Documentation/hwmon/asb100.rst

   1 Kernel driver asb100
   2 ====================
   3
   4 Supported Chips:
   5
   6   * Asus ASB100 and ASB100-A "Bach"
   7
   8     Prefix: 'asb100'
   9
  10     Addresses scanned: I2C 0x2d
  11
  12     Datasheet: none released
  13
  14 Author: Mark M. Hoffman <mhoffman@lightlink.com>
  15
  16 Description
  17 -----------
  18
  19 This driver implements support for the Asus ASB100 and ASB100-A "Bach".
  20 These are custom ASICs available only on Asus mainboards. Asus refuses to
  21 supply a datasheet for these chips. Thanks go to many people who helped
  22 investigate their hardware, including:
  23
  24 Vitaly V. Bursov
  25 Alexander van Kaam (author of MBM for Windows)
  26 Bertrik Sikken
  27
  28 The ASB100 implements seven voltage sensors, three fan rotation speed
  29 sensors, four temperature sensors, VID lines and alarms. In addition to
  30 these, the ASB100-A also implements a single PWM controller for fans 2 and
  31 3 (i.e. one setting controls both.) If you have a plain ASB100, the PWM
  32 controller will simply not work (or maybe it will for you... it doesn't for
  33 me).
  34
  35 Temperatures are measured and reported in degrees Celsius.
  36
  37 Fan speeds are reported in RPM (rotations per minute). An alarm is
  38 triggered if the rotation speed has dropped below a programmable limit.
  39
  40 Voltage sensors (also known as IN sensors) report values in volts.
  41
  42 The VID lines encode the core voltage value: the voltage level your
  43 processor should work with. This is hardcoded by the mainboard and/or
  44 processor itself. It is a value in volts.
  45
  46 Alarms: (TODO question marks indicate may or may not work)
  47
  48 - 0x0001 => in0 (?)
  49 - 0x0002 => in1 (?)
  50 - 0x0004 => in2
  51 - 0x0008 => in3
  52 - 0x0010 => temp1 [1]_
  53 - 0x0020 => temp2
  54 - 0x0040 => fan1
  55 - 0x0080 => fan2
  56 - 0x0100 => in4
  57 - 0x0200 => in5 (?) [2]_
  58 - 0x0400 => in6 (?) [2]_
  59 - 0x0800 => fan3
  60 - 0x1000 => chassis switch
  61 - 0x2000 => temp3
  62
  63 .. [1]  This alarm will only trigger if the hysteresis value is 127C.
  64         I.e. it behaves the same as w83781d.
  65
  66 .. [2]  The min and max registers for these values appear to
  67         be read-only or otherwise stuck at 0x00.
  68
  69 TODO:
  70   * Experiment with fan divisors > 8.
  71   * Experiment with temp. sensor types.
  72   * Are there really 13 voltage inputs? Probably not...
  73   * Cleanups, no doubt...