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Commit | Line | Data |
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ba224e2c JD |
1 | Kernel driver pc87427 |
2 | ===================== | |
3 | ||
4 | Supported chips: | |
5 | * National Semiconductor PC87427 | |
6 | Prefix: 'pc87427' | |
7 | Addresses scanned: none, address read from Super I/O config space | |
8 | Datasheet: http://www.winbond.com.tw/E-WINBONDHTM/partner/apc_007.html | |
9 | ||
10 | Author: Jean Delvare <khali@linux-fr.org> | |
11 | ||
12 | Thanks to Amir Habibi at Candelis for setting up a test system, and to | |
13 | Michael Kress for testing several iterations of this driver. | |
14 | ||
15 | ||
16 | Description | |
17 | ----------- | |
18 | ||
19 | The National Semiconductor Super I/O chip includes complete hardware | |
20 | monitoring capabilities. It can monitor up to 18 voltages, 8 fans and | |
21 | 6 temperature sensors. Only the fans are supported at the moment. | |
22 | ||
23 | This chip also has fan controlling features, which are not yet supported | |
24 | by this driver either. | |
25 | ||
26 | The driver assumes that no more than one chip is present, which seems | |
27 | reasonable. | |
28 | ||
29 | ||
30 | Fan Monitoring | |
31 | -------------- | |
32 | ||
33 | Fan rotation speeds are reported as 14-bit values from a gated clock | |
34 | signal. Speeds down to 83 RPM can be measured. | |
35 | ||
36 | An alarm is triggered if the rotation speed drops below a programmable | |
37 | limit. Another alarm is triggered if the speed is too low to to be measured | |
38 | (including stalled or missing fan). |