67 lines
2.1 KiB
ReStructuredText
67 lines
2.1 KiB
ReStructuredText
Kernel driver max31785
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======================
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Supported chips:
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* Maxim MAX31785, MAX31785A
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Prefix: 'max31785' or 'max31785a'
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Addresses scanned: -
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Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf
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Author: Andrew Jeffery <andrew@aj.id.au>
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Description
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-----------
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The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan
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management with temperature and remote voltage sensing. Various fan control
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features are provided, including PWM frequency control, temperature hysteresis,
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dual tachometer measurements, and fan health monitoring.
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For dual-rotor configurations the MAX31785A exposes the second rotor tachometer
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readings in attributes fan[5-8]_input. By contrast the MAX31785 only exposes
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the slowest rotor measurement, and does so in the fan[1-4]_input attributes.
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Usage Notes
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-----------
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This driver does not probe for PMBus devices. You will have to instantiate
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devices explicitly.
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Sysfs attributes
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----------------
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======================= =======================================================
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fan[1-4]_alarm Fan alarm.
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fan[1-4]_fault Fan fault.
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fan[1-8]_input Fan RPM. On the MAX31785A, inputs 5-8 correspond to the
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second rotor of fans 1-4
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fan[1-4]_target Fan input target
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in[1-6]_crit Critical maximum output voltage
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in[1-6]_crit_alarm Output voltage critical high alarm
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in[1-6]_input Measured output voltage
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in[1-6]_label "vout[18-23]"
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in[1-6]_lcrit Critical minimum output voltage
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in[1-6]_lcrit_alarm Output voltage critical low alarm
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in[1-6]_max Maximum output voltage
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in[1-6]_max_alarm Output voltage high alarm
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in[1-6]_min Minimum output voltage
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in[1-6]_min_alarm Output voltage low alarm
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pwm[1-4] Fan target duty cycle (0..255)
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pwm[1-4]_enable 0: Full-speed
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1: Manual PWM control
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2: Automatic PWM (tach-feedback RPM fan-control)
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3: Automatic closed-loop (temp-feedback fan-control)
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temp[1-11]_crit Critical high temperature
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temp[1-11]_crit_alarm Chip temperature critical high alarm
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temp[1-11]_input Measured temperature
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temp[1-11]_max Maximum temperature
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temp[1-11]_max_alarm Chip temperature high alarm
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======================= =======================================================
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