刚开始学习驱动,测试的时候发现第一次打开没问题,但第2次打开却没反应了.
大家帮忙看看可能是什么原因
下面是部分代码:

复制代码 static int s3c2410_ts_open(struct inode *inode, struct file *filp) {     TS_DEV *devp;          devp = container_of(inode->i_cdev, TS_DEV, cdev);          filp->private_data = devp;          /* 创建等待队列和环形缓冲区 */          devp->head = devp->tail = 0;     devp->penStatus = PEN_UP;     init_waitqueue_head(&(devp->wq));          /* 注册中断 */          if (request_irq(IRQ_ADC, stylus_action, IRQF_SHARED,    /* 共享中断 */         "s3c2410_action", &(devp->cdev))) {         printk(KERN_ERR "Could not allocate ts IRQ_ADC\n");         return -EIO;     }     if (request_irq(IRQ_TC, stylus_updown, IRQF_SAMPLE_RANDOM,         "s3c241_updown", &(devp->cdev))) {         printk(KERN_ERR "Could not allocate ts IRQ_TC\n");         return -EIO;         }          DPRINTK("ts opened\n");          return 0; } static int s3c2410_ts_release(struct inode *inode, struct file *filp) {     TS_DEV *devp = filp->private_data;          disable_irq(IRQ_ADC);     disable_irq(IRQ_TC);     free_irq(IRQ_TC,&(devp->cdev));     free_irq(IRQ_ADC,&(devp->cdev));          DPRINTK("ts released\n");          return 0; } static int __init s3c2410_ts_init(void) {     int ret;     adc_clock = clk_get(NULL, "adc");     if (!adc_clock) {         printk(KERN_ERR "Faild to get adc clock source\n");         return -ENOENT;     }     clk_enable(adc_clock);          base_addr = ioremap(S3C2410_PA_ADC, 0x20);     if (base_addr == NULL) {         printk(KERN_ERR "Fiald to remap register block\n");         return -ENOMEM;     }          /* Config GPIOs */     s3c2410_ts_connect();          iowrite32(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(0xFF),\              base_addr+S3C2410_ADCCON);     iowrite32(0xffff,  base_addr+S3C2410_ADCDLY);     iowrite32(WAIT4INT(0), base_addr+S3C2410_ADCTSC);          /* Register char device */          if (alloc_chrdev_region(&tsdev_number, 0, 1, DEVICE_NAME) < 0) {         printk(KERN_DEBUG "Can not register device\n");         return -1;     }          tsdev_class = class_create(THIS_MODULE, DEVICE_NAME);          tsdev = kmalloc(sizeof(TS_DEV), GFP_KERNEL);     if (!tsdev) {         printk(KERN_ERR "Bad kmalloc\n");         return -ENOMEM;     }          cdev_init(&tsdev->cdev, &tsdev_fops);     tsdev->cdev.owner = THIS_MODULE;          ret = cdev_add(&tsdev->cdev, tsdev_number, 1);     if (ret) {         printk(KERN_ERR "Bad cdev\n");         return ret;     }          device_create(tsdev_class, NULL, tsdev_number, 0, "my-ts");          DPRINTK("Loading Module my-ts Success..\n");          return 0; } static void __exit s3c2410_ts_exit(void) {     if (adc_clock) {         clk_disable(adc_clock);         clk_put(adc_clock);         adc_clock = 0;     }          /* Unregister devce */          unregister_chrdev_region(tsdev_number, 1);     device_destroy(tsdev_class, tsdev_number);     cdev_del(&tsdev->cdev);     kfree(tsdev);     class_destroy(tsdev_class);          iounmap(base_addr);          DPRINTK("Unloading Module my-ts Success..\n"); }

加打印，看看是是运行到哪了，中断有没有发生。。。。等等

第一次打开没什么问题,是关闭后在打开设备就不行了.

在重新加载模块后第一次打开发现它在打开ADC转换中断后不再相应ADC转换中断
iowrite32(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
iowrite32(ioread32(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START,
             base_addr+S3C2410_ADCCON);
同样第2次打开,触摸屏中断IRQ_TC和ADC中断IRQ_ADC都不响应
只有重启系统后第一次打开没任何问题
打开设备后系统中断如下:
[root@FriendlyARM driver]# cat /proc/interrupts
           CPU0
30:      25085         s3c  S3C2410 Timer Tick
32:          0         s3c  s3c2410-lcd
33:          0         s3c  s3c-mci
37:         21         s3c  s3c-mci
42:          0         s3c  ohci_hcd:usb1
43:          0         s3c  s3c2440-i2c
51:       2637     s3c-ext  eth0
60:          0     s3c-ext  s3c-mci
70:         99   s3c-uart0  s3c2440-uart
71:        214   s3c-uart0  s3c2440-uart
79:          4     s3c-adc  s3c241_updown
80:         68     s3c-adc  adc, s3c2410_action
83:          0           -  s3c2410-wdt
Err:          0

79和80分别是IRQ_TC和IRQ_ADC