1 /*
2 * Copyright (c) by Uros Bizjak <uros@kss-loka.si>
3 *
4 * Routines for OPL2/OPL3/OPL4 control
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <sound/opl3.h>
25 #include <sound/asound_fm.h>
26
27 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
28 #define OPL3_SUPPORT_SYNTH
29 #endif
30
31 /*
32 * There is 18 possible 2 OP voices
33 * (9 in the left and 9 in the right).
34 * The first OP is the modulator and 2nd is the carrier.
35 *
36 * The first three voices in the both sides may be connected
37 * with another voice to a 4 OP voice. For example voice 0
38 * can be connected with voice 3. The operators of voice 3 are
39 * used as operators 3 and 4 of the new 4 OP voice.
40 * In this case the 2 OP voice number 0 is the 'first half' and
41 * voice 3 is the second.
42 */
43
44
45 /*
46 * Register offset table for OPL2/3 voices,
47 * OPL2 / one OPL3 register array side only
48 */
49
50 char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
51 {
52 /* OP1 OP2 OP3 OP4 */
53 /* ------------------------ */
54 { 0x00, 0x03, 0x08, 0x0b },
55 { 0x01, 0x04, 0x09, 0x0c },
56 { 0x02, 0x05, 0x0a, 0x0d },
57
58 { 0x08, 0x0b, 0x00, 0x00 },
59 { 0x09, 0x0c, 0x00, 0x00 },
60 { 0x0a, 0x0d, 0x00, 0x00 },
61
62 { 0x10, 0x13, 0x00, 0x00 }, /* used by percussive voices */
63 { 0x11, 0x14, 0x00, 0x00 }, /* if the percussive mode */
64 { 0x12, 0x15, 0x00, 0x00 } /* is selected (only left reg block) */
65 };
66
67 EXPORT_SYMBOL(snd_opl3_regmap);
68
69 /*
70 * prototypes
71 */
72 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
73 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
74 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
75 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
76 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);
77
78 /* ------------------------------ */
79
80 /*
81 * open the device exclusively
82 */
snd_opl3_open(struct snd_hwdep * hw,struct file * file)83 int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
84 {
85 return 0;
86 }
87
88 /*
89 * ioctl for hwdep device:
90 */
snd_opl3_ioctl(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)91 int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
92 unsigned int cmd, unsigned long arg)
93 {
94 struct snd_opl3 *opl3 = hw->private_data;
95 void __user *argp = (void __user *)arg;
96
97 if (snd_BUG_ON(!opl3))
98 return -EINVAL;
99
100 switch (cmd) {
101 /* get information */
102 case SNDRV_DM_FM_IOCTL_INFO:
103 {
104 struct snd_dm_fm_info info;
105
106 info.fm_mode = opl3->fm_mode;
107 info.rhythm = opl3->rhythm;
108 if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
109 return -EFAULT;
110 return 0;
111 }
112
113 case SNDRV_DM_FM_IOCTL_RESET:
114 #ifdef CONFIG_SND_OSSEMUL
115 case SNDRV_DM_FM_OSS_IOCTL_RESET:
116 #endif
117 snd_opl3_reset(opl3);
118 return 0;
119
120 case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
121 #ifdef CONFIG_SND_OSSEMUL
122 case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
123 #endif
124 {
125 struct snd_dm_fm_note note;
126 if (copy_from_user(¬e, argp, sizeof(struct snd_dm_fm_note)))
127 return -EFAULT;
128 return snd_opl3_play_note(opl3, ¬e);
129 }
130
131 case SNDRV_DM_FM_IOCTL_SET_VOICE:
132 #ifdef CONFIG_SND_OSSEMUL
133 case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
134 #endif
135 {
136 struct snd_dm_fm_voice voice;
137 if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
138 return -EFAULT;
139 return snd_opl3_set_voice(opl3, &voice);
140 }
141
142 case SNDRV_DM_FM_IOCTL_SET_PARAMS:
143 #ifdef CONFIG_SND_OSSEMUL
144 case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
145 #endif
146 {
147 struct snd_dm_fm_params params;
148 if (copy_from_user(¶ms, argp, sizeof(struct snd_dm_fm_params)))
149 return -EFAULT;
150 return snd_opl3_set_params(opl3, ¶ms);
151 }
152
153 case SNDRV_DM_FM_IOCTL_SET_MODE:
154 #ifdef CONFIG_SND_OSSEMUL
155 case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
156 #endif
157 return snd_opl3_set_mode(opl3, (int) arg);
158
159 case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
160 #ifdef CONFIG_SND_OSSEMUL
161 case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
162 #endif
163 return snd_opl3_set_connection(opl3, (int) arg);
164
165 #ifdef OPL3_SUPPORT_SYNTH
166 case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
167 snd_opl3_clear_patches(opl3);
168 return 0;
169 #endif
170
171 #ifdef CONFIG_SND_DEBUG
172 default:
173 snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
174 #endif
175 }
176 return -ENOTTY;
177 }
178
179 /*
180 * close the device
181 */
snd_opl3_release(struct snd_hwdep * hw,struct file * file)182 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
183 {
184 struct snd_opl3 *opl3 = hw->private_data;
185
186 snd_opl3_reset(opl3);
187 return 0;
188 }
189
190 #ifdef OPL3_SUPPORT_SYNTH
191 /*
192 * write the device - load patches
193 */
snd_opl3_write(struct snd_hwdep * hw,const char __user * buf,long count,loff_t * offset)194 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
195 loff_t *offset)
196 {
197 struct snd_opl3 *opl3 = hw->private_data;
198 long result = 0;
199 int err = 0;
200 struct sbi_patch inst;
201
202 while (count >= sizeof(inst)) {
203 unsigned char type;
204 if (copy_from_user(&inst, buf, sizeof(inst)))
205 return -EFAULT;
206 if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
207 !memcmp(inst.key, FM_KEY_2OP, 4))
208 type = FM_PATCH_OPL2;
209 else if (!memcmp(inst.key, FM_KEY_4OP, 4))
210 type = FM_PATCH_OPL3;
211 else /* invalid type */
212 break;
213 err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
214 inst.name, inst.extension,
215 inst.data);
216 if (err < 0)
217 break;
218 result += sizeof(inst);
219 count -= sizeof(inst);
220 }
221 return result > 0 ? result : err;
222 }
223
224
225 /*
226 * Patch management
227 */
228
229 /* offsets for SBI params */
230 #define AM_VIB 0
231 #define KSL_LEVEL 2
232 #define ATTACK_DECAY 4
233 #define SUSTAIN_RELEASE 6
234 #define WAVE_SELECT 8
235
236 /* offset for SBI instrument */
237 #define CONNECTION 10
238 #define OFFSET_4OP 11
239
240 /*
241 * load a patch, obviously.
242 *
243 * loaded on the given program and bank numbers with the given type
244 * (FM_PATCH_OPLx).
245 * data is the pointer of SBI record _without_ header (key and name).
246 * name is the name string of the patch.
247 * ext is the extension data of 7 bytes long (stored in name of SBI
248 * data up to offset 25), or NULL to skip.
249 * return 0 if successful or a negative error code.
250 */
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)251 int snd_opl3_load_patch(struct snd_opl3 *opl3,
252 int prog, int bank, int type,
253 const char *name,
254 const unsigned char *ext,
255 const unsigned char *data)
256 {
257 struct fm_patch *patch;
258 int i;
259
260 patch = snd_opl3_find_patch(opl3, prog, bank, 1);
261 if (!patch)
262 return -ENOMEM;
263
264 patch->type = type;
265
266 for (i = 0; i < 2; i++) {
267 patch->inst.op[i].am_vib = data[AM_VIB + i];
268 patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
269 patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
270 patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
271 patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
272 }
273 patch->inst.feedback_connection[0] = data[CONNECTION];
274
275 if (type == FM_PATCH_OPL3) {
276 for (i = 0; i < 2; i++) {
277 patch->inst.op[i+2].am_vib =
278 data[OFFSET_4OP + AM_VIB + i];
279 patch->inst.op[i+2].ksl_level =
280 data[OFFSET_4OP + KSL_LEVEL + i];
281 patch->inst.op[i+2].attack_decay =
282 data[OFFSET_4OP + ATTACK_DECAY + i];
283 patch->inst.op[i+2].sustain_release =
284 data[OFFSET_4OP + SUSTAIN_RELEASE + i];
285 patch->inst.op[i+2].wave_select =
286 data[OFFSET_4OP + WAVE_SELECT + i];
287 }
288 patch->inst.feedback_connection[1] =
289 data[OFFSET_4OP + CONNECTION];
290 }
291
292 if (ext) {
293 patch->inst.echo_delay = ext[0];
294 patch->inst.echo_atten = ext[1];
295 patch->inst.chorus_spread = ext[2];
296 patch->inst.trnsps = ext[3];
297 patch->inst.fix_dur = ext[4];
298 patch->inst.modes = ext[5];
299 patch->inst.fix_key = ext[6];
300 }
301
302 if (name)
303 strlcpy(patch->name, name, sizeof(patch->name));
304
305 return 0;
306 }
307 EXPORT_SYMBOL(snd_opl3_load_patch);
308
309 /*
310 * find a patch with the given program and bank numbers, returns its pointer
311 * if no matching patch is found and create_patch is set, it creates a
312 * new patch object.
313 */
snd_opl3_find_patch(struct snd_opl3 * opl3,int prog,int bank,int create_patch)314 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
315 int create_patch)
316 {
317 /* pretty dumb hash key */
318 unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
319 struct fm_patch *patch;
320
321 for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
322 if (patch->prog == prog && patch->bank == bank)
323 return patch;
324 }
325 if (!create_patch)
326 return NULL;
327
328 patch = kzalloc(sizeof(*patch), GFP_KERNEL);
329 if (!patch)
330 return NULL;
331 patch->prog = prog;
332 patch->bank = bank;
333 patch->next = opl3->patch_table[key];
334 opl3->patch_table[key] = patch;
335 return patch;
336 }
337 EXPORT_SYMBOL(snd_opl3_find_patch);
338
339 /*
340 * Clear all patches of the given OPL3 instance
341 */
snd_opl3_clear_patches(struct snd_opl3 * opl3)342 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
343 {
344 int i;
345 for (i = 0; i < OPL3_PATCH_HASH_SIZE; i++) {
346 struct fm_patch *patch, *next;
347 for (patch = opl3->patch_table[i]; patch; patch = next) {
348 next = patch->next;
349 kfree(patch);
350 }
351 }
352 memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
353 }
354 #endif /* OPL3_SUPPORT_SYNTH */
355
356 /* ------------------------------ */
357
snd_opl3_reset(struct snd_opl3 * opl3)358 void snd_opl3_reset(struct snd_opl3 * opl3)
359 {
360 unsigned short opl3_reg;
361
362 unsigned short reg_side;
363 unsigned char voice_offset;
364
365 int max_voices, i;
366
367 max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
368 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
369
370 for (i = 0; i < max_voices; i++) {
371 /* Get register array side and offset of voice */
372 if (i < MAX_OPL2_VOICES) {
373 /* Left register block for voices 0 .. 8 */
374 reg_side = OPL3_LEFT;
375 voice_offset = i;
376 } else {
377 /* Right register block for voices 9 .. 17 */
378 reg_side = OPL3_RIGHT;
379 voice_offset = i - MAX_OPL2_VOICES;
380 }
381 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
382 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
383 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
384 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */
385
386 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
387 opl3->command(opl3, opl3_reg, 0x00); /* Note off */
388 }
389
390 opl3->max_voices = MAX_OPL2_VOICES;
391 opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;
392
393 opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
394 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00); /* Melodic mode */
395 opl3->rhythm = 0;
396 }
397
398 EXPORT_SYMBOL(snd_opl3_reset);
399
snd_opl3_play_note(struct snd_opl3 * opl3,struct snd_dm_fm_note * note)400 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
401 {
402 unsigned short reg_side;
403 unsigned char voice_offset;
404
405 unsigned short opl3_reg;
406 unsigned char reg_val;
407
408 /* Voices 0 - 8 in OPL2 mode */
409 /* Voices 0 - 17 in OPL3 mode */
410 if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
411 MAX_OPL3_VOICES : MAX_OPL2_VOICES))
412 return -EINVAL;
413
414 /* Get register array side and offset of voice */
415 if (note->voice < MAX_OPL2_VOICES) {
416 /* Left register block for voices 0 .. 8 */
417 reg_side = OPL3_LEFT;
418 voice_offset = note->voice;
419 } else {
420 /* Right register block for voices 9 .. 17 */
421 reg_side = OPL3_RIGHT;
422 voice_offset = note->voice - MAX_OPL2_VOICES;
423 }
424
425 /* Set lower 8 bits of note frequency */
426 reg_val = (unsigned char) note->fnum;
427 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
428 opl3->command(opl3, opl3_reg, reg_val);
429
430 reg_val = 0x00;
431 /* Set output sound flag */
432 if (note->key_on)
433 reg_val |= OPL3_KEYON_BIT;
434 /* Set octave */
435 reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
436 /* Set higher 2 bits of note frequency */
437 reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;
438
439 /* Set OPL3 KEYON_BLOCK register of requested voice */
440 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
441 opl3->command(opl3, opl3_reg, reg_val);
442
443 return 0;
444 }
445
446
snd_opl3_set_voice(struct snd_opl3 * opl3,struct snd_dm_fm_voice * voice)447 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
448 {
449 unsigned short reg_side;
450 unsigned char op_offset;
451 unsigned char voice_offset;
452
453 unsigned short opl3_reg;
454 unsigned char reg_val;
455
456 /* Only operators 1 and 2 */
457 if (voice->op > 1)
458 return -EINVAL;
459 /* Voices 0 - 8 in OPL2 mode */
460 /* Voices 0 - 17 in OPL3 mode */
461 if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
462 MAX_OPL3_VOICES : MAX_OPL2_VOICES))
463 return -EINVAL;
464
465 /* Get register array side and offset of voice */
466 if (voice->voice < MAX_OPL2_VOICES) {
467 /* Left register block for voices 0 .. 8 */
468 reg_side = OPL3_LEFT;
469 voice_offset = voice->voice;
470 } else {
471 /* Right register block for voices 9 .. 17 */
472 reg_side = OPL3_RIGHT;
473 voice_offset = voice->voice - MAX_OPL2_VOICES;
474 }
475 /* Get register offset of operator */
476 op_offset = snd_opl3_regmap[voice_offset][voice->op];
477
478 reg_val = 0x00;
479 /* Set amplitude modulation (tremolo) effect */
480 if (voice->am)
481 reg_val |= OPL3_TREMOLO_ON;
482 /* Set vibrato effect */
483 if (voice->vibrato)
484 reg_val |= OPL3_VIBRATO_ON;
485 /* Set sustaining sound phase */
486 if (voice->do_sustain)
487 reg_val |= OPL3_SUSTAIN_ON;
488 /* Set keyboard scaling bit */
489 if (voice->kbd_scale)
490 reg_val |= OPL3_KSR;
491 /* Set harmonic or frequency multiplier */
492 reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;
493
494 /* Set OPL3 AM_VIB register of requested voice/operator */
495 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
496 opl3->command(opl3, opl3_reg, reg_val);
497
498 /* Set decreasing volume of higher notes */
499 reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
500 /* Set output volume */
501 reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;
502
503 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
504 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
505 opl3->command(opl3, opl3_reg, reg_val);
506
507 /* Set attack phase level */
508 reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
509 /* Set decay phase level */
510 reg_val |= voice->decay & OPL3_DECAY_MASK;
511
512 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
513 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
514 opl3->command(opl3, opl3_reg, reg_val);
515
516 /* Set sustain phase level */
517 reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
518 /* Set release phase level */
519 reg_val |= voice->release & OPL3_RELEASE_MASK;
520
521 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
522 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
523 opl3->command(opl3, opl3_reg, reg_val);
524
525 /* Set inter-operator feedback */
526 reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
527 /* Set inter-operator connection */
528 if (voice->connection)
529 reg_val |= OPL3_CONNECTION_BIT;
530 /* OPL-3 only */
531 if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
532 if (voice->left)
533 reg_val |= OPL3_VOICE_TO_LEFT;
534 if (voice->right)
535 reg_val |= OPL3_VOICE_TO_RIGHT;
536 }
537 /* Feedback/connection bits are applicable to voice */
538 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
539 opl3->command(opl3, opl3_reg, reg_val);
540
541 /* Select waveform */
542 reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
543 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
544 opl3->command(opl3, opl3_reg, reg_val);
545
546 return 0;
547 }
548
snd_opl3_set_params(struct snd_opl3 * opl3,struct snd_dm_fm_params * params)549 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
550 {
551 unsigned char reg_val;
552
553 reg_val = 0x00;
554 /* Set keyboard split method */
555 if (params->kbd_split)
556 reg_val |= OPL3_KEYBOARD_SPLIT;
557 opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);
558
559 reg_val = 0x00;
560 /* Set amplitude modulation (tremolo) depth */
561 if (params->am_depth)
562 reg_val |= OPL3_TREMOLO_DEPTH;
563 /* Set vibrato depth */
564 if (params->vib_depth)
565 reg_val |= OPL3_VIBRATO_DEPTH;
566 /* Set percussion mode */
567 if (params->rhythm) {
568 reg_val |= OPL3_PERCUSSION_ENABLE;
569 opl3->rhythm = 1;
570 } else {
571 opl3->rhythm = 0;
572 }
573 /* Play percussion instruments */
574 if (params->bass)
575 reg_val |= OPL3_BASSDRUM_ON;
576 if (params->snare)
577 reg_val |= OPL3_SNAREDRUM_ON;
578 if (params->tomtom)
579 reg_val |= OPL3_TOMTOM_ON;
580 if (params->cymbal)
581 reg_val |= OPL3_CYMBAL_ON;
582 if (params->hihat)
583 reg_val |= OPL3_HIHAT_ON;
584
585 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
586 return 0;
587 }
588
snd_opl3_set_mode(struct snd_opl3 * opl3,int mode)589 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
590 {
591 if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
592 return -EINVAL;
593
594 opl3->fm_mode = mode;
595 if (opl3->hardware >= OPL3_HW_OPL3)
596 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00); /* Clear 4-op connections */
597
598 return 0;
599 }
600
snd_opl3_set_connection(struct snd_opl3 * opl3,int connection)601 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
602 {
603 unsigned char reg_val;
604
605 /* OPL-3 only */
606 if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
607 return -EINVAL;
608
609 reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
610 OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
611 /* Set 4-op connections */
612 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);
613
614 return 0;
615 }
616
617