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/* https://cirosantilli.com/linux-kernel-module-cheat#character-devices */

#include <linux/fs.h> /* register_chrdev, unregister_chrdev */

#include <linux/module.h>

#include <linux/seq_file.h> /* seq_read, seq_lseek, single_release */

#define NAME "lkmc_character_device"

static int major;

static int show(struct seq_file *m, void *v)

{

seq_printf(m, "abcd");

return 0;

}

static int open(struct inode *inode, struct file *file)

{

return single_open(file, show, NULL);

}

static const struct file_operations fops = {

.llseek = seq_lseek,

.open = open,

.owner = THIS_MODULE,

.read = seq_read,

.release = single_release,

};

static int myinit(void)

{

major = register_chrdev(0, NAME, &fops);

return 0;

}

static void myexit(void)

{

unregister_chrdev(major, NAME);

}

module_init(myinit)

module_exit(myexit)

MODULE_LICENSE("GPL");