4412 linux内核移植

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

static int major_number;

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

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

static ssize_t device_read(struct file *file, char __user *buffer, size_t length, loff_t *offset) {
    printk(KERN_INFO "Reading from device\n");
    return 0;
}

static ssize_t device_write(struct file *file, const char __user *buffer, size_t length, loff_t *offset) {
    printk(KERN_INFO "Writing to device\n");
    return length;
}

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

static int __init mydriver_init(void) {
    major_number = register_chrdev(0, "mydevice", &fops);
    if (major_number < 0) {
        printk(KERN_ALERT "Failed to register device\n");
        return major_number;
    }
    printk(KERN_INFO "Device registered with major number %d\n", major_number);
    return 0;
}

static void __exit mydriver_exit(void) {
    unregister_chrdev(major_number, "mydevice");
    printk(KERN_INFO "Device unregistered\n");
}

module_init(mydriver_init);
module_exit(mydriver_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple example Linux module.");