[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 <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)(struct bq27x00_device_info *, u8 reg, int *rt_value,
			bool single);
};

enum bq27x00_chip { BQ27000, BQ27500 };

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

	struct power_supply	bat;

	struct bq27x00_access_methods bus;
};

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 inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
		int *rt_value, bool single)
{
	return di->bus.read(di, reg, rt_value, single);
}

/*
 * 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(di, BQ27x00_REG_TEMP, &temp, false);
	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(di, BQ27x00_REG_VOLT, &volt, false);
	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(di, BQ27x00_REG_AI, &curr, false);
	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(di, BQ27x00_REG_FLAGS, &flags, false);
		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(di, BQ27500_REG_SOC, &rsoc, false);
	else
		ret = bq27x00_read(di, BQ27000_REG_RSOC, &rsoc, true);
	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(di, BQ27x00_REG_FLAGS, &flags, false);
	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(di, reg, &tval, false);
	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);
	int voltage = bq27x00_battery_voltage(di);

	if (psp != POWER_SUPPLY_PROP_PRESENT && voltage <= 0)
		return -ENODEV;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = bq27x00_battery_status(di, val);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = voltage;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		if (psp == POWER_SUPPLY_PROP_PRESENT)
			val->intval = voltage <= 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 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 = NULL;

	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);

	return 0;
}

/*
 * i2c specific code
 */

static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg,
			int *rt_value, bool single)
{
	struct i2c_client *client = to_i2c_client(di->dev);
	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 (!single)
			msg->len = 2;
		else
			msg->len = 1;

		msg->flags = I2C_M_RD;
		err = i2c_transfer(client->adapter, msg, 1);
		if (err >= 0) {
			if (!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;
	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->dev = &client->dev;
	di->chip = id->driver_data;
	di->bat.name = name;
	di->bus.read = &bq27x00_read_i2c;

	if (bq27x00_powersupply_init(di))
		goto batt_failed_3;

	i2c_set_clientdata(client, di);

	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);

	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>
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 {
a40402ef LPC	57	int (read)(struct bq27x00_device_info , u8 reg, int *rt_value,
a40402ef LPC	58	bool single);
b996ad0e RG	59	};
b996ad0e RG	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;
e20908d9	66	enum bq27x00_chip chip;
b996ad0e	67
a40402ef LPC	68	struct power_supply bat;
	69
	70	struct bq27x00_access_methods bus;
b996ad0e RG	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
a40402ef LPC	90	static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
a40402ef LPC	91	int *rt_value, bool single)
b996ad0e	92	{
a40402ef	93	return di->bus.read(di, reg, rt_value, single);
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
a40402ef	105	ret = bq27x00_read(di, BQ27x00_REG_TEMP, &temp, false);
b996ad0e RG	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
a40402ef	126	ret = bq27x00_read(di, BQ27x00_REG_VOLT, &volt, false);
b996ad0e RG	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
a40402ef	146	ret = bq27x00_read(di, BQ27x00_REG_AI, &curr, false);
b996ad0e RG	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	155	} else {
a40402ef	156	ret = bq27x00_read(di, BQ27x00_REG_FLAGS, &flags, false);
e20908d9 GI	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	180	if (di->chip == BQ27500)
a40402ef	181	ret = bq27x00_read(di, BQ27500_REG_SOC, &rsoc, false);
e20908d9	182	else
a40402ef	183	ret = bq27x00_read(di, BQ27000_REG_RSOC, &rsoc, true);
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
a40402ef	199	ret = bq27x00_read(di, BQ27x00_REG_FLAGS, &flags, false);
4e924a81 GI	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
a40402ef	233	ret = bq27x00_read(di, reg, &tval, false);
4e924a81 GI	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	254	struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
3413b4ea LPC	255	int voltage = bq27x00_battery_voltage(di);
	256
	257	if (psp != POWER_SUPPLY_PROP_PRESENT && voltage <= 0)
	258	return -ENODEV;
b996ad0e RG	259
b996ad0e RG	260	switch (psp) {
4e924a81 GI	261	case POWER_SUPPLY_PROP_STATUS:
	262	ret = bq27x00_battery_status(di, val);
	263	break;
b996ad0e	264	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
3413b4ea LPC	265	val->intval = voltage;
3413b4ea LPC	266	break;
b996ad0e	267	case POWER_SUPPLY_PROP_PRESENT:
b996ad0e	268	if (psp == POWER_SUPPLY_PROP_PRESENT)
3413b4ea	269	val->intval = voltage <= 0 ? 0 : 1;
b996ad0e RG	270	break;
	271	case POWER_SUPPLY_PROP_CURRENT_NOW:
	272	val->intval = bq27x00_battery_current(di);
	273	break;
	274	case POWER_SUPPLY_PROP_CAPACITY:
	275	val->intval = bq27x00_battery_rsoc(di);
	276	break;
	277	case POWER_SUPPLY_PROP_TEMP:
	278	val->intval = bq27x00_battery_temperature(di);
	279	break;
4e924a81 GI	280	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
	281	ret = bq27x00_battery_time(di, BQ27x00_REG_TTE, val);
	282	break;
	283	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
	284	ret = bq27x00_battery_time(di, BQ27x00_REG_TTECP, val);
	285	break;
	286	case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
	287	ret = bq27x00_battery_time(di, BQ27x00_REG_TTF, val);
	288	break;
5661f334 LPC	289	case POWER_SUPPLY_PROP_TECHNOLOGY:
	290	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	291	break;
b996ad0e RG	292	default:
	293	return -EINVAL;
	294	}
	295
4e924a81	296	return ret;
b996ad0e RG	297	}
b996ad0e RG	298
a40402ef	299	static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
b996ad0e	300	{
a40402ef LPC	301	int ret;
a40402ef LPC	302
b996ad0e RG	303	di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
	304	di->bat.properties = bq27x00_battery_props;
	305	di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
	306	di->bat.get_property = bq27x00_battery_get_property;
	307	di->bat.external_power_changed = NULL;
a40402ef LPC	308
	309	ret = power_supply_register(di->dev, &di->bat);
	310	if (ret) {
	311	dev_err(di->dev, "failed to register battery: %d\n", ret);
	312	return ret;
	313	}
	314
	315	dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
	316
	317	return 0;
b996ad0e RG	318	}
	319
	320	/*
e20908d9	321	* i2c specific code
b996ad0e RG	322	*/
b996ad0e RG	323
a40402ef LPC	324	static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg,
a40402ef LPC	325	int *rt_value, bool single)
b996ad0e	326	{
a40402ef	327	struct i2c_client *client = to_i2c_client(di->dev);
b996ad0e RG	328	struct i2c_msg msg[1];
	329	unsigned char data[2];
	330	int err;
	331
	332	if (!client->adapter)
	333	return -ENODEV;
	334
	335	msg->addr = client->addr;
	336	msg->flags = 0;
	337	msg->len = 1;
	338	msg->buf = data;
	339
	340	data[0] = reg;
	341	err = i2c_transfer(client->adapter, msg, 1);
	342
	343	if (err >= 0) {
a40402ef	344	if (!single)
b996ad0e RG	345	msg->len = 2;
	346	else
	347	msg->len = 1;
	348
	349	msg->flags = I2C_M_RD;
	350	err = i2c_transfer(client->adapter, msg, 1);
	351	if (err >= 0) {
a40402ef	352	if (!single)
97f70c23	353	*rt_value = get_unaligned_le16(data);
b996ad0e RG	354	else
	355	*rt_value = data[0];
	356
	357	return 0;
	358	}
	359	}
	360	return err;
	361	}
	362
e20908d9	363	static int bq27x00_battery_probe(struct i2c_client *client,
b996ad0e RG	364	const struct i2c_device_id *id)
	365	{
	366	char *name;
	367	struct bq27x00_device_info *di;
b996ad0e RG	368	int num;
	369	int retval = 0;
	370
	371	/* Get new ID for the new battery device */
	372	retval = idr_pre_get(&battery_id, GFP_KERNEL);
	373	if (retval == 0)
	374	return -ENOMEM;
	375	mutex_lock(&battery_mutex);
	376	retval = idr_get_new(&battery_id, client, &num);
	377	mutex_unlock(&battery_mutex);
	378	if (retval < 0)
	379	return retval;
	380
e20908d9	381	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
b996ad0e RG	382	if (!name) {
	383	dev_err(&client->dev, "failed to allocate device name\n");
	384	retval = -ENOMEM;
	385	goto batt_failed_1;
	386	}
	387
	388	di = kzalloc(sizeof(*di), GFP_KERNEL);
	389	if (!di) {
	390	dev_err(&client->dev, "failed to allocate device info data\n");
	391	retval = -ENOMEM;
	392	goto batt_failed_2;
	393	}
a40402ef	394
b996ad0e	395	di->id = num;
a40402ef	396	di->dev = &client->dev;
e20908d9	397	di->chip = id->driver_data;
a40402ef LPC	398	di->bat.name = name;
a40402ef LPC	399	di->bus.read = &bq27x00_read_i2c;
b996ad0e	400
a40402ef	401	if (bq27x00_powersupply_init(di))
b996ad0e	402	goto batt_failed_3;
b996ad0e RG	403
b996ad0e RG	404	i2c_set_clientdata(client, di);
b996ad0e RG	405
	406	return 0;
	407
b996ad0e RG	408	batt_failed_3:
	409	kfree(di);
	410	batt_failed_2:
	411	kfree(name);
	412	batt_failed_1:
	413	mutex_lock(&battery_mutex);
	414	idr_remove(&battery_id, num);
	415	mutex_unlock(&battery_mutex);
	416
	417	return retval;
	418	}
	419
e20908d9	420	static int bq27x00_battery_remove(struct i2c_client *client)
b996ad0e RG	421	{
	422	struct bq27x00_device_info *di = i2c_get_clientdata(client);
	423
	424	power_supply_unregister(&di->bat);
	425
	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");