driver-tutorial finished

interrupt/interrupt.c

@@ -0,0 +1,30 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <linux/interrupt.h>
+
+irqreturn_t myIRQ(int irq, void *devid){
+    //Clear pending interrupt
+    return IRQ_HANDLED;
+}
+
+int my_open(void){
+    //Set polarity and type of interrupt
+
+    //this is the api to register interrupt to
+    //kernel driver.
+    requet_irq(30, myIRQ, 0, "MYIRQ", 1);
+    //This 30 is the line number in interrupt register
+    //stored. It's like a id to the interrupt handler.
+    //The last line is the decive number. If multiple
+    //device uses same IRQ handler, then this last argument
+    //is used to diffrentiate between various devices using
+    //the same IRQ Handler.
+}
+
+void my_release(void){
+    //To release the interrupt handler
+    //free_irq api is used.
+    free_irq(30,1);
+}