rt5033_battery.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Fuel gauge driver for Richtek RT5033
  4 *
  5 * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
  6 * Author: Beomho Seo <beomho.seo@samsung.com>
  7 */
  8
  9#include <linux/i2c.h>
 10#include <linux/module.h>
 11#include <linux/platform_device.h>
 12#include <linux/power_supply.h>
 13#include <linux/regmap.h>
 14#include <linux/mfd/rt5033-private.h>
 15
 16struct rt5033_battery {
 17	struct i2c_client	*client;
 18	struct regmap		*regmap;
 19	struct power_supply	*psy;
 20};
 21
 22static int rt5033_battery_get_status(struct i2c_client *client)
 23{
 24	struct rt5033_battery *battery = i2c_get_clientdata(client);
 25	union power_supply_propval val;
 26	int ret;
 27
 28	ret = power_supply_get_property_from_supplier(battery->psy,
 29						POWER_SUPPLY_PROP_STATUS,
 30						&val);
 31	if (ret)
 32		val.intval = POWER_SUPPLY_STATUS_UNKNOWN;
 33
 34	return val.intval;
 35}
 36
 37static int rt5033_battery_get_capacity(struct i2c_client *client)
 38{
 39	struct rt5033_battery *battery = i2c_get_clientdata(client);
 40	u32 msb;
 41
 42	regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
 43
 44	return msb;
 45}
 46
 47static int rt5033_battery_get_present(struct i2c_client *client)
 48{
 49	struct rt5033_battery *battery = i2c_get_clientdata(client);
 50	u32 val;
 51
 52	regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
 53
 54	return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
 55}
 56
 57static int rt5033_battery_get_watt_prop(struct i2c_client *client,
 58		enum power_supply_property psp)
 59{
 60	struct rt5033_battery *battery = i2c_get_clientdata(client);
 61	unsigned int regh, regl;
 62	int ret;
 63	u32 msb, lsb;
 64
 65	switch (psp) {
 66	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 67		regh = RT5033_FUEL_REG_VBAT_H;
 68		regl = RT5033_FUEL_REG_VBAT_L;
 69		break;
 70	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 71		regh = RT5033_FUEL_REG_AVG_VOLT_H;
 72		regl = RT5033_FUEL_REG_AVG_VOLT_L;
 73		break;
 74	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 75		regh = RT5033_FUEL_REG_OCV_H;
 76		regl = RT5033_FUEL_REG_OCV_L;
 77		break;
 78	default:
 79		return -EINVAL;
 80	}
 81
 82	regmap_read(battery->regmap, regh, &msb);
 83	regmap_read(battery->regmap, regl, &lsb);
 84
 85	ret = ((msb << 4) + (lsb >> 4)) * 1250;
 86
 87	return ret;
 88}
 89
 90static int rt5033_battery_get_property(struct power_supply *psy,
 91		enum power_supply_property psp,
 92		union power_supply_propval *val)
 93{
 94	struct rt5033_battery *battery = power_supply_get_drvdata(psy);
 95
 96	switch (psp) {
 97	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 98	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 99	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
100		val->intval = rt5033_battery_get_watt_prop(battery->client,
101									psp);
102		break;
103	case POWER_SUPPLY_PROP_PRESENT:
104		val->intval = rt5033_battery_get_present(battery->client);
105		break;
106	case POWER_SUPPLY_PROP_CAPACITY:
107		val->intval = rt5033_battery_get_capacity(battery->client);
108		break;
109	case POWER_SUPPLY_PROP_STATUS:
110		val->intval = rt5033_battery_get_status(battery->client);
111		break;
112	default:
113		return -EINVAL;
114	}
115	return 0;
116}
117
118static enum power_supply_property rt5033_battery_props[] = {
119	POWER_SUPPLY_PROP_VOLTAGE_NOW,
120	POWER_SUPPLY_PROP_VOLTAGE_AVG,
121	POWER_SUPPLY_PROP_VOLTAGE_OCV,
122	POWER_SUPPLY_PROP_PRESENT,
123	POWER_SUPPLY_PROP_CAPACITY,
124	POWER_SUPPLY_PROP_STATUS,
125};
126
127static const struct regmap_config rt5033_battery_regmap_config = {
128	.reg_bits	= 8,
129	.val_bits	= 8,
130	.max_register	= RT5033_FUEL_REG_END,
131};
132
133static const struct power_supply_desc rt5033_battery_desc = {
134	.name		= "rt5033-battery",
135	.type		= POWER_SUPPLY_TYPE_BATTERY,
136	.get_property	= rt5033_battery_get_property,
137	.properties	= rt5033_battery_props,
138	.num_properties	= ARRAY_SIZE(rt5033_battery_props),
139};
140
141static int rt5033_battery_probe(struct i2c_client *client)
142{
143	struct i2c_adapter *adapter = client->adapter;
144	struct power_supply_config psy_cfg = {};
145	struct rt5033_battery *battery;
146
147	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
148		return -EIO;
149
150	battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
151	if (!battery)
152		return -ENOMEM;
153
154	battery->client = client;
155	battery->regmap = devm_regmap_init_i2c(client,
156			&rt5033_battery_regmap_config);
157	if (IS_ERR(battery->regmap)) {
158		dev_err(&client->dev, "Failed to initialize regmap\n");
159		return -EINVAL;
160	}
161
162	i2c_set_clientdata(client, battery);
163	psy_cfg.fwnode = dev_fwnode(&client->dev);
164	psy_cfg.drv_data = battery;
165
166	battery->psy = devm_power_supply_register(&client->dev,
167						  &rt5033_battery_desc,
168						  &psy_cfg);
169	if (IS_ERR(battery->psy))
170		return dev_err_probe(&client->dev, PTR_ERR(battery->psy),
171				     "Failed to register power supply\n");
172
173	return 0;
174}
175
176static const struct i2c_device_id rt5033_battery_id[] = {
177	{ "rt5033-battery", },
178	{ }
179};
180MODULE_DEVICE_TABLE(i2c, rt5033_battery_id);
181
182static const struct of_device_id rt5033_battery_of_match[] = {
183	{ .compatible = "richtek,rt5033-battery", },
184	{ }
185};
186MODULE_DEVICE_TABLE(of, rt5033_battery_of_match);
187
188static struct i2c_driver rt5033_battery_driver = {
189	.driver = {
190		.name = "rt5033-battery",
191		.of_match_table = rt5033_battery_of_match,
192	},
193	.probe = rt5033_battery_probe,
194	.id_table = rt5033_battery_id,
195};
196module_i2c_driver(rt5033_battery_driver);
197
198MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
199MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
200MODULE_LICENSE("GPL");