1 /*
2 * sound/oss/midi_synth.c
3 *
4 * High level midi sequencer manager for dumb MIDI interfaces.
5 */
6 /*
7 * Copyright (C) by Hannu Savolainen 1993-1997
8 *
9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
11 * for more info.
12 */
13 /*
14 * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
15 * Andrew Veliath : fixed running status in MIDI input state machine
16 */
17 #define USE_SEQ_MACROS
18 #define USE_SIMPLE_MACROS
19
20 #include "sound_config.h"
21
22 #define _MIDI_SYNTH_C_
23
24 #include "midi_synth.h"
25
26 static int midi2synth[MAX_MIDI_DEV];
27 static int sysex_state[MAX_MIDI_DEV] =
28 {0};
29 static unsigned char prev_out_status[MAX_MIDI_DEV];
30
31 #define STORE(cmd) \
32 { \
33 int len; \
34 unsigned char obuf[8]; \
35 cmd; \
36 seq_input_event(obuf, len); \
37 }
38
39 #define _seqbuf obuf
40 #define _seqbufptr 0
41 #define _SEQ_ADVBUF(x) len=x
42
43 void
do_midi_msg(int synthno,unsigned char * msg,int mlen)44 do_midi_msg(int synthno, unsigned char *msg, int mlen)
45 {
46 switch (msg[0] & 0xf0)
47 {
48 case 0x90:
49 if (msg[2] != 0)
50 {
51 STORE(SEQ_START_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
52 break;
53 }
54 msg[2] = 64;
55
56 case 0x80:
57 STORE(SEQ_STOP_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
58 break;
59
60 case 0xA0:
61 STORE(SEQ_KEY_PRESSURE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
62 break;
63
64 case 0xB0:
65 STORE(SEQ_CONTROL(synthno, msg[0] & 0x0f,
66 msg[1], msg[2]));
67 break;
68
69 case 0xC0:
70 STORE(SEQ_SET_PATCH(synthno, msg[0] & 0x0f, msg[1]));
71 break;
72
73 case 0xD0:
74 STORE(SEQ_CHN_PRESSURE(synthno, msg[0] & 0x0f, msg[1]));
75 break;
76
77 case 0xE0:
78 STORE(SEQ_BENDER(synthno, msg[0] & 0x0f,
79 (msg[1] & 0x7f) | ((msg[2] & 0x7f) << 7)));
80 break;
81
82 default:
83 /* printk( "MPU: Unknown midi channel message %02x\n", msg[0]); */
84 ;
85 }
86 }
87 EXPORT_SYMBOL(do_midi_msg);
88
89 static void
midi_outc(int midi_dev,int data)90 midi_outc(int midi_dev, int data)
91 {
92 int timeout;
93
94 for (timeout = 0; timeout < 3200; timeout++)
95 if (midi_devs[midi_dev]->outputc(midi_dev, (unsigned char) (data & 0xff)))
96 {
97 if (data & 0x80) /*
98 * Status byte
99 */
100 prev_out_status[midi_dev] =
101 (unsigned char) (data & 0xff); /*
102 * Store for running status
103 */
104 return; /*
105 * Mission complete
106 */
107 }
108 /*
109 * Sorry! No space on buffers.
110 */
111 printk("Midi send timed out\n");
112 }
113
114 static int
prefix_cmd(int midi_dev,unsigned char status)115 prefix_cmd(int midi_dev, unsigned char status)
116 {
117 if ((char *) midi_devs[midi_dev]->prefix_cmd == NULL)
118 return 1;
119
120 return midi_devs[midi_dev]->prefix_cmd(midi_dev, status);
121 }
122
123 static void
midi_synth_input(int orig_dev,unsigned char data)124 midi_synth_input(int orig_dev, unsigned char data)
125 {
126 int dev;
127 struct midi_input_info *inc;
128
129 static unsigned char len_tab[] = /* # of data bytes following a status
130 */
131 {
132 2, /* 8x */
133 2, /* 9x */
134 2, /* Ax */
135 2, /* Bx */
136 1, /* Cx */
137 1, /* Dx */
138 2, /* Ex */
139 0 /* Fx */
140 };
141
142 if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
143 return;
144
145 if (data == 0xfe) /* Ignore active sensing */
146 return;
147
148 dev = midi2synth[orig_dev];
149 inc = &midi_devs[orig_dev]->in_info;
150
151 switch (inc->m_state)
152 {
153 case MST_INIT:
154 if (data & 0x80) /* MIDI status byte */
155 {
156 if ((data & 0xf0) == 0xf0) /* Common message */
157 {
158 switch (data)
159 {
160 case 0xf0: /* Sysex */
161 inc->m_state = MST_SYSEX;
162 break; /* Sysex */
163
164 case 0xf1: /* MTC quarter frame */
165 case 0xf3: /* Song select */
166 inc->m_state = MST_DATA;
167 inc->m_ptr = 1;
168 inc->m_left = 1;
169 inc->m_buf[0] = data;
170 break;
171
172 case 0xf2: /* Song position pointer */
173 inc->m_state = MST_DATA;
174 inc->m_ptr = 1;
175 inc->m_left = 2;
176 inc->m_buf[0] = data;
177 break;
178
179 default:
180 inc->m_buf[0] = data;
181 inc->m_ptr = 1;
182 do_midi_msg(dev, inc->m_buf, inc->m_ptr);
183 inc->m_ptr = 0;
184 inc->m_left = 0;
185 }
186 } else
187 {
188 inc->m_state = MST_DATA;
189 inc->m_ptr = 1;
190 inc->m_left = len_tab[(data >> 4) - 8];
191 inc->m_buf[0] = inc->m_prev_status = data;
192 }
193 } else if (inc->m_prev_status & 0x80) {
194 /* Data byte (use running status) */
195 inc->m_ptr = 2;
196 inc->m_buf[1] = data;
197 inc->m_buf[0] = inc->m_prev_status;
198 inc->m_left = len_tab[(inc->m_buf[0] >> 4) - 8] - 1;
199 if (inc->m_left > 0)
200 inc->m_state = MST_DATA; /* Not done yet */
201 else {
202 inc->m_state = MST_INIT;
203 do_midi_msg(dev, inc->m_buf, inc->m_ptr);
204 inc->m_ptr = 0;
205 }
206 }
207 break; /* MST_INIT */
208
209 case MST_DATA:
210 inc->m_buf[inc->m_ptr++] = data;
211 if (--inc->m_left <= 0)
212 {
213 inc->m_state = MST_INIT;
214 do_midi_msg(dev, inc->m_buf, inc->m_ptr);
215 inc->m_ptr = 0;
216 }
217 break; /* MST_DATA */
218
219 case MST_SYSEX:
220 if (data == 0xf7) /* Sysex end */
221 {
222 inc->m_state = MST_INIT;
223 inc->m_left = 0;
224 inc->m_ptr = 0;
225 }
226 break; /* MST_SYSEX */
227
228 default:
229 printk("MIDI%d: Unexpected state %d (%02x)\n", orig_dev, inc->m_state, (int) data);
230 inc->m_state = MST_INIT;
231 }
232 }
233
234 static void
leave_sysex(int dev)235 leave_sysex(int dev)
236 {
237 int orig_dev = synth_devs[dev]->midi_dev;
238 int timeout = 0;
239
240 if (!sysex_state[dev])
241 return;
242
243 sysex_state[dev] = 0;
244
245 while (!midi_devs[orig_dev]->outputc(orig_dev, 0xf7) &&
246 timeout < 1000)
247 timeout++;
248
249 sysex_state[dev] = 0;
250 }
251
252 static void
midi_synth_output(int dev)253 midi_synth_output(int dev)
254 {
255 /*
256 * Currently NOP
257 */
258 }
259
midi_synth_ioctl(int dev,unsigned int cmd,void __user * arg)260 int midi_synth_ioctl(int dev, unsigned int cmd, void __user *arg)
261 {
262 /*
263 * int orig_dev = synth_devs[dev]->midi_dev;
264 */
265
266 switch (cmd) {
267
268 case SNDCTL_SYNTH_INFO:
269 if (__copy_to_user(arg, synth_devs[dev]->info, sizeof(struct synth_info)))
270 return -EFAULT;
271 return 0;
272
273 case SNDCTL_SYNTH_MEMAVL:
274 return 0x7fffffff;
275
276 default:
277 return -EINVAL;
278 }
279 }
280 EXPORT_SYMBOL(midi_synth_ioctl);
281
282 int
midi_synth_kill_note(int dev,int channel,int note,int velocity)283 midi_synth_kill_note(int dev, int channel, int note, int velocity)
284 {
285 int orig_dev = synth_devs[dev]->midi_dev;
286 int msg, chn;
287
288 if (note < 0 || note > 127)
289 return 0;
290 if (channel < 0 || channel > 15)
291 return 0;
292 if (velocity < 0)
293 velocity = 0;
294 if (velocity > 127)
295 velocity = 127;
296
297 leave_sysex(dev);
298
299 msg = prev_out_status[orig_dev] & 0xf0;
300 chn = prev_out_status[orig_dev] & 0x0f;
301
302 if (chn == channel && ((msg == 0x90 && velocity == 64) || msg == 0x80))
303 { /*
304 * Use running status
305 */
306 if (!prefix_cmd(orig_dev, note))
307 return 0;
308
309 midi_outc(orig_dev, note);
310
311 if (msg == 0x90) /*
312 * Running status = Note on
313 */
314 midi_outc(orig_dev, 0); /*
315 * Note on with velocity 0 == note
316 * off
317 */
318 else
319 midi_outc(orig_dev, velocity);
320 } else
321 {
322 if (velocity == 64)
323 {
324 if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
325 return 0;
326 midi_outc(orig_dev, 0x90 | (channel & 0x0f)); /*
327 * Note on
328 */
329 midi_outc(orig_dev, note);
330 midi_outc(orig_dev, 0); /*
331 * Zero G
332 */
333 } else
334 {
335 if (!prefix_cmd(orig_dev, 0x80 | (channel & 0x0f)))
336 return 0;
337 midi_outc(orig_dev, 0x80 | (channel & 0x0f)); /*
338 * Note off
339 */
340 midi_outc(orig_dev, note);
341 midi_outc(orig_dev, velocity);
342 }
343 }
344
345 return 0;
346 }
347 EXPORT_SYMBOL(midi_synth_kill_note);
348
349 int
midi_synth_set_instr(int dev,int channel,int instr_no)350 midi_synth_set_instr(int dev, int channel, int instr_no)
351 {
352 int orig_dev = synth_devs[dev]->midi_dev;
353
354 if (instr_no < 0 || instr_no > 127)
355 instr_no = 0;
356 if (channel < 0 || channel > 15)
357 return 0;
358
359 leave_sysex(dev);
360
361 if (!prefix_cmd(orig_dev, 0xc0 | (channel & 0x0f)))
362 return 0;
363 midi_outc(orig_dev, 0xc0 | (channel & 0x0f)); /*
364 * Program change
365 */
366 midi_outc(orig_dev, instr_no);
367
368 return 0;
369 }
370 EXPORT_SYMBOL(midi_synth_set_instr);
371
372 int
midi_synth_start_note(int dev,int channel,int note,int velocity)373 midi_synth_start_note(int dev, int channel, int note, int velocity)
374 {
375 int orig_dev = synth_devs[dev]->midi_dev;
376 int msg, chn;
377
378 if (note < 0 || note > 127)
379 return 0;
380 if (channel < 0 || channel > 15)
381 return 0;
382 if (velocity < 0)
383 velocity = 0;
384 if (velocity > 127)
385 velocity = 127;
386
387 leave_sysex(dev);
388
389 msg = prev_out_status[orig_dev] & 0xf0;
390 chn = prev_out_status[orig_dev] & 0x0f;
391
392 if (chn == channel && msg == 0x90)
393 { /*
394 * Use running status
395 */
396 if (!prefix_cmd(orig_dev, note))
397 return 0;
398 midi_outc(orig_dev, note);
399 midi_outc(orig_dev, velocity);
400 } else
401 {
402 if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
403 return 0;
404 midi_outc(orig_dev, 0x90 | (channel & 0x0f)); /*
405 * Note on
406 */
407 midi_outc(orig_dev, note);
408 midi_outc(orig_dev, velocity);
409 }
410 return 0;
411 }
412 EXPORT_SYMBOL(midi_synth_start_note);
413
414 void
midi_synth_reset(int dev)415 midi_synth_reset(int dev)
416 {
417
418 leave_sysex(dev);
419 }
420 EXPORT_SYMBOL(midi_synth_reset);
421
422 int
midi_synth_open(int dev,int mode)423 midi_synth_open(int dev, int mode)
424 {
425 int orig_dev = synth_devs[dev]->midi_dev;
426 int err;
427 struct midi_input_info *inc;
428
429 if (orig_dev < 0 || orig_dev >= num_midis || midi_devs[orig_dev] == NULL)
430 return -ENXIO;
431
432 midi2synth[orig_dev] = dev;
433 sysex_state[dev] = 0;
434 prev_out_status[orig_dev] = 0;
435
436 if ((err = midi_devs[orig_dev]->open(orig_dev, mode,
437 midi_synth_input, midi_synth_output)) < 0)
438 return err;
439 inc = &midi_devs[orig_dev]->in_info;
440
441 /* save_flags(flags);
442 cli();
443 don't know against what irqhandler to protect*/
444 inc->m_busy = 0;
445 inc->m_state = MST_INIT;
446 inc->m_ptr = 0;
447 inc->m_left = 0;
448 inc->m_prev_status = 0x00;
449 /* restore_flags(flags); */
450
451 return 1;
452 }
453 EXPORT_SYMBOL(midi_synth_open);
454
455 void
midi_synth_close(int dev)456 midi_synth_close(int dev)
457 {
458 int orig_dev = synth_devs[dev]->midi_dev;
459
460 leave_sysex(dev);
461
462 /*
463 * Shut up the synths by sending just single active sensing message.
464 */
465 midi_devs[orig_dev]->outputc(orig_dev, 0xfe);
466
467 midi_devs[orig_dev]->close(orig_dev);
468 }
469 EXPORT_SYMBOL(midi_synth_close);
470
471 void
midi_synth_hw_control(int dev,unsigned char * event)472 midi_synth_hw_control(int dev, unsigned char *event)
473 {
474 }
475 EXPORT_SYMBOL(midi_synth_hw_control);
476
477 int
midi_synth_load_patch(int dev,int format,const char __user * addr,int count,int pmgr_flag)478 midi_synth_load_patch(int dev, int format, const char __user *addr,
479 int count, int pmgr_flag)
480 {
481 int orig_dev = synth_devs[dev]->midi_dev;
482
483 struct sysex_info sysex;
484 int i;
485 unsigned long left, src_offs, eox_seen = 0;
486 int first_byte = 1;
487 int hdr_size = (unsigned long) &sysex.data[0] - (unsigned long) &sysex;
488
489 leave_sysex(dev);
490
491 if (!prefix_cmd(orig_dev, 0xf0))
492 return 0;
493
494 /* Invalid patch format */
495 if (format != SYSEX_PATCH)
496 return -EINVAL;
497
498 /* Patch header too short */
499 if (count < hdr_size)
500 return -EINVAL;
501
502 count -= hdr_size;
503
504 /*
505 * Copy the header from user space
506 */
507
508 if (copy_from_user(&sysex, addr, hdr_size))
509 return -EFAULT;
510
511 /* Sysex record too short */
512 if ((unsigned)count < (unsigned)sysex.len)
513 sysex.len = count;
514
515 left = sysex.len;
516 src_offs = 0;
517
518 for (i = 0; i < left && !signal_pending(current); i++)
519 {
520 unsigned char data;
521
522 if (get_user(data,
523 (unsigned char __user *)(addr + hdr_size + i)))
524 return -EFAULT;
525
526 eox_seen = (i > 0 && data & 0x80); /* End of sysex */
527
528 if (eox_seen && data != 0xf7)
529 data = 0xf7;
530
531 if (i == 0)
532 {
533 if (data != 0xf0)
534 {
535 printk(KERN_WARNING "midi_synth: Sysex start missing\n");
536 return -EINVAL;
537 }
538 }
539 while (!midi_devs[orig_dev]->outputc(orig_dev, (unsigned char) (data & 0xff)) &&
540 !signal_pending(current))
541 schedule();
542
543 if (!first_byte && data & 0x80)
544 return 0;
545 first_byte = 0;
546 }
547
548 if (!eox_seen)
549 midi_outc(orig_dev, 0xf7);
550 return 0;
551 }
552 EXPORT_SYMBOL(midi_synth_load_patch);
553
midi_synth_panning(int dev,int channel,int pressure)554 void midi_synth_panning(int dev, int channel, int pressure)
555 {
556 }
557 EXPORT_SYMBOL(midi_synth_panning);
558
midi_synth_aftertouch(int dev,int channel,int pressure)559 void midi_synth_aftertouch(int dev, int channel, int pressure)
560 {
561 int orig_dev = synth_devs[dev]->midi_dev;
562 int msg, chn;
563
564 if (pressure < 0 || pressure > 127)
565 return;
566 if (channel < 0 || channel > 15)
567 return;
568
569 leave_sysex(dev);
570
571 msg = prev_out_status[orig_dev] & 0xf0;
572 chn = prev_out_status[orig_dev] & 0x0f;
573
574 if (msg != 0xd0 || chn != channel) /*
575 * Test for running status
576 */
577 {
578 if (!prefix_cmd(orig_dev, 0xd0 | (channel & 0x0f)))
579 return;
580 midi_outc(orig_dev, 0xd0 | (channel & 0x0f)); /*
581 * Channel pressure
582 */
583 } else if (!prefix_cmd(orig_dev, pressure))
584 return;
585
586 midi_outc(orig_dev, pressure);
587 }
588 EXPORT_SYMBOL(midi_synth_aftertouch);
589
590 void
midi_synth_controller(int dev,int channel,int ctrl_num,int value)591 midi_synth_controller(int dev, int channel, int ctrl_num, int value)
592 {
593 int orig_dev = synth_devs[dev]->midi_dev;
594 int chn, msg;
595
596 if (ctrl_num < 0 || ctrl_num > 127)
597 return;
598 if (channel < 0 || channel > 15)
599 return;
600
601 leave_sysex(dev);
602
603 msg = prev_out_status[orig_dev] & 0xf0;
604 chn = prev_out_status[orig_dev] & 0x0f;
605
606 if (msg != 0xb0 || chn != channel)
607 {
608 if (!prefix_cmd(orig_dev, 0xb0 | (channel & 0x0f)))
609 return;
610 midi_outc(orig_dev, 0xb0 | (channel & 0x0f));
611 } else if (!prefix_cmd(orig_dev, ctrl_num))
612 return;
613
614 midi_outc(orig_dev, ctrl_num);
615 midi_outc(orig_dev, value & 0x7f);
616 }
617 EXPORT_SYMBOL(midi_synth_controller);
618
619 void
midi_synth_bender(int dev,int channel,int value)620 midi_synth_bender(int dev, int channel, int value)
621 {
622 int orig_dev = synth_devs[dev]->midi_dev;
623 int msg, prev_chn;
624
625 if (channel < 0 || channel > 15)
626 return;
627
628 if (value < 0 || value > 16383)
629 return;
630
631 leave_sysex(dev);
632
633 msg = prev_out_status[orig_dev] & 0xf0;
634 prev_chn = prev_out_status[orig_dev] & 0x0f;
635
636 if (msg != 0xd0 || prev_chn != channel) /*
637 * Test for running status
638 */
639 {
640 if (!prefix_cmd(orig_dev, 0xe0 | (channel & 0x0f)))
641 return;
642 midi_outc(orig_dev, 0xe0 | (channel & 0x0f));
643 } else if (!prefix_cmd(orig_dev, value & 0x7f))
644 return;
645
646 midi_outc(orig_dev, value & 0x7f);
647 midi_outc(orig_dev, (value >> 7) & 0x7f);
648 }
649 EXPORT_SYMBOL(midi_synth_bender);
650
651 void
midi_synth_setup_voice(int dev,int voice,int channel)652 midi_synth_setup_voice(int dev, int voice, int channel)
653 {
654 }
655 EXPORT_SYMBOL(midi_synth_setup_voice);
656
657 int
midi_synth_send_sysex(int dev,unsigned char * bytes,int len)658 midi_synth_send_sysex(int dev, unsigned char *bytes, int len)
659 {
660 int orig_dev = synth_devs[dev]->midi_dev;
661 int i;
662
663 for (i = 0; i < len; i++)
664 {
665 switch (bytes[i])
666 {
667 case 0xf0: /* Start sysex */
668 if (!prefix_cmd(orig_dev, 0xf0))
669 return 0;
670 sysex_state[dev] = 1;
671 break;
672
673 case 0xf7: /* End sysex */
674 if (!sysex_state[dev]) /* Orphan sysex end */
675 return 0;
676 sysex_state[dev] = 0;
677 break;
678
679 default:
680 if (!sysex_state[dev])
681 return 0;
682
683 if (bytes[i] & 0x80) /* Error. Another message before sysex end */
684 {
685 bytes[i] = 0xf7; /* Sysex end */
686 sysex_state[dev] = 0;
687 }
688 }
689
690 if (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]))
691 {
692 /*
693 * Hardware level buffer is full. Abort the sysex message.
694 */
695
696 int timeout = 0;
697
698 bytes[i] = 0xf7;
699 sysex_state[dev] = 0;
700
701 while (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]) &&
702 timeout < 1000)
703 timeout++;
704 }
705 if (!sysex_state[dev])
706 return 0;
707 }
708
709 return 0;
710 }
711 EXPORT_SYMBOL(midi_synth_send_sysex);
712
713