Commit | Line | Data |
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5db3d3da JD |
1 | Kernel driver f71805f |
2 | ===================== | |
3 | ||
4 | Supported chips: | |
5 | * Fintek F71805F/FG | |
6 | Prefix: 'f71805f' | |
7 | Addresses scanned: none, address read from Super I/O config space | |
8 | Datasheet: Provided by Fintek on request | |
9 | ||
10 | Author: Jean Delvare <khali@linux-fr.org> | |
11 | ||
12 | Thanks to Denis Kieft from Barracuda Networks for the donation of a | |
13 | test system (custom Jetway K8M8MS motherboard, with CPU and RAM) and | |
14 | for providing initial documentation. | |
15 | ||
16 | Thanks to Kris Chen from Fintek for answering technical questions and | |
17 | providing additional documentation. | |
18 | ||
19 | Thanks to Chris Lin from Jetway for providing wiring schematics and | |
20 | anwsering technical questions. | |
21 | ||
22 | ||
23 | Description | |
24 | ----------- | |
25 | ||
26 | The Fintek F71805F/FG Super I/O chip includes complete hardware monitoring | |
27 | capabilities. It can monitor up to 9 voltages (counting its own power | |
28 | source), 3 fans and 3 temperature sensors. | |
29 | ||
30 | This chip also has fan controlling features, using either DC or PWM, in | |
31 | three different modes (one manual, two automatic). The driver doesn't | |
32 | support these features yet. | |
33 | ||
34 | The driver assumes that no more than one chip is present, which seems | |
35 | reasonable. | |
36 | ||
37 | ||
38 | Voltage Monitoring | |
39 | ------------------ | |
40 | ||
41 | Voltages are sampled by an 8-bit ADC with a LSB of 8 mV. The supported | |
42 | range is thus from 0 to 2.040 V. Voltage values outside of this range | |
43 | need external resistors. An exception is in0, which is used to monitor | |
44 | the chip's own power source (+3.3V), and is divided internally by a | |
45 | factor 2. | |
46 | ||
47 | The two LSB of the voltage limit registers are not used (always 0), so | |
48 | you can only set the limits in steps of 32 mV (before scaling). | |
49 | ||
50 | The wirings and resistor values suggested by Fintek are as follow: | |
51 | ||
52 | pin expected | |
53 | name use R1 R2 divider raw val. | |
54 | ||
55 | in0 VCC VCC3.3V int. int. 2.00 1.65 V | |
56 | in1 VIN1 VTT1.2V 10K - 1.00 1.20 V | |
57 | in2 VIN2 VRAM 100K 100K 2.00 ~1.25 V (1) | |
58 | in3 VIN3 VCHIPSET 47K 100K 1.47 2.24 V (2) | |
59 | in4 VIN4 VCC5V 200K 47K 5.25 0.95 V | |
60 | in5 VIN5 +12V 200K 20K 11.00 1.05 V | |
61 | in6 VIN6 VCC1.5V 10K - 1.00 1.50 V | |
62 | in7 VIN7 VCORE 10K - 1.00 ~1.40 V (1) | |
63 | in8 VIN8 VSB5V 200K 47K 1.00 0.95 V | |
64 | ||
65 | (1) Depends on your hardware setup. | |
66 | (2) Obviously not correct, swapping R1 and R2 would make more sense. | |
67 | ||
68 | These values can be used as hints at best, as motherboard manufacturers | |
69 | are free to use a completely different setup. As a matter of fact, the | |
70 | Jetway K8M8MS uses a significantly different setup. You will have to | |
71 | find out documentation about your own motherboard, and edit sensors.conf | |
72 | accordingly. | |
73 | ||
74 | Each voltage measured has associated low and high limits, each of which | |
75 | triggers an alarm when crossed. | |
76 | ||
77 | ||
78 | Fan Monitoring | |
79 | -------------- | |
80 | ||
81 | Fan rotation speeds are reported as 12-bit values from a gated clock | |
82 | signal. Speeds down to 366 RPM can be measured. There is no theoretical | |
83 | high limit, but values over 6000 RPM seem to cause problem. The effective | |
84 | resolution is much lower than you would expect, the step between different | |
85 | register values being 10 rather than 1. | |
86 | ||
87 | The chip assumes 2 pulse-per-revolution fans. | |
88 | ||
89 | An alarm is triggered if the rotation speed drops below a programmable | |
90 | limit or is too low to be measured. | |
91 | ||
92 | ||
93 | Temperature Monitoring | |
94 | ---------------------- | |
95 | ||
96 | Temperatures are reported in degrees Celsius. Each temperature measured | |
97 | has a high limit, those crossing triggers an alarm. There is an associated | |
98 | hysteresis value, below which the temperature has to drop before the | |
99 | alarm is cleared. | |
100 | ||
101 | All temperature channels are external, there is no embedded temperature | |
102 | sensor. Each channel can be used for connecting either a thermal diode | |
103 | or a thermistor. The driver reports the currently selected mode, but | |
104 | doesn't allow changing it. In theory, the BIOS should have configured | |
105 | everything properly. |