Input: ads7846 - debouncing and rudimentary sample filtering
Some touchscreens seem to oscillate heavily for a while after touching the screen. Implement support for sampling the screen until we get two consecutive values that are close enough. Signed-off-by: NImre Deak <imre.deak@nokia.com> Signed-off-by: NJuha Yrjola <juha.yrjola@nokia.com> Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net> Signed-off-by: NDmitry Torokhov <dtor@mail.ru>
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