Re: [PATCH v2 09/14] power: supply: bq24190_charger: Export 5V boost converter as regulator

[Sebastian Reichel <sebastian.reichel@collabora.co.uk>]

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Hi,

On Tue, Aug 15, 2017 at 10:04:57PM +0200, Hans de Goede wrote:
> Register the 5V boost converter as a regulator named "usb_otg_vbus".
> 
> This commit also adds support for bq24190_platform_data, through which
> non device-tree platforms can pass the regulator_init_data (containing
> mappings for the consumer amongst other things).
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> Changes in v2:
> -Use "usb_otg_vbus" as default name for the regulator
> -Add support for passing regulator_init_data for non device-tree platforms
> -Register the regulator later, to avoid it showing up and shortly later
>  disappearing again on probe errors (e.g. -EPROBE_DEFER).
> ---
>  drivers/power/supply/bq24190_charger.c | 126 +++++++++++++++++++++++++++++++++
>  include/linux/power/bq24190_charger.h  |  18 +++++
>  2 files changed, 144 insertions(+)
>  create mode 100644 include/linux/power/bq24190_charger.h
> 
> diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
> index d5a707e..073cd9d 100644
> --- a/drivers/power/supply/bq24190_charger.c
> +++ b/drivers/power/supply/bq24190_charger.c
> @@ -16,6 +16,9 @@
>  #include <linux/of_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/power_supply.h>
> +#include <linux/power/bq24190_charger.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/machine.h>
>  #include <linux/workqueue.h>
>  #include <linux/gpio.h>
>  #include <linux/i2c.h>
> @@ -504,6 +507,125 @@ static int bq24190_sysfs_create_group(struct bq24190_dev_info *bdi)
>  static inline void bq24190_sysfs_remove_group(struct bq24190_dev_info *bdi) {}
>  #endif
>  
> +#ifdef CONFIG_REGULATOR
> +
> +static int bq24190_vbus_enable(struct regulator_dev *dev)
> +{
> +	struct bq24190_dev_info *bdi = rdev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = pm_runtime_get_sync(bdi->dev);
> +	if (ret < 0) {
> +		dev_warn(bdi->dev, "pm_runtime_get failed: %i\n", ret);
> +		pm_runtime_put_noidle(bdi->dev);
> +		return ret;
> +	}
> +
> +	ret = bq24190_write_mask(bdi, BQ24190_REG_POC,
> +				 BQ24190_REG_POC_CHG_CONFIG_MASK,
> +				 BQ24190_REG_POC_CHG_CONFIG_SHIFT,
> +				 BQ24190_REG_POC_CHG_CONFIG_OTG);
> +
> +	pm_runtime_mark_last_busy(bdi->dev);
> +	pm_runtime_put_autosuspend(bdi->dev);
> +
> +	return ret;
> +}
> +
> +static int bq24190_vbus_disable(struct regulator_dev *dev)
> +{
> +	struct bq24190_dev_info *bdi = rdev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = pm_runtime_get_sync(bdi->dev);
> +	if (ret < 0) {
> +		dev_warn(bdi->dev, "pm_runtime_get failed: %i\n", ret);
> +		pm_runtime_put_noidle(bdi->dev);
> +		return ret;
> +	}
> +
> +	ret = bq24190_write_mask(bdi, BQ24190_REG_POC,
> +				 BQ24190_REG_POC_CHG_CONFIG_MASK,
> +				 BQ24190_REG_POC_CHG_CONFIG_SHIFT,
> +				 BQ24190_REG_POC_CHG_CONFIG_CHARGE);
> +
> +	pm_runtime_mark_last_busy(bdi->dev);
> +	pm_runtime_put_autosuspend(bdi->dev);
> +
> +	return ret;
> +}

Let's reduce code duplication:

static int bq24190_vbus_set(dev, val) {
    ...
}

static int bq24190_vbus_enable(dev) {
    return bq24190_vbus_set(dev, BQ24190_REG_POC_CHG_CONFIG_OTG);
}

static int bq24190_vbus_disable(dev) {
    return bq24190_vbus_set(dev, BQ24190_REG_POC_CHG_CONFIG_CHARGE);
}

> +static int bq24190_vbus_is_enabled(struct regulator_dev *dev)
> +{
> +	struct bq24190_dev_info *bdi = rdev_get_drvdata(dev);
> +	int ret;
> +	u8 val;
> +
> +	ret = pm_runtime_get_sync(bdi->dev);
> +	if (ret < 0) {
> +		dev_warn(bdi->dev, "pm_runtime_get failed: %i\n", ret);
> +		pm_runtime_put_noidle(bdi->dev);
> +		return ret;
> +	}
> +
> +	ret = bq24190_read_mask(bdi, BQ24190_REG_POC,
> +				BQ24190_REG_POC_CHG_CONFIG_MASK,
> +				BQ24190_REG_POC_CHG_CONFIG_SHIFT, &val);
> +
> +	pm_runtime_mark_last_busy(bdi->dev);
> +	pm_runtime_put_autosuspend(bdi->dev);
> +
> +	return ret ? ret : val == BQ24190_REG_POC_CHG_CONFIG_OTG;
> +}
> +
> +static const struct regulator_ops bq24190_vbus_ops = {
> +	.enable = bq24190_vbus_enable,
> +	.disable = bq24190_vbus_disable,
> +	.is_enabled = bq24190_vbus_is_enabled,
> +};
> +
> +static const struct regulator_desc bq24190_vbus_desc = {
> +	.name = "usb_otg_vbus",
> +	.type = REGULATOR_VOLTAGE,
> +	.owner = THIS_MODULE,
> +	.ops = &bq24190_vbus_ops,
> +	.fixed_uV = 5000000,
> +	.n_voltages = 1,
> +};
> +
> +static const struct regulator_init_data bq24190_vbus_init_data = {
> +	.constraints = {
> +		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
> +	},
> +};
> +
> +static int bq24190_register_vbus_regulator(struct bq24190_dev_info *bdi)
> +{
> +	struct bq24190_platform_data *pdata = bdi->dev->platform_data;
> +	struct regulator_config cfg = { };
> +	struct regulator_dev *reg;
> +	int ret = 0;
> +
> +	cfg.dev = bdi->dev;
> +	if (pdata && pdata->regulator_init_data)
> +		cfg.init_data = pdata->regulator_init_data;
> +	else
> +		cfg.init_data = &bq24190_vbus_init_data;
> +	cfg.driver_data = bdi;
> +	reg = devm_regulator_register(bdi->dev, &bq24190_vbus_desc, &cfg);
> +	if (IS_ERR(reg)) {
> +		ret = PTR_ERR(reg);
> +		dev_err(bdi->dev, "Can't register regulator: %d\n", ret);
> +	}
> +
> +	return ret;
> +}
> +#else
> +static int bq24190_register_vbus_regulator(struct bq24190_dev_info *bdi)
> +{
> +	return 0;
> +}
> +#endif
> +
>  /*
>   * According to the "Host Mode and default Mode" section of the
>   * manual, a write to any register causes the bq24190 to switch
> @@ -1577,6 +1699,10 @@ static int bq24190_probe(struct i2c_client *client,
>  		goto out_sysfs;
>  	}
>  
> +	ret = bq24190_register_vbus_regulator(bdi);
> +	if (ret < 0)
> +		goto out_sysfs;
> +
>  	if (bdi->extcon) {
>  		INIT_DELAYED_WORK(&bdi->extcon_work, bq24190_extcon_work);
>  		bdi->extcon_nb.notifier_call = bq24190_extcon_event;
> diff --git a/include/linux/power/bq24190_charger.h b/include/linux/power/bq24190_charger.h
> new file mode 100644
> index 0000000..45ce7f1
> --- /dev/null
> +++ b/include/linux/power/bq24190_charger.h
> @@ -0,0 +1,18 @@
> +/*
> + * Platform data for the TI bq24190 battery charger driver.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef _BQ24190_CHARGER_H_
> +#define _BQ24190_CHARGER_H_
> +
> +#include <linux/regulator/machine.h>
> +
> +struct bq24190_platform_data {
> +	const struct regulator_init_data *regulator_init_data;
> +};
> +
> +#endif
> -- 
> 2.9.4
> 

Otherwise looks fine to me.

-- Sebastian

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