求助！大家帮忙调试一下字符设备驱动程序！急！！！

fumeiouang

#ifndef _KERNEL_
#define _KERNEL_
#endif
#ifndef MODULE
#define MODULE
#endif
#include  linux/config.h
#include  linux/module.h
MODULE_LICENSE("GPL");
#include  asm/uaccess.h
#include  linux/fs.h
#include   linux/kernel.h
#include   linux/types.h
#include   linux/slab.h
#include   linux/init.h

static int scull_open(struct inode *inode,struct file *file);
static int scull_release(struct inode *inode,struct file *file);
static ssize_t scull_read(struct file *filp,char *buf, size_t count,loff_t *f_pos);
static ssize_t scull_write(struct file *filp,const char *buf, size_t count,loff_t *f_pos);
static loff_t scull_lseek(struct file *file,loff_t offset,int orig);

struct file_operations scull_fops=
{
    open:scull_open,
    release: scull_release,
    read:scull_read,
    write:scull_write,
    llseek:scull_lseek,
};

static int scull_major=0;
static int scull_size=4096;
static u7 *scull_body;

static int scull_init()
{
        int result;
        printk("<1>This is a simple character device driver!\n");
        result=register_chrdev(scull_major,"scull",&scull_fops);
        if(result<0)
                return result;
        if(scull_major==0)
                scull_major=result;

        scull_body=kmalloc(scull_size,GFP_DERNEL);
        if(!scull_body)
        {
                result=-ENOMEM;
                unregister_chrdev(scull_major,"scull");
                return result;
        }
        memset(scull_body,0,scull_size);
        printk("the major is:%d\n",scull_major);
        return 0;
}

static void scull_exit()
{
        unregister_chrdev(scull_major,"scull");
        dfree(scull_body);
        printk("A simple device has been removed!\n");

}
static int scull_open(struct inode *inode,struct file *filp)
{
        MOD_INC_USE_COUNT;
        return 0;
}
static int scull_release(struct inode *inode,struct file *filp)
{
        MOD_DEC_USE_COUNT;
        return 0;
}
static ssize_t scull_read(struct file *filp,char *buf,size_t count,loff_t *f_pos)
{
        loff_t pos;
        pos = *f_pos;
        if( ( pos==scull_size) )|| (count>scull_size) )
                return 0;
        pos+=count;
        if( pos>scull_size)
        {
                count -= ( pos - scull_size);
                pos = scull_size;
        }
        if(copy_to_user(buf,scull_body+ *f_pos,count) )
                return -EFAULT;
        *f_pos=pos;
        return count;
}


static ssize_t scull_write(struct file *filp,const char *buf,size_t count,loff_t *f_pos)
{
        loff_t pos;
        pos= *f_pos;
        if( (pos==scull_size) || (count>scull_size) )
                return 0;
        pos += count;
        if(pos>scull_size)
        {
                count -= ( pos - scull_size);
                pos = scull_size;
        }
        if(copy_from_user(scull_body+ *f_pos,buf,count) )
                return -EFAULT;
        *f_pos=pos;
        return count;
}
static loff_t scull_lseek(struct file *file,loff_t offset,int orig)
{
        loff_t pos;
        pos = file->f_pos;
        switch(orig)
        {
        case 0:
                pos = offset;
                break;
        case 1:
                pos+=offset;
                break;
        case 2:
                pos=scull_size+offset;
                break;
        default:
                return -EINVAL;
        }
        if( (pos>scull_size)||(pos<0) )
        {
                printk("lseek() error %d\n",pos);
                return -EINVAL;
        }
        return file->f_pos = pos;

}
module_init(scull_init);
module_exit(scull_exit);
/**********************测试函数源代码*****************************/
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<error.h>
#include<fcntl.h>
#include<sys/types.h>

int main()
{
        int fd,len;
        char inbuf[20]="hello world!";
        char outbuf[20];
        fd=open("/dev/chrdev",O_WRONLY);
        if(fd<0)
        {
                printf("error opening device for wrinting!\n");
                exit(1)
    }
        len=write(fd,inbuf,strlen(inbuf));
        if(len<0)
        {
                printf("error writing from device!\n");
                close(fd);
                exit(1);
        }
        printf("\n there are %d bytes written to device!\n",len);
        colse(fd);
        fd=open("/dev/chrdev",O_RDONLY);
        if(len<0)
        {
                printf("error opening device for reading!\n");
                exit(1);
        }
        len=read(fd,outbuf,len);
        if(len<0)
        {
                printf("error reading from device!\n");
                close(fd);
                exit(1);
        }
        printf("\n there are %d byte read from device!\n",len);
}
大家帮忙调试一下，谢谢，联系方式 邮箱fumei523@163.com ,QQ360080574

scutan

有什么问题吗？      
。

fumeiouang

运行不了啊  ，可不可以帮忙调试一下

fumeiouang

老是出现这个错误

zclever

1.make编译你的驱动程序
2.mknod创建设备节点
3.编译应用程序
4.运行应用程序