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22#include <linux/err.h>
23#include <linux/module.h>
24#include <linux/slab.h>
25#include <linux/platform_device.h>
26#include <linux/power_supply.h>
27#include <linux/mfd/max8997.h>
28#include <linux/mfd/max8997-private.h>
29
30struct charger_data {
31 struct device *dev;
32 struct max8997_dev *iodev;
33 struct power_supply *battery;
34};
35
36static enum power_supply_property max8997_battery_props[] = {
37 POWER_SUPPLY_PROP_STATUS,
38 POWER_SUPPLY_PROP_PRESENT,
39 POWER_SUPPLY_PROP_ONLINE,
40};
41
42
43static int max8997_battery_get_property(struct power_supply *psy,
44 enum power_supply_property psp,
45 union power_supply_propval *val)
46{
47 struct charger_data *charger = power_supply_get_drvdata(psy);
48 struct i2c_client *i2c = charger->iodev->i2c;
49 int ret;
50 u8 reg;
51
52 switch (psp) {
53 case POWER_SUPPLY_PROP_STATUS:
54 val->intval = 0;
55 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
56 if (ret)
57 return ret;
58 if ((reg & (1 << 0)) == 0x1)
59 val->intval = POWER_SUPPLY_STATUS_FULL;
60
61 break;
62 case POWER_SUPPLY_PROP_PRESENT:
63 val->intval = 0;
64 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
65 if (ret)
66 return ret;
67 if ((reg & (1 << 2)) == 0x0)
68 val->intval = 1;
69
70 break;
71 case POWER_SUPPLY_PROP_ONLINE:
72 val->intval = 0;
73 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
74 if (ret)
75 return ret;
76
77 if (reg & (1 << 1))
78 val->intval = 1;
79
80 break;
81 default:
82 return -EINVAL;
83 }
84
85 return 0;
86}
87
88static const struct power_supply_desc max8997_battery_desc = {
89 .name = "max8997_pmic",
90 .type = POWER_SUPPLY_TYPE_BATTERY,
91 .get_property = max8997_battery_get_property,
92 .properties = max8997_battery_props,
93 .num_properties = ARRAY_SIZE(max8997_battery_props),
94};
95
96static int max8997_battery_probe(struct platform_device *pdev)
97{
98 int ret = 0;
99 struct charger_data *charger;
100 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
101 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
102 struct power_supply_config psy_cfg = {};
103
104 if (!pdata)
105 return -EINVAL;
106
107 if (pdata->eoc_mA) {
108 int val = (pdata->eoc_mA - 50) / 10;
109 if (val < 0)
110 val = 0;
111 if (val > 0xf)
112 val = 0xf;
113
114 ret = max8997_update_reg(iodev->i2c,
115 MAX8997_REG_MBCCTRL5, val, 0xf);
116 if (ret < 0) {
117 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
118 return ret;
119 }
120 }
121
122 switch (pdata->timeout) {
123 case 5:
124 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
125 0x2 << 4, 0x7 << 4);
126 break;
127 case 6:
128 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
129 0x3 << 4, 0x7 << 4);
130 break;
131 case 7:
132 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
133 0x4 << 4, 0x7 << 4);
134 break;
135 case 0:
136 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
137 0x7 << 4, 0x7 << 4);
138 break;
139 default:
140 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
141 pdata->timeout);
142 return -EINVAL;
143 }
144 if (ret < 0) {
145 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
146 return ret;
147 }
148
149 charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
150 GFP_KERNEL);
151 if (!charger)
152 return -ENOMEM;
153
154 platform_set_drvdata(pdev, charger);
155
156
157 charger->dev = &pdev->dev;
158 charger->iodev = iodev;
159
160 psy_cfg.drv_data = charger;
161
162 charger->battery = devm_power_supply_register(&pdev->dev,
163 &max8997_battery_desc,
164 &psy_cfg);
165 if (IS_ERR(charger->battery)) {
166 dev_err(&pdev->dev, "failed: power supply register\n");
167 return PTR_ERR(charger->battery);
168 }
169
170 return 0;
171}
172
173static const struct platform_device_id max8997_battery_id[] = {
174 { "max8997-battery", 0 },
175 { }
176};
177MODULE_DEVICE_TABLE(platform, max8997_battery_id);
178
179static struct platform_driver max8997_battery_driver = {
180 .driver = {
181 .name = "max8997-battery",
182 },
183 .probe = max8997_battery_probe,
184 .id_table = max8997_battery_id,
185};
186
187static int __init max8997_battery_init(void)
188{
189 return platform_driver_register(&max8997_battery_driver);
190}
191subsys_initcall(max8997_battery_init);
192
193static void __exit max8997_battery_cleanup(void)
194{
195 platform_driver_unregister(&max8997_battery_driver);
196}
197module_exit(max8997_battery_cleanup);
198
199MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
200MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
201MODULE_LICENSE("GPL");
202
