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Date:	Fri, 2 Oct 2015 16:14:41 +0000
From:	Grigoryev Denis <grigoryev@...twel.ru>
To:	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Lee Jones <lee.jones@...aro.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>
Subject: [PATCH] mfd: tps6105x: Use i2c regmap to access registers

This patch modifies tps6105x and associated function driver to use regmap
instead of operating directly on i2c.

Signed-off-by: Denis Grigoryev <grigoryev@...twel.ru>
---
 drivers/mfd/tps6105x.c                 | 78 ++++++----------------------------
 drivers/regulator/tps6105x-regulator.c | 16 +++----
 include/linux/mfd/tps6105x.h           | 10 ++---
 3 files changed, 24 insertions(+), 80 deletions(-)

diff --git a/drivers/mfd/tps6105x.c b/drivers/mfd/tps6105x.c
index 182ebe0..51c5495 100644
--- a/drivers/mfd/tps6105x.c
+++ b/drivers/mfd/tps6105x.c
@@ -16,7 +16,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
-#include <linux/mutex.h>
+#include <linux/regmap.h>
 #include <linux/gpio.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
@@ -25,73 +25,18 @@
 #include <linux/mfd/core.h>
 #include <linux/mfd/tps6105x.h>
 
-int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value)
-{
-	int ret;
-
-	ret = mutex_lock_interruptible(&tps6105x->lock);
-	if (ret)
-		return ret;
-	ret = i2c_smbus_write_byte_data(tps6105x->client, reg, value);
-	mutex_unlock(&tps6105x->lock);
-	if (ret < 0)
-		return ret;
-
-	return 0;
-}
-EXPORT_SYMBOL(tps6105x_set);
-
-int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf)
-{
-	int ret;
-
-	ret = mutex_lock_interruptible(&tps6105x->lock);
-	if (ret)
-		return ret;
-	ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
-	mutex_unlock(&tps6105x->lock);
-	if (ret < 0)
-		return ret;
-
-	*buf = ret;
-	return 0;
-}
-EXPORT_SYMBOL(tps6105x_get);
-
-/*
- * Masks off the bits in the mask and sets the bits in the bitvalues
- * parameter in one atomic operation
- */
-int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
-			  u8 bitmask, u8 bitvalues)
-{
-	int ret;
-	u8 regval;
-
-	ret = mutex_lock_interruptible(&tps6105x->lock);
-	if (ret)
-		return ret;
-	ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
-	if (ret < 0)
-		goto fail;
-	regval = ret;
-	regval = (~bitmask & regval) | (bitmask & bitvalues);
-	ret = i2c_smbus_write_byte_data(tps6105x->client, reg, regval);
-fail:
-	mutex_unlock(&tps6105x->lock);
-	if (ret < 0)
-		return ret;
-
-	return 0;
-}
-EXPORT_SYMBOL(tps6105x_mask_and_set);
+static struct regmap_config tps6105x_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = TPS6105X_REG_3,
+};
 
 static int tps6105x_startup(struct tps6105x *tps6105x)
 {
 	int ret;
-	u8 regval;
+	unsigned int regval;
 
-	ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
+	ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
 	if (ret)
 		return ret;
 	switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
@@ -165,10 +110,13 @@ static int tps6105x_probe(struct i2c_client *client,
 	if (!tps6105x)
 		return -ENOMEM;
 
+	tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
+	if (IS_ERR(tps6105x->regmap))
+		return PTR_ERR(tps6105x->regmap);
+
 	i2c_set_clientdata(client, tps6105x);
 	tps6105x->client = client;
 	tps6105x->pdata = pdata;
-	mutex_init(&tps6105x->lock);
 
 	ret = tps6105x_startup(tps6105x);
 	if (ret) {
@@ -212,7 +160,7 @@ static int tps6105x_remove(struct i2c_client *client)
 	mfd_remove_devices(&client->dev);
 
 	/* Put chip in shutdown mode */
-	tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
+	regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
 		TPS6105X_REG0_MODE_MASK,
 		TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
 
diff --git a/drivers/regulator/tps6105x-regulator.c b/drivers/regulator/tps6105x-regulator.c
index 3510b3e..ddc4f10 100644
--- a/drivers/regulator/tps6105x-regulator.c
+++ b/drivers/regulator/tps6105x-regulator.c
@@ -14,7 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/err.h>
-#include <linux/i2c.h>
+#include <linux/regmap.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/mfd/core.h>
@@ -33,7 +33,7 @@ static int tps6105x_regulator_enable(struct regulator_dev *rdev)
 	int ret;
 
 	/* Activate voltage mode */
-	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
+	ret = regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
 		TPS6105X_REG0_MODE_MASK,
 		TPS6105X_REG0_MODE_VOLTAGE << TPS6105X_REG0_MODE_SHIFT);
 	if (ret)
@@ -48,7 +48,7 @@ static int tps6105x_regulator_disable(struct regulator_dev *rdev)
 	int ret;
 
 	/* Set into shutdown mode */
-	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
+	ret = regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
 		TPS6105X_REG0_MODE_MASK,
 		TPS6105X_REG0_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
 	if (ret)
@@ -60,10 +60,10 @@ static int tps6105x_regulator_disable(struct regulator_dev *rdev)
 static int tps6105x_regulator_is_enabled(struct regulator_dev *rdev)
 {
 	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
-	u8 regval;
+	unsigned int regval;
 	int ret;
 
-	ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
+	ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
 	if (ret)
 		return ret;
 	regval &= TPS6105X_REG0_MODE_MASK;
@@ -78,10 +78,10 @@ static int tps6105x_regulator_is_enabled(struct regulator_dev *rdev)
 static int tps6105x_regulator_get_voltage_sel(struct regulator_dev *rdev)
 {
 	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
-	u8 regval;
+	unsigned int regval;
 	int ret;
 
-	ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
+	ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
 	if (ret)
 		return ret;
 
@@ -96,7 +96,7 @@ static int tps6105x_regulator_set_voltage_sel(struct regulator_dev *rdev,
 	struct tps6105x *tps6105x = rdev_get_drvdata(rdev);
 	int ret;
 
-	ret = tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
+	ret = regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
 				    TPS6105X_REG0_VOLTAGE_MASK,
 				    selector << TPS6105X_REG0_VOLTAGE_SHIFT);
 	if (ret)
diff --git a/include/linux/mfd/tps6105x.h b/include/linux/mfd/tps6105x.h
index 386743d..8bc5118 100644
--- a/include/linux/mfd/tps6105x.h
+++ b/include/linux/mfd/tps6105x.h
@@ -10,6 +10,7 @@
 #define MFD_TPS6105X_H
 
 #include <linux/i2c.h>
+#include <linux/regmap.h>
 #include <linux/regulator/machine.h>
 
 /*
@@ -82,20 +83,15 @@ struct tps6105x_platform_data {
 
 /**
  * struct tps6105x - state holder for the TPS6105x drivers
- * @mutex: mutex to serialize I2C accesses
  * @i2c_client: corresponding I2C client
  * @regulator: regulator device if used in voltage mode
+ * @regmap: used for i2c communcation on accessing registers
  */
 struct tps6105x {
 	struct tps6105x_platform_data *pdata;
-	struct mutex		lock;
 	struct i2c_client	*client;
 	struct regulator_dev	*regulator;
+	struct regmap		*regmap;
 };
 
-extern int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value);
-extern int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf);
-extern int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
-				 u8 bitmask, u8 bitvalues);
-
 #endif
-- 
1.9.1

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