[ARM] 4793/1: S3C24XX: Add IRQ->GPIO pin mapping function

Add the reverse of s3c2410_gpio_getirq to convert a IRQ number into a GPIO pin number. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
mariux64 · Jan 28, 2008 · c27cb68 · c27cb68
1 parent 9b8c008
commit c27cb68
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diff --git a/arch/arm/plat-s3c24xx/gpio.c b/arch/arm/plat-s3c24xx/gpio.c
@@ -199,3 +199,19 @@ int s3c2410_gpio_getirq(unsigned int pin)
 }
 
 EXPORT_SYMBOL(s3c2410_gpio_getirq);
+
+int s3c2410_gpio_irq2pin(unsigned int irq)
+{
+	if (irq >= IRQ_EINT0 && irq <= IRQ_EINT3)
+		return S3C2410_GPF0 + (irq - IRQ_EINT0);
+
+	if (irq >= IRQ_EINT4 && irq <= IRQ_EINT7)
+		return S3C2410_GPF4 + (irq - IRQ_EINT4);
+
+	if (irq >= IRQ_EINT8 && irq <= IRQ_EINT23)
+		return S3C2410_GPG0 + (irq - IRQ_EINT8);
+
+	return -EINVAL;
+}
+
+EXPORT_SYMBOL(s3c2410_gpio_irq2pin);
diff --git a/include/asm-arm/arch-s3c2410/hardware.h b/include/asm-arm/arch-s3c2410/hardware.h
@@ -50,6 +50,17 @@ extern unsigned int s3c2410_gpio_getcfg(unsigned int pin);
 
 extern int s3c2410_gpio_getirq(unsigned int pin);
 
+/* s3c2410_gpio_irq2pin
+ *
+ * turn the given irq number into the corresponding GPIO number
+ *
+ * returns:
+ *	< 0 = no pin
+ *	>=0 = gpio pin number
+*/
+
+extern int s3c2410_gpio_irq2pin(unsigned int irq);
+
 #ifdef CONFIG_CPU_S3C2400
 
 extern int s3c2400_gpio_getirq(unsigned int pin);