linux驱动添加cdev

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/cdev.h>
#include <linux/fs.h>

static struct cdev my_cdev;
static dev_t dev_num;

static int my_open(struct inode *inode, struct file *file) {
    printk(KERN_INFO "Device opened\n");
    return 0;
}

static int my_release(struct inode *inode, struct file *file) {
    printk(KERN_INFO "Device released\n");
    return 0;
}

static struct file_operations fops = {
    .open = my_open,
    .release = my_release,
};

static int __init my_init(void) {
    alloc_chrdev_region(&dev_num, 0, 1, "my_device");
    cdev_init(&my_cdev, &fops);
    my_cdev.owner = THIS_MODULE;
    cdev_add(&my_cdev, dev_num, 1);
    printk(KERN_INFO "Device registered\n");
    return 0;
}

static void __exit my_exit(void) {
    cdev_del(&my_cdev);
    unregister_chrdev_region(dev_num, 1);
    printk(KERN_INFO "Device unregistered\n");
}

module_init(my_init);
module_exit(my_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple character device driver");