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d130d86519
freebsd-dev/sys/dev/sound/midi/midi.c
Ariff Abdullah d130d86519 Rearrange locking order to avoid LOR (cat /dev/midistat). 
Reported by:	rodrigc
2007-01-27 15:55:59 +00:00

1517 lines
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/*-
* (c) 2003 Mathew Kanner
*
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson (augustss@netbsd.org).
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Parts of this file started out as NetBSD: midi.c 1.31
* They are mostly gone. Still the most obvious will be the state
* machine midi_in
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/conf.h>
#include <sys/selinfo.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/poll.h>
#include <sys/sbuf.h>
#include <sys/kobj.h>
#include <sys/module.h>
#include <dev/sound/midi/midi.h>
#include "mpu_if.h"
#include <dev/sound/midi/midiq.h>
#include "synth_if.h"
MALLOC_DEFINE(M_MIDI, "midi buffers", "Midi data allocation area");
#define PCMMKMINOR(u, d, c) ((((c) & 0xff) << 16) | (((u) & 0x0f) << 4) | ((d) & 0x0f))
#define MIDIMKMINOR(u, d, c) PCMMKMINOR(u, d, c)
#define MIDI_DEV_RAW 2
#define MIDI_DEV_MIDICTL 12
enum midi_states {
MIDI_IN_START, MIDI_IN_SYSEX, MIDI_IN_DATA
};
/*
* The MPU interface current has init() uninit() inqsize(( outqsize()
* callback() : fiddle with the tx|rx status.
*/
#include "mpu_if.h"
/*
* /dev/rmidi Structure definitions
*/
#define MIDI_NAMELEN 16
struct snd_midi {
KOBJ_FIELDS;
struct mtx lock; /* Protects all but queues */
void *cookie;
int unit; /* Should only be used in midistat */
int channel;/* Should only be used in midistat */
int busy;
int flags; /* File flags */
char name[MIDI_NAMELEN];
struct mtx qlock; /* Protects inq, outq and flags */
MIDIQ_HEAD(, char)inq, outq;
int rchan, wchan;
struct selinfo rsel, wsel;
int hiwat; /* QLEN(outq)>High-water -> disable writes
* from userland */
enum midi_states inq_state;
int inq_status, inq_left; /* Variables for the state
* machine in Midi_in, this
* is to provide that signals
* only get issued only
* complete command packets. */
struct proc *async;
struct cdev *dev;
struct synth_midi *synth;
int synth_flags;
TAILQ_ENTRY(snd_midi) link;
};
struct synth_midi {
KOBJ_FIELDS;
struct snd_midi *m;
};
static synth_open_t midisynth_open;
static synth_close_t midisynth_close;
static synth_writeraw_t midisynth_writeraw;
static synth_killnote_t midisynth_killnote;
static synth_startnote_t midisynth_startnote;
static synth_setinstr_t midisynth_setinstr;
static synth_alloc_t midisynth_alloc;
static synth_controller_t midisynth_controller;
static synth_bender_t midisynth_bender;
static kobj_method_t midisynth_methods[] = {
KOBJMETHOD(synth_open,midisynth_open),
KOBJMETHOD(synth_close,midisynth_close),
KOBJMETHOD(synth_writeraw,midisynth_writeraw),
KOBJMETHOD(synth_setinstr,midisynth_setinstr),
KOBJMETHOD(synth_startnote,midisynth_startnote),
KOBJMETHOD(synth_killnote,midisynth_killnote),
KOBJMETHOD(synth_alloc, midisynth_alloc),
KOBJMETHOD(synth_controller, midisynth_controller),
KOBJMETHOD(synth_bender, midisynth_bender),
{ 0, 0 }
};
DEFINE_CLASS(midisynth, midisynth_methods, 0);
/*
* Module Exports & Interface
*
* struct midi_chan *midi_init(MPU_CLASS cls, int unit, int chan) int
* midi_uninit(struct snd_midi *) 0 == no error EBUSY or other error int
* Midi_in(struct midi_chan *, char *buf, int count) int Midi_out(struct
* midi_chan *, char *buf, int count)
*
* midi_{in,out} return actual size transfered
*
*/
/*
* midi_devs tailq, holder of all rmidi instances protected by midistat_lock
*/
TAILQ_HEAD(, snd_midi) midi_devs;
/*
* /dev/midistat variables and declarations, protected by midistat_lock
*/
static struct mtx midistat_lock;
static int midistat_isopen = 0;
static struct sbuf midistat_sbuf;
static int midistat_bufptr;
static struct cdev *midistat_dev;
/*
* /dev/midistat dev_t declarations
*/
static d_open_t midistat_open;
static d_close_t midistat_close;
static d_read_t midistat_read;
static struct cdevsw midistat_cdevsw = {
.d_version = D_VERSION,
.d_open = midistat_open,
.d_close = midistat_close,
.d_read = midistat_read,
.d_name = "midistat",
};
/*
* /dev/rmidi dev_t declarations, struct variable access is protected by
* locks contained within the structure.
*/
static d_open_t midi_open;
static d_close_t midi_close;
static d_ioctl_t midi_ioctl;
static d_read_t midi_read;
static d_write_t midi_write;
static d_poll_t midi_poll;
static struct cdevsw midi_cdevsw = {
.d_version = D_VERSION,
.d_open = midi_open,
.d_close = midi_close,
.d_read = midi_read,
.d_write = midi_write,
.d_ioctl = midi_ioctl,
.d_poll = midi_poll,
.d_name = "rmidi",
};
/*
* Prototypes of library functions
*/
static int midi_destroy(struct snd_midi *, int);
static int midistat_prepare(struct sbuf * s);
static int midi_load(void);
static int midi_unload(void);
/*
* Misc declr.
*/
SYSCTL_NODE(_hw, OID_AUTO, midi, CTLFLAG_RD, 0, "Midi driver");
SYSCTL_NODE(_hw_midi, OID_AUTO, stat, CTLFLAG_RD, 0, "Status device");
int midi_debug;
/* XXX: should this be moved into debug.midi? */
SYSCTL_INT(_hw_midi, OID_AUTO, debug, CTLFLAG_RW, &midi_debug, 0, "");
int midi_dumpraw;
SYSCTL_INT(_hw_midi, OID_AUTO, dumpraw, CTLFLAG_RW, &midi_dumpraw, 0, "");
int midi_instroff;
SYSCTL_INT(_hw_midi, OID_AUTO, instroff, CTLFLAG_RW, &midi_instroff, 0, "");
int midistat_verbose;
SYSCTL_INT(_hw_midi_stat, OID_AUTO, verbose, CTLFLAG_RW,
&midistat_verbose, 0, "");
#define MIDI_DEBUG(l,a) if(midi_debug>=l) a
/*
* CODE START
*/
/*
* Register a new rmidi device. cls midi_if interface unit == 0 means
* auto-assign new unit number unit != 0 already assigned a unit number, eg.
* not the first channel provided by this device. channel, sub-unit
* cookie is passed back on MPU calls Typical device drivers will call with
* unit=0, channel=1..(number of channels) and cookie=soft_c and won't care
* what unit number is used.
*
* It is an error to call midi_init with an already used unit/channel combo.
*
* Returns NULL on error
*
*/
struct snd_midi *
midi_init(kobj_class_t cls, int unit, int channel, void *cookie)
{
struct snd_midi *m;
int i;
int inqsize, outqsize;
MIDI_TYPE *buf;
MIDI_DEBUG(1,printf("midiinit: unit %d/%d.\n", unit, channel));
mtx_lock(&midistat_lock);
/*
* Protect against call with existing unit/channel or auto-allocate a
* new unit number.
*/
i = -1;
TAILQ_FOREACH(m, &midi_devs, link) {
mtx_lock(&m->lock);
if (unit != 0) {
if (m->unit == unit && m->channel == channel) {
mtx_unlock(&m->lock);
goto err0;
}
} else {
/*
* Find a better unit number
*/
if (m->unit > i)
i = m->unit;
}
mtx_unlock(&m->lock);
}
if (unit == 0)
unit = i + 1;
MIDI_DEBUG(1, printf("midiinit #2: unit %d/%d.\n", unit, channel));
m = malloc(sizeof(*m), M_MIDI, M_NOWAIT | M_ZERO);
if (m == NULL)
goto err0;
m->synth = malloc(sizeof(*m->synth), M_MIDI, M_NOWAIT | M_ZERO);
kobj_init((kobj_t)m->synth, &midisynth_class);
m->synth->m = m;
kobj_init((kobj_t)m, cls);
inqsize = MPU_INQSIZE(m, cookie);
outqsize = MPU_OUTQSIZE(m, cookie);
MIDI_DEBUG(1, printf("midiinit queues %d/%d.\n", inqsize, outqsize));
if (!inqsize && !outqsize)
goto err1;
mtx_init(&m->lock, "raw midi", 0, 0);
mtx_init(&m->qlock, "q raw midi", 0, 0);
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
if (inqsize)
buf = malloc(sizeof(MIDI_TYPE) * inqsize, M_MIDI, M_NOWAIT);
else
buf = NULL;
MIDIQ_INIT(m->inq, buf, inqsize);
if (outqsize)
buf = malloc(sizeof(MIDI_TYPE) * outqsize, M_MIDI, M_NOWAIT);
else
buf = NULL;
m->hiwat = outqsize / 2;
MIDIQ_INIT(m->outq, buf, outqsize);
if ((inqsize && !MIDIQ_BUF(m->inq)) ||
(outqsize && !MIDIQ_BUF(m->outq)))
goto err2;
m->busy = 0;
m->flags = 0;
m->unit = unit;
m->channel = channel;
m->cookie = cookie;
if (MPU_INIT(m, cookie))
goto err2;
mtx_unlock(&m->lock);
mtx_unlock(&m->qlock);
TAILQ_INSERT_TAIL(&midi_devs, m, link);
mtx_unlock(&midistat_lock);
m->dev = make_dev(&midi_cdevsw,
MIDIMKMINOR(unit, MIDI_DEV_RAW, channel),
UID_ROOT, GID_WHEEL, 0666, "midi%d.%d", unit, channel);
m->dev->si_drv1 = m;
return m;
err2: mtx_destroy(&m->qlock);
mtx_destroy(&m->lock);
if (MIDIQ_BUF(m->inq))
free(MIDIQ_BUF(m->inq), M_MIDI);
if (MIDIQ_BUF(m->outq))
free(MIDIQ_BUF(m->outq), M_MIDI);
err1: free(m, M_MIDI);
err0: mtx_unlock(&midistat_lock);
MIDI_DEBUG(1, printf("midi_init ended in error\n"));
return NULL;
}
/*
* midi_uninit does not call MIDI_UNINIT, as since this is the implementors
* entry point. midi_unint if fact, does not send any methods. A call to
* midi_uninit is a defacto promise that you won't manipulate ch anymore
*
*/
int
midi_uninit(struct snd_midi * m)
{
int err;
err = ENXIO;
mtx_lock(&midistat_lock);
mtx_lock(&m->lock);
if (m->busy) {
if (!(m->rchan || m->wchan))
goto err;
if (m->rchan) {
wakeup(&m->rchan);
m->rchan = 0;
}
if (m->wchan) {
wakeup(&m->wchan);
m->wchan = 0;
}
}
err = midi_destroy(m, 0);
if(!err)
goto exit;
err: mtx_unlock(&m->lock);
exit: mtx_unlock(&midistat_lock);
return err;
}
/*
* midi_in: process all data until the queue is full, then discards the rest.
* Since midi_in is a state machine, data discards can cause it to get out of
* whack. Process as much as possible. It calls, wakeup, selnotify and
* psignal at most once.
*/
#ifdef notdef
static int midi_lengths[] = {2, 2, 2, 2, 1, 1, 2, 0};
#endif /* notdef */
/* Number of bytes in a MIDI command */
#define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7])
#define MIDI_ACK 0xfe
#define MIDI_IS_STATUS(d) ((d) >= 0x80)
#define MIDI_IS_COMMON(d) ((d) >= 0xf0)
#define MIDI_SYSEX_START 0xF0
#define MIDI_SYSEX_END 0xF7
int
midi_in(struct snd_midi * m, MIDI_TYPE * buf, int size)
{
/* int i, sig, enq; */
int used;
/* MIDI_TYPE data; */
MIDI_DEBUG(5, printf("midi_in: m=%p size=%d\n", m, size));
/*
* XXX: locking flub
*/
if (!(m->flags & M_RX))
return size;
used = 0;
mtx_lock(&m->qlock);
#if 0
/*
* Don't bother queuing if not in read mode. Discard everything and
* return size so the caller doesn't freak out.
*/
if (!(m->flags & M_RX))
return size;
for (i = sig = 0; i < size; i++) {
data = buf[i];
enq = 0;
if (data == MIDI_ACK)
continue;
switch (m->inq_state) {
case MIDI_IN_START:
if (MIDI_IS_STATUS(data)) {
switch (data) {
case 0xf0: /* Sysex */
m->inq_state = MIDI_IN_SYSEX;
break;
case 0xf1: /* MTC quarter frame */
case 0xf3: /* Song select */
m->inq_state = MIDI_IN_DATA;
enq = 1;
m->inq_left = 1;
break;
case 0xf2: /* Song position pointer */
m->inq_state = MIDI_IN_DATA;
enq = 1;
m->inq_left = 2;
break;
default:
if (MIDI_IS_COMMON(data)) {
enq = 1;
sig = 1;
} else {
m->inq_state = MIDI_IN_DATA;
enq = 1;
m->inq_status = data;
m->inq_left = MIDI_LENGTH(data);
}
break;
}
} else if (MIDI_IS_STATUS(m->inq_status)) {
m->inq_state = MIDI_IN_DATA;
if (!MIDIQ_FULL(m->inq)) {
used++;
MIDIQ_ENQ(m->inq, &m->inq_status, 1);
}
enq = 1;
m->inq_left = MIDI_LENGTH(m->inq_status) - 1;
}
break;
/*
* End of case MIDI_IN_START:
*/
case MIDI_IN_DATA:
enq = 1;
if (--m->inq_left <= 0)
sig = 1; /* deliver data */
break;
case MIDI_IN_SYSEX:
if (data == MIDI_SYSEX_END)
m->inq_state = MIDI_IN_START;
break;
}
if (enq)
if (!MIDIQ_FULL(m->inq)) {
MIDIQ_ENQ(m->inq, &data, 1);
used++;
}
/*
* End of the state machines main "for loop"
*/
}
if (sig) {
#endif
MIDI_DEBUG(6, printf("midi_in: len %jd avail %jd\n", (intmax_t)MIDIQ_LEN(m->inq), (intmax_t)MIDIQ_AVAIL(m->inq))) ;
if (MIDIQ_AVAIL(m->inq) > size) {
used=size;
MIDIQ_ENQ(m->inq, buf, size);
} else {
MIDI_DEBUG(4,printf("midi_in: Discarding data qu\n"));
mtx_unlock(&m->qlock);
return 0;
}
if (m->rchan) {
wakeup(&m->rchan);
m->rchan = 0;
}
selwakeup(&m->rsel);
if (m->async) {
PROC_LOCK(m->async);
psignal(m->async, SIGIO);
PROC_UNLOCK(m->async);
}
#if 0
}
#endif
mtx_unlock(&m->qlock);
return used;
}
/*
* midi_out: The only clearer of the M_TXEN flag.
*/
int
midi_out(struct snd_midi * m, MIDI_TYPE * buf, int size)
{
int used;
/*
* XXX: locking flub
*/
if (!(m->flags & M_TXEN))
return 0;
MIDI_DEBUG(2, printf("midi_out: %p\n", m));
mtx_lock(&m->qlock);
used = MIN(size, MIDIQ_LEN(m->outq));
MIDI_DEBUG(3, printf("midi_out: used %d\n", used));
if (used)
MIDIQ_DEQ(m->outq, buf, used);
if (MIDIQ_EMPTY(m->outq)) {
m->flags &= ~M_TXEN;
MPU_CALLBACKP(m, m->cookie, m->flags);
}
if (used && MIDIQ_AVAIL(m->outq) > m->hiwat ) {
if (m->wchan) {
wakeup(&m->wchan);
m->wchan = 0;
}
selwakeup(&m->wsel);
if (m->async) {
PROC_LOCK(m->async);
psignal(m->async, SIGIO);
PROC_UNLOCK(m->async);
}
}
mtx_unlock(&m->qlock);
return used;
}
/*
* /dev/rmidi#.# device access functions
*/
int
midi_open(struct cdev *i_dev, int flags, int mode, struct thread * td)
{
struct snd_midi *m = i_dev->si_drv1;
int retval;
MIDI_DEBUG(1,printf("midiopen %p %s %s\n", td,
flags & FREAD?"M_RX":"", flags & FWRITE?"M_TX":""));
if (m == NULL)
return ENXIO;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
retval = 0;
if (flags & FREAD) {
if (MIDIQ_SIZE(m->inq) == 0)
retval = ENXIO;
else if (m->flags & M_RX)
retval = EBUSY;
if (retval)
goto err;
}
if (flags & FWRITE) {
if (MIDIQ_SIZE(m->outq) == 0)
retval = ENXIO;
else if (m->flags & M_TX)
retval = EBUSY;
if (retval)
goto err;
}
m->busy++;
m->rchan = 0;
m->wchan = 0;
m->async = 0;
if (flags & FREAD) {
m->flags |= M_RX | M_RXEN;
/*
* Only clear the inq, the outq might still have data to drain from
* a previous session
*/
MIDIQ_CLEAR(m->inq);
};
if (flags & FWRITE)
m->flags |= M_TX;
MPU_CALLBACK(m, m->cookie, m->flags);
MIDI_DEBUG(2, printf("midi_open: opened.\n"));
err: mtx_unlock(&m->qlock);
mtx_unlock(&m->lock);
return retval;
}
int
midi_close(struct cdev *i_dev, int flags, int mode, struct thread * td)
{
struct snd_midi *m = i_dev->si_drv1;
int retval;
int oldflags;
MIDI_DEBUG(1, printf("midi_close %p %s %s\n", td,
flags & FREAD?"M_RX":"", flags & FWRITE?"M_TX":""));
if (m == NULL)
return ENXIO;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
if ( (flags & FREAD && !(m->flags & M_RX)) ||
(flags & FWRITE && !(m->flags & M_TX)) ) {
retval = ENXIO;
goto err;
}
m->busy--;
oldflags = m->flags;
if (flags & FREAD)
m->flags &= ~(M_RX | M_RXEN);
if (flags & FWRITE)
m->flags &= ~M_TX;
if( (m->flags & (M_TXEN | M_RXEN)) != (oldflags & (M_RXEN | M_TXEN)) )
MPU_CALLBACK(m, m->cookie, m->flags);
MIDI_DEBUG(1, printf("midi_close: closed, busy = %d.\n", m->busy));
mtx_unlock(&m->qlock);
mtx_unlock(&m->lock);
retval = 0;
err: return retval;
}
/*
* TODO: midi_read, per oss programmer's guide pg. 42 should return as soon as data is available.
*/
int
midi_read(struct cdev *i_dev, struct uio * uio, int ioflag)
{
#define MIDI_RSIZE 32
struct snd_midi *m = i_dev->si_drv1;
int retval;
int used;
char buf[MIDI_RSIZE];
MIDI_DEBUG(5, printf("midiread: count=%lu\n", (unsigned long)uio->uio_resid));
retval = EIO;
if (m == NULL)
goto err0;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
if (!(m->flags & M_RX))
goto err1;
while (uio->uio_resid > 0) {
while (MIDIQ_EMPTY(m->inq)) {
retval = EWOULDBLOCK;
if (ioflag & O_NONBLOCK)
goto err1;
mtx_unlock(&m->lock);
m->rchan = 1;
retval = msleep(&m->rchan, &m->qlock,
PCATCH | PDROP, "midi RX", 0);
/*
* We slept, maybe things have changed since last
* dying check
*/
if (retval == EINTR)
goto err0;
if (m != i_dev->si_drv1)
retval = ENXIO;
/* if (retval && retval != ERESTART) */
if (retval)
goto err0;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
m->rchan = 0;
if (!m->busy)
goto err1;
}
MIDI_DEBUG(6, printf("midi_read start\n"));
/*
* At this point, it is certain that m->inq has data
*/
used = MIN(MIDIQ_LEN(m->inq), uio->uio_resid);
used = MIN(used, MIDI_RSIZE);
MIDI_DEBUG(6,printf("midiread: uiomove cc=%d\n", used));
MIDIQ_DEQ(m->inq, buf, used);
retval = uiomove(buf, used, uio);
if (retval)
goto err1;
}
/*
* If we Made it here then transfer is good
*/
retval = 0;
err1: mtx_unlock(&m->qlock);
mtx_unlock(&m->lock);
err0: MIDI_DEBUG(4, printf("midi_read: ret %d\n",retval));
return retval;
}
/*
* midi_write: The only setter of M_TXEN
*/
int
midi_write(struct cdev *i_dev, struct uio * uio, int ioflag)
{
#define MIDI_WSIZE 32
struct snd_midi *m = i_dev->si_drv1;
int retval;
int used;
char buf[MIDI_WSIZE];
MIDI_DEBUG(4, printf("midi_write\n"));
retval = 0;
if (m == NULL)
goto err0;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
if (!(m->flags & M_TX))
goto err1;
while (uio->uio_resid > 0) {
while (MIDIQ_AVAIL(m->outq) == 0) {
retval = EWOULDBLOCK;
if (ioflag & O_NONBLOCK)
goto err1;
mtx_unlock(&m->lock);
m->wchan = 1;
MIDI_DEBUG(3,printf("midi_write msleep\n"));
retval = msleep(&m->wchan, &m->qlock,
PCATCH | PDROP, "midi TX", 0);
/*
* We slept, maybe things have changed since last
* dying check
*/
if (retval == EINTR)
goto err0;
if (m != i_dev->si_drv1)
retval = ENXIO;
if (retval)
goto err0;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
m->wchan = 0;
if (!m->busy)
goto err1;
}
/*
* We are certain than data can be placed on the queue
*/
used = MIN(MIDIQ_AVAIL(m->outq), uio->uio_resid);
used = MIN(used, MIDI_WSIZE);
MIDI_DEBUG(5,printf("midiout: resid %d len %jd avail %jd\n", uio->uio_resid, (intmax_t)MIDIQ_LEN(m->outq), (intmax_t)MIDIQ_AVAIL(m->outq)));
MIDI_DEBUG(5,printf("midi_write: uiomove cc=%d\n", used));
retval = uiomove(buf, used, uio);
if (retval)
goto err1;
MIDIQ_ENQ(m->outq, buf, used);
/*
* Inform the bottom half that data can be written
*/
if (!(m->flags & M_TXEN)) {
m->flags |= M_TXEN;
MPU_CALLBACK(m, m->cookie, m->flags);
}
}
/*
* If we Made it here then transfer is good
*/
retval = 0;
err1: mtx_unlock(&m->qlock);
mtx_unlock(&m->lock);
err0: return retval;
}
int
midi_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode, struct thread * td)
{
return ENXIO;
}
int
midi_poll(struct cdev *i_dev, int events, struct thread * td)
{
struct snd_midi *m = i_dev->si_drv1;
int revents;
if (m == NULL)
return 0;
revents = 0;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
if (events & (POLLIN | POLLRDNORM))
if (!MIDIQ_EMPTY(m->inq))
events |= events & (POLLIN | POLLRDNORM);
if (events & (POLLOUT | POLLWRNORM))
if (MIDIQ_AVAIL(m->outq) < m->hiwat)
events |= events & (POLLOUT | POLLWRNORM);
if (revents == 0) {
if (events & (POLLIN | POLLRDNORM))
selrecord(td, &m->rsel);
if (events & (POLLOUT | POLLWRNORM))
selrecord(td, &m->wsel);
}
mtx_unlock(&m->lock);
mtx_unlock(&m->qlock);
return (revents);
}
/*
* /dev/midistat device functions
*
*/
static int
midistat_open(struct cdev *i_dev, int flags, int mode, struct thread * td)
{
int error;
MIDI_DEBUG(1,printf("midistat_open\n"));
mtx_lock(&midistat_lock);
if (midistat_isopen) {
mtx_unlock(&midistat_lock);
return EBUSY;
}
midistat_isopen = 1;
mtx_unlock(&midistat_lock);
if (sbuf_new(&midistat_sbuf, NULL, 4096, SBUF_AUTOEXTEND) == NULL) {
error = ENXIO;
mtx_lock(&midistat_lock);
goto out;
}
mtx_lock(&midistat_lock);
midistat_bufptr = 0;
error = (midistat_prepare(&midistat_sbuf) > 0) ? 0 : ENOMEM;
out: if (error)
midistat_isopen = 0;
mtx_unlock(&midistat_lock);
return error;
}
static int
midistat_close(struct cdev *i_dev, int flags, int mode, struct thread * td)
{
MIDI_DEBUG(1,printf("midistat_close\n"));
mtx_lock(&midistat_lock);
if (!midistat_isopen) {
mtx_unlock(&midistat_lock);
return EBADF;
}
sbuf_delete(&midistat_sbuf);
midistat_isopen = 0;
mtx_unlock(&midistat_lock);
return 0;
}
static int
midistat_read(struct cdev *i_dev, struct uio * buf, int flag)
{
int l, err;
MIDI_DEBUG(4,printf("midistat_read\n"));
mtx_lock(&midistat_lock);
if (!midistat_isopen) {
mtx_unlock(&midistat_lock);
return EBADF;
}
l = min(buf->uio_resid, sbuf_len(&midistat_sbuf) - midistat_bufptr);
err = 0;
if (l > 0) {
mtx_unlock(&midistat_lock);
err = uiomove(sbuf_data(&midistat_sbuf) + midistat_bufptr, l, buf);
mtx_lock(&midistat_lock);
} else
l = 0;
midistat_bufptr += l;
mtx_unlock(&midistat_lock);
return err;
}
/*
* Module library functions
*/
static int
midistat_prepare(struct sbuf * s)
{
struct snd_midi *m;
mtx_assert(&midistat_lock, MA_OWNED);
sbuf_printf(s, "FreeBSD Midi Driver (midi2)\n");
if (TAILQ_EMPTY(&midi_devs)) {
sbuf_printf(s, "No devices installed.\n");
sbuf_finish(s);
return sbuf_len(s);
}
sbuf_printf(s, "Installed devices:\n");
TAILQ_FOREACH(m, &midi_devs, link) {
mtx_lock(&m->lock);
sbuf_printf(s, "%s [%d/%d:%s]", m->name, m->unit, m->channel,
MPU_PROVIDER(m, m->cookie));
sbuf_printf(s, "%s", MPU_DESCR(m, m->cookie, midistat_verbose));
sbuf_printf(s, "\n");
mtx_unlock(&m->lock);
}
sbuf_finish(s);
return sbuf_len(s);
}
#ifdef notdef
/*
* Convert IOCTL command to string for debugging
*/
static char *
midi_cmdname(int cmd)
{
static struct {
int cmd;
char *name;
} *tab, cmdtab_midiioctl[] = {
#define A(x) {x, ## x}
/*
* Once we have some real IOCTLs define, the following will
* be relavant.
*
* A(SNDCTL_MIDI_PRETIME), A(SNDCTL_MIDI_MPUMODE),
* A(SNDCTL_MIDI_MPUCMD), A(SNDCTL_SYNTH_INFO),
* A(SNDCTL_MIDI_INFO), A(SNDCTL_SYNTH_MEMAVL),
* A(SNDCTL_FM_LOAD_INSTR), A(SNDCTL_FM_4OP_ENABLE),
* A(MIOSPASSTHRU), A(MIOGPASSTHRU), A(AIONWRITE),
* A(AIOGSIZE), A(AIOSSIZE), A(AIOGFMT), A(AIOSFMT),
* A(AIOGMIX), A(AIOSMIX), A(AIOSTOP), A(AIOSYNC),
* A(AIOGCAP),
*/
#undef A
{
-1, "unknown"
},
};
for (tab = cmdtab_midiioctl; tab->cmd != cmd && tab->cmd != -1; tab++)
;
return tab->name;
}
#endif /* notdef */
/*
* midisynth
*/
int
midisynth_open(void *n, void *arg, int flags)
{
struct snd_midi *m = ((struct synth_midi * ) n)->m;
int retval;
MIDI_DEBUG(1,printf("midisynth_open %s %s\n",
flags & FREAD?"M_RX":"", flags & FWRITE?"M_TX":""));
if (m == NULL)
return ENXIO;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
retval = 0;
if (flags & FREAD) {
if (MIDIQ_SIZE(m->inq) == 0)
retval = ENXIO;
else if (m->flags & M_RX)
retval = EBUSY;
if (retval)
goto err;
}
if (flags & FWRITE) {
if (MIDIQ_SIZE(m->outq) == 0)
retval = ENXIO;
else if (m->flags & M_TX)
retval = EBUSY;
if (retval)
goto err;
}
m->busy++;
/*
* TODO: Consider m->async = 0;
*/
if (flags & FREAD) {
m->flags |= M_RX | M_RXEN;
/*
* Only clear the inq, the outq might still have data to drain from
* a previous session
*/
MIDIQ_CLEAR(m->inq);
m->rchan = 0;
};
if (flags & FWRITE) {
m->flags |= M_TX;
m->wchan = 0;
}
m->synth_flags = flags & (FREAD | FWRITE);
MPU_CALLBACK(m, m->cookie, m->flags);
err: mtx_unlock(&m->qlock);
mtx_unlock(&m->lock);
MIDI_DEBUG(2, printf("midisynth_open: return %d.\n", retval));
return retval;
}
int
midisynth_close(void *n)
{
struct snd_midi *m = ((struct synth_midi *)n)->m;
int retval;
int oldflags;
MIDI_DEBUG(1, printf("midisynth_close %s %s\n",
m->synth_flags & FREAD ? "M_RX" : "",
m->synth_flags & FWRITE ? "M_TX" : ""));
if (m == NULL)
return ENXIO;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
if ( (m->synth_flags & FREAD && !(m->flags & M_RX)) ||
(m->synth_flags & FWRITE && !(m->flags & M_TX)) ) {
retval = ENXIO;
goto err;
}
m->busy--;
oldflags = m->flags;
if (m->synth_flags & FREAD)
m->flags &= ~(M_RX | M_RXEN);
if (m->synth_flags & FWRITE)
m->flags &= ~M_TX;
if( (m->flags & (M_TXEN | M_RXEN)) != (oldflags & (M_RXEN | M_TXEN)) )
MPU_CALLBACK(m, m->cookie, m->flags);
MIDI_DEBUG(1, printf("midi_close: closed, busy = %d.\n", m->busy));
mtx_unlock(&m->qlock);
mtx_unlock(&m->lock);
retval = 0;
err: return retval;
}
/*
* Always blocking.
*/
int
midisynth_writeraw(void *n, uint8_t *buf, size_t len)
{
struct snd_midi *m = ((struct synth_midi *)n)->m;
int retval;
int used;
int i;
MIDI_DEBUG(4, printf("midisynth_writeraw\n"));
retval = 0;
if (m == NULL)
return ENXIO;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
if (!(m->flags & M_TX))
goto err1;
if (midi_dumpraw)
printf("midi dump: ");
while (len > 0) {
while (MIDIQ_AVAIL(m->outq) == 0) {
if (!(m->flags & M_TXEN)) {
m->flags |= M_TXEN;
MPU_CALLBACK(m, m->cookie, m->flags);
}
mtx_unlock(&m->lock);
m->wchan = 1;
MIDI_DEBUG(3,printf("midisynth_writeraw msleep\n"));
retval = msleep(&m->wchan, &m->qlock,
PCATCH | PDROP, "midi TX", 0);
/*
* We slept, maybe things have changed since last
* dying check
*/
if (retval == EINTR)
goto err0;
if (retval)
goto err0;
mtx_lock(&m->lock);
mtx_lock(&m->qlock);
m->wchan = 0;
if (!m->busy)
goto err1;
}
/*
* We are certain than data can be placed on the queue
*/
used = MIN(MIDIQ_AVAIL(m->outq), len);
used = MIN(used, MIDI_WSIZE);
MIDI_DEBUG(5,printf("midi_synth: resid %zu len %jd avail %jd\n",
len, (intmax_t)MIDIQ_LEN(m->outq),
(intmax_t)MIDIQ_AVAIL(m->outq)));
if (midi_dumpraw)
for(i=0;i<used;i++) printf("%x ", buf[i]);
MIDIQ_ENQ(m->outq, buf, used);
len -= used;
/*
* Inform the bottom half that data can be written
*/
if (!(m->flags & M_TXEN)) {
m->flags |= M_TXEN;
MPU_CALLBACK(m, m->cookie, m->flags);
}
}
/*
* If we Made it here then transfer is good
*/
if (midi_dumpraw)
printf("\n");
retval = 0;
err1: mtx_unlock(&m->qlock);
mtx_unlock(&m->lock);
err0: return retval;
}
static int
midisynth_killnote(void *n, uint8_t chn, uint8_t note, uint8_t vel)
{
u_char c[3];
if (note > 127 || chn > 15)
return (EINVAL);
if (vel > 127)
vel = 127;
if (vel == 64) {
c[0] = 0x90 | (chn & 0x0f); /* Note on. */
c[1] = (u_char)note;
c[2] = 0;
} else {
c[0] = 0x80 | (chn & 0x0f); /* Note off. */
c[1] = (u_char)note;
c[2] = (u_char)vel;
}
return midisynth_writeraw(n, c, 3);
}
static int
midisynth_setinstr(void *n, uint8_t chn, uint16_t instr)
{
u_char c[2];
if (instr > 127 || chn > 15)
return EINVAL;
c[0] = 0xc0 | (chn & 0x0f); /* Progamme change. */
c[1] = instr + midi_instroff;
return midisynth_writeraw(n, c, 2);
}
static int
midisynth_startnote(void *n, uint8_t chn, uint8_t note, uint8_t vel)
{
u_char c[3];
if (note > 127 || chn > 15)
return EINVAL;
if (vel > 127)
vel = 127;
c[0] = 0x90 | (chn & 0x0f); /* Note on. */
c[1] = (u_char)note;
c[2] = (u_char)vel;
return midisynth_writeraw(n, c, 3);
}
static int
midisynth_alloc(void *n, uint8_t chan, uint8_t note)
{
return chan;
}
static int
midisynth_controller(void *n, uint8_t chn, uint8_t ctrlnum, uint16_t val)
{
u_char c[3];
if (ctrlnum > 127 || chn > 15)
return EINVAL;
c[0] = 0xb0 | (chn & 0x0f); /* Control Message. */
c[1] = ctrlnum;
c[2] = val;
return midisynth_writeraw(n, c, 3);
}
static int
midisynth_bender(void *n, uint8_t chn, uint16_t val)
{
u_char c[3];
if (val > 16383 || chn > 15)
return EINVAL;
c[0] = 0xe0 | (chn & 0x0f); /* Pitch bend. */
c[1] = (u_char)val & 0x7f;
c[2] = (u_char)(val >> 7) & 0x7f;
return midisynth_writeraw(n, c, 3);
}
/*
* Single point of midi destructions.
*/
static int
midi_destroy(struct snd_midi * m, int midiuninit)
{
mtx_assert(&midistat_lock, MA_OWNED);
mtx_assert(&m->lock, MA_OWNED);
MIDI_DEBUG(3,printf("midi_destroy\n"));
m->dev->si_drv1 = NULL;
destroy_dev(m->dev);
TAILQ_REMOVE(&midi_devs, m, link);
if (midiuninit)
MPU_UNINIT(m, m->cookie);
free(MIDIQ_BUF(m->inq), M_MIDI);
free(MIDIQ_BUF(m->outq), M_MIDI);
mtx_destroy(&m->qlock);
mtx_destroy(&m->lock);
free(m, M_MIDI);
return 0;
}
/*
* Load and unload functions, creates the /dev/midistat device
*/
static int
midi_load()
{
mtx_init(&midistat_lock, "midistat lock", 0, 0);
TAILQ_INIT(&midi_devs); /* Initialize the queue. */
midistat_dev = make_dev(&midistat_cdevsw,
MIDIMKMINOR(0, MIDI_DEV_MIDICTL, 0),
UID_ROOT, GID_WHEEL, 0666, "midistat");
return 0;
}
static int
midi_unload()
{
struct snd_midi *m;
int retval;
MIDI_DEBUG(1,printf("midi_unload()\n"));
retval = EBUSY;
mtx_lock(&midistat_lock);
if (midistat_isopen)
goto exit0;
TAILQ_FOREACH(m, &midi_devs, link) {
mtx_lock(&m->lock);
if (m->busy)
retval = EBUSY;
else
retval = midi_destroy(m, 1);
if (retval)
goto exit1;
}
destroy_dev(midistat_dev);
/*
* Made it here then unload is complete
*/
mtx_destroy(&midistat_lock);
return 0;
exit1:
mtx_unlock(&m->lock);
exit0:
mtx_unlock(&midistat_lock);
if(retval) MIDI_DEBUG(2,printf("midi_unload: failed\n"));
return retval;
}
extern int seq_modevent(module_t mod, int type, void *data);
static int
midi_modevent(module_t mod, int type, void *data)
{
int retval;
retval = 0;
switch (type) {
case MOD_LOAD:
retval = midi_load();
if (retval == 0)
retval = seq_modevent(mod, type, data);
break;
case MOD_UNLOAD:
retval = midi_unload();
if (retval == 0)
retval = seq_modevent(mod, type, data);
break;
default:
break;
}
return retval;
}
kobj_t
midimapper_addseq(void *arg1, int *unit, void **cookie)
{
unit = 0;
return (kobj_t) arg1;
}
int
midimapper_open(void *arg1, void **cookie)
{
int retval = 0;
struct snd_midi *m;
mtx_lock(&midistat_lock);
TAILQ_FOREACH(m, &midi_devs, link) {
retval++;
}
mtx_unlock(&midistat_lock);
return retval;
}
int
midimapper_close(void *arg1, void *cookie)
{
return 0;
}
kobj_t
midimapper_fetch_synth(void *arg, void *cookie, int unit)
{
struct snd_midi *m;
int retval = 0;
mtx_lock(&midistat_lock);
TAILQ_FOREACH(m, &midi_devs, link) {
if (unit == retval) {
mtx_unlock(&midistat_lock);
return (kobj_t)m->synth;
}
retval++;
}
mtx_unlock(&midistat_lock);
return NULL;
}
DEV_MODULE(midi, midi_modevent, NULL);
MODULE_VERSION(midi, 1);
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