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  * Texas Instruments TMP122/TMP124
10    Information: http://www.ti.com/product/tmp122
11  * National Semiconductor LM71
12    Datasheet: http://www.ti.com/product/LM71
13  * National Semiconductor LM74
14    Datasheet: http://www.ti.com/product/LM74
15
16Author:
17        Kaiwan N Billimoria <kaiwan@designergraphix.com>
18
19Description
20-----------
21
22This driver implements support for the National Semiconductor LM70
23temperature sensor.
24
25The LM70 temperature sensor chip supports a single temperature sensor.
26It communicates with a host processor (or microcontroller) via an
27SPI/Microwire Bus interface.
28
29Communication with the LM70 is simple: when the temperature is to be sensed,
30the driver accesses the LM70 using SPI communication: 16 SCLK cycles
31comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's
32complement digital temperature (sent via the SIO line), is available in the
33driver for interpretation. This driver makes use of the kernel's in-core
34SPI support.
35
36As a real (in-tree) example of this "SPI protocol driver" interfacing
37with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
38and its associated documentation.
39
40The LM74 and TMP121/TMP122/TMP123/TMP124 are very similar; main difference is
4113-bit temperature data (0.0625 degrees celsius resolution).
42
43The TMP122/TMP124 also feature configurable temperature thresholds.
44
45The LM71 is also very similar; main difference is 14-bit temperature
46data (0.03125 degrees celsius resolution).
47
48Thanks to
49---------
50Jean Delvare <jdelvare@suse.de> for mentoring the hwmon-side driver
51development.
52