How to publish a device driver?

No in that case the code needs to be compiled each time so you need to provide it.

It you really have some parts of your driver you don't want to share, you can always try and split it in two. The first part is the low-level driver that directly talks to the hardware, using the constants defined in the bsp, distributed as source code. The second part is the higher level "intelligent" part, that you can distribute as a binary library. Of course it depends on the kind of hardware you have and which part of the driver you need to protect.