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| author | David Herrmann <dh.herrmann@gmail.com> | 2013-10-09 07:48:33 +0200 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2013-10-16 08:42:07 +0200 |
| commit | 1ccd33b8f69f9df7f11b0ec08259058164831ca5 (patch) | |
| tree | b32eb7c1aebfab8865d93cc0be98c0bce730e9a4 /Documentation/input | |
| parent | Merge tag 'v3.12-rc4' into next (diff) | |
| download | linux-1ccd33b8f69f9df7f11b0ec08259058164831ca5.tar.xz linux-1ccd33b8f69f9df7f11b0ec08259058164831ca5.zip | |
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: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation/input')
| -rw-r--r-- | Documentation/input/gamepad.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/input/gamepad.txt b/Documentation/input/gamepad.txt index 8002c894c6b0..31bb6a4029ef 100644 --- a/Documentation/input/gamepad.txt +++ b/Documentation/input/gamepad.txt @@ -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 |