// SPDX-License-Identifier: GPL-2.0+
//
// Power Button driver for RAVE SP
//
// Copyright (C) 2017 Zodiac Inflight Innovations
//
//

#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/rave-sp.h>
#include <linux/platform_device.h>

#define RAVE_SP_EVNT_BUTTON_PRESS       (RAVE_SP_EVNT_BASE + 0x00)

struct rave_sp_power_button {
        struct input_dev *idev;
        struct notifier_block nb;
};

static int rave_sp_power_button_event(struct notifier_block *nb,
                                      unsigned long action, void *data)
{
        struct rave_sp_power_button *pb =
                container_of(nb, struct rave_sp_power_button, nb);
        const u8 event = rave_sp_action_unpack_event(action);
        const u8 value = rave_sp_action_unpack_value(action);
        struct input_dev *idev = pb->idev;

        if (event == RAVE_SP_EVNT_BUTTON_PRESS) {
                input_report_key(idev, KEY_POWER, value);
                input_sync(idev);

                return NOTIFY_STOP;
        }

        return NOTIFY_DONE;
}

static int rave_sp_pwrbutton_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct rave_sp_power_button *pb;
        struct input_dev *idev;
        int error;

        pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
        if (!pb)
                return -ENOMEM;

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

        idev->name = pdev->name;

        input_set_capability(idev, EV_KEY, KEY_POWER);

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

        pb->idev = idev;
        pb->nb.notifier_call = rave_sp_power_button_event;
        pb->nb.priority = 128;

        error = devm_rave_sp_register_event_notifier(dev, &pb->nb);
        if (error)
                return error;

        return 0;
}

static const struct of_device_id rave_sp_pwrbutton_of_match[] = {
        { .compatible = "zii,rave-sp-pwrbutton" },
        {}
};

static struct platform_driver rave_sp_pwrbutton_driver = {
        .probe = rave_sp_pwrbutton_probe,
        .driver = {
                .name = KBUILD_MODNAME,
                .of_match_table = rave_sp_pwrbutton_of_match,
        },
};
module_platform_driver(rave_sp_pwrbutton_driver);

MODULE_DEVICE_TABLE(of, rave_sp_pwrbutton_of_match);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
MODULE_DESCRIPTION("RAVE SP Power Button driver");