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: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

4 files changed, 865 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-driver-samsung-laptop b/Documentation/ABI/testing/sysfs-driver-samsung-laptop
new file mode 100644
index 00000000000..0a810231aad
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-samsung-laptop
@@ -0,0 +1,19 @@
+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.
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 0253157085d..2ee442c2a5d 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -739,4 +739,17 @@ config XO15_EBOOK
           This switch is triggered as the screen is rotated and folded down to
           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
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 0f7b23c0714..029e8861d08 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -40,4 +40,5 @@ obj-$(CONFIG_GPIO_INTEL_PMIC)	+= intel_pmic_gpio.o
 obj-$(CONFIG_XO1_RFKILL)        += xo1-rfkill.o
 obj-$(CONFIG_XO15_EBOOK)        += xo15-ebook.o
 obj-$(CONFIG_IBM_RTL)           += ibm_rtl.o
+obj-$(CONFIG_SAMSUNG_LAPTOP)    += samsung-laptop.o
 obj-$(CONFIG_INTEL_MFLD_THERMAL)        += intel_mid_thermal.o
diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
new file mode 100644
index 00000000000..e0b390d45d8
--- /dev/null
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -0,0 +1,832 @@
+/*
+ * 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");