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static void module3_exit(void){
cdev_del(mydev);
printk(KERN_INFO"Device"DEV_NAME"was deleted");
};
int mydev_open(struct inode *in,struct file *filp){
printk(KERN_INFO DEV_NAME "open");
struct dev_state *dev_stat;
dev_stat=&STATE[MINOR(in->i_rdev)];
if(dev_stat->dev_open)
{
printk("Kernel: device "DEV_NAME" is exist");
return -EBUSY;
};
dev_stat->dev_open++;
dev_stat->dev_read=0;
dev_stat->dev_write=0;
int num= NUM(in->i_rdev);
int type=TYPE(in->i_rdev);
return 0;
};
int mydev_ioctl(struct inode *in,struct file *filp,unsigned int ioctl,unsigned long param)
{
printk(KERN_INFO DEV_NAME "ioctl");
return 0;
};
ssize_t mydev_read(struct file *filp,char *buff,ssize_t len,loff_t pos)
{
printk(KERN_INFO DEV_NAME "read");
struct inode *in;
int count=len;
struct dev_state *devst;
printk("Kernel: try to read %d bytes \n",len);
in=filp->f_dentry->d_inode;
printk("Kernel: minor number is %d",MINOR(in->i_rdev));
devst=&STATE[MINOR(in->i_rdev)];
while(count--)
{
put_user(inb_p(PORT_START+10*MINOR(in->i_rdev)),buff);
buff++;
};
devst->dev_read+=len;
printk(KERN_INFO"Kernel: read "DEV_NAME" %d bytes",len);
return len;
};
ssize_t mydev_write(struct file *filp, const char *buff, ssize_t len,loff_t pos)
{
printk(KERN_INFO DEV_NAME "write");
struct inode *in;
int count=len;
unsigned char byte;
struct dev_state *devst;
printk(KERN_INFO"Kernel: try to write %d bytes\n",len);
in=filp->f_dentry->d_inode;
printk(KERN_INFO"Kernel: minor number %d\n",MINOR(in->i_rdev));
devst=&STATE[MINOR(in->i_rdev)];
while(count--)
{
get_user(byte, buff);
outb_p(byte, PORT_START+10*MINOR(in->i_rdev));
buff++;
};
devst->dev_write +=len;
printk(KERN_INFO"Kernel: "DEV_NAME " written %d bytes\n",len);
return len;
};
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