From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764267AbYEIRgo (ORCPT ); Fri, 9 May 2008 13:36:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752262AbYEIRgg (ORCPT ); Fri, 9 May 2008 13:36:36 -0400 Received: from e32.co.us.ibm.com ([32.97.110.150]:48559 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752097AbYEIRgf (ORCPT ); Fri, 9 May 2008 13:36:35 -0400 Date: Fri, 9 May 2008 10:36:47 -0700 From: "Darrick J. Wong" To: "Mark M. Hoffman" Cc: Andrew Morton , linux-kernel , lm-sensors Subject: [PATCH] ibmaem: Overview of the driver Message-ID: <20080509173647.GK16404@tree.beaverton.ibm.com> Reply-To: djwong@us.ibm.com MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A brief overview of what this driver does Signed-off-by: Darrick J. Wong --- Documentation/hwmon/ibmaem | 37 +++++++++++++++++++++++++++++++++++++ 1 files changed, 37 insertions(+), 0 deletions(-) diff --git a/Documentation/hwmon/ibmaem b/Documentation/hwmon/ibmaem new file mode 100644 index 0000000..2fefaf5 --- /dev/null +++ b/Documentation/hwmon/ibmaem @@ -0,0 +1,37 @@ +Kernel driver ibmaem +====================== + +Supported systems: + * Any recent IBM System X server with Active Energy Manager support. + This includes the x3350, x3550, x3650, x3655, x3755, x3850 M2, + x3950 M2, and certain HS2x/LS2x/QS2x blades. The IPMI host interface + driver ("ipmi-si") needs to be loaded for this driver to do anything. + Prefix: 'ibmaem' + Datasheet: Not available + +Author: Darrick J. Wong + +Description +----------- + +This driver implements sensor reading support for the energy and power +meters available on various IBM System X hardware through the BMC. All +sensor banks will be exported as platform devices; this driver can talk +to both v1 and v2 interfaces. This driver is completely separate from the +older ibmpex driver. + +The v1 AEM interface has a simple set of features to monitor energy use. +There is a register that displays an estimate of raw energy consumption +since the last BMC reset, and a power sensor that returns average power +use over a configurable interval. + +The v2 AEM interface is a bit more sophisticated, being able to present +a wider range of energy and power use registers, the power cap as +set by the AEM software, and temperature sensors. + +Special Features +---------------- + +The "power_cap" value displays the current system power cap, as set by +the Active Energy Manager software. Setting the power cap from the host +is not currently supported.