Hello, > Did you look at the code in drivers/serial/ ? I did have a look into it and got lost. IIRC the drivers i looked into registered themselves with serio subsystem and I thought serio is the serial equivalent of parport, but now it seems I was quite wrong. Thanks for your tip as I am back into it and hope i get it this time. Bye. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/