cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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smsc47m1.rst (2589B)

      1Kernel driver smsc47m1
      2======================
      3
      4Supported chips:
      5
      6  * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x,
      7
      8    LPC47M15x and LPC47M192
      9
     10    Addresses scanned: none, address read from Super I/O config space
     11
     12    Prefix: 'smsc47m1'
     13
     14    Datasheets:
     15
     16	http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf
     17
     18	http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf
     19
     20	http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf
     21
     22	http://www.smsc.com/
     23
     24  * SMSC LPC47M292
     25
     26    Addresses scanned: none, address read from Super I/O config space
     27
     28    Prefix: 'smsc47m2'
     29
     30    Datasheet: Not public
     31
     32  * SMSC LPC47M997
     33
     34    Addresses scanned: none, address read from Super I/O config space
     35
     36    Prefix: 'smsc47m1'
     37
     38    Datasheet: none
     39
     40
     41
     42Authors:
     43
     44     - Mark D. Studebaker <mdsxyz123@yahoo.com>,
     45     - With assistance from Bruce Allen <ballen@uwm.edu>, and his
     46       fan.c program:
     47
     48       - http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
     49
     50     - Gabriele Gorla <gorlik@yahoo.com>,
     51     - Jean Delvare <jdelvare@suse.de>
     52
     53Description
     54-----------
     55
     56The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
     57contain monitoring and PWM control circuitry for two fans.
     58
     59The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
     60monitoring block' in addition to the fan monitoring and control. The
     61hardware monitoring block is not supported by this driver, use the
     62smsc47m192 driver for that.
     63
     64No documentation is available for the 47M997, but it has the same device
     65ID as the 47M15x and 47M192 chips and seems to be compatible.
     66
     67Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
     68triggered if the rotation speed has dropped below a programmable limit. Fan
     69readings can be divided by a programmable divider (1, 2, 4 or 8) to give
     70the readings more range or accuracy. Not all RPM values can accurately be
     71represented, so some rounding is done. With a divider of 2, the lowest
     72representable value is around 2600 RPM.
     73
     74PWM values are from 0 to 255.
     75
     76If an alarm triggers, it will remain triggered until the hardware register
     77is read at least once. This means that the cause for the alarm may
     78already have disappeared! Note that in the current implementation, all
     79hardware registers are read whenever any data is read (unless it is less
     80than 1.5 seconds since the last update). This means that you can easily
     81miss once-only alarms.
     82
     83------------------------------------------------------------------
     84
     85The lm_sensors project gratefully acknowledges the support of
     86Intel in the development of this driver.