diff options
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r-- | Documentation/hwmon/it87 | 10 | ||||
-rw-r--r-- | Documentation/hwmon/sysfs-interface | 15 |
2 files changed, 20 insertions, 5 deletions
diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87 index 74a80992d237..c0528d6f9ace 100644 --- a/Documentation/hwmon/it87 +++ b/Documentation/hwmon/it87 | |||
@@ -135,6 +135,16 @@ Give 0 for unused sensor. Any other value is invalid. To configure this at | |||
135 | startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor; | 135 | startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor; |
136 | 3 = thermal diode) | 136 | 3 = thermal diode) |
137 | 137 | ||
138 | |||
139 | Fan speed control | ||
140 | ----------------- | ||
141 | |||
138 | The fan speed control features are limited to manual PWM mode. Automatic | 142 | The fan speed control features are limited to manual PWM mode. Automatic |
139 | "Smart Guardian" mode control handling is not implemented. However | 143 | "Smart Guardian" mode control handling is not implemented. However |
140 | if you want to go for "manual mode" just write 1 to pwmN_enable. | 144 | if you want to go for "manual mode" just write 1 to pwmN_enable. |
145 | |||
146 | If you are only able to control the fan speed with very small PWM values, | ||
147 | try lowering the PWM base frequency (pwm1_freq). Depending on the fan, | ||
148 | it may give you a somewhat greater control range. The same frequency is | ||
149 | used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are | ||
150 | read-only. | ||
diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface index efef3b962cd3..d73d2e8c7534 100644 --- a/Documentation/hwmon/sysfs-interface +++ b/Documentation/hwmon/sysfs-interface | |||
@@ -166,16 +166,21 @@ pwm[1-*] Pulse width modulation fan control. | |||
166 | 166 | ||
167 | pwm[1-*]_enable | 167 | pwm[1-*]_enable |
168 | Switch PWM on and off. | 168 | Switch PWM on and off. |
169 | Not always present even if fan*_pwm is. | 169 | Not always present even if pwmN is. |
170 | 0: turn off | 170 | 0: turn off |
171 | 1: turn on in manual mode | 171 | 1: turn on in manual mode |
172 | 2+: turn on in automatic mode | 172 | 2+: turn on in automatic mode |
173 | Check individual chip documentation files for automatic mode details. | 173 | Check individual chip documentation files for automatic mode |
174 | details. | ||
174 | RW | 175 | RW |
175 | 176 | ||
176 | pwm[1-*]_mode | 177 | pwm[1-*]_mode 0: DC mode (direct current) |
177 | 0: DC mode | 178 | 1: PWM mode (pulse-width modulation) |
178 | 1: PWM mode | 179 | RW |
180 | |||
181 | pwm[1-*]_freq Base PWM frequency in Hz. | ||
182 | Only possibly available when pwmN_mode is PWM, but not always | ||
183 | present even then. | ||
179 | RW | 184 | RW |
180 | 185 | ||
181 | pwm[1-*]_auto_channels_temp | 186 | pwm[1-*]_auto_channels_temp |