// SPDX-License-Identifier: GPL-2.0-only
/*
 * Battery driver for One Laptop Per Child board.
 *
 *      Copyright © 2006-2010  David Woodhouse <dwmw2@infradead.org>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/olpc-ec.h>


#define EC_BAT_VOLTAGE  0x10    /* uint16_t,    *9.76/32,    mV   */
#define EC_BAT_CURRENT  0x11    /* int16_t,     *15.625/120, mA   */
#define EC_BAT_ACR      0x12    /* int16_t,     *6250/15,    µAh  */
#define EC_BAT_TEMP     0x13    /* uint16_t,    *100/256,   °C  */
#define EC_AMB_TEMP     0x14    /* uint16_t,    *100/256,   °C  */
#define EC_BAT_STATUS   0x15    /* uint8_t,     bitmask */
#define EC_BAT_SOC      0x16    /* uint8_t,     percentage */
#define EC_BAT_SERIAL   0x17    /* uint8_t[6] */
#define EC_BAT_EEPROM   0x18    /* uint8_t adr as input, uint8_t output */
#define EC_BAT_ERRCODE  0x1f    /* uint8_t,     bitmask */

#define BAT_STAT_PRESENT        0x01
#define BAT_STAT_FULL           0x02
#define BAT_STAT_LOW            0x04
#define BAT_STAT_DESTROY        0x08
#define BAT_STAT_AC             0x10
#define BAT_STAT_CHARGING       0x20
#define BAT_STAT_DISCHARGING    0x40
#define BAT_STAT_TRICKLE        0x80

#define BAT_ERR_INFOFAIL        0x02
#define BAT_ERR_OVERVOLTAGE     0x04
#define BAT_ERR_OVERTEMP        0x05
#define BAT_ERR_GAUGESTOP       0x06
#define BAT_ERR_OUT_OF_CONTROL  0x07
#define BAT_ERR_ID_FAIL         0x09
#define BAT_ERR_ACR_FAIL        0x10

#define BAT_ADDR_MFR_TYPE       0x5F

struct olpc_battery_data {
        struct power_supply *olpc_ac;
        struct power_supply *olpc_bat;
        char bat_serial[17];
        bool new_proto;
        bool little_endian;
};

/*********************************************************************
 *              Power
 *********************************************************************/

static int olpc_ac_get_prop(struct power_supply *psy,
                            enum power_supply_property psp,
                            union power_supply_propval *val)
{
        int ret = 0;
        uint8_t status;

        switch (psp) {
        case POWER_SUPPLY_PROP_ONLINE:
                ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
                if (ret)
                        return ret;

                val->intval = !!(status & BAT_STAT_AC);
                break;
        default:
                ret = -EINVAL;
                break;
        }
        return ret;
}

static enum power_supply_property olpc_ac_props[] = {
        POWER_SUPPLY_PROP_ONLINE,
};

static const struct power_supply_desc olpc_ac_desc = {
        .name = "olpc_ac",
        .type = POWER_SUPPLY_TYPE_MAINS,
        .properties = olpc_ac_props,
        .num_properties = ARRAY_SIZE(olpc_ac_props),
        .get_property = olpc_ac_get_prop,
};

static int olpc_bat_get_status(struct olpc_battery_data *data,
                union power_supply_propval *val, uint8_t ec_byte)
{
        if (data->new_proto) {
                if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
                else if (ec_byte & BAT_STAT_DISCHARGING)
                        val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
                else if (ec_byte & BAT_STAT_FULL)
                        val->intval = POWER_SUPPLY_STATUS_FULL;
                else /* er,... */
                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
        } else {
                /* Older EC didn't report charge/discharge bits */
                if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
                        val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
                else if (ec_byte & BAT_STAT_FULL)
                        val->intval = POWER_SUPPLY_STATUS_FULL;
                else /* Not _necessarily_ true but EC doesn't tell all yet */
                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
        }

        return 0;
}

static int olpc_bat_get_health(union power_supply_propval *val)
{
        uint8_t ec_byte;
        int ret;

        ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
        if (ret)
                return ret;

        switch (ec_byte) {
        case 0:
                val->intval = POWER_SUPPLY_HEALTH_GOOD;
                break;

        case BAT_ERR_OVERTEMP:
                val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
                break;

        case BAT_ERR_OVERVOLTAGE:
                val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
                break;

        case BAT_ERR_INFOFAIL:
        case BAT_ERR_OUT_OF_CONTROL:
        case BAT_ERR_ID_FAIL:
        case BAT_ERR_ACR_FAIL:
                val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
                break;

        default:
                /* Eep. We don't know this failure code */
                ret = -EIO;
        }

        return ret;
}

static int olpc_bat_get_mfr(union power_supply_propval *val)
{
        uint8_t ec_byte;
        int ret;

        ec_byte = BAT_ADDR_MFR_TYPE;
        ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
        if (ret)
                return ret;

        switch (ec_byte >> 4) {
        case 1:
                val->strval = "Gold Peak";
                break;
        case 2:
                val->strval = "BYD";
                break;
        default:
                val->strval = "Unknown";
                break;
        }

        return ret;
}

static int olpc_bat_get_tech(union power_supply_propval *val)
{
        uint8_t ec_byte;
        int ret;

        ec_byte = BAT_ADDR_MFR_TYPE;
        ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
        if (ret)
                return ret;

        switch (ec_byte & 0xf) {
        case 1:
                val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
                break;
        case 2:
                val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
                break;
        default:
                val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
                break;
        }

        return ret;
}

static int olpc_bat_get_charge_full_design(union power_supply_propval *val)
{
        uint8_t ec_byte;
        union power_supply_propval tech;
        int ret, mfr;

        ret = olpc_bat_get_tech(&tech);
        if (ret)
                return ret;

        ec_byte = BAT_ADDR_MFR_TYPE;
        ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
        if (ret)
                return ret;

        mfr = ec_byte >> 4;

        switch (tech.intval) {
        case POWER_SUPPLY_TECHNOLOGY_NiMH:
                switch (mfr) {
                case 1: /* Gold Peak */
                        val->intval = 3000000*.8;
                        break;
                default:
                        return -EIO;
                }
                break;

        case POWER_SUPPLY_TECHNOLOGY_LiFe:
                switch (mfr) {
                case 1: /* Gold Peak, fall through */
                case 2: /* BYD */
                        val->intval = 2800000;
                        break;
                default:
                        return -EIO;
                }
                break;

        default:
                return -EIO;
        }

        return ret;
}

static int olpc_bat_get_charge_now(union power_supply_propval *val)
{
        uint8_t soc;
        union power_supply_propval full;
        int ret;

        ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1);
        if (ret)
                return ret;

        ret = olpc_bat_get_charge_full_design(&full);
        if (ret)
                return ret;

        val->intval = soc * (full.intval / 100);
        return 0;
}

static int olpc_bat_get_voltage_max_design(union power_supply_propval *val)
{
        uint8_t ec_byte;
        union power_supply_propval tech;
        int mfr;
        int ret;

        ret = olpc_bat_get_tech(&tech);
        if (ret)
                return ret;

        ec_byte = BAT_ADDR_MFR_TYPE;
        ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
        if (ret)
                return ret;

        mfr = ec_byte >> 4;

        switch (tech.intval) {
        case POWER_SUPPLY_TECHNOLOGY_NiMH:
                switch (mfr) {
                case 1: /* Gold Peak */
                        val->intval = 6000000;
                        break;
                default:
                        return -EIO;
                }
                break;

        case POWER_SUPPLY_TECHNOLOGY_LiFe:
                switch (mfr) {
                case 1: /* Gold Peak */
                        val->intval = 6400000;
                        break;
                case 2: /* BYD */
                        val->intval = 6500000;
                        break;
                default:
                        return -EIO;
                }
                break;

        default:
                return -EIO;
        }

        return ret;
}

static u16 ecword_to_cpu(struct olpc_battery_data *data, u16 ec_word)
{
        if (data->little_endian)
                return le16_to_cpu((__force __le16)ec_word);
        else
                return be16_to_cpu((__force __be16)ec_word);
}

/*********************************************************************
 *              Battery properties
 *********************************************************************/
static int olpc_bat_get_property(struct power_supply *psy,
                                 enum power_supply_property psp,
                                 union power_supply_propval *val)
{
        struct olpc_battery_data *data = power_supply_get_drvdata(psy);
        int ret = 0;
        u16 ec_word;
        uint8_t ec_byte;
        __be64 ser_buf;

        ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
        if (ret)
                return ret;

        /* Theoretically there's a race here -- the battery could be
           removed immediately after we check whether it's present, and
           then we query for some other property of the now-absent battery.
           It doesn't matter though -- the EC will return the last-known
           information, and it's as if we just ran that _little_ bit faster
           and managed to read it out before the battery went away. */
        if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) &&
                        psp != POWER_SUPPLY_PROP_PRESENT)
                return -ENODEV;

        switch (psp) {
        case POWER_SUPPLY_PROP_STATUS:
                ret = olpc_bat_get_status(data, val, ec_byte);
                if (ret)
                        return ret;
                break;
        case POWER_SUPPLY_PROP_CHARGE_TYPE:
                if (ec_byte & BAT_STAT_TRICKLE)
                        val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
                else if (ec_byte & BAT_STAT_CHARGING)
                        val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
                else
                        val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
                break;
        case POWER_SUPPLY_PROP_PRESENT:
                val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
                                            BAT_STAT_TRICKLE));
                break;

        case POWER_SUPPLY_PROP_HEALTH:
                if (ec_byte & BAT_STAT_DESTROY)
                        val->intval = POWER_SUPPLY_HEALTH_DEAD;
                else {
                        ret = olpc_bat_get_health(val);
                        if (ret)
                                return ret;
                }
                break;

        case POWER_SUPPLY_PROP_MANUFACTURER:
                ret = olpc_bat_get_mfr(val);
                if (ret)
                        return ret;
                break;
        case POWER_SUPPLY_PROP_TECHNOLOGY:
                ret = olpc_bat_get_tech(val);
                if (ret)
                        return ret;
                break;
        case POWER_SUPPLY_PROP_VOLTAGE_AVG:
        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
                ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
                if (ret)
                        return ret;

                val->intval = ecword_to_cpu(data, ec_word) * 9760L / 32;
                break;
        case POWER_SUPPLY_PROP_CURRENT_AVG:
        case POWER_SUPPLY_PROP_CURRENT_NOW:
                ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
                if (ret)
                        return ret;

                val->intval = ecword_to_cpu(data, ec_word) * 15625L / 120;
                break;
        case POWER_SUPPLY_PROP_CAPACITY:
                ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
                if (ret)
                        return ret;
                val->intval = ec_byte;
                break;
        case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
                if (ec_byte & BAT_STAT_FULL)
                        val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
                else if (ec_byte & BAT_STAT_LOW)
                        val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
                else
                        val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
                break;
        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
                ret = olpc_bat_get_charge_full_design(val);
                if (ret)
                        return ret;
                break;
        case POWER_SUPPLY_PROP_CHARGE_NOW:
                ret = olpc_bat_get_charge_now(val);
                if (ret)
                        return ret;
                break;
        case POWER_SUPPLY_PROP_TEMP:
                ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
                if (ret)
                        return ret;

                val->intval = ecword_to_cpu(data, ec_word) * 10 / 256;
                break;
        case POWER_SUPPLY_PROP_TEMP_AMBIENT:
                ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
                if (ret)
                        return ret;

                val->intval = (int)ecword_to_cpu(data, ec_word) * 10 / 256;
                break;
        case POWER_SUPPLY_PROP_CHARGE_COUNTER:
                ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
                if (ret)
                        return ret;

                val->intval = ecword_to_cpu(data, ec_word) * 6250 / 15;
                break;
        case POWER_SUPPLY_PROP_SERIAL_NUMBER:
                ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
                if (ret)
                        return ret;

                sprintf(data->bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
                val->strval = data->bat_serial;
                break;
        case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
                ret = olpc_bat_get_voltage_max_design(val);
                if (ret)
                        return ret;
                break;
        default:
                ret = -EINVAL;
                break;
        }

        return ret;
}

static enum power_supply_property olpc_xo1_bat_props[] = {
        POWER_SUPPLY_PROP_STATUS,
        POWER_SUPPLY_PROP_CHARGE_TYPE,
        POWER_SUPPLY_PROP_PRESENT,
        POWER_SUPPLY_PROP_HEALTH,
        POWER_SUPPLY_PROP_TECHNOLOGY,
        POWER_SUPPLY_PROP_VOLTAGE_AVG,
        POWER_SUPPLY_PROP_VOLTAGE_NOW,
        POWER_SUPPLY_PROP_CURRENT_AVG,
        POWER_SUPPLY_PROP_CURRENT_NOW,
        POWER_SUPPLY_PROP_CAPACITY,
        POWER_SUPPLY_PROP_CAPACITY_LEVEL,
        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
        POWER_SUPPLY_PROP_CHARGE_NOW,
        POWER_SUPPLY_PROP_TEMP,
        POWER_SUPPLY_PROP_TEMP_AMBIENT,
        POWER_SUPPLY_PROP_MANUFACTURER,
        POWER_SUPPLY_PROP_SERIAL_NUMBER,
        POWER_SUPPLY_PROP_CHARGE_COUNTER,
        POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
};

/* XO-1.5 does not have ambient temperature property */
static enum power_supply_property olpc_xo15_bat_props[] = {
        POWER_SUPPLY_PROP_STATUS,
        POWER_SUPPLY_PROP_CHARGE_TYPE,
        POWER_SUPPLY_PROP_PRESENT,
        POWER_SUPPLY_PROP_HEALTH,
        POWER_SUPPLY_PROP_TECHNOLOGY,
        POWER_SUPPLY_PROP_VOLTAGE_AVG,
        POWER_SUPPLY_PROP_VOLTAGE_NOW,
        POWER_SUPPLY_PROP_CURRENT_AVG,
        POWER_SUPPLY_PROP_CURRENT_NOW,
        POWER_SUPPLY_PROP_CAPACITY,
        POWER_SUPPLY_PROP_CAPACITY_LEVEL,
        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
        POWER_SUPPLY_PROP_CHARGE_NOW,
        POWER_SUPPLY_PROP_TEMP,
        POWER_SUPPLY_PROP_MANUFACTURER,
        POWER_SUPPLY_PROP_SERIAL_NUMBER,
        POWER_SUPPLY_PROP_CHARGE_COUNTER,
        POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
};

/* EEPROM reading goes completely around the power_supply API, sadly */

#define EEPROM_START    0x20
#define EEPROM_END      0x80
#define EEPROM_SIZE     (EEPROM_END - EEPROM_START)

static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj,
                const struct bin_attribute *attr, char *buf, loff_t off, size_t count)
{
        uint8_t ec_byte;
        int ret;
        int i;

        for (i = 0; i < count; i++) {
                ec_byte = EEPROM_START + off + i;
                ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1);
                if (ret) {
                        pr_err("olpc-battery: "
                               "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
                               ec_byte, ret);
                        return -EIO;
                }
        }

        return count;
}

static const struct bin_attribute olpc_bat_eeprom = {
        .attr = {
                .name = "eeprom",
                .mode = S_IRUGO,
        },
        .size = EEPROM_SIZE,
        .read = olpc_bat_eeprom_read,
};

/* Allow userspace to see the specific error value pulled from the EC */

static ssize_t olpc_bat_error_read(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        uint8_t ec_byte;
        ssize_t ret;

        ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
        if (ret < 0)
                return ret;

        return sysfs_emit(buf, "%d\n", ec_byte);
}

static struct device_attribute olpc_bat_error = {
        .attr = {
                .name = "error",
                .mode = S_IRUGO,
        },
        .show = olpc_bat_error_read,
};

static struct attribute *olpc_bat_sysfs_attrs[] = {
        &olpc_bat_error.attr,
        NULL
};

static const struct bin_attribute *const olpc_bat_sysfs_bin_attrs[] = {
        &olpc_bat_eeprom,
        NULL
};

static const struct attribute_group olpc_bat_sysfs_group = {
        .attrs = olpc_bat_sysfs_attrs,
        .bin_attrs = olpc_bat_sysfs_bin_attrs,
};

static const struct attribute_group *olpc_bat_sysfs_groups[] = {
        &olpc_bat_sysfs_group,
        NULL
};

/*********************************************************************
 *              Initialisation
 *********************************************************************/

static struct power_supply_desc olpc_bat_desc = {
        .name = "olpc_battery",
        .get_property = olpc_bat_get_property,
        .use_for_apm = 1,
};

static int olpc_battery_suspend(struct platform_device *pdev,
                                pm_message_t state)
{
        struct olpc_battery_data *data = platform_get_drvdata(pdev);

        if (device_may_wakeup(&data->olpc_ac->dev))
                olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR);
        else
                olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR);

        if (device_may_wakeup(&data->olpc_bat->dev))
                olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
                                   | EC_SCI_SRC_BATERR);
        else
                olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
                                     | EC_SCI_SRC_BATERR);

        return 0;
}

static int olpc_battery_probe(struct platform_device *pdev)
{
        struct power_supply_config bat_psy_cfg = {};
        struct power_supply_config ac_psy_cfg = {};
        struct olpc_battery_data *data;
        struct device_node *np;
        uint8_t status;
        uint8_t ecver;
        int ret;

        data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;
        platform_set_drvdata(pdev, data);

        /* See if the EC is already there and get the EC revision */
        ret = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ecver, 1);
        if (ret)
                return ret;

        np = of_find_compatible_node(NULL, NULL, "olpc,xo1.75-ec");
        if (np) {
                of_node_put(np);
                /* XO 1.75 */
                data->new_proto = true;
                data->little_endian = true;
        } else if (ecver > 0x44) {
                /* XO 1 or 1.5 with a new EC firmware. */
                data->new_proto = true;
        } else if (ecver < 0x44) {
                /*
                 * We've seen a number of EC protocol changes; this driver
                 * requires the latest EC protocol, supported by 0x44 and above.
                 */
                printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
                        "battery driver.\n", ecver);
                return -ENXIO;
        }

        ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
        if (ret)
                return ret;

        /* Ignore the status. It doesn't actually matter */

        ac_psy_cfg.fwnode = dev_fwnode(&pdev->dev);
        ac_psy_cfg.drv_data = data;

        data->olpc_ac = devm_power_supply_register(&pdev->dev, &olpc_ac_desc,
                                                                &ac_psy_cfg);
        if (IS_ERR(data->olpc_ac))
                return PTR_ERR(data->olpc_ac);

        if (of_device_is_compatible(pdev->dev.of_node, "olpc,xo1.5-battery")) {
                /* XO-1.5 */
                olpc_bat_desc.properties = olpc_xo15_bat_props;
                olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
        } else {
                /* XO-1 */
                olpc_bat_desc.properties = olpc_xo1_bat_props;
                olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
        }

        bat_psy_cfg.fwnode = dev_fwnode(&pdev->dev);
        bat_psy_cfg.drv_data = data;
        bat_psy_cfg.attr_grp = olpc_bat_sysfs_groups;

        data->olpc_bat = devm_power_supply_register(&pdev->dev, &olpc_bat_desc,
                                                                &bat_psy_cfg);
        if (IS_ERR(data->olpc_bat))
                return PTR_ERR(data->olpc_bat);

        if (olpc_ec_wakeup_available()) {
                device_set_wakeup_capable(&data->olpc_ac->dev, true);
                device_set_wakeup_capable(&data->olpc_bat->dev, true);
        }

        return 0;
}

static const struct of_device_id olpc_battery_ids[] = {
        { .compatible = "olpc,xo1-battery" },
        { .compatible = "olpc,xo1.5-battery" },
        {}
};
MODULE_DEVICE_TABLE(of, olpc_battery_ids);

static struct platform_driver olpc_battery_driver = {
        .driver = {
                .name = "olpc-battery",
                .of_match_table = olpc_battery_ids,
        },
        .probe = olpc_battery_probe,
        .suspend = olpc_battery_suspend,
};

module_platform_driver(olpc_battery_driver);

MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");