]> nv-tegra.nvidia Code Review - linux-3.10.git/blob - sound/drivers/opl3/opl3_midi.c
[ALSA] Remove xxx_t typedefs: OPL3
[linux-3.10.git] / 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         int again = 0;
242         int i;
243
244         spin_lock(&opl3->sys_timer_lock);
245         for (i = 0; i < opl3->max_voices; i++) {
246                 struct snd_opl3_voice *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(struct snd_opl3 *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, struct snd_midi_channel *chan)
289 {
290         struct snd_opl3 *opl3;
291         struct snd_seq_instr wanted;
292         struct snd_seq_kinstr *kinstr;
293         int instr_4op;
294
295         int voice;
296         struct snd_opl3_voice *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         struct fm_instrument *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(struct snd_opl3 *opl3, int voice)
619 {
620         unsigned short reg_side;
621         unsigned char voice_offset;
622         unsigned short opl3_reg;
623
624         struct snd_opl3_voice *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, struct snd_midi_channel *chan)
667 {
668         struct snd_opl3 *opl3;
669
670         int voice;
671         struct snd_opl3_voice *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, struct snd_midi_channel *chan)
712 {
713         struct snd_opl3 *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, struct snd_midi_channel *chan)
726 {
727         struct snd_opl3 *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(struct snd_opl3 *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         struct snd_opl3_voice *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(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
784 {
785         int voice;
786         struct snd_opl3_voice *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, struct snd_midi_channel *chan)
814 {
815         struct snd_opl3 *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, struct snd_midi_channel *chan,
850                    struct snd_midi_channel_set *chset)
851 {
852         struct snd_opl3 *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, struct snd_midi_channel_set *chset)
866 {
867         struct snd_opl3 *opl3;
868
869         opl3 = p;
870 #ifdef DEBUG_MIDI
871         snd_printk("SYSEX\n");
872 #endif
873 }