[PATCH] mfd: tps6105x: Use i2c regmap to access registers

From: Grigoryev Denis
Date: Fri Oct 02 2015 - 12:14:50 EST

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

Signed-off-by: Denis Grigoryev <grigoryev@xxxxxxxxxx>
---
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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Next in thread: Mark Brown: "Re: [PATCH] mfd: tps6105x: Use i2c regmap to access registers"
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