#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/timer.h>#include <linux/sched.h>#include <linux/tty.h>#include <linux/module.h>#include <linux/init.h>#include <linux/miscdevice.h>#include <linux/delay.h>#include <linux/types.h>#include <linux/miscdevice.h>#include <linux/ioport.h>#include <linux/mc146818rtc.h>#include <linux/poll.h>#include <linux/proc_fs.h>#include <linux/spinlock.h>#include <linux/sysctl.h>#include <linux/pci.h>#include <asm/mach/irq.h>#include <asm/hardware.h>#include <asm/io.h>#include <asm/irq.h>#include <asm/system.h>#include <asm/uaccess.h>#include <asm/arch/io.h>#include "44b.h"
#define DEVICE_NAME	"rtctime"typedef struct {	int  year;	int  month;	int  day;	int  weekday;	int  hour;	int  min;	int  sec;}RTCSTATE;static RTCSTATE _time;void Display_RTC(void);
void Set_year(int);void Set_mon(int);void Set_day(int);void Set_weekday(int);void Set_hour(int);void Set_min(int);
void Display_RTC(void)	//顯示當前時間(只需從寄存器中讀取數值即可)
{
    rRTCCON = 0x01;
 
    _time.year = rBCDYEAR;
    _time.month=rBCDMON;
    _time.day=rBCDDAY;
    _time.weekday=rBCDDATE;
    _time.hour=rBCDHOUR;
    _time.min=rBCDMIN;
    _time.sec=rBCDSEC;
    if(_time.sec==0)	//秒數到零時,重新讀一下其它寄存器,為了防止一秒誤差
    {	_time.year = rBCDYEAR;
    	_time.month=rBCDMON;
    	_time.day=rBCDDAY;
    	_time.weekday=rBCDDATE;
    	_time.hour=rBCDHOUR;
    	_time.min=rBCDMIN;    }

    //printk("\n%4d-%02x-%02x-%x-%02x:%02x:%02x\n",_time.year+2000,_time.month,_time.day,_time.weekday,_time.hour,_time.min,_time.sec);	 
    rRTCCON = 0x0;    
}void Set_year(int year)	//設置年
{
    rRTCCON = 0x01;
     rBCDYEAR = ((year/10)<<4) + (year%10);
    rRTCCON = 0x0;    
}void Set_mon(int mon)	//設置月
{
    rRTCCON = 0x01;
     rBCDMON = ((mon/10)<<4) + (mon%10);
    rRTCCON = 0x0;    
}void Set_day(int day)	//設置日
{
    rRTCCON = 0x01;
     rBCDDAY = ((day/10)<<4) + (day%10);
    rRTCCON = 0x0;    
}void Set_weekday(int weekday)	//設置星期
{
    rRTCCON = 0x01;
     rBCDDATE = ((weekday/10)<<4) + (weekday%10);
    rRTCCON = 0x0;    
}void Set_hour(int hour)	//設置小時
{
    rRTCCON = 0x01;
     rBCDHOUR = ((hour/10)<<4) + (hour%10);
    rRTCCON = 0x0;    
}void Set_min(int min)	//設置分鐘
{
    rRTCCON = 0x01;
 
    rBCDMIN = ((min/10)<<4) + (min%10);
    rRTCCON = 0x0;    
}static int rtctime_open(struct inode *inode, struct file *filp){	return 0;}static int rtctime_release(struct inode *inode, struct file *filp){  	return 0;}static int rtctime_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg){	switch(cmd) 	{		case 0:			Display_RTC();			return 0;		case 1:			Set_year(arg);			return 0;		case 2:			Set_mon(arg);			return 0;		case 3:			Set_day(arg);			return 0;		case 4:			Set_weekday(arg);			return 0;		case 5:			Set_hour(arg);			return 0;		case 6:			Set_min(arg);			return 0;        	default:                        printk("ERROR\n");    	}    	return 0;}static int rtctime_read(struct file *fp, char *buf, size_t count)
{    put_user(_time.year, buf);	//將寄存器數值存入緩沖區,以便上層read函數調用    put_user(_time.month, buf+4);    put_user(_time.day, buf+8);    put_user(_time.weekday, buf+12);    put_user(_time.hour, buf+16);    put_user(_time.min, buf+20);    put_user(_time.sec, buf+24);    return count;
}static struct file_operations rtctime_fops = {  	open:	rtctime_open,	ioctl:	rtctime_ioctl,  	release:	rtctime_release,	read:	rtctime_read,};int rtctime_init(void){	int ret;	ret = register_chrdev(254, DEVICE_NAME, &rtctime_fops);	if (ret < 0) {		printk(DEVICE_NAME " can't get major number\n");		return ret;	}	else 		printk("OK\n");		return 0;}