目录
一．配置环境并创建文件执行make
二．加载驱动
三．验证驱动
- 配置环境并创建文件
1.准备开发环境，确保Ubuntu虚拟机已经安装了开发工具和内核头文件
sudo apt update
sudo apt install build-essential linux-headers-$(uname -r)
2.在Ubuntu终端中进入root
sudo -i
创建目录
mkdir mine
创建文件Makefile，并写入内容
nano Makefile
创建.c文件并写入驱动代码
nano hello2.c //这里的文件名要和Makefile中的一样，就是第一行的obj-m += hello2.o
代码为：
// hello.c
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple character device driver");
#define HELLO_SIZE 256
static char hello_buffer[HELLO_SIZE];
static int hello_open(struct inode *inode, struct file *filp);
static ssize_t hello_read(struct file *filp, char *buf, size_t count, loff_t *f_pos);
static ssize_t hello_write(struct file *filp, const char *buf, size_t count, loff_t *f_pos);
static int hello_release(struct inode *inode, struct file *filp);
static struct file_operations hello_fops = {
.open = hello_open,
.read = hello_read,
.write = hello_write,
.release = hello_release,
};
static int hello_major = 0;
static int __init hello_init(void) {
int result;
result = register_chrdev(hello_major, "hello", &hello_fops);
if (result < 0) {
printk(KERN_ALERT "hello: cannot obtain major number %d
", hello_major);
return result;
}
if (hello_major == 0) {
hello_major = result;
}
printk(KERN_INFO "Hello, character device driver loaded
");
return 0;
}
static void __exit hello_exit(void) {
unregister_chrdev(hello_major, "hello");
printk(KERN_INFO "Goodbye, character device driver unloaded
");
}
static int hello_open(struct inode *inode, struct file *filp) {
// Open logic, if needed
return 0;
}
static ssize_t hello_read(struct file *filp, char *buf, size_t count, loff_t *f_pos) {
// Read logic, if needed
return 0;
}
static ssize_t hello_write(struct file *filp, const char *buf, size_t count, loff_t *f_pos) {
ssize_t retval = 0;
if (copy_from_user(hello_buffer, buf, count)) {
return -EFAULT;
}
// Write logic here using data in hello_buffer
return retval;
}
static int hello_release(struct inode *inode, struct file *filp) {
// Release logic, if needed
return 0;
}
module_init(hello_init);
module_exit(hello_exit);
显示样式为：
二．将两个文件放入创建好的mine目录中
cp Makefile mine
cp hello2.c mine
执行make
make
执行结果如上图，可以用ls 查看是否成功生成.ko文件
四．加载驱动模块
sudo insmod hello2.ko
检查驱动是否加载成功
dmesg
出现即为成功
五．输入内容
echo "Hello, World" > /dev/hello
确保在字符设备驱动中正确实现了写入操作。
再读取字符设备中的内容并输出到终端
cat /dev/hello2
成功！