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Commit 2d70b73a authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman Committed by Matthew Garrett
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Platform: add Samsung Laptop platform driver 



This adds the samsung-laptop driver to the kernel.  It now supports
all known Samsung laptops that use the SABI interface.

Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
parent 298f19b2

Documentation/ABI/testing/sysfs-driver-samsung-laptop

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+19 −0
Original line number Original line Diff line number Diff line 
What:		/sys/devices/platform/samsung/performance_level

Date:		January 1, 2010

KernelVersion:	2.6.33

Contact:	Greg Kroah-Hartman <gregkh@suse.de>

Description:	Some Samsung laptops have different "performance levels"

		that are can be modified by a function key, and by this

		sysfs file.  These values don't always make a whole lot

		of sense, but some users like to modify them to keep

		their fans quiet at all costs.  Reading from this file

		will show the current performance level.  Writing to the

		file can change this value.

			Valid options:

				"silent"

				"normal"

				"overclock"

		Note that not all laptops support all of these options.

		Specifically, not all support the "overclock" option,

		and it's still unknown if this value even changes

		anything, other than making the user feel a bit better.

drivers/platform/x86/Kconfig

+13 −0
Original line number Original line Diff line number Diff line
@@ -739,4 +739,17 @@ config XO15_EBOOK 
	  This switch is triggered as the screen is rotated and folded down to

	  This switch is triggered as the screen is rotated and folded down to

	  convert the device into ebook form.

	  convert the device into ebook form.





config SAMSUNG_LAPTOP

	tristate "Samsung Laptop driver"

	depends on RFKILL && BACKLIGHT_CLASS_DEVICE && X86

	---help---

	  This module implements a driver for a wide range of different

	  Samsung laptops.  It offers control over the different

	  function keys, wireless LED, LCD backlight level, and

	  sometimes provides a "performance_control" sysfs file to allow

	  the performance level of the laptop to be changed.



	  To compile this driver as a module, choose M here: the module

	  will be called samsung-laptop.



endif # X86_PLATFORM_DEVICES
 
endif # X86_PLATFORM_DEVICES

drivers/platform/x86/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -40,4 +40,5 @@ obj-$(CONFIG_GPIO_INTEL_PMIC) += intel_pmic_gpio.o 
obj-$(CONFIG_XO1_RFKILL)	+= xo1-rfkill.o

obj-$(CONFIG_XO1_RFKILL)	+= xo1-rfkill.o

obj-$(CONFIG_XO15_EBOOK)	+= xo15-ebook.o

obj-$(CONFIG_XO15_EBOOK)	+= xo15-ebook.o

obj-$(CONFIG_IBM_RTL)		+= ibm_rtl.o

obj-$(CONFIG_IBM_RTL)		+= ibm_rtl.o

obj-$(CONFIG_SAMSUNG_LAPTOP)	+= samsung-laptop.o

obj-$(CONFIG_INTEL_MFLD_THERMAL)	+= intel_mid_thermal.o
 
obj-$(CONFIG_INTEL_MFLD_THERMAL)	+= intel_mid_thermal.o

drivers/platform/x86/samsung-laptop.c

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+832 −0
Original line number Original line Diff line number Diff line 
/*

 * Samsung Laptop driver

 *

 * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)

 * Copyright (C) 2009,2011 Novell Inc.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt



#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/pci.h>

#include <linux/backlight.h>

#include <linux/fb.h>

#include <linux/dmi.h>

#include <linux/platform_device.h>

#include <linux/rfkill.h>



/*

 * This driver is needed because a number of Samsung laptops do not hook

 * their control settings through ACPI.  So we have to poke around in the

 * BIOS to do things like brightness values, and "special" key controls.

 */



/*

 * We have 0 - 8 as valid brightness levels.  The specs say that level 0 should

 * be reserved by the BIOS (which really doesn't make much sense), we tell

 * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8

 */

#define MAX_BRIGHT	0x07





#define SABI_IFACE_MAIN			0x00

#define SABI_IFACE_SUB			0x02

#define SABI_IFACE_COMPLETE		0x04

#define SABI_IFACE_DATA			0x05



/* Structure to get data back to the calling function */

struct sabi_retval {

	u8 retval[20];

};



struct sabi_header_offsets {

	u8 port;

	u8 re_mem;

	u8 iface_func;

	u8 en_mem;

	u8 data_offset;

	u8 data_segment;

};



struct sabi_commands {

	/*

	 * Brightness is 0 - 8, as described above.

	 * Value 0 is for the BIOS to use

	 */

	u8 get_brightness;

	u8 set_brightness;



	/*

	 * first byte:

	 * 0x00 - wireless is off

	 * 0x01 - wireless is on

	 * second byte:

	 * 0x02 - 3G is off

	 * 0x03 - 3G is on

	 * TODO, verify 3G is correct, that doesn't seem right...

	 */

	u8 get_wireless_button;

	u8 set_wireless_button;



	/* 0 is off, 1 is on */

	u8 get_backlight;

	u8 set_backlight;



	/*

	 * 0x80 or 0x00 - no action

	 * 0x81 - recovery key pressed

	 */

	u8 get_recovery_mode;

	u8 set_recovery_mode;



	/*

	 * on seclinux: 0 is low, 1 is high,

	 * on swsmi: 0 is normal, 1 is silent, 2 is turbo

	 */

	u8 get_performance_level;

	u8 set_performance_level;



	/*

	 * Tell the BIOS that Linux is running on this machine.

	 * 81 is on, 80 is off

	 */

	u8 set_linux;

};



struct sabi_performance_level {

	const char *name;

	u8 value;

};



struct sabi_config {

	const char *test_string;

	u16 main_function;

	const struct sabi_header_offsets header_offsets;

	const struct sabi_commands commands;

	const struct sabi_performance_level performance_levels[4];

	u8 min_brightness;

	u8 max_brightness;

};



static const struct sabi_config sabi_configs[] = {

	{

		.test_string = "SECLINUX",



		.main_function = 0x4c49,



		.header_offsets = {

			.port = 0x00,

			.re_mem = 0x02,

			.iface_func = 0x03,

			.en_mem = 0x04,

			.data_offset = 0x05,

			.data_segment = 0x07,

		},



		.commands = {

			.get_brightness = 0x00,

			.set_brightness = 0x01,



			.get_wireless_button = 0x02,

			.set_wireless_button = 0x03,



			.get_backlight = 0x04,

			.set_backlight = 0x05,



			.get_recovery_mode = 0x06,

			.set_recovery_mode = 0x07,



			.get_performance_level = 0x08,

			.set_performance_level = 0x09,



			.set_linux = 0x0a,

		},



		.performance_levels = {

			{

				.name = "silent",

				.value = 0,

			},

			{

				.name = "normal",

				.value = 1,

			},

			{ },

		},

		.min_brightness = 1,

		.max_brightness = 8,

	},

	{

		.test_string = "SwSmi@",



		.main_function = 0x5843,



		.header_offsets = {

			.port = 0x00,

			.re_mem = 0x04,

			.iface_func = 0x02,

			.en_mem = 0x03,

			.data_offset = 0x05,

			.data_segment = 0x07,

		},



		.commands = {

			.get_brightness = 0x10,

			.set_brightness = 0x11,



			.get_wireless_button = 0x12,

			.set_wireless_button = 0x13,



			.get_backlight = 0x2d,

			.set_backlight = 0x2e,



			.get_recovery_mode = 0xff,

			.set_recovery_mode = 0xff,



			.get_performance_level = 0x31,

			.set_performance_level = 0x32,



			.set_linux = 0xff,

		},



		.performance_levels = {

			{

				.name = "normal",

				.value = 0,

			},

			{

				.name = "silent",

				.value = 1,

			},

			{

				.name = "overclock",

				.value = 2,

			},

			{ },

		},

		.min_brightness = 0,

		.max_brightness = 8,

	},

	{ },

};



static const struct sabi_config *sabi_config;



static void __iomem *sabi;

static void __iomem *sabi_iface;

static void __iomem *f0000_segment;

static struct backlight_device *backlight_device;

static struct mutex sabi_mutex;

static struct platform_device *sdev;

static struct rfkill *rfk;



static int force;

module_param(force, bool, 0);

MODULE_PARM_DESC(force,

		"Disable the DMI check and forces the driver to be loaded");



static int debug;

module_param(debug, bool, S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(debug, "Debug enabled or not");



static int sabi_get_command(u8 command, struct sabi_retval *sretval)

{

	int retval = 0;

	u16 port = readw(sabi + sabi_config->header_offsets.port);

	u8 complete, iface_data;



	mutex_lock(&sabi_mutex);



	/* enable memory to be able to write to it */

	outb(readb(sabi + sabi_config->header_offsets.en_mem), port);



	/* write out the command */

	writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);

	writew(command, sabi_iface + SABI_IFACE_SUB);

	writeb(0, sabi_iface + SABI_IFACE_COMPLETE);

	outb(readb(sabi + sabi_config->header_offsets.iface_func), port);



	/* write protect memory to make it safe */

	outb(readb(sabi + sabi_config->header_offsets.re_mem), port);



	/* see if the command actually succeeded */

	complete = readb(sabi_iface + SABI_IFACE_COMPLETE);

	iface_data = readb(sabi_iface + SABI_IFACE_DATA);

	if (complete != 0xaa || iface_data == 0xff) {

		pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",

		        command, complete, iface_data);

		retval = -EINVAL;

		goto exit;

	}

	/*

	 * Save off the data into a structure so the caller use it.

	 * Right now we only want the first 4 bytes,

	 * There are commands that need more, but not for the ones we

	 * currently care about.

	 */

	sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);

	sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);

	sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);

	sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);



exit:

	mutex_unlock(&sabi_mutex);

	return retval;



}



static int sabi_set_command(u8 command, u8 data)

{

	int retval = 0;

	u16 port = readw(sabi + sabi_config->header_offsets.port);

	u8 complete, iface_data;



	mutex_lock(&sabi_mutex);



	/* enable memory to be able to write to it */

	outb(readb(sabi + sabi_config->header_offsets.en_mem), port);



	/* write out the command */

	writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);

	writew(command, sabi_iface + SABI_IFACE_SUB);

	writeb(0, sabi_iface + SABI_IFACE_COMPLETE);

	writeb(data, sabi_iface + SABI_IFACE_DATA);

	outb(readb(sabi + sabi_config->header_offsets.iface_func), port);



	/* write protect memory to make it safe */

	outb(readb(sabi + sabi_config->header_offsets.re_mem), port);



	/* see if the command actually succeeded */

	complete = readb(sabi_iface + SABI_IFACE_COMPLETE);

	iface_data = readb(sabi_iface + SABI_IFACE_DATA);

	if (complete != 0xaa || iface_data == 0xff) {

		pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",

		       command, complete, iface_data);

		retval = -EINVAL;

	}



	mutex_unlock(&sabi_mutex);

	return retval;

}



static void test_backlight(void)

{

	struct sabi_retval sretval;



	sabi_get_command(sabi_config->commands.get_backlight, &sretval);

	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);



	sabi_set_command(sabi_config->commands.set_backlight, 0);

	printk(KERN_DEBUG "backlight should be off\n");



	sabi_get_command(sabi_config->commands.get_backlight, &sretval);

	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);



	msleep(1000);



	sabi_set_command(sabi_config->commands.set_backlight, 1);

	printk(KERN_DEBUG "backlight should be on\n");



	sabi_get_command(sabi_config->commands.get_backlight, &sretval);

	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);

}



static void test_wireless(void)

{

	struct sabi_retval sretval;



	sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);

	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);



	sabi_set_command(sabi_config->commands.set_wireless_button, 0);

	printk(KERN_DEBUG "wireless led should be off\n");



	sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);

	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);



	msleep(1000);



	sabi_set_command(sabi_config->commands.set_wireless_button, 1);

	printk(KERN_DEBUG "wireless led should be on\n");



	sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);

	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);

}



static u8 read_brightness(void)

{

	struct sabi_retval sretval;

	int user_brightness = 0;

	int retval;



	retval = sabi_get_command(sabi_config->commands.get_brightness,

				  &sretval);

	if (!retval) {

		user_brightness = sretval.retval[0];

		if (user_brightness != 0)

			user_brightness -= sabi_config->min_brightness;

	}

	return user_brightness;

}



static void set_brightness(u8 user_brightness)

{

	u8 user_level = user_brightness - sabi_config->min_brightness;



	sabi_set_command(sabi_config->commands.set_brightness, user_level);

}



static int get_brightness(struct backlight_device *bd)

{

	return (int)read_brightness();

}



static int update_status(struct backlight_device *bd)

{

	set_brightness(bd->props.brightness);



	if (bd->props.power == FB_BLANK_UNBLANK)

		sabi_set_command(sabi_config->commands.set_backlight, 1);

	else

		sabi_set_command(sabi_config->commands.set_backlight, 0);

	return 0;

}



static const struct backlight_ops backlight_ops = {

	.get_brightness	= get_brightness,

	.update_status	= update_status,

};



static int rfkill_set(void *data, bool blocked)

{

	/* Do something with blocked...*/

	/*

	 * blocked == false is on

	 * blocked == true is off

	 */

	if (blocked)

		sabi_set_command(sabi_config->commands.set_wireless_button, 0);

	else

		sabi_set_command(sabi_config->commands.set_wireless_button, 1);



	return 0;

}



static struct rfkill_ops rfkill_ops = {

	.set_block = rfkill_set,

};



static int init_wireless(struct platform_device *sdev)

{

	int retval;



	rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,

			   &rfkill_ops, NULL);

	if (!rfk)

		return -ENOMEM;



	retval = rfkill_register(rfk);

	if (retval) {

		rfkill_destroy(rfk);

		return -ENODEV;

	}



	return 0;

}



static void destroy_wireless(void)

{

	rfkill_unregister(rfk);

	rfkill_destroy(rfk);

}



static ssize_t get_performance_level(struct device *dev,

				     struct device_attribute *attr, char *buf)

{

	struct sabi_retval sretval;

	int retval;

	int i;



	/* Read the state */

	retval = sabi_get_command(sabi_config->commands.get_performance_level,

				  &sretval);

	if (retval)

		return retval;



	/* The logic is backwards, yeah, lots of fun... */

	for (i = 0; sabi_config->performance_levels[i].name; ++i) {

		if (sretval.retval[0] == sabi_config->performance_levels[i].value)

			return sprintf(buf, "%s\n", sabi_config->performance_levels[i].name);

	}

	return sprintf(buf, "%s\n", "unknown");

}



static ssize_t set_performance_level(struct device *dev,

				struct device_attribute *attr, const char *buf,

				size_t count)

{

	if (count >= 1) {

		int i;

		for (i = 0; sabi_config->performance_levels[i].name; ++i) {

			const struct sabi_performance_level *level =

				&sabi_config->performance_levels[i];

			if (!strncasecmp(level->name, buf, strlen(level->name))) {

				sabi_set_command(sabi_config->commands.set_performance_level,

						 level->value);

				break;

			}

		}

		if (!sabi_config->performance_levels[i].name)

			return -EINVAL;

	}

	return count;

}

static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,

		   get_performance_level, set_performance_level);





static int __init dmi_check_cb(const struct dmi_system_id *id)

{

	pr_info("found laptop model '%s'\n",

		id->ident);

	return 0;

}



static struct dmi_system_id __initdata samsung_dmi_table[] = {

	{

		.ident = "N128",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "N128"),

			DMI_MATCH(DMI_BOARD_NAME, "N128"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "N130",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "N130"),

			DMI_MATCH(DMI_BOARD_NAME, "N130"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "X125",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "X125"),

			DMI_MATCH(DMI_BOARD_NAME, "X125"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "X120/X170",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"),

			DMI_MATCH(DMI_BOARD_NAME, "X120/X170"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "NC10",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "NC10"),

			DMI_MATCH(DMI_BOARD_NAME, "NC10"),

		},

		.callback = dmi_check_cb,

	},

		{

		.ident = "NP-Q45",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"),

			DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"),

		},

		.callback = dmi_check_cb,

		},

	{

		.ident = "X360",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "X360"),

			DMI_MATCH(DMI_BOARD_NAME, "X360"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "R518",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "R518"),

			DMI_MATCH(DMI_BOARD_NAME, "R518"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "R519/R719",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"),

			DMI_MATCH(DMI_BOARD_NAME, "R519/R719"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "N150/N210/N220",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),

			DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "N150P/N210P/N220P",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"),

			DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "R530/R730",

		.matches = {

		      DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),

		      DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"),

		      DMI_MATCH(DMI_BOARD_NAME, "R530/R730"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "NF110/NF210/NF310",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),

			DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "N145P/N250P/N260P",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),

			DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "R70/R71",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR,

					"SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"),

			DMI_MATCH(DMI_BOARD_NAME, "R70/R71"),

		},

		.callback = dmi_check_cb,

	},

	{

		.ident = "P460",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),

			DMI_MATCH(DMI_PRODUCT_NAME, "P460"),

			DMI_MATCH(DMI_BOARD_NAME, "P460"),

		},

		.callback = dmi_check_cb,

	},

	{ },

};

MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);



static int find_signature(void __iomem *memcheck, const char *testStr)

{

	int i = 0;

	int loca;



	for (loca = 0; loca < 0xffff; loca++) {

		char temp = readb(memcheck + loca);



		if (temp == testStr[i]) {

			if (i == strlen(testStr)-1)

				break;

			++i;

		} else {

			i = 0;

		}

	}

	return loca;

}



static int __init samsung_init(void)

{

	struct backlight_properties props;

	struct sabi_retval sretval;

	unsigned int ifaceP;

	int i;

	int loca;

	int retval;



	mutex_init(&sabi_mutex);



	if (!force && !dmi_check_system(samsung_dmi_table))

		return -ENODEV;



	f0000_segment = ioremap_nocache(0xf0000, 0xffff);

	if (!f0000_segment) {

		pr_err("Can't map the segment at 0xf0000\n");

		return -EINVAL;

	}



	/* Try to find one of the signatures in memory to find the header */

	for (i = 0; sabi_configs[i].test_string != 0; ++i) {

		sabi_config = &sabi_configs[i];

		loca = find_signature(f0000_segment, sabi_config->test_string);

		if (loca != 0xffff)

			break;

	}



	if (loca == 0xffff) {

		pr_err("This computer does not support SABI\n");

		goto error_no_signature;

	}



	/* point to the SMI port Number */

	loca += 1;

	sabi = (f0000_segment + loca);



	if (debug) {

		printk(KERN_DEBUG "This computer supports SABI==%x\n",

			loca + 0xf0000 - 6);

		printk(KERN_DEBUG "SABI header:\n");

		printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",

			readw(sabi + sabi_config->header_offsets.port));

		printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",

			readb(sabi + sabi_config->header_offsets.iface_func));

		printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",

			readb(sabi + sabi_config->header_offsets.en_mem));

		printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",

			readb(sabi + sabi_config->header_offsets.re_mem));

		printk(KERN_DEBUG " SABI data offset = 0x%04x\n",

			readw(sabi + sabi_config->header_offsets.data_offset));

		printk(KERN_DEBUG " SABI data segment = 0x%04x\n",

			readw(sabi + sabi_config->header_offsets.data_segment));

	}



	/* Get a pointer to the SABI Interface */

	ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4;

	ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff;

	sabi_iface = ioremap_nocache(ifaceP, 16);

	if (!sabi_iface) {

		pr_err("Can't remap %x\n", ifaceP);

		goto exit;

	}

	if (debug) {

		printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);

		printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);



		test_backlight();

		test_wireless();



		retval = sabi_get_command(sabi_config->commands.get_brightness,

					  &sretval);

		printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);

	}



	/* Turn on "Linux" mode in the BIOS */

	if (sabi_config->commands.set_linux != 0xff) {

		retval = sabi_set_command(sabi_config->commands.set_linux,

					  0x81);

		if (retval) {

			pr_warn("Linux mode was not set!\n");

			goto error_no_platform;

		}

	}



	/* knock up a platform device to hang stuff off of */

	sdev = platform_device_register_simple("samsung", -1, NULL, 0);

	if (IS_ERR(sdev))

		goto error_no_platform;



	/* create a backlight device to talk to this one */

	memset(&props, 0, sizeof(struct backlight_properties));

	props.max_brightness = sabi_config->max_brightness;

	backlight_device = backlight_device_register("samsung", &sdev->dev,

						     NULL, &backlight_ops,

						     &props);

	if (IS_ERR(backlight_device))

		goto error_no_backlight;



	backlight_device->props.brightness = read_brightness();

	backlight_device->props.power = FB_BLANK_UNBLANK;

	backlight_update_status(backlight_device);



	retval = init_wireless(sdev);

	if (retval)

		goto error_no_rfk;



	retval = device_create_file(&sdev->dev, &dev_attr_performance_level);

	if (retval)

		goto error_file_create;



exit:

	return 0;



error_file_create:

	destroy_wireless();



error_no_rfk:

	backlight_device_unregister(backlight_device);



error_no_backlight:

	platform_device_unregister(sdev);



error_no_platform:

	iounmap(sabi_iface);



error_no_signature:

	iounmap(f0000_segment);

	return -EINVAL;

}



static void __exit samsung_exit(void)

{

	/* Turn off "Linux" mode in the BIOS */

	if (sabi_config->commands.set_linux != 0xff)

		sabi_set_command(sabi_config->commands.set_linux, 0x80);



	device_remove_file(&sdev->dev, &dev_attr_performance_level);

	backlight_device_unregister(backlight_device);

	destroy_wireless();

	iounmap(sabi_iface);

	iounmap(f0000_segment);

	platform_device_unregister(sdev);

}



module_init(samsung_init);

module_exit(samsung_exit);



MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");

MODULE_DESCRIPTION("Samsung Backlight driver");

MODULE_LICENSE("GPL");