aboutsummaryrefslogtreecommitdiff
path: root/sound/drivers/opl3/opl3_synth.c
blob: 301acb6b9cf9af792ddc33160989dcb8dbcc8769 (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
/*
 *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
 *                   
 *  Routines for OPL2/OPL3/OPL4 control
 *
 *   This program is free software; you can redistribute it and/or modify 
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/slab.h>
#include <sound/opl3.h>
#include <sound/asound_fm.h>

#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
#define OPL3_SUPPORT_SYNTH
#endif

/*
 *    There is 18 possible 2 OP voices
 *      (9 in the left and 9 in the right).
 *      The first OP is the modulator and 2nd is the carrier.
 *
 *      The first three voices in the both sides may be connected
 *      with another voice to a 4 OP voice. For example voice 0
 *      can be connected with voice 3. The operators of voice 3 are
 *      used as operators 3 and 4 of the new 4 OP voice.
 *      In this case the 2 OP voice number 0 is the 'first half' and
 *      voice 3 is the second.
 */


/*
 *    Register offset table for OPL2/3 voices,
 *    OPL2 / one OPL3 register array side only
 */

char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
{
/*	  OP1   OP2   OP3   OP4		*/
/*	 ------------------------	*/
	{ 0x00, 0x03, 0x08, 0x0b },
	{ 0x01, 0x04, 0x09, 0x0c },
	{ 0x02, 0x05, 0x0a, 0x0d },

	{ 0x08, 0x0b, 0x00, 0x00 },
	{ 0x09, 0x0c, 0x00, 0x00 },
	{ 0x0a, 0x0d, 0x00, 0x00 },

	{ 0x10, 0x13, 0x00, 0x00 },	/* used by percussive voices */
	{ 0x11, 0x14, 0x00, 0x00 },	/* if the percussive mode */
	{ 0x12, 0x15, 0x00, 0x00 }	/* is selected (only left reg block) */
};

EXPORT_SYMBOL(snd_opl3_regmap);

/*
 * prototypes
 */
static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);

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

/*
 * open the device exclusively
 */
int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
{
	return 0;
}

/*
 * ioctl for hwdep device:
 */
int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
		   unsigned int cmd, unsigned long arg)
{
	struct snd_opl3 *opl3 = hw->private_data;
	void __user *argp = (void __user *)arg;

	if (snd_BUG_ON(!opl3))
		return -EINVAL;

	switch (cmd) {
		/* get information */
	case SNDRV_DM_FM_IOCTL_INFO:
		{
			struct snd_dm_fm_info info;

			info.fm_mode = opl3->fm_mode;
			info.rhythm = opl3->rhythm;
			if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
				return -EFAULT;
			return 0;
		}

	case SNDRV_DM_FM_IOCTL_RESET:
#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_RESET:
#endif
		snd_opl3_reset(opl3);
		return 0;

	case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
#endif
		{
			struct snd_dm_fm_note note;
			if (copy_from_user(&note, argp, sizeof(struct snd_dm_fm_note)))
				return -EFAULT;
			return snd_opl3_play_note(opl3, &note);
		}

	case SNDRV_DM_FM_IOCTL_SET_VOICE:
#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
#endif
		{
			struct snd_dm_fm_voice voice;
			if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
				return -EFAULT;
			return snd_opl3_set_voice(opl3, &voice);
		}

	case SNDRV_DM_FM_IOCTL_SET_PARAMS:
#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
#endif
		{
			struct snd_dm_fm_params params;
			if (copy_from_user(&params, argp, sizeof(struct snd_dm_fm_params)))
				return -EFAULT;
			return snd_opl3_set_params(opl3, &params);
		}

	case SNDRV_DM_FM_IOCTL_SET_MODE:
#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
#endif
		return snd_opl3_set_mode(opl3, (int) arg);

	case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
#endif
		return snd_opl3_set_connection(opl3, (int) arg);

#ifdef OPL3_SUPPORT_SYNTH
	case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
		snd_opl3_clear_patches(opl3);
		return 0;
#endif

#ifdef CONFIG_SND_DEBUG
	default:
		snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
#endif
	}
	return -ENOTTY;
}

/*
 * close the device
 */
int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
{
	struct snd_opl3 *opl3 = hw->private_data;

	snd_opl3_reset(opl3);
	return 0;
}

#ifdef OPL3_SUPPORT_SYNTH
/*
 * write the device - load patches
 */
long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
		    loff_t *offset)
{
	struct snd_opl3 *opl3 = hw->private_data;
	long result = 0;
	int err = 0;
	struct sbi_patch inst;

	while (count >= sizeof(inst)) {
		unsigned char type;
		if (copy_from_user(&inst, buf, sizeof(inst)))
			return -EFAULT;
		if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
		    !memcmp(inst.key, FM_KEY_2OP, 4))
			type = FM_PATCH_OPL2;
		else if (!memcmp(inst.key, FM_KEY_4OP, 4))
			type = FM_PATCH_OPL3;
		else /* invalid type */
			break;
		err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
					  inst.name, inst.extension,
					  inst.data);
		if (err < 0)
			break;
		result += sizeof(inst);
		count -= sizeof(inst);
	}
	return result > 0 ? result : err;
}


/*
 * Patch management
 */

/* offsets for SBI params */
#define AM_VIB		0
#define KSL_LEVEL	2
#define ATTACK_DECAY	4
#define SUSTAIN_RELEASE	6
#define WAVE_SELECT	8

/* offset for SBI instrument */
#define CONNECTION	10
#define OFFSET_4OP	11

/*
 * load a patch, obviously.
 *
 * loaded on the given program and bank numbers with the given type
 * (FM_PATCH_OPLx).
 * data is the pointer of SBI record _without_ header (key and name).
 * name is the name string of the patch.
 * ext is the extension data of 7 bytes long (stored in name of SBI
 * data up to offset 25), or NULL to skip.
 * return 0 if successful or a negative error code.
 */
int snd_opl3_load_patch(struct snd_opl3 *opl3,
			int prog, int bank, int type,
			const char *name,
			const unsigned char *ext,
			const unsigned char *data)
{
	struct fm_patch *patch;
	int i;

	patch = snd_opl3_find_patch(opl3, prog, bank, 1);
	if (!patch)
		return -ENOMEM;

	patch->type = type;

	for (i = 0; i < 2; i++) {
		patch->inst.op[i].am_vib = data[AM_VIB + i];
		patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
		patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
		patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
		patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
	}
	patch->inst.feedback_connection[0] = data[CONNECTION];

	if (type == FM_PATCH_OPL3) {
		for (i = 0; i < 2; i++) {
			patch->inst.op[i+2].am_vib =
				data[OFFSET_4OP + AM_VIB + i];
			patch->inst.op[i+2].ksl_level =
				data[OFFSET_4OP + KSL_LEVEL + i];
			patch->inst.op[i+2].attack_decay =
				data[OFFSET_4OP + ATTACK_DECAY + i];
			patch->inst.op[i+2].sustain_release =
				data[OFFSET_4OP + SUSTAIN_RELEASE + i];
			patch->inst.op[i+2].wave_select =
				data[OFFSET_4OP + WAVE_SELECT + i];
		}
		patch->inst.feedback_connection[1] =
			data[OFFSET_4OP + CONNECTION];
	}

	if (ext) {
		patch->inst.echo_delay = ext[0];
		patch->inst.echo_atten = ext[1];
		patch->inst.chorus_spread = ext[2];
		patch->inst.trnsps = ext[3];
		patch->inst.fix_dur = ext[4];
		patch->inst.modes = ext[5];
		patch->inst.fix_key = ext[6];
	}

	if (name)
		strlcpy(patch->name, name, sizeof(patch->name));

	return 0;
}
EXPORT_SYMBOL(snd_opl3_load_patch);

/*
 * find a patch with the given program and bank numbers, returns its pointer
 * if no matching patch is found and create_patch is set, it creates a
 * new patch object.
 */
struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
				     int create_patch)
{
	/* pretty dumb hash key */
	unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
	struct fm_patch *patch;

	for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
		if (patch->prog == prog && patch->bank == bank)
			return patch;
	}
	if (!create_patch)
		return NULL;

	patch = kzalloc(sizeof(*patch), GFP_KERNEL);
	if (!patch)
		return NULL;
	patch->prog = prog;
	patch->bank = bank;
	patch->next = opl3->patch_table[key];
	opl3->patch_table[key] = patch;
	return patch;
}
EXPORT_SYMBOL(snd_opl3_find_patch);

/*
 * Clear all patches of the given OPL3 instance
 */
void snd_opl3_clear_patches(struct snd_opl3 *opl3)
{
	int i;
	for (i = 0; i <  OPL3_PATCH_HASH_SIZE; i++) {
		struct fm_patch *patch, *next;
		for (patch = opl3->patch_table[i]; patch; patch = next) {
			next = patch->next;
			kfree(patch);
		}
	}
	memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
}
#endif /* OPL3_SUPPORT_SYNTH */

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

void snd_opl3_reset(struct snd_opl3 * opl3)
{
	unsigned short opl3_reg;

	unsigned short reg_side;
	unsigned char voice_offset;

	int max_voices, i;

	max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
		MAX_OPL2_VOICES : MAX_OPL3_VOICES;

	for (i = 0; i < max_voices; i++) {
		/* Get register array side and offset of voice */
		if (i < MAX_OPL2_VOICES) {
			/* Left register block for voices 0 .. 8 */
			reg_side = OPL3_LEFT;
			voice_offset = i;
		} else {
			/* Right register block for voices 9 .. 17 */
			reg_side = OPL3_RIGHT;
			voice_offset = i - MAX_OPL2_VOICES;
		}
		opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
		opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
		opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
		opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */

		opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
		opl3->command(opl3, opl3_reg, 0x00);	/* Note off */
	}

	opl3->max_voices = MAX_OPL2_VOICES;
	opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;

	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
	opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);	/* Melodic mode */
	opl3->rhythm = 0;
}

EXPORT_SYMBOL(snd_opl3_reset);

static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
{
	unsigned short reg_side;
	unsigned char voice_offset;

	unsigned short opl3_reg;
	unsigned char reg_val;

	/* Voices 0 -  8 in OPL2 mode */
	/* Voices 0 - 17 in OPL3 mode */
	if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
			    MAX_OPL3_VOICES : MAX_OPL2_VOICES))
		return -EINVAL;

	/* Get register array side and offset of voice */
	if (note->voice < MAX_OPL2_VOICES) {
		/* Left register block for voices 0 .. 8 */
		reg_side = OPL3_LEFT;
		voice_offset = note->voice;
	} else {
		/* Right register block for voices 9 .. 17 */
		reg_side = OPL3_RIGHT;
		voice_offset = note->voice - MAX_OPL2_VOICES;
	}

	/* Set lower 8 bits of note frequency */
	reg_val = (unsigned char) note->fnum;
	opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
	opl3->command(opl3, opl3_reg, reg_val);
	
	reg_val = 0x00;
	/* Set output sound flag */
	if (note->key_on)
		reg_val |= OPL3_KEYON_BIT;
	/* Set octave */
	reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
	/* Set higher 2 bits of note frequency */
	reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;

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

	return 0;
}


static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
{
	unsigned short reg_side;
	unsigned char op_offset;
	unsigned char voice_offset;

	unsigned short opl3_reg;
	unsigned char reg_val;

	/* Only operators 1 and 2 */
	if (voice->op > 1)
		return -EINVAL;
	/* Voices 0 -  8 in OPL2 mode */
	/* Voices 0 - 17 in OPL3 mode */
	if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
			     MAX_OPL3_VOICES : MAX_OPL2_VOICES))
		return -EINVAL;

	/* Get register array side and offset of voice */
	if (voice->voice < MAX_OPL2_VOICES) {
		/* Left register block for voices 0 .. 8 */
		reg_side = OPL3_LEFT;
		voice_offset = voice->voice;
	} else {
		/* Right register block for voices 9 .. 17 */
		reg_side = OPL3_RIGHT;
		voice_offset = voice->voice - MAX_OPL2_VOICES;
	}
	/* Get register offset of operator */
	op_offset = snd_opl3_regmap[voice_offset][voice->op];

	reg_val = 0x00;
	/* Set amplitude modulation (tremolo) effect */
	if (voice->am)
		reg_val |= OPL3_TREMOLO_ON;
	/* Set vibrato effect */
	if (voice->vibrato)
		reg_val |= OPL3_VIBRATO_ON;
	/* Set sustaining sound phase */
	if (voice->do_sustain)
		reg_val |= OPL3_SUSTAIN_ON;
	/* Set keyboard scaling bit */ 
	if (voice->kbd_scale)
		reg_val |= OPL3_KSR;
	/* Set harmonic or frequency multiplier */
	reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;

	/* Set OPL3 AM_VIB register of requested voice/operator */ 
	opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Set decreasing volume of higher notes */
	reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
	/* Set output volume */
	reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;

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

	/* Set attack phase level */
	reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
	/* Set decay phase level */
	reg_val |= voice->decay & OPL3_DECAY_MASK;

	/* Set OPL3 ATTACK_DECAY register of requested voice/operator */ 
	opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Set sustain phase level */
	reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
	/* Set release phase level */
	reg_val |= voice->release & OPL3_RELEASE_MASK;

	/* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */ 
	opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Set inter-operator feedback */
	reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
	/* Set inter-operator connection */
	if (voice->connection)
		reg_val |= OPL3_CONNECTION_BIT;
	/* OPL-3 only */
	if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
		if (voice->left)
			reg_val |= OPL3_VOICE_TO_LEFT;
		if (voice->right)
			reg_val |= OPL3_VOICE_TO_RIGHT;
	}
	/* Feedback/connection bits are applicable to voice */
	opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Select waveform */
	reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
	opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	return 0;
}

static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
{
	unsigned char reg_val;

	reg_val = 0x00;
	/* Set keyboard split method */
	if (params->kbd_split)
		reg_val |= OPL3_KEYBOARD_SPLIT;
	opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);

	reg_val = 0x00;
	/* Set amplitude modulation (tremolo) depth */
	if (params->am_depth)
		reg_val |= OPL3_TREMOLO_DEPTH;
	/* Set vibrato depth */
	if (params->vib_depth)
		reg_val |= OPL3_VIBRATO_DEPTH;
	/* Set percussion mode */
	if (params->rhythm) {
		reg_val |= OPL3_PERCUSSION_ENABLE;
		opl3->rhythm = 1;
	} else {
		opl3->rhythm = 0;
	}
	/* Play percussion instruments */
	if (params->bass)
		reg_val |= OPL3_BASSDRUM_ON;
	if (params->snare)
		reg_val |= OPL3_SNAREDRUM_ON;
	if (params->tomtom)
		reg_val |= OPL3_TOMTOM_ON;
	if (params->cymbal)
		reg_val |= OPL3_CYMBAL_ON;
	if (params->hihat)
		reg_val |= OPL3_HIHAT_ON;

	opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
	return 0;
}

static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
{
	if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
		return -EINVAL;

	opl3->fm_mode = mode;
	if (opl3->hardware >= OPL3_HW_OPL3)
		opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00);	/* Clear 4-op connections */

	return 0;
}

static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
{
	unsigned char reg_val;

	/* OPL-3 only */
	if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
		return -EINVAL;

	reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
				OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
	/* Set 4-op connections */
	opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);

	return 0;
}