File: /usr/src/linux/drivers/sound/sequencer.c
1 /*
2 * sound/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
19 #define SEQUENCER_C
20 #include "sound_config.h"
21
22 #include "midi_ctrl.h"
23
24 static int sequencer_ok = 0;
25 static struct sound_timer_operations *tmr;
26 static int tmr_no = -1; /* Currently selected timer */
27 static int pending_timer = -1; /* For timer change operation */
28 extern unsigned long seq_time;
29
30 static int obsolete_api_used = 0;
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 = 0;
37 static int max_synthdev = 0;
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 0
54 };
55
56 static int midi_written[MAX_MIDI_DEV] = {
57 0
58 };
59
60 static unsigned long prev_input_time = 0;
61 static int prev_event_time;
62
63 #include "tuning.h"
64
65 #define EV_SZ 8
66 #define IEV_SZ 8
67
68 static unsigned char *queue = NULL;
69 static unsigned char *iqueue = NULL;
70
71 static volatile int qhead = 0, qtail = 0, qlen = 0;
72 static volatile int iqhead = 0, iqtail = 0, iqlen = 0;
73 static volatile int seq_playing = 0;
74 static volatile int sequencer_busy = 0;
75 static int output_threshold;
76 static long pre_event_timeout;
77 static unsigned synth_open_mask;
78
79 static int seq_queue(unsigned char *note, char nonblock);
80 static void seq_startplay(void);
81 static int seq_sync(void);
82 static void seq_reset(void);
83
84 #if MAX_SYNTH_DEV > 15
85 #error Too many synthesizer devices enabled.
86 #endif
87
88 int sequencer_read(int dev, struct file *file, char *buf, int count)
89 {
90 int c = count, p = 0;
91 int ev_len;
92 unsigned long flags;
93
94 dev = dev >> 4;
95
96 ev_len = seq_mode == SEQ_1 ? 4 : 8;
97
98 save_flags(flags);
99 cli();
100
101 if (!iqlen)
102 {
103 if (file->f_flags & O_NONBLOCK) {
104 restore_flags(flags);
105 return -EAGAIN;
106 }
107
108 interruptible_sleep_on_timeout(&midi_sleeper,
109 pre_event_timeout);
110 if (!iqlen)
111 {
112 restore_flags(flags);
113 return 0;
114 }
115 }
116 while (iqlen && c >= ev_len)
117 {
118 char *fixit = (char *) &iqueue[iqhead * IEV_SZ];
119 copy_to_user(&(buf)[p], fixit, ev_len);
120 p += ev_len;
121 c -= ev_len;
122
123 iqhead = (iqhead + 1) % SEQ_MAX_QUEUE;
124 iqlen--;
125 }
126 restore_flags(flags);
127 return count - c;
128 }
129
130 static void sequencer_midi_output(int dev)
131 {
132 /*
133 * Currently NOP
134 */
135 }
136
137 void seq_copy_to_input(unsigned char *event_rec, int len)
138 {
139 unsigned long flags;
140
141 /*
142 * Verify that the len is valid for the current mode.
143 */
144
145 if (len != 4 && len != 8)
146 return;
147 if ((seq_mode == SEQ_1) != (len == 4))
148 return;
149
150 if (iqlen >= (SEQ_MAX_QUEUE - 1))
151 return; /* Overflow */
152
153 save_flags(flags);
154 cli();
155 memcpy(&iqueue[iqtail * IEV_SZ], event_rec, len);
156 iqlen++;
157 iqtail = (iqtail + 1) % SEQ_MAX_QUEUE;
158 wake_up(&midi_sleeper);
159 restore_flags(flags);
160 }
161
162 static void sequencer_midi_input(int dev, unsigned char data)
163 {
164 unsigned int tstamp;
165 unsigned char event_rec[4];
166
167 if (data == 0xfe) /* Ignore active sensing */
168 return;
169
170 tstamp = jiffies - seq_time;
171
172 if (tstamp != prev_input_time)
173 {
174 tstamp = (tstamp << 8) | SEQ_WAIT;
175 seq_copy_to_input((unsigned char *) &tstamp, 4);
176 prev_input_time = tstamp;
177 }
178 event_rec[0] = SEQ_MIDIPUTC;
179 event_rec[1] = data;
180 event_rec[2] = dev;
181 event_rec[3] = 0;
182
183 seq_copy_to_input(event_rec, 4);
184 }
185
186 void seq_input_event(unsigned char *event_rec, int len)
187 {
188 unsigned long this_time;
189
190 if (seq_mode == SEQ_2)
191 this_time = tmr->get_time(tmr_no);
192 else
193 this_time = jiffies - seq_time;
194
195 if (this_time != prev_input_time)
196 {
197 unsigned char tmp_event[8];
198
199 tmp_event[0] = EV_TIMING;
200 tmp_event[1] = TMR_WAIT_ABS;
201 tmp_event[2] = 0;
202 tmp_event[3] = 0;
203 *(unsigned int *) &tmp_event[4] = this_time;
204
205 seq_copy_to_input(tmp_event, 8);
206 prev_input_time = this_time;
207 }
208 seq_copy_to_input(event_rec, len);
209 }
210
211 int sequencer_write(int dev, struct file *file, const char *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 copy_from_user((char *) event_rec, &(buf)[p], 4);
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 copy_from_user((char *) &event_rec[4], &(buf)[p + 4], 4);
266
267 }
268 else
269 {
270 if (seq_mode == SEQ_2)
271 {
272 printk(KERN_WARNING "Sequencer: 4 byte event in level 2 mode\n");
273 return -EINVAL;
274 }
275 ev_size = 4;
276
277 if (event_rec[0] != SEQ_MIDIPUTC)
278 obsolete_api_used = 1;
279 }
280
281 if (event_rec[0] == SEQ_MIDIPUTC)
282 {
283 if (!midi_opened[event_rec[2]])
284 {
285 int mode;
286 int dev = event_rec[2];
287
288 if (dev >= max_mididev || midi_devs[dev]==NULL)
289 {
290 /*printk("Sequencer Error: Nonexistent MIDI device %d\n", dev);*/
291 return -ENXIO;
292 }
293 mode = translate_mode(file);
294
295 if ((err = midi_devs[dev]->open(dev, mode,
296 sequencer_midi_input, sequencer_midi_output)) < 0)
297 {
298 seq_reset();
299 printk(KERN_WARNING "Sequencer Error: Unable to open Midi #%d\n", dev);
300 return err;
301 }
302 midi_opened[dev] = 1;
303 }
304 }
305 if (!seq_queue(event_rec, (file->f_flags & (O_NONBLOCK) ? 1 : 0)))
306 {
307 int processed = count - c;
308
309 if (!seq_playing)
310 seq_startplay();
311
312 if (!processed && (file->f_flags & O_NONBLOCK))
313 return -EAGAIN;
314 else
315 return processed;
316 }
317 p += ev_size;
318 c -= ev_size;
319 }
320
321 if (!seq_playing)
322 seq_startplay();
323
324 return count;
325 }
326
327 static int seq_queue(unsigned char *note, char nonblock)
328 {
329
330 /*
331 * Test if there is space in the queue
332 */
333
334 if (qlen >= SEQ_MAX_QUEUE)
335 if (!seq_playing)
336 seq_startplay(); /*
337 * Give chance to drain the queue
338 */
339
340 if (!nonblock && qlen >= SEQ_MAX_QUEUE && !waitqueue_active(&seq_sleeper)) {
341 /*
342 * Sleep until there is enough space on the queue
343 */
344 interruptible_sleep_on(&seq_sleeper);
345 }
346 if (qlen >= SEQ_MAX_QUEUE)
347 {
348 return 0; /*
349 * To be sure
350 */
351 }
352 memcpy(&queue[qtail * EV_SZ], note, EV_SZ);
353
354 qtail = (qtail + 1) % SEQ_MAX_QUEUE;
355 qlen++;
356
357 return 1;
358 }
359
360 static int extended_event(unsigned char *q)
361 {
362 int dev = q[2];
363
364 if (dev < 0 || dev >= max_synthdev)
365 return -ENXIO;
366
367 if (!(synth_open_mask & (1 << dev)))
368 return -ENXIO;
369
370 switch (q[1])
371 {
372 case SEQ_NOTEOFF:
373 synth_devs[dev]->kill_note(dev, q[3], q[4], q[5]);
374 break;
375
376 case SEQ_NOTEON:
377 if (q[4] > 127 && q[4] != 255)
378 return 0;
379
380 if (q[5] == 0)
381 {
382 synth_devs[dev]->kill_note(dev, q[3], q[4], q[5]);
383 break;
384 }
385 synth_devs[dev]->start_note(dev, q[3], q[4], q[5]);
386 break;
387
388 case SEQ_PGMCHANGE:
389 synth_devs[dev]->set_instr(dev, q[3], q[4]);
390 break;
391
392 case SEQ_AFTERTOUCH:
393 synth_devs[dev]->aftertouch(dev, q[3], q[4]);
394 break;
395
396 case SEQ_BALANCE:
397 synth_devs[dev]->panning(dev, q[3], (char) q[4]);
398 break;
399
400 case SEQ_CONTROLLER:
401 synth_devs[dev]->controller(dev, q[3], q[4], (short) (q[5] | (q[6] << 8)));
402 break;
403
404 case SEQ_VOLMODE:
405 if (synth_devs[dev]->volume_method != NULL)
406 synth_devs[dev]->volume_method(dev, q[3]);
407 break;
408
409 default:
410 return -EINVAL;
411 }
412 return 0;
413 }
414
415 static int find_voice(int dev, int chn, int note)
416 {
417 unsigned short key;
418 int i;
419
420 key = (chn << 8) | (note + 1);
421 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
422 if (synth_devs[dev]->alloc.map[i] == key)
423 return i;
424 return -1;
425 }
426
427 static int alloc_voice(int dev, int chn, int note)
428 {
429 unsigned short key;
430 int voice;
431
432 key = (chn << 8) | (note + 1);
433
434 voice = synth_devs[dev]->alloc_voice(dev, chn, note,
435 &synth_devs[dev]->alloc);
436 synth_devs[dev]->alloc.map[voice] = key;
437 synth_devs[dev]->alloc.alloc_times[voice] =
438 synth_devs[dev]->alloc.timestamp++;
439 return voice;
440 }
441
442 static void seq_chn_voice_event(unsigned char *event_rec)
443 {
444 #define dev event_rec[1]
445 #define cmd event_rec[2]
446 #define chn event_rec[3]
447 #define note event_rec[4]
448 #define parm event_rec[5]
449
450 int voice = -1;
451
452 if ((int) dev > max_synthdev || synth_devs[dev] == NULL)
453 return;
454 if (!(synth_open_mask & (1 << dev)))
455 return;
456 if (!synth_devs[dev])
457 return;
458
459 if (seq_mode == SEQ_2)
460 {
461 if (synth_devs[dev]->alloc_voice)
462 voice = find_voice(dev, chn, note);
463
464 if (cmd == MIDI_NOTEON && parm == 0)
465 {
466 cmd = MIDI_NOTEOFF;
467 parm = 64;
468 }
469 }
470
471 switch (cmd)
472 {
473 case MIDI_NOTEON:
474 if (note > 127 && note != 255) /* Not a seq2 feature */
475 return;
476
477 if (voice == -1 && seq_mode == SEQ_2 && synth_devs[dev]->alloc_voice)
478 {
479 /* Internal synthesizer (FM, GUS, etc) */
480 voice = alloc_voice(dev, chn, note);
481 }
482 if (voice == -1)
483 voice = chn;
484
485 if (seq_mode == SEQ_2 && (int) dev < num_synths)
486 {
487 /*
488 * The MIDI channel 10 is a percussive channel. Use the note
489 * number to select the proper patch (128 to 255) to play.
490 */
491
492 if (chn == 9)
493 {
494 synth_devs[dev]->set_instr(dev, voice, 128 + note);
495 synth_devs[dev]->chn_info[chn].pgm_num = 128 + note;
496 }
497 synth_devs[dev]->setup_voice(dev, voice, chn);
498 }
499 synth_devs[dev]->start_note(dev, voice, note, parm);
500 break;
501
502 case MIDI_NOTEOFF:
503 if (voice == -1)
504 voice = chn;
505 synth_devs[dev]->kill_note(dev, voice, note, parm);
506 break;
507
508 case MIDI_KEY_PRESSURE:
509 if (voice == -1)
510 voice = chn;
511 synth_devs[dev]->aftertouch(dev, voice, parm);
512 break;
513
514 default:;
515 }
516 #undef dev
517 #undef cmd
518 #undef chn
519 #undef note
520 #undef parm
521 }
522
523
524 static void seq_chn_common_event(unsigned char *event_rec)
525 {
526 unsigned char dev = event_rec[1];
527 unsigned char cmd = event_rec[2];
528 unsigned char chn = event_rec[3];
529 unsigned char p1 = event_rec[4];
530
531 /* unsigned char p2 = event_rec[5]; */
532 unsigned short w14 = *(short *) &event_rec[6];
533
534 if ((int) dev > max_synthdev || synth_devs[dev] == NULL)
535 return;
536 if (!(synth_open_mask & (1 << dev)))
537 return;
538 if (!synth_devs[dev])
539 return;
540
541 switch (cmd)
542 {
543 case MIDI_PGM_CHANGE:
544 if (seq_mode == SEQ_2)
545 {
546 synth_devs[dev]->chn_info[chn].pgm_num = p1;
547 if ((int) dev >= num_synths)
548 synth_devs[dev]->set_instr(dev, chn, p1);
549 }
550 else
551 synth_devs[dev]->set_instr(dev, chn, p1);
552
553 break;
554
555 case MIDI_CTL_CHANGE:
556 if (seq_mode == SEQ_2)
557 {
558 if (chn > 15 || p1 > 127)
559 break;
560
561 synth_devs[dev]->chn_info[chn].controllers[p1] = w14 & 0x7f;
562
563 if (p1 < 32) /* Setting MSB should clear LSB to 0 */
564 synth_devs[dev]->chn_info[chn].controllers[p1 + 32] = 0;
565
566 if ((int) dev < num_synths)
567 {
568 int val = w14 & 0x7f;
569 int i, key;
570
571 if (p1 < 64) /* Combine MSB and LSB */
572 {
573 val = ((synth_devs[dev]->
574 chn_info[chn].controllers[p1 & ~32] & 0x7f) << 7)
575 | (synth_devs[dev]->
576 chn_info[chn].controllers[p1 | 32] & 0x7f);
577 p1 &= ~32;
578 }
579 /* Handle all playing notes on this channel */
580
581 key = ((int) chn << 8);
582
583 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
584 if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
585 synth_devs[dev]->controller(dev, i, p1, val);
586 }
587 else
588 synth_devs[dev]->controller(dev, chn, p1, w14);
589 }
590 else /* Mode 1 */
591 synth_devs[dev]->controller(dev, chn, p1, w14);
592 break;
593
594 case MIDI_PITCH_BEND:
595 if (seq_mode == SEQ_2)
596 {
597 synth_devs[dev]->chn_info[chn].bender_value = w14;
598
599 if ((int) dev < num_synths)
600 {
601 /* Handle all playing notes on this channel */
602 int i, key;
603
604 key = (chn << 8);
605
606 for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
607 if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
608 synth_devs[dev]->bender(dev, i, w14);
609 }
610 else
611 synth_devs[dev]->bender(dev, chn, w14);
612 }
613 else /* MODE 1 */
614 synth_devs[dev]->bender(dev, chn, w14);
615 break;
616
617 default:;
618 }
619 }
620
621 static int seq_timing_event(unsigned char *event_rec)
622 {
623 unsigned char cmd = event_rec[1];
624 unsigned int parm = *(int *) &event_rec[4];
625
626 if (seq_mode == SEQ_2)
627 {
628 int ret;
629
630 if ((ret = tmr->event(tmr_no, event_rec)) == TIMER_ARMED)
631 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
632 wake_up(&seq_sleeper);
633 return ret;
634 }
635 switch (cmd)
636 {
637 case TMR_WAIT_REL:
638 parm += prev_event_time;
639
640 /*
641 * NOTE! No break here. Execution of TMR_WAIT_REL continues in the
642 * next case (TMR_WAIT_ABS)
643 */
644
645 case TMR_WAIT_ABS:
646 if (parm > 0)
647 {
648 long time;
649
650 time = parm;
651 prev_event_time = time;
652
653 seq_playing = 1;
654 request_sound_timer(time);
655
656 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
657 wake_up(&seq_sleeper);
658 return TIMER_ARMED;
659 }
660 break;
661
662 case TMR_START:
663 seq_time = jiffies;
664 prev_input_time = 0;
665 prev_event_time = 0;
666 break;
667
668 case TMR_STOP:
669 break;
670
671 case TMR_CONTINUE:
672 break;
673
674 case TMR_TEMPO:
675 break;
676
677 case TMR_ECHO:
678 if (seq_mode == SEQ_2)
679 seq_copy_to_input(event_rec, 8);
680 else
681 {
682 parm = (parm << 8 | SEQ_ECHO);
683 seq_copy_to_input((unsigned char *) &parm, 4);
684 }
685 break;
686
687 default:;
688 }
689
690 return TIMER_NOT_ARMED;
691 }
692
693 static void seq_local_event(unsigned char *event_rec)
694 {
695 unsigned char cmd = event_rec[1];
696 unsigned int parm = *((unsigned int *) &event_rec[4]);
697
698 switch (cmd)
699 {
700 case LOCL_STARTAUDIO:
701 DMAbuf_start_devices(parm);
702 break;
703
704 default:;
705 }
706 }
707
708 static void seq_sysex_message(unsigned char *event_rec)
709 {
710 int dev = event_rec[1];
711 int i, l = 0;
712 unsigned char *buf = &event_rec[2];
713
714 if ((int) dev > max_synthdev)
715 return;
716 if (!(synth_open_mask & (1 << dev)))
717 return;
718 if (!synth_devs[dev])
719 return;
720
721 l = 0;
722 for (i = 0; i < 6 && buf[i] != 0xff; i++)
723 l = i + 1;
724
725 if (!synth_devs[dev]->send_sysex)
726 return;
727 if (l > 0)
728 synth_devs[dev]->send_sysex(dev, buf, l);
729 }
730
731 static int play_event(unsigned char *q)
732 {
733 /*
734 * NOTE! This routine returns
735 * 0 = normal event played.
736 * 1 = Timer armed. Suspend playback until timer callback.
737 * 2 = MIDI output buffer full. Restore queue and suspend until timer
738 */
739 unsigned int *delay;
740
741 switch (q[0])
742 {
743 case SEQ_NOTEOFF:
744 if (synth_open_mask & (1 << 0))
745 if (synth_devs[0])
746 synth_devs[0]->kill_note(0, q[1], 255, q[3]);
747 break;
748
749 case SEQ_NOTEON:
750 if (q[4] < 128 || q[4] == 255)
751 if (synth_open_mask & (1 << 0))
752 if (synth_devs[0])
753 synth_devs[0]->start_note(0, q[1], q[2], q[3]);
754 break;
755
756 case SEQ_WAIT:
757 delay = (unsigned int *) q; /*
758 * Bytes 1 to 3 are containing the *
759 * delay in 'ticks'
760 */
761 *delay = (*delay >> 8) & 0xffffff;
762
763 if (*delay > 0)
764 {
765 long time;
766
767 seq_playing = 1;
768 time = *delay;
769 prev_event_time = time;
770
771 request_sound_timer(time);
772
773 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
774 wake_up(&seq_sleeper);
775 /*
776 * The timer is now active and will reinvoke this function
777 * after the timer expires. Return to the caller now.
778 */
779 return 1;
780 }
781 break;
782
783 case SEQ_PGMCHANGE:
784 if (synth_open_mask & (1 << 0))
785 if (synth_devs[0])
786 synth_devs[0]->set_instr(0, q[1], q[2]);
787 break;
788
789 case SEQ_SYNCTIMER: /*
790 * Reset timer
791 */
792 seq_time = jiffies;
793 prev_input_time = 0;
794 prev_event_time = 0;
795 break;
796
797 case SEQ_MIDIPUTC: /*
798 * Put a midi character
799 */
800 if (midi_opened[q[2]])
801 {
802 int dev;
803
804 dev = q[2];
805
806 if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
807 break;
808
809 if (!midi_devs[dev]->outputc(dev, q[1]))
810 {
811 /*
812 * Output FIFO is full. Wait one timer cycle and try again.
813 */
814
815 seq_playing = 1;
816 request_sound_timer(-1);
817 return 2;
818 }
819 else
820 midi_written[dev] = 1;
821 }
822 break;
823
824 case SEQ_ECHO:
825 seq_copy_to_input(q, 4); /*
826 * Echo back to the process
827 */
828 break;
829
830 case SEQ_PRIVATE:
831 if ((int) q[1] < max_synthdev)
832 synth_devs[q[1]]->hw_control(q[1], q);
833 break;
834
835 case SEQ_EXTENDED:
836 extended_event(q);
837 break;
838
839 case EV_CHN_VOICE:
840 seq_chn_voice_event(q);
841 break;
842
843 case EV_CHN_COMMON:
844 seq_chn_common_event(q);
845 break;
846
847 case EV_TIMING:
848 if (seq_timing_event(q) == TIMER_ARMED)
849 {
850 return 1;
851 }
852 break;
853
854 case EV_SEQ_LOCAL:
855 seq_local_event(q);
856 break;
857
858 case EV_SYSEX:
859 seq_sysex_message(q);
860 break;
861
862 default:;
863 }
864 return 0;
865 }
866
867 static void seq_startplay(void)
868 {
869 unsigned long flags;
870 int this_one, action;
871
872 while (qlen > 0)
873 {
874
875 save_flags(flags);
876 cli();
877 qhead = ((this_one = qhead) + 1) % SEQ_MAX_QUEUE;
878 qlen--;
879 restore_flags(flags);
880
881 seq_playing = 1;
882
883 if ((action = play_event(&queue[this_one * EV_SZ])))
884 { /* Suspend playback. Next timer routine invokes this routine again */
885 if (action == 2)
886 {
887 qlen++;
888 qhead = this_one;
889 }
890 return;
891 }
892 }
893
894 seq_playing = 0;
895
896 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
897 wake_up(&seq_sleeper);
898 }
899
900 static void reset_controllers(int dev, unsigned char *controller, int update_dev)
901 {
902 int i;
903 for (i = 0; i < 128; i++)
904 controller[i] = ctrl_def_values[i];
905 }
906
907 static void setup_mode2(void)
908 {
909 int dev;
910
911 max_synthdev = num_synths;
912
913 for (dev = 0; dev < num_midis; dev++)
914 {
915 if (midi_devs[dev] && midi_devs[dev]->converter != NULL)
916 {
917 synth_devs[max_synthdev++] = midi_devs[dev]->converter;
918 }
919 }
920
921 for (dev = 0; dev < max_synthdev; dev++)
922 {
923 int chn;
924
925 synth_devs[dev]->sysex_ptr = 0;
926 synth_devs[dev]->emulation = 0;
927
928 for (chn = 0; chn < 16; chn++)
929 {
930 synth_devs[dev]->chn_info[chn].pgm_num = 0;
931 reset_controllers(dev,
932 synth_devs[dev]->chn_info[chn].controllers,0);
933 synth_devs[dev]->chn_info[chn].bender_value = (1 << 7); /* Neutral */
934 synth_devs[dev]->chn_info[chn].bender_range = 200;
935 }
936 }
937 max_mididev = 0;
938 seq_mode = SEQ_2;
939 }
940
941 int sequencer_open(int dev, struct file *file)
942 {
943 int retval, mode, i;
944 int level, tmp;
945 unsigned long flags;
946
947 if (!sequencer_ok)
948 sequencer_init();
949
950 level = ((dev & 0x0f) == SND_DEV_SEQ2) ? 2 : 1;
951
952 dev = dev >> 4;
953 mode = translate_mode(file);
954
955 DEB(printk("sequencer_open(dev=%d)\n", dev));
956
957 if (!sequencer_ok)
958 {
959 /* printk("Sound card: sequencer not initialized\n");*/
960 return -ENXIO;
961 }
962 if (dev) /* Patch manager device (obsolete) */
963 return -ENXIO;
964
965 if(synth_devs[dev] == NULL)
966 request_module("synth0");
967
968 if (mode == OPEN_READ)
969 {
970 if (!num_midis)
971 {
972 /*printk("Sequencer: No MIDI devices. Input not possible\n");*/
973 sequencer_busy = 0;
974 return -ENXIO;
975 }
976 }
977 save_flags(flags);
978 cli();
979 if (sequencer_busy)
980 {
981 restore_flags(flags);
982 return -EBUSY;
983 }
984 sequencer_busy = 1;
985 obsolete_api_used = 0;
986 restore_flags(flags);
987
988 max_mididev = num_midis;
989 max_synthdev = num_synths;
990 pre_event_timeout = MAX_SCHEDULE_TIMEOUT;
991 seq_mode = SEQ_1;
992
993 if (pending_timer != -1)
994 {
995 tmr_no = pending_timer;
996 pending_timer = -1;
997 }
998 if (tmr_no == -1) /* Not selected yet */
999 {
1000 int i, best;
1001
1002 best = -1;
1003 for (i = 0; i < num_sound_timers; i++)
1004 if (sound_timer_devs[i] && sound_timer_devs[i]->priority > best)
1005 {
1006 tmr_no = i;
1007 best = sound_timer_devs[i]->priority;
1008 }
1009 if (tmr_no == -1) /* Should not be */
1010 tmr_no = 0;
1011 }
1012 tmr = sound_timer_devs[tmr_no];
1013
1014 if (level == 2)
1015 {
1016 if (tmr == NULL)
1017 {
1018 /*printk("sequencer: No timer for level 2\n");*/
1019 sequencer_busy = 0;
1020 return -ENXIO;
1021 }
1022 setup_mode2();
1023 }
1024 if (!max_synthdev && !max_mididev)
1025 {
1026 sequencer_busy=0;
1027 return -ENXIO;
1028 }
1029
1030 synth_open_mask = 0;
1031
1032 for (i = 0; i < max_mididev; i++)
1033 {
1034 midi_opened[i] = 0;
1035 midi_written[i] = 0;
1036 }
1037
1038 for (i = 0; i < max_synthdev; i++)
1039 {
1040 if (synth_devs[i]==NULL)
1041 continue;
1042
1043 if (synth_devs[i]->owner)
1044 __MOD_INC_USE_COUNT (synth_devs[i]->owner);
1045
1046 if ((tmp = synth_devs[i]->open(i, mode)) < 0)
1047 {
1048 printk(KERN_WARNING "Sequencer: Warning! Cannot open synth device #%d (%d)\n", i, tmp);
1049 if (synth_devs[i]->midi_dev)
1050 printk(KERN_WARNING "(Maps to MIDI dev #%d)\n", synth_devs[i]->midi_dev);
1051 }
1052 else
1053 {
1054 synth_open_mask |= (1 << i);
1055 if (synth_devs[i]->midi_dev)
1056 midi_opened[synth_devs[i]->midi_dev] = 1;
1057 }
1058 }
1059
1060 seq_time = jiffies;
1061
1062 prev_input_time = 0;
1063 prev_event_time = 0;
1064
1065 if (seq_mode == SEQ_1 && (mode == OPEN_READ || mode == OPEN_READWRITE))
1066 {
1067 /*
1068 * Initialize midi input devices
1069 */
1070
1071 for (i = 0; i < max_mididev; i++)
1072 if (!midi_opened[i] && midi_devs[i])
1073 {
1074 if (midi_devs[i]->owner)
1075 __MOD_INC_USE_COUNT (midi_devs[i]->owner);
1076
1077 if ((retval = midi_devs[i]->open(i, mode,
1078 sequencer_midi_input, sequencer_midi_output)) >= 0)
1079 {
1080 midi_opened[i] = 1;
1081 }
1082 }
1083 }
1084
1085 if (seq_mode == SEQ_2) {
1086 if (tmr->owner)
1087 __MOD_INC_USE_COUNT (tmr->owner);
1088 tmr->open(tmr_no, seq_mode);
1089 }
1090
1091 init_waitqueue_head(&seq_sleeper);
1092 init_waitqueue_head(&midi_sleeper);
1093 output_threshold = SEQ_MAX_QUEUE / 2;
1094
1095 return 0;
1096 }
1097
1098 void seq_drain_midi_queues(void)
1099 {
1100 int i, n;
1101
1102 /*
1103 * Give the Midi drivers time to drain their output queues
1104 */
1105
1106 n = 1;
1107
1108 while (!signal_pending(current) && n)
1109 {
1110 n = 0;
1111
1112 for (i = 0; i < max_mididev; i++)
1113 if (midi_opened[i] && midi_written[i])
1114 if (midi_devs[i]->buffer_status != NULL)
1115 if (midi_devs[i]->buffer_status(i))
1116 n++;
1117
1118 /*
1119 * Let's have a delay
1120 */
1121
1122 if (n)
1123 interruptible_sleep_on_timeout(&seq_sleeper,
1124 HZ/10);
1125 }
1126 }
1127
1128 void sequencer_release(int dev, struct file *file)
1129 {
1130 int i;
1131 int mode = translate_mode(file);
1132
1133 dev = dev >> 4;
1134
1135 DEB(printk("sequencer_release(dev=%d)\n", dev));
1136
1137 /*
1138 * Wait until the queue is empty (if we don't have nonblock)
1139 */
1140
1141 if (mode != OPEN_READ && !(file->f_flags & O_NONBLOCK))
1142 {
1143 while (!signal_pending(current) && qlen > 0)
1144 {
1145 seq_sync();
1146 interruptible_sleep_on_timeout(&seq_sleeper,
1147 3*HZ);
1148 /* Extra delay */
1149 }
1150 }
1151
1152 if (mode != OPEN_READ)
1153 seq_drain_midi_queues(); /*
1154 * Ensure the output queues are empty
1155 */
1156 seq_reset();
1157 if (mode != OPEN_READ)
1158 seq_drain_midi_queues(); /*
1159 * Flush the all notes off messages
1160 */
1161
1162 for (i = 0; i < max_synthdev; i++)
1163 {
1164 if (synth_open_mask & (1 << i)) /*
1165 * Actually opened
1166 */
1167 if (synth_devs[i])
1168 {
1169 synth_devs[i]->close(i);
1170
1171 if (synth_devs[i]->owner)
1172 __MOD_DEC_USE_COUNT (synth_devs[i]->owner);
1173
1174 if (synth_devs[i]->midi_dev)
1175 midi_opened[synth_devs[i]->midi_dev] = 0;
1176 }
1177 }
1178
1179 for (i = 0; i < max_mididev; i++)
1180 {
1181 if (midi_opened[i]) {
1182 midi_devs[i]->close(i);
1183 if (midi_devs[i]->owner)
1184 __MOD_DEC_USE_COUNT (midi_devs[i]->owner);
1185 }
1186 }
1187
1188 if (seq_mode == SEQ_2) {
1189 tmr->close(tmr_no);
1190 if (tmr->owner)
1191 __MOD_DEC_USE_COUNT (tmr->owner);
1192 }
1193
1194 if (obsolete_api_used)
1195 printk(KERN_WARNING "/dev/music: Obsolete (4 byte) API was used by %s\n", current->comm);
1196 sequencer_busy = 0;
1197 }
1198
1199 static int seq_sync(void)
1200 {
1201 unsigned long flags;
1202
1203 if (qlen && !seq_playing && !signal_pending(current))
1204 seq_startplay();
1205
1206 save_flags(flags);
1207 cli();
1208 if (qlen > 0)
1209 interruptible_sleep_on_timeout(&seq_sleeper, HZ);
1210 restore_flags(flags);
1211 return qlen;
1212 }
1213
1214 static void midi_outc(int dev, unsigned char data)
1215 {
1216 /*
1217 * NOTE! Calls sleep(). Don't call this from interrupt.
1218 */
1219
1220 int n;
1221 unsigned long flags;
1222
1223 /*
1224 * This routine sends one byte to the Midi channel.
1225 * If the output FIFO is full, it waits until there
1226 * is space in the queue
1227 */
1228
1229 n = 3 * HZ; /* Timeout */
1230
1231 save_flags(flags);
1232 cli();
1233 while (n && !midi_devs[dev]->outputc(dev, data)) {
1234 interruptible_sleep_on_timeout(&seq_sleeper, HZ/25);
1235 n--;
1236 }
1237 restore_flags(flags);
1238 }
1239
1240 static void seq_reset(void)
1241 {
1242 /*
1243 * NOTE! Calls sleep(). Don't call this from interrupt.
1244 */
1245
1246 int i;
1247 int chn;
1248 unsigned long flags;
1249
1250 sound_stop_timer();
1251
1252 seq_time = jiffies;
1253 prev_input_time = 0;
1254 prev_event_time = 0;
1255
1256 qlen = qhead = qtail = 0;
1257 iqlen = iqhead = iqtail = 0;
1258
1259 for (i = 0; i < max_synthdev; i++)
1260 if (synth_open_mask & (1 << i))
1261 if (synth_devs[i])
1262 synth_devs[i]->reset(i);
1263
1264 if (seq_mode == SEQ_2)
1265 {
1266 for (chn = 0; chn < 16; chn++)
1267 for (i = 0; i < max_synthdev; i++)
1268 if (synth_open_mask & (1 << i))
1269 if (synth_devs[i])
1270 {
1271 synth_devs[i]->controller(i, chn, 123, 0); /* All notes off */
1272 synth_devs[i]->controller(i, chn, 121, 0); /* Reset all ctl */
1273 synth_devs[i]->bender(i, chn, 1 << 13); /* Bender off */
1274 }
1275 }
1276 else /* seq_mode == SEQ_1 */
1277 {
1278 for (i = 0; i < max_mididev; i++)
1279 if (midi_written[i]) /*
1280 * Midi used. Some notes may still be playing
1281 */
1282 {
1283 /*
1284 * Sending just a ACTIVE SENSING message should be enough to stop all
1285 * playing notes. Since there are devices not recognizing the
1286 * active sensing, we have to send some all notes off messages also.
1287 */
1288 midi_outc(i, 0xfe);
1289
1290 for (chn = 0; chn < 16; chn++)
1291 {
1292 midi_outc(i, (unsigned char) (0xb0 + (chn & 0x0f))); /* control change */
1293 midi_outc(i, 0x7b); /* All notes off */
1294 midi_outc(i, 0); /* Dummy parameter */
1295 }
1296
1297 midi_devs[i]->close(i);
1298
1299 midi_written[i] = 0;
1300 midi_opened[i] = 0;
1301 }
1302 }
1303
1304 seq_playing = 0;
1305
1306 save_flags(flags);
1307 cli();
1308
1309 if (waitqueue_active(&seq_sleeper)) {
1310 /* printk( "Sequencer Warning: Unexpected sleeping process - Waking up\n"); */
1311 wake_up(&seq_sleeper);
1312 }
1313 restore_flags(flags);
1314 }
1315
1316 static void seq_panic(void)
1317 {
1318 /*
1319 * This routine is called by the application in case the user
1320 * wants to reset the system to the default state.
1321 */
1322
1323 seq_reset();
1324
1325 /*
1326 * Since some of the devices don't recognize the active sensing and
1327 * all notes off messages, we have to shut all notes manually.
1328 *
1329 * TO BE IMPLEMENTED LATER
1330 */
1331
1332 /*
1333 * Also return the controllers to their default states
1334 */
1335 }
1336
1337 int sequencer_ioctl(int dev, struct file *file, unsigned int cmd, caddr_t arg)
1338 {
1339 int midi_dev, orig_dev, val, err;
1340 int mode = translate_mode(file);
1341 struct synth_info inf;
1342 struct seq_event_rec event_rec;
1343 unsigned long flags;
1344
1345 orig_dev = dev = dev >> 4;
1346
1347 switch (cmd)
1348 {
1349 case SNDCTL_TMR_TIMEBASE:
1350 case SNDCTL_TMR_TEMPO:
1351 case SNDCTL_TMR_START:
1352 case SNDCTL_TMR_STOP:
1353 case SNDCTL_TMR_CONTINUE:
1354 case SNDCTL_TMR_METRONOME:
1355 case SNDCTL_TMR_SOURCE:
1356 if (seq_mode != SEQ_2)
1357 return -EINVAL;
1358 return tmr->ioctl(tmr_no, cmd, arg);
1359
1360 case SNDCTL_TMR_SELECT:
1361 if (seq_mode != SEQ_2)
1362 return -EINVAL;
1363 if (get_user(pending_timer, (int *)arg))
1364 return -EFAULT;
1365 if (pending_timer < 0 || pending_timer >= num_sound_timers || sound_timer_devs[pending_timer] == NULL)
1366 {
1367 pending_timer = -1;
1368 return -EINVAL;
1369 }
1370 val = pending_timer;
1371 break;
1372
1373 case SNDCTL_SEQ_PANIC:
1374 seq_panic();
1375 return -EINVAL;
1376
1377 case SNDCTL_SEQ_SYNC:
1378 if (mode == OPEN_READ)
1379 return 0;
1380 while (qlen > 0 && !signal_pending(current))
1381 seq_sync();
1382 return qlen ? -EINTR : 0;
1383
1384 case SNDCTL_SEQ_RESET:
1385 seq_reset();
1386 return 0;
1387
1388 case SNDCTL_SEQ_TESTMIDI:
1389 if (__get_user(midi_dev, (int *)arg))
1390 return -EFAULT;
1391 if (midi_dev < 0 || midi_dev >= max_mididev || !midi_devs[midi_dev])
1392 return -ENXIO;
1393
1394 if (!midi_opened[midi_dev] &&
1395 (err = midi_devs[midi_dev]->open(midi_dev, mode, sequencer_midi_input,
1396 sequencer_midi_output)) < 0)
1397 return err;
1398 midi_opened[midi_dev] = 1;
1399 return 0;
1400
1401 case SNDCTL_SEQ_GETINCOUNT:
1402 if (mode == OPEN_WRITE)
1403 return 0;
1404 val = iqlen;
1405 break;
1406
1407 case SNDCTL_SEQ_GETOUTCOUNT:
1408 if (mode == OPEN_READ)
1409 return 0;
1410 val = SEQ_MAX_QUEUE - qlen;
1411 break;
1412
1413 case SNDCTL_SEQ_GETTIME:
1414 if (seq_mode == SEQ_2)
1415 return tmr->ioctl(tmr_no, cmd, arg);
1416 val = jiffies - seq_time;
1417 break;
1418
1419 case SNDCTL_SEQ_CTRLRATE:
1420 /*
1421 * If *arg == 0, just return the current rate
1422 */
1423 if (seq_mode == SEQ_2)
1424 return tmr->ioctl(tmr_no, cmd, arg);
1425
1426 if (get_user(val, (int *)arg))
1427 return -EFAULT;
1428 if (val != 0)
1429 return -EINVAL;
1430 val = HZ;
1431 break;
1432
1433 case SNDCTL_SEQ_RESETSAMPLES:
1434 case SNDCTL_SYNTH_REMOVESAMPLE:
1435 case SNDCTL_SYNTH_CONTROL:
1436 if (get_user(dev, (int *)arg))
1437 return -EFAULT;
1438 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1439 return -ENXIO;
1440 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1441 return -EBUSY;
1442 return synth_devs[dev]->ioctl(dev, cmd, arg);
1443
1444 case SNDCTL_SEQ_NRSYNTHS:
1445 val = max_synthdev;
1446 break;
1447
1448 case SNDCTL_SEQ_NRMIDIS:
1449 val = max_mididev;
1450 break;
1451
1452 case SNDCTL_SYNTH_MEMAVL:
1453 if (get_user(dev, (int *)arg))
1454 return -EFAULT;
1455 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1456 return -ENXIO;
1457 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1458 return -EBUSY;
1459 val = synth_devs[dev]->ioctl(dev, cmd, arg);
1460 break;
1461
1462 case SNDCTL_FM_4OP_ENABLE:
1463 if (get_user(dev, (int *)arg))
1464 return -EFAULT;
1465 if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1466 return -ENXIO;
1467 if (!(synth_open_mask & (1 << dev)))
1468 return -ENXIO;
1469 synth_devs[dev]->ioctl(dev, cmd, arg);
1470 return 0;
1471
1472 case SNDCTL_SYNTH_INFO:
1473 if (get_user(dev, (int *)(&(((struct synth_info *)arg)->device))))
1474 return -EFAULT;
1475 if (dev < 0 || dev >= max_synthdev)
1476 return -ENXIO;
1477 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1478 return -EBUSY;
1479 return synth_devs[dev]->ioctl(dev, cmd, arg);
1480
1481 /* Like SYNTH_INFO but returns ID in the name field */
1482 case SNDCTL_SYNTH_ID:
1483 if (get_user(dev, (int *)(&(((struct synth_info *)arg)->device))))
1484 return -EFAULT;
1485 if (dev < 0 || dev >= max_synthdev)
1486 return -ENXIO;
1487 if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1488 return -EBUSY;
1489 memcpy(&inf, synth_devs[dev]->info, sizeof(inf));
1490 strncpy(inf.name, synth_devs[dev]->id, sizeof(inf.name));
1491 inf.device = dev;
1492 return copy_to_user(arg, &inf, sizeof(inf))?-EFAULT:0;
1493
1494 case SNDCTL_SEQ_OUTOFBAND:
1495 if (copy_from_user(&event_rec, arg, sizeof(event_rec)))
1496 return -EFAULT;
1497 save_flags(flags);
1498 cli();
1499 play_event(event_rec.arr);
1500 restore_flags(flags);
1501 return 0;
1502
1503 case SNDCTL_MIDI_INFO:
1504 if (get_user(dev, (int *)(&(((struct midi_info *)arg)->device))))
1505 return -EFAULT;
1506 if (dev < 0 || dev >= max_mididev || !midi_devs[dev])
1507 return -ENXIO;
1508 midi_devs[dev]->info.device = dev;
1509 return copy_to_user(arg, &midi_devs[dev]->info, sizeof(struct midi_info))?-EFAULT:0;
1510
1511 case SNDCTL_SEQ_THRESHOLD:
1512 if (get_user(val, (int *)arg))
1513 return -EFAULT;
1514 if (val < 1)
1515 val = 1;
1516 if (val >= SEQ_MAX_QUEUE)
1517 val = SEQ_MAX_QUEUE - 1;
1518 output_threshold = val;
1519 return 0;
1520
1521 case SNDCTL_MIDI_PRETIME:
1522 if (get_user(val, (int *)arg))
1523 return -EFAULT;
1524 if (val < 0)
1525 val = 0;
1526 val = (HZ * val) / 10;
1527 pre_event_timeout = val;
1528 break;
1529
1530 default:
1531 if (mode == OPEN_READ)
1532 return -EIO;
1533 if (!synth_devs[0])
1534 return -ENXIO;
1535 if (!(synth_open_mask & (1 << 0)))
1536 return -ENXIO;
1537 if (!synth_devs[0]->ioctl)
1538 return -EINVAL;
1539 return synth_devs[0]->ioctl(0, cmd, arg);
1540 }
1541 return put_user(val, (int *)arg);
1542 }
1543
1544 /* No kernel lock - we're using the global irq lock here */
1545 unsigned int sequencer_poll(int dev, struct file *file, poll_table * wait)
1546 {
1547 unsigned long flags;
1548 unsigned int mask = 0;
1549
1550 dev = dev >> 4;
1551
1552 save_flags(flags);
1553 cli();
1554 /* input */
1555 poll_wait(file, &midi_sleeper, wait);
1556 if (iqlen)
1557 mask |= POLLIN | POLLRDNORM;
1558
1559 /* output */
1560 poll_wait(file, &seq_sleeper, wait);
1561 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
1562 mask |= POLLOUT | POLLWRNORM;
1563 restore_flags(flags);
1564 return mask;
1565 }
1566
1567
1568 void sequencer_timer(unsigned long dummy)
1569 {
1570 seq_startplay();
1571 }
1572
1573 int note_to_freq(int note_num)
1574 {
1575
1576 /*
1577 * This routine converts a midi note to a frequency (multiplied by 1000)
1578 */
1579
1580 int note, octave, note_freq;
1581 static int notes[] =
1582 {
1583 261632, 277189, 293671, 311132, 329632, 349232,
1584 369998, 391998, 415306, 440000, 466162, 493880
1585 };
1586
1587 #define BASE_OCTAVE 5
1588
1589 octave = note_num / 12;
1590 note = note_num % 12;
1591
1592 note_freq = notes[note];
1593
1594 if (octave < BASE_OCTAVE)
1595 note_freq >>= (BASE_OCTAVE - octave);
1596 else if (octave > BASE_OCTAVE)
1597 note_freq <<= (octave - BASE_OCTAVE);
1598
1599 /*
1600 * note_freq >>= 1;
1601 */
1602
1603 return note_freq;
1604 }
1605
1606 unsigned long compute_finetune(unsigned long base_freq, int bend, int range,
1607 int vibrato_cents)
1608 {
1609 unsigned long amount;
1610 int negative, semitones, cents, multiplier = 1;
1611
1612 if (!bend)
1613 return base_freq;
1614 if (!range)
1615 return base_freq;
1616
1617 if (!base_freq)
1618 return base_freq;
1619
1620 if (range >= 8192)
1621 range = 8192;
1622
1623 bend = bend * range / 8192; /* Convert to cents */
1624 bend += vibrato_cents;
1625
1626 if (!bend)
1627 return base_freq;
1628
1629 negative = bend < 0 ? 1 : 0;
1630
1631 if (bend < 0)
1632 bend *= -1;
1633 if (bend > range)
1634 bend = range;
1635
1636 /*
1637 if (bend > 2399)
1638 bend = 2399;
1639 */
1640 while (bend > 2399)
1641 {
1642 multiplier *= 4;
1643 bend -= 2400;
1644 }
1645
1646 semitones = bend / 100;
1647 if (semitones > 99)
1648 semitones = 99;
1649 cents = bend % 100;
1650
1651 amount = (int) (semitone_tuning[semitones] * multiplier * cent_tuning[cents]) / 10000;
1652
1653 if (negative)
1654 return (base_freq * 10000) / amount; /* Bend down */
1655 else
1656 return (base_freq * amount) / 10000; /* Bend up */
1657 }
1658
1659
1660 void sequencer_init(void)
1661 {
1662 /* drag in sequencer_syms.o */
1663 {
1664 extern char sequencer_syms_symbol;
1665 sequencer_syms_symbol = 0;
1666 }
1667
1668 if (sequencer_ok)
1669 return;
1670 MIDIbuf_init();
1671 queue = (unsigned char *)vmalloc(SEQ_MAX_QUEUE * EV_SZ);
1672 if (queue == NULL)
1673 {
1674 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer output queue\n");
1675 return;
1676 }
1677 iqueue = (unsigned char *)vmalloc(SEQ_MAX_QUEUE * IEV_SZ);
1678 if (iqueue == NULL)
1679 {
1680 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer input queue\n");
1681 vfree(queue);
1682 return;
1683 }
1684 sequencer_ok = 1;
1685 }
1686
1687 void sequencer_unload(void)
1688 {
1689 if(queue)
1690 {
1691 vfree(queue);
1692 queue=NULL;
1693 }
1694 if(iqueue)
1695 {
1696 vfree(iqueue);
1697 iqueue=NULL;
1698 }
1699 }
1700