Kernel driver lm73
  ==================
  
  Supported chips:

    * Texas Instruments LM73

      Prefix: 'lm73'

      Addresses scanned: I2C 0x48, 0x49, 0x4a, 0x4c, 0x4d, and 0x4e

      Datasheet: Publicly available at the Texas Instruments website

  	       https://www.ti.com/product/lm73

  
  Author: Guillaume Ligneul <guillaume.ligneul@gmail.com>

  Documentation: Chris Verges <kg4ysn@gmail.com>
  
  
  Description
  -----------
  
  The LM73 is a digital temperature sensor.  All temperature values are
  given in degrees Celsius.
  
  Measurement Resolution Support
  ------------------------------
  
  The LM73 supports four resolutions, defined in terms of degrees C per
  LSB: 0.25, 0.125, 0.0625, and 0.3125.  Changing the resolution mode
  affects the conversion time of the LM73's analog-to-digital converter.
  From userspace, the desired resolution can be specified as a function of
  conversion time via the 'update_interval' sysfs attribute for the
  device.  This attribute will normalize ranges of input values to the
  maximum times defined for the resolution in the datasheet.

      ============= ============= ============

      Resolution    Conv. Time    Input Range
      (C/LSB)       (msec)        (msec)

      ============= ============= ============

      0.25          14             0..14
      0.125         28            15..28
      0.0625        56            29..56
      0.03125       112           57..infinity

      ============= ============= ============

  
  The following examples show how the 'update_interval' attribute can be

  used to change the conversion time::

  
      $ echo 0 > update_interval
      $ cat update_interval
      14
      $ cat temp1_input
      24250
  
      $ echo 22 > update_interval
      $ cat update_interval
      28
      $ cat temp1_input
      24125
  
      $ echo 56 > update_interval
      $ cat update_interval
      56
      $ cat temp1_input
      24062
  
      $ echo 85 > update_interval
      $ cat update_interval
      112
      $ cat temp1_input
      24031
  
  As shown here, the lm73 driver automatically adjusts any user input for
  'update_interval' via a step function.  Reading back the
  'update_interval' value after a write operation will confirm the
  conversion time actively in use.
  
  Mathematically, the resolution can be derived from the conversion time
  via the following function:
  
     g(x) = 0.250 * [log(x/14) / log(2)]
  
  where 'x' is the output from 'update_interval' and 'g(x)' is the
  resolution in degrees C per LSB.

  
  Alarm Support
  -------------
  
  The LM73 features a simple over-temperature alarm mechanism.  This
  feature is exposed via the sysfs attributes.
  
  The attributes 'temp1_max_alarm' and 'temp1_min_alarm' are flags
  provided by the LM73 that indicate whether the measured temperature has
  passed the 'temp1_max' and 'temp1_min' thresholds, respectively.  These
  values _must_ be read to clear the registers on the LM73.