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/*
* Fuel gauge driver for Maxim MAX77843
*
* Copyright (C) 2015 Samsung Electronics, Co., Ltd.
* Author: Beomho Seo <beomho.seo@samsung.com>
* Krzysztof Kozlowski <k.kozlowski@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published bythe Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max77843-private.h>
struct max77843_battery {
struct device *dev;
struct max77843 *max77843;
struct i2c_client *client;
struct regmap *regmap;
struct power_supply *psy;
};
static int max77843_battery_get_capacity(struct max77843_battery *battery)
{
struct regmap *regmap = battery->regmap;
int ret, val;
unsigned int reg_data;
ret = regmap_read(regmap, MAX77843_FG_REG_SOCREP, ®_data);
if (ret) {
dev_err(battery->dev, "Failed to read fuelgauge register\n");
return ret;
}
val = reg_data >> 8;
return val;
}
static int max77843_battery_get_energy_prop(struct max77843_battery *battery,
enum power_supply_property psp)
{
struct regmap *regmap = battery->regmap;
unsigned int reg;
int ret, val;
unsigned int reg_data;
switch (psp) {
case POWER_SUPPLY_PROP_ENERGY_FULL:
reg = MAX77843_FG_REG_FULLCAP;
break;
case POWER_SUPPLY_PROP_ENERGY_NOW:
reg = MAX77843_FG_REG_REMCAP_REP;
break;
case POWER_SUPPLY_PROP_ENERGY_AVG:
reg = MAX77843_FG_REG_REMCAP_AV;
break;
default:
return -EINVAL;
}
ret = regmap_read(regmap, reg, ®_data);
if (ret) {
dev_err(battery->dev, "Failed to read fuelgauge register\n");
return ret;
}
val = reg_data;
return val;
}
static int max77843_battery_get_current_prop(struct max77843_battery *battery,
enum power_supply_property psp)
{
struct regmap *regmap = battery->regmap;
unsigned int reg;
int ret, val;
unsigned int reg_data;
switch (psp) {
case POWER_SUPPLY_PROP_CURRENT_NOW:
reg = MAX77843_FG_REG_CURRENT;
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
reg = MAX77843_FG_REG_AVG_CURRENT;
break;
default:
return -EINVAL;
}
ret = regmap_read(regmap, reg, ®_data);
if (ret) {
dev_err(battery->dev, "Failed to read fuelgauge register\n");
return ret;
}
val = reg_data;
if (val & 0x8000) {
/* Negative */
val = ~val & 0xffff;
val++;
val *= -1;
}
/* Unit of current is mA */
val = val * 15625 / 100000;
return val;
}
static int max77843_battery_get_voltage_prop(struct max77843_battery *battery,
enum power_supply_property psp)
{
struct regmap *regmap = battery->regmap;
unsigned int reg;
int ret, val;
unsigned int reg_data;
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
reg = MAX77843_FG_REG_VCELL;
break;
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
reg = MAX77843_FG_REG_AVG_VCELL;
break;
case POWER_SUPPLY_PROP_VOLTAGE_OCV:
reg = MAX77843_FG_REG_OCV;
break;
default:
return -EINVAL;
}
ret = regmap_read(regmap, reg, ®_data);
if (ret) {
dev_err(battery->dev, "Failed to read fuelgauge register\n");
return ret;
}
val = (reg_data >> 4) * 125;
val /= 100;
return val;
}
static const char *model_name = "MAX77843";
static const char *manufacturer = "Maxim Integrated";
static int max77843_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max77843_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 = max77843_battery_get_voltage_prop(battery, psp);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
case POWER_SUPPLY_PROP_CURRENT_AVG:
val->intval = max77843_battery_get_current_prop(battery, psp);
break;
case POWER_SUPPLY_PROP_ENERGY_FULL:
case POWER_SUPPLY_PROP_ENERGY_NOW:
case POWER_SUPPLY_PROP_ENERGY_AVG:
val->intval = max77843_battery_get_energy_prop(battery, psp);
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = max77843_battery_get_capacity(battery);
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = model_name;
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = manufacturer;
break;
default:
return -EINVAL;
}
return 0;
}
static enum power_supply_property max77843_battery_props[] = {
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_VOLTAGE_OCV,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_ENERGY_FULL,
POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_ENERGY_AVG,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static const struct regmap_config max77843_fuel_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.val_format_endian = REGMAP_ENDIAN_NATIVE,
.max_register = MAX77843_FG_END,
};
static const struct power_supply_desc max77843_battery_desc = {
.name = "max77843-fuelgauge",
.type = POWER_SUPPLY_TYPE_BATTERY,
.get_property = max77843_battery_get_property,
.properties = max77843_battery_props,
.num_properties = ARRAY_SIZE(max77843_battery_props),
};
static int max77843_battery_probe(struct platform_device *pdev)
{
struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
struct power_supply_config psy_cfg = {};
struct max77843_battery *battery;
int ret;
battery = devm_kzalloc(&pdev->dev, sizeof(*battery), GFP_KERNEL);
if (!battery)
return -ENOMEM;
battery->dev = &pdev->dev;
battery->max77843 = max77843;
psy_cfg.drv_data = battery;
battery->client = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_FG);
if (!battery->client) {
dev_err(&pdev->dev, "Failed to get dummy i2c client.\n");
return PTR_ERR(battery->client);
}
i2c_set_clientdata(battery->client, max77843);
battery->regmap = devm_regmap_init_i2c(battery->client,
&max77843_fuel_regmap_config);
if (IS_ERR(battery->regmap)) {
ret = PTR_ERR(battery->regmap);
goto err_i2c;
}
platform_set_drvdata(pdev, battery);
battery->psy = power_supply_register(&pdev->dev,
&max77843_battery_desc, &psy_cfg);
if (IS_ERR(battery->psy)) {
dev_err(&pdev->dev, "Failed to register power supply\n");
ret = PTR_ERR(battery->psy);
goto err_i2c;
}
return 0;
err_i2c:
i2c_unregister_device(battery->client);
return ret;
}
static int max77843_battery_remove(struct platform_device *pdev)
{
struct max77843_battery *battery = platform_get_drvdata(pdev);
power_supply_unregister(battery->psy);
i2c_unregister_device(battery->client);
return 0;
}
static const struct platform_device_id max77843_battery_id[] = {
{ "max77843-fuelgauge", },
{ }
};
MODULE_DEVICE_TABLE(platform, max77843_battery_id);
static struct platform_driver max77843_battery_driver = {
.driver = {
.name = "max77843-fuelgauge",
},
.probe = max77843_battery_probe,
.remove = max77843_battery_remove,
.id_table = max77843_battery_id,
};
module_platform_driver(max77843_battery_driver);
MODULE_DESCRIPTION("Maxim MAX77843 fuel gauge driver");
MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
MODULE_LICENSE("GPL");
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