Kernel driver lm75
  ==================
  
  Supported chips:
    * National Semiconductor LM75
      Prefix: 'lm75'
      Addresses scanned: I2C 0x48 - 0x4f
      Datasheet: Publicly available at the National Semiconductor website
                 http://www.national.com/

    * National Semiconductor LM75A
      Prefix: 'lm75a'
      Addresses scanned: I2C 0x48 - 0x4f
      Datasheet: Publicly available at the National Semiconductor website
                 http://www.national.com/

    * Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
      Prefixes: 'ds75', 'ds1775', 'ds7505'

      Addresses scanned: none

      Datasheet: Publicly available at the Maxim website
                 http://www.maximintegrated.com/

    * Maxim MAX6625, MAX6626

      Prefixes: 'max6625', 'max6626'
      Addresses scanned: none

      Datasheet: Publicly available at the Maxim website
                 http://www.maxim-ic.com/
    * Microchip (TelCom) TCN75

      Prefix: 'tcn75'

      Addresses scanned: none
      Datasheet: Publicly available at the Microchip website
                 http://www.microchip.com/
    * Microchip MCP9800, MCP9801, MCP9802, MCP9803
      Prefix: 'mcp980x'
      Addresses scanned: none

      Datasheet: Publicly available at the Microchip website
                 http://www.microchip.com/

    * Analog Devices ADT75
      Prefix: 'adt75'

      Addresses scanned: none

      Datasheet: Publicly available at the Analog Devices website
                 http://www.analog.com/adt75

    * ST Microelectronics STDS75
      Prefix: 'stds75'
      Addresses scanned: none
      Datasheet: Publicly available at the ST website
                 http://www.st.com/internet/analog/product/121769.jsp

    * Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP75C, TMP175, TMP275
      Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75c', 'tmp275'

      Addresses scanned: none
      Datasheet: Publicly available at the Texas Instruments website
                 http://www.ti.com/product/tmp100
                 http://www.ti.com/product/tmp101
                 http://www.ti.com/product/tmp105

                 http://www.ti.com/product/tmp112

                 http://www.ti.com/product/tmp75

                 http://www.ti.com/product/tmp75c

                 http://www.ti.com/product/tmp175
                 http://www.ti.com/product/tmp275

    * NXP LM75B
      Prefix: 'lm75b'
      Addresses scanned: none
      Datasheet: Publicly available at the NXP website
                 http://www.nxp.com/documents/data_sheet/LM75B.pdf

  
  Author: Frodo Looijaard <frodol@dds.nl>
  
  Description
  -----------
  
  The LM75 implements one temperature sensor. Limits can be set through the
  Overtemperature Shutdown register and Hysteresis register. Each value can be
  set and read to half-degree accuracy.
  An alarm is issued (usually to a connected LM78) when the temperature
  gets higher then the Overtemperature Shutdown value; it stays on until
  the temperature falls below the Hysteresis value.
  All temperatures are in degrees Celsius, and are guaranteed within a
  range of -55 to +125 degrees.

  The driver caches the values for a period varying between 1 second for the
  slowest chips and 125 ms for the fastest chips; reading it more often

  will do no harm, but will return 'old' values.

  The original LM75 was typically used in combination with LM78-like chips
  on PC motherboards, to measure the temperature of the processor(s). Clones
  are now used in various embedded designs.

  
  The LM75 is essentially an industry standard; there may be other
  LM75 clones not listed here, with or without various enhancements,

  that are supported. The clones are not detected by the driver, unless
  they reproduce the exact register tricks of the original LM75, and must

  therefore be instantiated explicitly. Higher resolution up to 12-bit
  is supported by this driver, other specific enhancements are not.

  
  The LM77 is not supported, contrary to what we pretended for a long time.
  Both chips are simply not compatible, value encoding differs.