[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 <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,
};

/*
 * 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 * 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;
	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->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
4e924a81 GI	35	#define BQ27x00_REG_TTE 0x16
	36	#define BQ27x00_REG_TTF 0x18
	37	#define BQ27x00_REG_TTECP 0x26
b996ad0e	38
e20908d9	39	#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
4e924a81	40	#define BQ27000_FLAG_CHGS BIT(7)
e20908d9 GI	41
e20908d9 GI	42	#define BQ27500_REG_SOC 0x2c
4e924a81 GI	43	#define BQ27500_FLAG_DSC BIT(0)
4e924a81 GI	44	#define BQ27500_FLAG_FC BIT(9)
e20908d9	45
b996ad0e RG	46	/* If the system has several batteries we need a different name for each
	47	* of them...
	48	*/
	49	static DEFINE_IDR(battery_id);
	50	static DEFINE_MUTEX(battery_mutex);
	51
	52	struct bq27x00_device_info;
	53	struct bq27x00_access_methods {
	54	int (read)(u8 reg, int rt_value, int b_single,
	55	struct bq27x00_device_info *di);
	56	};
	57
e20908d9 GI	58	enum bq27x00_chip { BQ27000, BQ27500 };
e20908d9 GI	59
b996ad0e RG	60	struct bq27x00_device_info {
	61	struct device *dev;
	62	int id;
b996ad0e RG	63	struct bq27x00_access_methods *bus;
b996ad0e RG	64	struct power_supply bat;
e20908d9	65	enum bq27x00_chip chip;
b996ad0e RG	66
	67	struct i2c_client *client;
	68	};
	69
	70	static enum power_supply_property bq27x00_battery_props[] = {
4e924a81	71	POWER_SUPPLY_PROP_STATUS,
b996ad0e RG	72	POWER_SUPPLY_PROP_PRESENT,
	73	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	74	POWER_SUPPLY_PROP_CURRENT_NOW,
	75	POWER_SUPPLY_PROP_CAPACITY,
	76	POWER_SUPPLY_PROP_TEMP,
4e924a81 GI	77	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	78	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
	79	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
b996ad0e RG	80	};
	81
	82	/*
	83	* Common code for BQ27x00 devices
	84	*/
	85
	86	static int bq27x00_read(u8 reg, int *rt_value, int b_single,
	87	struct bq27x00_device_info *di)
	88	{
97f70c23	89	return di->bus->read(reg, rt_value, b_single, di);
b996ad0e RG	90	}
	91
	92	/*
b4de3608	93	* Return the battery temperature in tenths of degree Celsius
b996ad0e RG	94	* Or < 0 if something fails.
	95	*/
	96	static int bq27x00_battery_temperature(struct bq27x00_device_info *di)
	97	{
	98	int ret;
	99	int temp = 0;
	100
	101	ret = bq27x00_read(BQ27x00_REG_TEMP, &temp, 0, di);
	102	if (ret) {
	103	dev_err(di->dev, "error reading temperature\n");
	104	return ret;
	105	}
	106
e20908d9 GI	107	if (di->chip == BQ27500)
	108	return temp - 2731;
	109	else
	110	return ((temp >> 2) - 273) * 10;
b996ad0e RG	111	}
	112
	113	/*
	114	* Return the battery Voltage in milivolts
	115	* Or < 0 if something fails.
	116	*/
	117	static int bq27x00_battery_voltage(struct bq27x00_device_info *di)
	118	{
	119	int ret;
	120	int volt = 0;
	121
	122	ret = bq27x00_read(BQ27x00_REG_VOLT, &volt, 0, di);
	123	if (ret) {
	124	dev_err(di->dev, "error reading voltage\n");
	125	return ret;
	126	}
	127
afbc74fd	128	return volt * 1000;
b996ad0e RG	129	}
	130
	131	/*
	132	* Return the battery average current
	133	* Note that current can be negative signed as well
	134	* Or 0 if something fails.
	135	*/
	136	static int bq27x00_battery_current(struct bq27x00_device_info *di)
	137	{
	138	int ret;
	139	int curr = 0;
	140	int flags = 0;
	141
	142	ret = bq27x00_read(BQ27x00_REG_AI, &curr, 0, di);
	143	if (ret) {
	144	dev_err(di->dev, "error reading current\n");
	145	return 0;
	146	}
e20908d9 GI	147
	148	if (di->chip == BQ27500) {
	149	/* bq27500 returns signed value */
	150	curr = (int)(s16)curr;
	151	} else {
	152	ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
	153	if (ret < 0) {
	154	dev_err(di->dev, "error reading flags\n");
	155	return 0;
	156	}
4e924a81	157	if (flags & BQ27000_FLAG_CHGS) {
e20908d9	158	dev_dbg(di->dev, "negative current!\n");
afbc74fd	159	curr = -curr;
e20908d9	160	}
b996ad0e	161	}
e20908d9	162
afbc74fd	163	return curr * 1000;
b996ad0e RG	164	}
	165
	166	/*
	167	* Return the battery Relative State-of-Charge
	168	* Or < 0 if something fails.
	169	*/
	170	static int bq27x00_battery_rsoc(struct bq27x00_device_info *di)
	171	{
	172	int ret;
	173	int rsoc = 0;
	174
e20908d9 GI	175	if (di->chip == BQ27500)
	176	ret = bq27x00_read(BQ27500_REG_SOC, &rsoc, 0, di);
	177	else
	178	ret = bq27x00_read(BQ27000_REG_RSOC, &rsoc, 1, di);
b996ad0e RG	179	if (ret) {
	180	dev_err(di->dev, "error reading relative State-of-Charge\n");
	181	return ret;
	182	}
	183
97f70c23	184	return rsoc;
b996ad0e RG	185	}
b996ad0e RG	186
4e924a81 GI	187	static int bq27x00_battery_status(struct bq27x00_device_info *di,
	188	union power_supply_propval *val)
	189	{
	190	int flags = 0;
	191	int status;
	192	int ret;
	193
	194	ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
	195	if (ret < 0) {
	196	dev_err(di->dev, "error reading flags\n");
	197	return ret;
	198	}
	199
	200	if (di->chip == BQ27500) {
	201	if (flags & BQ27500_FLAG_FC)
	202	status = POWER_SUPPLY_STATUS_FULL;
	203	else if (flags & BQ27500_FLAG_DSC)
	204	status = POWER_SUPPLY_STATUS_DISCHARGING;
	205	else
	206	status = POWER_SUPPLY_STATUS_CHARGING;
	207	} else {
	208	if (flags & BQ27000_FLAG_CHGS)
	209	status = POWER_SUPPLY_STATUS_CHARGING;
	210	else
	211	status = POWER_SUPPLY_STATUS_DISCHARGING;
	212	}
	213
	214	val->intval = status;
	215	return 0;
	216	}
	217
	218	/*
	219	* Read a time register.
	220	* Return < 0 if something fails.
	221	*/
	222	static int bq27x00_battery_time(struct bq27x00_device_info *di, int reg,
	223	union power_supply_propval *val)
	224	{
	225	int tval = 0;
	226	int ret;
	227
	228	ret = bq27x00_read(reg, &tval, 0, di);
	229	if (ret) {
	230	dev_err(di->dev, "error reading register %02x\n", reg);
	231	return ret;
	232	}
	233
	234	if (tval == 65535)
	235	return -ENODATA;
	236
	237	val->intval = tval * 60;
	238	return 0;
	239	}
	240
b996ad0e RG	241	#define to_bq27x00_device_info(x) container_of((x), \
	242	struct bq27x00_device_info, bat);
	243
	244	static int bq27x00_battery_get_property(struct power_supply *psy,
	245	enum power_supply_property psp,
	246	union power_supply_propval *val)
	247	{
4e924a81	248	int ret = 0;
b996ad0e RG	249	struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
	250
	251	switch (psp) {
4e924a81 GI	252	case POWER_SUPPLY_PROP_STATUS:
	253	ret = bq27x00_battery_status(di, val);
	254	break;
b996ad0e RG	255	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	256	case POWER_SUPPLY_PROP_PRESENT:
	257	val->intval = bq27x00_battery_voltage(di);
	258	if (psp == POWER_SUPPLY_PROP_PRESENT)
	259	val->intval = val->intval <= 0 ? 0 : 1;
	260	break;
	261	case POWER_SUPPLY_PROP_CURRENT_NOW:
	262	val->intval = bq27x00_battery_current(di);
	263	break;
	264	case POWER_SUPPLY_PROP_CAPACITY:
	265	val->intval = bq27x00_battery_rsoc(di);
	266	break;
	267	case POWER_SUPPLY_PROP_TEMP:
	268	val->intval = bq27x00_battery_temperature(di);
	269	break;
4e924a81 GI	270	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
	271	ret = bq27x00_battery_time(di, BQ27x00_REG_TTE, val);
	272	break;
	273	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
	274	ret = bq27x00_battery_time(di, BQ27x00_REG_TTECP, val);
	275	break;
	276	case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
	277	ret = bq27x00_battery_time(di, BQ27x00_REG_TTF, val);
	278	break;
b996ad0e RG	279	default:
	280	return -EINVAL;
	281	}
	282
4e924a81	283	return ret;
b996ad0e RG	284	}
	285
	286	static void bq27x00_powersupply_init(struct bq27x00_device_info *di)
	287	{
	288	di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
	289	di->bat.properties = bq27x00_battery_props;
	290	di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
	291	di->bat.get_property = bq27x00_battery_get_property;
	292	di->bat.external_power_changed = NULL;
	293	}
	294
	295	/*
e20908d9	296	* i2c specific code
b996ad0e RG	297	*/
b996ad0e RG	298
e20908d9	299	static int bq27x00_read_i2c(u8 reg, int *rt_value, int b_single,
b996ad0e RG	300	struct bq27x00_device_info *di)
	301	{
	302	struct i2c_client *client = di->client;
	303	struct i2c_msg msg[1];
	304	unsigned char data[2];
	305	int err;
	306
	307	if (!client->adapter)
	308	return -ENODEV;
	309
	310	msg->addr = client->addr;
	311	msg->flags = 0;
	312	msg->len = 1;
	313	msg->buf = data;
	314
	315	data[0] = reg;
	316	err = i2c_transfer(client->adapter, msg, 1);
	317
	318	if (err >= 0) {
	319	if (!b_single)
	320	msg->len = 2;
	321	else
	322	msg->len = 1;
	323
	324	msg->flags = I2C_M_RD;
	325	err = i2c_transfer(client->adapter, msg, 1);
	326	if (err >= 0) {
	327	if (!b_single)
97f70c23	328	*rt_value = get_unaligned_le16(data);
b996ad0e RG	329	else
	330	*rt_value = data[0];
	331
	332	return 0;
	333	}
	334	}
	335	return err;
	336	}
	337
e20908d9	338	static int bq27x00_battery_probe(struct i2c_client *client,
b996ad0e RG	339	const struct i2c_device_id *id)
	340	{
	341	char *name;
	342	struct bq27x00_device_info *di;
	343	struct bq27x00_access_methods *bus;
	344	int num;
	345	int retval = 0;
	346
	347	/* Get new ID for the new battery device */
	348	retval = idr_pre_get(&battery_id, GFP_KERNEL);
	349	if (retval == 0)
	350	return -ENOMEM;
	351	mutex_lock(&battery_mutex);
	352	retval = idr_get_new(&battery_id, client, &num);
	353	mutex_unlock(&battery_mutex);
	354	if (retval < 0)
	355	return retval;
	356
e20908d9	357	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
b996ad0e RG	358	if (!name) {
	359	dev_err(&client->dev, "failed to allocate device name\n");
	360	retval = -ENOMEM;
	361	goto batt_failed_1;
	362	}
	363
	364	di = kzalloc(sizeof(*di), GFP_KERNEL);
	365	if (!di) {
	366	dev_err(&client->dev, "failed to allocate device info data\n");
	367	retval = -ENOMEM;
	368	goto batt_failed_2;
	369	}
	370	di->id = num;
e20908d9	371	di->chip = id->driver_data;
b996ad0e RG	372
	373	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
	374	if (!bus) {
	375	dev_err(&client->dev, "failed to allocate access method "
	376	"data\n");
	377	retval = -ENOMEM;
	378	goto batt_failed_3;
	379	}
	380
	381	i2c_set_clientdata(client, di);
	382	di->dev = &client->dev;
	383	di->bat.name = name;
e20908d9	384	bus->read = &bq27x00_read_i2c;
b996ad0e RG	385	di->bus = bus;
	386	di->client = client;
	387
	388	bq27x00_powersupply_init(di);
	389
	390	retval = power_supply_register(&client->dev, &di->bat);
	391	if (retval) {
	392	dev_err(&client->dev, "failed to register battery\n");
	393	goto batt_failed_4;
	394	}
	395
	396	dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
	397
	398	return 0;
	399
	400	batt_failed_4:
	401	kfree(bus);
	402	batt_failed_3:
	403	kfree(di);
	404	batt_failed_2:
	405	kfree(name);
	406	batt_failed_1:
	407	mutex_lock(&battery_mutex);
	408	idr_remove(&battery_id, num);
	409	mutex_unlock(&battery_mutex);
	410
	411	return retval;
	412	}
	413
e20908d9	414	static int bq27x00_battery_remove(struct i2c_client *client)
b996ad0e RG	415	{
	416	struct bq27x00_device_info *di = i2c_get_clientdata(client);
	417
	418	power_supply_unregister(&di->bat);
	419
	420	kfree(di->bat.name);
	421
	422	mutex_lock(&battery_mutex);
	423	idr_remove(&battery_id, di->id);
	424	mutex_unlock(&battery_mutex);
	425
	426	kfree(di);
	427
	428	return 0;
	429	}
	430
	431	/*
	432	* Module stuff
	433	*/
	434
e20908d9 GI	435	static const struct i2c_device_id bq27x00_id[] = {
	436	{ "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
	437	{ "bq27500", BQ27500 },
b996ad0e RG	438	{},
	439	};
	440
e20908d9	441	static struct i2c_driver bq27x00_battery_driver = {
b996ad0e	442	.driver = {
e20908d9	443	.name = "bq27x00-battery",
b996ad0e	444	},
e20908d9 GI	445	.probe = bq27x00_battery_probe,
	446	.remove = bq27x00_battery_remove,
	447	.id_table = bq27x00_id,
b996ad0e RG	448	};
	449
	450	static int __init bq27x00_battery_init(void)
	451	{
	452	int ret;
	453
e20908d9	454	ret = i2c_add_driver(&bq27x00_battery_driver);
b996ad0e	455	if (ret)
e20908d9	456	printk(KERN_ERR "Unable to register BQ27x00 driver\n");
b996ad0e RG	457
	458	return ret;
	459	}
	460	module_init(bq27x00_battery_init);
	461
	462	static void __exit bq27x00_battery_exit(void)
	463	{
e20908d9	464	i2c_del_driver(&bq27x00_battery_driver);
b996ad0e RG	465	}
	466	module_exit(bq27x00_battery_exit);
	467
	468	MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
	469	MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
	470	MODULE_LICENSE("GPL");