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 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
  29                                      struct snd_midi_channel *chan);
  30 /*
  31  * The next table looks magical, but it certainly is not. Its values have
  32  * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
  33  * for i=0. This log-table converts a linear volume-scaling (0..127) to a
  34  * logarithmic scaling as present in the FM-synthesizer chips. so :    Volume
  35  * 64 =  0 db = relative volume  0 and:    Volume 32 = -6 db = relative
  36  * volume -8 it was implemented as a table because it is only 128 bytes and
  37  * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>)
  38  */
  39
  40 static char opl3_volume_table[128] =
  41 {
  42         -63, -48, -40, -35, -32, -29, -27, -26,
  43         -24, -23, -21, -20, -19, -18, -18, -17,
  44         -16, -15, -15, -14, -13, -13, -12, -12,
  45         -11, -11, -10, -10, -10, -9, -9, -8,
  46         -8, -8, -7, -7, -7, -6, -6, -6,
  47         -5, -5, -5, -5, -4, -4, -4, -4,
  48         -3, -3, -3, -3, -2, -2, -2, -2,
  49         -2, -1, -1, -1, -1, 0, 0, 0,
  50         0, 0, 0, 1, 1, 1, 1, 1,
  51         1, 2, 2, 2, 2, 2, 2, 2,
  52         3, 3, 3, 3, 3, 3, 3, 4,
  53         4, 4, 4, 4, 4, 4, 4, 5,
  54         5, 5, 5, 5, 5, 5, 5, 5,
  55         6, 6, 6, 6, 6, 6, 6, 6,
  56         6, 7, 7, 7, 7, 7, 7, 7,
  57         7, 7, 7, 8, 8, 8, 8, 8
  58 };
  59
  60 void snd_opl3_calc_volume(unsigned char *volbyte, int vel,
  61                           struct snd_midi_channel *chan)
  62 {
  63         int oldvol, newvol, n;
  64         int volume;
  65
  66         volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127);
  67         if (volume > 127)
  68                 volume = 127;
  69
  70         oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK);
  71
  72         newvol = opl3_volume_table[volume] + oldvol;
  73         if (newvol > OPL3_TOTAL_LEVEL_MASK)
  74                 newvol = OPL3_TOTAL_LEVEL_MASK;
  75         else if (newvol < 0)
  76                 newvol = 0;
  77
  78         n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK);
  79
  80         *volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK);
  81 }
  82
  83 /*
  84  * Converts the note frequency to block and fnum values for the FM chip
  85  */
  86 static short opl3_note_table[16] =
  87 {
  88         305, 323,       /* for pitch bending, -2 semitones */
  89         343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647,
  90         686, 726        /* for pitch bending, +2 semitones */
  91 };
  92
  93 static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum,
  94                                 int note, struct snd_midi_channel *chan)
  95 {
  96         int block = ((note / 12) & 0x07) - 1;
  97         int idx = (note % 12) + 2;
  98         int freq;
  99
 100         if (chan->midi_pitchbend) {
 101                 int pitchbend = chan->midi_pitchbend;
 102                 int segment;
 103
 104                 if (pitchbend < -0x2000)
 105                         pitchbend = -0x2000;
 106                 if (pitchbend > 0x1FFF)
 107                         pitchbend = 0x1FFF;
 108
 109                 segment = pitchbend / 0x1000;
 110                 freq = opl3_note_table[idx+segment];
 111                 freq += ((opl3_note_table[idx+segment+1] - freq) *
 112                          (pitchbend % 0x1000)) / 0x1000;
 113         } else {
 114                 freq = opl3_note_table[idx];
 115         }
 116
 117         *fnum = (unsigned char) freq;
 118         *blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) |
 119                 ((block << 2) & OPL3_BLOCKNUM_MASK);
 120 }
 121
 122
 123 #ifdef DEBUG_ALLOC
 124 static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) {
 125         int i;
 126         char *str = "x.24";
 127
 128         printk(KERN_DEBUG "time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
 129         for (i = 0; i < opl3->max_voices; i++)
 130                 printk(KERN_CONT "%c", *(str + opl3->voices[i].state + 1));
 131         printk(KERN_CONT "\n");
 132 }
 133 #endif
 134
 135 /*
 136  * Get a FM voice (channel) to play a note on.
 137  */
 138 static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op,
 139                           struct snd_midi_channel *chan) {
 140         int chan_4op_1;         /* first voice for 4op instrument */
 141         int chan_4op_2;         /* second voice for 4op instrument */
 142
 143         struct snd_opl3_voice *vp, *vp2;
 144         unsigned int voice_time;
 145         int i;
 146
 147 #ifdef DEBUG_ALLOC
 148         char *alloc_type[3] = { "FREE     ", "CHEAP    ", "EXPENSIVE" };
 149 #endif
 150
 151         /* This is our "allocation cost" table */
 152         enum {
 153                 FREE = 0, CHEAP, EXPENSIVE, END
 154         };
 155
 156         /* Keeps track of what we are finding */
 157         struct best {
 158                 unsigned int time;
 159                 int voice;
 160         } best[END];
 161         struct best *bp;
 162
 163         for (i = 0; i < END; i++) {
 164                 best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */
 165                 best[i].voice = -1;
 166         }
 167
 168         /* Look through all the channels for the most suitable. */
 169         for (i = 0; i < opl3->max_voices; i++) {
 170                 vp = &opl3->voices[i];
 171
 172                 if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL)
 173                   /* skip unavailable channels, allocated by
 174                      drum voices or by bounded 4op voices) */
 175                         continue;
 176
 177                 voice_time = vp->time;
 178                 bp = best;
 179
 180                 chan_4op_1 = ((i < 3) || (i > 8 && i < 12));
 181                 chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15));
 182                 if (instr_4op) {
 183                         /* allocate 4op voice */
 184                         /* skip channels unavailable to 4op instrument */
 185                         if (!chan_4op_1)
 186                                 continue;
 187
 188                         if (vp->state)
 189                                 /* kill one voice, CHEAP */
 190                                 bp++;
 191                         /* get state of bounded 2op channel
 192                            to be allocated for 4op instrument */
 193                         vp2 = &opl3->voices[i + 3];
 194                         if (vp2->state == SNDRV_OPL3_ST_ON_2OP) {
 195                                 /* kill two voices, EXPENSIVE */
 196                                 bp++;
 197                                 voice_time = (voice_time > vp->time) ?
 198                                         voice_time : vp->time;
 199                         }
 200                 } else {
 201                         /* allocate 2op voice */
 202                         if ((chan_4op_1) || (chan_4op_2))
 203                                 /* use bounded channels for 2op, CHEAP */
 204                                 bp++;
 205                         else if (vp->state)
 206                                 /* kill one voice on 2op channel, CHEAP */
 207                                 bp++;
 208                         /* raise kill cost to EXPENSIVE for all channels */
 209                         if (vp->state)
 210                                 bp++;
 211                 }
 212                 if (voice_time < bp->time) {
 213                         bp->time = voice_time;
 214                         bp->voice = i;
 215                 }
 216         }
 217
 218         for (i = 0; i < END; i++) {
 219                 if (best[i].voice >= 0) {
 220 #ifdef DEBUG_ALLOC
 221                         printk(KERN_DEBUG "%s %iop allocation on voice %i\n",
 222                                alloc_type[i], instr_4op ? 4 : 2,
 223                                best[i].voice);
 224 #endif
 225                         return best[i].voice;
 226                 }
 227         }
 228         /* not found */
 229         return -1;
 230 }
 231
 232 /* ------------------------------ */
 233
 234 /*
 235  * System timer interrupt function
 236  */
 237 void snd_opl3_timer_func(struct timer_list *t)
 238 {
 239
 240         struct snd_opl3 *opl3 = from_timer(opl3, t, tlist);
 241         unsigned long flags;
 242         int again = 0;
 243         int i;
 244
 245         spin_lock_irqsave(&opl3->voice_lock, flags);
 246         for (i = 0; i < opl3->max_voices; i++) {
 247                 struct snd_opl3_voice *vp = &opl3->voices[i];
 248                 if (vp->state > 0 && vp->note_off_check) {
 249                         if (vp->note_off == jiffies)
 250                                 snd_opl3_note_off_unsafe(opl3, vp->note, 0,
 251                                                          vp->chan);
 252                         else
 253                                 again++;
 254                 }
 255         }
 256         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 257
 258         spin_lock_irqsave(&opl3->sys_timer_lock, flags);
 259         if (again)
 260                 mod_timer(&opl3->tlist, jiffies + 1);   /* invoke again */
 261         else
 262                 opl3->sys_timer_status = 0;
 263         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 264 }
 265
 266 /*
 267  * Start system timer
 268  */
 269 static void snd_opl3_start_timer(struct snd_opl3 *opl3)
 270 {
 271         unsigned long flags;
 272         spin_lock_irqsave(&opl3->sys_timer_lock, flags);
 273         if (! opl3->sys_timer_status) {
 274                 mod_timer(&opl3->tlist, jiffies + 1);
 275                 opl3->sys_timer_status = 1;
 276         }
 277         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 278 }
 279
 280 /* ------------------------------ */
 281
 282
 283 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
 284         0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
 285 };
 286
 287 /*
 288  * Start a note.
 289  */
 290 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
 291 {
 292         struct snd_opl3 *opl3;
 293         int instr_4op;
 294
 295         int voice;
 296         struct snd_opl3_voice *vp, *vp2;
 297         unsigned short connect_mask;
 298         unsigned char connection;
 299         unsigned char vol_op[4];
 300
 301         int extra_prg = 0;
 302
 303         unsigned short reg_side;
 304         unsigned char op_offset;
 305         unsigned char voice_offset;
 306         unsigned short opl3_reg;
 307         unsigned char reg_val;
 308         unsigned char prg, bank;
 309
 310         int key = note;
 311         unsigned char fnum, blocknum;
 312         int i;
 313
 314         struct fm_patch *patch;
 315         struct fm_instrument *fm;
 316         unsigned long flags;
 317
 318         opl3 = p;
 319
 320 #ifdef DEBUG_MIDI
 321         snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
 322                    chan->number, chan->midi_program, note, vel);
 323 #endif
 324
 325         /* in SYNTH mode, application takes care of voices */
 326         /* in SEQ mode, drum voice numbers are notes on drum channel */
 327         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 328                 if (chan->drum_channel) {
 329                         /* percussion instruments are located in bank 128 */
 330                         bank = 128;
 331                         prg = note;
 332                 } else {
 333                         bank = chan->gm_bank_select;
 334                         prg = chan->midi_program;
 335                 }
 336         } else {
 337                 /* Prepare for OSS mode */
 338                 if (chan->number >= MAX_OPL3_VOICES)
 339                         return;
 340
 341                 /* OSS instruments are located in bank 127 */
 342                 bank = 127;
 343                 prg = chan->midi_program;
 344         }
 345
 346         spin_lock_irqsave(&opl3->voice_lock, flags);
 347
 348         if (use_internal_drums) {
 349                 snd_opl3_drum_switch(opl3, note, vel, 1, chan);
 350                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 351                 return;
 352         }
 353
 354  __extra_prg:
 355         patch = snd_opl3_find_patch(opl3, prg, bank, 0);
 356         if (!patch) {
 357                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 358                 return;
 359         }
 360
 361         fm = &patch->inst;
 362         switch (patch->type) {
 363         case FM_PATCH_OPL2:
 364                 instr_4op = 0;
 365                 break;
 366         case FM_PATCH_OPL3:
 367                 if (opl3->hardware >= OPL3_HW_OPL3) {
 368                         instr_4op = 1;
 369                         break;
 370                 }
 371                 /* fall through */
 372         default:
 373                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 374                 return;
 375         }
 376 #ifdef DEBUG_MIDI
 377         snd_printk(KERN_DEBUG "  --> OPL%i instrument: %s\n",
 378                    instr_4op ? 3 : 2, patch->name);
 379 #endif
 380         /* in SYNTH mode, application takes care of voices */
 381         /* in SEQ mode, allocate voice on free OPL3 channel */
 382         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 383                 voice = opl3_get_voice(opl3, instr_4op, chan);
 384         } else {
 385                 /* remap OSS voice */
 386                 voice = snd_opl3_oss_map[chan->number];
 387         }
 388
 389         if (voice < 0) {
 390                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 391                 return;
 392         }
 393
 394         if (voice < MAX_OPL2_VOICES) {
 395                 /* Left register block for voices 0 .. 8 */
 396                 reg_side = OPL3_LEFT;
 397                 voice_offset = voice;
 398                 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
 399         } else {
 400                 /* Right register block for voices 9 .. 17 */
 401                 reg_side = OPL3_RIGHT;
 402                 voice_offset = voice - MAX_OPL2_VOICES;
 403                 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
 404         }
 405
 406         /* kill voice on channel */
 407         vp = &opl3->voices[voice];
 408         if (vp->state > 0) {
 409                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 410                 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 411                 opl3->command(opl3, opl3_reg, reg_val);
 412         }
 413         if (instr_4op) {
 414                 vp2 = &opl3->voices[voice + 3];
 415                 if (vp2->state > 0) {
 416                         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
 417                                                voice_offset + 3);
 418                         reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 419                         opl3->command(opl3, opl3_reg, reg_val);
 420                 }
 421         }
 422
 423         /* set connection register */
 424         if (instr_4op) {
 425                 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
 426                         opl3->connection_reg |= connect_mask;
 427                         /* set connection bit */
 428                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 429                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 430                 }
 431         } else {
 432                 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
 433                         opl3->connection_reg &= ~connect_mask;
 434                         /* clear connection bit */
 435                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 436                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 437                 }
 438         }
 439
 440 #ifdef DEBUG_MIDI
 441         snd_printk(KERN_DEBUG "  --> setting OPL3 connection: 0x%x\n",
 442                    opl3->connection_reg);
 443 #endif
 444         /*
 445          * calculate volume depending on connection
 446          * between FM operators (see include/opl3.h)
 447          */
 448         for (i = 0; i < (instr_4op ? 4 : 2); i++)
 449                 vol_op[i] = fm->op[i].ksl_level;
 450
 451         connection = fm->feedback_connection[0] & 0x01;
 452         if (instr_4op) {
 453                 connection <<= 1;
 454                 connection |= fm->feedback_connection[1] & 0x01;
 455
 456                 snd_opl3_calc_volume(&vol_op[3], vel, chan);
 457                 switch (connection) {
 458                 case 0x03:
 459                         snd_opl3_calc_volume(&vol_op[2], vel, chan);
 460                         /* fallthru */
 461                 case 0x02:
 462                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 463                         break;
 464                 case 0x01:
 465                         snd_opl3_calc_volume(&vol_op[1], vel, chan);
 466                 }
 467         } else {
 468                 snd_opl3_calc_volume(&vol_op[1], vel, chan);
 469                 if (connection)
 470                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 471         }
 472
 473         /* Program the FM voice characteristics */
 474         for (i = 0; i < (instr_4op ? 4 : 2); i++) {
 475 #ifdef DEBUG_MIDI
 476                 snd_printk(KERN_DEBUG "  --> programming operator %i\n", i);
 477 #endif
 478                 op_offset = snd_opl3_regmap[voice_offset][i];
 479
 480                 /* Set OPL3 AM_VIB register of requested voice/operator */
 481                 reg_val = fm->op[i].am_vib;
 482                 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 483                 opl3->command(opl3, opl3_reg, reg_val);
 484
 485                 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 486                 reg_val = vol_op[i];
 487                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 488                 opl3->command(opl3, opl3_reg, reg_val);
 489
 490                 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 491                 reg_val = fm->op[i].attack_decay;
 492                 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 493                 opl3->command(opl3, opl3_reg, reg_val);
 494
 495                 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 496                 reg_val = fm->op[i].sustain_release;
 497                 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 498                 opl3->command(opl3, opl3_reg, reg_val);
 499
 500                 /* Select waveform */
 501                 reg_val = fm->op[i].wave_select;
 502                 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 503                 opl3->command(opl3, opl3_reg, reg_val);
 504         }
 505
 506         /* Set operator feedback and 2op inter-operator connection */
 507         reg_val = fm->feedback_connection[0];
 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 + voice_offset);
 515         opl3->command(opl3, opl3_reg, reg_val);
 516
 517         if (instr_4op) {
 518                 /* Set 4op inter-operator connection */
 519                 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
 520                 /* Set output voice connection */
 521                 reg_val |= OPL3_STEREO_BITS;
 522                 if (chan->gm_pan < 43)
 523                         reg_val &= ~OPL3_VOICE_TO_RIGHT;
 524                 if (chan->gm_pan > 85)
 525                         reg_val &= ~OPL3_VOICE_TO_LEFT;
 526                 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
 527                                        voice_offset + 3);
 528                 opl3->command(opl3, opl3_reg, reg_val);
 529         }
 530
 531         /*
 532          * Special treatment of percussion notes for fm:
 533          * Requested pitch is really program, and pitch for
 534          * device is whatever was specified in the patch library.
 535          */
 536         if (fm->fix_key)
 537                 note = fm->fix_key;
 538         /*
 539          * use transpose if defined in patch library
 540          */
 541         if (fm->trnsps)
 542                 note += (fm->trnsps - 64);
 543
 544         snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
 545
 546         /* Set OPL3 FNUM_LOW register of requested voice */
 547         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 548         opl3->command(opl3, opl3_reg, fnum);
 549
 550         opl3->voices[voice].keyon_reg = blocknum;
 551
 552         /* Set output sound flag */
 553         blocknum |= OPL3_KEYON_BIT;
 554
 555 #ifdef DEBUG_MIDI
 556         snd_printk(KERN_DEBUG "  --> trigger voice %i\n", voice);
 557 #endif
 558         /* Set OPL3 KEYON_BLOCK register of requested voice */
 559         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 560         opl3->command(opl3, opl3_reg, blocknum);
 561
 562         /* kill note after fixed duration (in centiseconds) */
 563         if (fm->fix_dur) {
 564                 opl3->voices[voice].note_off = jiffies +
 565                         (fm->fix_dur * HZ) / 100;
 566                 snd_opl3_start_timer(opl3);
 567                 opl3->voices[voice].note_off_check = 1;
 568         } else
 569                 opl3->voices[voice].note_off_check = 0;
 570
 571         /* get extra pgm, but avoid possible loops */
 572         extra_prg = (extra_prg) ? 0 : fm->modes;
 573
 574         /* do the bookkeeping */
 575         vp->time = opl3->use_time++;
 576         vp->note = key;
 577         vp->chan = chan;
 578
 579         if (instr_4op) {
 580                 vp->state = SNDRV_OPL3_ST_ON_4OP;
 581
 582                 vp2 = &opl3->voices[voice + 3];
 583                 vp2->time = opl3->use_time++;
 584                 vp2->note = key;
 585                 vp2->chan = chan;
 586                 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
 587         } else {
 588                 if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 589                         /* 4op killed by 2op, release bounded voice */
 590                         vp2 = &opl3->voices[voice + 3];
 591                         vp2->time = opl3->use_time++;
 592                         vp2->state = SNDRV_OPL3_ST_OFF;
 593                 }
 594                 vp->state = SNDRV_OPL3_ST_ON_2OP;
 595         }
 596
 597 #ifdef DEBUG_ALLOC
 598         debug_alloc(opl3, "note on ", voice);
 599 #endif
 600
 601         /* allocate extra program if specified in patch library */
 602         if (extra_prg) {
 603                 if (extra_prg > 128) {
 604                         bank = 128;
 605                         /* percussions start at 35 */
 606                         prg = extra_prg - 128 + 35 - 1;
 607                 } else {
 608                         bank = 0;
 609                         prg = extra_prg - 1;
 610                 }
 611 #ifdef DEBUG_MIDI
 612                 snd_printk(KERN_DEBUG " *** allocating extra program\n");
 613 #endif
 614                 goto __extra_prg;
 615         }
 616         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 617 }
 618
 619 static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
 620 {
 621         unsigned short reg_side;
 622         unsigned char voice_offset;
 623         unsigned short opl3_reg;
 624
 625         struct snd_opl3_voice *vp, *vp2;
 626
 627         if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
 628                 return;
 629
 630         vp = &opl3->voices[voice];
 631         if (voice < MAX_OPL2_VOICES) {
 632                 /* Left register block for voices 0 .. 8 */
 633                 reg_side = OPL3_LEFT;
 634                 voice_offset = voice;
 635         } else {
 636                 /* Right register block for voices 9 .. 17 */
 637                 reg_side = OPL3_RIGHT;
 638                 voice_offset = voice - MAX_OPL2_VOICES;
 639         }
 640
 641         /* kill voice */
 642 #ifdef DEBUG_MIDI
 643         snd_printk(KERN_DEBUG "  --> kill voice %i\n", voice);
 644 #endif
 645         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 646         /* clear Key ON bit */
 647         opl3->command(opl3, opl3_reg, vp->keyon_reg);
 648
 649         /* do the bookkeeping */
 650         vp->time = opl3->use_time++;
 651
 652         if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 653                 vp2 = &opl3->voices[voice + 3];
 654
 655                 vp2->time = opl3->use_time++;
 656                 vp2->state = SNDRV_OPL3_ST_OFF;
 657         }
 658         vp->state = SNDRV_OPL3_ST_OFF;
 659 #ifdef DEBUG_ALLOC
 660         debug_alloc(opl3, "note off", voice);
 661 #endif
 662
 663 }
 664
 665 /*
 666  * Release a note in response to a midi note off.
 667  */
 668 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
 669                                      struct snd_midi_channel *chan)
 670 {
 671         struct snd_opl3 *opl3;
 672
 673         int voice;
 674         struct snd_opl3_voice *vp;
 675
 676         opl3 = p;
 677
 678 #ifdef DEBUG_MIDI
 679         snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
 680                    chan->number, chan->midi_program, note);
 681 #endif
 682
 683         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 684                 if (chan->drum_channel && use_internal_drums) {
 685                         snd_opl3_drum_switch(opl3, note, vel, 0, chan);
 686                         return;
 687                 }
 688                 /* this loop will hopefully kill all extra voices, because
 689                    they are grouped by the same channel and note values */
 690                 for (voice = 0; voice < opl3->max_voices; voice++) {
 691                         vp = &opl3->voices[voice];
 692                         if (vp->state > 0 && vp->chan == chan && vp->note == note) {
 693                                 snd_opl3_kill_voice(opl3, voice);
 694                         }
 695                 }
 696         } else {
 697                 /* remap OSS voices */
 698                 if (chan->number < MAX_OPL3_VOICES) {
 699                         voice = snd_opl3_oss_map[chan->number];
 700                         snd_opl3_kill_voice(opl3, voice);
 701                 }
 702         }
 703 }
 704
 705 void snd_opl3_note_off(void *p, int note, int vel,
 706                        struct snd_midi_channel *chan)
 707 {
 708         struct snd_opl3 *opl3 = p;
 709         unsigned long flags;
 710
 711         spin_lock_irqsave(&opl3->voice_lock, flags);
 712         snd_opl3_note_off_unsafe(p, note, vel, chan);
 713         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 714 }
 715
 716 /*
 717  * key pressure change
 718  */
 719 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
 720 {
 721 #ifdef DEBUG_MIDI
 722         snd_printk(KERN_DEBUG "Key pressure, ch#: %i, inst#: %i\n",
 723                    chan->number, chan->midi_program);
 724 #endif
 725 }
 726
 727 /*
 728  * terminate note
 729  */
 730 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
 731 {
 732 #ifdef DEBUG_MIDI
 733         snd_printk(KERN_DEBUG "Terminate note, ch#: %i, inst#: %i\n",
 734                    chan->number, chan->midi_program);
 735 #endif
 736 }
 737
 738 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
 739 {
 740         unsigned short reg_side;
 741         unsigned char voice_offset;
 742         unsigned short opl3_reg;
 743
 744         unsigned char fnum, blocknum;
 745
 746         struct snd_opl3_voice *vp;
 747
 748         if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
 749                 return;
 750
 751         vp = &opl3->voices[voice];
 752         if (vp->chan == NULL)
 753                 return; /* not allocated? */
 754
 755         if (voice < MAX_OPL2_VOICES) {
 756                 /* Left register block for voices 0 .. 8 */
 757                 reg_side = OPL3_LEFT;
 758                 voice_offset = voice;
 759         } else {
 760                 /* Right register block for voices 9 .. 17 */
 761                 reg_side = OPL3_RIGHT;
 762                 voice_offset = voice - MAX_OPL2_VOICES;
 763         }
 764
 765         snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
 766
 767         /* Set OPL3 FNUM_LOW register of requested voice */
 768         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 769         opl3->command(opl3, opl3_reg, fnum);
 770
 771         vp->keyon_reg = blocknum;
 772
 773         /* Set output sound flag */
 774         blocknum |= OPL3_KEYON_BIT;
 775
 776         /* Set OPL3 KEYON_BLOCK register of requested voice */
 777         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 778         opl3->command(opl3, opl3_reg, blocknum);
 779
 780         vp->time = opl3->use_time++;
 781 }
 782
 783 /*
 784  * Update voice pitch controller
 785  */
 786 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
 787 {
 788         int voice;
 789         struct snd_opl3_voice *vp;
 790
 791         unsigned long flags;
 792
 793         spin_lock_irqsave(&opl3->voice_lock, flags);
 794
 795         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 796                 for (voice = 0; voice < opl3->max_voices; voice++) {
 797                         vp = &opl3->voices[voice];
 798                         if (vp->state > 0 && vp->chan == chan) {
 799                                 snd_opl3_update_pitch(opl3, voice);
 800                         }
 801                 }
 802         } else {
 803                 /* remap OSS voices */
 804                 if (chan->number < MAX_OPL3_VOICES) {
 805                         voice = snd_opl3_oss_map[chan->number];
 806                         snd_opl3_update_pitch(opl3, voice);
 807                 }
 808         }
 809         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 810 }
 811
 812 /*
 813  * Deal with a controller type event.  This includes all types of
 814  * control events, not just the midi controllers
 815  */
 816 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
 817 {
 818         struct snd_opl3 *opl3;
 819
 820         opl3 = p;
 821 #ifdef DEBUG_MIDI
 822         snd_printk(KERN_DEBUG "Controller, TYPE = %i, ch#: %i, inst#: %i\n",
 823                    type, chan->number, chan->midi_program);
 824 #endif
 825
 826         switch (type) {
 827         case MIDI_CTL_MSB_MODWHEEL:
 828                 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
 829                         opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
 830                 else
 831                         opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
 832                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 833                                  opl3->drum_reg);
 834                 break;
 835         case MIDI_CTL_E2_TREMOLO_DEPTH:
 836                 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
 837                         opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
 838                 else
 839                         opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
 840                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 841                                  opl3->drum_reg);
 842                 break;
 843         case MIDI_CTL_PITCHBEND:
 844                 snd_opl3_pitch_ctrl(opl3, chan);
 845                 break;
 846         }
 847 }
 848
 849 /*
 850  * NRPN events
 851  */
 852 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
 853                    struct snd_midi_channel_set *chset)
 854 {
 855 #ifdef DEBUG_MIDI
 856         snd_printk(KERN_DEBUG "NRPN, ch#: %i, inst#: %i\n",
 857                    chan->number, chan->midi_program);
 858 #endif
 859 }
 860
 861 /*
 862  * receive sysex
 863  */
 864 void snd_opl3_sysex(void *p, unsigned char *buf, int len,
 865                     int parsed, struct snd_midi_channel_set *chset)
 866 {
 867 #ifdef DEBUG_MIDI
 868         snd_printk(KERN_DEBUG "SYSEX\n");
 869 #endif
 870 }