[PATCH RESEND,v2] ASoC: mediatek: mt6358: Add "Dmic Mode Switch" kcontrol for switch DMIC mode.

[Jiaxin Yu]

There are two hardware connection methods for DMICs on the MT6358. In cases
where more than two DMICs are used, we need to time-multiplex these DMICs.
Therefore, we need to dynamically switch the modes of these DMICs based on
the actual usage scenarios.

            ---- DMIC1
AU_VIN0 ---
            ---- DMIC2

AU_VIN2 --- ----DMIC3

When we want to use DMIC1/2, configure it to one-wire mode. When we want to
use DMIC1/3, configure it to two-wire mode.

Signed-off-by: Jiaxin Yu <jiaxin.yu at mediatek.com>
---
Changes in v2:
  - fix potential mixter-text errors, only allowing the user to set it
  to 0 or 1.

 sound/soc/codecs/mt6358.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/mt6358.c b/sound/soc/codecs/mt6358.c
index 0284e29c11d3..9247b90d1b99 100644
--- a/sound/soc/codecs/mt6358.c
+++ b/sound/soc/codecs/mt6358.c
@@ -96,7 +96,7 @@ struct mt6358_priv {
 
 	int wov_enabled;
 
-	unsigned int dmic_one_wire_mode;
+	int dmic_one_wire_mode;
 };
 
 int mt6358_set_mtkaif_protocol(struct snd_soc_component *cmpnt,
@@ -577,6 +577,39 @@ static int mt6358_put_wov(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
+static int mt6358_dmic_mode_get(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
+	struct mt6358_priv *priv = snd_soc_component_get_drvdata(c);
+
+	ucontrol->value.integer.value[0] = priv->dmic_one_wire_mode;
+	dev_dbg(priv->dev, "%s() dmic_mode = %d", __func__, priv->dmic_one_wire_mode);
+
+	return 0;
+}
+
+static int mt6358_dmic_mode_set(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
+	struct mt6358_priv *priv = snd_soc_component_get_drvdata(c);
+	int enabled = ucontrol->value.integer.value[0];
+
+	if (enabled < 0 || enabled > 1)
+		return -EINVAL;
+
+	if (priv->dmic_one_wire_mode != enabled) {
+		priv->dmic_one_wire_mode = enabled;
+		dev_dbg(priv->dev, "%s() dmic_mode = %d", __func__, priv->dmic_one_wire_mode);
+
+		return 1;
+	}
+	dev_dbg(priv->dev, "%s() dmic_mode = %d", __func__, priv->dmic_one_wire_mode);
+
+	return 0;
+}
+
 static const DECLARE_TLV_DB_SCALE(playback_tlv, -1000, 100, 0);
 static const DECLARE_TLV_DB_SCALE(pga_tlv, 0, 600, 0);
 
@@ -599,6 +632,9 @@ static const struct snd_kcontrol_new mt6358_snd_controls[] = {
 
 	SOC_SINGLE_BOOL_EXT("Wake-on-Voice Phase2 Switch", 0,
 			    mt6358_get_wov, mt6358_put_wov),
+
+	SOC_SINGLE_BOOL_EXT("Dmic Mode Switch", 0,
+			    mt6358_dmic_mode_get, mt6358_dmic_mode_set),
 };
 
 /* MUX */
-- 
2.25.1