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* max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
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* Copyright (C) 2011 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/mfd/max8997.h>
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#include <linux/mfd/max8997-private.h>
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struct max8997_dev *iodev;
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struct power_supply battery;
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static enum power_supply_property max8997_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
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POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
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POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
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/* Note that the charger control is done by a current regulator "CHARGER" */
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static int max8997_battery_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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struct charger_data *charger = container_of(psy,
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struct charger_data, battery);
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struct i2c_client *i2c = charger->iodev->i2c;
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case POWER_SUPPLY_PROP_STATUS:
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ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
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if ((reg & (1 << 0)) == 0x1)
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val->intval = POWER_SUPPLY_STATUS_FULL;
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case POWER_SUPPLY_PROP_PRESENT:
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ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
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if ((reg & (1 << 2)) == 0x0)
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case POWER_SUPPLY_PROP_ONLINE:
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ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
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static __devinit int max8997_battery_probe(struct platform_device *pdev)
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struct charger_data *charger;
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struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
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u8 val = (pdata->eoc_mA - 50) / 10;
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ret = max8997_update_reg(iodev->i2c,
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MAX8997_REG_MBCCTRL5, val, 0xf);
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dev_err(&pdev->dev, "Cannot use i2c bus.\n");
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switch (pdata->timeout) {
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ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
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ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
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ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
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ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
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dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
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dev_err(&pdev->dev, "Cannot use i2c bus.\n");
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charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
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if (charger == NULL) {
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dev_err(&pdev->dev, "Cannot allocate memory.\n");
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platform_set_drvdata(pdev, charger);
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charger->battery.name = "max8997_pmic";
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charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
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charger->battery.get_property = max8997_battery_get_property;
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charger->battery.properties = max8997_battery_props;
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charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
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charger->dev = &pdev->dev;
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charger->iodev = iodev;
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ret = power_supply_register(&pdev->dev, &charger->battery);
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dev_err(&pdev->dev, "failed: power supply register\n");
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static int __devexit max8997_battery_remove(struct platform_device *pdev)
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struct charger_data *charger = platform_get_drvdata(pdev);
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power_supply_unregister(&charger->battery);
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static const struct platform_device_id max8997_battery_id[] = {
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{ "max8997-battery", 0 },
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static struct platform_driver max8997_battery_driver = {
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.name = "max8997-battery",
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.owner = THIS_MODULE,
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.probe = max8997_battery_probe,
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.remove = __devexit_p(max8997_battery_remove),
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.id_table = max8997_battery_id,
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static int __init max8997_battery_init(void)
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return platform_driver_register(&max8997_battery_driver);
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subsys_initcall(max8997_battery_init);
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static void __exit max8997_battery_cleanup(void)
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platform_driver_unregister(&max8997_battery_driver);
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module_exit(max8997_battery_cleanup);
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MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
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MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
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MODULE_LICENSE("GPL");