Add sources

.gitignore

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+.Module.symvers.cmd
+.modules.order.cmd
+.nct6687.ko.cmd
+.nct6687.mod.cmd
+.nct6687.mod.o.cmd
+.nct6687.o.cmd
+linux-headers
+Module.symvers
+modules.order
+nct6687.ko
+nct6687.mod
+nct6687.mod.c
+nct6687.mod.o
+nct6687.o
+.vscode/

Makefile

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+obj-m += nct6687.o
+
+all:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+install: all
+	sudo cp nct6687.ko /lib/modules/$(shell uname -r)/kernel/drivers/hwmon/
+	sudo depmod
+	sudo modprobe nct6687
+
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

README.md

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+# README
+
+## NCT6687D Kernel module
+
+This kernel module permit to recognize the chipset Nuvoton NCT6687-R in lm-sensors package.
+This sensor is present on some B550 motherboard such as MSI or ASUS.
+
+The implementation is minimalist and was done by reverse coding of Windows 10 source code from [LibreHardwareMonitor](https://github.com/LibreHardwareMonitor/LibreHardwareMonitor)
+
+## Installation
+
+To install this module, you need a buid environment. Exemple for Ubuntu
+
+```shell
+apt-get install build-essential linux-headers-`uname -r`
+```
+
+Clone this repository and go to source directory, just run make install. During install, you could be asked for your password because some commands are sudoed.
+
+```shell
+make install
+```
+
+## Sensors
+
+By running the command sensors, you got this output
+
+```
+nct6687-isa-0a20
+Adapter: ISA adapter
+fan1:        1200 RPM
+fan2:        1426 RPM
+fan3:         918 RPM
+fan4:         930 RPM
+fan5:        1371 RPM
+fan7:         967 RPM
+CPU:          +49.0°C  
+System:       +34.0°C  
+VRM MOS:      +30.0°C  
+PCH:          +40.0°C  
+CPU Socket:   +33.0°C  
+PCIe x1:      +32.0°C  
+M2_1:          +0.0°C  
+```
+
+## Tested
+
+This module was tested on Ubuntu 20.04 with [Linux Kernel 5.8.18-050818-generic](https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8.18/) on motherboard [MAG-B550-TOMAHAWK](https://www.msi.com//Motherboard/MAG-B550-TOMAHAWK) running an [AMD 3900X](https://www.amd.com/en/products/cpu/amd-ryzen-9-3900x)
+
+## TODO
+
+**1. Fan speed control**
+
+- Changing fan speed and restore to default value not tested.
+- Becareful probably fan speed will down to 0 RPM