[linux-2.6-block.git] / drivers / power / max17042_battery.c

/*
 * 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/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>

/* Status register bits */
#define STATUS_POR_BIT         (1 << 1)
#define STATUS_BST_BIT         (1 << 3)
#define STATUS_VMN_BIT         (1 << 8)
#define STATUS_TMN_BIT         (1 << 9)
#define STATUS_SMN_BIT         (1 << 10)
#define STATUS_BI_BIT          (1 << 11)
#define STATUS_VMX_BIT         (1 << 12)
#define STATUS_TMX_BIT         (1 << 13)
#define STATUS_SMX_BIT         (1 << 14)
#define STATUS_BR_BIT          (1 << 15)

#define VFSOC0_LOCK		0x0000
#define VFSOC0_UNLOCK		0x0080
#define MODEL_UNLOCK1	0X0059
#define MODEL_UNLOCK2	0X00C4
#define MODEL_LOCK1		0X0000
#define MODEL_LOCK2		0X0000

#define dQ_ACC_DIV	0x4
#define dP_ACC_100	0x1900
#define dP_ACC_200	0x3200

struct max17042_chip {
	struct i2c_client *client;
	struct power_supply battery;
	struct max17042_platform_data *pdata;
	struct work_struct work;
	int    init_complete;
};

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 void max17042_set_reg(struct i2c_client *client,
			     struct max17042_reg_data *data, int size)
{
	int i;

	for (i = 0; i < size; i++)
		max17042_write_reg(client, data[i].addr, data[i].data);
}

static enum power_supply_property max17042_battery_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
};

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);
	int ret;

	if (!chip->init_complete)
		return -EAGAIN;

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
		ret = max17042_read_reg(chip->client, MAX17042_STATUS);
		if (ret < 0)
			return ret;

		if (ret & MAX17042_STATUS_BattAbsent)
			val->intval = 0;
		else
			val->intval = 1;
		break;
	case POWER_SUPPLY_PROP_CYCLE_COUNT:
		ret = max17042_read_reg(chip->client, MAX17042_Cycles);
		if (ret < 0)
			return ret;

		val->intval = ret;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
		ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
		if (ret < 0)
			return ret;

		val->intval = ret >> 8;
		val->intval *= 20000; /* Units of LSB = 20mV */
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		ret = max17042_read_reg(chip->client, MAX17042_V_empty);
		if (ret < 0)
			return ret;

		val->intval = ret >> 7;
		val->intval *= 10000; /* Units of LSB = 10mV */
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = max17042_read_reg(chip->client, MAX17042_VCELL);
		if (ret < 0)
			return ret;

		val->intval = ret * 625 / 8;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
		if (ret < 0)
			return ret;

		val->intval = ret * 625 / 8;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		ret = max17042_read_reg(chip->client, MAX17042_SOC);
		if (ret < 0)
			return ret;

		val->intval = ret >> 8;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
		ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
		if (ret < 0)
			return ret;

		if ((ret >> 8) >= MAX17042_BATTERY_FULL)
			val->intval = 1;
		else if (ret >= 0)
			val->intval = 0;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		ret = max17042_read_reg(chip->client, MAX17042_TEMP);
		if (ret < 0)
			return ret;

		val->intval = ret;
		/* The value is signed. */
		if (val->intval & 0x8000) {
			val->intval = (0x7fff & ~val->intval) + 1;
			val->intval *= -1;
		}
		/* The value is converted into deci-centigrade scale */
		/* Units of LSB = 1 / 256 degree Celsius */
		val->intval = val->intval * 10 / 256;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		if (chip->pdata->enable_current_sense) {
			ret = max17042_read_reg(chip->client, MAX17042_Current);
			if (ret < 0)
				return ret;

			val->intval = ret;
			if (val->intval & 0x8000) {
				/* Negative */
				val->intval = ~val->intval & 0x7fff;
				val->intval++;
				val->intval *= -1;
			}
			val->intval *= 1562500 / chip->pdata->r_sns;
		} else {
			return -EINVAL;
		}
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		if (chip->pdata->enable_current_sense) {
			ret = max17042_read_reg(chip->client,
						MAX17042_AvgCurrent);
			if (ret < 0)
				return ret;

			val->intval = ret;
			if (val->intval & 0x8000) {
				/* Negative */
				val->intval = ~val->intval & 0x7fff;
				val->intval++;
				val->intval *= -1;
			}
			val->intval *= 1562500 / chip->pdata->r_sns;
		} else {
			return -EINVAL;
		}
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int max17042_write_verify_reg(struct i2c_client *client,
				u8 reg, u16 value)
{
	int retries = 8;
	int ret;
	u16 read_value;

	do {
		ret = i2c_smbus_write_word_data(client, reg, value);
		read_value =  max17042_read_reg(client, reg);
		if (read_value != value) {
			ret = -EIO;
			retries--;
		}
	} while (retries && read_value != value);

	if (ret < 0)
		dev_err(&client->dev, "%s: err %d\n", __func__, ret);

	return ret;
}

static inline void max17042_override_por(
	struct i2c_client *client, u8 reg, u16 value)
{
	if (value)
		max17042_write_reg(client, reg, value);
}

static inline void max10742_unlock_model(struct max17042_chip *chip)
{
	struct i2c_client *client = chip->client;
	max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
	max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
}

static inline void max10742_lock_model(struct max17042_chip *chip)
{
	struct i2c_client *client = chip->client;
	max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
	max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
}

static inline void max17042_write_model_data(struct max17042_chip *chip,
					u8 addr, int size)
{
	struct i2c_client *client = chip->client;
	int i;
	for (i = 0; i < size; i++)
		max17042_write_reg(client, addr + i,
				chip->pdata->config_data->cell_char_tbl[i]);
}

static inline void max17042_read_model_data(struct max17042_chip *chip,
					u8 addr, u16 *data, int size)
{
	struct i2c_client *client = chip->client;
	int i;

	for (i = 0; i < size; i++)
		data[i] = max17042_read_reg(client, addr + i);
}

static inline int max17042_model_data_compare(struct max17042_chip *chip,
					u16 *data1, u16 *data2, int size)
{
	int i;

	if (memcmp(data1, data2, size)) {
		dev_err(&chip->client->dev, "%s compare failed\n", __func__);
		for (i = 0; i < size; i++)
			dev_info(&chip->client->dev, "0x%x, 0x%x",
				data1[i], data2[i]);
		dev_info(&chip->client->dev, "\n");
		return -EINVAL;
	}
	return 0;
}

static int max17042_init_model(struct max17042_chip *chip)
{
	int ret;
	int table_size =
		sizeof(chip->pdata->config_data->cell_char_tbl)/sizeof(u16);
	u16 *temp_data;

	temp_data = kzalloc(table_size, GFP_KERNEL);
	if (!temp_data)
		return -ENOMEM;

	max10742_unlock_model(chip);
	max17042_write_model_data(chip, MAX17042_MODELChrTbl,
				table_size);
	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
				table_size);

	ret = max17042_model_data_compare(
		chip,
		chip->pdata->config_data->cell_char_tbl,
		temp_data,
		table_size);

	max10742_lock_model(chip);
	kfree(temp_data);

	return ret;
}

static int max17042_verify_model_lock(struct max17042_chip *chip)
{
	int i;
	int table_size =
		sizeof(chip->pdata->config_data->cell_char_tbl);
	u16 *temp_data;
	int ret = 0;

	temp_data = kzalloc(table_size, GFP_KERNEL);
	if (!temp_data)
		return -ENOMEM;

	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
				table_size);
	for (i = 0; i < table_size; i++)
		if (temp_data[i])
			ret = -EINVAL;

	kfree(temp_data);
	return ret;
}

static void max17042_write_config_regs(struct max17042_chip *chip)
{
	struct max17042_config_data *config = chip->pdata->config_data;

	max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
	max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
	max17042_write_reg(chip->client, MAX17042_FilterCFG,
			config->filter_cfg);
	max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
}

static void  max17042_write_custom_regs(struct max17042_chip *chip)
{
	struct max17042_config_data *config = chip->pdata->config_data;

	max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
				config->rcomp0);
	max17042_write_verify_reg(chip->client, MAX17042_TempCo,
				config->tcompc0);
	max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
			config->empty_tempco);
	max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
				config->kempty0);
	max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
				config->ichgt_term);
}

static void max17042_update_capacity_regs(struct max17042_chip *chip)
{
	struct max17042_config_data *config = chip->pdata->config_data;

	max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
				config->fullcap);
	max17042_write_reg(chip->client, MAX17042_DesignCap,
			config->design_cap);
	max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
				config->fullcapnom);
}

static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
{
	u16 vfSoc;

	vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
	max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
	max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
	max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
}

static void max17042_load_new_capacity_params(struct max17042_chip *chip)
{
	u16 full_cap0, rep_cap, dq_acc, vfSoc;
	u32 rem_cap;

	struct max17042_config_data *config = chip->pdata->config_data;

	full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
	vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);

	/* fg_vfSoc needs to shifted by 8 bits to get the
	 * perc in 1% accuracy, to get the right rem_cap multiply
	 * full_cap0, fg_vfSoc and devide by 100
	 */
	rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
	max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);

	rep_cap = (u16)rem_cap;
	max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);

	/* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
	dq_acc = config->fullcap / dQ_ACC_DIV;
	max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
	max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);

	max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
			config->fullcap);
	max17042_write_reg(chip->client, MAX17042_DesignCap,
			config->design_cap);
	max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
			config->fullcapnom);
}

/*
 * Block write all the override values coming from platform data.
 * This function MUST be called before the POR initialization proceedure
 * specified by maxim.
 */
static inline void max17042_override_por_values(struct max17042_chip *chip)
{
	struct i2c_client *client = chip->client;
	struct max17042_config_data *config = chip->pdata->config_data;

	max17042_override_por(client, MAX17042_TGAIN, config->tgain);
	max17042_override_por(client, MAx17042_TOFF, config->toff);
	max17042_override_por(client, MAX17042_CGAIN, config->cgain);
	max17042_override_por(client, MAX17042_COFF, config->coff);

	max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
	max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
	max17042_override_por(client, MAX17042_SALRT_Th,
			config->soc_alrt_thresh);
	max17042_override_por(client, MAX17042_CONFIG, config->config);
	max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);

	max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
	max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);

	max17042_override_por(client, MAX17042_AtRate, config->at_rate);
	max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
	max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
	max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
	max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
	max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);

	max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
	max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
	max17042_override_por(client, MAX17042_SOC_empty, config->socempty);
	max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
	max17042_override_por(client, MAX17042_dQacc, config->dqacc);
	max17042_override_por(client, MAX17042_dPacc, config->dpacc);

	max17042_override_por(client, MAX17042_V_empty, config->vempty);
	max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
	max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
	max17042_override_por(client, MAX17042_FCTC, config->fctc);
	max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
	max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
	max17042_override_por(client, MAX17042_EmptyTempCo,
			config->empty_tempco);
	max17042_override_por(client, MAX17042_K_empty0, config->kempty0);
}

static int max17042_init_chip(struct max17042_chip *chip)
{
	int ret;
	int val;

	max17042_override_por_values(chip);
	/* After Power up, the MAX17042 requires 500mS in order
	 * to perform signal debouncing and initial SOC reporting
	 */
	msleep(500);

	/* Initialize configaration */
	max17042_write_config_regs(chip);

	/* write cell characterization data */
	ret = max17042_init_model(chip);
	if (ret) {
		dev_err(&chip->client->dev, "%s init failed\n",
			__func__);
		return -EIO;
	}
	max17042_verify_model_lock(chip);
	if (ret) {
		dev_err(&chip->client->dev, "%s lock verify failed\n",
			__func__);
		return -EIO;
	}
	/* write custom parameters */
	max17042_write_custom_regs(chip);

	/* update capacity params */
	max17042_update_capacity_regs(chip);

	/* delay must be atleast 350mS to allow VFSOC
	 * to be calculated from the new configuration
	 */
	msleep(350);

	/* reset vfsoc0 reg */
	max17042_reset_vfsoc0_reg(chip);

	/* load new capacity params */
	max17042_load_new_capacity_params(chip);

	/* Init complete, Clear the POR bit */
	val = max17042_read_reg(chip->client, MAX17042_STATUS);
	max17042_write_reg(chip->client, MAX17042_STATUS,
			val & (~STATUS_POR_BIT));
	return 0;
}


static void max17042_init_worker(struct work_struct *work)
{
	struct max17042_chip *chip = container_of(work,
				struct max17042_chip, work);
	int ret;

	/* Initialize registers according to values from the platform data */
	if (chip->pdata->enable_por_init && chip->pdata->config_data) {
		ret = max17042_init_chip(chip);
		if (ret)
			return;
	}

	chip->init_complete = 1;
}

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;
	int reg;

	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);

	/* When current is not measured,
	 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
	if (!chip->pdata->enable_current_sense)
		chip->battery.num_properties -= 2;

	if (chip->pdata->r_sns == 0)
		chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;

	if (chip->pdata->init_data)
		max17042_set_reg(client, chip->pdata->init_data,
				chip->pdata->num_init_data);

	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);
	}

	reg = max17042_read_reg(chip->client, MAX17042_STATUS);

	if (reg & STATUS_POR_BIT) {
		INIT_WORK(&chip->work, max17042_init_worker);
		schedule_work(&chip->work);
	} else {
		chip->init_complete = 1;
	}

	ret = power_supply_register(&client->dev, &chip->battery);
	if (ret) {
		dev_err(&client->dev, "failed: power supply register\n");
		kfree(chip);
	}
	return ret;
}

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");
Commit	Line	Data
359ab9f5 MH	1	/*
	2	* Fuel gauge driver for Maxim 17042 / 8966 / 8997
	3	* Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
	4	*
	5	* Copyright (C) 2011 Samsung Electronics
	6	* MyungJoo Ham <myungjoo.ham@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	* This driver is based on max17040_battery.c
	23	*/
	24
	25	#include <linux/init.h>
7e6d62db	26	#include <linux/module.h>
359ab9f5 MH	27	#include <linux/slab.h>
359ab9f5 MH	28	#include <linux/i2c.h>
f3a71a6e	29	#include <linux/delay.h>
359ab9f5 MH	30	#include <linux/mod_devicetable.h>
	31	#include <linux/power_supply.h>
	32	#include <linux/power/max17042_battery.h>
	33
f3a71a6e RP	34	/* Status register bits */
	35	#define STATUS_POR_BIT (1 << 1)
	36	#define STATUS_BST_BIT (1 << 3)
	37	#define STATUS_VMN_BIT (1 << 8)
	38	#define STATUS_TMN_BIT (1 << 9)
	39	#define STATUS_SMN_BIT (1 << 10)
	40	#define STATUS_BI_BIT (1 << 11)
	41	#define STATUS_VMX_BIT (1 << 12)
	42	#define STATUS_TMX_BIT (1 << 13)
	43	#define STATUS_SMX_BIT (1 << 14)
	44	#define STATUS_BR_BIT (1 << 15)
	45
	46	#define VFSOC0_LOCK 0x0000
	47	#define VFSOC0_UNLOCK 0x0080
	48	#define MODEL_UNLOCK1 0X0059
	49	#define MODEL_UNLOCK2 0X00C4
	50	#define MODEL_LOCK1 0X0000
	51	#define MODEL_LOCK2 0X0000
	52
	53	#define dQ_ACC_DIV 0x4
	54	#define dP_ACC_100 0x1900
	55	#define dP_ACC_200 0x3200
	56
359ab9f5 MH	57	struct max17042_chip {
	58	struct i2c_client *client;
	59	struct power_supply battery;
	60	struct max17042_platform_data *pdata;
f3a71a6e RP	61	struct work_struct work;
f3a71a6e RP	62	int init_complete;
359ab9f5 MH	63	};
	64
	65	static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
	66	{
	67	int ret = i2c_smbus_write_word_data(client, reg, value);
	68
	69	if (ret < 0)
	70	dev_err(&client->dev, "%s: err %d\n", __func__, ret);
	71
	72	return ret;
	73	}
	74
	75	static int max17042_read_reg(struct i2c_client *client, u8 reg)
	76	{
	77	int ret = i2c_smbus_read_word_data(client, reg);
	78
	79	if (ret < 0)
	80	dev_err(&client->dev, "%s: err %d\n", __func__, ret);
	81
	82	return ret;
	83	}
	84
086ef502 DK	85	static void max17042_set_reg(struct i2c_client *client,
	86	struct max17042_reg_data *data, int size)
	87	{
	88	int i;
	89
	90	for (i = 0; i < size; i++)
	91	max17042_write_reg(client, data[i].addr, data[i].data);
	92	}
	93
359ab9f5	94	static enum power_supply_property max17042_battery_props[] = {
086ef502 DK	95	POWER_SUPPLY_PROP_PRESENT,
	96	POWER_SUPPLY_PROP_CYCLE_COUNT,
	97	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	98	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
359ab9f5 MH	99	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	100	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	101	POWER_SUPPLY_PROP_CAPACITY,
086ef502 DK	102	POWER_SUPPLY_PROP_CHARGE_FULL,
	103	POWER_SUPPLY_PROP_TEMP,
	104	POWER_SUPPLY_PROP_CURRENT_NOW,
	105	POWER_SUPPLY_PROP_CURRENT_AVG,
359ab9f5 MH	106	};
	107
	108	static int max17042_get_property(struct power_supply *psy,
	109	enum power_supply_property psp,
	110	union power_supply_propval *val)
	111	{
	112	struct max17042_chip *chip = container_of(psy,
	113	struct max17042_chip, battery);
60a1f6e4	114	int ret;
359ab9f5	115
f3a71a6e RP	116	if (!chip->init_complete)
	117	return -EAGAIN;
	118
359ab9f5	119	switch (psp) {
086ef502	120	case POWER_SUPPLY_PROP_PRESENT:
60a1f6e4 RP	121	ret = max17042_read_reg(chip->client, MAX17042_STATUS);
	122	if (ret < 0)
	123	return ret;
	124
	125	if (ret & MAX17042_STATUS_BattAbsent)
086ef502 DK	126	val->intval = 0;
	127	else
	128	val->intval = 1;
	129	break;
	130	case POWER_SUPPLY_PROP_CYCLE_COUNT:
60a1f6e4 RP	131	ret = max17042_read_reg(chip->client, MAX17042_Cycles);
	132	if (ret < 0)
	133	return ret;
	134
	135	val->intval = ret;
086ef502 DK	136	break;
086ef502 DK	137	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
60a1f6e4 RP	138	ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
	139	if (ret < 0)
	140	return ret;
	141
	142	val->intval = ret >> 8;
086ef502 DK	143	val->intval = 20000; / Units of LSB = 20mV */
	144	break;
	145	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
60a1f6e4 RP	146	ret = max17042_read_reg(chip->client, MAX17042_V_empty);
	147	if (ret < 0)
	148	return ret;
	149
	150	val->intval = ret >> 7;
086ef502 DK	151	val->intval = 10000; / Units of LSB = 10mV */
086ef502 DK	152	break;
359ab9f5	153	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
60a1f6e4 RP	154	ret = max17042_read_reg(chip->client, MAX17042_VCELL);
	155	if (ret < 0)
	156	return ret;
	157
	158	val->intval = ret * 625 / 8;
359ab9f5 MH	159	break;
359ab9f5 MH	160	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
60a1f6e4 RP	161	ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
	162	if (ret < 0)
	163	return ret;
	164
	165	val->intval = ret * 625 / 8;
359ab9f5 MH	166	break;
359ab9f5 MH	167	case POWER_SUPPLY_PROP_CAPACITY:
60a1f6e4 RP	168	ret = max17042_read_reg(chip->client, MAX17042_SOC);
	169	if (ret < 0)
	170	return ret;
	171
	172	val->intval = ret >> 8;
359ab9f5	173	break;
086ef502	174	case POWER_SUPPLY_PROP_CHARGE_FULL:
60a1f6e4 RP	175	ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
	176	if (ret < 0)
	177	return ret;
	178
	179	if ((ret >> 8) >= MAX17042_BATTERY_FULL)
086ef502	180	val->intval = 1;
60a1f6e4	181	else if (ret >= 0)
086ef502 DK	182	val->intval = 0;
	183	break;
	184	case POWER_SUPPLY_PROP_TEMP:
60a1f6e4 RP	185	ret = max17042_read_reg(chip->client, MAX17042_TEMP);
	186	if (ret < 0)
	187	return ret;
	188
	189	val->intval = ret;
086ef502 DK	190	/* The value is signed. */
	191	if (val->intval & 0x8000) {
	192	val->intval = (0x7fff & ~val->intval) + 1;
	193	val->intval *= -1;
	194	}
	195	/* The value is converted into deci-centigrade scale */
	196	/* Units of LSB = 1 / 256 degree Celsius */
	197	val->intval = val->intval * 10 / 256;
	198	break;
	199	case POWER_SUPPLY_PROP_CURRENT_NOW:
	200	if (chip->pdata->enable_current_sense) {
60a1f6e4 RP	201	ret = max17042_read_reg(chip->client, MAX17042_Current);
	202	if (ret < 0)
	203	return ret;
	204
	205	val->intval = ret;
086ef502 DK	206	if (val->intval & 0x8000) {
	207	/* Negative */
	208	val->intval = ~val->intval & 0x7fff;
	209	val->intval++;
	210	val->intval *= -1;
	211	}
91d8b0d6	212	val->intval *= 1562500 / chip->pdata->r_sns;
086ef502 DK	213	} else {
	214	return -EINVAL;
	215	}
	216	break;
	217	case POWER_SUPPLY_PROP_CURRENT_AVG:
	218	if (chip->pdata->enable_current_sense) {
60a1f6e4 RP	219	ret = max17042_read_reg(chip->client,
	220	MAX17042_AvgCurrent);
	221	if (ret < 0)
	222	return ret;
	223
	224	val->intval = ret;
086ef502 DK	225	if (val->intval & 0x8000) {
	226	/* Negative */
	227	val->intval = ~val->intval & 0x7fff;
	228	val->intval++;
	229	val->intval *= -1;
	230	}
	231	val->intval *= 1562500 / chip->pdata->r_sns;
	232	} else {
	233	return -EINVAL;
	234	}
	235	break;
359ab9f5 MH	236	default:
	237	return -EINVAL;
	238	}
	239	return 0;
	240	}
	241
f3a71a6e RP	242	static int max17042_write_verify_reg(struct i2c_client *client,
	243	u8 reg, u16 value)
	244	{
	245	int retries = 8;
	246	int ret;
	247	u16 read_value;
	248
	249	do {
	250	ret = i2c_smbus_write_word_data(client, reg, value);
	251	read_value = max17042_read_reg(client, reg);
	252	if (read_value != value) {
	253	ret = -EIO;
	254	retries--;
	255	}
	256	} while (retries && read_value != value);
	257
	258	if (ret < 0)
	259	dev_err(&client->dev, "%s: err %d\n", __func__, ret);
	260
	261	return ret;
	262	}
	263
	264	static inline void max17042_override_por(
	265	struct i2c_client *client, u8 reg, u16 value)
	266	{
	267	if (value)
	268	max17042_write_reg(client, reg, value);
	269	}
	270
	271	static inline void max10742_unlock_model(struct max17042_chip *chip)
	272	{
	273	struct i2c_client *client = chip->client;
	274	max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
	275	max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
	276	}
	277
	278	static inline void max10742_lock_model(struct max17042_chip *chip)
	279	{
	280	struct i2c_client *client = chip->client;
	281	max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
	282	max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
	283	}
	284
	285	static inline void max17042_write_model_data(struct max17042_chip *chip,
	286	u8 addr, int size)
	287	{
	288	struct i2c_client *client = chip->client;
	289	int i;
	290	for (i = 0; i < size; i++)
	291	max17042_write_reg(client, addr + i,
	292	chip->pdata->config_data->cell_char_tbl[i]);
	293	}
	294
	295	static inline void max17042_read_model_data(struct max17042_chip *chip,
	296	u8 addr, u16 *data, int size)
	297	{
	298	struct i2c_client *client = chip->client;
	299	int i;
	300
	301	for (i = 0; i < size; i++)
	302	data[i] = max17042_read_reg(client, addr + i);
	303	}
	304
	305	static inline int max17042_model_data_compare(struct max17042_chip *chip,
306	u16 data1, u16 data2, int size)
307	{
308	int i;
309
310	if (memcmp(data1, data2, size)) {
311	dev_err(&chip->client->dev, "%s compare failed\n", __func__);
312	for (i = 0; i < size; i++)
313	dev_info(&chip->client->dev, "0x%x, 0x%x",
314	data1[i], data2[i]);
315	dev_info(&chip->client->dev, "\n");
316	return -EINVAL;
317	}
318	return 0;
319	}
320
321	static int max17042_init_model(struct max17042_chip *chip)
322	{
323	int ret;
324	int table_size =
325	sizeof(chip->pdata->config_data->cell_char_tbl)/sizeof(u16);
326	u16 *temp_data;
327
328	temp_data = kzalloc(table_size, GFP_KERNEL);
329	if (!temp_data)
330	return -ENOMEM;
331
332	max10742_unlock_model(chip);
333	max17042_write_model_data(chip, MAX17042_MODELChrTbl,
334	table_size);
335	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
336	table_size);
337
338	ret = max17042_model_data_compare(
339	chip,
340	chip->pdata->config_data->cell_char_tbl,
341	temp_data,
342	table_size);
343
344	max10742_lock_model(chip);
345	kfree(temp_data);
346
347	return ret;
348	}
349
350	static int max17042_verify_model_lock(struct max17042_chip *chip)
351	{
352	int i;
353	int table_size =
354	sizeof(chip->pdata->config_data->cell_char_tbl);
355	u16 *temp_data;
356	int ret = 0;
357
358	temp_data = kzalloc(table_size, GFP_KERNEL);
359	if (!temp_data)
360	return -ENOMEM;
361
362	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
363	table_size);
364	for (i = 0; i < table_size; i++)
365	if (temp_data[i])
366	ret = -EINVAL;
367
368	kfree(temp_data);
369	return ret;
370	}
371
372	static void max17042_write_config_regs(struct max17042_chip *chip)
373	{
374	struct max17042_config_data *config = chip->pdata->config_data;
375
376	max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
377	max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
378	max17042_write_reg(chip->client, MAX17042_FilterCFG,
379	config->filter_cfg);
380	max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
381	}
382
383	static void max17042_write_custom_regs(struct max17042_chip *chip)
384	{
385	struct max17042_config_data *config = chip->pdata->config_data;
386
387	max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
388	config->rcomp0);
389	max17042_write_verify_reg(chip->client, MAX17042_TempCo,
390	config->tcompc0);
391	max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
392	config->empty_tempco);
393	max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
394	config->kempty0);
395	max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
396	config->ichgt_term);
397	}
398
399	static void max17042_update_capacity_regs(struct max17042_chip *chip)
400	{
401	struct max17042_config_data *config = chip->pdata->config_data;
402
403	max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
404	config->fullcap);
405	max17042_write_reg(chip->client, MAX17042_DesignCap,
406	config->design_cap);
407	max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
408	config->fullcapnom);
409	}
410
411	static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
412	{
413	u16 vfSoc;
414
415	vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
416	max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
417	max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
418	max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
419	}
420
421	static void max17042_load_new_capacity_params(struct max17042_chip *chip)
422	{
423	u16 full_cap0, rep_cap, dq_acc, vfSoc;
424	u32 rem_cap;
425
426	struct max17042_config_data *config = chip->pdata->config_data;
427
428	full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
429	vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
430
431	/* fg_vfSoc needs to shifted by 8 bits to get the
432	* perc in 1% accuracy, to get the right rem_cap multiply
433	* full_cap0, fg_vfSoc and devide by 100
434	*/
435	rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
436	max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);
437
438	rep_cap = (u16)rem_cap;
439	max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);
440
441	/* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
442	dq_acc = config->fullcap / dQ_ACC_DIV;
443	max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
444	max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);
445
446	max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
447	config->fullcap);
448	max17042_write_reg(chip->client, MAX17042_DesignCap,
449	config->design_cap);
450	max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
451	config->fullcapnom);
452	}
453
454	/*
455	* Block write all the override values coming from platform data.
456	* This function MUST be called before the POR initialization proceedure
457	* specified by maxim.
458	*/
459	static inline void max17042_override_por_values(struct max17042_chip *chip)
460	{
461	struct i2c_client *client = chip->client;
462	struct max17042_config_data *config = chip->pdata->config_data;
463
464	max17042_override_por(client, MAX17042_TGAIN, config->tgain);
465	max17042_override_por(client, MAx17042_TOFF, config->toff);
466	max17042_override_por(client, MAX17042_CGAIN, config->cgain);
467	max17042_override_por(client, MAX17042_COFF, config->coff);
468
469	max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
470	max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
471	max17042_override_por(client, MAX17042_SALRT_Th,
472	config->soc_alrt_thresh);
473	max17042_override_por(client, MAX17042_CONFIG, config->config);
474	max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);
475
476	max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
477	max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);
478
479	max17042_override_por(client, MAX17042_AtRate, config->at_rate);
480	max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
481	max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
482	max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
483	max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
484	max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);
485
486	max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
487	max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
488	max17042_override_por(client, MAX17042_SOC_empty, config->socempty);
489	max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
490	max17042_override_por(client, MAX17042_dQacc, config->dqacc);
491	max17042_override_por(client, MAX17042_dPacc, config->dpacc);
492
493	max17042_override_por(client, MAX17042_V_empty, config->vempty);
494	max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
495	max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
496	max17042_override_por(client, MAX17042_FCTC, config->fctc);
497	max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
498	max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
499	max17042_override_por(client, MAX17042_EmptyTempCo,
500	config->empty_tempco);
501	max17042_override_por(client, MAX17042_K_empty0, config->kempty0);
502	}
503
504	static int max17042_init_chip(struct max17042_chip *chip)
505	{
506	int ret;
507	int val;
508
509	max17042_override_por_values(chip);
510	/* After Power up, the MAX17042 requires 500mS in order
511	* to perform signal debouncing and initial SOC reporting
512	*/
513	msleep(500);
514
515	/* Initialize configaration */
516	max17042_write_config_regs(chip);
517
518	/* write cell characterization data */
519	ret = max17042_init_model(chip);
520	if (ret) {
521	dev_err(&chip->client->dev, "%s init failed\n",
522	__func__);
523	return -EIO;
524	}
525	max17042_verify_model_lock(chip);
526	if (ret) {
527	dev_err(&chip->client->dev, "%s lock verify failed\n",
528	__func__);
529	return -EIO;
530	}
531	/* write custom parameters */
532	max17042_write_custom_regs(chip);
533
534	/* update capacity params */
535	max17042_update_capacity_regs(chip);
536
537	/* delay must be atleast 350mS to allow VFSOC
538	* to be calculated from the new configuration
539	*/
540	msleep(350);
541
542	/* reset vfsoc0 reg */
543	max17042_reset_vfsoc0_reg(chip);
544
545	/* load new capacity params */
546	max17042_load_new_capacity_params(chip);
547
548	/* Init complete, Clear the POR bit */
549	val = max17042_read_reg(chip->client, MAX17042_STATUS);
550	max17042_write_reg(chip->client, MAX17042_STATUS,
551	val & (~STATUS_POR_BIT));
552	return 0;
553	}
554
555
556	static void max17042_init_worker(struct work_struct *work)
557	{
558	struct max17042_chip *chip = container_of(work,
559	struct max17042_chip, work);
560	int ret;
561
562	/* Initialize registers according to values from the platform data */
563	if (chip->pdata->enable_por_init && chip->pdata->config_data) {
564	ret = max17042_init_chip(chip);
565	if (ret)
566	return;
567	}
568
569	chip->init_complete = 1;
570	}
571
359ab9f5 MH	572	static int __devinit max17042_probe(struct i2c_client *client,
	573	const struct i2c_device_id *id)
	574	{
	575	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	576	struct max17042_chip *chip;
	577	int ret;
f3a71a6e	578	int reg;
359ab9f5 MH	579
	580	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
	581	return -EIO;
	582
	583	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	584	if (!chip)
	585	return -ENOMEM;
	586
	587	chip->client = client;
	588	chip->pdata = client->dev.platform_data;
	589
	590	i2c_set_clientdata(client, chip);
	591
	592	chip->battery.name = "max17042_battery";
	593	chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	594	chip->battery.get_property = max17042_get_property;
	595	chip->battery.properties = max17042_battery_props;
	596	chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
	597
086ef502 DK	598	/* When current is not measured,
	599	* CURRENT_NOW and CURRENT_AVG properties should be invisible. */
	600	if (!chip->pdata->enable_current_sense)
	601	chip->battery.num_properties -= 2;
	602
4cfa892c PR	603	if (chip->pdata->r_sns == 0)
	604	chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
	605
086ef502 DK	606	if (chip->pdata->init_data)
086ef502 DK	607	max17042_set_reg(client, chip->pdata->init_data,
f3a71a6e	608	chip->pdata->num_init_data);
086ef502	609
359ab9f5 MH	610	if (!chip->pdata->enable_current_sense) {
	611	max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
	612	max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
	613	max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
	614	}
	615
f3a71a6e RP	616	reg = max17042_read_reg(chip->client, MAX17042_STATUS);
	617
	618	if (reg & STATUS_POR_BIT) {
	619	INIT_WORK(&chip->work, max17042_init_worker);
	620	schedule_work(&chip->work);
	621	} else {
	622	chip->init_complete = 1;
	623	}
	624
	625	ret = power_supply_register(&client->dev, &chip->battery);
	626	if (ret) {
	627	dev_err(&client->dev, "failed: power supply register\n");
	628	kfree(chip);
	629	}
	630	return ret;
359ab9f5 MH	631	}
	632
	633	static int __devexit max17042_remove(struct i2c_client *client)
	634	{
	635	struct max17042_chip *chip = i2c_get_clientdata(client);
	636
	637	power_supply_unregister(&chip->battery);
359ab9f5 MH	638	kfree(chip);
	639	return 0;
	640	}
	641
	642	static const struct i2c_device_id max17042_id[] = {
	643	{ "max17042", 0 },
	644	{ }
	645	};
	646	MODULE_DEVICE_TABLE(i2c, max17042_id);
	647
	648	static struct i2c_driver max17042_i2c_driver = {
	649	.driver = {
	650	.name = "max17042",
	651	},
	652	.probe = max17042_probe,
	653	.remove = __devexit_p(max17042_remove),
	654	.id_table = max17042_id,
	655	};
	656
	657	static int __init max17042_init(void)
	658	{
	659	return i2c_add_driver(&max17042_i2c_driver);
	660	}
	661	module_init(max17042_init);
	662
	663	static void __exit max17042_exit(void)
	664	{
	665	i2c_del_driver(&max17042_i2c_driver);
	666	}
	667	module_exit(max17042_exit);
	668
	669	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
	670	MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
	671	MODULE_LICENSE("GPL");