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Synatics touchpads only have 2 slots, but support TRIPLETAP and above. When the third finger touches, the kernel may end the second slot and re-start it with the coordinates of the third touch in the next frame. The event sequence is something like: ABS_MT_SLOT 0 ABS_MT_POSITION_X 4000 ABS_MT_POSITION_Y 4000 ABS_MT_PRESSURE 78 ABS_MT_SLOT 1 ABS_MT_TRACKING_ID -1 ABS_X 4000 ABS_Y 4000 ABS_PRESSURE 78 BTN_TOOL_DOUBLETAP 0 BTN_TOOL_TRIPLETAP 1 --- SYN_REPORT (0) ---------- ABS_MT_SLOT 0 ABS_MT_POSITION_X 4000 ABS_MT_POSITION_Y 4000 ABS_MT_PRESSURE 78 ABS_MT_SLOT 1 ABS_MT_TRACKING_ID 55 ABS_MT_POSITION_X 2000 ABS_MT_POSITION_Y 2000 ABS_MT_PRESSURE 72 ABS_X 4000 ABS_Y 4000 ABS_PRESSURE 78 --- SYN_REPORT (0) ---------- libinput usually ignores any BTN_TOOL_* <= num_slots since we expect that the slot values are valid. Make an exception for the serial synaptics touchpads. If a touch has ended when the fake touch goes above active-slots (but still within num-slots), move that touch back to UPDATE. This ensures the right number of nfingers_down. When the touch restarts again in the next frame, tp_begin_touch() will skip over re-initializing it because it's already in UPDATE anyway. Note that at this point this only handles the transition _to_ TRIPLETAP, not from TRIPLETAP to DOUBLETAP. Need to wait for this to be seen in the wild first. https://bugs.freedesktop.org/show_bug.cgi?id=91352 Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Hallelujah-expressed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> |
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/*!@mainpage libinput ======== libinput is a library that handles input devices for display servers and other applications that need to directly deal with input devices. It provides device detection, device handling, input device event processing and abstraction so minimize the amount of custom input code the user of libinput need to provide the common set of functionality that users expect. Input event processing includes scaling touch coordinates, generating pointer events from touchpads, pointer acceleration, etc. libinput originates from [weston](http://cgit.freedesktop.org/wayland/weston/), the Wayland reference compositor. Architecture ------------ libinput is not used directly by applications, rather it is used by the xf86-input-libinput X.Org driver or wayland compositors. The typical software stack for a system running Wayland is: @dotfile libinput-stack-wayland.gv Where the Wayland compositor may be Weston, mutter, KWin, etc. Note that Wayland encourages the use of toolkits, so the Wayland client (your application) does not usually talk directly to the compositor but rather employs a toolkit (e.g. GTK) to do so. The simplified software stack for a system running X.Org is: @dotfile libinput-stack-xorg.gv Again, on a modern system the application does not usually talk directly to the X server using Xlib but rather employs a toolkit to do so. Source code ----------- The source code of libinput can be found at: http://cgit.freedesktop.org/wayland/libinput For a list of current and past releases visit: http://www.freedesktop.org/wiki/Software/libinput/ Reporting Bugs -------------- Bugs can be filed in the libinput component of Wayland: https://bugs.freedesktop.org/enter_bug.cgi?product=Wayland&component=libinput Where possible, please provide an [evemu](http://www.freedesktop.org/wiki/Evemu/) recording of the input device and/or the event sequence in question. Documentation ------------- Developer API documentation: http://wayland.freedesktop.org/libinput/doc/latest/modules.html High-level documentation about libinput's features: http://wayland.freedesktop.org/libinput/doc/latest/pages.html License ------- libinput is licensed under the MIT license. > Permission is hereby granted, free of charge, to any person obtaining a > copy of this software and associated documentation files (the "Software"), > to deal in the Software without restriction, including without limitation > the rights to use, copy, modify, merge, publish, distribute, sublicense, > and/or sell copies of the Software, and to permit persons to whom the > Software is furnished to do so, subject to the following conditions: [...] See the [COPYING](http://cgit.freedesktop.org/wayland/libinput/tree/COPYING) file for the full license information. */