1Kernel driver max31790 2====================== 3 4Supported chips: 5 6 * Maxim MAX31790 7 8 Prefix: 'max31790' 9 10 Addresses scanned: - 11 12 Datasheet: https://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf 13 14Author: Il Han <corone.il.han@gmail.com> 15 16 17Description 18----------- 19 20This driver implements support for the Maxim MAX31790 chip. 21 22The MAX31790 controls the speeds of up to six fans using six independent 23PWM outputs. The desired fan speeds (or PWM duty cycles) are written 24through the I2C interface. The outputs drive "4-wire" fans directly, 25or can be used to modulate the fan's power terminals using an external 26pass transistor. 27 28Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%) 29monitoring and control of fan RPM as well as detection of fan failure. 30Six pins are dedicated tachometer inputs. Any of the six PWM outputs can 31also be configured to serve as tachometer inputs. 32 33 34Sysfs entries 35------------- 36 37================== === ======================================================= 38fan[1-12]_input RO fan tachometer speed in RPM 39fan[1-12]_fault RO fan experienced fault 40fan[1-6]_target RW desired fan speed in RPM 41fan[1-6]_enable RW enable or disable the tachometer input 42pwm[1-6]_enable RW regulator mode, 0=disabled (duty cycle=0%), 1=manual mode, 2=rpm mode 43pwm[1-6] RW read: current pwm duty cycle, 44 write: target pwm duty cycle (0-255) 45================== === ======================================================= 46