23d543b711
During libinput initialization a list of existing input devices is retrieved from udev. This can lead to a situation where libinput can end up processing un-configured devices because of the race generated by udev events and libinput startup. Sequence example: weston - start udev - device 1 added weston - get a list of input devices weston - process device 1 -- undefined behavior udev - device 1 added - finalized The problem was found because of incorrect touchscreen association when in a dual monitor system the secondary touchscreen was incorrectly associated with output one since udev didn't finish the device initialization and WL_OUTPUT was missing. To avoid this situation we skip un-configured devices during libinput initialization, relying on udev to send events when devices are fully configured. Note: due to the peculiarities of udev_device_get_is_initialized(), the input device is still processed if the call fails. If there are no udev rules defined for the device, it will never be reported as initialized, but this is not a problem, because all input devices handled by libinput must have some udev properties set, therefore they always have rules. Signed-off-by: Nandor Han <nandor.han@ge.com> [Pekka: change log to debug, unref device] Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> |
||
|---|---|---|
| doc | ||
| include/linux | ||
| src | ||
| test | ||
| tools | ||
| udev | ||
| .dir-locals.el | ||
| .gitignore | ||
| .vimdir | ||
| circle.yml | ||
| CODING_STYLE | ||
| COPYING | ||
| meson.build | ||
| meson_options.txt | ||
| README.md | ||
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, 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/
Build instructions: http://wayland.freedesktop.org/libinput/doc/latest/building_libinput.html
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 the libinput record output
of the input device and/or the event sequence in question.
See @ref reporting_bugs for more info.
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
- Build instructions: http://wayland.freedesktop.org/libinput/doc/latest/building_libinput.html
- Documentation for previous versions of libinput: https://wayland.freedesktop.org/libinput/doc/
Examples of how to use libinput are the debugging tools in the libinput repository. Developers are encouraged to look at those tools for a real-world (yet simple) example on how to use libinput.
- A commandline debugging tool: https://cgit.freedesktop.org/wayland/libinput/tree/tools/libinput-debug-events.c
- A GTK application that draws cursor/touch/tablet positions: https://cgit.freedesktop.org/wayland/libinput/tree/tools/libinput-debug-gui.c
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 file for the full license information.