Linux Device Drivers Development

Driver skeletons

Let's consider the following helloworld module. It will be the basis for our work during the rest of this chapter.

The helloworld.c file is as follows:

#include <linux/init.h> 
#include <linux/module.h> 
#include <linux/kernel.h> 
 
static int __init helloworld_init(void) { 
    pr_info("Hello world!\n"); 
    return 0; 
} 
 
static void __exit helloworld_exit(void) { 
    pr_info("End of the world\n"); 
} 
 
module_init(helloworld_init); 
module_exit(helloworld_exit); 
MODULE_AUTHOR("John Madieu <[e-mail]>"); 
MODULE_LICENSE("GPL");