Merge isaki-audio2 branch, the overhaul of audio subsystem.
- Interrupt-oriented system rather than thread-oriented.
- Improve stability, quality and performance.
- Split playback and record cleanly. Improve halfduplex support.
- Many bugs are fixed including deadlocks, resource leaks, abuses, etc.
- Simplify audio filter mechanism. The encoding/channels/frequency
conversions are completely handled in the upper layer. So the hard-
ware driver only converts its hardware encoding (if necessary).
- audio_hw_if changes:
- Obsoletes query_encoding and add query_format instead.
- Obsoletes set_params and add set_format instead.
- Remove drain, setfd, mappage.
- The call sequences are changed.
- ioctl AUDIO_GETFD/SETFD, AUDIO_GETCHAN/SETCHAN are obsoleted.
- ioctl AUDIO_{QUERY,GET,SET}FORMAT are introduced.
- cleanup config attributes: au*conv and mulaw.
- All hardware drivers should follow it (I've done as much as possible).

Some file paths are changed:
- dev/audio.c -> dev/audio/audio.c (rewritten)
- dev/audiovar.h -> dev/audio/audiovar.h
- dev/audio_dai.h -> dev/audio/audio_dai.h
- dev/audio_if.h -> dev/audio/audio_if.h
- dev/audiobell.c -> dev/audio/audiobell.c
- dev/audiobellvar.h -> dev/audio/audiobellvar.h
- dev/mulaw.[ch] -> dev/audio/mulaw.[ch] + dev/audio/alaw.c

branches: 1.15.22;
KNF. No functional change.

branches: 1.14.12; 1.14.30;
Split device_t/softc of all ad1848 variants properly. Compile test only.

Please check all attribute users in all files.* on device_t/softc split.

XXX: not sure if gus(4) needs device_t in ad1848_isa_softc

fix compile failure.

branches: 1.12.2; 1.12.6;
Drop _HID requirement for attachment under acpi(4). From now on,
drivers attaching to the acpinodebus interface should not assume
that the passed acpi_devnode has a valid _HID.

ok jruoho@

branches: 1.11.2;
Remove <dev/acpi/acpica.h> from all files. It is included from
<dev/acpi/acpivar.h>. Ditto for <dev/sysmon/sysmonvar.h>, <sys/bus.h>,
<dev/pci/pcivar.h>, and <dev/isa/isavar.h>.

Also nuke a lot of unused and invalid headers. Some of these are audibly
provided by standard headers (namely <sys/param.h> and <sys/device.h>), some
have nothing to do with ACPI devices (e.g. <sys/syslog.h>), and some are
nonexistent local includes (e.g. "mpu_ym.h"). Moreoever, try to group the
includes into their respective blocks.

Tested with GENERIC and ALL (i386). No functional change.

branches: 1.10.2;
Adapt for ACPICA API changes.

Switch to ACPICA 20090730, and update for API changes.

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

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

Cut the amount of spam from acpi devices in roughly half by printing
resources on the same line as autoconf messages. Things like:
pcppi1 at acpi0 (SPKR, PNP0800)
pcppi1: io 0x61
become:
pcppi1 at acpi0 (SPKR, PNP0800): io 0x61

branches: 1.5.4; 1.5.12; 1.5.14; 1.5.18; 1.5.22;
use aprint_*_dev and device_xname

branches: 1.4.16;
machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.3.4; 1.3.10; 1.3.24; 1.3.26; 1.3.30;
__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.1.2; 1.1.4; 1.1.6; 1.1.8;
ACPI frontend for Yamaha OPL3-SA[23].
Derived from PR kern/33991 by jasper at pointless dot net.

KNF. No functional change.

branches: 1.14.30;
Split device_t/softc of all ad1848 variants properly. Compile test only.

Please check all attribute users in all files.* on device_t/softc split.

XXX: not sure if gus(4) needs device_t in ad1848_isa_softc

fix compile failure.

branches: 1.12.2; 1.12.6;
Drop _HID requirement for attachment under acpi(4). From now on,
drivers attaching to the acpinodebus interface should not assume
that the passed acpi_devnode has a valid _HID.

ok jruoho@

branches: 1.11.2;
Remove <dev/acpi/acpica.h> from all files. It is included from
<dev/acpi/acpivar.h>. Ditto for <dev/sysmon/sysmonvar.h>, <sys/bus.h>,
<dev/pci/pcivar.h>, and <dev/isa/isavar.h>.

Also nuke a lot of unused and invalid headers. Some of these are audibly
provided by standard headers (namely <sys/param.h> and <sys/device.h>), some
have nothing to do with ACPI devices (e.g. <sys/syslog.h>), and some are
nonexistent local includes (e.g. "mpu_ym.h"). Moreoever, try to group the
includes into their respective blocks.

Tested with GENERIC and ALL (i386). No functional change.

branches: 1.10.2;
Adapt for ACPICA API changes.

Switch to ACPICA 20090730, and update for API changes.

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

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

Cut the amount of spam from acpi devices in roughly half by printing
resources on the same line as autoconf messages. Things like:
pcppi1 at acpi0 (SPKR, PNP0800)
pcppi1: io 0x61
become:
pcppi1 at acpi0 (SPKR, PNP0800): io 0x61

branches: 1.5.4; 1.5.12; 1.5.14; 1.5.18; 1.5.22;
use aprint_*_dev and device_xname

branches: 1.4.16;
machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.3.4; 1.3.10; 1.3.24; 1.3.26; 1.3.30;
__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.1.2; 1.1.4; 1.1.6; 1.1.8;
ACPI frontend for Yamaha OPL3-SA[23].
Derived from PR kern/33991 by jasper at pointless dot net.