中断wait_event_interruptible(wq, flag != 0)问题

lisayh

我写了个简单的中断程序：



#define IRQ_ADC_FIQ  AT91_PIN_PB29



#define ADS_CHANNEL_COUNT 4
#define NAME   "gpiotest"
#define TS_PB29  1<<29




static struct cdev ads7852_cdev;
static int major=0;




static DECLARE_WAIT_QUEUE_HEAD(wq);
static struct semaphore sem;
static int flag = 0;



void pio_init(void)
{
  ((AT91PS_SYS)AT91C_VA_BASE_SYS)->PIOB_IER=TS_PB29;
  ((AT91PS_SYS)AT91C_VA_BASE_SYS)->PIOB_PER=TS_PB29;
   ((AT91PS_SYS)AT91C_VA_BASE_SYS)->PIOB_ODR=TS_PB29;
   ((AT91PS_SYS)AT91C_VA_BASE_SYS)->PIOB_PPUER=TS_PB29;
  
}



/******************************************************************************/
static irqreturn_t ads7852_int_handler(int irq, void *dev_id, struct pt_regs *reg)
{

printk(KERN_ERR"AD_DATA ch0: %x\n",data);
flag = 1;
wake_up_interruptible(&wq);



printk("Interrupted: The %u channel data: %u\n", cur_ch, data);



return IRQ_HANDLED;
}



/******************************************************************************/
static ssize_t ads7852_read(struct file *file,char *buf,
       size_t count, loff_t *ppos)
{




  //进入临界区
if(down_interruptible(&sem)) return -ERESTARTSYS;



//让读进程先睡觉,一直到中断发生时中断来唤醒它
printk( "process %i (%s) going to sleep\n",
  current->pid, current->comm);
wait_event_interruptible(wq, flag != 0);
flag = 0;
printk("awoken %i (%s)\n", current->pid, current->comm);
   
up(&sem);


}



/******************************************************************************/
static ssize_t ads7852_open(struct inode *inode, struct file *file)
{
int retval= request_irq( IRQ_ADC_FIQ, ads7852_int_handler,
  SA_INTERRUPT, NAME, NULL );



if(retval==0)
  printk(KERN_WARNING"request_irq result success\n");



else {
  if(retval==-EBUSY)
   printk(KERN_WARNING"request_irq result BUSY\n");
  else
   printk(KERN_WARNING"request_irq result BUSYING\n");



  return -EFAULT;
}
printk(KERN_WARNING"init interrupte\n");
}



/******************************************************************************/
static ssize_t ads7852_release(struct inode *inode, struct file *flip)
{
free_irq(IRQ_ADC_FIQ,NULL);
return 0;
}



/******************************************************************************/
struct file_operations ads7852_fops=
{
.owner = THIS_MODULE,
.read = ads7852_read,
.open = ads7852_open,
.release = ads7852_release
};



/******************************************************************************/
static int __init ads7852_init(void)
{
int retval = 0;
dev_t dev_id;
pio_init();
at91_set_deglitch(AT91_PIN_PB29,1);
set_irq_type(AT91_PIN_PB29,IRQT_RISING);
if(major) {
  //注册主设备号
  dev_id = MKDEV(major,0);
  retval = register_chrdev_region( dev_id, ADS_CHANNEL_COUNT, NAME);
  if(retval < 0) printk(KERN_WARNING"can't register major number\n");
} else {
  //分配主设备号
  retval = alloc_chrdev_region(&dev_id, 0 ,ADS_CHANNEL_COUNT, NAME);
  if (retval <0 )printk(KERN_WARNING"can't alloc major number\n");



  m
}



printk(KERN_WARNING"major=%d\n", major);



//向内核注册设备
cdev_init(&ads7852_cdev, &ads7852_fops);
ads7852_cdev.owner = THIS_MODULE;
ads7852_cdev.ops = &ads7852_fops;
if( cdev_add(&ads7852_cdev, dev_id, ADS_CHANNEL_COUNT) ) {
  printk(KERN_WARNING"cdev_add error!\n");
}



//初始化互斥锁
init_MUTEX(&sem);



printk(KERN_WARNING"module load sucess\n");



return 0;
}



/******************************************************************************/
static void __exit ads7852_exit(void)
{
dev_t dev_id = MKDEV(major,0);
cdev_del(&ads7852_cdev);
unregister_chrdev_region(dev_id,ADS_CHANNEL_COUNT);



}



/******************************************************************************/
module_init(ads7852_init);
module_exit(ads7852_exit);



但是我发现程序运行到：



request_irq     result success
init interrupte
process 828 (testgpio) going to sleep



然后程序就死在这里了，说明根本就没有唤醒中断服务程序，我仔细检查了所写的程序，没有发现什么问题，各位能给指导下吗？为什么中断服务程序就是唤醒不了

hijohnny

这个是个什么中断？IO类型中断？level sensitive or edge ?
我也想知道怎么回事

lisayh

原帖由 hijohnny 于 2007-12-20 18:32 发表
这个是个什么中断？IO类型中断？level sensitive or edge ?
我也想知道怎么回事

这个是IO类型中断

hijohnny

你只注册了中断，未操作产生中断的reg

lisayh

我现在能够产生中断了，但是只产生一次中断后就死在睡眠函数那里了