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181 lines
6.7 KiB
181 lines
6.7 KiB
Kernel driver f71805f |
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===================== |
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Supported chips: |
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* Fintek F71805F/FG |
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Prefix: 'f71805f' |
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Addresses scanned: none, address read from Super I/O config space |
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Datasheet: Available from the Fintek website |
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* Fintek F71806F/FG |
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Prefix: 'f71872f' |
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Addresses scanned: none, address read from Super I/O config space |
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Datasheet: Available from the Fintek website |
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* Fintek F71872F/FG |
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Prefix: 'f71872f' |
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Addresses scanned: none, address read from Super I/O config space |
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Datasheet: Available from the Fintek website |
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Author: Jean Delvare <[email protected]> |
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Thanks to Denis Kieft from Barracuda Networks for the donation of a |
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test system (custom Jetway K8M8MS motherboard, with CPU and RAM) and |
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for providing initial documentation. |
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Thanks to Kris Chen and Aaron Huang from Fintek for answering technical |
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questions and providing additional documentation. |
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Thanks to Chris Lin from Jetway for providing wiring schematics and |
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answering technical questions. |
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Description |
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----------- |
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The Fintek F71805F/FG Super I/O chip includes complete hardware monitoring |
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capabilities. It can monitor up to 9 voltages (counting its own power |
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source), 3 fans and 3 temperature sensors. |
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This chip also has fan controlling features, using either DC or PWM, in |
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three different modes (one manual, two automatic). |
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The Fintek F71872F/FG Super I/O chip is almost the same, with two |
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additional internal voltages monitored (VSB and battery). It also features |
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6 VID inputs. The VID inputs are not yet supported by this driver. |
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The Fintek F71806F/FG Super-I/O chip is essentially the same as the |
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F71872F/FG, and is undistinguishable therefrom. |
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The driver assumes that no more than one chip is present, which seems |
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reasonable. |
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Voltage Monitoring |
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------------------ |
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Voltages are sampled by an 8-bit ADC with a LSB of 8 mV. The supported |
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range is thus from 0 to 2.040 V. Voltage values outside of this range |
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need external resistors. An exception is in0, which is used to monitor |
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the chip's own power source (+3.3V), and is divided internally by a |
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factor 2. For the F71872F/FG, in9 (VSB) and in10 (battery) are also |
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divided internally by a factor 2. |
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The two LSB of the voltage limit registers are not used (always 0), so |
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you can only set the limits in steps of 32 mV (before scaling). |
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The wirings and resistor values suggested by Fintek are as follow: |
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======= ======= =========== ==== ======= ============ ============== |
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in pin expected |
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name use R1 R2 divider raw val. |
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======= ======= =========== ==== ======= ============ ============== |
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in0 VCC VCC3.3V int. int. 2.00 1.65 V |
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in1 VIN1 VTT1.2V 10K - 1.00 1.20 V |
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in2 VIN2 VRAM 100K 100K 2.00 ~1.25 V [1]_ |
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in3 VIN3 VCHIPSET 47K 100K 1.47 2.24 V [2]_ |
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in4 VIN4 VCC5V 200K 47K 5.25 0.95 V |
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in5 VIN5 +12V 200K 20K 11.00 1.05 V |
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in6 VIN6 VCC1.5V 10K - 1.00 1.50 V |
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in7 VIN7 VCORE 10K - 1.00 ~1.40 V [1]_ |
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in8 VIN8 VSB5V 200K 47K 1.00 0.95 V |
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in10 VSB VSB3.3V int. int. 2.00 1.65 V [3]_ |
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in9 VBAT VBATTERY int. int. 2.00 1.50 V [3]_ |
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======= ======= =========== ==== ======= ============ ============== |
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.. [1] Depends on your hardware setup. |
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.. [2] Obviously not correct, swapping R1 and R2 would make more sense. |
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.. [3] F71872F/FG only. |
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These values can be used as hints at best, as motherboard manufacturers |
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are free to use a completely different setup. As a matter of fact, the |
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Jetway K8M8MS uses a significantly different setup. You will have to |
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find out documentation about your own motherboard, and edit sensors.conf |
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accordingly. |
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Each voltage measured has associated low and high limits, each of which |
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triggers an alarm when crossed. |
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Fan Monitoring |
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-------------- |
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Fan rotation speeds are reported as 12-bit values from a gated clock |
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signal. Speeds down to 366 RPM can be measured. There is no theoretical |
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high limit, but values over 6000 RPM seem to cause problem. The effective |
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resolution is much lower than you would expect, the step between different |
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register values being 10 rather than 1. |
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The chip assumes 2 pulse-per-revolution fans. |
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An alarm is triggered if the rotation speed drops below a programmable |
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limit or is too low to be measured. |
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Temperature Monitoring |
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---------------------- |
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Temperatures are reported in degrees Celsius. Each temperature measured |
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has a high limit, those crossing triggers an alarm. There is an associated |
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hysteresis value, below which the temperature has to drop before the |
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alarm is cleared. |
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All temperature channels are external, there is no embedded temperature |
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sensor. Each channel can be used for connecting either a thermal diode |
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or a thermistor. The driver reports the currently selected mode, but |
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doesn't allow changing it. In theory, the BIOS should have configured |
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everything properly. |
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Fan Control |
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----------- |
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Both PWM (pulse-width modulation) and DC fan speed control methods are |
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supported. The right one to use depends on external circuitry on the |
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motherboard, so the driver assumes that the BIOS set the method |
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properly. The driver will report the method, but won't let you change |
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it. |
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When the PWM method is used, you can select the operating frequency, |
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from 187.5 kHz (default) to 31 Hz. The best frequency depends on the |
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fan model. As a rule of thumb, lower frequencies seem to give better |
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control, but may generate annoying high-pitch noise. So a frequency just |
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above the audible range, such as 25 kHz, may be a good choice; if this |
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doesn't give you good linear control, try reducing it. Fintek recommends |
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not going below 1 kHz, as the fan tachometers get confused by lower |
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frequencies as well. |
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When the DC method is used, Fintek recommends not going below 5 V, which |
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corresponds to a pwm value of 106 for the driver. The driver doesn't |
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enforce this limit though. |
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Three different fan control modes are supported; the mode number is written |
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to the pwm<n>_enable file. |
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* 1: Manual mode |
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You ask for a specific PWM duty cycle or DC voltage by writing to the |
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pwm<n> file. |
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* 2: Temperature mode |
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You define 3 temperature/fan speed trip points using the |
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pwm<n>_auto_point<m>_temp and _fan files. These define a staircase |
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relationship between temperature and fan speed with two additional points |
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interpolated between the values that you define. When the temperature |
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is below auto_point1_temp the fan is switched off. |
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* 3: Fan speed mode |
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You ask for a specific fan speed by writing to the fan<n>_target file. |
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Both of the automatic modes require that pwm1 corresponds to fan1, pwm2 to |
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fan2 and pwm3 to fan3. Temperature mode also requires that temp1 corresponds |
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to pwm1 and fan1, etc.
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