[linux-2.6-block.git] / 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>
 *
 * 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.
 *
 */
#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 <asm/unaligned.h>

#define DRIVER_VERSION			"1.1.0"

#define BQ27x00_REG_TEMP		0x06
#define BQ27x00_REG_VOLT		0x08
#define BQ27x00_REG_AI			0x14
#define BQ27x00_REG_FLAGS		0x0A

#define BQ27000_REG_RSOC		0x0B /* Relative State-of-Charge */

#define BQ27500_REG_SOC			0x2c

/* 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);

struct bq27x00_device_info;
struct bq27x00_access_methods {
	int (*read)(u8 reg, int *rt_value, int b_single,
		struct bq27x00_device_info *di);
};

enum bq27x00_chip { BQ27000, BQ27500 };

struct bq27x00_device_info {
	struct device 		*dev;
	int			id;
	struct bq27x00_access_methods	*bus;
	struct power_supply	bat;
	enum bq27x00_chip	chip;

	struct i2c_client	*client;
};

static enum power_supply_property bq27x00_battery_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_TEMP,
};

/*
 * Common code for BQ27x00 devices
 */

static int bq27x00_read(u8 reg, int *rt_value, int b_single,
			struct bq27x00_device_info *di)
{
	return di->bus->read(reg, rt_value, b_single, di);
}

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

	ret = bq27x00_read(BQ27x00_REG_TEMP, &temp, 0, di);
	if (ret) {
		dev_err(di->dev, "error reading temperature\n");
		return ret;
	}

	if (di->chip == BQ27500)
		return temp - 2731;
	else
		return ((temp >> 2) - 273) * 10;
}

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

	ret = bq27x00_read(BQ27x00_REG_VOLT, &volt, 0, di);
	if (ret) {
		dev_err(di->dev, "error reading voltage\n");
		return ret;
	}

	return volt;
}

/*
 * Return the battery average current
 * Note that current can be negative signed as well
 * Or 0 if something fails.
 */
static int bq27x00_battery_current(struct bq27x00_device_info *di)
{
	int ret;
	int curr = 0;
	int flags = 0;

	ret = bq27x00_read(BQ27x00_REG_AI, &curr, 0, di);
	if (ret) {
		dev_err(di->dev, "error reading current\n");
		return 0;
	}

	if (di->chip == BQ27500) {
		/* bq27500 returns signed value */
		curr = (int)(s16)curr;
	} else {
		ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
		if (ret < 0) {
			dev_err(di->dev, "error reading flags\n");
			return 0;
		}
		if ((flags & (1 << 7)) != 0) {
			dev_dbg(di->dev, "negative current!\n");
			return -curr;
		}
	}

	return curr;
}

/*
 * Return the battery Relative State-of-Charge
 * Or < 0 if something fails.
 */
static int bq27x00_battery_rsoc(struct bq27x00_device_info *di)
{
	int ret;
	int rsoc = 0;

	if (di->chip == BQ27500)
		ret = bq27x00_read(BQ27500_REG_SOC, &rsoc, 0, di);
	else
		ret = bq27x00_read(BQ27000_REG_RSOC, &rsoc, 1, di);
	if (ret) {
		dev_err(di->dev, "error reading relative State-of-Charge\n");
		return ret;
	}

	return rsoc;
}

#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)
{
	struct bq27x00_device_info *di = to_bq27x00_device_info(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = bq27x00_battery_voltage(di);
		if (psp == POWER_SUPPLY_PROP_PRESENT)
			val->intval = val->intval <= 0 ? 0 : 1;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		val->intval = bq27x00_battery_current(di);
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		val->intval = bq27x00_battery_rsoc(di);
		break;
	case POWER_SUPPLY_PROP_TEMP:
		val->intval = bq27x00_battery_temperature(di);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static void bq27x00_powersupply_init(struct bq27x00_device_info *di)
{
	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 = NULL;
}

/*
 * i2c specific code
 */

static int bq27x00_read_i2c(u8 reg, int *rt_value, int b_single,
			struct bq27x00_device_info *di)
{
	struct i2c_client *client = di->client;
	struct i2c_msg msg[1];
	unsigned char data[2];
	int err;

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

	msg->addr = client->addr;
	msg->flags = 0;
	msg->len = 1;
	msg->buf = data;

	data[0] = reg;
	err = i2c_transfer(client->adapter, msg, 1);

	if (err >= 0) {
		if (!b_single)
			msg->len = 2;
		else
			msg->len = 1;

		msg->flags = I2C_M_RD;
		err = i2c_transfer(client->adapter, msg, 1);
		if (err >= 0) {
			if (!b_single)
				*rt_value = get_unaligned_le16(data);
			else
				*rt_value = data[0];

			return 0;
		}
	}
	return err;
}

static int bq27x00_battery_probe(struct i2c_client *client,
				 const struct i2c_device_id *id)
{
	char *name;
	struct bq27x00_device_info *di;
	struct bq27x00_access_methods *bus;
	int num;
	int retval = 0;

	/* 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->chip = id->driver_data;

	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
	if (!bus) {
		dev_err(&client->dev, "failed to allocate access method "
					"data\n");
		retval = -ENOMEM;
		goto batt_failed_3;
	}

	i2c_set_clientdata(client, di);
	di->dev = &client->dev;
	di->bat.name = name;
	bus->read = &bq27x00_read_i2c;
	di->bus = bus;
	di->client = client;

	bq27x00_powersupply_init(di);

	retval = power_supply_register(&client->dev, &di->bat);
	if (retval) {
		dev_err(&client->dev, "failed to register battery\n");
		goto batt_failed_4;
	}

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

	return 0;

batt_failed_4:
	kfree(bus);
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);

	power_supply_unregister(&di->bat);

	kfree(di->bat.name);

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

	kfree(di);

	return 0;
}

/*
 * Module stuff
 */

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

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

static int __init bq27x00_battery_init(void)
{
	int ret;

	ret = i2c_add_driver(&bq27x00_battery_driver);
	if (ret)
		printk(KERN_ERR "Unable to register BQ27x00 driver\n");

	return ret;
}
module_init(bq27x00_battery_init);

static void __exit bq27x00_battery_exit(void)
{
	i2c_del_driver(&bq27x00_battery_driver);
}
module_exit(bq27x00_battery_exit);

MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
b996ad0e RG	1	/*
	2	* BQ27x00 battery driver
	3	*
	4	* Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
	5	* Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
	6	*
	7	* Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
	8	*
	9	* This package is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	16	*
	17	*/
	18	#include <linux/module.h>
	19	#include <linux/param.h>
	20	#include <linux/jiffies.h>
	21	#include <linux/workqueue.h>
	22	#include <linux/delay.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/power_supply.h>
	25	#include <linux/idr.h>
b996ad0e	26	#include <linux/i2c.h>
8aef7e8f	27	#include <asm/unaligned.h>
b996ad0e	28
e20908d9	29	#define DRIVER_VERSION "1.1.0"
b996ad0e RG	30
	31	#define BQ27x00_REG_TEMP 0x06
	32	#define BQ27x00_REG_VOLT 0x08
b996ad0e RG	33	#define BQ27x00_REG_AI 0x14
b996ad0e RG	34	#define BQ27x00_REG_FLAGS 0x0A
b996ad0e	35
e20908d9 GI	36	#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
	37
	38	#define BQ27500_REG_SOC 0x2c
	39
b996ad0e RG	40	/* If the system has several batteries we need a different name for each
	41	* of them...
	42	*/
	43	static DEFINE_IDR(battery_id);
	44	static DEFINE_MUTEX(battery_mutex);
	45
	46	struct bq27x00_device_info;
	47	struct bq27x00_access_methods {
	48	int (read)(u8 reg, int rt_value, int b_single,
	49	struct bq27x00_device_info *di);
	50	};
	51
e20908d9 GI	52	enum bq27x00_chip { BQ27000, BQ27500 };
e20908d9 GI	53
b996ad0e RG	54	struct bq27x00_device_info {
	55	struct device *dev;
	56	int id;
b996ad0e RG	57	struct bq27x00_access_methods *bus;
b996ad0e RG	58	struct power_supply bat;
e20908d9	59	enum bq27x00_chip chip;
b996ad0e RG	60
	61	struct i2c_client *client;
	62	};
	63
	64	static enum power_supply_property bq27x00_battery_props[] = {
	65	POWER_SUPPLY_PROP_PRESENT,
	66	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	67	POWER_SUPPLY_PROP_CURRENT_NOW,
	68	POWER_SUPPLY_PROP_CAPACITY,
	69	POWER_SUPPLY_PROP_TEMP,
	70	};
	71
	72	/*
	73	* Common code for BQ27x00 devices
	74	*/
	75
	76	static int bq27x00_read(u8 reg, int *rt_value, int b_single,
	77	struct bq27x00_device_info *di)
	78	{
97f70c23	79	return di->bus->read(reg, rt_value, b_single, di);
b996ad0e RG	80	}
	81
	82	/*
b4de3608	83	* Return the battery temperature in tenths of degree Celsius
b996ad0e RG	84	* Or < 0 if something fails.
	85	*/
	86	static int bq27x00_battery_temperature(struct bq27x00_device_info *di)
	87	{
	88	int ret;
	89	int temp = 0;
	90
	91	ret = bq27x00_read(BQ27x00_REG_TEMP, &temp, 0, di);
	92	if (ret) {
	93	dev_err(di->dev, "error reading temperature\n");
	94	return ret;
	95	}
	96
e20908d9 GI	97	if (di->chip == BQ27500)
	98	return temp - 2731;
	99	else
	100	return ((temp >> 2) - 273) * 10;
b996ad0e RG	101	}
	102
	103	/*
	104	* Return the battery Voltage in milivolts
	105	* Or < 0 if something fails.
	106	*/
	107	static int bq27x00_battery_voltage(struct bq27x00_device_info *di)
	108	{
	109	int ret;
	110	int volt = 0;
	111
	112	ret = bq27x00_read(BQ27x00_REG_VOLT, &volt, 0, di);
	113	if (ret) {
	114	dev_err(di->dev, "error reading voltage\n");
	115	return ret;
	116	}
	117
	118	return volt;
	119	}
	120
	121	/*
	122	* Return the battery average current
	123	* Note that current can be negative signed as well
	124	* Or 0 if something fails.
	125	*/
	126	static int bq27x00_battery_current(struct bq27x00_device_info *di)
	127	{
	128	int ret;
	129	int curr = 0;
	130	int flags = 0;
	131
	132	ret = bq27x00_read(BQ27x00_REG_AI, &curr, 0, di);
	133	if (ret) {
	134	dev_err(di->dev, "error reading current\n");
	135	return 0;
	136	}
e20908d9 GI	137
	138	if (di->chip == BQ27500) {
	139	/* bq27500 returns signed value */
	140	curr = (int)(s16)curr;
	141	} else {
	142	ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
	143	if (ret < 0) {
	144	dev_err(di->dev, "error reading flags\n");
	145	return 0;
	146	}
	147	if ((flags & (1 << 7)) != 0) {
	148	dev_dbg(di->dev, "negative current!\n");
	149	return -curr;
	150	}
b996ad0e	151	}
e20908d9	152
b996ad0e RG	153	return curr;
	154	}
	155
	156	/*
	157	* Return the battery Relative State-of-Charge
	158	* Or < 0 if something fails.
	159	*/
	160	static int bq27x00_battery_rsoc(struct bq27x00_device_info *di)
	161	{
	162	int ret;
	163	int rsoc = 0;
	164
e20908d9 GI	165	if (di->chip == BQ27500)
	166	ret = bq27x00_read(BQ27500_REG_SOC, &rsoc, 0, di);
	167	else
	168	ret = bq27x00_read(BQ27000_REG_RSOC, &rsoc, 1, di);
b996ad0e RG	169	if (ret) {
	170	dev_err(di->dev, "error reading relative State-of-Charge\n");
	171	return ret;
	172	}
	173
97f70c23	174	return rsoc;
b996ad0e RG	175	}
	176
	177	#define to_bq27x00_device_info(x) container_of((x), \
	178	struct bq27x00_device_info, bat);
	179
	180	static int bq27x00_battery_get_property(struct power_supply *psy,
	181	enum power_supply_property psp,
	182	union power_supply_propval *val)
	183	{
	184	struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
	185
	186	switch (psp) {
	187	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	188	case POWER_SUPPLY_PROP_PRESENT:
	189	val->intval = bq27x00_battery_voltage(di);
	190	if (psp == POWER_SUPPLY_PROP_PRESENT)
	191	val->intval = val->intval <= 0 ? 0 : 1;
	192	break;
	193	case POWER_SUPPLY_PROP_CURRENT_NOW:
	194	val->intval = bq27x00_battery_current(di);
	195	break;
	196	case POWER_SUPPLY_PROP_CAPACITY:
	197	val->intval = bq27x00_battery_rsoc(di);
	198	break;
	199	case POWER_SUPPLY_PROP_TEMP:
	200	val->intval = bq27x00_battery_temperature(di);
	201	break;
	202	default:
	203	return -EINVAL;
	204	}
	205
	206	return 0;
	207	}
	208
	209	static void bq27x00_powersupply_init(struct bq27x00_device_info *di)
	210	{
	211	di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
	212	di->bat.properties = bq27x00_battery_props;
	213	di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
	214	di->bat.get_property = bq27x00_battery_get_property;
	215	di->bat.external_power_changed = NULL;
	216	}
	217
	218	/*
e20908d9	219	* i2c specific code
b996ad0e RG	220	*/
b996ad0e RG	221
e20908d9	222	static int bq27x00_read_i2c(u8 reg, int *rt_value, int b_single,
b996ad0e RG	223	struct bq27x00_device_info *di)
	224	{
	225	struct i2c_client *client = di->client;
	226	struct i2c_msg msg[1];
	227	unsigned char data[2];
	228	int err;
	229
	230	if (!client->adapter)
	231	return -ENODEV;
	232
	233	msg->addr = client->addr;
	234	msg->flags = 0;
	235	msg->len = 1;
	236	msg->buf = data;
	237
	238	data[0] = reg;
	239	err = i2c_transfer(client->adapter, msg, 1);
	240
	241	if (err >= 0) {
	242	if (!b_single)
	243	msg->len = 2;
	244	else
	245	msg->len = 1;
	246
	247	msg->flags = I2C_M_RD;
	248	err = i2c_transfer(client->adapter, msg, 1);
	249	if (err >= 0) {
	250	if (!b_single)
97f70c23	251	*rt_value = get_unaligned_le16(data);
b996ad0e RG	252	else
	253	*rt_value = data[0];
	254
	255	return 0;
	256	}
	257	}
	258	return err;
	259	}
	260
e20908d9	261	static int bq27x00_battery_probe(struct i2c_client *client,
b996ad0e RG	262	const struct i2c_device_id *id)
	263	{
	264	char *name;
	265	struct bq27x00_device_info *di;
	266	struct bq27x00_access_methods *bus;
	267	int num;
	268	int retval = 0;
	269
	270	/* Get new ID for the new battery device */
	271	retval = idr_pre_get(&battery_id, GFP_KERNEL);
	272	if (retval == 0)
	273	return -ENOMEM;
	274	mutex_lock(&battery_mutex);
	275	retval = idr_get_new(&battery_id, client, &num);
	276	mutex_unlock(&battery_mutex);
	277	if (retval < 0)
	278	return retval;
	279
e20908d9	280	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
b996ad0e RG	281	if (!name) {
	282	dev_err(&client->dev, "failed to allocate device name\n");
	283	retval = -ENOMEM;
	284	goto batt_failed_1;
	285	}
	286
	287	di = kzalloc(sizeof(*di), GFP_KERNEL);
	288	if (!di) {
	289	dev_err(&client->dev, "failed to allocate device info data\n");
	290	retval = -ENOMEM;
	291	goto batt_failed_2;
	292	}
	293	di->id = num;
e20908d9	294	di->chip = id->driver_data;
b996ad0e RG	295
	296	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
	297	if (!bus) {
	298	dev_err(&client->dev, "failed to allocate access method "
	299	"data\n");
	300	retval = -ENOMEM;
	301	goto batt_failed_3;
	302	}
	303
	304	i2c_set_clientdata(client, di);
	305	di->dev = &client->dev;
	306	di->bat.name = name;
e20908d9	307	bus->read = &bq27x00_read_i2c;
b996ad0e RG	308	di->bus = bus;
	309	di->client = client;
	310
	311	bq27x00_powersupply_init(di);
	312
	313	retval = power_supply_register(&client->dev, &di->bat);
	314	if (retval) {
	315	dev_err(&client->dev, "failed to register battery\n");
	316	goto batt_failed_4;
	317	}
	318
	319	dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
	320
	321	return 0;
	322
	323	batt_failed_4:
	324	kfree(bus);
	325	batt_failed_3:
	326	kfree(di);
	327	batt_failed_2:
	328	kfree(name);
	329	batt_failed_1:
	330	mutex_lock(&battery_mutex);
	331	idr_remove(&battery_id, num);
	332	mutex_unlock(&battery_mutex);
	333
	334	return retval;
	335	}
	336
e20908d9	337	static int bq27x00_battery_remove(struct i2c_client *client)
b996ad0e RG	338	{
	339	struct bq27x00_device_info *di = i2c_get_clientdata(client);
	340
	341	power_supply_unregister(&di->bat);
	342
	343	kfree(di->bat.name);
	344
	345	mutex_lock(&battery_mutex);
	346	idr_remove(&battery_id, di->id);
	347	mutex_unlock(&battery_mutex);
	348
	349	kfree(di);
	350
	351	return 0;
	352	}
	353
	354	/*
	355	* Module stuff
	356	*/
	357
e20908d9 GI	358	static const struct i2c_device_id bq27x00_id[] = {
	359	{ "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
	360	{ "bq27500", BQ27500 },
b996ad0e RG	361	{},
	362	};
	363
e20908d9	364	static struct i2c_driver bq27x00_battery_driver = {
b996ad0e	365	.driver = {
e20908d9	366	.name = "bq27x00-battery",
b996ad0e	367	},
e20908d9 GI	368	.probe = bq27x00_battery_probe,
	369	.remove = bq27x00_battery_remove,
	370	.id_table = bq27x00_id,
b996ad0e RG	371	};
	372
	373	static int __init bq27x00_battery_init(void)
	374	{
	375	int ret;
	376
e20908d9	377	ret = i2c_add_driver(&bq27x00_battery_driver);
b996ad0e	378	if (ret)
e20908d9	379	printk(KERN_ERR "Unable to register BQ27x00 driver\n");
b996ad0e RG	380
	381	return ret;
	382	}
	383	module_init(bq27x00_battery_init);
	384
	385	static void __exit bq27x00_battery_exit(void)
	386	{
e20908d9	387	i2c_del_driver(&bq27x00_battery_driver);
b996ad0e RG	388	}
	389	module_exit(bq27x00_battery_exit);
	390
	391	MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
	392	MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
	393	MODULE_LICENSE("GPL");