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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
15static 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
25static 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
35static 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
68static 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
93static 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
101static 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
107static 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
115static 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
152static 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
161static const struct i2c_device_id rt5033_battery_id[] = {
162 { "rt5033-battery", },
163 { }
164};
165MODULE_DEVICE_TABLE(i2c, rt5033_battery_id);
166
167static 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};
175module_i2c_driver(rt5033_battery_driver);
176
177MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
178MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
179MODULE_LICENSE("GPL");
180
