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The MAX17040 is a I2C interfaced Fuel Gauge systems for lithium-ion batteries This patch adds support the MAX17040 Fuel Gauge Signed-off-by: Minkyu Kang <mk7.kang@samsung.com> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
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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. | ||
*/ | ||
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#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> | ||
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#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 | ||
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#define MAX17040_DELAY 1000 | ||
#define MAX17040_BATTERY_FULL 95 | ||
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struct max17040_chip { | ||
struct i2c_client *client; | ||
struct delayed_work work; | ||
struct power_supply battery; | ||
struct max17040_platform_data *pdata; | ||
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/* State Of Connect */ | ||
int online; | ||
/* battery voltage */ | ||
int vcell; | ||
/* battery capacity */ | ||
int soc; | ||
/* State Of Charge */ | ||
int status; | ||
}; | ||
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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); | ||
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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; | ||
} | ||
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static int max17040_write_reg(struct i2c_client *client, int reg, u8 value) | ||
{ | ||
int ret; | ||
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ret = i2c_smbus_write_byte_data(client, reg, value); | ||
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if (ret < 0) | ||
dev_err(&client->dev, "%s: err %d\n", __func__, ret); | ||
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return ret; | ||
} | ||
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static int max17040_read_reg(struct i2c_client *client, int reg) | ||
{ | ||
int ret; | ||
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ret = i2c_smbus_read_byte_data(client, reg); | ||
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if (ret < 0) | ||
dev_err(&client->dev, "%s: err %d\n", __func__, ret); | ||
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return ret; | ||
} | ||
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static void max17040_reset(struct i2c_client *client) | ||
{ | ||
max17040_write_reg(client, MAX17040_CMD_MSB, 0x54); | ||
max17040_write_reg(client, MAX17040_CMD_LSB, 0x00); | ||
} | ||
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static void max17040_get_vcell(struct i2c_client *client) | ||
{ | ||
struct max17040_chip *chip = i2c_get_clientdata(client); | ||
u8 msb; | ||
u8 lsb; | ||
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msb = max17040_read_reg(client, MAX17040_VCELL_MSB); | ||
lsb = max17040_read_reg(client, MAX17040_VCELL_LSB); | ||
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chip->vcell = (msb << 4) + (lsb >> 4); | ||
} | ||
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static void max17040_get_soc(struct i2c_client *client) | ||
{ | ||
struct max17040_chip *chip = i2c_get_clientdata(client); | ||
u8 msb; | ||
u8 lsb; | ||
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msb = max17040_read_reg(client, MAX17040_SOC_MSB); | ||
lsb = max17040_read_reg(client, MAX17040_SOC_LSB); | ||
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chip->soc = msb; | ||
} | ||
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static void max17040_get_version(struct i2c_client *client) | ||
{ | ||
u8 msb; | ||
u8 lsb; | ||
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msb = max17040_read_reg(client, MAX17040_VER_MSB); | ||
lsb = max17040_read_reg(client, MAX17040_VER_LSB); | ||
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dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb); | ||
} | ||
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static void max17040_get_online(struct i2c_client *client) | ||
{ | ||
struct max17040_chip *chip = i2c_get_clientdata(client); | ||
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if (chip->pdata->battery_online) | ||
chip->online = chip->pdata->battery_online(); | ||
else | ||
chip->online = 1; | ||
} | ||
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static void max17040_get_status(struct i2c_client *client) | ||
{ | ||
struct max17040_chip *chip = i2c_get_clientdata(client); | ||
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if (!chip->pdata->charger_online || !chip->pdata->charger_enable) { | ||
chip->status = POWER_SUPPLY_STATUS_UNKNOWN; | ||
return; | ||
} | ||
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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; | ||
} | ||
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if (chip->soc > MAX17040_BATTERY_FULL) | ||
chip->status = POWER_SUPPLY_STATUS_FULL; | ||
} | ||
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static void max17040_work(struct work_struct *work) | ||
{ | ||
struct max17040_chip *chip; | ||
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chip = container_of(work, struct max17040_chip, work.work); | ||
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max17040_get_vcell(chip->client); | ||
max17040_get_soc(chip->client); | ||
max17040_get_online(chip->client); | ||
max17040_get_status(chip->client); | ||
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schedule_delayed_work(&chip->work, MAX17040_DELAY); | ||
} | ||
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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, | ||
}; | ||
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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; | ||
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | ||
return -EIO; | ||
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chip = kzalloc(sizeof(*chip), GFP_KERNEL); | ||
if (!chip) | ||
return -ENOMEM; | ||
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chip->client = client; | ||
chip->pdata = client->dev.platform_data; | ||
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i2c_set_clientdata(client, chip); | ||
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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); | ||
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ret = power_supply_register(&client->dev, &chip->battery); | ||
if (ret) { | ||
dev_err(&client->dev, "failed: power supply register\n"); | ||
i2c_set_clientdata(client, NULL); | ||
kfree(chip); | ||
return ret; | ||
} | ||
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max17040_reset(client); | ||
max17040_get_version(client); | ||
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INIT_DELAYED_WORK_DEFERRABLE(&chip->work, max17040_work); | ||
schedule_delayed_work(&chip->work, MAX17040_DELAY); | ||
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return 0; | ||
} | ||
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static int __devexit max17040_remove(struct i2c_client *client) | ||
{ | ||
struct max17040_chip *chip = i2c_get_clientdata(client); | ||
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power_supply_unregister(&chip->battery); | ||
cancel_delayed_work(&chip->work); | ||
i2c_set_clientdata(client, NULL); | ||
kfree(chip); | ||
return 0; | ||
} | ||
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#ifdef CONFIG_PM | ||
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static int max17040_suspend(struct i2c_client *client, | ||
pm_message_t state) | ||
{ | ||
struct max17040_chip *chip = i2c_get_clientdata(client); | ||
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cancel_delayed_work(&chip->work); | ||
return 0; | ||
} | ||
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static int max17040_resume(struct i2c_client *client) | ||
{ | ||
struct max17040_chip *chip = i2c_get_clientdata(client); | ||
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schedule_delayed_work(&chip->work, MAX17040_DELAY); | ||
return 0; | ||
} | ||
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#else | ||
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#define max17040_suspend NULL | ||
#define max17040_resume NULL | ||
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#endif /* CONFIG_PM */ | ||
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static const struct i2c_device_id max17040_id[] = { | ||
{ "max17040", 0 }, | ||
{ } | ||
}; | ||
MODULE_DEVICE_TABLE(i2c, max17040_id); | ||
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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, | ||
}; | ||
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static int __init max17040_init(void) | ||
{ | ||
return i2c_add_driver(&max17040_i2c_driver); | ||
} | ||
module_init(max17040_init); | ||
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static void __exit max17040_exit(void) | ||
{ | ||
i2c_del_driver(&max17040_i2c_driver); | ||
} | ||
module_exit(max17040_exit); | ||
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MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>"); | ||
MODULE_DESCRIPTION("MAX17040 Fuel Gauge"); | ||
MODULE_LICENSE("GPL"); |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,19 @@ | ||
/* | ||
* 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. | ||
*/ | ||
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#ifndef __MAX17040_BATTERY_H_ | ||
#define __MAX17040_BATTERY_H_ | ||
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struct max17040_platform_data { | ||
int (*battery_online)(void); | ||
int (*charger_online)(void); | ||
int (*charger_enable)(void); | ||
}; | ||
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#endif |