[deliverable/linux.git] / drivers / power / rt5033_battery.c

/*
 * Fuel gauge driver for Richtek RT5033
 *
 * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
 * Author: Beomho Seo <beomho.seo@samsung.com>
 *
 * 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 bythe Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/rt5033-private.h>
#include <linux/mfd/rt5033.h>

static int rt5033_battery_get_capacity(struct i2c_client *client)
{
	struct rt5033_battery *battery = i2c_get_clientdata(client);
	u32 msb;

	regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);

	return msb;
}

static int rt5033_battery_get_present(struct i2c_client *client)
{
	struct rt5033_battery *battery = i2c_get_clientdata(client);
	u32 val;

	regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);

	return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
}

static int rt5033_battery_get_watt_prop(struct i2c_client *client,
		enum power_supply_property psp)
{
	struct rt5033_battery *battery = i2c_get_clientdata(client);
	unsigned int regh, regl;
	int ret;
	u32 msb, lsb;

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		regh = RT5033_FUEL_REG_VBAT_H;
		regl = RT5033_FUEL_REG_VBAT_L;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		regh = RT5033_FUEL_REG_AVG_VOLT_H;
		regl = RT5033_FUEL_REG_AVG_VOLT_L;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
		regh = RT5033_FUEL_REG_OCV_H;
		regl = RT5033_FUEL_REG_OCV_L;
		break;
	default:
		return -EINVAL;
	}

	regmap_read(battery->regmap, regh, &msb);
	regmap_read(battery->regmap, regl, &lsb);

	ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;

	return ret;
}

static int rt5033_battery_get_property(struct power_supply *psy,
		enum power_supply_property psp,
		union power_supply_propval *val)
{
	struct rt5033_battery *battery = container_of(psy,
				struct rt5033_battery, psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
		val->intval = rt5033_battery_get_watt_prop(battery->client,
									psp);
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = rt5033_battery_get_present(battery->client);
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		val->intval = rt5033_battery_get_capacity(battery->client);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static enum power_supply_property rt5033_battery_props[] = {
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_VOLTAGE_OCV,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_CAPACITY,
};

static const struct regmap_config rt5033_battery_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= RT5033_FUEL_REG_END,
};

static int rt5033_battery_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	struct rt5033_battery *battery;
	u32 ret;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
		return -EIO;

	battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
	if (!battery)
		return -EINVAL;

	battery->client = client;
	battery->regmap = devm_regmap_init_i2c(client,
			&rt5033_battery_regmap_config);
	if (IS_ERR(battery->regmap)) {
		dev_err(&client->dev, "Failed to initialize regmap\n");
		return -EINVAL;
	}

	i2c_set_clientdata(client, battery);

	battery->psy.name		= "rt5033-battery";
	battery->psy.type		= POWER_SUPPLY_TYPE_BATTERY;
	battery->psy.get_property	= rt5033_battery_get_property;
	battery->psy.properties		= rt5033_battery_props;
	battery->psy.num_properties	= ARRAY_SIZE(rt5033_battery_props);

	ret = power_supply_register(&client->dev, &battery->psy, NULL);
	if (ret) {
		dev_err(&client->dev, "Failed to register power supply\n");
		return ret;
	}

	return 0;
}

static int rt5033_battery_remove(struct i2c_client *client)
{
	struct rt5033_battery *battery = i2c_get_clientdata(client);

	power_supply_unregister(&battery->psy);

	return 0;
}

static const struct i2c_device_id rt5033_battery_id[] = {
	{ "rt5033-battery", },
	{ }
};
MODULE_DEVICE_TABLE(platform, rt5033_battery_id);

static struct i2c_driver rt5033_battery_driver = {
	.driver = {
		.name = "rt5033-battery",
	},
	.probe = rt5033_battery_probe,
	.remove = rt5033_battery_remove,
	.id_table = rt5033_battery_id,
};
module_i2c_driver(rt5033_battery_driver);

MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
b847dd96 BS	1	/*
	2	* Fuel gauge driver for Richtek RT5033
	3	*
	4	* Copyright (C) 2014 Samsung Electronics, Co., Ltd.
	5	* Author: Beomho Seo <beomho.seo@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published bythe Free Software Foundation.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/power_supply.h>
	15	#include <linux/mfd/rt5033-private.h>
	16	#include <linux/mfd/rt5033.h>
	17
	18	static int rt5033_battery_get_capacity(struct i2c_client *client)
	19	{
	20	struct rt5033_battery *battery = i2c_get_clientdata(client);
	21	u32 msb;
	22
	23	regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
	24
	25	return msb;
	26	}
	27
	28	static int rt5033_battery_get_present(struct i2c_client *client)
	29	{
	30	struct rt5033_battery *battery = i2c_get_clientdata(client);
	31	u32 val;
	32
	33	regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
	34
	35	return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
	36	}
	37
	38	static int rt5033_battery_get_watt_prop(struct i2c_client *client,
	39	enum power_supply_property psp)
	40	{
	41	struct rt5033_battery *battery = i2c_get_clientdata(client);
	42	unsigned int regh, regl;
	43	int ret;
	44	u32 msb, lsb;
	45
	46	switch (psp) {
	47	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	48	regh = RT5033_FUEL_REG_VBAT_H;
	49	regl = RT5033_FUEL_REG_VBAT_L;
	50	break;
	51	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
	52	regh = RT5033_FUEL_REG_AVG_VOLT_H;
	53	regl = RT5033_FUEL_REG_AVG_VOLT_L;
	54	break;
	55	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
	56	regh = RT5033_FUEL_REG_OCV_H;
	57	regl = RT5033_FUEL_REG_OCV_L;
	58	break;
	59	default:
	60	return -EINVAL;
	61	}
	62
	63	regmap_read(battery->regmap, regh, &msb);
	64	regmap_read(battery->regmap, regl, &lsb);
65
66	ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;
67
68	return ret;
69	}
70
71	static int rt5033_battery_get_property(struct power_supply *psy,
72	enum power_supply_property psp,
73	union power_supply_propval *val)
74	{
75	struct rt5033_battery *battery = container_of(psy,
76	struct rt5033_battery, psy);
77
78	switch (psp) {
79	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
80	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
81	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
82	val->intval = rt5033_battery_get_watt_prop(battery->client,
83	psp);
84	break;
85	case POWER_SUPPLY_PROP_PRESENT:
86	val->intval = rt5033_battery_get_present(battery->client);
87	break;
88	case POWER_SUPPLY_PROP_CAPACITY:
89	val->intval = rt5033_battery_get_capacity(battery->client);
90	break;
91	default:
92	return -EINVAL;
93	}
94	return 0;
95	}
96
97	static enum power_supply_property rt5033_battery_props[] = {
98	POWER_SUPPLY_PROP_VOLTAGE_NOW,
99	POWER_SUPPLY_PROP_VOLTAGE_AVG,
100	POWER_SUPPLY_PROP_VOLTAGE_OCV,
101	POWER_SUPPLY_PROP_PRESENT,
102	POWER_SUPPLY_PROP_CAPACITY,
103	};
104
65ce1c95	105	static const struct regmap_config rt5033_battery_regmap_config = {
b847dd96 BS	106	.reg_bits = 8,
	107	.val_bits = 8,
	108	.max_register = RT5033_FUEL_REG_END,
	109	};
	110
	111	static int rt5033_battery_probe(struct i2c_client *client,
	112	const struct i2c_device_id *id)
	113	{
	114	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	115	struct rt5033_battery *battery;
	116	u32 ret;
	117
	118	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
	119	return -EIO;
	120
	121	battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
	122	if (!battery)
	123	return -EINVAL;
	124
	125	battery->client = client;
	126	battery->regmap = devm_regmap_init_i2c(client,
	127	&rt5033_battery_regmap_config);
	128	if (IS_ERR(battery->regmap)) {
	129	dev_err(&client->dev, "Failed to initialize regmap\n");
	130	return -EINVAL;
	131	}
	132
	133	i2c_set_clientdata(client, battery);
	134
	135	battery->psy.name = "rt5033-battery";
	136	battery->psy.type = POWER_SUPPLY_TYPE_BATTERY;
	137	battery->psy.get_property = rt5033_battery_get_property;
	138	battery->psy.properties = rt5033_battery_props;
	139	battery->psy.num_properties = ARRAY_SIZE(rt5033_battery_props);
	140
2dc9215d	141	ret = power_supply_register(&client->dev, &battery->psy, NULL);
b847dd96 BS	142	if (ret) {
	143	dev_err(&client->dev, "Failed to register power supply\n");
	144	return ret;
	145	}
	146
	147	return 0;
	148	}
	149
	150	static int rt5033_battery_remove(struct i2c_client *client)
	151	{
	152	struct rt5033_battery *battery = i2c_get_clientdata(client);
	153
	154	power_supply_unregister(&battery->psy);
	155
	156	return 0;
	157	}
	158
	159	static const struct i2c_device_id rt5033_battery_id[] = {
	160	{ "rt5033-battery", },
	161	{ }
	162	};
	163	MODULE_DEVICE_TABLE(platform, rt5033_battery_id);
	164
	165	static struct i2c_driver rt5033_battery_driver = {
	166	.driver = {
	167	.name = "rt5033-battery",
	168	},
	169	.probe = rt5033_battery_probe,
	170	.remove = rt5033_battery_remove,
	171	.id_table = rt5033_battery_id,
	172	};
	173	module_i2c_driver(rt5033_battery_driver);
	174
	175	MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
	176	MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
	177	MODULE_LICENSE("GPL");