The USB Serial Driver Layer

http://www.linuxjournal.com/article/6434
http://www.linux.it/~rubini/docs/serial/serial.html
http://www.linuxjournal.com/article/7353
http://www.linuxjournal.com/article/4786
http://www.linuxjournal.com/article/6331
http://www.linuxjournal.com/article/8093
http://www.linuxjournal.com/article/6226
http://www.linuxjournal.com/article/5448