mirror of https://gitee.com/openkylin/linux.git
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>
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@ -39,6 +39,7 @@
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#include <sound/pcm_params.h>
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#include <sound/control.h>
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#include <sound/initval.h>
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#include <sound/tlv.h>
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#include "cx88.h"
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#include "cx88-reg.h"
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@ -605,12 +606,17 @@ static int snd_cx88_volume_put(struct snd_kcontrol *kcontrol,
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return changed;
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}
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static const DECLARE_TLV_DB_SCALE(snd_cx88_db_scale, -6300, 100, 0);
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static struct snd_kcontrol_new snd_cx88_volume = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
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.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
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SNDRV_CTL_ELEM_ACCESS_TLV_READ,
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.name = "Playback Volume",
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.info = snd_cx88_volume_info,
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.get = snd_cx88_volume_get,
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.put = snd_cx88_volume_put,
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.tlv.p = snd_cx88_db_scale,
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};
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static int snd_cx88_switch_get(struct snd_kcontrol *kcontrol,
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