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authorDavid Herrmann <dh.herrmann@gmail.com>2013-10-09 09:48:33 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2013-10-16 10:42:07 +0400
commit1ccd33b8f69f9df7f11b0ec08259058164831ca5 (patch)
treeb32eb7c1aebfab8865d93cc0be98c0bce730e9a4 /Documentation/input
parente3c55d406bd8df1a878546002c93db90c42be10c (diff)
downloadlinux-1ccd33b8f69f9df7f11b0ec08259058164831ca5.tar.xz
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.txt3
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