/* $NetBSD: midi.c,v 1.59 2007/12/16 19:01:35 christos Exp $ */ /* * 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) and (MIDI FST and Active * Sense handling) Chapman Flack (chap@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. */ #include __KERNEL_RCSID(0, "$NetBSD: midi.c,v 1.59 2007/12/16 19:01:35 christos Exp $"); #include "midi.h" #include "sequencer.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if NMIDI > 0 #ifdef AUDIO_DEBUG #define DPRINTF(x) if (mididebug) printf x #define DPRINTFN(n,x) if (mididebug >= (n)) printf x int mididebug = 0; /* * 1: detected protocol errors and buffer overflows * 2: probe, attach, detach * 3: open, close * 4: data received except realtime * 5: ioctl * 6: read, write, poll * 7: data transmitted * 8: uiomoves, synchronization * 9: realtime data received */ #else #define DPRINTF(x) #define DPRINTFN(n,x) #endif static struct simplelock hwif_register_lock = SIMPLELOCK_INITIALIZER; static struct midi_softc *hwif_softc = NULL; void midi_in(void *, int); void midi_out(void *); int midi_poll_out(struct midi_softc *); int midi_intr_out(struct midi_softc *); int midi_msg_out(struct midi_softc *, u_char **, u_char **, u_char **, u_char **); int midi_start_output(struct midi_softc *); int midi_sleep_timo(int *, const char *, int, struct simplelock *); int midi_sleep(int *, const char *, struct simplelock *); void midi_wakeup(int *); void midi_initbuf(struct midi_buffer *); void midi_xmt_asense(void *); void midi_rcv_asense(void *); void midi_softintr_rd(void *); void midi_softintr_wr(void *); int midiprobe(struct device *, struct cfdata *, void *); void midiattach(struct device *, struct device *, void *); int mididetach(struct device *, int); int midiactivate(struct device *, enum devact); dev_type_open(midiopen); dev_type_close(midiclose); dev_type_read(midiread); dev_type_write(midiwrite); dev_type_ioctl(midiioctl); dev_type_poll(midipoll); dev_type_kqfilter(midikqfilter); const struct cdevsw midi_cdevsw = { midiopen, midiclose, midiread, midiwrite, midiioctl, nostop, notty, midipoll, nommap, midikqfilter, D_OTHER, }; CFATTACH_DECL(midi, sizeof(struct midi_softc), midiprobe, midiattach, mididetach, midiactivate); #define MIDI_XMT_ASENSE_PERIOD mstohz(275) #define MIDI_RCV_ASENSE_PERIOD mstohz(300) extern struct cfdriver midi_cd; int midiprobe(struct device *parent, struct cfdata *match, void *aux) { struct audio_attach_args *sa = aux; DPRINTFN(2,("midiprobe: type=%d sa=%p hw=%p\n", sa->type, sa, sa->hwif)); return (sa->type == AUDIODEV_TYPE_MIDI); } void midiattach(struct device *parent, struct device *self, void *aux) { struct midi_softc *sc = (void *)self; struct audio_attach_args *sa = aux; const struct midi_hw_if *hwp = sa->hwif; void *hdlp = sa->hdl; aprint_naive("\n"); DPRINTFN(2, ("MIDI attach\n")); #ifdef DIAGNOSTIC if (hwp == 0 || hwp->open == 0 || hwp->close == 0 || hwp->output == 0 || hwp->getinfo == 0) { printf("midi: missing method\n"); return; } #endif sc->hw_if = hwp; sc->hw_hdl = hdlp; midi_attach(sc, parent); if (!device_pmf_is_registered(self)) if (!pmf_device_register(self, NULL, NULL)) aprint_error_dev(self, "couldn't establish power handler\n"); } int midiactivate(struct device *self, enum devact act) { struct midi_softc *sc = (struct midi_softc *)self; switch (act) { case DVACT_ACTIVATE: return (EOPNOTSUPP); case DVACT_DEACTIVATE: sc->dying = 1; break; } return (0); } int mididetach(struct device *self, int flags) { struct midi_softc *sc = (struct midi_softc *)self; int maj, mn; DPRINTFN(2,("midi_detach: sc=%p flags=%d\n", sc, flags)); pmf_device_deregister(self); sc->dying = 1; wakeup(&sc->wchan); wakeup(&sc->rchan); /* locate the major number */ maj = cdevsw_lookup_major(&midi_cdevsw); /* Nuke the vnodes for any open instances (calls close). */ mn = device_unit(self); vdevgone(maj, mn, mn, VCHR); if ( !(sc->props & MIDI_PROP_NO_OUTPUT) ) { evcnt_detach(&sc->xmt.bytesDiscarded); evcnt_detach(&sc->xmt.incompleteMessages); } if ( sc->props & MIDI_PROP_CAN_INPUT ) { evcnt_detach(&sc->rcv.bytesDiscarded); evcnt_detach(&sc->rcv.incompleteMessages); } if (sc->sih_rd != NULL) { softint_disestablish(sc->sih_rd); sc->sih_rd = NULL; } if (sc->sih_wr != NULL) { softint_disestablish(sc->sih_wr); sc->sih_wr = NULL; } return (0); } void midi_attach(struct midi_softc *sc, struct device *parent) { struct midi_info mi; int s; callout_init(&sc->xmt_asense_co, 0); callout_init(&sc->rcv_asense_co, 0); callout_setfunc(&sc->xmt_asense_co, midi_xmt_asense, sc); callout_setfunc(&sc->rcv_asense_co, midi_rcv_asense, sc); simple_lock_init(&sc->out_lock); simple_lock_init(&sc->in_lock); sc->dying = 0; sc->isopen = 0; sc->sc_dev = parent; sc->sih_rd = softint_establish(SOFTINT_SERIAL, midi_softintr_rd, sc); sc->sih_wr = softint_establish(SOFTINT_SERIAL, midi_softintr_wr, sc); s = splaudio(); simple_lock(&hwif_register_lock); hwif_softc = sc; sc->hw_if->getinfo(sc->hw_hdl, &mi); hwif_softc = NULL; simple_unlock(&hwif_register_lock); splx(s); sc->props = mi.props; if ( !(sc->props & MIDI_PROP_NO_OUTPUT) ) { evcnt_attach_dynamic(&sc->xmt.bytesDiscarded, EVCNT_TYPE_MISC, NULL, sc->dev.dv_xname, "xmt bytes discarded"); evcnt_attach_dynamic(&sc->xmt.incompleteMessages, EVCNT_TYPE_MISC, NULL, sc->dev.dv_xname, "xmt incomplete msgs"); } if ( sc->props & MIDI_PROP_CAN_INPUT ) { evcnt_attach_dynamic(&sc->rcv.bytesDiscarded, EVCNT_TYPE_MISC, NULL, sc->dev.dv_xname, "rcv bytes discarded"); evcnt_attach_dynamic(&sc->rcv.incompleteMessages, EVCNT_TYPE_MISC, NULL, sc->dev.dv_xname, "rcv incomplete msgs"); } aprint_normal(": %s%s\n", mi.name, (sc->props & (MIDI_PROP_OUT_INTR|MIDI_PROP_NO_OUTPUT)) ? "" : " (CPU-intensive output)"); } void midi_register_hw_if_ext(struct midi_hw_if_ext *exthw) { if ( hwif_softc != NULL ) /* ignore calls resulting from non-init */ hwif_softc->hw_if_ext = exthw; /* uses of getinfo */ } int midi_unit_count(void) { int i; for ( i = 0; i < midi_cd.cd_ndevs; ++i ) if ( NULL == midi_cd.cd_devs[i] ) break; return i; } void midi_initbuf(struct midi_buffer *mb) { mb->idx_producerp = mb->idx_consumerp = mb->idx; mb->buf_producerp = mb->buf_consumerp = mb->buf; } #define PACK_MB_IDX(cat,len) (((cat)<<4)|(len)) #define MB_IDX_CAT(idx) ((idx)>>4) #define MB_IDX_LEN(idx) ((idx)&0xf) int midi_sleep_timo(int *chan, const char *label, int timo, struct simplelock *lk) { int st; if (!label) label = "midi"; DPRINTFN(8, ("midi_sleep_timo: %p %s %d\n", chan, label, timo)); *chan = 1; st = ltsleep(chan, PWAIT | PCATCH, label, timo, lk); *chan = 0; #ifdef MIDI_DEBUG if (st != 0) printf("midi_sleep: %d\n", st); #endif return st; } int midi_sleep(int *chan, const char *label, struct simplelock *lk) { return midi_sleep_timo(chan, label, 0, lk); } void midi_wakeup(int *chan) { if (*chan) { DPRINTFN(8, ("midi_wakeup: %p\n", chan)); wakeup(chan); *chan = 0; } } /* in midivar.h: #define MIDI_CAT_DATA 0 #define MIDI_CAT_STATUS1 1 #define MIDI_CAT_STATUS2 2 #define MIDI_CAT_COMMON 3 */ static char const midi_cats[] = "\0\0\0\0\0\0\0\0\2\2\2\2\1\1\2\3"; #define MIDI_CAT(d) (midi_cats[((d)>>4)&15]) #define FST_RETURN(offp,endp,ret) \ return (s->pos=s->msg+(offp)), (s->end=s->msg+(endp)), (ret) enum fst_ret { FST_CHN, FST_CHV, FST_COM, FST_SYX, FST_RT, FST_MORE, FST_ERR, FST_HUH, FST_SXP }; enum fst_form { FST_CANON, FST_COMPR, FST_VCOMP }; static struct { int off; enum fst_ret tag; } const midi_forms[] = { [FST_CANON] = { .off=0, .tag=FST_CHN }, [FST_COMPR] = { .off=1, .tag=FST_CHN }, [FST_VCOMP] = { .off=0, .tag=FST_CHV } }; #define FST_CRETURN(endp) \ FST_RETURN(midi_forms[form].off,endp,midi_forms[form].tag) /* * A MIDI finite state transducer suitable for receiving or transmitting. It * will accept correct MIDI input that uses, doesn't use, or sometimes uses the * 'running status' compression technique, and transduce it to fully expanded * (form=FST_CANON) or fully compressed (form=FST_COMPR or FST_VCOMP) form. * * Returns FST_MORE if a complete message has not been parsed yet (SysEx * messages are the exception), FST_ERR or FST_HUH if the input does not * conform to the protocol, or FST_CHN (channel messages), FST_COM (System * Common messages), FST_RT (System Real-Time messages), or FST_SYX (System * Exclusive) to broadly categorize the message parsed. s->pos and s->end * locate the parsed message; while (s->posend) putchar(*(s->pos++)); * would output it. * * FST_HUH means the character c wasn't valid in the original state, but the * state has now been reset to START and the caller should try again passing * the same c. FST_ERR means c isn't valid in the start state; the caller * should kiss it goodbye and continue to try successive characters from the * input until something other than FST_ERR or FST_HUH is returned, at which * point things are resynchronized. * * A FST_SYX return means that between pos and end are from 1 to 3 * bytes of a system exclusive message. A SysEx message will be delivered in * one or more chunks of that form, where the first begins with 0xf0 and the * last (which is the only one that might have length < 3) ends with 0xf7. * * Messages corrupted by a protocol error are discarded and won't be seen at * all; again SysEx is the exception, as one or more chunks of it may already * have been parsed. * * For FST_CHN messages, s->msg[0] always contains the status byte even if * FST_COMPR form was requested (pos then points to msg[1]). That way, the * caller can always identify the exact message if there is a need to do so. * For all other message types except FST_SYX, the status byte is at *pos * (which may not necessarily be msg[0]!). There is only one SysEx status * byte, so the return value FST_SYX is sufficient to identify it. * * To simplify some use cases, compression can also be requested with * form=FST_VCOMP. In this form a compressible channel message is indicated * by returning a classification of FST_CHV instead of FST_CHN, and pos points * to the status byte rather than being advanced past it. If the caller in this * case saves the bytes from pos to end, it will have saved the entire message, * and can act on the FST_CHV tag to drop the first byte later. In this form, * unlike FST_CANON, hidden note-off (i.e. note-on with velocity 0) may occur. * * Two obscure points in the MIDI protocol complicate things further, both to * do with the EndSysEx code, 0xf7. First, this code is permitted (and * meaningless) outside of a System Exclusive message, anywhere a status byte * could appear. Second, it is allowed to be absent at the end of a System * Exclusive message (!) - any status byte at all (non-realtime) is allowed to * terminate the message. Both require accomodation in the interface to * midi_fst's caller. A stray 0xf7 should be ignored BUT should count as a * message received for purposes of Active Sense timeout; the case is * represented by a return of FST_COM with a length of zero (pos == end). A * status byte other than 0xf7 during a system exclusive message will cause an * FST_SXP (sysex plus) return; the bytes from pos to end are the end of the * system exclusive message, and after handling those the caller should call * midi_fst again with the same input byte. * * midi(4) will never produce either such form of rubbish. */ static enum fst_ret midi_fst(struct midi_state *s, u_char c, enum fst_form form) { int syxpos = 0; if ( c >= 0xf8 ) { /* All realtime messages bypass state machine */ if ( c == 0xf9 || c == 0xfd ) { DPRINTF( ("midi_fst: s=%p c=0x%02x undefined\n", s, c)); s->bytesDiscarded.ev_count++; return FST_ERR; } DPRINTFN(9, ("midi_fst: s=%p System Real-Time data=0x%02x\n", s, c)); s->msg[2] = c; FST_RETURN(2,3,FST_RT); } DPRINTFN(4, ("midi_fst: s=%p data=0x%02x state=%d\n", s, c, s->state)); switch ( s->state | MIDI_CAT(c) ) { /* break ==> return FST_MORE */ case MIDI_IN_START | MIDI_CAT_COMMON: case MIDI_IN_RUN1_1 | MIDI_CAT_COMMON: case MIDI_IN_RUN2_2 | MIDI_CAT_COMMON: case MIDI_IN_RXX2_2 | MIDI_CAT_COMMON: s->msg[0] = c; switch ( c ) { case 0xf0: s->state = MIDI_IN_SYX1_3; break; case 0xf1: s->state = MIDI_IN_COM0_1; break; case 0xf2: s->state = MIDI_IN_COM0_2; break; case 0xf3: s->state = MIDI_IN_COM0_1; break; case 0xf6: s->state = MIDI_IN_START; FST_RETURN(0,1,FST_COM); case 0xf7: s->state = MIDI_IN_START; FST_RETURN(0,0,FST_COM); default: goto protocol_violation; } break; case MIDI_IN_RUN1_1 | MIDI_CAT_STATUS1: if ( c == s->msg[0] ) { s->state = MIDI_IN_RNX0_1; break; } /* FALLTHROUGH */ case MIDI_IN_RUN2_2 | MIDI_CAT_STATUS1: case MIDI_IN_RXX2_2 | MIDI_CAT_STATUS1: case MIDI_IN_START | MIDI_CAT_STATUS1: s->state = MIDI_IN_RUN0_1; s->msg[0] = c; break; case MIDI_IN_RUN2_2 | MIDI_CAT_STATUS2: case MIDI_IN_RXX2_2 | MIDI_CAT_STATUS2: if ( c == s->msg[0] ) { s->state = MIDI_IN_RNX0_2; break; } if ( (c ^ s->msg[0]) == 0x10 && (c & 0xe0) == 0x80 ) { s->state = MIDI_IN_RXX0_2; s->msg[0] = c; break; } /* FALLTHROUGH */ case MIDI_IN_RUN1_1 | MIDI_CAT_STATUS2: case MIDI_IN_START | MIDI_CAT_STATUS2: s->state = MIDI_IN_RUN0_2; s->msg[0] = c; break; case MIDI_IN_COM0_1 | MIDI_CAT_DATA: s->state = MIDI_IN_START; s->msg[1] = c; FST_RETURN(0,2,FST_COM); case MIDI_IN_COM0_2 | MIDI_CAT_DATA: s->state = MIDI_IN_COM1_2; s->msg[1] = c; break; case MIDI_IN_COM1_2 | MIDI_CAT_DATA: s->state = MIDI_IN_START; s->msg[2] = c; FST_RETURN(0,3,FST_COM); case MIDI_IN_RUN0_1 | MIDI_CAT_DATA: s->state = MIDI_IN_RUN1_1; s->msg[1] = c; FST_RETURN(0,2,FST_CHN); case MIDI_IN_RUN1_1 | MIDI_CAT_DATA: case MIDI_IN_RNX0_1 | MIDI_CAT_DATA: s->state = MIDI_IN_RUN1_1; s->msg[1] = c; FST_CRETURN(2); case MIDI_IN_RUN0_2 | MIDI_CAT_DATA: s->state = MIDI_IN_RUN1_2; s->msg[1] = c; break; case MIDI_IN_RUN1_2 | MIDI_CAT_DATA: if ( FST_CANON == form && 0 == c && (s->msg[0]&0xf0) == 0x90 ) { s->state = MIDI_IN_RXX2_2; s->msg[0] ^= 0x10; s->msg[2] = 64; } else { s->state = MIDI_IN_RUN2_2; s->msg[2] = c; } FST_RETURN(0,3,FST_CHN); case MIDI_IN_RUN2_2 | MIDI_CAT_DATA: s->state = MIDI_IN_RNX1_2; s->msg[1] = c; break; case MIDI_IN_RXX2_2 | MIDI_CAT_DATA: s->state = MIDI_IN_RXX1_2; s->msg[0] ^= 0x10; s->msg[1] = c; break; case MIDI_IN_RNX0_2 | MIDI_CAT_DATA: s->state = MIDI_IN_RNY1_2; s->msg[1] = c; break; case MIDI_IN_RXX0_2 | MIDI_CAT_DATA: s->state = MIDI_IN_RXY1_2; s->msg[1] = c; break; case MIDI_IN_RNX1_2 | MIDI_CAT_DATA: case MIDI_IN_RNY1_2 | MIDI_CAT_DATA: if ( FST_CANON == form && 0 == c && (s->msg[0]&0xf0) == 0x90 ) { s->state = MIDI_IN_RXX2_2; s->msg[0] ^= 0x10; s->msg[2] = 64; FST_RETURN(0,3,FST_CHN); } s->state = MIDI_IN_RUN2_2; s->msg[2] = c; FST_CRETURN(3); case MIDI_IN_RXX1_2 | MIDI_CAT_DATA: case MIDI_IN_RXY1_2 | MIDI_CAT_DATA: if ( ( 0 == c && (s->msg[0]&0xf0) == 0x90) || (64 == c && (s->msg[0]&0xf0) == 0x80 && FST_CANON != form) ) { s->state = MIDI_IN_RXX2_2; s->msg[0] ^= 0x10; s->msg[2] = 64 - c; FST_CRETURN(3); } s->state = MIDI_IN_RUN2_2; s->msg[2] = c; FST_RETURN(0,3,FST_CHN); case MIDI_IN_SYX1_3 | MIDI_CAT_DATA: s->state = MIDI_IN_SYX2_3; s->msg[1] = c; break; case MIDI_IN_SYX2_3 | MIDI_CAT_DATA: s->state = MIDI_IN_SYX0_3; s->msg[2] = c; FST_RETURN(0,3,FST_SYX); case MIDI_IN_SYX0_3 | MIDI_CAT_DATA: s->state = MIDI_IN_SYX1_3; s->msg[0] = c; break; case MIDI_IN_SYX2_3 | MIDI_CAT_COMMON: case MIDI_IN_SYX2_3 | MIDI_CAT_STATUS1: case MIDI_IN_SYX2_3 | MIDI_CAT_STATUS2: ++ syxpos; /* FALLTHROUGH */ case MIDI_IN_SYX1_3 | MIDI_CAT_COMMON: case MIDI_IN_SYX1_3 | MIDI_CAT_STATUS1: case MIDI_IN_SYX1_3 | MIDI_CAT_STATUS2: ++ syxpos; /* FALLTHROUGH */ case MIDI_IN_SYX0_3 | MIDI_CAT_COMMON: case MIDI_IN_SYX0_3 | MIDI_CAT_STATUS1: case MIDI_IN_SYX0_3 | MIDI_CAT_STATUS2: s->state = MIDI_IN_START; if ( c == 0xf7 ) { s->msg[syxpos] = c; FST_RETURN(0,1+syxpos,FST_SYX); } s->msg[syxpos] = 0xf7; FST_RETURN(0,1+syxpos,FST_SXP); default: protocol_violation: DPRINTF(("midi_fst: unexpected %#02x in state %u\n", c, s->state)); switch ( s->state ) { case MIDI_IN_RUN1_1: /* can only get here by seeing an */ case MIDI_IN_RUN2_2: /* INVALID System Common message */ case MIDI_IN_RXX2_2: s->state = MIDI_IN_START; /* FALLTHROUGH */ case MIDI_IN_START: s->bytesDiscarded.ev_count++; return FST_ERR; case MIDI_IN_COM1_2: case MIDI_IN_RUN1_2: case MIDI_IN_RNY1_2: case MIDI_IN_RXY1_2: s->bytesDiscarded.ev_count++; /* FALLTHROUGH */ case MIDI_IN_COM0_1: case MIDI_IN_RUN0_1: case MIDI_IN_RNX0_1: case MIDI_IN_COM0_2: case MIDI_IN_RUN0_2: case MIDI_IN_RNX0_2: case MIDI_IN_RXX0_2: case MIDI_IN_RNX1_2: case MIDI_IN_RXX1_2: s->bytesDiscarded.ev_count++; s->incompleteMessages.ev_count++; break; #if defined(AUDIO_DEBUG) || defined(DIAGNOSTIC) default: printf("midi_fst: mishandled %#02x(%u) in state %u?!\n", c, MIDI_CAT(c), s->state); #endif } s->state = MIDI_IN_START; return FST_HUH; } return FST_MORE; } void midi_softintr_rd(void *cookie) { struct midi_softc *sc = cookie; struct proc *p; if (sc->async != NULL) { mutex_enter(&proclist_mutex); if ((p = sc->async) != NULL) psignal(p, SIGIO); mutex_exit(&proclist_mutex); } midi_wakeup(&sc->rchan); selnotify(&sc->rsel, 0); /* filter will spin if locked */ } void midi_softintr_wr(void *cookie) { struct midi_softc *sc = cookie; struct proc *p; if (sc->async != NULL) { mutex_enter(&proclist_mutex); if ((p = sc->async) != NULL) psignal(p, SIGIO); mutex_exit(&proclist_mutex); } midi_wakeup(&sc->wchan); selnotify(&sc->wsel, 0); /* filter will spin if locked */ } void midi_in(void *addr, int data) { struct midi_softc *sc = addr; struct midi_buffer *mb = &sc->inbuf; int i; int count; enum fst_ret got; int s; /* hw may have various spls so impose our own */ MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); if (!sc->isopen) return; if (!(sc->flags & FREAD)) return; /* discard data if not reading */ sxp_again: do got = midi_fst(&sc->rcv, data, FST_CANON); while ( got == FST_HUH ); switch ( got ) { case FST_MORE: case FST_ERR: return; case FST_CHN: case FST_COM: case FST_RT: #if NSEQUENCER > 0 if (sc->seqopen) { extern void midiseq_in(struct midi_dev *,u_char *,int); count = sc->rcv.end - sc->rcv.pos; midiseq_in(sc->seq_md, sc->rcv.pos, count); return; } #endif /* * Pass Active Sense to the sequencer if it's open, but not to * a raw reader. (Really should do something intelligent with * it then, though....) */ if ( got == FST_RT && MIDI_ACK == sc->rcv.pos[0] ) { if ( !sc->rcv_expect_asense ) { sc->rcv_expect_asense = 1; callout_schedule(&sc->rcv_asense_co, MIDI_RCV_ASENSE_PERIOD); } sc->rcv_quiescent = 0; sc->rcv_eof = 0; return; } /* FALLTHROUGH */ /* * Ultimately SysEx msgs should be offered to the sequencer also; the * sequencer API addresses them - but maybe our sequencer can't handle * them yet, so offer only to raw reader. (Which means, ultimately, * discard them if the sequencer's open, as it's not doing reads!) * -> When SysEx support is added to the sequencer, be sure to handle * FST_SXP there too. */ case FST_SYX: case FST_SXP: count = sc->rcv.end - sc->rcv.pos; MIDI_IN_LOCK(sc,s); sc->rcv_quiescent = 0; sc->rcv_eof = 0; if ( 0 == count ) { MIDI_IN_UNLOCK(sc,s); break; } MIDI_BUF_PRODUCER_INIT(mb,idx); MIDI_BUF_PRODUCER_INIT(mb,buf); if (count > buf_lim - buf_cur || 1 > idx_lim - idx_cur) { sc->rcv.bytesDiscarded.ev_count += count; MIDI_IN_UNLOCK(sc,s); DPRINTF(("midi_in: buffer full, discard data=0x%02x\n", sc->rcv.pos[0])); return; } for (i = 0; i < count; i++) { *buf_cur++ = sc->rcv.pos[i]; MIDI_BUF_WRAP(buf); } *idx_cur++ = PACK_MB_IDX(got,count); MIDI_BUF_WRAP(idx); MIDI_BUF_PRODUCER_WBACK(mb,buf); MIDI_BUF_PRODUCER_WBACK(mb,idx); MIDI_IN_UNLOCK(sc,s); softint_schedule(sc->sih_rd); break; default: /* don't #ifdef this away, gcc will say FST_HUH not handled */ printf("midi_in: midi_fst returned %d?!\n", got); } if ( FST_SXP == got ) goto sxp_again; } void midi_out(void *addr) { struct midi_softc *sc = addr; if (!sc->isopen) return; DPRINTFN(8, ("midi_out: %p\n", sc)); midi_intr_out(sc); } int midiopen(dev_t dev, int flags, int ifmt, struct lwp *l) { struct midi_softc *sc; const struct midi_hw_if *hw; int error; sc = device_lookup(&midi_cd, MIDIUNIT(dev)); if (sc == NULL) return (ENXIO); if (sc->dying) return (EIO); DPRINTFN(3,("midiopen %p\n", sc)); hw = sc->hw_if; if (!hw) return ENXIO; if (sc->isopen) return EBUSY; /* put both state machines into known states */ sc->rcv.state = MIDI_IN_START; sc->rcv.pos = sc->rcv.msg; sc->rcv.end = sc->rcv.msg; sc->xmt.state = MIDI_IN_START; sc->xmt.pos = sc->xmt.msg; sc->xmt.end = sc->xmt.msg; /* copy error counters so an ioctl (TBA) can give since-open stats */ sc->rcv.atOpen.bytesDiscarded = sc->rcv.bytesDiscarded.ev_count; sc->rcv.atQuery.bytesDiscarded = sc->rcv.bytesDiscarded.ev_count; sc->xmt.atOpen.bytesDiscarded = sc->xmt.bytesDiscarded.ev_count; sc->xmt.atQuery.bytesDiscarded = sc->xmt.bytesDiscarded.ev_count; /* and the buffers */ midi_initbuf(&sc->outbuf); midi_initbuf(&sc->inbuf); /* and the receive flags */ sc->rcv_expect_asense = 0; sc->rcv_quiescent = 0; sc->rcv_eof = 0; error = hw->open(sc->hw_hdl, flags, midi_in, midi_out, sc); if (error) return error; sc->isopen++; sc->flags = flags; sc->rchan = 0; sc->wchan = 0; sc->pbus = 0; sc->async = 0; #ifdef MIDI_SAVE if (midicnt != 0) { midisave.cnt = midicnt; midicnt = 0; } #endif return 0; } int midiclose(dev_t dev, int flags, int ifmt, struct lwp *l) { int unit = MIDIUNIT(dev); struct midi_softc *sc = midi_cd.cd_devs[unit]; const struct midi_hw_if *hw = sc->hw_if; int s, error; DPRINTFN(3,("midiclose %p\n", sc)); /* midi_start_output(sc); anything buffered => pbus already set! */ error = 0; MIDI_OUT_LOCK(sc,s); while (sc->pbus) { DPRINTFN(8,("midiclose sleep ...\n")); error = midi_sleep_timo(&sc->wchan, "mid_dr", 30*hz, &sc->out_lock); } sc->isopen = 0; MIDI_OUT_UNLOCK(sc,s); callout_stop(&sc->xmt_asense_co); /* xxx fix this - sleep? */ callout_stop(&sc->rcv_asense_co); hw->close(sc->hw_hdl); #if NSEQUENCER > 0 sc->seqopen = 0; sc->seq_md = 0; #endif return 0; } int midiread(dev_t dev, struct uio *uio, int ioflag) { int unit = MIDIUNIT(dev); struct midi_softc *sc = midi_cd.cd_devs[unit]; struct midi_buffer *mb = &sc->inbuf; int error; int s; MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); int appetite; int first = 1; DPRINTFN(6,("midiread: %p, count=%lu\n", sc, (unsigned long)uio->uio_resid)); if (sc->dying) return EIO; if ( !(sc->props & MIDI_PROP_CAN_INPUT) ) return ENXIO; MIDI_IN_LOCK(sc,s); MIDI_BUF_CONSUMER_INIT(mb,idx); MIDI_BUF_CONSUMER_INIT(mb,buf); MIDI_IN_UNLOCK(sc,s); error = 0; for ( ;; ) { /* * If the used portion of idx wraps around the end, just take * the first part on this iteration, and we'll get the rest on * the next. */ if ( idx_lim > idx_end ) idx_lim = idx_end; /* * Count bytes through the last complete message that will * fit in the requested read. */ for (appetite = uio->uio_resid; idx_cur < idx_lim; ++idx_cur) { if ( appetite < MB_IDX_LEN(*idx_cur) ) break; appetite -= MB_IDX_LEN(*idx_cur); } appetite = uio->uio_resid - appetite; /* * Only if the read is too small to hold even the first * complete message will we return a partial one (updating idx * to reflect the remaining length of the message). */ if ( appetite == 0 && idx_cur < idx_lim ) { if ( !first ) goto unlocked_exit; /* idx_cur not advanced */ appetite = uio->uio_resid; *idx_cur = PACK_MB_IDX(MB_IDX_CAT(*idx_cur), MB_IDX_LEN(*idx_cur) - appetite); } KASSERT(buf_cur + appetite <= buf_lim); /* move the bytes */ if ( appetite > 0 ) { first = 0; /* we know we won't return empty-handed */ /* do two uiomoves if data wrap around end of buf */ if ( buf_cur + appetite > buf_end ) { DPRINTFN(8, ("midiread: uiomove cc=%td (prewrap)\n", buf_end - buf_cur)); error = uiomove(buf_cur, buf_end-buf_cur, uio); if ( error ) goto unlocked_exit; appetite -= buf_end - buf_cur; buf_cur = mb->buf; } DPRINTFN(8, ("midiread: uiomove cc=%d\n", appetite)); error = uiomove(buf_cur, appetite, uio); if ( error ) goto unlocked_exit; buf_cur += appetite; } MIDI_BUF_WRAP(idx); MIDI_BUF_WRAP(buf); MIDI_IN_LOCK(sc,s); MIDI_BUF_CONSUMER_WBACK(mb,idx); MIDI_BUF_CONSUMER_WBACK(mb,buf); if ( 0 == uio->uio_resid ) /* if read satisfied, we're done */ break; MIDI_BUF_CONSUMER_REFRESH(mb,idx); if ( idx_cur == idx_lim ) { /* need to wait for data? */ if ( !first || sc->rcv_eof ) /* never block reader if */ break; /* any data already in hand */ if (ioflag & IO_NDELAY) { error = EWOULDBLOCK; break; } error = midi_sleep(&sc->rchan, "mid rd", &sc->in_lock); if ( error ) break; MIDI_BUF_CONSUMER_REFRESH(mb,idx); /* what'd we get? */ } MIDI_BUF_CONSUMER_REFRESH(mb,buf); MIDI_IN_UNLOCK(sc,s); if ( sc->dying ) return EIO; } MIDI_IN_UNLOCK(sc,s); unlocked_exit: return error; } void midi_rcv_asense(void *arg) { struct midi_softc *sc = arg; int s; if ( sc->dying || !sc->isopen ) return; if ( sc->rcv_quiescent ) { MIDI_IN_LOCK(sc,s); sc->rcv_eof = 1; sc->rcv_quiescent = 0; sc->rcv_expect_asense = 0; MIDI_IN_UNLOCK(sc,s); softint_schedule(sc->sih_rd); return; } sc->rcv_quiescent = 1; callout_schedule(&sc->rcv_asense_co, MIDI_RCV_ASENSE_PERIOD); } void midi_xmt_asense(void *arg) { struct midi_softc *sc = arg; int s; int error; int armed; if ( sc->dying || !sc->isopen ) return; MIDI_OUT_LOCK(sc,s); if ( sc->pbus || sc->dying || !sc->isopen ) { MIDI_OUT_UNLOCK(sc,s); return; } sc->pbus = 1; DPRINTFN(8,("midi_xmt_asense: %p\n", sc)); if ( sc->props & MIDI_PROP_OUT_INTR ) { error = sc->hw_if->output(sc->hw_hdl, MIDI_ACK); armed = (error == 0); } else { /* polled output, do with interrupts unmasked */ MIDI_OUT_UNLOCK(sc,s); /* running from softclock, so top half won't sneak in here */ error = sc->hw_if->output(sc->hw_hdl, MIDI_ACK); MIDI_OUT_LOCK(sc,s); armed = 0; } if ( !armed ) { sc->pbus = 0; callout_schedule(&sc->xmt_asense_co, MIDI_XMT_ASENSE_PERIOD); } MIDI_OUT_UNLOCK(sc,s); } /* * The way this function was hacked up to plug into poll_out and intr_out * after they were written won't win it any beauty contests, but it'll work * (code in haste, refactor at leisure). This may be called with the lock * (by intr_out) or without the lock (by poll_out) so it only does what could * be safe either way. */ int midi_msg_out(struct midi_softc *sc, u_char **idx, u_char **idxl, u_char **buf, u_char **bufl) { MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); MIDI_BUF_EXTENT_INIT(&sc->outbuf,idx); MIDI_BUF_EXTENT_INIT(&sc->outbuf,buf); int length; int error; u_char contig[3]; u_char *cp; u_char *ep; idx_cur = *idx; idx_lim = *idxl; buf_cur = *buf; buf_lim = *bufl; length = MB_IDX_LEN(*idx_cur); for ( cp = contig, ep = cp + length; cp < ep; ) { *cp++ = *buf_cur++; MIDI_BUF_WRAP(buf); } cp = contig; switch ( MB_IDX_CAT(*idx_cur) ) { case FST_CHV: /* chnmsg to be compressed (for device that wants it) */ ++ cp; -- length; /* FALLTHROUGH */ case FST_CHN: error = sc->hw_if_ext->channel(sc->hw_hdl, MIDI_GET_STATUS(contig[0]), MIDI_GET_CHAN(contig[0]), cp, length); break; case FST_COM: error = sc->hw_if_ext->common(sc->hw_hdl, MIDI_GET_STATUS(contig[0]), cp, length); break; case FST_SYX: case FST_SXP: error = sc->hw_if_ext->sysex(sc->hw_hdl, cp, length); break; case FST_RT: error = sc->hw_if->output(sc->hw_hdl, *cp); break; default: error = EIO; } if ( !error ) { ++ idx_cur; MIDI_BUF_WRAP(idx); *idx = idx_cur; *idxl = idx_lim; *buf = buf_cur; *bufl = buf_lim; } return error; } /* * midi_poll_out is intended for the midi hw (the vast majority of MIDI UARTs * on sound cards, apparently) that _do not have transmit-ready interrupts_. * Every call to hw_if->output for one of these may busy-wait to output the * byte; at the standard midi data rate that'll be 320us per byte. The * technique of writing only MIDI_MAX_WRITE bytes in a row and then waiting * for MIDI_WAIT does not reduce the total time spent busy-waiting, and it * adds arbitrary delays in transmission (and, since MIDI_WAIT is roughly the * same as the time to send MIDI_MAX_WRITE bytes, it effectively halves the * data rate). Here, a somewhat bolder approach is taken. Since midi traffic * is bursty but time-sensitive--most of the time there will be none at all, * but when there is it should go out ASAP--the strategy is to just get it * over with, and empty the buffer in one go. The effect this can have on * the rest of the system will be limited by the size of the buffer and the * sparseness of the traffic. But some precautions are in order. Interrupts * should all be unmasked when this is called, and midiwrite should not fill * the buffer more than once (when MIDI_PROP_CAN_INTR is false) without a * yield() so some other process can get scheduled. If the write is nonblocking, * midiwrite should return a short count rather than yield. * * Someday when there is fine-grained MP support, this should be reworked to * run in a callout so the writing process really could proceed concurrently. * But obviously where performance is a concern, interrupt-driven hardware * such as USB midi or (apparently) clcs will always be preferable. And it * seems (kern/32651) that many of the devices currently working in poll mode * may really have tx interrupt capability and want only implementation; that * ought to happen. */ int midi_poll_out(struct midi_softc *sc) { struct midi_buffer *mb = &sc->outbuf; int error; int msglen; int s; MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); error = 0; MIDI_OUT_LOCK(sc,s); MIDI_BUF_CONSUMER_INIT(mb,idx); MIDI_BUF_CONSUMER_INIT(mb,buf); MIDI_OUT_UNLOCK(sc,s); for ( ;; ) { while ( idx_cur != idx_lim ) { if ( sc->hw_if_ext ) { error = midi_msg_out(sc, &idx_cur, &idx_lim, &buf_cur, &buf_lim); if ( error ) goto ioerror; continue; } /* or, lacking hw_if_ext ... */ msglen = MB_IDX_LEN(*idx_cur); DPRINTFN(7,("midi_poll_out: %p <- %#02x\n", sc->hw_hdl, *buf_cur)); error = sc->hw_if->output(sc->hw_hdl, *buf_cur); if ( error ) goto ioerror; ++ buf_cur; MIDI_BUF_WRAP(buf); -- msglen; if ( msglen ) *idx_cur = PACK_MB_IDX(MB_IDX_CAT(*idx_cur), msglen); else { ++ idx_cur; MIDI_BUF_WRAP(idx); } } KASSERT(buf_cur == buf_lim); MIDI_OUT_LOCK(sc,s); MIDI_BUF_CONSUMER_WBACK(mb,idx); MIDI_BUF_CONSUMER_WBACK(mb,buf); MIDI_BUF_CONSUMER_REFRESH(mb,idx); /* any more to transmit? */ MIDI_BUF_CONSUMER_REFRESH(mb,buf); if ( idx_lim == idx_cur ) break; /* still holding lock */ MIDI_OUT_UNLOCK(sc,s); } goto disarm; /* lock held */ ioerror: #if defined(AUDIO_DEBUG) || defined(DIAGNOSTIC) printf("%s: midi_poll_output error %d\n", sc->dev.dv_xname, error); #endif MIDI_OUT_LOCK(sc,s); MIDI_BUF_CONSUMER_WBACK(mb,idx); MIDI_BUF_CONSUMER_WBACK(mb,buf); disarm: sc->pbus = 0; callout_schedule(&sc->xmt_asense_co, MIDI_XMT_ASENSE_PERIOD); MIDI_OUT_UNLOCK(sc,s); return error; } /* * The interrupt flavor acquires spl and lock once and releases at the end, * as it expects to write only one byte or message. The interface convention * is that if hw_if->output returns 0, it has initiated transmission and the * completion interrupt WILL be forthcoming; if it has not returned 0, NO * interrupt will be forthcoming, and if it returns EINPROGRESS it wants * another byte right away. */ int midi_intr_out(struct midi_softc *sc) { struct midi_buffer *mb = &sc->outbuf; int error; int msglen; int s; MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); int armed = 0; error = 0; MIDI_OUT_LOCK(sc,s); MIDI_BUF_CONSUMER_INIT(mb,idx); MIDI_BUF_CONSUMER_INIT(mb,buf); while ( idx_cur != idx_lim ) { if ( sc->hw_if_ext ) { error = midi_msg_out(sc, &idx_cur, &idx_lim, &buf_cur, &buf_lim); if ( !error ) /* no EINPROGRESS from extended hw_if */ armed = 1; break; } /* or, lacking hw_if_ext ... */ msglen = MB_IDX_LEN(*idx_cur); error = sc->hw_if->output(sc->hw_hdl, *buf_cur); if ( error && error != EINPROGRESS ) break; ++ buf_cur; MIDI_BUF_WRAP(buf); -- msglen; if ( msglen ) *idx_cur = PACK_MB_IDX(MB_IDX_CAT(*idx_cur),msglen); else { ++ idx_cur; MIDI_BUF_WRAP(idx); } if ( !error ) { armed = 1; break; } } MIDI_BUF_CONSUMER_WBACK(mb,idx); MIDI_BUF_CONSUMER_WBACK(mb,buf); if ( !armed ) { sc->pbus = 0; callout_schedule(&sc->xmt_asense_co, MIDI_XMT_ASENSE_PERIOD); } MIDI_OUT_UNLOCK(sc,s); softint_schedule(sc->sih_wr); #if defined(AUDIO_DEBUG) || defined(DIAGNOSTIC) if ( error ) printf("%s: midi_intr_output error %d\n", sc->dev.dv_xname, error); #endif return error; } int midi_start_output(struct midi_softc *sc) { if (sc->dying) return EIO; if ( sc->props & MIDI_PROP_OUT_INTR ) return midi_intr_out(sc); return midi_poll_out(sc); } static int real_writebytes(struct midi_softc *sc, u_char *ibuf, int cc) { u_char *iend = ibuf + cc; struct midi_buffer *mb = &sc->outbuf; int arming = 0; int count; int s; int got; enum fst_form form; MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); /* * If the hardware uses the extended hw_if, pass it canonicalized * messages (or compressed ones if it specifically requests, using * VCOMP form so the bottom half can still pass the op and chan along); * if it does not, send it compressed messages (using COMPR form as * there is no need to preserve the status for the bottom half). */ if ( NULL == sc->hw_if_ext ) form = FST_COMPR; else if ( sc->hw_if_ext->compress ) form = FST_VCOMP; else form = FST_CANON; MIDI_OUT_LOCK(sc,s); MIDI_BUF_PRODUCER_INIT(mb,idx); MIDI_BUF_PRODUCER_INIT(mb,buf); MIDI_OUT_UNLOCK(sc,s); if (sc->dying) return EIO; while ( ibuf < iend ) { got = midi_fst(&sc->xmt, *ibuf, form); ++ ibuf; switch ( got ) { case FST_MORE: continue; case FST_ERR: case FST_HUH: return EPROTO; case FST_CHN: case FST_CHV: /* only occurs in VCOMP form */ case FST_COM: case FST_RT: case FST_SYX: case FST_SXP: break; /* go add to buffer */ #if defined(AUDIO_DEBUG) || defined(DIAGNOSTIC) default: printf("midi_wr: midi_fst returned %d?!\n", got); #endif } count = sc->xmt.end - sc->xmt.pos; if ( 0 == count ) /* can happen with stray 0xf7; see midi_fst */ continue; /* * return EWOULDBLOCK if the data passed will not fit in * the buffer; the caller should have taken steps to avoid that. * If got==FST_SXP we lose the new status byte, but we're losing * anyway, so c'est la vie. */ if ( idx_cur == idx_lim || count > buf_lim - buf_cur ) { MIDI_OUT_LOCK(sc,s); MIDI_BUF_PRODUCER_REFRESH(mb,idx); /* get the most */ MIDI_BUF_PRODUCER_REFRESH(mb,buf); /* current facts */ MIDI_OUT_UNLOCK(sc,s); if ( idx_cur == idx_lim || count > buf_lim - buf_cur ) return EWOULDBLOCK; /* caller's problem */ } *idx_cur++ = PACK_MB_IDX(got,count); MIDI_BUF_WRAP(idx); while ( count ) { *buf_cur++ = *(sc->xmt.pos)++; MIDI_BUF_WRAP(buf); -- count; } if ( FST_SXP == got ) -- ibuf; /* again with same status byte */ } MIDI_OUT_LOCK(sc,s); MIDI_BUF_PRODUCER_WBACK(mb,buf); MIDI_BUF_PRODUCER_WBACK(mb,idx); /* * If the output transfer is not already busy, and there is a message * buffered, mark it busy, stop the Active Sense callout (what if we're * too late and it's expired already? No big deal, an extra Active Sense * never hurt anybody) and start the output transfer once we're out of * the critical section (pbus==1 will stop anyone else doing the same). */ MIDI_BUF_CONSUMER_INIT(mb,idx); /* check what consumer's got to read */ if ( !sc->pbus && idx_cur < idx_lim ) { sc->pbus = 1; callout_stop(&sc->xmt_asense_co); arming = 1; } MIDI_OUT_UNLOCK(sc,s); return arming ? midi_start_output(sc) : 0; } int midiwrite(dev_t dev, struct uio *uio, int ioflag) { int unit = MIDIUNIT(dev); struct midi_softc *sc = midi_cd.cd_devs[unit]; struct midi_buffer *mb = &sc->outbuf; int error; u_char inp[256]; int s; MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); size_t idxspace; size_t bufspace; size_t xfrcount; int pollout = 0; DPRINTFN(6, ("midiwrite: %p, unit=%d, count=%lu\n", sc, unit, (unsigned long)uio->uio_resid)); if (sc->dying) return EIO; error = 0; while (uio->uio_resid > 0 && !error) { /* * block if necessary for the minimum buffer space to guarantee * we can write something. */ MIDI_OUT_LOCK(sc,s); MIDI_BUF_PRODUCER_INIT(mb,idx); /* init can't go above loop; */ MIDI_BUF_PRODUCER_INIT(mb,buf); /* real_writebytes moves cur */ for ( ;; ) { idxspace = MIDI_BUF_PRODUCER_REFRESH(mb,idx) - idx_cur; bufspace = MIDI_BUF_PRODUCER_REFRESH(mb,buf) - buf_cur; if ( idxspace >= 1 && bufspace >= 3 && !pollout ) break; DPRINTFN(8,("midi_write: sleep idx=%zd buf=%zd\n", idxspace, bufspace)); if (ioflag & IO_NDELAY) { error = EWOULDBLOCK; /* * If some amount has already been transferred, * the common syscall code will automagically * convert this to success with a short count. */ goto locked_exit; } if ( pollout ) { preempt(); /* see midi_poll_output */ pollout = 0; } else error = midi_sleep(&sc->wchan, "mid wr", &sc->out_lock); if (error) /* * Similarly, the common code will handle * EINTR and ERESTART properly here, changing to * a short count if something transferred. */ goto locked_exit; } MIDI_OUT_UNLOCK(sc,s); /* * The number of bytes we can safely extract from the uio * depends on the available idx and buf space. Worst case, * every byte is a message so 1 idx is required per byte. * Worst case, the first byte completes a 3-byte msg in prior * state, and every subsequent byte is a Program Change or * Channel Pressure msg with running status and expands to 2 * bytes, so the buf space reqd is 3+2(n-1) or 2n+1. So limit * the transfer to the min of idxspace and (bufspace-1)>>1. */ xfrcount = (bufspace - 1) >> 1; if ( xfrcount > idxspace ) xfrcount = idxspace; if ( xfrcount > sizeof inp ) xfrcount = sizeof inp; if ( xfrcount > uio->uio_resid ) xfrcount = uio->uio_resid; error = uiomove(inp, xfrcount, uio); #ifdef MIDI_DEBUG if (error) printf("midi_write:(1) uiomove failed %d; " "xfrcount=%d inp=%p\n", error, xfrcount, inp); #endif if ( error ) break; /* * The number of bytes we extracted being calculated to * definitely fit in the buffer even with canonicalization, * there is no excuse for real_writebytes to return EWOULDBLOCK. */ error = real_writebytes(sc, inp, xfrcount); KASSERT(error != EWOULDBLOCK); if ( error ) break; /* * If this is a polling device and we just sent a buffer, let's * not send another without giving some other process a chance. */ if ( ! (sc->props & MIDI_PROP_OUT_INTR) ) pollout = 1; DPRINTFN(8,("midiwrite: uio_resid now %zu, props=%d\n", uio->uio_resid, sc->props)); } return error; locked_exit: MIDI_OUT_UNLOCK(sc,s); return error; } /* * This write routine is only called from sequencer code and expects * a write that is smaller than the MIDI buffer. */ int midi_writebytes(int unit, u_char *bf, int cc) { struct midi_softc *sc = midi_cd.cd_devs[unit]; DPRINTFN(7, ("midi_writebytes: %p, unit=%d, cc=%d %#02x %#02x %#02x\n", sc, unit, cc, bf[0], bf[1], bf[2])); return real_writebytes(sc, bf, cc); } int midiioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) { int unit = MIDIUNIT(dev); struct midi_softc *sc = midi_cd.cd_devs[unit]; const struct midi_hw_if *hw = sc->hw_if; int error; int s; MIDI_BUF_DECLARE(buf); DPRINTFN(5,("midiioctl: %p cmd=0x%08lx\n", sc, cmd)); if (sc->dying) return EIO; error = 0; switch (cmd) { case FIONBIO: /* All handled in the upper FS layer. */ break; case FIONREAD: /* * This code relies on the current implementation of midi_in * always updating buf and idx together in a critical section, * so buf always ends at a message boundary. Document this * ioctl as always returning a value such that the last message * included is complete (SysEx the only exception), and then * make sure the implementation doesn't regress. NB that * means if this ioctl returns n and the proc then issues a * read of n, n bytes will be read, but if the proc issues a * read of m < n, fewer than m bytes may be read to ensure the * read ends at a message boundary. */ MIDI_IN_LOCK(sc,s); MIDI_BUF_CONSUMER_INIT(&sc->inbuf,buf); MIDI_IN_UNLOCK(sc,s); *(int *)addr = buf_lim - buf_cur; break; case FIOASYNC: if (*(int *)addr) { if (sc->async) return EBUSY; sc->async = l->l_proc; DPRINTFN(5,("midi_ioctl: FIOASYNC %p\n", l->l_proc)); } else sc->async = 0; break; #if 0 case MIDI_PRETIME: /* XXX OSS * This should set up a read timeout, but that's * why we have poll(), so there's nothing yet. */ error = EINVAL; break; #endif #ifdef MIDI_SAVE case MIDI_GETSAVE: error = copyout(&midisave, *(void **)addr, sizeof midisave); break; #endif default: if (hw->ioctl) error = hw->ioctl(sc->hw_hdl, cmd, addr, flag, l); else error = EINVAL; break; } return error; } int midipoll(dev_t dev, int events, struct lwp *l) { int unit = MIDIUNIT(dev); struct midi_softc *sc = midi_cd.cd_devs[unit]; int revents = 0; int s; MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); DPRINTFN(6,("midipoll: %p events=0x%x\n", sc, events)); if (sc->dying) return POLLHUP; s = splaudio(); if ((sc->flags&FREAD) && (events & (POLLIN | POLLRDNORM))) { simple_lock(&sc->in_lock); MIDI_BUF_CONSUMER_INIT(&sc->inbuf,idx); if (idx_cur < idx_lim) revents |= events & (POLLIN | POLLRDNORM); else selrecord(l, &sc->rsel); simple_unlock(&sc->in_lock); } if ((sc->flags&FWRITE) && (events & (POLLOUT | POLLWRNORM))) { simple_lock(&sc->out_lock); MIDI_BUF_PRODUCER_INIT(&sc->outbuf,idx); MIDI_BUF_PRODUCER_INIT(&sc->outbuf,buf); if ( idx_lim - idx_cur >= 1 && buf_lim - buf_cur >= 3 ) revents |= events & (POLLOUT | POLLWRNORM); else selrecord(l, &sc->wsel); simple_unlock(&sc->out_lock); } splx(s); return revents; } static void filt_midirdetach(struct knote *kn) { struct midi_softc *sc = kn->kn_hook; int s; s = splaudio(); SLIST_REMOVE(&sc->rsel.sel_klist, kn, knote, kn_selnext); splx(s); } static int filt_midiread(struct knote *kn, long hint) { struct midi_softc *sc = kn->kn_hook; int s; MIDI_BUF_DECLARE(buf); /* XXXLUKEM (thorpej): please make sure this is correct. */ MIDI_IN_LOCK(sc,s); MIDI_BUF_CONSUMER_INIT(&sc->inbuf,buf); kn->kn_data = buf_lim - buf_cur; MIDI_IN_UNLOCK(sc,s); return (kn->kn_data > 0); } static const struct filterops midiread_filtops = { 1, NULL, filt_midirdetach, filt_midiread }; static void filt_midiwdetach(struct knote *kn) { struct midi_softc *sc = kn->kn_hook; int s; s = splaudio(); SLIST_REMOVE(&sc->wsel.sel_klist, kn, knote, kn_selnext); splx(s); } static int filt_midiwrite(struct knote *kn, long hint) { struct midi_softc *sc = kn->kn_hook; int s; MIDI_BUF_DECLARE(idx); MIDI_BUF_DECLARE(buf); /* XXXLUKEM (thorpej): please make sure this is correct. */ MIDI_OUT_LOCK(sc,s); MIDI_BUF_PRODUCER_INIT(&sc->outbuf,idx); MIDI_BUF_PRODUCER_INIT(&sc->outbuf,buf); kn->kn_data = ((buf_lim - buf_cur)-1)>>1; if ( kn->kn_data > idx_lim - idx_cur ) kn->kn_data = idx_lim - idx_cur; MIDI_OUT_UNLOCK(sc,s); return (kn->kn_data > 0); } static const struct filterops midiwrite_filtops = { 1, NULL, filt_midiwdetach, filt_midiwrite }; int midikqfilter(dev_t dev, struct knote *kn) { int unit = MIDIUNIT(dev); struct midi_softc *sc = midi_cd.cd_devs[unit]; struct klist *klist; int s; switch (kn->kn_filter) { case EVFILT_READ: klist = &sc->rsel.sel_klist; kn->kn_fop = &midiread_filtops; break; case EVFILT_WRITE: klist = &sc->wsel.sel_klist; kn->kn_fop = &midiwrite_filtops; break; default: return (EINVAL); } kn->kn_hook = sc; s = splaudio(); SLIST_INSERT_HEAD(klist, kn, kn_selnext); splx(s); return (0); } void midi_getinfo(dev_t dev, struct midi_info *mi) { struct midi_softc *sc; sc = device_lookup(&midi_cd, MIDIUNIT(dev)); if (sc == NULL) return; if (sc->dying) return; sc->hw_if->getinfo(sc->hw_hdl, mi); } #elif NMIDIBUS > 0 /* but NMIDI == 0 */ void midi_register_hw_if_ext(struct midi_hw_if_ext *exthw) { /* stub */ } #endif /* NMIDI > 0 */ #if NMIDI > 0 || NMIDIBUS > 0 int audioprint(void *, const char *); struct device * midi_attach_mi(const struct midi_hw_if *mhwp, void *hdlp, struct device *dev) { struct audio_attach_args arg; #ifdef DIAGNOSTIC if (mhwp == NULL) { aprint_error("midi_attach_mi: NULL\n"); return (0); } #endif arg.type = AUDIODEV_TYPE_MIDI; arg.hwif = mhwp; arg.hdl = hdlp; return (config_found(dev, &arg, audioprint)); } #endif /* NMIDI > 0 || NMIDIBUS > 0 */