2 * max8997.c - Power supply consumer driver for the Maxim 8998
4 * Copyright (C) 2009-2010 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 * This program is not provided / owned by Maxim Integrated Products.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/err.h>
25 #include <linux/slab.h>
26 #include <linux/platform_device.h>
27 #include <linux/power_supply.h>
28 #include <linux/mfd/max8997.h>
29 #include <linux/mfd/max8997-private.h>
31 /* TODO: implement eoc based on ratio */
35 struct max8997_dev *iodev;
36 struct power_supply battery;
39 static enum power_supply_property max8997_battery_props[] = {
40 POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
41 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
42 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
45 /* Note that the charger control is done by a current regulator "CHARGER" */
46 static int max8997_battery_get_property(struct power_supply *psy,
47 enum power_supply_property psp,
48 union power_supply_propval *val)
50 struct charger_data *charger = container_of(psy,
51 struct charger_data, battery);
52 struct i2c_client *i2c = charger->iodev->i2c;
57 case POWER_SUPPLY_PROP_STATUS:
59 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
63 if ((reg & (1 << 0)) == 0x1)
64 val->intval = POWER_SUPPLY_STATUS_FULL;
65 else if ((reg & (1 << 1)) && !(reg & (1 << 2)) &&
66 (reg & (1 << 3)) && (reg & (3 << 4)) &&
68 val->intval = POWER_SUPPLY_STATUS_CHARGING;
69 else if ((reg & (1 << 1)) && !(reg & (1 << 6)))
70 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
72 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
75 case POWER_SUPPLY_PROP_PRESENT:
77 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
80 if ((reg & (1 << 2)) == 0x0)
84 case POWER_SUPPLY_PROP_ONLINE:
86 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
102 static __devinit int max8997_battery_probe(struct platform_device *pdev)
105 struct charger_data *charger;
106 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
107 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
113 u8 val = (pdata->eoc_mA - 50) / 10;
119 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL5, val, 0xf);
121 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
125 pdata->eoc_ratio = 0; /* Ratio is ignored if mA is available */
128 switch (pdata->timeout) {
130 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
134 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
138 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
142 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
146 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
151 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
155 charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
156 if (charger == NULL) {
157 dev_err(&pdev->dev, "Cannot allocate memory.\n");
161 platform_set_drvdata(pdev, charger);
163 charger->battery.name = "max8997_pmic";
164 charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
165 charger->battery.get_property = max8997_battery_get_property;
166 charger->battery.properties = max8997_battery_props;
167 charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
169 charger->dev = &pdev->dev;
170 charger->iodev = iodev;
172 ret = power_supply_register(&pdev->dev, &charger->battery);
174 dev_err(&pdev->dev, "failed: power supply register\n");
184 static int __devexit max8997_battery_remove(struct platform_device *pdev)
186 struct charger_data *charger = platform_get_drvdata(pdev);
188 power_supply_unregister(&charger->battery);
193 static const struct platform_device_id max8997_battery_id[] = {
194 { "max8997-battery", 0 },
197 static struct platform_driver max8997_battery_driver = {
199 .name = "max8997-battery",
200 .owner = THIS_MODULE,
202 .probe = max8997_battery_probe,
203 .remove = __devexit_p(max8997_battery_remove),
204 .id_table = max8997_battery_id,
207 static int __init max8997_battery_init(void)
209 return platform_driver_register(&max8997_battery_driver);
211 subsys_initcall(max8997_battery_init);
213 static void __exit max8997_battery_cleanup(void)
215 platform_driver_unregister(&max8997_battery_driver);
217 module_exit(max8997_battery_cleanup);
219 MODULE_DESCRIPTION("MAXIM 8997 battery control driver");
220 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
221 MODULE_LICENSE("GPL");