Driver-tutorial/interrupt/interrupt.c

#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);
}