HID: input: don't register unmapped input devices
There is no need to register an input device containing no events. This allows drivers using the quirk MULTI_INPUT to register one input per report effectively used. For backward compatibility, we need to add a quirk to request this behavior. Signed-off-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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