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