错误的led驱动

用户空间函数：

   int main(int argc,char** argv)

   {

          int fd;

          int val;

         fd=open("/dev/led",O_RDWR);

        if(fd<0)

             printf("can not open!\n");

         while(1)

       {

               printf("please input contro bit,1:led light ,0:led close\n\r");

               scanf("%d",&val);

               write(fd,val,sizeof(val));

      }

      return 0;

  }

内核空间：

 #include<linux/module.h>
   #include<linux/kernel.h>
   #include<linux/fs.h>
   #include<linux/init.h>
   #include<linux/delay.h>
   #include<linux/uaccess.h>
   #include<asm/irq.h>
   #include<asm/io.h>
  #include<asm/arch/regs-gpio.h>
  #include<asm/hardware.h>
  #include<linux/device.h>
 static struct class* led_class;
 static struct class_device* led_dev_class;
 volatile unsigned long* gpfcon=NULL;
 volatile unsigned long* gpfdat=NULL;
  int major;
  static int led_open(struct inode* inode,struct file* file)
  {
              printk("led_open ");
             *gpfcon &=~((0x3<<8)|(0x3<<10)|(0x3<<12));
              *gpfcon |=((0x1<<8)|(0x1<<10)|(0x1<<12));
              return 0;
  }
  static ssize_t led_write(struct file* file,const char __user* buf ,size_t count,loff_t* ppos)
  {
            int val;
             printk("first_drv_write\n");
             copy_from_user(&val,buf,count);
              if(val==1)
             {
                 *gpfdat &=~((1<<4)|(1<<5)|(1<<6));
             }
             else
             {
                  *gpfdat |=((1<<4) | (1<<5) |(1<<6));
              }
             return 0;
  }
 static struct file_operations first_drv_fops=
  {
            .owner=THIS_MODULE,
            .open=led_open,
             .write=led_write,
  };
  static int led_enter(void)
  {
          printk("enter driver....\n\r");
          major=register_chrdev(0,"led_register",&first_drv_fops);
          led_class=class_create(THIS_MODULE,"led_class");
           led_dev_class=class_device_create(led_class,NULL,MKDEV(major,0),NULL,"led");
           gpfcon=(volatile unsigned long*)ioremap(0x56000050,16);
           gpfdat=gpfcon+1;
            return 0;
  }
 static void led_leave(void)
  {
            printk("ledave driver....\n\r");
           unregister_chrdev(major,"led_register");
          class_device_unregister(led_dev_class);
          class_destroy(led_class);
          iounmap(gpfcon);
  }
  module_init(led_enter);
  module_exit(led_leave);
 MODULE_LICENSE("GPL");