/* * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966 * * Copyright (C) 2011 Samsung Electronics * MyungJoo Ham <myungjoo.ham@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/err.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/mfd/max8997.h> #include <linux/mfd/max8997-private.h> struct charger_data { struct device *dev; struct max8997_dev *iodev; struct power_supply battery; }; static enum power_supply_property max8997_battery_props[] = { POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */ POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ }; /* Note that the charger control is done by a current regulator "CHARGER" */ static int max8997_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct charger_data *charger = container_of(psy, struct charger_data, battery); struct i2c_client *i2c = charger->iodev->i2c; int ret; u8 reg; switch (psp) { case POWER_SUPPLY_PROP_STATUS: val->intval = 0; ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); if (ret) return ret; if ((reg & (1 << 0)) == 0x1) val->intval = POWER_SUPPLY_STATUS_FULL; break; case POWER_SUPPLY_PROP_PRESENT: val->intval = 0; ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); if (ret) return ret; if ((reg & (1 << 2)) == 0x0) val->intval = 1; break; case POWER_SUPPLY_PROP_ONLINE: val->intval = 0; ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); if (ret) return ret; /* DCINOK */ if (reg & (1 << 1)) val->intval = 1; break; default: return -EINVAL; } return 0; } static __devinit int max8997_battery_probe(struct platform_device *pdev) { int ret = 0; struct charger_data *charger; struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev); if (!pdata) return -EINVAL; if (pdata->eoc_mA) { int val = (pdata->eoc_mA - 50) / 10; if (val < 0) val = 0; if (val > 0xf) val = 0xf; ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL5, val, 0xf); if (ret < 0) { dev_err(&pdev->dev, "Cannot use i2c bus.\n"); return ret; } } switch (pdata->timeout) { case 5: ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, 0x2 << 4, 0x7 << 4); break; case 6: ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, 0x3 << 4, 0x7 << 4); break; case 7: ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, 0x4 << 4, 0x7 << 4); break; case 0: ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, 0x7 << 4, 0x7 << 4); break; default: dev_err(&pdev->dev, "incorrect timeout value (%d)\n", pdata->timeout); return -EINVAL; } if (ret < 0) { dev_err(&pdev->dev, "Cannot use i2c bus.\n"); return ret; } charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL); if (charger == NULL) { dev_err(&pdev->dev, "Cannot allocate memory.\n"); return -ENOMEM; } platform_set_drvdata(pdev, charger); charger->battery.name = "max8997_pmic"; charger->battery.type = POWER_SUPPLY_TYPE_BATTERY; charger->battery.get_property = max8997_battery_get_property; charger->battery.properties = max8997_battery_props; charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props); charger->dev = &pdev->dev; charger->iodev = iodev; ret = power_supply_register(&pdev->dev, &charger->battery); if (ret) { dev_err(&pdev->dev, "failed: power supply register\n"); goto err; } return 0; err: kfree(charger); return ret; } static int __devexit max8997_battery_remove(struct platform_device *pdev) { struct charger_data *charger = platform_get_drvdata(pdev); power_supply_unregister(&charger->battery); kfree(charger); return 0; } static const struct platform_device_id max8997_battery_id[] = { { "max8997-battery", 0 }, { } }; static struct platform_driver max8997_battery_driver = { .driver = { .name = "max8997-battery", .owner = THIS_MODULE, }, .probe = max8997_battery_probe, .remove = __devexit_p(max8997_battery_remove), .id_table = max8997_battery_id, }; static int __init max8997_battery_init(void) { return platform_driver_register(&max8997_battery_driver); } subsys_initcall(max8997_battery_init); static void __exit max8997_battery_cleanup(void) { platform_driver_unregister(&max8997_battery_driver); } module_exit(max8997_battery_cleanup); MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver"); MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); MODULE_LICENSE("GPL");