嵌入式linux驱动移植

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

#define DEVICE_NAME "my_device"
#define CLASS_NAME "my_class"

static int major_number;

static struct class* my_class;
static struct device* my_device;

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

static struct file_operations fops = {
   .open = device_open,
};

static int __init driver_init(void) {
    major_number = register_chrdev(0, DEVICE_NAME, &fops);
    my_class = class_create(THIS_MODULE, CLASS_NAME);
    my_device = device_create(my_class, NULL, MKDEV(major_number, 0), NULL, DEVICE_NAME);
    printk(KERN_INFO "Driver loaded with major number %d
", major_number);
    return 0;
}

static void __exit driver_exit(void) {
    device_destroy(my_class, MKDEV(major_number, 0));
    class_unregister(my_class);
    class_destroy(my_class);
    unregister_chrdev(major_number, DEVICE_NAME);
    printk(KERN_INFO "Driver unloaded
");
}

module_init(driver_init);
module_exit(driver_exit);

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