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freebsd-skq/sys/dev/sound/pcm/dsp.c
Poul-Henning Kamp f4f6abcb4e Explicitly hold a reference to the cdev we have just cloned. This 
closes the race where the cdev was reclaimed before it ever made it
back to devfs lookup.
2005-03-31 12:19:44 +00:00

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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 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 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;
intrmask_t s;
u_int32_t fmt;
int devtype;
int rdref;
int error;
s = spltty();
d = dsp_get_info(i_dev);
devtype = PCMDEV(i_dev);
/* 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_DSPREC:
fmt = AFMT_U8;
if (mode & FWRITE) {
splx(s);
return EINVAL;
}
break;
default:
panic("impossible devtype %d", devtype);
}
rdref = 0;
/* lock snddev so nobody else can monkey with it */
pcm_lock(d);
rdch = i_dev->si_drv1;
wrch = i_dev->si_drv2;
if ((dsp_get_flags(i_dev) & SD_F_SIMPLEX) && (rdch || wrch)) {
/* we're a simplex device and already open, no go */
pcm_unlock(d);
splx(s);
return EBUSY;
}
if (((flags & FREAD) && rdch) || ((flags & FWRITE) && wrch)) {
/*
* device already open in one or both directions that
* the opener wants; we can't handle this.
*/
pcm_unlock(d);
splx(s);
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 */
if (devtype == SND_DEV_DSPREC)
rdch = pcm_chnalloc(d, PCMDIR_REC, td->td_proc->p_pid, PCMCHAN(i_dev));
else
rdch = pcm_chnalloc(d, PCMDIR_REC, td->td_proc->p_pid, -1);
if (!rdch) {
/* no channel available, exit */
pcm_unlock(d);
splx(s);
return EBUSY;
}
/* got a channel, already locked for us */
if (chn_reset(rdch, fmt)) {
pcm_chnrelease(rdch);
i_dev->si_drv1 = NULL;
pcm_unlock(d);
splx(s);
return ENODEV;
}
if (flags & O_NONBLOCK)
rdch->flags |= CHN_F_NBIO;
pcm_chnref(rdch, 1);
CHN_UNLOCK(rdch);
rdref = 1;
/*
* Record channel created, ref'ed and unlocked
*/
}
if (flags & FWRITE) {
/* open for write */
wrch = pcm_chnalloc(d, PCMDIR_PLAY, td->td_proc->p_pid, -1);
error = 0;
if (!wrch)
error = EBUSY; /* XXX Right return code? */
else if (chn_reset(wrch, fmt))
error = ENODEV;
if (error != 0) {
if (wrch) {
/*
* Free play channel
*/
pcm_chnrelease(wrch);
i_dev->si_drv2 = NULL;
}
if (rdref) {
/*
* Lock, deref and release previously created record channel
*/
CHN_LOCK(rdch);
pcm_chnref(rdch, -1);
pcm_chnrelease(rdch);
i_dev->si_drv1 = NULL;
}
pcm_unlock(d);
splx(s);
return error;
}
if (flags & O_NONBLOCK)
wrch->flags |= CHN_F_NBIO;
pcm_chnref(wrch, 1);
CHN_UNLOCK(wrch);
}
i_dev->si_drv1 = rdch;
i_dev->si_drv2 = wrch;
pcm_unlock(d);
splx(s);
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;
intrmask_t s;
int refs;
s = spltty();
d = dsp_get_info(i_dev);
pcm_lock(d);
rdch = i_dev->si_drv1;
wrch = i_dev->si_drv2;
refs = 0;
if (rdch) {
CHN_LOCK(rdch);
refs += pcm_chnref(rdch, -1);
CHN_UNLOCK(rdch);
}
if (wrch) {
CHN_LOCK(wrch);
refs += pcm_chnref(wrch, -1);
CHN_UNLOCK(wrch);
}
/*
* If there are no more references, release the channels.
*/
if ((rdch || wrch) && refs == 0) {
if (pcm_getfakechan(d))
pcm_getfakechan(d)->flags = 0;
i_dev->si_drv1 = NULL;
i_dev->si_drv2 = NULL;
dsp_set_flags(i_dev, dsp_get_flags(i_dev) & ~SD_F_TRANSIENT);
pcm_unlock(d);
if (rdch) {
CHN_LOCK(rdch);
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) {
CHN_LOCK(wrch);
/*
* XXX: Maybe the right behaviour is to abort on non_block.
* It seems that mplayer flushes the audio queue by quickly
* closing and re-opening. In FBSD, there's a long pause
* while the audio queue flushes that I presume isn't there in
* linux.
*/
chn_flush(wrch); /* may sleep */
wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MAPPED | CHN_F_DEAD);
chn_reset(wrch, 0);
pcm_chnrelease(wrch);
}
} else
pcm_unlock(d);
splx(s);
return 0;
}
static int
dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
{
struct pcm_channel *rdch, *wrch;
intrmask_t s;
int ret;
s = spltty();
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);
splx(s);
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);
splx(s);
return ret;
}
static int
dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
{
struct pcm_channel *rdch, *wrch;
intrmask_t s;
int ret;
s = spltty();
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);
splx(s);
return EINVAL;
}
if (!(wrch->flags & CHN_F_RUNNING))
wrch->flags |= CHN_F_RUNNING;
ret = chn_write(wrch, buf);
relchns(i_dev, rdch, wrch, SD_F_PRIO_WR);
splx(s);
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;
intrmask_t s;
int kill;
int ret = 0, *arg_i = (int *)arg, tmp;
/*
* 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')
return mixer_ioctl(d->mixer_dev, cmd, arg, mode, td);
s = spltty();
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);
splx(s);
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 ? */
CHN_LOCK(wrch);
/*
if (wrch && wrch->bufhard.dl)
while (chn_wrfeed(wrch) == 0);
*/
*arg_i = wrch? sndbuf_getfree(wrch->bufsoft) : 0;
CHN_UNLOCK(wrch);
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 (wrch) {
CHN_LOCK(wrch);
if (cmd == AIOSFMT) {
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) {
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;
break;
case FIOASYNC: /*set/clear async i/o */
DEB( printf("FIOASYNC\n") ; )
break;
case SNDCTL_DSP_NONBLOCK:
case FIONBIO: /* set/clear non-blocking i/o */
if (rdch) {
CHN_LOCK(rdch);
if (*arg_i)
rdch->flags |= CHN_F_NBIO;
else
rdch->flags &= ~CHN_F_NBIO;
CHN_UNLOCK(rdch);
}
if (wrch) {
CHN_LOCK(wrch);
if (*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;
CHN_LOCK(chn);
*arg_i = sndbuf_getblksz(chn->bufsoft);
CHN_UNLOCK(chn);
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, sndbuf_getsize(wrch->bufsoft) - 4);
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;
CHN_LOCK(chn);
*arg_i = chn->speed;
CHN_UNLOCK(chn);
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;
CHN_LOCK(chn);
*arg_i = (chn->format & AFMT_STEREO) ? 2 : 1;
CHN_UNLOCK(chn);
break;
case SNDCTL_DSP_GETFMTS: /* returns a mask of supported fmts */
chn = wrch ? wrch : rdch;
CHN_LOCK(chn);
*arg_i = chn_getformats(chn);
CHN_UNLOCK(chn);
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;
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);
maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
fragsz = sndbuf_getblksz(rdch->bufsoft);
CHN_UNLOCK(rdch);
}
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);
}
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);
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);
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);
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;
CHN_LOCK(chn);
*arg_i = (chn->format & AFMT_16BIT) ? 16 : 8;
CHN_UNLOCK(chn);
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 *b = wrch->bufhard;
struct snd_dbuf *bs = wrch->bufsoft;
CHN_LOCK(wrch);
chn_wrupdate(wrch);
*arg_i = sndbuf_getready(b) + 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;
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);
splx(s);
return ret;
}
static int
dsp_poll(struct cdev *i_dev, int events, struct thread *td)
{
struct pcm_channel *wrch = NULL, *rdch = NULL;
intrmask_t s;
int ret, e;
s = spltty();
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);
splx(s);
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;
intrmask_t s;
if (nprot & PROT_EXEC)
return -1;
s = spltty();
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 {
splx(s);
return -1;
}
#else
c = wrch;
#endif
if (c == NULL) {
relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
splx(s);
return -1;
}
if (offset >= sndbuf_getsize(c->bufsoft)) {
relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
splx(s);
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);
splx(s);
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, char *name, int namelen, struct cdev **dev)
{
struct cdev *pdev;
struct snddev_info *pcm_dev;
struct snddev_channel *pcm_chan;
int i, unit, devtype;
int devtypes[3] = {SND_DEV_DSP, SND_DEV_DSP16, SND_DEV_AUDIO};
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->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
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