2 * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
4 * Copyright (C) 2011 Samsung Electronics
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 = power_supply_get_drvdata(psy);
48 struct i2c_client *i2c = charger->iodev->i2c;
53 case POWER_SUPPLY_PROP_STATUS:
55 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
58 if ((reg & (1 << 0)) == 0x1)
59 val->intval = POWER_SUPPLY_STATUS_FULL;
62 case POWER_SUPPLY_PROP_PRESENT:
64 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
67 if ((reg & (1 << 2)) == 0x0)
71 case POWER_SUPPLY_PROP_ONLINE:
73 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
88 static 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),
96 static int max8997_battery_probe(struct platform_device *pdev)
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 = {};
108 int val = (pdata->eoc_mA - 50) / 10;
114 ret = max8997_update_reg(iodev->i2c,
115 MAX8997_REG_MBCCTRL5, val, 0xf);
117 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
122 switch (pdata->timeout) {
124 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
128 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
132 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
136 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
140 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
145 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
149 charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
151 if (charger == NULL) {
152 dev_err(&pdev->dev, "Cannot allocate memory.\n");
156 platform_set_drvdata(pdev, charger);
159 charger->dev = &pdev->dev;
160 charger->iodev = iodev;
162 psy_cfg.drv_data = charger;
164 charger->battery = power_supply_register(&pdev->dev,
165 &max8997_battery_desc,
167 if (IS_ERR(charger->battery)) {
168 dev_err(&pdev->dev, "failed: power supply register\n");
169 return PTR_ERR(charger->battery);
175 static int max8997_battery_remove(struct platform_device *pdev)
177 struct charger_data *charger = platform_get_drvdata(pdev);
179 power_supply_unregister(charger->battery);
183 static const struct platform_device_id max8997_battery_id[] = {
184 { "max8997-battery", 0 },
188 static struct platform_driver max8997_battery_driver = {
190 .name = "max8997-battery",
192 .probe = max8997_battery_probe,
193 .remove = max8997_battery_remove,
194 .id_table = max8997_battery_id,
197 static int __init max8997_battery_init(void)
199 return platform_driver_register(&max8997_battery_driver);
201 subsys_initcall(max8997_battery_init);
203 static void __exit max8997_battery_cleanup(void)
205 platform_driver_unregister(&max8997_battery_driver);
207 module_exit(max8997_battery_cleanup);
209 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
211 MODULE_LICENSE("GPL");