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8#include <linux/err.h>
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/platform_device.h>
12#include <linux/power_supply.h>
13#include <linux/mfd/max8997.h>
14#include <linux/mfd/max8997-private.h>
15
16struct charger_data {
17 struct device *dev;
18 struct max8997_dev *iodev;
19 struct power_supply *battery;
20};
21
22static enum power_supply_property max8997_battery_props[] = {
23 POWER_SUPPLY_PROP_STATUS,
24 POWER_SUPPLY_PROP_PRESENT,
25 POWER_SUPPLY_PROP_ONLINE,
26};
27
28
29static int max8997_battery_get_property(struct power_supply *psy,
30 enum power_supply_property psp,
31 union power_supply_propval *val)
32{
33 struct charger_data *charger = power_supply_get_drvdata(psy);
34 struct i2c_client *i2c = charger->iodev->i2c;
35 int ret;
36 u8 reg;
37
38 switch (psp) {
39 case POWER_SUPPLY_PROP_STATUS:
40 val->intval = 0;
41 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
42 if (ret)
43 return ret;
44 if ((reg & (1 << 0)) == 0x1)
45 val->intval = POWER_SUPPLY_STATUS_FULL;
46
47 break;
48 case POWER_SUPPLY_PROP_PRESENT:
49 val->intval = 0;
50 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
51 if (ret)
52 return ret;
53 if ((reg & (1 << 2)) == 0x0)
54 val->intval = 1;
55
56 break;
57 case POWER_SUPPLY_PROP_ONLINE:
58 val->intval = 0;
59 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
60 if (ret)
61 return ret;
62
63 if (reg & (1 << 1))
64 val->intval = 1;
65
66 break;
67 default:
68 return -EINVAL;
69 }
70
71 return 0;
72}
73
74static const struct power_supply_desc max8997_battery_desc = {
75 .name = "max8997_pmic",
76 .type = POWER_SUPPLY_TYPE_BATTERY,
77 .get_property = max8997_battery_get_property,
78 .properties = max8997_battery_props,
79 .num_properties = ARRAY_SIZE(max8997_battery_props),
80};
81
82static int max8997_battery_probe(struct platform_device *pdev)
83{
84 int ret = 0;
85 struct charger_data *charger;
86 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
87 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
88 struct power_supply_config psy_cfg = {};
89
90 if (!pdata)
91 return -EINVAL;
92
93 if (pdata->eoc_mA) {
94 int val = (pdata->eoc_mA - 50) / 10;
95 if (val < 0)
96 val = 0;
97 if (val > 0xf)
98 val = 0xf;
99
100 ret = max8997_update_reg(iodev->i2c,
101 MAX8997_REG_MBCCTRL5, val, 0xf);
102 if (ret < 0) {
103 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
104 return ret;
105 }
106 }
107
108 switch (pdata->timeout) {
109 case 5:
110 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
111 0x2 << 4, 0x7 << 4);
112 break;
113 case 6:
114 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
115 0x3 << 4, 0x7 << 4);
116 break;
117 case 7:
118 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
119 0x4 << 4, 0x7 << 4);
120 break;
121 case 0:
122 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
123 0x7 << 4, 0x7 << 4);
124 break;
125 default:
126 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
127 pdata->timeout);
128 return -EINVAL;
129 }
130 if (ret < 0) {
131 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
132 return ret;
133 }
134
135 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
136 if (!charger)
137 return -ENOMEM;
138
139 platform_set_drvdata(pdev, charger);
140
141
142 charger->dev = &pdev->dev;
143 charger->iodev = iodev;
144
145 psy_cfg.drv_data = charger;
146
147 charger->battery = devm_power_supply_register(&pdev->dev,
148 &max8997_battery_desc,
149 &psy_cfg);
150 if (IS_ERR(charger->battery)) {
151 dev_err(&pdev->dev, "failed: power supply register\n");
152 return PTR_ERR(charger->battery);
153 }
154
155 return 0;
156}
157
158static const struct platform_device_id max8997_battery_id[] = {
159 { "max8997-battery", 0 },
160 { }
161};
162MODULE_DEVICE_TABLE(platform, max8997_battery_id);
163
164static struct platform_driver max8997_battery_driver = {
165 .driver = {
166 .name = "max8997-battery",
167 },
168 .probe = max8997_battery_probe,
169 .id_table = max8997_battery_id,
170};
171
172static int __init max8997_battery_init(void)
173{
174 return platform_driver_register(&max8997_battery_driver);
175}
176subsys_initcall(max8997_battery_init);
177
178static void __exit max8997_battery_cleanup(void)
179{
180 platform_driver_unregister(&max8997_battery_driver);
181}
182module_exit(max8997_battery_cleanup);
183
184MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
185MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
186MODULE_LICENSE("GPL");
187
