key.c

uclinux底下的按键驱动 本人已经调试通过

/*****************************Copyright (c)**************************
**                               FREE
**
**--------------File Info-----------------------------------------
** File Name: test.c
** Last modified Date:  2006-9-9
** Last Version: 1.0
** Descriptions: User Configurable File
**
**------------------------------------------------------------------------------------------------------
** Created By: ZLG CHENMINGJI
** Created date:   2006-9-9
** Version: 1.0
** Descriptions: First version
**
**------------------------------------------------------------------------------------------------------
** Modified by:MAMAJINCO
** Modified date:2006-9-9
** Version:1.0
** Descriptions:在此忠心感谢ZLG的模版 我的高质量编程意识起源于此
**
********************************************************************************************************/
#ifndef __KERNEL__
  #define __KERNEL__
#endif 
#ifndef MODULE
 #define MODULE
#endif

#include "key.h"


/********************************************************************************************************
              function announce
********************************************************************************************************/
//以下是关键函数的声明
static int key_open(struct inode *inode, struct file *filp); 
//打开设备时用的 linux把设备当作文件管理 设备最好在用的时候再打开 尽量不要提前
static int key_release(struct inode *inode, struct file *filp); 
static int key_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
		              unsigned long param); 
//控制函数 这里用于控制LED亮与灭
static int __init key_init(void);//注册时用的 注意 模块注册的越早越好
static void __exit key_cleanup(void);//卸载时用的


/*********************************************************************************************************
**                  "全局和静态变量在这里定义"         
**        global variables and static variables define here
********************************************************************************************************/
//static int major = LED_MAJOR_NR;

/********************************************************************************************************/

static struct file_operations key_fops =        /* driver info  */
{
    owner:      THIS_MODULE,

    ioctl:      key_ioctl,
    open:     key_open, 
    release:    key_release,
};

                
/*********************************************************************************************************
** Function name: led_open
** Descriptions:  open device
** Input:inode:   information of device
**       filp:    pointer of file
** Output 0:      OK
**        other:  not OK
** Created by:    Chenmingji
** Created Date:  2006-9-9
**-------------------------------------------------------------------------------------------------------
** Modified by:mamajinco
** Modified Date: 2006-9-9
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
        static int key_open(struct inode *inode, struct file *filp)
{
	//初始化放在OPEN里
	   
	outw(inw(S3C44B0X_PCONG)&0x00ff,S3C44B0X_PCONG); //GP4-GP7设置为输入
	outb(inb(S3C44B0X_PUPG)&0x0f,S3C44B0X_PUPG);     //高四为口上拉
     
    	MOD_INC_USE_COUNT;
    	return 0;          /* success */
} 

/*********************************************************************************************************
** Function name: led_release
** Descriptions:  release device
** Input:inode:   information of device
**       filp:    pointer of file
** Output 0:      OK
**        other:  not OK
** Created by:    Chenmingji
** Created Date:  2006-9-9
**-------------------------------------------------------------------------------------------------------
** Modified by:	mamajinco
** Modified Date: 2006-9-9
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
        static int key_release(struct inode *inode, struct file *filp) 
{
    MOD_DEC_USE_COUNT;
    return(0); 
} 

/*********************************************************************************************************
** Function name: led_ioctl
** Descriptions:  IO control function
** Input:inode:   information of device
**       filp:    pointer of file
**       cmd:     command
**       arg:     additive parameter
** Output 0:      OK
**        other:  not OK
** Created by:    Chenmingji
** Created Date:  2006-9-9
**-------------------------------------------------------------------------------------------------------
** Modified by:	mamajinco
** Modified Date: 2006-9-9
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
        static int key_ioctl(struct inode *inode, struct file *filp, 
                       unsigned int cmd, unsigned long arg)
{
    unsigned char temp;
    switch(cmd)
    {
        case 0:
        	    temp=inb(S3C44B0X_PDATG);    //读出io端口的数据
        	    put_user((temp&0xf0)>>4,(unsigned char*)arg);
            	break;

        //case 1:
		          
            //	break;

        default:
		
		         return -1;
		         break;
    }
    return 0;
}

/*********************************************************************************************************
** Function name: led_init
** Descriptions:  init driver
** Input:none
** Output 0:      OK
**        other:  not OK
** Created by:    Chenmingji
** Created Date:  2006-9-9
**-------------------------------------------------------------------------------------------------------
** Modified by:	mamajinco
** Modified Date: 2006-9-9
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
 static int __init key_init(void)
{
    int  result;

    result = register_chrdev(232,"key",&key_fops); 
/*关键语句 用于注册 
	注意！这是传统的注册方法 在2.4以上的linux版本中 加入了devfs设备文件系统 使注册更容易 但为了与大部分资料相同 大家看的方便  这里仍然使用老方法*/
    if (result < 0)
    {
        printk(KERN_ERR DEVICE_NAME ": Unable to get major %d\n", KEY_MAJOR_NR ); //printk用于向内核输出信息
        return(result); 
    } 


    printk(KERN_INFO DEVICE_NAME ": init OK\n"); 
	
	return(0);
}

/*********************************************************************************************************
** Function name: led_cleanup
** Descriptions:  exit driver
** Input:none
** Output none
** Created by:    Chenmingji
** Created Date:  2006-9-9
**-------------------------------------------------------------------------------------------------------
** Modified by:	mamajinco
** Modified Date: 2006-9-9
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
       static void __exit key_cleanup(void)
{
    unregister_chrdev(232, "key"); //与register_chrdev配对使用
    printk(KERN_INFO DEVICE_NAME ": exit OK\n"); 
}

module_init(key_init);
module_exit(key_cleanup);



/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/