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Based on kernel version 3.16. Page generated on 2014-08-06 21:39 EST.

1	Kernel driver emc1403
2	=====================
3	
4	Supported chips:
5	  * SMSC / Microchip EMC1402, EMC1412
6	    Addresses scanned: I2C 0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c
7	    Prefix: 'emc1402'
8	    Datasheets:
9		http://ww1.microchip.com/downloads/en/DeviceDoc/1412.pdf
10		http://ww1.microchip.com/downloads/en/DeviceDoc/1402.pdf
11	  * SMSC / Microchip EMC1403, EMC1404, EMC1413, EMC1414
12	    Addresses scanned: I2C 0x18, 0x29, 0x4c, 0x4d
13	    Prefix: 'emc1403', 'emc1404'
14	    Datasheets:
15		http://ww1.microchip.com/downloads/en/DeviceDoc/1403_1404.pdf
16		http://ww1.microchip.com/downloads/en/DeviceDoc/1413_1414.pdf
17	  * SMSC / Microchip EMC1422
18	    Addresses scanned: I2C 0x4c
19	    Prefix: 'emc1422'
20	    Datasheet:
21		http://ww1.microchip.com/downloads/en/DeviceDoc/1422.pdf
22	  * SMSC / Microchip EMC1423, EMC1424
23	    Addresses scanned: I2C 0x4c
24	    Prefix: 'emc1423', 'emc1424'
25	    Datasheet:
26		http://ww1.microchip.com/downloads/en/DeviceDoc/1423_1424.pdf
27	
28	Author:
29	    Kalhan Trisal <kalhan.trisal@intel.com
30	
31	
32	Description
33	-----------
34	
35	The Standard Microsystems Corporation (SMSC) / Microchip EMC14xx chips
36	contain up to four temperature sensors. EMC14x2 support two sensors
37	(one internal, one external). EMC14x3 support three sensors (one internal,
38	two external), and EMC14x4 support four sensors (one internal, three
39	external).
40	
41	The chips implement three limits for each sensor: low (tempX_min), high
42	(tempX_max) and critical (tempX_crit.) The chips also implement an
43	hysteresis mechanism which applies to all limits. The relative difference
44	is stored in a single register on the chip, which means that the relative
45	difference between the limit and its hysteresis is always the same for
46	all three limits.
47	
48	This implementation detail implies the following:
49	* When setting a limit, its hysteresis will automatically follow, the
50	  difference staying unchanged. For example, if the old critical limit
51	  was 80 degrees C, and the hysteresis was 75 degrees C, and you change
52	  the critical limit to 90 degrees C, then the hysteresis will
53	  automatically change to 85 degrees C.
54	* The hysteresis values can't be set independently. We decided to make
55	  only temp1_crit_hyst writable, while all other hysteresis attributes
56	  are read-only. Setting temp1_crit_hyst writes the difference between
57	  temp1_crit_hyst and temp1_crit into the chip, and the same relative
58	  hysteresis applies automatically to all other limits.
59	* The limits should be set before the hysteresis.
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