1 Kernel driver smsc47m1
2 ======================
3
4 Supported chips:
5 * SMSC LPC47B27x, LPC47M10x, LPC47M13x, LPC47M14x, LPC47M15x and LPC47M192
6 Addresses scanned: none, address read from Super I/O config space
7 Prefix: 'smsc47m1'
8 Datasheets:
9 http://www.smsc.com/main/datasheets/47b27x.pdf
10 http://www.smsc.com/main/datasheets/47m10x.pdf
11 http://www.smsc.com/main/tools/discontinued/47m13x.pdf
12 http://www.smsc.com/main/datasheets/47m14x.pdf
13 http://www.smsc.com/main/tools/discontinued/47m15x.pdf
14 http://www.smsc.com/main/datasheets/47m192.pdf
15 * SMSC LPC47M997
16 Addresses scanned: none, address read from Super I/O config space
17 Prefix: 'smsc47m1'
18 Datasheet: none
19
20 Authors:
21 Mark D. Studebaker <mdsxyz123@yahoo.com>,
22 With assistance from Bruce Allen <ballen@uwm.edu>, and his
23 fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
24 Gabriele Gorla <gorlik@yahoo.com>,
25 Jean Delvare <khali@linux-fr.org>
26
27 Description
28 -----------
29
30 The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
31 contain monitoring and PWM control circuitry for two fans.
32
33 The 47M15x and 47M192 chips contain a full 'hardware monitoring block'
34 in addition to the fan monitoring and control. The hardware monitoring
35 block is not supported by the driver.
36
37 No documentation is available for the 47M997, but it has the same device
38 ID as the 47M15x and 47M192 chips and seems to be compatible.
39
40 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
41 triggered if the rotation speed has dropped below a programmable limit. Fan
42 readings can be divided by a programmable divider (1, 2, 4 or 8) to give
43 the readings more range or accuracy. Not all RPM values can accurately be
44 represented, so some rounding is done. With a divider of 2, the lowest
45 representable value is around 2600 RPM.
46
47 PWM values are from 0 to 255.
48
49 If an alarm triggers, it will remain triggered until the hardware register
50 is read at least once. This means that the cause for the alarm may
51 already have disappeared! Note that in the current implementation, all
52 hardware registers are read whenever any data is read (unless it is less
53 than 1.5 seconds since the last update). This means that you can easily
54 miss once-only alarms.
55
56
57 **********************
58 The lm_sensors project gratefully acknowledges the support of
59 Intel in the development of this driver.
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