| 1 | /* $NetBSD: midi.c,v 1.85 2016/07/14 10:19:05 msaitoh Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1998, 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Lennart Augustsson (augustss@NetBSD.org), (MIDI FST and Active |
| 9 | * Sense handling) Chapman Flack (chap@NetBSD.org), and Andrew Doran. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 30 | * POSSIBILITY OF SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <sys/cdefs.h> |
| 34 | __KERNEL_RCSID(0, "$NetBSD: midi.c,v 1.85 2016/07/14 10:19:05 msaitoh Exp $" ); |
| 35 | |
| 36 | #include "midi.h" |
| 37 | #include "sequencer.h" |
| 38 | |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/ioctl.h> |
| 41 | #include <sys/fcntl.h> |
| 42 | #include <sys/vnode.h> |
| 43 | #include <sys/select.h> |
| 44 | #include <sys/poll.h> |
| 45 | #include <sys/proc.h> |
| 46 | #include <sys/systm.h> |
| 47 | #include <sys/callout.h> |
| 48 | #include <sys/syslog.h> |
| 49 | #include <sys/kernel.h> |
| 50 | #include <sys/signalvar.h> |
| 51 | #include <sys/conf.h> |
| 52 | #include <sys/audioio.h> |
| 53 | #include <sys/midiio.h> |
| 54 | #include <sys/device.h> |
| 55 | #include <sys/intr.h> |
| 56 | |
| 57 | #include <dev/audio_if.h> |
| 58 | #include <dev/midi_if.h> |
| 59 | #include <dev/midivar.h> |
| 60 | |
| 61 | #if NMIDI > 0 |
| 62 | |
| 63 | #ifdef AUDIO_DEBUG |
| 64 | #define DPRINTF(x) if (mididebug) printf x |
| 65 | #define DPRINTFN(n,x) if (mididebug >= (n)) printf x |
| 66 | int mididebug = 0; |
| 67 | /* |
| 68 | * 1: detected protocol errors and buffer overflows |
| 69 | * 2: probe, attach, detach |
| 70 | * 3: open, close |
| 71 | * 4: data received except realtime |
| 72 | * 5: ioctl |
| 73 | * 6: read, write, poll |
| 74 | * 7: data transmitted |
| 75 | * 8: uiomoves, synchronization |
| 76 | * 9: realtime data received |
| 77 | */ |
| 78 | #else |
| 79 | #define DPRINTF(x) |
| 80 | #define DPRINTFN(n,x) |
| 81 | #endif |
| 82 | |
| 83 | static struct midi_softc *hwif_softc = NULL; |
| 84 | static kmutex_t hwif_softc_lock; |
| 85 | |
| 86 | static void midi_in(void *, int); |
| 87 | static void midi_out(void *); |
| 88 | static int midi_poll_out(struct midi_softc *); |
| 89 | static int midi_intr_out(struct midi_softc *); |
| 90 | static int midi_msg_out(struct midi_softc *, u_char **, u_char **, |
| 91 | u_char **, u_char **); |
| 92 | static int midi_start_output(struct midi_softc *); |
| 93 | static void midi_initbuf(struct midi_buffer *); |
| 94 | static void midi_xmt_asense(void *); |
| 95 | static void midi_rcv_asense(void *); |
| 96 | static void midi_softint(void *); |
| 97 | |
| 98 | static int midiprobe(device_t, cfdata_t, void *); |
| 99 | static void midiattach(device_t, device_t, void *); |
| 100 | int mididetach(device_t, int); |
| 101 | static int midiactivate(device_t, enum devact); |
| 102 | |
| 103 | static dev_type_open(midiopen); |
| 104 | static dev_type_close(midiclose); |
| 105 | static dev_type_read(midiread); |
| 106 | static dev_type_write(midiwrite); |
| 107 | static dev_type_ioctl(midiioctl); |
| 108 | static dev_type_poll(midipoll); |
| 109 | static dev_type_kqfilter(midikqfilter); |
| 110 | |
| 111 | const struct cdevsw midi_cdevsw = { |
| 112 | .d_open = midiopen, |
| 113 | .d_close = midiclose, |
| 114 | .d_read = midiread, |
| 115 | .d_write = midiwrite, |
| 116 | .d_ioctl = midiioctl, |
| 117 | .d_stop = nostop, |
| 118 | .d_tty = notty, |
| 119 | .d_poll = midipoll, |
| 120 | .d_mmap = nommap, |
| 121 | .d_kqfilter = midikqfilter, |
| 122 | .d_discard = nodiscard, |
| 123 | .d_flag = D_OTHER | D_MPSAFE |
| 124 | }; |
| 125 | |
| 126 | CFATTACH_DECL_NEW(midi, sizeof(struct midi_softc), |
| 127 | midiprobe, midiattach, mididetach, midiactivate); |
| 128 | |
| 129 | #define MIDI_XMT_ASENSE_PERIOD mstohz(275) |
| 130 | #define MIDI_RCV_ASENSE_PERIOD mstohz(300) |
| 131 | |
| 132 | extern struct cfdriver midi_cd; |
| 133 | |
| 134 | static int |
| 135 | midiprobe(device_t parent, cfdata_t match, void *aux) |
| 136 | { |
| 137 | struct audio_attach_args *sa; |
| 138 | |
| 139 | sa = aux; |
| 140 | |
| 141 | DPRINTFN(2,("midiprobe: type=%d sa=%p hw=%p\n" , sa->type, sa, |
| 142 | sa->hwif)); |
| 143 | |
| 144 | return sa->type == AUDIODEV_TYPE_MIDI; |
| 145 | } |
| 146 | |
| 147 | static void |
| 148 | midiattach(device_t parent, device_t self, void *aux) |
| 149 | { |
| 150 | struct midi_softc *sc = device_private(self); |
| 151 | struct audio_attach_args *sa = aux; |
| 152 | const struct midi_hw_if *hwp; |
| 153 | void *hdlp; |
| 154 | |
| 155 | hwp = sa->hwif; |
| 156 | hdlp = sa->hdl; |
| 157 | |
| 158 | aprint_naive("\n" ); |
| 159 | |
| 160 | DPRINTFN(2, ("MIDI attach\n" )); |
| 161 | |
| 162 | #ifdef DIAGNOSTIC |
| 163 | if (hwp == 0 || |
| 164 | hwp->open == 0 || |
| 165 | hwp->close == 0 || |
| 166 | hwp->output == 0 || |
| 167 | hwp->getinfo == 0) { |
| 168 | aprint_error_dev(self, "missing method\n" ); |
| 169 | return; |
| 170 | } |
| 171 | #endif |
| 172 | |
| 173 | sc->dev = self; |
| 174 | sc->hw_if = hwp; |
| 175 | sc->hw_hdl = hdlp; |
| 176 | midi_attach(sc); |
| 177 | } |
| 178 | |
| 179 | static int |
| 180 | midiactivate(device_t self, enum devact act) |
| 181 | { |
| 182 | struct midi_softc *sc = device_private(self); |
| 183 | |
| 184 | switch (act) { |
| 185 | case DVACT_DEACTIVATE: |
| 186 | mutex_enter(sc->lock); |
| 187 | sc->dying = 1; |
| 188 | mutex_exit(sc->lock); |
| 189 | return 0; |
| 190 | default: |
| 191 | return EOPNOTSUPP; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | int |
| 196 | mididetach(device_t self, int flags) |
| 197 | { |
| 198 | struct midi_softc *sc = device_private(self); |
| 199 | int maj, mn; |
| 200 | |
| 201 | DPRINTFN(2,("%s: sc=%p flags=%d\n" , __func__, sc, flags)); |
| 202 | |
| 203 | pmf_device_deregister(self); |
| 204 | |
| 205 | mutex_enter(sc->lock); |
| 206 | sc->dying = 1; |
| 207 | |
| 208 | if (--sc->refcnt >= 0) { |
| 209 | /* Wake anything? */ |
| 210 | (void)cv_timedwait(&sc->detach_cv, sc->lock, hz * 60); |
| 211 | } |
| 212 | cv_broadcast(&sc->wchan); |
| 213 | cv_broadcast(&sc->rchan); |
| 214 | mutex_exit(sc->lock); |
| 215 | |
| 216 | /* locate the major number */ |
| 217 | maj = cdevsw_lookup_major(&midi_cdevsw); |
| 218 | |
| 219 | /* |
| 220 | * Nuke the vnodes for any open instances (calls close). |
| 221 | * Will wait until any activity on the device nodes has ceased. |
| 222 | * |
| 223 | * XXXAD NOT YET. |
| 224 | * |
| 225 | * XXXAD NEED TO PREVENT NEW REFERENCES THROUGH AUDIO_ENTER(). |
| 226 | */ |
| 227 | mn = device_unit(self); |
| 228 | vdevgone(maj, mn, mn, VCHR); |
| 229 | |
| 230 | if (!(sc->props & MIDI_PROP_NO_OUTPUT)) { |
| 231 | evcnt_detach(&sc->xmt.bytesDiscarded); |
| 232 | evcnt_detach(&sc->xmt.incompleteMessages); |
| 233 | } |
| 234 | if (sc->props & MIDI_PROP_CAN_INPUT) { |
| 235 | evcnt_detach(&sc->rcv.bytesDiscarded); |
| 236 | evcnt_detach(&sc->rcv.incompleteMessages); |
| 237 | } |
| 238 | |
| 239 | if (sc->sih != NULL) { |
| 240 | softint_disestablish(sc->sih); |
| 241 | sc->sih = NULL; |
| 242 | } |
| 243 | |
| 244 | mutex_enter(sc->lock); |
| 245 | callout_halt(&sc->xmt_asense_co, sc->lock); |
| 246 | callout_halt(&sc->rcv_asense_co, sc->lock); |
| 247 | mutex_exit(sc->lock); |
| 248 | |
| 249 | callout_destroy(&sc->xmt_asense_co); |
| 250 | callout_destroy(&sc->rcv_asense_co); |
| 251 | |
| 252 | cv_destroy(&sc->wchan); |
| 253 | cv_destroy(&sc->rchan); |
| 254 | cv_destroy(&sc->detach_cv); |
| 255 | |
| 256 | return (0); |
| 257 | } |
| 258 | |
| 259 | void |
| 260 | midi_attach(struct midi_softc *sc) |
| 261 | { |
| 262 | struct midi_info mi; |
| 263 | kmutex_t *dummy; |
| 264 | static int first = 1; |
| 265 | |
| 266 | if (first) { |
| 267 | mutex_init(&hwif_softc_lock, MUTEX_DEFAULT, IPL_NONE); |
| 268 | first = 0; |
| 269 | } |
| 270 | |
| 271 | sc->hw_if->get_locks(sc->hw_hdl, &sc->lock, &dummy); |
| 272 | |
| 273 | callout_init(&sc->xmt_asense_co, CALLOUT_MPSAFE); |
| 274 | callout_init(&sc->rcv_asense_co, CALLOUT_MPSAFE); |
| 275 | callout_setfunc(&sc->xmt_asense_co, midi_xmt_asense, sc); |
| 276 | callout_setfunc(&sc->rcv_asense_co, midi_rcv_asense, sc); |
| 277 | |
| 278 | sc->sih = softint_establish(SOFTINT_CLOCK | SOFTINT_MPSAFE, |
| 279 | midi_softint, sc); |
| 280 | |
| 281 | cv_init(&sc->rchan, "midird" ); |
| 282 | cv_init(&sc->wchan, "midiwr" ); |
| 283 | cv_init(&sc->detach_cv, "mididet" ); |
| 284 | |
| 285 | sc->dying = 0; |
| 286 | sc->isopen = 0; |
| 287 | sc->refcnt = 0; |
| 288 | |
| 289 | mutex_enter(&hwif_softc_lock); |
| 290 | mutex_enter(sc->lock); |
| 291 | hwif_softc = sc; |
| 292 | sc->hw_if->getinfo(sc->hw_hdl, &mi); |
| 293 | hwif_softc = NULL; |
| 294 | mutex_exit(sc->lock); |
| 295 | mutex_exit(&hwif_softc_lock); |
| 296 | |
| 297 | sc->props = mi.props; |
| 298 | |
| 299 | if (!(sc->props & MIDI_PROP_NO_OUTPUT)) { |
| 300 | evcnt_attach_dynamic(&sc->xmt.bytesDiscarded, |
| 301 | EVCNT_TYPE_MISC, NULL, |
| 302 | device_xname(sc->dev), "xmt bytes discarded" ); |
| 303 | evcnt_attach_dynamic(&sc->xmt.incompleteMessages, |
| 304 | EVCNT_TYPE_MISC, NULL, |
| 305 | device_xname(sc->dev), "xmt incomplete msgs" ); |
| 306 | } |
| 307 | if (sc->props & MIDI_PROP_CAN_INPUT) { |
| 308 | evcnt_attach_dynamic(&sc->rcv.bytesDiscarded, |
| 309 | EVCNT_TYPE_MISC, NULL, |
| 310 | device_xname(sc->dev), "rcv bytes discarded" ); |
| 311 | evcnt_attach_dynamic(&sc->rcv.incompleteMessages, |
| 312 | EVCNT_TYPE_MISC, NULL, |
| 313 | device_xname(sc->dev), "rcv incomplete msgs" ); |
| 314 | } |
| 315 | |
| 316 | aprint_naive("\n" ); |
| 317 | aprint_normal(": %s\n" , mi.name); |
| 318 | |
| 319 | if (!pmf_device_register(sc->dev, NULL, NULL)) |
| 320 | aprint_error_dev(sc->dev, "couldn't establish power handler\n" ); |
| 321 | } |
| 322 | |
| 323 | void |
| 324 | midi_register_hw_if_ext(struct midi_hw_if_ext *exthw) |
| 325 | { |
| 326 | if (hwif_softc != NULL) /* ignore calls resulting from non-init */ |
| 327 | hwif_softc->hw_if_ext = exthw; /* uses of getinfo */ |
| 328 | } |
| 329 | |
| 330 | int |
| 331 | midi_unit_count(void) |
| 332 | { |
| 333 | int i; |
| 334 | for ( i = 0; i < midi_cd.cd_ndevs; ++i) |
| 335 | if (NULL == device_lookup(&midi_cd, i)) |
| 336 | break; |
| 337 | return i; |
| 338 | } |
| 339 | |
| 340 | static void |
| 341 | midi_initbuf(struct midi_buffer *mb) |
| 342 | { |
| 343 | mb->idx_producerp = mb->idx_consumerp = mb->idx; |
| 344 | mb->buf_producerp = mb->buf_consumerp = mb->buf; |
| 345 | } |
| 346 | |
| 347 | #define PACK_MB_IDX(cat,len) (((cat)<<4)|(len)) |
| 348 | #define MB_IDX_CAT(idx) ((idx)>>4) |
| 349 | #define MB_IDX_LEN(idx) ((idx)&0xf) |
| 350 | |
| 351 | static char const midi_cats[] = "\0\0\0\0\0\0\0\0\2\2\2\2\1\1\2\3" ; |
| 352 | #define MIDI_CAT(d) (midi_cats[((d)>>4)&15]) |
| 353 | #define FST_RETURN(offp,endp,ret) \ |
| 354 | return (s->pos=s->msg+(offp)), (s->end=s->msg+(endp)), (ret) |
| 355 | |
| 356 | enum fst_ret { FST_CHN, FST_CHV, FST_COM, FST_SYX, FST_RT, FST_MORE, FST_ERR, |
| 357 | FST_HUH, FST_SXP }; |
| 358 | enum fst_form { FST_CANON, FST_COMPR, FST_VCOMP }; |
| 359 | static struct { |
| 360 | int off; |
| 361 | enum fst_ret tag; |
| 362 | } const midi_forms[] = { |
| 363 | [FST_CANON] = { .off=0, .tag=FST_CHN }, |
| 364 | [FST_COMPR] = { .off=1, .tag=FST_CHN }, |
| 365 | [FST_VCOMP] = { .off=0, .tag=FST_CHV } |
| 366 | }; |
| 367 | #define FST_CRETURN(endp) \ |
| 368 | FST_RETURN(midi_forms[form].off,endp,midi_forms[form].tag) |
| 369 | |
| 370 | /* |
| 371 | * A MIDI finite state transducer suitable for receiving or transmitting. It |
| 372 | * will accept correct MIDI input that uses, doesn't use, or sometimes uses the |
| 373 | * 'running status' compression technique, and transduce it to fully expanded |
| 374 | * (form=FST_CANON) or fully compressed (form=FST_COMPR or FST_VCOMP) form. |
| 375 | * |
| 376 | * Returns FST_MORE if a complete message has not been parsed yet (SysEx |
| 377 | * messages are the exception), FST_ERR or FST_HUH if the input does not |
| 378 | * conform to the protocol, or FST_CHN (channel messages), FST_COM (System |
| 379 | * Common messages), FST_RT (System Real-Time messages), or FST_SYX (System |
| 380 | * Exclusive) to broadly categorize the message parsed. s->pos and s->end |
| 381 | * locate the parsed message; while (s->pos<s->end) putchar(*(s->pos++)); |
| 382 | * would output it. |
| 383 | * |
| 384 | * FST_HUH means the character c wasn't valid in the original state, but the |
| 385 | * state has now been reset to START and the caller should try again passing |
| 386 | * the same c. FST_ERR means c isn't valid in the start state; the caller |
| 387 | * should kiss it goodbye and continue to try successive characters from the |
| 388 | * input until something other than FST_ERR or FST_HUH is returned, at which |
| 389 | * point things are resynchronized. |
| 390 | * |
| 391 | * A FST_SYX return means that between pos and end are from 1 to 3 |
| 392 | * bytes of a system exclusive message. A SysEx message will be delivered in |
| 393 | * one or more chunks of that form, where the first begins with 0xf0 and the |
| 394 | * last (which is the only one that might have length < 3) ends with 0xf7. |
| 395 | * |
| 396 | * Messages corrupted by a protocol error are discarded and won't be seen at |
| 397 | * all; again SysEx is the exception, as one or more chunks of it may already |
| 398 | * have been parsed. |
| 399 | * |
| 400 | * For FST_CHN messages, s->msg[0] always contains the status byte even if |
| 401 | * FST_COMPR form was requested (pos then points to msg[1]). That way, the |
| 402 | * caller can always identify the exact message if there is a need to do so. |
| 403 | * For all other message types except FST_SYX, the status byte is at *pos |
| 404 | * (which may not necessarily be msg[0]!). There is only one SysEx status |
| 405 | * byte, so the return value FST_SYX is sufficient to identify it. |
| 406 | * |
| 407 | * To simplify some use cases, compression can also be requested with |
| 408 | * form=FST_VCOMP. In this form a compressible channel message is indicated |
| 409 | * by returning a classification of FST_CHV instead of FST_CHN, and pos points |
| 410 | * to the status byte rather than being advanced past it. If the caller in this |
| 411 | * case saves the bytes from pos to end, it will have saved the entire message, |
| 412 | * and can act on the FST_CHV tag to drop the first byte later. In this form, |
| 413 | * unlike FST_CANON, hidden note-off (i.e. note-on with velocity 0) may occur. |
| 414 | * |
| 415 | * Two obscure points in the MIDI protocol complicate things further, both to |
| 416 | * do with the EndSysEx code, 0xf7. First, this code is permitted (and |
| 417 | * meaningless) outside of a System Exclusive message, anywhere a status byte |
| 418 | * could appear. Second, it is allowed to be absent at the end of a System |
| 419 | * Exclusive message (!) - any status byte at all (non-realtime) is allowed to |
| 420 | * terminate the message. Both require accomodation in the interface to |
| 421 | * midi_fst's caller. A stray 0xf7 should be ignored BUT should count as a |
| 422 | * message received for purposes of Active Sense timeout; the case is |
| 423 | * represented by a return of FST_COM with a length of zero (pos == end). A |
| 424 | * status byte other than 0xf7 during a system exclusive message will cause an |
| 425 | * FST_SXP (sysex plus) return; the bytes from pos to end are the end of the |
| 426 | * system exclusive message, and after handling those the caller should call |
| 427 | * midi_fst again with the same input byte. |
| 428 | * |
| 429 | * midi(4) will never produce either such form of rubbish. |
| 430 | */ |
| 431 | static enum fst_ret |
| 432 | midi_fst(struct midi_state *s, u_char c, enum fst_form form) |
| 433 | { |
| 434 | int syxpos = 0; |
| 435 | |
| 436 | if (c >= 0xf8) { /* All realtime messages bypass state machine */ |
| 437 | if (c == 0xf9 || c == 0xfd) { |
| 438 | DPRINTF( ("midi_fst: s=%p c=0x%02x undefined\n" , |
| 439 | s, c)); |
| 440 | s->bytesDiscarded.ev_count++; |
| 441 | return FST_ERR; |
| 442 | } |
| 443 | DPRINTFN(9, ("midi_fst: s=%p System Real-Time data=0x%02x\n" , |
| 444 | s, c)); |
| 445 | s->msg[2] = c; |
| 446 | FST_RETURN(2,3,FST_RT); |
| 447 | } |
| 448 | |
| 449 | DPRINTFN(4, ("midi_fst: s=%p data=0x%02x state=%d\n" , |
| 450 | s, c, s->state)); |
| 451 | |
| 452 | switch (s->state | MIDI_CAT(c)) { /* break ==> return FST_MORE */ |
| 453 | case MIDI_IN_START | MIDI_CAT_COMMON: |
| 454 | case MIDI_IN_RUN1_1 | MIDI_CAT_COMMON: |
| 455 | case MIDI_IN_RUN2_2 | MIDI_CAT_COMMON: |
| 456 | case MIDI_IN_RXX2_2 | MIDI_CAT_COMMON: |
| 457 | s->msg[0] = c; |
| 458 | switch ( c) { |
| 459 | case 0xf0: s->state = MIDI_IN_SYX1_3; break; |
| 460 | case 0xf1: s->state = MIDI_IN_COM0_1; break; |
| 461 | case 0xf2: s->state = MIDI_IN_COM0_2; break; |
| 462 | case 0xf3: s->state = MIDI_IN_COM0_1; break; |
| 463 | case 0xf6: s->state = MIDI_IN_START; FST_RETURN(0,1,FST_COM); |
| 464 | case 0xf7: s->state = MIDI_IN_START; FST_RETURN(0,0,FST_COM); |
| 465 | default: goto protocol_violation; |
| 466 | } |
| 467 | break; |
| 468 | |
| 469 | case MIDI_IN_RUN1_1 | MIDI_CAT_STATUS1: |
| 470 | if (c == s->msg[0]) { |
| 471 | s->state = MIDI_IN_RNX0_1; |
| 472 | break; |
| 473 | } |
| 474 | /* FALLTHROUGH */ |
| 475 | case MIDI_IN_RUN2_2 | MIDI_CAT_STATUS1: |
| 476 | case MIDI_IN_RXX2_2 | MIDI_CAT_STATUS1: |
| 477 | case MIDI_IN_START | MIDI_CAT_STATUS1: |
| 478 | s->state = MIDI_IN_RUN0_1; |
| 479 | s->msg[0] = c; |
| 480 | break; |
| 481 | |
| 482 | case MIDI_IN_RUN2_2 | MIDI_CAT_STATUS2: |
| 483 | case MIDI_IN_RXX2_2 | MIDI_CAT_STATUS2: |
| 484 | if (c == s->msg[0]) { |
| 485 | s->state = MIDI_IN_RNX0_2; |
| 486 | break; |
| 487 | } |
| 488 | if ((c ^ s->msg[0]) == 0x10 && (c & 0xe0) == 0x80) { |
| 489 | s->state = MIDI_IN_RXX0_2; |
| 490 | s->msg[0] = c; |
| 491 | break; |
| 492 | } |
| 493 | /* FALLTHROUGH */ |
| 494 | case MIDI_IN_RUN1_1 | MIDI_CAT_STATUS2: |
| 495 | case MIDI_IN_START | MIDI_CAT_STATUS2: |
| 496 | s->state = MIDI_IN_RUN0_2; |
| 497 | s->msg[0] = c; |
| 498 | break; |
| 499 | |
| 500 | case MIDI_IN_COM0_1 | MIDI_CAT_DATA: |
| 501 | s->state = MIDI_IN_START; |
| 502 | s->msg[1] = c; |
| 503 | FST_RETURN(0,2,FST_COM); |
| 504 | |
| 505 | case MIDI_IN_COM0_2 | MIDI_CAT_DATA: |
| 506 | s->state = MIDI_IN_COM1_2; |
| 507 | s->msg[1] = c; |
| 508 | break; |
| 509 | |
| 510 | case MIDI_IN_COM1_2 | MIDI_CAT_DATA: |
| 511 | s->state = MIDI_IN_START; |
| 512 | s->msg[2] = c; |
| 513 | FST_RETURN(0,3,FST_COM); |
| 514 | |
| 515 | case MIDI_IN_RUN0_1 | MIDI_CAT_DATA: |
| 516 | s->state = MIDI_IN_RUN1_1; |
| 517 | s->msg[1] = c; |
| 518 | FST_RETURN(0,2,FST_CHN); |
| 519 | |
| 520 | case MIDI_IN_RUN1_1 | MIDI_CAT_DATA: |
| 521 | case MIDI_IN_RNX0_1 | MIDI_CAT_DATA: |
| 522 | s->state = MIDI_IN_RUN1_1; |
| 523 | s->msg[1] = c; |
| 524 | FST_CRETURN(2); |
| 525 | |
| 526 | case MIDI_IN_RUN0_2 | MIDI_CAT_DATA: |
| 527 | s->state = MIDI_IN_RUN1_2; |
| 528 | s->msg[1] = c; |
| 529 | break; |
| 530 | |
| 531 | case MIDI_IN_RUN1_2 | MIDI_CAT_DATA: |
| 532 | if (FST_CANON == form && 0 == c && (s->msg[0]&0xf0) == 0x90) { |
| 533 | s->state = MIDI_IN_RXX2_2; |
| 534 | s->msg[0] ^= 0x10; |
| 535 | s->msg[2] = 64; |
| 536 | } else { |
| 537 | s->state = MIDI_IN_RUN2_2; |
| 538 | s->msg[2] = c; |
| 539 | } |
| 540 | FST_RETURN(0,3,FST_CHN); |
| 541 | |
| 542 | case MIDI_IN_RUN2_2 | MIDI_CAT_DATA: |
| 543 | s->state = MIDI_IN_RNX1_2; |
| 544 | s->msg[1] = c; |
| 545 | break; |
| 546 | |
| 547 | case MIDI_IN_RXX2_2 | MIDI_CAT_DATA: |
| 548 | s->state = MIDI_IN_RXX1_2; |
| 549 | s->msg[0] ^= 0x10; |
| 550 | s->msg[1] = c; |
| 551 | break; |
| 552 | |
| 553 | case MIDI_IN_RNX0_2 | MIDI_CAT_DATA: |
| 554 | s->state = MIDI_IN_RNY1_2; |
| 555 | s->msg[1] = c; |
| 556 | break; |
| 557 | |
| 558 | case MIDI_IN_RXX0_2 | MIDI_CAT_DATA: |
| 559 | s->state = MIDI_IN_RXY1_2; |
| 560 | s->msg[1] = c; |
| 561 | break; |
| 562 | |
| 563 | case MIDI_IN_RNX1_2 | MIDI_CAT_DATA: |
| 564 | case MIDI_IN_RNY1_2 | MIDI_CAT_DATA: |
| 565 | if (FST_CANON == form && 0 == c && (s->msg[0]&0xf0) == 0x90) { |
| 566 | s->state = MIDI_IN_RXX2_2; |
| 567 | s->msg[0] ^= 0x10; |
| 568 | s->msg[2] = 64; |
| 569 | FST_RETURN(0,3,FST_CHN); |
| 570 | } |
| 571 | s->state = MIDI_IN_RUN2_2; |
| 572 | s->msg[2] = c; |
| 573 | FST_CRETURN(3); |
| 574 | |
| 575 | case MIDI_IN_RXX1_2 | MIDI_CAT_DATA: |
| 576 | case MIDI_IN_RXY1_2 | MIDI_CAT_DATA: |
| 577 | if (( 0 == c && (s->msg[0]&0xf0) == 0x90) |
| 578 | || (64 == c && (s->msg[0]&0xf0) == 0x80 |
| 579 | && FST_CANON != form)) { |
| 580 | s->state = MIDI_IN_RXX2_2; |
| 581 | s->msg[0] ^= 0x10; |
| 582 | s->msg[2] = 64 - c; |
| 583 | FST_CRETURN(3); |
| 584 | } |
| 585 | s->state = MIDI_IN_RUN2_2; |
| 586 | s->msg[2] = c; |
| 587 | FST_RETURN(0,3,FST_CHN); |
| 588 | |
| 589 | case MIDI_IN_SYX1_3 | MIDI_CAT_DATA: |
| 590 | s->state = MIDI_IN_SYX2_3; |
| 591 | s->msg[1] = c; |
| 592 | break; |
| 593 | |
| 594 | case MIDI_IN_SYX2_3 | MIDI_CAT_DATA: |
| 595 | s->state = MIDI_IN_SYX0_3; |
| 596 | s->msg[2] = c; |
| 597 | FST_RETURN(0,3,FST_SYX); |
| 598 | |
| 599 | case MIDI_IN_SYX0_3 | MIDI_CAT_DATA: |
| 600 | s->state = MIDI_IN_SYX1_3; |
| 601 | s->msg[0] = c; |
| 602 | break; |
| 603 | |
| 604 | case MIDI_IN_SYX2_3 | MIDI_CAT_COMMON: |
| 605 | case MIDI_IN_SYX2_3 | MIDI_CAT_STATUS1: |
| 606 | case MIDI_IN_SYX2_3 | MIDI_CAT_STATUS2: |
| 607 | ++ syxpos; |
| 608 | /* FALLTHROUGH */ |
| 609 | case MIDI_IN_SYX1_3 | MIDI_CAT_COMMON: |
| 610 | case MIDI_IN_SYX1_3 | MIDI_CAT_STATUS1: |
| 611 | case MIDI_IN_SYX1_3 | MIDI_CAT_STATUS2: |
| 612 | ++ syxpos; |
| 613 | /* FALLTHROUGH */ |
| 614 | case MIDI_IN_SYX0_3 | MIDI_CAT_COMMON: |
| 615 | case MIDI_IN_SYX0_3 | MIDI_CAT_STATUS1: |
| 616 | case MIDI_IN_SYX0_3 | MIDI_CAT_STATUS2: |
| 617 | s->state = MIDI_IN_START; |
| 618 | if (c == 0xf7) { |
| 619 | s->msg[syxpos] = c; |
| 620 | FST_RETURN(0,1+syxpos,FST_SYX); |
| 621 | } |
| 622 | s->msg[syxpos] = 0xf7; |
| 623 | FST_RETURN(0,1+syxpos,FST_SXP); |
| 624 | |
| 625 | default: |
| 626 | protocol_violation: |
| 627 | DPRINTF(("midi_fst: unexpected %#02x in state %u\n" , |
| 628 | c, s->state)); |
| 629 | switch ( s->state) { |
| 630 | case MIDI_IN_RUN1_1: /* can only get here by seeing an */ |
| 631 | case MIDI_IN_RUN2_2: /* INVALID System Common message */ |
| 632 | case MIDI_IN_RXX2_2: |
| 633 | s->state = MIDI_IN_START; |
| 634 | /* FALLTHROUGH */ |
| 635 | case MIDI_IN_START: |
| 636 | s->bytesDiscarded.ev_count++; |
| 637 | return FST_ERR; |
| 638 | case MIDI_IN_COM1_2: |
| 639 | case MIDI_IN_RUN1_2: |
| 640 | case MIDI_IN_RNY1_2: |
| 641 | case MIDI_IN_RXY1_2: |
| 642 | s->bytesDiscarded.ev_count++; |
| 643 | /* FALLTHROUGH */ |
| 644 | case MIDI_IN_COM0_1: |
| 645 | case MIDI_IN_RUN0_1: |
| 646 | case MIDI_IN_RNX0_1: |
| 647 | case MIDI_IN_COM0_2: |
| 648 | case MIDI_IN_RUN0_2: |
| 649 | case MIDI_IN_RNX0_2: |
| 650 | case MIDI_IN_RXX0_2: |
| 651 | case MIDI_IN_RNX1_2: |
| 652 | case MIDI_IN_RXX1_2: |
| 653 | s->bytesDiscarded.ev_count++; |
| 654 | s->incompleteMessages.ev_count++; |
| 655 | break; |
| 656 | default: |
| 657 | DPRINTF(("midi_fst: mishandled %#02x(%u) in state %u?!\n" , |
| 658 | c, MIDI_CAT(c), s->state)); |
| 659 | break; |
| 660 | } |
| 661 | s->state = MIDI_IN_START; |
| 662 | return FST_HUH; |
| 663 | } |
| 664 | return FST_MORE; |
| 665 | } |
| 666 | |
| 667 | static void |
| 668 | midi_softint(void *cookie) |
| 669 | { |
| 670 | struct midi_softc *sc; |
| 671 | proc_t *p; |
| 672 | pid_t pid; |
| 673 | |
| 674 | sc = cookie; |
| 675 | |
| 676 | mutex_enter(proc_lock); |
| 677 | pid = sc->async; |
| 678 | if (pid != 0 && (p = proc_find(pid)) != NULL) |
| 679 | psignal(p, SIGIO); |
| 680 | mutex_exit(proc_lock); |
| 681 | } |
| 682 | |
| 683 | static void |
| 684 | midi_in(void *addr, int data) |
| 685 | { |
| 686 | struct midi_softc *sc; |
| 687 | struct midi_buffer *mb; |
| 688 | int i, count; |
| 689 | enum fst_ret got; |
| 690 | MIDI_BUF_DECLARE(idx); |
| 691 | MIDI_BUF_DECLARE(buf); |
| 692 | |
| 693 | sc = addr; |
| 694 | mb = &sc->inbuf; |
| 695 | |
| 696 | KASSERT(mutex_owned(sc->lock)); |
| 697 | |
| 698 | if (!sc->isopen) |
| 699 | return; |
| 700 | |
| 701 | if ((sc->flags & FREAD) == 0) |
| 702 | return; /* discard data if not reading */ |
| 703 | |
| 704 | sxp_again: |
| 705 | do { |
| 706 | got = midi_fst(&sc->rcv, data, FST_CANON); |
| 707 | } while (got == FST_HUH); |
| 708 | |
| 709 | switch (got) { |
| 710 | case FST_MORE: |
| 711 | case FST_ERR: |
| 712 | return; |
| 713 | case FST_CHN: |
| 714 | case FST_COM: |
| 715 | case FST_RT: |
| 716 | #if NSEQUENCER > 0 |
| 717 | if (sc->seqopen) { |
| 718 | extern void midiseq_in(struct midi_dev *,u_char *,int); |
| 719 | count = sc->rcv.end - sc->rcv.pos; |
| 720 | midiseq_in(sc->seq_md, sc->rcv.pos, count); |
| 721 | return; |
| 722 | } |
| 723 | #endif |
| 724 | /* |
| 725 | * Pass Active Sense to the sequencer if it's open, but not to |
| 726 | * a raw reader. (Really should do something intelligent with |
| 727 | * it then, though....) |
| 728 | */ |
| 729 | if (got == FST_RT && MIDI_ACK == sc->rcv.pos[0]) { |
| 730 | if (!sc->rcv_expect_asense) { |
| 731 | sc->rcv_expect_asense = 1; |
| 732 | callout_schedule(&sc->rcv_asense_co, |
| 733 | MIDI_RCV_ASENSE_PERIOD); |
| 734 | } |
| 735 | sc->rcv_quiescent = 0; |
| 736 | sc->rcv_eof = 0; |
| 737 | return; |
| 738 | } |
| 739 | /* FALLTHROUGH */ |
| 740 | /* |
| 741 | * Ultimately SysEx msgs should be offered to the sequencer also; the |
| 742 | * sequencer API addresses them - but maybe our sequencer can't handle |
| 743 | * them yet, so offer only to raw reader. (Which means, ultimately, |
| 744 | * discard them if the sequencer's open, as it's not doing reads!) |
| 745 | * -> When SysEx support is added to the sequencer, be sure to handle |
| 746 | * FST_SXP there too. |
| 747 | */ |
| 748 | case FST_SYX: |
| 749 | case FST_SXP: |
| 750 | count = sc->rcv.end - sc->rcv.pos; |
| 751 | sc->rcv_quiescent = 0; |
| 752 | sc->rcv_eof = 0; |
| 753 | if (0 == count) |
| 754 | break; |
| 755 | MIDI_BUF_PRODUCER_INIT(mb,idx); |
| 756 | MIDI_BUF_PRODUCER_INIT(mb,buf); |
| 757 | if (count > buf_lim - buf_cur |
| 758 | || 1 > idx_lim - idx_cur) { |
| 759 | sc->rcv.bytesDiscarded.ev_count += count; |
| 760 | DPRINTF(("midi_in: buffer full, discard data=0x%02x\n" , |
| 761 | sc->rcv.pos[0])); |
| 762 | return; |
| 763 | } |
| 764 | for (i = 0; i < count; i++) { |
| 765 | *buf_cur++ = sc->rcv.pos[i]; |
| 766 | MIDI_BUF_WRAP(buf); |
| 767 | } |
| 768 | *idx_cur++ = PACK_MB_IDX(got,count); |
| 769 | MIDI_BUF_WRAP(idx); |
| 770 | MIDI_BUF_PRODUCER_WBACK(mb,buf); |
| 771 | MIDI_BUF_PRODUCER_WBACK(mb,idx); |
| 772 | cv_broadcast(&sc->rchan); |
| 773 | selnotify(&sc->rsel, 0, NOTE_SUBMIT); |
| 774 | if (sc->async != 0) |
| 775 | softint_schedule(sc->sih); |
| 776 | break; |
| 777 | default: /* don't #ifdef this away, gcc will say FST_HUH not handled */ |
| 778 | printf("midi_in: midi_fst returned %d?!\n" , got); |
| 779 | } |
| 780 | if (FST_SXP == got) |
| 781 | goto sxp_again; |
| 782 | } |
| 783 | |
| 784 | static void |
| 785 | midi_out(void *addr) |
| 786 | { |
| 787 | struct midi_softc *sc = addr; |
| 788 | |
| 789 | KASSERT(mutex_owned(sc->lock)); |
| 790 | |
| 791 | if (!sc->isopen) |
| 792 | return; |
| 793 | DPRINTFN(8, ("midi_out: %p\n" , sc)); |
| 794 | midi_intr_out(sc); |
| 795 | } |
| 796 | |
| 797 | static int |
| 798 | midiopen(dev_t dev, int flags, int ifmt, struct lwp *l) |
| 799 | { |
| 800 | struct midi_softc *sc; |
| 801 | const struct midi_hw_if *hw; |
| 802 | int error; |
| 803 | |
| 804 | sc = device_lookup_private(&midi_cd, MIDIUNIT(dev)); |
| 805 | if (sc == NULL) |
| 806 | return (ENXIO); |
| 807 | DPRINTFN(3,("midiopen %p\n" , sc)); |
| 808 | |
| 809 | mutex_enter(sc->lock); |
| 810 | if (sc->dying) { |
| 811 | mutex_exit(sc->lock); |
| 812 | return (EIO); |
| 813 | } |
| 814 | hw = sc->hw_if; |
| 815 | if (hw == NULL) { |
| 816 | mutex_exit(sc->lock); |
| 817 | return ENXIO; |
| 818 | } |
| 819 | if (sc->isopen) { |
| 820 | mutex_exit(sc->lock); |
| 821 | return EBUSY; |
| 822 | } |
| 823 | |
| 824 | /* put both state machines into known states */ |
| 825 | sc->rcv.state = MIDI_IN_START; |
| 826 | sc->rcv.pos = sc->rcv.msg; |
| 827 | sc->rcv.end = sc->rcv.msg; |
| 828 | sc->xmt.state = MIDI_IN_START; |
| 829 | sc->xmt.pos = sc->xmt.msg; |
| 830 | sc->xmt.end = sc->xmt.msg; |
| 831 | |
| 832 | /* copy error counters so an ioctl (TBA) can give since-open stats */ |
| 833 | sc->rcv.atOpen.bytesDiscarded = sc->rcv.bytesDiscarded.ev_count; |
| 834 | sc->rcv.atQuery.bytesDiscarded = sc->rcv.bytesDiscarded.ev_count; |
| 835 | |
| 836 | sc->xmt.atOpen.bytesDiscarded = sc->xmt.bytesDiscarded.ev_count; |
| 837 | sc->xmt.atQuery.bytesDiscarded = sc->xmt.bytesDiscarded.ev_count; |
| 838 | |
| 839 | /* and the buffers */ |
| 840 | midi_initbuf(&sc->outbuf); |
| 841 | midi_initbuf(&sc->inbuf); |
| 842 | |
| 843 | /* and the receive flags */ |
| 844 | sc->rcv_expect_asense = 0; |
| 845 | sc->rcv_quiescent = 0; |
| 846 | sc->rcv_eof = 0; |
| 847 | sc->isopen++; |
| 848 | sc->flags = flags; |
| 849 | sc->pbus = 0; |
| 850 | sc->async = 0; |
| 851 | |
| 852 | #ifdef MIDI_SAVE |
| 853 | if (midicnt != 0) { |
| 854 | midisave.cnt = midicnt; |
| 855 | midicnt = 0; |
| 856 | } |
| 857 | #endif |
| 858 | |
| 859 | error = hw->open(sc->hw_hdl, flags, midi_in, midi_out, sc); |
| 860 | if (error) { |
| 861 | mutex_exit(sc->lock); |
| 862 | return error; |
| 863 | } |
| 864 | |
| 865 | mutex_exit(sc->lock); |
| 866 | return 0; |
| 867 | } |
| 868 | |
| 869 | static int |
| 870 | midiclose(dev_t dev, int flags, int ifmt, struct lwp *l) |
| 871 | { |
| 872 | struct midi_softc *sc; |
| 873 | const struct midi_hw_if *hw; |
| 874 | |
| 875 | sc = device_lookup_private(&midi_cd, MIDIUNIT(dev)); |
| 876 | hw = sc->hw_if; |
| 877 | |
| 878 | DPRINTFN(3,("midiclose %p\n" , sc)); |
| 879 | |
| 880 | mutex_enter(sc->lock); |
| 881 | /* midi_start_output(sc); anything buffered => pbus already set! */ |
| 882 | while (sc->pbus) { |
| 883 | if (sc->dying) |
| 884 | break; |
| 885 | DPRINTFN(8,("midiclose sleep ...\n" )); |
| 886 | cv_wait(&sc->wchan, sc->lock); |
| 887 | } |
| 888 | sc->isopen = 0; |
| 889 | callout_halt(&sc->xmt_asense_co, sc->lock); |
| 890 | callout_halt(&sc->rcv_asense_co, sc->lock); |
| 891 | hw->close(sc->hw_hdl); |
| 892 | sc->seqopen = 0; |
| 893 | sc->seq_md = 0; |
| 894 | mutex_exit(sc->lock); |
| 895 | |
| 896 | return 0; |
| 897 | } |
| 898 | |
| 899 | static int |
| 900 | midiread(dev_t dev, struct uio *uio, int ioflag) |
| 901 | { |
| 902 | struct midi_softc *sc; |
| 903 | struct midi_buffer *mb; |
| 904 | int appetite, error, first; |
| 905 | MIDI_BUF_DECLARE(idx); |
| 906 | MIDI_BUF_DECLARE(buf); |
| 907 | |
| 908 | sc = device_lookup_private(&midi_cd, MIDIUNIT(dev)); |
| 909 | mb = &sc->inbuf; |
| 910 | first = 1; |
| 911 | |
| 912 | DPRINTFN(6,("midiread: %p, count=%lu\n" , sc, |
| 913 | (unsigned long)uio->uio_resid)); |
| 914 | |
| 915 | mutex_enter(sc->lock); |
| 916 | if (sc->dying) { |
| 917 | mutex_exit(sc->lock); |
| 918 | return EIO; |
| 919 | } |
| 920 | if ((sc->props & MIDI_PROP_CAN_INPUT) == 0) { |
| 921 | mutex_exit(sc->lock); |
| 922 | return ENXIO; |
| 923 | } |
| 924 | MIDI_BUF_CONSUMER_INIT(mb,idx); |
| 925 | MIDI_BUF_CONSUMER_INIT(mb,buf); |
| 926 | error = 0; |
| 927 | for (;;) { |
| 928 | /* |
| 929 | * If the used portion of idx wraps around the end, just take |
| 930 | * the first part on this iteration, and we'll get the rest on |
| 931 | * the next. |
| 932 | */ |
| 933 | if (idx_lim > idx_end) |
| 934 | idx_lim = idx_end; |
| 935 | /* |
| 936 | * Count bytes through the last complete message that will |
| 937 | * fit in the requested read. |
| 938 | */ |
| 939 | for (appetite = uio->uio_resid; idx_cur < idx_lim; ++idx_cur) { |
| 940 | if (appetite < MB_IDX_LEN(*idx_cur)) |
| 941 | break; |
| 942 | appetite -= MB_IDX_LEN(*idx_cur); |
| 943 | } |
| 944 | appetite = uio->uio_resid - appetite; |
| 945 | |
| 946 | /* |
| 947 | * Only if the read is too small to hold even the first |
| 948 | * complete message will we return a partial one (updating idx |
| 949 | * to reflect the remaining length of the message). |
| 950 | */ |
| 951 | if (appetite == 0 && idx_cur < idx_lim) { |
| 952 | if (!first) |
| 953 | break; |
| 954 | appetite = uio->uio_resid; |
| 955 | *idx_cur = PACK_MB_IDX(MB_IDX_CAT(*idx_cur), |
| 956 | MB_IDX_LEN(*idx_cur) - appetite); |
| 957 | } |
| 958 | KASSERT(buf_cur + appetite <= buf_lim); |
| 959 | |
| 960 | /* move the bytes */ |
| 961 | if (appetite > 0) { |
| 962 | first = 0; /* we know we won't return empty-handed */ |
| 963 | /* do two uiomoves if data wrap around end of buf */ |
| 964 | if (buf_cur + appetite > buf_end) { |
| 965 | DPRINTFN(8, |
| 966 | ("midiread: uiomove cc=%td (prewrap)\n" , |
| 967 | buf_end - buf_cur)); |
| 968 | mutex_exit(sc->lock); |
| 969 | error = uiomove(buf_cur, buf_end - buf_cur, uio); |
| 970 | mutex_enter(sc->lock); |
| 971 | if (error) |
| 972 | break; |
| 973 | if (sc->dying) { |
| 974 | error = EIO; |
| 975 | break; |
| 976 | } |
| 977 | appetite -= buf_end - buf_cur; |
| 978 | buf_cur = mb->buf; |
| 979 | } |
| 980 | DPRINTFN(8, ("midiread: uiomove cc=%d\n" , appetite)); |
| 981 | mutex_exit(sc->lock); |
| 982 | error = uiomove(buf_cur, appetite, uio); |
| 983 | mutex_enter(sc->lock); |
| 984 | if (error) |
| 985 | break; |
| 986 | if (sc->dying) { |
| 987 | error = EIO; |
| 988 | break; |
| 989 | } |
| 990 | buf_cur += appetite; |
| 991 | } |
| 992 | |
| 993 | MIDI_BUF_WRAP(idx); |
| 994 | MIDI_BUF_WRAP(buf); |
| 995 | MIDI_BUF_CONSUMER_WBACK(mb,idx); |
| 996 | MIDI_BUF_CONSUMER_WBACK(mb,buf); |
| 997 | if (0 == uio->uio_resid) /* if read satisfied, we're done */ |
| 998 | break; |
| 999 | MIDI_BUF_CONSUMER_REFRESH(mb,idx); |
| 1000 | if (idx_cur == idx_lim) { /* need to wait for data? */ |
| 1001 | if (!first || sc->rcv_eof) /* never block reader if */ |
| 1002 | break; /* any data already in hand */ |
| 1003 | if (ioflag & IO_NDELAY) { |
| 1004 | error = EWOULDBLOCK; |
| 1005 | break; |
| 1006 | } |
| 1007 | error = cv_wait_sig(&sc->rchan, sc->lock); |
| 1008 | if (error) |
| 1009 | break; |
| 1010 | MIDI_BUF_CONSUMER_REFRESH(mb,idx); /* what'd we get? */ |
| 1011 | } |
| 1012 | MIDI_BUF_CONSUMER_REFRESH(mb,buf); |
| 1013 | if (sc->dying) { |
| 1014 | error = EIO; |
| 1015 | break; |
| 1016 | } |
| 1017 | } |
| 1018 | mutex_exit(sc->lock); |
| 1019 | |
| 1020 | return error; |
| 1021 | } |
| 1022 | |
| 1023 | static void |
| 1024 | midi_rcv_asense(void *arg) |
| 1025 | { |
| 1026 | struct midi_softc *sc; |
| 1027 | |
| 1028 | sc = arg; |
| 1029 | |
| 1030 | mutex_enter(sc->lock); |
| 1031 | if (sc->dying || !sc->isopen) { |
| 1032 | mutex_exit(sc->lock); |
| 1033 | return; |
| 1034 | } |
| 1035 | if (sc->rcv_quiescent) { |
| 1036 | sc->rcv_eof = 1; |
| 1037 | sc->rcv_quiescent = 0; |
| 1038 | sc->rcv_expect_asense = 0; |
| 1039 | cv_broadcast(&sc->rchan); |
| 1040 | selnotify(&sc->rsel, 0, NOTE_SUBMIT); |
| 1041 | if (sc->async) |
| 1042 | softint_schedule(sc->sih); |
| 1043 | mutex_exit(sc->lock); |
| 1044 | return; |
| 1045 | } |
| 1046 | sc->rcv_quiescent = 1; |
| 1047 | callout_schedule(&sc->rcv_asense_co, MIDI_RCV_ASENSE_PERIOD); |
| 1048 | mutex_exit(sc->lock); |
| 1049 | } |
| 1050 | |
| 1051 | static void |
| 1052 | midi_xmt_asense(void *arg) |
| 1053 | { |
| 1054 | struct midi_softc *sc; |
| 1055 | int error, armed; |
| 1056 | |
| 1057 | sc = arg; |
| 1058 | |
| 1059 | mutex_enter(sc->lock); |
| 1060 | if (sc->pbus || sc->dying || !sc->isopen) { |
| 1061 | mutex_exit(sc->lock); |
| 1062 | return; |
| 1063 | } |
| 1064 | sc->pbus = 1; |
| 1065 | if (sc->props & MIDI_PROP_OUT_INTR) { |
| 1066 | error = sc->hw_if->output(sc->hw_hdl, MIDI_ACK); |
| 1067 | armed = (error == 0); |
| 1068 | } else { |
| 1069 | error = sc->hw_if->output(sc->hw_hdl, MIDI_ACK); |
| 1070 | armed = 0; |
| 1071 | } |
| 1072 | if (!armed) { |
| 1073 | sc->pbus = 0; |
| 1074 | callout_schedule(&sc->xmt_asense_co, MIDI_XMT_ASENSE_PERIOD); |
| 1075 | } |
| 1076 | mutex_exit(sc->lock); |
| 1077 | } |
| 1078 | |
| 1079 | /* |
| 1080 | * The way this function was hacked up to plug into poll_out and intr_out |
| 1081 | * after they were written won't win it any beauty contests, but it'll work |
| 1082 | * (code in haste, refactor at leisure). |
| 1083 | */ |
| 1084 | static int |
| 1085 | midi_msg_out(struct midi_softc *sc, u_char **idx, u_char **idxl, u_char **buf, |
| 1086 | u_char **bufl) |
| 1087 | { |
| 1088 | MIDI_BUF_DECLARE(idx); |
| 1089 | MIDI_BUF_DECLARE(buf); |
| 1090 | MIDI_BUF_EXTENT_INIT(&sc->outbuf,idx); |
| 1091 | MIDI_BUF_EXTENT_INIT(&sc->outbuf,buf); |
| 1092 | int length; |
| 1093 | int error; |
| 1094 | u_char contig[3]; |
| 1095 | u_char *cp; |
| 1096 | u_char *ep; |
| 1097 | |
| 1098 | KASSERT(mutex_owned(sc->lock)); |
| 1099 | |
| 1100 | idx_cur = *idx; |
| 1101 | idx_lim = *idxl; |
| 1102 | buf_cur = *buf; |
| 1103 | buf_lim = *bufl; |
| 1104 | |
| 1105 | length = MB_IDX_LEN(*idx_cur); |
| 1106 | |
| 1107 | for ( cp = contig, ep = cp + length; cp < ep;) { |
| 1108 | *cp++ = *buf_cur++; |
| 1109 | MIDI_BUF_WRAP(buf); |
| 1110 | } |
| 1111 | cp = contig; |
| 1112 | |
| 1113 | switch ( MB_IDX_CAT(*idx_cur)) { |
| 1114 | case FST_CHV: /* chnmsg to be compressed (for device that wants it) */ |
| 1115 | ++ cp; |
| 1116 | -- length; |
| 1117 | /* FALLTHROUGH */ |
| 1118 | case FST_CHN: |
| 1119 | error = sc->hw_if_ext->channel(sc->hw_hdl, |
| 1120 | MIDI_GET_STATUS(contig[0]), MIDI_GET_CHAN(contig[0]), |
| 1121 | cp, length); |
| 1122 | break; |
| 1123 | case FST_COM: |
| 1124 | error = sc->hw_if_ext->common(sc->hw_hdl, |
| 1125 | MIDI_GET_STATUS(contig[0]), cp, length); |
| 1126 | break; |
| 1127 | case FST_SYX: |
| 1128 | case FST_SXP: |
| 1129 | error = sc->hw_if_ext->sysex(sc->hw_hdl, cp, length); |
| 1130 | break; |
| 1131 | case FST_RT: |
| 1132 | error = sc->hw_if->output(sc->hw_hdl, *cp); |
| 1133 | break; |
| 1134 | default: |
| 1135 | error = EIO; |
| 1136 | } |
| 1137 | |
| 1138 | if (!error) { |
| 1139 | ++ idx_cur; |
| 1140 | MIDI_BUF_WRAP(idx); |
| 1141 | *idx = idx_cur; |
| 1142 | *idxl = idx_lim; |
| 1143 | *buf = buf_cur; |
| 1144 | *bufl = buf_lim; |
| 1145 | } |
| 1146 | |
| 1147 | return error; |
| 1148 | } |
| 1149 | |
| 1150 | /* |
| 1151 | * midi_poll_out is intended for the midi hw (the vast majority of MIDI UARTs |
| 1152 | * on sound cards, apparently) that _do not have transmit-ready interrupts_. |
| 1153 | * Every call to hw_if->output for one of these may busy-wait to output the |
| 1154 | * byte; at the standard midi data rate that'll be 320us per byte. The |
| 1155 | * technique of writing only MIDI_MAX_WRITE bytes in a row and then waiting |
| 1156 | * for MIDI_WAIT does not reduce the total time spent busy-waiting, and it |
| 1157 | * adds arbitrary delays in transmission (and, since MIDI_WAIT is roughly the |
| 1158 | * same as the time to send MIDI_MAX_WRITE bytes, it effectively halves the |
| 1159 | * data rate). Here, a somewhat bolder approach is taken. Since midi traffic |
| 1160 | * is bursty but time-sensitive--most of the time there will be none at all, |
| 1161 | * but when there is it should go out ASAP--the strategy is to just get it |
| 1162 | * over with, and empty the buffer in one go. The effect this can have on |
| 1163 | * the rest of the system will be limited by the size of the buffer and the |
| 1164 | * sparseness of the traffic. But some precautions are in order. Interrupts |
| 1165 | * should all be unmasked when this is called, and midiwrite should not fill |
| 1166 | * the buffer more than once (when MIDI_PROP_CAN_INTR is false) without a |
| 1167 | * yield() so some other process can get scheduled. If the write is nonblocking, |
| 1168 | * midiwrite should return a short count rather than yield. |
| 1169 | * |
| 1170 | * Someday when there is fine-grained MP support, this should be reworked to |
| 1171 | * run in a callout so the writing process really could proceed concurrently. |
| 1172 | * But obviously where performance is a concern, interrupt-driven hardware |
| 1173 | * such as USB midi or (apparently) clcs will always be preferable. And it |
| 1174 | * seems (kern/32651) that many of the devices currently working in poll mode |
| 1175 | * may really have tx interrupt capability and want only implementation; that |
| 1176 | * ought to happen. |
| 1177 | */ |
| 1178 | static int |
| 1179 | midi_poll_out(struct midi_softc *sc) |
| 1180 | { |
| 1181 | struct midi_buffer *mb = &sc->outbuf; |
| 1182 | int error; |
| 1183 | int msglen; |
| 1184 | MIDI_BUF_DECLARE(idx); |
| 1185 | MIDI_BUF_DECLARE(buf); |
| 1186 | |
| 1187 | KASSERT(mutex_owned(sc->lock)); |
| 1188 | |
| 1189 | error = 0; |
| 1190 | MIDI_BUF_CONSUMER_INIT(mb,idx); |
| 1191 | MIDI_BUF_CONSUMER_INIT(mb,buf); |
| 1192 | |
| 1193 | for (;;) { |
| 1194 | while (idx_cur != idx_lim) { |
| 1195 | if (sc->hw_if_ext) { |
| 1196 | error = midi_msg_out(sc, &idx_cur, &idx_lim, |
| 1197 | &buf_cur, &buf_lim); |
| 1198 | if (error != 0) { |
| 1199 | break; |
| 1200 | } |
| 1201 | continue; |
| 1202 | } |
| 1203 | /* or, lacking hw_if_ext ... */ |
| 1204 | msglen = MB_IDX_LEN(*idx_cur); |
| 1205 | DPRINTFN(7,("midi_poll_out: %p <- %#02x\n" , |
| 1206 | sc->hw_hdl, *buf_cur)); |
| 1207 | error = sc->hw_if->output(sc->hw_hdl, *buf_cur); |
| 1208 | if (error) { |
| 1209 | break; |
| 1210 | } |
| 1211 | buf_cur++; |
| 1212 | MIDI_BUF_WRAP(buf); |
| 1213 | msglen--; |
| 1214 | if (msglen) { |
| 1215 | *idx_cur = PACK_MB_IDX(MB_IDX_CAT(*idx_cur), |
| 1216 | msglen); |
| 1217 | } else { |
| 1218 | idx_cur++; |
| 1219 | MIDI_BUF_WRAP(idx); |
| 1220 | } |
| 1221 | } |
| 1222 | if (error != 0) { |
| 1223 | break; |
| 1224 | } |
| 1225 | KASSERT(buf_cur == buf_lim); |
| 1226 | MIDI_BUF_CONSUMER_WBACK(mb,idx); |
| 1227 | MIDI_BUF_CONSUMER_WBACK(mb,buf); |
| 1228 | MIDI_BUF_CONSUMER_REFRESH(mb,idx); /* any more to transmit? */ |
| 1229 | MIDI_BUF_CONSUMER_REFRESH(mb,buf); |
| 1230 | if (idx_lim == idx_cur) |
| 1231 | break; |
| 1232 | } |
| 1233 | |
| 1234 | if (error != 0) { |
| 1235 | DPRINTF(("midi_poll_output error %d\n" , error)); |
| 1236 | MIDI_BUF_CONSUMER_WBACK(mb,idx); |
| 1237 | MIDI_BUF_CONSUMER_WBACK(mb,buf); |
| 1238 | } |
| 1239 | sc->pbus = 0; |
| 1240 | callout_schedule(&sc->xmt_asense_co, MIDI_XMT_ASENSE_PERIOD); |
| 1241 | return error; |
| 1242 | } |
| 1243 | |
| 1244 | /* |
| 1245 | * The interrupt flavor acquires spl and lock once and releases at the end, |
| 1246 | * as it expects to write only one byte or message. The interface convention |
| 1247 | * is that if hw_if->output returns 0, it has initiated transmission and the |
| 1248 | * completion interrupt WILL be forthcoming; if it has not returned 0, NO |
| 1249 | * interrupt will be forthcoming, and if it returns EINPROGRESS it wants |
| 1250 | * another byte right away. |
| 1251 | */ |
| 1252 | static int |
| 1253 | midi_intr_out(struct midi_softc *sc) |
| 1254 | { |
| 1255 | struct midi_buffer *mb; |
| 1256 | int error, msglen; |
| 1257 | MIDI_BUF_DECLARE(idx); |
| 1258 | MIDI_BUF_DECLARE(buf); |
| 1259 | int armed = 0; |
| 1260 | |
| 1261 | KASSERT(mutex_owned(sc->lock)); |
| 1262 | |
| 1263 | error = 0; |
| 1264 | mb = &sc->outbuf; |
| 1265 | |
| 1266 | MIDI_BUF_CONSUMER_INIT(mb,idx); |
| 1267 | MIDI_BUF_CONSUMER_INIT(mb,buf); |
| 1268 | |
| 1269 | while (idx_cur != idx_lim) { |
| 1270 | if (sc->hw_if_ext) { |
| 1271 | error = midi_msg_out(sc, &idx_cur, &idx_lim, |
| 1272 | &buf_cur, &buf_lim); |
| 1273 | if (!error ) /* no EINPROGRESS from extended hw_if */ |
| 1274 | armed = 1; |
| 1275 | break; |
| 1276 | } |
| 1277 | /* or, lacking hw_if_ext ... */ |
| 1278 | msglen = MB_IDX_LEN(*idx_cur); |
| 1279 | error = sc->hw_if->output(sc->hw_hdl, *buf_cur); |
| 1280 | if (error && error != EINPROGRESS) |
| 1281 | break; |
| 1282 | ++buf_cur; |
| 1283 | MIDI_BUF_WRAP(buf); |
| 1284 | --msglen; |
| 1285 | if (msglen) |
| 1286 | *idx_cur = PACK_MB_IDX(MB_IDX_CAT(*idx_cur),msglen); |
| 1287 | else { |
| 1288 | ++idx_cur; |
| 1289 | MIDI_BUF_WRAP(idx); |
| 1290 | } |
| 1291 | if (!error) { |
| 1292 | armed = 1; |
| 1293 | break; |
| 1294 | } |
| 1295 | } |
| 1296 | MIDI_BUF_CONSUMER_WBACK(mb,idx); |
| 1297 | MIDI_BUF_CONSUMER_WBACK(mb,buf); |
| 1298 | if (!armed) { |
| 1299 | sc->pbus = 0; |
| 1300 | callout_schedule(&sc->xmt_asense_co, MIDI_XMT_ASENSE_PERIOD); |
| 1301 | } |
| 1302 | cv_broadcast(&sc->wchan); |
| 1303 | selnotify(&sc->wsel, 0, NOTE_SUBMIT); |
| 1304 | if (sc->async) { |
| 1305 | softint_schedule(sc->sih); |
| 1306 | } |
| 1307 | if (error) { |
| 1308 | DPRINTF(("midi_intr_output error %d\n" , error)); |
| 1309 | } |
| 1310 | return error; |
| 1311 | } |
| 1312 | |
| 1313 | static int |
| 1314 | midi_start_output(struct midi_softc *sc) |
| 1315 | { |
| 1316 | |
| 1317 | KASSERT(mutex_owned(sc->lock)); |
| 1318 | |
| 1319 | if (sc->dying) |
| 1320 | return EIO; |
| 1321 | if (sc->props & MIDI_PROP_OUT_INTR) |
| 1322 | return midi_intr_out(sc); |
| 1323 | return midi_poll_out(sc); |
| 1324 | } |
| 1325 | |
| 1326 | static int |
| 1327 | real_writebytes(struct midi_softc *sc, u_char *ibuf, int cc) |
| 1328 | { |
| 1329 | u_char *iend; |
| 1330 | struct midi_buffer *mb; |
| 1331 | int arming, count, got; |
| 1332 | enum fst_form form; |
| 1333 | MIDI_BUF_DECLARE(idx); |
| 1334 | MIDI_BUF_DECLARE(buf); |
| 1335 | int error; |
| 1336 | |
| 1337 | KASSERT(mutex_owned(sc->lock)); |
| 1338 | |
| 1339 | if (sc->dying || !sc->isopen) |
| 1340 | return EIO; |
| 1341 | |
| 1342 | sc->refcnt++; |
| 1343 | |
| 1344 | iend = ibuf + cc; |
| 1345 | mb = &sc->outbuf; |
| 1346 | arming = 0; |
| 1347 | |
| 1348 | /* |
| 1349 | * If the hardware uses the extended hw_if, pass it canonicalized |
| 1350 | * messages (or compressed ones if it specifically requests, using |
| 1351 | * VCOMP form so the bottom half can still pass the op and chan along); |
| 1352 | * if it does not, send it compressed messages (using COMPR form as |
| 1353 | * there is no need to preserve the status for the bottom half). |
| 1354 | */ |
| 1355 | if (NULL == sc->hw_if_ext) |
| 1356 | form = FST_COMPR; |
| 1357 | else if (sc->hw_if_ext->compress) |
| 1358 | form = FST_VCOMP; |
| 1359 | else |
| 1360 | form = FST_CANON; |
| 1361 | |
| 1362 | MIDI_BUF_PRODUCER_INIT(mb,idx); |
| 1363 | MIDI_BUF_PRODUCER_INIT(mb,buf); |
| 1364 | |
| 1365 | while (ibuf < iend) { |
| 1366 | got = midi_fst(&sc->xmt, *ibuf, form); |
| 1367 | ++ibuf; |
| 1368 | switch ( got) { |
| 1369 | case FST_MORE: |
| 1370 | continue; |
| 1371 | case FST_ERR: |
| 1372 | case FST_HUH: |
| 1373 | error = EPROTO; |
| 1374 | goto out; |
| 1375 | case FST_CHN: |
| 1376 | case FST_CHV: /* only occurs in VCOMP form */ |
| 1377 | case FST_COM: |
| 1378 | case FST_RT: |
| 1379 | case FST_SYX: |
| 1380 | case FST_SXP: |
| 1381 | break; /* go add to buffer */ |
| 1382 | #if defined(AUDIO_DEBUG) || defined(DIAGNOSTIC) |
| 1383 | default: |
| 1384 | printf("midi_wr: midi_fst returned %d?!\n" , got); |
| 1385 | #endif |
| 1386 | } |
| 1387 | count = sc->xmt.end - sc->xmt.pos; |
| 1388 | if (0 == count ) /* can happen with stray 0xf7; see midi_fst */ |
| 1389 | continue; |
| 1390 | /* |
| 1391 | * return EWOULDBLOCK if the data passed will not fit in |
| 1392 | * the buffer; the caller should have taken steps to avoid that. |
| 1393 | * If got==FST_SXP we lose the new status byte, but we're losing |
| 1394 | * anyway, so c'est la vie. |
| 1395 | */ |
| 1396 | if (idx_cur == idx_lim || count > buf_lim - buf_cur) { |
| 1397 | MIDI_BUF_PRODUCER_REFRESH(mb,idx); /* get the most */ |
| 1398 | MIDI_BUF_PRODUCER_REFRESH(mb,buf); /* current facts */ |
| 1399 | if (idx_cur == idx_lim || count > buf_lim - buf_cur) { |
| 1400 | error = EWOULDBLOCK; /* caller's problem */ |
| 1401 | goto out; |
| 1402 | } |
| 1403 | } |
| 1404 | *idx_cur++ = PACK_MB_IDX(got,count); |
| 1405 | MIDI_BUF_WRAP(idx); |
| 1406 | while (count) { |
| 1407 | *buf_cur++ = *(sc->xmt.pos)++; |
| 1408 | MIDI_BUF_WRAP(buf); |
| 1409 | -- count; |
| 1410 | } |
| 1411 | if (FST_SXP == got) |
| 1412 | -- ibuf; /* again with same status byte */ |
| 1413 | } |
| 1414 | MIDI_BUF_PRODUCER_WBACK(mb,buf); |
| 1415 | MIDI_BUF_PRODUCER_WBACK(mb,idx); |
| 1416 | /* |
| 1417 | * If the output transfer is not already busy, and there is a message |
| 1418 | * buffered, mark it busy, stop the Active Sense callout (what if we're |
| 1419 | * too late and it's expired already? No big deal, an extra Active Sense |
| 1420 | * never hurt anybody) and start the output transfer once we're out of |
| 1421 | * the critical section (pbus==1 will stop anyone else doing the same). |
| 1422 | */ |
| 1423 | MIDI_BUF_CONSUMER_INIT(mb,idx); /* check what consumer's got to read */ |
| 1424 | if (!sc->pbus && idx_cur < idx_lim) { |
| 1425 | sc->pbus = 1; |
| 1426 | callout_stop(&sc->xmt_asense_co); |
| 1427 | arming = 1; |
| 1428 | } |
| 1429 | |
| 1430 | error = arming ? midi_start_output(sc) : 0; |
| 1431 | |
| 1432 | out: |
| 1433 | if (--sc->refcnt < 0) |
| 1434 | cv_broadcast(&sc->detach_cv); |
| 1435 | |
| 1436 | return error; |
| 1437 | } |
| 1438 | |
| 1439 | static int |
| 1440 | midiwrite(dev_t dev, struct uio *uio, int ioflag) |
| 1441 | { |
| 1442 | struct midi_softc *sc; |
| 1443 | struct midi_buffer *mb; |
| 1444 | int error; |
| 1445 | u_char inp[256]; |
| 1446 | MIDI_BUF_DECLARE(idx); |
| 1447 | MIDI_BUF_DECLARE(buf); |
| 1448 | size_t idxspace; |
| 1449 | size_t bufspace; |
| 1450 | size_t xfrcount; |
| 1451 | int pollout = 0; |
| 1452 | |
| 1453 | (void)buf_end; (void)idx_end; |
| 1454 | sc = device_lookup_private(&midi_cd, MIDIUNIT(dev)); |
| 1455 | |
| 1456 | DPRINTFN(6,("midiwrite: %p, unit=%d, count=%lu\n" , sc, (int)minor(dev), |
| 1457 | (unsigned long)uio->uio_resid)); |
| 1458 | |
| 1459 | mutex_enter(sc->lock); |
| 1460 | if (sc->dying) { |
| 1461 | mutex_exit(sc->lock); |
| 1462 | return EIO; |
| 1463 | } |
| 1464 | |
| 1465 | sc->refcnt++; |
| 1466 | |
| 1467 | mb = &sc->outbuf; |
| 1468 | error = 0; |
| 1469 | while (uio->uio_resid > 0 && !error) { |
| 1470 | /* |
| 1471 | * block if necessary for the minimum buffer space to guarantee |
| 1472 | * we can write something. |
| 1473 | */ |
| 1474 | MIDI_BUF_PRODUCER_INIT(mb,idx); /* init can't go above loop; */ |
| 1475 | MIDI_BUF_PRODUCER_INIT(mb,buf); /* real_writebytes moves cur */ |
| 1476 | for (;;) { |
| 1477 | idxspace = MIDI_BUF_PRODUCER_REFRESH(mb,idx) - idx_cur; |
| 1478 | bufspace = MIDI_BUF_PRODUCER_REFRESH(mb,buf) - buf_cur; |
| 1479 | if (idxspace >= 1 && bufspace >= 3 && !pollout) |
| 1480 | break; |
| 1481 | DPRINTFN(8,("midi_write: sleep idx=%zd buf=%zd\n" , |
| 1482 | idxspace, bufspace)); |
| 1483 | if (ioflag & IO_NDELAY) { |
| 1484 | /* |
| 1485 | * If some amount has already been transferred, |
| 1486 | * the common syscall code will automagically |
| 1487 | * convert this to success with a short count. |
| 1488 | */ |
| 1489 | error = EWOULDBLOCK; |
| 1490 | goto out; |
| 1491 | } |
| 1492 | if (pollout) { |
| 1493 | mutex_exit(sc->lock); |
| 1494 | yield(); /* see midi_poll_output */ |
| 1495 | mutex_enter(sc->lock); |
| 1496 | pollout = 0; |
| 1497 | } else |
| 1498 | error = cv_wait_sig(&sc->wchan, sc->lock); |
| 1499 | if (sc->dying) |
| 1500 | error = EIO; |
| 1501 | if (error) { |
| 1502 | /* |
| 1503 | * Similarly, the common code will handle |
| 1504 | * EINTR and ERESTART properly here, changing to |
| 1505 | * a short count if something transferred. |
| 1506 | */ |
| 1507 | goto out; |
| 1508 | } |
| 1509 | } |
| 1510 | |
| 1511 | /* |
| 1512 | * The number of bytes we can safely extract from the uio |
| 1513 | * depends on the available idx and buf space. Worst case, |
| 1514 | * every byte is a message so 1 idx is required per byte. |
| 1515 | * Worst case, the first byte completes a 3-byte msg in prior |
| 1516 | * state, and every subsequent byte is a Program Change or |
| 1517 | * Channel Pressure msg with running status and expands to 2 |
| 1518 | * bytes, so the buf space reqd is 3+2(n-1) or 2n+1. So limit |
| 1519 | * the transfer to the min of idxspace and (bufspace-1)>>1. |
| 1520 | */ |
| 1521 | xfrcount = (bufspace - 1) >> 1; |
| 1522 | if (xfrcount > idxspace) |
| 1523 | xfrcount = idxspace; |
| 1524 | if (xfrcount > sizeof inp) |
| 1525 | xfrcount = sizeof inp; |
| 1526 | if (xfrcount > uio->uio_resid) |
| 1527 | xfrcount = uio->uio_resid; |
| 1528 | |
| 1529 | mutex_exit(sc->lock); |
| 1530 | error = uiomove(inp, xfrcount, uio); |
| 1531 | mutex_enter(sc->lock); |
| 1532 | #ifdef MIDI_DEBUG |
| 1533 | if (error) |
| 1534 | printf("midi_write:(1) uiomove failed %d; " |
| 1535 | "xfrcount=%zu inp=%p\n" , |
| 1536 | error, xfrcount, inp); |
| 1537 | #endif |
| 1538 | if (error) |
| 1539 | break; |
| 1540 | |
| 1541 | /* |
| 1542 | * The number of bytes we extracted being calculated to |
| 1543 | * definitely fit in the buffer even with canonicalization, |
| 1544 | * there is no excuse for real_writebytes to return EWOULDBLOCK. |
| 1545 | */ |
| 1546 | error = real_writebytes(sc, inp, xfrcount); |
| 1547 | KASSERT(error != EWOULDBLOCK); |
| 1548 | if (error) |
| 1549 | break; |
| 1550 | |
| 1551 | /* |
| 1552 | * If this is a polling device and we just sent a buffer, let's |
| 1553 | * not send another without giving some other process a chance. |
| 1554 | */ |
| 1555 | if ((sc->props & MIDI_PROP_OUT_INTR) == 0) |
| 1556 | pollout = 1; |
| 1557 | DPRINTFN(8,("midiwrite: uio_resid now %zu, props=%d\n" , |
| 1558 | uio->uio_resid, sc->props)); |
| 1559 | } |
| 1560 | |
| 1561 | out: |
| 1562 | if (--sc->refcnt < 0) |
| 1563 | cv_broadcast(&sc->detach_cv); |
| 1564 | |
| 1565 | mutex_exit(sc->lock); |
| 1566 | return error; |
| 1567 | } |
| 1568 | |
| 1569 | /* |
| 1570 | * This write routine is only called from sequencer code and expects |
| 1571 | * a write that is smaller than the MIDI buffer. |
| 1572 | */ |
| 1573 | int |
| 1574 | midi_writebytes(int unit, u_char *bf, int cc) |
| 1575 | { |
| 1576 | struct midi_softc *sc = |
| 1577 | device_lookup_private(&midi_cd, unit); |
| 1578 | int error; |
| 1579 | |
| 1580 | if (!sc) |
| 1581 | return EIO; |
| 1582 | |
| 1583 | DPRINTFN(7, ("midi_writebytes: %p, unit=%d, cc=%d %#02x %#02x %#02x\n" , |
| 1584 | sc, unit, cc, bf[0], bf[1], bf[2])); |
| 1585 | |
| 1586 | mutex_enter(sc->lock); |
| 1587 | if (sc->dying) |
| 1588 | error = EIO; |
| 1589 | else |
| 1590 | error = real_writebytes(sc, bf, cc); |
| 1591 | mutex_exit(sc->lock); |
| 1592 | |
| 1593 | return error; |
| 1594 | } |
| 1595 | |
| 1596 | static int |
| 1597 | midiioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) |
| 1598 | { |
| 1599 | struct midi_softc *sc; |
| 1600 | const struct midi_hw_if *hw; |
| 1601 | int error; |
| 1602 | MIDI_BUF_DECLARE(buf); |
| 1603 | |
| 1604 | (void)buf_end; |
| 1605 | sc = device_lookup_private(&midi_cd, MIDIUNIT(dev)); |
| 1606 | |
| 1607 | mutex_enter(sc->lock); |
| 1608 | if (sc->dying) { |
| 1609 | mutex_exit(sc->lock); |
| 1610 | return EIO; |
| 1611 | } |
| 1612 | hw = sc->hw_if; |
| 1613 | error = 0; |
| 1614 | |
| 1615 | sc->refcnt++; |
| 1616 | |
| 1617 | DPRINTFN(5,("midiioctl: %p cmd=0x%08lx\n" , sc, cmd)); |
| 1618 | |
| 1619 | switch (cmd) { |
| 1620 | case FIONBIO: |
| 1621 | /* All handled in the upper layer. */ |
| 1622 | break; |
| 1623 | |
| 1624 | case FIONREAD: |
| 1625 | /* |
| 1626 | * This code relies on the current implementation of midi_in |
| 1627 | * always updating buf and idx together in a critical section, |
| 1628 | * so buf always ends at a message boundary. Document this |
| 1629 | * ioctl as always returning a value such that the last message |
| 1630 | * included is complete (SysEx the only exception), and then |
| 1631 | * make sure the implementation doesn't regress. NB that |
| 1632 | * means if this ioctl returns n and the proc then issues a |
| 1633 | * read of n, n bytes will be read, but if the proc issues a |
| 1634 | * read of m < n, fewer than m bytes may be read to ensure the |
| 1635 | * read ends at a message boundary. |
| 1636 | */ |
| 1637 | MIDI_BUF_CONSUMER_INIT(&sc->inbuf,buf); |
| 1638 | *(int *)addr = buf_lim - buf_cur; |
| 1639 | break; |
| 1640 | |
| 1641 | case FIOASYNC: |
| 1642 | mutex_exit(sc->lock); |
| 1643 | mutex_enter(proc_lock); |
| 1644 | if (*(int *)addr) { |
| 1645 | if (sc->async) { |
| 1646 | error = EBUSY; |
| 1647 | } else { |
| 1648 | sc->async = curproc->p_pid; |
| 1649 | } |
| 1650 | DPRINTFN(5,("midi_ioctl: FIOASYNC %d\n" , |
| 1651 | curproc->p_pid)); |
| 1652 | } else { |
| 1653 | sc->async = 0; |
| 1654 | } |
| 1655 | mutex_exit(proc_lock); |
| 1656 | mutex_enter(sc->lock); |
| 1657 | break; |
| 1658 | |
| 1659 | #if 0 |
| 1660 | case MIDI_PRETIME: |
| 1661 | /* XXX OSS |
| 1662 | * This should set up a read timeout, but that's |
| 1663 | * why we have poll(), so there's nothing yet. */ |
| 1664 | error = EINVAL; |
| 1665 | break; |
| 1666 | #endif |
| 1667 | |
| 1668 | #ifdef MIDI_SAVE |
| 1669 | case MIDI_GETSAVE: |
| 1670 | mutex_exit(sc->lock); |
| 1671 | error = copyout(&midisave, *(void **)addr, sizeof midisave); |
| 1672 | mutex_enter(sc->lock); |
| 1673 | break; |
| 1674 | #endif |
| 1675 | |
| 1676 | default: |
| 1677 | if (hw->ioctl != NULL) { |
| 1678 | error = hw->ioctl(sc->hw_hdl, cmd, addr, flag, l); |
| 1679 | } else { |
| 1680 | error = EINVAL; |
| 1681 | } |
| 1682 | break; |
| 1683 | } |
| 1684 | |
| 1685 | if (--sc->refcnt < 0) |
| 1686 | cv_broadcast(&sc->detach_cv); |
| 1687 | mutex_exit(sc->lock); |
| 1688 | return error; |
| 1689 | } |
| 1690 | |
| 1691 | static int |
| 1692 | midipoll(dev_t dev, int events, struct lwp *l) |
| 1693 | { |
| 1694 | struct midi_softc *sc; |
| 1695 | int revents; |
| 1696 | MIDI_BUF_DECLARE(idx); |
| 1697 | MIDI_BUF_DECLARE(buf); |
| 1698 | |
| 1699 | (void)buf_end; (void)idx_end; |
| 1700 | sc = device_lookup_private(&midi_cd, MIDIUNIT(dev)); |
| 1701 | revents = 0; |
| 1702 | |
| 1703 | DPRINTFN(6,("midipoll: %p events=0x%x\n" , sc, events)); |
| 1704 | |
| 1705 | mutex_enter(sc->lock); |
| 1706 | if (sc->dying) { |
| 1707 | mutex_exit(sc->lock); |
| 1708 | return POLLHUP; |
| 1709 | } |
| 1710 | |
| 1711 | sc->refcnt++; |
| 1712 | |
| 1713 | if ((events & (POLLIN | POLLRDNORM)) != 0) { |
| 1714 | MIDI_BUF_CONSUMER_INIT(&sc->inbuf, idx); |
| 1715 | if (idx_cur < idx_lim) |
| 1716 | revents |= events & (POLLIN | POLLRDNORM); |
| 1717 | else |
| 1718 | selrecord(l, &sc->rsel); |
| 1719 | } |
| 1720 | if ((events & (POLLOUT | POLLWRNORM)) != 0) { |
| 1721 | MIDI_BUF_PRODUCER_INIT(&sc->outbuf, idx); |
| 1722 | MIDI_BUF_PRODUCER_INIT(&sc->outbuf, buf); |
| 1723 | if (idx_lim - idx_cur >= 1 && buf_lim - buf_cur >= 3) |
| 1724 | revents |= events & (POLLOUT | POLLWRNORM); |
| 1725 | else |
| 1726 | selrecord(l, &sc->wsel); |
| 1727 | } |
| 1728 | |
| 1729 | if (--sc->refcnt < 0) |
| 1730 | cv_broadcast(&sc->detach_cv); |
| 1731 | |
| 1732 | mutex_exit(sc->lock); |
| 1733 | |
| 1734 | return revents; |
| 1735 | } |
| 1736 | |
| 1737 | static void |
| 1738 | filt_midirdetach(struct knote *kn) |
| 1739 | { |
| 1740 | struct midi_softc *sc = kn->kn_hook; |
| 1741 | |
| 1742 | mutex_enter(sc->lock); |
| 1743 | SLIST_REMOVE(&sc->rsel.sel_klist, kn, knote, kn_selnext); |
| 1744 | mutex_exit(sc->lock); |
| 1745 | } |
| 1746 | |
| 1747 | static int |
| 1748 | filt_midiread(struct knote *kn, long hint) |
| 1749 | { |
| 1750 | struct midi_softc *sc = kn->kn_hook; |
| 1751 | MIDI_BUF_DECLARE(buf); |
| 1752 | |
| 1753 | (void)buf_end; |
| 1754 | if (hint != NOTE_SUBMIT) |
| 1755 | mutex_enter(sc->lock); |
| 1756 | MIDI_BUF_CONSUMER_INIT(&sc->inbuf,buf); |
| 1757 | kn->kn_data = buf_lim - buf_cur; |
| 1758 | if (hint != NOTE_SUBMIT) |
| 1759 | mutex_exit(sc->lock); |
| 1760 | return (kn->kn_data > 0); |
| 1761 | } |
| 1762 | |
| 1763 | static const struct filterops midiread_filtops = |
| 1764 | { 1, NULL, filt_midirdetach, filt_midiread }; |
| 1765 | |
| 1766 | static void |
| 1767 | filt_midiwdetach(struct knote *kn) |
| 1768 | { |
| 1769 | struct midi_softc *sc = kn->kn_hook; |
| 1770 | |
| 1771 | mutex_enter(sc->lock); |
| 1772 | SLIST_REMOVE(&sc->wsel.sel_klist, kn, knote, kn_selnext); |
| 1773 | mutex_exit(sc->lock); |
| 1774 | } |
| 1775 | |
| 1776 | static int |
| 1777 | filt_midiwrite(struct knote *kn, long hint) |
| 1778 | { |
| 1779 | struct midi_softc *sc = kn->kn_hook; |
| 1780 | MIDI_BUF_DECLARE(idx); |
| 1781 | MIDI_BUF_DECLARE(buf); |
| 1782 | |
| 1783 | mutex_exit(sc->lock); |
| 1784 | sc->refcnt++; |
| 1785 | mutex_enter(sc->lock); |
| 1786 | |
| 1787 | (void)idx_end; (void)buf_end; |
| 1788 | if (hint != NOTE_SUBMIT) |
| 1789 | mutex_enter(sc->lock); |
| 1790 | MIDI_BUF_PRODUCER_INIT(&sc->outbuf,idx); |
| 1791 | MIDI_BUF_PRODUCER_INIT(&sc->outbuf,buf); |
| 1792 | kn->kn_data = ((buf_lim - buf_cur)-1)>>1; |
| 1793 | if (kn->kn_data > idx_lim - idx_cur) |
| 1794 | kn->kn_data = idx_lim - idx_cur; |
| 1795 | if (hint != NOTE_SUBMIT) |
| 1796 | mutex_exit(sc->lock); |
| 1797 | |
| 1798 | // XXXMRG -- move this up, avoid the relock? |
| 1799 | mutex_enter(sc->lock); |
| 1800 | if (--sc->refcnt < 0) |
| 1801 | cv_broadcast(&sc->detach_cv); |
| 1802 | mutex_exit(sc->lock); |
| 1803 | |
| 1804 | return (kn->kn_data > 0); |
| 1805 | } |
| 1806 | |
| 1807 | static const struct filterops midiwrite_filtops = |
| 1808 | { 1, NULL, filt_midiwdetach, filt_midiwrite }; |
| 1809 | |
| 1810 | int |
| 1811 | midikqfilter(dev_t dev, struct knote *kn) |
| 1812 | { |
| 1813 | struct midi_softc *sc = |
| 1814 | device_lookup_private(&midi_cd, MIDIUNIT(dev)); |
| 1815 | struct klist *klist; |
| 1816 | |
| 1817 | mutex_exit(sc->lock); |
| 1818 | sc->refcnt++; |
| 1819 | mutex_enter(sc->lock); |
| 1820 | |
| 1821 | switch (kn->kn_filter) { |
| 1822 | case EVFILT_READ: |
| 1823 | klist = &sc->rsel.sel_klist; |
| 1824 | kn->kn_fop = &midiread_filtops; |
| 1825 | break; |
| 1826 | |
| 1827 | case EVFILT_WRITE: |
| 1828 | klist = &sc->wsel.sel_klist; |
| 1829 | kn->kn_fop = &midiwrite_filtops; |
| 1830 | break; |
| 1831 | |
| 1832 | default: |
| 1833 | return (EINVAL); |
| 1834 | } |
| 1835 | |
| 1836 | kn->kn_hook = sc; |
| 1837 | |
| 1838 | mutex_enter(sc->lock); |
| 1839 | SLIST_INSERT_HEAD(klist, kn, kn_selnext); |
| 1840 | if (--sc->refcnt < 0) |
| 1841 | cv_broadcast(&sc->detach_cv); |
| 1842 | mutex_exit(sc->lock); |
| 1843 | |
| 1844 | return (0); |
| 1845 | } |
| 1846 | |
| 1847 | void |
| 1848 | midi_getinfo(dev_t dev, struct midi_info *mi) |
| 1849 | { |
| 1850 | struct midi_softc *sc; |
| 1851 | |
| 1852 | sc = device_lookup_private(&midi_cd, MIDIUNIT(dev)); |
| 1853 | if (sc == NULL) |
| 1854 | return; |
| 1855 | mutex_enter(sc->lock); |
| 1856 | sc->hw_if->getinfo(sc->hw_hdl, mi); |
| 1857 | mutex_exit(sc->lock); |
| 1858 | } |
| 1859 | |
| 1860 | #elif NMIDIBUS > 0 /* but NMIDI == 0 */ |
| 1861 | |
| 1862 | void |
| 1863 | midi_register_hw_if_ext(struct midi_hw_if_ext *exthw) |
| 1864 | { |
| 1865 | |
| 1866 | /* nothing */ |
| 1867 | } |
| 1868 | |
| 1869 | #endif /* NMIDI > 0 */ |
| 1870 | |
| 1871 | #if NMIDI > 0 || NMIDIBUS > 0 |
| 1872 | |
| 1873 | device_t |
| 1874 | midi_attach_mi(const struct midi_hw_if *mhwp, void *hdlp, device_t dev) |
| 1875 | { |
| 1876 | struct audio_attach_args arg; |
| 1877 | |
| 1878 | if (mhwp == NULL) { |
| 1879 | panic("midi_attach_mi: NULL\n" ); |
| 1880 | return (0); |
| 1881 | } |
| 1882 | |
| 1883 | arg.type = AUDIODEV_TYPE_MIDI; |
| 1884 | arg.hwif = mhwp; |
| 1885 | arg.hdl = hdlp; |
| 1886 | return (config_found(dev, &arg, audioprint)); |
| 1887 | } |
| 1888 | |
| 1889 | #endif /* NMIDI > 0 || NMIDIBUS > 0 */ |
| 1890 | |