepho 2007-09-06 23:02:25 -03:00 committed by Mauro Carvalho Chehab
parent 54ac005adc
commit bbaccc0445
1 changed files with 6 additions and 0 deletions
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6
drivers/media/video/cx88/cx88-alsa.c
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@ -39,6 +39,7 @@
#include <sound/pcm_params.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include "cx88.h"
#include "cx88-reg.h"
@ -605,12 +606,17 @@ static int snd_cx88_volume_put(struct snd_kcontrol *kcontrol,
return changed;
}
static const DECLARE_TLV_DB_SCALE(snd_cx88_db_scale, -6300, 100, 0);
static struct snd_kcontrol_new snd_cx88_volume = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
SNDRV_CTL_ELEM_ACCESS_TLV_READ,
.name = "Playback Volume",
.info = snd_cx88_volume_info,
.get = snd_cx88_volume_get,
.put = snd_cx88_volume_put,
.tlv.p = snd_cx88_db_scale,
};
static int snd_cx88_switch_get(struct snd_kcontrol *kcontrol,