[alsa-devel] [PATCH] ASoC: wm8998: Correct handling of input muxes

[Charles Keepax]

Currently, wm8998 has two input mux controls on IN1 and attempts to
switch these together when the A position is configured to be in digital
mode. This is because the digital mode requires pins from both the L and
R channels. However, this doesn't work as intended because whilst the
registers on the chip are changed the corresponding DAPM
representation is only updated for the mux actually being changed by the
user. The DAPM graph being out of sync with the hardware can cause some
odd issues with incorrect things being powered etc.

To avoid this issue and simplify the code somewhat, simply let the user
set the muxes as they desire. If they set an invalid configuration they
might not get audio from the DMIC but most of the chip requires you to
set a valid audio route to get audio.

Signed-off-by: Charles Keepax <ckeepax at opensource.cirrus.com>
---
 sound/soc/codecs/wm8998.c | 84 +++++++++++------------------------------------
 1 file changed, 19 insertions(+), 65 deletions(-)

diff --git a/sound/soc/codecs/wm8998.c b/sound/soc/codecs/wm8998.c
index c59caaa75ba0..2d211dbe7422 100644
--- a/sound/soc/codecs/wm8998.c
+++ b/sound/soc/codecs/wm8998.c
@@ -101,7 +101,7 @@ static int wm8998_asrc_ev(struct snd_soc_dapm_widget *w,
 	return 0;
 }
 
-static int wm8998_in1mux_put(struct snd_kcontrol *kcontrol,
+static int wm8998_inmux_put(struct snd_kcontrol *kcontrol,
 			    struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
@@ -109,84 +109,38 @@ static int wm8998_in1mux_put(struct snd_kcontrol *kcontrol,
 	struct wm8998_priv *wm8998 = snd_soc_codec_get_drvdata(codec);
 	struct arizona *arizona = wm8998->core.arizona;
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
-	unsigned int mux, inmode;
-	unsigned int mode_val, src_val;
+	unsigned int mode_reg, mode_index;
+	unsigned int mux, inmode, src_val, mode_val;
 
 	mux = ucontrol->value.enumerated.item[0];
 	if (mux > 1)
 		return -EINVAL;
 
-	/* L and R registers have same shift and mask */
-	inmode = arizona->pdata.inmode[2 * mux];
-	src_val = mux << ARIZONA_IN1L_SRC_SHIFT;
-	if (inmode & ARIZONA_INMODE_SE)
-		src_val |= 1 << ARIZONA_IN1L_SRC_SE_SHIFT;
-
-	switch (arizona->pdata.inmode[0]) {
-	case ARIZONA_INMODE_DMIC:
-		if (mux)
-			mode_val = 0;	/* B always analogue */
-		else
-			mode_val = 1 << ARIZONA_IN1_MODE_SHIFT;
-
-		snd_soc_update_bits(codec, ARIZONA_IN1L_CONTROL,
-				    ARIZONA_IN1_MODE_MASK, mode_val);
-
-		/* IN1A is digital so L and R must change together */
-		/* src_val setting same for both registers */
-		snd_soc_update_bits(codec,
-				    ARIZONA_ADC_DIGITAL_VOLUME_1L,
-				    ARIZONA_IN1L_SRC_MASK |
-				    ARIZONA_IN1L_SRC_SE_MASK, src_val);
-		snd_soc_update_bits(codec,
-				    ARIZONA_ADC_DIGITAL_VOLUME_1R,
-				    ARIZONA_IN1R_SRC_MASK |
-				    ARIZONA_IN1R_SRC_SE_MASK, src_val);
+	switch (e->reg) {
+	case ARIZONA_ADC_DIGITAL_VOLUME_2L:
+		mode_reg = ARIZONA_IN2L_CONTROL;
+		mode_index = 1 + (2 * mux);
 		break;
 	default:
-		/* both analogue */
-		snd_soc_update_bits(codec,
-				    e->reg,
-				    ARIZONA_IN1L_SRC_MASK |
-				    ARIZONA_IN1L_SRC_SE_MASK,
-				    src_val);
+		mode_reg = ARIZONA_IN1L_CONTROL;
+		mode_index = (2 * mux);
 		break;
 	}
 
-	return snd_soc_dapm_mux_update_power(dapm, kcontrol,
-					     ucontrol->value.enumerated.item[0],
-					     e, NULL);
-}
-
-static int wm8998_in2mux_put(struct snd_kcontrol *kcontrol,
-			    struct snd_ctl_elem_value *ucontrol)
-{
-	struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
-	struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
-	struct wm8998_priv *wm8998 = snd_soc_codec_get_drvdata(codec);
-	struct arizona *arizona = wm8998->core.arizona;
-	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
-	unsigned int mux, inmode, src_val, mode_val;
-
-	mux = ucontrol->value.enumerated.item[0];
-	if (mux > 1)
-		return -EINVAL;
-
-	inmode = arizona->pdata.inmode[1 + (2 * mux)];
+	inmode = arizona->pdata.inmode[mode_index];
 	if (inmode & ARIZONA_INMODE_DMIC)
-		mode_val = 1 << ARIZONA_IN2_MODE_SHIFT;
+		mode_val = 1 << ARIZONA_IN1_MODE_SHIFT;
 	else
 		mode_val = 0;
 
-	src_val = mux << ARIZONA_IN2L_SRC_SHIFT;
+	src_val = mux << ARIZONA_IN1L_SRC_SHIFT;
 	if (inmode & ARIZONA_INMODE_SE)
-		src_val |= 1 << ARIZONA_IN2L_SRC_SE_SHIFT;
+		src_val |= 1 << ARIZONA_IN1L_SRC_SE_SHIFT;
 
-	snd_soc_update_bits(codec, ARIZONA_IN2L_CONTROL,
-			    ARIZONA_IN2_MODE_MASK, mode_val);
+	snd_soc_update_bits(codec, mode_reg, ARIZONA_IN1_MODE_MASK, mode_val);
 
-	snd_soc_update_bits(codec, ARIZONA_ADC_DIGITAL_VOLUME_2L,
-			    ARIZONA_IN2L_SRC_MASK | ARIZONA_IN2L_SRC_SE_MASK,
+	snd_soc_update_bits(codec, e->reg,
+			    ARIZONA_IN1L_SRC_MASK | ARIZONA_IN1L_SRC_SE_MASK,
 			    src_val);
 
 	return snd_soc_dapm_mux_update_power(dapm, kcontrol,
@@ -216,14 +170,14 @@ static SOC_ENUM_SINGLE_DECL(wm8998_in2mux_enum,
 
 static const struct snd_kcontrol_new wm8998_in1mux[2] = {
 	SOC_DAPM_ENUM_EXT("IN1L Mux", wm8998_in1muxl_enum,
-			  snd_soc_dapm_get_enum_double, wm8998_in1mux_put),
+			  snd_soc_dapm_get_enum_double, wm8998_inmux_put),
 	SOC_DAPM_ENUM_EXT("IN1R Mux", wm8998_in1muxr_enum,
-			  snd_soc_dapm_get_enum_double, wm8998_in1mux_put),
+			  snd_soc_dapm_get_enum_double, wm8998_inmux_put),
 };
 
 static const struct snd_kcontrol_new wm8998_in2mux =
 	SOC_DAPM_ENUM_EXT("IN2 Mux", wm8998_in2mux_enum,
-			  snd_soc_dapm_get_enum_double, wm8998_in2mux_put);
+			  snd_soc_dapm_get_enum_double, wm8998_inmux_put);
 
 static DECLARE_TLV_DB_SCALE(ana_tlv, 0, 100, 0);
 static DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
-- 
2.11.0