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>
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 @@
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..2b5f488 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 @@
.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 @@
&samsung_device_keypad,
&smdkv210_dm9000,
&smdkv210_lcd_lte480wv,
+ &s3c_device_timer[3],
+ &smdkv210_backlight_device,
};
static void __init smdkv210_dm9000_init(void)