ASoC: tas571x: add input channel mixer for TAS5717/19

Add channel 1 and 2 input mixer registers and the related ALSA mixer
controls for TAS5717/19 chips.

The mixer control coefficients on the chip are linear in the range
-3.99999 to +3.99999, encoded in 3.23 number format.
In this patch the mixer controls are limited to 128 values
from 0.0 to 1.0 in 1/64 steps.

Signed-off-by: Petr Kulhavy <brain@jikos.cz>
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 23 insertions, 0 deletions

diff --git a/sound/soc/codecs/tas571x.c b/sound/soc/codecs/tas571x.c
index bc1fbafb8ea4..d8baca3f8413 100644
--- a/sound/soc/codecs/tas571x.c
+++ b/sound/soc/codecs/tas571x.c
@@ -64,6 +64,10 @@ static int tas571x_register_size(struct tas571x_private *priv, unsigned int reg)
         case TAS571X_INPUT_MUX_REG:
         case TAS571X_CH4_SRC_SELECT_REG:
         case TAS571X_PWM_MUX_REG:
+        case TAS5717_CH1_RIGHT_CH_MIX_REG:
+        case TAS5717_CH1_LEFT_CH_MIX_REG:
+        case TAS5717_CH2_LEFT_CH_MIX_REG:
+        case TAS5717_CH2_RIGHT_CH_MIX_REG:
                 return 4;
         default:
                 return 1;
@@ -397,6 +401,16 @@ static const struct snd_kcontrol_new tas5711_controls[] = {
                    TAS571X_SOFT_MUTE_REG,
                    TAS571X_SOFT_MUTE_CH1_SHIFT, TAS571X_SOFT_MUTE_CH2_SHIFT,
                    1, 1),
+
+        SOC_DOUBLE_R_RANGE("CH1 Mixer Volume",
+                           TAS5717_CH1_LEFT_CH_MIX_REG,
+                           TAS5717_CH1_RIGHT_CH_MIX_REG,
+                           16, 0, 0x80, 0),
+
+        SOC_DOUBLE_R_RANGE("CH2 Mixer Volume",
+                           TAS5717_CH2_LEFT_CH_MIX_REG,
+                           TAS5717_CH2_RIGHT_CH_MIX_REG,
+                           16, 0, 0x80, 0),
 };
 
 static const struct regmap_range tas571x_readonly_regs_range[] = {
@@ -520,6 +534,10 @@ static const struct reg_default tas5717_reg_defaults[] = {
         { 0x08, 0x00c0 },
         { 0x09, 0x00c0 },
         { 0x1b, 0x82 },
+        { TAS5717_CH1_RIGHT_CH_MIX_REG, 0x0 },
+        { TAS5717_CH1_LEFT_CH_MIX_REG, 0x800000},
+        { TAS5717_CH2_LEFT_CH_MIX_REG, 0x0 },
+        { TAS5717_CH2_RIGHT_CH_MIX_REG, 0x800000},
 };
 
 static const struct regmap_config tas5717_regmap_config = {
diff --git a/sound/soc/codecs/tas571x.h b/sound/soc/codecs/tas571x.h
index bf4d4362c784..c45677bc26ad 100644
--- a/sound/soc/codecs/tas571x.h
+++ b/sound/soc/codecs/tas571x.h
@@ -87,4 +87,9 @@
 #define TAS5717_CH3_BQ0_REG             0x5e
 #define TAS5717_CH3_BQ1_REG             0x5f
 
+#define TAS5717_CH1_RIGHT_CH_MIX_REG    0x72
+#define TAS5717_CH1_LEFT_CH_MIX_REG     0x73
+#define TAS5717_CH2_LEFT_CH_MIX_REG     0x76
+#define TAS5717_CH2_RIGHT_CH_MIX_REG    0x77
+
 #endif /* _TAS571X_H */