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