[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>

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);