Quelle  rt5033_battery.c   Sprache: C

// 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.fwnode = dev_fwnode(&client->dev);
 psy_cfg.drv_data = battery;

 battery->psy = devm_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 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,
 .id_table = rt5033_battery_id,
};
module_i2c_driver(rt5033_battery_driver);

MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
MODULE_AUTHOR("Beomho Seo ");
MODULE_LICENSE("GPL");