Write Hello World Linux Driver Code

 

Here is an example of a basic "Hello, World!" Linux device driver:

#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("John Doe");
MODULE_DESCRIPTION("A basic Hello World Linux device driver");

This code defines a simple Linux kernel module with two functions: hello_init and hello_exit. The hello_init function is called when the module is loaded into the kernel and it uses the printk function to print "Hello, World!" to the kernel log. The hello_exit function is called when the module is removed from the kernel and it uses the printk function to print "Goodbye, World!" to the kernel log.

The module_init and module_exit macros are used to specify the initialization and cleanup functions for the module.

The MODULE_LICENSE, MODULE_AUTHOR, MODULE_DESCRIPTION are used to provide information about the module and the license under which it is distributed.

It is important to note that this is just a basic example of a Linux device driver and writing device drivers for Linux kernel is a complex task and requires a deep understanding of the Linux kernel and device driver programming. This example does not show how to interact with a specific hardware device and it's not a complete and functional driver.