diff options
Diffstat (limited to 'Documentation/hwmon/f71805f')
| -rw-r--r-- | Documentation/hwmon/f71805f | 56 |
1 files changed, 51 insertions, 5 deletions
diff --git a/Documentation/hwmon/f71805f b/Documentation/hwmon/f71805f index 2ca69df669c3..bfd0f154959c 100644 --- a/Documentation/hwmon/f71805f +++ b/Documentation/hwmon/f71805f @@ -6,6 +6,10 @@ Supported chips: Prefix: 'f71805f' Addresses scanned: none, address read from Super I/O config space Datasheet: Provided by Fintek on request + * Fintek F71872F/FG + Prefix: 'f71872f' + Addresses scanned: none, address read from Super I/O config space + Datasheet: Provided by Fintek on request Author: Jean Delvare <khali@linux-fr.org> @@ -13,8 +17,8 @@ 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 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. @@ -28,8 +32,11 @@ 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. +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 driver assumes that no more than one chip is present, which seems reasonable. @@ -42,7 +49,8 @@ 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. +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). @@ -61,9 +69,12 @@ 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 @@ -103,3 +114,38 @@ 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. 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: + +* Manual mode + You ask for a specific PWM duty cycle or DC voltage. + +* Fan speed mode + You ask for a specific fan speed. This mode assumes that pwm1 + corresponds to fan1, pwm2 to fan2 and pwm3 to fan3. + +* Temperature mode + You define 3 temperature/fan speed trip points, and the fan speed is + adjusted depending on the measured temperature, using interpolation. + This mode is not yet supported by the driver. |