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Commit bbaccc04 authored by Trent Piepho's avatar Trent Piepho Committed by Mauro Carvalho Chehab
Browse files

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



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

Signed-off-by: default avatarTrent Piepho <xyzzy@speakeasy.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 54ac005a

drivers/media/video/cx88/cx88-alsa.c

+6 −0
Original line number Diff line number Diff line
@@ -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,