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 int use_internal_drums;
  31
  32 /*
  33  * The next table looks magical, but it certainly is not. Its values have
  34  * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
  35  * for i=0. This log-table converts a linear volume-scaling (0..127) to a
  36  * logarithmic scaling as present in the FM-synthesizer chips. so :    Volume
  37  * 64 =  0 db = relative volume  0 and:    Volume 32 = -6 db = relative
  38  * volume -8 it was implemented as a table because it is only 128 bytes and
  39  * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>)
  40  */
  41
  42 static char opl3_volume_table[128] =
  43 {
  44         -63, -48, -40, -35, -32, -29, -27, -26,
  45         -24, -23, -21, -20, -19, -18, -18, -17,
  46         -16, -15, -15, -14, -13, -13, -12, -12,
  47         -11, -11, -10, -10, -10, -9, -9, -8,
  48         -8, -8, -7, -7, -7, -6, -6, -6,
  49         -5, -5, -5, -5, -4, -4, -4, -4,
  50         -3, -3, -3, -3, -2, -2, -2, -2,
  51         -2, -1, -1, -1, -1, 0, 0, 0,
  52         0, 0, 0, 1, 1, 1, 1, 1,
  53         1, 2, 2, 2, 2, 2, 2, 2,
  54         3, 3, 3, 3, 3, 3, 3, 4,
  55         4, 4, 4, 4, 4, 4, 4, 5,
  56         5, 5, 5, 5, 5, 5, 5, 5,
  57         6, 6, 6, 6, 6, 6, 6, 6,
  58         6, 7, 7, 7, 7, 7, 7, 7,
  59         7, 7, 7, 8, 8, 8, 8, 8
  60 };
  61
  62 void snd_opl3_calc_volume(unsigned char *volbyte, int vel,
  63                           struct snd_midi_channel *chan)
  64 {
  65         int oldvol, newvol, n;
  66         int volume;
  67
  68         volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127);
  69         if (volume > 127)
  70                 volume = 127;
  71
  72         oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK);
  73
  74         newvol = opl3_volume_table[volume] + oldvol;
  75         if (newvol > OPL3_TOTAL_LEVEL_MASK)
  76                 newvol = OPL3_TOTAL_LEVEL_MASK;
  77         else if (newvol < 0)
  78                 newvol = 0;
  79
  80         n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK);
  81
  82         *volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK);
  83 }
  84
  85 /*
  86  * Converts the note frequency to block and fnum values for the FM chip
  87  */
  88 static short opl3_note_table[16] =
  89 {
  90         305, 323,       /* for pitch bending, -2 semitones */
  91         343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647,
  92         686, 726        /* for pitch bending, +2 semitones */
  93 };
  94
  95 static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum,
  96                                 int note, struct snd_midi_channel *chan)
  97 {
  98         int block = ((note / 12) & 0x07) - 1;
  99         int idx = (note % 12) + 2;
 100         int freq;
 101
 102         if (chan->midi_pitchbend) {
 103                 int pitchbend = chan->midi_pitchbend;
 104                 int segment;
 105
 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("time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
 129         for (i = 0; i < opl3->max_voices; i++)
 130                 printk("%c", *(str + opl3->voices[i].state + 1));
 131         printk("\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("%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(unsigned long data)
 238 {
 239
 240         struct snd_opl3 *opl3 = (struct snd_opl3 *)data;
 241         unsigned long flags;
 242         int again = 0;
 243         int i;
 244
 245         spin_lock_irqsave(&opl3->sys_timer_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(opl3, vp->note, 0, vp->chan);
 251                         else
 252                                 again++;
 253                 }
 254         }
 255         if (again) {
 256                 opl3->tlist.expires = jiffies + 1;      /* invoke again */
 257                 add_timer(&opl3->tlist);
 258         } else {
 259                 opl3->sys_timer_status = 0;
 260         }
 261         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 262 }
 263
 264 /*
 265  * Start system timer
 266  */
 267 static void snd_opl3_start_timer(struct snd_opl3 *opl3)
 268 {
 269         unsigned long flags;
 270         spin_lock_irqsave(&opl3->sys_timer_lock, flags);
 271         if (! opl3->sys_timer_status) {
 272                 opl3->tlist.expires = jiffies + 1;
 273                 add_timer(&opl3->tlist);
 274                 opl3->sys_timer_status = 1;
 275         }
 276         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 277 }
 278
 279 /* ------------------------------ */
 280
 281
 282 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
 283         0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
 284 };
 285
 286 /*
 287  * Start a note.
 288  */
 289 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
 290 {
 291         struct snd_opl3 *opl3;
 292         struct snd_seq_instr wanted;
 293         struct snd_seq_kinstr *kinstr;
 294         int instr_4op;
 295
 296         int voice;
 297         struct snd_opl3_voice *vp, *vp2;
 298         unsigned short connect_mask;
 299         unsigned char connection;
 300         unsigned char vol_op[4];
 301
 302         int extra_prg = 0;
 303
 304         unsigned short reg_side;
 305         unsigned char op_offset;
 306         unsigned char voice_offset;
 307         unsigned short opl3_reg;
 308         unsigned char reg_val;
 309
 310         int key = note;
 311         unsigned char fnum, blocknum;
 312         int i;
 313
 314         struct fm_instrument *fm;
 315         unsigned long flags;
 316
 317         opl3 = p;
 318
 319 #ifdef DEBUG_MIDI
 320         snd_printk("Note on, ch %i, inst %i, note %i, vel %i\n",
 321                    chan->number, chan->midi_program, note, vel);
 322 #endif
 323         wanted.cluster = 0;
 324         wanted.std = SNDRV_SEQ_INSTR_TYPE2_OPL2_3;
 325
 326         /* in SYNTH mode, application takes care of voices */
 327         /* in SEQ mode, drum voice numbers are notes on drum channel */
 328         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 329                 if (chan->drum_channel) {
 330                         /* percussion instruments are located in bank 128 */
 331                         wanted.bank = 128;
 332                         wanted.prg = note;
 333                 } else {
 334                         wanted.bank = chan->gm_bank_select;
 335                         wanted.prg = chan->midi_program;
 336                 }
 337         } else {
 338                 /* Prepare for OSS mode */
 339                 if (chan->number >= MAX_OPL3_VOICES)
 340                         return;
 341
 342                 /* OSS instruments are located in bank 127 */
 343                 wanted.bank = 127;
 344                 wanted.prg = chan->midi_program;
 345         }
 346
 347         spin_lock_irqsave(&opl3->voice_lock, flags);
 348
 349         if (use_internal_drums) {
 350                 snd_opl3_drum_switch(opl3, note, vel, 1, chan);
 351                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 352                 return;
 353         }
 354
 355  __extra_prg:
 356         kinstr = snd_seq_instr_find(opl3->ilist, &wanted, 1, 0);
 357         if (kinstr == NULL) {
 358                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 359                 return;
 360         }
 361
 362         fm = KINSTR_DATA(kinstr);
 363
 364         switch (fm->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                 snd_seq_instr_free_use(opl3->ilist, kinstr);
 375                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 376                 return;
 377         }
 378
 379 #ifdef DEBUG_MIDI
 380         snd_printk("  --> OPL%i instrument: %s\n",
 381                    instr_4op ? 3 : 2, kinstr->name);
 382 #endif
 383         /* in SYNTH mode, application takes care of voices */
 384         /* in SEQ mode, allocate voice on free OPL3 channel */
 385         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 386                 voice = opl3_get_voice(opl3, instr_4op, chan);
 387         } else {
 388                 /* remap OSS voice */
 389                 voice = snd_opl3_oss_map[chan->number];
 390         }
 391
 392         if (voice < MAX_OPL2_VOICES) {
 393                 /* Left register block for voices 0 .. 8 */
 394                 reg_side = OPL3_LEFT;
 395                 voice_offset = voice;
 396                 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
 397         } else {
 398                 /* Right register block for voices 9 .. 17 */
 399                 reg_side = OPL3_RIGHT;
 400                 voice_offset = voice - MAX_OPL2_VOICES;
 401                 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
 402         }
 403
 404         /* kill voice on channel */
 405         vp = &opl3->voices[voice];
 406         if (vp->state > 0) {
 407                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 408                 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 409                 opl3->command(opl3, opl3_reg, reg_val);
 410         }
 411         if (instr_4op) {
 412                 vp2 = &opl3->voices[voice + 3];
 413                 if (vp->state > 0) {
 414                         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
 415                                                voice_offset + 3);
 416                         reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 417                         opl3->command(opl3, opl3_reg, reg_val);
 418                 }
 419         }
 420
 421         /* set connection register */
 422         if (instr_4op) {
 423                 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
 424                         opl3->connection_reg |= connect_mask;
 425                         /* set connection bit */
 426                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 427                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 428                 }
 429         } else {
 430                 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
 431                         opl3->connection_reg &= ~connect_mask;
 432                         /* clear connection bit */
 433                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 434                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 435                 }
 436         }
 437
 438 #ifdef DEBUG_MIDI
 439         snd_printk("  --> setting OPL3 connection: 0x%x\n",
 440                    opl3->connection_reg);
 441 #endif
 442         /*
 443          * calculate volume depending on connection
 444          * between FM operators (see include/opl3.h)
 445          */
 446         for (i = 0; i < (instr_4op ? 4 : 2); i++)
 447                 vol_op[i] = fm->op[i].ksl_level;
 448
 449         connection = fm->feedback_connection[0] & 0x01;
 450         if (instr_4op) {
 451                 connection <<= 1;
 452                 connection |= fm->feedback_connection[1] & 0x01;
 453
 454                 snd_opl3_calc_volume(&vol_op[3], vel, chan);
 455                 switch (connection) {
 456                 case 0x03:
 457                         snd_opl3_calc_volume(&vol_op[2], vel, chan);
 458                         /* fallthru */
 459                 case 0x02:
 460                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 461                         break;
 462                 case 0x01:
 463                         snd_opl3_calc_volume(&vol_op[1], vel, chan);
 464                 }
 465         } else {
 466                 snd_opl3_calc_volume(&vol_op[1], vel, chan);
 467                 if (connection)
 468                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 469         }
 470
 471         /* Program the FM voice characteristics */
 472         for (i = 0; i < (instr_4op ? 4 : 2); i++) {
 473 #ifdef DEBUG_MIDI
 474                 snd_printk("  --> programming operator %i\n", i);
 475 #endif
 476                 op_offset = snd_opl3_regmap[voice_offset][i];
 477
 478                 /* Set OPL3 AM_VIB register of requested voice/operator */
 479                 reg_val = fm->op[i].am_vib;
 480                 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 481                 opl3->command(opl3, opl3_reg, reg_val);
 482
 483                 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 484                 reg_val = vol_op[i];
 485                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 486                 opl3->command(opl3, opl3_reg, reg_val);
 487
 488                 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 489                 reg_val = fm->op[i].attack_decay;
 490                 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 491                 opl3->command(opl3, opl3_reg, reg_val);
 492
 493                 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 494                 reg_val = fm->op[i].sustain_release;
 495                 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 496                 opl3->command(opl3, opl3_reg, reg_val);
 497
 498                 /* Select waveform */
 499                 reg_val = fm->op[i].wave_select;
 500                 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 501                 opl3->command(opl3, opl3_reg, reg_val);
 502         }
 503
 504         /* Set operator feedback and 2op inter-operator connection */
 505         reg_val = fm->feedback_connection[0];
 506         /* Set output voice connection */
 507         reg_val |= OPL3_STEREO_BITS;
 508         if (chan->gm_pan < 43)
 509                 reg_val &= ~OPL3_VOICE_TO_RIGHT;
 510         if (chan->gm_pan > 85)
 511                 reg_val &= ~OPL3_VOICE_TO_LEFT;
 512         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 513         opl3->command(opl3, opl3_reg, reg_val);
 514
 515         if (instr_4op) {
 516                 /* Set 4op inter-operator connection */
 517                 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
 518                 /* Set output voice connection */
 519                 reg_val |= OPL3_STEREO_BITS;
 520                 if (chan->gm_pan < 43)
 521                         reg_val &= ~OPL3_VOICE_TO_RIGHT;
 522                 if (chan->gm_pan > 85)
 523                         reg_val &= ~OPL3_VOICE_TO_LEFT;
 524                 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
 525                                        voice_offset + 3);
 526                 opl3->command(opl3, opl3_reg, reg_val);
 527         }
 528
 529         /*
 530          * Special treatment of percussion notes for fm:
 531          * Requested pitch is really program, and pitch for
 532          * device is whatever was specified in the patch library.
 533          */
 534         if (fm->fix_key)
 535                 note = fm->fix_key;
 536         /*
 537          * use transpose if defined in patch library
 538          */
 539         if (fm->trnsps)
 540                 note += (fm->trnsps - 64);
 541
 542         snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
 543
 544         /* Set OPL3 FNUM_LOW register of requested voice */
 545         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 546         opl3->command(opl3, opl3_reg, fnum);
 547
 548         opl3->voices[voice].keyon_reg = blocknum;
 549
 550         /* Set output sound flag */
 551         blocknum |= OPL3_KEYON_BIT;
 552
 553 #ifdef DEBUG_MIDI
 554         snd_printk("  --> trigger voice %i\n", voice);
 555 #endif
 556         /* Set OPL3 KEYON_BLOCK register of requested voice */
 557         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 558         opl3->command(opl3, opl3_reg, blocknum);
 559
 560         /* kill note after fixed duration (in centiseconds) */
 561         if (fm->fix_dur) {
 562                 opl3->voices[voice].note_off = jiffies +
 563                         (fm->fix_dur * HZ) / 100;
 564                 snd_opl3_start_timer(opl3);
 565                 opl3->voices[voice].note_off_check = 1;
 566         } else
 567                 opl3->voices[voice].note_off_check = 0;
 568
 569         /* get extra pgm, but avoid possible loops */
 570         extra_prg = (extra_prg) ? 0 : fm->modes;
 571
 572         snd_seq_instr_free_use(opl3->ilist, kinstr);
 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                         wanted.bank = 128;
 605                         /* percussions start at 35 */
 606                         wanted.prg = extra_prg - 128 + 35 - 1;
 607                 } else {
 608                         wanted.bank = 0;
 609                         wanted.prg = extra_prg - 1;
 610                 }
 611 #ifdef DEBUG_MIDI
 612                 snd_printk(" *** 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         snd_assert(voice < MAX_OPL3_VOICES, return);
 628
 629         vp = &opl3->voices[voice];
 630         if (voice < MAX_OPL2_VOICES) {
 631                 /* Left register block for voices 0 .. 8 */
 632                 reg_side = OPL3_LEFT;
 633                 voice_offset = voice;
 634         } else {
 635                 /* Right register block for voices 9 .. 17 */
 636                 reg_side = OPL3_RIGHT;
 637                 voice_offset = voice - MAX_OPL2_VOICES;
 638         }
 639
 640         /* kill voice */
 641 #ifdef DEBUG_MIDI
 642         snd_printk("  --> kill voice %i\n", voice);
 643 #endif
 644         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 645         /* clear Key ON bit */
 646         opl3->command(opl3, opl3_reg, vp->keyon_reg);
 647
 648         /* do the bookkeeping */
 649         vp->time = opl3->use_time++;
 650
 651         if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 652                 vp2 = &opl3->voices[voice + 3];
 653
 654                 vp2->time = opl3->use_time++;
 655                 vp2->state = SNDRV_OPL3_ST_OFF;
 656         }
 657         vp->state = SNDRV_OPL3_ST_OFF;
 658 #ifdef DEBUG_ALLOC
 659         debug_alloc(opl3, "note off", voice);
 660 #endif
 661
 662 }
 663
 664 /*
 665  * Release a note in response to a midi note off.
 666  */
 667 void snd_opl3_note_off(void *p, int note, int vel, struct snd_midi_channel *chan)
 668 {
 669         struct snd_opl3 *opl3;
 670
 671         int voice;
 672         struct snd_opl3_voice *vp;
 673
 674         unsigned long flags;
 675
 676         opl3 = p;
 677
 678 #ifdef DEBUG_MIDI
 679         snd_printk("Note off, ch %i, inst %i, note %i\n",
 680                    chan->number, chan->midi_program, note);
 681 #endif
 682
 683         spin_lock_irqsave(&opl3->voice_lock, flags);
 684
 685         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 686                 if (chan->drum_channel && use_internal_drums) {
 687                         snd_opl3_drum_switch(opl3, note, vel, 0, chan);
 688                         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 689                         return;
 690                 }
 691                 /* this loop will hopefully kill all extra voices, because
 692                    they are grouped by the same channel and note values */
 693                 for (voice = 0; voice < opl3->max_voices; voice++) {
 694                         vp = &opl3->voices[voice];
 695                         if (vp->state > 0 && vp->chan == chan && vp->note == note) {
 696                                 snd_opl3_kill_voice(opl3, voice);
 697                         }
 698                 }
 699         } else {
 700                 /* remap OSS voices */
 701                 if (chan->number < MAX_OPL3_VOICES) {
 702                         voice = snd_opl3_oss_map[chan->number];
 703                         snd_opl3_kill_voice(opl3, voice);
 704                 }
 705         }
 706         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 707 }
 708
 709 /*
 710  * key pressure change
 711  */
 712 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
 713 {
 714         struct snd_opl3 *opl3;
 715
 716         opl3 = p;
 717 #ifdef DEBUG_MIDI
 718         snd_printk("Key pressure, ch#: %i, inst#: %i\n",
 719                    chan->number, chan->midi_program);
 720 #endif
 721 }
 722
 723 /*
 724  * terminate note
 725  */
 726 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
 727 {
 728         struct snd_opl3 *opl3;
 729
 730         opl3 = p;
 731 #ifdef DEBUG_MIDI
 732         snd_printk("Terminate note, ch#: %i, inst#: %i\n",
 733                    chan->number, chan->midi_program);
 734 #endif
 735 }
 736
 737 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
 738 {
 739         unsigned short reg_side;
 740         unsigned char voice_offset;
 741         unsigned short opl3_reg;
 742
 743         unsigned char fnum, blocknum;
 744
 745         struct snd_opl3_voice *vp;
 746
 747         snd_assert(voice < MAX_OPL3_VOICES, return);
 748
 749         vp = &opl3->voices[voice];
 750         if (vp->chan == NULL)
 751                 return; /* not allocated? */
 752
 753         if (voice < MAX_OPL2_VOICES) {
 754                 /* Left register block for voices 0 .. 8 */
 755                 reg_side = OPL3_LEFT;
 756                 voice_offset = voice;
 757         } else {
 758                 /* Right register block for voices 9 .. 17 */
 759                 reg_side = OPL3_RIGHT;
 760                 voice_offset = voice - MAX_OPL2_VOICES;
 761         }
 762
 763         snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
 764
 765         /* Set OPL3 FNUM_LOW register of requested voice */
 766         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 767         opl3->command(opl3, opl3_reg, fnum);
 768
 769         vp->keyon_reg = blocknum;
 770
 771         /* Set output sound flag */
 772         blocknum |= OPL3_KEYON_BIT;
 773
 774         /* Set OPL3 KEYON_BLOCK register of requested voice */
 775         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 776         opl3->command(opl3, opl3_reg, blocknum);
 777
 778         vp->time = opl3->use_time++;
 779 }
 780
 781 /*
 782  * Update voice pitch controller
 783  */
 784 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
 785 {
 786         int voice;
 787         struct snd_opl3_voice *vp;
 788
 789         unsigned long flags;
 790
 791         spin_lock_irqsave(&opl3->voice_lock, flags);
 792
 793         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 794                 for (voice = 0; voice < opl3->max_voices; voice++) {
 795                         vp = &opl3->voices[voice];
 796                         if (vp->state > 0 && vp->chan == chan) {
 797                                 snd_opl3_update_pitch(opl3, voice);
 798                         }
 799                 }
 800         } else {
 801                 /* remap OSS voices */
 802                 if (chan->number < MAX_OPL3_VOICES) {
 803                         voice = snd_opl3_oss_map[chan->number];
 804                         snd_opl3_update_pitch(opl3, voice);
 805                 }
 806         }
 807         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 808 }
 809
 810 /*
 811  * Deal with a controller type event.  This includes all types of
 812  * control events, not just the midi controllers
 813  */
 814 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
 815 {
 816         struct snd_opl3 *opl3;
 817
 818         opl3 = p;
 819 #ifdef DEBUG_MIDI
 820         snd_printk("Controller, TYPE = %i, ch#: %i, inst#: %i\n",
 821                    type, chan->number, chan->midi_program);
 822 #endif
 823
 824         switch (type) {
 825         case MIDI_CTL_MSB_MODWHEEL:
 826                 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
 827                         opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
 828                 else
 829                         opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
 830                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 831                                  opl3->drum_reg);
 832                 break;
 833         case MIDI_CTL_E2_TREMOLO_DEPTH:
 834                 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
 835                         opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
 836                 else
 837                         opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
 838                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 839                                  opl3->drum_reg);
 840                 break;
 841         case MIDI_CTL_PITCHBEND:
 842                 snd_opl3_pitch_ctrl(opl3, chan);
 843                 break;
 844         }
 845 }
 846
 847 /*
 848  * NRPN events
 849  */
 850 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
 851                    struct snd_midi_channel_set *chset)
 852 {
 853         struct snd_opl3 *opl3;
 854
 855         opl3 = p;
 856 #ifdef DEBUG_MIDI
 857         snd_printk("NRPN, ch#: %i, inst#: %i\n",
 858                    chan->number, chan->midi_program);
 859 #endif
 860 }
 861
 862 /*
 863  * receive sysex
 864  */
 865 void snd_opl3_sysex(void *p, unsigned char *buf, int len,
 866                     int parsed, struct snd_midi_channel_set *chset)
 867 {
 868         struct snd_opl3 *opl3;
 869
 870         opl3 = p;
 871 #ifdef DEBUG_MIDI
 872         snd_printk("SYSEX\n");
 873 #endif
 874 }