diff options
Diffstat (limited to 'drivers/power/supply/rt5033_battery.c')
| -rw-r--r-- | drivers/power/supply/rt5033_battery.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/power/supply/rt5033_battery.c b/drivers/power/supply/rt5033_battery.c new file mode 100644 index 0000000000..d90b96df8e --- /dev/null +++ b/drivers/power/supply/rt5033_battery.c @@ -0,0 +1,207 @@ +// 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; + } + + i2c_set_clientdata(client, battery); + psy_cfg.of_node = client->dev.of_node; + psy_cfg.drv_data = battery; + + battery->psy = 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 void rt5033_battery_remove(struct i2c_client *client) +{ + struct rt5033_battery *battery = i2c_get_clientdata(client); + + power_supply_unregister(battery->psy); +} + +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, + .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"); |