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