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Currently, it is assumed the host will sooner or later retrieve the events from the sensor ring: It is only used by Android and the sensor HAL is enabling the ring buffer at boot. But if nobody processes the ring, and the ring is almost full, the EC will generate interrupt for every new events. This can happen with ARC, where events generated for ChromeOS will be in the ring but nobody will process them until Android is started. Add a command to allow sending ring MKBP events. It will be used when the IIO ring buffer is enabled / disabled. It also can be used for preventing raising interrupt when the device is about to go to sleep. BRANCH=ryu,cyan BUG=b:25425420,b:27849483 TEST=Check with fiforead that no events are queued when IIO ring buffer is disabled. Check with ectool and androsensor that interrupt generation stops. Change-Id: Ibc85eed2e0eae3a9ec07d191e692118bc2fd0dab Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/356689