ASoC: tap6130a2: Use regmap

Use regmap instead of open-coding IO access and caching

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
[koike: port for upstream]
Signed-off-by: Helen Koike <helen.koike@collabora.co.uk>
[On N900]
Tested-By: Sebastian Reichel <sre@kernel.org>
Reviewed-By: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 46 insertions, 122 deletions

diff --git a/sound/soc/codecs/tpa6130a2.c b/sound/soc/codecs/tpa6130a2.c
index f31326a..d90388a 100644
--- a/sound/soc/codecs/tpa6130a2.c
+++ b/sound/soc/codecs/tpa6130a2.c
@@ -32,6 +32,7 @@
 #include <sound/tlv.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
+#include <linux/regmap.h>
 
 #include "tpa6130a2.h"
 
@@ -45,92 +46,16 @@ static struct i2c_client *tpa6130a2_client;
 /* This struct is used to save the context */
 struct tpa6130a2_data {
 	struct mutex mutex;
-	unsigned char regs[TPA6130A2_CACHEREGNUM];
+	struct regmap *regmap;
 	struct regulator *supply;
 	int power_gpio;
 	u8 power_state:1;
 	enum tpa_model id;
 };
 
-static int tpa6130a2_i2c_read(int reg)
-{
-	struct tpa6130a2_data *data;
-	int val;
-
-	if (WARN_ON(!tpa6130a2_client))
-		return -EINVAL;
-	data = i2c_get_clientdata(tpa6130a2_client);
-
-	/* If powered off, return the cached value */
-	if (data->power_state) {
-		val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
-		if (val < 0)
-			dev_err(&tpa6130a2_client->dev, "Read failed\n");
-		else
-			data->regs[reg] = val;
-	} else {
-		val = data->regs[reg];
-	}
-
-	return val;
-}
-
-static int tpa6130a2_i2c_write(int reg, u8 value)
-{
-	struct tpa6130a2_data *data;
-	int val = 0;
-
-	if (WARN_ON(!tpa6130a2_client))
-		return -EINVAL;
-	data = i2c_get_clientdata(tpa6130a2_client);
-
-	if (data->power_state) {
-		val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
-		if (val < 0) {
-			dev_err(&tpa6130a2_client->dev, "Write failed\n");
-			return val;
-		}
-	}
-
-	/* Either powered on or off, we save the context */
-	data->regs[reg] = value;
-
-	return val;
-}
-
-static u8 tpa6130a2_read(int reg)
-{
-	struct tpa6130a2_data *data;
-
-	if (WARN_ON(!tpa6130a2_client))
-		return 0;
-	data = i2c_get_clientdata(tpa6130a2_client);
-
-	return data->regs[reg];
-}
-
-static int tpa6130a2_initialize(void)
-{
-	struct tpa6130a2_data *data;
-	int i, ret = 0;
-
-	if (WARN_ON(!tpa6130a2_client))
-		return -EINVAL;
-	data = i2c_get_clientdata(tpa6130a2_client);
-
-	for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
-		ret = tpa6130a2_i2c_write(i, data->regs[i]);
-		if (ret < 0)
-			break;
-	}
-
-	return ret;
-}
-
 static int tpa6130a2_power(u8 power)
 {
 	struct	tpa6130a2_data *data;
-	u8	val;
 	int	ret = 0;
 
 	if (WARN_ON(!tpa6130a2_client))
@@ -153,7 +78,7 @@ static int tpa6130a2_power(u8 power)
 			gpio_set_value(data->power_gpio, 1);
 
 		data->power_state = 1;
-		ret = tpa6130a2_initialize();
+		ret = regcache_sync(data->regmap);
 		if (ret < 0) {
 			dev_err(&tpa6130a2_client->dev,
 				"Failed to initialize chip\n");
@@ -165,9 +90,8 @@ static int tpa6130a2_power(u8 power)
 		}
 	} else {
 		/* set SWS */
-		val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
-		val |= TPA6130A2_SWS;
-		tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
+		regmap_update_bits(data->regmap, TPA6130A2_REG_CONTROL,
+			TPA6130A2_SWS, TPA6130A2_SWS);
 
 		/* Power off */
 		if (data->power_gpio >= 0)
@@ -181,6 +105,8 @@ static int tpa6130a2_power(u8 power)
 		}
 
 		data->power_state = 0;
+		/* device regs does not match the cache state anymore */
+		regcache_mark_dirty(data->regmap);
 	}
 
 exit:
@@ -196,7 +122,7 @@ static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
 	struct tpa6130a2_data *data;
 	unsigned int reg = mc->reg;
 	unsigned int shift = mc->shift;
-	int max = mc->max;
+	int max = mc->max, val;
 	unsigned int mask = (1 << fls(max)) - 1;
 	unsigned int invert = mc->invert;
 
@@ -206,8 +132,8 @@ static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
 
 	mutex_lock(&data->mutex);
 
-	ucontrol->value.integer.value[0] =
-		(tpa6130a2_read(reg) >> shift) & mask;
+	regmap_read(data->regmap, reg, &val);
+	ucontrol->value.integer.value[0] = (val >> shift) & mask;
 
 	if (invert)
 		ucontrol->value.integer.value[0] =
@@ -229,7 +155,7 @@ static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
 	unsigned int mask = (1 << fls(max)) - 1;
 	unsigned int invert = mc->invert;
 	unsigned int val = (ucontrol->value.integer.value[0] & mask);
-	unsigned int val_reg;
+	bool change;
 
 	if (WARN_ON(!tpa6130a2_client))
 		return -EINVAL;
@@ -239,20 +165,11 @@ static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
 		val = max - val;
 
 	mutex_lock(&data->mutex);
-
-	val_reg = tpa6130a2_read(reg);
-	if (((val_reg >> shift) & mask) == val) {
-		mutex_unlock(&data->mutex);
-		return 0;
-	}
-
-	val_reg &= ~(mask << shift);
-	val_reg |= val << shift;
-	tpa6130a2_i2c_write(reg, val_reg);
-
+	regmap_update_bits_check(data->regmap, reg, mask << shift, val << shift,
+				 &change);
 	mutex_unlock(&data->mutex);
 
-	return 1;
+	return change;
 }
 
 /*
@@ -301,31 +218,26 @@ static const struct snd_kcontrol_new tpa6140a2_controls[] = {
  */
 static void tpa6130a2_channel_enable(u8 channel, int enable)
 {
-	u8	val;
+	struct tpa6130a2_data *data = i2c_get_clientdata(tpa6130a2_client);
 
 	if (enable) {
 		/* Enable channel */
 		/* Enable amplifier */
-		val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
-		val |= channel;
-		val &= ~TPA6130A2_SWS;
-		tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
+		regmap_update_bits(data->regmap, TPA6130A2_REG_CONTROL,
+			channel | TPA6130A2_SWS, channel & ~TPA6130A2_SWS);
 
 		/* Unmute channel */
-		val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
-		val &= ~channel;
-		tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
+		regmap_update_bits(data->regmap, TPA6130A2_REG_VOL_MUTE,
+				   channel, 0);
 	} else {
 		/* Disable channel */
 		/* Mute channel */
-		val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
-		val |= channel;
-		tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
+		regmap_update_bits(data->regmap, TPA6130A2_REG_VOL_MUTE,
+				   channel, channel);
 
 		/* Disable amplifier */
-		val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
-		val &= ~channel;
-		tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
+		regmap_update_bits(data->regmap, TPA6130A2_REG_CONTROL,
+				   channel, 0);
 	}
 }
 
@@ -365,6 +277,20 @@ struct snd_soc_component_driver tpa6130a2_component_driver = {
 	.probe = tpa6130a2_component_probe,
 };
 
+static const struct reg_default tpa6130a2_reg_defaults[] = {
+	{ TPA6130A2_REG_CONTROL, TPA6130A2_SWS },
+	{ TPA6130A2_REG_VOL_MUTE, TPA6130A2_MUTE_R | TPA6130A2_MUTE_L },
+};
+
+static const struct regmap_config tpa6130a2_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = TPA6130A2_REG_VERSION,
+	.reg_defaults = tpa6130a2_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(tpa6130a2_reg_defaults),
+	.cache_type = REGCACHE_RBTREE,
+};
+
 static int tpa6130a2_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
@@ -373,6 +299,7 @@ static int tpa6130a2_probe(struct i2c_client *client,
 	struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
 	struct device_node *np = client->dev.of_node;
 	const char *regulator;
+	unsigned int version;
 	int ret;
 
 	dev = &client->dev;
@@ -381,6 +308,10 @@ static int tpa6130a2_probe(struct i2c_client *client,
 	if (!data)
 		return -ENOMEM;
 
+	data->regmap = devm_regmap_init_i2c(client, &tpa6130a2_regmap_config);
+	if (IS_ERR(data->regmap))
+		return PTR_ERR(data->regmap);
+
 	if (pdata) {
 		data->power_gpio = pdata->power_gpio;
 	} else if (np) {
@@ -399,11 +330,6 @@ static int tpa6130a2_probe(struct i2c_client *client,
 
 	mutex_init(&data->mutex);
 
-	/* Set default register values */
-	data->regs[TPA6130A2_REG_CONTROL] =	TPA6130A2_SWS;
-	data->regs[TPA6130A2_REG_VOL_MUTE] =	TPA6130A2_MUTE_R |
-						TPA6130A2_MUTE_L;
-
 	if (data->power_gpio >= 0) {
 		ret = devm_gpio_request(dev, data->power_gpio,
 					"tpa6130a2 enable");
@@ -440,10 +366,10 @@ static int tpa6130a2_probe(struct i2c_client *client,
 
 
 	/* Read version */
-	ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
-				 TPA6130A2_VERSION_MASK;
-	if ((ret != 1) && (ret != 2))
-		dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
+	regmap_read(data->regmap, TPA6130A2_REG_VERSION, &version);
+	version &= TPA6130A2_VERSION_MASK;
+	if ((version != 1) && (version != 2))
+		dev_warn(dev, "UNTESTED version detected (%d)\n", version);
 
 	/* Disable the chip */
 	ret = tpa6130a2_power(0);
diff --git a/sound/soc/codecs/tpa6130a2.h b/sound/soc/codecs/tpa6130a2.h
index 78ee723..ef05a3f 100644
--- a/sound/soc/codecs/tpa6130a2.h
+++ b/sound/soc/codecs/tpa6130a2.h
@@ -30,8 +30,6 @@
 #define TPA6130A2_REG_OUT_IMPEDANCE	0x03
 #define TPA6130A2_REG_VERSION		0x04
 
-#define TPA6130A2_CACHEREGNUM	(TPA6130A2_REG_VERSION + 1)
-
 /* Register bits */
 /* TPA6130A2_REG_CONTROL (0x01) */
 #define TPA6130A2_SWS			(0x01 << 0)