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- 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.
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