[linux-2.6-block.git] / drivers / power / ds2782_battery.c

/*
 * I2C client/driver for the Maxim/Dallas DS2782 Stand-Alone Fuel Gauge IC
 *
 * Copyright (C) 2009 Bluewater Systems Ltd
 *
 * Author: Ryan Mallon
 *
 * DS2786 added by Yulia Vilensky <vilensky@compulab.co.il>
 *
 * UEvent sending added by Evgeny Romanov <romanov@neurosoft.ru>
 *
 * This program 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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/swab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/idr.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/ds2782_battery.h>

#define DS2782_REG_RARC		0x06	/* Remaining active relative capacity */

#define DS278x_REG_VOLT_MSB	0x0c
#define DS278x_REG_TEMP_MSB	0x0a
#define DS278x_REG_CURRENT_MSB	0x0e

/* EEPROM Block */
#define DS2782_REG_RSNSP	0x69	/* Sense resistor value */

/* Current unit measurement in uA for a 1 milli-ohm sense resistor */
#define DS2782_CURRENT_UNITS	1563

#define DS2786_REG_RARC		0x02	/* Remaining active relative capacity */

#define DS2786_CURRENT_UNITS	25

#define DS278x_DELAY		1000

struct ds278x_info;

struct ds278x_battery_ops {
	int (*get_battery_current)(struct ds278x_info *info, int *current_uA);
	int (*get_battery_voltage)(struct ds278x_info *info, int *voltage_uV);
	int (*get_battery_capacity)(struct ds278x_info *info, int *capacity);
};

#define to_ds278x_info(x) power_supply_get_drvdata(x)

struct ds278x_info {
	struct i2c_client	*client;
	struct power_supply	*battery;
	struct power_supply_desc	battery_desc;
	const struct ds278x_battery_ops *ops;
	struct delayed_work	bat_work;
	int			id;
	int                     rsns;
	int			capacity;
	int			status;		/* State Of Charge */
};

static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_lock);

static inline int ds278x_read_reg(struct ds278x_info *info, int reg, u8 *val)
{
	int ret;

	ret = i2c_smbus_read_byte_data(info->client, reg);
	if (ret < 0) {
		dev_err(&info->client->dev, "register read failed\n");
		return ret;
	}

	*val = ret;
	return 0;
}

static inline int ds278x_read_reg16(struct ds278x_info *info, int reg_msb,
				    s16 *val)
{
	int ret;

	ret = i2c_smbus_read_word_data(info->client, reg_msb);
	if (ret < 0) {
		dev_err(&info->client->dev, "register read failed\n");
		return ret;
	}

	*val = swab16(ret);
	return 0;
}

static int ds278x_get_temp(struct ds278x_info *info, int *temp)
{
	s16 raw;
	int err;

	/*
	 * Temperature is measured in units of 0.125 degrees celcius, the
	 * power_supply class measures temperature in tenths of degrees
	 * celsius. The temperature value is stored as a 10 bit number, plus
	 * sign in the upper bits of a 16 bit register.
	 */
	err = ds278x_read_reg16(info, DS278x_REG_TEMP_MSB, &raw);
	if (err)
		return err;
	*temp = ((raw / 32) * 125) / 100;
	return 0;
}

static int ds2782_get_current(struct ds278x_info *info, int *current_uA)
{
	int sense_res;
	int err;
	u8 sense_res_raw;
	s16 raw;

	/*
	 * The units of measurement for current are dependent on the value of
	 * the sense resistor.
	 */
	err = ds278x_read_reg(info, DS2782_REG_RSNSP, &sense_res_raw);
	if (err)
		return err;
	if (sense_res_raw == 0) {
		dev_err(&info->client->dev, "sense resistor value is 0\n");
		return -ENXIO;
	}
	sense_res = 1000 / sense_res_raw;

	dev_dbg(&info->client->dev, "sense resistor = %d milli-ohms\n",
		sense_res);
	err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);
	if (err)
		return err;
	*current_uA = raw * (DS2782_CURRENT_UNITS / sense_res);
	return 0;
}

static int ds2782_get_voltage(struct ds278x_info *info, int *voltage_uV)
{
	s16 raw;
	int err;

	/*
	 * Voltage is measured in units of 4.88mV. The voltage is stored as
	 * a 10-bit number plus sign, in the upper bits of a 16-bit register
	 */
	err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);
	if (err)
		return err;
	*voltage_uV = (raw / 32) * 4800;
	return 0;
}

static int ds2782_get_capacity(struct ds278x_info *info, int *capacity)
{
	int err;
	u8 raw;

	err = ds278x_read_reg(info, DS2782_REG_RARC, &raw);
	if (err)
		return err;
	*capacity = raw;
	return 0;
}

static int ds2786_get_current(struct ds278x_info *info, int *current_uA)
{
	int err;
	s16 raw;

	err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);
	if (err)
		return err;
	*current_uA = (raw / 16) * (DS2786_CURRENT_UNITS / info->rsns);
	return 0;
}

static int ds2786_get_voltage(struct ds278x_info *info, int *voltage_uV)
{
	s16 raw;
	int err;

	/*
	 * Voltage is measured in units of 1.22mV. The voltage is stored as
	 * a 12-bit number plus sign, in the upper bits of a 16-bit register
	 */
	err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);
	if (err)
		return err;
	*voltage_uV = (raw / 8) * 1220;
	return 0;
}

static int ds2786_get_capacity(struct ds278x_info *info, int *capacity)
{
	int err;
	u8 raw;

	err = ds278x_read_reg(info, DS2786_REG_RARC, &raw);
	if (err)
		return err;
	/* Relative capacity is displayed with resolution 0.5 % */
	*capacity = raw/2 ;
	return 0;
}

static int ds278x_get_status(struct ds278x_info *info, int *status)
{
	int err;
	int current_uA;
	int capacity;

	err = info->ops->get_battery_current(info, &current_uA);
	if (err)
		return err;

	err = info->ops->get_battery_capacity(info, &capacity);
	if (err)
		return err;

	info->capacity = capacity;

	if (capacity == 100)
		*status = POWER_SUPPLY_STATUS_FULL;
	else if (current_uA == 0)
		*status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	else if (current_uA < 0)
		*status = POWER_SUPPLY_STATUS_DISCHARGING;
	else
		*status = POWER_SUPPLY_STATUS_CHARGING;

	return 0;
}

static int ds278x_battery_get_property(struct power_supply *psy,
				       enum power_supply_property prop,
				       union power_supply_propval *val)
{
	struct ds278x_info *info = to_ds278x_info(psy);
	int ret;

	switch (prop) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = ds278x_get_status(info, &val->intval);
		break;

	case POWER_SUPPLY_PROP_CAPACITY:
		ret = info->ops->get_battery_capacity(info, &val->intval);
		break;

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = info->ops->get_battery_voltage(info, &val->intval);
		break;

	case POWER_SUPPLY_PROP_CURRENT_NOW:
		ret = info->ops->get_battery_current(info, &val->intval);
		break;

	case POWER_SUPPLY_PROP_TEMP:
		ret = ds278x_get_temp(info, &val->intval);
		break;

	default:
		ret = -EINVAL;
	}

	return ret;
}

static void ds278x_bat_update(struct ds278x_info *info)
{
	int old_status = info->status;
	int old_capacity = info->capacity;

	ds278x_get_status(info, &info->status);

	if ((old_status != info->status) || (old_capacity != info->capacity))
		power_supply_changed(info->battery);
}

static void ds278x_bat_work(struct work_struct *work)
{
	struct ds278x_info *info;

	info = container_of(work, struct ds278x_info, bat_work.work);
	ds278x_bat_update(info);

	schedule_delayed_work(&info->bat_work, DS278x_DELAY);
}

static enum power_supply_property ds278x_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_TEMP,
};

static void ds278x_power_supply_init(struct power_supply_desc *battery)
{
	battery->type			= POWER_SUPPLY_TYPE_BATTERY;
	battery->properties		= ds278x_battery_props;
	battery->num_properties		= ARRAY_SIZE(ds278x_battery_props);
	battery->get_property		= ds278x_battery_get_property;
	battery->external_power_changed	= NULL;
}

static int ds278x_battery_remove(struct i2c_client *client)
{
	struct ds278x_info *info = i2c_get_clientdata(client);

	power_supply_unregister(info->battery);
	kfree(info->battery_desc.name);

	mutex_lock(&battery_lock);
	idr_remove(&battery_id, info->id);
	mutex_unlock(&battery_lock);

	cancel_delayed_work(&info->bat_work);

	kfree(info);
	return 0;
}

#ifdef CONFIG_PM_SLEEP

static int ds278x_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ds278x_info *info = i2c_get_clientdata(client);

	cancel_delayed_work(&info->bat_work);
	return 0;
}

static int ds278x_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ds278x_info *info = i2c_get_clientdata(client);

	schedule_delayed_work(&info->bat_work, DS278x_DELAY);
	return 0;
}
#endif /* CONFIG_PM_SLEEP */

static SIMPLE_DEV_PM_OPS(ds278x_battery_pm_ops, ds278x_suspend, ds278x_resume);

enum ds278x_num_id {
	DS2782 = 0,
	DS2786,
};

static const struct ds278x_battery_ops ds278x_ops[] = {
	[DS2782] = {
		.get_battery_current  = ds2782_get_current,
		.get_battery_voltage  = ds2782_get_voltage,
		.get_battery_capacity = ds2782_get_capacity,
	},
	[DS2786] = {
		.get_battery_current  = ds2786_get_current,
		.get_battery_voltage  = ds2786_get_voltage,
		.get_battery_capacity = ds2786_get_capacity,
	}
};

static int ds278x_battery_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct ds278x_platform_data *pdata = client->dev.platform_data;
	struct power_supply_config psy_cfg = {};
	struct ds278x_info *info;
	int ret;
	int num;

	/*
	 * ds2786 should have the sense resistor value set
	 * in the platform data
	 */
	if (id->driver_data == DS2786 && !pdata) {
		dev_err(&client->dev, "missing platform data for ds2786\n");
		return -EINVAL;
	}

	/* Get an ID for this battery */
	mutex_lock(&battery_lock);
	ret = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
	mutex_unlock(&battery_lock);
	if (ret < 0)
		goto fail_id;
	num = ret;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		ret = -ENOMEM;
		goto fail_info;
	}

	info->battery_desc.name = kasprintf(GFP_KERNEL, "%s-%d",
					    client->name, num);
	if (!info->battery_desc.name) {
		ret = -ENOMEM;
		goto fail_name;
	}

	if (id->driver_data == DS2786)
		info->rsns = pdata->rsns;

	i2c_set_clientdata(client, info);
	info->client = client;
	info->id = num;
	info->ops  = &ds278x_ops[id->driver_data];
	ds278x_power_supply_init(&info->battery_desc);
	psy_cfg.drv_data = info;

	info->capacity = 100;
	info->status = POWER_SUPPLY_STATUS_FULL;

	INIT_DELAYED_WORK(&info->bat_work, ds278x_bat_work);

	info->battery = power_supply_register(&client->dev,
					      &info->battery_desc, &psy_cfg);
	if (IS_ERR(info->battery)) {
		dev_err(&client->dev, "failed to register battery\n");
		ret = PTR_ERR(info->battery);
		goto fail_register;
	} else {
		schedule_delayed_work(&info->bat_work, DS278x_DELAY);
	}

	return 0;

fail_register:
	kfree(info->battery_desc.name);
fail_name:
	kfree(info);
fail_info:
	mutex_lock(&battery_lock);
	idr_remove(&battery_id, num);
	mutex_unlock(&battery_lock);
fail_id:
	return ret;
}

static const struct i2c_device_id ds278x_id[] = {
	{"ds2782", DS2782},
	{"ds2786", DS2786},
	{},
};
MODULE_DEVICE_TABLE(i2c, ds278x_id);

static struct i2c_driver ds278x_battery_driver = {
	.driver 	= {
		.name	= "ds2782-battery",
		.pm	= &ds278x_battery_pm_ops,
	},
	.probe		= ds278x_battery_probe,
	.remove		= ds278x_battery_remove,
	.id_table	= ds278x_id,
};
module_i2c_driver(ds278x_battery_driver);

MODULE_AUTHOR("Ryan Mallon");
MODULE_DESCRIPTION("Maxim/Dallas DS2782 Stand-Alone Fuel Gauage IC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
bfdb46ce RM	1	/*
	2	* I2C client/driver for the Maxim/Dallas DS2782 Stand-Alone Fuel Gauge IC
	3	*
	4	* Copyright (C) 2009 Bluewater Systems Ltd
	5	*
1c5454ee	6	* Author: Ryan Mallon
bfdb46ce	7	*
9b9ade6b YV	8	* DS2786 added by Yulia Vilensky <vilensky@compulab.co.il>
9b9ade6b YV	9	*
7cee9aef ER	10	* UEvent sending added by Evgeny Romanov <romanov@neurosoft.ru>
7cee9aef ER	11	*
bfdb46ce RM	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/types.h>
	21	#include <linux/errno.h>
	22	#include <linux/swab.h>
	23	#include <linux/i2c.h>
7cee9aef	24	#include <linux/delay.h>
bfdb46ce RM	25	#include <linux/idr.h>
bfdb46ce RM	26	#include <linux/power_supply.h>
5a0e3ad6	27	#include <linux/slab.h>
9b9ade6b	28	#include <linux/ds2782_battery.h>
bfdb46ce RM	29
	30	#define DS2782_REG_RARC 0x06 /* Remaining active relative capacity */
	31
9b9ade6b YV	32	#define DS278x_REG_VOLT_MSB 0x0c
	33	#define DS278x_REG_TEMP_MSB 0x0a
	34	#define DS278x_REG_CURRENT_MSB 0x0e
bfdb46ce RM	35
	36	/* EEPROM Block */
	37	#define DS2782_REG_RSNSP 0x69 /* Sense resistor value */
	38
	39	/* Current unit measurement in uA for a 1 milli-ohm sense resistor */
	40	#define DS2782_CURRENT_UNITS 1563
	41
9b9ade6b YV	42	#define DS2786_REG_RARC 0x02 /* Remaining active relative capacity */
	43
	44	#define DS2786_CURRENT_UNITS 25
	45
7cee9aef ER	46	#define DS278x_DELAY 1000
7cee9aef ER	47
9b9ade6b YV	48	struct ds278x_info;
	49
	50	struct ds278x_battery_ops {
eb9650d6	51	int (get_battery_current)(struct ds278x_info info, int *current_uA);
353f867b RM	52	int (get_battery_voltage)(struct ds278x_info info, int *voltage_uV);
353f867b RM	53	int (get_battery_capacity)(struct ds278x_info info, int *capacity);
9b9ade6b YV	54	};
9b9ade6b YV	55
297d716f	56	#define to_ds278x_info(x) power_supply_get_drvdata(x)
bfdb46ce	57
9b9ade6b	58	struct ds278x_info {
bfdb46ce	59	struct i2c_client *client;
297d716f KK	60	struct power_supply *battery;
297d716f KK	61	struct power_supply_desc battery_desc;
79fbdb66	62	const struct ds278x_battery_ops *ops;
7cee9aef	63	struct delayed_work bat_work;
bfdb46ce	64	int id;
9b9ade6b	65	int rsns;
7cee9aef ER	66	int capacity;
7cee9aef ER	67	int status; /* State Of Charge */
bfdb46ce RM	68	};
	69
	70	static DEFINE_IDR(battery_id);
	71	static DEFINE_MUTEX(battery_lock);
	72
9b9ade6b	73	static inline int ds278x_read_reg(struct ds278x_info info, int reg, u8 val)
bfdb46ce RM	74	{
	75	int ret;
	76
	77	ret = i2c_smbus_read_byte_data(info->client, reg);
	78	if (ret < 0) {
	79	dev_err(&info->client->dev, "register read failed\n");
	80	return ret;
	81	}
	82
	83	*val = ret;
	84	return 0;
	85	}
	86
9b9ade6b	87	static inline int ds278x_read_reg16(struct ds278x_info *info, int reg_msb,
bfdb46ce RM	88	s16 *val)
	89	{
	90	int ret;
	91
8511748b	92	ret = i2c_smbus_read_word_data(info->client, reg_msb);
bfdb46ce RM	93	if (ret < 0) {
	94	dev_err(&info->client->dev, "register read failed\n");
	95	return ret;
	96	}
	97
8511748b	98	*val = swab16(ret);
bfdb46ce RM	99	return 0;
	100	}
	101
9b9ade6b	102	static int ds278x_get_temp(struct ds278x_info info, int temp)
bfdb46ce RM	103	{
	104	s16 raw;
	105	int err;
	106
	107	/*
	108	* Temperature is measured in units of 0.125 degrees celcius, the
	109	* power_supply class measures temperature in tenths of degrees
	110	* celsius. The temperature value is stored as a 10 bit number, plus
	111	* sign in the upper bits of a 16 bit register.
	112	*/
9b9ade6b	113	err = ds278x_read_reg16(info, DS278x_REG_TEMP_MSB, &raw);
bfdb46ce RM	114	if (err)
	115	return err;
	116	temp = ((raw / 32) 125) / 100;
	117	return 0;
	118	}
	119
9b9ade6b	120	static int ds2782_get_current(struct ds278x_info info, int current_uA)
bfdb46ce RM	121	{
	122	int sense_res;
	123	int err;
	124	u8 sense_res_raw;
	125	s16 raw;
	126
	127	/*
	128	* The units of measurement for current are dependent on the value of
	129	* the sense resistor.
	130	*/
9b9ade6b	131	err = ds278x_read_reg(info, DS2782_REG_RSNSP, &sense_res_raw);
bfdb46ce RM	132	if (err)
	133	return err;
	134	if (sense_res_raw == 0) {
	135	dev_err(&info->client->dev, "sense resistor value is 0\n");
	136	return -ENXIO;
	137	}
	138	sense_res = 1000 / sense_res_raw;
	139
	140	dev_dbg(&info->client->dev, "sense resistor = %d milli-ohms\n",
	141	sense_res);
9b9ade6b	142	err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);
bfdb46ce RM	143	if (err)
	144	return err;
	145	current_uA = raw (DS2782_CURRENT_UNITS / sense_res);
	146	return 0;
	147	}
	148
353f867b	149	static int ds2782_get_voltage(struct ds278x_info info, int voltage_uV)
bfdb46ce RM	150	{
	151	s16 raw;
	152	int err;
	153
	154	/*
	155	* Voltage is measured in units of 4.88mV. The voltage is stored as
	156	* a 10-bit number plus sign, in the upper bits of a 16-bit register
	157	*/
9b9ade6b	158	err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);
bfdb46ce RM	159	if (err)
bfdb46ce RM	160	return err;
353f867b	161	voltage_uV = (raw / 32) 4800;
bfdb46ce RM	162	return 0;
	163	}
	164
9b9ade6b	165	static int ds2782_get_capacity(struct ds278x_info info, int capacity)
bfdb46ce RM	166	{
	167	int err;
	168	u8 raw;
	169
9b9ade6b	170	err = ds278x_read_reg(info, DS2782_REG_RARC, &raw);
bfdb46ce RM	171	if (err)
	172	return err;
	173	*capacity = raw;
2d31757c	174	return 0;
bfdb46ce RM	175	}
bfdb46ce RM	176
9b9ade6b YV	177	static int ds2786_get_current(struct ds278x_info info, int current_uA)
	178	{
	179	int err;
	180	s16 raw;
	181
	182	err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);
	183	if (err)
	184	return err;
	185	current_uA = (raw / 16) (DS2786_CURRENT_UNITS / info->rsns);
	186	return 0;
	187	}
	188
353f867b	189	static int ds2786_get_voltage(struct ds278x_info info, int voltage_uV)
9b9ade6b YV	190	{
	191	s16 raw;
	192	int err;
	193
	194	/*
	195	* Voltage is measured in units of 1.22mV. The voltage is stored as
1b5e1c6e	196	* a 12-bit number plus sign, in the upper bits of a 16-bit register
9b9ade6b YV	197	*/
	198	err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);
	199	if (err)
	200	return err;
353f867b	201	voltage_uV = (raw / 8) 1220;
9b9ade6b YV	202	return 0;
	203	}
	204
	205	static int ds2786_get_capacity(struct ds278x_info info, int capacity)
	206	{
	207	int err;
	208	u8 raw;
	209
	210	err = ds278x_read_reg(info, DS2786_REG_RARC, &raw);
	211	if (err)
	212	return err;
	213	/* Relative capacity is displayed with resolution 0.5 % */
	214	*capacity = raw/2 ;
	215	return 0;
	216	}
	217
	218	static int ds278x_get_status(struct ds278x_info info, int status)
bfdb46ce RM	219	{
	220	int err;
	221	int current_uA;
	222	int capacity;
	223
eb9650d6	224	err = info->ops->get_battery_current(info, &current_uA);
bfdb46ce RM	225	if (err)
	226	return err;
	227
eb9650d6	228	err = info->ops->get_battery_capacity(info, &capacity);
bfdb46ce RM	229	if (err)
	230	return err;
	231
7cee9aef ER	232	info->capacity = capacity;
7cee9aef ER	233
bfdb46ce RM	234	if (capacity == 100)
	235	*status = POWER_SUPPLY_STATUS_FULL;
	236	else if (current_uA == 0)
	237	*status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	238	else if (current_uA < 0)
	239	*status = POWER_SUPPLY_STATUS_DISCHARGING;
	240	else
	241	*status = POWER_SUPPLY_STATUS_CHARGING;
	242
	243	return 0;
	244	}
	245
9b9ade6b	246	static int ds278x_battery_get_property(struct power_supply *psy,
bfdb46ce RM	247	enum power_supply_property prop,
	248	union power_supply_propval *val)
	249	{
9b9ade6b	250	struct ds278x_info *info = to_ds278x_info(psy);
bfdb46ce RM	251	int ret;
	252
	253	switch (prop) {
	254	case POWER_SUPPLY_PROP_STATUS:
9b9ade6b	255	ret = ds278x_get_status(info, &val->intval);
bfdb46ce RM	256	break;
	257
	258	case POWER_SUPPLY_PROP_CAPACITY:
eb9650d6	259	ret = info->ops->get_battery_capacity(info, &val->intval);
bfdb46ce RM	260	break;
	261
	262	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
eb9650d6	263	ret = info->ops->get_battery_voltage(info, &val->intval);
bfdb46ce RM	264	break;
	265
	266	case POWER_SUPPLY_PROP_CURRENT_NOW:
eb9650d6	267	ret = info->ops->get_battery_current(info, &val->intval);
bfdb46ce RM	268	break;
	269
	270	case POWER_SUPPLY_PROP_TEMP:
9b9ade6b	271	ret = ds278x_get_temp(info, &val->intval);
bfdb46ce RM	272	break;
	273
	274	default:
	275	ret = -EINVAL;
	276	}
	277
	278	return ret;
	279	}
	280
7cee9aef ER	281	static void ds278x_bat_update(struct ds278x_info *info)
	282	{
	283	int old_status = info->status;
	284	int old_capacity = info->capacity;
	285
	286	ds278x_get_status(info, &info->status);
	287
	288	if ((old_status != info->status) \|\| (old_capacity != info->capacity))
297d716f	289	power_supply_changed(info->battery);
7cee9aef ER	290	}
	291
	292	static void ds278x_bat_work(struct work_struct *work)
	293	{
	294	struct ds278x_info *info;
	295
	296	info = container_of(work, struct ds278x_info, bat_work.work);
	297	ds278x_bat_update(info);
	298
	299	schedule_delayed_work(&info->bat_work, DS278x_DELAY);
	300	}
	301
9b9ade6b	302	static enum power_supply_property ds278x_battery_props[] = {
bfdb46ce RM	303	POWER_SUPPLY_PROP_STATUS,
	304	POWER_SUPPLY_PROP_CAPACITY,
	305	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	306	POWER_SUPPLY_PROP_CURRENT_NOW,
	307	POWER_SUPPLY_PROP_TEMP,
	308	};
	309
297d716f	310	static void ds278x_power_supply_init(struct power_supply_desc *battery)
bfdb46ce RM	311	{
bfdb46ce RM	312	battery->type = POWER_SUPPLY_TYPE_BATTERY;
9b9ade6b YV	313	battery->properties = ds278x_battery_props;
	314	battery->num_properties = ARRAY_SIZE(ds278x_battery_props);
	315	battery->get_property = ds278x_battery_get_property;
bfdb46ce RM	316	battery->external_power_changed = NULL;
	317	}
	318
9b9ade6b	319	static int ds278x_battery_remove(struct i2c_client *client)
bfdb46ce	320	{
9b9ade6b	321	struct ds278x_info *info = i2c_get_clientdata(client);
bfdb46ce	322
297d716f KK	323	power_supply_unregister(info->battery);
297d716f KK	324	kfree(info->battery_desc.name);
bfdb46ce RM	325
	326	mutex_lock(&battery_lock);
	327	idr_remove(&battery_id, info->id);
	328	mutex_unlock(&battery_lock);
	329
7cee9aef ER	330	cancel_delayed_work(&info->bat_work);
7cee9aef ER	331
bfdb46ce RM	332	kfree(info);
	333	return 0;
	334	}
	335
cc6616f6	336	#ifdef CONFIG_PM_SLEEP
7cee9aef	337
cc6616f6	338	static int ds278x_suspend(struct device *dev)
7cee9aef	339	{
cc6616f6	340	struct i2c_client *client = to_i2c_client(dev);
7cee9aef ER	341	struct ds278x_info *info = i2c_get_clientdata(client);
	342
	343	cancel_delayed_work(&info->bat_work);
	344	return 0;
	345	}
	346
cc6616f6	347	static int ds278x_resume(struct device *dev)
7cee9aef	348	{
cc6616f6	349	struct i2c_client *client = to_i2c_client(dev);
7cee9aef ER	350	struct ds278x_info *info = i2c_get_clientdata(client);
	351
	352	schedule_delayed_work(&info->bat_work, DS278x_DELAY);
	353	return 0;
	354	}
99a79565	355	#endif /* CONFIG_PM_SLEEP */
7cee9aef	356
cc6616f6	357	static SIMPLE_DEV_PM_OPS(ds278x_battery_pm_ops, ds278x_suspend, ds278x_resume);
7cee9aef	358
ab6cc8f9 AV	359	enum ds278x_num_id {
	360	DS2782 = 0,
	361	DS2786,
	362	};
	363
79fbdb66	364	static const struct ds278x_battery_ops ds278x_ops[] = {
ab6cc8f9	365	[DS2782] = {
eb9650d6 PH	366	.get_battery_current = ds2782_get_current,
	367	.get_battery_voltage = ds2782_get_voltage,
	368	.get_battery_capacity = ds2782_get_capacity,
9b9ade6b	369	},
ab6cc8f9	370	[DS2786] = {
eb9650d6 PH	371	.get_battery_current = ds2786_get_current,
	372	.get_battery_voltage = ds2786_get_voltage,
	373	.get_battery_capacity = ds2786_get_capacity,
9b9ade6b YV	374	}
	375	};
	376
	377	static int ds278x_battery_probe(struct i2c_client *client,
bfdb46ce RM	378	const struct i2c_device_id *id)
bfdb46ce RM	379	{
9b9ade6b	380	struct ds278x_platform_data *pdata = client->dev.platform_data;
297d716f	381	struct power_supply_config psy_cfg = {};
9b9ade6b	382	struct ds278x_info *info;
bfdb46ce RM	383	int ret;
	384	int num;
	385
9b9ade6b YV	386	/*
	387	* ds2786 should have the sense resistor value set
	388	* in the platform data
	389	*/
ab6cc8f9	390	if (id->driver_data == DS2786 && !pdata) {
9b9ade6b YV	391	dev_err(&client->dev, "missing platform data for ds2786\n");
	392	return -EINVAL;
	393	}
	394
bfdb46ce	395	/* Get an ID for this battery */
bfdb46ce	396	mutex_lock(&battery_lock);
05e2cefa	397	ret = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
bfdb46ce RM	398	mutex_unlock(&battery_lock);
	399	if (ret < 0)
	400	goto fail_id;
05e2cefa	401	num = ret;
bfdb46ce RM	402
	403	info = kzalloc(sizeof(*info), GFP_KERNEL);
	404	if (!info) {
	405	ret = -ENOMEM;
	406	goto fail_info;
	407	}
	408
297d716f KK	409	info->battery_desc.name = kasprintf(GFP_KERNEL, "%s-%d",
	410	client->name, num);
	411	if (!info->battery_desc.name) {
bfdb46ce RM	412	ret = -ENOMEM;
	413	goto fail_name;
	414	}
	415
ab6cc8f9	416	if (id->driver_data == DS2786)
9b9ade6b YV	417	info->rsns = pdata->rsns;
9b9ade6b YV	418
bfdb46ce RM	419	i2c_set_clientdata(client, info);
bfdb46ce RM	420	info->client = client;
9b9ade6b YV	421	info->id = num;
9b9ade6b YV	422	info->ops = &ds278x_ops[id->driver_data];
297d716f KK	423	ds278x_power_supply_init(&info->battery_desc);
297d716f KK	424	psy_cfg.drv_data = info;
bfdb46ce	425
7cee9aef ER	426	info->capacity = 100;
	427	info->status = POWER_SUPPLY_STATUS_FULL;
	428
	429	INIT_DELAYED_WORK(&info->bat_work, ds278x_bat_work);
	430
297d716f KK	431	info->battery = power_supply_register(&client->dev,
	432	&info->battery_desc, &psy_cfg);
	433	if (IS_ERR(info->battery)) {
bfdb46ce	434	dev_err(&client->dev, "failed to register battery\n");
297d716f	435	ret = PTR_ERR(info->battery);
bfdb46ce	436	goto fail_register;
7cee9aef ER	437	} else {
7cee9aef ER	438	schedule_delayed_work(&info->bat_work, DS278x_DELAY);
bfdb46ce RM	439	}
	440
	441	return 0;
	442
	443	fail_register:
297d716f	444	kfree(info->battery_desc.name);
bfdb46ce	445	fail_name:
bfdb46ce RM	446	kfree(info);
	447	fail_info:
	448	mutex_lock(&battery_lock);
	449	idr_remove(&battery_id, num);
	450	mutex_unlock(&battery_lock);
	451	fail_id:
	452	return ret;
	453	}
	454
9b9ade6b	455	static const struct i2c_device_id ds278x_id[] = {
ab6cc8f9 AV	456	{"ds2782", DS2782},
ab6cc8f9 AV	457	{"ds2786", DS2786},
bfdb46ce RM	458	{},
bfdb46ce RM	459	};
84ab16f5	460	MODULE_DEVICE_TABLE(i2c, ds278x_id);
bfdb46ce	461
9b9ade6b	462	static struct i2c_driver ds278x_battery_driver = {
bfdb46ce RM	463	.driver = {
bfdb46ce RM	464	.name = "ds2782-battery",
99a79565	465	.pm = &ds278x_battery_pm_ops,
bfdb46ce	466	},
9b9ade6b YV	467	.probe = ds278x_battery_probe,
	468	.remove = ds278x_battery_remove,
	469	.id_table = ds278x_id,
bfdb46ce	470	};
5ff92e7a	471	module_i2c_driver(ds278x_battery_driver);
bfdb46ce	472
1c5454ee	473	MODULE_AUTHOR("Ryan Mallon");
bfdb46ce RM	474	MODULE_DESCRIPTION("Maxim/Dallas DS2782 Stand-Alone Fuel Gauage IC driver");
bfdb46ce RM	475	MODULE_LICENSE("GPL");