akaeled.c

uClinux环境下

#include <linux/config.h>
#include <linux/utsname.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/malloc.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/init.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/system.h>
#include <linux/poll.h>
#include <asm/arch/io.h>
#include <asm/44b.h>
#define rPCONA_LED (rPCONA=rPCONA&~0X300)
#define rPCONB_LED (rPCONB=rPCONB&~0X010)
#define LED_1_OFF (rPDATA=rPDATA|512)
#define LED_1_ON (rPDATA=rPDATA&~512)
#define LED_2_OFF (rPDATA=rPDATA|256)
#define LED_2_ON (rPDATA=rPDATA&~256)
#define LED_3_OFF (rPDATB=rPDATB|16)
#define LED_3_ON (rPDATB=rPDATB&~16)
void long_delay(void)
 {
   int i;
   for(i=0;i<0x7fff0;i++)
      {;}
 }
static int led_open(struct inode *inode,struct file *file)
 {
  int i;
  rPCONA_LED;
  rPCONB_LED;
  printk("led open: the led open now\n");
 for(i=0;i<3;i++)
  {  printk("led open: all leds off\n");
     LED_1_OFF;
     LED_2_OFF;
     LED_3_OFF;
     long_delay();
     printk("led open: all leds on\n");
     LED_1_ON;
     LED_2_ON;
     LED_3_ON;
     long_delay();
   }
 return 0;
  }
static int led_close(struct inode *inode,struct file *file)
{  printk("led close :now the led close\n");
   LED_1_OFF;
   LED_1_ON;
   long_delay();
   LED_2_OFF;
   LED_2_ON;
   long_delay();
   LED_3_OFF;
   LED_3_ON;
   long_delay();
  return 0;
}
static int led_ioctl(struct inode *inode,struct file *file,unsigned int cmd,unsigned long arg)
{
//  led_open();
 switch(cmd)
   {
     case 1:
       { LED_1_ON;
         long_delay();
         LED_2_OFF;
         long_delay();

         LED_3_OFF;
         printk("led1 on\n");
         long_delay();

         long_delay();
         long_delay();
         long_delay();
         break;
        };
 case 2:
       { LED_1_OFF;
         LED_2_ON;
         LED_3_OFF;
         printk("led2 on\n");
         long_delay();
          long_delay();
         long_delay();

         break;
        };
     case 3:
       { LED_1_OFF;
         LED_2_OFF;
         LED_3_ON;
         printk("led3 on\n");
         long_delay();
          long_delay();
         long_delay();

          break;
      };
   }
     return 0;
}

 static int led_read(void)
{
    return 0;
  }
 struct file_operations akaeled_fops =
 {
   open:    led_open,
   ioctl:   led_ioctl,
   release: led_close,
   read:    led_read,
 };
int akaeled_init(void)
 { int result;
   printk("the led register now\n");
  result=register_chrdev(254,"akaeled",&akaeled_fops);
   if(result<0)
     {
        printk("register failure!\n" );
     }
   else
    {
       printk("register OK!\n");

    }
 return 0;
  }