/*
 * Retu power button driver.
 *
 * Copyright (C) 2004-2010 Nokia Corporation
 *
 * Original code written by Ari Saastamoinen, Juha Yrjölä and Felipe Balbi.
 * Rewritten by Aaro Koskinen.
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * 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.
 */

#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/retu.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#define RETU_STATUS_PWRONX (1 << 5)

static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr)
{
        struct input_dev *idev = _pwr;
        struct retu_dev *rdev = input_get_drvdata(idev);
        bool state;

        state = !(retu_read(rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX);
        input_report_key(idev, KEY_POWER, state);
        input_sync(idev);

        return IRQ_HANDLED;
}

static int retu_pwrbutton_probe(struct platform_device *pdev)
{
        struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
        struct input_dev *idev;
        int irq;
        int error;

        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return irq;

        idev = devm_input_allocate_device(&pdev->dev);
        if (!idev)
                return -ENOMEM;

        idev->name = "retu-pwrbutton";
        idev->dev.parent = &pdev->dev;

        input_set_capability(idev, EV_KEY, KEY_POWER);
        input_set_drvdata(idev, rdev);

        error = devm_request_threaded_irq(&pdev->dev, irq,
                                          NULL, retu_pwrbutton_irq,
                                          IRQF_ONESHOT,
                                          "retu-pwrbutton", idev);
        if (error)
                return error;

        error = input_register_device(idev);
        if (error)
                return error;

        return 0;
}

static struct platform_driver retu_pwrbutton_driver = {
        .probe          = retu_pwrbutton_probe,
        .driver         = {
                .name   = "retu-pwrbutton",
        },
};
module_platform_driver(retu_pwrbutton_driver);

MODULE_ALIAS("platform:retu-pwrbutton");
MODULE_DESCRIPTION("Retu Power Button");
MODULE_AUTHOR("Ari Saastamoinen");
MODULE_AUTHOR("Felipe Balbi");
MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
MODULE_LICENSE("GPL");