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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 /* ------------------------------ */ 357 358 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); 399 400 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 } 445 446 447 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 } 548 549 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 } 588 589 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 } 600 601 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