max8998_charger.c

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/*
 * max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974
 *
 *  Copyright (C) 2009-2010 Samsung Electronics
 *  MyungJoo Ham <[email protected]>
 *
 * 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/max8998.h>
#include <linux/mfd/max8998-private.h>

struct max8998_battery_data {
    struct device *dev;
    struct max8998_dev *iodev;
    struct power_supply battery;
};

static enum power_supply_property max8998_battery_props[] = {
    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 max8998_battery_get_property(struct power_supply *psy,
        enum power_supply_property psp,
        union power_supply_propval *val)
{
    struct max8998_battery_data *max8998 = container_of(psy,
            struct max8998_battery_data, battery);
    struct i2c_client *i2c = max8998->iodev->i2c;
    int ret;
    u8 reg;

    switch (psp) {
    case POWER_SUPPLY_PROP_PRESENT:
        ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
        if (ret)
            return ret;
        if (reg & (1 << 4))
            val->intval = 0;
        else
            val->intval = 1;
        break;
    case POWER_SUPPLY_PROP_ONLINE:
        ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
        if (ret)
            return ret;
        if (reg & (1 << 3))
            val->intval = 0;
        else
            val->intval = 1;
        break;
    default:
        return -EINVAL;
    }

    return 0;
}

static __devinit int max8998_battery_probe(struct platform_device *pdev)
{
    struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
    struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
    struct max8998_battery_data *max8998;
    struct i2c_client *i2c;
    int ret = 0;

    if (!pdata) {
        dev_err(pdev->dev.parent, "No platform init data supplied\n");
        return -ENODEV;
    }

    max8998 = kzalloc(sizeof(struct max8998_battery_data), GFP_KERNEL);
    if (!max8998)
        return -ENOMEM;

    max8998->dev = &pdev->dev;
    max8998->iodev = iodev;
    platform_set_drvdata(pdev, max8998);
    i2c = max8998->iodev->i2c;

    /* Setup "End of Charge" */
    /* If EOC value equals 0,
     * remain value set from bootloader or default value */
    if (pdata->eoc >= 10 && pdata->eoc <= 45) {
        max8998_update_reg(i2c, MAX8998_REG_CHGR1,
                (pdata->eoc / 5 - 2) << 5, 0x7 << 5);
    } else if (pdata->eoc == 0) {
        dev_dbg(max8998->dev,
            "EOC value not set: leave it unchanged.\n");
    } else {
        dev_err(max8998->dev, "Invalid EOC value\n");
        ret = -EINVAL;
        goto err;
    }

    /* Setup Charge Restart Level */
    switch (pdata->restart) {
    case 100:
        max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
        break;
    case 150:
        max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
        break;
    case 200:
        max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
        break;
    case -1:
        max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
        break;
    case 0:
        dev_dbg(max8998->dev,
            "Restart Level not set: leave it unchanged.\n");
        break;
    default:
        dev_err(max8998->dev, "Invalid Restart Level\n");
        ret = -EINVAL;
        goto err;
    }

    /* Setup Charge Full Timeout */
    switch (pdata->timeout) {
    case 5:
        max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
        break;
    case 6:
        max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
        break;
    case 7:
        max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
        break;
    case -1:
        max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
        break;
    case 0:
        dev_dbg(max8998->dev,
            "Full Timeout not set: leave it unchanged.\n");
        break;
    default:
        dev_err(max8998->dev, "Invalid Full Timeout value\n");
        ret = -EINVAL;
        goto err;
    }

    max8998->battery.name = "max8998_pmic";
    max8998->battery.type = POWER_SUPPLY_TYPE_BATTERY;
    max8998->battery.get_property = max8998_battery_get_property;
    max8998->battery.properties = max8998_battery_props;
    max8998->battery.num_properties = ARRAY_SIZE(max8998_battery_props);

    ret = power_supply_register(max8998->dev, &max8998->battery);
    if (ret) {
        dev_err(max8998->dev, "failed: power supply register\n");
        goto err;
    }

    return 0;
err:
    kfree(max8998);
    return ret;
}

static int __devexit max8998_battery_remove(struct platform_device *pdev)
{
    struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);

    power_supply_unregister(&max8998->battery);
    kfree(max8998);

    return 0;
}

static const struct platform_device_id max8998_battery_id[] = {
    { "max8998-battery", TYPE_MAX8998 },
    { }
};

static struct platform_driver max8998_battery_driver = {
    .driver = {
        .name = "max8998-battery",
        .owner = THIS_MODULE,
    },
    .probe = max8998_battery_probe,
    .remove = __devexit_p(max8998_battery_remove),
    .id_table = max8998_battery_id,
};

module_platform_driver(max8998_battery_driver);

MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
MODULE_AUTHOR("MyungJoo Ham <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max8998-battery");