This patch adds a few functions to control the backlight on the n30.

Index: linux-2.6.14/arch/arm/mach-s3c2410/mach-n30.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-s3c2410/mach-n30.c
+++ linux-2.6.14/arch/arm/mach-s3c2410/mach-n30.c
@@ -45,8 +45,10 @@
 #include <asm/arch/regs-serial.h>
 #include <asm/arch/regs-gpio.h>
 #include <asm/arch/regs-lcd.h>
+#include <asm/arch/regs-timer.h>
 #include <asm/arch/iic.h>
 #include <asm/arch/fb.h>
+#include <asm/arch/lcd.h>
 
 #include <linux/serial_core.h>
 
@@ -121,9 +123,71 @@ static struct s3c2410fb_mach_info n30_lc
 	.bpp=		{16,16,16},
 };
 
+static void n30_backlight_power(int on)
+{
+	s3c2410_gpio_pullup(S3C2410_GPB1, 1);
+	s3c2410_gpio_cfgpin(S3C2410_GPB1, S3C2410_GPB1_OUTP);
+	s3c2410_gpio_setpin(S3C2410_GPB1, on);
+}
+
+static void n30_lcd_power(int on)
+{
+	/* Turning these off will save about 10mA */
+	s3c2410_gpio_setpin(S3C2410_GPB8, on); /* CLOCK driver? */
+	s3c2410_gpio_setpin(S3C2410_GPB9, on); /* VSYNC driver? */
+	s3c2410_gpio_setpin(S3C2410_GPB10, on); /* HSYYNC driver? */
+}
+
+#define BRIGHTNESS_MAX 28
+#define BRIGHTNESS_OFFSET 5
+
+static void n30_set_brightness(int level)
+{
+	unsigned long tcmpb0;
+	unsigned long tcon;
+
+	if (level < 0)
+		level = 0;
+
+	if (level > BRIGHTNESS_MAX)
+		level = BRIGHTNESS_MAX;
+
+	tcmpb0 = level ? level + BRIGHTNESS_OFFSET : 0;
+
+	printk("brightness level %d, tcmpb0 %lu\n", level, tcmpb0);
+
+	/* configure power on/off */
+	n30_backlight_power(level ? 1 : 0);
+
+	writel(34, S3C2410_TCNTB(0));
+
+	tcon = readl(S3C2410_TCON);
+	tcon &= ~0x0F;
+	tcon |= S3C2410_TCON_T0RELOAD;
+	tcon |= S3C2410_TCON_T0MANUALUPD;
+
+	writel(tcon, S3C2410_TCON);
+	writel(0x22, S3C2410_TCNTB(0));
+	writel(tcmpb0, S3C2410_TCMPB(0));
+
+	/* start the timer running */
+	tcon |= S3C2410_TCON_T0START;
+	tcon &= ~S3C2410_TCON_T0MANUALUPD;
+	writel(tcon, S3C2410_TCON);
+}
+
+static struct s3c2410_bl_mach_info n30_blcfg __initdata = {
+	.backlight_max          = BRIGHTNESS_MAX,
+	.backlight_default      = BRIGHTNESS_MAX / 2,
+	.backlight_power	= n30_backlight_power,
+	.set_brightness		= n30_set_brightness,
+	.lcd_power		= n30_lcd_power
+};
+
 static struct platform_device *n30_devices[] __initdata = {
 	&s3c_device_usb,
 	&s3c_device_lcd,
+	&s3c_device_bl,
 	&s3c_device_wdt,
 	&s3c_device_i2c,
 	&s3c_device_iis,
@@ -160,6 +224,7 @@ static void __init n30_init_irq(void)
 static void __init n30_init(void)
 {
 	s3c24xx_fb_set_platdata(&n30_lcdcfg);
+	set_s3c2410bl_info(&n30_blcfg);
 
 	s3c_device_i2c.dev.platform_data = &n30_i2ccfg;