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Based on kernel version 2.6.33. Page generated on 2010-02-24 15:36 EST.

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