[deliverable/linux.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 <linux/slab.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 BQ27x00_REG_TTE			0x16
#define BQ27x00_REG_TTF			0x18
#define BQ27x00_REG_TTECP		0x26

#define BQ27000_REG_RSOC		0x0B /* Relative State-of-Charge */
#define BQ27000_FLAG_CHGS		BIT(7)

#define BQ27500_REG_SOC			0x2c
#define BQ27500_FLAG_DSC		BIT(0)
#define BQ27500_FLAG_FC			BIT(9)

/* 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_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,
};

/*
 * 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 * 5) - 5463) / 2;
}

/*
 * 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 * 1000;
}

/*
 * 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 & BQ27000_FLAG_CHGS) {
			dev_dbg(di->dev, "negative current!\n");
			curr = -curr;
		}
	}

	return curr * 1000;
}

/*
 * 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;
}

static int bq27x00_battery_status(struct bq27x00_device_info *di,
				  union power_supply_propval *val)
{
	int flags = 0;
	int status;
	int ret;

	ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
	if (ret < 0) {
		dev_err(di->dev, "error reading flags\n");
		return ret;
	}

	if (di->chip == BQ27500) {
		if (flags & BQ27500_FLAG_FC)
			status = POWER_SUPPLY_STATUS_FULL;
		else if (flags & BQ27500_FLAG_DSC)
			status = POWER_SUPPLY_STATUS_DISCHARGING;
		else
			status = POWER_SUPPLY_STATUS_CHARGING;
	} else {
		if (flags & BQ27000_FLAG_CHGS)
			status = POWER_SUPPLY_STATUS_CHARGING;
		else
			status = POWER_SUPPLY_STATUS_DISCHARGING;
	}

	val->intval = status;
	return 0;
}

/*
 * Read a time register.
 * Return < 0 if something fails.
 */
static int bq27x00_battery_time(struct bq27x00_device_info *di, int reg,
				union power_supply_propval *val)
{
	int tval = 0;
	int ret;

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

	if (tval == 65535)
		return -ENODATA;

	val->intval = tval * 60;
	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);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = bq27x00_battery_status(di, val);
		break;
	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;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
		ret = bq27x00_battery_time(di, BQ27x00_REG_TTE, val);
		break;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
		ret = bq27x00_battery_time(di, BQ27x00_REG_TTECP, val);
		break;
	case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
		ret = bq27x00_battery_time(di, BQ27x00_REG_TTF, val);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

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->bus);
	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>
5a0e3ad6	27	#include <linux/slab.h>
8aef7e8f	28	#include <asm/unaligned.h>
b996ad0e	29
e20908d9	30	#define DRIVER_VERSION "1.1.0"
b996ad0e RG	31
	32	#define BQ27x00_REG_TEMP 0x06
	33	#define BQ27x00_REG_VOLT 0x08
b996ad0e RG	34	#define BQ27x00_REG_AI 0x14
b996ad0e RG	35	#define BQ27x00_REG_FLAGS 0x0A
4e924a81 GI	36	#define BQ27x00_REG_TTE 0x16
	37	#define BQ27x00_REG_TTF 0x18
	38	#define BQ27x00_REG_TTECP 0x26
b996ad0e	39
e20908d9	40	#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
4e924a81	41	#define BQ27000_FLAG_CHGS BIT(7)
e20908d9 GI	42
e20908d9 GI	43	#define BQ27500_REG_SOC 0x2c
4e924a81 GI	44	#define BQ27500_FLAG_DSC BIT(0)
4e924a81 GI	45	#define BQ27500_FLAG_FC BIT(9)
e20908d9	46
b996ad0e RG	47	/* If the system has several batteries we need a different name for each
	48	* of them...
	49	*/
	50	static DEFINE_IDR(battery_id);
	51	static DEFINE_MUTEX(battery_mutex);
	52
	53	struct bq27x00_device_info;
	54	struct bq27x00_access_methods {
	55	int (read)(u8 reg, int rt_value, int b_single,
	56	struct bq27x00_device_info *di);
	57	};
	58
e20908d9 GI	59	enum bq27x00_chip { BQ27000, BQ27500 };
e20908d9 GI	60
b996ad0e RG	61	struct bq27x00_device_info {
	62	struct device *dev;
	63	int id;
b996ad0e RG	64	struct bq27x00_access_methods *bus;
b996ad0e RG	65	struct power_supply bat;
e20908d9	66	enum bq27x00_chip chip;
b996ad0e RG	67
	68	struct i2c_client *client;
	69	};
	70
	71	static enum power_supply_property bq27x00_battery_props[] = {
4e924a81	72	POWER_SUPPLY_PROP_STATUS,
b996ad0e RG	73	POWER_SUPPLY_PROP_PRESENT,
	74	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	75	POWER_SUPPLY_PROP_CURRENT_NOW,
	76	POWER_SUPPLY_PROP_CAPACITY,
	77	POWER_SUPPLY_PROP_TEMP,
4e924a81 GI	78	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	79	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
	80	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
5661f334	81	POWER_SUPPLY_PROP_TECHNOLOGY,
b996ad0e RG	82	};
	83
	84	/*
	85	* Common code for BQ27x00 devices
	86	*/
	87
	88	static int bq27x00_read(u8 reg, int *rt_value, int b_single,
	89	struct bq27x00_device_info *di)
	90	{
97f70c23	91	return di->bus->read(reg, rt_value, b_single, di);
b996ad0e RG	92	}
	93
	94	/*
b4de3608	95	* Return the battery temperature in tenths of degree Celsius
b996ad0e RG	96	* Or < 0 if something fails.
	97	*/
	98	static int bq27x00_battery_temperature(struct bq27x00_device_info *di)
	99	{
	100	int ret;
	101	int temp = 0;
	102
	103	ret = bq27x00_read(BQ27x00_REG_TEMP, &temp, 0, di);
	104	if (ret) {
	105	dev_err(di->dev, "error reading temperature\n");
	106	return ret;
	107	}
	108
e20908d9 GI	109	if (di->chip == BQ27500)
	110	return temp - 2731;
	111	else
0e9f3049	112	return ((temp * 5) - 5463) / 2;
b996ad0e RG	113	}
	114
	115	/*
	116	* Return the battery Voltage in milivolts
	117	* Or < 0 if something fails.
	118	*/
	119	static int bq27x00_battery_voltage(struct bq27x00_device_info *di)
	120	{
	121	int ret;
	122	int volt = 0;
	123
	124	ret = bq27x00_read(BQ27x00_REG_VOLT, &volt, 0, di);
	125	if (ret) {
	126	dev_err(di->dev, "error reading voltage\n");
	127	return ret;
	128	}
	129
afbc74fd	130	return volt * 1000;
b996ad0e RG	131	}
	132
	133	/*
	134	* Return the battery average current
	135	* Note that current can be negative signed as well
	136	* Or 0 if something fails.
	137	*/
	138	static int bq27x00_battery_current(struct bq27x00_device_info *di)
	139	{
	140	int ret;
	141	int curr = 0;
	142	int flags = 0;
	143
	144	ret = bq27x00_read(BQ27x00_REG_AI, &curr, 0, di);
	145	if (ret) {
	146	dev_err(di->dev, "error reading current\n");
	147	return 0;
	148	}
e20908d9 GI	149
	150	if (di->chip == BQ27500) {
	151	/* bq27500 returns signed value */
	152	curr = (int)(s16)curr;
	153	} else {
	154	ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
	155	if (ret < 0) {
	156	dev_err(di->dev, "error reading flags\n");
	157	return 0;
	158	}
4e924a81	159	if (flags & BQ27000_FLAG_CHGS) {
e20908d9	160	dev_dbg(di->dev, "negative current!\n");
afbc74fd	161	curr = -curr;
e20908d9	162	}
b996ad0e	163	}
e20908d9	164
afbc74fd	165	return curr * 1000;
b996ad0e RG	166	}
	167
	168	/*
	169	* Return the battery Relative State-of-Charge
	170	* Or < 0 if something fails.
	171	*/
	172	static int bq27x00_battery_rsoc(struct bq27x00_device_info *di)
	173	{
	174	int ret;
	175	int rsoc = 0;
	176
e20908d9 GI	177	if (di->chip == BQ27500)
	178	ret = bq27x00_read(BQ27500_REG_SOC, &rsoc, 0, di);
	179	else
	180	ret = bq27x00_read(BQ27000_REG_RSOC, &rsoc, 1, di);
b996ad0e RG	181	if (ret) {
	182	dev_err(di->dev, "error reading relative State-of-Charge\n");
	183	return ret;
	184	}
	185
97f70c23	186	return rsoc;
b996ad0e RG	187	}
b996ad0e RG	188
4e924a81 GI	189	static int bq27x00_battery_status(struct bq27x00_device_info *di,
	190	union power_supply_propval *val)
	191	{
	192	int flags = 0;
	193	int status;
	194	int ret;
	195
	196	ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
	197	if (ret < 0) {
	198	dev_err(di->dev, "error reading flags\n");
	199	return ret;
	200	}
	201
	202	if (di->chip == BQ27500) {
	203	if (flags & BQ27500_FLAG_FC)
	204	status = POWER_SUPPLY_STATUS_FULL;
	205	else if (flags & BQ27500_FLAG_DSC)
	206	status = POWER_SUPPLY_STATUS_DISCHARGING;
	207	else
	208	status = POWER_SUPPLY_STATUS_CHARGING;
	209	} else {
	210	if (flags & BQ27000_FLAG_CHGS)
	211	status = POWER_SUPPLY_STATUS_CHARGING;
	212	else
	213	status = POWER_SUPPLY_STATUS_DISCHARGING;
	214	}
	215
	216	val->intval = status;
	217	return 0;
	218	}
	219
	220	/*
	221	* Read a time register.
	222	* Return < 0 if something fails.
	223	*/
	224	static int bq27x00_battery_time(struct bq27x00_device_info *di, int reg,
	225	union power_supply_propval *val)
	226	{
	227	int tval = 0;
	228	int ret;
	229
	230	ret = bq27x00_read(reg, &tval, 0, di);
	231	if (ret) {
	232	dev_err(di->dev, "error reading register %02x\n", reg);
	233	return ret;
	234	}
	235
	236	if (tval == 65535)
	237	return -ENODATA;
	238
	239	val->intval = tval * 60;
	240	return 0;
	241	}
	242
b996ad0e RG	243	#define to_bq27x00_device_info(x) container_of((x), \
	244	struct bq27x00_device_info, bat);
	245
	246	static int bq27x00_battery_get_property(struct power_supply *psy,
	247	enum power_supply_property psp,
	248	union power_supply_propval *val)
	249	{
4e924a81	250	int ret = 0;
b996ad0e RG	251	struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
	252
	253	switch (psp) {
4e924a81 GI	254	case POWER_SUPPLY_PROP_STATUS:
	255	ret = bq27x00_battery_status(di, val);
	256	break;
b996ad0e RG	257	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	258	case POWER_SUPPLY_PROP_PRESENT:
	259	val->intval = bq27x00_battery_voltage(di);
	260	if (psp == POWER_SUPPLY_PROP_PRESENT)
	261	val->intval = val->intval <= 0 ? 0 : 1;
	262	break;
	263	case POWER_SUPPLY_PROP_CURRENT_NOW:
	264	val->intval = bq27x00_battery_current(di);
	265	break;
	266	case POWER_SUPPLY_PROP_CAPACITY:
	267	val->intval = bq27x00_battery_rsoc(di);
	268	break;
	269	case POWER_SUPPLY_PROP_TEMP:
	270	val->intval = bq27x00_battery_temperature(di);
	271	break;
4e924a81 GI	272	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
	273	ret = bq27x00_battery_time(di, BQ27x00_REG_TTE, val);
	274	break;
	275	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
	276	ret = bq27x00_battery_time(di, BQ27x00_REG_TTECP, val);
	277	break;
	278	case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
	279	ret = bq27x00_battery_time(di, BQ27x00_REG_TTF, val);
	280	break;
5661f334 LPC	281	case POWER_SUPPLY_PROP_TECHNOLOGY:
	282	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	283	break;
b996ad0e RG	284	default:
	285	return -EINVAL;
	286	}
	287
4e924a81	288	return ret;
b996ad0e RG	289	}
	290
	291	static void bq27x00_powersupply_init(struct bq27x00_device_info *di)
	292	{
	293	di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
	294	di->bat.properties = bq27x00_battery_props;
	295	di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
	296	di->bat.get_property = bq27x00_battery_get_property;
	297	di->bat.external_power_changed = NULL;
	298	}
	299
	300	/*
e20908d9	301	* i2c specific code
b996ad0e RG	302	*/
b996ad0e RG	303
e20908d9	304	static int bq27x00_read_i2c(u8 reg, int *rt_value, int b_single,
b996ad0e RG	305	struct bq27x00_device_info *di)
	306	{
	307	struct i2c_client *client = di->client;
	308	struct i2c_msg msg[1];
	309	unsigned char data[2];
	310	int err;
	311
	312	if (!client->adapter)
	313	return -ENODEV;
	314
	315	msg->addr = client->addr;
	316	msg->flags = 0;
	317	msg->len = 1;
	318	msg->buf = data;
	319
	320	data[0] = reg;
	321	err = i2c_transfer(client->adapter, msg, 1);
	322
	323	if (err >= 0) {
	324	if (!b_single)
	325	msg->len = 2;
	326	else
	327	msg->len = 1;
	328
	329	msg->flags = I2C_M_RD;
	330	err = i2c_transfer(client->adapter, msg, 1);
	331	if (err >= 0) {
	332	if (!b_single)
97f70c23	333	*rt_value = get_unaligned_le16(data);
b996ad0e RG	334	else
	335	*rt_value = data[0];
	336
	337	return 0;
	338	}
	339	}
	340	return err;
	341	}
	342
e20908d9	343	static int bq27x00_battery_probe(struct i2c_client *client,
b996ad0e RG	344	const struct i2c_device_id *id)
	345	{
	346	char *name;
	347	struct bq27x00_device_info *di;
	348	struct bq27x00_access_methods *bus;
	349	int num;
	350	int retval = 0;
	351
	352	/* Get new ID for the new battery device */
	353	retval = idr_pre_get(&battery_id, GFP_KERNEL);
	354	if (retval == 0)
	355	return -ENOMEM;
	356	mutex_lock(&battery_mutex);
	357	retval = idr_get_new(&battery_id, client, &num);
	358	mutex_unlock(&battery_mutex);
	359	if (retval < 0)
	360	return retval;
	361
e20908d9	362	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
b996ad0e RG	363	if (!name) {
	364	dev_err(&client->dev, "failed to allocate device name\n");
	365	retval = -ENOMEM;
	366	goto batt_failed_1;
	367	}
	368
	369	di = kzalloc(sizeof(*di), GFP_KERNEL);
	370	if (!di) {
	371	dev_err(&client->dev, "failed to allocate device info data\n");
	372	retval = -ENOMEM;
	373	goto batt_failed_2;
	374	}
	375	di->id = num;
e20908d9	376	di->chip = id->driver_data;
b996ad0e RG	377
	378	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
	379	if (!bus) {
	380	dev_err(&client->dev, "failed to allocate access method "
	381	"data\n");
	382	retval = -ENOMEM;
	383	goto batt_failed_3;
	384	}
	385
	386	i2c_set_clientdata(client, di);
	387	di->dev = &client->dev;
	388	di->bat.name = name;
e20908d9	389	bus->read = &bq27x00_read_i2c;
b996ad0e RG	390	di->bus = bus;
	391	di->client = client;
	392
	393	bq27x00_powersupply_init(di);
	394
	395	retval = power_supply_register(&client->dev, &di->bat);
	396	if (retval) {
	397	dev_err(&client->dev, "failed to register battery\n");
	398	goto batt_failed_4;
	399	}
	400
	401	dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
	402
	403	return 0;
	404
	405	batt_failed_4:
	406	kfree(bus);
	407	batt_failed_3:
	408	kfree(di);
	409	batt_failed_2:
	410	kfree(name);
	411	batt_failed_1:
	412	mutex_lock(&battery_mutex);
	413	idr_remove(&battery_id, num);
	414	mutex_unlock(&battery_mutex);
	415
	416	return retval;
	417	}
	418
e20908d9	419	static int bq27x00_battery_remove(struct i2c_client *client)
b996ad0e RG	420	{
	421	struct bq27x00_device_info *di = i2c_get_clientdata(client);
	422
	423	power_supply_unregister(&di->bat);
	424
9292585c	425	kfree(di->bus);
b996ad0e RG	426	kfree(di->bat.name);
	427
	428	mutex_lock(&battery_mutex);
	429	idr_remove(&battery_id, di->id);
	430	mutex_unlock(&battery_mutex);
	431
	432	kfree(di);
	433
	434	return 0;
	435	}
	436
	437	/*
	438	* Module stuff
	439	*/
	440
e20908d9 GI	441	static const struct i2c_device_id bq27x00_id[] = {
	442	{ "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
	443	{ "bq27500", BQ27500 },
b996ad0e RG	444	{},
	445	};
	446
e20908d9	447	static struct i2c_driver bq27x00_battery_driver = {
b996ad0e	448	.driver = {
e20908d9	449	.name = "bq27x00-battery",
b996ad0e	450	},
e20908d9 GI	451	.probe = bq27x00_battery_probe,
	452	.remove = bq27x00_battery_remove,
	453	.id_table = bq27x00_id,
b996ad0e RG	454	};
	455
	456	static int __init bq27x00_battery_init(void)
	457	{
	458	int ret;
	459
e20908d9	460	ret = i2c_add_driver(&bq27x00_battery_driver);
b996ad0e	461	if (ret)
e20908d9	462	printk(KERN_ERR "Unable to register BQ27x00 driver\n");
b996ad0e RG	463
	464	return ret;
	465	}
	466	module_init(bq27x00_battery_init);
	467
	468	static void __exit bq27x00_battery_exit(void)
	469	{
e20908d9	470	i2c_del_driver(&bq27x00_battery_driver);
b996ad0e RG	471	}
	472	module_exit(bq27x00_battery_exit);
	473
	474	MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
	475	MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
	476	MODULE_LICENSE("GPL");