Also it should be trivial to run this as an out-of-tree module until it's merged. With DKMS or put hid_bl.c into an empty directory and add the following makefile:

``` ifneq ($(KERNELRELEASE),) # kbuild part of makefile obj-m := hid_bl.o

else # normal makefile KDIR ?= /lib/modules/`uname -r`/build

modules:

%: $(MAKE) -C $(KDIR) M=$$PWD $@

endif ```