/* Sytem Control */
#define KC_PWR  KC_SYSTEM_POWER
#define KC_SLEP KC_SYSTEM_SLEEP
#define KC_WAKE KC_SYSTEM_WAKE
/* Consumer Page */
#define KC_MUTE KC_AUDIO_MUTE
#define KC_VOLU KC_AUDIO_VOL_UP
#define KC_VOLD KC_AUDIO_VOL_DOWN
#define KC_MNXT KC_MEDIA_NEXT_TRACK
#define KC_MPRV KC_MEDIA_PREV_TRACK
#define KC_MFFD KC_MEDIA_FAST_FORWARD
#define KC_MRWD KC_MEDIA_REWIND
#define KC_MSTP KC_MEDIA_STOP
#define KC_MPLY KC_MEDIA_PLAY_PAUSE
#define KC_EJCT KC_MEDIA_EJECT
#define KC_MSEL KC_MEDIA_SELECT
#define KC_MAIL KC_MAIL
#define KC_CALC KC_CALCULATOR
#define KC_MYCM KC_MY_COMPUTER
#define KC_WSCH KC_WWW_SEARCH
#define KC_WHOM KC_WWW_HOME
#define KC_WBAK KC_WWW_BACK
#define KC_WFWD KC_WWW_FORWARD
#define KC_WSTP KC_WWW_STOP
#define KC_WREF KC_WWW_REFRESH
#define KC_WFAV KC_WWW_FAVORITES

/* keycode to system usage */
#define KEYCODE2SYSTEM(key) \
    (key == KC_SYSTEM_POWER ? SYSTEM_POWER_DOWN : \
    (key == KC_SYSTEM_SLEEP ? SYSTEM_SLEEP : \
    (key == KC_SYSTEM_WAKE  ? SYSTEM_WAKE_UP : 0)))

/* keycode to consumer usage */
#define KEYCODE2CONSUMER(key) \
    (key == KC_AUDIO_MUTE           ?  AUDIO_MUTE : \
    (key == KC_AUDIO_VOL_UP         ?  AUDIO_VOL_UP : \
    (key == KC_AUDIO_VOL_DOWN       ?  AUDIO_VOL_DOWN : \
    (key == KC_MEDIA_NEXT_TRACK     ?  TRANSPORT_NEXT_TRACK : \
    (key == KC_MEDIA_PREV_TRACK     ?  TRANSPORT_PREV_TRACK : \
    (key == KC_MEDIA_FAST_FORWARD   ?  TRANSPORT_FAST_FORWARD : \
    (key == KC_MEDIA_REWIND         ?  TRANSPORT_REWIND : \
    (key == KC_MEDIA_STOP           ?  TRANSPORT_STOP : \
    (key == KC_MEDIA_EJECT          ?  TRANSPORT_STOP_EJECT : \
    (key == KC_MEDIA_PLAY_PAUSE     ?  TRANSPORT_PLAY_PAUSE : \
    (key == KC_MEDIA_SELECT         ?  APPLAUNCH_CC_CONFIG : \
    (key == KC_MAIL                 ?  APPLAUNCH_EMAIL : \
    (key == KC_CALCULATOR           ?  APPLAUNCH_CALCULATOR : \
    (key == KC_MY_COMPUTER          ?  APPLAUNCH_LOCAL_BROWSER : \
    (key == KC_WWW_SEARCH           ?  APPCONTROL_SEARCH : \
    (key == KC_WWW_HOME             ?  APPCONTROL_HOME : \
    (key == KC_WWW_BACK             ?  APPCONTROL_BACK : \
    (key == KC_WWW_FORWARD          ?  APPCONTROL_FORWARD : \
    (key == KC_WWW_STOP             ?  APPCONTROL_STOP : \
    (key == KC_WWW_REFRESH          ?  APPCONTROL_REFRESH : \
    (key == KC_WWW_FAVORITES        ?  APPCONTROL_BOOKMARKS : 0)))))))))))))))))))))

MUTE
VOLU
VOLD
MNXT
MPRV
MFFD
MRWD
MSTP
MPLY
EJCT
MAIL
WSCH
WHOM

static uint16_t usage2bits(uint16_t usage)
{
    switch (usage) {
        case AC_HOME:                 return 0x01;
        case AL_EMAIL:                return 0x02;
        case AC_SEARCH:               return 0x04;
        //case AL_KBD_LAYOUT:         return 0x08;  // Apple virtual keybaord toggle
        case AUDIO_VOL_UP:            return 0x10;
        case AUDIO_VOL_DOWN:          return 0x20;
        case AUDIO_MUTE:              return 0x40;
        case TRANSPORT_PLAY_PAUSE:    return 0x80;
        case TRANSPORT_NEXT_TRACK:    return 0x100;
        case TRANSPORT_PREV_TRACK:    return 0x200;
        case TRANSPORT_STOP:          return 0x400;
        case TRANSPORT_STOP_EJECT:    return 0x800;
        case TRANSPORT_FAST_FORWARD:  return 0x1000;
        case TRANSPORT_REWIND:        return 0x2000;
        //case return 0x4000;   // Stop/eject
        //case return 0x8000;   // Internet browser
    };
    return 0;
}