Re: [PATCH 1/4] regulator: ab8500: Get rid of is_enabled from structab8500_regulator_info

[Lee Jones]

On Sun, 07 Apr 2013, Axel Lin wrote:

> The intention of this patch is to simplify the code.
> 
> Maintain the is_enabled flag is not trivial, it not only needs to set/clear the
> flag in disable()/enable() but also needs to set the flag in is_enable() to get
> initial status. The only benefit of keeping is_enabled flag is just save a
> register read when set_mode(). Remove is_enabled flag makes the code simpler.
> 
> This patch also moves ab8500_regulator_is_enabled() close to
> ab8500_regulator_[en|dis]able functions.
> This is required to avoid a forward declaration because now we call
> ab8500_regulator_is_enabled() in ab8500_regulator_set_mode().
> This change also makes the code better in readability by moving similar
> functions to one place.
> 
> Signed-off-by: Axel Lin <axel.lin@xxxxxxxxxx>

Code looks good to me:

Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>

> ---
>  drivers/regulator/ab8500.c |   72 ++++++++++++++++++++------------------------
>  1 file changed, 32 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c
> index 517305e..9ebd131 100644
> --- a/drivers/regulator/ab8500.c
> +++ b/drivers/regulator/ab8500.c
> @@ -46,7 +46,6 @@ struct ab8500_shared_mode {
>   * @desc: regulator description
>   * @regulator_dev: regulator device
>   * @shared_mode: used when mode is shared between two regulators
> - * @is_enabled: status of regulator (on/off)
>   * @load_lp_uA: maximum load in idle (low power) mode
>   * @update_bank: bank to control on/off
>   * @update_reg: register to control on/off
> @@ -69,7 +68,6 @@ struct ab8500_regulator_info {
>  	struct regulator_desc	desc;
>  	struct regulator_dev	*regulator;
>  	struct ab8500_shared_mode *shared_mode;
> -	bool is_enabled;
>  	int load_lp_uA;
>  	u8 update_bank;
>  	u8 update_reg;
> @@ -259,8 +257,6 @@ static int ab8500_regulator_enable(struct regulator_dev *rdev)
>  		return ret;
>  	}
>  
> -	info->is_enabled = true;
> -
>  	dev_vdbg(rdev_get_dev(rdev),
>  		"%s-enable (bank, reg, mask, value): 0x%x, 0x%x, 0x%x, 0x%x\n",
>  		info->desc.name, info->update_bank, info->update_reg,
> @@ -288,8 +284,6 @@ static int ab8500_regulator_disable(struct regulator_dev *rdev)
>  		return ret;
>  	}
>  
> -	info->is_enabled = false;
> -
>  	dev_vdbg(rdev_get_dev(rdev),
>  		"%s-disable (bank, reg, mask, value): 0x%x, 0x%x, 0x%x, 0x%x\n",
>  		info->desc.name, info->update_bank, info->update_reg,
> @@ -298,6 +292,37 @@ static int ab8500_regulator_disable(struct regulator_dev *rdev)
>  	return ret;
>  }
>  
> +static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
> +{
> +	int ret;
> +	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
> +	u8 regval;
> +
> +	if (info == NULL) {
> +		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = abx500_get_register_interruptible(info->dev,
> +		info->update_bank, info->update_reg, &regval);
> +	if (ret < 0) {
> +		dev_err(rdev_get_dev(rdev),
> +			"couldn't read 0x%x register\n", info->update_reg);
> +		return ret;
> +	}
> +
> +	dev_vdbg(rdev_get_dev(rdev),
> +		"%s-is_enabled (bank, reg, mask, value): 0x%x, 0x%x, 0x%x,"
> +		" 0x%x\n",
> +		info->desc.name, info->update_bank, info->update_reg,
> +		info->update_mask, regval);
> +
> +	if (regval & info->update_mask)
> +		return 1;
> +	else
> +		return 0;
> +}
> +
>  static unsigned int ab8500_regulator_get_optimum_mode(
>  		struct regulator_dev *rdev, int input_uV,
>  		int output_uV, int load_uA)
> @@ -398,7 +423,7 @@ static int ab8500_regulator_set_mode(struct regulator_dev *rdev,
>  		mask = info->update_mask;
>  	}
>  
> -	if (info->is_enabled || dmr) {
> +	if (dmr || ab8500_regulator_is_enabled(rdev)) {
>  		ret = abx500_mask_and_set_register_interruptible(info->dev,
>  			bank, reg, mask, val);
>  		if (ret < 0)
> @@ -464,39 +489,6 @@ static unsigned int ab8500_regulator_get_mode(struct regulator_dev *rdev)
>  	return ret;
>  }
>  
> -static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
> -{
> -	int ret;
> -	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
> -	u8 regval;
> -
> -	if (info == NULL) {
> -		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
> -		return -EINVAL;
> -	}
> -
> -	ret = abx500_get_register_interruptible(info->dev,
> -		info->update_bank, info->update_reg, &regval);
> -	if (ret < 0) {
> -		dev_err(rdev_get_dev(rdev),
> -			"couldn't read 0x%x register\n", info->update_reg);
> -		return ret;
> -	}
> -
> -	dev_vdbg(rdev_get_dev(rdev),
> -		"%s-is_enabled (bank, reg, mask, value): 0x%x, 0x%x, 0x%x,"
> -		" 0x%x\n",
> -		info->desc.name, info->update_bank, info->update_reg,
> -		info->update_mask, regval);
> -
> -	if (regval & info->update_mask)
> -		info->is_enabled = true;
> -	else
> -		info->is_enabled = false;
> -
> -	return info->is_enabled;
> -}
> -
>  static int ab8500_regulator_get_voltage_sel(struct regulator_dev *rdev)
>  {
>  	int ret, val;

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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