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/*
* Fuel gauge driver for Maxim 17042 / 8966 / 8997
* Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This driver is based on max17040_battery.c
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>
enum max17042_register {
MAX17042_STATUS = 0x00,
MAX17042_VALRT_Th = 0x01,
MAX17042_TALRT_Th = 0x02,
MAX17042_SALRT_Th = 0x03,
MAX17042_AtRate = 0x04,
MAX17042_RepCap = 0x05,
MAX17042_RepSOC = 0x06,
MAX17042_Age = 0x07,
MAX17042_TEMP = 0x08,
MAX17042_VCELL = 0x09,
MAX17042_Current = 0x0A,
MAX17042_AvgCurrent = 0x0B,
MAX17042_Qresidual = 0x0C,
MAX17042_SOC = 0x0D,
MAX17042_AvSOC = 0x0E,
MAX17042_RemCap = 0x0F,
MAX17402_FullCAP = 0x10,
MAX17042_TTE = 0x11,
MAX17042_V_empty = 0x12,
MAX17042_RSLOW = 0x14,
MAX17042_AvgTA = 0x16,
MAX17042_Cycles = 0x17,
MAX17042_DesignCap = 0x18,
MAX17042_AvgVCELL = 0x19,
MAX17042_MinMaxTemp = 0x1A,
MAX17042_MinMaxVolt = 0x1B,
MAX17042_MinMaxCurr = 0x1C,
MAX17042_CONFIG = 0x1D,
MAX17042_ICHGTerm = 0x1E,
MAX17042_AvCap = 0x1F,
MAX17042_ManName = 0x20,
MAX17042_DevName = 0x21,
MAX17042_DevChem = 0x22,
MAX17042_TempNom = 0x24,
MAX17042_TempCold = 0x25,
MAX17042_TempHot = 0x26,
MAX17042_AIN = 0x27,
MAX17042_LearnCFG = 0x28,
MAX17042_SHFTCFG = 0x29,
MAX17042_RelaxCFG = 0x2A,
MAX17042_MiscCFG = 0x2B,
MAX17042_TGAIN = 0x2C,
MAx17042_TOFF = 0x2D,
MAX17042_CGAIN = 0x2E,
MAX17042_COFF = 0x2F,
MAX17042_Q_empty = 0x33,
MAX17042_T_empty = 0x34,
MAX17042_RCOMP0 = 0x38,
MAX17042_TempCo = 0x39,
MAX17042_Rx = 0x3A,
MAX17042_T_empty0 = 0x3B,
MAX17042_TaskPeriod = 0x3C,
MAX17042_FSTAT = 0x3D,
MAX17042_SHDNTIMER = 0x3F,
MAX17042_VFRemCap = 0x4A,
MAX17042_QH = 0x4D,
MAX17042_QL = 0x4E,
};
struct max17042_chip {
struct i2c_client *client;
struct power_supply battery;
struct max17042_platform_data *pdata;
};
static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
{
int ret = i2c_smbus_write_word_data(client, reg, value);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static int max17042_read_reg(struct i2c_client *client, u8 reg)
{
int ret = i2c_smbus_read_word_data(client, reg);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static enum power_supply_property max17042_battery_props[] = {
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_CAPACITY,
};
static int max17042_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max17042_chip *chip = container_of(psy,
struct max17042_chip, battery);
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = max17042_read_reg(chip->client,
MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */
break;
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
val->intval = max17042_read_reg(chip->client,
MAX17042_AvgVCELL) * 83;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = max17042_read_reg(chip->client,
MAX17042_SOC) / 256;
break;
default:
return -EINVAL;
}
return 0;
}
static int __devinit max17042_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct max17042_chip *chip;
int ret;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
return -EIO;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->client = client;
chip->pdata = client->dev.platform_data;
i2c_set_clientdata(client, chip);
chip->battery.name = "max17042_battery";
chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
chip->battery.get_property = max17042_get_property;
chip->battery.properties = max17042_battery_props;
chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
ret = power_supply_register(&client->dev, &chip->battery);
if (ret) {
dev_err(&client->dev, "failed: power supply register\n");
kfree(chip);
return ret;
}
if (!chip->pdata->enable_current_sense) {
max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
}
return 0;
}
static int __devexit max17042_remove(struct i2c_client *client)
{
struct max17042_chip *chip = i2c_get_clientdata(client);
power_supply_unregister(&chip->battery);
kfree(chip);
return 0;
}
static const struct i2c_device_id max17042_id[] = {
{ "max17042", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max17042_id);
static struct i2c_driver max17042_i2c_driver = {
.driver = {
.name = "max17042",
},
.probe = max17042_probe,
.remove = __devexit_p(max17042_remove),
.id_table = max17042_id,
};
static int __init max17042_init(void)
{
return i2c_add_driver(&max17042_i2c_driver);
}
module_init(max17042_init);
static void __exit max17042_exit(void)
{
i2c_del_driver(&max17042_i2c_driver);
}
module_exit(max17042_exit);
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
MODULE_LICENSE("GPL");
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