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                 opl3->tlist.expires = jiffies + 1;      /* invoke again */
 263                 add_timer(&opl3->tlist);
 264         } else {
 265                 opl3->sys_timer_status = 0;
 266         }
 267         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 268 }
 269
 270 /*
 271  * Start system timer
 272  */
 273 static void snd_opl3_start_timer(struct snd_opl3 *opl3)
 274 {
 275         unsigned long flags;
 276         spin_lock_irqsave(&opl3->sys_timer_lock, flags);
 277         if (! opl3->sys_timer_status) {
 278                 opl3->tlist.expires = jiffies + 1;
 279                 add_timer(&opl3->tlist);
 280                 opl3->sys_timer_status = 1;
 281         }
 282         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 283 }
 284
 285 /* ------------------------------ */
 286
 287
 288 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
 289         0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
 290 };
 291
 292 /*
 293  * Start a note.
 294  */
 295 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
 296 {
 297         struct snd_opl3 *opl3;
 298         int instr_4op;
 299
 300         int voice;
 301         struct snd_opl3_voice *vp, *vp2;
 302         unsigned short connect_mask;
 303         unsigned char connection;
 304         unsigned char vol_op[4];
 305
 306         int extra_prg = 0;
 307
 308         unsigned short reg_side;
 309         unsigned char op_offset;
 310         unsigned char voice_offset;
 311         unsigned short opl3_reg;
 312         unsigned char reg_val;
 313         unsigned char prg, bank;
 314
 315         int key = note;
 316         unsigned char fnum, blocknum;
 317         int i;
 318
 319         struct fm_patch *patch;
 320         struct fm_instrument *fm;
 321         unsigned long flags;
 322
 323         opl3 = p;
 324
 325 #ifdef DEBUG_MIDI
 326         snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
 327                    chan->number, chan->midi_program, note, vel);
 328 #endif
 329
 330         /* in SYNTH mode, application takes care of voices */
 331         /* in SEQ mode, drum voice numbers are notes on drum channel */
 332         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 333                 if (chan->drum_channel) {
 334                         /* percussion instruments are located in bank 128 */
 335                         bank = 128;
 336                         prg = note;
 337                 } else {
 338                         bank = chan->gm_bank_select;
 339                         prg = chan->midi_program;
 340                 }
 341         } else {
 342                 /* Prepare for OSS mode */
 343                 if (chan->number >= MAX_OPL3_VOICES)
 344                         return;
 345
 346                 /* OSS instruments are located in bank 127 */
 347                 bank = 127;
 348                 prg = chan->midi_program;
 349         }
 350
 351         spin_lock_irqsave(&opl3->voice_lock, flags);
 352
 353         if (use_internal_drums) {
 354                 snd_opl3_drum_switch(opl3, note, vel, 1, chan);
 355                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 356                 return;
 357         }
 358
 359  __extra_prg:
 360         patch = snd_opl3_find_patch(opl3, prg, bank, 0);
 361         if (!patch) {
 362                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 363                 return;
 364         }
 365
 366         fm = &patch->inst;
 367         switch (patch->type) {
 368         case FM_PATCH_OPL2:
 369                 instr_4op = 0;
 370                 break;
 371         case FM_PATCH_OPL3:
 372                 if (opl3->hardware >= OPL3_HW_OPL3) {
 373                         instr_4op = 1;
 374                         break;
 375                 }
 376         default:
 377                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 378                 return;
 379         }
 380 #ifdef DEBUG_MIDI
 381         snd_printk(KERN_DEBUG "  --> OPL%i instrument: %s\n",
 382                    instr_4op ? 3 : 2, patch->name);
 383 #endif
 384         /* in SYNTH mode, application takes care of voices */
 385         /* in SEQ mode, allocate voice on free OPL3 channel */
 386         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 387                 voice = opl3_get_voice(opl3, instr_4op, chan);
 388         } else {
 389                 /* remap OSS voice */
 390                 voice = snd_opl3_oss_map[chan->number];
 391         }
 392
 393         if (voice < 0) {
 394                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 395                 return;
 396         }
 397
 398         if (voice < MAX_OPL2_VOICES) {
 399                 /* Left register block for voices 0 .. 8 */
 400                 reg_side = OPL3_LEFT;
 401                 voice_offset = voice;
 402                 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
 403         } else {
 404                 /* Right register block for voices 9 .. 17 */
 405                 reg_side = OPL3_RIGHT;
 406                 voice_offset = voice - MAX_OPL2_VOICES;
 407                 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
 408         }
 409
 410         /* kill voice on channel */
 411         vp = &opl3->voices[voice];
 412         if (vp->state > 0) {
 413                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 414                 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 415                 opl3->command(opl3, opl3_reg, reg_val);
 416         }
 417         if (instr_4op) {
 418                 vp2 = &opl3->voices[voice + 3];
 419                 if (vp->state > 0) {
 420                         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
 421                                                voice_offset + 3);
 422                         reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 423                         opl3->command(opl3, opl3_reg, reg_val);
 424                 }
 425         }
 426
 427         /* set connection register */
 428         if (instr_4op) {
 429                 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
 430                         opl3->connection_reg |= connect_mask;
 431                         /* set connection bit */
 432                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 433                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 434                 }
 435         } else {
 436                 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
 437                         opl3->connection_reg &= ~connect_mask;
 438                         /* clear connection bit */
 439                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 440                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 441                 }
 442         }
 443
 444 #ifdef DEBUG_MIDI
 445         snd_printk(KERN_DEBUG "  --> setting OPL3 connection: 0x%x\n",
 446                    opl3->connection_reg);
 447 #endif
 448         /*
 449          * calculate volume depending on connection
 450          * between FM operators (see include/opl3.h)
 451          */
 452         for (i = 0; i < (instr_4op ? 4 : 2); i++)
 453                 vol_op[i] = fm->op[i].ksl_level;
 454
 455         connection = fm->feedback_connection[0] & 0x01;
 456         if (instr_4op) {
 457                 connection <<= 1;
 458                 connection |= fm->feedback_connection[1] & 0x01;
 459
 460                 snd_opl3_calc_volume(&vol_op[3], vel, chan);
 461                 switch (connection) {
 462                 case 0x03:
 463                         snd_opl3_calc_volume(&vol_op[2], vel, chan);
 464                         /* fallthru */
 465                 case 0x02:
 466                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 467                         break;
 468                 case 0x01:
 469                         snd_opl3_calc_volume(&vol_op[1], vel, chan);
 470                 }
 471         } else {
 472                 snd_opl3_calc_volume(&vol_op[1], vel, chan);
 473                 if (connection)
 474                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 475         }
 476
 477         /* Program the FM voice characteristics */
 478         for (i = 0; i < (instr_4op ? 4 : 2); i++) {
 479 #ifdef DEBUG_MIDI
 480                 snd_printk(KERN_DEBUG "  --> programming operator %i\n", i);
 481 #endif
 482                 op_offset = snd_opl3_regmap[voice_offset][i];
 483
 484                 /* Set OPL3 AM_VIB register of requested voice/operator */
 485                 reg_val = fm->op[i].am_vib;
 486                 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 487                 opl3->command(opl3, opl3_reg, reg_val);
 488
 489                 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 490                 reg_val = vol_op[i];
 491                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 492                 opl3->command(opl3, opl3_reg, reg_val);
 493
 494                 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 495                 reg_val = fm->op[i].attack_decay;
 496                 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 497                 opl3->command(opl3, opl3_reg, reg_val);
 498
 499                 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 500                 reg_val = fm->op[i].sustain_release;
 501                 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 502                 opl3->command(opl3, opl3_reg, reg_val);
 503
 504                 /* Select waveform */
 505                 reg_val = fm->op[i].wave_select;
 506                 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 507                 opl3->command(opl3, opl3_reg, reg_val);
 508         }
 509
 510         /* Set operator feedback and 2op inter-operator connection */
 511         reg_val = fm->feedback_connection[0];
 512         /* Set output voice connection */
 513         reg_val |= OPL3_STEREO_BITS;
 514         if (chan->gm_pan < 43)
 515                 reg_val &= ~OPL3_VOICE_TO_RIGHT;
 516         if (chan->gm_pan > 85)
 517                 reg_val &= ~OPL3_VOICE_TO_LEFT;
 518         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 519         opl3->command(opl3, opl3_reg, reg_val);
 520
 521         if (instr_4op) {
 522                 /* Set 4op inter-operator connection */
 523                 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
 524                 /* Set output voice connection */
 525                 reg_val |= OPL3_STEREO_BITS;
 526                 if (chan->gm_pan < 43)
 527                         reg_val &= ~OPL3_VOICE_TO_RIGHT;
 528                 if (chan->gm_pan > 85)
 529                         reg_val &= ~OPL3_VOICE_TO_LEFT;
 530                 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
 531                                        voice_offset + 3);
 532                 opl3->command(opl3, opl3_reg, reg_val);
 533         }
 534
 535         /*
 536          * Special treatment of percussion notes for fm:
 537          * Requested pitch is really program, and pitch for
 538          * device is whatever was specified in the patch library.
 539          */
 540         if (fm->fix_key)
 541                 note = fm->fix_key;
 542         /*
 543          * use transpose if defined in patch library
 544          */
 545         if (fm->trnsps)
 546                 note += (fm->trnsps - 64);
 547
 548         snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
 549
 550         /* Set OPL3 FNUM_LOW register of requested voice */
 551         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 552         opl3->command(opl3, opl3_reg, fnum);
 553
 554         opl3->voices[voice].keyon_reg = blocknum;
 555
 556         /* Set output sound flag */
 557         blocknum |= OPL3_KEYON_BIT;
 558
 559 #ifdef DEBUG_MIDI
 560         snd_printk(KERN_DEBUG "  --> trigger voice %i\n", voice);
 561 #endif
 562         /* Set OPL3 KEYON_BLOCK register of requested voice */
 563         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 564         opl3->command(opl3, opl3_reg, blocknum);
 565
 566         /* kill note after fixed duration (in centiseconds) */
 567         if (fm->fix_dur) {
 568                 opl3->voices[voice].note_off = jiffies +
 569                         (fm->fix_dur * HZ) / 100;
 570                 snd_opl3_start_timer(opl3);
 571                 opl3->voices[voice].note_off_check = 1;
 572         } else
 573                 opl3->voices[voice].note_off_check = 0;
 574
 575         /* get extra pgm, but avoid possible loops */
 576         extra_prg = (extra_prg) ? 0 : fm->modes;
 577
 578         /* do the bookkeeping */
 579         vp->time = opl3->use_time++;
 580         vp->note = key;
 581         vp->chan = chan;
 582
 583         if (instr_4op) {
 584                 vp->state = SNDRV_OPL3_ST_ON_4OP;
 585
 586                 vp2 = &opl3->voices[voice + 3];
 587                 vp2->time = opl3->use_time++;
 588                 vp2->note = key;
 589                 vp2->chan = chan;
 590                 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
 591         } else {
 592                 if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 593                         /* 4op killed by 2op, release bounded voice */
 594                         vp2 = &opl3->voices[voice + 3];
 595                         vp2->time = opl3->use_time++;
 596                         vp2->state = SNDRV_OPL3_ST_OFF;
 597                 }
 598                 vp->state = SNDRV_OPL3_ST_ON_2OP;
 599         }
 600
 601 #ifdef DEBUG_ALLOC
 602         debug_alloc(opl3, "note on ", voice);
 603 #endif
 604
 605         /* allocate extra program if specified in patch library */
 606         if (extra_prg) {
 607                 if (extra_prg > 128) {
 608                         bank = 128;
 609                         /* percussions start at 35 */
 610                         prg = extra_prg - 128 + 35 - 1;
 611                 } else {
 612                         bank = 0;
 613                         prg = extra_prg - 1;
 614                 }
 615 #ifdef DEBUG_MIDI
 616                 snd_printk(KERN_DEBUG " *** allocating extra program\n");
 617 #endif
 618                 goto __extra_prg;
 619         }
 620         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 621 }
 622
 623 static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
 624 {
 625         unsigned short reg_side;
 626         unsigned char voice_offset;
 627         unsigned short opl3_reg;
 628
 629         struct snd_opl3_voice *vp, *vp2;
 630
 631         if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
 632                 return;
 633
 634         vp = &opl3->voices[voice];
 635         if (voice < MAX_OPL2_VOICES) {
 636                 /* Left register block for voices 0 .. 8 */
 637                 reg_side = OPL3_LEFT;
 638                 voice_offset = voice;
 639         } else {
 640                 /* Right register block for voices 9 .. 17 */
 641                 reg_side = OPL3_RIGHT;
 642                 voice_offset = voice - MAX_OPL2_VOICES;
 643         }
 644
 645         /* kill voice */
 646 #ifdef DEBUG_MIDI
 647         snd_printk(KERN_DEBUG "  --> kill voice %i\n", voice);
 648 #endif
 649         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 650         /* clear Key ON bit */
 651         opl3->command(opl3, opl3_reg, vp->keyon_reg);
 652
 653         /* do the bookkeeping */
 654         vp->time = opl3->use_time++;
 655
 656         if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 657                 vp2 = &opl3->voices[voice + 3];
 658
 659                 vp2->time = opl3->use_time++;
 660                 vp2->state = SNDRV_OPL3_ST_OFF;
 661         }
 662         vp->state = SNDRV_OPL3_ST_OFF;
 663 #ifdef DEBUG_ALLOC
 664         debug_alloc(opl3, "note off", voice);
 665 #endif
 666
 667 }
 668
 669 /*
 670  * Release a note in response to a midi note off.
 671  */
 672 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
 673                                      struct snd_midi_channel *chan)
 674 {
 675         struct snd_opl3 *opl3;
 676
 677         int voice;
 678         struct snd_opl3_voice *vp;
 679
 680         opl3 = p;
 681
 682 #ifdef DEBUG_MIDI
 683         snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
 684                    chan->number, chan->midi_program, note);
 685 #endif
 686
 687         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 688                 if (chan->drum_channel && use_internal_drums) {
 689                         snd_opl3_drum_switch(opl3, note, vel, 0, chan);
 690                         return;
 691                 }
 692                 /* this loop will hopefully kill all extra voices, because
 693                    they are grouped by the same channel and note values */
 694                 for (voice = 0; voice < opl3->max_voices; voice++) {
 695                         vp = &opl3->voices[voice];
 696                         if (vp->state > 0 && vp->chan == chan && vp->note == note) {
 697                                 snd_opl3_kill_voice(opl3, voice);
 698                         }
 699                 }
 700         } else {
 701                 /* remap OSS voices */
 702                 if (chan->number < MAX_OPL3_VOICES) {
 703                         voice = snd_opl3_oss_map[chan->number];
 704                         snd_opl3_kill_voice(opl3, voice);
 705                 }
 706         }
 707 }
 708
 709 void snd_opl3_note_off(void *p, int note, int vel,
 710                        struct snd_midi_channel *chan)
 711 {
 712         struct snd_opl3 *opl3 = p;
 713         unsigned long flags;
 714
 715         spin_lock_irqsave(&opl3->voice_lock, flags);
 716         snd_opl3_note_off_unsafe(p, note, vel, chan);
 717         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 718 }
 719
 720 /*
 721  * key pressure change
 722  */
 723 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
 724 {
 725         struct snd_opl3 *opl3;
 726
 727         opl3 = p;
 728 #ifdef DEBUG_MIDI
 729         snd_printk(KERN_DEBUG "Key pressure, ch#: %i, inst#: %i\n",
 730                    chan->number, chan->midi_program);
 731 #endif
 732 }
 733
 734 /*
 735  * terminate note
 736  */
 737 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
 738 {
 739         struct snd_opl3 *opl3;
 740
 741         opl3 = p;
 742 #ifdef DEBUG_MIDI
 743         snd_printk(KERN_DEBUG "Terminate note, ch#: %i, inst#: %i\n",
 744                    chan->number, chan->midi_program);
 745 #endif
 746 }
 747
 748 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
 749 {
 750         unsigned short reg_side;
 751         unsigned char voice_offset;
 752         unsigned short opl3_reg;
 753
 754         unsigned char fnum, blocknum;
 755
 756         struct snd_opl3_voice *vp;
 757
 758         if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
 759                 return;
 760
 761         vp = &opl3->voices[voice];
 762         if (vp->chan == NULL)
 763                 return; /* not allocated? */
 764
 765         if (voice < MAX_OPL2_VOICES) {
 766                 /* Left register block for voices 0 .. 8 */
 767                 reg_side = OPL3_LEFT;
 768                 voice_offset = voice;
 769         } else {
 770                 /* Right register block for voices 9 .. 17 */
 771                 reg_side = OPL3_RIGHT;
 772                 voice_offset = voice - MAX_OPL2_VOICES;
 773         }
 774
 775         snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
 776
 777         /* Set OPL3 FNUM_LOW register of requested voice */
 778         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 779         opl3->command(opl3, opl3_reg, fnum);
 780
 781         vp->keyon_reg = blocknum;
 782
 783         /* Set output sound flag */
 784         blocknum |= OPL3_KEYON_BIT;
 785
 786         /* Set OPL3 KEYON_BLOCK register of requested voice */
 787         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 788         opl3->command(opl3, opl3_reg, blocknum);
 789
 790         vp->time = opl3->use_time++;
 791 }
 792
 793 /*
 794  * Update voice pitch controller
 795  */
 796 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
 797 {
 798         int voice;
 799         struct snd_opl3_voice *vp;
 800
 801         unsigned long flags;
 802
 803         spin_lock_irqsave(&opl3->voice_lock, flags);
 804
 805         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 806                 for (voice = 0; voice < opl3->max_voices; voice++) {
 807                         vp = &opl3->voices[voice];
 808                         if (vp->state > 0 && vp->chan == chan) {
 809                                 snd_opl3_update_pitch(opl3, voice);
 810                         }
 811                 }
 812         } else {
 813                 /* remap OSS voices */
 814                 if (chan->number < MAX_OPL3_VOICES) {
 815                         voice = snd_opl3_oss_map[chan->number];
 816                         snd_opl3_update_pitch(opl3, voice);
 817                 }
 818         }
 819         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 820 }
 821
 822 /*
 823  * Deal with a controller type event.  This includes all types of
 824  * control events, not just the midi controllers
 825  */
 826 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
 827 {
 828         struct snd_opl3 *opl3;
 829
 830         opl3 = p;
 831 #ifdef DEBUG_MIDI
 832         snd_printk(KERN_DEBUG "Controller, TYPE = %i, ch#: %i, inst#: %i\n",
 833                    type, chan->number, chan->midi_program);
 834 #endif
 835
 836         switch (type) {
 837         case MIDI_CTL_MSB_MODWHEEL:
 838                 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
 839                         opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
 840                 else
 841                         opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
 842                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 843                                  opl3->drum_reg);
 844                 break;
 845         case MIDI_CTL_E2_TREMOLO_DEPTH:
 846                 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
 847                         opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
 848                 else
 849                         opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
 850                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 851                                  opl3->drum_reg);
 852                 break;
 853         case MIDI_CTL_PITCHBEND:
 854                 snd_opl3_pitch_ctrl(opl3, chan);
 855                 break;
 856         }
 857 }
 858
 859 /*
 860  * NRPN events
 861  */
 862 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
 863                    struct snd_midi_channel_set *chset)
 864 {
 865         struct snd_opl3 *opl3;
 866
 867         opl3 = p;
 868 #ifdef DEBUG_MIDI
 869         snd_printk(KERN_DEBUG "NRPN, ch#: %i, inst#: %i\n",
 870                    chan->number, chan->midi_program);
 871 #endif
 872 }
 873
 874 /*
 875  * receive sysex
 876  */
 877 void snd_opl3_sysex(void *p, unsigned char *buf, int len,
 878                     int parsed, struct snd_midi_channel_set *chset)
 879 {
 880         struct snd_opl3 *opl3;
 881
 882         opl3 = p;
 883 #ifdef DEBUG_MIDI
 884         snd_printk(KERN_DEBUG "SYSEX\n");
 885 #endif
 886 }