diff options
Diffstat (limited to 'recipes/linux/linux/acern30/n30-backlight.patch')
| -rw-r--r-- | recipes/linux/linux/acern30/n30-backlight.patch | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/recipes/linux/linux/acern30/n30-backlight.patch b/recipes/linux/linux/acern30/n30-backlight.patch new file mode 100644 index 0000000000..2b339960f7 --- /dev/null +++ b/recipes/linux/linux/acern30/n30-backlight.patch @@ -0,0 +1,97 @@ +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; + |