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freebsd-skq/sys/dev/pcm/dsp.c
cg f1bbb0150a * add a non-reset device- will not reset the channel on open. you 
will have to mknod yourself for now.
* don't eat the first write()
* partial rvplayer fix- don't panic on unaligned writes unless our
  feeder chain requires them for downconversion.  a fuller fix is
  on the way.
1999-09-28 21:43:35 +00:00

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/*
* Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk>
* 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/kernel.h>
#include <dev/pcm/sound.h>
static int getchns(snddev_info *d, int chan, pcm_channel **rdch, pcm_channel **wrch);
static pcm_channel *
allocchn(snddev_info *d, int direction)
{
pcm_channel *chns = (direction == PCMDIR_PLAY)? d->play : d->rec;
int i, cnt = (direction == PCMDIR_PLAY)? d->playcount : d->reccount;
for (i = 0; i < cnt; i++) {
if (!(chns[i].flags & CHN_F_BUSY)) {
chns[i].flags |= CHN_F_BUSY;
return &chns[i];
}
}
return NULL;
}
static int
getchns(snddev_info *d, int chan, pcm_channel **rdch, pcm_channel **wrch)
{
if ((d->flags & SD_F_PRIO_SET) == SD_F_PRIO_SET)
panic("read and write both prioritised");
if (d->flags & SD_F_SIMPLEX) {
*rdch = (d->flags & SD_F_PRIO_RD)? d->arec[chan] : &d->fakechan;
*wrch = (d->flags & SD_F_PRIO_WR)? d->aplay[chan] : &d->fakechan;
} else {
*rdch = d->arec[chan];
*wrch = d->aplay[chan];
}
return 0;
}
static void
setchns(snddev_info *d, int chan)
{
if ((d->flags & SD_F_PRIO_SET) == SD_F_PRIO_SET)
panic("read and write both prioritised");
d->flags |= SD_F_DIR_SET;
if (d->flags & SD_F_EVILSB16) {
if ((d->flags & SD_F_PRIO_RD) && (d->aplay[chan])) {
pcm_channel *tmp;
tmp = d->arec[chan];
d->arec[chan] = d->aplay[chan];
d->aplay[chan] = tmp;
}
if (d->aplay[chan]) chn_setdir(d->aplay[chan], PCMDIR_PLAY);
if (d->arec[chan]) chn_setdir(d->arec[chan], PCMDIR_REC);
}
}
int
dsp_open(snddev_info *d, int chan, int oflags, int devtype)
{
pcm_channel *rdch = NULL, *wrch = NULL;
u_int32_t fmt;
if (chan >= d->chancount) return ENODEV;
if (d->aplay[chan] || d->arec[chan]) return EBUSY;
if (oflags & FREAD) {
rdch = allocchn(d, PCMDIR_REC);
if (!rdch) return EBUSY;
}
if (oflags & FWRITE) {
wrch = allocchn(d, PCMDIR_PLAY);
if (!wrch) {
if (rdch) rdch->flags &= ~CHN_F_BUSY;
return EBUSY;
}
}
d->aplay[chan] = wrch;
d->arec[chan] = rdch;
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;
default:
return ENXIO;
}
if (rdch) {
chn_reset(rdch);
if (oflags & O_NONBLOCK) rdch->flags |= CHN_F_NBIO;
if (fmt) {
rdch->volume = (100 << 8) | 100;
rdch->format = fmt;
rdch->speed = DSP_DEFAULT_SPEED;
rdch->blocksize = 2048;
}
}
if (wrch) {
chn_reset(wrch);
if (oflags & O_NONBLOCK) wrch->flags |= CHN_F_NBIO;
if (fmt) {
wrch->volume = (100 << 8) | 100;
wrch->format = fmt;
wrch->speed = DSP_DEFAULT_SPEED;
wrch->blocksize = 2048;
}
}
return 0;
}
int
dsp_close(snddev_info *d, int chan, int devtype)
{
pcm_channel *rdch, *wrch;
d->flags &= ~SD_F_TRANSIENT;
rdch = d->arec[chan];
wrch = d->aplay[chan];
if (rdch) {
chn_abort(rdch);
rdch->flags &= ~(CHN_F_BUSY | CHN_F_RUNNING | CHN_F_MAPPED);
}
if (wrch) wrch->flags &= ~(CHN_F_BUSY | CHN_F_RUNNING | CHN_F_MAPPED);
d->aplay[chan] = NULL;
d->arec[chan] = NULL;
return 0;
}
int
dsp_read(snddev_info *d, int chan, struct uio *buf, int flag)
{
pcm_channel *rdch, *wrch;
if (!(d->flags & SD_F_PRIO_SET)) d->flags |= SD_F_PRIO_RD;
if (!(d->flags & SD_F_DIR_SET)) setchns(d, chan);
getchns(d, chan, &rdch, &wrch);
if (!rdch || !(rdch->flags & CHN_F_BUSY))
panic("dsp_read: non%s channel", rdch? "busy" : "existant");
if (rdch->flags & CHN_F_MAPPED) return EINVAL;
if (!(rdch->flags & CHN_F_RUNNING)) {
rdch->flags |= CHN_F_RUNNING;
chn_reinit(rdch);
}
return chn_read(rdch, buf);
}
int
dsp_write(snddev_info *d, int chan, struct uio *buf, int flag)
{
pcm_channel *rdch, *wrch;
if (!(d->flags & SD_F_PRIO_SET)) d->flags |= SD_F_PRIO_WR;
if (!(d->flags & SD_F_DIR_SET)) setchns(d, chan);
getchns(d, chan, &rdch, &wrch);
if (!wrch || !(wrch->flags & CHN_F_BUSY))
panic("dsp_write: non%s channel", wrch? "busy" : "existant");
if (wrch->flags & CHN_F_MAPPED) return EINVAL;
if (!(wrch->flags & CHN_F_RUNNING)) {
wrch->flags |= CHN_F_RUNNING;
chn_reinit(wrch);
}
return chn_write(wrch, buf);
}
int
dsp_ioctl(snddev_info *d, int chan, u_long cmd, caddr_t arg)
{
int ret = 0, *arg_i = (int *)arg;
u_long s;
pcm_channel *wrch = NULL, *rdch = NULL;
getchns(d, chan, &rdch, &wrch);
/*
* all routines are called with int. blocked. Make sure that
* ints are re-enabled when calling slow or blocking functions!
*/
s = spltty();
switch(cmd) {
/*
* we start with the new ioctl interface.
*/
case AIONWRITE: /* how many bytes can write ? */
if (wrch && wrch->buffer.dl) chn_dmaupdate(wrch);
*arg_i = wrch? wrch->buffer.fl : 0;
break;
case AIOSSIZE: /* set the current blocksize */
{
struct snd_size *p = (struct snd_size *)arg;
splx(s);
if (wrch) chn_setblocksize(wrch, p->play_size);
if (rdch) chn_setblocksize(rdch, p->rec_size);
}
/* FALLTHROUGH */
case AIOGSIZE: /* get the current blocksize */
{
struct snd_size *p = (struct snd_size *)arg;
if (wrch) p->play_size = wrch->blocksize;
if (rdch) p->rec_size = rdch->blocksize;
}
break;
case AIOSFMT:
{
snd_chan_param *p = (snd_chan_param *)arg;
splx(s);
if (wrch) {
chn_setformat(wrch, p->play_format);
chn_setspeed(wrch, p->play_rate);
}
if (rdch) {
chn_setformat(rdch, p->rec_format);
chn_setspeed(rdch, p->rec_rate);
}
}
/* FALLTHROUGH */
case AIOGFMT:
{
snd_chan_param *p = (snd_chan_param *)arg;
p->play_rate = wrch? wrch->speed : 0;
p->rec_rate = rdch? rdch->speed : 0;
p->play_format = wrch? wrch->format : 0;
p->rec_format = rdch? rdch->format : 0;
}
break;
case AIOGCAP: /* get capabilities */
{
snd_capabilities *p = (snd_capabilities *)arg;
pcmchan_caps *pcaps = NULL, *rcaps = NULL;
if (rdch) rcaps = chn_getcaps(rdch);
if (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? rdch->buffer.bufsize : 1000000,
wrch? wrch->buffer.bufsize : 1000000);
/* XXX bad on sb16 */
p->formats = (rcaps? rcaps->formats : 0xffffffff) &
(pcaps? pcaps->formats : 0xffffffff);
p->mixers = 1; /* default: one mixer */
p->inputs = d->mixer.devs;
p->left = p->right = 100;
}
break;
case AIOSTOP:
if (*arg_i == AIOSYNC_PLAY && wrch) *arg_i = chn_abort(wrch);
else if (*arg_i == AIOSYNC_CAPTURE && rdch) *arg_i = chn_abort(rdch);
else {
splx(s);
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;
/*
* here follow the standard ioctls (filio.h etc.)
*/
case FIONREAD: /* get # bytes to read */
if (rdch && rdch->buffer.dl) chn_dmaupdate(rdch);
*arg_i = rdch? rdch->buffer.rl : 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) rdch->flags &= ~CHN_F_NBIO;
if (wrch) wrch->flags &= ~CHN_F_NBIO;
if (*arg_i) {
if (rdch) rdch->flags |= CHN_F_NBIO;
if (wrch) wrch->flags |= CHN_F_NBIO;
}
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:
*arg_i = wrch? wrch->blocksize : 0; /* XXX rdch? */
break ;
case SNDCTL_DSP_SETBLKSIZE:
splx(s);
if (wrch) chn_setblocksize(wrch, *arg_i);
if (rdch) chn_setblocksize(rdch, *arg_i);
break;
case SNDCTL_DSP_RESET:
DEB(printf("dsp reset\n"));
if (wrch) chn_abort(wrch);
if (rdch) chn_abort(rdch);
break;
case SNDCTL_DSP_SYNC:
DEB(printf("dsp sync\n"));
splx(s);
if (wrch) chn_sync(wrch, wrch->buffer.bufsize - 4);
break;
case SNDCTL_DSP_SPEED:
splx(s);
if (wrch) chn_setspeed(wrch, *arg_i);
if (rdch) chn_setspeed(rdch, *arg_i);
/* fallthru */
case SOUND_PCM_READ_RATE:
*arg_i = wrch? wrch->speed : rdch->speed;
break;
case SNDCTL_DSP_STEREO:
splx(s);
if (wrch) chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) |
((*arg_i)? AFMT_STEREO : 0));
if (rdch) chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) |
((*arg_i)? AFMT_STEREO : 0));
*arg_i = ((wrch? wrch->format : rdch->format) & AFMT_STEREO)? 1 : 0;
break;
case SOUND_PCM_WRITE_CHANNELS:
splx(s);
if (wrch) chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) |
((*arg_i == 2)? AFMT_STEREO : 0));
if (rdch) chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) |
((*arg_i == 2)? AFMT_STEREO : 0));
/* fallthru */
case SOUND_PCM_READ_CHANNELS:
*arg_i = ((wrch? wrch->format : rdch->format) & AFMT_STEREO)? 2 : 1;
break;
case SNDCTL_DSP_GETFMTS: /* returns a mask of supported fmts */
*arg_i = wrch? chn_getcaps(wrch)->formats : chn_getcaps(rdch)->formats;
break ;
case SNDCTL_DSP_SETFMT: /* sets _one_ format */
splx(s);
if (wrch) chn_setformat(wrch, *arg_i);
if (rdch) chn_setformat(rdch, *arg_i);
*arg_i = wrch? wrch->format : rdch->format;
break;
case SNDCTL_DSP_SUBDIVIDE:
/* XXX watch out, this is RW! */
DEB(printf("SNDCTL_DSP_SUBDIVIDE unimplemented\n");)
break;
case SNDCTL_DSP_SETFRAGMENT:
/* XXX watch out, this is RW! */
DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
{
int bytes = 1 << min(*arg_i & 0xffff, 16);
int count = (*arg_i >> 16) & 0xffff;
pcm_channel *c = wrch? wrch : rdch;
splx(s);
if (rdch) chn_setblocksize(rdch, bytes);
if (wrch) chn_setblocksize(wrch, bytes);
/* eg: 4dwave can only interrupt at buffer midpoint, so
* it will force blocksize == bufsize/2
*/
count = c->buffer.bufsize / c->blocksize;
bytes = ffs(c->blocksize) - 1;
*arg_i = (count << 16) | bytes;
}
break;
case SNDCTL_DSP_GETISPACE:
/* return space available in the input queue */
{
audio_buf_info *a = (audio_buf_info *)arg;
if (rdch) {
snd_dbuf *b = &rdch->buffer;
if (b->dl) chn_dmaupdate(rdch);
a->bytes = b->fl;
a->fragments = 1;
a->fragstotal = b->bufsize / rdch->blocksize;
a->fragsize = rdch->blocksize;
}
}
break;
case SNDCTL_DSP_GETOSPACE:
/* return space available in the output queue */
{
audio_buf_info *a = (audio_buf_info *)arg;
if (wrch) {
snd_dbuf *b = &wrch->buffer;
if (b->dl) chn_dmaupdate(wrch);
a->bytes = b->fl;
a->fragments = 1;
a->fragstotal = b->bufsize / wrch->blocksize;
a->fragsize = wrch->blocksize;
}
}
break;
case SNDCTL_DSP_GETIPTR:
{
count_info *a = (count_info *)arg;
if (rdch) {
snd_dbuf *b = &rdch->buffer;
if (b->dl) chn_dmaupdate(rdch);
a->bytes = b->total;
a->blocks = (b->total - b->prev_total) / rdch->blocksize;
a->ptr = b->fp;
b->prev_total += a->blocks * rdch->blocksize;
} else ret = EINVAL;
}
break;
case SNDCTL_DSP_GETOPTR:
{
count_info *a = (count_info *)arg;
if (wrch) {
snd_dbuf *b = &wrch->buffer;
if (b->dl) chn_dmaupdate(wrch);
a->bytes = b->total;
a->blocks = (b->total - b->prev_total) / wrch->blocksize;
a->ptr = b->rp;
b->prev_total += a->blocks * wrch->blocksize;
} else ret = EINVAL;
}
break;
case SNDCTL_DSP_GETCAPS:
*arg_i = DSP_CAP_REALTIME | DSP_CAP_MMAP | DSP_CAP_TRIGGER;
if (rdch && wrch && !(d->flags & SD_F_SIMPLEX))
*arg_i |= DSP_CAP_DUPLEX;
break;
case SOUND_PCM_READ_BITS:
*arg_i = ((wrch? wrch->format : rdch->format) & AFMT_16BIT)? 16 : 8;
break;
case SNDCTL_DSP_SETTRIGGER:
if (rdch) {
rdch->flags &= ~CHN_F_TRIGGERED;
if (*arg_i & PCM_ENABLE_INPUT)
rdch->flags |= CHN_F_TRIGGERED;
chn_intr(rdch);
}
if (wrch) {
wrch->flags &= ~CHN_F_TRIGGERED;
if (*arg_i & PCM_ENABLE_OUTPUT)
wrch->flags |= CHN_F_TRIGGERED;
chn_intr(wrch);
}
break;
case SNDCTL_DSP_GETTRIGGER:
*arg_i = 0;
if (wrch && wrch->flags & CHN_F_TRIGGERED)
*arg_i |= PCM_ENABLE_OUTPUT;
if (rdch && rdch->flags & CHN_F_TRIGGERED)
*arg_i |= PCM_ENABLE_INPUT;
break;
case SNDCTL_DSP_MAPINBUF:
case SNDCTL_DSP_MAPOUTBUF:
case SNDCTL_DSP_SETSYNCRO:
/* undocumented */
case SNDCTL_DSP_POST:
case SOUND_PCM_WRITE_FILTER:
case SOUND_PCM_READ_FILTER:
/* dunno what these do, don't sound important */
default:
DEB(printf("default ioctl snd%d fn 0x%08x fail\n", unit, cmd));
ret = EINVAL;
break;
}
splx(s);
return ret;
}
int
dsp_poll(snddev_info *d, int chan, int events, struct proc *p)
{
int ret = 0, e;
pcm_channel *wrch = NULL, *rdch = NULL;
getchns(d, chan, &rdch, &wrch);
e = events & (POLLOUT | POLLWRNORM);
if (wrch && e) ret |= chn_poll(wrch, e, p);
e = events & (POLLIN | POLLRDNORM);
if (rdch && e) ret |= chn_poll(rdch, e, p);
return ret;
}
int
dsp_mmap(snddev_info *d, int chan, vm_offset_t offset, int nprot)
{
pcm_channel *wrch = NULL, *rdch = NULL, *c = NULL;
getchns(d, chan, &rdch, &wrch);
/* XXX this is broken by line 204 of vm/device_pager.c, so force write buffer */
if (1 || (wrch && (nprot & PROT_WRITE))) c = wrch;
else if (rdch && (nprot & PROT_READ)) c = rdch;
if (c) {
c->flags |= CHN_F_MAPPED;
return atop(vtophys(c->buffer.buf + offset));
}
return -1;
}
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