Kernel driver lm70
  ==================

  Supported chips:

    * National Semiconductor LM70
      Datasheet: http://www.national.com/pf/LM/LM70.html

    * Texas Instruments TMP121/TMP123
      Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html

  
  Author:
          Kaiwan N Billimoria <kaiwan@designergraphix.com>
  
  Description
  -----------
  
  This driver implements support for the National Semiconductor LM70
  temperature sensor.
  
  The LM70 temperature sensor chip supports a single temperature sensor.
  It communicates with a host processor (or microcontroller) via an
  SPI/Microwire Bus interface.
  
  Communication with the LM70 is simple: when the temperature is to be sensed,
  the driver accesses the LM70 using SPI communication: 16 SCLK cycles
  comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's
  complement digital temperature (sent via the SIO line), is available in the
  driver for interpretation. This driver makes use of the kernel's in-core
  SPI support.

  As a real (in-tree) example of this "SPI protocol driver" interfacing
  with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
  and its associated documentation.

  The TMP121/TMP123 are very similar; main differences are 4 wire SPI inter-
  face (read only) and 13-bit temperature data (0.0625 degrees celsius reso-
  lution).

  Thanks to
  ---------
  Jean Delvare <khali@linux-fr.org> for mentoring the hwmon-side driver
  development.