현재 등록된 인터럽트 번호를 확인해 보면 다음과 같습니다. 

[root@falinux intdev]$ cat /proc/interrupts
           CPU0
  2:          7    Au1000 Level  MMC
  3:          0    Au1000 Level  Au1xxx dbdma
 29:          1    Au1000 Level  ehci_hcd:usb1, ohci_hcd:usb2
 30:          0    Au1000 Level  lcd
 34:        493  Au1000 Fall Edge  eth0
 42:          0    Au1000 Level  wm9712 TouchScreen 0.30

ERR:          0

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TEST 파일 내용
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#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>

#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/fcntl.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/interrupt.h>

#include </project/falinux/kernel/linux/include/asm-mips/mach-au1x00/au1000.h>
#include </jjyprog/work/Kseg1RegMap.h>

void Int_Init(void); 
int Int_init(void);
int Int_open(struct inode *inode,struct file *filp);
void Int_Clear(void);
int Int_release(struct inode *inode,struct file *filp);

int Test;

struct file_operations int_fos=
{
 .owner=THIS_MODULE,
 .open=Int_open,
 .release=Int_release,
};

//------------------------------------------------------------------------------------
//- 인터럽트 서비스 함수 !
//------------------------------------------------------------------------------------
irqreturn_t Int_interrupt(int irq,void *dev_id,struct pt_regs *regs)
{
   printk(" interrupt event !! n"); 
   Int_Clear();
   
 return
  IRQ_HANDLED;
} 

int Int_open(struct inode *inode,struct file *filp)
{
 int Result;
 
 printk(" Int dev Open ! n"); 

 return
  Result;

} 

int Int_release(struct inode *inode,struct file *filp)
{
 printk(" interrupt release ! n"); 
 //---------------------------------------
 //- 인터럽트 서비스 함수 해제 !
 //--------------------------------------- 
 free_irq(IRQ_GPIO_1,NULL);
 //--------------------------------------- 
 return
  0;
} 

int Int_init(void)
{
 int result;
 int result_sub;
 
 int irq_num;
 
 result=register_chrdev(DEV_INT1_MAJOR,DEV_NAME_INT1,&int_fos);
 if(result<0) return result;
 else{
  result_sub=request_irq(IRQ_GPIO_1,Int_interrupt,SA_INTERRUPT,DEV_NAME_INT1,NULL);
  if(result_sub==0){
   printk(" request irq Set ! n"); 
   //-----------------------------------------------------
   //-  Falling Edge Enable !
   //-----------------------------------------------------
   *((volatile unsigned long *)IC1_CFG2CLR)=1<<14;
   *((volatile unsigned long *)IC1_CFG1SET)=1<<14;
   *((volatile unsigned long *)IC1_CFG0CLR)=1<<14;
   //-----------------------------------------------------
   //- Falling Edge Detect bit clear !
   //-----------------------------------------------------
   *((volatile unsigned long *)IC1_FALLINGCLR)=1<<14;
   //-----------------------------------------------------
   //- Use the peripheral interrupt or GPIO signal
   //- as interrupt source !
   //-----------------------------------------------------
   *((volatile unsigned long *)IC1_SRCSET)=1<<14;
   //-----------------------------------------------------
   //- Assigns interrupt to request 1 ???
   //-----------------------------------------------------
   *((volatile unsigned long *)IC1_ASSIGNSET)=1<<14;
   //-----------------------------------------------------
   //- interrupt enable
   //-----------------------------------------------------
   *((volatile unsigned long *)IC1_MASKSET)=1<<14;
  } 
  else{
   printk(" Irq request error=%d n",result_sub); 
  } 
 }
 return 0;
} 

void Int_Clear(void)
{
 *((volatile unsigned long *)IC1_FALLINGCLR)=1<<14;
} 

void Int_exit(void)
{
 unregister_chrdev(DEV_INT1_MAJOR,DEV_NAME_INT1);
 //-----------------------------------------------------
 //- interrupt disable
 //-----------------------------------------------------
 *((volatile unsigned long *)IC1_MASKCLR)=1<<14;
 //-----------------------------------------------------
 printk(" Int1 dev remove !! n"); 
 //---------------------------------------
 //- 인터럽트 서비스 함수 해제 !
 //--------------------------------------- 
 free_irq(IRQ_GPIO_1,NULL);
 //--------------------------------------- 
} 
module_init(Int_init);
module_exit(Int_exit);

MODULE_LICENSE("Dual BSD/GPL");

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상기 내용에서 RQ_GPIO_1 는 헤더파일에서 46으로 정의 했구요 
insmod로 드라이버를 적재하면 다음 에러 메세지가 보입니다. 
Irq request error=-89
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