?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / sound / oss / sequencer.c
blob5c215f787ca9340e5cb2ad33da47c9658bb2dfcc
1 /*
2 * sound/oss/sequencer.c
3 *
4 * The sequencer personality manager.
5 */
6 /*
7 * Copyright (C) by Hannu Savolainen 1993-1997
8 *
9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
11 * for more info.
12 */
13 /*
14 * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
15 * Alan Cox : reformatted and fixed a pair of null pointer bugs
16 */
17 #include <linux/kmod.h>
18 #include <linux/spinlock.h>
19 #include "sound_config.h"
20
21 #include "midi_ctrl.h"
22
23 static int sequencer_ok;
24 static struct sound_timer_operations *tmr;
25 static int tmr_no = -1; /* Currently selected timer */
26 static int pending_timer = -1; /* For timer change operation */
27 extern unsigned long seq_time;
28
29 static int obsolete_api_used;
30 static DEFINE_SPINLOCK(lock);
31
32 /*
33 * Local counts for number of synth and MIDI devices. These are initialized
34 * by the sequencer_open.
35 */
36 static int max_mididev;
37 static int max_synthdev;
38
39 /*
40 * The seq_mode gives the operating mode of the sequencer:
41 * 1 = level1 (the default)
42 * 2 = level2 (extended capabilities)
43 */
44
45 #define SEQ_1 1
46 #define SEQ_2 2
47 static int seq_mode = SEQ_1;
48
49 static DECLARE_WAIT_QUEUE_HEAD(seq_sleeper);
50 static DECLARE_WAIT_QUEUE_HEAD(midi_sleeper);
51
52 static int midi_opened[MAX_MIDI_DEV];
53
54 static int midi_written[MAX_MIDI_DEV];
55
56 static unsigned long prev_input_time;
57 static int prev_event_time;
58
59 #include "tuning.h"
60
61 #define EV_SZ 8
62 #define IEV_SZ 8
63
64 static unsigned char *queue;
65 static unsigned char *iqueue;
66
67 static volatile int qhead, qtail, qlen;
68 static volatile int iqhead, iqtail, iqlen;
69 static volatile int seq_playing;
70 static volatile int sequencer_busy;
71 static int output_threshold;
72 static long pre_event_timeout;
73 static unsigned synth_open_mask;
74
75 static int seq_queue(unsigned char *note, char nonblock);
76 static void seq_startplay(void);
77 static int seq_sync(void);
78 static void seq_reset(void);
79
80 #if MAX_SYNTH_DEV > 15
81 #error Too many synthesizer devices enabled.
82 #endif
83
84 int sequencer_read(int dev, struct file *file, char __user *buf, int count)
85 {
86 int c = count, p = 0;
87 int ev_len;
88 unsigned long flags;
89
90 dev = dev >> 4;
91
92 ev_len = seq_mode == SEQ_1 ? 4 : 8;
93
94 spin_lock_irqsave(&lock,flags);
95
96 if (!iqlen)
97 {
98 spin_unlock_irqrestore(&lock,flags);
99 if (file->f_flags & O_NONBLOCK) {
100 return -EAGAIN;
101 }
102
103 interruptible_sleep_on_timeout(&midi_sleeper,
104 pre_event_timeout);
105 spin_lock_irqsave(&lock,flags);
106 if (!iqlen)
107 {
108 spin_unlock_irqrestore(&lock,flags);
109 return 0;
110 }
111 }
112 while (iqlen && c >= ev_len)
113 {
114 char *fixit = (char *) &iqueue[iqhead * IEV_SZ];
115 spin_unlock_irqrestore(&lock,flags);
116 if (copy_to_user(&(buf)[p], fixit, ev_len))
117 return count - c;
118 p += ev_len;
119 c -= ev_len;
120
121 spin_lock_irqsave(&lock,flags);
122 iqhead = (iqhead + 1) % SEQ_MAX_QUEUE;
123 iqlen--;
124 }
125 spin_unlock_irqrestore(&lock,flags);
126 return count - c;
127 }
128
129 static void sequencer_midi_output(int dev)
130 {
131 /*
132 * Currently NOP
133 */
134 }
135
136 void seq_copy_to_input(unsigned char *event_rec, int len)
137 {
138 unsigned long flags;
139
140 /*
141 * Verify that the len is valid for the current mode.
142 */
143
144 if (len != 4 && len != 8)
145 return;
146 if ((seq_mode == SEQ_1) != (len == 4))
147 return;
148
149 if (iqlen >= (SEQ_MAX_QUEUE - 1))
150 return; /* Overflow */
151
152 spin_lock_irqsave(&lock,flags);
153 memcpy(&iqueue[iqtail * IEV_SZ], event_rec, len);
154 iqlen++;
155 iqtail = (iqtail + 1) % SEQ_MAX_QUEUE;
156 wake_up(&midi_sleeper);
157 spin_unlock_irqrestore(&lock,flags);
158 }
159 EXPORT_SYMBOL(seq_copy_to_input);
160
161 static void sequencer_midi_input(int dev, unsigned char data)
162 {
163 unsigned int tstamp;
164 unsigned char event_rec[4];
165
166 if (data == 0xfe) /* Ignore active sensing */
167 return;
168
169 tstamp = jiffies - seq_time;
170
171 if (tstamp != prev_input_time)
172 {
173 tstamp = (tstamp << 8) | SEQ_WAIT;
174 seq_copy_to_input((unsigned char *) &tstamp, 4);
175 prev_input_time = tstamp;
176 }
177 event_rec[0] = SEQ_MIDIPUTC;
178 event_rec[1] = data;
179 event_rec[2] = dev;
180 event_rec[3] = 0;
181
182 seq_copy_to_input(event_rec, 4);
183 }
184
185 void seq_input_event(unsigned char *event_rec, int len)
186 {
187 unsigned long this_time;
188
189 if (seq_mode == SEQ_2)
190 this_time = tmr->get_time(tmr_no);
191 else
192 this_time = jiffies - seq_time;
193
194 if (this_time != prev_input_time)
195 {
196 unsigned char tmp_event[8];
197
198 tmp_event[0] = EV_TIMING;
199 tmp_event[1] = TMR_WAIT_ABS;
200 tmp_event[2] = 0;
201 tmp_event[3] = 0;
202 *(unsigned int *) &tmp_event[4] = this_time;
203
204 seq_copy_to_input(tmp_event, 8);
205 prev_input_time = this_time;
206 }
207 seq_copy_to_input(event_rec, len);
208 }
209 EXPORT_SYMBOL(seq_input_event);
210
211 int sequencer_write(int dev, struct file *file, const char __user *buf, int count)
212 {
213 unsigned char event_rec[EV_SZ], ev_code;
214 int p = 0, c, ev_size;
215 int err;
216 int mode = translate_mode(file);
217
218 dev = dev >> 4;
219
220 DEB(printk("sequencer_write(dev=%d, count=%d)\n", dev, count));
221
222 if (mode == OPEN_READ)
223 return -EIO;
224
225 c = count;
226
227 while (c >= 4)
228 {
229 if (copy_from_user((char *) event_rec, &(buf)[p], 4))
230 goto out;
231 ev_code = event_rec[0];
232
233 if (ev_code == SEQ_FULLSIZE)
234 {
235 int err, fmt;
236
237 dev = *(unsigned short *) &event_rec[2];
238 if (dev < 0 || dev >= max_synthdev || synth_devs[dev] == NULL)
239 return -ENXIO;
240
241 if (!(synth_open_mask & (1 << dev)))
242 return -ENXIO;
243
244 fmt = (*(short *) &event_rec[0]) & 0xffff;
245 err = synth_devs[dev]->load_patch(dev, fmt, buf, p + 4, c, 0);
246 if (err < 0)
247 return err;
248
249 return err;
250 }
251 if (ev_code >= 128)
252 {
253 if (seq_mode == SEQ_2 && ev_code == SEQ_EXTENDED)
254 {
255 printk(KERN_WARNING "Sequencer: Invalid level 2 event %x\n", ev_code);
256 return -EINVAL;
257 }
258 ev_size = 8;
259
260 if (c < ev_size)
261 {
262 if (!seq_playing)
263 seq_startplay();
264 return count - c;
265 }
266 if (copy_from_user((char *)&event_rec[4],
267 &(buf)[p + 4], 4))
268 goto out;
269
270 }
271 else
272 {
273 if (seq_mode == SEQ_2)
274 {
275 printk(KERN_WARNING "Sequencer: 4 byte event in level 2 mode\n");
276 return -EINVAL;
277 }
278 ev_size = 4;
279
280 if (event_rec[0] != SEQ_MIDIPUTC)
281 obsolete_api_used = 1;
282 }
283
284 if (event_rec[0] == SEQ_MIDIPUTC)
285 {
286 if (!midi_opened[event_rec[2]])
287 {
288 int mode;
289 int dev = event_rec[2];
290
291 if (dev >= max_mididev || midi_devs[dev]==NULL)
292 {
293 /*printk("Sequencer Error: Nonexistent MIDI device %d\n", dev);*/
294 return -ENXIO;
295 }
296 mode = translate_mode(file);
297
298 if ((err = midi_devs[dev]->open(dev, mode,
299 sequencer_midi_input, sequencer_midi_output)) < 0)
300 {
301 seq_reset();
302 printk(KERN_WARNING "Sequencer Error: Unable to open Midi #%d\n", dev);
303 return err;
304 }
305 midi_opened[dev] = 1;
306 }
307 }
308 if (!seq_queue(event_rec, (file->f_flags & (O_NONBLOCK) ? 1 : 0)))
309 {
310 int processed = count - c;
311
312 if (!seq_playing)
313 seq_startplay();
314
315 if (!processed && (file->f_flags & O_NONBLOCK))
316 return -EAGAIN;
317 else
318 return processed;
319 }
320 p += ev_size;
321 c -= ev_size;
322 }
323
324 if (!seq_playing)
325 seq_startplay();
326 out:
327 return count;
328 }
329
330 static int seq_queue(unsigned char *note, char nonblock)
331 {
332
333 /*
334 * Test if there is space in the queue
335 */
336
337 if (qlen >= SEQ_MAX_QUEUE)
338 if (!seq_playing)
339 seq_startplay(); /*
340 * Give chance to drain the queue
341 */
342
343 if (!nonblock && qlen >= SEQ_MAX_QUEUE && !waitqueue_active(&seq_sleeper)) {
344 /*
345 * Sleep until there is enough space on the queue
346 */
347 interruptible_sleep_on(&seq_sleeper);
348 }
349 if (qlen >= SEQ_MAX_QUEUE)
350 {
351 return 0; /*
352 * To be sure
353 */
354 }
355 memcpy(&queue[qtail * EV_SZ], note, EV_SZ);
356
357 qtail = (qtail + 1) % SEQ_MAX_QUEUE;
358 qlen++;
359
360 return 1;
361 }
362
363 static int extended_event(unsigned char *q)
364 {
365 int dev = q[2];
366
367 if (dev < 0 || dev >= max_synthdev)
368 return -ENXIO;
369
370 if (!(synth_open_mask & (1 << dev)))
371 return -ENXIO;
372
373 switch (q[1])
374 {
375 case SEQ_NOTEOFF:
376 synth_devs[dev]->kill_note(dev, q[3], q[4], q[5]);
377 break;
378
379 case SEQ_NOTEON:
380 if (q[4] > 127 && q[4] != 255)
381 return 0;
382
383 if (q[5] == 0)
384 {
385 synth_devs[dev]->kill_note(dev, q[3], q[4], q[5]);
386 break;
387 }
388 synth_devs[dev]->start_note(dev, q[3], q[4], q[5]);
389 break;
390
391 case SEQ_PGMCHANGE:
392 synth_devs[dev]->set_instr(dev, q[3], q[4]);
393 break;
394
395 case SEQ_AFTERTOUCH:
396 synth_devs[dev]->aftertouch(dev, q[3], q[4]);
397 break;
398
399 case SEQ_BALANCE:
400 synth_devs[dev]->panning(dev, q[3], (char) q[4]);
401 break;
402
403 case SEQ_CONTROLLER:
404 synth_devs[dev]->controller(dev, q[3], q[4], (short) (q[5] | (q[6] << 8)));
405 break;
406
407 case SEQ_VOLMODE:
408 if (synth_devs[dev]->volume_method != NULL)
409 synth_devs[dev]->volume_method(dev, q[3]);
410 break;
411
412 default:
413 return -EINVAL;
414 }
415 return 0;
416 }
417
418 static int find_voice(int dev, int chn, int note)
419 {
420 unsigned short key;
421 int i;
422
423 key = (chn << 8) | (note + 1);
424 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
425 if (synth_devs[dev]->alloc.map[i] == key)
426 return i;
427 return -1;
428 }
429
430 static int alloc_voice(int dev, int chn, int note)
431 {
432 unsigned short key;
433 int voice;
434
435 key = (chn << 8) | (note + 1);
436
437 voice = synth_devs[dev]->alloc_voice(dev, chn, note,
438 &synth_devs[dev]->alloc);
439 synth_devs[dev]->alloc.map[voice] = key;
440 synth_devs[dev]->alloc.alloc_times[voice] =
441 synth_devs[dev]->alloc.timestamp++;
442 return voice;
443 }
444
445 static void seq_chn_voice_event(unsigned char *event_rec)
446 {
447 #define dev event_rec[1]
448 #define cmd event_rec[2]
449 #define chn event_rec[3]
450 #define note event_rec[4]
451 #define parm event_rec[5]
452
453 int voice = -1;
454
455 if ((int) dev > max_synthdev || synth_devs[dev] == NULL)
456 return;
457 if (!(synth_open_mask & (1 << dev)))
458 return;
459 if (!synth_devs[dev])
460 return;
461
462 if (seq_mode == SEQ_2)
463 {
464 if (synth_devs[dev]->alloc_voice)
465 voice = find_voice(dev, chn, note);
466
467 if (cmd == MIDI_NOTEON && parm == 0)
468 {
469 cmd = MIDI_NOTEOFF;
470 parm = 64;
471 }
472 }
473
474 switch (cmd)
475 {
476 case MIDI_NOTEON:
477 if (note > 127 && note != 255) /* Not a seq2 feature */
478 return;
479
480 if (voice == -1 && seq_mode == SEQ_2 && synth_devs[dev]->alloc_voice)
481 {
482 /* Internal synthesizer (FM, GUS, etc) */
483 voice = alloc_voice(dev, chn, note);
484 }
485 if (voice == -1)
486 voice = chn;
487
488 if (seq_mode == SEQ_2 && (int) dev < num_synths)
489 {
490 /*
491 * The MIDI channel 10 is a percussive channel. Use the note
492 * number to select the proper patch (128 to 255) to play.
493 */
494
495 if (chn == 9)
496 {
497 synth_devs[dev]->set_instr(dev, voice, 128 + note);
498 synth_devs[dev]->chn_info[chn].pgm_num = 128 + note;
499 }
500 synth_devs[dev]->setup_voice(dev, voice, chn);
501 }
502 synth_devs[dev]->start_note(dev, voice, note, parm);
503 break;
504
505 case MIDI_NOTEOFF:
506 if (voice == -1)
507 voice = chn;
508 synth_devs[dev]->kill_note(dev, voice, note, parm);
509 break;
510
511 case MIDI_KEY_PRESSURE:
512 if (voice == -1)
513 voice = chn;
514 synth_devs[dev]->aftertouch(dev, voice, parm);
515 break;
516
517 default:;
518 }
519 #undef dev
520 #undef cmd
521 #undef chn
522 #undef note
523 #undef parm
524 }
525
526
527 static void seq_chn_common_event(unsigned char *event_rec)
528 {
529 unsigned char dev = event_rec[1];
530 unsigned char cmd = event_rec[2];
531 unsigned char chn = event_rec[3];
532 unsigned char p1 = event_rec[4];
533
534 /* unsigned char p2 = event_rec[5]; */
535 unsigned short w14 = *(short *) &event_rec[6];
536
537 if ((int) dev > max_synthdev || synth_devs[dev] == NULL)
538 return;
539 if (!(synth_open_mask & (1 << dev)))
540 return;
541 if (!synth_devs[dev])
542 return;
543
544 switch (cmd)
545 {
546 case MIDI_PGM_CHANGE:
547 if (seq_mode == SEQ_2)
548 {
549 synth_devs[dev]->chn_info[chn].pgm_num = p1;
550 if ((int) dev >= num_synths)
551 synth_devs[dev]->set_instr(dev, chn, p1);
552 }
553 else
554 synth_devs[dev]->set_instr(dev, chn, p1);
555
556 break;
557
558 case MIDI_CTL_CHANGE:
559 if (seq_mode == SEQ_2)
560 {
561 if (chn > 15 || p1 > 127)
562 break;
563
564 synth_devs[dev]->chn_info[chn].controllers[p1] = w14 & 0x7f;
565
566 if (p1 < 32) /* Setting MSB should clear LSB to 0 */
567 synth_devs[dev]->chn_info[chn].controllers[p1 + 32] = 0;
568
569 if ((int) dev < num_synths)
570 {
571 int val = w14 & 0x7f;
572 int i, key;
573
574 if (p1 < 64) /* Combine MSB and LSB */
575 {
576 val = ((synth_devs[dev]->
577 chn_info[chn].controllers[p1 & ~32] & 0x7f) << 7)
578 | (synth_devs[dev]->
579 chn_info[chn].controllers[p1 | 32] & 0x7f);
580 p1 &= ~32;
581 }
582 /* Handle all playing notes on this channel */
583
584 key = ((int) chn << 8);
585
586 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
587 if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
588 synth_devs[dev]->controller(dev, i, p1, val);
589 }
590 else
591 synth_devs[dev]->controller(dev, chn, p1, w14);
592 }
593 else /* Mode 1 */
594 synth_devs[dev]->controller(dev, chn, p1, w14);
595 break;
596
597 case MIDI_PITCH_BEND:
598 if (seq_mode == SEQ_2)
599 {
600 synth_devs[dev]->chn_info[chn].bender_value = w14;
601
602 if ((int) dev < num_synths)
603 {
604 /* Handle all playing notes on this channel */
605 int i, key;
606
607 key = (chn << 8);
608
609 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
610 if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
611 synth_devs[dev]->bender(dev, i, w14);
612 }
613 else
614 synth_devs[dev]->bender(dev, chn, w14);
615 }
616 else /* MODE 1 */
617 synth_devs[dev]->bender(dev, chn, w14);
618 break;
619
620 default:;
621 }
622 }
623
624 static int seq_timing_event(unsigned char *event_rec)
625 {
626 unsigned char cmd = event_rec[1];
627 unsigned int parm = *(int *) &event_rec[4];
628
629 if (seq_mode == SEQ_2)
630 {
631 int ret;
632
633 if ((ret = tmr->event(tmr_no, event_rec)) == TIMER_ARMED)
634 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
635 wake_up(&seq_sleeper);
636 return ret;
637 }
638 switch (cmd)
639 {
640 case TMR_WAIT_REL:
641 parm += prev_event_time;
642
643 /*
644 * NOTE! No break here. Execution of TMR_WAIT_REL continues in the
645 * next case (TMR_WAIT_ABS)
646 */
647
648 case TMR_WAIT_ABS:
649 if (parm > 0)
650 {
651 long time;
652
653 time = parm;
654 prev_event_time = time;
655
656 seq_playing = 1;
657 request_sound_timer(time);
658
659 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
660 wake_up(&seq_sleeper);
661 return TIMER_ARMED;
662 }
663 break;
664
665 case TMR_START:
666 seq_time = jiffies;
667 prev_input_time = 0;
668 prev_event_time = 0;
669 break;
670
671 case TMR_STOP:
672 break;
673
674 case TMR_CONTINUE:
675 break;
676
677 case TMR_TEMPO:
678 break;
679
680 case TMR_ECHO:
681 if (seq_mode == SEQ_2)
682 seq_copy_to_input(event_rec, 8);
683 else
684 {
685 parm = (parm << 8 | SEQ_ECHO);
686 seq_copy_to_input((unsigned char *) &parm, 4);
687 }
688 break;
689
690 default:;
691 }
692
693 return TIMER_NOT_ARMED;
694 }
695
696 static void seq_local_event(unsigned char *event_rec)
697 {
698 unsigned char cmd = event_rec[1];
699 unsigned int parm = *((unsigned int *) &event_rec[4]);
700
701 switch (cmd)
702 {
703 case LOCL_STARTAUDIO:
704 DMAbuf_start_devices(parm);
705 break;
706
707 default:;
708 }
709 }
710
711 static void seq_sysex_message(unsigned char *event_rec)
712 {
713 unsigned int dev = event_rec[1];
714 int i, l = 0;
715 unsigned char *buf = &event_rec[2];
716
717 if (dev > max_synthdev)
718 return;
719 if (!(synth_open_mask & (1 << dev)))
720 return;
721 if (!synth_devs[dev])
722 return;
723
724 l = 0;
725 for (i = 0; i < 6 && buf[i] != 0xff; i++)
726 l = i + 1;
727
728 if (!synth_devs[dev]->send_sysex)
729 return;
730 if (l > 0)
731 synth_devs[dev]->send_sysex(dev, buf, l);
732 }
733
734 static int play_event(unsigned char *q)
735 {
736 /*
737 * NOTE! This routine returns
738 * 0 = normal event played.
739 * 1 = Timer armed. Suspend playback until timer callback.
740 * 2 = MIDI output buffer full. Restore queue and suspend until timer
741 */
742 unsigned int *delay;
743
744 switch (q[0])
745 {
746 case SEQ_NOTEOFF:
747 if (synth_open_mask & (1 << 0))
748 if (synth_devs[0])
749 synth_devs[0]->kill_note(0, q[1], 255, q[3]);
750 break;
751
752 case SEQ_NOTEON:
753 if (q[4] < 128 || q[4] == 255)
754 if (synth_open_mask & (1 << 0))
755 if (synth_devs[0])
756 synth_devs[0]->start_note(0, q[1], q[2], q[3]);
757 break;
758
759 case SEQ_WAIT:
760 delay = (unsigned int *) q; /*
761 * Bytes 1 to 3 are containing the *
762 * delay in 'ticks'
763 */
764 *delay = (*delay >> 8) & 0xffffff;
765
766 if (*delay > 0)
767 {
768 long time;
769
770 seq_playing = 1;
771 time = *delay;
772 prev_event_time = time;
773
774 request_sound_timer(time);
775
776 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
777 wake_up(&seq_sleeper);
778 /*
779 * The timer is now active and will reinvoke this function
780 * after the timer expires. Return to the caller now.
781 */
782 return 1;
783 }
784 break;
785
786 case SEQ_PGMCHANGE:
787 if (synth_open_mask & (1 << 0))
788 if (synth_devs[0])
789 synth_devs[0]->set_instr(0, q[1], q[2]);
790 break;
791
792 case SEQ_SYNCTIMER: /*
793 * Reset timer
794 */
795 seq_time = jiffies;
796 prev_input_time = 0;
797 prev_event_time = 0;
798 break;
799
800 case SEQ_MIDIPUTC: /*
801 * Put a midi character
802 */
803 if (midi_opened[q[2]])
804 {
805 int dev;
806
807 dev = q[2];
808
809 if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
810 break;
811
812 if (!midi_devs[dev]->outputc(dev, q[1]))
813 {
814 /*
815 * Output FIFO is full. Wait one timer cycle and try again.
816 */
817
818 seq_playing = 1;
819 request_sound_timer(-1);
820 return 2;
821 }
822 else
823 midi_written[dev] = 1;
824 }
825 break;
826
827 case SEQ_ECHO:
828 seq_copy_to_input(q, 4); /*
829 * Echo back to the process
830 */
831 break;
832
833 case SEQ_PRIVATE:
834 if ((int) q[1] < max_synthdev)
835 synth_devs[q[1]]->hw_control(q[1], q);
836 break;
837
838 case SEQ_EXTENDED:
839 extended_event(q);
840 break;
841
842 case EV_CHN_VOICE:
843 seq_chn_voice_event(q);
844 break;
845
846 case EV_CHN_COMMON:
847 seq_chn_common_event(q);
848 break;
849
850 case EV_TIMING:
851 if (seq_timing_event(q) == TIMER_ARMED)
852 {
853 return 1;
854 }
855 break;
856
857 case EV_SEQ_LOCAL:
858 seq_local_event(q);
859 break;
860
861 case EV_SYSEX:
862 seq_sysex_message(q);
863 break;
864
865 default:;
866 }
867 return 0;
868 }
869
870 /* called also as timer in irq context */
871 static void seq_startplay(void)
872 {
873 int this_one, action;
874 unsigned long flags;
875
876 while (qlen > 0)
877 {
878
879 spin_lock_irqsave(&lock,flags);
880 qhead = ((this_one = qhead) + 1) % SEQ_MAX_QUEUE;
881 qlen--;
882 spin_unlock_irqrestore(&lock,flags);
883
884 seq_playing = 1;
885
886 if ((action = play_event(&queue[this_one * EV_SZ])))
887 { /* Suspend playback. Next timer routine invokes this routine again */
888 if (action == 2)
889 {
890 qlen++;
891 qhead = this_one;
892 }
893 return;
894 }
895 }
896
897 seq_playing = 0;
898
899 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
900 wake_up(&seq_sleeper);
901 }
902
903 static void reset_controllers(int dev, unsigned char *controller, int update_dev)
904 {
905 int i;
906 for (i = 0; i < 128; i++)
907 controller[i] = ctrl_def_values[i];
908 }
909
910 static void setup_mode2(void)
911 {
912 int dev;
913
914 max_synthdev = num_synths;
915
916 for (dev = 0; dev < num_midis; dev++)
917 {
918 if (midi_devs[dev] && midi_devs[dev]->converter != NULL)
919 {
920 synth_devs[max_synthdev++] = midi_devs[dev]->converter;
921 }
922 }
923
924 for (dev = 0; dev < max_synthdev; dev++)
925 {
926 int chn;
927
928 synth_devs[dev]->sysex_ptr = 0;
929 synth_devs[dev]->emulation = 0;
930
931 for (chn = 0; chn < 16; chn++)
932 {
933 synth_devs[dev]->chn_info[chn].pgm_num = 0;
934 reset_controllers(dev,
935 synth_devs[dev]->chn_info[chn].controllers,0);
936 synth_devs[dev]->chn_info[chn].bender_value = (1 << 7); /* Neutral */
937 synth_devs[dev]->chn_info[chn].bender_range = 200;
938 }
939 }
940 max_mididev = 0;
941 seq_mode = SEQ_2;
942 }
943
944 int sequencer_open(int dev, struct file *file)
945 {
946 int retval, mode, i;
947 int level, tmp;
948
949 if (!sequencer_ok)
950 sequencer_init();
951
952 level = ((dev & 0x0f) == SND_DEV_SEQ2) ? 2 : 1;
953
954 dev = dev >> 4;
955 mode = translate_mode(file);
956
957 DEB(printk("sequencer_open(dev=%d)\n", dev));
958
959 if (!sequencer_ok)
960 {
961 /* printk("Sound card: sequencer not initialized\n");*/
962 return -ENXIO;
963 }
964 if (dev) /* Patch manager device (obsolete) */
965 return -ENXIO;
966
967 if(synth_devs[dev] == NULL)
968 request_module("synth0");
969
970 if (mode == OPEN_READ)
971 {
972 if (!num_midis)
973 {
974 /*printk("Sequencer: No MIDI devices. Input not possible\n");*/
975 sequencer_busy = 0;
976 return -ENXIO;
977 }
978 }
979 if (sequencer_busy)
980 {
981 return -EBUSY;
982 }
983 sequencer_busy = 1;
984 obsolete_api_used = 0;
985
986 max_mididev = num_midis;
987 max_synthdev = num_synths;
988 pre_event_timeout = MAX_SCHEDULE_TIMEOUT;
989 seq_mode = SEQ_1;
990
991 if (pending_timer != -1)
992 {
993 tmr_no = pending_timer;
994 pending_timer = -1;
995 }
996 if (tmr_no == -1) /* Not selected yet */
997 {
998 int i, best;
999
1000 best = -1;
1001 for (i = 0; i < num_sound_timers; i++)
1002 if (sound_timer_devs[i] && sound_timer_devs[i]->priority > best)
1003 {
1004 tmr_no = i;
1005 best = sound_timer_devs[i]->priority;
1006 }
1007 if (tmr_no == -1) /* Should not be */
1008 tmr_no = 0;
1009 }
1010 tmr = sound_timer_devs[tmr_no];
1011
1012 if (level == 2)
1013 {
1014 if (tmr == NULL)
1015 {
1016 /*printk("sequencer: No timer for level 2\n");*/
1017 sequencer_busy = 0;
1018 return -ENXIO;
1019 }
1020 setup_mode2();
1021 }
1022 if (!max_synthdev && !max_mididev)
1023 {
1024 sequencer_busy=0;
1025 return -ENXIO;
1026 }
1027
1028 synth_open_mask = 0;
1029
1030 for (i = 0; i < max_mididev; i++)
1031 {
1032 midi_opened[i] = 0;
1033 midi_written[i] = 0;
1034 }
1035
1036 for (i = 0; i < max_synthdev; i++)
1037 {
1038 if (synth_devs[i]==NULL)
1039 continue;
1040
1041 if (!try_module_get(synth_devs[i]->owner))
1042 continue;
1043
1044 if ((tmp = synth_devs[i]->open(i, mode)) < 0)
1045 {
1046 printk(KERN_WARNING "Sequencer: Warning! Cannot open synth device #%d (%d)\n", i, tmp);
1047 if (synth_devs[i]->midi_dev)
1048 printk(KERN_WARNING "(Maps to MIDI dev #%d)\n", synth_devs[i]->midi_dev);
1049 }
1050 else
1051 {
1052 synth_open_mask |= (1 << i);
1053 if (synth_devs[i]->midi_dev)
1054 midi_opened[synth_devs[i]->midi_dev] = 1;
1055 }
1056 }
1057
1058 seq_time = jiffies;
1059
1060 prev_input_time = 0;
1061 prev_event_time = 0;
1062
1063 if (seq_mode == SEQ_1 && (mode == OPEN_READ || mode == OPEN_READWRITE))
1064 {
1065 /*
1066 * Initialize midi input devices
1067 */
1068
1069 for (i = 0; i < max_mididev; i++)
1070 if (!midi_opened[i] && midi_devs[i])
1071 {
1072 if (!try_module_get(midi_devs[i]->owner))
1073 continue;
1074
1075 if ((retval = midi_devs[i]->open(i, mode,
1076 sequencer_midi_input, sequencer_midi_output)) >= 0)
1077 {
1078 midi_opened[i] = 1;
1079 }
1080 }
1081 }
1082
1083 if (seq_mode == SEQ_2) {
1084 if (try_module_get(tmr->owner))
1085 tmr->open(tmr_no, seq_mode);
1086 }
1087
1088 init_waitqueue_head(&seq_sleeper);
1089 init_waitqueue_head(&midi_sleeper);
1090 output_threshold = SEQ_MAX_QUEUE / 2;
1091
1092 return 0;
1093 }
1094
1095 static void seq_drain_midi_queues(void)
1096 {
1097 int i, n;
1098
1099 /*
1100 * Give the Midi drivers time to drain their output queues
1101 */
1102
1103 n = 1;
1104
1105 while (!signal_pending(current) && n)
1106 {
1107 n = 0;
1108
1109 for (i = 0; i < max_mididev; i++)
1110 if (midi_opened[i] && midi_written[i])
1111 if (midi_devs[i]->buffer_status != NULL)
1112 if (midi_devs[i]->buffer_status(i))
1113 n++;
1114
1115 /*
1116 * Let's have a delay
1117 */
1118
1119 if (n)
1120 interruptible_sleep_on_timeout(&seq_sleeper,
1121 HZ/10);
1122 }
1123 }
1124
1125 void sequencer_release(int dev, struct file *file)
1126 {
1127 int i;
1128 int mode = translate_mode(file);
1129
1130 dev = dev >> 4;
1131
1132 DEB(printk("sequencer_release(dev=%d)\n", dev));
1133
1134 /*
1135 * Wait until the queue is empty (if we don't have nonblock)
1136 */
1137
1138 if (mode != OPEN_READ && !(file->f_flags & O_NONBLOCK))
1139 {
1140 while (!signal_pending(current) && qlen > 0)
1141 {
1142 seq_sync();
1143 interruptible_sleep_on_timeout(&seq_sleeper,
1144 3*HZ);
1145 /* Extra delay */
1146 }
1147 }
1148
1149 if (mode != OPEN_READ)
1150 seq_drain_midi_queues(); /*
1151 * Ensure the output queues are empty
1152 */
1153 seq_reset();
1154 if (mode != OPEN_READ)
1155 seq_drain_midi_queues(); /*
1156 * Flush the all notes off messages
1157 */
1158
1159 for (i = 0; i < max_synthdev; i++)
1160 {
1161 if (synth_open_mask & (1 << i)) /*
1162 * Actually opened
1163 */
1164 if (synth_devs[i])
1165 {
1166 synth_devs[i]->close(i);
1167
1168 module_put(synth_devs[i]->owner);
1169
1170 if (synth_devs[i]->midi_dev)
1171 midi_opened[synth_devs[i]->midi_dev] = 0;
1172 }
1173 }
1174
1175 for (i = 0; i < max_mididev; i++)
1176 {
1177 if (midi_opened[i]) {
1178 midi_devs[i]->close(i);
1179 module_put(midi_devs[i]->owner);
1180 }
1181 }
1182
1183 if (seq_mode == SEQ_2) {
1184 tmr->close(tmr_no);
1185 module_put(tmr->owner);
1186 }
1187
1188 if (obsolete_api_used)
1189 printk(KERN_WARNING "/dev/music: Obsolete (4 byte) API was used by %s\n", current->comm);
1190 sequencer_busy = 0;
1191 }
1192
1193 static int seq_sync(void)
1194 {
1195 if (qlen && !seq_playing && !signal_pending(current))
1196 seq_startplay();
1197
1198 if (qlen > 0)
1199 interruptible_sleep_on_timeout(&seq_sleeper, HZ);
1200 return qlen;
1201 }
1202
1203 static void midi_outc(int dev, unsigned char data)
1204 {
1205 /*
1206 * NOTE! Calls sleep(). Don't call this from interrupt.
1207 */
1208
1209 int n;
1210 unsigned long flags;
1211
1212 /*
1213 * This routine sends one byte to the Midi channel.
1214 * If the output FIFO is full, it waits until there
1215 * is space in the queue
1216 */
1217
1218 n = 3 * HZ; /* Timeout */
1219
1220 spin_lock_irqsave(&lock,flags);
1221 while (n && !midi_devs[dev]->outputc(dev, data)) {
1222 interruptible_sleep_on_timeout(&seq_sleeper, HZ/25);
1223 n--;
1224 }
1225 spin_unlock_irqrestore(&lock,flags);
1226 }
1227
1228 static void seq_reset(void)
1229 {
1230 /*
1231 * NOTE! Calls sleep(). Don't call this from interrupt.
1232 */
1233
1234 int i;
1235 int chn;
1236 unsigned long flags;
1237
1238 sound_stop_timer();
1239
1240 seq_time = jiffies;
1241 prev_input_time = 0;
1242 prev_event_time = 0;
1243
1244 qlen = qhead = qtail = 0;
1245 iqlen = iqhead = iqtail = 0;
1246
1247 for (i = 0; i < max_synthdev; i++)
1248 if (synth_open_mask & (1 << i))
1249 if (synth_devs[i])
1250 synth_devs[i]->reset(i);
1251
1252 if (seq_mode == SEQ_2)
1253 {
1254 for (chn = 0; chn < 16; chn++)
1255 for (i = 0; i < max_synthdev; i++)
1256 if (synth_open_mask & (1 << i))
1257 if (synth_devs[i])
1258 {
1259 synth_devs[i]->controller(i, chn, 123, 0); /* All notes off */
1260 synth_devs[i]->controller(i, chn, 121, 0); /* Reset all ctl */
1261 synth_devs[i]->bender(i, chn, 1 << 13); /* Bender off */
1262 }
1263 }
1264 else /* seq_mode == SEQ_1 */
1265 {
1266 for (i = 0; i < max_mididev; i++)
1267 if (midi_written[i]) /*
1268 * Midi used. Some notes may still be playing
1269 */
1270 {
1271 /*
1272 * Sending just a ACTIVE SENSING message should be enough to stop all
1273 * playing notes. Since there are devices not recognizing the
1274 * active sensing, we have to send some all notes off messages also.
1275 */
1276 midi_outc(i, 0xfe);
1277
1278 for (chn = 0; chn < 16; chn++)
1279 {
1280 midi_outc(i, (unsigned char) (0xb0 + (chn & 0x0f))); /* control change */
1281 midi_outc(i, 0x7b); /* All notes off */
1282 midi_outc(i, 0); /* Dummy parameter */
1283 }
1284
1285 midi_devs[i]->close(i);
1286
1287 midi_written[i] = 0;
1288 midi_opened[i] = 0;
1289 }
1290 }
1291
1292 seq_playing = 0;
1293
1294 spin_lock_irqsave(&lock,flags);
1295
1296 if (waitqueue_active(&seq_sleeper)) {
1297 /* printk( "Sequencer Warning: Unexpected sleeping process - Waking up\n"); */
1298 wake_up(&seq_sleeper);
1299 }
1300 spin_unlock_irqrestore(&lock,flags);
1301 }
1302
1303 static void seq_panic(void)
1304 {
1305 /*
1306 * This routine is called by the application in case the user
1307 * wants to reset the system to the default state.
1308 */
1309
1310 seq_reset();
1311
1312 /*
1313 * Since some of the devices don't recognize the active sensing and
1314 * all notes off messages, we have to shut all notes manually.
1315 *
1316 * TO BE IMPLEMENTED LATER
1317 */
1318
1319 /*
1320 * Also return the controllers to their default states
1321 */
1322 }
1323
1324 int sequencer_ioctl(int dev, struct file *file, unsigned int cmd, void __user *arg)
1325 {
1326 int midi_dev, orig_dev, val, err;
1327 int mode = translate_mode(file);
1328 struct synth_info inf;
1329 struct seq_event_rec event_rec;
1330 unsigned long flags;
1331 int __user *p = arg;
1332
1333 orig_dev = dev = dev >> 4;
1334
1335 switch (cmd)
1336 {
1337 case SNDCTL_TMR_TIMEBASE:
1338 case SNDCTL_TMR_TEMPO:
1339 case SNDCTL_TMR_START:
1340 case SNDCTL_TMR_STOP:
1341 case SNDCTL_TMR_CONTINUE:
1342 case SNDCTL_TMR_METRONOME:
1343 case SNDCTL_TMR_SOURCE:
1344 if (seq_mode != SEQ_2)
1345 return -EINVAL;
1346 return tmr->ioctl(tmr_no, cmd, arg);
1347
1348 case SNDCTL_TMR_SELECT:
1349 if (seq_mode != SEQ_2)
1350 return -EINVAL;
1351 if (get_user(pending_timer, p))
1352 return -EFAULT;
1353 if (pending_timer < 0 || pending_timer >= num_sound_timers || sound_timer_devs[pending_timer] == NULL)
1354 {
1355 pending_timer = -1;
1356 return -EINVAL;
1357 }
1358 val = pending_timer;
1359 break;
1360
1361 case SNDCTL_SEQ_PANIC:
1362 seq_panic();
1363 return -EINVAL;
1364
1365 case SNDCTL_SEQ_SYNC:
1366 if (mode == OPEN_READ)
1367 return 0;
1368 while (qlen > 0 && !signal_pending(current))
1369 seq_sync();
1370 return qlen ? -EINTR : 0;
1371
1372 case SNDCTL_SEQ_RESET:
1373 seq_reset();
1374 return 0;
1375
1376 case SNDCTL_SEQ_TESTMIDI:
1377 if (__get_user(midi_dev, p))
1378 return -EFAULT;
1379 if (midi_dev < 0 || midi_dev >= max_mididev || !midi_devs[midi_dev])
1380 return -ENXIO;
1381
1382 if (!midi_opened[midi_dev] &&
1383 (err = midi_devs[midi_dev]->open(midi_dev, mode, sequencer_midi_input,
1384 sequencer_midi_output)) < 0)
1385 return err;
1386 midi_opened[midi_dev] = 1;
1387 return 0;
1388
1389 case SNDCTL_SEQ_GETINCOUNT:
1390 if (mode == OPEN_WRITE)
1391 return 0;
1392 val = iqlen;
1393 break;
1394
1395 case SNDCTL_SEQ_GETOUTCOUNT:
1396 if (mode == OPEN_READ)
1397 return 0;
1398 val = SEQ_MAX_QUEUE - qlen;
1399 break;
1400
1401 case SNDCTL_SEQ_GETTIME:
1402 if (seq_mode == SEQ_2)
1403 return tmr->ioctl(tmr_no, cmd, arg);
1404 val = jiffies - seq_time;
1405 break;
1406
1407 case SNDCTL_SEQ_CTRLRATE:
1408 /*
1409 * If *arg == 0, just return the current rate
1410 */
1411 if (seq_mode == SEQ_2)
1412 return tmr->ioctl(tmr_no, cmd, arg);
1413
1414 if (get_user(val, p))
1415 return -EFAULT;
1416 if (val != 0)
1417 return -EINVAL;
1418 val = HZ;
1419 break;
1420
1421 case SNDCTL_SEQ_RESETSAMPLES:
1422 case SNDCTL_SYNTH_REMOVESAMPLE:
1423 case SNDCTL_SYNTH_CONTROL:
1424 if (get_user(dev, p))
1425 return -EFAULT;
1426 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1427 return -ENXIO;
1428 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1429 return -EBUSY;
1430 return synth_devs[dev]->ioctl(dev, cmd, arg);
1431
1432 case SNDCTL_SEQ_NRSYNTHS:
1433 val = max_synthdev;
1434 break;
1435
1436 case SNDCTL_SEQ_NRMIDIS:
1437 val = max_mididev;
1438 break;
1439
1440 case SNDCTL_SYNTH_MEMAVL:
1441 if (get_user(dev, p))
1442 return -EFAULT;
1443 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1444 return -ENXIO;
1445 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1446 return -EBUSY;
1447 val = synth_devs[dev]->ioctl(dev, cmd, arg);
1448 break;
1449
1450 case SNDCTL_FM_4OP_ENABLE:
1451 if (get_user(dev, p))
1452 return -EFAULT;
1453 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1454 return -ENXIO;
1455 if (!(synth_open_mask & (1 << dev)))
1456 return -ENXIO;
1457 synth_devs[dev]->ioctl(dev, cmd, arg);
1458 return 0;
1459
1460 case SNDCTL_SYNTH_INFO:
1461 if (get_user(dev, &((struct synth_info __user *)arg)->device))
1462 return -EFAULT;
1463 if (dev < 0 || dev >= max_synthdev)
1464 return -ENXIO;
1465 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1466 return -EBUSY;
1467 return synth_devs[dev]->ioctl(dev, cmd, arg);
1468
1469 /* Like SYNTH_INFO but returns ID in the name field */
1470 case SNDCTL_SYNTH_ID:
1471 if (get_user(dev, &((struct synth_info __user *)arg)->device))
1472 return -EFAULT;
1473 if (dev < 0 || dev >= max_synthdev)
1474 return -ENXIO;
1475 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1476 return -EBUSY;
1477 memcpy(&inf, synth_devs[dev]->info, sizeof(inf));
1478 strlcpy(inf.name, synth_devs[dev]->id, sizeof(inf.name));
1479 inf.device = dev;
1480 return copy_to_user(arg, &inf, sizeof(inf))?-EFAULT:0;
1481
1482 case SNDCTL_SEQ_OUTOFBAND:
1483 if (copy_from_user(&event_rec, arg, sizeof(event_rec)))
1484 return -EFAULT;
1485 spin_lock_irqsave(&lock,flags);
1486 play_event(event_rec.arr);
1487 spin_unlock_irqrestore(&lock,flags);
1488 return 0;
1489
1490 case SNDCTL_MIDI_INFO:
1491 if (get_user(dev, &((struct midi_info __user *)arg)->device))
1492 return -EFAULT;
1493 if (dev < 0 || dev >= max_mididev || !midi_devs[dev])
1494 return -ENXIO;
1495 midi_devs[dev]->info.device = dev;
1496 return copy_to_user(arg, &midi_devs[dev]->info, sizeof(struct midi_info))?-EFAULT:0;
1497
1498 case SNDCTL_SEQ_THRESHOLD:
1499 if (get_user(val, p))
1500 return -EFAULT;
1501 if (val < 1)
1502 val = 1;
1503 if (val >= SEQ_MAX_QUEUE)
1504 val = SEQ_MAX_QUEUE - 1;
1505 output_threshold = val;
1506 return 0;
1507
1508 case SNDCTL_MIDI_PRETIME:
1509 if (get_user(val, p))
1510 return -EFAULT;
1511 if (val < 0)
1512 val = 0;
1513 val = (HZ * val) / 10;
1514 pre_event_timeout = val;
1515 break;
1516
1517 default:
1518 if (mode == OPEN_READ)
1519 return -EIO;
1520 if (!synth_devs[0])
1521 return -ENXIO;
1522 if (!(synth_open_mask & (1 << 0)))
1523 return -ENXIO;
1524 if (!synth_devs[0]->ioctl)
1525 return -EINVAL;
1526 return synth_devs[0]->ioctl(0, cmd, arg);
1527 }
1528 return put_user(val, p);
1529 }
1530
1531 /* No kernel lock - we're using the global irq lock here */
1532 unsigned int sequencer_poll(int dev, struct file *file, poll_table * wait)
1533 {
1534 unsigned long flags;
1535 unsigned int mask = 0;
1536
1537 dev = dev >> 4;
1538
1539 spin_lock_irqsave(&lock,flags);
1540 /* input */
1541 poll_wait(file, &midi_sleeper, wait);
1542 if (iqlen)
1543 mask |= POLLIN | POLLRDNORM;
1544
1545 /* output */
1546 poll_wait(file, &seq_sleeper, wait);
1547 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
1548 mask |= POLLOUT | POLLWRNORM;
1549 spin_unlock_irqrestore(&lock,flags);
1550 return mask;
1551 }
1552
1553
1554 void sequencer_timer(unsigned long dummy)
1555 {
1556 seq_startplay();
1557 }
1558 EXPORT_SYMBOL(sequencer_timer);
1559
1560 int note_to_freq(int note_num)
1561 {
1562
1563 /*
1564 * This routine converts a midi note to a frequency (multiplied by 1000)
1565 */
1566
1567 int note, octave, note_freq;
1568 static int notes[] =
1569 {
1570 261632, 277189, 293671, 311132, 329632, 349232,
1571 369998, 391998, 415306, 440000, 466162, 493880
1572 };
1573
1574 #define BASE_OCTAVE 5
1575
1576 octave = note_num / 12;
1577 note = note_num % 12;
1578
1579 note_freq = notes[note];
1580
1581 if (octave < BASE_OCTAVE)
1582 note_freq >>= (BASE_OCTAVE - octave);
1583 else if (octave > BASE_OCTAVE)
1584 note_freq <<= (octave - BASE_OCTAVE);
1585
1586 /*
1587 * note_freq >>= 1;
1588 */
1589
1590 return note_freq;
1591 }
1592 EXPORT_SYMBOL(note_to_freq);
1593
1594 unsigned long compute_finetune(unsigned long base_freq, int bend, int range,
1595 int vibrato_cents)
1596 {
1597 unsigned long amount;
1598 int negative, semitones, cents, multiplier = 1;
1599
1600 if (!bend)
1601 return base_freq;
1602 if (!range)
1603 return base_freq;
1604
1605 if (!base_freq)
1606 return base_freq;
1607
1608 if (range >= 8192)
1609 range = 8192;
1610
1611 bend = bend * range / 8192; /* Convert to cents */
1612 bend += vibrato_cents;
1613
1614 if (!bend)
1615 return base_freq;
1616
1617 negative = bend < 0 ? 1 : 0;
1618
1619 if (bend < 0)
1620 bend *= -1;
1621 if (bend > range)
1622 bend = range;
1623
1624 /*
1625 if (bend > 2399)
1626 bend = 2399;
1627 */
1628 while (bend > 2399)
1629 {
1630 multiplier *= 4;
1631 bend -= 2400;
1632 }
1633
1634 semitones = bend / 100;
1635 if (semitones > 99)
1636 semitones = 99;
1637 cents = bend % 100;
1638
1639 amount = (int) (semitone_tuning[semitones] * multiplier * cent_tuning[cents]) / 10000;
1640
1641 if (negative)
1642 return (base_freq * 10000) / amount; /* Bend down */
1643 else
1644 return (base_freq * amount) / 10000; /* Bend up */
1645 }
1646 EXPORT_SYMBOL(compute_finetune);
1647
1648 void sequencer_init(void)
1649 {
1650 if (sequencer_ok)
1651 return;
1652 queue = (unsigned char *)vmalloc(SEQ_MAX_QUEUE * EV_SZ);
1653 if (queue == NULL)
1654 {
1655 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer output queue\n");
1656 return;
1657 }
1658 iqueue = (unsigned char *)vmalloc(SEQ_MAX_QUEUE * IEV_SZ);
1659 if (iqueue == NULL)
1660 {
1661 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer input queue\n");
1662 vfree(queue);
1663 return;
1664 }
1665 sequencer_ok = 1;
1666 }
1667 EXPORT_SYMBOL(sequencer_init);
1668
1669 void sequencer_unload(void)
1670 {
1671 vfree(queue);
1672 vfree(iqueue);
1673 queue = iqueue = NULL;
1674 }
mah project overlay