ASoC: wm9712: Add TLV information for microphone input

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm9712.c

@@ -20,6 +20,7 @@
 #include <sound/ac97_codec.h>
 #include <sound/initval.h>
 #include <sound/soc.h>
+#include <sound/tlv.h>
 #include "wm9712.h"
 
 static unsigned int ac97_read(struct snd_soc_codec *codec,
@@ -69,6 +70,9 @@ static const char *wm9712_rec_sel[] = {"Mic", "NC", "NC", "Speaker Mixer",
 static const char *wm9712_ng_type[] = {"Constant Gain", "Mute"};
 static const char *wm9712_diff_sel[] = {"Mic", "Line"};
 
+static const DECLARE_TLV_DB_SCALE(main_tlv, -3450, 150, 0);
+static const DECLARE_TLV_DB_SCALE(boost_tlv, 0, 2000, 0);
+
 static const struct soc_enum wm9712_enum[] = {
 SOC_ENUM_SINGLE(AC97_PCI_SVID, 14, 4, wm9712_alc_select),
 SOC_ENUM_SINGLE(AC97_VIDEO, 12, 4, wm9712_alc_mux),
@@ -147,9 +151,9 @@ SOC_ENUM("Capture Volume Steps", wm9712_enum[6]),
 SOC_DOUBLE("Capture Volume", AC97_REC_GAIN, 8, 0, 63, 1),
 SOC_SINGLE("Capture ZC Switch", AC97_REC_GAIN, 7, 1, 0),
 
-SOC_SINGLE("Mic 1 Volume", AC97_MIC, 8, 31, 1),
-SOC_SINGLE("Mic 2 Volume", AC97_MIC, 0, 31, 1),
-SOC_SINGLE("Mic 20dB Boost Switch", AC97_MIC, 7, 1, 0),
+SOC_SINGLE_TLV("Mic 1 Volume", AC97_MIC, 8, 31, 1, main_tlv),
+SOC_SINGLE_TLV("Mic 2 Volume", AC97_MIC, 0, 31, 1, main_tlv),
+SOC_SINGLE_TLV("Mic Boost Volume", AC97_MIC, 7, 1, 0, boost_tlv),
 };
 
 /* We have to create a fake left and right HP mixers because