Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Merge ACPICA 20100121.

Import ACPICA 20090521.

device_shutdown returns int.

Initialize key to zero.

Mute the main audio during reboot/shutdown. This prevents a burst of static
on the speakers of my Panasonic Y4. It might make sense to do this in the
mixer rc.d script as well.

Use the acpi_event_sleep_button_sleep() function instead of
the acpi_SetSleepState().

Submitted by: njl

Add Fn+F7 hotkey (suspend) support.

Tested by: nork

Canonize the include of acpi.h.

Fix my copyright.

Unify ACPI_DEBUG support for all OEM drivers under ACPI_OEM. Since more than
one will never be supported on the same platform, this does not hurt
debugging.

MFC after: 3 days

After discussions with Nate, repo copy the acpi assist drivers from
i386 to dev/acpi_support. In theory, these devices could be found
other than in i386 machines only as amd64 becomes more popular. These
drivers don't appear to do anything i386 specific, so move them to
dev/acpi_support. Move config lines to files so that those
architectures that don't support kernel modules can build them into
the kernel. At the same time, rename acpi_snc to acpi_sony to follow
the lead of all the other specialty devices.

Add power profile support so that the LCD changes brightness levels based
on the AC line state.

Submitted by: OGAWA Takaya <t-ogawa@triaez.kaisei.org>
MFC after: 1 week

Be sure to always unlock the sx lock when exiting the sysctl function.

MFC after: 3 days

MPSAFE locking

* Serialize access to the sysctl routines and the notify handler
* Assert that the sx lock is held in any functions they call.

Whitespace cleanup and move static variables together.

Add the ACPI Panasonic extras driver.

Submitted by: OGAWA Takaya <t-ogawa@triaez.kaisei.org> and nyan