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/*
* max17040_battery.c
* fuel-gauge systems for lithium-ion (Li+) batteries
*
* Copyright (C) 2009 Samsung Electronics
* Minkyu Kang <mk7.kang@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 by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/power_supply.h>
#include <linux/max17040_battery.h>
#include <linux/slab.h>
#define MAX17040_VCELL_MSB 0x02
#define MAX17040_VCELL_LSB 0x03
#define MAX17040_SOC_MSB 0x04
#define MAX17040_SOC_LSB 0x05
#define MAX17040_MODE_MSB 0x06
#define MAX17040_MODE_LSB 0x07
#define MAX17040_VER_MSB 0x08
#define MAX17040_VER_LSB 0x09
#define MAX17040_RCOMP_MSB 0x0C
#define MAX17040_RCOMP_LSB 0x0D
#define MAX17040_CMD_MSB 0xFE
#define MAX17040_CMD_LSB 0xFF
#define MAX17040_DELAY 1000
#define MAX17040_BATTERY_FULL 95
struct max17040_chip {
struct i2c_client *client;
struct delayed_work work;
struct power_supply battery;
struct max17040_platform_data *pdata;
/* State Of Connect */
int online;
/* battery voltage */
int vcell;
/* battery capacity */
int soc;
/* State Of Charge */
int status;
};
static int max17040_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max17040_chip *chip = container_of(psy,
struct max17040_chip, battery);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = chip->status;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = chip->online;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = chip->vcell;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = chip->soc;
break;
default:
return -EINVAL;
}
return 0;
}
static int max17040_write_reg(struct i2c_client *client, int reg, u8 value)
{
int ret;
ret = i2c_smbus_write_byte_data(client, reg, value);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static int max17040_read_reg(struct i2c_client *client, int reg)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static void max17040_reset(struct i2c_client *client)
{
max17040_write_reg(client, MAX17040_CMD_MSB, 0x54);
max17040_write_reg(client, MAX17040_CMD_LSB, 0x00);
}
static void max17040_get_vcell(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
u8 msb;
u8 lsb;
msb = max17040_read_reg(client, MAX17040_VCELL_MSB);
lsb = max17040_read_reg(client, MAX17040_VCELL_LSB);
chip->vcell = (msb << 4) + (lsb >> 4);
}
static void max17040_get_soc(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
u8 msb;
u8 lsb;
msb = max17040_read_reg(client, MAX17040_SOC_MSB);
lsb = max17040_read_reg(client, MAX17040_SOC_LSB);
chip->soc = msb;
}
static void max17040_get_version(struct i2c_client *client)
{
u8 msb;
u8 lsb;
msb = max17040_read_reg(client, MAX17040_VER_MSB);
lsb = max17040_read_reg(client, MAX17040_VER_LSB);
dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb);
}
static void max17040_get_online(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
if (chip->pdata->battery_online)
chip->online = chip->pdata->battery_online();
else
chip->online = 1;
}
static void max17040_get_status(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
if (!chip->pdata->charger_online || !chip->pdata->charger_enable) {
chip->status = POWER_SUPPLY_STATUS_UNKNOWN;
return;
}
if (chip->pdata->charger_online()) {
if (chip->pdata->charger_enable())
chip->status = POWER_SUPPLY_STATUS_CHARGING;
else
chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else {
chip->status = POWER_SUPPLY_STATUS_DISCHARGING;
}
if (chip->soc > MAX17040_BATTERY_FULL)
chip->status = POWER_SUPPLY_STATUS_FULL;
}
static void max17040_work(struct work_struct *work)
{
struct max17040_chip *chip;
chip = container_of(work, struct max17040_chip, work.work);
max17040_get_vcell(chip->client);
max17040_get_soc(chip->client);
max17040_get_online(chip->client);
max17040_get_status(chip->client);
schedule_delayed_work(&chip->work, MAX17040_DELAY);
}
static enum power_supply_property max17040_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CAPACITY,
};
static int __devinit max17040_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct max17040_chip *chip;
int ret;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
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 = "battery";
chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
chip->battery.get_property = max17040_get_property;
chip->battery.properties = max17040_battery_props;
chip->battery.num_properties = ARRAY_SIZE(max17040_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;
}
max17040_reset(client);
max17040_get_version(client);
INIT_DEFERRABLE_WORK(&chip->work, max17040_work);
schedule_delayed_work(&chip->work, MAX17040_DELAY);
return 0;
}
static int __devexit max17040_remove(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
power_supply_unregister(&chip->battery);
cancel_delayed_work(&chip->work);
kfree(chip);
return 0;
}
#ifdef CONFIG_PM
static int max17040_suspend(struct i2c_client *client,
pm_message_t state)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
cancel_delayed_work(&chip->work);
return 0;
}
static int max17040_resume(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
schedule_delayed_work(&chip->work, MAX17040_DELAY);
return 0;
}
#else
#define max17040_suspend NULL
#define max17040_resume NULL
#endif /* CONFIG_PM */
static const struct i2c_device_id max17040_id[] = {
{ "max17040", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max17040_id);
static struct i2c_driver max17040_i2c_driver = {
.driver = {
.name = "max17040",
},
.probe = max17040_probe,
.remove = __devexit_p(max17040_remove),
.suspend = max17040_suspend,
.resume = max17040_resume,
.id_table = max17040_id,
};
module_i2c_driver(max17040_i2c_driver);
MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
MODULE_DESCRIPTION("MAX17040 Fuel Gauge");
MODULE_LICENSE("GPL");
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