Re: [PATCH v5 3/6] power: supply: axp20x_battery: use data struct for variant specific code

[Sebastian Reichel <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

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Hi Quentin,

On Wed, Feb 28, 2018 at 11:35:58AM +0100, Quentin Schulz wrote:
> We used to use IDs to select a function or a feature depending on the
> variant. It's easier to maintain the code by adding data structure
> storing the few differences between variants so that we don't add a pile
> of if conditions.
> 
> Let's use this data structure and update the code to use it.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>
> Reviewed-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
> ---

I applied this, but modified the patch slightly, so that
it actually calls your new set_max_voltage() callback in
axp20x_battery_set_prop(). Please check that the resulting
patch looks correct to you:

https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git/commit/?h=for-next&id=648badd797c762a713b48afc3b67d56abdd0073b

-- Sebastian

>  drivers/power/supply/axp20x_battery.c | 100 +++++++++++++++++----------
>  1 file changed, 66 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c
> index 7494f0f..04a0d91 100644
> --- a/drivers/power/supply/axp20x_battery.c
> +++ b/drivers/power/supply/axp20x_battery.c
> @@ -53,6 +53,16 @@
>  
>  #define AXP20X_V_OFF_MASK		GENMASK(2, 0)
>  
> +struct axp20x_batt_ps;
> +
> +struct axp_data {
> +	int	ccc_scale;
> +	int	ccc_offset;
> +	bool	has_fg_valid;
> +	int	(*get_max_voltage)(struct axp20x_batt_ps *batt, int *val);
> +	int	(*set_max_voltage)(struct axp20x_batt_ps *batt, int val);
> +};
> +
>  struct axp20x_batt_ps {
>  	struct regmap *regmap;
>  	struct power_supply *batt;
> @@ -62,7 +72,7 @@ struct axp20x_batt_ps {
>  	struct iio_channel *batt_v;
>  	/* Maximum constant charge current */
>  	unsigned int max_ccc;
> -	u8 axp_id;
> +	const struct axp_data	*data;
>  };
>  
>  static int axp20x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
> @@ -123,22 +133,6 @@ static int axp22x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
>  	return 0;
>  }
>  
> -static void raw_to_constant_charge_current(struct axp20x_batt_ps *axp, int *val)
> -{
> -	if (axp->axp_id == AXP209_ID)
> -		*val = *val * 100000 + 300000;
> -	else
> -		*val = *val * 150000 + 300000;
> -}
> -
> -static void constant_charge_current_to_raw(struct axp20x_batt_ps *axp, int *val)
> -{
> -	if (axp->axp_id == AXP209_ID)
> -		*val = (*val - 300000) / 100000;
> -	else
> -		*val = (*val - 300000) / 150000;
> -}
> -
>  static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
>  					      int *val)
>  {
> @@ -150,7 +144,7 @@ static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
>  
>  	*val &= AXP20X_CHRG_CTRL1_TGT_CURR;
>  
> -	raw_to_constant_charge_current(axp, val);
> +	*val = *val * axp->data->ccc_scale + axp->data->ccc_offset;
>  
>  	return 0;
>  }
> @@ -269,8 +263,7 @@ static int axp20x_battery_get_prop(struct power_supply *psy,
>  		if (ret)
>  			return ret;
>  
> -		if (axp20x_batt->axp_id == AXP221_ID &&
> -		    !(reg & AXP22X_FG_VALID))
> +		if (axp20x_batt->data->has_fg_valid && !(reg & AXP22X_FG_VALID))
>  			return -EINVAL;
>  
>  		/*
> @@ -281,11 +274,8 @@ static int axp20x_battery_get_prop(struct power_supply *psy,
>  		break;
>  
>  	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
> -		if (axp20x_batt->axp_id == AXP209_ID)
> -			return axp20x_battery_get_max_voltage(axp20x_batt,
> -							      &val->intval);
> -		return axp22x_battery_get_max_voltage(axp20x_batt,
> -						      &val->intval);
> +		return axp20x_batt->data->get_max_voltage(axp20x_batt,
> +							  &val->intval);
>
>  	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
>  		ret = regmap_read(axp20x_batt->regmap, AXP20X_V_OFF, &reg);
> @@ -312,6 +302,32 @@ static int axp20x_battery_get_prop(struct power_supply *psy,
>  	return 0;
>  }
>  
> +static int axp22x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
> +					  int val)
> +{
> +	switch (val) {
> +	case 4100000:
> +		val = AXP20X_CHRG_CTRL1_TGT_4_1V;
> +		break;
> +
> +	case 4200000:
> +		val = AXP20X_CHRG_CTRL1_TGT_4_2V;
> +		break;
> +
> +	default:
> +		/*
> +		 * AXP20x max voltage can be set to 4.36V and AXP22X max voltage
> +		 * can be set to 4.22V and 4.24V, but these voltages are too
> +		 * high for Lithium based batteries (AXP PMICs are supposed to
> +		 * be used with these kinds of battery).
> +		 */
> +		return -EINVAL;
> +	}
> +
> +	return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
> +				  AXP20X_CHRG_CTRL1_TGT_VOLT, val);
> +}
> +
>  static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
>  					  int val)
>  {
> @@ -321,9 +337,6 @@ static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
>  		break;
>  
>  	case 4150000:
> -		if (axp20x_batt->axp_id == AXP221_ID)
> -			return -EINVAL;
> -
>  		val = AXP20X_CHRG_CTRL1_TGT_4_15V;
>  		break;
>  
> @@ -351,7 +364,8 @@ static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt,
>  	if (charge_current > axp_batt->max_ccc)
>  		return -EINVAL;
>  
> -	constant_charge_current_to_raw(axp_batt, &charge_current);
> +	charge_current = (charge_current - axp_batt->data->ccc_offset) /
> +		axp_batt->data->ccc_scale;
>  
>  	if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
>  		return -EINVAL;
> @@ -365,12 +379,14 @@ static int axp20x_set_max_constant_charge_current(struct axp20x_batt_ps *axp,
>  {
>  	bool lower_max = false;
>  
> -	constant_charge_current_to_raw(axp, &charge_current);
> +	charge_current = (charge_current - axp->data->ccc_offset) /
> +		axp->data->ccc_scale;
>  
>  	if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
>  		return -EINVAL;
>  
> -	raw_to_constant_charge_current(axp, &charge_current);
> +	charge_current = charge_current * axp->data->ccc_scale +
> +		axp->data->ccc_offset;
>  
>  	if (charge_current > axp->max_ccc)
>  		dev_warn(axp->dev,
> @@ -460,13 +476,28 @@ static const struct power_supply_desc axp20x_batt_ps_desc = {
>  	.set_property = axp20x_battery_set_prop,
>  };
>  
> +static const struct axp_data axp209_data = {
> +	.ccc_scale = 100000,
> +	.ccc_offset = 300000,
> +	.get_max_voltage = axp20x_battery_get_max_voltage,
> +	.set_max_voltage = axp20x_battery_set_max_voltage,
> +};
> +
> +static const struct axp_data axp221_data = {
> +	.ccc_scale = 150000,
> +	.ccc_offset = 300000,
> +	.has_fg_valid = true,
> +	.get_max_voltage = axp22x_battery_get_max_voltage,
> +	.set_max_voltage = axp22x_battery_set_max_voltage,
> +};
> +
>  static const struct of_device_id axp20x_battery_ps_id[] = {
>  	{
>  		.compatible = "x-powers,axp209-battery-power-supply",
> -		.data = (void *)AXP209_ID,
> +		.data = (void *)&axp209_data,
>  	}, {
>  		.compatible = "x-powers,axp221-battery-power-supply",
> -		.data = (void *)AXP221_ID,
> +		.data = (void *)&axp221_data,
>  	}, { /* sentinel */ },
>  };
>  MODULE_DEVICE_TABLE(of, axp20x_battery_ps_id);
> @@ -476,6 +507,7 @@ static int axp20x_power_probe(struct platform_device *pdev)
>  	struct axp20x_batt_ps *axp20x_batt;
>  	struct power_supply_config psy_cfg = {};
>  	struct power_supply_battery_info info;
> +	struct device *dev = &pdev->dev;
>  
>  	if (!of_device_is_available(pdev->dev.of_node))
>  		return -ENODEV;
> @@ -516,7 +548,7 @@ static int axp20x_power_probe(struct platform_device *pdev)
>  	psy_cfg.drv_data = axp20x_batt;
>  	psy_cfg.of_node = pdev->dev.of_node;
>  
> -	axp20x_batt->axp_id = (uintptr_t)of_device_get_match_data(&pdev->dev);
> +	axp20x_batt->data = (struct axp_data *)of_device_get_match_data(dev);
>  
>  	axp20x_batt->batt = devm_power_supply_register(&pdev->dev,
>  						       &axp20x_batt_ps_desc,
> -- 
> git-series 0.9.1