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Retrieving the supported versions of a command is a fairly common operation. Provide a helper for it. If the command is not supported at all the EC returns -EINVAL/EC_RES_INVALID_PARAMS. This error is translated into an empty version mask as that is easier to handle for callers and they don't need to know about the error details. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://lore.kernel.org/r/20240630-cros_ec-charge-control-v5-3-8f649d018c52@weissschuh.net Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>