// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Eee PC WMI hotkey driver
 *
 * Copyright(C) 2010 Intel Corporation.
 * Copyright(C) 2010-2011 Corentin Chary <corentin.chary@gmail.com>
 *
 * Portions based on wistron_btns.c:
 * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
 * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
 * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

#include "asus-wmi.h"

#define EEEPC_WMI_FILE  "eeepc-wmi"

MODULE_AUTHOR("Corentin Chary <corentin.chary@gmail.com>");
MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
MODULE_LICENSE("GPL");

#define EEEPC_ACPI_HID          "ASUS010" /* old _HID used in eeepc-laptop */

#define EEEPC_WMI_EVENT_GUID    "ABBC0F72-8EA1-11D1-00A0-C90629100000"

MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);

static bool hotplug_wireless;

module_param(hotplug_wireless, bool, 0444);
MODULE_PARM_DESC(hotplug_wireless,
                 "Enable hotplug for wireless device. "
                 "If your laptop needs that, please report to "
                 "acpi4asus-user@lists.sourceforge.net.");

/* Values for T101MT "Home" key */
#define HOME_PRESS      0xe4
#define HOME_HOLD       0xea
#define HOME_RELEASE    0xe5

static const struct key_entry eeepc_wmi_keymap[] = {
        { KE_KEY, ASUS_WMI_BRN_DOWN, { KEY_BRIGHTNESSDOWN } },
        { KE_KEY, ASUS_WMI_BRN_UP, { KEY_BRIGHTNESSUP } },
        /* Sleep already handled via generic ACPI code */
        { KE_KEY, 0x30, { KEY_VOLUMEUP } },
        { KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
        { KE_KEY, 0x32, { KEY_MUTE } },
        { KE_KEY, 0x5c, { KEY_F15 } }, /* Power Gear key */
        { KE_KEY, 0x5d, { KEY_WLAN } },
        { KE_KEY, 0x6b, { KEY_TOUCHPAD_TOGGLE } }, /* Toggle Touchpad */
        { KE_KEY, 0x82, { KEY_CAMERA } },
        { KE_KEY, 0x83, { KEY_CAMERA_ZOOMIN } },
        { KE_KEY, 0x88, { KEY_WLAN } },
        { KE_KEY, 0xbd, { KEY_CAMERA } },
        { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
        { KE_KEY, 0xe0, { KEY_PROG1 } }, /* Task Manager */
        { KE_KEY, 0xe1, { KEY_F14 } }, /* Change Resolution */
        { KE_KEY, HOME_PRESS, { KEY_CONFIG } }, /* Home/Express gate key */
        { KE_KEY, 0xe8, { KEY_SCREENLOCK } },
        { KE_KEY, 0xe9, { KEY_DISPLAYTOGGLE } },
        { KE_KEY, 0xeb, { KEY_CAMERA_ZOOMOUT } },
        { KE_KEY, 0xec, { KEY_CAMERA_UP } },
        { KE_KEY, 0xed, { KEY_CAMERA_DOWN } },
        { KE_KEY, 0xee, { KEY_CAMERA_LEFT } },
        { KE_KEY, 0xef, { KEY_CAMERA_RIGHT } },
        { KE_KEY, 0xf3, { KEY_MENU } },
        { KE_KEY, 0xf5, { KEY_HOMEPAGE } },
        { KE_KEY, 0xf6, { KEY_ESC } },
        { KE_END, 0},
};

static struct quirk_entry quirk_asus_unknown = {
};

static struct quirk_entry quirk_asus_1000h = {
        .hotplug_wireless = true,
};

static struct quirk_entry quirk_asus_et2012_type1 = {
        .store_backlight_power = true,
};

static struct quirk_entry quirk_asus_et2012_type3 = {
        .scalar_panel_brightness = true,
        .store_backlight_power = true,
};

static struct quirk_entry *quirks;

static void et2012_quirks(void)
{
        const struct dmi_device *dev = NULL;
        char oemstring[30];

        while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL, dev))) {
                if (sscanf(dev->name, "AEMS%24c", oemstring) == 1) {
                        if (oemstring[18] == '1')
                                quirks = &quirk_asus_et2012_type1;
                        else if (oemstring[18] == '3')
                                quirks = &quirk_asus_et2012_type3;
                        break;
                }
        }
}

static int dmi_matched(const struct dmi_system_id *dmi)
{
        char *model;

        quirks = dmi->driver_data;

        model = (char *)dmi->matches[1].substr;
        if (unlikely(strncmp(model, "ET2012", 6) == 0))
                et2012_quirks();

        return 1;
}

static const struct dmi_system_id asus_quirks[] = {
        {
                .callback = dmi_matched,
                .ident = "ASUSTeK Computer INC. 1000H",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "1000H"),
                },
                .driver_data = &quirk_asus_1000h,
        },
        {
                .callback = dmi_matched,
                .ident = "ASUSTeK Computer INC. ET2012E/I",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "ET2012"),
                },
                .driver_data = &quirk_asus_unknown,
        },
        {}
};

static void eeepc_wmi_key_filter(struct asus_wmi_driver *asus_wmi, int *code,
                                 unsigned int *value, bool *autorelease)
{
        switch (*code) {
        case HOME_PRESS:
                *value = 1;
                *autorelease = 0;
                break;
        case HOME_HOLD:
                *code = ASUS_WMI_KEY_IGNORE;
                break;
        case HOME_RELEASE:
                *code = HOME_PRESS;
                *value = 0;
                *autorelease = 0;
                break;
        }
}

static int eeepc_wmi_probe(struct platform_device *pdev)
{
        if (acpi_dev_found(EEEPC_ACPI_HID)) {
                pr_warn("Found legacy ATKD device (%s)\n", EEEPC_ACPI_HID);
                pr_warn("WMI device present, but legacy ATKD device is also "
                        "present and enabled\n");
                pr_warn("You probably booted with acpi_osi=\"Linux\" or "
                        "acpi_osi=\"!Windows 2009\"\n");
                pr_warn("Can't load eeepc-wmi, use default acpi_osi "
                        "(preferred) or eeepc-laptop\n");
                return -EBUSY;
        }
        return 0;
}

static void eeepc_wmi_quirks(struct asus_wmi_driver *driver)
{
        quirks = &quirk_asus_unknown;
        quirks->hotplug_wireless = hotplug_wireless;

        dmi_check_system(asus_quirks);

        driver->quirks = quirks;
        driver->quirks->wapf = -1;
        driver->panel_power = BACKLIGHT_POWER_ON;
}

static struct asus_wmi_driver asus_wmi_driver = {
        .name = EEEPC_WMI_FILE,
        .owner = THIS_MODULE,
        .event_guid = EEEPC_WMI_EVENT_GUID,
        .keymap = eeepc_wmi_keymap,
        .input_name = "Eee PC WMI hotkeys",
        .input_phys = EEEPC_WMI_FILE "/input0",
        .key_filter = eeepc_wmi_key_filter,
        .probe = eeepc_wmi_probe,
        .detect_quirks = eeepc_wmi_quirks,
};


static int __init eeepc_wmi_init(void)
{
        return asus_wmi_register_driver(&asus_wmi_driver);
}

static void __exit eeepc_wmi_exit(void)
{
        asus_wmi_unregister_driver(&asus_wmi_driver);
}

module_init(eeepc_wmi_init);
module_exit(eeepc_wmi_exit);