[net-next-2.6.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,
};

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