per-device sysctls

[M. Warner Losh]

In message: <xzpk729lnq7.fsf at dwp.des.no>
            des at des.no (Dag-Erling Smørgrav) writes:
: I also plan to add entries for device IDs, irq /
: drq lines etc., but this will require additional bus-specific code and
: is not yet implemented.

You don't need bus specific code for any of these things, per se.
There's already two routines that busses can (and mostly do)
implement.  The irq/drq/resource stuff is already recorded elsewhere
and can be dug out, just like devinfo does.  The existing interface to
get location and pnpinfo from the bus are:

#
# Returns the pnp info for this device.  Return it as a string.  If the
# string is insufficient for the storage, then return EOVERFLOW.
#
METHOD int child_pnpinfo_str {
	device_t	_dev;
	device_t	_child;
	char		*_buf;
	size_t		_buflen;
};

#
# Returns the location for this device.  Return it as a string.  If the
# string is insufficient for the storage, then return EOVERFLOW.
#
METHOD int child_location_str {
	device_t	_dev;
	device_t	_child;
	char		*_buf;
	size_t		_buflen;
};

Warner