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+What: /sys/kernel/debug/olpc-ec/cmd
+Date: Dec 2011
+KernelVersion: 3.4
+A generic interface for executing OLPC Embedded Controller commands and
+reading their responses.
+To execute a command, write data with the format: CC:N A A A A
+CC is the (hex) command, N is the count of expected reply bytes, and A A A A
+are optional (hex) arguments.
+To read the response (if any), read from the generic node after executing
+a command. Hex reply bytes will be returned, *whether or not* they came from
+the immediately previous command.