diff options
| author | Ben Dooks | 2008-01-28 13:01:23 +0100 |
|---|---|---|
| committer | Russell King | 2008-01-28 13:20:51 +0000 |
| commit | bb6d9b56c1d5c1cbff39b7c337c900e2b3d8387a (patch) | |
| tree | 7ceb92448f96f99f590f16a22b0e6cb66b9ff744 | |
| parent | 9f613be4a9b6d680772b0a52a43a4a94d8e131b6 (diff) | |
[ARM] 4783/1: S3C24XX: Add s3c2410_gpio_getpull()
Add the call s3c2410_gpio_getpull() to return the
current state of the pin's pull-up.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/plat-s3c24xx/gpio.c | 13 | ||||
| -rw-r--r-- | include/asm-arm/arch-s3c2410/hardware.h | 12 |
2 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c24xx/gpio.c b/arch/arm/plat-s3c24xx/gpio.c index ec3a09c4d181..7cc6faec25d9 100644 --- a/arch/arm/plat-s3c24xx/gpio.c +++ b/arch/arm/plat-s3c24xx/gpio.c @@ -122,6 +122,19 @@ void s3c2410_gpio_pullup(unsigned int pin, unsigned int to) EXPORT_SYMBOL(s3c2410_gpio_pullup); +int s3c2410_gpio_getpull(unsigned int pin) +{ + void __iomem *base = S3C24XX_GPIO_BASE(pin); + unsigned long offs = S3C2410_GPIO_OFFSET(pin); + + if (pin < S3C2410_GPIO_BANKB) + return -EINVAL; + + return (__raw_readl(base + 0x08) & (1L << offs)) ? 1 : 0; +} + +EXPORT_SYMBOL(s3c2410_gpio_getpull); + void s3c2410_gpio_setpin(unsigned int pin, unsigned int to) { void __iomem *base = S3C24XX_GPIO_BASE(pin); diff --git a/include/asm-arm/arch-s3c2410/hardware.h b/include/asm-arm/arch-s3c2410/hardware.h index faeaba514ffe..20509e4540f6 100644 --- a/include/asm-arm/arch-s3c2410/hardware.h +++ b/include/asm-arm/arch-s3c2410/hardware.h @@ -87,6 +87,18 @@ extern int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on, extern void s3c2410_gpio_pullup(unsigned int pin, unsigned int to); +/* s3c2410_gpio_getpull + * + * Read the state of the pull-up on a given pin + * + * return: + * < 0 => error code + * 0 => enabled + * 1 => disabled +*/ + +extern int s3c2410_gpio_getpull(unsigned int pin); + extern void s3c2410_gpio_setpin(unsigned int pin, unsigned int to); extern unsigned int s3c2410_gpio_getpin(unsigned int pin); |