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

Documentation/input/event-codes.txt

+13 −0
Original line number Diff line number Diff line
@@ -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

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:

==========

The guidelines below ensure proper single-touch and multi-finger functionality.