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authorDarrick J. Wong <djwong@us.ibm.com>2008-05-23 16:04:25 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-24 12:56:08 -0400
commit8808a793f052c0a67426a24b961402fa20e92814 (patch)
tree8ee7a898dee93e95545d4b6f39628e3c52a2e0a1 /Documentation/hwmon
parentb8fdaf5a05adbf80e5a943bb3f65b46b5fb9b488 (diff)
ibmaem: new driver for power/energy/temp meters in IBM System X hardware
This driver reads IBM Active Energy Manager energy/temperature/power sensors on IBM System X hardware. [akpm@linux-foundation.org: fix printk warnings] Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: "Mark M. Hoffman" <mhoffman@lightlink.com> Cc: Corey Minyard <minyard@acm.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1Kernel driver ibmaem
2======================
3
4Supported systems:
5 * Any recent IBM System X server with Active Energy Manager support.
6 This includes the x3350, x3550, x3650, x3655, x3755, x3850 M2,
7 x3950 M2, and certain HS2x/LS2x/QS2x blades. The IPMI host interface
8 driver ("ipmi-si") needs to be loaded for this driver to do anything.
9 Prefix: 'ibmaem'
10 Datasheet: Not available
11
12Author: Darrick J. Wong
13
14Description
15-----------
16
17This driver implements sensor reading support for the energy and power
18meters available on various IBM System X hardware through the BMC. All
19sensor banks will be exported as platform devices; this driver can talk
20to both v1 and v2 interfaces. This driver is completely separate from the
21older ibmpex driver.
22
23The v1 AEM interface has a simple set of features to monitor energy use.
24There is a register that displays an estimate of raw energy consumption
25since the last BMC reset, and a power sensor that returns average power
26use over a configurable interval.
27
28The v2 AEM interface is a bit more sophisticated, being able to present
29a wider range of energy and power use registers, the power cap as
30set by the AEM software, and temperature sensors.
31
32Special Features
33----------------
34
35The "power_cap" value displays the current system power cap, as set by
36the Active Energy Manager software. Setting the power cap from the host
37is not currently supported.