blob: 7b898f41c59540b6560e735a73466d73423d5371 [file] [log] [blame]
Beomho Seob847dd92015-01-09 17:45:11 +09001/*
2 * Fuel gauge driver for Richtek RT5033
3 *
4 * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
5 * Author: Beomho Seo <beomho.seo@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published bythe Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/power_supply.h>
15#include <linux/mfd/rt5033-private.h>
16#include <linux/mfd/rt5033.h>
17
18static int rt5033_battery_get_capacity(struct i2c_client *client)
19{
20 struct rt5033_battery *battery = i2c_get_clientdata(client);
21 u32 msb;
22
23 regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
24
25 return msb;
26}
27
28static int rt5033_battery_get_present(struct i2c_client *client)
29{
30 struct rt5033_battery *battery = i2c_get_clientdata(client);
31 u32 val;
32
33 regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
34
35 return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
36}
37
38static int rt5033_battery_get_watt_prop(struct i2c_client *client,
39 enum power_supply_property psp)
40{
41 struct rt5033_battery *battery = i2c_get_clientdata(client);
42 unsigned int regh, regl;
43 int ret;
44 u32 msb, lsb;
45
46 switch (psp) {
47 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
48 regh = RT5033_FUEL_REG_VBAT_H;
49 regl = RT5033_FUEL_REG_VBAT_L;
50 break;
51 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
52 regh = RT5033_FUEL_REG_AVG_VOLT_H;
53 regl = RT5033_FUEL_REG_AVG_VOLT_L;
54 break;
55 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
56 regh = RT5033_FUEL_REG_OCV_H;
57 regl = RT5033_FUEL_REG_OCV_L;
58 break;
59 default:
60 return -EINVAL;
61 }
62
63 regmap_read(battery->regmap, regh, &msb);
64 regmap_read(battery->regmap, regl, &lsb);
65
66 ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;
67
68 return ret;
69}
70
71static int rt5033_battery_get_property(struct power_supply *psy,
72 enum power_supply_property psp,
73 union power_supply_propval *val)
74{
75 struct rt5033_battery *battery = container_of(psy,
76 struct rt5033_battery, psy);
77
78 switch (psp) {
79 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
80 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
81 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
82 val->intval = rt5033_battery_get_watt_prop(battery->client,
83 psp);
84 break;
85 case POWER_SUPPLY_PROP_PRESENT:
86 val->intval = rt5033_battery_get_present(battery->client);
87 break;
88 case POWER_SUPPLY_PROP_CAPACITY:
89 val->intval = rt5033_battery_get_capacity(battery->client);
90 break;
91 default:
92 return -EINVAL;
93 }
94 return 0;
95}
96
97static enum power_supply_property rt5033_battery_props[] = {
98 POWER_SUPPLY_PROP_VOLTAGE_NOW,
99 POWER_SUPPLY_PROP_VOLTAGE_AVG,
100 POWER_SUPPLY_PROP_VOLTAGE_OCV,
101 POWER_SUPPLY_PROP_PRESENT,
102 POWER_SUPPLY_PROP_CAPACITY,
103};
104
105static struct regmap_config rt5033_battery_regmap_config = {
106 .reg_bits = 8,
107 .val_bits = 8,
108 .max_register = RT5033_FUEL_REG_END,
109};
110
111static int rt5033_battery_probe(struct i2c_client *client,
112 const struct i2c_device_id *id)
113{
114 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
115 struct rt5033_battery *battery;
116 u32 ret;
117
118 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
119 return -EIO;
120
121 battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
122 if (!battery)
123 return -EINVAL;
124
125 battery->client = client;
126 battery->regmap = devm_regmap_init_i2c(client,
127 &rt5033_battery_regmap_config);
128 if (IS_ERR(battery->regmap)) {
129 dev_err(&client->dev, "Failed to initialize regmap\n");
130 return -EINVAL;
131 }
132
133 i2c_set_clientdata(client, battery);
134
135 battery->psy.name = "rt5033-battery";
136 battery->psy.type = POWER_SUPPLY_TYPE_BATTERY;
137 battery->psy.get_property = rt5033_battery_get_property;
138 battery->psy.properties = rt5033_battery_props;
139 battery->psy.num_properties = ARRAY_SIZE(rt5033_battery_props);
140
141 ret = power_supply_register(&client->dev, &battery->psy);
142 if (ret) {
143 dev_err(&client->dev, "Failed to register power supply\n");
144 return ret;
145 }
146
147 return 0;
148}
149
150static int rt5033_battery_remove(struct i2c_client *client)
151{
152 struct rt5033_battery *battery = i2c_get_clientdata(client);
153
154 power_supply_unregister(&battery->psy);
155
156 return 0;
157}
158
159static const struct i2c_device_id rt5033_battery_id[] = {
160 { "rt5033-battery", },
161 { }
162};
163MODULE_DEVICE_TABLE(platform, rt5033_battery_id);
164
165static struct i2c_driver rt5033_battery_driver = {
166 .driver = {
167 .name = "rt5033-battery",
168 },
169 .probe = rt5033_battery_probe,
170 .remove = rt5033_battery_remove,
171 .id_table = rt5033_battery_id,
172};
173module_i2c_driver(rt5033_battery_driver);
174
175MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
176MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
177MODULE_LICENSE("GPL");