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linux-imx/Documentation/ABI/testing/debugfs-olpc
Daniel Drake a3c8121b87 x86/olpc: Add debugfs interface for EC commands 
Add a debugfs interface for sending commands to the OLPC
Embedded Controller (EC) and reading the responses.  The EC
provides functionality for machine identification, battery and
AC control, wakeup control, etc.

Having a debugfs interface available is useful for EC
development and debugging.

Based on code by Paul Fox (who also approves of the end result).

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Paul Fox <pgf@laptop.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andres Salomon <dilinger@queued.net>
Link: http://lkml.kernel.org/r/20120327150740.667D09D401E@zog.reactivated.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-03-27 20:54:52 +02:00

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What: /sys/kernel/debug/olpc-ec/cmd Date: Dec 2011 KernelVersion: 3.4 Contact: devel@lists.laptop.org Description:

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.