2 * Fuel gauge driver for Richtek RT5033
4 * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
5 * Author: Beomho Seo <beomho.seo@samsung.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published bythe Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/power_supply.h>
15 #include <linux/mfd/rt5033-private.h>
16 #include <linux/mfd/rt5033.h>
18 static int rt5033_battery_get_capacity(struct i2c_client *client)
20 struct rt5033_battery *battery = i2c_get_clientdata(client);
23 regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
28 static int rt5033_battery_get_present(struct i2c_client *client)
30 struct rt5033_battery *battery = i2c_get_clientdata(client);
33 regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
35 return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
38 static int rt5033_battery_get_watt_prop(struct i2c_client *client,
39 enum power_supply_property psp)
41 struct rt5033_battery *battery = i2c_get_clientdata(client);
42 unsigned int regh, regl;
47 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
48 regh = RT5033_FUEL_REG_VBAT_H;
49 regl = RT5033_FUEL_REG_VBAT_L;
51 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
52 regh = RT5033_FUEL_REG_AVG_VOLT_H;
53 regl = RT5033_FUEL_REG_AVG_VOLT_L;
55 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
56 regh = RT5033_FUEL_REG_OCV_H;
57 regl = RT5033_FUEL_REG_OCV_L;
63 regmap_read(battery->regmap, regh, &msb);
64 regmap_read(battery->regmap, regl, &lsb);
66 ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;
71 static int rt5033_battery_get_property(struct power_supply *psy,
72 enum power_supply_property psp,
73 union power_supply_propval *val)
75 struct rt5033_battery *battery = container_of(psy,
76 struct rt5033_battery, psy);
79 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
80 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
81 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
82 val->intval = rt5033_battery_get_watt_prop(battery->client,
85 case POWER_SUPPLY_PROP_PRESENT:
86 val->intval = rt5033_battery_get_present(battery->client);
88 case POWER_SUPPLY_PROP_CAPACITY:
89 val->intval = rt5033_battery_get_capacity(battery->client);
97 static enum power_supply_property rt5033_battery_props[] = {
98 POWER_SUPPLY_PROP_VOLTAGE_NOW,
99 POWER_SUPPLY_PROP_VOLTAGE_AVG,
100 POWER_SUPPLY_PROP_VOLTAGE_OCV,
101 POWER_SUPPLY_PROP_PRESENT,
102 POWER_SUPPLY_PROP_CAPACITY,
105 static struct regmap_config rt5033_battery_regmap_config = {
108 .max_register = RT5033_FUEL_REG_END,
111 static int rt5033_battery_probe(struct i2c_client *client,
112 const struct i2c_device_id *id)
114 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
115 struct rt5033_battery *battery;
118 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
121 battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
125 battery->client = client;
126 battery->regmap = devm_regmap_init_i2c(client,
127 &rt5033_battery_regmap_config);
128 if (IS_ERR(battery->regmap)) {
129 dev_err(&client->dev, "Failed to initialize regmap\n");
133 i2c_set_clientdata(client, battery);
135 battery->psy.name = "rt5033-battery";
136 battery->psy.type = POWER_SUPPLY_TYPE_BATTERY;
137 battery->psy.get_property = rt5033_battery_get_property;
138 battery->psy.properties = rt5033_battery_props;
139 battery->psy.num_properties = ARRAY_SIZE(rt5033_battery_props);
141 ret = power_supply_register(&client->dev, &battery->psy);
143 dev_err(&client->dev, "Failed to register power supply\n");
150 static int rt5033_battery_remove(struct i2c_client *client)
152 struct rt5033_battery *battery = i2c_get_clientdata(client);
154 power_supply_unregister(&battery->psy);
159 static const struct i2c_device_id rt5033_battery_id[] = {
160 { "rt5033-battery", },
163 MODULE_DEVICE_TABLE(platform, rt5033_battery_id);
165 static struct i2c_driver rt5033_battery_driver = {
167 .name = "rt5033-battery",
169 .probe = rt5033_battery_probe,
170 .remove = rt5033_battery_remove,
171 .id_table = rt5033_battery_id,
173 module_i2c_driver(rt5033_battery_driver);
175 MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
176 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
177 MODULE_LICENSE("GPL");