// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Rockchip RK805 PMIC Power Key driver
 *
 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author: Joseph Chen <chenjh@rock-chips.com>
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>

static irqreturn_t pwrkey_fall_irq(int irq, void *_pwr)
{
        struct input_dev *pwr = _pwr;

        input_report_key(pwr, KEY_POWER, 1);
        input_sync(pwr);

        return IRQ_HANDLED;
}

static irqreturn_t pwrkey_rise_irq(int irq, void *_pwr)
{
        struct input_dev *pwr = _pwr;

        input_report_key(pwr, KEY_POWER, 0);
        input_sync(pwr);

        return IRQ_HANDLED;
}

static int rk805_pwrkey_probe(struct platform_device *pdev)
{
        struct input_dev *pwr;
        int fall_irq, rise_irq;
        int err;

        pwr = devm_input_allocate_device(&pdev->dev);
        if (!pwr) {
                dev_err(&pdev->dev, "Can't allocate power button\n");
                return -ENOMEM;
        }

        pwr->name = "rk805 pwrkey";
        pwr->phys = "rk805_pwrkey/input0";
        pwr->id.bustype = BUS_HOST;
        input_set_capability(pwr, EV_KEY, KEY_POWER);

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

        rise_irq = platform_get_irq(pdev, 1);
        if (rise_irq < 0)
                return rise_irq;

        err = devm_request_any_context_irq(&pwr->dev, fall_irq,
                                           pwrkey_fall_irq,
                                           IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
                                           "rk805_pwrkey_fall", pwr);
        if (err < 0) {
                dev_err(&pdev->dev, "Can't register fall irq: %d\n", err);
                return err;
        }

        err = devm_request_any_context_irq(&pwr->dev, rise_irq,
                                           pwrkey_rise_irq,
                                           IRQF_TRIGGER_RISING | IRQF_ONESHOT,
                                           "rk805_pwrkey_rise", pwr);
        if (err < 0) {
                dev_err(&pdev->dev, "Can't register rise irq: %d\n", err);
                return err;
        }

        err = input_register_device(pwr);
        if (err) {
                dev_err(&pdev->dev, "Can't register power button: %d\n", err);
                return err;
        }

        platform_set_drvdata(pdev, pwr);
        device_init_wakeup(&pdev->dev, true);

        return 0;
}

static struct platform_driver rk805_pwrkey_driver = {
        .probe  = rk805_pwrkey_probe,
        .driver = {
                .name = "rk805-pwrkey",
        },
};
module_platform_driver(rk805_pwrkey_driver);

MODULE_ALIAS("platform:rk805-pwrkey");
MODULE_AUTHOR("Joseph Chen <chenjh@rock-chips.com>");
MODULE_DESCRIPTION("RK805 PMIC Power Key driver");
MODULE_LICENSE("GPL");