Question about module_register_chrdev()

[Tiziano Fagni <tizyfa@tiscalinet.it>]

Hi,
I want to write a new character device. for kernel 2.4.0 In the init_module()
function I must register my new device driver.
The function I use is the module_register_chrdev() that I found documented on
the "Linux kernel module programming guide".
When compile the module I obtain warning messagges that say that I declared
this function implicity. 
What are the include file to use of this function?
I have searched documentation for this function in the Kernel-api document
(contained in the Linux 2.4.0 source) but I don't have found it.
Is there (in kernel 2.4) a new function that do the same thing as
module_register_chdev()?

Anyone can give me some tips?

Thanks 
Tiziano Fagni
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