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TOMOYO Linux Cross Reference
Linux/sound/drivers/opl3/opl3_midi.c

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  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 < -0x2000)
109                         pitchbend = -0x2000;
110                 if (pitchbend > 0x1FFF)
111                         pitchbend = 0x1FFF;
112 
113                 segment = pitchbend / 0x1000;
114                 freq = opl3_note_table[idx+segment];
115                 freq += ((opl3_note_table[idx+segment+1] - freq) *
116                          (pitchbend % 0x1000)) / 0x1000;
117         } else {
118                 freq = opl3_note_table[idx];
119         }
120 
121         *fnum = (unsigned char) freq;
122         *blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) |
123                 ((block << 2) & OPL3_BLOCKNUM_MASK);
124 }
125 
126 
127 #ifdef DEBUG_ALLOC
128 static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) {
129         int i;
130         char *str = "x.24";
131 
132         printk(KERN_DEBUG "time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
133         for (i = 0; i < opl3->max_voices; i++)
134                 printk("%c", *(str + opl3->voices[i].state + 1));
135         printk("\n");
136 }
137 #endif
138 
139 /*
140  * Get a FM voice (channel) to play a note on.
141  */
142 static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op,
143                           struct snd_midi_channel *chan) {
144         int chan_4op_1;         /* first voice for 4op instrument */
145         int chan_4op_2;         /* second voice for 4op instrument */
146 
147         struct snd_opl3_voice *vp, *vp2;
148         unsigned int voice_time;
149         int i;
150 
151 #ifdef DEBUG_ALLOC
152         char *alloc_type[3] = { "FREE     ", "CHEAP    ", "EXPENSIVE" };
153 #endif
154 
155         /* This is our "allocation cost" table */
156         enum {
157                 FREE = 0, CHEAP, EXPENSIVE, END
158         };
159 
160         /* Keeps track of what we are finding */
161         struct best {
162                 unsigned int time;
163                 int voice;
164         } best[END];
165         struct best *bp;
166 
167         for (i = 0; i < END; i++) {
168                 best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */
169                 best[i].voice = -1;
170         }
171 
172         /* Look through all the channels for the most suitable. */
173         for (i = 0; i < opl3->max_voices; i++) {
174                 vp = &opl3->voices[i];
175 
176                 if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL)
177                   /* skip unavailable channels, allocated by
178                      drum voices or by bounded 4op voices) */
179                         continue;
180 
181                 voice_time = vp->time;
182                 bp = best;
183 
184                 chan_4op_1 = ((i < 3) || (i > 8 && i < 12));
185                 chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15));
186                 if (instr_4op) {
187                         /* allocate 4op voice */
188                         /* skip channels unavailable to 4op instrument */
189                         if (!chan_4op_1)
190                                 continue;
191 
192                         if (vp->state)
193                                 /* kill one voice, CHEAP */
194                                 bp++;
195                         /* get state of bounded 2op channel
196                            to be allocated for 4op instrument */
197                         vp2 = &opl3->voices[i + 3];
198                         if (vp2->state == SNDRV_OPL3_ST_ON_2OP) {
199                                 /* kill two voices, EXPENSIVE */
200                                 bp++;
201                                 voice_time = (voice_time > vp->time) ?
202                                         voice_time : vp->time;
203                         }
204                 } else {
205                         /* allocate 2op voice */
206                         if ((chan_4op_1) || (chan_4op_2))
207                                 /* use bounded channels for 2op, CHEAP */
208                                 bp++;
209                         else if (vp->state)
210                                 /* kill one voice on 2op channel, CHEAP */
211                                 bp++;
212                         /* raise kill cost to EXPENSIVE for all channels */
213                         if (vp->state)
214                                 bp++;
215                 }
216                 if (voice_time < bp->time) {
217                         bp->time = voice_time;
218                         bp->voice = i;
219                 }
220         }
221 
222         for (i = 0; i < END; i++) {
223                 if (best[i].voice >= 0) {
224 #ifdef DEBUG_ALLOC
225                         printk(KERN_DEBUG "%s %iop allocation on voice %i\n",
226                                alloc_type[i], instr_4op ? 4 : 2,
227                                best[i].voice);
228 #endif
229                         return best[i].voice;
230                 }
231         }
232         /* not found */
233         return -1;
234 }
235 
236 /* ------------------------------ */
237 
238 /*
239  * System timer interrupt function
240  */
241 void snd_opl3_timer_func(unsigned long data)
242 {
243 
244         struct snd_opl3 *opl3 = (struct snd_opl3 *)data;
245         unsigned long flags;
246         int again = 0;
247         int i;
248 
249         spin_lock_irqsave(&opl3->voice_lock, flags);
250         for (i = 0; i < opl3->max_voices; i++) {
251                 struct snd_opl3_voice *vp = &opl3->voices[i];
252                 if (vp->state > 0 && vp->note_off_check) {
253                         if (vp->note_off == jiffies)
254                                 snd_opl3_note_off_unsafe(opl3, vp->note, 0,
255                                                          vp->chan);
256                         else
257                                 again++;
258                 }
259         }
260         spin_unlock_irqrestore(&opl3->voice_lock, flags);
261 
262         spin_lock_irqsave(&opl3->sys_timer_lock, flags);
263         if (again)
264                 mod_timer(&opl3->tlist, jiffies + 1);   /* invoke again */
265         else
266                 opl3->sys_timer_status = 0;
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                 mod_timer(&opl3->tlist, jiffies + 1);
279                 opl3->sys_timer_status = 1;
280         }
281         spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
282 }
283 
284 /* ------------------------------ */
285 
286 
287 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
288         0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
289 };
290 
291 /*
292  * Start a note.
293  */
294 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
295 {
296         struct snd_opl3 *opl3;
297         int instr_4op;
298 
299         int voice;
300         struct snd_opl3_voice *vp, *vp2;
301         unsigned short connect_mask;
302         unsigned char connection;
303         unsigned char vol_op[4];
304 
305         int extra_prg = 0;
306 
307         unsigned short reg_side;
308         unsigned char op_offset;
309         unsigned char voice_offset;
310         unsigned short opl3_reg;
311         unsigned char reg_val;
312         unsigned char prg, bank;
313 
314         int key = note;
315         unsigned char fnum, blocknum;
316         int i;
317 
318         struct fm_patch *patch;
319         struct fm_instrument *fm;
320         unsigned long flags;
321 
322         opl3 = p;
323 
324 #ifdef DEBUG_MIDI
325         snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
326                    chan->number, chan->midi_program, note, vel);
327 #endif
328 
329         /* in SYNTH mode, application takes care of voices */
330         /* in SEQ mode, drum voice numbers are notes on drum channel */
331         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
332                 if (chan->drum_channel) {
333                         /* percussion instruments are located in bank 128 */
334                         bank = 128;
335                         prg = note;
336                 } else {
337                         bank = chan->gm_bank_select;
338                         prg = chan->midi_program;
339                 }
340         } else {
341                 /* Prepare for OSS mode */
342                 if (chan->number >= MAX_OPL3_VOICES)
343                         return;
344 
345                 /* OSS instruments are located in bank 127 */
346                 bank = 127;
347                 prg = chan->midi_program;
348         }
349 
350         spin_lock_irqsave(&opl3->voice_lock, flags);
351 
352         if (use_internal_drums) {
353                 snd_opl3_drum_switch(opl3, note, vel, 1, chan);
354                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
355                 return;
356         }
357 
358  __extra_prg:
359         patch = snd_opl3_find_patch(opl3, prg, bank, 0);
360         if (!patch) {
361                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
362                 return;
363         }
364 
365         fm = &patch->inst;
366         switch (patch->type) {
367         case FM_PATCH_OPL2:
368                 instr_4op = 0;
369                 break;
370         case FM_PATCH_OPL3:
371                 if (opl3->hardware >= OPL3_HW_OPL3) {
372                         instr_4op = 1;
373                         break;
374                 }
375         default:
376                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
377                 return;
378         }
379 #ifdef DEBUG_MIDI
380         snd_printk(KERN_DEBUG "  --> OPL%i instrument: %s\n",
381                    instr_4op ? 3 : 2, patch->name);
382 #endif
383         /* in SYNTH mode, application takes care of voices */
384         /* in SEQ mode, allocate voice on free OPL3 channel */
385         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
386                 voice = opl3_get_voice(opl3, instr_4op, chan);
387         } else {
388                 /* remap OSS voice */
389                 voice = snd_opl3_oss_map[chan->number];         
390         }
391 
392         if (voice < 0) {
393                 spin_unlock_irqrestore(&opl3->voice_lock, flags);
394                 return;
395         }
396 
397         if (voice < MAX_OPL2_VOICES) {
398                 /* Left register block for voices 0 .. 8 */
399                 reg_side = OPL3_LEFT;
400                 voice_offset = voice;
401                 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
402         } else {
403                 /* Right register block for voices 9 .. 17 */
404                 reg_side = OPL3_RIGHT;
405                 voice_offset = voice - MAX_OPL2_VOICES;
406                 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
407         }
408 
409         /* kill voice on channel */
410         vp = &opl3->voices[voice];
411         if (vp->state > 0) {
412                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
413                 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
414                 opl3->command(opl3, opl3_reg, reg_val);
415         }
416         if (instr_4op) {
417                 vp2 = &opl3->voices[voice + 3];
418                 if (vp->state > 0) {
419                         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
420                                                voice_offset + 3);
421                         reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
422                         opl3->command(opl3, opl3_reg, reg_val);
423                 }
424         }
425 
426         /* set connection register */
427         if (instr_4op) {
428                 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
429                         opl3->connection_reg |= connect_mask;
430                         /* set connection bit */
431                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
432                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
433                 }
434         } else {
435                 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
436                         opl3->connection_reg &= ~connect_mask;
437                         /* clear connection bit */
438                         opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
439                         opl3->command(opl3, opl3_reg, opl3->connection_reg);
440                 }
441         }
442 
443 #ifdef DEBUG_MIDI
444         snd_printk(KERN_DEBUG "  --> setting OPL3 connection: 0x%x\n",
445                    opl3->connection_reg);
446 #endif
447         /*
448          * calculate volume depending on connection
449          * between FM operators (see include/opl3.h)
450          */
451         for (i = 0; i < (instr_4op ? 4 : 2); i++)
452                 vol_op[i] = fm->op[i].ksl_level;
453 
454         connection = fm->feedback_connection[0] & 0x01;
455         if (instr_4op) {
456                 connection <<= 1;
457                 connection |= fm->feedback_connection[1] & 0x01;
458 
459                 snd_opl3_calc_volume(&vol_op[3], vel, chan);
460                 switch (connection) {
461                 case 0x03:
462                         snd_opl3_calc_volume(&vol_op[2], vel, chan);
463                         /* fallthru */
464                 case 0x02:
465                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
466                         break;
467                 case 0x01:
468                         snd_opl3_calc_volume(&vol_op[1], vel, chan);
469                 }
470         } else {
471                 snd_opl3_calc_volume(&vol_op[1], vel, chan);
472                 if (connection)
473                         snd_opl3_calc_volume(&vol_op[0], vel, chan);
474         }
475 
476         /* Program the FM voice characteristics */
477         for (i = 0; i < (instr_4op ? 4 : 2); i++) {
478 #ifdef DEBUG_MIDI
479                 snd_printk(KERN_DEBUG "  --> programming operator %i\n", i);
480 #endif
481                 op_offset = snd_opl3_regmap[voice_offset][i];
482 
483                 /* Set OPL3 AM_VIB register of requested voice/operator */ 
484                 reg_val = fm->op[i].am_vib;
485                 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
486                 opl3->command(opl3, opl3_reg, reg_val);
487 
488                 /* Set OPL3 KSL_LEVEL register of requested voice/operator */ 
489                 reg_val = vol_op[i];
490                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
491                 opl3->command(opl3, opl3_reg, reg_val);
492 
493                 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */ 
494                 reg_val = fm->op[i].attack_decay;
495                 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
496                 opl3->command(opl3, opl3_reg, reg_val);
497 
498                 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */ 
499                 reg_val = fm->op[i].sustain_release;
500                 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
501                 opl3->command(opl3, opl3_reg, reg_val);
502 
503                 /* Select waveform */
504                 reg_val = fm->op[i].wave_select;
505                 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
506                 opl3->command(opl3, opl3_reg, reg_val);
507         }
508 
509         /* Set operator feedback and 2op inter-operator connection */
510         reg_val = fm->feedback_connection[0];
511         /* Set output voice connection */
512         reg_val |= OPL3_STEREO_BITS;
513         if (chan->gm_pan < 43)
514                 reg_val &= ~OPL3_VOICE_TO_RIGHT;
515         if (chan->gm_pan > 85)
516                 reg_val &= ~OPL3_VOICE_TO_LEFT;
517         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
518         opl3->command(opl3, opl3_reg, reg_val);
519 
520         if (instr_4op) {
521                 /* Set 4op inter-operator connection */
522                 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
523                 /* Set output voice connection */
524                 reg_val |= OPL3_STEREO_BITS;
525                 if (chan->gm_pan < 43)
526                         reg_val &= ~OPL3_VOICE_TO_RIGHT;
527                 if (chan->gm_pan > 85)
528                         reg_val &= ~OPL3_VOICE_TO_LEFT;
529                 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
530                                        voice_offset + 3);
531                 opl3->command(opl3, opl3_reg, reg_val);
532         }
533 
534         /*
535          * Special treatment of percussion notes for fm:
536          * Requested pitch is really program, and pitch for
537          * device is whatever was specified in the patch library.
538          */
539         if (fm->fix_key)
540                 note = fm->fix_key;
541         /*
542          * use transpose if defined in patch library
543          */
544         if (fm->trnsps)
545                 note += (fm->trnsps - 64);
546 
547         snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
548 
549         /* Set OPL3 FNUM_LOW register of requested voice */
550         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
551         opl3->command(opl3, opl3_reg, fnum);
552 
553         opl3->voices[voice].keyon_reg = blocknum;
554 
555         /* Set output sound flag */
556         blocknum |= OPL3_KEYON_BIT;
557 
558 #ifdef DEBUG_MIDI
559         snd_printk(KERN_DEBUG "  --> trigger voice %i\n", voice);
560 #endif
561         /* Set OPL3 KEYON_BLOCK register of requested voice */ 
562         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
563         opl3->command(opl3, opl3_reg, blocknum);
564 
565         /* kill note after fixed duration (in centiseconds) */
566         if (fm->fix_dur) {
567                 opl3->voices[voice].note_off = jiffies +
568                         (fm->fix_dur * HZ) / 100;
569                 snd_opl3_start_timer(opl3);
570                 opl3->voices[voice].note_off_check = 1;
571         } else
572                 opl3->voices[voice].note_off_check = 0;
573 
574         /* get extra pgm, but avoid possible loops */
575         extra_prg = (extra_prg) ? 0 : fm->modes;
576 
577         /* do the bookkeeping */
578         vp->time = opl3->use_time++;
579         vp->note = key;
580         vp->chan = chan;
581 
582         if (instr_4op) {
583                 vp->state = SNDRV_OPL3_ST_ON_4OP;
584 
585                 vp2 = &opl3->voices[voice + 3];
586                 vp2->time = opl3->use_time++;
587                 vp2->note = key;
588                 vp2->chan = chan;
589                 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
590         } else {
591                 if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
592                         /* 4op killed by 2op, release bounded voice */
593                         vp2 = &opl3->voices[voice + 3];
594                         vp2->time = opl3->use_time++;
595                         vp2->state = SNDRV_OPL3_ST_OFF;
596                 }
597                 vp->state = SNDRV_OPL3_ST_ON_2OP;
598         }
599 
600 #ifdef DEBUG_ALLOC
601         debug_alloc(opl3, "note on ", voice);
602 #endif
603 
604         /* allocate extra program if specified in patch library */
605         if (extra_prg) {
606                 if (extra_prg > 128) {
607                         bank = 128;
608                         /* percussions start at 35 */
609                         prg = extra_prg - 128 + 35 - 1;
610                 } else {
611                         bank = 0;
612                         prg = extra_prg - 1;
613                 }
614 #ifdef DEBUG_MIDI
615                 snd_printk(KERN_DEBUG " *** allocating extra program\n");
616 #endif
617                 goto __extra_prg;
618         }
619         spin_unlock_irqrestore(&opl3->voice_lock, flags);
620 }
621 
622 static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
623 {
624         unsigned short reg_side;
625         unsigned char voice_offset;
626         unsigned short opl3_reg;
627 
628         struct snd_opl3_voice *vp, *vp2;
629 
630         if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
631                 return;
632 
633         vp = &opl3->voices[voice];
634         if (voice < MAX_OPL2_VOICES) {
635                 /* Left register block for voices 0 .. 8 */
636                 reg_side = OPL3_LEFT;
637                 voice_offset = voice;
638         } else {
639                 /* Right register block for voices 9 .. 17 */
640                 reg_side = OPL3_RIGHT;
641                 voice_offset = voice - MAX_OPL2_VOICES;
642         }
643 
644         /* kill voice */
645 #ifdef DEBUG_MIDI
646         snd_printk(KERN_DEBUG "  --> kill voice %i\n", voice);
647 #endif
648         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
649         /* clear Key ON bit */
650         opl3->command(opl3, opl3_reg, vp->keyon_reg);
651 
652         /* do the bookkeeping */
653         vp->time = opl3->use_time++;
654 
655         if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
656                 vp2 = &opl3->voices[voice + 3];
657 
658                 vp2->time = opl3->use_time++;
659                 vp2->state = SNDRV_OPL3_ST_OFF;
660         }
661         vp->state = SNDRV_OPL3_ST_OFF;
662 #ifdef DEBUG_ALLOC
663         debug_alloc(opl3, "note off", voice);
664 #endif
665 
666 }
667 
668 /*
669  * Release a note in response to a midi note off.
670  */
671 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
672                                      struct snd_midi_channel *chan)
673 {
674         struct snd_opl3 *opl3;
675 
676         int voice;
677         struct snd_opl3_voice *vp;
678 
679         opl3 = p;
680 
681 #ifdef DEBUG_MIDI
682         snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
683                    chan->number, chan->midi_program, note);
684 #endif
685 
686         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
687                 if (chan->drum_channel && use_internal_drums) {
688                         snd_opl3_drum_switch(opl3, note, vel, 0, chan);
689                         return;
690                 }
691                 /* this loop will hopefully kill all extra voices, because
692                    they are grouped by the same channel and note values */
693                 for (voice = 0; voice < opl3->max_voices; voice++) {
694                         vp = &opl3->voices[voice];
695                         if (vp->state > 0 && vp->chan == chan && vp->note == note) {
696                                 snd_opl3_kill_voice(opl3, voice);
697                         }
698                 }
699         } else {
700                 /* remap OSS voices */
701                 if (chan->number < MAX_OPL3_VOICES) {
702                         voice = snd_opl3_oss_map[chan->number];         
703                         snd_opl3_kill_voice(opl3, voice);
704                 }
705         }
706 }
707 
708 void snd_opl3_note_off(void *p, int note, int vel,
709                        struct snd_midi_channel *chan)
710 {
711         struct snd_opl3 *opl3 = p;
712         unsigned long flags;
713 
714         spin_lock_irqsave(&opl3->voice_lock, flags);
715         snd_opl3_note_off_unsafe(p, note, vel, chan);
716         spin_unlock_irqrestore(&opl3->voice_lock, flags);
717 }
718 
719 /*
720  * key pressure change
721  */
722 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
723 {
724         struct snd_opl3 *opl3;
725 
726         opl3 = p;
727 #ifdef DEBUG_MIDI
728         snd_printk(KERN_DEBUG "Key pressure, ch#: %i, inst#: %i\n",
729                    chan->number, chan->midi_program);
730 #endif
731 }
732 
733 /*
734  * terminate note
735  */
736 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
737 {
738         struct snd_opl3 *opl3;
739 
740         opl3 = p;
741 #ifdef DEBUG_MIDI
742         snd_printk(KERN_DEBUG "Terminate note, ch#: %i, inst#: %i\n",
743                    chan->number, chan->midi_program);
744 #endif
745 }
746 
747 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
748 {
749         unsigned short reg_side;
750         unsigned char voice_offset;
751         unsigned short opl3_reg;
752 
753         unsigned char fnum, blocknum;
754 
755         struct snd_opl3_voice *vp;
756 
757         if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
758                 return;
759 
760         vp = &opl3->voices[voice];
761         if (vp->chan == NULL)
762                 return; /* not allocated? */
763 
764         if (voice < MAX_OPL2_VOICES) {
765                 /* Left register block for voices 0 .. 8 */
766                 reg_side = OPL3_LEFT;
767                 voice_offset = voice;
768         } else {
769                 /* Right register block for voices 9 .. 17 */
770                 reg_side = OPL3_RIGHT;
771                 voice_offset = voice - MAX_OPL2_VOICES;
772         }
773 
774         snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
775 
776         /* Set OPL3 FNUM_LOW register of requested voice */
777         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
778         opl3->command(opl3, opl3_reg, fnum);
779 
780         vp->keyon_reg = blocknum;
781 
782         /* Set output sound flag */
783         blocknum |= OPL3_KEYON_BIT;
784 
785         /* Set OPL3 KEYON_BLOCK register of requested voice */ 
786         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
787         opl3->command(opl3, opl3_reg, blocknum);
788 
789         vp->time = opl3->use_time++;
790 }
791 
792 /*
793  * Update voice pitch controller
794  */
795 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
796 {
797         int voice;
798         struct snd_opl3_voice *vp;
799 
800         unsigned long flags;
801 
802         spin_lock_irqsave(&opl3->voice_lock, flags);
803 
804         if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
805                 for (voice = 0; voice < opl3->max_voices; voice++) {
806                         vp = &opl3->voices[voice];
807                         if (vp->state > 0 && vp->chan == chan) {
808                                 snd_opl3_update_pitch(opl3, voice);
809                         }
810                 }
811         } else {
812                 /* remap OSS voices */
813                 if (chan->number < MAX_OPL3_VOICES) {
814                         voice = snd_opl3_oss_map[chan->number];         
815                         snd_opl3_update_pitch(opl3, voice);
816                 }
817         }
818         spin_unlock_irqrestore(&opl3->voice_lock, flags);
819 }
820 
821 /*
822  * Deal with a controller type event.  This includes all types of
823  * control events, not just the midi controllers
824  */
825 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
826 {
827         struct snd_opl3 *opl3;
828 
829         opl3 = p;
830 #ifdef DEBUG_MIDI
831         snd_printk(KERN_DEBUG "Controller, TYPE = %i, ch#: %i, inst#: %i\n",
832                    type, chan->number, chan->midi_program);
833 #endif
834 
835         switch (type) {
836         case MIDI_CTL_MSB_MODWHEEL:
837                 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
838                         opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
839                 else 
840                         opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
841                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
842                                  opl3->drum_reg);
843                 break;
844         case MIDI_CTL_E2_TREMOLO_DEPTH:
845                 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
846                         opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
847                 else 
848                         opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
849                 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
850                                  opl3->drum_reg);
851                 break;
852         case MIDI_CTL_PITCHBEND:
853                 snd_opl3_pitch_ctrl(opl3, chan);
854                 break;
855         }
856 }
857 
858 /*
859  * NRPN events
860  */
861 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
862                    struct snd_midi_channel_set *chset)
863 {
864         struct snd_opl3 *opl3;
865 
866         opl3 = p;
867 #ifdef DEBUG_MIDI
868         snd_printk(KERN_DEBUG "NRPN, ch#: %i, inst#: %i\n",
869                    chan->number, chan->midi_program);
870 #endif
871 }
872 
873 /*
874  * receive sysex
875  */
876 void snd_opl3_sysex(void *p, unsigned char *buf, int len,
877                     int parsed, struct snd_midi_channel_set *chset)
878 {
879         struct snd_opl3 *opl3;
880 
881         opl3 = p;
882 #ifdef DEBUG_MIDI
883         snd_printk(KERN_DEBUG "SYSEX\n");
884 #endif
885 }
886 

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