[alsa-devel] [PATCH 2/3] ASoC: ak4104: add regulator consumer support

[Daniel Mack]

The AK4104 has only one power supply, called VDD. Make sure it is
enabled during the life-time of the module.

Signed-off-by: Daniel Mack <zonque at gmail.com>
---
 sound/soc/codecs/ak4104.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/sound/soc/codecs/ak4104.c b/sound/soc/codecs/ak4104.c
index b4819dc..c7a541d 100644
--- a/sound/soc/codecs/ak4104.c
+++ b/sound/soc/codecs/ak4104.c
@@ -11,13 +11,14 @@
 
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <sound/core.h>
-#include <sound/soc.h>
-#include <sound/initval.h>
 #include <linux/spi/spi.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
+#include <linux/regulator/consumer.h>
 #include <sound/asoundef.h>
+#include <sound/core.h>
+#include <sound/soc.h>
+#include <sound/initval.h>
 
 /* AK4104 registers addresses */
 #define AK4104_REG_CONTROL1		0x00
@@ -47,6 +48,7 @@
 
 struct ak4104_private {
 	struct regmap *regmap;
+	struct regulator *regulator;
 };
 
 static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
@@ -176,20 +178,30 @@ static int ak4104_probe(struct snd_soc_codec *codec)
 
 	codec->control_data = ak4104->regmap;
 
+	ret = regulator_enable(ak4104->regulator);
+	if (ret < 0) {
+		dev_err(codec->dev, "Unable to enable regulator: %d\n", ret);
+		return ret;
+	}
+
 	/* set power-up and non-reset bits */
 	ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 				 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
 				 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 	if (ret < 0)
-		return ret;
+		goto exit_disable_regulator;
 
 	/* enable transmitter */
 	ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
 				 AK4104_TX_TXE, AK4104_TX_TXE);
 	if (ret < 0)
-		return ret;
+		goto exit_disable_regulator;
 
 	return 0;
+
+exit_disable_regulator:
+	regulator_disable(ak4104->regulator);
+	return ret;
 }
 
 static int ak4104_remove(struct snd_soc_codec *codec)
@@ -198,6 +210,7 @@ static int ak4104_remove(struct snd_soc_codec *codec)
 
 	regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 			   AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
+	regulator_disable(ak4104->regulator);
 
 	return 0;
 }
@@ -241,6 +254,13 @@ static int ak4104_spi_probe(struct spi_device *spi)
 	if (ak4104 == NULL)
 		return -ENOMEM;
 
+	ak4104->regulator = devm_regulator_get(&spi->dev, "vdd");
+	if (IS_ERR(ak4104->regulator)) {
+		ret = PTR_ERR(ak4104->regulator);
+		dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret);
+		return ret;
+	}
+
 	ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
 	if (IS_ERR(ak4104->regmap)) {
 		ret = PTR_ERR(ak4104->regmap);
-- 
1.8.5.3