[alsa-devel] [PATCH] audio: sgtl5000: Add MicBias resistor support in DT

[Jean-Michel Hautbois]

Some systems may require a different resistor than the default one (4K).
This adds a property in sgtl5000 codec.
It keeps the default of 4K when nothing is specified so it does not break
existing code.

Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois at vodalys.com>
---
 .../devicetree/bindings/sound/sgtl5000.txt         | 10 ++++
 sound/soc/codecs/sgtl5000.c                        | 56 ++++++++++++++++++++--
 2 files changed, 62 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/sgtl5000.txt b/Documentation/devicetree/bindings/sound/sgtl5000.txt
index 955df60..dd38f84 100644
--- a/Documentation/devicetree/bindings/sound/sgtl5000.txt
+++ b/Documentation/devicetree/bindings/sound/sgtl5000.txt
@@ -7,10 +7,20 @@ Required properties:
 
 - clocks : the clock provider of SYS_MCLK
 
+- sgtl5000-micbias-resistor : the bias resistor to be used
+        1 or SGTL5000_MICBIAS_2K - MICBIAS resistor is set to 2K
+        2 or SGTL5000_MICBIAS_4K - MICBIAS resistor is set to 4K
+        3 or SGTL5000_MICBIAS_8K - MICBIAS resistor is set to 8K
+        0 or SGTL5000_MICBIAS_OFF - MICBIAS resistor is not used
+	If this node is not mentioned or if the value is unknown, then
+	micbias	resistor is set to 4K.
+
+
 Example:
 
 codec: sgtl5000 at 0a {
 	compatible = "fsl,sgtl5000";
 	reg = <0x0a>;
 	clocks = <&clks 150>;
+	sgtl5000-micbias-resistor = <1>;
 };
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 6bb77d7..f538957 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -121,6 +121,13 @@ struct ldo_regulator {
 	bool enabled;
 };
 
+enum sgtl5000_micbias_resistor {
+	SGTL5000_MICBIAS_OFF = 0,
+	SGTL5000_MICBIAS_2K = 1,
+	SGTL5000_MICBIAS_4K = 2,
+	SGTL5000_MICBIAS_8K = 3,
+};
+
 /* sgtl5000 private structure in codec */
 struct sgtl5000_priv {
 	int sysclk;	/* sysclk rate */
@@ -131,6 +138,7 @@ struct sgtl5000_priv {
 	struct regmap *regmap;
 	struct clk *mclk;
 	int revision;
+	enum sgtl5000_micbias_resistor micbias_resistor;
 };
 
 /*
@@ -145,12 +153,14 @@ struct sgtl5000_priv {
 static int mic_bias_event(struct snd_soc_dapm_widget *w,
 	struct snd_kcontrol *kcontrol, int event)
 {
+	struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(w->codec);
+
 	switch (event) {
 	case SND_SOC_DAPM_POST_PMU:
-		/* change mic bias resistor to 4Kohm */
+		/* change mic bias resistor */
 		snd_soc_update_bits(w->codec, SGTL5000_CHIP_MIC_CTRL,
-				SGTL5000_BIAS_R_MASK,
-				SGTL5000_BIAS_R_4k << SGTL5000_BIAS_R_SHIFT);
+			SGTL5000_BIAS_R_MASK,
+			sgtl5000->micbias_resistor << SGTL5000_BIAS_R_SHIFT);
 		break;
 
 	case SND_SOC_DAPM_PRE_PMD:
@@ -1326,7 +1336,16 @@ static int sgtl5000_probe(struct snd_soc_codec *codec)
 			SGTL5000_HP_ZCD_EN |
 			SGTL5000_ADC_ZCD_EN);
 
-	snd_soc_write(codec, SGTL5000_CHIP_MIC_CTRL, 2);
+	switch (sgtl5000->micbias_resistor) {
+	case SGTL5000_MICBIAS_2K:
+	case SGTL5000_MICBIAS_4K:
+	case SGTL5000_MICBIAS_8K:
+		snd_soc_update_bits(codec, SGTL5000_CHIP_MIC_CTRL,
+			SGTL5000_BIAS_R_MASK,
+			sgtl5000->micbias_resistor << SGTL5000_BIAS_R_SHIFT);
+	default:
+		break;
+	}
 
 	/*
 	 * disable DAP
@@ -1418,6 +1437,8 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
 	struct sgtl5000_priv *sgtl5000;
 	int ret, reg, rev;
 	unsigned int mclk;
+	struct device_node *np = client->dev.of_node;
+	u32 value;
 
 	sgtl5000 = devm_kzalloc(&client->dev, sizeof(struct sgtl5000_priv),
 								GFP_KERNEL);
@@ -1470,6 +1491,33 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
 	dev_info(&client->dev, "sgtl5000 revision 0x%x\n", rev);
 	sgtl5000->revision = rev;
 
+	if (np) {
+		if (!of_property_read_u32(np,
+			"sgtl5000-micbias-resistor", &value)) {
+			switch (value) {
+			case 1:
+				sgtl5000->micbias_resistor =
+					SGTL5000_MICBIAS_2K;
+				break;
+			case 2:
+				sgtl5000->micbias_resistor =
+					SGTL5000_MICBIAS_4K;
+				break;
+			case 3:
+				sgtl5000->micbias_resistor =
+					SGTL5000_MICBIAS_8K;
+				break;
+			default:
+				sgtl5000->micbias_resistor =
+					SGTL5000_MICBIAS_OFF;
+				dev_err(&client->dev,
+					"Unsuitable MicBias resistor\n");
+			}
+		} else {
+			sgtl5000->micbias_resistor = SGTL5000_MICBIAS_4K;
+		}
+	}
+
 	i2c_set_clientdata(client, sgtl5000);
 
 	/* Ensure sgtl5000 will start with sane register values */
-- 
2.1.1