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- Kernel driver max31790
- ======================
- Supported chips:
- * Maxim MAX31790
- Prefix: 'max31790'
- Addresses scanned: -
- Datasheet: https://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf
- Author: Il Han <[email protected]>
- Description
- -----------
- This driver implements support for the Maxim MAX31790 chip.
- The MAX31790 controls the speeds of up to six fans using six independent
- PWM outputs. The desired fan speeds (or PWM duty cycles) are written
- through the I2C interface. The outputs drive "4-wire" fans directly,
- or can be used to modulate the fan's power terminals using an external
- pass transistor.
- Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%)
- monitoring and control of fan RPM as well as detection of fan failure.
- Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
- also be configured to serve as tachometer inputs.
- Sysfs entries
- -------------
- ================== === =======================================================
- fan[1-12]_input RO fan tachometer speed in RPM
- fan[1-12]_fault RO fan experienced fault
- fan[1-6]_target RW desired fan speed in RPM
- fan[1-6]_enable RW enable or disable the tachometer input
- pwm[1-6]_enable RW regulator mode, 0=disabled (duty cycle=0%), 1=manual mode, 2=rpm mode
- pwm[1-6] RW read: current pwm duty cycle,
- write: target pwm duty cycle (0-255)
- ================== === =======================================================
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