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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 | ||
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16 | Thanks to Kris Chen and Aaron Huang from Fintek for answering technical |
17 | questions and providing additional documentation. | |
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18 | |
19 | Thanks to Chris Lin from Jetway for providing wiring schematics and | |
15fe25ca | 20 | answering technical questions. |
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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 | |
e9cea646 | 31 | three different modes (one manual, two automatic). |
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32 | |
33 | The driver assumes that no more than one chip is present, which seems | |
34 | reasonable. | |
35 | ||
36 | ||
37 | Voltage Monitoring | |
38 | ------------------ | |
39 | ||
40 | Voltages are sampled by an 8-bit ADC with a LSB of 8 mV. The supported | |
41 | range is thus from 0 to 2.040 V. Voltage values outside of this range | |
42 | need external resistors. An exception is in0, which is used to monitor | |
43 | the chip's own power source (+3.3V), and is divided internally by a | |
44 | factor 2. | |
45 | ||
46 | The two LSB of the voltage limit registers are not used (always 0), so | |
47 | you can only set the limits in steps of 32 mV (before scaling). | |
48 | ||
49 | The wirings and resistor values suggested by Fintek are as follow: | |
50 | ||
51 | pin expected | |
52 | name use R1 R2 divider raw val. | |
53 | ||
54 | in0 VCC VCC3.3V int. int. 2.00 1.65 V | |
55 | in1 VIN1 VTT1.2V 10K - 1.00 1.20 V | |
56 | in2 VIN2 VRAM 100K 100K 2.00 ~1.25 V (1) | |
57 | in3 VIN3 VCHIPSET 47K 100K 1.47 2.24 V (2) | |
58 | in4 VIN4 VCC5V 200K 47K 5.25 0.95 V | |
59 | in5 VIN5 +12V 200K 20K 11.00 1.05 V | |
60 | in6 VIN6 VCC1.5V 10K - 1.00 1.50 V | |
61 | in7 VIN7 VCORE 10K - 1.00 ~1.40 V (1) | |
62 | in8 VIN8 VSB5V 200K 47K 1.00 0.95 V | |
63 | ||
64 | (1) Depends on your hardware setup. | |
65 | (2) Obviously not correct, swapping R1 and R2 would make more sense. | |
66 | ||
67 | These values can be used as hints at best, as motherboard manufacturers | |
68 | are free to use a completely different setup. As a matter of fact, the | |
69 | Jetway K8M8MS uses a significantly different setup. You will have to | |
70 | find out documentation about your own motherboard, and edit sensors.conf | |
71 | accordingly. | |
72 | ||
73 | Each voltage measured has associated low and high limits, each of which | |
74 | triggers an alarm when crossed. | |
75 | ||
76 | ||
77 | Fan Monitoring | |
78 | -------------- | |
79 | ||
80 | Fan rotation speeds are reported as 12-bit values from a gated clock | |
81 | signal. Speeds down to 366 RPM can be measured. There is no theoretical | |
82 | high limit, but values over 6000 RPM seem to cause problem. The effective | |
83 | resolution is much lower than you would expect, the step between different | |
84 | register values being 10 rather than 1. | |
85 | ||
86 | The chip assumes 2 pulse-per-revolution fans. | |
87 | ||
88 | An alarm is triggered if the rotation speed drops below a programmable | |
89 | limit or is too low to be measured. | |
90 | ||
91 | ||
92 | Temperature Monitoring | |
93 | ---------------------- | |
94 | ||
95 | Temperatures are reported in degrees Celsius. Each temperature measured | |
96 | has a high limit, those crossing triggers an alarm. There is an associated | |
97 | hysteresis value, below which the temperature has to drop before the | |
98 | alarm is cleared. | |
99 | ||
100 | All temperature channels are external, there is no embedded temperature | |
101 | sensor. Each channel can be used for connecting either a thermal diode | |
102 | or a thermistor. The driver reports the currently selected mode, but | |
103 | doesn't allow changing it. In theory, the BIOS should have configured | |
104 | everything properly. | |
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105 | |
106 | ||
107 | Fan Control | |
108 | ----------- | |
109 | ||
110 | Both PWM (pulse-width modulation) and DC fan speed control methods are | |
111 | supported. The right one to use depends on external circuitry on the | |
112 | motherboard, so the driver assumes that the BIOS set the method | |
113 | properly. The driver will report the method, but won't let you change | |
114 | it. | |
115 | ||
116 | When the PWM method is used, you can select the operating frequency, | |
117 | from 187.5 kHz (default) to 31 Hz. The best frequency depends on the | |
118 | fan model. As a rule of thumb, lower frequencies seem to give better | |
119 | control, but may generate annoying high-pitch noise. Fintek recommends | |
120 | not going below 1 kHz, as the fan tachometers get confused by lower | |
121 | frequencies as well. | |
122 | ||
123 | When the DC method is used, Fintek recommends not going below 5 V, which | |
124 | corresponds to a pwm value of 106 for the driver. The driver doesn't | |
125 | enforce this limit though. | |
126 | ||
127 | Three different fan control modes are supported: | |
128 | ||
129 | * Manual mode | |
130 | You ask for a specific PWM duty cycle or DC voltage. | |
131 | ||
132 | * Fan speed mode | |
133 | You ask for a specific fan speed. This mode assumes that pwm1 | |
134 | corresponds to fan1, pwm2 to fan2 and pwm3 to fan3. | |
135 | ||
136 | * Temperature mode | |
137 | You define 3 temperature/fan speed trip points, and the fan speed is | |
138 | adjusted depending on the measured temperature, using interpolation. | |
139 | This mode is not yet supported by the driver. |