text: // 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/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/fb.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 quirk_asus_x101ch = {
  	/* We need this when ACPI function doesn't do this well */
  	.wmi_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,
  	},
  	{
  		.callback = dmi_matched,
  		.ident = "ASUSTeK Computer INC. X101CH",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
  			DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
  		},
  		.driver_data = &quirk_asus_x101ch,
  	},
  	{
  		.callback = dmi_matched,
  		.ident = "ASUSTeK Computer INC. 1015CX",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
  			DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
  		},
  		.driver_data = &quirk_asus_x101ch,
  	},
  	{},
  };
  
  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 = FB_BLANK_UNBLANK;
  }
  
  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);
  