298 lines
6.8 KiB
C
298 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// max17040_battery.c
|
|
// fuel-gauge systems for lithium-ion (Li+) batteries
|
|
//
|
|
// Copyright (C) 2009 Samsung Electronics
|
|
// Minkyu Kang <mk7.kang@samsung.com>
|
|
|
|
#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 0x02
|
|
#define MAX17040_SOC 0x04
|
|
#define MAX17040_MODE 0x06
|
|
#define MAX17040_VER 0x08
|
|
#define MAX17040_RCOMP 0x0C
|
|
#define MAX17040_CMD 0xFE
|
|
|
|
|
|
#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 = power_supply_get_drvdata(psy);
|
|
|
|
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, u16 value)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_smbus_write_word_swapped(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_word_swapped(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, 0x0054);
|
|
}
|
|
|
|
static void max17040_get_vcell(struct i2c_client *client)
|
|
{
|
|
struct max17040_chip *chip = i2c_get_clientdata(client);
|
|
u16 vcell;
|
|
|
|
vcell = max17040_read_reg(client, MAX17040_VCELL);
|
|
|
|
chip->vcell = vcell;
|
|
}
|
|
|
|
static void max17040_get_soc(struct i2c_client *client)
|
|
{
|
|
struct max17040_chip *chip = i2c_get_clientdata(client);
|
|
u16 soc;
|
|
|
|
soc = max17040_read_reg(client, MAX17040_SOC);
|
|
|
|
chip->soc = (soc >> 8);
|
|
}
|
|
|
|
static void max17040_get_version(struct i2c_client *client)
|
|
{
|
|
u16 version;
|
|
|
|
version = max17040_read_reg(client, MAX17040_VER);
|
|
|
|
dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver 0x%x\n", version);
|
|
}
|
|
|
|
static void max17040_get_online(struct i2c_client *client)
|
|
{
|
|
struct max17040_chip *chip = i2c_get_clientdata(client);
|
|
|
|
if (chip->pdata && 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 || !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);
|
|
|
|
queue_delayed_work(system_power_efficient_wq, &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 const struct power_supply_desc max17040_battery_desc = {
|
|
.name = "battery",
|
|
.type = POWER_SUPPLY_TYPE_BATTERY,
|
|
.get_property = max17040_get_property,
|
|
.properties = max17040_battery_props,
|
|
.num_properties = ARRAY_SIZE(max17040_battery_props),
|
|
};
|
|
|
|
static int max17040_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
struct power_supply_config psy_cfg = {};
|
|
struct max17040_chip *chip;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
|
|
return -EIO;
|
|
|
|
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
chip->client = client;
|
|
chip->pdata = client->dev.platform_data;
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
psy_cfg.drv_data = chip;
|
|
|
|
chip->battery = power_supply_register(&client->dev,
|
|
&max17040_battery_desc, &psy_cfg);
|
|
if (IS_ERR(chip->battery)) {
|
|
dev_err(&client->dev, "failed: power supply register\n");
|
|
return PTR_ERR(chip->battery);
|
|
}
|
|
|
|
max17040_reset(client);
|
|
max17040_get_version(client);
|
|
|
|
INIT_DEFERRABLE_WORK(&chip->work, max17040_work);
|
|
queue_delayed_work(system_power_efficient_wq, &chip->work,
|
|
MAX17040_DELAY);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max17040_remove(struct i2c_client *client)
|
|
{
|
|
struct max17040_chip *chip = i2c_get_clientdata(client);
|
|
|
|
power_supply_unregister(chip->battery);
|
|
cancel_delayed_work(&chip->work);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static int max17040_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct max17040_chip *chip = i2c_get_clientdata(client);
|
|
|
|
cancel_delayed_work(&chip->work);
|
|
return 0;
|
|
}
|
|
|
|
static int max17040_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct max17040_chip *chip = i2c_get_clientdata(client);
|
|
|
|
queue_delayed_work(system_power_efficient_wq, &chip->work,
|
|
MAX17040_DELAY);
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(max17040_pm_ops, max17040_suspend, max17040_resume);
|
|
#define MAX17040_PM_OPS (&max17040_pm_ops)
|
|
|
|
#else
|
|
|
|
#define MAX17040_PM_OPS NULL
|
|
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static const struct i2c_device_id max17040_id[] = {
|
|
{ "max17040" },
|
|
{ "max77836-battery" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max17040_id);
|
|
|
|
static const struct of_device_id max17040_of_match[] = {
|
|
{ .compatible = "maxim,max17040" },
|
|
{ .compatible = "maxim,max77836-battery" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, max17040_of_match);
|
|
|
|
static struct i2c_driver max17040_i2c_driver = {
|
|
.driver = {
|
|
.name = "max17040",
|
|
.of_match_table = max17040_of_match,
|
|
.pm = MAX17040_PM_OPS,
|
|
},
|
|
.probe = max17040_probe,
|
|
.remove = max17040_remove,
|
|
.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");
|