Missing Key-codes from input.h file.

Hi, I'm working on a module which is an input device and hence it needs to report certain key events. While browsing through the <linux/input.h>, I did find most of the key-codes(which I need to use)already defined but not all. Few of the KEY_xxx which i could not find are: a.) A Key for going to the previous channel. b.) Keys for Moving upper-right, lower-right, upper-left and lower-left direction(probably a GUI(grid of icons),where you move diagonally) d.) A key for Subpicture (this 'subpicture' key is defined in CEA-931C). Does anybody have any idea about this? - Dharam