power/supply/rt5033_battery.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Fuel gauge driver for Richtek RT5033
0004  *
0005  * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
0006  * Author: Beomho Seo <beomho.seo@samsung.com>
0007  */
0008
0009 #include <linux/module.h>
0010 #include <linux/platform_device.h>
0011 #include <linux/power_supply.h>
0012 #include <linux/mfd/rt5033-private.h>
0013 #include <linux/mfd/rt5033.h>
0014
0015 static int rt5033_battery_get_capacity(struct i2c_client *client)
0016 {
0017     struct rt5033_battery *battery = i2c_get_clientdata(client);
0018     u32 msb;
0019
0020     regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
0021
0022     return msb;
0023 }
0024
0025 static int rt5033_battery_get_present(struct i2c_client *client)
0026 {
0027     struct rt5033_battery *battery = i2c_get_clientdata(client);
0028     u32 val;
0029
0030     regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
0031
0032     return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
0033 }
0034
0035 static int rt5033_battery_get_watt_prop(struct i2c_client *client,
0036         enum power_supply_property psp)
0037 {
0038     struct rt5033_battery *battery = i2c_get_clientdata(client);
0039     unsigned int regh, regl;
0040     int ret;
0041     u32 msb, lsb;
0042
0043     switch (psp) {
0044     case POWER_SUPPLY_PROP_VOLTAGE_NOW:
0045         regh = RT5033_FUEL_REG_VBAT_H;
0046         regl = RT5033_FUEL_REG_VBAT_L;
0047         break;
0048     case POWER_SUPPLY_PROP_VOLTAGE_AVG:
0049         regh = RT5033_FUEL_REG_AVG_VOLT_H;
0050         regl = RT5033_FUEL_REG_AVG_VOLT_L;
0051         break;
0052     case POWER_SUPPLY_PROP_VOLTAGE_OCV:
0053         regh = RT5033_FUEL_REG_OCV_H;
0054         regl = RT5033_FUEL_REG_OCV_L;
0055         break;
0056     default:
0057         return -EINVAL;
0058     }
0059
0060     regmap_read(battery->regmap, regh, &msb);
0061     regmap_read(battery->regmap, regl, &lsb);
0062
0063     ret = ((msb << 4) + (lsb >> 4)) * 1250;
0064
0065     return ret;
0066 }
0067
0068 static int rt5033_battery_get_property(struct power_supply *psy,
0069         enum power_supply_property psp,
0070         union power_supply_propval *val)
0071 {
0072     struct rt5033_battery *battery = power_supply_get_drvdata(psy);
0073
0074     switch (psp) {
0075     case POWER_SUPPLY_PROP_VOLTAGE_NOW:
0076     case POWER_SUPPLY_PROP_VOLTAGE_AVG:
0077     case POWER_SUPPLY_PROP_VOLTAGE_OCV:
0078         val->intval = rt5033_battery_get_watt_prop(battery->client,
0079                                     psp);
0080         break;
0081     case POWER_SUPPLY_PROP_PRESENT:
0082         val->intval = rt5033_battery_get_present(battery->client);
0083         break;
0084     case POWER_SUPPLY_PROP_CAPACITY:
0085         val->intval = rt5033_battery_get_capacity(battery->client);
0086         break;
0087     default:
0088         return -EINVAL;
0089     }
0090     return 0;
0091 }
0092
0093 static enum power_supply_property rt5033_battery_props[] = {
0094     POWER_SUPPLY_PROP_VOLTAGE_NOW,
0095     POWER_SUPPLY_PROP_VOLTAGE_AVG,
0096     POWER_SUPPLY_PROP_VOLTAGE_OCV,
0097     POWER_SUPPLY_PROP_PRESENT,
0098     POWER_SUPPLY_PROP_CAPACITY,
0099 };
0100
0101 static const struct regmap_config rt5033_battery_regmap_config = {
0102     .reg_bits   = 8,
0103     .val_bits   = 8,
0104     .max_register   = RT5033_FUEL_REG_END,
0105 };
0106
0107 static const struct power_supply_desc rt5033_battery_desc = {
0108     .name       = "rt5033-battery",
0109     .type       = POWER_SUPPLY_TYPE_BATTERY,
0110     .get_property   = rt5033_battery_get_property,
0111     .properties = rt5033_battery_props,
0112     .num_properties = ARRAY_SIZE(rt5033_battery_props),
0113 };
0114
0115 static int rt5033_battery_probe(struct i2c_client *client,
0116         const struct i2c_device_id *id)
0117 {
0118     struct i2c_adapter *adapter = client->adapter;
0119     struct power_supply_config psy_cfg = {};
0120     struct rt5033_battery *battery;
0121     u32 ret;
0122
0123     if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
0124         return -EIO;
0125
0126     battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
0127     if (!battery)
0128         return -ENOMEM;
0129
0130     battery->client = client;
0131     battery->regmap = devm_regmap_init_i2c(client,
0132             &rt5033_battery_regmap_config);
0133     if (IS_ERR(battery->regmap)) {
0134         dev_err(&client->dev, "Failed to initialize regmap\n");
0135         return -EINVAL;
0136     }
0137
0138     i2c_set_clientdata(client, battery);
0139     psy_cfg.drv_data = battery;
0140
0141     battery->psy = power_supply_register(&client->dev,
0142                          &rt5033_battery_desc, &psy_cfg);
0143     if (IS_ERR(battery->psy)) {
0144         dev_err(&client->dev, "Failed to register power supply\n");
0145         ret = PTR_ERR(battery->psy);
0146         return ret;
0147     }
0148
0149     return 0;
0150 }
0151
0152 static int rt5033_battery_remove(struct i2c_client *client)
0153 {
0154     struct rt5033_battery *battery = i2c_get_clientdata(client);
0155
0156     power_supply_unregister(battery->psy);
0157
0158     return 0;
0159 }
0160
0161 static const struct i2c_device_id rt5033_battery_id[] = {
0162     { "rt5033-battery", },
0163     { }
0164 };
0165 MODULE_DEVICE_TABLE(i2c, rt5033_battery_id);
0166
0167 static const struct of_device_id rt5033_battery_of_match[] = {
0168     { .compatible = "richtek,rt5033-battery", },
0169     { }
0170 };
0171 MODULE_DEVICE_TABLE(of, rt5033_battery_of_match);
0172
0173 static struct i2c_driver rt5033_battery_driver = {
0174     .driver = {
0175         .name = "rt5033-battery",
0176         .of_match_table = rt5033_battery_of_match,
0177     },
0178     .probe = rt5033_battery_probe,
0179     .remove = rt5033_battery_remove,
0180     .id_table = rt5033_battery_id,
0181 };
0182 module_i2c_driver(rt5033_battery_driver);
0183
0184 MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
0185 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
0186 MODULE_LICENSE("GPL");