linux-kernel - Re: [PATCH v7 2/2] power: supply: bq256xx: Introduce the BQ256XX charger driver

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Date:   Sun, 3 Jan 2021 02:26:10 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Ricardo Rivera-Matos <r-rivera-matos@...com>
Cc:     robh+dt@...nel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dmurphy@...com
Subject: Re: [PATCH v7 2/2] power: supply: bq256xx: Introduce the BQ256XX
 charger driver

Hi Ricardo,

On Wed, Dec 30, 2020 at 05:01:16PM -0600, Ricardo Rivera-Matos wrote:
> The BQ256XX family of devices are highly integrated buck chargers
> for single cell batteries.
> 
> Signed-off-by: Ricardo Rivera-Matos <r-rivera-matos@...com>
> 
> v5 - adds power_supply_put_battery_info() and devm_add_action_or_rest() calls
> 
> v6 - implements bq256xx_remove function
> 
> v7 - applies various fixes
> 
>    - implements clamp() API
> 
>    - implements memcmp() API
> 
>    - changes cache_type to REGACHE_FLAT
> 
>    - changes bq256xx_probe to properly unregister device
> 
> Signed-off-by: Ricardo Rivera-Matos <r-rivera-matos@...com>
> ---

Thanks, looks mostly good now.

>  drivers/power/supply/Kconfig           |   11 +
>  drivers/power/supply/Makefile          |    1 +
>  drivers/power/supply/bq256xx_charger.c | 1747 ++++++++++++++++++++++++
>  3 files changed, 1759 insertions(+)
>  create mode 100644 drivers/power/supply/bq256xx_charger.c
> 
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index 44d3c8512fb8..87d852914bc2 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -618,6 +618,17 @@ config CHARGER_BQ25890
>  	help
>  	  Say Y to enable support for the TI BQ25890 battery charger.
>  
> +config CHARGER_BQ256XX
> +	tristate "TI BQ256XX battery charger driver"
> +	depends on I2C
> +	depends on GPIOLIB || COMPILE_TEST
> +	select REGMAP_I2C
> +	help
> +	  Say Y to enable support for the TI BQ256XX battery chargers. The
> +	  BQ256XX family of devices are highly-integrated, switch-mode battery
> +	  charge management and system power path management devices for single
> +	  cell Li-ion and Li-polymer batteries.
> +
>  config CHARGER_SMB347
>  	tristate "Summit Microelectronics SMB347 Battery Charger"
>  	depends on I2C

Please rebase to current power-supply for-next branch, Kconfig and
Makefile diff does not apply because of one additional BQ device.

> [...]
> +static void bq256xx_usb_work(struct work_struct *data)
> +{
> +	struct bq256xx_device *bq =
> +			container_of(data, struct bq256xx_device, usb_work);
> +
> +	switch (bq->usb_event) {
> +	case USB_EVENT_ID:
> +		break;
> +

spurious newline, please remove!

> +	case USB_EVENT_NONE:
> +		power_supply_changed(bq->charger);
> +		break;
> +	default:
> +		dev_err(bq->dev, "Error switching to charger mode.\n");
> +		break;
> +	}
> +}
> +

> [...]

> +static int bq256xx_hw_init(struct bq256xx_device *bq)
> +{
> +	struct power_supply_battery_info bat_info = { };
> +	int wd_reg_val = BQ256XX_WATCHDOG_DIS;
> +	int ret = 0;
> +	int i;
> +
> +	for (i = 0; i < BQ256XX_NUM_WD_VAL; i++) {
> +		if (bq->watchdog_timer > bq256xx_watchdog_time[i] &&
> +		    bq->watchdog_timer < bq256xx_watchdog_time[i + 1])
> +			wd_reg_val = i;
> +	}
> +	ret = regmap_update_bits(bq->regmap, BQ256XX_CHARGER_CONTROL_1,
> +				 BQ256XX_WATCHDOG_MASK, wd_reg_val <<
> +						BQ256XX_WDT_BIT_SHIFT);
> +
> +	ret = power_supply_get_battery_info(bq->charger, &bat_info);
> +	if (ret) {
> +		dev_warn(bq->dev, "battery info missing, default values will be applied\n");
> +
> +		bat_info.constant_charge_current_max_ua =
> +				bq->chip_info->bq256xx_def_ichg;
> +
> +		bat_info.constant_charge_voltage_max_uv =
> +				bq->chip_info->bq256xx_def_vbatreg;
> +
> +		bat_info.precharge_current_ua =
> +				bq->chip_info->bq256xx_def_iprechg;
> +
> +		bat_info.charge_term_current_ua =
> +				bq->chip_info->bq256xx_def_iterm;
> +
> +		bq->init_data.ichg_max =
> +				bq->chip_info->bq256xx_max_ichg;
> +
> +		bq->init_data.vbatreg_max =
> +				bq->chip_info->bq256xx_max_vbatreg;
> +	} else {
> +		bq->init_data.ichg_max =
> +			bat_info.constant_charge_current_max_ua;
> +
> +		bq->init_data.vbatreg_max =
> +			bat_info.constant_charge_voltage_max_uv;
> +	}
> +
> +	ret = bq->chip_info->bq256xx_set_vindpm(bq, bq->init_data.vindpm);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_iindpm(bq, bq->init_data.iindpm);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_ichg(bq,
> +				bat_info.constant_charge_current_max_ua);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_iprechg(bq,
> +				bat_info.precharge_current_ua);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_vbatreg(bq,
> +				bat_info.constant_charge_voltage_max_uv);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_iterm(bq,
> +				bat_info.charge_term_current_ua);
> +	if (ret)
> +		goto err_out;
> +
> +	power_supply_put_battery_info(bq->charger, &bat_info);
> +
> +	return 0;
> +
> +err_out:
> +	return ret;

please return error code directly instead of adding this useless
goto.

> [...]

-- Sebastian

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