diff options
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r-- | Documentation/hwmon/f71805f | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/Documentation/hwmon/f71805f b/Documentation/hwmon/f71805f index bfd0f154959c..94e0d2cbd3d2 100644 --- a/Documentation/hwmon/f71805f +++ b/Documentation/hwmon/f71805f | |||
@@ -5,11 +5,11 @@ Supported chips: | |||
5 | * Fintek F71805F/FG | 5 | * Fintek F71805F/FG |
6 | Prefix: 'f71805f' | 6 | Prefix: 'f71805f' |
7 | Addresses scanned: none, address read from Super I/O config space | 7 | Addresses scanned: none, address read from Super I/O config space |
8 | Datasheet: Provided by Fintek on request | 8 | Datasheet: Available from the Fintek website |
9 | * Fintek F71872F/FG | 9 | * Fintek F71872F/FG |
10 | Prefix: 'f71872f' | 10 | Prefix: 'f71872f' |
11 | Addresses scanned: none, address read from Super I/O config space | 11 | Addresses scanned: none, address read from Super I/O config space |
12 | Datasheet: Provided by Fintek on request | 12 | Datasheet: Available from the Fintek website |
13 | 13 | ||
14 | Author: Jean Delvare <khali@linux-fr.org> | 14 | Author: Jean Delvare <khali@linux-fr.org> |
15 | 15 | ||
@@ -128,7 +128,9 @@ it. | |||
128 | When the PWM method is used, you can select the operating frequency, | 128 | When the PWM method is used, you can select the operating frequency, |
129 | from 187.5 kHz (default) to 31 Hz. The best frequency depends on the | 129 | from 187.5 kHz (default) to 31 Hz. The best frequency depends on the |
130 | fan model. As a rule of thumb, lower frequencies seem to give better | 130 | fan model. As a rule of thumb, lower frequencies seem to give better |
131 | control, but may generate annoying high-pitch noise. Fintek recommends | 131 | control, but may generate annoying high-pitch noise. So a frequency just |
132 | above the audible range, such as 25 kHz, may be a good choice; if this | ||
133 | doesn't give you good linear control, try reducing it. Fintek recommends | ||
132 | not going below 1 kHz, as the fan tachometers get confused by lower | 134 | not going below 1 kHz, as the fan tachometers get confused by lower |
133 | frequencies as well. | 135 | frequencies as well. |
134 | 136 | ||
@@ -136,16 +138,23 @@ When the DC method is used, Fintek recommends not going below 5 V, which | |||
136 | corresponds to a pwm value of 106 for the driver. The driver doesn't | 138 | corresponds to a pwm value of 106 for the driver. The driver doesn't |
137 | enforce this limit though. | 139 | enforce this limit though. |
138 | 140 | ||
139 | Three different fan control modes are supported: | 141 | Three different fan control modes are supported; the mode number is written |
142 | to the pwm<n>_enable file. | ||
140 | 143 | ||
141 | * Manual mode | 144 | * 1: Manual mode |
142 | You ask for a specific PWM duty cycle or DC voltage. | 145 | You ask for a specific PWM duty cycle or DC voltage by writing to the |
146 | pwm<n> file. | ||
143 | 147 | ||
144 | * Fan speed mode | 148 | * 2: Temperature mode |
145 | You ask for a specific fan speed. This mode assumes that pwm1 | 149 | You define 3 temperature/fan speed trip points using the |
146 | corresponds to fan1, pwm2 to fan2 and pwm3 to fan3. | 150 | pwm<n>_auto_point<m>_temp and _fan files. These define a staircase |
151 | relationship between temperature and fan speed with two additional points | ||
152 | interpolated between the values that you define. When the temperature | ||
153 | is below auto_point1_temp the fan is switched off. | ||
147 | 154 | ||
148 | * Temperature mode | 155 | * 3: Fan speed mode |
149 | You define 3 temperature/fan speed trip points, and the fan speed is | 156 | You ask for a specific fan speed by writing to the fan<n>_target file. |
150 | adjusted depending on the measured temperature, using interpolation. | 157 | |
151 | This mode is not yet supported by the driver. | 158 | Both of the automatic modes require that pwm1 corresponds to fan1, pwm2 to |
159 | fan2 and pwm3 to fan3. Temperature mode also requires that temp1 corresponds | ||
160 | to pwm1 and fan1, etc. | ||