Commit f62d14a8 authored by Peter Hutterer's avatar Peter Hutterer Committed by Dmitry Torokhov

Input: document INPUT_PROP_TOPBUTTONPAD

Signed-off-by: default avatarPeter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 50c5d36d
...@@ -281,6 +281,19 @@ gestures can normally be extracted from it. ...@@ -281,6 +281,19 @@ gestures can normally be extracted from it.
If INPUT_PROP_SEMI_MT is not set, the device is assumed to be a true MT If INPUT_PROP_SEMI_MT is not set, the device is assumed to be a true MT
device. device.
INPUT_PROP_TOPBUTTONPAD:
-----------------------
Some laptops, most notably the Lenovo *40 series provide a trackstick
device but do not have physical buttons associated with the trackstick
device. Instead, the top area of the touchpad is marked to show
visual/haptic areas for left, middle, right buttons intended to be used
with the trackstick.
If INPUT_PROP_TOPBUTTONPAD is set, userspace should emulate buttons
accordingly. This property does not affect kernel behavior.
The kernel does not provide button emulation for such devices but treats
them as any other INPUT_PROP_BUTTONPAD device.
Guidelines: Guidelines:
========== ==========
The guidelines below ensure proper single-touch and multi-finger functionality. The guidelines below ensure proper single-touch and multi-finger functionality.
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