This repository used to contain source code of Linux kernel modules for a PF_LORA socket implementation and multiple chipset drivers.
Today it contains a Makefile for building those modules from an external Linux repository.
It also contains a userspace example program for sending a packet.
To build the kernel modules for a distro kernel (e.g., openSUSE Tumbleweed):
$ git clone https://github.com/afaerber/lora-modules.git $ cd lora-modules $ git clone https://git.kernel.org/pub/scm/linux/kernel/git/afaerber/linux-lora.git -b lora-next
Review the lora-modules.git file include/linux/lora.h, which reuses some existing number for AF_LORA lower than AF_MAX, as well as two free-at-the-time ARPHRD and ETH_P numbers. You may need to change these numbers to avoid conflicts.
$ make
Before you attempt to load any of the modules, always review what they are currently doing! They might have a frequency hardcoded not suited for your region, or might do other unexpected things for testing purposes.
To go ahead and load the modules locally, tainting your kernel:
# ./load.sh
That will insmod the set of drivers, but the chipset drivers won't probe unless you're using a Device Tree Overlay for your board and chipset.
Examples of DT Overlays can be found here: https://github.com/afaerber/dt-overlays
To apply a DT Overlay on the Raspberry Pi, use dtoverlay=foo in
config.txt (extraconfig.txt on openSUSE and SUSE Linux Enterprise Server 15).
To apply a DT Overlay on boards using U-Boot, use the fdt apply command.
On other boards you may have to resort to replacing the whole Device Tree.
Browse the openSUSE HCL Wiki for specific expansion board instructions.
Have a lot of fun!