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Based on kernel version 3.13. Page generated on 2014-01-20 22:03 EST.

1	Kernel driver smsc47m1
2	======================
3	
4	Supported chips:
5	  * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x,
6	    LPC47M15x and LPC47M192
7	    Addresses scanned: none, address read from Super I/O config space
8	    Prefix: 'smsc47m1'
9	    Datasheets:
10	        http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf
11	        http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf
12	        http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf
13	        http://www.smsc.com/
14	  * SMSC LPC47M292
15	    Addresses scanned: none, address read from Super I/O config space
16	    Prefix: 'smsc47m2'
17	    Datasheet: Not public
18	  * SMSC LPC47M997
19	    Addresses scanned: none, address read from Super I/O config space
20	    Prefix: 'smsc47m1'
21	    Datasheet: none
22	
23	Authors:
24	        Mark D. Studebaker <mdsxyz123@yahoo.com>,
25	        With assistance from Bruce Allen <ballen@uwm.edu>, and his
26	        fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
27	        Gabriele Gorla <gorlik@yahoo.com>,
28	        Jean Delvare <khali@linux-fr.org>
29	
30	Description
31	-----------
32	
33	The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
34	contain monitoring and PWM control circuitry for two fans.
35	
36	The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
37	monitoring block' in addition to the fan monitoring and control. The
38	hardware monitoring block is not supported by this driver, use the
39	smsc47m192 driver for that.
40	
41	No documentation is available for the 47M997, but it has the same device
42	ID as the 47M15x and 47M192 chips and seems to be compatible.
43	
44	Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
45	triggered if the rotation speed has dropped below a programmable limit. Fan
46	readings can be divided by a programmable divider (1, 2, 4 or 8) to give
47	the readings more range or accuracy. Not all RPM values can accurately be
48	represented, so some rounding is done. With a divider of 2, the lowest
49	representable value is around 2600 RPM.
50	
51	PWM values are from 0 to 255.
52	
53	If an alarm triggers, it will remain triggered until the hardware register
54	is read at least once. This means that the cause for the alarm may
55	already have disappeared! Note that in the current implementation, all
56	hardware registers are read whenever any data is read (unless it is less
57	than 1.5 seconds since the last update). This means that you can easily
58	miss once-only alarms.
59	
60	
61	**********************
62	The lm_sensors project gratefully acknowledges the support of
63	Intel in the development of this driver.
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