aboutsummaryrefslogblamecommitdiffstats
path: root/sound/oss/midi_synth.c
blob: 972edc62afd10d53ff95bd896f8aace2b86d5183 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
























































































































































































































































































































































































































































































































































































































































































































                                                                                                                
/*
 * sound/midi_synth.c
 *
 * High level midi sequencer manager for dumb MIDI interfaces.
 */
/*
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 */
/*
 * Thomas Sailer   : ioctl code reworked (vmalloc/vfree removed)
 * Andrew Veliath  : fixed running status in MIDI input state machine
 */
#define USE_SEQ_MACROS
#define USE_SIMPLE_MACROS

#include "sound_config.h"

#define _MIDI_SYNTH_C_

#include "midi_synth.h"

static int      midi2synth[MAX_MIDI_DEV];
static int      sysex_state[MAX_MIDI_DEV] =
{0};
static unsigned char prev_out_status[MAX_MIDI_DEV];

#define STORE(cmd) \
{ \
  int len; \
  unsigned char obuf[8]; \
  cmd; \
  seq_input_event(obuf, len); \
}

#define _seqbuf obuf
#define _seqbufptr 0
#define _SEQ_ADVBUF(x) len=x

void
do_midi_msg(int synthno, unsigned char *msg, int mlen)
{
	switch (msg[0] & 0xf0)
	  {
	  case 0x90:
		  if (msg[2] != 0)
		    {
			    STORE(SEQ_START_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
			    break;
		    }
		  msg[2] = 64;

	  case 0x80:
		  STORE(SEQ_STOP_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
		  break;

	  case 0xA0:
		  STORE(SEQ_KEY_PRESSURE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
		  break;

	  case 0xB0:
		  STORE(SEQ_CONTROL(synthno, msg[0] & 0x0f,
				    msg[1], msg[2]));
		  break;

	  case 0xC0:
		  STORE(SEQ_SET_PATCH(synthno, msg[0] & 0x0f, msg[1]));
		  break;

	  case 0xD0:
		  STORE(SEQ_CHN_PRESSURE(synthno, msg[0] & 0x0f, msg[1]));
		  break;

	  case 0xE0:
		  STORE(SEQ_BENDER(synthno, msg[0] & 0x0f,
			      (msg[1] & 0x7f) | ((msg[2] & 0x7f) << 7)));
		  break;

	  default:
		  /* printk( "MPU: Unknown midi channel message %02x\n",  msg[0]); */
		  ;
	  }
}

static void
midi_outc(int midi_dev, int data)
{
	int             timeout;

	for (timeout = 0; timeout < 3200; timeout++)
		if (midi_devs[midi_dev]->outputc(midi_dev, (unsigned char) (data & 0xff)))
		  {
			  if (data & 0x80)	/*
						 * Status byte
						 */
				  prev_out_status[midi_dev] =
				      (unsigned char) (data & 0xff);	/*
									 * Store for running status
									 */
			  return;	/*
					 * Mission complete
					 */
		  }
	/*
	 * Sorry! No space on buffers.
	 */
	printk("Midi send timed out\n");
}

static int
prefix_cmd(int midi_dev, unsigned char status)
{
	if ((char *) midi_devs[midi_dev]->prefix_cmd == NULL)
		return 1;

	return midi_devs[midi_dev]->prefix_cmd(midi_dev, status);
}

static void
midi_synth_input(int orig_dev, unsigned char data)
{
	int             dev;
	struct midi_input_info *inc;

	static unsigned char len_tab[] =	/* # of data bytes following a status
						 */
	{
		2,		/* 8x */
		2,		/* 9x */
		2,		/* Ax */
		2,		/* Bx */
		1,		/* Cx */
		1,		/* Dx */
		2,		/* Ex */
		0		/* Fx */
	};

	if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
		return;

	if (data == 0xfe)	/* Ignore active sensing */
		return;

	dev = midi2synth[orig_dev];
	inc = &midi_devs[orig_dev]->in_info;

	switch (inc->m_state)
	  {
	  case MST_INIT:
		  if (data & 0x80)	/* MIDI status byte */
		    {
			    if ((data & 0xf0) == 0xf0)	/* Common message */
			      {
				      switch (data)
					{
					case 0xf0:	/* Sysex */
						inc->m_state = MST_SYSEX;
						break;	/* Sysex */

					case 0xf1:	/* MTC quarter frame */
					case 0xf3:	/* Song select */
						inc->m_state = MST_DATA;
						inc->m_ptr = 1;
						inc->m_left = 1;
						inc->m_buf[0] = data;
						break;

					case 0xf2:	/* Song position pointer */
						inc->m_state = MST_DATA;
						inc->m_ptr = 1;
						inc->m_left = 2;
						inc->m_buf[0] = data;
						break;

					default:
						inc->m_buf[0] = data;
						inc->m_ptr = 1;
						do_midi_msg(dev, inc->m_buf, inc->m_ptr);
						inc->m_ptr = 0;
						inc->m_left = 0;
					}
			    } else
			      {
				      inc->m_state = MST_DATA;
				      inc->m_ptr = 1;
				      inc->m_left = len_tab[(data >> 4) - 8];
				      inc->m_buf[0] = inc->m_prev_status = data;
			      }
		    } else if (inc->m_prev_status & 0x80) {
			    /* Data byte (use running status) */
			    inc->m_ptr = 2;
			    inc->m_buf[1] = data;
			    inc->m_buf[0] = inc->m_prev_status;
			    inc->m_left = len_tab[(inc->m_buf[0] >> 4) - 8] - 1;
			    if (inc->m_left > 0)
				    inc->m_state = MST_DATA; /* Not done yet */
			    else {
				    inc->m_state = MST_INIT;
				    do_midi_msg(dev, inc->m_buf, inc->m_ptr);
				    inc->m_ptr = 0;
			    }
		    }
		  break;	/* MST_INIT */

	  case MST_DATA:
		  inc->m_buf[inc->m_ptr++] = data;
		  if (--inc->m_left <= 0)
		    {
			    inc->m_state = MST_INIT;
			    do_midi_msg(dev, inc->m_buf, inc->m_ptr);
			    inc->m_ptr = 0;
		    }
		  break;	/* MST_DATA */

	  case MST_SYSEX:
		  if (data == 0xf7)	/* Sysex end */
		    {
			    inc->m_state = MST_INIT;
			    inc->m_left = 0;
			    inc->m_ptr = 0;
		    }
		  break;	/* MST_SYSEX */

	  default:
		  printk("MIDI%d: Unexpected state %d (%02x)\n", orig_dev, inc->m_state, (int) data);
		  inc->m_state = MST_INIT;
	  }
}

static void
leave_sysex(int dev)
{
	int             orig_dev = synth_devs[dev]->midi_dev;
	int             timeout = 0;

	if (!sysex_state[dev])
		return;

	sysex_state[dev] = 0;

	while (!midi_devs[orig_dev]->outputc(orig_dev, 0xf7) &&
	       timeout < 1000)
		timeout++;

	sysex_state[dev] = 0;
}

static void
midi_synth_output(int dev)
{
	/*
	 * Currently NOP
	 */
}

int midi_synth_ioctl(int dev, unsigned int cmd, void __user *arg)
{
	/*
	 * int orig_dev = synth_devs[dev]->midi_dev;
	 */

	switch (cmd) {

	case SNDCTL_SYNTH_INFO:
		if (__copy_to_user(arg, synth_devs[dev]->info, sizeof(struct synth_info)))
			return -EFAULT;
		return 0;
		
	case SNDCTL_SYNTH_MEMAVL:
		return 0x7fffffff;

	default:
		return -EINVAL;
	}
}

int
midi_synth_kill_note(int dev, int channel, int note, int velocity)
{
	int             orig_dev = synth_devs[dev]->midi_dev;
	int             msg, chn;

	if (note < 0 || note > 127)
		return 0;
	if (channel < 0 || channel > 15)
		return 0;
	if (velocity < 0)
		velocity = 0;
	if (velocity > 127)
		velocity = 127;

	leave_sysex(dev);

	msg = prev_out_status[orig_dev] & 0xf0;
	chn = prev_out_status[orig_dev] & 0x0f;

	if (chn == channel && ((msg == 0x90 && velocity == 64) || msg == 0x80))
	  {			/*
				 * Use running status
				 */
		  if (!prefix_cmd(orig_dev, note))
			  return 0;

		  midi_outc(orig_dev, note);

		  if (msg == 0x90)	/*
					 * Running status = Note on
					 */
			  midi_outc(orig_dev, 0);	/*
							   * Note on with velocity 0 == note
							   * off
							 */
		  else
			  midi_outc(orig_dev, velocity);
	} else
	  {
		  if (velocity == 64)
		    {
			    if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
				    return 0;
			    midi_outc(orig_dev, 0x90 | (channel & 0x0f));	/*
										 * Note on
										 */
			    midi_outc(orig_dev, note);
			    midi_outc(orig_dev, 0);	/*
							 * Zero G
							 */
		  } else
		    {
			    if (!prefix_cmd(orig_dev, 0x80 | (channel & 0x0f)))
				    return 0;
			    midi_outc(orig_dev, 0x80 | (channel & 0x0f));	/*
										 * Note off
										 */
			    midi_outc(orig_dev, note);
			    midi_outc(orig_dev, velocity);
		    }
	  }

	return 0;
}

int
midi_synth_set_instr(int dev, int channel, int instr_no)
{
	int             orig_dev = synth_devs[dev]->midi_dev;

	if (instr_no < 0 || instr_no > 127)
		instr_no = 0;
	if (channel < 0 || channel > 15)
		return 0;

	leave_sysex(dev);

	if (!prefix_cmd(orig_dev, 0xc0 | (channel & 0x0f)))
		return 0;
	midi_outc(orig_dev, 0xc0 | (channel & 0x0f));	/*
							 * Program change
							 */
	midi_outc(orig_dev, instr_no);

	return 0;
}

int
midi_synth_start_note(int dev, int channel, int note, int velocity)
{
	int             orig_dev = synth_devs[dev]->midi_dev;
	int             msg, chn;

	if (note < 0 || note > 127)
		return 0;
	if (channel < 0 || channel > 15)
		return 0;
	if (velocity < 0)
		velocity = 0;
	if (velocity > 127)
		velocity = 127;

	leave_sysex(dev);

	msg = prev_out_status[orig_dev] & 0xf0;
	chn = prev_out_status[orig_dev] & 0x0f;

	if (chn == channel && msg == 0x90)
	  {			/*
				 * Use running status
				 */
		  if (!prefix_cmd(orig_dev, note))
			  return 0;
		  midi_outc(orig_dev, note);
		  midi_outc(orig_dev, velocity);
	} else
	  {
		  if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
			  return 0;
		  midi_outc(orig_dev, 0x90 | (channel & 0x0f));		/*
									 * Note on
									 */
		  midi_outc(orig_dev, note);
		  midi_outc(orig_dev, velocity);
	  }
	return 0;
}

void
midi_synth_reset(int dev)
{

	leave_sysex(dev);
}

int
midi_synth_open(int dev, int mode)
{
	int             orig_dev = synth_devs[dev]->midi_dev;
	int             err;
	struct midi_input_info *inc;

	if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
		return -ENXIO;

	midi2synth[orig_dev] = dev;
	sysex_state[dev] = 0;
	prev_out_status[orig_dev] = 0;

	if ((err = midi_devs[orig_dev]->open(orig_dev, mode,
			       midi_synth_input, midi_synth_output)) < 0)
		return err;
	inc = &midi_devs[orig_dev]->in_info;

	/* save_flags(flags);
	cli(); 
	don't know against what irqhandler to protect*/
	inc->m_busy = 0;
	inc->m_state = MST_INIT;
	inc->m_ptr = 0;
	inc->m_left = 0;
	inc->m_prev_status = 0x00;
	/* restore_flags(flags); */

	return 1;
}

void
midi_synth_close(int dev)
{
	int             orig_dev = synth_devs[dev]->midi_dev;

	leave_sysex(dev);

	/*
	 * Shut up the synths by sending just single active sensing message.
	 */
	midi_devs[orig_dev]->outputc(orig_dev, 0xfe);

	midi_devs[orig_dev]->close(orig_dev);
}

void
midi_synth_hw_control(int dev, unsigned char *event)
{
}

int
midi_synth_load_patch(int dev, int format, const char __user *addr,
		      int offs, int count, int pmgr_flag)
{
	int             orig_dev = synth_devs[dev]->midi_dev;

	struct sysex_info sysex;
	int             i;
	unsigned long   left, src_offs, eox_seen = 0;
	int             first_byte = 1;
	int             hdr_size = (unsigned long) &sysex.data[0] - (unsigned long) &sysex;

	leave_sysex(dev);

	if (!prefix_cmd(orig_dev, 0xf0))
		return 0;

	if (format != SYSEX_PATCH)
	{
/*		  printk("MIDI Error: Invalid patch format (key) 0x%x\n", format);*/
		  return -EINVAL;
	}
	if (count < hdr_size)
	{
/*		printk("MIDI Error: Patch header too short\n");*/
		return -EINVAL;
	}
	count -= hdr_size;

	/*
	 * Copy the header from user space but ignore the first bytes which have
	 * been transferred already.
	 */

	if(copy_from_user(&((char *) &sysex)[offs], &(addr)[offs], hdr_size - offs))
		return -EFAULT;
 
 	if (count < sysex.len)
	{
/*		printk(KERN_WARNING "MIDI Warning: Sysex record too short (%d<%d)\n", count, (int) sysex.len);*/
		sysex.len = count;
	}
  	left = sysex.len;
  	src_offs = 0;

	for (i = 0; i < left && !signal_pending(current); i++)
	{
		unsigned char   data;

		get_user(*(unsigned char *) &data, (unsigned char __user *) &((addr)[hdr_size + i]));

		eox_seen = (i > 0 && data & 0x80);	/* End of sysex */

		if (eox_seen && data != 0xf7)
			data = 0xf7;

		if (i == 0)
		{
			if (data != 0xf0)
			{
				printk(KERN_WARNING "midi_synth: Sysex start missing\n");
				return -EINVAL;
			}
		}
		while (!midi_devs[orig_dev]->outputc(orig_dev, (unsigned char) (data & 0xff)) &&
			!signal_pending(current))
			schedule();

		if (!first_byte && data & 0x80)
			return 0;
		first_byte = 0;
	}

	if (!eox_seen)
		midi_outc(orig_dev, 0xf7);
	return 0;
}
  
void midi_synth_panning(int dev, int channel, int pressure)
{
}
  
void midi_synth_aftertouch(int dev, int channel, int pressure)
{
	int             orig_dev = synth_devs[dev]->midi_dev;
	int             msg, chn;

	if (pressure < 0 || pressure > 127)
		return;
	if (channel < 0 || channel > 15)
		return;

	leave_sysex(dev);

	msg = prev_out_status[orig_dev] & 0xf0;
	chn = prev_out_status[orig_dev] & 0x0f;

	if (msg != 0xd0 || chn != channel)	/*
						 * Test for running status
						 */
	  {
		  if (!prefix_cmd(orig_dev, 0xd0 | (channel & 0x0f)))
			  return;
		  midi_outc(orig_dev, 0xd0 | (channel & 0x0f));		/*
									 * Channel pressure
									 */
	} else if (!prefix_cmd(orig_dev, pressure))
		return;

	midi_outc(orig_dev, pressure);
}

void
midi_synth_controller(int dev, int channel, int ctrl_num, int value)
{
	int             orig_dev = synth_devs[dev]->midi_dev;
	int             chn, msg;

	if (ctrl_num < 0 || ctrl_num > 127)
		return;
	if (channel < 0 || channel > 15)
		return;

	leave_sysex(dev);

	msg = prev_out_status[orig_dev] & 0xf0;
	chn = prev_out_status[orig_dev] & 0x0f;

	if (msg != 0xb0 || chn != channel)
	  {
		  if (!prefix_cmd(orig_dev, 0xb0 | (channel & 0x0f)))
			  return;
		  midi_outc(orig_dev, 0xb0 | (channel & 0x0f));
	} else if (!prefix_cmd(orig_dev, ctrl_num))
		return;

	midi_outc(orig_dev, ctrl_num);
	midi_outc(orig_dev, value & 0x7f);
}

void
midi_synth_bender(int dev, int channel, int value)
{
	int             orig_dev = synth_devs[dev]->midi_dev;
	int             msg, prev_chn;

	if (channel < 0 || channel > 15)
		return;

	if (value < 0 || value > 16383)
		return;

	leave_sysex(dev);

	msg = prev_out_status[orig_dev] & 0xf0;
	prev_chn = prev_out_status[orig_dev] & 0x0f;

	if (msg != 0xd0 || prev_chn != channel)		/*
							 * Test for running status
							 */
	  {
		  if (!prefix_cmd(orig_dev, 0xe0 | (channel & 0x0f)))
			  return;
		  midi_outc(orig_dev, 0xe0 | (channel & 0x0f));
	} else if (!prefix_cmd(orig_dev, value & 0x7f))
		return;

	midi_outc(orig_dev, value & 0x7f);
	midi_outc(orig_dev, (value >> 7) & 0x7f);
}

void
midi_synth_setup_voice(int dev, int voice, int channel)
{
}

int
midi_synth_send_sysex(int dev, unsigned char *bytes, int len)
{
	int             orig_dev = synth_devs[dev]->midi_dev;
	int             i;

	for (i = 0; i < len; i++)
	  {
		  switch (bytes[i])
		    {
		    case 0xf0:	/* Start sysex */
			    if (!prefix_cmd(orig_dev, 0xf0))
				    return 0;
			    sysex_state[dev] = 1;
			    break;

		    case 0xf7:	/* End sysex */
			    if (!sysex_state[dev])	/* Orphan sysex end */
				    return 0;
			    sysex_state[dev] = 0;
			    break;

		    default:
			    if (!sysex_state[dev])
				    return 0;

			    if (bytes[i] & 0x80)	/* Error. Another message before sysex end */
			      {
				      bytes[i] = 0xf7;	/* Sysex end */
				      sysex_state[dev] = 0;
			      }
		    }

		  if (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]))
		    {
/*
 * Hardware level buffer is full. Abort the sysex message.
 */

			    int             timeout = 0;

			    bytes[i] = 0xf7;
			    sysex_state[dev] = 0;

			    while (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]) &&
				   timeout < 1000)
				    timeout++;
		    }
		  if (!sysex_state[dev])
			  return 0;
	  }

	return 0;
}