Documentation/ABI/testing/debugfs-olpc

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