Re: [PATCH] Input: clarify gamepad API ABS values
From: Antonio Ospite <hidden>
Date: 2013-11-14 17:13:03
On Thu, 3 Oct 2013 15:27:09 +0200 David Herrmann [off-list ref] wrote:
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.
I was just going to ask that, thanks. Has this patch picked up?
... 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.
I know it is not really relevant and you won't fix the kernel interface anyway, but I was just curios: is there any known userspace using the gamepad API? Another question is below.
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Signed-off-by: David Herrmann <redacted> --- Documentation/input/gamepad.txt | 3 +++ 1 file changed, 3 insertions(+)diff --git a/Documentation/input/gamepad.txt b/Documentation/input/gamepad.txt index 8002c89..31bb6a4 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)
Does that mean that analog D-Pad Left and D-Pad Right are supposed to be described as a single axis (ABS_HAT0X), even if in the input report they come as two different fields (non adjacent even)? And same for analog Up/Down? JFYI on the PS3 controller it is possible to have values from analog D-Pad Left and analog D-Pad Right at the same time, even if it is mechanically unlikely.
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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)
What about analog Action-Pad buttons? Do you suggest any mapping for them?
Menu-Pad: Menu buttons are always digital and are mapped according to their location
Thanks, Antonio -- Antonio Ospite http://ao2.it A: Because it messes up the order in which people normally read text. See http://en.wikipedia.org/wiki/Posting_style Q: Why is top-posting such a bad thing?