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| author | Banajit Goswami <banajit.g@samsung.com> | 2011-02-28 17:42:35 +0530 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2011-03-03 10:10:07 +0900 |
| commit | 075d108989f71e6c7c287c258ebc3faf53066458 (patch) | |
| tree | 94be22831252b6dbc5117b9195915c73e4140744 /arch/arm/mach-s3c64xx | |
| parent | 2ce30137094969123a8846ca4f68c2628ea4a658 (diff) | |
| download | linux-075d108989f71e6c7c287c258ebc3faf53066458.tar.gz linux-075d108989f71e6c7c287c258ebc3faf53066458.tar.bz2 linux-075d108989f71e6c7c287c258ebc3faf53066458.zip | |
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>
Diffstat (limited to 'arch/arm/mach-s3c64xx')
| -rw-r--r-- | arch/arm/mach-s3c64xx/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/mach-s3c64xx/mach-smdk6410.c | 46 |
2 files changed, 44 insertions, 3 deletions
diff --git a/arch/arm/mach-s3c64xx/Kconfig b/arch/arm/mach-s3c64xx/Kconfig index f3a953f02dd6..e4177e22557b 100644 --- a/arch/arm/mach-s3c64xx/Kconfig +++ b/arch/arm/mach-s3c64xx/Kconfig @@ -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 diff --git a/arch/arm/mach-s3c64xx/mach-smdk6410.c b/arch/arm/mach-s3c64xx/mach-smdk6410.c index e85192a86fbe..6639cced5f79 100644 --- a/arch/arm/mach-s3c64xx/mach-smdk6410.c +++ b/arch/arm/mach-s3c64xx/mach-smdk6410.c @@ -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)); |