ASoC: TWL4030: Add volume controls for outputs

All outputs have dedicated gain controls except the
HandsFree output.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/twl4030.c

@@ -366,6 +366,12 @@ static DECLARE_TLV_DB_SCALE(digital_coarse_tlv, 0, 600, 0);
  */
 static DECLARE_TLV_DB_SCALE(analog_tlv, -2400, 200, 0);
 
+/*
+ * Gain controls tied to outputs
+ * -6 dB to 6 dB in 6 dB steps (mute instead of -12)
+ */
+static DECLARE_TLV_DB_SCALE(output_tvl, -1200, 600, 1);
+
 /*
  * Capture gain after the ADCs
  * from 0 dB to 31 dB in 1 dB steps
@@ -395,6 +401,21 @@ static const struct snd_kcontrol_new twl4030_snd_controls[] = {
 		TWL4030_REG_ARXL2_APGA_CTL, TWL4030_REG_ARXR2_APGA_CTL,
 		3, 0x12, 1, analog_tlv),
 
+	/* Separate output gain controls */
+	SOC_DOUBLE_R_TLV_TWL4030("PreDriv Playback Volume",
+		TWL4030_REG_PREDL_CTL, TWL4030_REG_PREDR_CTL,
+		4, 3, 0, output_tvl),
+
+	SOC_DOUBLE_TLV_TWL4030("Headset Playback Volume",
+		TWL4030_REG_HS_GAIN_SET, 0, 2, 3, 0, output_tvl),
+
+	SOC_DOUBLE_R_TLV_TWL4030("Carkit Playback Volume",
+		TWL4030_REG_PRECKL_CTL, TWL4030_REG_PRECKR_CTL,
+		4, 3, 0, output_tvl),
+
+	SOC_SINGLE_TLV_TWL4030("Earpiece Playback Volume",
+		TWL4030_REG_EAR_CTL, 4, 3, 0, output_tvl),
+
 	/* Common capture gain controls */
 	SOC_DOUBLE_R_TLV("Capture Volume",
 		TWL4030_REG_ATXL1PGA, TWL4030_REG_ATXR1PGA,