Commit c6f4a42d authored by Minkyu Kang's avatar Minkyu Kang Committed by Anton Vorontsov
Browse files

Add MAX17040 Fuel Gauge driver 



The MAX17040 is a I2C interfaced Fuel Gauge systems for lithium-ion
batteries This patch adds support the MAX17040 Fuel Gauge

Signed-off-by: default avatarMinkyu Kang <mk7.kang@samsung.com>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent cef437e3

drivers/power/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -82,6 +82,14 @@ config BATTERY_DA9030 
	  Say Y here to enable support for batteries charger integrated into

	  DA9030 PMIC.



config BATTERY_MAX17040

	tristate "Maxim MAX17040 Fuel Gauge"

	depends on I2C

	help

	  MAX17040 is fuel-gauge systems for lithium-ion (Li+) batteries

	  in handheld and portable equipment. The MAX17040 is configured

	  to operate with a single lithium cell



config CHARGER_PCF50633

	tristate "NXP PCF50633 MBC"

	depends on MFD_PCF50633

drivers/power/Makefile

+2 −1
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@@ -25,4 +25,5 @@ obj-$(CONFIG_BATTERY_TOSA) += tosa_battery.o 
obj-$(CONFIG_BATTERY_WM97XX)	+= wm97xx_battery.o

obj-$(CONFIG_BATTERY_BQ27x00)	+= bq27x00_battery.o

obj-$(CONFIG_BATTERY_DA9030)	+= da9030_battery.o

obj-$(CONFIG_BATTERY_MAX17040)	+= max17040_battery.o

obj-$(CONFIG_CHARGER_PCF50633)	+= pcf50633-charger.o

drivers/power/max17040_battery.c

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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>



#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");

		i2c_set_clientdata(client, NULL);

		kfree(chip);

		return ret;

	}



	max17040_reset(client);

	max17040_get_version(client);



	INIT_DELAYED_WORK_DEFERRABLE(&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);

	i2c_set_clientdata(client, NULL);

	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,

};



static int __init max17040_init(void)

{

	return i2c_add_driver(&max17040_i2c_driver);

}

module_init(max17040_init);



static void __exit max17040_exit(void)

{

	i2c_del_driver(&max17040_i2c_driver);

}

module_exit(max17040_exit);



MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");

MODULE_DESCRIPTION("MAX17040 Fuel Gauge");

MODULE_LICENSE("GPL");

include/linux/max17040_battery.h

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/*

 *  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.

 */



#ifndef __MAX17040_BATTERY_H_

#define __MAX17040_BATTERY_H_



struct max17040_platform_data {

	int (*battery_online)(void);

	int (*charger_online)(void);

	int (*charger_enable)(void);

};



#endif

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