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>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/media/video/cx88/cx88-alsa.c b/drivers/media/video/cx88/cx88-alsa.c
index 6cf8609588a5..40ffd7a5579a 100644
--- a/drivers/media/video/cx88/cx88-alsa.c
+++ b/drivers/media/video/cx88/cx88-alsa.c
@@ -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,