// SPDX-License-Identifier: GPL-2.0+
/*
 * Power supply driver for the RICOH RN5T618 power management chip family
 *
 * Copyright (C) 2020 Andreas Kemnade
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/iio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mfd/rn5t618.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#define CHG_STATE_ADP_INPUT 0x40
#define CHG_STATE_USB_INPUT 0x80
#define CHG_STATE_MASK  0x1f
#define CHG_STATE_CHG_OFF       0
#define CHG_STATE_CHG_READY_VADP        1
#define CHG_STATE_CHG_TRICKLE   2
#define CHG_STATE_CHG_RAPID     3
#define CHG_STATE_CHG_COMPLETE  4
#define CHG_STATE_SUSPEND       5
#define CHG_STATE_VCHG_OVER_VOL 6
#define CHG_STATE_BAT_ERROR     7
#define CHG_STATE_NO_BAT        8
#define CHG_STATE_BAT_OVER_VOL  9
#define CHG_STATE_BAT_TEMP_ERR  10
#define CHG_STATE_DIE_ERR       11
#define CHG_STATE_DIE_SHUTDOWN  12
#define CHG_STATE_NO_BAT2       13
#define CHG_STATE_CHG_READY_VUSB        14

#define GCHGDET_TYPE_MASK 0x30
#define GCHGDET_TYPE_SDP 0x00
#define GCHGDET_TYPE_CDP 0x10
#define GCHGDET_TYPE_DCP 0x20

#define FG_ENABLE 1

/*
 * Formula seems accurate for battery current, but for USB current around 70mA
 * per step was seen on Kobo Clara HD but all sources show the same formula
 * also fur USB current. To avoid accidentially unwanted high currents we stick
 * to that formula
 */
#define TO_CUR_REG(x) ((x) / 100000 - 1)
#define FROM_CUR_REG(x) ((((x) & 0x1f) + 1) * 100000)
#define CHG_MIN_CUR 100000
#define CHG_MAX_CUR 1800000
#define ADP_MAX_CUR 2500000
#define USB_MAX_CUR 1400000


struct rn5t618_power_info {
        struct rn5t618 *rn5t618;
        struct platform_device *pdev;
        struct power_supply *battery;
        struct power_supply *usb;
        struct power_supply *adp;
        struct iio_channel *channel_vusb;
        struct iio_channel *channel_vadp;
        int irq;
};

static enum power_supply_property rn5t618_usb_props[] = {
        /* input current limit is not very accurate */
        POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
        POWER_SUPPLY_PROP_VOLTAGE_NOW,
        POWER_SUPPLY_PROP_STATUS,
        POWER_SUPPLY_PROP_USB_TYPE,
        POWER_SUPPLY_PROP_ONLINE,
};

static enum power_supply_property rn5t618_adp_props[] = {
        /* input current limit is not very accurate */
        POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
        POWER_SUPPLY_PROP_VOLTAGE_NOW,
        POWER_SUPPLY_PROP_STATUS,
        POWER_SUPPLY_PROP_ONLINE,
};


static enum power_supply_property rn5t618_battery_props[] = {
        POWER_SUPPLY_PROP_STATUS,
        POWER_SUPPLY_PROP_PRESENT,
        POWER_SUPPLY_PROP_VOLTAGE_NOW,
        POWER_SUPPLY_PROP_CURRENT_NOW,
        POWER_SUPPLY_PROP_CAPACITY,
        POWER_SUPPLY_PROP_TEMP,
        POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
        POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
        POWER_SUPPLY_PROP_TECHNOLOGY,
        POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
        POWER_SUPPLY_PROP_CHARGE_FULL,
        POWER_SUPPLY_PROP_CHARGE_NOW,
};

static int rn5t618_battery_read_doublereg(struct rn5t618_power_info *info,
                                          u8 reg, u16 *result)
{
        int ret, i;
        u8 data[2];
        u16 old, new;

        old = 0;
        /* Prevent races when registers are changing. */
        for (i = 0; i < 3; i++) {
                ret = regmap_bulk_read(info->rn5t618->regmap,
                                       reg, data, sizeof(data));
                if (ret)
                        return ret;

                new = data[0] << 8;
                new |= data[1];
                if (new == old)
                        break;

                old = new;
        }

        *result = new;

        return 0;
}

static int rn5t618_decode_status(unsigned int status)
{
        switch (status & CHG_STATE_MASK) {
        case CHG_STATE_CHG_OFF:
        case CHG_STATE_SUSPEND:
        case CHG_STATE_VCHG_OVER_VOL:
        case CHG_STATE_DIE_SHUTDOWN:
                return POWER_SUPPLY_STATUS_DISCHARGING;

        case CHG_STATE_CHG_TRICKLE:
        case CHG_STATE_CHG_RAPID:
                return POWER_SUPPLY_STATUS_CHARGING;

        case CHG_STATE_CHG_COMPLETE:
                return POWER_SUPPLY_STATUS_FULL;

        default:
                return POWER_SUPPLY_STATUS_NOT_CHARGING;
        }
}

static int rn5t618_battery_status(struct rn5t618_power_info *info,
                                  union power_supply_propval *val)
{
        unsigned int v;
        int ret;

        ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
        if (ret)
                return ret;

        val->intval = POWER_SUPPLY_STATUS_UNKNOWN;

        if (v & 0xc0) { /* USB or ADP plugged */
                val->intval = rn5t618_decode_status(v);
        } else
                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;

        return ret;
}

static int rn5t618_battery_present(struct rn5t618_power_info *info,
                                   union power_supply_propval *val)
{
        unsigned int v;
        int ret;

        ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
        if (ret)
                return ret;

        v &= CHG_STATE_MASK;
        if ((v == CHG_STATE_NO_BAT) || (v == CHG_STATE_NO_BAT2))
                val->intval = 0;
        else
                val->intval = 1;

        return ret;
}

static int rn5t618_battery_voltage_now(struct rn5t618_power_info *info,
                                       union power_supply_propval *val)
{
        u16 res;
        int ret;

        ret = rn5t618_battery_read_doublereg(info, RN5T618_VOLTAGE_1, &res);
        if (ret)
                return ret;

        val->intval = res * 2 * 2500 / 4095 * 1000;

        return 0;
}

static int rn5t618_battery_current_now(struct rn5t618_power_info *info,
                                       union power_supply_propval *val)
{
        u16 res;
        int ret;

        ret = rn5t618_battery_read_doublereg(info, RN5T618_CC_AVEREG1, &res);
        if (ret)
                return ret;

        /* current is negative when discharging */
        val->intval = sign_extend32(res, 13) * 1000;

        return 0;
}

static int rn5t618_battery_capacity(struct rn5t618_power_info *info,
                                    union power_supply_propval *val)
{
        unsigned int v;
        int ret;

        ret = regmap_read(info->rn5t618->regmap, RN5T618_SOC, &v);
        if (ret)
                return ret;

        val->intval = v;

        return 0;
}

static int rn5t618_battery_temp(struct rn5t618_power_info *info,
                                union power_supply_propval *val)
{
        u16 res;
        int ret;

        ret = rn5t618_battery_read_doublereg(info, RN5T618_TEMP_1, &res);
        if (ret)
                return ret;

        val->intval = sign_extend32(res, 11) * 10 / 16;

        return 0;
}

static int rn5t618_battery_tte(struct rn5t618_power_info *info,
                               union power_supply_propval *val)
{
        u16 res;
        int ret;

        ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_EMPTY_H, &res);
        if (ret)
                return ret;

        if (res == 65535)
                return -ENODATA;

        val->intval = res * 60;

        return 0;
}

static int rn5t618_battery_ttf(struct rn5t618_power_info *info,
                               union power_supply_propval *val)
{
        u16 res;
        int ret;

        ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_FULL_H, &res);
        if (ret)
                return ret;

        if (res == 65535)
                return -ENODATA;

        val->intval = res * 60;

        return 0;
}

static int rn5t618_battery_set_current_limit(struct rn5t618_power_info *info,
                                const union power_supply_propval *val)
{
        if (val->intval < CHG_MIN_CUR)
                return -EINVAL;

        if (val->intval >= CHG_MAX_CUR)
                return -EINVAL;

        return regmap_update_bits(info->rn5t618->regmap,
                                  RN5T618_CHGISET,
                                  0x1F, TO_CUR_REG(val->intval));
}

static int rn5t618_battery_get_current_limit(struct rn5t618_power_info *info,
                                             union power_supply_propval *val)
{
        unsigned int regval;
        int ret;

        ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGISET,
                          &regval);
        if (ret < 0)
                return ret;

        val->intval = FROM_CUR_REG(regval);

        return 0;
}

static int rn5t618_battery_charge_full(struct rn5t618_power_info *info,
                                       union power_supply_propval *val)
{
        u16 res;
        int ret;

        ret = rn5t618_battery_read_doublereg(info, RN5T618_FA_CAP_H, &res);
        if (ret)
                return ret;

        val->intval = res * 1000;

        return 0;
}

static int rn5t618_battery_charge_now(struct rn5t618_power_info *info,
                                      union power_supply_propval *val)
{
        u16 res;
        int ret;

        ret = rn5t618_battery_read_doublereg(info, RN5T618_RE_CAP_H, &res);
        if (ret)
                return ret;

        val->intval = res * 1000;

        return 0;
}

static int rn5t618_battery_get_property(struct power_supply *psy,
                                        enum power_supply_property psp,
                                        union power_supply_propval *val)
{
        int ret = 0;
        struct rn5t618_power_info *info = power_supply_get_drvdata(psy);

        switch (psp) {
        case POWER_SUPPLY_PROP_STATUS:
                ret = rn5t618_battery_status(info, val);
                break;
        case POWER_SUPPLY_PROP_PRESENT:
                ret = rn5t618_battery_present(info, val);
                break;
        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
                ret = rn5t618_battery_voltage_now(info, val);
                break;
        case POWER_SUPPLY_PROP_CURRENT_NOW:
                ret = rn5t618_battery_current_now(info, val);
                break;
        case POWER_SUPPLY_PROP_CAPACITY:
                ret = rn5t618_battery_capacity(info, val);
                break;
        case POWER_SUPPLY_PROP_TEMP:
                ret = rn5t618_battery_temp(info, val);
                break;
        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
                ret = rn5t618_battery_tte(info, val);
                break;
        case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
                ret = rn5t618_battery_ttf(info, val);
                break;
        case POWER_SUPPLY_PROP_TECHNOLOGY:
                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
                break;
        case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
                ret = rn5t618_battery_get_current_limit(info, val);
                break;
        case POWER_SUPPLY_PROP_CHARGE_FULL:
                ret = rn5t618_battery_charge_full(info, val);
                break;
        case POWER_SUPPLY_PROP_CHARGE_NOW:
                ret = rn5t618_battery_charge_now(info, val);
                break;
        default:
                return -EINVAL;
        }

        return ret;
}

static int rn5t618_battery_set_property(struct power_supply *psy,
                                        enum power_supply_property psp,
                                        const union power_supply_propval *val)
{
        struct rn5t618_power_info *info = power_supply_get_drvdata(psy);

        switch (psp) {
        case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
                return rn5t618_battery_set_current_limit(info, val);
        default:
                return -EINVAL;
        }
}

static int rn5t618_battery_property_is_writeable(struct power_supply *psy,
                                                enum power_supply_property psp)
{
        switch (psp) {
        case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
                return true;
        default:
                return false;
        }
}

static int rn5t618_adp_get_property(struct power_supply *psy,
                                    enum power_supply_property psp,
                                    union power_supply_propval *val)
{
        struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
        unsigned int chgstate;
        unsigned int regval;
        bool online;
        int ret;

        ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
        if (ret)
                return ret;

        online = !!(chgstate & CHG_STATE_ADP_INPUT);

        switch (psp) {
        case POWER_SUPPLY_PROP_ONLINE:
                val->intval = online;
                break;
        case POWER_SUPPLY_PROP_STATUS:
                if (!online) {
                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
                        break;
                }
                val->intval = rn5t618_decode_status(chgstate);
                if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;

                break;
        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
                ret = regmap_read(info->rn5t618->regmap,
                                  RN5T618_REGISET1, &regval);
                if (ret < 0)
                        return ret;

                val->intval = FROM_CUR_REG(regval);
                break;
        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
                if (!info->channel_vadp)
                        return -ENODATA;

                ret = iio_read_channel_processed_scale(info->channel_vadp, &val->intval, 1000);
                if (ret < 0)
                        return ret;

                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int rn5t618_adp_set_property(struct power_supply *psy,
                                    enum power_supply_property psp,
                                    const union power_supply_propval *val)
{
        struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
        int ret;

        switch (psp) {
        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
                if (val->intval > ADP_MAX_CUR)
                        return -EINVAL;

                if (val->intval < CHG_MIN_CUR)
                        return -EINVAL;

                ret = regmap_write(info->rn5t618->regmap, RN5T618_REGISET1,
                                   TO_CUR_REG(val->intval));
                if (ret < 0)
                        return ret;

                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int rn5t618_adp_property_is_writeable(struct power_supply *psy,
                                             enum power_supply_property psp)
{
        switch (psp) {
        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
                return true;
        default:
                return false;
        }
}

static int rc5t619_usb_get_type(struct rn5t618_power_info *info,
                                union power_supply_propval *val)
{
        unsigned int regval;
        int ret;

        ret = regmap_read(info->rn5t618->regmap, RN5T618_GCHGDET, &regval);
        if (ret < 0)
                return ret;

        switch (regval & GCHGDET_TYPE_MASK) {
        case GCHGDET_TYPE_SDP:
                val->intval = POWER_SUPPLY_USB_TYPE_SDP;
                break;
        case GCHGDET_TYPE_CDP:
                val->intval = POWER_SUPPLY_USB_TYPE_CDP;
                break;
        case GCHGDET_TYPE_DCP:
                val->intval = POWER_SUPPLY_USB_TYPE_DCP;
                break;
        default:
                val->intval = POWER_SUPPLY_USB_TYPE_UNKNOWN;
        }

        return 0;
}

static int rn5t618_usb_get_property(struct power_supply *psy,
                                    enum power_supply_property psp,
                                    union power_supply_propval *val)
{
        struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
        unsigned int chgstate;
        unsigned int regval;
        bool online;
        int ret;

        ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
        if (ret)
                return ret;

        online = !!(chgstate & CHG_STATE_USB_INPUT);

        switch (psp) {
        case POWER_SUPPLY_PROP_ONLINE:
                val->intval = online;
                break;
        case POWER_SUPPLY_PROP_STATUS:
                if (!online) {
                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
                        break;
                }
                val->intval = rn5t618_decode_status(chgstate);
                if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;

                break;
        case POWER_SUPPLY_PROP_USB_TYPE:
                if (!online || (info->rn5t618->variant != RC5T619))
                        return -ENODATA;

                return rc5t619_usb_get_type(info, val);
        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
                ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGCTL1,
                                  &regval);
                if (ret < 0)
                        return ret;

                val->intval = 0;
                if (regval & 2) {
                        ret = regmap_read(info->rn5t618->regmap,
                                          RN5T618_REGISET2,
                                          &regval);
                        if (ret < 0)
                                return ret;

                        val->intval = FROM_CUR_REG(regval);
                }
                break;
        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
                if (!info->channel_vusb)
                        return -ENODATA;

                ret = iio_read_channel_processed_scale(info->channel_vusb, &val->intval, 1000);
                if (ret < 0)
                        return ret;

                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int rn5t618_usb_set_property(struct power_supply *psy,
                                    enum power_supply_property psp,
                                    const union power_supply_propval *val)
{
        struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
        int ret;

        switch (psp) {
        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
                if (val->intval > USB_MAX_CUR)
                        return -EINVAL;

                if (val->intval < CHG_MIN_CUR)
                        return -EINVAL;

                ret = regmap_write(info->rn5t618->regmap, RN5T618_REGISET2,
                                   0xE0 | TO_CUR_REG(val->intval));
                if (ret < 0)
                        return ret;

                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int rn5t618_usb_property_is_writeable(struct power_supply *psy,
                                             enum power_supply_property psp)
{
        switch (psp) {
        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
                return true;
        default:
                return false;
        }
}

static const struct power_supply_desc rn5t618_battery_desc = {
        .name                   = "rn5t618-battery",
        .type                   = POWER_SUPPLY_TYPE_BATTERY,
        .properties             = rn5t618_battery_props,
        .num_properties         = ARRAY_SIZE(rn5t618_battery_props),
        .get_property           = rn5t618_battery_get_property,
        .set_property           = rn5t618_battery_set_property,
        .property_is_writeable  = rn5t618_battery_property_is_writeable,
};

static const struct power_supply_desc rn5t618_adp_desc = {
        .name                   = "rn5t618-adp",
        .type                   = POWER_SUPPLY_TYPE_MAINS,
        .properties             = rn5t618_adp_props,
        .num_properties         = ARRAY_SIZE(rn5t618_adp_props),
        .get_property           = rn5t618_adp_get_property,
        .set_property           = rn5t618_adp_set_property,
        .property_is_writeable  = rn5t618_adp_property_is_writeable,
};

static const struct power_supply_desc rn5t618_usb_desc = {
        .name                   = "rn5t618-usb",
        .type                   = POWER_SUPPLY_TYPE_USB,
        .usb_types              = BIT(POWER_SUPPLY_USB_TYPE_SDP) |
                                  BIT(POWER_SUPPLY_USB_TYPE_CDP) |
                                  BIT(POWER_SUPPLY_USB_TYPE_DCP) |
                                  BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN),
        .properties             = rn5t618_usb_props,
        .num_properties         = ARRAY_SIZE(rn5t618_usb_props),
        .get_property           = rn5t618_usb_get_property,
        .set_property           = rn5t618_usb_set_property,
        .property_is_writeable  = rn5t618_usb_property_is_writeable,
};

static irqreturn_t rn5t618_charger_irq(int irq, void *data)
{
        struct device *dev = data;
        struct rn5t618_power_info *info = dev_get_drvdata(dev);

        unsigned int ctrl, stat1, stat2, err;

        regmap_read(info->rn5t618->regmap, RN5T618_CHGERR_IRR, &err);
        regmap_read(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, &ctrl);
        regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, &stat1);
        regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, &stat2);

        regmap_write(info->rn5t618->regmap, RN5T618_CHGERR_IRR, 0);
        regmap_write(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, 0);
        regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, 0);
        regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, 0);

        dev_dbg(dev, "chgerr: %x chgctrl: %x chgstat: %x chgstat2: %x\n",
                err, ctrl, stat1, stat2);

        power_supply_changed(info->usb);
        power_supply_changed(info->adp);
        power_supply_changed(info->battery);

        return IRQ_HANDLED;
}

static int rn5t618_power_probe(struct platform_device *pdev)
{
        int ret = 0;
        unsigned int v;
        struct power_supply_config psy_cfg = {};
        struct rn5t618_power_info *info;

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

        info->pdev = pdev;
        info->rn5t618 = dev_get_drvdata(pdev->dev.parent);
        info->irq = -1;

        platform_set_drvdata(pdev, info);

        info->channel_vusb = devm_iio_channel_get(&pdev->dev, "vusb");
        if (IS_ERR(info->channel_vusb)) {
                if (PTR_ERR(info->channel_vusb) == -ENODEV)
                        return -EPROBE_DEFER;
                return PTR_ERR(info->channel_vusb);
        }

        info->channel_vadp = devm_iio_channel_get(&pdev->dev, "vadp");
        if (IS_ERR(info->channel_vadp)) {
                if (PTR_ERR(info->channel_vadp) == -ENODEV)
                        return -EPROBE_DEFER;
                return PTR_ERR(info->channel_vadp);
        }

        ret = regmap_read(info->rn5t618->regmap, RN5T618_CONTROL, &v);
        if (ret)
                return ret;

        if (!(v & FG_ENABLE)) {
                /* E.g. the vendor kernels of various Kobo and Tolino Ebook
                 * readers disable the fuel gauge on shutdown. If a kernel
                 * without fuel gauge support is booted after that, the fuel
                 * gauge will get decalibrated.
                 */
                dev_info(&pdev->dev, "Fuel gauge not enabled, enabling now\n");
                dev_info(&pdev->dev, "Expect imprecise results\n");
                regmap_update_bits(info->rn5t618->regmap, RN5T618_CONTROL,
                                   FG_ENABLE, FG_ENABLE);
        }

        psy_cfg.drv_data = info;
        info->battery = devm_power_supply_register(&pdev->dev,
                                                   &rn5t618_battery_desc,
                                                   &psy_cfg);
        if (IS_ERR(info->battery)) {
                ret = PTR_ERR(info->battery);
                dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
                return ret;
        }

        info->adp = devm_power_supply_register(&pdev->dev,
                                               &rn5t618_adp_desc,
                                               &psy_cfg);
        if (IS_ERR(info->adp)) {
                ret = PTR_ERR(info->adp);
                dev_err(&pdev->dev, "failed to register adp: %d\n", ret);
                return ret;
        }

        info->usb = devm_power_supply_register(&pdev->dev,
                                               &rn5t618_usb_desc,
                                               &psy_cfg);
        if (IS_ERR(info->usb)) {
                ret = PTR_ERR(info->usb);
                dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
                return ret;
        }

        if (info->rn5t618->irq_data)
                info->irq = regmap_irq_get_virq(info->rn5t618->irq_data,
                                                RN5T618_IRQ_CHG);

        if (info->irq < 0)
                info->irq = -1;
        else {
                ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
                                                rn5t618_charger_irq,
                                                IRQF_ONESHOT,
                                                "rn5t618_power",
                                                &pdev->dev);

                if (ret < 0) {
                        dev_err(&pdev->dev, "request IRQ:%d fail\n",
                                info->irq);
                        info->irq = -1;
                }
        }

        return 0;
}

static struct platform_driver rn5t618_power_driver = {
        .driver = {
                .name   = "rn5t618-power",
        },
        .probe = rn5t618_power_probe,
};

module_platform_driver(rn5t618_power_driver);
MODULE_ALIAS("platform:rn5t618-power");
MODULE_DESCRIPTION("Power supply driver for RICOH RN5T618");
MODULE_LICENSE("GPL");