From 1698a08e9a67d82f9a1b778dda598e34ff59c19b Mon Sep 17 00:00:00 2001
From: cg <cg@FreeBSD.org>
Date: Sun, 12 Dec 1999 02:18:58 +0000
Subject: [PATCH] move channel-swapping support to the hardware driver since it
 knows the card state best

---
 sys/dev/sound/pcm/datatypes.h |  2 ++
 sys/dev/sound/pcm/dsp.c       | 11 +----------
 sys/dev/sound/pcm/sound.c     |  7 +++++++
 sys/dev/sound/pcm/sound.h     |  3 +--
 4 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/sys/dev/sound/pcm/datatypes.h b/sys/dev/sound/pcm/datatypes.h
index a163d123222b..5a719c4d419f 100644
--- a/sys/dev/sound/pcm/datatypes.h
+++ b/sys/dev/sound/pcm/datatypes.h
@@ -129,6 +129,7 @@ struct _pcm_channel {
 	void *devinfo;
 };
 
+typedef void (pcm_swap_t)(void *data, int dir);
 #define SND_STATUSLEN	64
 /* descriptor of audio device */
 struct _snddev_info {
@@ -138,6 +139,7 @@ struct _snddev_info {
 	u_long magic;
 	unsigned flags;
 	void *devinfo;
+	pcm_swap_t *swap;
 	char status[SND_STATUSLEN];
 };
 
diff --git a/sys/dev/sound/pcm/dsp.c b/sys/dev/sound/pcm/dsp.c
index 395515534b1b..eceab195de69 100644
--- a/sys/dev/sound/pcm/dsp.c
+++ b/sys/dev/sound/pcm/dsp.c
@@ -70,16 +70,7 @@ setchns(snddev_info *d, int chan)
 	KASSERT((d->flags & SD_F_PRIO_SET) != SD_F_PRIO_SET, \
 		("getchns: read and write both prioritised"));
 	d->flags |= SD_F_DIR_SET;
-	if (d->flags & SD_F_EVILSB16) {
-		if ((d->flags & SD_F_PRIO_RD) && (d->aplay[chan])) {
-			pcm_channel *tmp;
-			tmp = d->arec[chan];
-			d->arec[chan] = d->aplay[chan];
-			d->aplay[chan] = tmp;
-		}
-		if (d->aplay[chan]) chn_setdir(d->aplay[chan], PCMDIR_PLAY);
-		if (d->arec[chan]) chn_setdir(d->arec[chan], PCMDIR_REC);
-	}
+	if (d->swap) d->swap(d->devinfo, (d->flags & SD_F_PRIO_WR)? PCMDIR_PLAY : PCMDIR_REC);
 }
 
 int
diff --git a/sys/dev/sound/pcm/sound.c b/sys/dev/sound/pcm/sound.c
index b464ebd8b3f8..a76a6b078362 100644
--- a/sys/dev/sound/pcm/sound.c
+++ b/sys/dev/sound/pcm/sound.c
@@ -129,6 +129,12 @@ pcm_setflags(device_t dev, u_int32_t val)
 	d->flags = val;
 }
 
+void
+pcm_setswap(device_t dev, pcm_swap_t *swap)
+{
+    	snddev_info *d = device_get_softc(dev);
+	d->swap = swap;
+}
 /* This is the generic init routine */
 int
 pcm_register(device_t dev, void *devinfo, int numplay, int numrec)
@@ -172,6 +178,7 @@ pcm_register(device_t dev, void *devinfo, int numplay, int numrec)
 	fkchan_setup(&d->fakechan);
 	chn_init(&d->fakechan, NULL, 0);
 	d->magic = MAGIC(unit); /* debugging... */
+	d->swap = NULL;
 
     	return 0;
 no:
diff --git a/sys/dev/sound/pcm/sound.h b/sys/dev/sound/pcm/sound.h
index 97cbd0d7cfa6..d2409ef60810 100644
--- a/sys/dev/sound/pcm/sound.h
+++ b/sys/dev/sound/pcm/sound.h
@@ -97,8 +97,6 @@ struct isa_device { int dummy; };
 #define	MAGIC(unit) (0xa4d10de0 + unit)
 
 #define SD_F_SIMPLEX		0x00000001
-#define SD_F_EVILSB16		0x00000002
-#define SD_F_EVILERSB16X	0x00000004
 #define SD_F_PRIO_RD		0x10000000
 #define SD_F_PRIO_WR		0x20000000
 #define SD_F_PRIO_SET		(SD_F_PRIO_RD | SD_F_PRIO_WR)
@@ -165,6 +163,7 @@ int pcm_register(device_t dev, void *devinfo, int numplay, int numrec);
 int pcm_setstatus(device_t dev, char *str);
 u_int32_t pcm_getflags(device_t dev);
 void pcm_setflags(device_t dev, u_int32_t val);
+void pcm_setswap(device_t dev, pcm_swap_t *swap);
 
 #endif /* KERNEL */