drivers/power/bq27x00_battery.c

/*
 * BQ27x00 battery driver
 *
 * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
 * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
 * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
 * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
 *
 * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
 *
 * This package 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.
 *
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 */

/*
 * Datasheets:
 * http://focus.ti.com/docs/prod/folders/print/bq27000.html
 * http://focus.ti.com/docs/prod/folders/print/bq27500.html
 */

#include <linux/module.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/idr.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <asm/unaligned.h>

#include <linux/power/bq27x00_battery.h>

#define DRIVER_VERSION			"1.2.0"

#define G3_FW_VERSION			0x0324
#define L1_FW_VERSION			0x0600

#define CONTROL_CMD			0x00
/* Subcommands of Control() */
#define DEV_TYPE_SUBCMD			0x0001
#define FW_VER_SUBCMD			0x0002
#define DF_VER_SUBCMD			0x001F
#define RESET_SUBCMD			0x0041

#define INVALID_REG_ADDR		0xFF

#define DEBUG_INFO_LEN			20

enum bq27x00_reg_index {
	BQ27x00_REG_TEMP = 0,
	BQ27x00_REG_INT_TEMP,
	BQ27x00_REG_VOLT,
	BQ27x00_REG_AI,
	BQ27x00_REG_FLAGS,
	BQ27x00_REG_TTE,
	BQ27x00_REG_TTF,
	BQ27x00_REG_TTES,
	BQ27x00_REG_TTECP,
	BQ27x00_REG_NAC,
	BQ27x00_REG_LMD,
	BQ27x00_REG_CYCT,
	BQ27x00_REG_AE,
	BQ27000_REG_RSOC,
	BQ27000_REG_ILMD,
	BQ27500_REG_SOC,
	BQ27500_REG_DCAP,
	BQ27500_REG_CTRL,
	BQ27500_REG_RAW_SOC,

	BQ27500_REG_FAC,
	BQ27500_REG_RM,
	BQ27500_REG_FCC,
	BQ27500_REG_SOH,
	BQ27500_REG_CC,
	BQ27500_REG_OC,
};

/* TI G3 Firmware (v3.24) */
static u8 bq27x00_fw_g3_regs[] = {
	0x06,
	0x36,
	0x08,
	0x14,
	0x0A,
	0x16,
	0x18,
	0x1c,
	0x26,
	0x0C,
	0x12,
	0x2A,
	0x22,
	0x0B,
	0x76,
	0x2C,
	0x3C,
	0x00,
	0xFF,
	0x0E,
	0x10,
	0x12,
	0x28,
	0x2A,
	0x3A,
};

/*
 * TI L1 firmware (v6.00)
 * Some of the commented registers are missing in this fw.
 * Mark them as 0xFF for being invalid
 */
static u8 bq27x00_fw_l1_regs[] = {
	0x06,
	0x28,
	0x08,
	0x14,
	0x0A,
	0x16,
	0xFF, /* TTF */
	0x1A,
	0xFF, /* TTECP */
	0x0C,
	0xFF, /* LMD */
	0x1E,
	0xFF, /* AE */
	0xFF, /* RSOC */
	0xFF, /* ILMD */
	0x20,
	0x2E,
	0x00,
	0x74,
	0x0E,
	0x10,
	0x12,
	0x1C,
	0x1E,
	0x2C
};


#define BQ27000_FLAG_CHGS		BIT(7)
#define BQ27000_FLAG_FC			BIT(5)

#define BQ27500_FLAG_DSC		BIT(0)
#define BQ27500_FLAG_FC			BIT(9)

#define BQ27000_RS			20 /* Resistor sense */

struct bq27x00_device_info;
struct bq27x00_access_methods {
	int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
	int (*write)(struct bq27x00_device_info *di, u8 reg, int value,
			bool single);
};

static int bq27x00_dump_dataflash(struct bq27x00_device_info *di);
static int bq27x00_control_cmd(struct bq27x00_device_info *di, u16 cmd);
static void bq27x00_reset_registers(struct bq27x00_device_info *di);

enum bq27x00_chip { BQ27000, BQ27500 };

struct bq27x00_debug_info {
	int voltage;
	int avg_current;
	long unsigned int timestamp;
};

struct bq27x00_reg_cache {
	int temperature;
	int internal_temp;
	int time_to_empty;
	int time_to_empty_avg;
	int time_to_full;
	int charge_full;
	int cycle_count;
	int capacity;
	int raw_capacity;
	int flags;

	int current_now;
};

struct bq27x00_device_info {
	struct device 		*dev;
	int			id;
	enum bq27x00_chip	chip;

	struct bq27x00_reg_cache cache;
	int charge_design_full;
	int fake_battery;

	int (*translate_temp)(int temperature);

	unsigned long last_update;
	struct delayed_work work;
	struct delayed_work debug_work;

	struct power_supply	bat;

	struct bq27x00_access_methods bus;

	struct bq27x00_debug_info debug_info[DEBUG_INFO_LEN];
	int debug_index;
	int debug_enable;

	struct mutex lock;

	u8 *regs;
	int fw_ver;
	int df_ver;
};

static enum power_supply_property bq27x00_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_COUNTER,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_ENERGY_NOW
};


static unsigned int poll_interval = 360;
module_param(poll_interval, uint, 0644);
MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
				"0 disables polling");
/*
 * Common code for BQ27x00 devices
 */

static inline int bq27x00_read(struct bq27x00_device_info *di, int reg_index,
		bool single)
{
	int val;

	/* Reports 0 for invalid/missing registers */
	if (!di || !di->regs || di->regs[reg_index] == INVALID_REG_ADDR)
		return 0;

	val = di->bus.read(di, di->regs[reg_index], single);

	return val;
}

static inline int bq27x00_write(struct bq27x00_device_info *di, int reg_index,
		int value, bool single)
{
	if (!di || !di->regs || di->regs[reg_index] == INVALID_REG_ADDR)
		return -1;

	return di->bus.write(di, di->regs[reg_index], value, single);
}

/*
 * Return the battery Raw State-of-Charge
 * Or < 0 if something fails.
 */
static int bq27x00_battery_read_raw_soc(struct bq27x00_device_info *di)
{
	int rsoc;

	rsoc = bq27x00_read(di, BQ27500_REG_RAW_SOC, false);

	if (rsoc < 0)
		dev_err(di->dev, "error reading raw State-of-Charge\n");

	return rsoc;
}

/*
 * Return the battery Relative State-of-Charge
 * Or < 0 if something fails.
 */
static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
{
	int rsoc;

	if (di->chip == BQ27500)
		rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
	else
		rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);

	if (rsoc < 0)
		dev_err(di->dev, "error reading relative State-of-Charge\n");

	return rsoc;
}

/*
 * Return a battery charge value in µAh
 * Or < 0 if something fails.
 */
static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
{
	int charge;

	charge = bq27x00_read(di, reg, false);
	if (charge < 0) {
		dev_err(di->dev, "error reading nominal available capacity\n");
		return charge;
	}

	if (di->chip == BQ27500)
		charge *= 1000;
	else
		charge = charge * 3570 / BQ27000_RS;

	return charge;
}

/*
 * Return the battery Nominal available capaciy in µAh
 * Or < 0 if something fails.
 */
static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
{
	return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
}

/*
 * Return the battery Last measured discharge in µAh
 * Or < 0 if something fails.
 */
static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
{
	return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
}

/*
 * Return the battery Initial last measured discharge in µAh
 * Or < 0 if something fails.
 */
static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
{
	int ilmd;

	if (di->chip == BQ27500)
		ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
	else
		ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);

	if (ilmd < 0) {
		dev_err(di->dev, "error reading initial last measured discharge\n");
		return ilmd;
	}

	if (di->chip == BQ27500)
		ilmd *= 1000;
	else
		ilmd = ilmd * 256 * 3570 / BQ27000_RS;

	return ilmd;
}

/*
 * Return the battery Cycle count total
 * Or < 0 if something fails.
 */
static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
{
	int cyct;

	cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
	if (cyct < 0)
		dev_err(di->dev, "error reading cycle count total\n");

	return cyct;
}

/*
 * Read a time register.
 * Return < 0 if something fails.
 */
static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
{
	int tval;

	tval = bq27x00_read(di, reg, false);
	if (tval < 0) {
		dev_err(di->dev, "error reading register %02x: %d\n", reg, tval);
		return tval;
	}

	if (tval == 65535)
		return -ENODATA;

	return tval * 60;
}

static void bq27x00_update(struct bq27x00_device_info *di)
{
	struct bq27x00_reg_cache cache = {0, };
	bool is_bq27500 = di->chip == BQ27500;
	int i;
	int secs;
	int index = di->debug_index;

	cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500);
	if (cache.flags >= 0) {
		cache.capacity = bq27x00_battery_read_rsoc(di);
		cache.raw_capacity = bq27x00_battery_read_raw_soc(di);
		cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false);
		cache.internal_temp = bq27x00_read(di, BQ27x00_REG_INT_TEMP, false);
		cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
		cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTES);
		cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
		cache.charge_full = bq27x00_battery_read_lmd(di);
		cache.cycle_count = bq27x00_battery_read_cyct(di);

		if (!is_bq27500)
			cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false);

		/* We only have to read charge design full once */
		if (di->charge_design_full <= 0)
			di->charge_design_full = bq27x00_battery_read_ilmd(di);
	}

	/*
	 * For debugging use if debug_enable is set.
	 * Dumps out 1HZ recording of voltage and avg current
	 */
	if (di->debug_enable > 0) {
		/* Calculate seconds since last report */
		secs = jiffies_to_msecs(jiffies-di->last_update)/1000;
		dev_info(di->dev, "%s: Debug info for last %d seconds\n",
			__func__, secs);

		/* Debug info is printed LIFO */
		for (i = 0; i < secs && secs < DEBUG_INFO_LEN ; i++) {
			index = (index == 0) ? DEBUG_INFO_LEN-1 : index-1;

			if (di->debug_info[index].voltage > 0) {
				dev_info(di->dev, "{%d,%d,%010lu}\n",
					di->debug_info[index].voltage,
					di->debug_info[index].avg_current/1000,
					di->debug_info[index].timestamp);
			}
		}
	}

	/* Ignore current_now which is a snapshot of the current battery state
	 * and is likely to be different even between two consecutive reads */
	if (memcmp(&di->cache, &cache, sizeof(cache) - sizeof(int)) != 0) {
		di->cache = cache;
		power_supply_changed(&di->bat);
	}

	di->last_update = jiffies;
}

static void bq27x00_battery_poll(struct work_struct *work)
{
	struct bq27x00_device_info *di =
		container_of(work, struct bq27x00_device_info, work.work);

	if (poll_interval > 0) {
		bq27x00_update(di);
		/* The timer does not have to be accurate. */
		set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
		schedule_delayed_work(&di->work, poll_interval * HZ);
	}

	return;
}


/*
 * Return the battery temperature in tenths of degree Celsius
 * Or < 0 if something fails.
 */
static int bq27x00_battery_temperature(struct bq27x00_device_info *di,
	union power_supply_propval *val)
{
	int temperature;

	if (di->cache.temperature < 0)
		return di->cache.temperature;

	if (di->chip == BQ27500)
		temperature = di->cache.temperature - 2731;
	else
		temperature = ((di->cache.temperature * 5) - 5463) / 2;

	/* let the board translate the thermistor reading if necessary */
	if (di->translate_temp)
		temperature = di->translate_temp(temperature);

	/*
	 * If the reading indicates missing/malfunctioning battery thermistor,
	 * fall back on the internal temperature reading.
	 */
	if (temperature < -350) {
		static int once = 0;

		if (!once) {
			dev_warn(di->dev, "Battery thermistor missing or malfunctioning, falling back to "
					"gas gauge internal temp\n");
			once = 1;
		}

		if (di->chip == BQ27500)
			temperature = di->cache.internal_temp - 2731;
		else
			temperature = ((di->cache.internal_temp * 5) - 5463) / 2;

		/*
		 * Offset by 20 C since the board will run hotter than the battery.
		 */
		temperature -= 200;
		di->fake_battery = 1;
	} else {
		/* if we ever get a valid reading we must not have a fake battery */
		di->fake_battery = 0;
	}
	
	val->intval = temperature;

	return 0;
}

/*
 * Return the battery average current in µA
 * Note that current can be negative signed as well
 * Or 0 if something fails.
 */
static int bq27x00_battery_current(struct bq27x00_device_info *di,
	union power_supply_propval *val)
{
	int curr;

	if (di->chip == BQ27500)
	    curr = bq27x00_read(di, BQ27x00_REG_AI, false);
	else
	    curr = di->cache.current_now;

#if 0
	if (curr < 0)
		return curr;
#endif

	if (di->chip == BQ27500) {
		/* bq27500 returns signed value */
		val->intval = (int)((s16)curr) * 1000;
	} else {
		if (di->cache.flags & BQ27000_FLAG_CHGS) {
			dev_dbg(di->dev, "negative current!\n");
			curr = -curr;
		}

		val->intval = curr * 3570 / BQ27000_RS;
	}

	return 0;
}

static int bq27x00_battery_status(struct bq27x00_device_info *di,
	union power_supply_propval *val)
{
	int status;

	if (di->chip == BQ27500) {
		if (di->cache.flags & BQ27500_FLAG_FC)
			status = POWER_SUPPLY_STATUS_FULL;
		else if (di->cache.flags & BQ27500_FLAG_DSC)
			status = POWER_SUPPLY_STATUS_DISCHARGING;
		else
			status = POWER_SUPPLY_STATUS_CHARGING;
	} else {
		if (di->cache.flags & BQ27000_FLAG_FC)
			status = POWER_SUPPLY_STATUS_FULL;
		else if (di->cache.flags & BQ27000_FLAG_CHGS)
			status = POWER_SUPPLY_STATUS_CHARGING;
		else if (power_supply_am_i_supplied(&di->bat))
			status = POWER_SUPPLY_STATUS_NOT_CHARGING;
		else
			status = POWER_SUPPLY_STATUS_DISCHARGING;
	}

	val->intval = status;

	return 0;
}

/*
 * Return the battery Voltage in milivolts
 * Or < 0 if something fails.
 */
static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
	union power_supply_propval *val)
{
	int volt;

	volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
	if (volt < 0)
		return volt;

	val->intval = volt * 1000;

	return 0;
}

/*
 * Return the battery Available energy in µWh
 * Or < 0 if something fails.
 */
static int bq27x00_battery_energy(struct bq27x00_device_info *di,
	union power_supply_propval *val)
{
	int ae;

	ae = bq27x00_read(di, BQ27x00_REG_AE, false);
	if (ae < 0) {
		dev_err(di->dev, "error reading available energy\n");
		return ae;
	}

	if (di->chip == BQ27500)
		ae *= 1000;
	else
		ae = ae * 29200 / BQ27000_RS;

	val->intval = ae;

	return 0;
}

/*
 * Return the coulumb counter in mAh
 * Positive value means charge is going out of the battery
 * Negative value means charge is going into the battery
 */
static int bq27x00_read_block_i2c(struct bq27x00_device_info *di, u8 reg,
		unsigned char *buf, size_t len);
static int bq27x00_battery_qpassed(struct bq27x00_device_info *di,
	union power_supply_propval *val) {

	unsigned char q_data[10];
	size_t q_size = 10;

	/* This block of data must be read in one shot.
	 * Even though we are only interested 2 registers.
	 */
	bq27x00_read_block_i2c(di, 0x61, q_data, q_size);
	val->intval = (int)((s16)((q_data[4] << 8) | q_data[3]));

	return 0;
}


static int bq27x00_simple_value(int value,
	union power_supply_propval *val)
{
	if (value < 0)
		return value;

	val->intval = value;

	return 0;
}

#define to_bq27x00_device_info(x) container_of((x), \
				struct bq27x00_device_info, bat);

static int bq27x00_battery_get_property(struct power_supply *psy,
					enum power_supply_property psp,
					union power_supply_propval *val)
{
	int ret = 0;
	struct bq27x00_device_info *di = to_bq27x00_device_info(psy);

	mutex_lock(&di->lock);
	if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
		cancel_delayed_work_sync(&di->work);
		bq27x00_battery_poll(&di->work.work);
	}
	mutex_unlock(&di->lock);

	if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
		return -ENODEV;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = bq27x00_battery_status(di, val);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = bq27x00_battery_voltage(di, val);
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = di->cache.flags < 0 ? 0 : 1;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		ret = bq27x00_battery_current(di, val);
		break;
	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		ret = bq27x00_simple_value(di->cache.raw_capacity, val);
		break;
	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
		ret = bq27x00_battery_qpassed(di, val);
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		if (di->fake_battery) {
			val->intval = 96;
			ret = 0;
		} else {
			ret = bq27x00_simple_value(di->cache.capacity, val);
		}
		break;
	case POWER_SUPPLY_PROP_TEMP:
		ret = bq27x00_battery_temperature(di, val);
		break;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
		ret = bq27x00_simple_value(di->cache.time_to_empty, val);
		break;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
		ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
		break;
	case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
		ret = bq27x00_simple_value(di->cache.time_to_full, val);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
		ret = bq27x00_simple_value(di->cache.charge_full, val);
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
		ret = bq27x00_simple_value(di->charge_design_full, val);
		break;
	case POWER_SUPPLY_PROP_CYCLE_COUNT:
		ret = bq27x00_simple_value(di->cache.cycle_count, val);
		break;
	case POWER_SUPPLY_PROP_ENERGY_NOW:
		ret = bq27x00_battery_energy(di, val);
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

static void bq27x00_external_power_changed(struct power_supply *psy)
{
	struct bq27x00_device_info *di = to_bq27x00_device_info(psy);

	cancel_delayed_work_sync(&di->work);
	schedule_delayed_work(&di->work, 0);
}

/*
 * Work to record voltage and current at 1Hz.
 */
static void bq27x00_battery_debug_poll(struct work_struct *work)
{
	union power_supply_propval val;
	struct timespec ts;

	struct bq27x00_device_info *di =
		container_of(work, struct bq27x00_device_info, debug_work.work);

	mutex_lock(&di->lock);

	di->debug_index =
		(di->debug_index == DEBUG_INFO_LEN-1) ? 0 : di->debug_index+1;

	getnstimeofday(&ts);

	/* Get Voltage */
	bq27x00_battery_voltage(di, &val);
	di->debug_info[di->debug_index].voltage = val.intval;

	/* Get Current */
	bq27x00_battery_current(di, &val);
	di->debug_info[di->debug_index].avg_current = val.intval;

	di->debug_info[di->debug_index].timestamp = ts.tv_sec;

	mutex_unlock(&di->lock);

	if (di->debug_enable > 0)
		schedule_delayed_work(&di->debug_work, HZ);

	return;
}

static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
{
	int ret;

	di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
	di->bat.properties = bq27x00_battery_props;
	di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
	di->bat.get_property = bq27x00_battery_get_property;
	di->bat.external_power_changed = bq27x00_external_power_changed;

	INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
	INIT_DELAYED_WORK(&di->debug_work, bq27x00_battery_debug_poll);
	mutex_init(&di->lock);

	/*
	 * Read the battery temp now to prevent races between userspace reading
	 * properties and battery "detection" logic.
	 */
	di->cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false);
	di->cache.internal_temp = bq27x00_read(di, BQ27x00_REG_INT_TEMP, false);

	/*
	 * NOTE: Properties can be read as soon as we register the power supply.
	 */
	ret = power_supply_register(di->dev, &di->bat);
	if (ret) {
		dev_err(di->dev, "failed to register battery: %d\n", ret);
		return ret;
	}

	dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);

	bq27x00_update(di);

	return 0;
}

static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
{
	cancel_delayed_work_sync(&di->work);

	power_supply_unregister(&di->bat);

	mutex_destroy(&di->lock);
}


/* i2c specific code */
#ifdef CONFIG_BATTERY_BQ27X00_I2C

/* If the system has several batteries we need a different name for each
 * of them...
 */
static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_mutex);

static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
{
	struct i2c_client *client = to_i2c_client(di->dev);
	struct i2c_msg msg[2];
	unsigned char data[2];
	int ret;

	if (!client->adapter)
		return -ENODEV;

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].buf = &reg;
	msg[0].len = sizeof(reg);
	msg[1].addr = client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].buf = data;
	if (single)
		msg[1].len = 1;
	else
		msg[1].len = 2;

	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	if (ret < 0)
		return ret;

	if (!single)
		ret = get_unaligned_le16(data);
	else
		ret = data[0];

	return ret;
}

static int bq27x00_write_i2c(struct bq27x00_device_info *di, u8 reg, int value, bool single)
{
	struct i2c_client *client = to_i2c_client(di->dev);
	struct i2c_msg msg[2];
	unsigned char data[2];
	int ret;

	if (!client->adapter)
		return -ENODEV;

	if (!single)
		put_unaligned_le16(value, data);
	else
		data[0] = value;

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].buf = &reg;
	msg[0].len = sizeof(reg);
	msg[1].addr = client->addr;
	msg[1].flags = 0;
	msg[1].buf = data;
	if (single)
		msg[1].len = 1;
	else
		msg[1].len = 2;

	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	if (ret < 0)
		return ret;

	return 0;
}

static int bq27x00_control_cmd(struct bq27x00_device_info *di, u16 cmd)
{
	struct i2c_client *client = to_i2c_client(di->dev);
	struct i2c_msg msg[3];
	unsigned char cmd_write[3];
	unsigned char cmd_read[2];
	int ret;

	if (!client->adapter)
		return -ENODEV;

	cmd_write[0] = 0x0;
	put_unaligned_le16(cmd, cmd_write + 1);

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].buf = cmd_write;
	msg[0].len = sizeof(cmd_write);
	msg[1].addr = client->addr;
	msg[1].flags = 0;
	msg[1].buf = cmd_write;
	msg[1].len = 1;
	msg[2].addr = client->addr;
	msg[2].flags = I2C_M_RD;
	msg[2].buf = cmd_read;
	msg[2].len = sizeof(cmd_read);

	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	if (ret < 0)
		return ret;

	ret = get_unaligned_le16(cmd_read);

	return ret;
}

static int bq27x00_read_block_i2c(struct bq27x00_device_info *di, u8 reg,
		unsigned char *buf, size_t len)
{
	struct i2c_client *client = to_i2c_client(di->dev);
	struct i2c_msg msg[2];
	int ret;

	if (!client->adapter)
		return -ENODEV;

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].buf = &reg;
	msg[0].len = sizeof(reg);
	msg[1].addr = client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].buf = buf;
	msg[1].len = len;

	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	if (ret < 0)
		return ret;

	return 0;
}

static int bq27x00_battery_reset(struct bq27x00_device_info *di)
{
	dev_info(di->dev, "Gas Gauge Reset\n");

	bq27x00_write_i2c(di, CONTROL_CMD, RESET_SUBCMD, false);

	msleep(10);

	bq27x00_read_i2c(di, CONTROL_CMD, false);

	msleep(10);

	/* Reset register map based on fw version */
	bq27x00_reset_registers(di);

	return 0;
}


static int bq27x00_battery_read_fw_version(struct bq27x00_device_info *di)
{
	bq27x00_write_i2c(di, CONTROL_CMD, FW_VER_SUBCMD, false);

	msleep(10);

	return bq27x00_read_i2c(di, CONTROL_CMD, false);
}

static int bq27x00_battery_read_device_type(struct bq27x00_device_info *di)
{
	bq27x00_write_i2c(di, CONTROL_CMD, DEV_TYPE_SUBCMD, false);

	msleep(10);

	return bq27x00_read_i2c(di, CONTROL_CMD, false);
}

static int bq27x00_battery_read_dataflash_version(struct bq27x00_device_info *di)
{
	bq27x00_write_i2c(di, CONTROL_CMD, DF_VER_SUBCMD, false);

	msleep(10);

	return bq27x00_read_i2c(di, CONTROL_CMD, false);
}
#define SLAVE_LATENCY_DELAY 100

static int dump_subclass(struct bq27x00_device_info *di, u8 subclass, size_t len)
{
	int ret;
	size_t i, offset, remaining;
	unsigned char data[64];

	memset(data, 0x00, sizeof(data));

	//printk("%s: enter subclass=%02x len=%u\n", __func__, subclass, len);

	/* enable block flash control */
	ret = bq27x00_write_i2c(di, 0x61, 0x00, true);
	if (ret) {
		dev_warn(di->dev, "Failed to write (enable block flash control): %d\n", ret);
		goto error;
	}

	msleep(SLAVE_LATENCY_DELAY);

	/* set subclass */
	ret = bq27x00_write_i2c(di, 0x3e, subclass, true);
	if (ret) {
		dev_warn(di->dev, "Failed to write (set subclass 0x%02x): %d\n", subclass, ret);
		goto error;
	}

	offset = 0;
	remaining = len;

	while (remaining > 0) {
		size_t count = remaining < 32 ? remaining : 32;

		msleep(SLAVE_LATENCY_DELAY);

		/* set sebclass offset 0x00 */
		ret = bq27x00_write_i2c(di, 0x3f, offset, true);
		if (ret) {
			dev_warn(di->dev, "Failed to write (set subclass offset %d): %d\n", offset, ret);
			goto error;
		}

		msleep(SLAVE_LATENCY_DELAY);

		/* read in subclass block */
		ret = bq27x00_read_block_i2c(di, 0x40, data, count);
		if (ret) {
			dev_warn(di->dev, "Failed to read block count=%d: %d\n", count, ret);
			goto error;
		}

		printk("subclass=0x%02x len=%02u blk=%u count=%02u: ", subclass, len, offset, count);

		for (i=0; i < count; i++)
			printk("0x%02x ", data[i]);

		printk("\n");

		remaining -= count;
		offset++;
	}

	return 0;

error:
	return ret;
}

#define dump_value(name, reg_index) do { \
	int value = bq27x00_read(di, reg_index, false); \
	printk("bq27x00: %s=0x%04x\n", #name, value); \
} while(0)

static int bq27x00_dump_dataflash(struct bq27x00_device_info *di)
{
	int ret;

	printk("bq27x00: Control=0x%04x\n", bq27x00_control_cmd(di, 0x0000));
	dump_value(Temperature, BQ27x00_REG_TEMP);
	dump_value(Voltage, BQ27x00_REG_VOLT);
	dump_value(Flags, BQ27x00_REG_FLAGS);
	dump_value(NominalAvailableCapacity, BQ27x00_REG_NAC);
	dump_value(FullAvailableCapacity, BQ27500_REG_FAC);
	dump_value(RemainingCapacity, BQ27500_REG_RM);
	dump_value(FullChargeCapacity, BQ27500_REG_FCC);
	dump_value(AverageCurrent, BQ27x00_REG_AI);
	dump_value(StateOfHealth, BQ27500_REG_SOH);
	dump_value(CycleCount, BQ27500_REG_CC);
	dump_value(StateOfCharge, BQ27500_REG_SOC);
	dump_value(OperationConfiguration, BQ27500_REG_OC);

	/* unseal device */
	ret = bq27x00_write_i2c(di, 0x00, 0x0414, false);
	if (ret) {
		dev_err(di->dev, "Failed to write (unseal part 1): %d\n", ret);
		goto error;
	}

	msleep(SLAVE_LATENCY_DELAY);

	ret = bq27x00_write_i2c(di, 0x00, 0x3672, false);
	if (ret) {
		dev_err(di->dev, "Failed to write (unseal part 2): %d\n", ret);
		goto error;
	}

	msleep(SLAVE_LATENCY_DELAY);

#if 0
	ret = bq27x00_write_i2c(di, 0x00, 0xffff, false);
	if (ret) {
		dev_err(di->dev, "Failed to write (unseal part 3): %d\n", ret);
		goto error;
	}

	ret = bq27x00_write_i2c(di, 0x00, 0xffff, false);
	if (ret) {
		dev_err(di->dev, "Failed to write (unseal part 4): %d\n", ret);
		goto error;
	}
#endif

	if (di->fw_ver == G3_FW_VERSION) {
		ret = dump_subclass(di, 0x02, 9);
		ret = dump_subclass(di, 0x20, 5);
		ret = dump_subclass(di, 0x22, 9);
		ret = dump_subclass(di, 0x24, 14);
		ret = dump_subclass(di, 0x30, 26);
		ret = dump_subclass(di, 0x31, 24);
		ret = dump_subclass(di, 0x38, 9);
		ret = dump_subclass(di, 0x40, 17);
		ret = dump_subclass(di, 0x44, 16);
		ret = dump_subclass(di, 0x50, 90);
		ret = dump_subclass(di, 0x51, 13);
		ret = dump_subclass(di, 0x52, 27);
		ret = dump_subclass(di, 0x53, 45);
		ret = dump_subclass(di, 0x54, 45);
		ret = dump_subclass(di, 0x55, 65);
		ret = dump_subclass(di, 0x56, 65);
		ret = dump_subclass(di, 0x57, 19);
		ret = dump_subclass(di, 0x58, 19);
		ret = dump_subclass(di, 0x59, 19);
		ret = dump_subclass(di, 0x5a, 19);
		ret = dump_subclass(di, 0x5b, 19);
		ret = dump_subclass(di, 0x5c, 19);
		ret = dump_subclass(di, 0x5d, 19);
		ret = dump_subclass(di, 0x5e, 19);
		ret = dump_subclass(di, 0x68, 15);
		ret = dump_subclass(di, 0x69, 18);
		ret = dump_subclass(di, 0x6a, 44);
		ret = dump_subclass(di, 0x6b, 18);
		ret = dump_subclass(di, 0x6c, 19);
		ret = dump_subclass(di, 0x6d, 19);
	} else if(di->fw_ver == L1_FW_VERSION) {
		ret = dump_subclass(di, 0x02, 10);
		ret = dump_subclass(di, 0x20, 6);
		ret = dump_subclass(di, 0x22, 10);
		ret = dump_subclass(di, 0x24, 15);
		ret = dump_subclass(di, 0x30, 26);
		ret = dump_subclass(di, 0x31, 25);
		ret = dump_subclass(di, 0x38, 10);
		ret = dump_subclass(di, 0x40, 14);
		ret = dump_subclass(di, 0x44, 17);
		ret = dump_subclass(di, 0x50, 79);
		ret = dump_subclass(di, 0x51, 14);
		ret = dump_subclass(di, 0x52, 28);
		ret = dump_subclass(di, 0x53, 46);
		ret = dump_subclass(di, 0x54, 46);
		ret = dump_subclass(di, 0x55, 66);
		ret = dump_subclass(di, 0x56, 66);
		ret = dump_subclass(di, 0x57, 20);
		ret = dump_subclass(di, 0x58, 20);
		ret = dump_subclass(di, 0x59, 20);
		ret = dump_subclass(di, 0x5a, 20);
		ret = dump_subclass(di, 0x5b, 20);
		ret = dump_subclass(di, 0x5c, 20);
		ret = dump_subclass(di, 0x5d, 20);
		ret = dump_subclass(di, 0x5e, 20);
		ret = dump_subclass(di, 0x68, 16);
		ret = dump_subclass(di, 0x69, 19);
		ret = dump_subclass(di, 0x6a, 45);
		ret = dump_subclass(di, 0x6b, 19);
		ret = dump_subclass(di, 0x6c, 20);
		ret = dump_subclass(di, 0x6d, 20);
	}

#if 0
	/* seal device */
	ret = bq27x00_write_i2c(di, 0x00, 0x0020, false);
	if (ret) {
		dev_err(di->dev, "Failed to write (seal part): %d\n", ret);
		goto error;
	}
#endif

	return 0;

error:
	return ret;
}

static ssize_t show_dump_data_flash(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct bq27x00_device_info *di = dev_get_drvdata(dev);

	dev_warn(di->dev, "Dump data flash:\n");
	bq27x00_dump_dataflash(di);

	return sprintf(buf, "okay\n");
}

static ssize_t show_firmware_version(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct bq27x00_device_info *di = dev_get_drvdata(dev);
	int ver;

	ver = bq27x00_battery_read_fw_version(di);

	return sprintf(buf, "%d\n", ver);
}

static ssize_t show_dataflash_version(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct bq27x00_device_info *di = dev_get_drvdata(dev);
	int ver;

	ver = bq27x00_battery_read_dataflash_version(di);

	return sprintf(buf, "%d\n", ver);
}

static ssize_t show_device_type(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct bq27x00_device_info *di = dev_get_drvdata(dev);
	int dev_type;

	dev_type = bq27x00_battery_read_device_type(di);

	return sprintf(buf, "%d\n", dev_type);
}

static ssize_t show_reset(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct bq27x00_device_info *di = dev_get_drvdata(dev);

	bq27x00_battery_reset(di);

	return sprintf(buf, "okay\n");
}

static ssize_t show_debug_enable(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct bq27x00_device_info *di = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n",di->debug_enable);
}

static ssize_t set_debug_enable(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t count)
{
	long val;
	struct bq27x00_device_info *di = dev_get_drvdata(dev);

	if (strict_strtol(buf, 10, &val) < 0)
		return -EINVAL;

	di->debug_enable = !!val;

	if (di->debug_enable)
		schedule_delayed_work(&di->debug_work, 0);

	return count;
}

static DEVICE_ATTR(dump_data_flash, S_IRUGO, show_dump_data_flash, NULL);
static DEVICE_ATTR(fw_version, S_IRUGO, show_firmware_version, NULL);
static DEVICE_ATTR(df_version, S_IRUGO, show_dataflash_version, NULL);
static DEVICE_ATTR(device_type, S_IRUGO, show_device_type, NULL);
static DEVICE_ATTR(reset, S_IRUGO, show_reset, NULL);
static DEVICE_ATTR(debug_enable, S_IWUSR|S_IRUGO, show_debug_enable, set_debug_enable);

static struct attribute *bq27x00_attributes[] = {
	&dev_attr_dump_data_flash.attr,
	&dev_attr_fw_version.attr,
	&dev_attr_df_version.attr,
	&dev_attr_device_type.attr,
	&dev_attr_reset.attr,
	&dev_attr_debug_enable.attr,
	NULL
};

static const struct attribute_group bq27x00_attr_group = {
	.attrs = bq27x00_attributes,
};

static void bq27x00_reset_registers(struct bq27x00_device_info *di)
{
	/* Get the fw version to determine the register mapping */
	di->fw_ver = bq27x00_battery_read_fw_version(di);
	di->df_ver = bq27x00_battery_read_dataflash_version(di);
	dev_info(di->dev,
		"Gas Guage fw version 0x%04x; df version 0x%04x\n",
		di->fw_ver, di->df_ver);

	if (di->fw_ver == L1_FW_VERSION)
		di->regs = bq27x00_fw_l1_regs;
	else if (di->fw_ver == G3_FW_VERSION)
		di->regs = bq27x00_fw_g3_regs;
	else {
		dev_err(di->dev,
			"Unkown Gas Guage fw version: 0x%04x\n", di->fw_ver);
		di->regs = bq27x00_fw_g3_regs;
	}
}


static int bq27x00_battery_probe(struct i2c_client *client,
				 const struct i2c_device_id *id)
{
	char *name;
	struct bq27x00_device_info *di;
	int num;
	int retval = 0;
	struct bq27x00_platform_data *pdata = client->dev.platform_data;

	/* Get new ID for the new battery device */
	retval = idr_pre_get(&battery_id, GFP_KERNEL);
	if (retval == 0)
		return -ENOMEM;
	mutex_lock(&battery_mutex);
	retval = idr_get_new(&battery_id, client, &num);
	mutex_unlock(&battery_mutex);
	if (retval < 0)
		return retval;

	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
	if (!name) {
		dev_err(&client->dev, "failed to allocate device name\n");
		retval = -ENOMEM;
		goto batt_failed_1;
	}

	di = kzalloc(sizeof(*di), GFP_KERNEL);
	if (!di) {
		dev_err(&client->dev, "failed to allocate device info data\n");
		retval = -ENOMEM;
		goto batt_failed_2;
	}

	di->id = num;
	di->dev = &client->dev;
	di->chip = id->driver_data;
	di->bat.name = name;
	di->bus.read = &bq27x00_read_i2c;
	di->bus.write = &bq27x00_write_i2c;
	di->debug_enable = 0;

	if (pdata && pdata->translate_temp)
		di->translate_temp = pdata->translate_temp;
	else
		dev_warn(&client->dev, "fixup func not set, using default thermistor behavior\n");

	bq27x00_reset_registers(di);

	if (bq27x00_powersupply_init(di))
		goto batt_failed_3;

	i2c_set_clientdata(client, di);

	retval = sysfs_create_group(&client->dev.kobj, &bq27x00_attr_group);
	if (retval)
		dev_err(&client->dev, "could not create sysfs files\n");

	return 0;

batt_failed_3:
	kfree(di);
batt_failed_2:
	kfree(name);
batt_failed_1:
	mutex_lock(&battery_mutex);
	idr_remove(&battery_id, num);
	mutex_unlock(&battery_mutex);

	return retval;
}

static int bq27x00_battery_remove(struct i2c_client *client)
{
	struct bq27x00_device_info *di = i2c_get_clientdata(client);

	bq27x00_powersupply_unregister(di);

	kfree(di->bat.name);

	mutex_lock(&battery_mutex);
	idr_remove(&battery_id, di->id);
	mutex_unlock(&battery_mutex);

	kfree(di);

	return 0;
}

static int bq27x00_battery_suspend(struct i2c_client *client)
{
	struct bq27x00_device_info *di = i2c_get_clientdata(client);
	union power_supply_propval val;

	if (di) {
		mutex_lock(&di->lock);
		bq27x00_battery_qpassed(di,&val);
		mutex_unlock(&di->lock);
		dev_info(di->dev, "Qpassed @suspend: %d mAh\n", val.intval);
	}

	return 0;
}

static int bq27x00_battery_resume(struct i2c_client *client)
{
	struct bq27x00_device_info *di = i2c_get_clientdata(client);
	union power_supply_propval val;

	if (di) {
		mutex_lock(&di->lock);
		bq27x00_battery_qpassed(di,&val);
		mutex_unlock(&di->lock);
		dev_info(di->dev,"Qpassed @resume: %d mAh\n", val.intval);
	}

	return 0;
}


static const struct i2c_device_id bq27x00_id[] = {
	{ "bq27200", BQ27000 },	/* bq27200 is same as bq27000, but with i2c */
	{ "bq27500", BQ27500 },
	{ "bq27520", BQ27500 },
	{},
};
MODULE_DEVICE_TABLE(i2c, bq27x00_id);

static struct i2c_driver bq27x00_battery_driver = {
	.driver = {
		.name = "bq27x00-battery",
	},
	.probe = bq27x00_battery_probe,
	.remove = bq27x00_battery_remove,
	.suspend = bq27x00_battery_suspend,
	.resume = bq27x00_battery_resume,
	.id_table = bq27x00_id,
};

static inline int bq27x00_battery_i2c_init(void)
{
	int ret = i2c_add_driver(&bq27x00_battery_driver);
	if (ret)
		printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");

	return ret;
}

static inline void bq27x00_battery_i2c_exit(void)
{
	i2c_del_driver(&bq27x00_battery_driver);
}

#else

static inline int bq27x00_battery_i2c_init(void) { return 0; }
static inline void bq27x00_battery_i2c_exit(void) {};

#endif

/* platform specific code */
#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM

static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
			bool single)
{
	struct device *dev = di->dev;
	struct bq27000_platform_data *pdata = dev->platform_data;
	unsigned int timeout = 3;
	int upper, lower;
	int temp;

	if (!single) {
		/* Make sure the value has not changed in between reading the
		 * lower and the upper part */
		upper = pdata->read(dev, reg + 1);
		do {
			temp = upper;
			if (upper < 0)
				return upper;

			lower = pdata->read(dev, reg);
			if (lower < 0)
				return lower;

			upper = pdata->read(dev, reg + 1);
		} while (temp != upper && --timeout);

		if (timeout == 0)
			return -EIO;

		return (upper << 8) | lower;
	}

	return pdata->read(dev, reg);
}

static int __devinit bq27000_battery_probe(struct platform_device *pdev)
{
	struct bq27x00_device_info *di;
	struct bq27000_platform_data *pdata = pdev->dev.platform_data;
	int ret;

	if (!pdata) {
		dev_err(&pdev->dev, "no platform_data supplied\n");
		return -EINVAL;
	}

	if (!pdata->read) {
		dev_err(&pdev->dev, "no hdq read callback supplied\n");
		return -EINVAL;
	}

	di = kzalloc(sizeof(*di), GFP_KERNEL);
	if (!di) {
		dev_err(&pdev->dev, "failed to allocate device info data\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, di);

	di->dev = &pdev->dev;
	di->chip = BQ27000;

	di->bat.name = pdata->name ?: dev_name(&pdev->dev);
	di->bus.read = &bq27000_read_platform;

	ret = bq27x00_powersupply_init(di);
	if (ret)
		goto err_free;

	return 0;

err_free:
	platform_set_drvdata(pdev, NULL);
	kfree(di);

	return ret;
}

static int __devexit bq27000_battery_remove(struct platform_device *pdev)
{
	struct bq27x00_device_info *di = platform_get_drvdata(pdev);

	bq27x00_powersupply_unregister(di);

	platform_set_drvdata(pdev, NULL);
	kfree(di);

	return 0;
}

static struct platform_driver bq27000_battery_driver = {
	.probe	= bq27000_battery_probe,
	.remove = __devexit_p(bq27000_battery_remove),
	.driver = {
		.name = "bq27000-battery",
		.owner = THIS_MODULE,
	},
};

static inline int bq27x00_battery_platform_init(void)
{
	int ret = platform_driver_register(&bq27000_battery_driver);
	if (ret)
		printk(KERN_ERR "Unable to register BQ27000 platform driver\n");

	return ret;
}

static inline void bq27x00_battery_platform_exit(void)
{
	platform_driver_unregister(&bq27000_battery_driver);
}

#else

static inline int bq27x00_battery_platform_init(void) { return 0; }
static inline void bq27x00_battery_platform_exit(void) {};

#endif

/*
 * Module stuff
 */

static int __init bq27x00_battery_init(void)
{
	int ret;

	ret = bq27x00_battery_i2c_init();
	if (ret)
		return ret;

	ret = bq27x00_battery_platform_init();
	if (ret)
		bq27x00_battery_i2c_exit();

	return ret;
}
module_init(bq27x00_battery_init);

static void __exit bq27x00_battery_exit(void)
{
	bq27x00_battery_platform_exit();
	bq27x00_battery_i2c_exit();
}
module_exit(bq27x00_battery_exit);

MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
MODULE_LICENSE("GPL");