[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)

#define BQ27000_RS			20 /* Resistor sense */

/* 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) * 1000;
	} 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;
		}
		curr = curr * 3570 / BQ27000_RS;
	}

	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;
}

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
a2e5118c PR	47	#define BQ27000_RS 20 /* Resistor sense */
a2e5118c PR	48
b996ad0e RG	49	/* If the system has several batteries we need a different name for each
	50	* of them...
	51	*/
	52	static DEFINE_IDR(battery_id);
	53	static DEFINE_MUTEX(battery_mutex);
	54
	55	struct bq27x00_device_info;
	56	struct bq27x00_access_methods {
	57	int (read)(u8 reg, int rt_value, int b_single,
	58	struct bq27x00_device_info *di);
	59	};
	60
e20908d9 GI	61	enum bq27x00_chip { BQ27000, BQ27500 };
e20908d9 GI	62
b996ad0e RG	63	struct bq27x00_device_info {
	64	struct device *dev;
	65	int id;
b996ad0e RG	66	struct bq27x00_access_methods *bus;
b996ad0e RG	67	struct power_supply bat;
e20908d9	68	enum bq27x00_chip chip;
b996ad0e RG	69
	70	struct i2c_client *client;
	71	};
	72
	73	static enum power_supply_property bq27x00_battery_props[] = {
4e924a81	74	POWER_SUPPLY_PROP_STATUS,
b996ad0e RG	75	POWER_SUPPLY_PROP_PRESENT,
	76	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	77	POWER_SUPPLY_PROP_CURRENT_NOW,
	78	POWER_SUPPLY_PROP_CAPACITY,
	79	POWER_SUPPLY_PROP_TEMP,
4e924a81 GI	80	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	81	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
	82	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
5661f334	83	POWER_SUPPLY_PROP_TECHNOLOGY,
b996ad0e RG	84	};
	85
	86	/*
	87	* Common code for BQ27x00 devices
	88	*/
	89
	90	static int bq27x00_read(u8 reg, int *rt_value, int b_single,
	91	struct bq27x00_device_info *di)
	92	{
97f70c23	93	return di->bus->read(reg, rt_value, b_single, di);
b996ad0e RG	94	}
	95
	96	/*
b4de3608	97	* Return the battery temperature in tenths of degree Celsius
b996ad0e RG	98	* Or < 0 if something fails.
	99	*/
	100	static int bq27x00_battery_temperature(struct bq27x00_device_info *di)
	101	{
	102	int ret;
	103	int temp = 0;
	104
	105	ret = bq27x00_read(BQ27x00_REG_TEMP, &temp, 0, di);
	106	if (ret) {
	107	dev_err(di->dev, "error reading temperature\n");
	108	return ret;
	109	}
	110
e20908d9 GI	111	if (di->chip == BQ27500)
	112	return temp - 2731;
	113	else
0e9f3049	114	return ((temp * 5) - 5463) / 2;
b996ad0e RG	115	}
	116
	117	/*
	118	* Return the battery Voltage in milivolts
	119	* Or < 0 if something fails.
	120	*/
	121	static int bq27x00_battery_voltage(struct bq27x00_device_info *di)
	122	{
	123	int ret;
	124	int volt = 0;
	125
	126	ret = bq27x00_read(BQ27x00_REG_VOLT, &volt, 0, di);
	127	if (ret) {
	128	dev_err(di->dev, "error reading voltage\n");
	129	return ret;
	130	}
	131
afbc74fd	132	return volt * 1000;
b996ad0e RG	133	}
	134
	135	/*
	136	* Return the battery average current
	137	* Note that current can be negative signed as well
	138	* Or 0 if something fails.
	139	*/
	140	static int bq27x00_battery_current(struct bq27x00_device_info *di)
	141	{
	142	int ret;
	143	int curr = 0;
	144	int flags = 0;
	145
	146	ret = bq27x00_read(BQ27x00_REG_AI, &curr, 0, di);
	147	if (ret) {
	148	dev_err(di->dev, "error reading current\n");
	149	return 0;
	150	}
e20908d9 GI	151
	152	if (di->chip == BQ27500) {
	153	/* bq27500 returns signed value */
a2e5118c	154	curr = (int)((s16)curr) * 1000;
e20908d9 GI	155	} else {
	156	ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
	157	if (ret < 0) {
	158	dev_err(di->dev, "error reading flags\n");
	159	return 0;
	160	}
4e924a81	161	if (flags & BQ27000_FLAG_CHGS) {
e20908d9	162	dev_dbg(di->dev, "negative current!\n");
afbc74fd	163	curr = -curr;
e20908d9	164	}
a2e5118c	165	curr = curr * 3570 / BQ27000_RS;
b996ad0e	166	}
e20908d9	167
a2e5118c	168	return curr;
b996ad0e RG	169	}
	170
	171	/*
	172	* Return the battery Relative State-of-Charge
	173	* Or < 0 if something fails.
	174	*/
	175	static int bq27x00_battery_rsoc(struct bq27x00_device_info *di)
	176	{
	177	int ret;
	178	int rsoc = 0;
	179
e20908d9 GI	180	if (di->chip == BQ27500)
	181	ret = bq27x00_read(BQ27500_REG_SOC, &rsoc, 0, di);
	182	else
	183	ret = bq27x00_read(BQ27000_REG_RSOC, &rsoc, 1, di);
b996ad0e RG	184	if (ret) {
	185	dev_err(di->dev, "error reading relative State-of-Charge\n");
	186	return ret;
	187	}
	188
97f70c23	189	return rsoc;
b996ad0e RG	190	}
b996ad0e RG	191
4e924a81 GI	192	static int bq27x00_battery_status(struct bq27x00_device_info *di,
	193	union power_supply_propval *val)
	194	{
	195	int flags = 0;
	196	int status;
	197	int ret;
	198
	199	ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
	200	if (ret < 0) {
	201	dev_err(di->dev, "error reading flags\n");
	202	return ret;
	203	}
	204
	205	if (di->chip == BQ27500) {
	206	if (flags & BQ27500_FLAG_FC)
	207	status = POWER_SUPPLY_STATUS_FULL;
	208	else if (flags & BQ27500_FLAG_DSC)
	209	status = POWER_SUPPLY_STATUS_DISCHARGING;
	210	else
	211	status = POWER_SUPPLY_STATUS_CHARGING;
	212	} else {
	213	if (flags & BQ27000_FLAG_CHGS)
	214	status = POWER_SUPPLY_STATUS_CHARGING;
	215	else
	216	status = POWER_SUPPLY_STATUS_DISCHARGING;
	217	}
	218
	219	val->intval = status;
	220	return 0;
	221	}
	222
	223	/*
	224	* Read a time register.
	225	* Return < 0 if something fails.
	226	*/
	227	static int bq27x00_battery_time(struct bq27x00_device_info *di, int reg,
	228	union power_supply_propval *val)
	229	{
	230	int tval = 0;
	231	int ret;
	232
	233	ret = bq27x00_read(reg, &tval, 0, di);
	234	if (ret) {
	235	dev_err(di->dev, "error reading register %02x\n", reg);
	236	return ret;
	237	}
	238
	239	if (tval == 65535)
	240	return -ENODATA;
	241
	242	val->intval = tval * 60;
	243	return 0;
	244	}
	245
b996ad0e RG	246	#define to_bq27x00_device_info(x) container_of((x), \
	247	struct bq27x00_device_info, bat);
	248
	249	static int bq27x00_battery_get_property(struct power_supply *psy,
	250	enum power_supply_property psp,
	251	union power_supply_propval *val)
	252	{
4e924a81	253	int ret = 0;
b996ad0e RG	254	struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
	255
	256	switch (psp) {
4e924a81 GI	257	case POWER_SUPPLY_PROP_STATUS:
	258	ret = bq27x00_battery_status(di, val);
	259	break;
b996ad0e RG	260	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	261	case POWER_SUPPLY_PROP_PRESENT:
	262	val->intval = bq27x00_battery_voltage(di);
	263	if (psp == POWER_SUPPLY_PROP_PRESENT)
	264	val->intval = val->intval <= 0 ? 0 : 1;
	265	break;
	266	case POWER_SUPPLY_PROP_CURRENT_NOW:
	267	val->intval = bq27x00_battery_current(di);
	268	break;
	269	case POWER_SUPPLY_PROP_CAPACITY:
	270	val->intval = bq27x00_battery_rsoc(di);
	271	break;
	272	case POWER_SUPPLY_PROP_TEMP:
	273	val->intval = bq27x00_battery_temperature(di);
	274	break;
4e924a81 GI	275	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
	276	ret = bq27x00_battery_time(di, BQ27x00_REG_TTE, val);
	277	break;
	278	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
	279	ret = bq27x00_battery_time(di, BQ27x00_REG_TTECP, val);
	280	break;
	281	case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
	282	ret = bq27x00_battery_time(di, BQ27x00_REG_TTF, val);
	283	break;
5661f334 LPC	284	case POWER_SUPPLY_PROP_TECHNOLOGY:
	285	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	286	break;
b996ad0e RG	287	default:
	288	return -EINVAL;
	289	}
	290
4e924a81	291	return ret;
b996ad0e RG	292	}
	293
	294	static void bq27x00_powersupply_init(struct bq27x00_device_info *di)
	295	{
	296	di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
	297	di->bat.properties = bq27x00_battery_props;
	298	di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
	299	di->bat.get_property = bq27x00_battery_get_property;
	300	di->bat.external_power_changed = NULL;
	301	}
	302
	303	/*
e20908d9	304	* i2c specific code
b996ad0e RG	305	*/
b996ad0e RG	306
e20908d9	307	static int bq27x00_read_i2c(u8 reg, int *rt_value, int b_single,
b996ad0e RG	308	struct bq27x00_device_info *di)
	309	{
	310	struct i2c_client *client = di->client;
	311	struct i2c_msg msg[1];
	312	unsigned char data[2];
	313	int err;
	314
	315	if (!client->adapter)
	316	return -ENODEV;
	317
	318	msg->addr = client->addr;
	319	msg->flags = 0;
	320	msg->len = 1;
	321	msg->buf = data;
	322
	323	data[0] = reg;
	324	err = i2c_transfer(client->adapter, msg, 1);
	325
	326	if (err >= 0) {
	327	if (!b_single)
	328	msg->len = 2;
	329	else
	330	msg->len = 1;
	331
	332	msg->flags = I2C_M_RD;
	333	err = i2c_transfer(client->adapter, msg, 1);
	334	if (err >= 0) {
	335	if (!b_single)
97f70c23	336	*rt_value = get_unaligned_le16(data);
b996ad0e RG	337	else
	338	*rt_value = data[0];
	339
	340	return 0;
	341	}
	342	}
	343	return err;
	344	}
	345
e20908d9	346	static int bq27x00_battery_probe(struct i2c_client *client,
b996ad0e RG	347	const struct i2c_device_id *id)
	348	{
	349	char *name;
	350	struct bq27x00_device_info *di;
	351	struct bq27x00_access_methods *bus;
	352	int num;
	353	int retval = 0;
	354
	355	/* Get new ID for the new battery device */
	356	retval = idr_pre_get(&battery_id, GFP_KERNEL);
	357	if (retval == 0)
	358	return -ENOMEM;
	359	mutex_lock(&battery_mutex);
	360	retval = idr_get_new(&battery_id, client, &num);
	361	mutex_unlock(&battery_mutex);
	362	if (retval < 0)
	363	return retval;
	364
e20908d9	365	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
b996ad0e RG	366	if (!name) {
	367	dev_err(&client->dev, "failed to allocate device name\n");
	368	retval = -ENOMEM;
	369	goto batt_failed_1;
	370	}
	371
	372	di = kzalloc(sizeof(*di), GFP_KERNEL);
	373	if (!di) {
	374	dev_err(&client->dev, "failed to allocate device info data\n");
	375	retval = -ENOMEM;
	376	goto batt_failed_2;
	377	}
	378	di->id = num;
e20908d9	379	di->chip = id->driver_data;
b996ad0e RG	380
	381	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
	382	if (!bus) {
	383	dev_err(&client->dev, "failed to allocate access method "
	384	"data\n");
	385	retval = -ENOMEM;
	386	goto batt_failed_3;
	387	}
	388
	389	i2c_set_clientdata(client, di);
	390	di->dev = &client->dev;
	391	di->bat.name = name;
e20908d9	392	bus->read = &bq27x00_read_i2c;
b996ad0e RG	393	di->bus = bus;
	394	di->client = client;
	395
	396	bq27x00_powersupply_init(di);
	397
	398	retval = power_supply_register(&client->dev, &di->bat);
	399	if (retval) {
	400	dev_err(&client->dev, "failed to register battery\n");
	401	goto batt_failed_4;
	402	}
	403
	404	dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
	405
	406	return 0;
	407
	408	batt_failed_4:
	409	kfree(bus);
	410	batt_failed_3:
	411	kfree(di);
	412	batt_failed_2:
	413	kfree(name);
	414	batt_failed_1:
	415	mutex_lock(&battery_mutex);
	416	idr_remove(&battery_id, num);
	417	mutex_unlock(&battery_mutex);
	418
	419	return retval;
	420	}
	421
e20908d9	422	static int bq27x00_battery_remove(struct i2c_client *client)
b996ad0e RG	423	{
	424	struct bq27x00_device_info *di = i2c_get_clientdata(client);
	425
	426	power_supply_unregister(&di->bat);
	427
9292585c	428	kfree(di->bus);
b996ad0e RG	429	kfree(di->bat.name);
	430
	431	mutex_lock(&battery_mutex);
	432	idr_remove(&battery_id, di->id);
	433	mutex_unlock(&battery_mutex);
	434
	435	kfree(di);
	436
	437	return 0;
	438	}
	439
	440	/*
	441	* Module stuff
	442	*/
	443
e20908d9 GI	444	static const struct i2c_device_id bq27x00_id[] = {
	445	{ "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
	446	{ "bq27500", BQ27500 },
b996ad0e RG	447	{},
	448	};
	449
e20908d9	450	static struct i2c_driver bq27x00_battery_driver = {
b996ad0e	451	.driver = {
e20908d9	452	.name = "bq27x00-battery",
b996ad0e	453	},
e20908d9 GI	454	.probe = bq27x00_battery_probe,
	455	.remove = bq27x00_battery_remove,
	456	.id_table = bq27x00_id,
b996ad0e RG	457	};
	458
	459	static int __init bq27x00_battery_init(void)
	460	{
	461	int ret;
	462
e20908d9	463	ret = i2c_add_driver(&bq27x00_battery_driver);
b996ad0e	464	if (ret)
e20908d9	465	printk(KERN_ERR "Unable to register BQ27x00 driver\n");
b996ad0e RG	466
	467	return ret;
	468	}
	469	module_init(bq27x00_battery_init);
	470
	471	static void __exit bq27x00_battery_exit(void)
	472	{
e20908d9	473	i2c_del_driver(&bq27x00_battery_driver);
b996ad0e RG	474	}
	475	module_exit(bq27x00_battery_exit);
	476
	477	MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
	478	MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
	479	MODULE_LICENSE("GPL");