diff options
Diffstat (limited to 'Documentation/hwmon/f71805f')
| -rw-r--r-- | Documentation/hwmon/f71805f | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/Documentation/hwmon/f71805f b/Documentation/hwmon/f71805f deleted file mode 100644 index 48a356084bc6..000000000000 --- a/Documentation/hwmon/f71805f +++ /dev/null @@ -1,167 +0,0 @@ -Kernel driver f71805f -===================== - -Supported chips: - * Fintek F71805F/FG - Prefix: 'f71805f' - Addresses scanned: none, address read from Super I/O config space - Datasheet: Available from the Fintek website - * Fintek F71806F/FG - Prefix: 'f71872f' - Addresses scanned: none, address read from Super I/O config space - Datasheet: Available from the Fintek website - * Fintek F71872F/FG - Prefix: 'f71872f' - Addresses scanned: none, address read from Super I/O config space - Datasheet: Available from the Fintek website - -Author: Jean Delvare <jdelvare@suse.de> - -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 and Aaron Huang 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 Fintek F71872F/FG Super I/O chip is almost the same, with two -additional internal voltages monitored (VSB and battery). It also features -6 VID inputs. The VID inputs are not yet supported by this driver. - -The Fintek F71806F/FG Super-I/O chip is essentially the same as the -F71872F/FG, and is undistinguishable therefrom. - -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. For the F71872F/FG, in9 (VSB) and in10 (battery) are also -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 -in10 VSB VSB3.3V int. int. 2.00 1.65 V (3) -in9 VBAT VBATTERY int. int. 2.00 1.50 V (3) - -(1) Depends on your hardware setup. -(2) Obviously not correct, swapping R1 and R2 would make more sense. -(3) F71872F/FG only. - -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. - - -Fan Control ------------ - -Both PWM (pulse-width modulation) and DC fan speed control methods are -supported. The right one to use depends on external circuitry on the -motherboard, so the driver assumes that the BIOS set the method -properly. The driver will report the method, but won't let you change -it. - -When the PWM method is used, you can select the operating frequency, -from 187.5 kHz (default) to 31 Hz. The best frequency depends on the -fan model. As a rule of thumb, lower frequencies seem to give better -control, but may generate annoying high-pitch noise. So a frequency just -above the audible range, such as 25 kHz, may be a good choice; if this -doesn't give you good linear control, try reducing it. Fintek recommends -not going below 1 kHz, as the fan tachometers get confused by lower -frequencies as well. - -When the DC method is used, Fintek recommends not going below 5 V, which -corresponds to a pwm value of 106 for the driver. The driver doesn't -enforce this limit though. - -Three different fan control modes are supported; the mode number is written -to the pwm<n>_enable file. - -* 1: Manual mode - You ask for a specific PWM duty cycle or DC voltage by writing to the - pwm<n> file. - -* 2: Temperature mode - You define 3 temperature/fan speed trip points using the - pwm<n>_auto_point<m>_temp and _fan files. These define a staircase - relationship between temperature and fan speed with two additional points - interpolated between the values that you define. When the temperature - is below auto_point1_temp the fan is switched off. - -* 3: Fan speed mode - You ask for a specific fan speed by writing to the fan<n>_target file. - -Both of the automatic modes require that pwm1 corresponds to fan1, pwm2 to -fan2 and pwm3 to fan3. Temperature mode also requires that temp1 corresponds -to pwm1 and fan1, etc. |