This patch adds support for the ET&T TC4UM 4-wire USB touchscreen
controller and tries to reuse the bits for TC5UH controller in kernel
already. Data interface is same.
Tested-by: NRoger Pueyo Centelles <rogerpueyo@rogerpueyo.com>
Signed-off-by: NPetr Štetiar <ynezz@true.cz>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>