linux/Documentation/hwmon/smsc47m1
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   1Kernel driver smsc47m1
   2======================
   3
   4Supported chips:
   5  * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x,
   6    LPC47M15x and LPC47M192
   7    Addresses scanned: none, address read from Super I/O config space
   8    Prefix: 'smsc47m1'
   9    Datasheets:
  10        http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf
  11        http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf
  12        http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf
  13        http://www.smsc.com/
  14  * SMSC LPC47M292
  15    Addresses scanned: none, address read from Super I/O config space
  16    Prefix: 'smsc47m2'
  17    Datasheet: Not public
  18  * SMSC LPC47M997
  19    Addresses scanned: none, address read from Super I/O config space
  20    Prefix: 'smsc47m1'
  21    Datasheet: none
  22
  23Authors:
  24        Mark D. Studebaker <mdsxyz123@yahoo.com>,
  25        With assistance from Bruce Allen <ballen@uwm.edu>, and his
  26        fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
  27        Gabriele Gorla <gorlik@yahoo.com>,
  28        Jean Delvare <khali@linux-fr.org>
  29
  30Description
  31-----------
  32
  33The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
  34contain monitoring and PWM control circuitry for two fans.
  35
  36The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
  37monitoring block' in addition to the fan monitoring and control. The
  38hardware monitoring block is not supported by this driver, use the
  39smsc47m192 driver for that.
  40
  41No documentation is available for the 47M997, but it has the same device
  42ID as the 47M15x and 47M192 chips and seems to be compatible.
  43
  44Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
  45triggered if the rotation speed has dropped below a programmable limit. Fan
  46readings can be divided by a programmable divider (1, 2, 4 or 8) to give
  47the readings more range or accuracy. Not all RPM values can accurately be
  48represented, so some rounding is done. With a divider of 2, the lowest
  49representable value is around 2600 RPM.
  50
  51PWM values are from 0 to 255.
  52
  53If an alarm triggers, it will remain triggered until the hardware register
  54is read at least once. This means that the cause for the alarm may
  55already have disappeared! Note that in the current implementation, all
  56hardware registers are read whenever any data is read (unless it is less
  57than 1.5 seconds since the last update). This means that you can easily
  58miss once-only alarms.
  59
  60
  61**********************
  62The lm_sensors project gratefully acknowledges the support of
  63Intel in the development of this driver.
  64
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