// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Input Power Event -> APM Bridge
 *
 *  Copyright (c) 2007 Richard Purdie
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/apm-emulation.h>

static void system_power_event(unsigned int keycode)
{
        switch (keycode) {
        case KEY_SUSPEND:
                apm_queue_event(APM_USER_SUSPEND);
                pr_info("Requesting system suspend...\n");
                break;
        default:
                break;
        }
}

static void apmpower_event(struct input_handle *handle, unsigned int type,
                           unsigned int code, int value)
{
        /* only react on key down events */
        if (value != 1)
                return;

        switch (type) {
        case EV_PWR:
                system_power_event(code);
                break;

        default:
                break;
        }
}

static int apmpower_connect(struct input_handler *handler,
                                          struct input_dev *dev,
                                          const struct input_device_id *id)
{
        struct input_handle *handle;
        int error;

        handle = kzalloc_obj(struct input_handle);
        if (!handle)
                return -ENOMEM;

        handle->dev = dev;
        handle->handler = handler;
        handle->name = "apm-power";

        error = input_register_handle(handle);
        if (error) {
                pr_err("Failed to register input power handler, error %d\n",
                       error);
                kfree(handle);
                return error;
        }

        error = input_open_device(handle);
        if (error) {
                pr_err("Failed to open input power device, error %d\n", error);
                input_unregister_handle(handle);
                kfree(handle);
                return error;
        }

        return 0;
}

static void apmpower_disconnect(struct input_handle *handle)
{
        input_close_device(handle);
        input_unregister_handle(handle);
        kfree(handle);
}

static const struct input_device_id apmpower_ids[] = {
        {
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
                .evbit = { BIT_MASK(EV_PWR) },
        },
        { },
};

MODULE_DEVICE_TABLE(input, apmpower_ids);

static struct input_handler apmpower_handler = {
        .event =        apmpower_event,
        .connect =      apmpower_connect,
        .disconnect =   apmpower_disconnect,
        .name =         "apm-power",
        .id_table =     apmpower_ids,
};

static int __init apmpower_init(void)
{
        return input_register_handler(&apmpower_handler);
}

static void __exit apmpower_exit(void)
{
        input_unregister_handler(&apmpower_handler);
}

module_init(apmpower_init);
module_exit(apmpower_exit);

MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
MODULE_LICENSE("GPL");