drivers/input/misc/wistron_btns.c - kernel/msm-4.19 - Gitiles

 /*
  * Wistron laptop button driver
  * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
  * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
  * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
  *
  * You can redistribute and/or modify this program under the terms of the
  * GNU General Public License version 2 as published by the Free Software
  * Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  * Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 59 Temple Place Suite 330, Boston, MA 02111-1307, USA.
  */
 #include <linux/io.h>
 #include <linux/dmi.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/mc146818rtc.h>
 #include <linux/module.h>
 #include <linux/preempt.h>
 #include <linux/string.h>
 #include <linux/timer.h>
 #include <linux/types.h>
 #include <linux/platform_device.h>

 /*
  * Number of attempts to read data from queue per poll;
  * the queue can hold up to 31 entries
  */
 #define MAX_POLL_ITERATIONS 64

 #define POLL_FREQUENCY 10 /* Number of polls per second */

 #if POLL_FREQUENCY > HZ
 #error "POLL_FREQUENCY too high"
 #endif

 /* BIOS subsystem IDs */
 #define WIFI		0x35
 #define BLUETOOTH	0x34

 MODULE_AUTHOR("Miloslav Trmac <mitr@volny.cz>");
 MODULE_DESCRIPTION("Wistron laptop button driver");
 MODULE_LICENSE("GPL v2");
 MODULE_VERSION("0.1");

 static int force; /* = 0; */
 module_param(force, bool, 0);
 MODULE_PARM_DESC(force, "Load even if computer is not in database");

 static char *keymap_name; /* = NULL; */
 module_param_named(keymap, keymap_name, charp, 0);
 MODULE_PARM_DESC(keymap, "Keymap name, if it can't be autodetected");

 static struct platform_device *wistron_device;

  /* BIOS interface implementation */

 static void __iomem *bios_entry_point; /* BIOS routine entry point */
 static void __iomem *bios_code_map_base;
 static void __iomem *bios_data_map_base;

 static u8 cmos_address;

 struct regs {
 	u32 eax, ebx, ecx;
 };

 static void call_bios(struct regs *regs)
 {
 	unsigned long flags;

 	preempt_disable();
 	local_irq_save(flags);
 	asm volatile ("pushl %%ebp;"
 		      "movl %7, %%ebp;"
 		      "call *%6;"
 		      "popl %%ebp"
 		      : "=a" (regs->eax), "=b" (regs->ebx), "=c" (regs->ecx)
 		      : "0" (regs->eax), "1" (regs->ebx), "2" (regs->ecx),
 			"m" (bios_entry_point), "m" (bios_data_map_base)
 		      : "edx", "edi", "esi", "memory");
 	local_irq_restore(flags);
 	preempt_enable();
 }

 static ssize_t __init locate_wistron_bios(void __iomem *base)
 {
 	static unsigned char __initdata signature[] =
 		{ 0x42, 0x21, 0x55, 0x30 };
 	ssize_t offset;

 	for (offset = 0; offset < 0x10000; offset += 0x10) {
 		if (check_signature(base + offset, signature,
 				    sizeof(signature)) != 0)
 			return offset;
 	}
 	return -1;
 }

 static int __init map_bios(void)
 {
 	void __iomem *base;
 	ssize_t offset;
 	u32 entry_point;

 	base = ioremap(0xF0000, 0x10000); /* Can't fail */
 	offset = locate_wistron_bios(base);
 	if (offset < 0) {
 		printk(KERN_ERR "wistron_btns: BIOS entry point not found\n");
 		iounmap(base);
 		return -ENODEV;
 	}

 	entry_point = readl(base + offset + 5);
 	printk(KERN_DEBUG
 		"wistron_btns: BIOS signature found at %p, entry point %08X\n",
 		base + offset, entry_point);

 	if (entry_point >= 0xF0000) {
 		bios_code_map_base = base;
 		bios_entry_point = bios_code_map_base + (entry_point & 0xFFFF);
 	} else {
 		iounmap(base);
 		bios_code_map_base = ioremap(entry_point & ~0x3FFF, 0x4000);
 		if (bios_code_map_base == NULL) {
 			printk(KERN_ERR
 				"wistron_btns: Can't map BIOS code at %08X\n",
 				entry_point & ~0x3FFF);
 			goto err;
 		}
 		bios_entry_point = bios_code_map_base + (entry_point & 0x3FFF);
 	}
 	/* The Windows driver maps 0x10000 bytes, we keep only one page... */
 	bios_data_map_base = ioremap(0x400, 0xc00);
 	if (bios_data_map_base == NULL) {
 		printk(KERN_ERR "wistron_btns: Can't map BIOS data\n");
 		goto err_code;
 	}
 	return 0;

 err_code:
 	iounmap(bios_code_map_base);
 err:
 	return -ENOMEM;
 }

 static inline void unmap_bios(void)
 {
 	iounmap(bios_code_map_base);
 	iounmap(bios_data_map_base);
 }

  /* BIOS calls */

 static u16 bios_pop_queue(void)
 {
 	struct regs regs;

 	memset(&regs, 0, sizeof (regs));
 	regs.eax = 0x9610;
 	regs.ebx = 0x061C;
 	regs.ecx = 0x0000;
 	call_bios(&regs);

 	return regs.eax;
 }

 static void __devinit bios_attach(void)
 {
 	struct regs regs;

 	memset(&regs, 0, sizeof (regs));
 	regs.eax = 0x9610;
 	regs.ebx = 0x012E;
 	call_bios(&regs);
 }

 static void bios_detach(void)
 {
 	struct regs regs;

 	memset(&regs, 0, sizeof (regs));
 	regs.eax = 0x9610;
 	regs.ebx = 0x002E;
 	call_bios(&regs);
 }

 static u8 __devinit bios_get_cmos_address(void)
 {
 	struct regs regs;

 	memset(&regs, 0, sizeof (regs));
 	regs.eax = 0x9610;
 	regs.ebx = 0x051C;
 	call_bios(&regs);

 	return regs.ecx;
 }

 static u16 __devinit bios_get_default_setting(u8 subsys)
 {
 	struct regs regs;

 	memset(&regs, 0, sizeof (regs));
 	regs.eax = 0x9610;
 	regs.ebx = 0x0200 | subsys;
 	call_bios(&regs);

 	return regs.eax;
 }

 static void bios_set_state(u8 subsys, int enable)
 {
 	struct regs regs;

 	memset(&regs, 0, sizeof (regs));
 	regs.eax = 0x9610;
 	regs.ebx = (enable ? 0x0100 : 0x0000) | subsys;
 	call_bios(&regs);
 }

 /* Hardware database */

 struct key_entry {
 	char type;		/* See KE_* below */
 	u8 code;
 	unsigned keycode;	/* For KE_KEY */
 };

 enum { KE_END, KE_KEY, KE_WIFI, KE_BLUETOOTH };

 static const struct key_entry *keymap; /* = NULL; Current key map */
 static int have_wifi;
 static int have_bluetooth;

 static int __init dmi_matched(struct dmi_system_id *dmi)
 {
 	const struct key_entry *key;

 	keymap = dmi->driver_data;
 	for (key = keymap; key->type != KE_END; key++) {
 		if (key->type == KE_WIFI)
 			have_wifi = 1;
 		else if (key->type == KE_BLUETOOTH)
 			have_bluetooth = 1;
 	}
 	return 1;
 }

 static struct key_entry keymap_empty[] = {
 	{ KE_END, 0 }
 };

 static struct key_entry keymap_fs_amilo_pro_v2000[] = {
 	{ KE_KEY,  0x01, KEY_HELP },
 	{ KE_KEY,  0x11, KEY_PROG1 },
 	{ KE_KEY,  0x12, KEY_PROG2 },
 	{ KE_WIFI, 0x30, 0 },
 	{ KE_KEY,  0x31, KEY_MAIL },
 	{ KE_KEY,  0x36, KEY_WWW },
 	{ KE_END,  0 }
 };

 static struct key_entry keymap_fujitsu_n3510[] = {
 	{ KE_KEY, 0x11, KEY_PROG1 },
 	{ KE_KEY, 0x12, KEY_PROG2 },
 	{ KE_KEY, 0x36, KEY_WWW },
 	{ KE_KEY, 0x31, KEY_MAIL },
 	{ KE_KEY, 0x71, KEY_STOPCD },
 	{ KE_KEY, 0x72, KEY_PLAYPAUSE },
 	{ KE_KEY, 0x74, KEY_REWIND },
 	{ KE_KEY, 0x78, KEY_FORWARD },
 	{ KE_END, 0 }
 };

 static struct key_entry keymap_wistron_ms2111[] = {
 	{ KE_KEY,  0x11, KEY_PROG1 },
 	{ KE_KEY,  0x12, KEY_PROG2 },
 	{ KE_KEY,  0x13, KEY_PROG3 },
 	{ KE_KEY,  0x31, KEY_MAIL },
 	{ KE_KEY,  0x36, KEY_WWW },
 	{ KE_END,  0 }
 };

 static struct key_entry keymap_wistron_ms2141[] = {
 	{ KE_KEY,  0x11, KEY_PROG1 },
 	{ KE_KEY,  0x12, KEY_PROG2 },
 	{ KE_WIFI, 0x30, 0 },
 	{ KE_KEY,  0x22, KEY_REWIND },
 	{ KE_KEY,  0x23, KEY_FORWARD },
 	{ KE_KEY,  0x24, KEY_PLAYPAUSE },
 	{ KE_KEY,  0x25, KEY_STOPCD },
 	{ KE_KEY,  0x31, KEY_MAIL },
 	{ KE_KEY,  0x36, KEY_WWW },
 	{ KE_END,  0 }
 };

 static struct key_entry keymap_acer_aspire_1500[] = {
 	{ KE_KEY, 0x11, KEY_PROG1 },
 	{ KE_KEY, 0x12, KEY_PROG2 },
 	{ KE_WIFI, 0x30, 0 },
 	{ KE_KEY, 0x31, KEY_MAIL },
 	{ KE_KEY, 0x36, KEY_WWW },
 	{ KE_BLUETOOTH, 0x44, 0 },
 	{ KE_END, 0 }
 };

 static struct key_entry keymap_acer_travelmate_240[] = {
 	{ KE_KEY, 0x31, KEY_MAIL },
 	{ KE_KEY, 0x36, KEY_WWW },
 	{ KE_KEY, 0x11, KEY_PROG1 },
 	{ KE_KEY, 0x12, KEY_PROG2 },
 	{ KE_BLUETOOTH, 0x44, 0 },
 	{ KE_WIFI, 0x30, 0 },
 	{ KE_END, 0 }
 };

 static struct key_entry keymap_aopen_1559as[] = {
 	{ KE_KEY,  0x01, KEY_HELP },
 	{ KE_KEY,  0x06, KEY_PROG3 },
 	{ KE_KEY,  0x11, KEY_PROG1 },
 	{ KE_KEY,  0x12, KEY_PROG2 },
 	{ KE_WIFI, 0x30, 0 },
 	{ KE_KEY,  0x31, KEY_MAIL },
 	{ KE_KEY,  0x36, KEY_WWW },
 	{ KE_END,  0 },
 };

 /*
  * If your machine is not here (which is currently rather likely), please send
  * a list of buttons and their key codes (reported when loading this module
  * with force=1) and the output of dmidecode to $MODULE_AUTHOR.
  */
 static struct dmi_system_id dmi_ids[] __initdata = {
 	{
 		.callback = dmi_matched,
 		.ident = "Fujitsu-Siemens Amilo Pro V2000",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Pro V2000"),
 		},
 		.driver_data = keymap_fs_amilo_pro_v2000
 	},
 	{
 		.callback = dmi_matched,
 		.ident = "Fujitsu-Siemens Amilo M7400",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "AMILO M        "),
 		},
 		.driver_data = keymap_fs_amilo_pro_v2000
 	},
 	{
 		.callback = dmi_matched,
 		.ident = "Fujitsu N3510",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "N3510"),
 		},
 		.driver_data = keymap_fujitsu_n3510
 	},
 	{
 		.callback = dmi_matched,
 		.ident = "Acer Aspire 1500",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1500"),
 		},
 		.driver_data = keymap_acer_aspire_1500
 	},
 	{
 		.callback = dmi_matched,
 		.ident = "Acer TravelMate 240",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 240"),
 		},
 		.driver_data = keymap_acer_travelmate_240
 	},
 	{
 		.callback = dmi_matched,
 		.ident = "Acer TravelMate 2424NWXCi",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 2420"),
 		},
 		.driver_data = keymap_acer_travelmate_240
 	},
 	{
 		.callback = dmi_matched,
 		.ident = "AOpen 1559AS",
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "E2U"),
 			DMI_MATCH(DMI_BOARD_NAME, "E2U"),
 		},
 		.driver_data = keymap_aopen_1559as
 	},
 	{
 		.callback = dmi_matched,
 		.ident = "Medion MD 9783",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "MD 9783"),
 		},
 		.driver_data = keymap_wistron_ms2111
 	},
 	{ NULL, }
 };

 static int __init select_keymap(void)
 {
 	if (keymap_name != NULL) {
 		if (strcmp (keymap_name, "1557/MS2141") == 0)
 			keymap = keymap_wistron_ms2141;
 		else {
 			printk(KERN_ERR "wistron_btns: Keymap unknown\n");
 			return -EINVAL;
 		}
 	}
 	dmi_check_system(dmi_ids);
 	if (keymap == NULL) {
 		if (!force) {
 			printk(KERN_ERR "wistron_btns: System unknown\n");
 			return -ENODEV;
 		}
 		keymap = keymap_empty;
 	}
 	return 0;
 }

  /* Input layer interface */

 static struct input_dev *input_dev;

 static int __devinit setup_input_dev(void)
 {
 	const struct key_entry *key;
 	int error;

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

 	input_dev->name = "Wistron laptop buttons";
 	input_dev->phys = "wistron/input0";
 	input_dev->id.bustype = BUS_HOST;
 	input_dev->cdev.dev = &wistron_device->dev;

 	for (key = keymap; key->type != KE_END; key++) {
 		if (key->type == KE_KEY) {
 			input_dev->evbit[LONG(EV_KEY)] = BIT(EV_KEY);
 			set_bit(key->keycode, input_dev->keybit);
 		}
 	}

 	error = input_register_device(input_dev);
 	if (error) {
 		input_free_device(input_dev);
 		return error;
 	}

 	return 0;
 }

 static void report_key(unsigned keycode)
 {
 	input_report_key(input_dev, keycode, 1);
 	input_sync(input_dev);
 	input_report_key(input_dev, keycode, 0);
 	input_sync(input_dev);
 }

  /* Driver core */

 static int wifi_enabled;
 static int bluetooth_enabled;

 static void poll_bios(unsigned long);

 static struct timer_list poll_timer = TIMER_INITIALIZER(poll_bios, 0, 0);

 static void handle_key(u8 code)
 {
 	const struct key_entry *key;

 	for (key = keymap; key->type != KE_END; key++) {
 		if (code == key->code) {
 			switch (key->type) {
 			case KE_KEY:
 				report_key(key->keycode);
 				break;

 			case KE_WIFI:
 				if (have_wifi) {
 					wifi_enabled = !wifi_enabled;
 					bios_set_state(WIFI, wifi_enabled);
 				}
 				break;

 			case KE_BLUETOOTH:
 				if (have_bluetooth) {
 					bluetooth_enabled = !bluetooth_enabled;
 					bios_set_state(BLUETOOTH, bluetooth_enabled);
 				}
 				break;

 			case KE_END:
 			default:
 				BUG();
 			}
 			return;
 		}
 	}
 	printk(KERN_NOTICE "wistron_btns: Unknown key code %02X\n", code);
 }

 static void poll_bios(unsigned long discard)
 {
 	u8 qlen;
 	u16 val;

 	for (;;) {
 		qlen = CMOS_READ(cmos_address);
 		if (qlen == 0)
 			break;
 		val = bios_pop_queue();
 		if (val != 0 && !discard)
 			handle_key((u8)val);
 	}

 	mod_timer(&poll_timer, jiffies + HZ / POLL_FREQUENCY);
 }

 static int __devinit wistron_probe(struct platform_device *dev)
 {
 	int err = setup_input_dev();
 	if (err)
 		return err;

 	bios_attach();
 	cmos_address = bios_get_cmos_address();

 	if (have_wifi) {
 		u16 wifi = bios_get_default_setting(WIFI);
 		if (wifi & 1)
 			wifi_enabled = (wifi & 2) ? 1 : 0;
 		else
 			have_wifi = 0;

 		if (have_wifi)
 			bios_set_state(WIFI, wifi_enabled);
 	}

 	if (have_bluetooth) {
 		u16 bt = bios_get_default_setting(BLUETOOTH);
 		if (bt & 1)
 			bluetooth_enabled = (bt & 2) ? 1 : 0;
 		else
 			have_bluetooth = 0;

 		if (have_bluetooth)
 			bios_set_state(BLUETOOTH, bluetooth_enabled);
 	}

 	poll_bios(1); /* Flush stale event queue and arm timer */

 	return 0;
 }

 static int __devexit wistron_remove(struct platform_device *dev)
 {
 	del_timer_sync(&poll_timer);
 	input_unregister_device(input_dev);
 	bios_detach();

 	return 0;
 }

 #ifdef CONFIG_PM
 static int wistron_suspend(struct platform_device *dev, pm_message_t state)
 {
 	del_timer_sync(&poll_timer);

 	if (have_wifi)
 		bios_set_state(WIFI, 0);

 	if (have_bluetooth)
 		bios_set_state(BLUETOOTH, 0);

 	return 0;
 }

 static int wistron_resume(struct platform_device *dev)
 {
 	if (have_wifi)
 		bios_set_state(WIFI, wifi_enabled);

 	if (have_bluetooth)
 		bios_set_state(BLUETOOTH, bluetooth_enabled);

 	poll_bios(1);

 	return 0;
 }
 #else
 #define wistron_suspend		NULL
 #define wistron_resume		NULL
 #endif

 static struct platform_driver wistron_driver = {
 	.driver		= {
 		.name	= "wistron-bios",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= wistron_probe,
 	.remove		= __devexit_p(wistron_remove),
 	.suspend	= wistron_suspend,
 	.resume		= wistron_resume,
 };

 static int __init wb_module_init(void)
 {
 	int err;

 	err = select_keymap();
 	if (err)
 		return err;

 	err = map_bios();
 	if (err)
 		return err;

 	err = platform_driver_register(&wistron_driver);
 	if (err)
 		goto err_unmap_bios;

 	wistron_device = platform_device_alloc("wistron-bios", -1);
 	if (!wistron_device) {
 		err = -ENOMEM;
 		goto err_unregister_driver;
 	}

 	err = platform_device_add(wistron_device);
 	if (err)
 		goto err_free_device;

 	return 0;

  err_free_device:
 	platform_device_put(wistron_device);
  err_unregister_driver:
 	platform_driver_unregister(&wistron_driver);
  err_unmap_bios:
 	unmap_bios();

 	return err;
 }

 static void __exit wb_module_exit(void)
 {
 	platform_device_unregister(wistron_device);
 	platform_driver_unregister(&wistron_driver);
 	unmap_bios();
 }

 module_init(wb_module_init);
 module_exit(wb_module_exit);
	/*
	* Wistron laptop button driver
	* Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
	* Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
	* Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
	*
	* You can redistribute and/or modify this program under the terms of the
	* GNU General Public License version 2 as published by the Free Software
	* Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
	* Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 59 Temple Place Suite 330, Boston, MA 02111-1307, USA.
	*/
	#include <linux/io.h>
	#include <linux/dmi.h>
	#include <linux/init.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/mc146818rtc.h>
	#include <linux/module.h>
	#include <linux/preempt.h>
	#include <linux/string.h>
	#include <linux/timer.h>
	#include <linux/types.h>
	#include <linux/platform_device.h>

	/*
	* Number of attempts to read data from queue per poll;
	* the queue can hold up to 31 entries
	*/
	#define MAX_POLL_ITERATIONS 64

	#define POLL_FREQUENCY 10 /* Number of polls per second */

	#if POLL_FREQUENCY > HZ
	#error "POLL_FREQUENCY too high"
	#endif

	/* BIOS subsystem IDs */
	#define WIFI 0x35
	#define BLUETOOTH 0x34

	MODULE_AUTHOR("Miloslav Trmac <mitr@volny.cz>");
	MODULE_DESCRIPTION("Wistron laptop button driver");
	MODULE_LICENSE("GPL v2");
	MODULE_VERSION("0.1");

	static int force; /* = 0; */
	module_param(force, bool, 0);
	MODULE_PARM_DESC(force, "Load even if computer is not in database");

	static char keymap_name; / = NULL; */
	module_param_named(keymap, keymap_name, charp, 0);
	MODULE_PARM_DESC(keymap, "Keymap name, if it can't be autodetected");

	static struct platform_device *wistron_device;

	/* BIOS interface implementation */

	static void __iomem bios_entry_point; / BIOS routine entry point */
	static void __iomem *bios_code_map_base;
	static void __iomem *bios_data_map_base;

	static u8 cmos_address;

	struct regs {
	u32 eax, ebx, ecx;
	};

	static void call_bios(struct regs *regs)
	{
	unsigned long flags;

	preempt_disable();
	local_irq_save(flags);
	asm volatile ("pushl %%ebp;"
	"movl %7, %%ebp;"
	"call *%6;"
	"popl %%ebp"
	: "=a" (regs->eax), "=b" (regs->ebx), "=c" (regs->ecx)
	: "0" (regs->eax), "1" (regs->ebx), "2" (regs->ecx),
	"m" (bios_entry_point), "m" (bios_data_map_base)
	: "edx", "edi", "esi", "memory");
	local_irq_restore(flags);
	preempt_enable();
	}

	static ssize_t __init locate_wistron_bios(void __iomem *base)
	{
	static unsigned char __initdata signature[] =
	{ 0x42, 0x21, 0x55, 0x30 };
	ssize_t offset;

	for (offset = 0; offset < 0x10000; offset += 0x10) {
	if (check_signature(base + offset, signature,
	sizeof(signature)) != 0)
	return offset;
	}
	return -1;
	}

	static int __init map_bios(void)
	{
	void __iomem *base;
	ssize_t offset;
	u32 entry_point;

	base = ioremap(0xF0000, 0x10000); /* Can't fail */
	offset = locate_wistron_bios(base);
	if (offset < 0) {
	printk(KERN_ERR "wistron_btns: BIOS entry point not found\n");
	iounmap(base);
	return -ENODEV;
	}

	entry_point = readl(base + offset + 5);
	printk(KERN_DEBUG
	"wistron_btns: BIOS signature found at %p, entry point %08X\n",
	base + offset, entry_point);

	if (entry_point >= 0xF0000) {
	bios_code_map_base = base;
	bios_entry_point = bios_code_map_base + (entry_point & 0xFFFF);
	} else {
	iounmap(base);
	bios_code_map_base = ioremap(entry_point & ~0x3FFF, 0x4000);
	if (bios_code_map_base == NULL) {
	printk(KERN_ERR
	"wistron_btns: Can't map BIOS code at %08X\n",
	entry_point & ~0x3FFF);
	goto err;
	}
	bios_entry_point = bios_code_map_base + (entry_point & 0x3FFF);
	}
	/* The Windows driver maps 0x10000 bytes, we keep only one page... */
	bios_data_map_base = ioremap(0x400, 0xc00);
	if (bios_data_map_base == NULL) {
	printk(KERN_ERR "wistron_btns: Can't map BIOS data\n");
	goto err_code;
	}
	return 0;

	err_code:
	iounmap(bios_code_map_base);
	err:
	return -ENOMEM;
	}

	static inline void unmap_bios(void)
	{
	iounmap(bios_code_map_base);
	iounmap(bios_data_map_base);
	}

	/* BIOS calls */

	static u16 bios_pop_queue(void)
	{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x061C;
	regs.ecx = 0x0000;
	call_bios(&regs);

	return regs.eax;
	}

	static void __devinit bios_attach(void)
	{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x012E;
	call_bios(&regs);
	}

	static void bios_detach(void)
	{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x002E;
	call_bios(&regs);
	}

	static u8 __devinit bios_get_cmos_address(void)
	{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x051C;
	call_bios(&regs);

	return regs.ecx;
	}

	static u16 __devinit bios_get_default_setting(u8 subsys)
	{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x0200 \| subsys;
	call_bios(&regs);

	return regs.eax;
	}

	static void bios_set_state(u8 subsys, int enable)
	{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = (enable ? 0x0100 : 0x0000) \| subsys;
	call_bios(&regs);
	}

	/* Hardware database */

	struct key_entry {
	char type; /* See KE_* below */
	u8 code;
	unsigned keycode; /* For KE_KEY */
	};

	enum { KE_END, KE_KEY, KE_WIFI, KE_BLUETOOTH };

	static const struct key_entry keymap; / = NULL; Current key map */
	static int have_wifi;
	static int have_bluetooth;

	static int __init dmi_matched(struct dmi_system_id *dmi)
	{
	const struct key_entry *key;

	keymap = dmi->driver_data;
	for (key = keymap; key->type != KE_END; key++) {
	if (key->type == KE_WIFI)
	have_wifi = 1;
	else if (key->type == KE_BLUETOOTH)
	have_bluetooth = 1;
	}
	return 1;
	}

	static struct key_entry keymap_empty[] = {
	{ KE_END, 0 }
	};

	static struct key_entry keymap_fs_amilo_pro_v2000[] = {
	{ KE_KEY, 0x01, KEY_HELP },
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_END, 0 }
	};

	static struct key_entry keymap_fujitsu_n3510[] = {
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x71, KEY_STOPCD },
	{ KE_KEY, 0x72, KEY_PLAYPAUSE },
	{ KE_KEY, 0x74, KEY_REWIND },
	{ KE_KEY, 0x78, KEY_FORWARD },
	{ KE_END, 0 }
	};

	static struct key_entry keymap_wistron_ms2111[] = {
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_KEY, 0x13, KEY_PROG3 },
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_END, 0 }
	};

	static struct key_entry keymap_wistron_ms2141[] = {
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_KEY, 0x22, KEY_REWIND },
	{ KE_KEY, 0x23, KEY_FORWARD },
	{ KE_KEY, 0x24, KEY_PLAYPAUSE },
	{ KE_KEY, 0x25, KEY_STOPCD },
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_END, 0 }
	};

	static struct key_entry keymap_acer_aspire_1500[] = {
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_BLUETOOTH, 0x44, 0 },
	{ KE_END, 0 }
	};

	static struct key_entry keymap_acer_travelmate_240[] = {
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_BLUETOOTH, 0x44, 0 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_END, 0 }
	};

	static struct key_entry keymap_aopen_1559as[] = {
	{ KE_KEY, 0x01, KEY_HELP },
	{ KE_KEY, 0x06, KEY_PROG3 },
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_END, 0 },
	};

	/*
	* If your machine is not here (which is currently rather likely), please send
	* a list of buttons and their key codes (reported when loading this module
	* with force=1) and the output of dmidecode to $MODULE_AUTHOR.
	*/
	static struct dmi_system_id dmi_ids[] __initdata = {
	{
	.callback = dmi_matched,
	.ident = "Fujitsu-Siemens Amilo Pro V2000",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
	DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Pro V2000"),
	},
	.driver_data = keymap_fs_amilo_pro_v2000
	},
	{
	.callback = dmi_matched,
	.ident = "Fujitsu-Siemens Amilo M7400",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
	DMI_MATCH(DMI_PRODUCT_NAME, "AMILO M "),
	},
	.driver_data = keymap_fs_amilo_pro_v2000
	},
	{
	.callback = dmi_matched,
	.ident = "Fujitsu N3510",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
	DMI_MATCH(DMI_PRODUCT_NAME, "N3510"),
	},
	.driver_data = keymap_fujitsu_n3510
	},
	{
	.callback = dmi_matched,
	.ident = "Acer Aspire 1500",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1500"),
	},
	.driver_data = keymap_acer_aspire_1500
	},
	{
	.callback = dmi_matched,
	.ident = "Acer TravelMate 240",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 240"),
	},
	.driver_data = keymap_acer_travelmate_240
	},
	{
	.callback = dmi_matched,
	.ident = "Acer TravelMate 2424NWXCi",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 2420"),
	},
	.driver_data = keymap_acer_travelmate_240
	},
	{
	.callback = dmi_matched,
	.ident = "AOpen 1559AS",
	.matches = {
	DMI_MATCH(DMI_PRODUCT_NAME, "E2U"),
	DMI_MATCH(DMI_BOARD_NAME, "E2U"),
	},
	.driver_data = keymap_aopen_1559as
	},
	{
	.callback = dmi_matched,
	.ident = "Medion MD 9783",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
	DMI_MATCH(DMI_PRODUCT_NAME, "MD 9783"),
	},
	.driver_data = keymap_wistron_ms2111
	},
	{ NULL, }
	};

	static int __init select_keymap(void)
	{
	if (keymap_name != NULL) {
	if (strcmp (keymap_name, "1557/MS2141") == 0)
	keymap = keymap_wistron_ms2141;
	else {
	printk(KERN_ERR "wistron_btns: Keymap unknown\n");
	return -EINVAL;
	}
	}
	dmi_check_system(dmi_ids);
	if (keymap == NULL) {
	if (!force) {
	printk(KERN_ERR "wistron_btns: System unknown\n");
	return -ENODEV;
	}
	keymap = keymap_empty;
	}
	return 0;
	}

	/* Input layer interface */

	static struct input_dev *input_dev;

	static int __devinit setup_input_dev(void)
	{
	const struct key_entry *key;
	int error;

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

	input_dev->name = "Wistron laptop buttons";
	input_dev->phys = "wistron/input0";
	input_dev->id.bustype = BUS_HOST;
	input_dev->cdev.dev = &wistron_device->dev;

	for (key = keymap; key->type != KE_END; key++) {
	if (key->type == KE_KEY) {
	input_dev->evbit[LONG(EV_KEY)] = BIT(EV_KEY);
	set_bit(key->keycode, input_dev->keybit);
	}
	}

	error = input_register_device(input_dev);
	if (error) {
	input_free_device(input_dev);
	return error;
	}

	return 0;
	}

	static void report_key(unsigned keycode)
	{
	input_report_key(input_dev, keycode, 1);
	input_sync(input_dev);
	input_report_key(input_dev, keycode, 0);
	input_sync(input_dev);
	}

	/* Driver core */

	static int wifi_enabled;
	static int bluetooth_enabled;

	static void poll_bios(unsigned long);

	static struct timer_list poll_timer = TIMER_INITIALIZER(poll_bios, 0, 0);

	static void handle_key(u8 code)
	{
	const struct key_entry *key;

	for (key = keymap; key->type != KE_END; key++) {
	if (code == key->code) {
	switch (key->type) {
	case KE_KEY:
	report_key(key->keycode);
	break;

	case KE_WIFI:
	if (have_wifi) {
	wifi_enabled = !wifi_enabled;
	bios_set_state(WIFI, wifi_enabled);
	}
	break;

	case KE_BLUETOOTH:
	if (have_bluetooth) {
	bluetooth_enabled = !bluetooth_enabled;
	bios_set_state(BLUETOOTH, bluetooth_enabled);
	}
	break;

	case KE_END:
	default:
	BUG();
	}
	return;
	}
	}
	printk(KERN_NOTICE "wistron_btns: Unknown key code %02X\n", code);
	}

	static void poll_bios(unsigned long discard)
	{
	u8 qlen;
	u16 val;

	for (;;) {
	qlen = CMOS_READ(cmos_address);
	if (qlen == 0)
	break;
	val = bios_pop_queue();
	if (val != 0 && !discard)
	handle_key((u8)val);
	}

	mod_timer(&poll_timer, jiffies + HZ / POLL_FREQUENCY);
	}

	static int __devinit wistron_probe(struct platform_device *dev)
	{
	int err = setup_input_dev();
	if (err)
	return err;

	bios_attach();
	cmos_address = bios_get_cmos_address();

	if (have_wifi) {
	u16 wifi = bios_get_default_setting(WIFI);
	if (wifi & 1)
	wifi_enabled = (wifi & 2) ? 1 : 0;
	else
	have_wifi = 0;

	if (have_wifi)
	bios_set_state(WIFI, wifi_enabled);
	}

	if (have_bluetooth) {
	u16 bt = bios_get_default_setting(BLUETOOTH);
	if (bt & 1)
	bluetooth_enabled = (bt & 2) ? 1 : 0;
	else
	have_bluetooth = 0;

	if (have_bluetooth)
	bios_set_state(BLUETOOTH, bluetooth_enabled);
	}

	poll_bios(1); /* Flush stale event queue and arm timer */

	return 0;
	}

	static int __devexit wistron_remove(struct platform_device *dev)
	{
	del_timer_sync(&poll_timer);
	input_unregister_device(input_dev);
	bios_detach();

	return 0;
	}

	#ifdef CONFIG_PM
	static int wistron_suspend(struct platform_device *dev, pm_message_t state)
	{
	del_timer_sync(&poll_timer);

	if (have_wifi)
	bios_set_state(WIFI, 0);

	if (have_bluetooth)
	bios_set_state(BLUETOOTH, 0);

	return 0;
	}

	static int wistron_resume(struct platform_device *dev)
	{
	if (have_wifi)
	bios_set_state(WIFI, wifi_enabled);

	if (have_bluetooth)
	bios_set_state(BLUETOOTH, bluetooth_enabled);

	poll_bios(1);

	return 0;
	}
	#else
	#define wistron_suspend NULL
	#define wistron_resume NULL
	#endif

	static struct platform_driver wistron_driver = {
	.driver = {
	.name = "wistron-bios",
	.owner = THIS_MODULE,
	},
	.probe = wistron_probe,
	.remove = __devexit_p(wistron_remove),
	.suspend = wistron_suspend,
	.resume = wistron_resume,
	};

	static int __init wb_module_init(void)
	{
	int err;

	err = select_keymap();
	if (err)
	return err;

	err = map_bios();
	if (err)
	return err;

	err = platform_driver_register(&wistron_driver);
	if (err)
	goto err_unmap_bios;

	wistron_device = platform_device_alloc("wistron-bios", -1);
	if (!wistron_device) {
	err = -ENOMEM;
	goto err_unregister_driver;
	}

	err = platform_device_add(wistron_device);
	if (err)
	goto err_free_device;

	return 0;

	err_free_device:
	platform_device_put(wistron_device);
	err_unregister_driver:
	platform_driver_unregister(&wistron_driver);
	err_unmap_bios:
	unmap_bios();

	return err;
	}

	static void __exit wb_module_exit(void)
	{
	platform_device_unregister(wistron_device);
	platform_driver_unregister(&wistron_driver);
	unmap_bios();
	}

	module_init(wb_module_init);
	module_exit(wb_module_exit);