2 * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
4 * Copyright (C) 2011 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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>
32 struct max8997_dev *iodev;
33 struct power_supply battery;
36 static enum power_supply_property max8997_battery_props[] = {
37 POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
38 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
39 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
42 /* Note that the charger control is done by a current regulator "CHARGER" */
43 static int max8997_battery_get_property(struct power_supply *psy,
44 enum power_supply_property psp,
45 union power_supply_propval *val)
47 struct charger_data *charger = container_of(psy,
48 struct charger_data, battery);
49 struct i2c_client *i2c = charger->iodev->i2c;
54 case POWER_SUPPLY_PROP_STATUS:
56 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
59 if ((reg & (1 << 0)) == 0x1)
60 val->intval = POWER_SUPPLY_STATUS_FULL;
63 case POWER_SUPPLY_PROP_PRESENT:
65 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
68 if ((reg & (1 << 2)) == 0x0)
72 case POWER_SUPPLY_PROP_ONLINE:
74 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
89 static __devinit int max8997_battery_probe(struct platform_device *pdev)
92 struct charger_data *charger;
93 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
94 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
100 u8 val = (pdata->eoc_mA - 50) / 10;
106 ret = max8997_update_reg(iodev->i2c,
107 MAX8997_REG_MBCCTRL5, val, 0xf);
109 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
114 switch (pdata->timeout) {
116 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
120 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
124 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
128 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
132 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
137 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
141 charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
142 if (charger == NULL) {
143 dev_err(&pdev->dev, "Cannot allocate memory.\n");
147 platform_set_drvdata(pdev, charger);
149 charger->battery.name = "max8997_pmic";
150 charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
151 charger->battery.get_property = max8997_battery_get_property;
152 charger->battery.properties = max8997_battery_props;
153 charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
155 charger->dev = &pdev->dev;
156 charger->iodev = iodev;
158 ret = power_supply_register(&pdev->dev, &charger->battery);
160 dev_err(&pdev->dev, "failed: power supply register\n");
170 static int __devexit max8997_battery_remove(struct platform_device *pdev)
172 struct charger_data *charger = platform_get_drvdata(pdev);
174 power_supply_unregister(&charger->battery);
179 static const struct platform_device_id max8997_battery_id[] = {
180 { "max8997-battery", 0 },
183 static struct platform_driver max8997_battery_driver = {
185 .name = "max8997-battery",
186 .owner = THIS_MODULE,
188 .probe = max8997_battery_probe,
189 .remove = __devexit_p(max8997_battery_remove),
190 .id_table = max8997_battery_id,
193 static int __init max8997_battery_init(void)
195 return platform_driver_register(&max8997_battery_driver);
197 subsys_initcall(max8997_battery_init);
199 static void __exit max8997_battery_cleanup(void)
201 platform_driver_unregister(&max8997_battery_driver);
203 module_exit(max8997_battery_cleanup);
205 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
206 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
207 MODULE_LICENSE("GPL");