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diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -528,6 +528,7 @@
snd_cmi.4 \
snd_cs4281.4 \
snd_csa.4 \
+ snd_dummy.4 \
snd_emu10k1.4 \
snd_emu10kx.4 \
snd_envy24.4 \
diff --git a/share/man/man4/snd_dummy.4 b/share/man/man4/snd_dummy.4
new file mode 100644
--- /dev/null
+++ b/share/man/man4/snd_dummy.4
@@ -0,0 +1,69 @@
+.\"-
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2024 The FreeBSD Foundation
+.\"
+.\" Portions of this software were developed by Christos Margiolis
+.\" <christos@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd July 15, 2024
+.Dt SND_DUMMY 4
+.Os
+.Sh NAME
+.Nm snd_dummy
+.Nd Dummy audio driver
+.Sh SYNOPSIS
+To load the driver at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+snd_dummy_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver implements a virtual testing device, meaning it does not correspond to a
+physical sound card.
+It is intended for testing, so that test programs do not need to rely on
+hardware being present in the machine in order to run.
+.Pp
+The driver attaches as a regular PCM device, with two channels (one playback
+and one recording), as well as a mixer.
+.Pp
+Playback works by discarding all input, and recording by returning silence
+(zeros).
+.Sh SEE ALSO
+.Xr sound 4 ,
+.Xr loader.conf 5 ,
+.Xr loader 8
+.Sh AUTHORS
+The
+.Nm
+driver was implemented by
+.An Christos Margiolis Aq Mt christos@FreeBSD.org
+under sponsorship from the
+.Fx
+Foundation.
+.Sh CAVEATS
+Because the driver automatically attaches once the module is loaded, it can
+only be attached once.
diff --git a/sys/dev/sound/dummy.c b/sys/dev/sound/dummy.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/sound/dummy.c
@@ -0,0 +1,353 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 The FreeBSD Foundation
+ *
+ * This software was developed by Christos Margiolis <christos@FreeBSD.org>
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+
+#ifdef HAVE_KERNEL_OPTION_HEADERS
+#include "opt_snd.h"
+#endif
+
+#include <dev/sound/pcm/sound.h>
+#include <mixer_if.h>
+
+#define DUMMY_NPCHAN 1
+#define DUMMY_NRCHAN 1
+#define DUMMY_NCHAN (DUMMY_NPCHAN + DUMMY_NRCHAN)
+
+struct dummy_chan {
+ struct dummy_softc *sc;
+ struct pcm_channel *chan;
+ struct snd_dbuf *buf;
+ struct pcmchan_caps *caps;
+ uint32_t ptr;
+ int dir;
+ int run;
+};
+
+struct dummy_softc {
+ struct snddev_info info;
+ device_t dev;
+ uint32_t cap_fmts[4];
+ struct pcmchan_caps caps;
+ int chnum;
+ struct dummy_chan chans[DUMMY_NCHAN];
+ struct callout callout;
+ struct mtx *lock;
+};
+
+static void
+dummy_chan_io(void *arg)
+{
+ struct dummy_softc *sc = arg;
+ struct dummy_chan *ch;
+ int i = 0;
+
+ snd_mtxlock(sc->lock);
+
+ for (i = 0; i < sc->chnum; i++) {
+ ch = &sc->chans[i];
+ if (!ch->run)
+ continue;
+ if (ch->dir == PCMDIR_PLAY)
+ ch->ptr += sndbuf_getblksz(ch->buf);
+ else
+ sndbuf_fillsilence(ch->buf);
+ snd_mtxunlock(sc->lock);
+ chn_intr(ch->chan);
+ snd_mtxlock(sc->lock);
+ }
+ callout_schedule(&sc->callout, 1);
+
+ snd_mtxunlock(sc->lock);
+}
+
+static int
+dummy_chan_free(kobj_t obj, void *data)
+{
+ struct dummy_chan *ch =data;
+ uint8_t *buf;
+
+ buf = sndbuf_getbuf(ch->buf);
+ if (buf != NULL)
+ free(buf, M_DEVBUF);
+
+ return (0);
+}
+
+static void *
+dummy_chan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b,
+ struct pcm_channel *c, int dir)
+{
+ struct dummy_softc *sc;
+ struct dummy_chan *ch;
+ uint8_t *buf;
+ size_t bufsz;
+
+ sc = devinfo;
+
+ snd_mtxlock(sc->lock);
+
+ ch = &sc->chans[sc->chnum++];
+ ch->sc = sc;
+ ch->dir = dir;
+ ch->chan = c;
+ ch->buf = b;
+ ch->caps = &sc->caps;
+
+ snd_mtxunlock(sc->lock);
+
+ bufsz = pcm_getbuffersize(sc->dev, 2048, 2048, 65536);
+ buf = malloc(bufsz, M_DEVBUF, M_WAITOK | M_ZERO);
+ if (sndbuf_setup(ch->buf, buf, bufsz) != 0) {
+ dummy_chan_free(obj, ch);
+ return (NULL);
+ }
+
+ return (ch);
+}
+
+static int
+dummy_chan_setformat(kobj_t obj, void *data, uint32_t format)
+{
+ struct dummy_chan *ch = data;
+ int i;
+
+ for (i = 0; ch->caps->fmtlist[i]; i++)
+ if (format == ch->caps->fmtlist[i])
+ return (0);
+
+ return (EINVAL);
+}
+
+static uint32_t
+dummy_chan_setspeed(kobj_t obj, void *data, uint32_t speed)
+{
+ struct dummy_chan *ch = data;
+
+ RANGE(speed, ch->caps->minspeed, ch->caps->maxspeed);
+
+ return (speed);
+}
+
+static uint32_t
+dummy_chan_setblocksize(kobj_t obj, void *data, uint32_t blocksize)
+{
+ struct dummy_chan *ch = data;
+
+ return (sndbuf_getblksz(ch->buf));
+}
+
+static int
+dummy_chan_trigger(kobj_t obj, void *data, int go)
+{
+ struct dummy_chan *ch = data;
+ struct dummy_softc *sc = ch->sc;
+
+ snd_mtxlock(sc->lock);
+
+ switch (go) {
+ case PCMTRIG_START:
+ if (!callout_active(&sc->callout))
+ callout_reset(&sc->callout, 1, dummy_chan_io, sc);
+ ch->ptr = 0;
+ ch->run = 1;
+ break;
+ case PCMTRIG_STOP:
+ case PCMTRIG_ABORT:
+ ch->run = 0;
+ if (callout_active(&sc->callout))
+ callout_stop(&sc->callout);
+ default:
+ break;
+ }
+
+ snd_mtxunlock(sc->lock);
+
+ return (0);
+}
+
+static uint32_t
+dummy_chan_getptr(kobj_t obj, void *data)
+{
+ struct dummy_chan *ch = data;
+
+ return (ch->run ? ch->ptr : 0);
+}
+
+static struct pcmchan_caps *
+dummy_chan_getcaps(kobj_t obj, void *data)
+{
+ struct dummy_chan *ch = data;
+
+ return (ch->caps);
+}
+
+static kobj_method_t dummy_chan_methods[] = {
+ KOBJMETHOD(channel_init, dummy_chan_init),
+ KOBJMETHOD(channel_free, dummy_chan_free),
+ KOBJMETHOD(channel_setformat, dummy_chan_setformat),
+ KOBJMETHOD(channel_setspeed, dummy_chan_setspeed),
+ KOBJMETHOD(channel_setblocksize,dummy_chan_setblocksize),
+ KOBJMETHOD(channel_trigger, dummy_chan_trigger),
+ KOBJMETHOD(channel_getptr, dummy_chan_getptr),
+ KOBJMETHOD(channel_getcaps, dummy_chan_getcaps),
+ KOBJMETHOD_END
+};
+
+CHANNEL_DECLARE(dummy_chan);
+
+static int
+dummy_mixer_init(struct snd_mixer *m)
+{
+ struct dummy_softc *sc;
+
+ sc = mix_getdevinfo(m);
+ if (sc == NULL)
+ return (-1);
+
+ pcm_setflags(sc->dev, pcm_getflags(sc->dev) | SD_F_SOFTPCMVOL);
+ mix_setdevs(m, SOUND_MASK_PCM | SOUND_MASK_VOLUME | SOUND_MASK_RECLEV);
+ mix_setrecdevs(m, SOUND_MASK_RECLEV);
+
+ return (0);
+}
+
+static int
+dummy_mixer_set(struct snd_mixer *m, unsigned dev, unsigned left, unsigned right)
+{
+ return (0);
+}
+
+static uint32_t
+dummy_mixer_setrecsrc(struct snd_mixer *m, uint32_t src)
+{
+ return (src == SOUND_MASK_RECLEV ? src : 0);
+}
+
+static kobj_method_t dummy_mixer_methods[] = {
+ KOBJMETHOD(mixer_init, dummy_mixer_init),
+ KOBJMETHOD(mixer_set, dummy_mixer_set),
+ KOBJMETHOD(mixer_setrecsrc, dummy_mixer_setrecsrc),
+ KOBJMETHOD_END
+};
+
+MIXER_DECLARE(dummy_mixer);
+
+static void
+dummy_identify(driver_t *driver, device_t parent)
+{
+ if (device_find_child(parent, driver->name, -1) != NULL)
+ return;
+ if (BUS_ADD_CHILD(parent, 0, driver->name, -1) == NULL)
+ device_printf(parent, "add child failed\n");
+}
+
+static int
+dummy_probe(device_t dev)
+{
+ device_set_desc(dev, "Dummy Audio Device");
+
+ return (0);
+}
+
+static int
+dummy_attach(device_t dev)
+{
+ struct dummy_softc *sc;
+ char status[SND_STATUSLEN];
+ int i = 0;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+ sc->lock = snd_mtxcreate(device_get_nameunit(dev), "snd_dummy softc");
+
+ sc->cap_fmts[0] = SND_FORMAT(AFMT_S32_LE, 2, 0);
+ sc->cap_fmts[1] = SND_FORMAT(AFMT_S24_LE, 2, 0);
+ sc->cap_fmts[2] = SND_FORMAT(AFMT_S16_LE, 2, 0);
+ sc->cap_fmts[3] = 0;
+ sc->caps = (struct pcmchan_caps){
+ 8000, /* minspeed */
+ 96000, /* maxspeed */
+ sc->cap_fmts, /* fmtlist */
+ 0, /* caps */
+ };
+
+ pcm_setflags(dev, pcm_getflags(dev) | SD_F_MPSAFE);
+ if (pcm_register(dev, sc, DUMMY_NPCHAN, DUMMY_NRCHAN))
+ return (ENXIO);
+ for (i = 0; i < DUMMY_NPCHAN; i++)
+ pcm_addchan(dev, PCMDIR_PLAY, &dummy_chan_class, sc);
+ for (i = 0; i < DUMMY_NRCHAN; i++)
+ pcm_addchan(dev, PCMDIR_REC, &dummy_chan_class, sc);
+
+ snprintf(status, SND_STATUSLEN, "on %s",
+ device_get_nameunit(device_get_parent(dev)));
+ pcm_setstatus(dev, status);
+ mixer_init(dev, &dummy_mixer_class, sc);
+ callout_init(&sc->callout, 1);
+
+ return (0);
+}
+
+static int
+dummy_detach(device_t dev)
+{
+ struct dummy_softc *sc = device_get_softc(dev);
+ int err;
+
+ err = pcm_unregister(dev);
+ snd_mtxfree(sc->lock);
+
+ return (err);
+}
+
+static device_method_t dummy_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_identify, dummy_identify),
+ DEVMETHOD(device_probe, dummy_probe),
+ DEVMETHOD(device_attach, dummy_attach),
+ DEVMETHOD(device_detach, dummy_detach),
+ DEVMETHOD_END
+};
+
+static driver_t dummy_driver = {
+ "pcm",
+ dummy_methods,
+ sizeof(struct dummy_softc),
+};
+
+DRIVER_MODULE(snd_dummy, nexus, dummy_driver, 0, 0);
+MODULE_DEPEND(snd_dummy, sound, SOUND_MINVER, SOUND_PREFVER, SOUND_MAXVER);
+MODULE_VERSION(snd_dummy, 1);
diff --git a/sys/modules/sound/driver/Makefile b/sys/modules/sound/driver/Makefile
--- a/sys/modules/sound/driver/Makefile
+++ b/sys/modules/sound/driver/Makefile
@@ -8,6 +8,7 @@
SUBDIR+= envy24 envy24ht es137x fm801 hda hdsp hdspe ich
SUBDIR+= ${_maestro3} neomagic solo spicds t4dwave via8233
SUBDIR+= via82c686 vibes driver uaudio
+SUBDIR+= dummy
.if ${MK_SOURCELESS_UCODE} != "no"
_csa= csa
diff --git a/sys/modules/sound/driver/dummy/Makefile b/sys/modules/sound/driver/dummy/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/sound/driver/dummy/Makefile
@@ -0,0 +1,7 @@
+.PATH: ${SRCTOP}/sys/dev/sound
+
+KMOD= snd_dummy
+SRCS= bus_if.h device_if.h
+SRCS+= dummy.c
+
+.include <bsd.kmod.mk>

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