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Most systems don't have a lightbar. Those that do need a way to detect that one exists. That's easily done by just sending a EC_CMD_LIGHTBAR_CMD command to the EC and checking the result. If the response is EC_RES_INVALID_COMMAND, there isn't a lightbar. But what .cmd value should we use in struct ec_params_lightbar? Future lightbar implementations (if any), could remove existing functions or add new ones, so there isn't a safe choice. This change adds a LIGHTBAR_CMD_VERSION operation to determine if any new implementation exists. Future systems should return some useful information in response to this command. Existing systems will return EC_RES_INVALID_PARAM, which is enough to distinguish them. BUG=chromium:239205 BRANCH=none TEST=manual make BOARD=link make BOARD=link runtests There are no user-visible changes in functionality to anything. Change-Id: Ibe37f74a4dcbf68dd6bfd1963530aec907e67534 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/167549 Reviewed-by: Randall Spangler <rspangler@chromium.org>