debugfs-olpc

 1What:		/sys/kernel/debug/olpc-ec/cmd
 2Date:		Dec 2011
 3KernelVersion:	3.4
 4Contact:	devel@lists.laptop.org
 5Description:
 6
 7A generic interface for executing OLPC Embedded Controller commands and
 8reading their responses.
 9
10To execute a command, write data with the format: CC:N A A A A
11CC is the (hex) command, N is the count of expected reply bytes, and A A A A
12are optional (hex) arguments.
13
14To read the response (if any), read from the generic node after executing
15a command. Hex reply bytes will be returned, *whether or not* they came from
16the immediately previous command.