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7f15b664 RM |
1 | Kernel driver smsc47m1 |
2 | ====================== | |
3 | ||
4 | Supported chips: | |
6091780e JD |
5 | * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x, |
6 | LPC47M15x and LPC47M192 | |
7f15b664 RM |
7 | Addresses scanned: none, address read from Super I/O config space |
8 | Prefix: 'smsc47m1' | |
9 | Datasheets: | |
0ea6e611 JM |
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/ | |
8eccbb6f JD |
14 | * SMSC LPC47M292 |
15 | Addresses scanned: none, address read from Super I/O config space | |
16 | Prefix: 'smsc47m2' | |
17 | Datasheet: Not public | |
b890a07f JD |
18 | * SMSC LPC47M997 |
19 | Addresses scanned: none, address read from Super I/O config space | |
20 | Prefix: 'smsc47m1' | |
21 | Datasheet: none | |
7f15b664 RM |
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>, | |
7c81c60f | 28 | Jean Delvare <jdelvare@suse.de> |
7f15b664 RM |
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 | ||
8eccbb6f JD |
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. | |
7f15b664 | 40 | |
b890a07f JD |
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 | ||
7f15b664 RM |
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. |