Commit 9855caf5 authored by Heiko Stuebner's avatar Heiko Stuebner Committed by Lee Jones
Browse files

hwmon: add driver for the hwmon parts of qnap-mcu devices 



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: default avatarHeiko Stuebner <heiko@sntech.de>
Acked-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20241107114712.538976-8-heiko@sntech.de


Signed-off-by: default avatarLee Jones <lee@kernel.org>
parent bb7e3611

Documentation/hwmon/index.rst

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@@ -201,6 +201,7 @@ Hardware Monitoring Kernel Drivers 
   pxe1610

   pwm-fan

   q54sj108a2

   qnap-mcu-hwmon

   raspberrypi-hwmon

   sbrmi

   sbtsi_temp

Documentation/hwmon/qnap-mcu-hwmon.rst

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.. SPDX-License-Identifier: GPL-2.0-or-later



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

=============== ======= =======================================================

MAINTAINERS

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@@ -19108,6 +19108,7 @@ F: drivers/media/tuners/qm1d1c0042* 
QNAP MCU DRIVER

M:	Heiko Stuebner <heiko@sntech.de>

S:	Maintained

F:	drivers/hwmon/qnap-mcu-hwmon.c

F:	drivers/input/misc/qnap-mcu-input.c

F:	drivers/leds/leds-qnap-mcu.c

F:	drivers/mfd/qnap-mcu.c

drivers/hwmon/Kconfig

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@@ -1822,6 +1822,18 @@ config SENSORS_PWM_FAN 
	  This driver can also be built as a module. If so, the module

	  will be called pwm-fan.



config SENSORS_QNAP_MCU_HWMON

	tristate "QNAP MCU hardware monitoring"

	depends on MFD_QNAP_MCU

	depends on THERMAL || THERMAL=n

	help

	  Say yes here to enable support for fan and temperature sensor

	  connected to a QNAP MCU, as found in a number of QNAP network

	  attached storage devices.



	  This driver can also be built as a module. If so, the module

	  will be called qnap-mcu-hwmon.



config SENSORS_RASPBERRYPI_HWMON

	tristate "Raspberry Pi voltage monitor"

	depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)

drivers/hwmon/Makefile

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@@ -189,6 +189,7 @@ obj-$(CONFIG_SENSORS_POWERZ) += powerz.o 
obj-$(CONFIG_SENSORS_POWR1220)  += powr1220.o

obj-$(CONFIG_SENSORS_PT5161L)	+= pt5161l.o

obj-$(CONFIG_SENSORS_PWM_FAN)	+= pwm-fan.o

obj-$(CONFIG_SENSORS_QNAP_MCU_HWMON)	+= qnap-mcu-hwmon.o

obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON)	+= raspberrypi-hwmon.o

obj-$(CONFIG_SENSORS_SBTSI)	+= sbtsi_temp.o

obj-$(CONFIG_SENSORS_SBRMI)	+= sbrmi.o