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/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/power_supply.h>
12 #include <linux/mfd/rt5033-private.h>
13 #include <linux/mfd/rt5033.h>
14 
15 static int rt5033_battery_get_capacity(struct i2c_client *client)
16 {
17 	struct rt5033_battery *battery = i2c_get_clientdata(client);
18 	u32 msb;
19 
20 	regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
21 
22 	return msb;
23 }
24 
25 static int rt5033_battery_get_present(struct i2c_client *client)
26 {
27 	struct rt5033_battery *battery = i2c_get_clientdata(client);
28 	u32 val;
29 
30 	regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
31 
32 	return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
33 }
34 
35 static int rt5033_battery_get_watt_prop(struct i2c_client *client,
36 		enum power_supply_property psp)
37 {
38 	struct rt5033_battery *battery = i2c_get_clientdata(client);
39 	unsigned int regh, regl;
40 	int ret;
41 	u32 msb, lsb;
42 
43 	switch (psp) {
44 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
45 		regh = RT5033_FUEL_REG_VBAT_H;
46 		regl = RT5033_FUEL_REG_VBAT_L;
47 		break;
48 	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
49 		regh = RT5033_FUEL_REG_AVG_VOLT_H;
50 		regl = RT5033_FUEL_REG_AVG_VOLT_L;
51 		break;
52 	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
53 		regh = RT5033_FUEL_REG_OCV_H;
54 		regl = RT5033_FUEL_REG_OCV_L;
55 		break;
56 	default:
57 		return -EINVAL;
58 	}
59 
60 	regmap_read(battery->regmap, regh, &msb);
61 	regmap_read(battery->regmap, regl, &lsb);
62 
63 	ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;
64 
65 	return ret;
66 }
67 
68 static int rt5033_battery_get_property(struct power_supply *psy,
69 		enum power_supply_property psp,
70 		union power_supply_propval *val)
71 {
72 	struct rt5033_battery *battery = power_supply_get_drvdata(psy);
73 
74 	switch (psp) {
75 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
76 	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
77 	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
78 		val->intval = rt5033_battery_get_watt_prop(battery->client,
79 									psp);
80 		break;
81 	case POWER_SUPPLY_PROP_PRESENT:
82 		val->intval = rt5033_battery_get_present(battery->client);
83 		break;
84 	case POWER_SUPPLY_PROP_CAPACITY:
85 		val->intval = rt5033_battery_get_capacity(battery->client);
86 		break;
87 	default:
88 		return -EINVAL;
89 	}
90 	return 0;
91 }
92 
93 static enum power_supply_property rt5033_battery_props[] = {
94 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
95 	POWER_SUPPLY_PROP_VOLTAGE_AVG,
96 	POWER_SUPPLY_PROP_VOLTAGE_OCV,
97 	POWER_SUPPLY_PROP_PRESENT,
98 	POWER_SUPPLY_PROP_CAPACITY,
99 };
100 
101 static const struct regmap_config rt5033_battery_regmap_config = {
102 	.reg_bits	= 8,
103 	.val_bits	= 8,
104 	.max_register	= RT5033_FUEL_REG_END,
105 };
106 
107 static const struct power_supply_desc rt5033_battery_desc = {
108 	.name		= "rt5033-battery",
109 	.type		= POWER_SUPPLY_TYPE_BATTERY,
110 	.get_property	= rt5033_battery_get_property,
111 	.properties	= rt5033_battery_props,
112 	.num_properties	= ARRAY_SIZE(rt5033_battery_props),
113 };
114 
115 static int rt5033_battery_probe(struct i2c_client *client,
116 		const struct i2c_device_id *id)
117 {
118 	struct i2c_adapter *adapter = client->adapter;
119 	struct power_supply_config psy_cfg = {};
120 	struct rt5033_battery *battery;
121 	u32 ret;
122 
123 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
124 		return -EIO;
125 
126 	battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
127 	if (!battery)
128 		return -ENOMEM;
129 
130 	battery->client = client;
131 	battery->regmap = devm_regmap_init_i2c(client,
132 			&rt5033_battery_regmap_config);
133 	if (IS_ERR(battery->regmap)) {
134 		dev_err(&client->dev, "Failed to initialize regmap\n");
135 		return -EINVAL;
136 	}
137 
138 	i2c_set_clientdata(client, battery);
139 	psy_cfg.drv_data = battery;
140 
141 	battery->psy = power_supply_register(&client->dev,
142 					     &rt5033_battery_desc, &psy_cfg);
143 	if (IS_ERR(battery->psy)) {
144 		dev_err(&client->dev, "Failed to register power supply\n");
145 		ret = PTR_ERR(battery->psy);
146 		return ret;
147 	}
148 
149 	return 0;
150 }
151 
152 static int rt5033_battery_remove(struct i2c_client *client)
153 {
154 	struct rt5033_battery *battery = i2c_get_clientdata(client);
155 
156 	power_supply_unregister(battery->psy);
157 
158 	return 0;
159 }
160 
161 static const struct i2c_device_id rt5033_battery_id[] = {
162 	{ "rt5033-battery", },
163 	{ }
164 };
165 MODULE_DEVICE_TABLE(i2c, rt5033_battery_id);
166 
167 static struct i2c_driver rt5033_battery_driver = {
168 	.driver = {
169 		.name = "rt5033-battery",
170 	},
171 	.probe = rt5033_battery_probe,
172 	.remove = rt5033_battery_remove,
173 	.id_table = rt5033_battery_id,
174 };
175 module_i2c_driver(rt5033_battery_driver);
176 
177 MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
178 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
179 MODULE_LICENSE("GPL");
180