X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=Documentation%2Fhwmon%2Ff71805f;h=f0d55976740adfeabfb7258d4109a7d4c930c6ac;hb=e14f64c2079240082f3c5bf98d9ecf3dc6780338;hp=bfd0f154959cce0e3398e899e7b5a0619f2abcce;hpb=b361735043e3001eadb1d40916fd1a4fca1a9363;p=karo-tx-linux.git diff --git a/Documentation/hwmon/f71805f b/Documentation/hwmon/f71805f index bfd0f154959c..f0d55976740a 100644 --- a/Documentation/hwmon/f71805f +++ b/Documentation/hwmon/f71805f @@ -5,11 +5,15 @@ Supported chips: * Fintek F71805F/FG Prefix: 'f71805f' Addresses scanned: none, address read from Super I/O config space - Datasheet: Provided by Fintek on request + 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: Provided by Fintek on request + Datasheet: Available from the Fintek website Author: Jean Delvare @@ -38,6 +42,9 @@ 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. @@ -128,7 +135,9 @@ 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 +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. @@ -136,16 +145,23 @@ 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: +Three different fan control modes are supported; the mode number is written +to the pwm_enable file. + +* 1: Manual mode + You ask for a specific PWM duty cycle or DC voltage by writing to the + pwm file. -* Manual mode - You ask for a specific PWM duty cycle or DC voltage. +* 2: Temperature mode + You define 3 temperature/fan speed trip points using the + pwm_auto_point_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. -* 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. +* 3: Fan speed mode + You ask for a specific fan speed by writing to the fan_target file. -* 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. +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.