1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) by Uros Bizjak <uros@kss-loka.si>
4 *
5 * Routines for OPL2/OPL3/OPL4 control
6 */
7
8 #include <linux/slab.h>
9 #include <linux/export.h>
10 #include <linux/nospec.h>
11 #include <sound/opl3.h>
12 #include <sound/asound_fm.h>
13 #include "opl3_voice.h"
14
15 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
16 #define OPL3_SUPPORT_SYNTH
17 #endif
18
19 /*
20 * There is 18 possible 2 OP voices
21 * (9 in the left and 9 in the right).
22 * The first OP is the modulator and 2nd is the carrier.
23 *
24 * The first three voices in the both sides may be connected
25 * with another voice to a 4 OP voice. For example voice 0
26 * can be connected with voice 3. The operators of voice 3 are
27 * used as operators 3 and 4 of the new 4 OP voice.
28 * In this case the 2 OP voice number 0 is the 'first half' and
29 * voice 3 is the second.
30 */
31
32
33 /*
34 * Register offset table for OPL2/3 voices,
35 * OPL2 / one OPL3 register array side only
36 */
37
38 char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
39 {
40 /* OP1 OP2 OP3 OP4 */
41 /* ------------------------ */
42 { 0x00, 0x03, 0x08, 0x0b },
43 { 0x01, 0x04, 0x09, 0x0c },
44 { 0x02, 0x05, 0x0a, 0x0d },
45
46 { 0x08, 0x0b, 0x00, 0x00 },
47 { 0x09, 0x0c, 0x00, 0x00 },
48 { 0x0a, 0x0d, 0x00, 0x00 },
49
50 { 0x10, 0x13, 0x00, 0x00 }, /* used by percussive voices */
51 { 0x11, 0x14, 0x00, 0x00 }, /* if the percussive mode */
52 { 0x12, 0x15, 0x00, 0x00 } /* is selected (only left reg block) */
53 };
54
55 EXPORT_SYMBOL(snd_opl3_regmap);
56
57 /*
58 * prototypes
59 */
60 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
61 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
62 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
63 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
64 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);
65
66 /* ------------------------------ */
67
68 /*
69 * open the device exclusively
70 */
snd_opl3_open(struct snd_hwdep * hw,struct file * file)71 int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
72 {
73 return 0;
74 }
75
76 /*
77 * ioctl for hwdep device:
78 */
snd_opl3_ioctl(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)79 int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
80 unsigned int cmd, unsigned long arg)
81 {
82 struct snd_opl3 *opl3 = hw->private_data;
83 void __user *argp = (void __user *)arg;
84
85 if (snd_BUG_ON(!opl3))
86 return -EINVAL;
87
88 switch (cmd) {
89 /* get information */
90 case SNDRV_DM_FM_IOCTL_INFO:
91 {
92 struct snd_dm_fm_info info;
93
94 memset(&info, 0, sizeof(info));
95
96 info.fm_mode = opl3->fm_mode;
97 info.rhythm = opl3->rhythm;
98 if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
99 return -EFAULT;
100 return 0;
101 }
102
103 case SNDRV_DM_FM_IOCTL_RESET:
104 #ifdef CONFIG_SND_OSSEMUL
105 case SNDRV_DM_FM_OSS_IOCTL_RESET:
106 #endif
107 snd_opl3_reset(opl3);
108 return 0;
109
110 case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
111 #ifdef CONFIG_SND_OSSEMUL
112 case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
113 #endif
114 {
115 struct snd_dm_fm_note note;
116 if (copy_from_user(¬e, argp, sizeof(struct snd_dm_fm_note)))
117 return -EFAULT;
118 return snd_opl3_play_note(opl3, ¬e);
119 }
120
121 case SNDRV_DM_FM_IOCTL_SET_VOICE:
122 #ifdef CONFIG_SND_OSSEMUL
123 case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
124 #endif
125 {
126 struct snd_dm_fm_voice voice;
127 if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
128 return -EFAULT;
129 return snd_opl3_set_voice(opl3, &voice);
130 }
131
132 case SNDRV_DM_FM_IOCTL_SET_PARAMS:
133 #ifdef CONFIG_SND_OSSEMUL
134 case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
135 #endif
136 {
137 struct snd_dm_fm_params params;
138 if (copy_from_user(¶ms, argp, sizeof(struct snd_dm_fm_params)))
139 return -EFAULT;
140 return snd_opl3_set_params(opl3, ¶ms);
141 }
142
143 case SNDRV_DM_FM_IOCTL_SET_MODE:
144 #ifdef CONFIG_SND_OSSEMUL
145 case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
146 #endif
147 return snd_opl3_set_mode(opl3, (int) arg);
148
149 case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
150 #ifdef CONFIG_SND_OSSEMUL
151 case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
152 #endif
153 return snd_opl3_set_connection(opl3, (int) arg);
154
155 #ifdef OPL3_SUPPORT_SYNTH
156 case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
157 snd_opl3_clear_patches(opl3);
158 return 0;
159 #endif
160
161 #ifdef CONFIG_SND_DEBUG
162 default:
163 snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
164 #endif
165 }
166 return -ENOTTY;
167 }
168
169 /*
170 * close the device
171 */
snd_opl3_release(struct snd_hwdep * hw,struct file * file)172 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
173 {
174 struct snd_opl3 *opl3 = hw->private_data;
175
176 snd_opl3_reset(opl3);
177 return 0;
178 }
179
180 #ifdef OPL3_SUPPORT_SYNTH
181 /*
182 * write the device - load patches
183 */
snd_opl3_write(struct snd_hwdep * hw,const char __user * buf,long count,loff_t * offset)184 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
185 loff_t *offset)
186 {
187 struct snd_opl3 *opl3 = hw->private_data;
188 long result = 0;
189 int err = 0;
190 struct sbi_patch inst;
191
192 while (count >= sizeof(inst)) {
193 unsigned char type;
194 if (copy_from_user(&inst, buf, sizeof(inst)))
195 return -EFAULT;
196 if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
197 !memcmp(inst.key, FM_KEY_2OP, 4))
198 type = FM_PATCH_OPL2;
199 else if (!memcmp(inst.key, FM_KEY_4OP, 4))
200 type = FM_PATCH_OPL3;
201 else /* invalid type */
202 break;
203 err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
204 inst.name, inst.extension,
205 inst.data);
206 if (err < 0)
207 break;
208 result += sizeof(inst);
209 count -= sizeof(inst);
210 }
211 return result > 0 ? result : err;
212 }
213
214
215 /*
216 * Patch management
217 */
218
219 /* offsets for SBI params */
220 #define AM_VIB 0
221 #define KSL_LEVEL 2
222 #define ATTACK_DECAY 4
223 #define SUSTAIN_RELEASE 6
224 #define WAVE_SELECT 8
225
226 /* offset for SBI instrument */
227 #define CONNECTION 10
228 #define OFFSET_4OP 11
229
230 /*
231 * load a patch, obviously.
232 *
233 * loaded on the given program and bank numbers with the given type
234 * (FM_PATCH_OPLx).
235 * data is the pointer of SBI record _without_ header (key and name).
236 * name is the name string of the patch.
237 * ext is the extension data of 7 bytes long (stored in name of SBI
238 * data up to offset 25), or NULL to skip.
239 * return 0 if successful or a negative error code.
240 */
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)241 int snd_opl3_load_patch(struct snd_opl3 *opl3,
242 int prog, int bank, int type,
243 const char *name,
244 const unsigned char *ext,
245 const unsigned char *data)
246 {
247 struct fm_patch *patch;
248 int i;
249
250 patch = snd_opl3_find_patch(opl3, prog, bank, 1);
251 if (!patch)
252 return -ENOMEM;
253
254 patch->type = type;
255
256 for (i = 0; i < 2; i++) {
257 patch->inst.op[i].am_vib = data[AM_VIB + i];
258 patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
259 patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
260 patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
261 patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
262 }
263 patch->inst.feedback_connection[0] = data[CONNECTION];
264
265 if (type == FM_PATCH_OPL3) {
266 for (i = 0; i < 2; i++) {
267 patch->inst.op[i+2].am_vib =
268 data[OFFSET_4OP + AM_VIB + i];
269 patch->inst.op[i+2].ksl_level =
270 data[OFFSET_4OP + KSL_LEVEL + i];
271 patch->inst.op[i+2].attack_decay =
272 data[OFFSET_4OP + ATTACK_DECAY + i];
273 patch->inst.op[i+2].sustain_release =
274 data[OFFSET_4OP + SUSTAIN_RELEASE + i];
275 patch->inst.op[i+2].wave_select =
276 data[OFFSET_4OP + WAVE_SELECT + i];
277 }
278 patch->inst.feedback_connection[1] =
279 data[OFFSET_4OP + CONNECTION];
280 }
281
282 if (ext) {
283 patch->inst.echo_delay = ext[0];
284 patch->inst.echo_atten = ext[1];
285 patch->inst.chorus_spread = ext[2];
286 patch->inst.trnsps = ext[3];
287 patch->inst.fix_dur = ext[4];
288 patch->inst.modes = ext[5];
289 patch->inst.fix_key = ext[6];
290 }
291
292 if (name)
293 strscpy(patch->name, name, sizeof(patch->name));
294
295 return 0;
296 }
297 EXPORT_SYMBOL(snd_opl3_load_patch);
298
299 /*
300 * find a patch with the given program and bank numbers, returns its pointer
301 * if no matching patch is found and create_patch is set, it creates a
302 * new patch object.
303 */
snd_opl3_find_patch(struct snd_opl3 * opl3,int prog,int bank,int create_patch)304 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
305 int create_patch)
306 {
307 /* pretty dumb hash key */
308 unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
309 struct fm_patch *patch;
310
311 for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
312 if (patch->prog == prog && patch->bank == bank)
313 return patch;
314 }
315 if (!create_patch)
316 return NULL;
317
318 patch = kzalloc(sizeof(*patch), GFP_KERNEL);
319 if (!patch)
320 return NULL;
321 patch->prog = prog;
322 patch->bank = bank;
323 patch->next = opl3->patch_table[key];
324 opl3->patch_table[key] = patch;
325 return patch;
326 }
327 EXPORT_SYMBOL(snd_opl3_find_patch);
328
329 /*
330 * Clear all patches of the given OPL3 instance
331 */
snd_opl3_clear_patches(struct snd_opl3 * opl3)332 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
333 {
334 int i;
335 for (i = 0; i < OPL3_PATCH_HASH_SIZE; i++) {
336 struct fm_patch *patch, *next;
337 for (patch = opl3->patch_table[i]; patch; patch = next) {
338 next = patch->next;
339 kfree(patch);
340 }
341 }
342 memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
343 }
344 #endif /* OPL3_SUPPORT_SYNTH */
345
346 /* ------------------------------ */
347
snd_opl3_reset(struct snd_opl3 * opl3)348 void snd_opl3_reset(struct snd_opl3 * opl3)
349 {
350 unsigned short opl3_reg;
351
352 unsigned short reg_side;
353 unsigned char voice_offset;
354
355 int max_voices, i;
356
357 max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
358 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
359
360 for (i = 0; i < max_voices; i++) {
361 /* Get register array side and offset of voice */
362 if (i < MAX_OPL2_VOICES) {
363 /* Left register block for voices 0 .. 8 */
364 reg_side = OPL3_LEFT;
365 voice_offset = i;
366 } else {
367 /* Right register block for voices 9 .. 17 */
368 reg_side = OPL3_RIGHT;
369 voice_offset = i - MAX_OPL2_VOICES;
370 }
371 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
372 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
373 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
374 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */
375
376 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
377 opl3->command(opl3, opl3_reg, 0x00); /* Note off */
378 }
379
380 opl3->max_voices = MAX_OPL2_VOICES;
381 opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;
382
383 opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
384 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00); /* Melodic mode */
385 opl3->rhythm = 0;
386 }
387
388 EXPORT_SYMBOL(snd_opl3_reset);
389
snd_opl3_play_note(struct snd_opl3 * opl3,struct snd_dm_fm_note * note)390 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
391 {
392 unsigned short reg_side;
393 unsigned char voice_offset;
394
395 unsigned short opl3_reg;
396 unsigned char reg_val;
397
398 /* Voices 0 - 8 in OPL2 mode */
399 /* Voices 0 - 17 in OPL3 mode */
400 if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
401 MAX_OPL3_VOICES : MAX_OPL2_VOICES))
402 return -EINVAL;
403
404 /* Get register array side and offset of voice */
405 if (note->voice < MAX_OPL2_VOICES) {
406 /* Left register block for voices 0 .. 8 */
407 reg_side = OPL3_LEFT;
408 voice_offset = note->voice;
409 } else {
410 /* Right register block for voices 9 .. 17 */
411 reg_side = OPL3_RIGHT;
412 voice_offset = note->voice - MAX_OPL2_VOICES;
413 }
414
415 /* Set lower 8 bits of note frequency */
416 reg_val = (unsigned char) note->fnum;
417 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
418 opl3->command(opl3, opl3_reg, reg_val);
419
420 reg_val = 0x00;
421 /* Set output sound flag */
422 if (note->key_on)
423 reg_val |= OPL3_KEYON_BIT;
424 /* Set octave */
425 reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
426 /* Set higher 2 bits of note frequency */
427 reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;
428
429 /* Set OPL3 KEYON_BLOCK register of requested voice */
430 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
431 opl3->command(opl3, opl3_reg, reg_val);
432
433 return 0;
434 }
435
436
snd_opl3_set_voice(struct snd_opl3 * opl3,struct snd_dm_fm_voice * voice)437 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
438 {
439 unsigned short reg_side;
440 unsigned char op_offset;
441 unsigned char voice_offset, voice_op;
442
443 unsigned short opl3_reg;
444 unsigned char reg_val;
445
446 /* Only operators 1 and 2 */
447 if (voice->op > 1)
448 return -EINVAL;
449 /* Voices 0 - 8 in OPL2 mode */
450 /* Voices 0 - 17 in OPL3 mode */
451 if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
452 MAX_OPL3_VOICES : MAX_OPL2_VOICES))
453 return -EINVAL;
454
455 /* Get register array side and offset of voice */
456 if (voice->voice < MAX_OPL2_VOICES) {
457 /* Left register block for voices 0 .. 8 */
458 reg_side = OPL3_LEFT;
459 voice_offset = voice->voice;
460 } else {
461 /* Right register block for voices 9 .. 17 */
462 reg_side = OPL3_RIGHT;
463 voice_offset = voice->voice - MAX_OPL2_VOICES;
464 }
465 /* Get register offset of operator */
466 voice_offset = array_index_nospec(voice_offset, MAX_OPL2_VOICES);
467 voice_op = array_index_nospec(voice->op, 4);
468 op_offset = snd_opl3_regmap[voice_offset][voice_op];
469
470 reg_val = 0x00;
471 /* Set amplitude modulation (tremolo) effect */
472 if (voice->am)
473 reg_val |= OPL3_TREMOLO_ON;
474 /* Set vibrato effect */
475 if (voice->vibrato)
476 reg_val |= OPL3_VIBRATO_ON;
477 /* Set sustaining sound phase */
478 if (voice->do_sustain)
479 reg_val |= OPL3_SUSTAIN_ON;
480 /* Set keyboard scaling bit */
481 if (voice->kbd_scale)
482 reg_val |= OPL3_KSR;
483 /* Set harmonic or frequency multiplier */
484 reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;
485
486 /* Set OPL3 AM_VIB register of requested voice/operator */
487 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
488 opl3->command(opl3, opl3_reg, reg_val);
489
490 /* Set decreasing volume of higher notes */
491 reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
492 /* Set output volume */
493 reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;
494
495 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
496 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
497 opl3->command(opl3, opl3_reg, reg_val);
498
499 /* Set attack phase level */
500 reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
501 /* Set decay phase level */
502 reg_val |= voice->decay & OPL3_DECAY_MASK;
503
504 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
505 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
506 opl3->command(opl3, opl3_reg, reg_val);
507
508 /* Set sustain phase level */
509 reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
510 /* Set release phase level */
511 reg_val |= voice->release & OPL3_RELEASE_MASK;
512
513 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
514 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
515 opl3->command(opl3, opl3_reg, reg_val);
516
517 /* Set inter-operator feedback */
518 reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
519 /* Set inter-operator connection */
520 if (voice->connection)
521 reg_val |= OPL3_CONNECTION_BIT;
522 /* OPL-3 only */
523 if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
524 if (voice->left)
525 reg_val |= OPL3_VOICE_TO_LEFT;
526 if (voice->right)
527 reg_val |= OPL3_VOICE_TO_RIGHT;
528 }
529 /* Feedback/connection bits are applicable to voice */
530 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
531 opl3->command(opl3, opl3_reg, reg_val);
532
533 /* Select waveform */
534 reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
535 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
536 opl3->command(opl3, opl3_reg, reg_val);
537
538 return 0;
539 }
540
snd_opl3_set_params(struct snd_opl3 * opl3,struct snd_dm_fm_params * params)541 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
542 {
543 unsigned char reg_val;
544
545 reg_val = 0x00;
546 /* Set keyboard split method */
547 if (params->kbd_split)
548 reg_val |= OPL3_KEYBOARD_SPLIT;
549 opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);
550
551 reg_val = 0x00;
552 /* Set amplitude modulation (tremolo) depth */
553 if (params->am_depth)
554 reg_val |= OPL3_TREMOLO_DEPTH;
555 /* Set vibrato depth */
556 if (params->vib_depth)
557 reg_val |= OPL3_VIBRATO_DEPTH;
558 /* Set percussion mode */
559 if (params->rhythm) {
560 reg_val |= OPL3_PERCUSSION_ENABLE;
561 opl3->rhythm = 1;
562 } else {
563 opl3->rhythm = 0;
564 }
565 /* Play percussion instruments */
566 if (params->bass)
567 reg_val |= OPL3_BASSDRUM_ON;
568 if (params->snare)
569 reg_val |= OPL3_SNAREDRUM_ON;
570 if (params->tomtom)
571 reg_val |= OPL3_TOMTOM_ON;
572 if (params->cymbal)
573 reg_val |= OPL3_CYMBAL_ON;
574 if (params->hihat)
575 reg_val |= OPL3_HIHAT_ON;
576
577 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
578 return 0;
579 }
580
snd_opl3_set_mode(struct snd_opl3 * opl3,int mode)581 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
582 {
583 if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
584 return -EINVAL;
585
586 opl3->fm_mode = mode;
587 if (opl3->hardware >= OPL3_HW_OPL3)
588 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00); /* Clear 4-op connections */
589
590 return 0;
591 }
592
snd_opl3_set_connection(struct snd_opl3 * opl3,int connection)593 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
594 {
595 unsigned char reg_val;
596
597 /* OPL-3 only */
598 if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
599 return -EINVAL;
600
601 reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
602 OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
603 /* Set 4-op connections */
604 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);
605
606 return 0;
607 }
608
609