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                           snd_midi_channel_t *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, snd_midi_channel_t *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(opl3_t *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(opl3_t *opl3, int instr_4op,
 139                           snd_midi_channel_t *chan) {
 140         int chan_4op_1;         /* first voice for 4op instrument */
 141         int chan_4op_2;         /* second voice for 4op instrument */
 142
 143         snd_opl3_voice_t *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         opl3_t *opl3 = (opl3_t *)data;
 241         int again = 0;
 242         int i;
 243
 244         spin_lock(&opl3->sys_timer_lock);
 245         for (i = 0; i < opl3->max_voices; i++) {
 246                 snd_opl3_voice_t *vp = &opl3->voices[i];
 247                 if (vp->state > 0 && vp->note_off_check) {
 248                         if (vp->note_off == jiffies)
 249                                 snd_opl3_note_off(opl3, vp->note, 0, vp->chan);
 250                         else
 251                                 again++;
 252                 }
 253         }
 254         if (again) {
 255                 opl3->tlist.expires = jiffies + 1;      /* invoke again */
 256                 add_timer(&opl3->tlist);
 257         } else {
 258                 opl3->sys_timer_status = 0;
 259         }
 260         spin_unlock(&opl3->sys_timer_lock);
 261 }
 262
 263 /*
 264  * Start system timer
 265  */
 266 static void snd_opl3_start_timer(opl3_t *opl3)
 267 {
 268         unsigned long flags;
 269         spin_lock_irqsave(&opl3->sys_timer_lock, flags);
 270         if (! opl3->sys_timer_status) {
 271                 opl3->tlist.expires = jiffies + 1;
 272                 add_timer(&opl3->tlist);
 273                 opl3->sys_timer_status = 1;
 274         }
 275         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 276 }
 277
 278 /* ------------------------------ */
 279
 280
 281 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
 282         0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
 283 };
 284
 285 /*
 286  * Start a note.
 287  */
 288 void snd_opl3_note_on(void *p, int note, int vel, snd_midi_channel_t *chan)
 289 {
 290         opl3_t *opl3;
 291         snd_seq_instr_t wanted;
 292         snd_seq_kinstr_t *kinstr;
 293         int instr_4op;
 294
 295         int voice;
 296         snd_opl3_voice_t *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
 309         int key = note;
 310         unsigned char fnum, blocknum;
 311         int i;
 312
 313         fm_instrument_t *fm;
 314         unsigned long flags;
 315
 316         opl3 = p;
 317
 318 #ifdef DEBUG_MIDI
 319         snd_printk("Note on, ch %i, inst %i, note %i, vel %i\n",
 320                    chan->number, chan->midi_program, note, vel);
 321 #endif
 322         wanted.cluster = 0;
 323         wanted.std = SNDRV_SEQ_INSTR_TYPE2_OPL2_3;
 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                         wanted.bank = 128;
 331                         wanted.prg = note;
 332                 } else {
 333                         wanted.bank = chan->gm_bank_select;
 334                         wanted.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                 wanted.bank = 127;
 343                 wanted.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         kinstr = snd_seq_instr_find(opl3->ilist, &wanted, 1, 0);
 356         if (kinstr == NULL) {
 357                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 358                 return;
 359         }
 360
 361         fm = KINSTR_DATA(kinstr);
 362
 363         switch (fm->type) {
 364         case FM_PATCH_OPL2:
 365                 instr_4op = 0;
 366                 break;
 367         case FM_PATCH_OPL3:
 368                 if (opl3->hardware >= OPL3_HW_OPL3) {
 369                         instr_4op = 1;
 370                         break;
 371                 }
 372         default:
 373                 snd_seq_instr_free_use(opl3->ilist, kinstr);
 374                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 375                 return;
 376         }
 377
 378 #ifdef DEBUG_MIDI
 379         snd_printk("  --> OPL%i instrument: %s\n",
 380                    instr_4op ? 3 : 2, kinstr->name);
 381 #endif
 382         /* in SYNTH mode, application takes care of voices */
 383         /* in SEQ mode, allocate voice on free OPL3 channel */
 384         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 385                 voice = opl3_get_voice(opl3, instr_4op, chan);
 386         } else {
 387                 /* remap OSS voice */
 388                 voice = snd_opl3_oss_map[chan->number];
 389         }
 390
 391         if (voice < MAX_OPL2_VOICES) {
 392                 /* Left register block for voices 0 .. 8 */
 393                 reg_side = OPL3_LEFT;
 394                 voice_offset = voice;
 395                 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
 396         } else {
 397                 /* Right register block for voices 9 .. 17 */
 398                 reg_side = OPL3_RIGHT;
 399                 voice_offset = voice - MAX_OPL2_VOICES;
 400                 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
 401         }
 402
 403         /* kill voice on channel */
 404         vp = &opl3->voices[voice];
 405         if (vp->state > 0) {
 406                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 407                 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 408                 opl3->command(opl3, opl3_reg, reg_val);
 409         }
 410         if (instr_4op) {
 411                 vp2 = &opl3->voices[voice + 3];
 412                 if (vp->state > 0) {
 413                         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
 414                                                voice_offset + 3);
 415                         reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 416                         opl3->command(opl3, opl3_reg, reg_val);
 417                 }
 418         }
 419
 420         /* set connection register */
 421         if (instr_4op) {
 422                 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
 423                         opl3->connection_reg |= connect_mask;
 424                         /* set connection bit */
 425                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 426                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 427                 }
 428         } else {
 429                 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
 430                         opl3->connection_reg &= ~connect_mask;
 431                         /* clear connection bit */
 432                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 433                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 434                 }
 435         }
 436
 437 #ifdef DEBUG_MIDI
 438         snd_printk("  --> setting OPL3 connection: 0x%x\n",
 439                    opl3->connection_reg);
 440 #endif
 441         /*
 442          * calculate volume depending on connection
 443          * between FM operators (see include/opl3.h)
 444          */
 445         for (i = 0; i < (instr_4op ? 4 : 2); i++)
 446                 vol_op[i] = fm->op[i].ksl_level;
 447
 448         connection = fm->feedback_connection[0] & 0x01;
 449         if (instr_4op) {
 450                 connection <<= 1;
 451                 connection |= fm->feedback_connection[1] & 0x01;
 452
 453                 snd_opl3_calc_volume(&vol_op[3], vel, chan);
 454                 switch (connection) {
 455                 case 0x03:
 456                         snd_opl3_calc_volume(&vol_op[2], vel, chan);
 457                         /* fallthru */
 458                 case 0x02:
 459                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 460                         break;
 461                 case 0x01:
 462                         snd_opl3_calc_volume(&vol_op[1], vel, chan);
 463                 }
 464         } else {
 465                 snd_opl3_calc_volume(&vol_op[1], vel, chan);
 466                 if (connection)
 467                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 468         }
 469
 470         /* Program the FM voice characteristics */
 471         for (i = 0; i < (instr_4op ? 4 : 2); i++) {
 472 #ifdef DEBUG_MIDI
 473                 snd_printk("  --> programming operator %i\n", i);
 474 #endif
 475                 op_offset = snd_opl3_regmap[voice_offset][i];
 476
 477                 /* Set OPL3 AM_VIB register of requested voice/operator */
 478                 reg_val = fm->op[i].am_vib;
 479                 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 480                 opl3->command(opl3, opl3_reg, reg_val);
 481
 482                 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 483                 reg_val = vol_op[i];
 484                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 485                 opl3->command(opl3, opl3_reg, reg_val);
 486
 487                 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 488                 reg_val = fm->op[i].attack_decay;
 489                 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 490                 opl3->command(opl3, opl3_reg, reg_val);
 491
 492                 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 493                 reg_val = fm->op[i].sustain_release;
 494                 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 495                 opl3->command(opl3, opl3_reg, reg_val);
 496
 497                 /* Select waveform */
 498                 reg_val = fm->op[i].wave_select;
 499                 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 500                 opl3->command(opl3, opl3_reg, reg_val);
 501         }
 502
 503         /* Set operator feedback and 2op inter-operator connection */
 504         reg_val = fm->feedback_connection[0];
 505         /* Set output voice connection */
 506         reg_val |= OPL3_STEREO_BITS;
 507         if (chan->gm_pan < 43)
 508                 reg_val &= ~OPL3_VOICE_TO_RIGHT;
 509         if (chan->gm_pan > 85)
 510                 reg_val &= ~OPL3_VOICE_TO_LEFT;
 511         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 512         opl3->command(opl3, opl3_reg, reg_val);
 513
 514         if (instr_4op) {
 515                 /* Set 4op inter-operator connection */
 516                 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
 517                 /* Set output voice connection */
 518                 reg_val |= OPL3_STEREO_BITS;
 519                 if (chan->gm_pan < 43)
 520                         reg_val &= ~OPL3_VOICE_TO_RIGHT;
 521                 if (chan->gm_pan > 85)
 522                         reg_val &= ~OPL3_VOICE_TO_LEFT;
 523                 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
 524                                        voice_offset + 3);
 525                 opl3->command(opl3, opl3_reg, reg_val);
 526         }
 527
 528         /*
 529          * Special treatment of percussion notes for fm:
 530          * Requested pitch is really program, and pitch for
 531          * device is whatever was specified in the patch library.
 532          */
 533         if (fm->fix_key)
 534                 note = fm->fix_key;
 535         /*
 536          * use transpose if defined in patch library
 537          */
 538         if (fm->trnsps)
 539                 note += (fm->trnsps - 64);
 540
 541         snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
 542
 543         /* Set OPL3 FNUM_LOW register of requested voice */
 544         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 545         opl3->command(opl3, opl3_reg, fnum);
 546
 547         opl3->voices[voice].keyon_reg = blocknum;
 548
 549         /* Set output sound flag */
 550         blocknum |= OPL3_KEYON_BIT;
 551
 552 #ifdef DEBUG_MIDI
 553         snd_printk("  --> trigger voice %i\n", voice);
 554 #endif
 555         /* Set OPL3 KEYON_BLOCK register of requested voice */
 556         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 557         opl3->command(opl3, opl3_reg, blocknum);
 558
 559         /* kill note after fixed duration (in centiseconds) */
 560         if (fm->fix_dur) {
 561                 opl3->voices[voice].note_off = jiffies +
 562                         (fm->fix_dur * HZ) / 100;
 563                 snd_opl3_start_timer(opl3);
 564                 opl3->voices[voice].note_off_check = 1;
 565         } else
 566                 opl3->voices[voice].note_off_check = 0;
 567
 568         /* get extra pgm, but avoid possible loops */
 569         extra_prg = (extra_prg) ? 0 : fm->modes;
 570
 571         snd_seq_instr_free_use(opl3->ilist, kinstr);
 572
 573         /* do the bookkeeping */
 574         vp->time = opl3->use_time++;
 575         vp->note = key;
 576         vp->chan = chan;
 577
 578         if (instr_4op) {
 579                 vp->state = SNDRV_OPL3_ST_ON_4OP;
 580
 581                 vp2 = &opl3->voices[voice + 3];
 582                 vp2->time = opl3->use_time++;
 583                 vp2->note = key;
 584                 vp2->chan = chan;
 585                 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
 586         } else {
 587                 if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 588                         /* 4op killed by 2op, release bounded voice */
 589                         vp2 = &opl3->voices[voice + 3];
 590                         vp2->time = opl3->use_time++;
 591                         vp2->state = SNDRV_OPL3_ST_OFF;
 592                 }
 593                 vp->state = SNDRV_OPL3_ST_ON_2OP;
 594         }
 595
 596 #ifdef DEBUG_ALLOC
 597         debug_alloc(opl3, "note on ", voice);
 598 #endif
 599
 600         /* allocate extra program if specified in patch library */
 601         if (extra_prg) {
 602                 if (extra_prg > 128) {
 603                         wanted.bank = 128;
 604                         /* percussions start at 35 */
 605                         wanted.prg = extra_prg - 128 + 35 - 1;
 606                 } else {
 607                         wanted.bank = 0;
 608                         wanted.prg = extra_prg - 1;
 609                 }
 610 #ifdef DEBUG_MIDI
 611                 snd_printk(" *** allocating extra program\n");
 612 #endif
 613                 goto __extra_prg;
 614         }
 615         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 616 }
 617
 618 static void snd_opl3_kill_voice(opl3_t *opl3, int voice)
 619 {
 620         unsigned short reg_side;
 621         unsigned char voice_offset;
 622         unsigned short opl3_reg;
 623
 624         snd_opl3_voice_t *vp, *vp2;
 625
 626         snd_assert(voice < MAX_OPL3_VOICES, return);
 627
 628         vp = &opl3->voices[voice];
 629         if (voice < MAX_OPL2_VOICES) {
 630                 /* Left register block for voices 0 .. 8 */
 631                 reg_side = OPL3_LEFT;
 632                 voice_offset = voice;
 633         } else {
 634                 /* Right register block for voices 9 .. 17 */
 635                 reg_side = OPL3_RIGHT;
 636                 voice_offset = voice - MAX_OPL2_VOICES;
 637         }
 638
 639         /* kill voice */
 640 #ifdef DEBUG_MIDI
 641         snd_printk("  --> kill voice %i\n", voice);
 642 #endif
 643         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 644         /* clear Key ON bit */
 645         opl3->command(opl3, opl3_reg, vp->keyon_reg);
 646
 647         /* do the bookkeeping */
 648         vp->time = opl3->use_time++;
 649
 650         if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 651                 vp2 = &opl3->voices[voice + 3];
 652
 653                 vp2->time = opl3->use_time++;
 654                 vp2->state = SNDRV_OPL3_ST_OFF;
 655         }
 656         vp->state = SNDRV_OPL3_ST_OFF;
 657 #ifdef DEBUG_ALLOC
 658         debug_alloc(opl3, "note off", voice);
 659 #endif
 660
 661 }
 662
 663 /*
 664  * Release a note in response to a midi note off.
 665  */
 666 void snd_opl3_note_off(void *p, int note, int vel, snd_midi_channel_t *chan)
 667 {
 668         opl3_t *opl3;
 669
 670         int voice;
 671         snd_opl3_voice_t *vp;
 672
 673         unsigned long flags;
 674
 675         opl3 = p;
 676
 677 #ifdef DEBUG_MIDI
 678         snd_printk("Note off, ch %i, inst %i, note %i\n",
 679                    chan->number, chan->midi_program, note);
 680 #endif
 681
 682         spin_lock_irqsave(&opl3->voice_lock, flags);
 683
 684         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 685                 if (chan->drum_channel && use_internal_drums) {
 686                         snd_opl3_drum_switch(opl3, note, vel, 0, chan);
 687                         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 688                         return;
 689                 }
 690                 /* this loop will hopefully kill all extra voices, because
 691                    they are grouped by the same channel and note values */
 692                 for (voice = 0; voice < opl3->max_voices; voice++) {
 693                         vp = &opl3->voices[voice];
 694                         if (vp->state > 0 && vp->chan == chan && vp->note == note) {
 695                                 snd_opl3_kill_voice(opl3, voice);
 696                         }
 697                 }
 698         } else {
 699                 /* remap OSS voices */
 700                 if (chan->number < MAX_OPL3_VOICES) {
 701                         voice = snd_opl3_oss_map[chan->number];
 702                         snd_opl3_kill_voice(opl3, voice);
 703                 }
 704         }
 705         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 706 }
 707
 708 /*
 709  * key pressure change
 710  */
 711 void snd_opl3_key_press(void *p, int note, int vel, snd_midi_channel_t *chan)
 712 {
 713         opl3_t *opl3;
 714
 715         opl3 = p;
 716 #ifdef DEBUG_MIDI
 717         snd_printk("Key pressure, ch#: %i, inst#: %i\n",
 718                    chan->number, chan->midi_program);
 719 #endif
 720 }
 721
 722 /*
 723  * terminate note
 724  */
 725 void snd_opl3_terminate_note(void *p, int note, snd_midi_channel_t *chan)
 726 {
 727         opl3_t *opl3;
 728
 729         opl3 = p;
 730 #ifdef DEBUG_MIDI
 731         snd_printk("Terminate note, ch#: %i, inst#: %i\n",
 732                    chan->number, chan->midi_program);
 733 #endif
 734 }
 735
 736 static void snd_opl3_update_pitch(opl3_t *opl3, int voice)
 737 {
 738         unsigned short reg_side;
 739         unsigned char voice_offset;
 740         unsigned short opl3_reg;
 741
 742         unsigned char fnum, blocknum;
 743
 744         snd_opl3_voice_t *vp;
 745
 746         snd_assert(voice < MAX_OPL3_VOICES, return);
 747
 748         vp = &opl3->voices[voice];
 749         if (vp->chan == NULL)
 750                 return; /* not allocated? */
 751
 752         if (voice < MAX_OPL2_VOICES) {
 753                 /* Left register block for voices 0 .. 8 */
 754                 reg_side = OPL3_LEFT;
 755                 voice_offset = voice;
 756         } else {
 757                 /* Right register block for voices 9 .. 17 */
 758                 reg_side = OPL3_RIGHT;
 759                 voice_offset = voice - MAX_OPL2_VOICES;
 760         }
 761
 762         snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
 763
 764         /* Set OPL3 FNUM_LOW register of requested voice */
 765         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 766         opl3->command(opl3, opl3_reg, fnum);
 767
 768         vp->keyon_reg = blocknum;
 769
 770         /* Set output sound flag */
 771         blocknum |= OPL3_KEYON_BIT;
 772
 773         /* Set OPL3 KEYON_BLOCK register of requested voice */
 774         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 775         opl3->command(opl3, opl3_reg, blocknum);
 776
 777         vp->time = opl3->use_time++;
 778 }
 779
 780 /*
 781  * Update voice pitch controller
 782  */
 783 static void snd_opl3_pitch_ctrl(opl3_t *opl3, snd_midi_channel_t *chan)
 784 {
 785         int voice;
 786         snd_opl3_voice_t *vp;
 787
 788         unsigned long flags;
 789
 790         spin_lock_irqsave(&opl3->voice_lock, flags);
 791
 792         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 793                 for (voice = 0; voice < opl3->max_voices; voice++) {
 794                         vp = &opl3->voices[voice];
 795                         if (vp->state > 0 && vp->chan == chan) {
 796                                 snd_opl3_update_pitch(opl3, voice);
 797                         }
 798                 }
 799         } else {
 800                 /* remap OSS voices */
 801                 if (chan->number < MAX_OPL3_VOICES) {
 802                         voice = snd_opl3_oss_map[chan->number];
 803                         snd_opl3_update_pitch(opl3, voice);
 804                 }
 805         }
 806         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 807 }
 808
 809 /*
 810  * Deal with a controler type event.  This includes all types of
 811  * control events, not just the midi controllers
 812  */
 813 void snd_opl3_control(void *p, int type, snd_midi_channel_t *chan)
 814 {
 815         opl3_t *opl3;
 816
 817         opl3 = p;
 818 #ifdef DEBUG_MIDI
 819         snd_printk("Controller, TYPE = %i, ch#: %i, inst#: %i\n",
 820                    type, chan->number, chan->midi_program);
 821 #endif
 822
 823         switch (type) {
 824         case MIDI_CTL_MSB_MODWHEEL:
 825                 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
 826                         opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
 827                 else
 828                         opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
 829                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 830                                  opl3->drum_reg);
 831                 break;
 832         case MIDI_CTL_E2_TREMOLO_DEPTH:
 833                 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
 834                         opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
 835                 else
 836                         opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
 837                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 838                                  opl3->drum_reg);
 839                 break;
 840         case MIDI_CTL_PITCHBEND:
 841                 snd_opl3_pitch_ctrl(opl3, chan);
 842                 break;
 843         }
 844 }
 845
 846 /*
 847  * NRPN events
 848  */
 849 void snd_opl3_nrpn(void *p, snd_midi_channel_t *chan,
 850                    snd_midi_channel_set_t *chset)
 851 {
 852         opl3_t *opl3;
 853
 854         opl3 = p;
 855 #ifdef DEBUG_MIDI
 856         snd_printk("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, snd_midi_channel_set_t *chset)
 866 {
 867         opl3_t *opl3;
 868
 869         opl3 = p;
 870 #ifdef DEBUG_MIDI
 871         snd_printk("SYSEX\n");
 872 #endif
 873 }