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Based on kernel version 3.9. Page generated on 2013-05-02 23:07 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	  * National Semiconductor LM71
10	    Datasheet: http://www.ti.com/product/LM71
11	  * National Semiconductor LM74
12	    Datasheet: http://www.ti.com/product/LM74
13	
14	Author:
15	        Kaiwan N Billimoria <kaiwan@designergraphix.com>
16	
17	Description
18	-----------
19	
20	This driver implements support for the National Semiconductor LM70
21	temperature sensor.
22	
23	The LM70 temperature sensor chip supports a single temperature sensor.
24	It communicates with a host processor (or microcontroller) via an
25	SPI/Microwire Bus interface.
26	
27	Communication with the LM70 is simple: when the temperature is to be sensed,
28	the driver accesses the LM70 using SPI communication: 16 SCLK cycles
29	comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's
30	complement digital temperature (sent via the SIO line), is available in the
31	driver for interpretation. This driver makes use of the kernel's in-core
32	SPI support.
33	
34	As a real (in-tree) example of this "SPI protocol driver" interfacing
35	with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
36	and its associated documentation.
37	
38	The LM74 and TMP121/TMP123 are very similar; main difference is 13-bit
39	temperature data (0.0625 degrees celsius resolution).
40	
41	The LM71 is also very similar; main difference is 14-bit temperature
42	data (0.03125 degrees celsius resolution).
43	
44	Thanks to
45	---------
46	Jean Delvare <khali@linux-fr.org> for mentoring the hwmon-side driver
47	development.
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