linux/Documentation/hwmon/lm70
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   1Kernel driver lm70
   2==================
   3
   4Supported chips:
   5  * National Semiconductor LM70
   6    Datasheet: http://www.national.com/pf/LM/LM70.html
   7  * Texas Instruments TMP121/TMP123
   8    Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html
   9
  10Author:
  11        Kaiwan N Billimoria <kaiwan@designergraphix.com>
  12
  13Description
  14-----------
  15
  16This driver implements support for the National Semiconductor LM70
  17temperature sensor.
  18
  19The LM70 temperature sensor chip supports a single temperature sensor.
  20It communicates with a host processor (or microcontroller) via an
  21SPI/Microwire Bus interface.
  22
  23Communication with the LM70 is simple: when the temperature is to be sensed,
  24the driver accesses the LM70 using SPI communication: 16 SCLK cycles
  25comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's
  26complement digital temperature (sent via the SIO line), is available in the
  27driver for interpretation. This driver makes use of the kernel's in-core
  28SPI support.
  29
  30As a real (in-tree) example of this "SPI protocol driver" interfacing
  31with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
  32and its associated documentation.
  33
  34The TMP121/TMP123 are very similar; main differences are 4 wire SPI inter-
  35face (read only) and 13-bit temperature data (0.0625 degrees celsius reso-
  36lution).
  37
  38Thanks to
  39---------
  40Jean Delvare <khali@linux-fr.org> for mentoring the hwmon-side driver
  41development.
  42
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