// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * toshiba_wmi.c - Toshiba WMI Hotkey Driver
 *
 * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/dmi.h>

MODULE_AUTHOR("Azael Avalos");
MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
MODULE_LICENSE("GPL");

#define WMI_EVENT_GUID  "59142400-C6A3-40FA-BADB-8A2652834100"

MODULE_ALIAS("wmi:"WMI_EVENT_GUID);

static struct input_dev *toshiba_wmi_input_dev;

static const struct key_entry toshiba_wmi_keymap[] __initconst = {
        /* TODO: Add keymap values once found... */
        /*{ KE_KEY, 0x00, { KEY_ } },*/
        { KE_END, 0 }
};

static void toshiba_wmi_notify(union acpi_object *obj, void *context)
{
        if (!obj)
                return;

        /* TODO: Add proper checks once we have data */
        pr_debug("Unknown event received, obj type %x\n", obj->type);
}

static const struct dmi_system_id toshiba_wmi_dmi_table[] __initconst = {
        {
                .ident = "Toshiba laptop",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
                },
        },
        {}
};

static int __init toshiba_wmi_input_setup(void)
{
        acpi_status status;
        int err;

        toshiba_wmi_input_dev = input_allocate_device();
        if (!toshiba_wmi_input_dev)
                return -ENOMEM;

        toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
        toshiba_wmi_input_dev->phys = "wmi/input0";
        toshiba_wmi_input_dev->id.bustype = BUS_HOST;

        err = sparse_keymap_setup(toshiba_wmi_input_dev,
                                  toshiba_wmi_keymap, NULL);
        if (err)
                goto err_free_dev;

        status = wmi_install_notify_handler(WMI_EVENT_GUID,
                                            toshiba_wmi_notify, NULL);
        if (ACPI_FAILURE(status)) {
                err = -EIO;
                goto err_free_dev;
        }

        err = input_register_device(toshiba_wmi_input_dev);
        if (err)
                goto err_remove_notifier;

        return 0;

 err_remove_notifier:
        wmi_remove_notify_handler(WMI_EVENT_GUID);
 err_free_dev:
        input_free_device(toshiba_wmi_input_dev);
        return err;
}

static void toshiba_wmi_input_destroy(void)
{
        wmi_remove_notify_handler(WMI_EVENT_GUID);
        input_unregister_device(toshiba_wmi_input_dev);
}

static int __init toshiba_wmi_init(void)
{
        int ret;

        if (!wmi_has_guid(WMI_EVENT_GUID) ||
            !dmi_check_system(toshiba_wmi_dmi_table))
                return -ENODEV;

        ret = toshiba_wmi_input_setup();
        if (ret) {
                pr_err("Failed to setup input device\n");
                return ret;
        }

        pr_info("Toshiba WMI Hotkey Driver\n");

        return 0;
}

static void __exit toshiba_wmi_exit(void)
{
        if (wmi_has_guid(WMI_EVENT_GUID))
                toshiba_wmi_input_destroy();
}

module_init(toshiba_wmi_init);
module_exit(toshiba_wmi_exit);