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freebsd-skq/sys/dev/sound/pcm/dsp.c
Ariff Abdullah b45d0ec80d Remove comment that is no longer relevant since previous 
buffering fix.
2006-12-07 07:48:20 +00:00

2361 lines
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/*-
* Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
* All rights reserved.
*
* 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/param.h>
#include <sys/queue.h>
#include <dev/sound/pcm/sound.h>
SND_DECLARE_FILE("$FreeBSD$");
#define OLDPCM_IOCTL
static d_open_t dsp_open;
static d_close_t dsp_close;
static d_read_t dsp_read;
static d_write_t dsp_write;
static d_ioctl_t dsp_ioctl;
static d_poll_t dsp_poll;
static d_mmap_t dsp_mmap;
struct cdevsw dsp_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = dsp_open,
.d_close = dsp_close,
.d_read = dsp_read,
.d_write = dsp_write,
.d_ioctl = dsp_ioctl,
.d_poll = dsp_poll,
.d_mmap = dsp_mmap,
.d_name = "dsp",
};
#ifdef USING_DEVFS
static eventhandler_tag dsp_ehtag;
#endif
static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
static int dsp_oss_syncstart(int sg_id);
static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
#ifdef OSSV4_EXPERIMENT
static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
#endif
static struct snddev_info *
dsp_get_info(struct cdev *dev)
{
struct snddev_info *d;
int unit;
unit = PCMUNIT(dev);
if (unit >= devclass_get_maxunit(pcm_devclass))
return NULL;
d = devclass_get_softc(pcm_devclass, unit);
return d;
}
static u_int32_t
dsp_get_flags(struct cdev *dev)
{
device_t bdev;
int unit;
unit = PCMUNIT(dev);
if (unit >= devclass_get_maxunit(pcm_devclass))
return 0xffffffff;
bdev = devclass_get_device(pcm_devclass, unit);
return pcm_getflags(bdev);
}
static void
dsp_set_flags(struct cdev *dev, u_int32_t flags)
{
device_t bdev;
int unit;
unit = PCMUNIT(dev);
if (unit >= devclass_get_maxunit(pcm_devclass))
return;
bdev = devclass_get_device(pcm_devclass, unit);
pcm_setflags(bdev, flags);
}
/*
* return the channels associated with an open device instance.
* set the priority if the device is simplex and one direction (only) is
* specified.
* lock channels specified.
*/
static int
getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch, u_int32_t prio)
{
struct snddev_info *d;
u_int32_t flags;
flags = dsp_get_flags(dev);
d = dsp_get_info(dev);
pcm_inprog(d, 1);
pcm_lock(d);
KASSERT((flags & SD_F_PRIO_SET) != SD_F_PRIO_SET, \
("getchns: read and write both prioritised"));
if ((flags & SD_F_PRIO_SET) == 0 && (prio != (SD_F_PRIO_RD | SD_F_PRIO_WR))) {
flags |= prio & (SD_F_PRIO_RD | SD_F_PRIO_WR);
dsp_set_flags(dev, flags);
}
*rdch = dev->si_drv1;
*wrch = dev->si_drv2;
if ((flags & SD_F_SIMPLEX) && (flags & SD_F_PRIO_SET)) {
if (prio) {
if (*rdch && flags & SD_F_PRIO_WR) {
dev->si_drv1 = NULL;
*rdch = pcm_getfakechan(d);
} else if (*wrch && flags & SD_F_PRIO_RD) {
dev->si_drv2 = NULL;
*wrch = pcm_getfakechan(d);
}
}
pcm_getfakechan(d)->flags |= CHN_F_BUSY;
}
pcm_unlock(d);
if (*rdch && *rdch != pcm_getfakechan(d) && (prio & SD_F_PRIO_RD))
CHN_LOCK(*rdch);
if (*wrch && *wrch != pcm_getfakechan(d) && (prio & SD_F_PRIO_WR))
CHN_LOCK(*wrch);
return 0;
}
/* unlock specified channels */
static void
relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch, u_int32_t prio)
{
struct snddev_info *d;
d = dsp_get_info(dev);
if (wrch && wrch != pcm_getfakechan(d) && (prio & SD_F_PRIO_WR))
CHN_UNLOCK(wrch);
if (rdch && rdch != pcm_getfakechan(d) && (prio & SD_F_PRIO_RD))
CHN_UNLOCK(rdch);
pcm_inprog(d, -1);
}
static int
dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
{
struct pcm_channel *rdch, *wrch;
struct snddev_info *d;
u_int32_t fmt;
int devtype;
int error;
int chnum;
if (i_dev == NULL || td == NULL)
return ENODEV;
if ((flags & (FREAD | FWRITE)) == 0)
return EINVAL;
d = dsp_get_info(i_dev);
devtype = PCMDEV(i_dev);
chnum = -1;
/* decide default format */
switch (devtype) {
case SND_DEV_DSP16:
fmt = AFMT_S16_LE;
break;
case SND_DEV_DSP:
fmt = AFMT_U8;
break;
case SND_DEV_AUDIO:
fmt = AFMT_MU_LAW;
break;
case SND_DEV_NORESET:
fmt = 0;
break;
case SND_DEV_DSPHW:
/*
* HW *specific* access without channel numbering confusion
* caused by "first come first served" by dsp_clone().
*/
fmt = AFMT_U8;
chnum = PCMCHAN(i_dev);
break;
default:
panic("impossible devtype %d", devtype);
}
/* lock snddev so nobody else can monkey with it */
pcm_lock(d);
rdch = i_dev->si_drv1;
wrch = i_dev->si_drv2;
if (rdch || wrch || ((dsp_get_flags(i_dev) & SD_F_SIMPLEX) &&
(flags & (FREAD | FWRITE)) == (FREAD | FWRITE))) {
/* simplex or not, better safe than sorry. */
pcm_unlock(d);
return EBUSY;
}
/*
* if we get here, the open request is valid- either:
* * we were previously not open
* * we were open for play xor record and the opener wants
* the non-open direction
*/
if (flags & FREAD) {
/* open for read */
pcm_unlock(d);
error = pcm_chnalloc(d, &rdch, PCMDIR_REC, td->td_proc->p_pid, chnum);
if (error != 0 && error != EBUSY && chnum != -1 && (flags & FWRITE))
error = pcm_chnalloc(d, &rdch, PCMDIR_REC, td->td_proc->p_pid, -1);
if (error == 0 && (chn_reset(rdch, fmt) ||
(fmt && chn_setspeed(rdch, DSP_DEFAULT_SPEED))))
error = ENODEV;
if (error != 0) {
if (rdch)
pcm_chnrelease(rdch);
return error;
}
if (flags & O_NONBLOCK)
rdch->flags |= CHN_F_NBIO;
pcm_chnref(rdch, 1);
CHN_UNLOCK(rdch);
pcm_lock(d);
}
if (flags & FWRITE) {
/* open for write */
pcm_unlock(d);
error = pcm_chnalloc(d, &wrch, PCMDIR_PLAY, td->td_proc->p_pid, chnum);
if (error != 0 && error != EBUSY && chnum != -1 && (flags & FREAD))
error = pcm_chnalloc(d, &wrch, PCMDIR_PLAY, td->td_proc->p_pid, -1);
if (error == 0 && (chn_reset(wrch, fmt) ||
(fmt && chn_setspeed(wrch, DSP_DEFAULT_SPEED))))
error = ENODEV;
if (error != 0) {
if (wrch)
pcm_chnrelease(wrch);
if (rdch) {
/*
* Lock, deref and release previously created record channel
*/
CHN_LOCK(rdch);
pcm_chnref(rdch, -1);
pcm_chnrelease(rdch);
}
return error;
}
if (flags & O_NONBLOCK)
wrch->flags |= CHN_F_NBIO;
pcm_chnref(wrch, 1);
CHN_UNLOCK(wrch);
pcm_lock(d);
}
i_dev->si_drv1 = rdch;
i_dev->si_drv2 = wrch;
pcm_unlock(d);
return 0;
}
static int
dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
{
struct pcm_channel *rdch, *wrch;
struct snddev_info *d;
int refs, sg_ids[2];
d = dsp_get_info(i_dev);
pcm_lock(d);
rdch = i_dev->si_drv1;
wrch = i_dev->si_drv2;
pcm_unlock(d);
/*
* Free_unr() may sleep, so store released syncgroup IDs until after
* all locks are released.
*/
sg_ids[0] = sg_ids[1] = 0;
if (rdch || wrch) {
refs = 0;
if (rdch) {
/*
* The channel itself need not be locked because:
* a) Adding a channel to a syncgroup happens only in dsp_ioctl(),
* which cannot run concurrently to dsp_close().
* b) The syncmember pointer (sm) is protected by the global
* syncgroup list lock.
* c) A channel can't just disappear, invalidating pointers,
* unless it's closed/dereferenced first.
*/
PCM_SG_LOCK();
sg_ids[0] = chn_syncdestroy(rdch);
PCM_SG_UNLOCK();
CHN_LOCK(rdch);
refs += pcm_chnref(rdch, -1);
chn_abort(rdch); /* won't sleep */
rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MAPPED | CHN_F_DEAD);
chn_reset(rdch, 0);
pcm_chnrelease(rdch);
}
if (wrch) {
/*
* Please see block above.
*/
PCM_SG_LOCK();
sg_ids[1] = chn_syncdestroy(wrch);
PCM_SG_UNLOCK();
CHN_LOCK(wrch);
refs += pcm_chnref(wrch, -1);
chn_flush(wrch); /* may sleep */
wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MAPPED | CHN_F_DEAD);
chn_reset(wrch, 0);
pcm_chnrelease(wrch);
}
pcm_lock(d);
if (rdch)
i_dev->si_drv1 = NULL;
if (wrch)
i_dev->si_drv2 = NULL;
/*
* If there are no more references, release the channels.
*/
if (refs == 0 && i_dev->si_drv1 == NULL &&
i_dev->si_drv2 == NULL) {
if (pcm_getfakechan(d))
pcm_getfakechan(d)->flags = 0;
/* What is this?!? */
dsp_set_flags(i_dev, dsp_get_flags(i_dev) & ~SD_F_TRANSIENT);
}
pcm_unlock(d);
}
if (sg_ids[0])
free_unr(pcmsg_unrhdr, sg_ids[0]);
if (sg_ids[1])
free_unr(pcmsg_unrhdr, sg_ids[1]);
return 0;
}
static int
dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
{
struct pcm_channel *rdch, *wrch;
int ret;
getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD);
KASSERT(rdch, ("dsp_read: nonexistant channel"));
KASSERT(rdch->flags & CHN_F_BUSY, ("dsp_read: nonbusy channel"));
if (rdch->flags & (CHN_F_MAPPED | CHN_F_DEAD)) {
relchns(i_dev, rdch, wrch, SD_F_PRIO_RD);
return EINVAL;
}
if (!(rdch->flags & CHN_F_RUNNING))
rdch->flags |= CHN_F_RUNNING;
ret = chn_read(rdch, buf);
relchns(i_dev, rdch, wrch, SD_F_PRIO_RD);
return ret;
}
static int
dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
{
struct pcm_channel *rdch, *wrch;
int ret;
getchns(i_dev, &rdch, &wrch, SD_F_PRIO_WR);
KASSERT(wrch, ("dsp_write: nonexistant channel"));
KASSERT(wrch->flags & CHN_F_BUSY, ("dsp_write: nonbusy channel"));
if (wrch->flags & (CHN_F_MAPPED | CHN_F_DEAD)) {
relchns(i_dev, rdch, wrch, SD_F_PRIO_WR);
return EINVAL;
}
if (!(wrch->flags & CHN_F_RUNNING))
wrch->flags |= CHN_F_RUNNING;
/*
* Chn_write() must give up channel lock in order to copy bytes from
* userland, so up the "in progress" counter to make sure someone
* else doesn't come along and muss up the buffer.
*/
++wrch->inprog;
ret = chn_write(wrch, buf);
--wrch->inprog;
cv_signal(&wrch->cv);
relchns(i_dev, rdch, wrch, SD_F_PRIO_WR);
return ret;
}
static int
dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode, struct thread *td)
{
struct pcm_channel *chn, *rdch, *wrch;
struct snddev_info *d;
int kill;
int ret = 0, *arg_i = (int *)arg, tmp;
int xcmd;
xcmd = 0;
/*
* this is an evil hack to allow broken apps to perform mixer ioctls
* on dsp devices.
*/
d = dsp_get_info(i_dev);
if (IOCGROUP(cmd) == 'M') {
/*
* This is at least, a bug to bug compatible with OSS.
*/
if (d->mixer_dev != NULL)
return mixer_ioctl(d->mixer_dev, cmd, arg, -1, td);
else
return EBADF;
}
/*
* Certain ioctls may be made on any type of device (audio, mixer,
* and MIDI). Handle those special cases here.
*/
if (IOCGROUP(cmd) == 'X') {
switch(cmd) {
case SNDCTL_SYSINFO:
sound_oss_sysinfo((oss_sysinfo *)arg);
break;
case SNDCTL_AUDIOINFO:
ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
break;
case SNDCTL_MIXERINFO:
ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
break;
default:
ret = EINVAL;
}
return ret;
}
getchns(i_dev, &rdch, &wrch, 0);
kill = 0;
if (wrch && (wrch->flags & CHN_F_DEAD))
kill |= 1;
if (rdch && (rdch->flags & CHN_F_DEAD))
kill |= 2;
if (kill == 3) {
relchns(i_dev, rdch, wrch, 0);
return EINVAL;
}
if (kill & 1)
wrch = NULL;
if (kill & 2)
rdch = NULL;
switch(cmd) {
#ifdef OLDPCM_IOCTL
/*
* we start with the new ioctl interface.
*/
case AIONWRITE: /* how many bytes can write ? */
if (wrch) {
CHN_LOCK(wrch);
/*
if (wrch && wrch->bufhard.dl)
while (chn_wrfeed(wrch) == 0);
*/
*arg_i = sndbuf_getfree(wrch->bufsoft);
CHN_UNLOCK(wrch);
} else {
*arg_i = 0;
ret = EINVAL;
}
break;
case AIOSSIZE: /* set the current blocksize */
{
struct snd_size *p = (struct snd_size *)arg;
p->play_size = 0;
p->rec_size = 0;
if (wrch) {
CHN_LOCK(wrch);
chn_setblocksize(wrch, 2, p->play_size);
p->play_size = sndbuf_getblksz(wrch->bufsoft);
CHN_UNLOCK(wrch);
}
if (rdch) {
CHN_LOCK(rdch);
chn_setblocksize(rdch, 2, p->rec_size);
p->rec_size = sndbuf_getblksz(rdch->bufsoft);
CHN_UNLOCK(rdch);
}
}
break;
case AIOGSIZE: /* get the current blocksize */
{
struct snd_size *p = (struct snd_size *)arg;
if (wrch) {
CHN_LOCK(wrch);
p->play_size = sndbuf_getblksz(wrch->bufsoft);
CHN_UNLOCK(wrch);
}
if (rdch) {
CHN_LOCK(rdch);
p->rec_size = sndbuf_getblksz(rdch->bufsoft);
CHN_UNLOCK(rdch);
}
}
break;
case AIOSFMT:
case AIOGFMT:
{
snd_chan_param *p = (snd_chan_param *)arg;
if (cmd == AIOSFMT &&
((p->play_format != 0 && p->play_rate == 0) ||
(p->rec_format != 0 && p->rec_rate == 0))) {
ret = EINVAL;
break;
}
if (wrch) {
CHN_LOCK(wrch);
if (cmd == AIOSFMT && p->play_format != 0) {
chn_setformat(wrch, p->play_format);
chn_setspeed(wrch, p->play_rate);
}
p->play_rate = wrch->speed;
p->play_format = wrch->format;
CHN_UNLOCK(wrch);
} else {
p->play_rate = 0;
p->play_format = 0;
}
if (rdch) {
CHN_LOCK(rdch);
if (cmd == AIOSFMT && p->rec_format != 0) {
chn_setformat(rdch, p->rec_format);
chn_setspeed(rdch, p->rec_rate);
}
p->rec_rate = rdch->speed;
p->rec_format = rdch->format;
CHN_UNLOCK(rdch);
} else {
p->rec_rate = 0;
p->rec_format = 0;
}
}
break;
case AIOGCAP: /* get capabilities */
{
snd_capabilities *p = (snd_capabilities *)arg;
struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
struct cdev *pdev;
if (rdch) {
CHN_LOCK(rdch);
rcaps = chn_getcaps(rdch);
}
if (wrch) {
CHN_LOCK(wrch);
pcaps = chn_getcaps(wrch);
}
p->rate_min = max(rcaps? rcaps->minspeed : 0,
pcaps? pcaps->minspeed : 0);
p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
pcaps? pcaps->maxspeed : 1000000);
p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
/* XXX bad on sb16 */
p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
(wrch? chn_getformats(wrch) : 0xffffffff);
if (rdch && wrch)
p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
pdev = d->mixer_dev;
p->mixers = 1; /* default: one mixer */
p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
p->left = p->right = 100;
if (rdch)
CHN_UNLOCK(rdch);
if (wrch)
CHN_UNLOCK(wrch);
}
break;
case AIOSTOP:
if (*arg_i == AIOSYNC_PLAY && wrch) {
CHN_LOCK(wrch);
*arg_i = chn_abort(wrch);
CHN_UNLOCK(wrch);
} else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
CHN_LOCK(rdch);
*arg_i = chn_abort(rdch);
CHN_UNLOCK(rdch);
} else {
printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
*arg_i = 0;
}
break;
case AIOSYNC:
printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
break;
#endif
/*
* here follow the standard ioctls (filio.h etc.)
*/
case FIONREAD: /* get # bytes to read */
if (rdch) {
CHN_LOCK(rdch);
/* if (rdch && rdch->bufhard.dl)
while (chn_rdfeed(rdch) == 0);
*/
*arg_i = sndbuf_getready(rdch->bufsoft);
CHN_UNLOCK(rdch);
} else {
*arg_i = 0;
ret = EINVAL;
}
break;
case FIOASYNC: /*set/clear async i/o */
DEB( printf("FIOASYNC\n") ; )
break;
case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
case FIONBIO: /* set/clear non-blocking i/o */
if (rdch) {
CHN_LOCK(rdch);
if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
rdch->flags |= CHN_F_NBIO;
else
rdch->flags &= ~CHN_F_NBIO;
CHN_UNLOCK(rdch);
}
if (wrch) {
CHN_LOCK(wrch);
if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
wrch->flags |= CHN_F_NBIO;
else
wrch->flags &= ~CHN_F_NBIO;
CHN_UNLOCK(wrch);
}
break;
/*
* Finally, here is the linux-compatible ioctl interface
*/
#define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
case SNDCTL_DSP_GETBLKSIZE:
chn = wrch ? wrch : rdch;
if (chn) {
CHN_LOCK(chn);
*arg_i = sndbuf_getblksz(chn->bufsoft);
CHN_UNLOCK(chn);
} else {
*arg_i = 0;
ret = EINVAL;
}
break ;
case SNDCTL_DSP_SETBLKSIZE:
RANGE(*arg_i, 16, 65536);
if (wrch) {
CHN_LOCK(wrch);
chn_setblocksize(wrch, 2, *arg_i);
CHN_UNLOCK(wrch);
}
if (rdch) {
CHN_LOCK(rdch);
chn_setblocksize(rdch, 2, *arg_i);
CHN_UNLOCK(rdch);
}
break;
case SNDCTL_DSP_RESET:
DEB(printf("dsp reset\n"));
if (wrch) {
CHN_LOCK(wrch);
chn_abort(wrch);
chn_resetbuf(wrch);
CHN_UNLOCK(wrch);
}
if (rdch) {
CHN_LOCK(rdch);
chn_abort(rdch);
chn_resetbuf(rdch);
CHN_UNLOCK(rdch);
}
break;
case SNDCTL_DSP_SYNC:
DEB(printf("dsp sync\n"));
/* chn_sync may sleep */
if (wrch) {
CHN_LOCK(wrch);
chn_sync(wrch, 0);
CHN_UNLOCK(wrch);
}
break;
case SNDCTL_DSP_SPEED:
/* chn_setspeed may sleep */
tmp = 0;
if (wrch) {
CHN_LOCK(wrch);
ret = chn_setspeed(wrch, *arg_i);
tmp = wrch->speed;
CHN_UNLOCK(wrch);
}
if (rdch && ret == 0) {
CHN_LOCK(rdch);
ret = chn_setspeed(rdch, *arg_i);
if (tmp == 0)
tmp = rdch->speed;
CHN_UNLOCK(rdch);
}
*arg_i = tmp;
break;
case SOUND_PCM_READ_RATE:
chn = wrch ? wrch : rdch;
if (chn) {
CHN_LOCK(chn);
*arg_i = chn->speed;
CHN_UNLOCK(chn);
} else {
*arg_i = 0;
ret = EINVAL;
}
break;
case SNDCTL_DSP_STEREO:
tmp = -1;
*arg_i = (*arg_i)? AFMT_STEREO : 0;
if (wrch) {
CHN_LOCK(wrch);
ret = chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) | *arg_i);
tmp = (wrch->format & AFMT_STEREO)? 1 : 0;
CHN_UNLOCK(wrch);
}
if (rdch && ret == 0) {
CHN_LOCK(rdch);
ret = chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) | *arg_i);
if (tmp == -1)
tmp = (rdch->format & AFMT_STEREO)? 1 : 0;
CHN_UNLOCK(rdch);
}
*arg_i = tmp;
break;
case SOUND_PCM_WRITE_CHANNELS:
/* case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
if (*arg_i != 0) {
tmp = 0;
*arg_i = (*arg_i != 1)? AFMT_STEREO : 0;
if (wrch) {
CHN_LOCK(wrch);
ret = chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) | *arg_i);
tmp = (wrch->format & AFMT_STEREO)? 2 : 1;
CHN_UNLOCK(wrch);
}
if (rdch && ret == 0) {
CHN_LOCK(rdch);
ret = chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) | *arg_i);
if (tmp == 0)
tmp = (rdch->format & AFMT_STEREO)? 2 : 1;
CHN_UNLOCK(rdch);
}
*arg_i = tmp;
} else {
chn = wrch ? wrch : rdch;
CHN_LOCK(chn);
*arg_i = (chn->format & AFMT_STEREO) ? 2 : 1;
CHN_UNLOCK(chn);
}
break;
case SOUND_PCM_READ_CHANNELS:
chn = wrch ? wrch : rdch;
if (chn) {
CHN_LOCK(chn);
*arg_i = (chn->format & AFMT_STEREO) ? 2 : 1;
CHN_UNLOCK(chn);
} else {
*arg_i = 0;
ret = EINVAL;
}
break;
case SNDCTL_DSP_GETFMTS: /* returns a mask of supported fmts */
chn = wrch ? wrch : rdch;
if (chn) {
CHN_LOCK(chn);
*arg_i = chn_getformats(chn);
CHN_UNLOCK(chn);
} else {
*arg_i = 0;
ret = EINVAL;
}
break ;
case SNDCTL_DSP_SETFMT: /* sets _one_ format */
if ((*arg_i != AFMT_QUERY)) {
tmp = 0;
if (wrch) {
CHN_LOCK(wrch);
ret = chn_setformat(wrch, (*arg_i) | (wrch->format & AFMT_STEREO));
tmp = wrch->format & ~AFMT_STEREO;
CHN_UNLOCK(wrch);
}
if (rdch && ret == 0) {
CHN_LOCK(rdch);
ret = chn_setformat(rdch, (*arg_i) | (rdch->format & AFMT_STEREO));
if (tmp == 0)
tmp = rdch->format & ~AFMT_STEREO;
CHN_UNLOCK(rdch);
}
*arg_i = tmp;
} else {
chn = wrch ? wrch : rdch;
CHN_LOCK(chn);
*arg_i = chn->format & ~AFMT_STEREO;
CHN_UNLOCK(chn);
}
break;
case SNDCTL_DSP_SETFRAGMENT:
DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
{
u_int32_t fragln = (*arg_i) & 0x0000ffff;
u_int32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
u_int32_t fragsz;
u_int32_t r_maxfrags, r_fragsz;
RANGE(fragln, 4, 16);
fragsz = 1 << fragln;
if (maxfrags == 0)
maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
if (maxfrags < 2)
maxfrags = 2;
if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
if (rdch) {
CHN_LOCK(rdch);
ret = chn_setblocksize(rdch, maxfrags, fragsz);
r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
r_fragsz = sndbuf_getblksz(rdch->bufsoft);
CHN_UNLOCK(rdch);
} else {
r_maxfrags = maxfrags;
r_fragsz = fragsz;
}
if (wrch && ret == 0) {
CHN_LOCK(wrch);
ret = chn_setblocksize(wrch, maxfrags, fragsz);
maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
fragsz = sndbuf_getblksz(wrch->bufsoft);
CHN_UNLOCK(wrch);
} else { /* use whatever came from the read channel */
maxfrags = r_maxfrags;
fragsz = r_fragsz;
}
fragln = 0;
while (fragsz > 1) {
fragln++;
fragsz >>= 1;
}
*arg_i = (maxfrags << 16) | fragln;
}
break;
case SNDCTL_DSP_GETISPACE:
/* return the size of data available in the input queue */
{
audio_buf_info *a = (audio_buf_info *)arg;
if (rdch) {
struct snd_dbuf *bs = rdch->bufsoft;
CHN_LOCK(rdch);
a->bytes = sndbuf_getready(bs);
a->fragments = a->bytes / sndbuf_getblksz(bs);
a->fragstotal = sndbuf_getblkcnt(bs);
a->fragsize = sndbuf_getblksz(bs);
CHN_UNLOCK(rdch);
}
}
break;
case SNDCTL_DSP_GETOSPACE:
/* return space available in the output queue */
{
audio_buf_info *a = (audio_buf_info *)arg;
if (wrch) {
struct snd_dbuf *bs = wrch->bufsoft;
CHN_LOCK(wrch);
/* XXX abusive DMA update: chn_wrupdate(wrch); */
a->bytes = sndbuf_getfree(bs);
a->fragments = a->bytes / sndbuf_getblksz(bs);
a->fragstotal = sndbuf_getblkcnt(bs);
a->fragsize = sndbuf_getblksz(bs);
CHN_UNLOCK(wrch);
}
}
break;
case SNDCTL_DSP_GETIPTR:
{
count_info *a = (count_info *)arg;
if (rdch) {
struct snd_dbuf *bs = rdch->bufsoft;
CHN_LOCK(rdch);
/* XXX abusive DMA update: chn_rdupdate(rdch); */
a->bytes = sndbuf_gettotal(bs);
a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
a->ptr = sndbuf_getreadyptr(bs);
rdch->blocks = sndbuf_getblocks(bs);
CHN_UNLOCK(rdch);
} else
ret = EINVAL;
}
break;
case SNDCTL_DSP_GETOPTR:
{
count_info *a = (count_info *)arg;
if (wrch) {
struct snd_dbuf *bs = wrch->bufsoft;
CHN_LOCK(wrch);
/* XXX abusive DMA update: chn_wrupdate(wrch); */
a->bytes = sndbuf_gettotal(bs);
a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
a->ptr = sndbuf_getreadyptr(bs);
wrch->blocks = sndbuf_getblocks(bs);
CHN_UNLOCK(wrch);
} else
ret = EINVAL;
}
break;
case SNDCTL_DSP_GETCAPS:
*arg_i = DSP_CAP_REALTIME | DSP_CAP_MMAP | DSP_CAP_TRIGGER;
if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
*arg_i |= DSP_CAP_DUPLEX;
break;
case SOUND_PCM_READ_BITS:
chn = wrch ? wrch : rdch;
if (chn) {
CHN_LOCK(chn);
if (chn->format & AFMT_8BIT)
*arg_i = 8;
else if (chn->format & AFMT_16BIT)
*arg_i = 16;
else if (chn->format & AFMT_24BIT)
*arg_i = 24;
else if (chn->format & AFMT_32BIT)
*arg_i = 32;
else
ret = EINVAL;
CHN_UNLOCK(chn);
} else {
*arg_i = 0;
ret = EINVAL;
}
break;
case SNDCTL_DSP_SETTRIGGER:
if (rdch) {
CHN_LOCK(rdch);
rdch->flags &= ~(CHN_F_TRIGGERED | CHN_F_NOTRIGGER);
if (*arg_i & PCM_ENABLE_INPUT)
chn_start(rdch, 1);
else
rdch->flags |= CHN_F_NOTRIGGER;
CHN_UNLOCK(rdch);
}
if (wrch) {
CHN_LOCK(wrch);
wrch->flags &= ~(CHN_F_TRIGGERED | CHN_F_NOTRIGGER);
if (*arg_i & PCM_ENABLE_OUTPUT)
chn_start(wrch, 1);
else
wrch->flags |= CHN_F_NOTRIGGER;
CHN_UNLOCK(wrch);
}
break;
case SNDCTL_DSP_GETTRIGGER:
*arg_i = 0;
if (wrch) {
CHN_LOCK(wrch);
if (wrch->flags & CHN_F_TRIGGERED)
*arg_i |= PCM_ENABLE_OUTPUT;
CHN_UNLOCK(wrch);
}
if (rdch) {
CHN_LOCK(rdch);
if (rdch->flags & CHN_F_TRIGGERED)
*arg_i |= PCM_ENABLE_INPUT;
CHN_UNLOCK(rdch);
}
break;
case SNDCTL_DSP_GETODELAY:
if (wrch) {
struct snd_dbuf *bs = wrch->bufsoft;
CHN_LOCK(wrch);
/* XXX abusive DMA update: chn_wrupdate(wrch); */
*arg_i = sndbuf_getready(bs);
CHN_UNLOCK(wrch);
} else
ret = EINVAL;
break;
case SNDCTL_DSP_POST:
if (wrch) {
CHN_LOCK(wrch);
wrch->flags &= ~CHN_F_NOTRIGGER;
chn_start(wrch, 1);
CHN_UNLOCK(wrch);
}
break;
case SNDCTL_DSP_SETDUPLEX:
/*
* switch to full-duplex mode if card is in half-duplex
* mode and is able to work in full-duplex mode
*/
if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
break;
/*
* The following four ioctls are simple wrappers around mixer_ioctl
* with no further processing. xcmd is short for "translated
* command".
*/
case SNDCTL_DSP_GETRECVOL:
if (xcmd == 0)
xcmd = SOUND_MIXER_READ_RECLEV;
/* FALLTHROUGH */
case SNDCTL_DSP_SETRECVOL:
if (xcmd == 0)
xcmd = SOUND_MIXER_WRITE_RECLEV;
/* FALLTHROUGH */
case SNDCTL_DSP_GETPLAYVOL:
if (xcmd == 0)
xcmd = SOUND_MIXER_READ_PCM;
/* FALLTHROUGH */
case SNDCTL_DSP_SETPLAYVOL:
if (xcmd == 0)
xcmd = SOUND_MIXER_WRITE_PCM;
if (d->mixer_dev != NULL)
ret = mixer_ioctl(d->mixer_dev, xcmd, arg, -1, td);
else
ret = ENOTSUP;
break;
case SNDCTL_DSP_GET_RECSRC_NAMES:
case SNDCTL_DSP_GET_RECSRC:
case SNDCTL_DSP_SET_RECSRC:
if (d->mixer_dev != NULL)
ret = mixer_ioctl(d->mixer_dev, cmd, arg, -1, td);
else
ret = ENOTSUP;
break;
/*
* The following 3 ioctls aren't very useful at the moment. For
* now, only a single channel is associated with a cdev (/dev/dspN
* instance), so there's only a single output routing to use (i.e.,
* the wrch bound to this cdev).
*/
case SNDCTL_DSP_GET_PLAYTGT_NAMES:
{
oss_mixer_enuminfo *ei;
ei = (oss_mixer_enuminfo *)arg;
ei->dev = 0;
ei->ctrl = 0;
ei->version = 0; /* static for now */
ei->strindex[0] = 0;
if (wrch != NULL) {
ei->nvalues = 1;
strlcpy(ei->strings, wrch->name,
sizeof(ei->strings));
} else {
ei->nvalues = 0;
ei->strings[0] = '\0';
}
}
break;
case SNDCTL_DSP_GET_PLAYTGT:
case SNDCTL_DSP_SET_PLAYTGT: /* yes, they are the same for now */
/*
* Re: SET_PLAYTGT
* OSSv4: "The value that was accepted by the device will
* be returned back in the variable pointed by the
* argument."
*/
if (wrch != NULL)
*arg_i = 0;
else
ret = EINVAL;
break;
case SNDCTL_DSP_SILENCE:
/*
* Flush the software (pre-feed) buffer, but try to minimize playback
* interruption. (I.e., record unplayed samples with intent to
* restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
* functionality.
*/
if (wrch == NULL)
ret = EINVAL;
else {
struct snd_dbuf *bs;
CHN_LOCK(wrch);
while (wrch->inprog != 0)
cv_wait(&wrch->cv, wrch->lock);
bs = wrch->bufsoft;
if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
bs->sl = sndbuf_getready(bs);
sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
sndbuf_fillsilence(bs);
chn_start(wrch, 0);
}
CHN_UNLOCK(wrch);
}
break;
case SNDCTL_DSP_SKIP:
/*
* OSSv4 docs: "This ioctl call discards all unplayed samples in the
* playback buffer by moving the current write position immediately
* before the point where the device is currently reading the samples."
*/
if (wrch == NULL)
ret = EINVAL;
else {
struct snd_dbuf *bs;
CHN_LOCK(wrch);
while (wrch->inprog != 0)
cv_wait(&wrch->cv, wrch->lock);
bs = wrch->bufsoft;
if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
sndbuf_softreset(bs);
sndbuf_acquire(bs, bs->shadbuf, bs->sl);
bs->sl = 0;
chn_start(wrch, 0);
}
CHN_UNLOCK(wrch);
}
break;
case SNDCTL_DSP_CURRENT_OPTR:
case SNDCTL_DSP_CURRENT_IPTR:
/**
* @note Changing formats resets the buffer counters, which differs
* from the 4Front drivers. However, I don't expect this to be
* much of a problem.
*
* @note In a test where @c CURRENT_OPTR is called immediately after write
* returns, this driver is about 32K samples behind whereas
* 4Front's is about 8K samples behind. Should determine source
* of discrepancy, even if only out of curiosity.
*
* @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
*/
chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
if (chn == NULL)
ret = EINVAL;
else {
struct snd_dbuf *bs;
/* int tmp; */
oss_count_t *oc = (oss_count_t *)arg;
CHN_LOCK(chn);
bs = chn->bufsoft;
#if 0
tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getbps(b);
oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getbps(b);
#else
oc->samples = sndbuf_gettotal(bs) / sndbuf_getbps(bs);
oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getbps(bs);
#endif
CHN_UNLOCK(chn);
}
break;
case SNDCTL_DSP_HALT_OUTPUT:
case SNDCTL_DSP_HALT_INPUT:
chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
if (chn == NULL)
ret = EINVAL;
else {
CHN_LOCK(chn);
chn_abort(chn);
CHN_UNLOCK(chn);
}
break;
case SNDCTL_DSP_LOW_WATER:
/*
* Set the number of bytes required to attract attention by
* select/poll.
*/
if (wrch != NULL) {
CHN_LOCK(wrch);
wrch->lw = (*arg_i > 1) ? *arg_i : 1;
CHN_UNLOCK(wrch);
}
if (rdch != NULL) {
CHN_LOCK(rdch);
rdch->lw = (*arg_i > 1) ? *arg_i : 1;
CHN_UNLOCK(rdch);
}
break;
case SNDCTL_DSP_GETERROR:
/*
* OSSv4 docs: "All errors and counters will automatically be
* cleared to zeroes after the call so each call will return only
* the errors that occurred after the previous invocation. ... The
* play_underruns and rec_overrun fields are the only usefull fields
* returned by OSS 4.0."
*/
{
audio_errinfo *ei = (audio_errinfo *)arg;
bzero((void *)ei, sizeof(*ei));
if (wrch != NULL) {
CHN_LOCK(wrch);
ei->play_underruns = wrch->xruns;
wrch->xruns = 0;
CHN_UNLOCK(wrch);
}
if (rdch != NULL) {
CHN_LOCK(rdch);
ei->rec_overruns = rdch->xruns;
rdch->xruns = 0;
CHN_UNLOCK(rdch);
}
}
break;
case SNDCTL_DSP_SYNCGROUP:
ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
break;
case SNDCTL_DSP_SYNCSTART:
ret = dsp_oss_syncstart(*arg_i);
break;
case SNDCTL_DSP_POLICY:
ret = dsp_oss_policy(wrch, rdch, *arg_i);
break;
#ifdef OSSV4_EXPERIMENT
/*
* XXX The following ioctls are not yet supported and just return
* EINVAL.
*/
case SNDCTL_DSP_GETOPEAKS:
case SNDCTL_DSP_GETIPEAKS:
chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
if (chn == NULL)
ret = EINVAL;
else {
oss_peaks_t *op = (oss_peaks_t *)arg;
int lpeak, rpeak;
CHN_LOCK(chn);
ret = chn_getpeaks(chn, &lpeak, &rpeak);
if (ret == -1)
ret = EINVAL;
else {
(*op)[0] = lpeak;
(*op)[1] = rpeak;
}
CHN_UNLOCK(chn);
}
break;
case SNDCTL_DSP_COOKEDMODE:
ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
break;
case SNDCTL_DSP_GET_CHNORDER:
ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
break;
case SNDCTL_DSP_SET_CHNORDER:
ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
break;
case SNDCTL_GETLABEL:
ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
break;
case SNDCTL_SETLABEL:
ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
break;
case SNDCTL_GETSONG:
ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
break;
case SNDCTL_SETSONG:
ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
break;
case SNDCTL_SETNAME:
ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
break;
#if 0
/**
* @note The SNDCTL_CARDINFO ioctl was omitted per 4Front developer
* documentation. "The usability of this call is very limited. It's
* provided only for completeness of the API. OSS API doesn't have
* any concept of card. Any information returned by this ioctl calld
* is reserved exclusively for the utility programs included in the
* OSS package. Applications should not try to use for this
* information in any ways."
*/
case SNDCTL_CARDINFO:
ret = EINVAL;
break;
/**
* @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
* @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
* 4Front Technologies.
*/
case SNDCTL_DSP_READCTL:
case SNDCTL_DSP_WRITECTL:
ret = EINVAL;
break;
#endif /* !0 (explicitly omitted ioctls) */
#endif /* !OSSV4_EXPERIMENT */
case SNDCTL_DSP_MAPINBUF:
case SNDCTL_DSP_MAPOUTBUF:
case SNDCTL_DSP_SETSYNCRO:
/* undocumented */
case SNDCTL_DSP_SUBDIVIDE:
case SOUND_PCM_WRITE_FILTER:
case SOUND_PCM_READ_FILTER:
/* dunno what these do, don't sound important */
default:
DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
ret = EINVAL;
break;
}
relchns(i_dev, rdch, wrch, 0);
return ret;
}
static int
dsp_poll(struct cdev *i_dev, int events, struct thread *td)
{
struct pcm_channel *wrch = NULL, *rdch = NULL;
int ret, e;
ret = 0;
getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
if (wrch) {
e = (events & (POLLOUT | POLLWRNORM));
if (e)
ret |= chn_poll(wrch, e, td);
}
if (rdch) {
e = (events & (POLLIN | POLLRDNORM));
if (e)
ret |= chn_poll(rdch, e, td);
}
relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
return ret;
}
static int
dsp_mmap(struct cdev *i_dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
{
struct pcm_channel *wrch = NULL, *rdch = NULL, *c;
if (nprot & PROT_EXEC)
return -1;
getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
#if 0
/*
* XXX the linux api uses the nprot to select read/write buffer
* our vm system doesn't allow this, so force write buffer
*/
if (wrch && (nprot & PROT_WRITE)) {
c = wrch;
} else if (rdch && (nprot & PROT_READ)) {
c = rdch;
} else {
return -1;
}
#else
c = wrch;
#endif
if (c == NULL) {
relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
return -1;
}
if (offset >= sndbuf_getsize(c->bufsoft)) {
relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
return -1;
}
if (!(c->flags & CHN_F_MAPPED))
c->flags |= CHN_F_MAPPED;
*paddr = vtophys(sndbuf_getbufofs(c->bufsoft, offset));
relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
return 0;
}
#ifdef USING_DEVFS
/*
* Clone logic is this:
* x E X = {dsp, dspW, audio}
* x -> x${sysctl("hw.snd.unit")}
* xN->
* for i N = 1 to channels of device N
* if xN.i isn't busy, return its dev_t
*/
static void
dsp_clone(void *arg, struct ucred *cred, char *name, int namelen,
struct cdev **dev)
{
struct cdev *pdev;
struct snddev_info *pcm_dev;
struct snddev_channel *pcm_chan;
int i, unit, devtype;
static int devtypes[3] = {SND_DEV_DSP, SND_DEV_DSP16, SND_DEV_AUDIO};
static char *devnames[3] = {"dsp", "dspW", "audio"};
if (*dev != NULL)
return;
if (pcm_devclass == NULL)
return;
devtype = 0;
unit = -1;
for (i = 0; (i < 3) && (unit == -1); i++) {
devtype = devtypes[i];
if (strcmp(name, devnames[i]) == 0) {
unit = snd_unit;
} else {
if (dev_stdclone(name, NULL, devnames[i], &unit) != 1)
unit = -1;
}
}
if (unit == -1 || unit >= devclass_get_maxunit(pcm_devclass))
return;
pcm_dev = devclass_get_softc(pcm_devclass, unit);
if (pcm_dev == NULL)
return;
SLIST_FOREACH(pcm_chan, &pcm_dev->channels, link) {
switch(devtype) {
case SND_DEV_DSP:
pdev = pcm_chan->dsp_devt;
break;
case SND_DEV_DSP16:
pdev = pcm_chan->dspW_devt;
break;
case SND_DEV_AUDIO:
pdev = pcm_chan->audio_devt;
break;
default:
panic("Unknown devtype %d", devtype);
}
if ((pdev != NULL) && (pdev->si_drv1 == NULL) && (pdev->si_drv2 == NULL)) {
*dev = pdev;
dev_ref(*dev);
return;
}
}
}
static void
dsp_sysinit(void *p)
{
dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
}
static void
dsp_sysuninit(void *p)
{
if (dsp_ehtag != NULL)
EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
}
SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
#endif
/**
* @brief Handler for SNDCTL_AUDIOINFO.
*
* Gathers information about the audio device specified in ai->dev. If
* ai->dev == -1, then this function gathers information about the current
* device. If the call comes in on a non-audio device and ai->dev == -1,
* return EINVAL.
*
* This routine is supposed to go practically straight to the hardware,
* getting capabilities directly from the sound card driver, side-stepping
* the intermediate channel interface.
*
* Note, however, that the usefulness of this command is significantly
* decreased when requesting info about any device other than the one serving
* the request. While each snddev_channel refers to a specific device node,
* the converse is *not* true. Currently, when a sound device node is opened,
* the sound subsystem scans for an available audio channel (or channels, if
* opened in read+write) and then assigns them to the si_drv[12] private
* data fields. As a result, any information returned linking a channel to
* a specific character device isn't necessarily accurate.
*
* @note
* Calling threads must not hold any snddev_info or pcm_channel locks.
*
* @param dev device on which the ioctl was issued
* @param ai ioctl request data container
*
* @retval 0 success
* @retval EINVAL ai->dev specifies an invalid device
*
* @todo Verify correctness of Doxygen tags. ;)
*/
int
dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
{
struct snddev_channel *sce;
struct pcmchan_caps *caps;
struct pcm_channel *ch;
struct snddev_info *d;
struct cdev *t_cdev;
uint32_t fmts;
int i, nchan, ret, *rates, minch, maxch;
/*
* If probing the device that received the ioctl, make sure it's a
* DSP device. (Users may use this ioctl with /dev/mixer and
* /dev/midi.)
*/
if ((ai->dev == -1) && (i_dev->si_devsw != &dsp_cdevsw))
return EINVAL;
ch = NULL;
t_cdev = NULL;
nchan = 0;
ret = 0;
/*
* Search for the requested audio device (channel). Start by
* iterating over pcm devices.
*/
for (i = 0; i < devclass_get_maxunit(pcm_devclass); i++) {
d = devclass_get_softc(pcm_devclass, i);
if (d == NULL)
continue;
/* See the note in function docblock */
mtx_assert(d->lock, MA_NOTOWNED);
pcm_inprog(d, 1);
pcm_lock(d);
SLIST_FOREACH(sce, &d->channels, link) {
ch = sce->channel;
mtx_assert(ch->lock, MA_NOTOWNED);
CHN_LOCK(ch);
if (ai->dev == -1) {
if ((ch == i_dev->si_drv1) || /* record ch */
(ch == i_dev->si_drv2)) { /* playback ch */
t_cdev = i_dev;
goto dspfound;
}
} else if (ai->dev == nchan) {
t_cdev = sce->dsp_devt;
goto dspfound;
}
CHN_UNLOCK(ch);
++nchan;
}
pcm_unlock(d);
pcm_inprog(d, -1);
}
/* Exhausted the search -- nothing is locked, so return. */
return EINVAL;
dspfound:
/* Should've found the device, but something isn't right */
if (t_cdev == NULL) {
ret = EINVAL;
goto out;
}
/*
* At this point, the following synchronization stuff has happened:
* - a specific PCM device is locked and its "in progress
* operations" counter has been incremented, so be sure to unlock
* and decrement when exiting;
* - a specific audio channel has been locked, so be sure to unlock
* when exiting;
*/
caps = chn_getcaps(ch);
/*
* With all handles collected, zero out the user's container and
* begin filling in its fields.
*/
bzero((void *)ai, sizeof(oss_audioinfo));
ai->dev = nchan;
strlcpy(ai->name, ch->name, sizeof(ai->name));
if ((ch->flags & CHN_F_BUSY) == 0)
ai->busy = 0;
else
ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
/**
* @note
* @c cmd - OSSv4 docs: "Only supported under Linux at this moment."
* Cop-out, I know, but I'll save running around in the process
* table for later. Is there a risk of leaking information?
*/
ai->pid = ch->pid;
/*
* These flags stolen from SNDCTL_DSP_GETCAPS handler. Note, however,
* that a single channel operates in only one direction, so
* DSP_CAP_DUPLEX is out.
*/
/**
* @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep these in
* pcmchan::caps?
*/
ai->caps = DSP_CAP_REALTIME | DSP_CAP_MMAP | DSP_CAP_TRIGGER;
/*
* Collect formats supported @b natively by the device. Also
* determine min/max channels. (I.e., mono, stereo, or both?)
*
* If any channel is stereo, maxch = 2;
* if all channels are stereo, minch = 2, too;
* if any channel is mono, minch = 1;
* and if all channels are mono, maxch = 1.
*/
minch = 0;
maxch = 0;
fmts = 0;
for (i = 0; caps->fmtlist[i]; i++) {
fmts |= caps->fmtlist[i];
if (caps->fmtlist[i] & AFMT_STEREO) {
minch = (minch == 0) ? 2 : minch;
maxch = 2;
} else {
minch = 1;
maxch = (maxch == 0) ? 1 : maxch;
}
}
if (ch->direction == PCMDIR_PLAY)
ai->oformats = fmts;
else
ai->iformats = fmts;
/**
* @note
* @c magic - OSSv4 docs: "Reserved for internal use by OSS."
*
* @par
* @c card_number - OSSv4 docs: "Number of the sound card where this
* device belongs or -1 if this information is not available.
* Applications should normally not use this field for any
* purpose."
*/
ai->card_number = -1;
/**
* @todo @c song_name - depends first on SNDCTL_[GS]ETSONG
* @todo @c label - depends on SNDCTL_[GS]ETLABEL
* @todo @c port_number - routing information?
*/
ai->port_number = -1;
ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
/**
* @note
* @c real_device - OSSv4 docs: "Obsolete."
*/
ai->real_device = -1;
strlcpy(ai->devnode, t_cdev->si_name, sizeof(ai->devnode));
ai->enabled = device_is_attached(d->dev) ? 1 : 0;
/**
* @note
* @c flags - OSSv4 docs: "Reserved for future use."
*
* @note
* @c binding - OSSv4 docs: "Reserved for future use."
*
* @todo @c handle - haven't decided how to generate this yet; bus,
* vendor, device IDs?
*/
ai->min_rate = caps->minspeed;
ai->max_rate = caps->maxspeed;
ai->min_channels = minch;
ai->max_channels = maxch;
ai->nrates = chn_getrates(ch, &rates);
if (ai->nrates > OSS_MAX_SAMPLE_RATES)
ai->nrates = OSS_MAX_SAMPLE_RATES;
for (i = 0; i < ai->nrates; i++)
ai->rates[i] = rates[i];
out:
CHN_UNLOCK(ch);
pcm_unlock(d);
pcm_inprog(d, -1);
return ret;
}
/**
* @brief Assigns a PCM channel to a sync group.
*
* Sync groups are used to enable audio operations on multiple devices
* simultaneously. They may be used with any number of devices and may
* span across applications. Devices are added to groups with
* the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
* SNDCTL_DSP_SYNCSTART ioctl.
*
* If the @c id field of the @c group parameter is set to zero, then a new
* sync group is created. Otherwise, wrch and rdch (if set) are added to
* the group specified.
*
* @todo As far as memory allocation, should we assume that things are
* okay and allocate with M_WAITOK before acquiring channel locks,
* freeing later if not?
*
* @param wrch output channel associated w/ device (if any)
* @param rdch input channel associated w/ device (if any)
* @param group Sync group parameters
*
* @retval 0 success
* @retval non-zero error to be propagated upstream
*/
static int
dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
{
struct pcmchan_syncmember *smrd, *smwr;
struct pcmchan_syncgroup *sg;
int ret, sg_ids[3];
smrd = NULL;
smwr = NULL;
sg = NULL;
ret = 0;
/*
* Free_unr() may sleep, so store released syncgroup IDs until after
* all locks are released.
*/
sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
PCM_SG_LOCK();
/*
* - Insert channel(s) into group's member list.
* - Set CHN_F_NOTRIGGER on channel(s).
* - Stop channel(s).
*/
/*
* If device's channels are already mapped to a group, unmap them.
*/
if (wrch) {
CHN_LOCK(wrch);
sg_ids[0] = chn_syncdestroy(wrch);
}
if (rdch) {
CHN_LOCK(rdch);
sg_ids[1] = chn_syncdestroy(rdch);
}
/*
* Verify that mode matches character device properites.
* - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
* - Bail if PCM_ENABLE_INPUT && rdch == NULL.
*/
if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
ret = EINVAL;
goto out;
}
/*
* An id of zero indicates the user wants to create a new
* syncgroup.
*/
if (group->id == 0) {
sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
if (sg != NULL) {
SLIST_INIT(&sg->members);
sg->id = alloc_unr(pcmsg_unrhdr);
group->id = sg->id;
SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
} else
ret = ENOMEM;
} else {
SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
if (sg->id == group->id)
break;
}
if (sg == NULL)
ret = EINVAL;
}
/* Couldn't create or find a syncgroup. Fail. */
if (sg == NULL)
goto out;
/*
* Allocate a syncmember, assign it and a channel together, and
* insert into syncgroup.
*/
if (group->mode & PCM_ENABLE_INPUT) {
smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
if (smrd == NULL) {
ret = ENOMEM;
goto out;
}
SLIST_INSERT_HEAD(&sg->members, smrd, link);
smrd->parent = sg;
smrd->ch = rdch;
chn_abort(rdch);
rdch->flags |= CHN_F_NOTRIGGER;
rdch->sm = smrd;
}
if (group->mode & PCM_ENABLE_OUTPUT) {
smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
if (smwr == NULL) {
ret = ENOMEM;
goto out;
}
SLIST_INSERT_HEAD(&sg->members, smwr, link);
smwr->parent = sg;
smwr->ch = wrch;
chn_abort(wrch);
wrch->flags |= CHN_F_NOTRIGGER;
wrch->sm = smwr;
}
out:
if (ret != 0) {
if (smrd != NULL)
free(smrd, M_DEVBUF);
if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
sg_ids[2] = sg->id;
SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
free(sg, M_DEVBUF);
}
if (wrch)
wrch->sm = NULL;
if (rdch)
rdch->sm = NULL;
}
if (wrch)
CHN_UNLOCK(wrch);
if (rdch)
CHN_UNLOCK(rdch);
PCM_SG_UNLOCK();
if (sg_ids[0])
free_unr(pcmsg_unrhdr, sg_ids[0]);
if (sg_ids[1])
free_unr(pcmsg_unrhdr, sg_ids[1]);
if (sg_ids[2])
free_unr(pcmsg_unrhdr, sg_ids[2]);
return ret;
}
/**
* @brief Launch a sync group into action
*
* Sync groups are established via SNDCTL_DSP_SYNCGROUP. This function
* iterates over all members, triggering them along the way.
*
* @note Caller must not hold any channel locks.
*
* @param sg_id sync group identifier
*
* @retval 0 success
* @retval non-zero error worthy of propagating upstream to user
*/
static int
dsp_oss_syncstart(int sg_id)
{
struct pcmchan_syncmember *sm, *sm_tmp;
struct pcmchan_syncgroup *sg;
struct pcm_channel *c;
int ret, needlocks;
/* Get the synclists lock */
PCM_SG_LOCK();
do {
ret = 0;
needlocks = 0;
/* Search for syncgroup by ID */
SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
if (sg->id == sg_id)
break;
}
/* Return EINVAL if not found */
if (sg == NULL) {
ret = EINVAL;
break;
}
/* Any removals resulting in an empty group should've handled this */
KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
/*
* Attempt to lock all member channels - if any are already
* locked, unlock those acquired, sleep for a bit, and try
* again.
*/
SLIST_FOREACH(sm, &sg->members, link) {
if (CHN_TRYLOCK(sm->ch) == 0) {
int timo = hz * 5/1000;
if (timo < 1)
timo = 1;
/* Release all locked channels so far, retry */
SLIST_FOREACH(sm_tmp, &sg->members, link) {
/* sm is the member already locked */
if (sm == sm_tmp)
break;
CHN_UNLOCK(sm_tmp->ch);
}
/** @todo Is PRIBIO correct/ */
ret = msleep(sm, &snd_pcm_syncgroups_mtx, PRIBIO | PCATCH, "pcmsgrp", timo);
if (ret == EINTR || ret == ERESTART)
break;
needlocks = 1;
ret = 0; /* Assumes ret == EWOULDBLOCK... */
}
}
} while (needlocks && ret == 0);
/* Proceed only if no errors encountered. */
if (ret == 0) {
/* Launch channels */
while((sm = SLIST_FIRST(&sg->members)) != NULL) {
SLIST_REMOVE_HEAD(&sg->members, link);
c = sm->ch;
c->sm = NULL;
chn_start(c, 1);
c->flags &= ~CHN_F_NOTRIGGER;
CHN_UNLOCK(c);
free(sm, M_DEVBUF);
}
SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
free(sg, M_DEVBUF);
}
PCM_SG_UNLOCK();
/*
* Free_unr() may sleep, so be sure to give up the syncgroup lock
* first.
*/
if (ret == 0)
free_unr(pcmsg_unrhdr, sg_id);
return ret;
}
/**
* @brief Handler for SNDCTL_DSP_POLICY
*
* The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
* size and count like with SNDCTL_DSP_SETFRAGMENT. Instead of the user
* specifying those two parameters, s/he simply selects a number from 0..10
* which corresponds to a buffer size. Smaller numbers request smaller
* buffers with lower latencies (at greater overhead from more frequent
* interrupts), while greater numbers behave in the opposite manner.
*
* The 4Front spec states that a value of 5 should be the default. However,
* this implementation deviates slightly by using a linear scale without
* consulting drivers. I.e., even though drivers may have different default
* buffer sizes, a policy argument of 5 will have the same result across
* all drivers.
*
* See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
* more information.
*
* @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
* work with hardware drivers directly.
*
* @note PCM channel arguments must not be locked by caller.
*
* @param wrch Pointer to opened playback channel (optional; may be NULL)
* @param rdch " recording channel (optional; may be NULL)
* @param policy Integer from [0:10]
*
* @retval 0 constant (for now)
*/
static int
dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
{
int ret;
if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
return EIO;
/* Default: success */
ret = 0;
if (rdch) {
CHN_LOCK(rdch);
ret = chn_setlatency(rdch, policy);
CHN_UNLOCK(rdch);
}
if (wrch && ret == 0) {
CHN_LOCK(wrch);
ret = chn_setlatency(wrch, policy);
CHN_UNLOCK(wrch);
}
if (ret)
ret = EIO;
return ret;
}
#ifdef OSSV4_EXPERIMENT
/**
* @brief Enable or disable "cooked" mode
*
* This is a handler for @c SNDCTL_DSP_COOKEDMODE. When in cooked mode, which
* is the default, the sound system handles rate and format conversions
* automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
* operates with 44100Hz/16bit/signed samples).
*
* Disabling cooked mode is intended for applications wanting to mmap()
* a sound card's buffer space directly, bypassing the FreeBSD 2-stage
* feeder architecture, presumably to gain as much control over audio
* hardware as possible.
*
* See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
* for more details.
*
* @note Currently, this function is just a stub that always returns EINVAL.
*
* @todo Figure out how to and actually implement this.
*
* @param wrch playback channel (optional; may be NULL)
* @param rdch recording channel (optional; may be NULL)
* @param enabled 0 = raw mode, 1 = cooked mode
*
* @retval EINVAL Operation not yet supported.
*/
static int
dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
{
return EINVAL;
}
/**
* @brief Retrieve channel interleaving order
*
* This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
*
* See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
* for more details.
*
* @note As the ioctl definition is still under construction, FreeBSD
* does not currently support SNDCTL_DSP_GET_CHNORDER.
*
* @param wrch playback channel (optional; may be NULL)
* @param rdch recording channel (optional; may be NULL)
* @param map channel map (result will be stored there)
*
* @retval EINVAL Operation not yet supported.
*/
static int
dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
{
return EINVAL;
}
/**
* @brief Specify channel interleaving order
*
* This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
*
* @note As the ioctl definition is still under construction, FreeBSD
* does not currently support @c SNDCTL_DSP_SET_CHNORDER.
*
* @param wrch playback channel (optional; may be NULL)
* @param rdch recording channel (optional; may be NULL)
* @param map channel map
*
* @retval EINVAL Operation not yet supported.
*/
static int
dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
{
return EINVAL;
}
/**
* @brief Retrieve an audio device's label
*
* This is a handler for the @c SNDCTL_GETLABEL ioctl.
*
* See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
* for more details.
*
* From Hannu@4Front: "For example ossxmix (just like some HW mixer
* consoles) can show variable "labels" for certain controls. By default
* the application name (say quake) is shown as the label but
* applications may change the labels themselves."
*
* @note As the ioctl definition is still under construction, FreeBSD
* does not currently support @c SNDCTL_GETLABEL.
*
* @param wrch playback channel (optional; may be NULL)
* @param rdch recording channel (optional; may be NULL)
* @param label label gets copied here
*
* @retval EINVAL Operation not yet supported.
*/
static int
dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
{
return EINVAL;
}
/**
* @brief Specify an audio device's label
*
* This is a handler for the @c SNDCTL_SETLABEL ioctl. Please see the
* comments for @c dsp_oss_getlabel immediately above.
*
* See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
* for more details.
*
* @note As the ioctl definition is still under construction, FreeBSD
* does not currently support SNDCTL_SETLABEL.
*
* @param wrch playback channel (optional; may be NULL)
* @param rdch recording channel (optional; may be NULL)
* @param label label gets copied from here
*
* @retval EINVAL Operation not yet supported.
*/
static int
dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
{
return EINVAL;
}
/**
* @brief Retrieve name of currently played song
*
* This is a handler for the @c SNDCTL_GETSONG ioctl. Audio players could
* tell the system the name of the currently playing song, which would be
* visible in @c /dev/sndstat.
*
* See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
* for more details.
*
* @note As the ioctl definition is still under construction, FreeBSD
* does not currently support SNDCTL_GETSONG.
*
* @param wrch playback channel (optional; may be NULL)
* @param rdch recording channel (optional; may be NULL)
* @param song song name gets copied here
*
* @retval EINVAL Operation not yet supported.
*/
static int
dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
{
return EINVAL;
}
/**
* @brief Retrieve name of currently played song
*
* This is a handler for the @c SNDCTL_SETSONG ioctl. Audio players could
* tell the system the name of the currently playing song, which would be
* visible in @c /dev/sndstat.
*
* See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
* for more details.
*
* @note As the ioctl definition is still under construction, FreeBSD
* does not currently support SNDCTL_SETSONG.
*
* @param wrch playback channel (optional; may be NULL)
* @param rdch recording channel (optional; may be NULL)
* @param song song name gets copied from here
*
* @retval EINVAL Operation not yet supported.
*/
static int
dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
{
return EINVAL;
}
/**
* @brief Rename a device
*
* This is a handler for the @c SNDCTL_SETNAME ioctl.
*
* See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
* more details.
*
* From Hannu@4Front: "This call is used to change the device name
* reported in /dev/sndstat and ossinfo. So instead of using some generic
* 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
* name depending on the current context (for example 'OSS virtual wave table
* synth' or 'VoIP link to London')."
*
* @note As the ioctl definition is still under construction, FreeBSD
* does not currently support SNDCTL_SETNAME.
*
* @param wrch playback channel (optional; may be NULL)
* @param rdch recording channel (optional; may be NULL)
* @param name new device name gets copied from here
*
* @retval EINVAL Operation not yet supported.
*/
static int
dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
{
return EINVAL;
}
#endif /* !OSSV4_EXPERIMENT */
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