/**
??*?A?demo?driver?for?simple?Character?device.“
??*
??*?simple_chrdev.c?
??*
??*?Author?Tianze?Sun
??*?
??*?E-mail?stz@cic.tsinghua.edu.cn
??*
??*?Fri?Jun?2th?20:32:43?GMT?2006
??*
??*?Current?version:?1.1.0
??*
??*?All?rights?reserved.?Licensed?under?dual?BSD/GPL?license.
??*/

#include??
#include??
#include??
#include??
#include??
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
?
#include?
#include?
#include?

#define?SIMPLE_PHYS_ADDR	0x1FFFFF7C		//Address
#define?SIZE_OF_SIMPLE	2	?????????		//2?Bytes
#define?SIMPLE_TIMER_DELAY?	1			//?1?ms	

#define?SIMPLE_IOCTL_MAGIC??????????‘K‘			//Magic
#define?CMD1	_IOW（SIMPLE_IOCTL_MAGIC3unsigned?long）
#define?CMD2	_IOW（SIMPLE_IOCTL_MAGIC4unsigned?long）
#define?CMDn	_IOW（SIMPLE_IOCTL_MAGIC5unsigned?long）
#define?SIMPLE_NAME?“Simple“?

int?SIMPLE_MAJOR?=?0;
int?SIMPLE_MINOR?=?0;?
int?SIMPLE_NUMBER?=?1;
void?__iomem?*simple_addr_virt?=?NULL;
struct?cdev?*simple_cdev;?
dev_t??simple_dev;?

int?simple_open（struct?inode?*inode?struct?file?*filp）;?
int?simple_release（struct?inode?*inode?struct?file?*filp）;?
int?simple_ioctl?（struct?inode?*inode?struct?file?*file?unsigned?int?cmd?unsigned?long?arg）;?
static?ssize_t?simple_read（struct?file?*?file?char?__user?*buf?size_t?count?loff_t?*ppos）;
static?ssize_t?simple_write（struct?file?*file?const?char?__user?*buf?size_t?len?loff_t?*ppos）;
loff_t?simple_llseek（struct?file?*fileloff_t?offset?int?origin）;

static?struct?timer_list?simple_timer;
static?void?simple_timer_handler（unsigned?long?data）;

extern?struct?file_operations?simple_fops;?
struct?file_operations?simple_fops?=?
{?
	.owner	?=?THIS_MODULE?
	.llseek	?=?simple_llseek?
	.open?	?=?simple_open?
	.read	?=?simple_read
	.write	?=?simple_write
	.ioctl	?=?simple_ioctl
	.release?=?simple_release?
};?

/*?Open?*/?
int?simple_open（struct?inode?*inode?struct?file?*filp）?
{?
	printk（“Simple?Device?is?opened\n“）;?
	try_module_get（THIS_MODULE）?;?
	return?0?;?
}?

/*?Release?*/?
int?simple_release（struct?inode?*inode?struct?file?*filp）?
{?
	printk（“Simple?Device?is?released!\n“）;
	module_put（THIS_MODULE）?;?
	return?0?;?
}?

static?ssize_t?simple_read（struct?file?*filechar?__user?*bufsize_t?countloff_t?*ppos）
{
	int?rv	=?0;					/*?Return?Value?*/
	if?（count?<=?0）						
		return?count;
	printk（“Reading?Data?now...\n“）;
	if?（file->f_flags?&?O_NONBLOCK）?{?			
		rv?=?-EAGAIN;
		return?rv;
	}	
	//Get?data?from?Kernel?space.
	return?rv;
}

/*?Write?*/
static?ssize_t?simple_write（struct?file?*fileconst?char?__user?*bufsize_t?lenloff_t?*ppos）
{
	int?rv?=?0;
	printk（“Writing?Data?now...\n“）;
	//Get?data?from?User?space.
	return?rv;
}

/*?Llseek?*/
loff_t?simple_llseek（struct?file?*file?loff_t?offset?int?origin）
{
	long?long?retval?=?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????764??2006-08-27?22:19??Chapter07\Makefile

?????文件????????660??2006-08-27?22:19??Chapter07\Makefile.x86

?????文件???????5899??2006-08-27?22:22??Chapter07\simple_chrdev.final.c

?????目錄??????????0??2009-03-07?14:28??Chapter07

-----------?---------??----------?-----??----

?????????????????7323????????????????????4