lpt module

[Eric Jacobs]

On Sat, 12 Jun 2004 18:46:17 +0200
sebastian ssmoller <sebastian.ssmoller at gmx.net> wrote:

> 
> so i decided to play around a bit with the lpt module. first thing i
> noticed when compiled lpt as module is: i cannot unload it (kldunload
> says: device not configured). somewhere in the  net i read that this is
> an expected behaviour (as it is for usb afaik) because lpt module does
> not release memory properly (?)

The lpt driver needs a device_detach method in sys/ppbus/lpt.c.
Might want to look at sio_detach in sio for hints. It will need
to ensure that the device is closed, release bus resources, and
destroy its cdevs, and possibly some other non-obvious things
(haven't looked closely)