hello.c

我自己写的2.4版本下的驱动程序

#ifndef __KERNEL__
   #define __KERNEL__
#endif

#ifndef MODULE
   #define MODULE
#endif

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/compatmac.h>
#include <linux/hdreg.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/wrapper.h>
#include <linux/miscdevice.h>
#include <asm/io.h>
//#include <asm/system.h>
#include <asm/dma.h>
#include <asm/arch/gpio.h>
#include "type.h"
#include "mx2.h"

#define open_hello  1
#define open_hello2  2


static int gMajor;

static int hello_open(struct inode *inode, struct file *filp);
static int hello_release(struct inode *inode, struct file *filp);
static ssize_t hello_read(struct file *filp, char *buf, size_t count, loff_t *f_pos);
static ssize_t hello_write(struct file *filp, const char *buf, size_t count, loff_t *f_pos);
static int hello_ioctl(struct inode * inode,
		struct file *filp,
		unsigned int cmd ,
		unsigned long arg);


static void Delay(int time);

struct file_operations hello_fops = 
{
	open: 	hello_open,
	release:	hello_release,
	read:	hello_read,
	write:	hello_write,
	ioctl:	hello_ioctl,
};

static void Delay(int time)
{
	while(time--);
	return;
}

void show_hello(void)
{
	printk("hello my driver\n");
}

static int hello_open(struct inode *inode, struct file *filp)
{
	MOD_INC_USE_COUNT;
	printk("hello opening\n");
    return 1;
}


static ssize_t  hello_read(struct file *filp, char *buf, size_t count, loff_t *f_pos)
{

	
	return 1;
}


static ssize_t hello_write(struct file *filp, const char *buf, size_t count, loff_t *f_pos)
{
	
	return 1;
}

static int hello_ioctl(struct inode * inode,
		struct file *filp,
		unsigned int cmd ,
		unsigned long arg)
{
	switch(cmd)
	{
	case open_hello:
		show_hello();
		break;
	case open_hello2:
		break;
	}
	return 0;
}

static int hello_release(struct inode *inode, struct file *filp)
{
	MOD_DEC_USE_COUNT;
	
	return 0;
}



static devfs_handle_t devfs_handle;
int init_module()
{
	int result;
	printk("hello driver version 1.0  "__DATE__" / "__TIME__"\n");

	result = devfs_register_chrdev(0, "hello", &hello_fops);
	if ( result < 0 )
	{
		printk("hello error: Unable to register driver\n");		
		return -ENODEV;
	}
	devfs_handle =devfs_register(NULL, "hello", DEVFS_FL_DEFAULT,
			      result, 0,
			      S_IFCHR | S_IRUSR | S_IWUSR,
			      &hello_fops, NULL);


	gMajor = result;
	
	
	return 0;
}

void cleanup_module()
{
	if(gMajor>0)
	{
		devfs_unregister_chrdev(gMajor,"hello");
		devfs_unregister(devfs_handle);
	}

}