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authorDaniel Drake <dsd@laptop.org>2012-03-27 16:07:40 +0100
committerIngo Molnar <mingo@kernel.org>2012-03-27 20:54:52 +0200
commita3c8121b8724c3d496dc00201ab40e8313edcf0d (patch)
tree4e6974368cd9f09a7a881c0f3ece3ccf7b8f5451 /Documentation
parent90e240142bd31ff10aeda5a280a53153f4eff004 (diff)
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op-kernel-dev-a3c8121b8724c3d496dc00201ab40e8313edcf0d.tar.gz
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>
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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.
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