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The MCU can be found on network-attached-storage devices made by QNAP and provides access to fan control including reading back its RPM as well as reading the temperature of the NAS case. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20241107114712.538976-8-heiko@sntech.de Signed-off-by: Lee Jones <lee@kernel.org>
27 lines
968 B
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27 lines
968 B
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.. SPDX-License-Identifier: GPL-2.0-or-later
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Kernel driver qnap-mcu-hwmon
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============================
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This driver enables the use of the hardware monitoring and fan control
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of the MCU used on some QNAP network attached storage devices.
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Author: Heiko Stuebner <heiko@sntech.de>
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Description
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-----------
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The driver implements a simple interface for driving the fan controlled by
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setting its PWM output value and exposes the fan rpm and case-temperature
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to user space through hwmon's sysfs interface.
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The fan rotation speed returned via the optional 'fan1_input' is calculated
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inside the MCU device.
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The driver provides the following sensor accesses in sysfs:
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=============== ======= =======================================================
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fan1_input ro fan tachometer speed in RPM
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pwm1 rw relative speed (0-255), 255=max. speed.
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temp1_input ro Measured temperature in millicelsius
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=============== ======= =======================================================
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