嵌入式linux驱动培训

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

static int __init hello_init(void) {
    printk(KERN_INFO "Hello, World!\n");
    return 0;
}

static void __exit hello_exit(void) {
    printk(KERN_INFO "Goodbye, World!\n");
}

module_init(hello_init);
module_exit(hello_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple Hello World Module");
MODULE_VERSION("0.1");

static int my_device_open(struct inode *inode, struct file *file) {
    // 打开设备时的操作
    return 0;
}

static int my_device_release(struct inode *inode, struct file *file) {
    // 关闭设备时的操作
    return 0;
}

static ssize_t my_device_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) {
    // 读取设备数据的操作
    return count;
}

static ssize_t my_device_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) {
    // 写入设备数据的操作
    return count;
}

static struct file_operations my_device_fops = {
    .owner = THIS_MODULE,
    .open = my_device_open,
    .release = my_device_release,
    .read = my_device_read,
    .write = my_device_write,
};

static int __init my_device_init(void) {
    // 注册设备驱动
    return register_chrdev(MAJOR_NUM, DEVICE_NAME, &my_device_fops);
}

static void __exit my_device_exit(void) {
    // 注销设备驱动
    unregister_chrdev(MAJOR_NUM, DEVICE_NAME);
}

module_init(my_device_init);
module_exit(my_device_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple device driver");
MODULE_VERSION("0.1");