0001 Kernel driver max31785
0002 ======================
0003
0004 Supported chips:
0005
0006 * Maxim MAX31785, MAX31785A
0007
0008 Prefix: 'max31785' or 'max31785a'
0009
0010 Addresses scanned: -
0011
0012 Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf
0013
0014 Author: Andrew Jeffery <andrew@aj.id.au>
0015
0016 Description
0017 -----------
0018
0019 The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan
0020 management with temperature and remote voltage sensing. Various fan control
0021 features are provided, including PWM frequency control, temperature hysteresis,
0022 dual tachometer measurements, and fan health monitoring.
0023
0024 For dual-rotor configurations the MAX31785A exposes the second rotor tachometer
0025 readings in attributes fan[5-8]_input. By contrast the MAX31785 only exposes
0026 the slowest rotor measurement, and does so in the fan[1-4]_input attributes.
0027
0028 Usage Notes
0029 -----------
0030
0031 This driver does not probe for PMBus devices. You will have to instantiate
0032 devices explicitly.
0033
0034 Sysfs attributes
0035 ----------------
0036
0037 ======================= =======================================================
0038 fan[1-4]_alarm Fan alarm.
0039 fan[1-4]_fault Fan fault.
0040 fan[1-8]_input Fan RPM. On the MAX31785A, inputs 5-8 correspond to the
0041 second rotor of fans 1-4
0042 fan[1-4]_target Fan input target
0043
0044 in[1-6]_crit Critical maximum output voltage
0045 in[1-6]_crit_alarm Output voltage critical high alarm
0046 in[1-6]_input Measured output voltage
0047 in[1-6]_label "vout[18-23]"
0048 in[1-6]_lcrit Critical minimum output voltage
0049 in[1-6]_lcrit_alarm Output voltage critical low alarm
0050 in[1-6]_max Maximum output voltage
0051 in[1-6]_max_alarm Output voltage high alarm
0052 in[1-6]_min Minimum output voltage
0053 in[1-6]_min_alarm Output voltage low alarm
0054
0055 pwm[1-4] Fan target duty cycle (0..255)
0056 pwm[1-4]_enable 0: Full-speed
0057 1: Manual PWM control
0058 2: Automatic PWM (tach-feedback RPM fan-control)
0059 3: Automatic closed-loop (temp-feedback fan-control)
0060
0061 temp[1-11]_crit Critical high temperature
0062 temp[1-11]_crit_alarm Chip temperature critical high alarm
0063 temp[1-11]_input Measured temperature
0064 temp[1-11]_max Maximum temperature
0065 temp[1-11]_max_alarm Chip temperature high alarm
0066 ======================= =======================================================
