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

1 files changed, 1 insertions, 9 deletions

diff --git a/sys/dev/pci/azalia.c b/sys/dev/pci/azalia.c
index 5e73a2d9b57..0b1ab7a831b 100644
--- a/sys/dev/pci/azalia.c
+++ b/sys/dev/pci/azalia.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: azalia.c,v 1.279 2022/10/24 05:59:17 jsg Exp $	*/
+/*	$OpenBSD: azalia.c,v 1.280 2022/10/26 20:19:08 kn Exp $	*/
 /*	$NetBSD: azalia.c,v 1.20 2006/05/07 08:31:44 kent Exp $	*/
 
 /*-
@@ -264,7 +264,6 @@ int	azalia_query_devinfo(void *, mixer_devinfo_t *);
 void	*azalia_allocm(void *, int, size_t, int, int);
 void	azalia_freem(void *, void *, int);
 size_t	azalia_round_buffersize(void *, int, size_t);
-int	azalia_get_props(void *);
 int	azalia_trigger_output(void *, void *, void *, int,
 	void (*)(void *), void *, audio_params_t *);
 int	azalia_trigger_input(void *, void *, void *, int,
@@ -301,7 +300,6 @@ const struct audio_hw_if azalia_hw_if = {
 	.allocm = azalia_allocm,
 	.freem = azalia_freem,
 	.round_buffersize = azalia_round_buffersize,
-	.get_props = azalia_get_props,
 	.trigger_output = azalia_trigger_output,
 	.trigger_input = azalia_trigger_input,
 	.set_blksz = azalia_set_blksz,
@@ -4138,12 +4136,6 @@ azalia_round_buffersize(void *v, int dir, size_t size)
 }
 
 int
-azalia_get_props(void *v)
-{
-	return AUDIO_PROP_FULLDUPLEX;
-}
-
-int
 azalia_trigger_output(void *v, void *start, void *end, int blk,
     void (*intr)(void *), void *arg, audio_params_t *param)
 {