From f62d14a8072b9756db36ba394e2b267470a40240 Mon Sep 17 00:00:00 2001 From: Peter Hutterer Date: Mon, 21 Jul 2014 17:51:35 -0700 Subject: [PATCH] Input: document INPUT_PROP_TOPBUTTONPAD Signed-off-by: Peter Hutterer Signed-off-by: Dmitry Torokhov --- Documentation/input/event-codes.txt | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/Documentation/input/event-codes.txt b/Documentation/input/event-codes.txt index f1ea2c69648d..c587a966413e 100644 --- a/Documentation/input/event-codes.txt +++ b/Documentation/input/event-codes.txt @@ -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. -- 2.34.1