Lennart Augustsson <lennart@augustsson.net> writes:

> Something like usbd is doubtlessly needed.  It would be
> nice if it could be common for all hot pluggable devices.

The recently-introduced /dev/drvctl seems to be a good place to
communicate driver attach/detach messages from the kernel to
userland. We have attach and detach sufficently centralized that it
shouldn't be hard to cause a message to be generated for a listener
there.

        - Nathan