How do I make a simple hello world module in Linux?

[rm-rf]

I have been wanting to work on developing Linux, and one of the problems I have is that most of the documentation out there for developing Linux modules is outdated (or atleast all the documentation I have found). I read in a book called "Linux device drivers" that it got all of its information about kernel development from the documentation that comes with the kernel source code.
However I haven't been able to find the documentation on how to write a simple module. I am using Linux version 2.6.32-32-generic.

[lucasct]

Here is a example code

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/syscalls.h>

// ****************************************************************************
// Inicializacion del modulo
//   Funcion de registracion para el evento
// ****************************************************************************
static int __init hello(void)
{
	printk(KERN_EMERG "Hello!!.\n");
  return 0;
}

// ****************************************************************************
// Desinicializacion del modulo
//   Funcion para desregistracion del el evento
// ****************************************************************************
static void __exit bye(void)
{
	printk(KERN_EMERG "Bye!!.\n");
}

module_init(hello);
module_exit(bye);
MODULE_DESCRIPTION("Hello");
MODULE_AUTHOR("Me");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.00");

And a makefile

# Makefile for the hello
# Modify the path to the kernel sources

ifneq ($(KERNELRELEASE),)

obj-m := drvhello.o

else
# Path to the kernel sources
# Adapt the path to your system setup
KDIR :=$(HOME)/dev/linux-2.6.27.5

# Current directory
PWD  := $(shell pwd)

all:
	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

endif

then run make.

then insmod drvhello.ko