From f77b6ea70f3a672092e2d7eca2e67be09c0b8c54 Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Wed, 3 Apr 2019 15:23:32 +0200
Subject: [PATCH] ASoC: cs42l51: add regulator management

Add cs42l51 audio codec power supply management
through regulator framework.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/codecs/cs42l51-i2c.c |  6 ++++++
 sound/soc/codecs/cs42l51.c     | 44 +++++++++++++++++++++++++++++++++++++++++-
 sound/soc/codecs/cs42l51.h     |  1 +
 3 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cs42l51-i2c.c b/sound/soc/codecs/cs42l51-i2c.c
index 4b5731a..8333dbf 100644
--- a/sound/soc/codecs/cs42l51-i2c.c
+++ b/sound/soc/codecs/cs42l51-i2c.c
@@ -35,12 +35,18 @@ static int cs42l51_i2c_probe(struct i2c_client *i2c,
 	return cs42l51_probe(&i2c->dev, devm_regmap_init_i2c(i2c, &config));
 }
 
+static int cs42l51_i2c_remove(struct i2c_client *i2c)
+{
+	return cs42l51_remove(&i2c->dev);
+}
+
 static struct i2c_driver cs42l51_i2c_driver = {
 	.driver = {
 		.name = "cs42l51",
 		.of_match_table = cs42l51_of_match,
 	},
 	.probe = cs42l51_i2c_probe,
+	.remove = cs42l51_i2c_remove,
 	.id_table = cs42l51_i2c_id,
 };
 
diff --git a/sound/soc/codecs/cs42l51.c b/sound/soc/codecs/cs42l51.c
index 80da3cd..f43eb51 100644
--- a/sound/soc/codecs/cs42l51.c
+++ b/sound/soc/codecs/cs42l51.c
@@ -31,6 +31,7 @@
 #include <sound/pcm_params.h>
 #include <sound/pcm.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 
 #include "cs42l51.h"
 
@@ -40,11 +41,19 @@ enum master_slave_mode {
 	MODE_MASTER,
 };
 
+static const char * const cs42l51_supply_names[] = {
+	"VL",
+	"VD",
+	"VA",
+	"VAHP",
+};
+
 struct cs42l51_private {
 	unsigned int mclk;
 	struct clk *mclk_handle;
 	unsigned int audio_mode;	/* The mode (I2S or left-justified) */
 	enum master_slave_mode func;
+	struct regulator_bulk_data supplies[ARRAY_SIZE(cs42l51_supply_names)];
 };
 
 #define CS42L51_FORMATS ( \
@@ -550,7 +559,7 @@ int cs42l51_probe(struct device *dev, struct regmap *regmap)
 {
 	struct cs42l51_private *cs42l51;
 	unsigned int val;
-	int ret;
+	int ret, i;
 
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
@@ -569,6 +578,23 @@ int cs42l51_probe(struct device *dev, struct regmap *regmap)
 		cs42l51->mclk_handle = NULL;
 	}
 
+	for (i = 0; i < ARRAY_SIZE(cs42l51->supplies); i++)
+		cs42l51->supplies[i].supply = cs42l51_supply_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(cs42l51->supplies),
+				      cs42l51->supplies);
+	if (ret != 0) {
+		dev_err(dev, "Failed to request supplies: %d\n", ret);
+		return ret;
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(cs42l51->supplies),
+				    cs42l51->supplies);
+	if (ret != 0) {
+		dev_err(dev, "Failed to enable supplies: %d\n", ret);
+		return ret;
+	}
+
 	/* Verify that we have a CS42L51 */
 	ret = regmap_read(regmap, CS42L51_CHIP_REV_ID, &val);
 	if (ret < 0) {
@@ -587,11 +613,27 @@ int cs42l51_probe(struct device *dev, struct regmap *regmap)
 
 	ret = devm_snd_soc_register_component(dev,
 			&soc_component_device_cs42l51, &cs42l51_dai, 1);
+	if (ret < 0)
+		goto error;
+
+	return 0;
+
 error:
+	regulator_bulk_disable(ARRAY_SIZE(cs42l51->supplies),
+			       cs42l51->supplies);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(cs42l51_probe);
 
+int cs42l51_remove(struct device *dev)
+{
+	struct cs42l51_private *cs42l51 = dev_get_drvdata(dev);
+
+	return regulator_bulk_disable(ARRAY_SIZE(cs42l51->supplies),
+				      cs42l51->supplies);
+}
+EXPORT_SYMBOL_GPL(cs42l51_remove);
+
 const struct of_device_id cs42l51_of_match[] = {
 	{ .compatible = "cirrus,cs42l51", },
 	{ }
diff --git a/sound/soc/codecs/cs42l51.h b/sound/soc/codecs/cs42l51.h
index 0ca8054..aef0ede 100644
--- a/sound/soc/codecs/cs42l51.h
+++ b/sound/soc/codecs/cs42l51.h
@@ -22,6 +22,7 @@ struct device;
 
 extern const struct regmap_config cs42l51_regmap;
 int cs42l51_probe(struct device *dev, struct regmap *regmap);
+int cs42l51_remove(struct device *dev);
 extern const struct of_device_id cs42l51_of_match[];
 
 #define CS42L51_CHIP_ID			0x1B
-- 
2.7.4