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ARM: SAMSUNG: Add PWM backlight support on Samsung S5PV210

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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>
This commit is contained in:
Banajit Goswami 2011-02-28 23:02:32 +05:30 committed by Kukjin Kim
parent baa0c06093
commit 5cd435b4ab
2 changed files with 44 additions and 0 deletions
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1
arch/arm/mach-s5pv210/Kconfig
View file

@ -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

43
arch/arm/mach-s5pv210/mach-smdkv210.c
View file

@ -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), 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 @@ static struct platform_device *smdkv210_devices[] __initdata = {
&samsung_device_keypad,
&smdkv210_dm9000,
&smdkv210_lcd_lte480wv,
&s3c_device_timer[3],
&smdkv210_backlight_device,
};
static void __init smdkv210_dm9000_init(void)