summaryrefslogtreecommitdiffstats
path: root/sound/drivers/opl3/opl3_midi.c
blob: 2f6e8023e05cd19c4f6b4099a89e1f91642825e5 (plain)
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
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
 *
 *  Midi synth routines for OPL2/OPL3/OPL4 FM
 */

#undef DEBUG_ALLOC
#undef DEBUG_MIDI

#include "opl3_voice.h"
#include <sound/asoundef.h>

static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
				     struct snd_midi_channel *chan);
/*
 * The next table looks magical, but it certainly is not. Its values have
 * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
 * for i=0. This log-table converts a linear volume-scaling (0..127) to a
 * logarithmic scaling as present in the FM-synthesizer chips. so :    Volume
 * 64 =  0 db = relative volume  0 and:    Volume 32 = -6 db = relative
 * volume -8 it was implemented as a table because it is only 128 bytes and
 * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>)
 */

static const char opl3_volume_table[128] =
{
	-63, -48, -40, -35, -32, -29, -27, -26,
	-24, -23, -21, -20, -19, -18, -18, -17,
	-16, -15, -15, -14, -13, -13, -12, -12,
	-11, -11, -10, -10, -10, -9, -9, -8,
	-8, -8, -7, -7, -7, -6, -6, -6,
	-5, -5, -5, -5, -4, -4, -4, -4,
	-3, -3, -3, -3, -2, -2, -2, -2,
	-2, -1, -1, -1, -1, 0, 0, 0,
	0, 0, 0, 1, 1, 1, 1, 1,
	1, 2, 2, 2, 2, 2, 2, 2,
	3, 3, 3, 3, 3, 3, 3, 4,
	4, 4, 4, 4, 4, 4, 4, 5,
	5, 5, 5, 5, 5, 5, 5, 5,
	6, 6, 6, 6, 6, 6, 6, 6,
	6, 7, 7, 7, 7, 7, 7, 7,
	7, 7, 7, 8, 8, 8, 8, 8
};

void snd_opl3_calc_volume(unsigned char *volbyte, int vel,
			  struct snd_midi_channel *chan)
{
	int oldvol, newvol, n;
	int volume;

	volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127);
	if (volume > 127)
		volume = 127;

	oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK);

	newvol = opl3_volume_table[volume] + oldvol;
	if (newvol > OPL3_TOTAL_LEVEL_MASK)
		newvol = OPL3_TOTAL_LEVEL_MASK;
	else if (newvol < 0)
		newvol = 0;

	n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK);

	*volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK);
}

/*
 * Converts the note frequency to block and fnum values for the FM chip
 */
static const short opl3_note_table[16] =
{
	305, 323,	/* for pitch bending, -2 semitones */
	343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647,
	686, 726	/* for pitch bending, +2 semitones */
};

static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum,
				int note, struct snd_midi_channel *chan)
{
	int block = ((note / 12) & 0x07) - 1;
	int idx = (note % 12) + 2;
	int freq;

	if (chan->midi_pitchbend) {
		int pitchbend = chan->midi_pitchbend;
		int segment;

		if (pitchbend < -0x2000)
			pitchbend = -0x2000;
		if (pitchbend > 0x1FFF)
			pitchbend = 0x1FFF;

		segment = pitchbend / 0x1000;
		freq = opl3_note_table[idx+segment];
		freq += ((opl3_note_table[idx+segment+1] - freq) *
			 (pitchbend % 0x1000)) / 0x1000;
	} else {
		freq = opl3_note_table[idx];
	}

	*fnum = (unsigned char) freq;
	*blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) |
		((block << 2) & OPL3_BLOCKNUM_MASK);
}


#ifdef DEBUG_ALLOC
static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) {
	int i;
	char *str = "x.24";

	printk(KERN_DEBUG "time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
	for (i = 0; i < opl3->max_voices; i++)
		printk(KERN_CONT "%c", *(str + opl3->voices[i].state + 1));
	printk(KERN_CONT "\n");
}
#endif

/*
 * Get a FM voice (channel) to play a note on.
 */
static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op,
			  struct snd_midi_channel *chan) {
	int chan_4op_1;		/* first voice for 4op instrument */
	int chan_4op_2;		/* second voice for 4op instrument */

	struct snd_opl3_voice *vp, *vp2;
	unsigned int voice_time;
	int i;

#ifdef DEBUG_ALLOC
	char *alloc_type[3] = { "FREE     ", "CHEAP    ", "EXPENSIVE" };
#endif

	/* This is our "allocation cost" table */
	enum {
		FREE = 0, CHEAP, EXPENSIVE, END
	};

	/* Keeps track of what we are finding */
	struct best {
		unsigned int time;
		int voice;
	} best[END];
	struct best *bp;

	for (i = 0; i < END; i++) {
		best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */
		best[i].voice = -1;
	}

	/* Look through all the channels for the most suitable. */
	for (i = 0; i < opl3->max_voices; i++) {
		vp = &opl3->voices[i];

		if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL)
		  /* skip unavailable channels, allocated by
		     drum voices or by bounded 4op voices) */
			continue;

		voice_time = vp->time;
		bp = best;

		chan_4op_1 = ((i < 3) || (i > 8 && i < 12));
		chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15));
		if (instr_4op) {
			/* allocate 4op voice */
			/* skip channels unavailable to 4op instrument */
			if (!chan_4op_1)
				continue;

			if (vp->state)
				/* kill one voice, CHEAP */
				bp++;
			/* get state of bounded 2op channel
			   to be allocated for 4op instrument */
			vp2 = &opl3->voices[i + 3];
			if (vp2->state == SNDRV_OPL3_ST_ON_2OP) {
				/* kill two voices, EXPENSIVE */
				bp++;
				voice_time = (voice_time > vp->time) ?
					voice_time : vp->time;
			}
		} else {
			/* allocate 2op voice */
			if ((chan_4op_1) || (chan_4op_2))
				/* use bounded channels for 2op, CHEAP */
				bp++;
			else if (vp->state)
				/* kill one voice on 2op channel, CHEAP */
				bp++;
			/* raise kill cost to EXPENSIVE for all channels */
			if (vp->state)
				bp++;
		}
		if (voice_time < bp->time) {
			bp->time = voice_time;
			bp->voice = i;
		}
	}

	for (i = 0; i < END; i++) {
		if (best[i].voice >= 0) {
#ifdef DEBUG_ALLOC
			printk(KERN_DEBUG "%s %iop allocation on voice %i\n",
			       alloc_type[i], instr_4op ? 4 : 2,
			       best[i].voice);
#endif
			return best[i].voice;
		}
	}
	/* not found */
	return -1;
}

/* ------------------------------ */

/*
 * System timer interrupt function
 */
void snd_opl3_timer_func(struct timer_list *t)
{

	struct snd_opl3 *opl3 = from_timer(opl3, t, tlist);
	unsigned long flags;
	int again = 0;
	int i;

	spin_lock_irqsave(&opl3->voice_lock, flags);
	for (i = 0; i < opl3->max_voices; i++) {
		struct snd_opl3_voice *vp = &opl3->voices[i];
		if (vp->state > 0 && vp->note_off_check) {
			if (vp->note_off == jiffies)
				snd_opl3_note_off_unsafe(opl3, vp->note, 0,
							 vp->chan);
			else
				again++;
		}
	}
	spin_unlock_irqrestore(&opl3->voice_lock, flags);

	spin_lock_irqsave(&opl3->sys_timer_lock, flags);
	if (again)
		mod_timer(&opl3->tlist, jiffies + 1);	/* invoke again */
	else
		opl3->sys_timer_status = 0;
	spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
}

/*
 * Start system timer
 */
static void snd_opl3_start_timer(struct snd_opl3 *opl3)
{
	unsigned long flags;
	spin_lock_irqsave(&opl3->sys_timer_lock, flags);
	if (! opl3->sys_timer_status) {
		mod_timer(&opl3->tlist, jiffies + 1);
		opl3->sys_timer_status = 1;
	}
	spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
}

/* ------------------------------ */


static const int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
	0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
};

/*
 * Start a note.
 */
void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
{
	struct snd_opl3 *opl3;
	int instr_4op;

	int voice;
	struct snd_opl3_voice *vp, *vp2;
	unsigned short connect_mask;
	unsigned char connection;
	unsigned char vol_op[4];

	int extra_prg = 0;

	unsigned short reg_side;
	unsigned char op_offset;
	unsigned char voice_offset;
	unsigned short opl3_reg;
	unsigned char reg_val;
	unsigned char prg, bank;

	int key = note;
	unsigned char fnum, blocknum;
	int i;

	struct fm_patch *patch;
	struct fm_instrument *fm;
	unsigned long flags;

	opl3 = p;

#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
		   chan->number, chan->midi_program, note, vel);
#endif

	/* in SYNTH mode, application takes care of voices */
	/* in SEQ mode, drum voice numbers are notes on drum channel */
	if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
		if (chan->drum_channel) {
			/* percussion instruments are located in bank 128 */
			bank = 128;
			prg = note;
		} else {
			bank = chan->gm_bank_select;
			prg = chan->midi_program;
		}
	} else {
		/* Prepare for OSS mode */
		if (chan->number >= MAX_OPL3_VOICES)
			return;

		/* OSS instruments are located in bank 127 */
		bank = 127;
		prg = chan->midi_program;
	}

	spin_lock_irqsave(&opl3->voice_lock, flags);

	if (use_internal_drums) {
		snd_opl3_drum_switch(opl3, note, vel, 1, chan);
		spin_unlock_irqrestore(&opl3->voice_lock, flags);
		return;
	}

 __extra_prg:
	patch = snd_opl3_find_patch(opl3, prg, bank, 0);
	if (!patch) {
		spin_unlock_irqrestore(&opl3->voice_lock, flags);
		return;
	}

	fm = &patch->inst;
	switch (patch->type) {
	case FM_PATCH_OPL2:
		instr_4op = 0;
		break;
	case FM_PATCH_OPL3:
		if (opl3->hardware >= OPL3_HW_OPL3) {
			instr_4op = 1;
			break;
		}
		/* fall through */
	default:
		spin_unlock_irqrestore(&opl3->voice_lock, flags);
		return;
	}
#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "  --> OPL%i instrument: %s\n",
		   instr_4op ? 3 : 2, patch->name);
#endif
	/* in SYNTH mode, application takes care of voices */
	/* in SEQ mode, allocate voice on free OPL3 channel */
	if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
		voice = opl3_get_voice(opl3, instr_4op, chan);
	} else {
		/* remap OSS voice */
		voice = snd_opl3_oss_map[chan->number];		
	}

	if (voice < 0) {
		spin_unlock_irqrestore(&opl3->voice_lock, flags);
		return;
	}

	if (voice < MAX_OPL2_VOICES) {
		/* Left register block for voices 0 .. 8 */
		reg_side = OPL3_LEFT;
		voice_offset = voice;
		connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
	} else {
		/* Right register block for voices 9 .. 17 */
		reg_side = OPL3_RIGHT;
		voice_offset = voice - MAX_OPL2_VOICES;
		connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
	}

	/* kill voice on channel */
	vp = &opl3->voices[voice];
	if (vp->state > 0) {
		opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
		reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
		opl3->command(opl3, opl3_reg, reg_val);
	}
	if (instr_4op) {
		vp2 = &opl3->voices[voice + 3];
		if (vp->state > 0) {
			opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
					       voice_offset + 3);
			reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
			opl3->command(opl3, opl3_reg, reg_val);
		}
	}

	/* set connection register */
	if (instr_4op) {
		if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
			opl3->connection_reg |= connect_mask;
			/* set connection bit */
			opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
			opl3->command(opl3, opl3_reg, opl3->connection_reg);
		}
	} else {
		if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
			opl3->connection_reg &= ~connect_mask;
			/* clear connection bit */
			opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
			opl3->command(opl3, opl3_reg, opl3->connection_reg);
		}
	}

#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "  --> setting OPL3 connection: 0x%x\n",
		   opl3->connection_reg);
#endif
	/*
	 * calculate volume depending on connection
	 * between FM operators (see include/opl3.h)
	 */
	for (i = 0; i < (instr_4op ? 4 : 2); i++)
		vol_op[i] = fm->op[i].ksl_level;

	connection = fm->feedback_connection[0] & 0x01;
	if (instr_4op) {
		connection <<= 1;
		connection |= fm->feedback_connection[1] & 0x01;

		snd_opl3_calc_volume(&vol_op[3], vel, chan);
		switch (connection) {
		case 0x03:
			snd_opl3_calc_volume(&vol_op[2], vel, chan);
			/* fallthru */
		case 0x02:
			snd_opl3_calc_volume(&vol_op[0], vel, chan);
			break;
		case 0x01:
			snd_opl3_calc_volume(&vol_op[1], vel, chan);
		}
	} else {
		snd_opl3_calc_volume(&vol_op[1], vel, chan);
		if (connection)
			snd_opl3_calc_volume(&vol_op[0], vel, chan);
	}

	/* Program the FM voice characteristics */
	for (i = 0; i < (instr_4op ? 4 : 2); i++) {
#ifdef DEBUG_MIDI
		snd_printk(KERN_DEBUG "  --> programming operator %i\n", i);
#endif
		op_offset = snd_opl3_regmap[voice_offset][i];

		/* Set OPL3 AM_VIB register of requested voice/operator */ 
		reg_val = fm->op[i].am_vib;
		opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
		opl3->command(opl3, opl3_reg, reg_val);

		/* Set OPL3 KSL_LEVEL register of requested voice/operator */ 
		reg_val = vol_op[i];
		opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
		opl3->command(opl3, opl3_reg, reg_val);

		/* Set OPL3 ATTACK_DECAY register of requested voice/operator */ 
		reg_val = fm->op[i].attack_decay;
		opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
		opl3->command(opl3, opl3_reg, reg_val);

		/* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */ 
		reg_val = fm->op[i].sustain_release;
		opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
		opl3->command(opl3, opl3_reg, reg_val);

		/* Select waveform */
		reg_val = fm->op[i].wave_select;
		opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
		opl3->command(opl3, opl3_reg, reg_val);
	}

	/* Set operator feedback and 2op inter-operator connection */
	reg_val = fm->feedback_connection[0];
	/* Set output voice connection */
	reg_val |= OPL3_STEREO_BITS;
	if (chan->gm_pan < 43)
		reg_val &= ~OPL3_VOICE_TO_RIGHT;
	if (chan->gm_pan > 85)
		reg_val &= ~OPL3_VOICE_TO_LEFT;
	opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	if (instr_4op) {
		/* Set 4op inter-operator connection */
		reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
		/* Set output voice connection */
		reg_val |= OPL3_STEREO_BITS;
		if (chan->gm_pan < 43)
			reg_val &= ~OPL3_VOICE_TO_RIGHT;
		if (chan->gm_pan > 85)
			reg_val &= ~OPL3_VOICE_TO_LEFT;
		opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
				       voice_offset + 3);
		opl3->command(opl3, opl3_reg, reg_val);
	}

	/*
	 * Special treatment of percussion notes for fm:
	 * Requested pitch is really program, and pitch for
	 * device is whatever was specified in the patch library.
	 */
	if (fm->fix_key)
		note = fm->fix_key;
	/*
	 * use transpose if defined in patch library
	 */
	if (fm->trnsps)
		note += (fm->trnsps - 64);

	snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);

	/* Set OPL3 FNUM_LOW register of requested voice */
	opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
	opl3->command(opl3, opl3_reg, fnum);

	opl3->voices[voice].keyon_reg = blocknum;

	/* Set output sound flag */
	blocknum |= OPL3_KEYON_BIT;

#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "  --> trigger voice %i\n", voice);
#endif
	/* Set OPL3 KEYON_BLOCK register of requested voice */ 
	opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
	opl3->command(opl3, opl3_reg, blocknum);

	/* kill note after fixed duration (in centiseconds) */
	if (fm->fix_dur) {
		opl3->voices[voice].note_off = jiffies +
			(fm->fix_dur * HZ) / 100;
		snd_opl3_start_timer(opl3);
		opl3->voices[voice].note_off_check = 1;
	} else
		opl3->voices[voice].note_off_check = 0;

	/* get extra pgm, but avoid possible loops */
	extra_prg = (extra_prg) ? 0 : fm->modes;

	/* do the bookkeeping */
	vp->time = opl3->use_time++;
	vp->note = key;
	vp->chan = chan;

	if (instr_4op) {
		vp->state = SNDRV_OPL3_ST_ON_4OP;

		vp2 = &opl3->voices[voice + 3];
		vp2->time = opl3->use_time++;
		vp2->note = key;
		vp2->chan = chan;
		vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
	} else {
		if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
			/* 4op killed by 2op, release bounded voice */
			vp2 = &opl3->voices[voice + 3];
			vp2->time = opl3->use_time++;
			vp2->state = SNDRV_OPL3_ST_OFF;
		}
		vp->state = SNDRV_OPL3_ST_ON_2OP;
	}

#ifdef DEBUG_ALLOC
	debug_alloc(opl3, "note on ", voice);
#endif

	/* allocate extra program if specified in patch library */
	if (extra_prg) {
		if (extra_prg > 128) {
			bank = 128;
			/* percussions start at 35 */
			prg = extra_prg - 128 + 35 - 1;
		} else {
			bank = 0;
			prg = extra_prg - 1;
		}
#ifdef DEBUG_MIDI
		snd_printk(KERN_DEBUG " *** allocating extra program\n");
#endif
		goto __extra_prg;
	}
	spin_unlock_irqrestore(&opl3->voice_lock, flags);
}

static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
{
	unsigned short reg_side;
	unsigned char voice_offset;
	unsigned short opl3_reg;

	struct snd_opl3_voice *vp, *vp2;

	if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
		return;

	vp = &opl3->voices[voice];
	if (voice < MAX_OPL2_VOICES) {
		/* Left register block for voices 0 .. 8 */
		reg_side = OPL3_LEFT;
		voice_offset = voice;
	} else {
		/* Right register block for voices 9 .. 17 */
		reg_side = OPL3_RIGHT;
		voice_offset = voice - MAX_OPL2_VOICES;
	}

	/* kill voice */
#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "  --> kill voice %i\n", voice);
#endif
	opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
	/* clear Key ON bit */
	opl3->command(opl3, opl3_reg, vp->keyon_reg);

	/* do the bookkeeping */
	vp->time = opl3->use_time++;

	if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
		vp2 = &opl3->voices[voice + 3];

		vp2->time = opl3->use_time++;
		vp2->state = SNDRV_OPL3_ST_OFF;
	}
	vp->state = SNDRV_OPL3_ST_OFF;
#ifdef DEBUG_ALLOC
	debug_alloc(opl3, "note off", voice);
#endif

}

/*
 * Release a note in response to a midi note off.
 */
static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
				     struct snd_midi_channel *chan)
{
  	struct snd_opl3 *opl3;

	int voice;
	struct snd_opl3_voice *vp;

	opl3 = p;

#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
		   chan->number, chan->midi_program, note);
#endif

	if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
		if (chan->drum_channel && use_internal_drums) {
			snd_opl3_drum_switch(opl3, note, vel, 0, chan);
			return;
		}
		/* this loop will hopefully kill all extra voices, because
		   they are grouped by the same channel and note values */
		for (voice = 0; voice < opl3->max_voices; voice++) {
			vp = &opl3->voices[voice];
			if (vp->state > 0 && vp->chan == chan && vp->note == note) {
				snd_opl3_kill_voice(opl3, voice);
			}
		}
	} else {
		/* remap OSS voices */
		if (chan->number < MAX_OPL3_VOICES) {
			voice = snd_opl3_oss_map[chan->number];		
			snd_opl3_kill_voice(opl3, voice);
		}
	}
}

void snd_opl3_note_off(void *p, int note, int vel,
		       struct snd_midi_channel *chan)
{
	struct snd_opl3 *opl3 = p;
	unsigned long flags;

	spin_lock_irqsave(&opl3->voice_lock, flags);
	snd_opl3_note_off_unsafe(p, note, vel, chan);
	spin_unlock_irqrestore(&opl3->voice_lock, flags);
}

/*
 * key pressure change
 */
void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
{
#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "Key pressure, ch#: %i, inst#: %i\n",
		   chan->number, chan->midi_program);
#endif
}

/*
 * terminate note
 */
void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
{
#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "Terminate note, ch#: %i, inst#: %i\n",
		   chan->number, chan->midi_program);
#endif
}

static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
{
	unsigned short reg_side;
	unsigned char voice_offset;
	unsigned short opl3_reg;

	unsigned char fnum, blocknum;

	struct snd_opl3_voice *vp;

	if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
		return;

	vp = &opl3->voices[voice];
	if (vp->chan == NULL)
		return; /* not allocated? */

	if (voice < MAX_OPL2_VOICES) {
		/* Left register block for voices 0 .. 8 */
		reg_side = OPL3_LEFT;
		voice_offset = voice;
	} else {
		/* Right register block for voices 9 .. 17 */
		reg_side = OPL3_RIGHT;
		voice_offset = voice - MAX_OPL2_VOICES;
	}

	snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);

	/* Set OPL3 FNUM_LOW register of requested voice */
	opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
	opl3->command(opl3, opl3_reg, fnum);

	vp->keyon_reg = blocknum;

	/* Set output sound flag */
	blocknum |= OPL3_KEYON_BIT;

	/* Set OPL3 KEYON_BLOCK register of requested voice */ 
	opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
	opl3->command(opl3, opl3_reg, blocknum);

	vp->time = opl3->use_time++;
}

/*
 * Update voice pitch controller
 */
static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
{
	int voice;
	struct snd_opl3_voice *vp;

	unsigned long flags;

	spin_lock_irqsave(&opl3->voice_lock, flags);

	if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
		for (voice = 0; voice < opl3->max_voices; voice++) {
			vp = &opl3->voices[voice];
			if (vp->state > 0 && vp->chan == chan) {
				snd_opl3_update_pitch(opl3, voice);
			}
		}
	} else {
		/* remap OSS voices */
		if (chan->number < MAX_OPL3_VOICES) {
			voice = snd_opl3_oss_map[chan->number];		
			snd_opl3_update_pitch(opl3, voice);
		}
	}
	spin_unlock_irqrestore(&opl3->voice_lock, flags);
}

/*
 * Deal with a controller type event.  This includes all types of
 * control events, not just the midi controllers
 */
void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
{
  	struct snd_opl3 *opl3;

	opl3 = p;
#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "Controller, TYPE = %i, ch#: %i, inst#: %i\n",
		   type, chan->number, chan->midi_program);
#endif

	switch (type) {
	case MIDI_CTL_MSB_MODWHEEL:
		if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
			opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
		else 
			opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
		opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
				 opl3->drum_reg);
		break;
	case MIDI_CTL_E2_TREMOLO_DEPTH:
		if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
			opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
		else 
			opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
		opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
				 opl3->drum_reg);
		break;
	case MIDI_CTL_PITCHBEND:
		snd_opl3_pitch_ctrl(opl3, chan);
		break;
	}
}

/*
 * NRPN events
 */
void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
		   struct snd_midi_channel_set *chset)
{
#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "NRPN, ch#: %i, inst#: %i\n",
		   chan->number, chan->midi_program);
#endif
}

/*
 * receive sysex
 */
void snd_opl3_sysex(void *p, unsigned char *buf, int len,
		    int parsed, struct snd_midi_channel_set *chset)
{
#ifdef DEBUG_MIDI
	snd_printk(KERN_DEBUG "SYSEX\n");
#endif
}