diff options
Diffstat (limited to 'Documentation/hwmon/adt7475')
| -rw-r--r-- | Documentation/hwmon/adt7475 | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475 new file mode 100644 index 00000000000..a2b1abec850 --- /dev/null +++ b/Documentation/hwmon/adt7475 @@ -0,0 +1,87 @@ +This describes the interface for the ADT7475 driver: + +(there are 4 fans, numbered fan1 to fan4): + +fanX_input Read the current speed of the fan (in RPMs) +fanX_min Read/write the minimum speed of the fan. Dropping + below this sets an alarm. + +(there are three PWMs, numbered pwm1 to pwm3): + +pwmX Read/write the current duty cycle of the PWM. Writes + only have effect when auto mode is turned off (see + below). Range is 0 - 255. + +pwmX_enable Fan speed control method: + + 0 - No control (fan at full speed) + 1 - Manual fan speed control (using pwm[1-*]) + 2 - Automatic fan speed control + +pwmX_auto_channels_temp Select which channels affect this PWM + + 1 - TEMP1 controls PWM + 2 - TEMP2 controls PWM + 4 - TEMP3 controls PWM + 6 - TEMP2 and TEMP3 control PWM + 7 - All three inputs control PWM + +pwmX_freq Read/write the PWM frequency in Hz. The number + should be one of the following: + + 11 Hz + 14 Hz + 22 Hz + 29 Hz + 35 Hz + 44 Hz + 58 Hz + 88 Hz + +pwmX_auto_point1_pwm Read/write the minimum PWM duty cycle in automatic mode + +pwmX_auto_point2_pwm Read/write the maximum PWM duty cycle in automatic mode + +(there are three temperature settings numbered temp1 to temp3): + +tempX_input Read the current temperature. The value is in milli + degrees of Celsius. + +tempX_max Read/write the upper temperature limit - exceeding this + will cause an alarm. + +tempX_min Read/write the lower temperature limit - exceeding this + will cause an alarm. + +tempX_offset Read/write the temperature adjustment offset + +tempX_crit Read/write the THERM limit for remote1. + +tempX_crit_hyst Set the temperature value below crit where the + fans will stay on - this helps drive the temperature + low enough so it doesn't stay near the edge and + cause THERM to keep tripping. + +tempX_auto_point1_temp Read/write the minimum temperature where the fans will + turn on in automatic mode. + +tempX_auto_point2_temp Read/write the maximum temperature over which the fans + will run in automatic mode. tempX_auto_point1_temp + and tempX_auto_point2_temp together define the + range of automatic control. + +tempX_alarm Read a 1 if the max/min alarm is set +tempX_fault Read a 1 if either temp1 or temp3 diode has a fault + +(There are two voltage settings, in1 and in2): + +inX_input Read the current voltage on VCC. Value is in + millivolts. + +inX_min read/write the minimum voltage limit. + Dropping below this causes an alarm. + +inX_max read/write the maximum voltage limit. + Exceeding this causes an alarm. + +inX_alarm Read a 1 if the max/min alarm is set. |