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| author | Banajit Goswami <banajit.g@samsung.com> | 2011-02-28 20:31:27 +0530 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2011-03-03 10:10:07 +0900 |
| commit | fec524aa05775b1582644f54842c6a30a9b7bbe5 (patch) | |
| tree | 1b4bf20e02c278e794a435021063dcc5e7bda536 /arch/arm | |
| parent | 075d108989f71e6c7c287c258ebc3faf53066458 (diff) | |
| download | linux-fec524aa05775b1582644f54842c6a30a9b7bbe5.tar.gz linux-fec524aa05775b1582644f54842c6a30a9b7bbe5.tar.bz2 linux-fec524aa05775b1582644f54842c6a30a9b7bbe5.zip | |
ARM: SAMSUNG: Add PWM backlight support on Samsung S5P6440
This patch adds support for LCD backlight control using PWM timer
for Samsung SMDK6440 board.
Signed-off-by: Banajit Goswami <banajit.g@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-s5p64x0/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/mach-s5p64x0/mach-smdk6440.c | 43 |
2 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/mach-s5p64x0/Kconfig b/arch/arm/mach-s5p64x0/Kconfig index 164d2783d381..be5888a0e20b 100644 --- a/arch/arm/mach-s5p64x0/Kconfig +++ b/arch/arm/mach-s5p64x0/Kconfig @@ -34,6 +34,7 @@ config MACH_SMDK6440 select S3C_DEV_WDT select S3C64XX_DEV_SPI select SAMSUNG_DEV_ADC + select SAMSUNG_DEV_PWM select SAMSUNG_DEV_TS select S5P64X0_SETUP_I2C1 help diff --git a/arch/arm/mach-s5p64x0/mach-smdk6440.c b/arch/arm/mach-s5p64x0/mach-smdk6440.c index e5beb84e2393..366dca4ec794 100644 --- a/arch/arm/mach-s5p64x0/mach-smdk6440.c +++ b/arch/arm/mach-s5p64x0/mach-smdk6440.c @@ -22,6 +22,7 @@ #include <linux/module.h> #include <linux/clk.h> #include <linux/gpio.h> +#include <linux/pwm_backlight.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> @@ -32,6 +33,7 @@ #include <mach/map.h> #include <mach/regs-clock.h> #include <mach/i2c.h> +#include <mach/regs-gpio.h> #include <plat/regs-serial.h> #include <plat/gpio-cfg.h> @@ -88,6 +90,45 @@ static struct s3c2410_uartcfg smdk6440_uartcfgs[] __initdata = { }, }; +static int smdk6440_backlight_init(struct device *dev) +{ + int ret; + + ret = gpio_request(S5P6440_GPF(15), "Backlight"); + if (ret) { + printk(KERN_ERR "failed to request GPF for PWM-OUT1\n"); + return ret; + } + + /* Configure GPIO pin with S5P6440_GPF15_PWM_TOUT1 */ + s3c_gpio_cfgpin(S5P6440_GPF(15), S3C_GPIO_SFN(2)); + + return 0; +} + +static void smdk6440_backlight_exit(struct device *dev) +{ + s3c_gpio_cfgpin(S5P6440_GPF(15), S3C_GPIO_OUTPUT); + gpio_free(S5P6440_GPF(15)); +} + +static struct platform_pwm_backlight_data smdk6440_backlight_data = { + .pwm_id = 1, + .max_brightness = 255, + .dft_brightness = 255, + .pwm_period_ns = 78770, + .init = smdk6440_backlight_init, + .exit = smdk6440_backlight_exit, +}; + +static struct platform_device smdk6440_backlight_device = { + .name = "pwm-backlight", + .dev = { + .parent = &s3c_device_timer[1].dev, + .platform_data = &smdk6440_backlight_data, + }, +}; + static struct platform_device *smdk6440_devices[] __initdata = { &s3c_device_adc, &s3c_device_rtc, @@ -97,6 +138,8 @@ static struct platform_device *smdk6440_devices[] __initdata = { &s3c_device_wdt, &samsung_asoc_dma, &s5p6440_device_iis, + &s3c_device_timer[1], + &smdk6440_backlight_device, }; static struct s3c2410_platform_i2c s5p6440_i2c0_data __initdata = { |