ARM: SAMSUNG: Add PWM backlight support on Samsung S5PC100

This patch adds support for LCD backlight using PWM timer for
Samsung SMDKC100 board.

Signed-off-by: Banajit Goswami <banajit.g@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

2 files changed, 45 insertions, 4 deletions

diff --git a/arch/arm/mach-s5pc100/Kconfig b/arch/arm/mach-s5pc100/Kconfig
index b8fbf2fcba6f..608722ff4f28 100644
--- a/arch/arm/mach-s5pc100/Kconfig
+++ b/arch/arm/mach-s5pc100/Kconfig
@@ -58,6 +58,7 @@ config MACH_SMDKC100
         select SAMSUNG_DEV_ADC
         select SAMSUNG_DEV_IDE
         select SAMSUNG_DEV_KEYPAD
+        select SAMSUNG_DEV_PWM
         select SAMSUNG_DEV_TS
         select S5PC100_SETUP_FB_24BPP
         select S5PC100_SETUP_I2C1
diff --git a/arch/arm/mach-s5pc100/mach-smdkc100.c b/arch/arm/mach-s5pc100/mach-smdkc100.c
index dd192a27524d..0525cb3ef406 100644
--- a/arch/arm/mach-s5pc100/mach-smdkc100.c
+++ b/arch/arm/mach-s5pc100/mach-smdkc100.c
@@ -23,12 +23,15 @@
 #include <linux/fb.h>
 #include <linux/delay.h>
 #include <linux/input.h>
+#include <linux/pwm_backlight.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 
 #include <mach/map.h>
 #include <mach/regs-fb.h>
+#include <mach/regs-gpio.h>
+
 #include <video/platform_lcd.h>
 
 #include <asm/irq.h>
@@ -107,9 +110,6 @@ static struct i2c_board_info i2c_devs1[] __initdata = {
 static void smdkc100_lcd_power_set(struct plat_lcd_data *pd,
                                    unsigned int power)
 {
-        /* backlight */
-        gpio_direction_output(S5PC100_GPD(0), power);
-
         if (power) {
                 /* module reset */
                 gpio_direction_output(S5PC100_GPH0(6), 1);
@@ -179,6 +179,45 @@ static struct samsung_keypad_platdata smdkc100_keypad_data __initdata = {
         .cols           = 8,
 };
 
+static int smdkc100_backlight_init(struct device *dev)
+{
+        int ret;
+
+        ret = gpio_request(S5PC100_GPD(0), "Backlight");
+        if (ret) {
+                printk(KERN_ERR "failed to request GPF for PWM-OUT0\n");
+                return ret;
+        }
+
+        /* Configure GPIO pin with S5PC100_GPD_TOUT_0 */
+        s3c_gpio_cfgpin(S5PC100_GPD(0), S3C_GPIO_SFN(2));
+
+        return 0;
+}
+
+static void smdkc100_backlight_exit(struct device *dev)
+{
+        s3c_gpio_cfgpin(S5PC100_GPD(0), S3C_GPIO_OUTPUT);
+        gpio_free(S5PC100_GPD(0));
+}
+
+static struct platform_pwm_backlight_data smdkc100_backlight_data = {
+        .pwm_id         = 0,
+        .max_brightness = 255,
+        .dft_brightness = 255,
+        .pwm_period_ns  = 78770,
+        .init           = smdkc100_backlight_init,
+        .exit           = smdkc100_backlight_exit,
+};
+
+static struct platform_device smdkc100_backlight_device = {
+        .name           = "pwm-backlight",
+        .dev            = {
+                .parent         = &s3c_device_timer[0].dev,
+                .platform_data  = &smdkc100_backlight_data,
+        },
+};
+
 static struct platform_device *smdkc100_devices[] __initdata = {
         &s3c_device_adc,
         &s3c_device_cfcon,
@@ -200,6 +239,8 @@ static struct platform_device *smdkc100_devices[] __initdata = {
         &s5p_device_fimc1,
         &s5p_device_fimc2,
         &s5pc100_device_spdif,
+        &s3c_device_timer[0],
+        &smdkc100_backlight_device,
 };
 
 static struct s3c2410_ts_mach_info s3c_ts_platform __initdata = {
@@ -233,7 +274,6 @@ static void __init smdkc100_machine_init(void)
         s5pc100_spdif_setup_gpio(S5PC100_SPDIF_GPD);
 
         /* LCD init */
-        gpio_request(S5PC100_GPD(0), "GPD");
         gpio_request(S5PC100_GPH0(6), "GPH0");
         smdkc100_lcd_power_set(&smdkc100_lcd_power_data, 0);
         platform_add_devices(smdkc100_devices, ARRAY_SIZE(smdkc100_devices));