ASoC: cs42l51: add adc volume control

Add ADC boost volume control for CS42L51 codec.
Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs42l51.c

@@ -123,6 +123,7 @@ static const DECLARE_TLV_DB_SCALE(tone_tlv, -1050, 150, 0);
 static const DECLARE_TLV_DB_SCALE(aout_tlv, -10200, 50, 0);
 
 static const DECLARE_TLV_DB_SCALE(boost_tlv, 1600, 1600, 0);
+static const DECLARE_TLV_DB_SCALE(adc_boost_tlv, 2000, 2000, 0);
 static const char *chan_mix[] = {
 	"L R",
 	"L+R",
@@ -151,6 +152,8 @@ static const struct snd_kcontrol_new cs42l51_snd_controls[] = {
 	SOC_SINGLE("Zero Cross Switch", CS42L51_DAC_CTL, 0, 0, 0),
 	SOC_DOUBLE_TLV("Mic Boost Volume",
 			CS42L51_MIC_CTL, 0, 1, 1, 0, boost_tlv),
+	SOC_DOUBLE_TLV("ADC Boost Volume",
+		       CS42L51_MIC_CTL, 5, 6, 1, 0, adc_boost_tlv),
 	SOC_SINGLE_TLV("Bass Volume", CS42L51_TONE_CTL, 0, 0xf, 1, tone_tlv),
 	SOC_SINGLE_TLV("Treble Volume", CS42L51_TONE_CTL, 4, 0xf, 1, tone_tlv),
 	SOC_ENUM_EXT("PCM channel mixer",