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(psy: battery->psy,
29 psp: POWER_SUPPLY_PROP_STATUS,
30 val: &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(map: battery->regmap, reg: RT5033_FUEL_REG_SOC_H, val: &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(map: battery->regmap, reg: RT5033_FUEL_REG_CONFIG_L, val: &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(map: battery->regmap, reg: regh, val: &msb);
83 regmap_read(map: battery->regmap, reg: regl, val: &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(client: battery->client,
101 psp);
102 break;
103 case POWER_SUPPLY_PROP_PRESENT:
104 val->intval = rt5033_battery_get_present(client: battery->client);
105 break;
106 case POWER_SUPPLY_PROP_CAPACITY:
107 val->intval = rt5033_battery_get_capacity(client: battery->client);
108 break;
109 case POWER_SUPPLY_PROP_STATUS:
110 val->intval = rt5033_battery_get_status(client: 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(adap: adapter, I2C_FUNC_SMBUS_BYTE))
148 return -EIO;
149
150 battery = devm_kzalloc(dev: &client->dev, size: 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(ptr: battery->regmap)) {
158 dev_err(&client->dev, "Failed to initialize regmap\n");
159 return -EINVAL;
160 }
161
162 i2c_set_clientdata(client, data: battery);
163 psy_cfg.fwnode = dev_fwnode(&client->dev);
164 psy_cfg.drv_data = battery;
165
166 battery->psy = devm_power_supply_register(parent: &client->dev,
167 desc: &rt5033_battery_desc,
168 cfg: &psy_cfg);
169 if (IS_ERR(ptr: battery->psy))
170 return dev_err_probe(dev: &client->dev, err: PTR_ERR(ptr: battery->psy),
171 fmt: "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");
201

source code of linux/drivers/power/supply/rt5033_battery.c