git.oblomov.eu Git - linux-2.6/blob - 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         int instr_4op;
 293
 294         int voice;
 295         struct snd_opl3_voice *vp, *vp2;
 296         unsigned short connect_mask;
 297         unsigned char connection;
 298         unsigned char vol_op[4];
 299
 300         int extra_prg = 0;
 301
 302         unsigned short reg_side;
 303         unsigned char op_offset;
 304         unsigned char voice_offset;
 305         unsigned short opl3_reg;
 306         unsigned char reg_val;
 307         unsigned char prg, bank;
 308
 309         int key = note;
 310         unsigned char fnum, blocknum;
 311         int i;
 312
 313         struct fm_patch *patch;
 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
 324         /* in SYNTH mode, application takes care of voices */
 325         /* in SEQ mode, drum voice numbers are notes on drum channel */
 326         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 327                 if (chan->drum_channel) {
 328                         /* percussion instruments are located in bank 128 */
 329                         bank = 128;
 330                         prg = note;
 331                 } else {
 332                         bank = chan->gm_bank_select;
 333                         prg = chan->midi_program;
 334                 }
 335         } else {
 336                 /* Prepare for OSS mode */
 337                 if (chan->number >= MAX_OPL3_VOICES)
 338                         return;
 339
 340                 /* OSS instruments are located in bank 127 */
 341                 bank = 127;
 342                 prg = chan->midi_program;
 343         }
 344
 345         spin_lock_irqsave(&opl3->voice_lock, flags);
 346
 347         if (use_internal_drums) {
 348                 snd_opl3_drum_switch(opl3, note, vel, 1, chan);
 349                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 350                 return;
 351         }
 352
 353  __extra_prg:
 354         patch = snd_opl3_find_patch(opl3, prg, bank, 0);
 355         if (!patch) {
 356                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 357                 return;
 358         }
 359
 360         fm = &patch->inst;
 361         switch (patch->type) {
 362         case FM_PATCH_OPL2:
 363                 instr_4op = 0;
 364                 break;
 365         case FM_PATCH_OPL3:
 366                 if (opl3->hardware >= OPL3_HW_OPL3) {
 367                         instr_4op = 1;
 368                         break;
 369                 }
 370         default:
 371                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
 372                 return;
 373         }
 374 #ifdef DEBUG_MIDI
 375         snd_printk("  --> OPL%i instrument: %s\n",
 376                    instr_4op ? 3 : 2, patch->name);
 377 #endif
 378         /* in SYNTH mode, application takes care of voices */
 379         /* in SEQ mode, allocate voice on free OPL3 channel */
 380         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 381                 voice = opl3_get_voice(opl3, instr_4op, chan);
 382         } else {
 383                 /* remap OSS voice */
 384                 voice = snd_opl3_oss_map[chan->number];
 385         }
 386
 387         if (voice < MAX_OPL2_VOICES) {
 388                 /* Left register block for voices 0 .. 8 */
 389                 reg_side = OPL3_LEFT;
 390                 voice_offset = voice;
 391                 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
 392         } else {
 393                 /* Right register block for voices 9 .. 17 */
 394                 reg_side = OPL3_RIGHT;
 395                 voice_offset = voice - MAX_OPL2_VOICES;
 396                 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
 397         }
 398
 399         /* kill voice on channel */
 400         vp = &opl3->voices[voice];
 401         if (vp->state > 0) {
 402                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 403                 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 404                 opl3->command(opl3, opl3_reg, reg_val);
 405         }
 406         if (instr_4op) {
 407                 vp2 = &opl3->voices[voice + 3];
 408                 if (vp->state > 0) {
 409                         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
 410                                                voice_offset + 3);
 411                         reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
 412                         opl3->command(opl3, opl3_reg, reg_val);
 413                 }
 414         }
 415
 416         /* set connection register */
 417         if (instr_4op) {
 418                 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
 419                         opl3->connection_reg |= connect_mask;
 420                         /* set connection bit */
 421                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 422                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 423                 }
 424         } else {
 425                 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
 426                         opl3->connection_reg &= ~connect_mask;
 427                         /* clear connection bit */
 428                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
 429                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
 430                 }
 431         }
 432
 433 #ifdef DEBUG_MIDI
 434         snd_printk("  --> setting OPL3 connection: 0x%x\n",
 435                    opl3->connection_reg);
 436 #endif
 437         /*
 438          * calculate volume depending on connection
 439          * between FM operators (see include/opl3.h)
 440          */
 441         for (i = 0; i < (instr_4op ? 4 : 2); i++)
 442                 vol_op[i] = fm->op[i].ksl_level;
 443
 444         connection = fm->feedback_connection[0] & 0x01;
 445         if (instr_4op) {
 446                 connection <<= 1;
 447                 connection |= fm->feedback_connection[1] & 0x01;
 448
 449                 snd_opl3_calc_volume(&vol_op[3], vel, chan);
 450                 switch (connection) {
 451                 case 0x03:
 452                         snd_opl3_calc_volume(&vol_op[2], vel, chan);
 453                         /* fallthru */
 454                 case 0x02:
 455                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 456                         break;
 457                 case 0x01:
 458                         snd_opl3_calc_volume(&vol_op[1], vel, chan);
 459                 }
 460         } else {
 461                 snd_opl3_calc_volume(&vol_op[1], vel, chan);
 462                 if (connection)
 463                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
 464         }
 465
 466         /* Program the FM voice characteristics */
 467         for (i = 0; i < (instr_4op ? 4 : 2); i++) {
 468 #ifdef DEBUG_MIDI
 469                 snd_printk("  --> programming operator %i\n", i);
 470 #endif
 471                 op_offset = snd_opl3_regmap[voice_offset][i];
 472
 473                 /* Set OPL3 AM_VIB register of requested voice/operator */
 474                 reg_val = fm->op[i].am_vib;
 475                 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 476                 opl3->command(opl3, opl3_reg, reg_val);
 477
 478                 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 479                 reg_val = vol_op[i];
 480                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 481                 opl3->command(opl3, opl3_reg, reg_val);
 482
 483                 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 484                 reg_val = fm->op[i].attack_decay;
 485                 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 486                 opl3->command(opl3, opl3_reg, reg_val);
 487
 488                 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 489                 reg_val = fm->op[i].sustain_release;
 490                 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 491                 opl3->command(opl3, opl3_reg, reg_val);
 492
 493                 /* Select waveform */
 494                 reg_val = fm->op[i].wave_select;
 495                 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 496                 opl3->command(opl3, opl3_reg, reg_val);
 497         }
 498
 499         /* Set operator feedback and 2op inter-operator connection */
 500         reg_val = fm->feedback_connection[0];
 501         /* Set output voice connection */
 502         reg_val |= OPL3_STEREO_BITS;
 503         if (chan->gm_pan < 43)
 504                 reg_val &= ~OPL3_VOICE_TO_RIGHT;
 505         if (chan->gm_pan > 85)
 506                 reg_val &= ~OPL3_VOICE_TO_LEFT;
 507         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 508         opl3->command(opl3, opl3_reg, reg_val);
 509
 510         if (instr_4op) {
 511                 /* Set 4op inter-operator connection */
 512                 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
 513                 /* Set output voice connection */
 514                 reg_val |= OPL3_STEREO_BITS;
 515                 if (chan->gm_pan < 43)
 516                         reg_val &= ~OPL3_VOICE_TO_RIGHT;
 517                 if (chan->gm_pan > 85)
 518                         reg_val &= ~OPL3_VOICE_TO_LEFT;
 519                 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
 520                                        voice_offset + 3);
 521                 opl3->command(opl3, opl3_reg, reg_val);
 522         }
 523
 524         /*
 525          * Special treatment of percussion notes for fm:
 526          * Requested pitch is really program, and pitch for
 527          * device is whatever was specified in the patch library.
 528          */
 529         if (fm->fix_key)
 530                 note = fm->fix_key;
 531         /*
 532          * use transpose if defined in patch library
 533          */
 534         if (fm->trnsps)
 535                 note += (fm->trnsps - 64);
 536
 537         snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
 538
 539         /* Set OPL3 FNUM_LOW register of requested voice */
 540         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 541         opl3->command(opl3, opl3_reg, fnum);
 542
 543         opl3->voices[voice].keyon_reg = blocknum;
 544
 545         /* Set output sound flag */
 546         blocknum |= OPL3_KEYON_BIT;
 547
 548 #ifdef DEBUG_MIDI
 549         snd_printk("  --> trigger voice %i\n", voice);
 550 #endif
 551         /* Set OPL3 KEYON_BLOCK register of requested voice */
 552         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 553         opl3->command(opl3, opl3_reg, blocknum);
 554
 555         /* kill note after fixed duration (in centiseconds) */
 556         if (fm->fix_dur) {
 557                 opl3->voices[voice].note_off = jiffies +
 558                         (fm->fix_dur * HZ) / 100;
 559                 snd_opl3_start_timer(opl3);
 560                 opl3->voices[voice].note_off_check = 1;
 561         } else
 562                 opl3->voices[voice].note_off_check = 0;
 563
 564         /* get extra pgm, but avoid possible loops */
 565         extra_prg = (extra_prg) ? 0 : fm->modes;
 566
 567         /* do the bookkeeping */
 568         vp->time = opl3->use_time++;
 569         vp->note = key;
 570         vp->chan = chan;
 571
 572         if (instr_4op) {
 573                 vp->state = SNDRV_OPL3_ST_ON_4OP;
 574
 575                 vp2 = &opl3->voices[voice + 3];
 576                 vp2->time = opl3->use_time++;
 577                 vp2->note = key;
 578                 vp2->chan = chan;
 579                 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
 580         } else {
 581                 if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 582                         /* 4op killed by 2op, release bounded voice */
 583                         vp2 = &opl3->voices[voice + 3];
 584                         vp2->time = opl3->use_time++;
 585                         vp2->state = SNDRV_OPL3_ST_OFF;
 586                 }
 587                 vp->state = SNDRV_OPL3_ST_ON_2OP;
 588         }
 589
 590 #ifdef DEBUG_ALLOC
 591         debug_alloc(opl3, "note on ", voice);
 592 #endif
 593
 594         /* allocate extra program if specified in patch library */
 595         if (extra_prg) {
 596                 if (extra_prg > 128) {
 597                         bank = 128;
 598                         /* percussions start at 35 */
 599                         prg = extra_prg - 128 + 35 - 1;
 600                 } else {
 601                         bank = 0;
 602                         prg = extra_prg - 1;
 603                 }
 604 #ifdef DEBUG_MIDI
 605                 snd_printk(" *** allocating extra program\n");
 606 #endif
 607                 goto __extra_prg;
 608         }
 609         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 610 }
 611
 612 static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
 613 {
 614         unsigned short reg_side;
 615         unsigned char voice_offset;
 616         unsigned short opl3_reg;
 617
 618         struct snd_opl3_voice *vp, *vp2;
 619
 620         snd_assert(voice < MAX_OPL3_VOICES, return);
 621
 622         vp = &opl3->voices[voice];
 623         if (voice < MAX_OPL2_VOICES) {
 624                 /* Left register block for voices 0 .. 8 */
 625                 reg_side = OPL3_LEFT;
 626                 voice_offset = voice;
 627         } else {
 628                 /* Right register block for voices 9 .. 17 */
 629                 reg_side = OPL3_RIGHT;
 630                 voice_offset = voice - MAX_OPL2_VOICES;
 631         }
 632
 633         /* kill voice */
 634 #ifdef DEBUG_MIDI
 635         snd_printk("  --> kill voice %i\n", voice);
 636 #endif
 637         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 638         /* clear Key ON bit */
 639         opl3->command(opl3, opl3_reg, vp->keyon_reg);
 640
 641         /* do the bookkeeping */
 642         vp->time = opl3->use_time++;
 643
 644         if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
 645                 vp2 = &opl3->voices[voice + 3];
 646
 647                 vp2->time = opl3->use_time++;
 648                 vp2->state = SNDRV_OPL3_ST_OFF;
 649         }
 650         vp->state = SNDRV_OPL3_ST_OFF;
 651 #ifdef DEBUG_ALLOC
 652         debug_alloc(opl3, "note off", voice);
 653 #endif
 654
 655 }
 656
 657 /*
 658  * Release a note in response to a midi note off.
 659  */
 660 void snd_opl3_note_off(void *p, int note, int vel, struct snd_midi_channel *chan)
 661 {
 662         struct snd_opl3 *opl3;
 663
 664         int voice;
 665         struct snd_opl3_voice *vp;
 666
 667         unsigned long flags;
 668
 669         opl3 = p;
 670
 671 #ifdef DEBUG_MIDI
 672         snd_printk("Note off, ch %i, inst %i, note %i\n",
 673                    chan->number, chan->midi_program, note);
 674 #endif
 675
 676         spin_lock_irqsave(&opl3->voice_lock, flags);
 677
 678         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 679                 if (chan->drum_channel && use_internal_drums) {
 680                         snd_opl3_drum_switch(opl3, note, vel, 0, chan);
 681                         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 682                         return;
 683                 }
 684                 /* this loop will hopefully kill all extra voices, because
 685                    they are grouped by the same channel and note values */
 686                 for (voice = 0; voice < opl3->max_voices; voice++) {
 687                         vp = &opl3->voices[voice];
 688                         if (vp->state > 0 && vp->chan == chan && vp->note == note) {
 689                                 snd_opl3_kill_voice(opl3, voice);
 690                         }
 691                 }
 692         } else {
 693                 /* remap OSS voices */
 694                 if (chan->number < MAX_OPL3_VOICES) {
 695                         voice = snd_opl3_oss_map[chan->number];
 696                         snd_opl3_kill_voice(opl3, voice);
 697                 }
 698         }
 699         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 700 }
 701
 702 /*
 703  * key pressure change
 704  */
 705 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
 706 {
 707         struct snd_opl3 *opl3;
 708
 709         opl3 = p;
 710 #ifdef DEBUG_MIDI
 711         snd_printk("Key pressure, ch#: %i, inst#: %i\n",
 712                    chan->number, chan->midi_program);
 713 #endif
 714 }
 715
 716 /*
 717  * terminate note
 718  */
 719 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
 720 {
 721         struct snd_opl3 *opl3;
 722
 723         opl3 = p;
 724 #ifdef DEBUG_MIDI
 725         snd_printk("Terminate note, ch#: %i, inst#: %i\n",
 726                    chan->number, chan->midi_program);
 727 #endif
 728 }
 729
 730 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
 731 {
 732         unsigned short reg_side;
 733         unsigned char voice_offset;
 734         unsigned short opl3_reg;
 735
 736         unsigned char fnum, blocknum;
 737
 738         struct snd_opl3_voice *vp;
 739
 740         snd_assert(voice < MAX_OPL3_VOICES, return);
 741
 742         vp = &opl3->voices[voice];
 743         if (vp->chan == NULL)
 744                 return; /* not allocated? */
 745
 746         if (voice < MAX_OPL2_VOICES) {
 747                 /* Left register block for voices 0 .. 8 */
 748                 reg_side = OPL3_LEFT;
 749                 voice_offset = voice;
 750         } else {
 751                 /* Right register block for voices 9 .. 17 */
 752                 reg_side = OPL3_RIGHT;
 753                 voice_offset = voice - MAX_OPL2_VOICES;
 754         }
 755
 756         snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
 757
 758         /* Set OPL3 FNUM_LOW register of requested voice */
 759         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 760         opl3->command(opl3, opl3_reg, fnum);
 761
 762         vp->keyon_reg = blocknum;
 763
 764         /* Set output sound flag */
 765         blocknum |= OPL3_KEYON_BIT;
 766
 767         /* Set OPL3 KEYON_BLOCK register of requested voice */
 768         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 769         opl3->command(opl3, opl3_reg, blocknum);
 770
 771         vp->time = opl3->use_time++;
 772 }
 773
 774 /*
 775  * Update voice pitch controller
 776  */
 777 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
 778 {
 779         int voice;
 780         struct snd_opl3_voice *vp;
 781
 782         unsigned long flags;
 783
 784         spin_lock_irqsave(&opl3->voice_lock, flags);
 785
 786         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
 787                 for (voice = 0; voice < opl3->max_voices; voice++) {
 788                         vp = &opl3->voices[voice];
 789                         if (vp->state > 0 && vp->chan == chan) {
 790                                 snd_opl3_update_pitch(opl3, voice);
 791                         }
 792                 }
 793         } else {
 794                 /* remap OSS voices */
 795                 if (chan->number < MAX_OPL3_VOICES) {
 796                         voice = snd_opl3_oss_map[chan->number];
 797                         snd_opl3_update_pitch(opl3, voice);
 798                 }
 799         }
 800         spin_unlock_irqrestore(&opl3->voice_lock, flags);
 801 }
 802
 803 /*
 804  * Deal with a controller type event.  This includes all types of
 805  * control events, not just the midi controllers
 806  */
 807 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
 808 {
 809         struct snd_opl3 *opl3;
 810
 811         opl3 = p;
 812 #ifdef DEBUG_MIDI
 813         snd_printk("Controller, TYPE = %i, ch#: %i, inst#: %i\n",
 814                    type, chan->number, chan->midi_program);
 815 #endif
 816
 817         switch (type) {
 818         case MIDI_CTL_MSB_MODWHEEL:
 819                 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
 820                         opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
 821                 else
 822                         opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
 823                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 824                                  opl3->drum_reg);
 825                 break;
 826         case MIDI_CTL_E2_TREMOLO_DEPTH:
 827                 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
 828                         opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
 829                 else
 830                         opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
 831                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
 832                                  opl3->drum_reg);
 833                 break;
 834         case MIDI_CTL_PITCHBEND:
 835                 snd_opl3_pitch_ctrl(opl3, chan);
 836                 break;
 837         }
 838 }
 839
 840 /*
 841  * NRPN events
 842  */
 843 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
 844                    struct snd_midi_channel_set *chset)
 845 {
 846         struct snd_opl3 *opl3;
 847
 848         opl3 = p;
 849 #ifdef DEBUG_MIDI
 850         snd_printk("NRPN, ch#: %i, inst#: %i\n",
 851                    chan->number, chan->midi_program);
 852 #endif
 853 }
 854
 855 /*
 856  * receive sysex
 857  */
 858 void snd_opl3_sysex(void *p, unsigned char *buf, int len,
 859                     int parsed, struct snd_midi_channel_set *chset)
 860 {
 861         struct snd_opl3 *opl3;
 862
 863         opl3 = p;
 864 #ifdef DEBUG_MIDI
 865         snd_printk("SYSEX\n");
 866 #endif
 867 }