hpf1275a(4): Use config_detach_children.

hpf1275a(4): Convert to ttylock/ttyunlock.

Merge thorpej-cfargs2.

Merge thorpej-cfargs branch:

Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass a

Merge thorpej-cfargs branch:

Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass along, just have a single call that
takes a variadic list of tag-value arguments.

Adjust all call sites:
- Simplify wherever possible; don't pass along arguments that aren't
actually needed.
- Don't be explicit about what interface attribute is attaching if
the device only has one. (More simplification.)
- Add a config_probe() function to be used in indirect configuiration
situations, making is visibly easier to see when indirect config is
in play, and allowing for future change in semantics. (As of now,
this is just a wrapper around config_match(), but that is an
implementation detail.)

Remove unnecessary or redundant interface attributes where they're not
needed.

There are currently 5 "cfargs" defined:
- CFARG_SUBMATCH (submatch function for direct config)
- CFARG_SEARCH (search function for indirect config)
- CFARG_IATTR (interface attribte)
- CFARG_LOCATORS (locators array)
- CFARG_DEVHANDLE (devhandle_t - wraps OFW, ACPI, etc. handles)

...and a sentinel value CFARG_EOL.

Add some extra sanity checking to ensure that interface attributes
aren't ambiguous.

Use CFARG_DEVHANDLE in MI FDT, OFW, and ACPI code, and macppc and shark
ports to associate those device handles with device_t instance. This
will trickle trough to more places over time (need back-end for pre-OFW
Sun OBP; any others?).

show more ...

Kill some more extern struct cfdriver declarations.

Down with externs in .c!

Fix the previous fix that doesn't even compile.

fix uninitialized pointer. This could have never worked.
http://m00nbsd.net/ae123a9bae03f7dde5c6d654412daf5a.html

split device_t/softc for all remaining drivers.
replace "struct device *" with "device_t".
use device_xname(), device_unit(), etc.

struct device * -> device_t, no functional changes intended.

struct cfdata * -> cfdata_t, no functional changes intended.

use aprint_*_dev and device_xname

Call ttyflush() with tty_lock held.

after the recent config_attach_pseudo() changes, unit numbers have the same
sementics as for real devices, so DVUNIT_ANY=-1 is illegal

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

__unused removal on arguments; approved by core.

Nuke GPROF cargo-cult I've been cut-n-pasting around in my drivers.

-Wextra fixes

More from Matt Fleming:

Adapt to KAUTH_DEVICE_TTY_PRIVSET and KAUTH_DEVICE_TTY_OPEN.

- Use the LWP cached credentials where sane.
- Minor cosmetic changes.

If tty that we open already has hpf1275a line discipline set, don't
spawn new pseudo-device and wskbd instances.

XXX: The logic for exclusive use needs to be thought out better, but
for now this sho

If tty that we open already has hpf1275a line discipline set, don't
spawn new pseudo-device and wskbd instances.

XXX: The logic for exclusive use needs to be thought out better, but
for now this should at least prevent scores of new hpf1275a/wskbd
being attached if you accidentally set this line discipline on your
serial console.

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Miscellaneous cosmetics.

Propagate "static" to linesw method defintions.

Constify hpf1275a_wskbd_keymapdata.

#include <dev/wscons/wsksymvar.h> as gcc4 doesn't like arrays,
pckbd_keydesctab[] in this case, with incomplete element types (older
versions of gcc allow them as long as you don't try to access them

#include <dev/wscons/wsksymvar.h> as gcc4 doesn't like arrays,
pckbd_keydesctab[] in this case, with incomplete element types (older
versions of gcc allow them as long as you don't try to access them).

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- include kauth.h for kauth_authorize_generic.
- whitespace.