linux/Documentation/hwmon/asb100
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   1Kernel driver asb100
   2====================
   3
   4Supported Chips:
   5  * Asus ASB100 and ASB100-A "Bach"
   6    Prefix: 'asb100'
   7    Addresses scanned: I2C 0x2d
   8    Datasheet: none released
   9
  10Author: Mark M. Hoffman <mhoffman@lightlink.com>
  11
  12Description
  13-----------
  14
  15This driver implements support for the Asus ASB100 and ASB100-A "Bach".
  16These are custom ASICs available only on Asus mainboards. Asus refuses to
  17supply a datasheet for these chips. Thanks go to many people who helped
  18investigate their hardware, including:
  19
  20Vitaly V. Bursov
  21Alexander van Kaam (author of MBM for Windows)
  22Bertrik Sikken
  23
  24The ASB100 implements seven voltage sensors, three fan rotation speed
  25sensors, four temperature sensors, VID lines and alarms. In addition to
  26these, the ASB100-A also implements a single PWM controller for fans 2 and
  273 (i.e. one setting controls both.) If you have a plain ASB100, the PWM
  28controller will simply not work (or maybe it will for you... it doesn't for
  29me).
  30
  31Temperatures are measured and reported in degrees Celsius.
  32
  33Fan speeds are reported in RPM (rotations per minute). An alarm is
  34triggered if the rotation speed has dropped below a programmable limit.
  35
  36Voltage sensors (also known as IN sensors) report values in volts.
  37
  38The VID lines encode the core voltage value: the voltage level your
  39processor should work with. This is hardcoded by the mainboard and/or
  40processor itself. It is a value in volts.
  41
  42Alarms: (TODO question marks indicate may or may not work)
  43
  440x0001 => in0 (?)
  450x0002 => in1 (?)
  460x0004 => in2
  470x0008 => in3
  480x0010 => temp1 (1)
  490x0020 => temp2
  500x0040 => fan1
  510x0080 => fan2
  520x0100 => in4
  530x0200 => in5 (?) (2)
  540x0400 => in6 (?) (2)
  550x0800 => fan3
  560x1000 => chassis switch
  570x2000 => temp3
  58
  59Alarm Notes:
  60
  61(1) This alarm will only trigger if the hysteresis value is 127C.
  62I.e. it behaves the same as w83781d.
  63
  64(2) The min and max registers for these values appear to
  65be read-only or otherwise stuck at 0x00.
  66
  67TODO:
  68* Experiment with fan divisors > 8.
  69* Experiment with temp. sensor types.
  70* Are there really 13 voltage inputs? Probably not...
  71* Cleanups, no doubt...
  72
  73
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