[PATCH 6/6] ARM: S5PV210: Add PWM backlight support on SMDKV210
From: Banajit Goswami <hidden>
Date: 2011-02-26 04:29:06
Also in:
linux-samsung-soc
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
This patch adds support for LCD backlight control using PWM timer for Samsung's SMDKV210 board. Signed-off-by: Banajit Goswami <redacted> --- arch/arm/mach-s5pv210/Kconfig | 1 + arch/arm/mach-s5pv210/mach-smdkv210.c | 46 +++++++++++++++++++++++++++++++++ 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 <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), (0x2 << 12)); + + 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 +270,11 @@ static struct platform_device *smdkv210_devices[] __initdata = { &samsung_device_keypad, &smdkv210_dm9000, &smdkv210_lcd_lte480wv, + &s3c_device_timer[0], + &s3c_device_timer[1], + &s3c_device_timer[2], + &s3c_device_timer[3], + &smdkv210_backlight_device, }; static void __init smdkv210_dm9000_init(void)
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1.6.5.2