8 Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf
10 Author: Il Han <corone.il.han@gmail.com>
16 This driver implements support for the Maxim MAX31790 chip.
18 The MAX31790 controls the speeds of up to six fans using six independent
19 PWM outputs. The desired fan speeds (or PWM duty cycles) are written
20 through the I2C interface. The outputs drive "4-wire" fans directly,
21 or can be used to modulate the fan's power terminals using an external
24 Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%)
25 monitoring and control of fan RPM as well as detection of fan failure.
26 Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
27 also be configured to serve as tachometer inputs.
33 fan[1-12]_input RO fan tachometer speed in RPM
34 fan[1-12]_fault RO fan experienced fault
35 fan[1-6]_target RW desired fan speed in RPM
36 pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
37 pwm[1-6] RW fan target duty cycle (0-255)