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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;
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