drivers/power/rt5033_battery.c

   1 /*
   2  * Fuel gauge driver for Richtek RT5033
   3  *
   4  * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
   5  * Author: Beomho Seo <beomho.seo@samsung.com>
   6  *
   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.
  10  */
  11
  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>
  17
  18 static int rt5033_battery_get_capacity(struct i2c_client *client)
  19 {
  20         struct rt5033_battery *battery = i2c_get_clientdata(client);
  21         u32 msb;
  22
  23         regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
  24
  25         return msb;
  26 }
  27
  28 static int rt5033_battery_get_present(struct i2c_client *client)
  29 {
  30         struct rt5033_battery *battery = i2c_get_clientdata(client);
  31         u32 val;
  32
  33         regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
  34
  35         return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
  36 }
  37
  38 static int rt5033_battery_get_watt_prop(struct i2c_client *client,
  39                 enum power_supply_property psp)
  40 {
  41         struct rt5033_battery *battery = i2c_get_clientdata(client);
  42         unsigned int regh, regl;
  43         int ret;
  44         u32 msb, lsb;
  45
  46         switch (psp) {
  47         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  48                 regh = RT5033_FUEL_REG_VBAT_H;
  49                 regl = RT5033_FUEL_REG_VBAT_L;
  50                 break;
  51         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
  52                 regh = RT5033_FUEL_REG_AVG_VOLT_H;
  53                 regl = RT5033_FUEL_REG_AVG_VOLT_L;
  54                 break;
  55         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
  56                 regh = RT5033_FUEL_REG_OCV_H;
  57                 regl = RT5033_FUEL_REG_OCV_L;
  58                 break;
  59         default:
  60                 return -EINVAL;
  61         }
  62
  63         regmap_read(battery->regmap, regh, &msb);
  64         regmap_read(battery->regmap, regl, &lsb);
  65
  66         ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;
  67
  68         return ret;
  69 }
  70
  71 static int rt5033_battery_get_property(struct power_supply *psy,
  72                 enum power_supply_property psp,
  73                 union power_supply_propval *val)
  74 {
  75         struct rt5033_battery *battery = container_of(psy,
  76                                 struct rt5033_battery, psy);
  77
  78         switch (psp) {
  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,
  83                                                                         psp);
  84                 break;
  85         case POWER_SUPPLY_PROP_PRESENT:
  86                 val->intval = rt5033_battery_get_present(battery->client);
  87                 break;
  88         case POWER_SUPPLY_PROP_CAPACITY:
  89                 val->intval = rt5033_battery_get_capacity(battery->client);
  90                 break;
  91         default:
  92                 return -EINVAL;
  93         }
  94         return 0;
  95 }
  96
  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,
 103 };
 104
 105 static struct regmap_config rt5033_battery_regmap_config = {
 106         .reg_bits       = 8,
 107         .val_bits       = 8,
 108         .max_register   = RT5033_FUEL_REG_END,
 109 };
 110
 111 static int rt5033_battery_probe(struct i2c_client *client,
 112                 const struct i2c_device_id *id)
 113 {
 114         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 115         struct rt5033_battery *battery;
 116         u32 ret;
 117
 118         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
 119                 return -EIO;
 120
 121         battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
 122         if (!battery)
 123                 return -EINVAL;
 124
 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");
 130                 return -EINVAL;
 131         }
 132
 133         i2c_set_clientdata(client, battery);
 134
 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);
 140
 141         ret = power_supply_register(&client->dev, &battery->psy);
 142         if (ret) {
 143                 dev_err(&client->dev, "Failed to register power supply\n");
 144                 return ret;
 145         }
 146
 147         return 0;
 148 }
 149
 150 static int rt5033_battery_remove(struct i2c_client *client)
 151 {
 152         struct rt5033_battery *battery = i2c_get_clientdata(client);
 153
 154         power_supply_unregister(&battery->psy);
 155
 156         return 0;
 157 }
 158
 159 static const struct i2c_device_id rt5033_battery_id[] = {
 160         { "rt5033-battery", },
 161         { }
 162 };
 163 MODULE_DEVICE_TABLE(platform, rt5033_battery_id);
 164
 165 static struct i2c_driver rt5033_battery_driver = {
 166         .driver = {
 167                 .name = "rt5033-battery",
 168         },
 169         .probe = rt5033_battery_probe,
 170         .remove = rt5033_battery_remove,
 171         .id_table = rt5033_battery_id,
 172 };
 173 module_i2c_driver(rt5033_battery_driver);
 174
 175 MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
 176 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 177 MODULE_LICENSE("GPL");