1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) by Uros Bizjak <uros@kss-loka.si> 4 * 5 * Midi synth routines for OPL2/OPL3/OPL4 FM 6 */ 7 8 #undef DEBUG_ALLOC 9 #undef DEBUG_MIDI 10 11 #include "opl3_voice.h" 12 #include <sound/asoundef.h> 13 14 #ifdef DEBUG_MIDI 15 #define opl3_dbg(opl3, fmt, ...) \ 16 dev_dbg(((struct snd_opl3 *)(opl3))->card->dev, fmt, ##__VA_ARGS__) 17 #else 18 #define opl3_dbg(opl3, fmt, ...) do {} while (0) 19 #endif 20 21 static void snd_opl3_note_off_unsafe(void *p, int note, int vel, 22 struct snd_midi_channel *chan); 23 /* 24 * The next table looks magical, but it certainly is not. Its values have 25 * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception 26 * for i=0. This log-table converts a linear volume-scaling (0..127) to a 27 * logarithmic scaling as present in the FM-synthesizer chips. so : Volume 28 * 64 = 0 db = relative volume 0 and: Volume 32 = -6 db = relative 29 * volume -8 it was implemented as a table because it is only 128 bytes and 30 * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>) 31 */ 32 33 static const char opl3_volume_table[128] = 34 { 35 -63, -48, -40, -35, -32, -29, -27, -26, 36 -24, -23, -21, -20, -19, -18, -18, -17, 37 -16, -15, -15, -14, -13, -13, -12, -12, 38 -11, -11, -10, -10, -10, -9, -9, -8, 39 -8, -8, -7, -7, -7, -6, -6, -6, 40 -5, -5, -5, -5, -4, -4, -4, -4, 41 -3, -3, -3, -3, -2, -2, -2, -2, 42 -2, -1, -1, -1, -1, 0, 0, 0, 43 0, 0, 0, 1, 1, 1, 1, 1, 44 1, 2, 2, 2, 2, 2, 2, 2, 45 3, 3, 3, 3, 3, 3, 3, 4, 46 4, 4, 4, 4, 4, 4, 4, 5, 47 5, 5, 5, 5, 5, 5, 5, 5, 48 6, 6, 6, 6, 6, 6, 6, 6, 49 6, 7, 7, 7, 7, 7, 7, 7, 50 7, 7, 7, 8, 8, 8, 8, 8 51 }; 52 53 void snd_opl3_calc_volume(unsigned char *volbyte, int vel, 54 struct snd_midi_channel *chan) 55 { 56 int oldvol, newvol, n; 57 int volume; 58 59 volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127); 60 if (volume > 127) 61 volume = 127; 62 63 oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK); 64 65 newvol = opl3_volume_table[volume] + oldvol; 66 if (newvol > OPL3_TOTAL_LEVEL_MASK) 67 newvol = OPL3_TOTAL_LEVEL_MASK; 68 else if (newvol < 0) 69 newvol = 0; 70 71 n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK); 72 73 *volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK); 74 } 75 76 /* 77 * Converts the note frequency to block and fnum values for the FM chip 78 */ 79 static const short opl3_note_table[16] = 80 { 81 305, 323, /* for pitch bending, -2 semitones */ 82 343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647, 83 686, 726 /* for pitch bending, +2 semitones */ 84 }; 85 86 static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum, 87 int note, struct snd_midi_channel *chan) 88 { 89 int block = ((note / 12) & 0x07) - 1; 90 int idx = (note % 12) + 2; 91 int freq; 92 93 if (chan->midi_pitchbend) { 94 int pitchbend = chan->midi_pitchbend; 95 int segment; 96 97 if (pitchbend < -0x2000) 98 pitchbend = -0x2000; 99 if (pitchbend > 0x1FFF) 100 pitchbend = 0x1FFF; 101 102 segment = pitchbend / 0x1000; 103 freq = opl3_note_table[idx+segment]; 104 freq += ((opl3_note_table[idx+segment+1] - freq) * 105 (pitchbend % 0x1000)) / 0x1000; 106 } else { 107 freq = opl3_note_table[idx]; 108 } 109 110 *fnum = (unsigned char) freq; 111 *blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) | 112 ((block << 2) & OPL3_BLOCKNUM_MASK); 113 } 114 115 116 #ifdef DEBUG_ALLOC 117 static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) 118 { 119 int i; 120 const char *str = "x.24"; 121 char buf[MAX_OPL3_VOICES + 1]; 122 123 for (i = 0; i < opl3->max_voices; i++) 124 buf[i] = str[opl3->voices[i].state + 1]; 125 buf[i] = 0; 126 dev_dbg(opl3->card->dev, "time %.5i: %s [%.2i]: %s\n", 127 opl3->use_time, s, voice, buf); 128 } 129 #endif 130 131 /* 132 * Get a FM voice (channel) to play a note on. 133 */ 134 static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op, 135 struct snd_midi_channel *chan) { 136 int chan_4op_1; /* first voice for 4op instrument */ 137 int chan_4op_2; /* second voice for 4op instrument */ 138 139 struct snd_opl3_voice *vp, *vp2; 140 unsigned int voice_time; 141 int i; 142 143 #ifdef DEBUG_ALLOC 144 char *alloc_type[3] = { "FREE ", "CHEAP ", "EXPENSIVE" }; 145 #endif 146 147 /* This is our "allocation cost" table */ 148 enum { 149 FREE = 0, CHEAP, EXPENSIVE, END 150 }; 151 152 /* Keeps track of what we are finding */ 153 struct best { 154 unsigned int time; 155 int voice; 156 } best[END]; 157 struct best *bp; 158 159 for (i = 0; i < END; i++) { 160 best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */ 161 best[i].voice = -1; 162 } 163 164 /* Look through all the channels for the most suitable. */ 165 for (i = 0; i < opl3->max_voices; i++) { 166 vp = &opl3->voices[i]; 167 168 if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL) 169 /* skip unavailable channels, allocated by 170 drum voices or by bounded 4op voices) */ 171 continue; 172 173 voice_time = vp->time; 174 bp = best; 175 176 chan_4op_1 = ((i < 3) || (i > 8 && i < 12)); 177 chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15)); 178 if (instr_4op) { 179 /* allocate 4op voice */ 180 /* skip channels unavailable to 4op instrument */ 181 if (!chan_4op_1) 182 continue; 183 184 if (vp->state) 185 /* kill one voice, CHEAP */ 186 bp++; 187 /* get state of bounded 2op channel 188 to be allocated for 4op instrument */ 189 vp2 = &opl3->voices[i + 3]; 190 if (vp2->state == SNDRV_OPL3_ST_ON_2OP) { 191 /* kill two voices, EXPENSIVE */ 192 bp++; 193 voice_time = max(voice_time, vp2->time); 194 } 195 } else { 196 /* allocate 2op voice */ 197 if ((chan_4op_1) || (chan_4op_2)) 198 /* use bounded channels for 2op, CHEAP */ 199 bp++; 200 else if (vp->state) 201 /* kill one voice on 2op channel, CHEAP */ 202 bp++; 203 /* raise kill cost to EXPENSIVE for all channels */ 204 if (vp->state) 205 bp++; 206 } 207 if (voice_time < bp->time) { 208 bp->time = voice_time; 209 bp->voice = i; 210 } 211 } 212 213 for (i = 0; i < END; i++) { 214 if (best[i].voice >= 0) { 215 #ifdef DEBUG_ALLOC 216 dev_dbg(opl3->card->dev, 217 "%s %iop allocation on voice %i\n", 218 alloc_type[i], instr_4op ? 4 : 2, 219 best[i].voice); 220 #endif 221 return best[i].voice; 222 } 223 } 224 /* not found */ 225 return -1; 226 } 227 228 /* ------------------------------ */ 229 230 /* 231 * System timer interrupt function 232 */ 233 void snd_opl3_timer_func(struct timer_list *t) 234 { 235 236 struct snd_opl3 *opl3 = from_timer(opl3, t, tlist); 237 unsigned long flags; 238 int again = 0; 239 int i; 240 241 spin_lock_irqsave(&opl3->voice_lock, flags); 242 for (i = 0; i < opl3->max_voices; i++) { 243 struct snd_opl3_voice *vp = &opl3->voices[i]; 244 if (vp->state > 0 && vp->note_off_check) { 245 if (vp->note_off == jiffies) 246 snd_opl3_note_off_unsafe(opl3, vp->note, 0, 247 vp->chan); 248 else 249 again++; 250 } 251 } 252 spin_unlock_irqrestore(&opl3->voice_lock, flags); 253 254 spin_lock_irqsave(&opl3->sys_timer_lock, flags); 255 if (again) 256 mod_timer(&opl3->tlist, jiffies + 1); /* invoke again */ 257 else 258 opl3->sys_timer_status = 0; 259 spin_unlock_irqrestore(&opl3->sys_timer_lock, flags); 260 } 261 262 /* 263 * Start system timer 264 */ 265 static void snd_opl3_start_timer(struct snd_opl3 *opl3) 266 { 267 unsigned long flags; 268 spin_lock_irqsave(&opl3->sys_timer_lock, flags); 269 if (! opl3->sys_timer_status) { 270 mod_timer(&opl3->tlist, jiffies + 1); 271 opl3->sys_timer_status = 1; 272 } 273 spin_unlock_irqrestore(&opl3->sys_timer_lock, flags); 274 } 275 276 /* ------------------------------ */ 277 278 279 static const int snd_opl3_oss_map[MAX_OPL3_VOICES] = { 280 0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14 281 }; 282 283 /* 284 * Start a note. 285 */ 286 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan) 287 { 288 struct snd_opl3 *opl3; 289 int instr_4op; 290 291 int voice; 292 struct snd_opl3_voice *vp, *vp2; 293 unsigned short connect_mask; 294 unsigned char connection; 295 unsigned char vol_op[4]; 296 297 int extra_prg = 0; 298 299 unsigned short reg_side; 300 unsigned char op_offset; 301 unsigned char voice_offset; 302 unsigned short opl3_reg; 303 unsigned char reg_val; 304 unsigned char prg, bank; 305 306 int key = note; 307 unsigned char fnum, blocknum; 308 int i; 309 310 struct fm_patch *patch; 311 struct fm_instrument *fm; 312 unsigned long flags; 313 314 opl3 = p; 315 316 opl3_dbg(opl3, "Note on, ch %i, inst %i, note %i, vel %i\n", 317 chan->number, chan->midi_program, note, vel); 318 319 /* in SYNTH mode, application takes care of voices */ 320 /* in SEQ mode, drum voice numbers are notes on drum channel */ 321 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) { 322 if (chan->drum_channel) { 323 /* percussion instruments are located in bank 128 */ 324 bank = 128; 325 prg = note; 326 } else { 327 bank = chan->gm_bank_select; 328 prg = chan->midi_program; 329 } 330 } else { 331 /* Prepare for OSS mode */ 332 if (chan->number >= MAX_OPL3_VOICES) 333 return; 334 335 /* OSS instruments are located in bank 127 */ 336 bank = 127; 337 prg = chan->midi_program; 338 } 339 340 spin_lock_irqsave(&opl3->voice_lock, flags); 341 342 if (use_internal_drums) { 343 snd_opl3_drum_switch(opl3, note, vel, 1, chan); 344 spin_unlock_irqrestore(&opl3->voice_lock, flags); 345 return; 346 } 347 348 __extra_prg: 349 patch = snd_opl3_find_patch(opl3, prg, bank, 0); 350 if (!patch) { 351 spin_unlock_irqrestore(&opl3->voice_lock, flags); 352 return; 353 } 354 355 fm = &patch->inst; 356 switch (patch->type) { 357 case FM_PATCH_OPL2: 358 instr_4op = 0; 359 break; 360 case FM_PATCH_OPL3: 361 if (opl3->hardware >= OPL3_HW_OPL3) { 362 instr_4op = 1; 363 break; 364 } 365 fallthrough; 366 default: 367 spin_unlock_irqrestore(&opl3->voice_lock, flags); 368 return; 369 } 370 opl3_dbg(opl3, " --> OPL%i instrument: %s\n", 371 instr_4op ? 3 : 2, patch->name); 372 /* in SYNTH mode, application takes care of voices */ 373 /* in SEQ mode, allocate voice on free OPL3 channel */ 374 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) { 375 voice = opl3_get_voice(opl3, instr_4op, chan); 376 } else { 377 /* remap OSS voice */ 378 voice = snd_opl3_oss_map[chan->number]; 379 } 380 381 if (voice < 0) { 382 spin_unlock_irqrestore(&opl3->voice_lock, flags); 383 return; 384 } 385 386 if (voice < MAX_OPL2_VOICES) { 387 /* Left register block for voices 0 .. 8 */ 388 reg_side = OPL3_LEFT; 389 voice_offset = voice; 390 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07; 391 } else { 392 /* Right register block for voices 9 .. 17 */ 393 reg_side = OPL3_RIGHT; 394 voice_offset = voice - MAX_OPL2_VOICES; 395 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38; 396 } 397 398 /* kill voice on channel */ 399 vp = &opl3->voices[voice]; 400 if (vp->state > 0) { 401 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset); 402 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT; 403 opl3->command(opl3, opl3_reg, reg_val); 404 } 405 if (instr_4op) { 406 vp2 = &opl3->voices[voice + 3]; 407 if (vp2->state > 0) { 408 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + 409 voice_offset + 3); 410 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT; 411 opl3->command(opl3, opl3_reg, reg_val); 412 } 413 } 414 415 /* set connection register */ 416 if (instr_4op) { 417 if ((opl3->connection_reg ^ connect_mask) & connect_mask) { 418 opl3->connection_reg |= connect_mask; 419 /* set connection bit */ 420 opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT; 421 opl3->command(opl3, opl3_reg, opl3->connection_reg); 422 } 423 } else { 424 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) { 425 opl3->connection_reg &= ~connect_mask; 426 /* clear connection bit */ 427 opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT; 428 opl3->command(opl3, opl3_reg, opl3->connection_reg); 429 } 430 } 431 432 opl3_dbg(opl3, " --> setting OPL3 connection: 0x%x\n", 433 opl3->connection_reg); 434 /* 435 * calculate volume depending on connection 436 * between FM operators (see include/opl3.h) 437 */ 438 for (i = 0; i < (instr_4op ? 4 : 2); i++) 439 vol_op[i] = fm->op[i].ksl_level; 440 441 connection = fm->feedback_connection[0] & 0x01; 442 if (instr_4op) { 443 connection <<= 1; 444 connection |= fm->feedback_connection[1] & 0x01; 445 446 snd_opl3_calc_volume(&vol_op[3], vel, chan); 447 switch (connection) { 448 case 0x03: 449 snd_opl3_calc_volume(&vol_op[2], vel, chan); 450 fallthrough; 451 case 0x02: 452 snd_opl3_calc_volume(&vol_op[0], vel, chan); 453 break; 454 case 0x01: 455 snd_opl3_calc_volume(&vol_op[1], vel, chan); 456 } 457 } else { 458 snd_opl3_calc_volume(&vol_op[1], vel, chan); 459 if (connection) 460 snd_opl3_calc_volume(&vol_op[0], vel, chan); 461 } 462 463 /* Program the FM voice characteristics */ 464 for (i = 0; i < (instr_4op ? 4 : 2); i++) { 465 opl3_dbg(opl3, " --> programming operator %i\n", i); 466 op_offset = snd_opl3_regmap[voice_offset][i]; 467 468 /* Set OPL3 AM_VIB register of requested voice/operator */ 469 reg_val = fm->op[i].am_vib; 470 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset); 471 opl3->command(opl3, opl3_reg, reg_val); 472 473 /* Set OPL3 KSL_LEVEL register of requested voice/operator */ 474 reg_val = vol_op[i]; 475 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset); 476 opl3->command(opl3, opl3_reg, reg_val); 477 478 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */ 479 reg_val = fm->op[i].attack_decay; 480 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset); 481 opl3->command(opl3, opl3_reg, reg_val); 482 483 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */ 484 reg_val = fm->op[i].sustain_release; 485 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset); 486 opl3->command(opl3, opl3_reg, reg_val); 487 488 /* Select waveform */ 489 reg_val = fm->op[i].wave_select; 490 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset); 491 opl3->command(opl3, opl3_reg, reg_val); 492 } 493 494 /* Set operator feedback and 2op inter-operator connection */ 495 reg_val = fm->feedback_connection[0]; 496 /* Set output voice connection */ 497 reg_val |= OPL3_STEREO_BITS; 498 if (chan->gm_pan < 43) 499 reg_val &= ~OPL3_VOICE_TO_RIGHT; 500 if (chan->gm_pan > 85) 501 reg_val &= ~OPL3_VOICE_TO_LEFT; 502 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset); 503 opl3->command(opl3, opl3_reg, reg_val); 504 505 if (instr_4op) { 506 /* Set 4op inter-operator connection */ 507 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT; 508 /* Set output voice connection */ 509 reg_val |= OPL3_STEREO_BITS; 510 if (chan->gm_pan < 43) 511 reg_val &= ~OPL3_VOICE_TO_RIGHT; 512 if (chan->gm_pan > 85) 513 reg_val &= ~OPL3_VOICE_TO_LEFT; 514 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + 515 voice_offset + 3); 516 opl3->command(opl3, opl3_reg, reg_val); 517 } 518 519 /* 520 * Special treatment of percussion notes for fm: 521 * Requested pitch is really program, and pitch for 522 * device is whatever was specified in the patch library. 523 */ 524 if (fm->fix_key) 525 note = fm->fix_key; 526 /* 527 * use transpose if defined in patch library 528 */ 529 if (fm->trnsps) 530 note += (fm->trnsps - 64); 531 532 snd_opl3_calc_pitch(&fnum, &blocknum, note, chan); 533 534 /* Set OPL3 FNUM_LOW register of requested voice */ 535 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset); 536 opl3->command(opl3, opl3_reg, fnum); 537 538 opl3->voices[voice].keyon_reg = blocknum; 539 540 /* Set output sound flag */ 541 blocknum |= OPL3_KEYON_BIT; 542 543 opl3_dbg(opl3, " --> trigger voice %i\n", voice); 544 /* Set OPL3 KEYON_BLOCK register of requested voice */ 545 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset); 546 opl3->command(opl3, opl3_reg, blocknum); 547 548 /* kill note after fixed duration (in centiseconds) */ 549 if (fm->fix_dur) { 550 opl3->voices[voice].note_off = jiffies + 551 (fm->fix_dur * HZ) / 100; 552 snd_opl3_start_timer(opl3); 553 opl3->voices[voice].note_off_check = 1; 554 } else 555 opl3->voices[voice].note_off_check = 0; 556 557 /* get extra pgm, but avoid possible loops */ 558 extra_prg = (extra_prg) ? 0 : fm->modes; 559 560 /* do the bookkeeping */ 561 vp->time = opl3->use_time++; 562 vp->note = key; 563 vp->chan = chan; 564 565 if (instr_4op) { 566 vp->state = SNDRV_OPL3_ST_ON_4OP; 567 568 vp2 = &opl3->voices[voice + 3]; 569 vp2->time = opl3->use_time++; 570 vp2->note = key; 571 vp2->chan = chan; 572 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL; 573 } else { 574 if (vp->state == SNDRV_OPL3_ST_ON_4OP) { 575 /* 4op killed by 2op, release bounded voice */ 576 vp2 = &opl3->voices[voice + 3]; 577 vp2->time = opl3->use_time++; 578 vp2->state = SNDRV_OPL3_ST_OFF; 579 } 580 vp->state = SNDRV_OPL3_ST_ON_2OP; 581 } 582 583 #ifdef DEBUG_ALLOC 584 debug_alloc(opl3, "note on ", voice); 585 #endif 586 587 /* allocate extra program if specified in patch library */ 588 if (extra_prg) { 589 if (extra_prg > 128) { 590 bank = 128; 591 /* percussions start at 35 */ 592 prg = extra_prg - 128 + 35 - 1; 593 } else { 594 bank = 0; 595 prg = extra_prg - 1; 596 } 597 opl3_dbg(opl3, " *** allocating extra program\n"); 598 goto __extra_prg; 599 } 600 spin_unlock_irqrestore(&opl3->voice_lock, flags); 601 } 602 603 static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice) 604 { 605 unsigned short reg_side; 606 unsigned char voice_offset; 607 unsigned short opl3_reg; 608 609 struct snd_opl3_voice *vp, *vp2; 610 611 if (snd_BUG_ON(voice >= MAX_OPL3_VOICES)) 612 return; 613 614 vp = &opl3->voices[voice]; 615 if (voice < MAX_OPL2_VOICES) { 616 /* Left register block for voices 0 .. 8 */ 617 reg_side = OPL3_LEFT; 618 voice_offset = voice; 619 } else { 620 /* Right register block for voices 9 .. 17 */ 621 reg_side = OPL3_RIGHT; 622 voice_offset = voice - MAX_OPL2_VOICES; 623 } 624 625 /* kill voice */ 626 opl3_dbg(opl3, " --> kill voice %i\n", voice); 627 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset); 628 /* clear Key ON bit */ 629 opl3->command(opl3, opl3_reg, vp->keyon_reg); 630 631 /* do the bookkeeping */ 632 vp->time = opl3->use_time++; 633 634 if (vp->state == SNDRV_OPL3_ST_ON_4OP) { 635 vp2 = &opl3->voices[voice + 3]; 636 637 vp2->time = opl3->use_time++; 638 vp2->state = SNDRV_OPL3_ST_OFF; 639 } 640 vp->state = SNDRV_OPL3_ST_OFF; 641 #ifdef DEBUG_ALLOC 642 debug_alloc(opl3, "note off", voice); 643 #endif 644 645 } 646 647 /* 648 * Release a note in response to a midi note off. 649 */ 650 static void snd_opl3_note_off_unsafe(void *p, int note, int vel, 651 struct snd_midi_channel *chan) 652 { 653 struct snd_opl3 *opl3; 654 655 int voice; 656 struct snd_opl3_voice *vp; 657 658 opl3 = p; 659 660 opl3_dbg(opl3, "Note off, ch %i, inst %i, note %i\n", 661 chan->number, chan->midi_program, note); 662 663 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) { 664 if (chan->drum_channel && use_internal_drums) { 665 snd_opl3_drum_switch(opl3, note, vel, 0, chan); 666 return; 667 } 668 /* this loop will hopefully kill all extra voices, because 669 they are grouped by the same channel and note values */ 670 for (voice = 0; voice < opl3->max_voices; voice++) { 671 vp = &opl3->voices[voice]; 672 if (vp->state > 0 && vp->chan == chan && vp->note == note) { 673 snd_opl3_kill_voice(opl3, voice); 674 } 675 } 676 } else { 677 /* remap OSS voices */ 678 if (chan->number < MAX_OPL3_VOICES) { 679 voice = snd_opl3_oss_map[chan->number]; 680 snd_opl3_kill_voice(opl3, voice); 681 } 682 } 683 } 684 685 void snd_opl3_note_off(void *p, int note, int vel, 686 struct snd_midi_channel *chan) 687 { 688 struct snd_opl3 *opl3 = p; 689 unsigned long flags; 690 691 spin_lock_irqsave(&opl3->voice_lock, flags); 692 snd_opl3_note_off_unsafe(p, note, vel, chan); 693 spin_unlock_irqrestore(&opl3->voice_lock, flags); 694 } 695 696 /* 697 * key pressure change 698 */ 699 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan) 700 { 701 opl3_dbg(p, "Key pressure, ch#: %i, inst#: %i\n", 702 chan->number, chan->midi_program); 703 } 704 705 /* 706 * terminate note 707 */ 708 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan) 709 { 710 opl3_dbg(p, "Terminate note, ch#: %i, inst#: %i\n", 711 chan->number, chan->midi_program); 712 } 713 714 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice) 715 { 716 unsigned short reg_side; 717 unsigned char voice_offset; 718 unsigned short opl3_reg; 719 720 unsigned char fnum, blocknum; 721 722 struct snd_opl3_voice *vp; 723 724 if (snd_BUG_ON(voice >= MAX_OPL3_VOICES)) 725 return; 726 727 vp = &opl3->voices[voice]; 728 if (vp->chan == NULL) 729 return; /* not allocated? */ 730 731 if (voice < MAX_OPL2_VOICES) { 732 /* Left register block for voices 0 .. 8 */ 733 reg_side = OPL3_LEFT; 734 voice_offset = voice; 735 } else { 736 /* Right register block for voices 9 .. 17 */ 737 reg_side = OPL3_RIGHT; 738 voice_offset = voice - MAX_OPL2_VOICES; 739 } 740 741 snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan); 742 743 /* Set OPL3 FNUM_LOW register of requested voice */ 744 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset); 745 opl3->command(opl3, opl3_reg, fnum); 746 747 vp->keyon_reg = blocknum; 748 749 /* Set output sound flag */ 750 blocknum |= OPL3_KEYON_BIT; 751 752 /* Set OPL3 KEYON_BLOCK register of requested voice */ 753 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset); 754 opl3->command(opl3, opl3_reg, blocknum); 755 756 vp->time = opl3->use_time++; 757 } 758 759 /* 760 * Update voice pitch controller 761 */ 762 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan) 763 { 764 int voice; 765 struct snd_opl3_voice *vp; 766 767 unsigned long flags; 768 769 spin_lock_irqsave(&opl3->voice_lock, flags); 770 771 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) { 772 for (voice = 0; voice < opl3->max_voices; voice++) { 773 vp = &opl3->voices[voice]; 774 if (vp->state > 0 && vp->chan == chan) { 775 snd_opl3_update_pitch(opl3, voice); 776 } 777 } 778 } else { 779 /* remap OSS voices */ 780 if (chan->number < MAX_OPL3_VOICES) { 781 voice = snd_opl3_oss_map[chan->number]; 782 snd_opl3_update_pitch(opl3, voice); 783 } 784 } 785 spin_unlock_irqrestore(&opl3->voice_lock, flags); 786 } 787 788 /* 789 * Deal with a controller type event. This includes all types of 790 * control events, not just the midi controllers 791 */ 792 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan) 793 { 794 struct snd_opl3 *opl3; 795 796 opl3 = p; 797 opl3_dbg(opl3, "Controller, TYPE = %i, ch#: %i, inst#: %i\n", 798 type, chan->number, chan->midi_program); 799 800 switch (type) { 801 case MIDI_CTL_MSB_MODWHEEL: 802 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63) 803 opl3->drum_reg |= OPL3_VIBRATO_DEPTH; 804 else 805 opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH; 806 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 807 opl3->drum_reg); 808 break; 809 case MIDI_CTL_E2_TREMOLO_DEPTH: 810 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63) 811 opl3->drum_reg |= OPL3_TREMOLO_DEPTH; 812 else 813 opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH; 814 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 815 opl3->drum_reg); 816 break; 817 case MIDI_CTL_PITCHBEND: 818 snd_opl3_pitch_ctrl(opl3, chan); 819 break; 820 } 821 } 822 823 /* 824 * NRPN events 825 */ 826 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan, 827 struct snd_midi_channel_set *chset) 828 { 829 opl3_dbg(p, "NRPN, ch#: %i, inst#: %i\n", 830 chan->number, chan->midi_program); 831 } 832 833 /* 834 * receive sysex 835 */ 836 void snd_opl3_sysex(void *p, unsigned char *buf, int len, 837 int parsed, struct snd_midi_channel_set *chset) 838 { 839 opl3_dbg(p, "SYSEX\n"); 840 } 841