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Commit 1ccd33b8 authored by David Herrmann's avatar David Herrmann Committed by Dmitry Torokhov
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Input: clarify gamepad API ABS values 



It wasn't really clear from the gamepad-API description how ABS values are
mapped exactly. Clarify that negative is left/up and positive is
right/down. Unfortunately, this means I screwed up the Wii U ProController
ABI. Anyhow, this just means we continue to have 0 compatible gamepad
drivers in the kernel. User-space needs to fix them up, anyway, as all
other gamepads are also incompatible.

Signed-off-by: default avatarDavid Herrmann <dh.herrmann@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent e3c55d40

Documentation/input/gamepad.txt

+3 −0
Original line number Diff line number Diff line
@@ -122,12 +122,14 @@ D-Pad: 
      BTN_DPAD_*

    Analog buttons are reported as:

      ABS_HAT0X and ABS_HAT0Y

      (for ABS values negative is left/up, positive is right/down)



Analog-Sticks:

  The left analog-stick is reported as ABS_X, ABS_Y. The right analog stick is

  reported as ABS_RX, ABS_RY. Zero, one or two sticks may be present.

  If analog-sticks provide digital buttons, they are mapped accordingly as

  BTN_THUMBL (first/left) and BTN_THUMBR (second/right).

    (for ABS values negative is left/up, positive is right/down)



Triggers:

  Trigger buttons can be available as digital or analog buttons or both. User-
@@ -138,6 +140,7 @@ Triggers: 
  ABS_HAT2X (right/ZR) and BTN_TL2 or ABS_HAT2Y (left/ZL).

  If only one trigger-button combination is present (upper+lower), they are

  reported as "right" triggers (BTN_TR/ABS_HAT1X).

    (ABS trigger values start at 0, pressure is reported as positive values)



Menu-Pad:

  Menu buttons are always digital and are mapped according to their location