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	psy_cfg.of_node = client->dev.of_node;
163	psy_cfg.drv_data = battery;
164
165	battery->psy = devm_power_supply_register(&client->dev,
166						  &rt5033_battery_desc,
167						  &psy_cfg);
168	if (IS_ERR(battery->psy))
169		return dev_err_probe(&client->dev, PTR_ERR(battery->psy),
170				     "Failed to register power supply\n");
171
172	return 0;
173}
174
175static const struct i2c_device_id rt5033_battery_id[] = {
176	{ "rt5033-battery", },
177	{ }
178};
179MODULE_DEVICE_TABLE(i2c, rt5033_battery_id);
180
181static const struct of_device_id rt5033_battery_of_match[] = {
182	{ .compatible = "richtek,rt5033-battery", },
183	{ }
184};
185MODULE_DEVICE_TABLE(of, rt5033_battery_of_match);
186
187static struct i2c_driver rt5033_battery_driver = {
188	.driver = {
189		.name = "rt5033-battery",
190		.of_match_table = rt5033_battery_of_match,
191	},
192	.probe = rt5033_battery_probe,
193	.id_table = rt5033_battery_id,
194};
195module_i2c_driver(rt5033_battery_driver);
196
197MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
198MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
199MODULE_LICENSE("GPL");
200