button.c

按键驱动实验 基于TEB-44B0实验平台的按键驱动 包括按键驱动程序与测试程序

/*******************************************************************
 *    Hardware platform: Dragonball EZ ADS                                    *
 *  First version                                                             *
 *  (c) 2001 by Martin Kirsch                                                 *
 *  modified by: [e-mail]    & [e-mail]       *
 *  The file is freely redistributable but not forcommercial use.                    *
 *  Modifued by Vencent for TEB-44B0 board                                                                         *
 *******************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/interrupt.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/segment.h>
//#include <asm/MC68VZ328.h> 
#include <asm/arch/s3c44b0x.h>

int button_major=50; 
#define IRQ_BUTTON	S3C44B0X_INTERRUPT_EINT4567  // 21   
DECLARE_WAIT_QUEUE_HEAD (wq);
static char message;

                               
static void button_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
        
	// ISR |= (1<<18);
	
	//outl(inl(S3C44B0X_EXTINPND)|(0x04), S3C44B0X_EXTINPND);    // Vencent 0831am
	//outl((0x01)<<21, S3C44B0X_I_ISPC);                          // Vencent 0831am
	
	//disable_irq(IRQ_BUTTON);
        message='A';
	printk("##########\n");
        wake_up_interruptible(&wq);
	
	outl(inl(S3C44B0X_EXTINPND)|(0x08), S3C44B0X_EXTINPND);    // Vencent 0831pm
	outl((0x01)<<21, S3C44B0X_I_ISPC);                          // Vencent 0831pm
	 return;
}

                              
/*static int button_read(struct inode *inode, struct file *file, char *buffer, int size)
{*/
static ssize_t button_read (struct file *file, char *buff, size_t len, loff_t *offset)
{    
   
   interruptible_sleep_on(&wq);
   copy_to_user(buff,&message,1);
   //enable_irq(IRQ_BUTTON);        //0831 Vencent
   return 1;
}

static int button_open(struct inode *inode, struct file *file)
{   
   int rc;
   
   rc=request_irq(IRQ_BUTTON, button_interrupt, 0, "button", NULL/*Userdata!!!*/);
   if(rc)
   {
     printk("BUTTON-Driver: Error while installing IRQ_BUTTON handler\n");
     return -ENODEV;
   }
   else
    {
     // printk("the BUTTON is registered successfully!\n");
     // printk("rc=%d \n",rc);
     }
     
   outl(inl(S3C44B0X_PCONG)|((0x03)<<14), S3C44B0X_PCONG); 
   outl(inl(S3C44B0X_PUPG)&(~((0x01)<<7)), S3C44B0X_PUPG); 
   outl(inl(S3C44B0X_INTMOD)&(~((0x01)<<21)), S3C44B0X_INTMOD);
   outl(inl(S3C44B0X_EXTINT)&(~((0x7)<<28)), S3C44B0X_EXTINT);
   //outl(inl(S3C44B0X_EXTINT)|(0x04<<28), S3C44B0X_EXTINT);  
   outl(inl(S3C44B0X_EXTINT)|(0x02<<28), S3C44B0X_EXTINT); 
    
   outl(inl(S3C44B0X_PCONE)&(0x3cfff), S3C44B0X_PCONE); 
   outl(inl(S3C44B0X_PCONE)|(0x1000), S3C44B0X_PCONE);    //PE6 as output
  
   outl(inl(S3C44B0X_PUPE)&(0x1bf), S3C44B0X_PUPE);
  
   outl(inl(S3C44B0X_PDATE)&(0x1bf), S3C44B0X_PDATE);      //PE6->0
  
  
   outl(inl(S3C44B0X_PCONF)&(~((0x03)<<4)), S3C44B0X_PCONF); 
   outl(inl(S3C44B0X_PCONF)|((0x01)<<4), S3C44B0X_PCONF);    //PF2 as output
  
   outl(inl(S3C44B0X_PUPF)&(0x1fb), S3C44B0X_PUPF);
  
   outl(inl(S3C44B0X_PDATF)|(0x04), S3C44B0X_PDATF);      //PF2->1
   
   return 0;
}

struct file_operations button_fops=
{
 read: button_read,
 open: button_open,
};

                               
int insert_button(void)
{
 int rc;

   rc=register_chrdev(button_major, "button", &button_fops);
   if(rc<0)
   {
     printk("Panic! Could not register BUTTON-Driver\n");
     return rc;
   }
   printk("the BUTTON is registered successfully!\n");
   
   //rc=request_irq(IRQ_BUTTON, button_interrupt, 0, "BUTTON-IRQ", NULL/*Userdata!!!*/);
/*   rc=request_irq(IRQ_BUTTON, button_interrupt, 0, "button", NULL);
   if(rc)
   {
     printk("BUTTON-Driver: Error while installing IRQ_BUTTON handler\n");
     return -ENODEV;
   }
   else
    {
      printk("the BUTTON is registered successfully!\n");
      printk("rc=%d \n",rc);
     }
*/   
	//ICR = 0x0f00; //set(i)
	//PDDIR = 0x00;
	//PDSEL = 0x00;
	//PDKBEN = 0x00;
	
/*  outl(inl(S3C44B0X_PCONG)|((0x03)<<12), S3C44B0X_PCONG); 
  outl(inl(S3C44B0X_PUPG)&(~((0x01)<<6)), S3C44B0X_PUPG); 
  outl(inl(S3C44B0X_INTMOD)&(~((0x01)<<21)), S3C44B0X_INTMOD);
  outl(inl(S3C44B0X_EXTINT)&(~((0x7)<<24)), S3C44B0X_EXTINT);
  outl(inl(S3C44B0X_EXTINT)|(0x04<<24), S3C44B0X_EXTINT);
  //enable_irq(IRQ_BUTTON);
 */ 
  return 0;
}

int button_init(void)
{
 int rc;

/*  outl(inl(S3C44B0X_PCONE)&(0x3cffc), S3C44B0X_PCONE); 
  outl(inl(S3C44B0X_PCONE)|(0x3003), S3C44B0X_PCONE);    //PE6,PE0 as output
  
  outl(inl(S3C44B0X_PUPE)&(0xbe), S3C44B0X_PUPE);
  
  outl(inl(S3C44B0X_PDATE)&(0xbe), S3C44B0X_PDATE);      //PE6->0
  outl(inl(S3C44B0X_PDATE)|(0x01), S3C44B0X_PDATE);      //PE0->1
*/
   rc=insert_button();
   if(rc)
   printk("Panic! BUTTON-driver could not be loaded!\n");
   return rc;
}