Linux 内核模块开发入门：字符设备驱动

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

static int major;
static struct cdev my_cdev;

static ssize_t my_read(struct file *f, char __user *buf, size_t len, loff_t *off) {
    return 0;
}

static struct file_operations my_fops = {
    .owner = THIS_MODULE,
    .read = my_read,
};

static int __init my_init(void) {
    alloc_chrdev_region(&dev, 0, 1, "mydev");
    cdev_init(&my_cdev, &my_fops);
    cdev_add(&my_cdev, dev, 1);
    return 0;
}

module_init(my_init);
MODULE_LICENSE("GPL");