This patch adds support for LCD backlight control using PWM timer
for Samsung's SMDKC210 board.
Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
---
arch/arm/mach-exynos4/Kconfig | 1 +
arch/arm/mach-exynos4/mach-smdkc210.c | 43 +++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig
index a021b52..1b49b36 100644
--- a/arch/arm/mach-exynos4/Kconfig
+++ b/arch/arm/mach-exynos4/Kconfig
@@ -100,6 +100,7 @@ config MACH_SMDKC210
select S3C_DEV_HSMMC1
select S3C_DEV_HSMMC2
select S3C_DEV_HSMMC3
+ select SAMSUNG_DEV_PWM
select EXYNOS4_DEV_PD
select EXYNOS4_DEV_SYSMMU
select EXYNOS4_SETUP_I2C1
diff --git a/arch/arm/mach-exynos4/mach-smdkc210.c b/arch/arm/mach-exynos4/mach-smdkc210.c
index 25a2568..eac47dc 100644
--- a/arch/arm/mach-exynos4/mach-smdkc210.c
+++ b/arch/arm/mach-exynos4/mach-smdkc210.c
@@ -15,6 +15,7 @@
#include <linux/smsc911x.h>
#include <linux/io.h>
#include <linux/i2c.h>
+#include <linux/pwm_backlight.h>
#include <asm/mach/arch.h>
#include <asm/mach-types.h>
@@ -27,6 +28,7 @@
#include <plat/sdhci.h>
#include <plat/iic.h>
#include <plat/pd.h>
+#include <plat/gpio-cfg.h>
#include <mach/map.h>
@@ -146,6 +148,45 @@ static struct i2c_board_info i2c_devs1[] __initdata = {
{I2C_BOARD_INFO("wm8994", 0x1a),},
};
+static int smdkv310_backlight_init(struct device *dev)
+{
+ int ret;
+
+ ret = gpio_request(EXYNOS4_GPD0(1), "Backlight");
+ if (ret) {
+ printk(KERN_ERR "failed to request GPD for PWM-OUT 1\n");
+ return ret;
+ }
+
+ /* Configure GPIO pin with EXYNOS4_GPD_0_1_TOUT_1 */
+ s3c_gpio_cfgpin(EXYNOS4_GPD0(1), S3C_GPIO_SFN(2));
+
+ return 0;
+}
+
+static void smdkv310_backlight_exit(struct device *dev)
+{
+ s3c_gpio_cfgpin(EXYNOS4_GPD0(1), S3C_GPIO_OUTPUT);
+ gpio_free(EXYNOS4_GPD0(1));
+}
+
+static struct platform_pwm_backlight_data smdkv310_backlight_data = {
+ .pwm_id = 1,
+ .max_brightness = 255,
+ .dft_brightness = 255,
+ .pwm_period_ns = 78770,
+ .init = smdkv310_backlight_init,
+ .exit = smdkv310_backlight_exit,
+};
+
+static struct platform_device smdkv310_backlight_device = {
+ .name = "pwm-backlight",
+ .dev = {
+ .parent = &s3c_device_timer[1].dev,
+ .platform_data = &smdkv310_backlight_data,
+ },
+};
+
static struct platform_device *smdkc210_devices[] __initdata = {
&s3c_device_hsmmc0,
&s3c_device_hsmmc1,
@@ -166,6 +207,8 @@ static struct platform_device *smdkc210_devices[] __initdata = {
&exynos4_device_sysmmu,
&samsung_asoc_dma,
&smdkc210_smsc911x,
+ &s3c_device_timer[1],
+ &smdkv310_backlight_device,
};
static void __init smdkc210_smsc911x_init(void)
--
1.7.1
--
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