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| author | Banajit Goswami <banajit.g@samsung.com> | 2011-02-28 20:32:32 +0300 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2011-03-03 04:10:10 +0300 |
| commit | 5cd435b4ab881280fb0b8ce6686cfceb005d98c8 (patch) | |
| tree | e46a1dce2cad190f215691dea76494f1213bbd25 /arch/arm/mach-s5pv210 | |
| parent | baa0c0609307e46531e9d5d6f5b9a510ceb8e30c (diff) | |
| download | linux-5cd435b4ab881280fb0b8ce6686cfceb005d98c8.tar.xz | |
ARM: SAMSUNG: Add PWM backlight support on Samsung S5PV210
This patch adds support for LCD backlight control using PWM timer
for Samsung's SMDKV210 board.
Signed-off-by: Banajit Goswami <banajit.g@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/mach-s5pv210')
| -rw-r--r-- | arch/arm/mach-s5pv210/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/mach-s5pv210/mach-smdkv210.c | 43 |
2 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig index 53aabef1e9ce..d7fd031f6015 100644 --- a/arch/arm/mach-s5pv210/Kconfig +++ b/arch/arm/mach-s5pv210/Kconfig @@ -130,6 +130,7 @@ config MACH_SMDKV210 select SAMSUNG_DEV_ADC select SAMSUNG_DEV_IDE select SAMSUNG_DEV_KEYPAD + select SAMSUNG_DEV_PWM select SAMSUNG_DEV_TS select S5PV210_SETUP_FB_24BPP select S5PV210_SETUP_I2C1 diff --git a/arch/arm/mach-s5pv210/mach-smdkv210.c b/arch/arm/mach-s5pv210/mach-smdkv210.c index bc9fdb52a020..2b5f48806c57 100644 --- a/arch/arm/mach-s5pv210/mach-smdkv210.c +++ b/arch/arm/mach-s5pv210/mach-smdkv210.c @@ -18,6 +18,7 @@ #include <linux/fb.h> #include <linux/gpio.h> #include <linux/delay.h> +#include <linux/pwm_backlight.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> @@ -43,6 +44,7 @@ #include <plat/keypad.h> #include <plat/pm.h> #include <plat/fb.h> +#include <plat/gpio-cfg.h> /* Following are default values for UCON, ULCON and UFCON UART registers */ #define SMDKV210_UCON_DEFAULT (S3C2410_UCON_TXILEVEL | \ @@ -208,6 +210,45 @@ static struct s3c_fb_platdata smdkv210_lcd0_pdata __initdata = { .setup_gpio = s5pv210_fb_gpio_setup_24bpp, }; +static int smdkv210_backlight_init(struct device *dev) +{ + int ret; + + ret = gpio_request(S5PV210_GPD0(3), "Backlight"); + if (ret) { + printk(KERN_ERR "failed to request GPD for PWM-OUT 3\n"); + return ret; + } + + /* Configure GPIO pin with S5PV210_GPD_0_3_TOUT_3 */ + s3c_gpio_cfgpin(S5PV210_GPD0(3), S3C_GPIO_SFN(2)); + + return 0; +} + +static void smdkv210_backlight_exit(struct device *dev) +{ + s3c_gpio_cfgpin(S5PV210_GPD0(3), S3C_GPIO_OUTPUT); + gpio_free(S5PV210_GPD0(3)); +} + +static struct platform_pwm_backlight_data smdkv210_backlight_data = { + .pwm_id = 3, + .max_brightness = 255, + .dft_brightness = 255, + .pwm_period_ns = 78770, + .init = smdkv210_backlight_init, + .exit = smdkv210_backlight_exit, +}; + +static struct platform_device smdkv210_backlight_device = { + .name = "pwm-backlight", + .dev = { + .parent = &s3c_device_timer[3].dev, + .platform_data = &smdkv210_backlight_data, + }, +}; + static struct platform_device *smdkv210_devices[] __initdata = { &s3c_device_adc, &s3c_device_cfcon, @@ -229,6 +270,8 @@ static struct platform_device *smdkv210_devices[] __initdata = { &samsung_device_keypad, &smdkv210_dm9000, &smdkv210_lcd_lte480wv, + &s3c_device_timer[3], + &smdkv210_backlight_device, }; static void __init smdkv210_dm9000_init(void) |