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// SPDX-License-Identifier: GPL-2.0-only
/*
* Fuel gauge driver for Richtek RT5033
*
* Copyright (C) 2014 Samsung Electronics, Co., Ltd.
* Author: Beomho Seo <beomho.seo@samsung.com>
*/
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/mfd/rt5033-private.h>
struct rt5033_battery {
struct i2c_client *client;
struct regmap *regmap;
struct power_supply *psy;
};
static int rt5033_battery_get_status(struct i2c_client *client)
{
struct rt5033_battery *battery = i2c_get_clientdata(client);
union power_supply_propval val;
int ret;
ret = power_supply_get_property_from_supplier(battery->psy,
POWER_SUPPLY_PROP_STATUS,
&val);
if (ret)
val.intval = POWER_SUPPLY_STATUS_UNKNOWN;
return val.intval;
}
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;
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 = power_supply_get_drvdata(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;
case POWER_SUPPLY_PROP_STATUS:
val->intval = rt5033_battery_get_status(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,
POWER_SUPPLY_PROP_STATUS,
};
static const struct regmap_config rt5033_battery_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RT5033_FUEL_REG_END,
};
static const struct power_supply_desc rt5033_battery_desc = {
.name = "rt5033-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.get_property = rt5033_battery_get_property,
.properties = rt5033_battery_props,
.num_properties = ARRAY_SIZE(rt5033_battery_props),
};
static int rt5033_battery_probe(struct i2c_client *client)
{
struct i2c_adapter *adapter = client->adapter;
struct power_supply_config psy_cfg = {};
struct rt5033_battery *battery;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
return -EIO;
battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
if (!battery)
return -ENOMEM;
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;
}
psy_cfg.of_node = client->dev.of_node;
psy_cfg.drv_data = battery;
battery->psy = devm_power_supply_register(&client->dev,
&rt5033_battery_desc,
&psy_cfg);
if (IS_ERR(battery->psy))
return dev_err_probe(&client->dev, PTR_ERR(battery->psy),
"Failed to register power supply\n");
return 0;
}
static const struct i2c_device_id rt5033_battery_id[] = {
{ "rt5033-battery", },
{ }
};
MODULE_DEVICE_TABLE(i2c, rt5033_battery_id);
static const struct of_device_id rt5033_battery_of_match[] = {
{ .compatible = "richtek,rt5033-battery", },
{ }
};
MODULE_DEVICE_TABLE(of, rt5033_battery_of_match);
static struct i2c_driver rt5033_battery_driver = {
.driver = {
.name = "rt5033-battery",
.of_match_table = rt5033_battery_of_match,
},
.probe = rt5033_battery_probe,
.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");
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