/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (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. * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_KERNEL_OPTION_HEADERS #include "opt_snd.h" #endif #include #include "mpu_if.h" #include #include "synth_if.h" MALLOC_DEFINE(M_MIDI, "midi buffers", "Midi data allocation area"); #ifndef KOBJMETHOD_END #define KOBJMETHOD_END { NULL, NULL } #endif #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), KOBJMETHOD_END }; DEFINE_CLASS(midisynth, midisynth_methods, 0); /* * Module Exports & Interface * * struct midi_chan *midi_init(MPU_CLASS cls, int unit, int chan, * void *cookie) * int midi_uninit(struct snd_midi *) * * 0 == no error * EBUSY or other error * * int midi_in(struct snd_midi *, char *buf, int count) * int midi_out(struct snd_midi *, 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 sx midistat_lock; static int midistat_isopen = 0; static struct sbuf midistat_sbuf; 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 | CTLFLAG_MPSAFE, 0, "Midi driver"); static SYSCTL_NODE(_hw_midi, OID_AUTO, stat, CTLFLAG_RD | CTLFLAG_MPSAFE, 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)); sx_xlock(&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_WAITOK | M_ZERO); m->synth = malloc(sizeof(*m->synth), M_MIDI, M_WAITOK | 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", NULL, 0); mtx_init(&m->qlock, "q raw midi", NULL, 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); sx_xunlock(&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->synth, M_MIDI); free(m, M_MIDI); err0: sx_xunlock(&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_uninit 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 = EBUSY; sx_xlock(&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: sx_xunlock(&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); kern_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); kern_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 %zd 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")); sx_xlock(&midistat_lock); if (midistat_isopen) { sx_xunlock(&midistat_lock); return EBUSY; } midistat_isopen = 1; if (sbuf_new(&midistat_sbuf, NULL, 4096, SBUF_AUTOEXTEND) == NULL) { error = ENXIO; goto out; } error = (midistat_prepare(&midistat_sbuf) > 0) ? 0 : ENOMEM; out: if (error) midistat_isopen = 0; sx_xunlock(&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")); sx_xlock(&midistat_lock); if (!midistat_isopen) { sx_xunlock(&midistat_lock); return EBADF; } sbuf_delete(&midistat_sbuf); midistat_isopen = 0; sx_xunlock(&midistat_lock); return 0; } static int midistat_read(struct cdev *i_dev, struct uio *uio, int flag) { long l; int err; MIDI_DEBUG(4, printf("midistat_read\n")); sx_xlock(&midistat_lock); if (!midistat_isopen) { sx_xunlock(&midistat_lock); return EBADF; } if (uio->uio_offset < 0 || uio->uio_offset > sbuf_len(&midistat_sbuf)) { sx_xunlock(&midistat_lock); return EINVAL; } err = 0; l = lmin(uio->uio_resid, sbuf_len(&midistat_sbuf) - uio->uio_offset); if (l > 0) { err = uiomove(sbuf_data(&midistat_sbuf) + uio->uio_offset, l, uio); } sx_xunlock(&midistat_lock); return err; } /* * Module library functions */ static int midistat_prepare(struct sbuf *s) { struct snd_midi *m; sx_assert(&midistat_lock, SA_XLOCKED); 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) { sx_assert(&midistat_lock, SA_XLOCKED); mtx_assert(&m->lock, MA_OWNED); MIDI_DEBUG(3, printf("midi_destroy\n")); m->dev->si_drv1 = NULL; mtx_unlock(&m->lock); /* XXX */ 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->synth, M_MIDI); free(m, M_MIDI); return 0; } /* * Load and unload functions, creates the /dev/midistat device */ static int midi_load(void) { sx_init(&midistat_lock, "midistat lock"); TAILQ_INIT(&midi_devs); midistat_dev = make_dev(&midistat_cdevsw, MIDIMKMINOR(0, MIDI_DEV_MIDICTL, 0), UID_ROOT, GID_WHEEL, 0666, "midistat"); return 0; } static int midi_unload(void) { struct snd_midi *m, *tmp; int retval; MIDI_DEBUG(1, printf("midi_unload()\n")); retval = EBUSY; sx_xlock(&midistat_lock); if (midistat_isopen) goto exit0; TAILQ_FOREACH_SAFE(m, &midi_devs, link, tmp) { mtx_lock(&m->lock); if (m->busy) retval = EBUSY; else retval = midi_destroy(m, 1); if (retval) goto exit1; } sx_xunlock(&midistat_lock); destroy_dev(midistat_dev); /* * Made it here then unload is complete */ sx_destroy(&midistat_lock); return 0; exit1: mtx_unlock(&m->lock); exit0: sx_xunlock(&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 = NULL; return (kobj_t)arg1; } int midimapper_open(void *arg1, void **cookie) { int retval = 0; struct snd_midi *m; sx_xlock(&midistat_lock); TAILQ_FOREACH(m, &midi_devs, link) { retval++; } sx_xunlock(&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; sx_xlock(&midistat_lock); TAILQ_FOREACH(m, &midi_devs, link) { if (unit == retval) { sx_xunlock(&midistat_lock); return (kobj_t)m->synth; } retval++; } sx_xunlock(&midistat_lock); return NULL; } DEV_MODULE(midi, midi_modevent, NULL); MODULE_VERSION(midi, 1);