linux 内核 添加驱动

sudo insmod mydriver.ko

sudo mknod /dev/mydevice c major_number minor_number

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

static int major_number;
static struct cdev my_cdev;

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) {
    major_number = register_chrdev(0, "mydriver", &fops);
    if (major_number < 0) {
        printk(KERN_ERR "Failed to register device\n");
        return major_number;
    }
    cdev_init(&my_cdev, &fops);
    my_cdev.owner = THIS_MODULE;
    cdev_add(&my_cdev, MKDEV(major_number, 0), 1);
    printk(KERN_INFO "Driver registered with major number %d\n", major_number);
    return 0;
}

static void __exit my_exit(void) {
    unregister_chrdev(major_number, "mydriver");
    cdev_del(&my_cdev);
    printk(KERN_INFO "Driver unregistered\n");
}

module_init(my_init);
module_exit(my_exit);

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

obj-m += mydriver.o

all:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

make
sudo insmod mydriver.ko