key code value definitions

include/uapi/linux/input-event-codes.h
188#define KEY_MUTE 113
189#define KEY_VOLUMEDOWN 114
190#define KEY_VOLUMEUP 115
191#define KEY_POWER 116 /* SC System Power Down */
192#define KEY_KPEQUAL 117
193#define KEY_KPPLUSMINUS 118
194#define KEY_PAUSE 119
195#define KEY_SCALE 120 /* AL Compiz Scale (Expose) */