共享中断还是有冲突

我用的华天正电子科技生产的RealARM开发板，移植他提供的linux系统（2.4.18）。里面带了触摸屏驱动，我想再加上ADC驱动。但是加了ADC驱动到内核后，触摸屏不能使用了，没有反应。今天我试了把触摸屏驱动里的中断和ADC驱动里的中断设置成共享中断。还是加了ADC到内核，触摸屏不能使用。这是为什么呢？
我现在把我的驱动贴出来：
ADC驱动：
/*
* s3c2410-adc.c
*
* S3C2410 ADC
* exclusive with s3c2410-ts.c
*
* Author: SeonKon Choi <bushi@mizi.com>
* Date : $Date: 2003/01/20 14:24:49 $
*
* $Revision: 1.1.2.6 $
*
2004-6-14 add a device by threewater<threewater@up-tech.com>

Fri Dec 03 2002 SeonKon Choi <bushi@mizi.com>
- initial

*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <linux/sched.h>
#include <linux/irq.h>
#include <linux/delay.h>

#include <asm/hardware.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>

#include "s3c2410-adc.h"

#undef DEBUG
//#define DEBUG
#ifdef DEBUG
#define DPRINTK(x...) {printk(__FUNCTION__"(%d): ",__LINE__);printk(##x);}
#else
#define DPRINTK(x...) (void)(0)
#endif

#define DEVICE_NAME "s3c2410-adc"
#define ADCRAW_MINOR 1

static int adcMajor = 0;

typedef struct {
struct semaphore lock;
wait_queue_head_t wait;
int channel;
int prescale;
}ADC_DEV;

static ADC_DEV adcdev;

#define START_ADC_AIN(ch, prescale) \
do{ \
ADCCON = PRESCALE_EN | PRSCVL(prescale) | ADC_INPUT((ch)) ; \
ADCCON |= ADC_START; \
}while(0)

static void adcdone_int_handler(int irq, void *dev_id, struct pt_regs *reg)
{
if(strcmp(dev_id,DEVICE_NAME)!=0)
return -1;
wake_up(&adcdev.wait);
}

static ssize_t s3c2410_adc_write(struct file *file, const char *buffer, size_t count, loff_t * ppos)
{
int data;

if(count!=sizeof(data)){
//error input data size
DPRINTK("the size of input data must be %d\n", sizeof(data));
return 0;
}

copy_from_user(&data, buffer, count);
adcdev.channel=ADC_WRITE_GETCH(data);
adcdev.prescale=ADC_WRITE_GETPRE(data);

DPRINTK("set adc channel=%d, prescale=0x%x\n", adcdev.channel, adcdev.prescale);

return count;
}

static ssize_t s3c2410_adc_read(struct file *filp, char *buffer, size_t count, loff_t *ppos)
{
int ret = 0;

if (down_interruptible(&adcdev.lock))
return -ERESTARTSYS;

START_ADC_AIN(adcdev.channel, adcdev.prescale);
interruptible_sleep_on(&adcdev.wait);

ret = ADCDAT0;
ret &= 0x3ff;
DPRINTK("AIN[%d] = 0x%04x, %d\n", adcdev.channel, ret, ADCCON & 0x80 ? 1:0);

copy_to_user(buffer, (char *)&ret, sizeof(ret));

up(&adcdev.lock);

return sizeof(ret);
}

static int s3c2410_adc_open(struct inode *inode, struct file *filp)
{
init_MUTEX(&adcdev.lock);
init_waitqueue_head(&(adcdev.wait));

adcdev.channel=0;
adcdev.prescale=0xff;

MOD_INC_USE_COUNT;
DPRINTK( "adc opened\n");
return 0;
}

static int s3c2410_adc_release(struct inode *inode, struct file *filp)
{
MOD_DEC_USE_COUNT;
DPRINTK( "adc closed\n");
return 0;
}


static struct file_operations s3c2410_fops = {
owner: THIS_MODULE,
open: s3c2410_adc_open,
read: s3c2410_adc_read,
write: s3c2410_adc_write,
release: s3c2410_adc_release,
};

#ifdef CONFIG_DEVFS_FS
static devfs_handle_t devfs_adc_dir, devfs_adcraw;
#endif

int __init s3c2410_adc_init(void)
{
int ret;

/* normal ADC */
ADCTSC = 0; //XP_PST(NOP_MODE);

ret = request_irq(IRQ_ADC_DONE, adcdone_int_handler, SA_SHIRQ, DEVICE_NAME, NULL);
if (ret) {
return ret;
}

ret = register_chrdev(0, DEVICE_NAME, &s3c2410_fops);
if (ret < 0) {
printk(DEVICE_NAME " can't get major number\n");
return ret;
}
adcMajor=ret;

#ifdef CONFIG_DEVFS_FS
devfs_adc_dir = devfs_mk_dir(NULL, "adc", NULL);
devfs_adcraw = devfs_register(devfs_adc_dir, "0raw", DEVFS_FL_DEFAULT,
adcMajor, ADCRAW_MINOR, S_IFCHR | S_IRUSR | S_IWUSR, &s3c2410_fops, NULL);
#endif
printk (DEVICE_NAME"\tinitialized\n");

return 0;
}

module_init(s3c2410_adc_init);

#ifdef MODULE
void __exit s3c2410_adc_exit(void)
{
#ifdef CONFIG_DEVFS_FS
devfs_unregister(devfs_adcraw);
devfs_unregister(devfs_adc_dir);
#endif
unregister_chrdev(adcMajor, DEVICE_NAME);

free_irq(IRQ_ADC_DONE, NULL);
}

module_exit(s3c2410_adc_exit);
MODULE_LICENSE("GPL");
#endif