[PATCH 5/6] ARM: S5PC100: Add PWM backlight support on SMDKC100
From: Banajit Goswami <hidden>
Date: 2011-02-26 04:29:05
Also in:
linux-samsung-soc
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
This patch adds support for LCD backlight using PWM timer for Samsung SMDKC100 board. Signed-off-by: Banajit Goswami <redacted> --- arch/arm/mach-s5pc100/Kconfig | 1 + arch/arm/mach-s5pc100/mach-smdkc100.c | 48 ++++++++++++++++++++++++++++++--- 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 +178,44 @@ 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), (0x2 << 0)); + + 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 +238,9 @@ static struct platform_device *smdkc100_devices[] __initdata = { &s5p_device_fimc1, &s5p_device_fimc2, &s5pc100_device_spdif, + &s3c_device_timer[0], + &s3c_device_timer[1], + &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));
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1.6.5.2