aboutsummaryrefslogtreecommitdiff
path: root/Documentation
diff options
context:
space:
mode:
authorDarrick J. Wong <djwong@us.ibm.com>2008-05-23 13:04:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-24 09:56:08 -0700
commit8808a793f052c0a67426a24b961402fa20e92814 (patch)
tree8ee7a898dee93e95545d4b6f39628e3c52a2e0a1 /Documentation
parentb8fdaf5a05adbf80e5a943bb3f65b46b5fb9b488 (diff)
downloadlinux-linaro-8808a793f052c0a67426a24b961402fa20e92814.tar.gz
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwmon/ibmaem37
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/hwmon/ibmaem b/Documentation/hwmon/ibmaem
new file mode 100644
index 00000000000..2fefaf582a4
--- /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.