This patch adds support for LCD backlight control using PWM timer for Samsung's SMDKC210 board. Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx> --- Changes since v1: - fixed wrong function name. arch/arm/mach-exynos4/Kconfig | 1 + arch/arm/mach-exynos4/mach-smdkc210.c | 43 +++++++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig index a021b52..1b49b36 100644 --- a/arch/arm/mach-exynos4/Kconfig +++ b/arch/arm/mach-exynos4/Kconfig @@ -100,6 +100,7 @@ config MACH_SMDKC210 select S3C_DEV_HSMMC1 select S3C_DEV_HSMMC2 select S3C_DEV_HSMMC3 + select SAMSUNG_DEV_PWM select EXYNOS4_DEV_PD select EXYNOS4_DEV_SYSMMU select EXYNOS4_SETUP_I2C1 diff --git a/arch/arm/mach-exynos4/mach-smdkc210.c b/arch/arm/mach-exynos4/mach-smdkc210.c index 25a2568..7993f37 100644 --- a/arch/arm/mach-exynos4/mach-smdkc210.c +++ b/arch/arm/mach-exynos4/mach-smdkc210.c @@ -15,6 +15,7 @@ #include <linux/smsc911x.h> #include <linux/io.h> #include <linux/i2c.h> +#include <linux/pwm_backlight.h> #include <asm/mach/arch.h> #include <asm/mach-types.h> @@ -27,6 +28,7 @@ #include <plat/sdhci.h> #include <plat/iic.h> #include <plat/pd.h> +#include <plat/gpio-cfg.h> #include <mach/map.h> @@ -146,6 +148,45 @@ static struct i2c_board_info i2c_devs1[] __initdata = { {I2C_BOARD_INFO("wm8994", 0x1a),}, }; +static int smdkc210_backlight_init(struct device *dev) +{ + int ret; + + ret = gpio_request(EXYNOS4_GPD0(1), "Backlight"); + if (ret) { + printk(KERN_ERR "failed to request GPD for PWM-OUT 1\n"); + return ret; + } + + /* Configure GPIO pin with EXYNOS4_GPD_0_1_TOUT_1 */ + s3c_gpio_cfgpin(EXYNOS4_GPD0(1), S3C_GPIO_SFN(2)); + + return 0; +} + +static void smdkc210_backlight_exit(struct device *dev) +{ + s3c_gpio_cfgpin(EXYNOS4_GPD0(1), S3C_GPIO_OUTPUT); + gpio_free(EXYNOS4_GPD0(1)); +} + +static struct platform_pwm_backlight_data smdkc210_backlight_data = { + .pwm_id = 1, + .max_brightness = 255, + .dft_brightness = 255, + .pwm_period_ns = 78770, + .init = smdkc210_backlight_init, + .exit = smdkc210_backlight_exit, +}; + +static struct platform_device smdkc210_backlight_device = { + .name = "pwm-backlight", + .dev = { + .parent = &s3c_device_timer[1].dev, + .platform_data = &smdkc210_backlight_data, + }, +}; + static struct platform_device *smdkc210_devices[] __initdata = { &s3c_device_hsmmc0, &s3c_device_hsmmc1, @@ -166,6 +207,8 @@ static struct platform_device *smdkc210_devices[] __initdata = { &exynos4_device_sysmmu, &samsung_asoc_dma, &smdkc210_smsc911x, + &s3c_device_timer[1], + &smdkc210_backlight_device, }; static void __init smdkc210_smsc911x_init(void) -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html