Kernel driver f71805f ===================== Supported chips: * Fintek F71805F/FG Prefix: 'f71805f' Addresses scanned: none, address read from Super I/O config space Datasheet: Provided by Fintek on request Author: Jean Delvare Thanks to Denis Kieft from Barracuda Networks for the donation of a test system (custom Jetway K8M8MS motherboard, with CPU and RAM) and for providing initial documentation. Thanks to Kris Chen from Fintek for answering technical questions and providing additional documentation. Thanks to Chris Lin from Jetway for providing wiring schematics and answering technical questions. Description ----------- The Fintek F71805F/FG Super I/O chip includes complete hardware monitoring capabilities. It can monitor up to 9 voltages (counting its own power source), 3 fans and 3 temperature sensors. This chip also has fan controlling features, using either DC or PWM, in three different modes (one manual, two automatic). The driver doesn't support these features yet. The driver assumes that no more than one chip is present, which seems reasonable. Voltage Monitoring ------------------ Voltages are sampled by an 8-bit ADC with a LSB of 8 mV. The supported range is thus from 0 to 2.040 V. Voltage values outside of this range need external resistors. An exception is in0, which is used to monitor the chip's own power source (+3.3V), and is divided internally by a factor 2. The two LSB of the voltage limit registers are not used (always 0), so you can only set the limits in steps of 32 mV (before scaling). The wirings and resistor values suggested by Fintek are as follow: pin expected name use R1 R2 divider raw val. in0 VCC VCC3.3V int. int. 2.00 1.65 V in1 VIN1 VTT1.2V 10K - 1.00 1.20 V in2 VIN2 VRAM 100K 100K 2.00 ~1.25 V (1) in3 VIN3 VCHIPSET 47K 100K 1.47 2.24 V (2) in4 VIN4 VCC5V 200K 47K 5.25 0.95 V in5 VIN5 +12V 200K 20K 11.00 1.05 V in6 VIN6 VCC1.5V 10K - 1.00 1.50 V in7 VIN7 VCORE 10K - 1.00 ~1.40 V (1) in8 VIN8 VSB5V 200K 47K 1.00 0.95 V (1) Depends on your hardware setup. (2) Obviously not correct, swapping R1 and R2 would make more sense. These values can be used as hints at best, as motherboard manufacturers are free to use a completely different setup. As a matter of fact, the Jetway K8M8MS uses a significantly different setup. You will have to find out documentation about your own motherboard, and edit sensors.conf accordingly. Each voltage measured has associated low and high limits, each of which triggers an alarm when crossed. Fan Monitoring -------------- Fan rotation speeds are reported as 12-bit values from a gated clock signal. Speeds down to 366 RPM can be measured. There is no theoretical high limit, but values over 6000 RPM seem to cause problem. The effective resolution is much lower than you would expect, the step between different register values being 10 rather than 1. The chip assumes 2 pulse-per-revolution fans. An alarm is triggered if the rotation speed drops below a programmable limit or is too low to be measured. Temperature Monitoring ---------------------- Temperatures are reported in degrees Celsius. Each temperature measured has a high limit, those crossing triggers an alarm. There is an associated hysteresis value, below which the temperature has to drop before the alarm is cleared. All temperature channels are external, there is no embedded temperature sensor. Each channel can be used for connecting either a thermal diode or a thermistor. The driver reports the currently selected mode, but doesn't allow changing it. In theory, the BIOS should have configured everything properly.