Kernel driver qnap-mcu-hwmon

This driver enables the use of the hardware monitoring and fan control of the MCU used on some QNAP network attached storage devices.

Author: Heiko Stuebner <heiko@sntech.de>

Description

The driver implements a simple interface for driving the fan controlled by setting its PWM output value and exposes the fan rpm and case-temperature to user space through hwmon’s sysfs interface.

The fan rotation speed returned via the optional ‘fan1_input’ is calculated inside the MCU device.

The driver provides the following sensor accesses in sysfs:

fan1_input	ro	fan tachometer speed in RPM
pwm1	rw	relative speed (0-255), 255=max. speed.
temp1_input	ro	Measured temperature in millicelsius