Make audio(9) get_props() optional, remove it from duplex drivers

The property bits of audio(9) are obsolete and ought to be removed
completely.

sys/dev/audio.c:audio_open() currently uses get_props() to bail out if
read *and* write was requested on a non-duplex driver.

Drivers that currently support playing but not recording need adjustment
before the API can be cleaned up.

Drivers that advertise themselves as full duplex, i.e. those that always
return AUDIO_PROP_FULLDUPLEX unconditionally in their get_props() currently
always succeed this check.

As this is the only property, losen audio_open()'s DIAGNOSTIC check and only
do the duplex check if the driver provides get_props().

This allows for simple removal of get_props() from full-duplex drivers
without adding any other code or without changing functionality.

This includes all audio drivers under sys/dev/pci/ (maestro(4) being the
only unfinished exception here).

Other drivers as well as the API change can then follow in smaller diffs.

This builds on amd64, arm64, i386, macppc and sparc64.
amd64 with azalia(4) still plays, records as well as plays and records
at the same time on my X230 as tested with

$ aucat -i play.wav [-o rec.wav]

alpha and hppa tests by miod
OK ratchov miod

Use C99 struct init for struct audio_hw_if

This audio(9) struct will lose a member, but drivers init their struct quite
inconsistently, most pre-C99 style.

Use C99 style everywhere, to get rid of all annoying differences and allow
for easy member removals/additions:
- don't change current order of members
- no explicit NULL members
- no comments or blank lines
- trailing comma in last member line

GENERIC.MP builds fine with this on arm64, amd64, i386 and sparc64.

macppc and alpha build-tested by miod
OK ratchov miod

Remove unused AUDIO_PROP_{MMAP,INDEPENDENT}

AUDIO_PROP_FULLDUPLEX is the only audio(9) in use, the other two died with
commit 1cf2860827c8ca659d8097d8da94a5ae5b888c53
Author: ratchov <ratchov@openbsd.org>
Date: Thu Jun 25 06:43:45 2015 +0000

Reimplement the audio driver in a simpler way, removing unused/unusable
functionality. Same API and ABI except for the removed bits and no
behaviour change for programs using libsndio. With help from armani@
and mpi@, thanks.

but remained defined and set in drivers.

and the following merely moved them when they were dead code already:

commit 9215aa3dfad387bca877a805534df6dcfe8722eb
Author: ratchov <ratchov@openbsd.org>
Date: Wed Aug 31 07:22:43 2016 +0000

Delete unused ioctls and associated macros. Move macros that are still
used internally by low-level drivers from sys/audioio.h to
dev/audio_if.h instead of deleting them.

None of this is used in base or ports; codesearch.debian.net only shows
AUDIO_PROP_{CAPTURE,PLAYBACK} in firefox-esr, mozjs and cubeb.

ratchov points out that audio_if.h and audioio.h are private interfaces
and the codesearch shows SunOS and NetBSD bits (#ifdef'd out on OpenBSD).

OK ratchov

Constify struct {audio,midi,radio,video}_hw_if. No functional change.

ok mpi@ ratchov@ "More const is good" deraadt@

Make room for a cookie argument passed to audio_attach_mi(). Currently
unused but intended to be used to correlate audio and wskbd devices.

ok ratchov@

Remove unused getdev() audio driver functions.

Remove drain(), query_encoding(), mappage() and get_default_params()
methods from all audio drivers and from the audio_if structure as they
are never called.

Remove all audio format conversion code from the kernel (btw holding
the kernel_lock), as we already do better conversions in
user-mode. Yet, no need for every single driver to fiddle with the
conversion code as they are done transparently by common MI code. With
help from armani and miod, support from mpi

ok armani@

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

Introduce a global interrupt-aware mutex protecting data
structures (including sound-card registers) from concurent
access by syscall and interrupt code-paths. Since critical
sections remain the same, calls to splraise/spllower can be
safely replaced by calls to mtx_enter/mtx_leave with two
exceptions: (1) mutexes are not reentrant (the inner splraise
is thus removed), and (2) we're not allowed to sleep with a
mutex (either msleep is used or the mutex is released before
sleeping).

ok and help from kettenis, a lot of work from armani

No need to check for the size to be a multiple of 4 in the alpha-specific
code to process four samples at a time - we can do as much sets of 4 as possible
before falling back to the remainder processed one byte at a time.

Driver for the TURBOchannel alpha baseboard audio. Ported from NetBSD, with
changes to allow using non-native encodings, and alpha specific code to try
and avoid doing 8 bit memory access.
Tested on 3000/300LX, deaf testing on 3000/600.

Use C99 struct init for struct audio_hw_if

This audio(9) struct will lose a member, but drivers init their struct quite
inconsistently, most pre-C99 style.

Use C99 style everywhere, to get rid of all annoying differences and allow
for easy member removals/additions:
- don't change current order of members
- no explicit NULL members
- no comments or blank lines
- trailing comma in last member line

GENERIC.MP builds fine with this on arm64, amd64, i386 and sparc64.

macppc and alpha build-tested by miod
OK ratchov miod

Remove unused AUDIO_PROP_{MMAP,INDEPENDENT}

AUDIO_PROP_FULLDUPLEX is the only audio(9) in use, the other two died with
commit 1cf2860827c8ca659d8097d8da94a5ae5b888c53
Author: ratchov <ratchov@openbsd.org>
Date: Thu Jun 25 06:43:45 2015 +0000

Reimplement the audio driver in a simpler way, removing unused/unusable
functionality. Same API and ABI except for the removed bits and no
behaviour change for programs using libsndio. With help from armani@
and mpi@, thanks.

but remained defined and set in drivers.

and the following merely moved them when they were dead code already:

commit 9215aa3dfad387bca877a805534df6dcfe8722eb
Author: ratchov <ratchov@openbsd.org>
Date: Wed Aug 31 07:22:43 2016 +0000

Delete unused ioctls and associated macros. Move macros that are still
used internally by low-level drivers from sys/audioio.h to
dev/audio_if.h instead of deleting them.

None of this is used in base or ports; codesearch.debian.net only shows
AUDIO_PROP_{CAPTURE,PLAYBACK} in firefox-esr, mozjs and cubeb.

ratchov points out that audio_if.h and audioio.h are private interfaces
and the codesearch shows SunOS and NetBSD bits (#ifdef'd out on OpenBSD).

OK ratchov

Constify struct {audio,midi,radio,video}_hw_if. No functional change.

ok mpi@ ratchov@ "More const is good" deraadt@

Make room for a cookie argument passed to audio_attach_mi(). Currently
unused but intended to be used to correlate audio and wskbd devices.

ok ratchov@

Remove unused getdev() audio driver functions.

Remove drain(), query_encoding(), mappage() and get_default_params()
methods from all audio drivers and from the audio_if structure as they
are never called.

Remove all audio format conversion code from the kernel (btw holding
the kernel_lock), as we already do better conversions in
user-mode. Yet, no need for every single driver to fiddle with the
conversion code as they are done transparently by common MI code. With
help from armani and miod, support from mpi

ok armani@

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

Introduce a global interrupt-aware mutex protecting data
structures (including sound-card registers) from concurent
access by syscall and interrupt code-paths. Since critical
sections remain the same, calls to splraise/spllower can be
safely replaced by calls to mtx_enter/mtx_leave with two
exceptions: (1) mutexes are not reentrant (the inner splraise
is thus removed), and (2) we're not allowed to sleep with a
mutex (either msleep is used or the mutex is released before
sleeping).

ok and help from kettenis, a lot of work from armani

No need to check for the size to be a multiple of 4 in the alpha-specific
code to process four samples at a time - we can do as much sets of 4 as possible
before falling back to the remainder processed one byte at a time.

Driver for the TURBOchannel alpha baseboard audio. Ported from NetBSD, with
changes to allow using non-native encodings, and alpha specific code to try
and avoid doing 8 bit memory access.
Tested on 3000/300LX, deaf testing on 3000/600.

Use C99 struct init for struct audio_hw_if

This audio(9) struct will lose a member, but drivers init their struct quite
inconsistently, most pre-C99 style.

Use C99 style everywhere, to get rid of all annoying differences and allow
for easy member removals/additions:
- don't change current order of members
- no explicit NULL members
- no comments or blank lines
- trailing comma in last member line

GENERIC.MP builds fine with this on arm64, amd64, i386 and sparc64.

macppc and alpha build-tested by miod
OK ratchov miod

Remove unused AUDIO_PROP_{MMAP,INDEPENDENT}

AUDIO_PROP_FULLDUPLEX is the only audio(9) in use, the other two died with
commit 1cf2860827c8ca659d8097d8da94a5ae5b888c53
Author: ratchov <ratchov@openbsd.org>
Date: Thu Jun 25 06:43:45 2015 +0000

Reimplement the audio driver in a simpler way, removing unused/unusable
functionality. Same API and ABI except for the removed bits and no
behaviour change for programs using libsndio. With help from armani@
and mpi@, thanks.

but remained defined and set in drivers.

and the following merely moved them when they were dead code already:

commit 9215aa3dfad387bca877a805534df6dcfe8722eb
Author: ratchov <ratchov@openbsd.org>
Date: Wed Aug 31 07:22:43 2016 +0000

Delete unused ioctls and associated macros. Move macros that are still
used internally by low-level drivers from sys/audioio.h to
dev/audio_if.h instead of deleting them.

None of this is used in base or ports; codesearch.debian.net only shows
AUDIO_PROP_{CAPTURE,PLAYBACK} in firefox-esr, mozjs and cubeb.

ratchov points out that audio_if.h and audioio.h are private interfaces
and the codesearch shows SunOS and NetBSD bits (#ifdef'd out on OpenBSD).

OK ratchov

Constify struct {audio,midi,radio,video}_hw_if. No functional change.

ok mpi@ ratchov@ "More const is good" deraadt@

Make room for a cookie argument passed to audio_attach_mi(). Currently
unused but intended to be used to correlate audio and wskbd devices.

ok ratchov@

Remove unused getdev() audio driver functions.

Remove drain(), query_encoding(), mappage() and get_default_params()
methods from all audio drivers and from the audio_if structure as they
are never called.

Remove all audio format conversion code from the kernel (btw holding
the kernel_lock), as we already do better conversions in
user-mode. Yet, no need for every single driver to fiddle with the
conversion code as they are done transparently by common MI code. With
help from armani and miod, support from mpi

ok armani@

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

Introduce a global interrupt-aware mutex protecting data
structures (including sound-card registers) from concurent
access by syscall and interrupt code-paths. Since critical
sections remain the same, calls to splraise/spllower can be
safely replaced by calls to mtx_enter/mtx_leave with two
exceptions: (1) mutexes are not reentrant (the inner splraise
is thus removed), and (2) we're not allowed to sleep with a
mutex (either msleep is used or the mutex is released before
sleeping).

ok and help from kettenis, a lot of work from armani

No need to check for the size to be a multiple of 4 in the alpha-specific
code to process four samples at a time - we can do as much sets of 4 as possible
before falling back to the remainder processed one byte at a time.

Driver for the TURBOchannel alpha baseboard audio. Ported from NetBSD, with
changes to allow using non-native encodings, and alpha specific code to try
and avoid doing 8 bit memory access.
Tested on 3000/300LX, deaf testing on 3000/600.

Constify struct {audio,midi,radio,video}_hw_if. No functional change.

ok mpi@ ratchov@ "More const is good" deraadt@

Make room for a cookie argument passed to audio_attach_mi(). Currently
unused but intended to be used to correlate audio and wskbd devices.

ok ratchov@

Remove unused getdev() audio driver functions.

Remove drain(), query_encoding(), mappage() and get_default_params()
methods from all audio drivers and from the audio_if structure as they
are never called.

Remove all audio format conversion code from the kernel (btw holding
the kernel_lock), as we already do better conversions in
user-mode. Yet, no need for every single driver to fiddle with the
conversion code as they are done transparently by common MI code. With
help from armani and miod, support from mpi

ok armani@

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

Introduce a global interrupt-aware mutex protecting data
structures (including sound-card registers) from concurent
access by syscall and interrupt code-paths. Since critical
sections remain the same, calls to splraise/spllower can be
safely replaced by calls to mtx_enter/mtx_leave with two
exceptions: (1) mutexes are not reentrant (the inner splraise
is thus removed), and (2) we're not allowed to sleep with a
mutex (either msleep is used or the mutex is released before
sleeping).

ok and help from kettenis, a lot of work from armani

No need to check for the size to be a multiple of 4 in the alpha-specific
code to process four samples at a time - we can do as much sets of 4 as possible
before falling back to the remainder processed one byte at a time.

Driver for the TURBOchannel alpha baseboard audio. Ported from NetBSD, with
changes to allow using non-native encodings, and alpha specific code to try
and avoid doing 8 bit memory access.
Tested on 3000/300LX, deaf testing on 3000/600.

Make room for a cookie argument passed to audio_attach_mi(). Currently
unused but intended to be used to correlate audio and wskbd devices.

ok ratchov@

Remove unused getdev() audio driver functions.

Remove drain(), query_encoding(), mappage() and get_default_params()
methods from all audio drivers and from the audio_if structure as they
are never called.

Remove all audio format conversion code from the kernel (btw holding
the kernel_lock), as we already do better conversions in
user-mode. Yet, no need for every single driver to fiddle with the
conversion code as they are done transparently by common MI code. With
help from armani and miod, support from mpi

ok armani@

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

Introduce a global interrupt-aware mutex protecting data
structures (including sound-card registers) from concurent
access by syscall and interrupt code-paths. Since critical
sections remain the same, calls to splraise/spllower can be
safely replaced by calls to mtx_enter/mtx_leave with two
exceptions: (1) mutexes are not reentrant (the inner splraise
is thus removed), and (2) we're not allowed to sleep with a
mutex (either msleep is used or the mutex is released before
sleeping).

ok and help from kettenis, a lot of work from armani

No need to check for the size to be a multiple of 4 in the alpha-specific
code to process four samples at a time - we can do as much sets of 4 as possible
before falling back to the remainder processed one byte at a time.

Driver for the TURBOchannel alpha baseboard audio. Ported from NetBSD, with
changes to allow using non-native encodings, and alpha specific code to try
and avoid doing 8 bit memory access.
Tested on 3000/300LX, deaf testing on 3000/600.

Remove unused getdev() audio driver functions.

Remove drain(), query_encoding(), mappage() and get_default_params()
methods from all audio drivers and from the audio_if structure as they
are never called.

Remove all audio format conversion code from the kernel (btw holding
the kernel_lock), as we already do better conversions in
user-mode. Yet, no need for every single driver to fiddle with the
conversion code as they are done transparently by common MI code. With
help from armani and miod, support from mpi

ok armani@

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

Introduce a global interrupt-aware mutex protecting data
structures (including sound-card registers) from concurent
access by syscall and interrupt code-paths. Since critical
sections remain the same, calls to splraise/spllower can be
safely replaced by calls to mtx_enter/mtx_leave with two
exceptions: (1) mutexes are not reentrant (the inner splraise
is thus removed), and (2) we're not allowed to sleep with a
mutex (either msleep is used or the mutex is released before
sleeping).

ok and help from kettenis, a lot of work from armani

No need to check for the size to be a multiple of 4 in the alpha-specific
code to process four samples at a time - we can do as much sets of 4 as possible
before falling back to the remainder processed one byte at a time.

Driver for the TURBOchannel alpha baseboard audio. Ported from NetBSD, with
changes to allow using non-native encodings, and alpha specific code to try
and avoid doing 8 bit memory access.
Tested on 3000/300LX, deaf testing on 3000/600.