[완료] char device driver 올리는데 잘 안되네요...

캐릭터 디바이스를 올리려고 하는데 잘 안되네요

제가 생각하기에 insmod를 하면 /dev/밑에 원하는 게 생길거라고 생각했는데 생기지 않습니다.
mkmod로 올리고도 해보았는데, 안되는군요.. 뭐가 문제인지..

아래 테스트로 사용한 코드를 보내드립니다.

#include
#include
#include
#include
#include
#include

//MODULE_LICENSE("GPL");
//MODULE_AUTHOR("Peter Jay Salzman");

#define DEVICE_NAME "bit"
#define SUCCESS 0

static int device_open(struct inode *, struct file *);
static int device_release(struct inode *, struct file *);
static ssize_t device_read(struct file *, char *, size_t, loff_t *);
static ssize_t device_write(struct file *, const char *, size_t, loff_t *);

static dev_t dev;
static int Major;

static struct file_operations fops = {
.read = device_read,
.write = device_write,
.open = device_open,
.release = device_release
};

static int __init initBIT(void)
{
dev = MKDEV(251,0);

printk(KERN_INFO "BIT TEST START\n");
printk(KERN_INFO "Major : %d Minor : %d \n", MAJOR(dev), MINOR(dev));

register_chrdev_region(dev, 1, DEVICE_NAME);

//Major = register_chrdev(0, DEVICE_NAME, &fops);

return 0;

}

static void __exit exitBIT(void)
{
//unregister_chrdev(Major, DEVICE_NAME);
unregister_chrdev_region(dev, 1);
printk(KERN_INFO "BIT TEST STOP\n");
}

static int device_open(struct inode *inode, struct file *file)
{
printk(KERN_INFO "OPEN DEVICE \n");
try_module_get(THIS_MODULE);
return SUCCESS;
}

static int device_release(struct inode *inode, struct file *file)
{
return SUCCESS;
}
static ssize_t device_read(struct file *flip,
char *buffer,
size_t length,
loff_t *offset)
{
int bytes_read = 0;
printk(KERN_INFO "READ DEVICE \n");

return bytes_read;
}
static ssize_t device_write(struct file *flip,
const char *buffer,
size_t length,
loff_t *offset)
{
printk(KERN_INFO "WRITE DEVICE \n");
return -EINVAL;
}

module_init(initBIT);
module_exit(exitBIT);