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Commit 7e507119 authored by Grigoryev Denis's avatar Grigoryev Denis Committed by Lee Jones
Browse files

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: default avatarDenis Grigoryev <grigoryev@fastwel.ru>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 1f93e4a9

drivers/mfd/tps6105x.c

+13 −65
Original line number Diff line number Diff line
@@ -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) {
@@ -145,11 +90,14 @@ 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;

	pdata = dev_get_platdata(&client->dev);

	tps6105x->pdata = pdata;

	mutex_init(&tps6105x->lock);



	ret = tps6105x_startup(tps6105x);

	if (ret) {
@@ -198,7 +146,7 @@ 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);

drivers/regulator/tps6105x-regulator.c

+8 −8
Original line number Diff line number Diff line
@@ -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)

include/linux/mfd/tps6105x.h

+3 −7
Original line number Diff line number Diff line
@@ -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