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Exporting the function allows us to calculate the resolution in third party drivers like hid-multitouch. This patch also complete the function with additional valid axes. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com> Acked-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>