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freebsd-nq/sys/dev/sound/pcm/dsp.c
Ariff Abdullah ee43f8a667 From luigi: 
In SNDCTL_DSP_SETFRAGMENT, if you specify both read and
	write channels, the existing code first acts on the
	read channel, but as a side effect it updates the
	arguments (maxfrags, fragsz) passed by the caller according
	to acceptable values for the read channel, and then uses the
	modified values to act on the write channel.
	The problem with this approach is that, given a
	(maxfrags, fragsz) user-specified value, the actual
	values computed by the read and write channels may differ:
	e.g. the read channel might want to allocate more fragments
	than what the user specified because it has no side-effects
	on the delay and it helps in case of slow readers,
	whereas the write channel needs to use as few fragments
	as possible to keep the audio latency low (very important
	with telephony apps).

	This patch stores the values computed by the read channel
	into temproary variables so the write channel will use
	the actual arguments of the ioctl.

	This patch is very helpful with telephony apps such as asterisk.

Submitted by:	luigi
Approved by:	netchild (mentor)
2005-11-14 18:20:47 +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;
u_int32_t fmt;
int devtype;
int rdref;
int error;
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) {
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);
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);
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);
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 */
return EBUSY;
}
/* got a channel, already locked for us */
if (chn_reset(rdch, fmt)) {
pcm_chnrelease(rdch);
i_dev->si_drv1 = NULL;
return ENODEV;
}
pcm_lock(d);
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 */
pcm_unlock(d);
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;
pcm_lock(d);
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);
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);
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;
d = dsp_get_info(i_dev);
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) {
pcm_lock(d);
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);
}
}
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;
ret = chn_write(wrch, buf);
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;
/*
* 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);
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 ? */
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 (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;
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;
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);
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);
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);
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);
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;
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 != 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
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