From: kernelnewbies-bounces@kernelnewbies.org [mailto:kernelnewbies-bounces@kernelnewbies.org] On Behalf Of Gabriel Duarte Sent: Thursday, March 29, 2012 4:14 AM To: kernelnewbies@kernelnewbies.org Subject: Translate keysyms to ASCII Hello people, I working on a small proof of concept keylogger that works on kernel mode. It's parte of my studies of kernel development. I'm using the struct "keyboard_notifier_param" to get the keys pressed on the keyboard(s) attached to the system. At the end, I print the value, like this: printk(KERN_DEBUG "KEY== %i", param->value); According to the definition of the struct "keyboard_notifier_param" at http://lxr.free-electrons.com/source/include/linux/keyboard.h#L37, the field value is a "keycode, unicode value or keysym". For example, when I press the key a, I get the value 30, but I would like tranlate it to the ASCII. I managed to create a translation table by myself, but I think there is another way more stylish to do this, or not? I googled a lot but could not find a consistent answer. Any help is appreciated, Gabriel. -- Gabriel Duarte Linux User #471185 France / Grenoble - Rhône Alpes http://genericdev.wordpress.com/ The term I think you want to search for is "PC keyboard scan code". This link seems to cover it pretty well: http://www.quadibloc.com/comp/scan.htm Jeff Haran