| /* |
| * 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 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 = devm_kzalloc(&pdev->dev, 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, NULL); |
| if (ret) { |
| dev_err(&pdev->dev, "failed: power supply register\n"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int max8997_battery_remove(struct platform_device *pdev) |
| { |
| struct charger_data *charger = platform_get_drvdata(pdev); |
| |
| power_supply_unregister(&charger->battery); |
| 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", |
| }, |
| .probe = max8997_battery_probe, |
| .remove = 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"); |