With newer hardware, the touchpad provides range info.
Let's use it.
Signed-off-by: NJJ Ding <jj_ding@emc.com.tw>
Acked-by: NDaniel Kurtz <djkurtz@chromium.org>
Acked-by: NÉric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>