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ARM: SAMSUNG: Add PWM backlight support on Samsung S3C6410 

This patch adds support for LCD backlight using PWM timer for
Samsung SMDK6410 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 17:42:35 +05:30 committed by Kukjin Kim
parent 2ce3013709
commit 075d108989
2 changed files with 44 additions and 3 deletions
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1
arch/arm/mach-s3c64xx/Kconfig
View File

@ -143,6 +143,7 @@ config MACH_SMDK6410
select S3C_DEV_USB_HSOTG
select S3C_DEV_WDT
select SAMSUNG_DEV_KEYPAD
select SAMSUNG_DEV_PWM
select HAVE_S3C2410_WATCHDOG if WATCHDOG
select S3C64XX_SETUP_SDHCI
select S3C64XX_SETUP_I2C1

46
arch/arm/mach-s3c64xx/mach-smdk6410.c
View File

@ -28,6 +28,7 @@
#include <linux/delay.h>
#include <linux/smsc911x.h>
#include <linux/regulator/fixed.h>
#include <linux/pwm_backlight.h>
#ifdef CONFIG_SMDK6410_WM1190_EV1
#include <linux/mfd/wm8350/core.h>
@ -48,6 +49,7 @@
#include <mach/hardware.h>
#include <mach/regs-fb.h>
#include <mach/map.h>
#include <mach/gpio-bank-f.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
@ -118,7 +120,6 @@ static void smdk6410_lcd_power_set(struct plat_lcd_data *pd,
{
if (power) {
gpio_direction_output(S3C64XX_GPF(13), 1);
gpio_direction_output(S3C64XX_GPF(15), 1);
/* fire nRESET on power up */
gpio_direction_output(S3C64XX_GPN(5), 0);
@ -126,7 +127,6 @@ static void smdk6410_lcd_power_set(struct plat_lcd_data *pd,
gpio_direction_output(S3C64XX_GPN(5), 1);
msleep(1);
} else {
gpio_direction_output(S3C64XX_GPF(15), 0);
gpio_direction_output(S3C64XX_GPF(13), 0);
}
}
@ -269,6 +269,45 @@ static struct samsung_keypad_platdata smdk6410_keypad_data __initdata = {
.cols = 8,
};
static int smdk6410_backlight_init(struct device *dev)
{
int ret;
ret = gpio_request(S3C64XX_GPF(15), "Backlight");
if (ret) {
printk(KERN_ERR "failed to request GPF for PWM-OUT1\n");
return ret;
}
/* Configure GPIO pin with S3C64XX_GPF15_PWM_TOUT1 */
s3c_gpio_cfgpin(S3C64XX_GPF(15), S3C_GPIO_SFN(2));
return 0;
}
static void smdk6410_backlight_exit(struct device *dev)
{
s3c_gpio_cfgpin(S3C64XX_GPF(15), S3C_GPIO_OUTPUT);
gpio_free(S3C64XX_GPF(15));
}
static struct platform_pwm_backlight_data smdk6410_backlight_data = {
.pwm_id = 1,
.max_brightness = 255,
.dft_brightness = 255,
.pwm_period_ns = 78770,
.init = smdk6410_backlight_init,
.exit = smdk6410_backlight_exit,
};
static struct platform_device smdk6410_backlight_device = {
.name = "pwm-backlight",
.dev = {
.parent = &s3c_device_timer[1].dev,
.platform_data = &smdk6410_backlight_data,
},
};
static struct map_desc smdk6410_iodesc[] = {};
static struct platform_device *smdk6410_devices[] __initdata = {
@ -298,6 +337,8 @@ static struct platform_device *smdk6410_devices[] __initdata = {
&s3c_device_rtc,
&s3c_device_ts,
&s3c_device_wdt,
&s3c_device_timer[1],
&smdk6410_backlight_device,
};
#ifdef CONFIG_REGULATOR
@ -693,7 +734,6 @@ static void __init smdk6410_machine_init(void)
gpio_request(S3C64XX_GPN(5), "LCD power");
gpio_request(S3C64XX_GPF(13), "LCD power");
gpio_request(S3C64XX_GPF(15), "LCD power");
i2c_register_board_info(0, i2c_devs0, ARRAY_SIZE(i2c_devs0));
i2c_register_board_info(1, i2c_devs1, ARRAY_SIZE(i2c_devs1));