Documentation/hwmon/ibmaem

   1 Kernel driver ibmaem
   2 ====================
   3
   4 This driver talks to the IBM Systems Director Active Energy Manager, known
   5 henceforth as AEM.
   6
   7 Supported systems:
   8
   9   * Any recent IBM System X server with AEM support.
  10
  11     This includes the x3350, x3550, x3650, x3655, x3755, x3850 M2,
  12     x3950 M2, and certain HC10/HS2x/LS2x/QS2x blades.
  13
  14     The IPMI host interface
  15     driver ("ipmi-si") needs to be loaded for this driver to do anything.
  16
  17     Prefix: 'ibmaem'
  18
  19     Datasheet: Not available
  20
  21 Author: Darrick J. Wong
  22
  23 Description
  24 -----------
  25
  26 This driver implements sensor reading support for the energy and power meters
  27 available on various IBM System X hardware through the BMC.  All sensor banks
  28 will be exported as platform devices; this driver can talk to both v1 and v2
  29 interfaces.  This driver is completely separate from the older ibmpex driver.
  30
  31 The v1 AEM interface has a simple set of features to monitor energy use.  There
  32 is a register that displays an estimate of raw energy consumption since the
  33 last BMC reset, and a power sensor that returns average power use over a
  34 configurable interval.
  35
  36 The v2 AEM interface is a bit more sophisticated, being able to present a wider
  37 range of energy and power use registers, the power cap as set by the AEM
  38 software, and temperature sensors.
  39
  40 Special Features
  41 ----------------
  42
  43 The "power_cap" value displays the current system power cap, as set by the AEM
  44 software.  Setting the power cap from the host is not currently supported.