drivers/power/supply/rt5033_battery.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Fuel gauge driver for Richtek RT5033
   4  *
   5  * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
   6  * Author: Beomho Seo <beomho.seo@samsung.com>
   7  */
   8
   9 #include <linux/i2c.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/power_supply.h>
  13 #include <linux/regmap.h>
  14 #include <linux/mfd/rt5033-private.h>
  15
  16 struct rt5033_battery {
  17         struct i2c_client       *client;
  18         struct regmap           *regmap;
  19         struct power_supply     *psy;
  20 };
  21
  22 static int rt5033_battery_get_status(struct i2c_client *client)
  23 {
  24         struct rt5033_battery *battery = i2c_get_clientdata(client);
  25         union power_supply_propval val;
  26         int ret;
  27
  28         ret = power_supply_get_property_from_supplier(battery->psy,
  29                                                 POWER_SUPPLY_PROP_STATUS,
  30                                                 &val);
  31         if (ret)
  32                 val.intval = POWER_SUPPLY_STATUS_UNKNOWN;
  33
  34         return val.intval;
  35 }
  36
  37 static int rt5033_battery_get_capacity(struct i2c_client *client)
  38 {
  39         struct rt5033_battery *battery = i2c_get_clientdata(client);
  40         u32 msb;
  41
  42         regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
  43
  44         return msb;
  45 }
  46
  47 static int rt5033_battery_get_present(struct i2c_client *client)
  48 {
  49         struct rt5033_battery *battery = i2c_get_clientdata(client);
  50         u32 val;
  51
  52         regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
  53
  54         return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
  55 }
  56
  57 static int rt5033_battery_get_watt_prop(struct i2c_client *client,
  58                 enum power_supply_property psp)
  59 {
  60         struct rt5033_battery *battery = i2c_get_clientdata(client);
  61         unsigned int regh, regl;
  62         int ret;
  63         u32 msb, lsb;
  64
  65         switch (psp) {
  66         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  67                 regh = RT5033_FUEL_REG_VBAT_H;
  68                 regl = RT5033_FUEL_REG_VBAT_L;
  69                 break;
  70         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
  71                 regh = RT5033_FUEL_REG_AVG_VOLT_H;
  72                 regl = RT5033_FUEL_REG_AVG_VOLT_L;
  73                 break;
  74         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
  75                 regh = RT5033_FUEL_REG_OCV_H;
  76                 regl = RT5033_FUEL_REG_OCV_L;
  77                 break;
  78         default:
  79                 return -EINVAL;
  80         }
  81
  82         regmap_read(battery->regmap, regh, &msb);
  83         regmap_read(battery->regmap, regl, &lsb);
  84
  85         ret = ((msb << 4) + (lsb >> 4)) * 1250;
  86
  87         return ret;
  88 }
  89
  90 static int rt5033_battery_get_property(struct power_supply *psy,
  91                 enum power_supply_property psp,
  92                 union power_supply_propval *val)
  93 {
  94         struct rt5033_battery *battery = power_supply_get_drvdata(psy);
  95
  96         switch (psp) {
  97         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  98         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
  99         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 100                 val->intval = rt5033_battery_get_watt_prop(battery->client,
 101                                                                         psp);
 102                 break;
 103         case POWER_SUPPLY_PROP_PRESENT:
 104                 val->intval = rt5033_battery_get_present(battery->client);
 105                 break;
 106         case POWER_SUPPLY_PROP_CAPACITY:
 107                 val->intval = rt5033_battery_get_capacity(battery->client);
 108                 break;
 109         case POWER_SUPPLY_PROP_STATUS:
 110                 val->intval = rt5033_battery_get_status(battery->client);
 111                 break;
 112         default:
 113                 return -EINVAL;
 114         }
 115         return 0;
 116 }
 117
 118 static enum power_supply_property rt5033_battery_props[] = {
 119         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 120         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 121         POWER_SUPPLY_PROP_VOLTAGE_OCV,
 122         POWER_SUPPLY_PROP_PRESENT,
 123         POWER_SUPPLY_PROP_CAPACITY,
 124         POWER_SUPPLY_PROP_STATUS,
 125 };
 126
 127 static const struct regmap_config rt5033_battery_regmap_config = {
 128         .reg_bits       = 8,
 129         .val_bits       = 8,
 130         .max_register   = RT5033_FUEL_REG_END,
 131 };
 132
 133 static const struct power_supply_desc rt5033_battery_desc = {
 134         .name           = "rt5033-battery",
 135         .type           = POWER_SUPPLY_TYPE_BATTERY,
 136         .get_property   = rt5033_battery_get_property,
 137         .properties     = rt5033_battery_props,
 138         .num_properties = ARRAY_SIZE(rt5033_battery_props),
 139 };
 140
 141 static int rt5033_battery_probe(struct i2c_client *client)
 142 {
 143         struct i2c_adapter *adapter = client->adapter;
 144         struct power_supply_config psy_cfg = {};
 145         struct rt5033_battery *battery;
 146
 147         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
 148                 return -EIO;
 149
 150         battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
 151         if (!battery)
 152                 return -ENOMEM;
 153
 154         battery->client = client;
 155         battery->regmap = devm_regmap_init_i2c(client,
 156                         &rt5033_battery_regmap_config);
 157         if (IS_ERR(battery->regmap)) {
 158                 dev_err(&client->dev, "Failed to initialize regmap\n");
 159                 return -EINVAL;
 160         }
 161
 162         psy_cfg.of_node = client->dev.of_node;
 163         psy_cfg.drv_data = battery;
 164
 165         battery->psy = devm_power_supply_register(&client->dev,
 166                                                   &rt5033_battery_desc,
 167                                                   &psy_cfg);
 168         if (IS_ERR(battery->psy))
 169                 return dev_err_probe(&client->dev, PTR_ERR(battery->psy),
 170                                      "Failed to register power supply\n");
 171
 172         return 0;
 173 }
 174
 175 static const struct i2c_device_id rt5033_battery_id[] = {
 176         { "rt5033-battery", },
 177         { }
 178 };
 179 MODULE_DEVICE_TABLE(i2c, rt5033_battery_id);
 180
 181 static const struct of_device_id rt5033_battery_of_match[] = {
 182         { .compatible = "richtek,rt5033-battery", },
 183         { }
 184 };
 185 MODULE_DEVICE_TABLE(of, rt5033_battery_of_match);
 186
 187 static struct i2c_driver rt5033_battery_driver = {
 188         .driver = {
 189                 .name = "rt5033-battery",
 190                 .of_match_table = rt5033_battery_of_match,
 191         },
 192         .probe = rt5033_battery_probe,
 193         .id_table = rt5033_battery_id,
 194 };
 195 module_i2c_driver(rt5033_battery_driver);
 196
 197 MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
 198 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 199 MODULE_LICENSE("GPL");