linux/Documentation/hwmon/ibmaem
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   1Kernel driver ibmaem
   2======================
   3
   4This driver talks to the IBM Systems Director Active Energy Manager, known
   5henceforth as AEM.
   6
   7Supported systems:
   8  * Any recent IBM System X server with AEM support.
   9    This includes the x3350, x3550, x3650, x3655, x3755, x3850 M2,
  10    x3950 M2, and certain HS2x/LS2x/QS2x blades.  The IPMI host interface
  11    driver ("ipmi-si") needs to be loaded for this driver to do anything.
  12    Prefix: 'ibmaem'
  13    Datasheet: Not available
  14
  15Author: Darrick J. Wong
  16
  17Description
  18-----------
  19
  20This driver implements sensor reading support for the energy and power meters
  21available on various IBM System X hardware through the BMC.  All sensor banks
  22will be exported as platform devices; this driver can talk to both v1 and v2
  23interfaces.  This driver is completely separate from the older ibmpex driver.
  24
  25The v1 AEM interface has a simple set of features to monitor energy use.  There
  26is a register that displays an estimate of raw energy consumption since the
  27last BMC reset, and a power sensor that returns average power use over a
  28configurable interval.
  29
  30The v2 AEM interface is a bit more sophisticated, being able to present a wider
  31range of energy and power use registers, the power cap as set by the AEM
  32software, and temperature sensors.
  33
  34Special Features
  35----------------
  36
  37The "power_cap" value displays the current system power cap, as set by the AEM
  38software.  Setting the power cap from the host is not currently supported.
  39