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 | |