编写设备驱动源程序 c语言代码
时间: 2023-07-30 09:06:10 浏览: 112
以下是一个简单的设备驱动程序的 C 语言代码示例:
```c
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple device driver module");
static int device_open(struct inode *inode, struct file *file)
{
printk(KERN_ALERT "Device opened\n");
return 0;
}
static int device_release(struct inode *inode, struct file *file)
{
printk(KERN_ALERT "Device closed\n");
return 0;
}
static ssize_t device_read(struct file *file, char *buffer, size_t length, loff_t *offset)
{
printk(KERN_ALERT "Read operation not supported\n");
return -EINVAL;
}
static ssize_t device_write(struct file *file, const char *buffer, size_t length, loff_t *offset)
{
printk(KERN_ALERT "Write operation not supported\n");
return -EINVAL;
}
static struct file_operations fops = {
.open = device_open,
.release = device_release,
.read = device_read,
.write = device_write
};
static int __init device_init(void)
{
printk(KERN_ALERT "Device driver module loaded\n");
return register_chrdev(0, "device_driver", &fops);
}
static void __exit device_exit(void)
{
unregister_chrdev(0, "device_driver");
printk(KERN_ALERT "Device driver module unloaded\n");
}
module_init(device_init);
module_exit(device_exit);
```
这个示例驱动程序只是演示了如何实现设备的打开、关闭、读和写操作,并且注册了一个字符设备。当然,实际的设备驱动程序要复杂得多,需要根据具体的设备进行开发。
相关推荐
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)