4. Remote controller tables

Unfortunately, for several years, there was no effort to create uniform IR keycodes for different devices. This caused the same IR keyname to be mapped completely differently on different IR devices. This resulted that the same IR keyname to be mapped completely different on different IR's. Due to that, V4L2 API now specifies a standard for mapping Media keys on IR.

This standard should be used by both V4L/DVB drivers and userspace applications

The modules register the remote as keyboard within the linux input layer. This means that the IR key strokes will look like normal keyboard key strokes (if CONFIG_INPUT_KEYBOARD is enabled). Using the event devices (CONFIG_INPUT_EVDEV) it is possible for applications to access the remote via /dev/input/event devices.

IR default keymapping
Key code Meaning Key examples on IR
Numeric keys
KEY_NUMERIC_0 Keyboard digit 0 0
KEY_NUMERIC_1 Keyboard digit 1 1
KEY_NUMERIC_2 Keyboard digit 2 2
KEY_NUMERIC_3 Keyboard digit 3 3
KEY_NUMERIC_4 Keyboard digit 4 4
KEY_NUMERIC_5 Keyboard digit 5 5
KEY_NUMERIC_6 Keyboard digit 6 6
KEY_NUMERIC_7 Keyboard digit 7 7
KEY_NUMERIC_8 Keyboard digit 8 8
KEY_NUMERIC_9 Keyboard digit 9 9
Movie play control
KEY_FORWARD Instantly advance in time >> / FORWARD
KEY_BACK Instantly go back in time <<< / BACK
KEY_FASTFORWARD Play movie faster 
>>> / FORWARD
KEY_REWIND Play movie back REWIND / BACKWARD
KEY_NEXT Select next chapter / sub-chapter / interval NEXT / SKIP
KEY_PREVIOUS Select previous chapter / sub-chapter / interval << / PREV / PREVIOUS
KEY_AGAIN Repeat the video or a video interval REPEAT / LOOP / RECALL
KEY_PAUSE Pause stream PAUSE / FREEZE
KEY_PLAY Play movie at the normal timeshift NORMAL TIMESHIFT / LIVE / >
KEY_PLAYPAUSE Alternate between play and pause PLAY / PAUSE
KEY_STOP Stop stream STOP
KEY_RECORD Start/stop recording stream CAPTURE / REC / RECORD/PAUSE
KEY_CAMERA Take a picture of the image CAMERA ICON / CAPTURE / SNAPSHOT
KEY_SHUFFLE Enable shuffle mode SHUFFLE
KEY_TIME Activate time shift mode TIME SHIFT
KEY_TITLE Allow changing the chapter CHAPTER
KEY_SUBTITLE Allow changing the subtitle SUBTITLE
Image control
KEY_BRIGHTNESSDOWN Decrease Brightness BRIGHTNESS DECREASE
KEY_BRIGHTNESSUP Increase Brightness BRIGHTNESS INCREASE
KEY_ANGLE Switch video camera angle (on videos with more than one angle stored) ANGLE / SWAP
KEY_EPG Open the Elecrowonic Play Guide (EPG) EPG / GUIDE
KEY_TEXT Activate/change closed caption mode CLOSED CAPTION/TELETEXT / DVD TEXT / TELETEXT / TTX
Audio control
KEY_AUDIO Change audio source AUDIO SOURCE / AUDIO / MUSIC
KEY_MUTE Mute/unmute audio MUTE / DEMUTE / UNMUTE
KEY_VOLUMEDOWN Decrease volume VOLUME- / VOLUME DOWN
KEY_VOLUMEUP Increase volume VOLUME+ / VOLUME UP
KEY_MODE Change sound mode MONO/STEREO
KEY_LANGUAGE Select Language 1ST / 2ND LANGUAGE / DVD LANG / MTS/SAP / MTS SEL
Channel control
KEY_CHANNEL Go to the next favorite channel ALT / CHANNEL / CH SURFING / SURF / FAV
KEY_CHANNELDOWN Decrease channel sequentially CHANNEL - / CHANNEL DOWN / DOWN
KEY_CHANNELUP Increase channel sequentially CHANNEL + / CHANNEL UP / UP
KEY_DIGITS Use more than one digit for channel PLUS / 100/ 1xx / xxx / -/-- / Single Double Triple Digit
KEY_SEARCH Start channel autoscan SCAN / AUTOSCAN
Colored keys
KEY_BLUE IR Blue key BLUE
KEY_GREEN IR Green Key GREEN
KEY_RED IR Red key RED
KEY_YELLOW IR Yellow key YELLOW
Media selection
KEY_CD Change input source to Compact Disc CD
KEY_DVD Change input to DVD DVD / DVD MENU
KEY_EJECTCLOSECD Open/close the CD/DVD player -> ) / CLOSE / OPEN
KEY_MEDIA Turn on/off Media application PC/TV / TURN ON/OFF APP
KEY_PC Selects from TV to PC PC
KEY_RADIO Put into AM/FM radio mode RADIO / TV/FM / TV/RADIO / FM / FM/RADIO
KEY_TV Select tv mode TV / LIVE TV
KEY_TV2 Select Cable mode AIR/CBL
KEY_VCR Select VCR mode VCR MODE / DTR
KEY_VIDEO Alternate between input modes SOURCE / SELECT / DISPLAY / SWITCH INPUTS / VIDEO
Power control
KEY_POWER Turn on/off computer SYSTEM POWER / COMPUTER POWER
KEY_POWER2 Turn on/off application TV ON/OFF / POWER
KEY_SLEEP Activate sleep timer SLEEP / SLEEP TIMER
KEY_SUSPEND Put computer into suspend mode STANDBY / SUSPEND
Window control
KEY_CLEAR Stop stream and return to default input video/audio CLEAR / RESET / BOSS KEY
KEY_CYCLEWINDOWS Minimize windows and move to the next one ALT-TAB / MINIMIZE / DESKTOP
KEY_FAVORITES Open the favorites stream window TV WALL / Favorites
KEY_MENU Call application menu 2ND CONTROLS (USA: MENU) / DVD/MENU / SHOW/HIDE CTRL
KEY_NEW Open/Close Picture in Picture PIP
KEY_OK Send a confirmation code to application OK / ENTER / RETURN
KEY_ASPECT_RATIO Select screen aspect ratio 4:3 16:9 SELECT
KEY_FULL_SCREEN Put device into zoom/full screen mode ZOOM / FULL SCREEN / ZOOM+ / HIDE PANNEL / SWITCH
Navigation keys
KEY_ESC Cancel current operation CANCEL / BACK
KEY_HELP Open a Help window HELP
KEY_HOMEPAGE Navigate to Homepage HOME
KEY_INFO Open On Screen Display DISPLAY INFORMATION / OSD
KEY_WWW Open the default browser WEB
KEY_UP Up key UP
KEY_DOWN Down key DOWN
KEY_LEFT Left key LEFT
KEY_RIGHT Right key RIGHT
Miscellaneous keys
KEY_DOT Return a dot .
KEY_FN Select a function FUNCTION

It should be noted that, sometimes, there some fundamental missing keys at some cheaper IR's. Due to that, it is recommended to:

Notes
On simpler IR's, without separate channel keys, you need to map UP as KEY_CHANNELUP
On simpler IR's, without separate channel keys, you need to map DOWN as KEY_CHANNELDOWN
On simpler IR's, without separate volume keys, you need to map LEFT as KEY_VOLUMEDOWN
On simpler IR's, without separate volume keys, you need to map RIGHT as KEY_VOLUMEUP