我现在使用mini2440做AD采样，2.6.29的内核，AD驱动和触摸屏驱动使用的是光盘自带的，现在的问题是如何使得触摸屏和AD采样同时运行？
如果把触摸屏驱动给注释掉的话，AD采样可以正常运行，采样数据正确。
问题是如果我触摸屏驱动加载后，如果不加载外部信号的话，触摸屏可以正常使用（此时AD采样得到的数据不正确，全部为“0”），如果一加上外部信号的话，触摸屏马上死掉，请问该如何解决？
下面是我的AD驱动程序，是依照光盘程序修改的，其中有一部分是定时器的使用，触摸屏的驱动是光盘中的程序，没有修改过，希望各位给予指点！
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <mach/regs-clock.h>
#include <plat/regs-timer.h>
#include <plat/regs-adc.h>
#include <mach/regs-gpio.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>
#include "s3c24xx-adc.h"
#include <linux/timer.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 "adc"
static void __iomem *base_addr;
static void __iomem *timer_addr;
typedef struct {
wait_queue_head_t wait;
struct cdev cdev;
struct semaphore lock;
int channel;
int prescale;
}ADC_DEV;
//struct ADC_DEV adc_dev;
DECLARE_MUTEX(ADC_LOCK);
volatile static int OwnADC = 0;
static int TimeNum = 0;
static ADC_DEV adcdev;
static volatile int ev_adc = 0;
static int adc_data;
#define value_count 1000
static spinlock_t lock;
static struct clk *adc_clock;
#define rTCFG0 (*(volatile unsigned long *)(timer_addr + 0x00))
#define rTCFG1 (*(volatile unsigned long *)(timer_addr + 0x04))
#define rTCON (*(volatile unsigned long *)(timer_addr + 0x08))
#define rTCNTB0 (*(volatile unsigned long *)(timer_addr + 0x0C))
#define rTCMPB0 (*(volatile unsigned long *)(timer_addr + 0x10))
#define rTCNTO0 (*(volatile unsigned long *)(timer_addr + 0x14))
#define ADCCON (*(volatile unsigned long *)(base_addr + S3C2410_ADCCON)) //ADC control
#define ADCTSC (*(volatile unsigned long *)(base_addr + S3C2410_ADCTSC)) //ADC touch screen control
#define ADCDLY (*(volatile unsigned long *)(base_addr + S3C2410_ADCDLY)) //ADC start or Interval Delay
#define ADCDAT0 (*(volatile unsigned long *)(base_addr + S3C2410_ADCDAT0)) //ADC conversion data 0
#define ADCDAT1 (*(volatile unsigned long *)(base_addr + S3C2410_ADCDAT1)) //ADC conversion data 1
#define ADCUPDN (*(volatile unsigned long *)(base_addr + 0x14)) //Stylus Up/Down interrupt status
#define PRESCALE_DIS (0 << 14)
#define PRESCALE_EN (1 << 14)
#define PRSCVL(x) ((x) << 6)
#define ADC_INPUT(x) ((x) << 3)
#define ADC_START (1 << 0)
#define ADC_ENDCVT (1 << 15)
#define START_ADC_AIN(ch, prescale) \
do{ \
ADCCON = PRESCALE_EN | PRSCVL(prescale) | ADC_INPUT((ch)) ; \
ADCCON |= ADC_START; \
}while(0)
static timer0_config()
{
timer_addr = ioremap(S3C2410_PA_TIMER,0x20);
rTCFG0=12;
rTCFG1=1;
rTCNTB0=26406;
rTCMPB0=0;
rTCNTO0=26406;
}
static int timer0_start()
{
rTCON|= 1<<1;
rTCON=0x09;
}
static ssize_t s3c2410_adc_read(struct file *filp, char *buffer, size_t count, loff_t *ppos)
{
int value;
unsigned short ad_buf[value_count];
memset(ad_buf,0,sizeof(unsigned short) * value_count);
timer0_config();
if (down_trylock(&ADC_LOCK) == 0)
{
spin_lock_irq(lock);
int i = 0;
int m = 0;
for (i = 1;i<1000;i++)
{
START_ADC_AIN(0x0000, adcdev.prescale);
wake_up_interruptible(&adcdev.wait);
while(!(ADCCON & 0x8000))
{
;
}
ad_buf[m] = ADCDAT0 & 0x3ff;
wake_up_interruptible(&adcdev.wait);
if(m==0)
{
timer0_start();
}
if(m==998)
{
ad_buf[999] = rTCNTO0 & 0xffff;
rTCON=0x00;
}
m = m+1;
}
up(&ADC_LOCK);
spin_unlock_irq(lock);
}
else
{
value = -1;
}
copy_to_user(buffer,ad_buf, (sizeof(unsigned short))*value_count);
}
static int s3c2410_adc_open(struct inode *inode, struct file *filp)
{
init_waitqueue_head(&(adcdev.wait));
adcdev.channel=0x0000;
adcdev.prescale=0x0031;
DPRINTK( "adc opened\n");
return 0;
}
static int s3c2410_adc_release(struct inode *inode, struct file *filp)
{
DPRINTK( "adc closed\n");
return 0;
}
static struct file_operations dev_fops = {
owner: THIS_MODULE,
open: s3c2410_adc_open,
read: s3c2410_adc_read,
release: s3c2410_adc_release,
};
static struct miscdevice misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &dev_fops,
};
static int __init dev_init(void)
{
int ret;
base_addr=ioremap(S3C2410_PA_ADC,0x20);
if (base_addr == NULL) {
printk(KERN_ERR "Failed to remap register block\n");
return -ENOMEM;
}
adc_clock = clk_get(NULL, "adc");
if (!adc_clock) {
printk(KERN_ERR "failed to get adc clock source\n");
return -ENOENT;
}
clk_enable(adc_clock);
/* normal ADC */
ADCTSC = 0;
ret = misc_register(&misc);
printk (DEVICE_NAME"\tinitialized\n");
return ret;
}
static void __exit dev_exit(void)
{
iounmap(base_addr);
iounmap(timer_addr);
if (adc_clock) {
clk_disable(adc_clock);
clk_put(adc_clock);
adc_clock = NULL;
}
misc_deregister(&misc);
}
EXPORT_SYMBOL(ADC_LOCK);
module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("FriendlyARM Inc.");
