diff options
Diffstat (limited to 'Documentation/hwmon/max31790.rst')
| -rw-r--r-- | Documentation/hwmon/max31790.rst | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst new file mode 100644 index 0000000000..33c5c7330e --- /dev/null +++ b/Documentation/hwmon/max31790.rst @@ -0,0 +1,45 @@ +Kernel driver max31790 +====================== + +Supported chips: + + * Maxim MAX31790 + + Prefix: 'max31790' + + Addresses scanned: - + + Datasheet: https://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf + +Author: Il Han <corone.il.han@gmail.com> + + +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) +================== === ======================================================= |