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Some input events users such as Android require BTN_TOUCH events. Implement EV_KEY/BTN_TOUCH and make sure that the release event is not erroneous scheduled without a preceding valid touch. Avoid duplicated BTN_TOUCH events, even though input core filters them. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>