sound/drivers/opl3/opl3_midi.c

   1 /*
   2  *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
   3  *
   4  *  Midi synth routines for OPL2/OPL3/OPL4 FM
   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 #undef DEBUG_ALLOC
  23 #undef DEBUG_MIDI
  24
  25 #include "opl3_voice.h"
  26 #include <sound/asoundef.h>
  27
  28 extern char snd_opl3_regmap[MAX_OPL2_VOICES][4];
  29
  30 extern bool use_internal_drums;
  31
  32 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
  33                                      struct snd_midi_channel *chan);
  34 /*
  35  * The next table looks magical, but it certainly is not. Its values have
  36  * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
  37  * for i=0. This log-table converts a linear volume-scaling (0..127) to a
  38  * logarithmic scaling as present in the FM-synthesizer chips. so :    Volume
  39  * 64 =  0 db = relative volume  0 and:    Volume 32 = -6 db = relative
  40  * volume -8 it was implemented as a table because it is only 128 bytes and
  41  * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>)
  42  */
  43
  44 static char opl3_volume_table[128] =
  45 {
  46         -63, -48, -40, -35, -32, -29, -27, -26,
  47         -24, -23, -21, -20, -19, -18, -18, -17,
  48         -16, -15, -15, -14, -13, -13, -12, -12,
  49         -11, -11, -10, -10, -10, -9, -9, -8,
  50         -8, -8, -7, -7, -7, -6, -6, -6,
  51         -5, -5, -5, -5, -4, -4, -4, -4,
  52         -3, -3, -3, -3, -2, -2, -2, -2,
  53         -2, -1, -1, -1, -1, 0, 0, 0,
  54         0, 0, 0, 1, 1, 1, 1, 1,
  55         1, 2, 2, 2, 2, 2, 2, 2,
  56         3, 3, 3, 3, 3, 3, 3, 4,
  57         4, 4, 4, 4, 4, 4, 4, 5,
  58         5, 5, 5, 5, 5, 5, 5, 5,
  59         6, 6, 6, 6, 6, 6, 6, 6,
  60         6, 7, 7, 7, 7, 7, 7, 7,
  61         7, 7, 7, 8, 8, 8, 8, 8
  62 };
  63
  64 void snd_opl3_calc_volume(unsigned char *volbyte, int vel,
  65                           struct snd_midi_channel *chan)
  66 {
  67         int oldvol, newvol, n;
  68         int volume;
  69
  70         volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127);
  71         if (volume > 127)
  72                 volume = 127;
  73
  74         oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK);
  75
  76         newvol = opl3_volume_table[volume] + oldvol;
  77         if (newvol > OPL3_TOTAL_LEVEL_MASK)
  78                 newvol = OPL3_TOTAL_LEVEL_MASK;
  79         else if (newvol < 0)
  80                 newvol = 0;
  81
  82         n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK);
  83
  84         *volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK);
  85 }
  86
  87 /*
  88  * Converts the note frequency to block and fnum values for the FM chip
  89  */
  90 static short opl3_note_table[16] =
  91 {
  92         305, 323,       /* for pitch bending, -2 semitones */
  93         343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647,
  94         686, 726        /* for pitch bending, +2 semitones */
  95 };
  96
  97 static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum,
  98                                 int note, struct snd_midi_channel *chan)
  99 {
 100         int block = ((note / 12) & 0x07) - 1;
 101         int idx = (note % 12) + 2;
 102         int freq;
 103
 104         if (chan->midi_pitchbend) {
 105                 int pitchbend = chan->midi_pitchbend;
 106                 int segment;
 107
 108                 if (pitchbend > 0x1FFF)
 109                         pitchbend = 0x1FFF;
 110
 111                 segment = pitchbend / 0x1000;
 112                 freq = opl3_note_table[idx+segment];
 113                 freq += ((opl3_note_table[idx+segment+1] - freq) *
 114                          (pitchbend % 0x1000)) / 0x1000;
 115         } else {
 116                 freq = opl3_note_table[idx];
 117         }
 118
 119         *fnum = (unsigned char) freq;
 120         *blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) |
 121                 ((block << 2) & OPL3_BLOCKNUM_MASK);
 122 }
 123
 124
 125 #ifdef DEBUG_ALLOC
 126 static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) {
 127         int i;
 128         char *str = "x.24";
 129
 130         printk(KERN_DEBUG "time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
 131         for (i = 0; i < opl3->max_voices; i++)
 132                 printk("%c", *(str + opl3->voices[i].state + 1));
 133         printk("\n");
 134 }
 135 #endif
 136
 137 /*
 138  * Get a FM voice (channel) to play a note on.
 139  */
 140 static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op,
 141                           struct snd_midi_channel *chan) {
 142         int chan_4op_1;         /* first voice for 4op instrument */
 143         int chan_4op_2;         /* second voice for 4op instrument */
 144
 145         struct snd_opl3_voice *vp, *vp2;
 146         unsigned int voice_time;
 147         int i;
 148
 149 #ifdef DEBUG_ALLOC
 150         char *alloc_type[3] = { "FREE     ", "CHEAP    ", "EXPENSIVE" };
 151 #endif
 152
 153         /* This is our "allocation cost" table */
 154         enum {
 155                 FREE = 0, CHEAP, EXPENSIVE, END
 156         };
 157
 158         /* Keeps track of what we are finding */
 159         struct best {
 160                 unsigned int time;
 161                 int voice;
 162         } best[END];
 163         struct best *bp;
 164
 165         for (i = 0; i < END; i++) {
 166                 best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */
 167                 best[i].voice = -1;
 168         }
 169
 170         /* Look through all the channels for the most suitable. */
 171         for (i = 0; i < opl3->max_voices; i++) {
 172                 vp = &opl3->voices[i];
 173
 174                 if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL)
 175                   /* skip unavailable channels, allocated by
 176                      drum voices or by bounded 4op voices) */
 177                         continue;
 178
 179                 voice_time = vp->time;
 180                 bp = best;
 181
 182                 chan_4op_1 = ((i < 3) || (i > 8 && i < 12));
 183                 chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15));
 184                 if (instr_4op) {
 185                         /* allocate 4op voice */
 186                         /* skip channels unavailable to 4op instrument */
 187                         if (!chan_4op_1)
 188                                 continue;
 189
 190                         if (vp->state)
 191                                 /* kill one voice, CHEAP */
 192                                 bp++;
 193                         /* get state of bounded 2op channel
 194                            to be allocated for 4op instrument */
 195                         vp2 = &opl3->voices[i + 3];
 196                         if (vp2->state == SNDRV_OPL3_ST_ON_2OP) {
 197                                 /* kill two voices, EXPENSIVE */
 198                                 bp++;
 199                                 voice_time = (voice_time > vp->time) ?
 200                                         voice_time : vp->time;
 201                         }
 202                 } else {
 203                         /* allocate 2op voice */
 204                         if ((chan_4op_1) || (chan_4op_2))
 205                                 /* use bounded channels for 2op, CHEAP */
 206                                 bp++;
 207                         else if (vp->state)
 208                                 /* kill one voice on 2op channel, CHEAP */
 209                                 bp++;
 210                         /* raise kill cost to EXPENSIVE for all channels */
 211                         if (vp->state)
 212                                 bp++;
 213                 }
 214                 if (voice_time < bp->time) {
 215                         bp->time = voice_time;
 216                         bp->voice = i;
 217                 }
 218         }
 219
 220         for (i = 0; i < END; i++) {
 221                 if (best[i].voice >= 0) {
 222 #ifdef DEBUG_ALLOC
 223                         printk(KERN_DEBUG "%s %iop allocation on voice %i\n",
 224                                alloc_type[i], instr_4op ? 4 : 2,
 225                                best[i].voice);
 226 #endif
 227                         return best[i].voice;
 228                 }
 229         }
 230         /* not found */
 231         return -1;
 232 }
 233
 234 /* ------------------------------ */
 235
 236 /*
 237  * System timer interrupt function
 238  */
 239 void snd_opl3_timer_func(unsigned long data)
 240 {
 241
 242         struct snd_opl3 *opl3 = (struct snd_opl3 *)data;
 243         unsigned long flags;
 244         int again = 0;
 245         int i;
 246
 247         spin_lock_irqsave(&opl3->voice_lock, flags);
 248         for (i = 0; i < opl3->max_voices; i++) {
 249                 struct snd_opl3_voice *vp = &opl3->voices[i];
 250                 if (vp->state > 0 && vp->note_off_check) {
 251                         if (vp->note_off == jiffies)
 252                                 snd_opl3_note_off_unsafe(opl3, vp->note, 0,
 253                                                          vp->chan);
 254                         else
 255                                 again++;
 256                 }
 257         }
 258         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 259
 260         spin_lock_irqsave(&opl3->sys_timer_lock, flags);
 261         if (again)
 262                 mod_timer(&opl3->tlist, jiffies + 1);   /* invoke again */
 263         else
 264                 opl3->sys_timer_status = 0;
 265         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 266 }
 267
 268 /*
 269  * Start system timer
 270  */
 271 static void snd_opl3_start_timer(struct snd_opl3 *opl3)
 272 {
 273         unsigned long flags;
 274         spin_lock_irqsave(&opl3->sys_timer_lock, flags);
 275         if (! opl3->sys_timer_status) {
 276                 mod_timer(&opl3->tlist, jiffies + 1);
 277                 opl3->sys_timer_status = 1;
 278         }
 279         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 280 }
 281
 282 /* ------------------------------ */
 283
 284
 285 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
 286         0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
 287 };
 288
 289 /*
 290  * Start a note.
 291  */
 292 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
 293 {
 294         struct snd_opl3 *opl3;
 295         int instr_4op;
 296
 297         int voice;
 298         struct snd_opl3_voice *vp, *vp2;
 299         unsigned short connect_mask;
 300         unsigned char connection;
 301         unsigned char vol_op[4];
 302
 303         int extra_prg = 0;
 304
 305         unsigned short reg_side;
 306         unsigned char op_offset;
 307         unsigned char voice_offset;
 308         unsigned short opl3_reg;
 309         unsigned char reg_val;
 310         unsigned char prg, bank;
 311
 312         int key = note;
 313         unsigned char fnum, blocknum;
 314         int i;
 315
 316         struct fm_patch *patch;
 317         struct fm_instrument *fm;
 318         unsigned long flags;
 319
 320         opl3 = p;
 321
 322 #ifdef DEBUG_MIDI
 323         snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
 324                    chan->number, chan->midi_program, note, vel);
 325 #endif
 326
 327         /* in SYNTH mode, application takes care of voices */
 328         /* in SEQ mode, drum voice numbers are notes on drum channel */
 329         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 330                 if (chan->drum_channel) {
 331                         /* percussion instruments are located in bank 128 */
 332                         bank = 128;
 333                         prg = note;
 334                 } else {
 335                         bank = chan->gm_bank_select;
 336                         prg = chan->midi_program;
 337                 }
 338         } else {
 339                 /* Prepare for OSS mode */
 340                 if (chan->number >= MAX_OPL3_VOICES)
 341                         return;
 342
 343                 /* OSS instruments are located in bank 127 */
 344                 bank = 127;
 345                 prg = chan->midi_program;
 346         }
 347
 348         spin_lock_irqsave(&opl3->voice_lock, flags);
 349
 350         if (use_internal_drums) {
 351                 snd_opl3_drum_switch(opl3, note, vel, 1, chan);
 352                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 353                 return;
 354         }
 355
 356  __extra_prg:
 357         patch = snd_opl3_find_patch(opl3, prg, bank, 0);
 358         if (!patch) {
 359                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 360                 return;
 361         }
 362
 363         fm = &patch->inst;
 364         switch (patch->type) {
 365         case FM_PATCH_OPL2:
 366                 instr_4op = 0;
 367                 break;
 368         case FM_PATCH_OPL3:
 369                 if (opl3->hardware >= OPL3_HW_OPL3) {
 370                         instr_4op = 1;
 371                         break;
 372                 }
 373         default:
 374                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 375                 return;
 376         }
 377 #ifdef DEBUG_MIDI
 378         snd_printk(KERN_DEBUG "  --> OPL%i instrument: %s\n",
 379                    instr_4op ? 3 : 2, patch->name);
 380 #endif
 381         /* in SYNTH mode, application takes care of voices */
 382         /* in SEQ mode, allocate voice on free OPL3 channel */
 383         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 384                 voice = opl3_get_voice(opl3, instr_4op, chan);
 385         } else {
 386                 /* remap OSS voice */
 387                 voice = snd_opl3_oss_map[chan->number];
 388         }
 389
 390         if (voice < 0) {
 391                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 392                 return;
 393         }
 394
 395         if (voice < MAX_OPL2_VOICES) {
 396                 /* Left register block for voices 0 .. 8 */
 397                 reg_side = OPL3_LEFT;
 398                 voice_offset = voice;
 399                 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
 400         } else {
 401                 /* Right register block for voices 9 .. 17 */
 402                 reg_side = OPL3_RIGHT;
 403                 voice_offset = voice - MAX_OPL2_VOICES;
 404                 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
 405         }
 406
 407         /* kill voice on channel */
 408         vp = &opl3->voices[voice];
 409         if (vp->state > 0) {
 410                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 411                 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 412                 opl3->command(opl3, opl3_reg, reg_val);
 413         }
 414         if (instr_4op) {
 415                 vp2 = &opl3->voices[voice + 3];
 416                 if (vp->state > 0) {
 417                         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
 418                                                voice_offset + 3);
 419                         reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 420                         opl3->command(opl3, opl3_reg, reg_val);
 421                 }
 422         }
 423
 424         /* set connection register */
 425         if (instr_4op) {
 426                 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
 427                         opl3->connection_reg |= connect_mask;
 428                         /* set connection bit */
 429                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 430                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 431                 }
 432         } else {
 433                 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
 434                         opl3->connection_reg &= ~connect_mask;
 435                         /* clear connection bit */
 436                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 437                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 438                 }
 439         }
 440
 441 #ifdef DEBUG_MIDI
 442         snd_printk(KERN_DEBUG "  --> setting OPL3 connection: 0x%x\n",
 443                    opl3->connection_reg);
 444 #endif
 445         /*
 446          * calculate volume depending on connection
 447          * between FM operators (see include/opl3.h)
 448          */
 449         for (i = 0; i < (instr_4op ? 4 : 2); i++)
 450                 vol_op[i] = fm->op[i].ksl_level;
 451
 452         connection = fm->feedback_connection[0] & 0x01;
 453         if (instr_4op) {
 454                 connection <<= 1;
 455                 connection |= fm->feedback_connection[1] & 0x01;
 456
 457                 snd_opl3_calc_volume(&vol_op[3], vel, chan);
 458                 switch (connection) {
 459                 case 0x03:
 460                         snd_opl3_calc_volume(&vol_op[2], vel, chan);
 461                         /* fallthru */
 462                 case 0x02:
 463                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 464                         break;
 465                 case 0x01:
 466                         snd_opl3_calc_volume(&vol_op[1], vel, chan);
 467                 }
 468         } else {
 469                 snd_opl3_calc_volume(&vol_op[1], vel, chan);
 470                 if (connection)
 471                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 472         }
 473
 474         /* Program the FM voice characteristics */
 475         for (i = 0; i < (instr_4op ? 4 : 2); i++) {
 476 #ifdef DEBUG_MIDI
 477                 snd_printk(KERN_DEBUG "  --> programming operator %i\n", i);
 478 #endif
 479                 op_offset = snd_opl3_regmap[voice_offset][i];
 480
 481                 /* Set OPL3 AM_VIB register of requested voice/operator */
 482                 reg_val = fm->op[i].am_vib;
 483                 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 484                 opl3->command(opl3, opl3_reg, reg_val);
 485
 486                 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 487                 reg_val = vol_op[i];
 488                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 489                 opl3->command(opl3, opl3_reg, reg_val);
 490
 491                 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 492                 reg_val = fm->op[i].attack_decay;
 493                 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 494                 opl3->command(opl3, opl3_reg, reg_val);
 495
 496                 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 497                 reg_val = fm->op[i].sustain_release;
 498                 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 499                 opl3->command(opl3, opl3_reg, reg_val);
 500
 501                 /* Select waveform */
 502                 reg_val = fm->op[i].wave_select;
 503                 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 504                 opl3->command(opl3, opl3_reg, reg_val);
 505         }
 506
 507         /* Set operator feedback and 2op inter-operator connection */
 508         reg_val = fm->feedback_connection[0];
 509         /* Set output voice connection */
 510         reg_val |= OPL3_STEREO_BITS;
 511         if (chan->gm_pan < 43)
 512                 reg_val &= ~OPL3_VOICE_TO_RIGHT;
 513         if (chan->gm_pan > 85)
 514                 reg_val &= ~OPL3_VOICE_TO_LEFT;
 515         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 516         opl3->command(opl3, opl3_reg, reg_val);
 517
 518         if (instr_4op) {
 519                 /* Set 4op inter-operator connection */
 520                 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
 521                 /* Set output voice connection */
 522                 reg_val |= OPL3_STEREO_BITS;
 523                 if (chan->gm_pan < 43)
 524                         reg_val &= ~OPL3_VOICE_TO_RIGHT;
 525                 if (chan->gm_pan > 85)
 526                         reg_val &= ~OPL3_VOICE_TO_LEFT;
 527                 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
 528                                        voice_offset + 3);
 529                 opl3->command(opl3, opl3_reg, reg_val);
 530         }
 531
 532         /*
 533          * Special treatment of percussion notes for fm:
 534          * Requested pitch is really program, and pitch for
 535          * device is whatever was specified in the patch library.
 536          */
 537         if (fm->fix_key)
 538                 note = fm->fix_key;
 539         /*
 540          * use transpose if defined in patch library
 541          */
 542         if (fm->trnsps)
 543                 note += (fm->trnsps - 64);
 544
 545         snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
 546
 547         /* Set OPL3 FNUM_LOW register of requested voice */
 548         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 549         opl3->command(opl3, opl3_reg, fnum);
 550
 551         opl3->voices[voice].keyon_reg = blocknum;
 552
 553         /* Set output sound flag */
 554         blocknum |= OPL3_KEYON_BIT;
 555
 556 #ifdef DEBUG_MIDI
 557         snd_printk(KERN_DEBUG "  --> trigger voice %i\n", voice);
 558 #endif
 559         /* Set OPL3 KEYON_BLOCK register of requested voice */
 560         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 561         opl3->command(opl3, opl3_reg, blocknum);
 562
 563         /* kill note after fixed duration (in centiseconds) */
 564         if (fm->fix_dur) {
 565                 opl3->voices[voice].note_off = jiffies +
 566                         (fm->fix_dur * HZ) / 100;
 567                 snd_opl3_start_timer(opl3);
 568                 opl3->voices[voice].note_off_check = 1;
 569         } else
 570                 opl3->voices[voice].note_off_check = 0;
 571
 572         /* get extra pgm, but avoid possible loops */
 573         extra_prg = (extra_prg) ? 0 : fm->modes;
 574
 575         /* do the bookkeeping */
 576         vp->time = opl3->use_time++;
 577         vp->note = key;
 578         vp->chan = chan;
 579
 580         if (instr_4op) {
 581                 vp->state = SNDRV_OPL3_ST_ON_4OP;
 582
 583                 vp2 = &opl3->voices[voice + 3];
 584                 vp2->time = opl3->use_time++;
 585                 vp2->note = key;
 586                 vp2->chan = chan;
 587                 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
 588         } else {
 589                 if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 590                         /* 4op killed by 2op, release bounded voice */
 591                         vp2 = &opl3->voices[voice + 3];
 592                         vp2->time = opl3->use_time++;
 593                         vp2->state = SNDRV_OPL3_ST_OFF;
 594                 }
 595                 vp->state = SNDRV_OPL3_ST_ON_2OP;
 596         }
 597
 598 #ifdef DEBUG_ALLOC
 599         debug_alloc(opl3, "note on ", voice);
 600 #endif
 601
 602         /* allocate extra program if specified in patch library */
 603         if (extra_prg) {
 604                 if (extra_prg > 128) {
 605                         bank = 128;
 606                         /* percussions start at 35 */
 607                         prg = extra_prg - 128 + 35 - 1;
 608                 } else {
 609                         bank = 0;
 610                         prg = extra_prg - 1;
 611                 }
 612 #ifdef DEBUG_MIDI
 613                 snd_printk(KERN_DEBUG " *** allocating extra program\n");
 614 #endif
 615                 goto __extra_prg;
 616         }
 617         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 618 }
 619
 620 static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
 621 {
 622         unsigned short reg_side;
 623         unsigned char voice_offset;
 624         unsigned short opl3_reg;
 625
 626         struct snd_opl3_voice *vp, *vp2;
 627
 628         if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
 629                 return;
 630
 631         vp = &opl3->voices[voice];
 632         if (voice < MAX_OPL2_VOICES) {
 633                 /* Left register block for voices 0 .. 8 */
 634                 reg_side = OPL3_LEFT;
 635                 voice_offset = voice;
 636         } else {
 637                 /* Right register block for voices 9 .. 17 */
 638                 reg_side = OPL3_RIGHT;
 639                 voice_offset = voice - MAX_OPL2_VOICES;
 640         }
 641
 642         /* kill voice */
 643 #ifdef DEBUG_MIDI
 644         snd_printk(KERN_DEBUG "  --> kill voice %i\n", voice);
 645 #endif
 646         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 647         /* clear Key ON bit */
 648         opl3->command(opl3, opl3_reg, vp->keyon_reg);
 649
 650         /* do the bookkeeping */
 651         vp->time = opl3->use_time++;
 652
 653         if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 654                 vp2 = &opl3->voices[voice + 3];
 655
 656                 vp2->time = opl3->use_time++;
 657                 vp2->state = SNDRV_OPL3_ST_OFF;
 658         }
 659         vp->state = SNDRV_OPL3_ST_OFF;
 660 #ifdef DEBUG_ALLOC
 661         debug_alloc(opl3, "note off", voice);
 662 #endif
 663
 664 }
 665
 666 /*
 667  * Release a note in response to a midi note off.
 668  */
 669 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
 670                                      struct snd_midi_channel *chan)
 671 {
 672         struct snd_opl3 *opl3;
 673
 674         int voice;
 675         struct snd_opl3_voice *vp;
 676
 677         opl3 = p;
 678
 679 #ifdef DEBUG_MIDI
 680         snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
 681                    chan->number, chan->midi_program, note);
 682 #endif
 683
 684         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 685                 if (chan->drum_channel && use_internal_drums) {
 686                         snd_opl3_drum_switch(opl3, note, vel, 0, chan);
 687                         return;
 688                 }
 689                 /* this loop will hopefully kill all extra voices, because
 690                    they are grouped by the same channel and note values */
 691                 for (voice = 0; voice < opl3->max_voices; voice++) {
 692                         vp = &opl3->voices[voice];
 693                         if (vp->state > 0 && vp->chan == chan && vp->note == note) {
 694                                 snd_opl3_kill_voice(opl3, voice);
 695                         }
 696                 }
 697         } else {
 698                 /* remap OSS voices */
 699                 if (chan->number < MAX_OPL3_VOICES) {
 700                         voice = snd_opl3_oss_map[chan->number];
 701                         snd_opl3_kill_voice(opl3, voice);
 702                 }
 703         }
 704 }
 705
 706 void snd_opl3_note_off(void *p, int note, int vel,
 707                        struct snd_midi_channel *chan)
 708 {
 709         struct snd_opl3 *opl3 = p;
 710         unsigned long flags;
 711
 712         spin_lock_irqsave(&opl3->voice_lock, flags);
 713         snd_opl3_note_off_unsafe(p, note, vel, chan);
 714         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 715 }
 716
 717 /*
 718  * key pressure change
 719  */
 720 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
 721 {
 722         struct snd_opl3 *opl3;
 723
 724         opl3 = p;
 725 #ifdef DEBUG_MIDI
 726         snd_printk(KERN_DEBUG "Key pressure, ch#: %i, inst#: %i\n",
 727                    chan->number, chan->midi_program);
 728 #endif
 729 }
 730
 731 /*
 732  * terminate note
 733  */
 734 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
 735 {
 736         struct snd_opl3 *opl3;
 737
 738         opl3 = p;
 739 #ifdef DEBUG_MIDI
 740         snd_printk(KERN_DEBUG "Terminate note, ch#: %i, inst#: %i\n",
 741                    chan->number, chan->midi_program);
 742 #endif
 743 }
 744
 745 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
 746 {
 747         unsigned short reg_side;
 748         unsigned char voice_offset;
 749         unsigned short opl3_reg;
 750
 751         unsigned char fnum, blocknum;
 752
 753         struct snd_opl3_voice *vp;
 754
 755         if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
 756                 return;
 757
 758         vp = &opl3->voices[voice];
 759         if (vp->chan == NULL)
 760                 return; /* not allocated? */
 761
 762         if (voice < MAX_OPL2_VOICES) {
 763                 /* Left register block for voices 0 .. 8 */
 764                 reg_side = OPL3_LEFT;
 765                 voice_offset = voice;
 766         } else {
 767                 /* Right register block for voices 9 .. 17 */
 768                 reg_side = OPL3_RIGHT;
 769                 voice_offset = voice - MAX_OPL2_VOICES;
 770         }
 771
 772         snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
 773
 774         /* Set OPL3 FNUM_LOW register of requested voice */
 775         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 776         opl3->command(opl3, opl3_reg, fnum);
 777
 778         vp->keyon_reg = blocknum;
 779
 780         /* Set output sound flag */
 781         blocknum |= OPL3_KEYON_BIT;
 782
 783         /* Set OPL3 KEYON_BLOCK register of requested voice */
 784         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 785         opl3->command(opl3, opl3_reg, blocknum);
 786
 787         vp->time = opl3->use_time++;
 788 }
 789
 790 /*
 791  * Update voice pitch controller
 792  */
 793 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
 794 {
 795         int voice;
 796         struct snd_opl3_voice *vp;
 797
 798         unsigned long flags;
 799
 800         spin_lock_irqsave(&opl3->voice_lock, flags);
 801
 802         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 803                 for (voice = 0; voice < opl3->max_voices; voice++) {
 804                         vp = &opl3->voices[voice];
 805                         if (vp->state > 0 && vp->chan == chan) {
 806                                 snd_opl3_update_pitch(opl3, voice);
 807                         }
 808                 }
 809         } else {
 810                 /* remap OSS voices */
 811                 if (chan->number < MAX_OPL3_VOICES) {
 812                         voice = snd_opl3_oss_map[chan->number];
 813                         snd_opl3_update_pitch(opl3, voice);
 814                 }
 815         }
 816         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 817 }
 818
 819 /*
 820  * Deal with a controller type event.  This includes all types of
 821  * control events, not just the midi controllers
 822  */
 823 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
 824 {
 825         struct snd_opl3 *opl3;
 826
 827         opl3 = p;
 828 #ifdef DEBUG_MIDI
 829         snd_printk(KERN_DEBUG "Controller, TYPE = %i, ch#: %i, inst#: %i\n",
 830                    type, chan->number, chan->midi_program);
 831 #endif
 832
 833         switch (type) {
 834         case MIDI_CTL_MSB_MODWHEEL:
 835                 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
 836                         opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
 837                 else
 838                         opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
 839                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 840                                  opl3->drum_reg);
 841                 break;
 842         case MIDI_CTL_E2_TREMOLO_DEPTH:
 843                 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
 844                         opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
 845                 else
 846                         opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
 847                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 848                                  opl3->drum_reg);
 849                 break;
 850         case MIDI_CTL_PITCHBEND:
 851                 snd_opl3_pitch_ctrl(opl3, chan);
 852                 break;
 853         }
 854 }
 855
 856 /*
 857  * NRPN events
 858  */
 859 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
 860                    struct snd_midi_channel_set *chset)
 861 {
 862         struct snd_opl3 *opl3;
 863
 864         opl3 = p;
 865 #ifdef DEBUG_MIDI
 866         snd_printk(KERN_DEBUG "NRPN, ch#: %i, inst#: %i\n",
 867                    chan->number, chan->midi_program);
 868 #endif
 869 }
 870
 871 /*
 872  * receive sysex
 873  */
 874 void snd_opl3_sysex(void *p, unsigned char *buf, int len,
 875                     int parsed, struct snd_midi_channel_set *chset)
 876 {
 877         struct snd_opl3 *opl3;
 878
 879         opl3 = p;
 880 #ifdef DEBUG_MIDI
 881         snd_printk(KERN_DEBUG "SYSEX\n");
 882 #endif
 883 }