From mboxrd@z Thu Jan 1 00:00:00 1970 From: banajit.g@samsung.com (Banajit Goswami) Date: Wed, 2 Mar 2011 16:27:27 +0900 Subject: [PATCH V2 6/6] ARM: SAMSUNG: Add PWM backlight support on Samsung S5PV210 In-Reply-To: <1299050847-16148-1-git-send-email-banajit.g@samsung.com> References: <1299050847-16148-1-git-send-email-banajit.g@samsung.com> Message-ID: <1299050847-16148-5-git-send-email-banajit.g@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This patch adds support for LCD backlight control using PWM timer for Samsung's SMDKV210 board. Signed-off-by: Banajit Goswami --- Changes since v1: - Used common GPIO macro - Removed redundant timers arch/arm/mach-s5pv210/Kconfig | 1 + arch/arm/mach-s5pv210/mach-smdkv210.c | 43 +++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig index 53aabef..d7fd031 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 bc9fdb5..8833e7b 100644 --- a/arch/arm/mach-s5pv210/mach-smdkv210.c +++ b/arch/arm/mach-s5pv210/mach-smdkv210.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -43,6 +44,7 @@ #include #include #include +#include /* 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) -- 1.6.5.2