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regulator, mc13xxx: Remove pointless test for unsigned less than zero
[zen-stable.git] / sound / oss / sequencer.c
blob5ea1098ac427a5546bdf9f211587bbe8030d1821
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 mode = translate_mode(file);
216
217 dev = dev >> 4;
218
219 DEB(printk("sequencer_write(dev=%d, count=%d)\n", dev, count));
220
221 if (mode == OPEN_READ)
222 return -EIO;
223
224 c = count;
225
226 while (c >= 4)
227 {
228 if (copy_from_user((char *) event_rec, &(buf)[p], 4))
229 goto out;
230 ev_code = event_rec[0];
231
232 if (ev_code == SEQ_FULLSIZE)
233 {
234 int err, fmt;
235
236 dev = *(unsigned short *) &event_rec[2];
237 if (dev < 0 || dev >= max_synthdev || synth_devs[dev] == NULL)
238 return -ENXIO;
239
240 if (!(synth_open_mask & (1 << dev)))
241 return -ENXIO;
242
243 fmt = (*(short *) &event_rec[0]) & 0xffff;
244 err = synth_devs[dev]->load_patch(dev, fmt, buf, p + 4, c, 0);
245 if (err < 0)
246 return err;
247
248 return err;
249 }
250 if (ev_code >= 128)
251 {
252 if (seq_mode == SEQ_2 && ev_code == SEQ_EXTENDED)
253 {
254 printk(KERN_WARNING "Sequencer: Invalid level 2 event %x\n", ev_code);
255 return -EINVAL;
256 }
257 ev_size = 8;
258
259 if (c < ev_size)
260 {
261 if (!seq_playing)
262 seq_startplay();
263 return count - c;
264 }
265 if (copy_from_user((char *)&event_rec[4],
266 &(buf)[p + 4], 4))
267 goto out;
268
269 }
270 else
271 {
272 if (seq_mode == SEQ_2)
273 {
274 printk(KERN_WARNING "Sequencer: 4 byte event in level 2 mode\n");
275 return -EINVAL;
276 }
277 ev_size = 4;
278
279 if (event_rec[0] != SEQ_MIDIPUTC)
280 obsolete_api_used = 1;
281 }
282
283 if (event_rec[0] == SEQ_MIDIPUTC)
284 {
285 if (!midi_opened[event_rec[2]])
286 {
287 int err, mode;
288 int dev = event_rec[2];
289
290 if (dev >= max_mididev || midi_devs[dev]==NULL)
291 {
292 /*printk("Sequencer Error: Nonexistent MIDI device %d\n", dev);*/
293 return -ENXIO;
294 }
295 mode = translate_mode(file);
296
297 if ((err = midi_devs[dev]->open(dev, mode,
298 sequencer_midi_input, sequencer_midi_output)) < 0)
299 {
300 seq_reset();
301 printk(KERN_WARNING "Sequencer Error: Unable to open Midi #%d\n", dev);
302 return err;
303 }
304 midi_opened[dev] = 1;
305 }
306 }
307 if (!seq_queue(event_rec, (file->f_flags & (O_NONBLOCK) ? 1 : 0)))
308 {
309 int processed = count - c;
310
311 if (!seq_playing)
312 seq_startplay();
313
314 if (!processed && (file->f_flags & O_NONBLOCK))
315 return -EAGAIN;
316 else
317 return processed;
318 }
319 p += ev_size;
320 c -= ev_size;
321 }
322
323 if (!seq_playing)
324 seq_startplay();
325 out:
326 return count;
327 }
328
329 static int seq_queue(unsigned char *note, char nonblock)
330 {
331
332 /*
333 * Test if there is space in the queue
334 */
335
336 if (qlen >= SEQ_MAX_QUEUE)
337 if (!seq_playing)
338 seq_startplay(); /*
339 * Give chance to drain the queue
340 */
341
342 if (!nonblock && qlen >= SEQ_MAX_QUEUE && !waitqueue_active(&seq_sleeper)) {
343 /*
344 * Sleep until there is enough space on the queue
345 */
346 interruptible_sleep_on(&seq_sleeper);
347 }
348 if (qlen >= SEQ_MAX_QUEUE)
349 {
350 return 0; /*
351 * To be sure
352 */
353 }
354 memcpy(&queue[qtail * EV_SZ], note, EV_SZ);
355
356 qtail = (qtail + 1) % SEQ_MAX_QUEUE;
357 qlen++;
358
359 return 1;
360 }
361
362 static int extended_event(unsigned char *q)
363 {
364 int dev = q[2];
365
366 if (dev < 0 || dev >= max_synthdev)
367 return -ENXIO;
368
369 if (!(synth_open_mask & (1 << dev)))
370 return -ENXIO;
371
372 switch (q[1])
373 {
374 case SEQ_NOTEOFF:
375 synth_devs[dev]->kill_note(dev, q[3], q[4], q[5]);
376 break;
377
378 case SEQ_NOTEON:
379 if (q[4] > 127 && q[4] != 255)
380 return 0;
381
382 if (q[5] == 0)
383 {
384 synth_devs[dev]->kill_note(dev, q[3], q[4], q[5]);
385 break;
386 }
387 synth_devs[dev]->start_note(dev, q[3], q[4], q[5]);
388 break;
389
390 case SEQ_PGMCHANGE:
391 synth_devs[dev]->set_instr(dev, q[3], q[4]);
392 break;
393
394 case SEQ_AFTERTOUCH:
395 synth_devs[dev]->aftertouch(dev, q[3], q[4]);
396 break;
397
398 case SEQ_BALANCE:
399 synth_devs[dev]->panning(dev, q[3], (char) q[4]);
400 break;
401
402 case SEQ_CONTROLLER:
403 synth_devs[dev]->controller(dev, q[3], q[4], (short) (q[5] | (q[6] << 8)));
404 break;
405
406 case SEQ_VOLMODE:
407 if (synth_devs[dev]->volume_method != NULL)
408 synth_devs[dev]->volume_method(dev, q[3]);
409 break;
410
411 default:
412 return -EINVAL;
413 }
414 return 0;
415 }
416
417 static int find_voice(int dev, int chn, int note)
418 {
419 unsigned short key;
420 int i;
421
422 key = (chn << 8) | (note + 1);
423 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
424 if (synth_devs[dev]->alloc.map[i] == key)
425 return i;
426 return -1;
427 }
428
429 static int alloc_voice(int dev, int chn, int note)
430 {
431 unsigned short key;
432 int voice;
433
434 key = (chn << 8) | (note + 1);
435
436 voice = synth_devs[dev]->alloc_voice(dev, chn, note,
437 &synth_devs[dev]->alloc);
438 synth_devs[dev]->alloc.map[voice] = key;
439 synth_devs[dev]->alloc.alloc_times[voice] =
440 synth_devs[dev]->alloc.timestamp++;
441 return voice;
442 }
443
444 static void seq_chn_voice_event(unsigned char *event_rec)
445 {
446 #define dev event_rec[1]
447 #define cmd event_rec[2]
448 #define chn event_rec[3]
449 #define note event_rec[4]
450 #define parm event_rec[5]
451
452 int voice = -1;
453
454 if ((int) dev > max_synthdev || synth_devs[dev] == NULL)
455 return;
456 if (!(synth_open_mask & (1 << dev)))
457 return;
458 if (!synth_devs[dev])
459 return;
460
461 if (seq_mode == SEQ_2)
462 {
463 if (synth_devs[dev]->alloc_voice)
464 voice = find_voice(dev, chn, note);
465
466 if (cmd == MIDI_NOTEON && parm == 0)
467 {
468 cmd = MIDI_NOTEOFF;
469 parm = 64;
470 }
471 }
472
473 switch (cmd)
474 {
475 case MIDI_NOTEON:
476 if (note > 127 && note != 255) /* Not a seq2 feature */
477 return;
478
479 if (voice == -1 && seq_mode == SEQ_2 && synth_devs[dev]->alloc_voice)
480 {
481 /* Internal synthesizer (FM, GUS, etc) */
482 voice = alloc_voice(dev, chn, note);
483 }
484 if (voice == -1)
485 voice = chn;
486
487 if (seq_mode == SEQ_2 && (int) dev < num_synths)
488 {
489 /*
490 * The MIDI channel 10 is a percussive channel. Use the note
491 * number to select the proper patch (128 to 255) to play.
492 */
493
494 if (chn == 9)
495 {
496 synth_devs[dev]->set_instr(dev, voice, 128 + note);
497 synth_devs[dev]->chn_info[chn].pgm_num = 128 + note;
498 }
499 synth_devs[dev]->setup_voice(dev, voice, chn);
500 }
501 synth_devs[dev]->start_note(dev, voice, note, parm);
502 break;
503
504 case MIDI_NOTEOFF:
505 if (voice == -1)
506 voice = chn;
507 synth_devs[dev]->kill_note(dev, voice, note, parm);
508 break;
509
510 case MIDI_KEY_PRESSURE:
511 if (voice == -1)
512 voice = chn;
513 synth_devs[dev]->aftertouch(dev, voice, parm);
514 break;
515
516 default:;
517 }
518 #undef dev
519 #undef cmd
520 #undef chn
521 #undef note
522 #undef parm
523 }
524
525
526 static void seq_chn_common_event(unsigned char *event_rec)
527 {
528 unsigned char dev = event_rec[1];
529 unsigned char cmd = event_rec[2];
530 unsigned char chn = event_rec[3];
531 unsigned char p1 = event_rec[4];
532
533 /* unsigned char p2 = event_rec[5]; */
534 unsigned short w14 = *(short *) &event_rec[6];
535
536 if ((int) dev > max_synthdev || synth_devs[dev] == NULL)
537 return;
538 if (!(synth_open_mask & (1 << dev)))
539 return;
540 if (!synth_devs[dev])
541 return;
542
543 switch (cmd)
544 {
545 case MIDI_PGM_CHANGE:
546 if (seq_mode == SEQ_2)
547 {
548 synth_devs[dev]->chn_info[chn].pgm_num = p1;
549 if ((int) dev >= num_synths)
550 synth_devs[dev]->set_instr(dev, chn, p1);
551 }
552 else
553 synth_devs[dev]->set_instr(dev, chn, p1);
554
555 break;
556
557 case MIDI_CTL_CHANGE:
558 if (seq_mode == SEQ_2)
559 {
560 if (chn > 15 || p1 > 127)
561 break;
562
563 synth_devs[dev]->chn_info[chn].controllers[p1] = w14 & 0x7f;
564
565 if (p1 < 32) /* Setting MSB should clear LSB to 0 */
566 synth_devs[dev]->chn_info[chn].controllers[p1 + 32] = 0;
567
568 if ((int) dev < num_synths)
569 {
570 int val = w14 & 0x7f;
571 int i, key;
572
573 if (p1 < 64) /* Combine MSB and LSB */
574 {
575 val = ((synth_devs[dev]->
576 chn_info[chn].controllers[p1 & ~32] & 0x7f) << 7)
577 | (synth_devs[dev]->
578 chn_info[chn].controllers[p1 | 32] & 0x7f);
579 p1 &= ~32;
580 }
581 /* Handle all playing notes on this channel */
582
583 key = ((int) chn << 8);
584
585 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
586 if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
587 synth_devs[dev]->controller(dev, i, p1, val);
588 }
589 else
590 synth_devs[dev]->controller(dev, chn, p1, w14);
591 }
592 else /* Mode 1 */
593 synth_devs[dev]->controller(dev, chn, p1, w14);
594 break;
595
596 case MIDI_PITCH_BEND:
597 if (seq_mode == SEQ_2)
598 {
599 synth_devs[dev]->chn_info[chn].bender_value = w14;
600
601 if ((int) dev < num_synths)
602 {
603 /* Handle all playing notes on this channel */
604 int i, key;
605
606 key = (chn << 8);
607
608 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
609 if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
610 synth_devs[dev]->bender(dev, i, w14);
611 }
612 else
613 synth_devs[dev]->bender(dev, chn, w14);
614 }
615 else /* MODE 1 */
616 synth_devs[dev]->bender(dev, chn, w14);
617 break;
618
619 default:;
620 }
621 }
622
623 static int seq_timing_event(unsigned char *event_rec)
624 {
625 unsigned char cmd = event_rec[1];
626 unsigned int parm = *(int *) &event_rec[4];
627
628 if (seq_mode == SEQ_2)
629 {
630 int ret;
631
632 if ((ret = tmr->event(tmr_no, event_rec)) == TIMER_ARMED)
633 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
634 wake_up(&seq_sleeper);
635 return ret;
636 }
637 switch (cmd)
638 {
639 case TMR_WAIT_REL:
640 parm += prev_event_time;
641
642 /*
643 * NOTE! No break here. Execution of TMR_WAIT_REL continues in the
644 * next case (TMR_WAIT_ABS)
645 */
646
647 case TMR_WAIT_ABS:
648 if (parm > 0)
649 {
650 long time;
651
652 time = parm;
653 prev_event_time = time;
654
655 seq_playing = 1;
656 request_sound_timer(time);
657
658 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
659 wake_up(&seq_sleeper);
660 return TIMER_ARMED;
661 }
662 break;
663
664 case TMR_START:
665 seq_time = jiffies;
666 prev_input_time = 0;
667 prev_event_time = 0;
668 break;
669
670 case TMR_STOP:
671 break;
672
673 case TMR_CONTINUE:
674 break;
675
676 case TMR_TEMPO:
677 break;
678
679 case TMR_ECHO:
680 if (seq_mode == SEQ_2)
681 seq_copy_to_input(event_rec, 8);
682 else
683 {
684 parm = (parm << 8 | SEQ_ECHO);
685 seq_copy_to_input((unsigned char *) &parm, 4);
686 }
687 break;
688
689 default:;
690 }
691
692 return TIMER_NOT_ARMED;
693 }
694
695 static void seq_local_event(unsigned char *event_rec)
696 {
697 unsigned char cmd = event_rec[1];
698 unsigned int parm = *((unsigned int *) &event_rec[4]);
699
700 switch (cmd)
701 {
702 case LOCL_STARTAUDIO:
703 DMAbuf_start_devices(parm);
704 break;
705
706 default:;
707 }
708 }
709
710 static void seq_sysex_message(unsigned char *event_rec)
711 {
712 unsigned int dev = event_rec[1];
713 int i, l = 0;
714 unsigned char *buf = &event_rec[2];
715
716 if (dev > max_synthdev)
717 return;
718 if (!(synth_open_mask & (1 << dev)))
719 return;
720 if (!synth_devs[dev])
721 return;
722
723 l = 0;
724 for (i = 0; i < 6 && buf[i] != 0xff; i++)
725 l = i + 1;
726
727 if (!synth_devs[dev]->send_sysex)
728 return;
729 if (l > 0)
730 synth_devs[dev]->send_sysex(dev, buf, l);
731 }
732
733 static int play_event(unsigned char *q)
734 {
735 /*
736 * NOTE! This routine returns
737 * 0 = normal event played.
738 * 1 = Timer armed. Suspend playback until timer callback.
739 * 2 = MIDI output buffer full. Restore queue and suspend until timer
740 */
741 unsigned int *delay;
742
743 switch (q[0])
744 {
745 case SEQ_NOTEOFF:
746 if (synth_open_mask & (1 << 0))
747 if (synth_devs[0])
748 synth_devs[0]->kill_note(0, q[1], 255, q[3]);
749 break;
750
751 case SEQ_NOTEON:
752 if (q[4] < 128 || q[4] == 255)
753 if (synth_open_mask & (1 << 0))
754 if (synth_devs[0])
755 synth_devs[0]->start_note(0, q[1], q[2], q[3]);
756 break;
757
758 case SEQ_WAIT:
759 delay = (unsigned int *) q; /*
760 * Bytes 1 to 3 are containing the *
761 * delay in 'ticks'
762 */
763 *delay = (*delay >> 8) & 0xffffff;
764
765 if (*delay > 0)
766 {
767 long time;
768
769 seq_playing = 1;
770 time = *delay;
771 prev_event_time = time;
772
773 request_sound_timer(time);
774
775 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
776 wake_up(&seq_sleeper);
777 /*
778 * The timer is now active and will reinvoke this function
779 * after the timer expires. Return to the caller now.
780 */
781 return 1;
782 }
783 break;
784
785 case SEQ_PGMCHANGE:
786 if (synth_open_mask & (1 << 0))
787 if (synth_devs[0])
788 synth_devs[0]->set_instr(0, q[1], q[2]);
789 break;
790
791 case SEQ_SYNCTIMER: /*
792 * Reset timer
793 */
794 seq_time = jiffies;
795 prev_input_time = 0;
796 prev_event_time = 0;
797 break;
798
799 case SEQ_MIDIPUTC: /*
800 * Put a midi character
801 */
802 if (midi_opened[q[2]])
803 {
804 int dev;
805
806 dev = q[2];
807
808 if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
809 break;
810
811 if (!midi_devs[dev]->outputc(dev, q[1]))
812 {
813 /*
814 * Output FIFO is full. Wait one timer cycle and try again.
815 */
816
817 seq_playing = 1;
818 request_sound_timer(-1);
819 return 2;
820 }
821 else
822 midi_written[dev] = 1;
823 }
824 break;
825
826 case SEQ_ECHO:
827 seq_copy_to_input(q, 4); /*
828 * Echo back to the process
829 */
830 break;
831
832 case SEQ_PRIVATE:
833 if ((int) q[1] < max_synthdev)
834 synth_devs[q[1]]->hw_control(q[1], q);
835 break;
836
837 case SEQ_EXTENDED:
838 extended_event(q);
839 break;
840
841 case EV_CHN_VOICE:
842 seq_chn_voice_event(q);
843 break;
844
845 case EV_CHN_COMMON:
846 seq_chn_common_event(q);
847 break;
848
849 case EV_TIMING:
850 if (seq_timing_event(q) == TIMER_ARMED)
851 {
852 return 1;
853 }
854 break;
855
856 case EV_SEQ_LOCAL:
857 seq_local_event(q);
858 break;
859
860 case EV_SYSEX:
861 seq_sysex_message(q);
862 break;
863
864 default:;
865 }
866 return 0;
867 }
868
869 /* called also as timer in irq context */
870 static void seq_startplay(void)
871 {
872 int this_one, action;
873 unsigned long flags;
874
875 while (qlen > 0)
876 {
877
878 spin_lock_irqsave(&lock,flags);
879 qhead = ((this_one = qhead) + 1) % SEQ_MAX_QUEUE;
880 qlen--;
881 spin_unlock_irqrestore(&lock,flags);
882
883 seq_playing = 1;
884
885 if ((action = play_event(&queue[this_one * EV_SZ])))
886 { /* Suspend playback. Next timer routine invokes this routine again */
887 if (action == 2)
888 {
889 qlen++;
890 qhead = this_one;
891 }
892 return;
893 }
894 }
895
896 seq_playing = 0;
897
898 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
899 wake_up(&seq_sleeper);
900 }
901
902 static void reset_controllers(int dev, unsigned char *controller, int update_dev)
903 {
904 int i;
905 for (i = 0; i < 128; i++)
906 controller[i] = ctrl_def_values[i];
907 }
908
909 static void setup_mode2(void)
910 {
911 int dev;
912
913 max_synthdev = num_synths;
914
915 for (dev = 0; dev < num_midis; dev++)
916 {
917 if (midi_devs[dev] && midi_devs[dev]->converter != NULL)
918 {
919 synth_devs[max_synthdev++] = midi_devs[dev]->converter;
920 }
921 }
922
923 for (dev = 0; dev < max_synthdev; dev++)
924 {
925 int chn;
926
927 synth_devs[dev]->sysex_ptr = 0;
928 synth_devs[dev]->emulation = 0;
929
930 for (chn = 0; chn < 16; chn++)
931 {
932 synth_devs[dev]->chn_info[chn].pgm_num = 0;
933 reset_controllers(dev,
934 synth_devs[dev]->chn_info[chn].controllers,0);
935 synth_devs[dev]->chn_info[chn].bender_value = (1 << 7); /* Neutral */
936 synth_devs[dev]->chn_info[chn].bender_range = 200;
937 }
938 }
939 max_mididev = 0;
940 seq_mode = SEQ_2;
941 }
942
943 int sequencer_open(int dev, struct file *file)
944 {
945 int retval, mode, i;
946 int level, tmp;
947
948 if (!sequencer_ok)
949 sequencer_init();
950
951 level = ((dev & 0x0f) == SND_DEV_SEQ2) ? 2 : 1;
952
953 dev = dev >> 4;
954 mode = translate_mode(file);
955
956 DEB(printk("sequencer_open(dev=%d)\n", dev));
957
958 if (!sequencer_ok)
959 {
960 /* printk("Sound card: sequencer not initialized\n");*/
961 return -ENXIO;
962 }
963 if (dev) /* Patch manager device (obsolete) */
964 return -ENXIO;
965
966 if(synth_devs[dev] == NULL)
967 request_module("synth0");
968
969 if (mode == OPEN_READ)
970 {
971 if (!num_midis)
972 {
973 /*printk("Sequencer: No MIDI devices. Input not possible\n");*/
974 sequencer_busy = 0;
975 return -ENXIO;
976 }
977 }
978 if (sequencer_busy)
979 {
980 return -EBUSY;
981 }
982 sequencer_busy = 1;
983 obsolete_api_used = 0;
984
985 max_mididev = num_midis;
986 max_synthdev = num_synths;
987 pre_event_timeout = MAX_SCHEDULE_TIMEOUT;
988 seq_mode = SEQ_1;
989
990 if (pending_timer != -1)
991 {
992 tmr_no = pending_timer;
993 pending_timer = -1;
994 }
995 if (tmr_no == -1) /* Not selected yet */
996 {
997 int i, best;
998
999 best = -1;
1000 for (i = 0; i < num_sound_timers; i++)
1001 if (sound_timer_devs[i] && sound_timer_devs[i]->priority > best)
1002 {
1003 tmr_no = i;
1004 best = sound_timer_devs[i]->priority;
1005 }
1006 if (tmr_no == -1) /* Should not be */
1007 tmr_no = 0;
1008 }
1009 tmr = sound_timer_devs[tmr_no];
1010
1011 if (level == 2)
1012 {
1013 if (tmr == NULL)
1014 {
1015 /*printk("sequencer: No timer for level 2\n");*/
1016 sequencer_busy = 0;
1017 return -ENXIO;
1018 }
1019 setup_mode2();
1020 }
1021 if (!max_synthdev && !max_mididev)
1022 {
1023 sequencer_busy=0;
1024 return -ENXIO;
1025 }
1026
1027 synth_open_mask = 0;
1028
1029 for (i = 0; i < max_mididev; i++)
1030 {
1031 midi_opened[i] = 0;
1032 midi_written[i] = 0;
1033 }
1034
1035 for (i = 0; i < max_synthdev; i++)
1036 {
1037 if (synth_devs[i]==NULL)
1038 continue;
1039
1040 if (!try_module_get(synth_devs[i]->owner))
1041 continue;
1042
1043 if ((tmp = synth_devs[i]->open(i, mode)) < 0)
1044 {
1045 printk(KERN_WARNING "Sequencer: Warning! Cannot open synth device #%d (%d)\n", i, tmp);
1046 if (synth_devs[i]->midi_dev)
1047 printk(KERN_WARNING "(Maps to MIDI dev #%d)\n", synth_devs[i]->midi_dev);
1048 }
1049 else
1050 {
1051 synth_open_mask |= (1 << i);
1052 if (synth_devs[i]->midi_dev)
1053 midi_opened[synth_devs[i]->midi_dev] = 1;
1054 }
1055 }
1056
1057 seq_time = jiffies;
1058
1059 prev_input_time = 0;
1060 prev_event_time = 0;
1061
1062 if (seq_mode == SEQ_1 && (mode == OPEN_READ || mode == OPEN_READWRITE))
1063 {
1064 /*
1065 * Initialize midi input devices
1066 */
1067
1068 for (i = 0; i < max_mididev; i++)
1069 if (!midi_opened[i] && midi_devs[i])
1070 {
1071 if (!try_module_get(midi_devs[i]->owner))
1072 continue;
1073
1074 if ((retval = midi_devs[i]->open(i, mode,
1075 sequencer_midi_input, sequencer_midi_output)) >= 0)
1076 {
1077 midi_opened[i] = 1;
1078 }
1079 }
1080 }
1081
1082 if (seq_mode == SEQ_2) {
1083 if (try_module_get(tmr->owner))
1084 tmr->open(tmr_no, seq_mode);
1085 }
1086
1087 init_waitqueue_head(&seq_sleeper);
1088 init_waitqueue_head(&midi_sleeper);
1089 output_threshold = SEQ_MAX_QUEUE / 2;
1090
1091 return 0;
1092 }
1093
1094 static void seq_drain_midi_queues(void)
1095 {
1096 int i, n;
1097
1098 /*
1099 * Give the Midi drivers time to drain their output queues
1100 */
1101
1102 n = 1;
1103
1104 while (!signal_pending(current) && n)
1105 {
1106 n = 0;
1107
1108 for (i = 0; i < max_mididev; i++)
1109 if (midi_opened[i] && midi_written[i])
1110 if (midi_devs[i]->buffer_status != NULL)
1111 if (midi_devs[i]->buffer_status(i))
1112 n++;
1113
1114 /*
1115 * Let's have a delay
1116 */
1117
1118 if (n)
1119 interruptible_sleep_on_timeout(&seq_sleeper,
1120 HZ/10);
1121 }
1122 }
1123
1124 void sequencer_release(int dev, struct file *file)
1125 {
1126 int i;
1127 int mode = translate_mode(file);
1128
1129 dev = dev >> 4;
1130
1131 DEB(printk("sequencer_release(dev=%d)\n", dev));
1132
1133 /*
1134 * Wait until the queue is empty (if we don't have nonblock)
1135 */
1136
1137 if (mode != OPEN_READ && !(file->f_flags & O_NONBLOCK))
1138 {
1139 while (!signal_pending(current) && qlen > 0)
1140 {
1141 seq_sync();
1142 interruptible_sleep_on_timeout(&seq_sleeper,
1143 3*HZ);
1144 /* Extra delay */
1145 }
1146 }
1147
1148 if (mode != OPEN_READ)
1149 seq_drain_midi_queues(); /*
1150 * Ensure the output queues are empty
1151 */
1152 seq_reset();
1153 if (mode != OPEN_READ)
1154 seq_drain_midi_queues(); /*
1155 * Flush the all notes off messages
1156 */
1157
1158 for (i = 0; i < max_synthdev; i++)
1159 {
1160 if (synth_open_mask & (1 << i)) /*
1161 * Actually opened
1162 */
1163 if (synth_devs[i])
1164 {
1165 synth_devs[i]->close(i);
1166
1167 module_put(synth_devs[i]->owner);
1168
1169 if (synth_devs[i]->midi_dev)
1170 midi_opened[synth_devs[i]->midi_dev] = 0;
1171 }
1172 }
1173
1174 for (i = 0; i < max_mididev; i++)
1175 {
1176 if (midi_opened[i]) {
1177 midi_devs[i]->close(i);
1178 module_put(midi_devs[i]->owner);
1179 }
1180 }
1181
1182 if (seq_mode == SEQ_2) {
1183 tmr->close(tmr_no);
1184 module_put(tmr->owner);
1185 }
1186
1187 if (obsolete_api_used)
1188 printk(KERN_WARNING "/dev/music: Obsolete (4 byte) API was used by %s\n", current->comm);
1189 sequencer_busy = 0;
1190 }
1191
1192 static int seq_sync(void)
1193 {
1194 if (qlen && !seq_playing && !signal_pending(current))
1195 seq_startplay();
1196
1197 if (qlen > 0)
1198 interruptible_sleep_on_timeout(&seq_sleeper, HZ);
1199 return qlen;
1200 }
1201
1202 static void midi_outc(int dev, unsigned char data)
1203 {
1204 /*
1205 * NOTE! Calls sleep(). Don't call this from interrupt.
1206 */
1207
1208 int n;
1209 unsigned long flags;
1210
1211 /*
1212 * This routine sends one byte to the Midi channel.
1213 * If the output FIFO is full, it waits until there
1214 * is space in the queue
1215 */
1216
1217 n = 3 * HZ; /* Timeout */
1218
1219 spin_lock_irqsave(&lock,flags);
1220 while (n && !midi_devs[dev]->outputc(dev, data)) {
1221 interruptible_sleep_on_timeout(&seq_sleeper, HZ/25);
1222 n--;
1223 }
1224 spin_unlock_irqrestore(&lock,flags);
1225 }
1226
1227 static void seq_reset(void)
1228 {
1229 /*
1230 * NOTE! Calls sleep(). Don't call this from interrupt.
1231 */
1232
1233 int i;
1234 int chn;
1235 unsigned long flags;
1236
1237 sound_stop_timer();
1238
1239 seq_time = jiffies;
1240 prev_input_time = 0;
1241 prev_event_time = 0;
1242
1243 qlen = qhead = qtail = 0;
1244 iqlen = iqhead = iqtail = 0;
1245
1246 for (i = 0; i < max_synthdev; i++)
1247 if (synth_open_mask & (1 << i))
1248 if (synth_devs[i])
1249 synth_devs[i]->reset(i);
1250
1251 if (seq_mode == SEQ_2)
1252 {
1253 for (chn = 0; chn < 16; chn++)
1254 for (i = 0; i < max_synthdev; i++)
1255 if (synth_open_mask & (1 << i))
1256 if (synth_devs[i])
1257 {
1258 synth_devs[i]->controller(i, chn, 123, 0); /* All notes off */
1259 synth_devs[i]->controller(i, chn, 121, 0); /* Reset all ctl */
1260 synth_devs[i]->bender(i, chn, 1 << 13); /* Bender off */
1261 }
1262 }
1263 else /* seq_mode == SEQ_1 */
1264 {
1265 for (i = 0; i < max_mididev; i++)
1266 if (midi_written[i]) /*
1267 * Midi used. Some notes may still be playing
1268 */
1269 {
1270 /*
1271 * Sending just a ACTIVE SENSING message should be enough to stop all
1272 * playing notes. Since there are devices not recognizing the
1273 * active sensing, we have to send some all notes off messages also.
1274 */
1275 midi_outc(i, 0xfe);
1276
1277 for (chn = 0; chn < 16; chn++)
1278 {
1279 midi_outc(i, (unsigned char) (0xb0 + (chn & 0x0f))); /* control change */
1280 midi_outc(i, 0x7b); /* All notes off */
1281 midi_outc(i, 0); /* Dummy parameter */
1282 }
1283
1284 midi_devs[i]->close(i);
1285
1286 midi_written[i] = 0;
1287 midi_opened[i] = 0;
1288 }
1289 }
1290
1291 seq_playing = 0;
1292
1293 spin_lock_irqsave(&lock,flags);
1294
1295 if (waitqueue_active(&seq_sleeper)) {
1296 /* printk( "Sequencer Warning: Unexpected sleeping process - Waking up\n"); */
1297 wake_up(&seq_sleeper);
1298 }
1299 spin_unlock_irqrestore(&lock,flags);
1300 }
1301
1302 static void seq_panic(void)
1303 {
1304 /*
1305 * This routine is called by the application in case the user
1306 * wants to reset the system to the default state.
1307 */
1308
1309 seq_reset();
1310
1311 /*
1312 * Since some of the devices don't recognize the active sensing and
1313 * all notes off messages, we have to shut all notes manually.
1314 *
1315 * TO BE IMPLEMENTED LATER
1316 */
1317
1318 /*
1319 * Also return the controllers to their default states
1320 */
1321 }
1322
1323 int sequencer_ioctl(int dev, struct file *file, unsigned int cmd, void __user *arg)
1324 {
1325 int midi_dev, orig_dev, val, err;
1326 int mode = translate_mode(file);
1327 struct synth_info inf;
1328 struct seq_event_rec event_rec;
1329 unsigned long flags;
1330 int __user *p = arg;
1331
1332 orig_dev = dev = dev >> 4;
1333
1334 switch (cmd)
1335 {
1336 case SNDCTL_TMR_TIMEBASE:
1337 case SNDCTL_TMR_TEMPO:
1338 case SNDCTL_TMR_START:
1339 case SNDCTL_TMR_STOP:
1340 case SNDCTL_TMR_CONTINUE:
1341 case SNDCTL_TMR_METRONOME:
1342 case SNDCTL_TMR_SOURCE:
1343 if (seq_mode != SEQ_2)
1344 return -EINVAL;
1345 return tmr->ioctl(tmr_no, cmd, arg);
1346
1347 case SNDCTL_TMR_SELECT:
1348 if (seq_mode != SEQ_2)
1349 return -EINVAL;
1350 if (get_user(pending_timer, p))
1351 return -EFAULT;
1352 if (pending_timer < 0 || pending_timer >= num_sound_timers || sound_timer_devs[pending_timer] == NULL)
1353 {
1354 pending_timer = -1;
1355 return -EINVAL;
1356 }
1357 val = pending_timer;
1358 break;
1359
1360 case SNDCTL_SEQ_PANIC:
1361 seq_panic();
1362 return -EINVAL;
1363
1364 case SNDCTL_SEQ_SYNC:
1365 if (mode == OPEN_READ)
1366 return 0;
1367 while (qlen > 0 && !signal_pending(current))
1368 seq_sync();
1369 return qlen ? -EINTR : 0;
1370
1371 case SNDCTL_SEQ_RESET:
1372 seq_reset();
1373 return 0;
1374
1375 case SNDCTL_SEQ_TESTMIDI:
1376 if (__get_user(midi_dev, p))
1377 return -EFAULT;
1378 if (midi_dev < 0 || midi_dev >= max_mididev || !midi_devs[midi_dev])
1379 return -ENXIO;
1380
1381 if (!midi_opened[midi_dev] &&
1382 (err = midi_devs[midi_dev]->open(midi_dev, mode, sequencer_midi_input,
1383 sequencer_midi_output)) < 0)
1384 return err;
1385 midi_opened[midi_dev] = 1;
1386 return 0;
1387
1388 case SNDCTL_SEQ_GETINCOUNT:
1389 if (mode == OPEN_WRITE)
1390 return 0;
1391 val = iqlen;
1392 break;
1393
1394 case SNDCTL_SEQ_GETOUTCOUNT:
1395 if (mode == OPEN_READ)
1396 return 0;
1397 val = SEQ_MAX_QUEUE - qlen;
1398 break;
1399
1400 case SNDCTL_SEQ_GETTIME:
1401 if (seq_mode == SEQ_2)
1402 return tmr->ioctl(tmr_no, cmd, arg);
1403 val = jiffies - seq_time;
1404 break;
1405
1406 case SNDCTL_SEQ_CTRLRATE:
1407 /*
1408 * If *arg == 0, just return the current rate
1409 */
1410 if (seq_mode == SEQ_2)
1411 return tmr->ioctl(tmr_no, cmd, arg);
1412
1413 if (get_user(val, p))
1414 return -EFAULT;
1415 if (val != 0)
1416 return -EINVAL;
1417 val = HZ;
1418 break;
1419
1420 case SNDCTL_SEQ_RESETSAMPLES:
1421 case SNDCTL_SYNTH_REMOVESAMPLE:
1422 case SNDCTL_SYNTH_CONTROL:
1423 if (get_user(dev, p))
1424 return -EFAULT;
1425 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1426 return -ENXIO;
1427 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1428 return -EBUSY;
1429 return synth_devs[dev]->ioctl(dev, cmd, arg);
1430
1431 case SNDCTL_SEQ_NRSYNTHS:
1432 val = max_synthdev;
1433 break;
1434
1435 case SNDCTL_SEQ_NRMIDIS:
1436 val = max_mididev;
1437 break;
1438
1439 case SNDCTL_SYNTH_MEMAVL:
1440 if (get_user(dev, p))
1441 return -EFAULT;
1442 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1443 return -ENXIO;
1444 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1445 return -EBUSY;
1446 val = synth_devs[dev]->ioctl(dev, cmd, arg);
1447 break;
1448
1449 case SNDCTL_FM_4OP_ENABLE:
1450 if (get_user(dev, p))
1451 return -EFAULT;
1452 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1453 return -ENXIO;
1454 if (!(synth_open_mask & (1 << dev)))
1455 return -ENXIO;
1456 synth_devs[dev]->ioctl(dev, cmd, arg);
1457 return 0;
1458
1459 case SNDCTL_SYNTH_INFO:
1460 if (get_user(dev, &((struct synth_info __user *)arg)->device))
1461 return -EFAULT;
1462 if (dev < 0 || dev >= max_synthdev)
1463 return -ENXIO;
1464 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1465 return -EBUSY;
1466 return synth_devs[dev]->ioctl(dev, cmd, arg);
1467
1468 /* Like SYNTH_INFO but returns ID in the name field */
1469 case SNDCTL_SYNTH_ID:
1470 if (get_user(dev, &((struct synth_info __user *)arg)->device))
1471 return -EFAULT;
1472 if (dev < 0 || dev >= max_synthdev)
1473 return -ENXIO;
1474 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1475 return -EBUSY;
1476 memcpy(&inf, synth_devs[dev]->info, sizeof(inf));
1477 strlcpy(inf.name, synth_devs[dev]->id, sizeof(inf.name));
1478 inf.device = dev;
1479 return copy_to_user(arg, &inf, sizeof(inf))?-EFAULT:0;
1480
1481 case SNDCTL_SEQ_OUTOFBAND:
1482 if (copy_from_user(&event_rec, arg, sizeof(event_rec)))
1483 return -EFAULT;
1484 spin_lock_irqsave(&lock,flags);
1485 play_event(event_rec.arr);
1486 spin_unlock_irqrestore(&lock,flags);
1487 return 0;
1488
1489 case SNDCTL_MIDI_INFO:
1490 if (get_user(dev, &((struct midi_info __user *)arg)->device))
1491 return -EFAULT;
1492 if (dev < 0 || dev >= max_mididev || !midi_devs[dev])
1493 return -ENXIO;
1494 midi_devs[dev]->info.device = dev;
1495 return copy_to_user(arg, &midi_devs[dev]->info, sizeof(struct midi_info))?-EFAULT:0;
1496
1497 case SNDCTL_SEQ_THRESHOLD:
1498 if (get_user(val, p))
1499 return -EFAULT;
1500 if (val < 1)
1501 val = 1;
1502 if (val >= SEQ_MAX_QUEUE)
1503 val = SEQ_MAX_QUEUE - 1;
1504 output_threshold = val;
1505 return 0;
1506
1507 case SNDCTL_MIDI_PRETIME:
1508 if (get_user(val, p))
1509 return -EFAULT;
1510 if (val < 0)
1511 val = 0;
1512 val = (HZ * val) / 10;
1513 pre_event_timeout = val;
1514 break;
1515
1516 default:
1517 if (mode == OPEN_READ)
1518 return -EIO;
1519 if (!synth_devs[0])
1520 return -ENXIO;
1521 if (!(synth_open_mask & (1 << 0)))
1522 return -ENXIO;
1523 if (!synth_devs[0]->ioctl)
1524 return -EINVAL;
1525 return synth_devs[0]->ioctl(0, cmd, arg);
1526 }
1527 return put_user(val, p);
1528 }
1529
1530 /* No kernel lock - we're using the global irq lock here */
1531 unsigned int sequencer_poll(int dev, struct file *file, poll_table * wait)
1532 {
1533 unsigned long flags;
1534 unsigned int mask = 0;
1535
1536 dev = dev >> 4;
1537
1538 spin_lock_irqsave(&lock,flags);
1539 /* input */
1540 poll_wait(file, &midi_sleeper, wait);
1541 if (iqlen)
1542 mask |= POLLIN | POLLRDNORM;
1543
1544 /* output */
1545 poll_wait(file, &seq_sleeper, wait);
1546 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
1547 mask |= POLLOUT | POLLWRNORM;
1548 spin_unlock_irqrestore(&lock,flags);
1549 return mask;
1550 }
1551
1552
1553 void sequencer_timer(unsigned long dummy)
1554 {
1555 seq_startplay();
1556 }
1557 EXPORT_SYMBOL(sequencer_timer);
1558
1559 int note_to_freq(int note_num)
1560 {
1561
1562 /*
1563 * This routine converts a midi note to a frequency (multiplied by 1000)
1564 */
1565
1566 int note, octave, note_freq;
1567 static int notes[] =
1568 {
1569 261632, 277189, 293671, 311132, 329632, 349232,
1570 369998, 391998, 415306, 440000, 466162, 493880
1571 };
1572
1573 #define BASE_OCTAVE 5
1574
1575 octave = note_num / 12;
1576 note = note_num % 12;
1577
1578 note_freq = notes[note];
1579
1580 if (octave < BASE_OCTAVE)
1581 note_freq >>= (BASE_OCTAVE - octave);
1582 else if (octave > BASE_OCTAVE)
1583 note_freq <<= (octave - BASE_OCTAVE);
1584
1585 /*
1586 * note_freq >>= 1;
1587 */
1588
1589 return note_freq;
1590 }
1591 EXPORT_SYMBOL(note_to_freq);
1592
1593 unsigned long compute_finetune(unsigned long base_freq, int bend, int range,
1594 int vibrato_cents)
1595 {
1596 unsigned long amount;
1597 int negative, semitones, cents, multiplier = 1;
1598
1599 if (!bend)
1600 return base_freq;
1601 if (!range)
1602 return base_freq;
1603
1604 if (!base_freq)
1605 return base_freq;
1606
1607 if (range >= 8192)
1608 range = 8192;
1609
1610 bend = bend * range / 8192; /* Convert to cents */
1611 bend += vibrato_cents;
1612
1613 if (!bend)
1614 return base_freq;
1615
1616 negative = bend < 0 ? 1 : 0;
1617
1618 if (bend < 0)
1619 bend *= -1;
1620 if (bend > range)
1621 bend = range;
1622
1623 /*
1624 if (bend > 2399)
1625 bend = 2399;
1626 */
1627 while (bend > 2399)
1628 {
1629 multiplier *= 4;
1630 bend -= 2400;
1631 }
1632
1633 semitones = bend / 100;
1634 cents = bend % 100;
1635
1636 amount = (int) (semitone_tuning[semitones] * multiplier * cent_tuning[cents]) / 10000;
1637
1638 if (negative)
1639 return (base_freq * 10000) / amount; /* Bend down */
1640 else
1641 return (base_freq * amount) / 10000; /* Bend up */
1642 }
1643 EXPORT_SYMBOL(compute_finetune);
1644
1645 void sequencer_init(void)
1646 {
1647 if (sequencer_ok)
1648 return;
1649 queue = vmalloc(SEQ_MAX_QUEUE * EV_SZ);
1650 if (queue == NULL)
1651 {
1652 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer output queue\n");
1653 return;
1654 }
1655 iqueue = vmalloc(SEQ_MAX_QUEUE * IEV_SZ);
1656 if (iqueue == NULL)
1657 {
1658 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer input queue\n");
1659 vfree(queue);
1660 return;
1661 }
1662 sequencer_ok = 1;
1663 }
1664 EXPORT_SYMBOL(sequencer_init);
1665
1666 void sequencer_unload(void)
1667 {
1668 vfree(queue);
1669 vfree(iqueue);
1670 queue = iqueue = NULL;
1671 }