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tslib is an abstraction layer for touchscreen events, as well as a filter stack for the manipulation of those events.
All real work is done is plugins (modules) listed in ts.conf. There are "hardware access plugins" (module_raw) for a wide range of (old) touch screen devices. For touchscreen device drivers using the input event system, there is the module_raw input. Below that you may list any number of "filter plugins" that will be applied in order, for example module dejitter or module median.
Here's a short introductory presentation:
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