This patch adds support for LCD backlight using PWM timer for
Samsung SMDKC100 board.
Signed-off-by: Banajit Goswami <banaji...@samsung.com>
---
Changes since v1:
- Used common GPIO macro
- Removed redundant timers
arch/arm/mach-s5pc100/Kconfig | 1 +
arch/arm/mach-s5pc100/mach-smdkc100.c | 49 ++++++++++++++++++++++++++++++---
2 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-s5pc100/Kconfig b/arch/arm/mach-s5pc100/Kconfig
index b8fbf2f..608722f 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 dd192a2..22d5348 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);
@@ -178,6 +178,45 @@ static struct samsung_keypad_platdata smdkc100_keypad_data
__initdata = {
.rows = 2,
.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,
@@ -200,6 +238,8 @@ 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));
--
1.6.5.2
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