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Commit b847dd96 authored by Beomho Seo's avatar Beomho Seo Committed by Sebastian Reichel
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power: rt5033_battery: Add RT5033 Fuel gauge device driver 



This patch adds device driver of Richtek PMIC.
The driver support battery fuel gauge. Fuel gauge calculates and determines the
battery state of charge (SOC) according to battery open circuit voltage (OCV).
Also, this driver provides battery average voltage, voltage and battery present
property.

Cc: Sebastian Reichel <sre@kernel.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: default avatarBeomho Seo <beomho.seo@samsung.com>
Acked-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarSebastian Reichel <sre@kernel.org>
parent 0f2ecb8f

drivers/power/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -397,6 +397,14 @@ config BATTERY_GOLDFISH 
	  Say Y to enable support for the battery and AC power in the

	  Goldfish emulator.



config BATTERY_RT5033

	tristate "RT5033 fuel gauge support"

	depends on MFD_RT5033

	help

	  This adds support for battery fuel gauge in Richtek RT5033 PMIC.

	  The fuelgauge calculates and determines the battery state of charge

	  according to battery open circuit voltage.



source "drivers/power/reset/Kconfig"



endif # POWER_SUPPLY

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ obj-$(CONFIG_BATTERY_DA9052) += da9052-battery.o 
obj-$(CONFIG_BATTERY_MAX17040)	+= max17040_battery.o

obj-$(CONFIG_BATTERY_MAX17042)	+= max17042_battery.o

obj-$(CONFIG_BATTERY_Z2)	+= z2_battery.o

obj-$(CONFIG_BATTERY_RT5033)	+= rt5033_battery.o

obj-$(CONFIG_BATTERY_S3C_ADC)	+= s3c_adc_battery.o

obj-$(CONFIG_BATTERY_TWL4030_MADC)	+= twl4030_madc_battery.o

obj-$(CONFIG_CHARGER_88PM860X)	+= 88pm860x_charger.o

drivers/power/rt5033_battery.c

0 → 100644
+177 −0
Original line number Diff line number Diff line 
/*

 * Fuel gauge driver for Richtek RT5033

 *

 * Copyright (C) 2014 Samsung Electronics, Co., Ltd.

 * Author: Beomho Seo <beomho.seo@samsung.com>

 *

 * 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 bythe Free Software Foundation.

 */



#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/power_supply.h>

#include <linux/mfd/rt5033-private.h>

#include <linux/mfd/rt5033.h>



static int rt5033_battery_get_capacity(struct i2c_client *client)

{

	struct rt5033_battery *battery = i2c_get_clientdata(client);

	u32 msb;



	regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);



	return msb;

}



static int rt5033_battery_get_present(struct i2c_client *client)

{

	struct rt5033_battery *battery = i2c_get_clientdata(client);

	u32 val;



	regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);



	return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;

}



static int rt5033_battery_get_watt_prop(struct i2c_client *client,

		enum power_supply_property psp)

{

	struct rt5033_battery *battery = i2c_get_clientdata(client);

	unsigned int regh, regl;

	int ret;

	u32 msb, lsb;



	switch (psp) {

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

		regh = RT5033_FUEL_REG_VBAT_H;

		regl = RT5033_FUEL_REG_VBAT_L;

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_AVG:

		regh = RT5033_FUEL_REG_AVG_VOLT_H;

		regl = RT5033_FUEL_REG_AVG_VOLT_L;

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_OCV:

		regh = RT5033_FUEL_REG_OCV_H;

		regl = RT5033_FUEL_REG_OCV_L;

		break;

	default:

		return -EINVAL;

	}



	regmap_read(battery->regmap, regh, &msb);

	regmap_read(battery->regmap, regl, &lsb);



	ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;



	return ret;

}



static int rt5033_battery_get_property(struct power_supply *psy,

		enum power_supply_property psp,

		union power_supply_propval *val)

{

	struct rt5033_battery *battery = container_of(psy,

				struct rt5033_battery, psy);



	switch (psp) {

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

	case POWER_SUPPLY_PROP_VOLTAGE_AVG:

	case POWER_SUPPLY_PROP_VOLTAGE_OCV:

		val->intval = rt5033_battery_get_watt_prop(battery->client,

									psp);

		break;

	case POWER_SUPPLY_PROP_PRESENT:

		val->intval = rt5033_battery_get_present(battery->client);

		break;

	case POWER_SUPPLY_PROP_CAPACITY:

		val->intval = rt5033_battery_get_capacity(battery->client);

		break;

	default:

		return -EINVAL;

	}

	return 0;

}



static enum power_supply_property rt5033_battery_props[] = {

	POWER_SUPPLY_PROP_VOLTAGE_NOW,

	POWER_SUPPLY_PROP_VOLTAGE_AVG,

	POWER_SUPPLY_PROP_VOLTAGE_OCV,

	POWER_SUPPLY_PROP_PRESENT,

	POWER_SUPPLY_PROP_CAPACITY,

};



static struct regmap_config rt5033_battery_regmap_config = {

	.reg_bits	= 8,

	.val_bits	= 8,

	.max_register	= RT5033_FUEL_REG_END,

};



static int rt5033_battery_probe(struct i2c_client *client,

		const struct i2c_device_id *id)

{

	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);

	struct rt5033_battery *battery;

	u32 ret;



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))

		return -EIO;



	battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);

	if (!battery)

		return -EINVAL;



	battery->client = client;

	battery->regmap = devm_regmap_init_i2c(client,

			&rt5033_battery_regmap_config);

	if (IS_ERR(battery->regmap)) {

		dev_err(&client->dev, "Failed to initialize regmap\n");

		return -EINVAL;

	}



	i2c_set_clientdata(client, battery);



	battery->psy.name		= "rt5033-battery";

	battery->psy.type		= POWER_SUPPLY_TYPE_BATTERY;

	battery->psy.get_property	= rt5033_battery_get_property;

	battery->psy.properties		= rt5033_battery_props;

	battery->psy.num_properties	= ARRAY_SIZE(rt5033_battery_props);



	ret = power_supply_register(&client->dev, &battery->psy);

	if (ret) {

		dev_err(&client->dev, "Failed to register power supply\n");

		return ret;

	}



	return 0;

}



static int rt5033_battery_remove(struct i2c_client *client)

{

	struct rt5033_battery *battery = i2c_get_clientdata(client);



	power_supply_unregister(&battery->psy);



	return 0;

}



static const struct i2c_device_id rt5033_battery_id[] = {

	{ "rt5033-battery", },

	{ }

};

MODULE_DEVICE_TABLE(platform, rt5033_battery_id);



static struct i2c_driver rt5033_battery_driver = {

	.driver = {

		.name = "rt5033-battery",

	},

	.probe = rt5033_battery_probe,

	.remove = rt5033_battery_remove,

	.id_table = rt5033_battery_id,

};

module_i2c_driver(rt5033_battery_driver);



MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");

MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");

MODULE_LICENSE("GPL");