Date:	Mon, 5 Oct 2015 10:42:50 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Grigoryev Denis <grigoryev@...twel.ru>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>
Subject: Re: [PATCH] mfd: tps6105x: Use i2c regmap to access registers

On Fri, 02 Oct 2015, Grigoryev Denis wrote:

> 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(-)

Applied, thanks.

> 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

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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