[PATCH 228/235] Staging: add Samsung Laptop driver
Joey Lee
jlee at novell.com
Sat Dec 12 04:20:00 UTC 2009
Hi Greg,
It's my honour to work with you for this.
Regards
Joey Lee
於 五，2009-12-11 於 14:29 -0800，Greg Kroah-Hartman 提到：
> This is a drive for the Samsung N128 laptop to control the wireless LED
> and backlight.
>
> Many thanks to Joey Lee for his help in testing and finding all of my
> bugs in the development of this driver, it has been invaluable.
>
> Cc: Joey Lee <jlee at novell.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
> ---
> drivers/staging/Kconfig | 2 +
> drivers/staging/Makefile | 1 +
> drivers/staging/samsung-laptop/Kconfig | 10 +
> drivers/staging/samsung-laptop/Makefile | 1 +
> drivers/staging/samsung-laptop/samsung-laptop.c | 582 +++++++++++++++++++++++
> 5 files changed, 596 insertions(+), 0 deletions(-)
> create mode 100644 drivers/staging/samsung-laptop/Kconfig
> create mode 100644 drivers/staging/samsung-laptop/Makefile
> create mode 100644 drivers/staging/samsung-laptop/samsung-laptop.c
>
> diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
> index d30fa45..a44ac2e 100644
> --- a/drivers/staging/Kconfig
> +++ b/drivers/staging/Kconfig
> @@ -131,6 +131,8 @@ source "drivers/staging/wlags49_h25/Kconfig"
>
> source "drivers/staging/batman-adv/Kconfig"
>
> +source "drivers/staging/samsung-laptop/Kconfig"
> +
> source "drivers/staging/strip/Kconfig"
>
> source "drivers/staging/arlan/Kconfig"
> diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
> index 910e55d..069864f 100644
> --- a/drivers/staging/Makefile
> +++ b/drivers/staging/Makefile
> @@ -47,6 +47,7 @@ obj-$(CONFIG_RAMZSWAP) += ramzswap/
> obj-$(CONFIG_WLAGS49_H2) += wlags49_h2/
> obj-$(CONFIG_WLAGS49_H25) += wlags49_h25/
> obj-$(CONFIG_BATMAN_ADV) += batman-adv/
> +obj-$(CONFIG_SAMSUNG_LAPTOP) += samsung-laptop/
> obj-$(CONFIG_STRIP) += strip/
> obj-$(CONFIG_ARLAN) += arlan/
> obj-$(CONFIG_WAVELAN) += wavelan/
> diff --git a/drivers/staging/samsung-laptop/Kconfig b/drivers/staging/samsung-laptop/Kconfig
> new file mode 100644
> index 0000000..f27c608
> --- /dev/null
> +++ b/drivers/staging/samsung-laptop/Kconfig
> @@ -0,0 +1,10 @@
> +config SAMSUNG_LAPTOP
> + tristate "Samsung Laptop driver"
> + default n
> + depends on RFKILL && BACKLIGHT_CLASS_DEVICE && X86
> + help
> + This module implements a driver for the N128 Samsung Laptop
> + providing control over the Wireless LED and the LCD backlight
> +
> + To compile this driver as a module, choose
> + M here: the module will be called samsung-laptop.
> diff --git a/drivers/staging/samsung-laptop/Makefile b/drivers/staging/samsung-laptop/Makefile
> new file mode 100644
> index 0000000..3c6f420
> --- /dev/null
> +++ b/drivers/staging/samsung-laptop/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_SAMSUNG_LAPTOP) += samsung-laptop.o
> diff --git a/drivers/staging/samsung-laptop/samsung-laptop.c b/drivers/staging/samsung-laptop/samsung-laptop.c
> new file mode 100644
> index 0000000..253b447
> --- /dev/null
> +++ b/drivers/staging/samsung-laptop/samsung-laptop.c
> @@ -0,0 +1,582 @@
> +/*
> + * Samsung N130 Laptop driver
> + *
> + * Copyright (C) 2009 Greg Kroah-Hartman (gregkh at suse.de)
> + * Copyright (C) 2009 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.
> + *
> + */
> +#include <linux/version.h>
> +#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
> +
> +/* Brightness is 0 - 8, as described above. Value 0 is for the BIOS to use */
> +#define GET_BRIGHTNESS 0x00
> +#define SET_BRIGHTNESS 0x01
> +
> +/* 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...
> + */
> +#define GET_WIRELESS_BUTTON 0x02
> +#define SET_WIRELESS_BUTTON 0x03
> +
> +/* 0 is off, 1 is on */
> +#define GET_BACKLIGHT 0x04
> +#define SET_BACKLIGHT 0x05
> +
> +/*
> + * 0x80 or 0x00 - no action
> + * 0x81 - recovery key pressed
> + */
> +#define GET_RECOVERY_METHOD 0x06
> +#define SET_RECOVERY_METHOD 0x07
> +
> +/* 0 is low, 1 is high */
> +#define GET_PERFORMANCE_LEVEL 0x08
> +#define SET_PERFORMANCE_LEVEL 0x09
> +
> +/*
> + * Tell the BIOS that Linux is running on this machine.
> + * 81 is on, 80 is off
> + */
> +#define SET_LINUX 0x0a
> +
> +
> +#define MAIN_FUNCTION 0x4c49
> +
> +#define SABI_HEADER_PORT 0x00
> +#define SABI_HEADER_RE_MEM 0x02
> +#define SABI_HEADER_IFACEFUNC 0x03
> +#define SABI_HEADER_EN_MEM 0x04
> +#define SABI_HEADER_DATA_OFFSET 0x05
> +#define SABI_HEADER_DATA_SEGMENT 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];
> +};
> +
> +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_HEADER_PORT);
> +
> + mutex_lock(&sabi_mutex);
> +
> + /* enable memory to be able to write to it */
> + outb(readb(sabi + SABI_HEADER_EN_MEM), port);
> +
> + /* write out the command */
> + writew(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_HEADER_IFACEFUNC), port);
> +
> + /* write protect memory to make it safe */
> + outb(readb(sabi + SABI_HEADER_RE_MEM), port);
> +
> + /* see if the command actually succeeded */
> + if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
> + readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
> + /*
> + * It did!
> + * Save off the data into a structure so the caller use it.
> + * Right now we only care about the first 4 bytes,
> + * I suppose there are commands that need more, but I don't
> + * know about them.
> + */
> + 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);
> + goto exit;
> + }
> +
> + /* Something bad happened, so report it and error out */
> + printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
> + command, readb(sabi_iface + SABI_IFACE_COMPLETE),
> + readb(sabi_iface + SABI_IFACE_DATA));
> + retval = -EINVAL;
> +exit:
> + mutex_unlock(&sabi_mutex);
> + return retval;
> +
> +}
> +
> +static int sabi_set_command(u8 command, u8 data)
> +{
> + int retval = 0;
> + u16 port = readw(sabi + SABI_HEADER_PORT);
> +
> + mutex_lock(&sabi_mutex);
> +
> + /* enable memory to be able to write to it */
> + outb(readb(sabi + SABI_HEADER_EN_MEM), port);
> +
> + /* write out the command */
> + writew(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_HEADER_IFACEFUNC), port);
> +
> + /* write protect memory to make it safe */
> + outb(readb(sabi + SABI_HEADER_RE_MEM), port);
> +
> + /* see if the command actually succeeded */
> + if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
> + readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
> + /* it did! */
> + goto exit;
> + }
> +
> + /* Something bad happened, so report it and error out */
> + printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
> + command, readb(sabi_iface + SABI_IFACE_COMPLETE),
> + readb(sabi_iface + SABI_IFACE_DATA));
> + retval = -EINVAL;
> +exit:
> + mutex_unlock(&sabi_mutex);
> + return retval;
> +}
> +
> +static void test_backlight(void)
> +{
> + struct sabi_retval sretval;
> +
> + sabi_get_command(GET_BACKLIGHT, &sretval);
> + printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
> +
> + sabi_set_command(SET_BACKLIGHT, 0);
> + printk(KERN_DEBUG "backlight should be off\n");
> +
> + sabi_get_command(GET_BACKLIGHT, &sretval);
> + printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
> +
> + msleep(1000);
> +
> + sabi_set_command(SET_BACKLIGHT, 1);
> + printk(KERN_DEBUG "backlight should be on\n");
> +
> + sabi_get_command(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(GET_WIRELESS_BUTTON, &sretval);
> + printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
> +
> + sabi_set_command(SET_WIRELESS_BUTTON, 0);
> + printk(KERN_DEBUG "wireless led should be off\n");
> +
> + sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
> + printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
> +
> + msleep(1000);
> +
> + sabi_set_command(SET_WIRELESS_BUTTON, 1);
> + printk(KERN_DEBUG "wireless led should be on\n");
> +
> + sabi_get_command(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(GET_BRIGHTNESS, &sretval);
> + if (!retval)
> + user_brightness = sretval.retval[0];
> + if (user_brightness != 0)
> + --user_brightness;
> + return user_brightness;
> +}
> +
> +static void set_brightness(u8 user_brightness)
> +{
> + sabi_set_command(SET_BRIGHTNESS, user_brightness + 1);
> +}
> +
> +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(SET_BACKLIGHT, 1);
> + else
> + sabi_set_command(SET_BACKLIGHT, 0);
> + return 0;
> +}
> +
> +static struct backlight_ops backlight_ops = {
> + .get_brightness = get_brightness,
> + .update_status = update_status,
> +};
> +
> +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)
> +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(SET_WIRELESS_BUTTON, 0);
> + else
> + sabi_set_command(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);
> +}
> +
> +#else
> +
> +static int rfkill_set(void *data, enum rfkill_state state)
> +{
> + if (state == RFKILL_STATE_UNBLOCKED)
> + sabi_set_command(SET_WIRELESS_BUTTON, 1);
> + else
> + sabi_set_command(SET_WIRELESS_BUTTON, 0);
> +
> + return 0;
> +}
> +
> +static int init_wireless(struct platform_device *sdev)
> +{
> + int retval;
> +
> + rfk = rfkill_allocate(&sdev->dev, RFKILL_TYPE_WLAN);
> + if (!rfk)
> + return -ENOMEM;
> + rfk->toggle_radio = rfkill_set;
> + rfk->name = "samsung-wifi";
> +
> + retval = rfkill_register(rfk);
> + if (retval) {
> + rfkill_free(rfk);
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +static void destroy_wireless(void)
> +{
> + rfkill_unregister(rfk);
> +}
> +
> +#endif
> +
> +static ssize_t get_silent_state(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct sabi_retval sretval;
> + int retval;
> +
> + /* Read the state */
> + retval = sabi_get_command(GET_PERFORMANCE_LEVEL, &sretval);
> + if (retval)
> + return retval;
> +
> + /* The logic is backwards, yeah, lots of fun... */
> + if (sretval.retval[0] == 0)
> + retval = 1;
> + else
> + retval = 0;
> + return sprintf(buf, "%d\n", retval);
> +}
> +
> +static ssize_t set_silent_state(struct device *dev,
> + struct device_attribute *attr, const char *buf,
> + size_t count)
> +{
> + char value;
> +
> + if (count >= 1) {
> + value = buf[0];
> + if ((value == '0') || (value == 'n') || (value == 'N')) {
> + /* Turn speed up */
> + sabi_set_command(SET_PERFORMANCE_LEVEL, 0x01);
> + } else if ((value == '1') || (value == 'y') || (value == 'Y')) {
> + /* Turn speed down */
> + sabi_set_command(SET_PERFORMANCE_LEVEL, 0x00);
> + } else {
> + return -EINVAL;
> + }
> + }
> + return count;
> +}
> +static DEVICE_ATTR(silent, S_IWUGO | S_IRUGO,
> + get_silent_state, set_silent_state);
> +
> +
> +static int __init dmi_check_cb(const struct dmi_system_id *id)
> +{
> + printk(KERN_INFO KBUILD_MODNAME ": 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,
> + },
> + { },
> +};
> +MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
> +
> +static int __init samsung_init(void)
> +{
> + struct sabi_retval sretval;
> + const char *testStr = "SECLINUX";
> + void __iomem *memcheck;
> + unsigned int ifaceP;
> + int pStr;
> + int loca;
> + int retval;
> +
> + mutex_init(&sabi_mutex);
> +
> + if (!force && !dmi_check_system(samsung_dmi_table))
> + return -ENODEV;
> +
> + f0000_segment = ioremap(0xf0000, 0xffff);
> + if (!f0000_segment) {
> + printk(KERN_ERR "Can't map the segment at 0xf0000\n");
> + return -EINVAL;
> + }
> +
> + /* Try to find the signature "SECLINUX" in memory to find the header */
> + pStr = 0;
> + memcheck = f0000_segment;
> + for (loca = 0; loca < 0xffff; loca++) {
> + char temp = readb(memcheck + loca);
> +
> + if (temp == testStr[pStr]) {
> + if (pStr == strlen(testStr)-1)
> + break;
> + ++pStr;
> + } else {
> + pStr = 0;
> + }
> + }
> + if (loca == 0xffff) {
> + printk(KERN_ERR "This computer does not support SABI\n");
> + goto error_no_signature;
> + }
> +
> + /* point to the SMI port Number */
> + loca += 1;
> + sabi = (memcheck + 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_HEADER_PORT));
> + printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
> + readb(sabi + SABI_HEADER_IFACEFUNC));
> + printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
> + readb(sabi + SABI_HEADER_EN_MEM));
> + printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
> + readb(sabi + SABI_HEADER_RE_MEM));
> + printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
> + readw(sabi + SABI_HEADER_DATA_OFFSET));
> + printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
> + readw(sabi + SABI_HEADER_DATA_SEGMENT));
> + }
> +
> + /* Get a pointer to the SABI Interface */
> + ifaceP = (readw(sabi + SABI_HEADER_DATA_SEGMENT) & 0x0ffff) << 4;
> + ifaceP += readw(sabi + SABI_HEADER_DATA_OFFSET) & 0x0ffff;
> + sabi_iface = ioremap(ifaceP, 16);
> + if (!sabi_iface) {
> + printk(KERN_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(GET_BRIGHTNESS, &sretval);
> + printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
> + }
> +
> + /* Turn on "Linux" mode in the BIOS */
> + retval = sabi_set_command(SET_LINUX, 0x81);
> + if (retval) {
> + printk(KERN_ERR KBUILD_MODNAME ": 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 */
> + backlight_device = backlight_device_register("samsung", &sdev->dev,
> + NULL, &backlight_ops);
> + if (IS_ERR(backlight_device))
> + goto error_no_backlight;
> +
> + backlight_device->props.max_brightness = MAX_BRIGHT;
> + 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_silent);
> + 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 */
> + sabi_set_command(SET_LINUX, 0x80);
> +
> + device_remove_file(&sdev->dev, &dev_attr_silent);
> + 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 at suse.de>");
> +MODULE_DESCRIPTION("Samsung Backlight driver");
> +MODULE_LICENSE("GPL");
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