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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>
This commit is contained in:
Banajit Goswami 2011-02-28 20:37:21 +05:30 committed by Kukjin Kim
parent b0fd644f44
commit baa0c06093
2 changed files with 45 additions and 4 deletions
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1
arch/arm/mach-s5pc100/Kconfig
View File

@ -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

48
arch/arm/mach-s5pc100/mach-smdkc100.c
View File

@ -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));