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Linux/sound/oss/sequencer.c

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  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, 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                                 if (chn > 15)
549                                         break;
550 
551                                 synth_devs[dev]->chn_info[chn].pgm_num = p1;
552                                 if ((int) dev >= num_synths)
553                                         synth_devs[dev]->set_instr(dev, chn, p1);
554                         }
555                         else
556                                 synth_devs[dev]->set_instr(dev, chn, p1);
557 
558                         break;
559 
560                 case MIDI_CTL_CHANGE:
561                         if (seq_mode == SEQ_2)
562                         {
563                                 if (chn > 15 || p1 > 127)
564                                         break;
565 
566                                 synth_devs[dev]->chn_info[chn].controllers[p1] = w14 & 0x7f;
567 
568                                 if (p1 < 32)    /* Setting MSB should clear LSB to 0 */
569                                         synth_devs[dev]->chn_info[chn].controllers[p1 + 32] = 0;
570 
571                                 if ((int) dev < num_synths)
572                                 {
573                                         int val = w14 & 0x7f;
574                                         int i, key;
575 
576                                         if (p1 < 64)    /* Combine MSB and LSB */
577                                         {
578                                                 val = ((synth_devs[dev]->
579                                                         chn_info[chn].controllers[p1 & ~32] & 0x7f) << 7)
580                                                         | (synth_devs[dev]->
581                                                         chn_info[chn].controllers[p1 | 32] & 0x7f);
582                                                 p1 &= ~32;
583                                         }
584                                         /* Handle all playing notes on this channel */
585 
586                                         key = ((int) chn << 8);
587 
588                                         for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
589                                                 if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
590                                                         synth_devs[dev]->controller(dev, i, p1, val);
591                                 }
592                                 else
593                                         synth_devs[dev]->controller(dev, chn, p1, w14);
594                         }
595                         else    /* Mode 1 */
596                                 synth_devs[dev]->controller(dev, chn, p1, w14);
597                         break;
598 
599                 case MIDI_PITCH_BEND:
600                         if (seq_mode == SEQ_2)
601                         {
602                                 if (chn > 15)
603                                         break;
604 
605                                 synth_devs[dev]->chn_info[chn].bender_value = w14;
606 
607                                 if ((int) dev < num_synths)
608                                 {
609                                         /* Handle all playing notes on this channel */
610                                         int i, key;
611 
612                                         key = (chn << 8);
613 
614                                         for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
615                                                 if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
616                                                         synth_devs[dev]->bender(dev, i, w14);
617                                 }
618                                 else
619                                         synth_devs[dev]->bender(dev, chn, w14);
620                         }
621                         else    /* MODE 1 */
622                                 synth_devs[dev]->bender(dev, chn, w14);
623                         break;
624 
625                 default:;
626         }
627 }
628 
629 static int seq_timing_event(unsigned char *event_rec)
630 {
631         unsigned char cmd = event_rec[1];
632         unsigned int parm = *(int *) &event_rec[4];
633 
634         if (seq_mode == SEQ_2)
635         {
636                 int ret;
637 
638                 if ((ret = tmr->event(tmr_no, event_rec)) == TIMER_ARMED)
639                         if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
640                                 wake_up(&seq_sleeper);
641                 return ret;
642         }
643         switch (cmd)
644         {
645                 case TMR_WAIT_REL:
646                         parm += prev_event_time;
647 
648                         /*
649                          * NOTE!  No break here. Execution of TMR_WAIT_REL continues in the
650                          * next case (TMR_WAIT_ABS)
651                          */
652 
653                 case TMR_WAIT_ABS:
654                         if (parm > 0)
655                         {
656                                 long time;
657 
658                                 time = parm;
659                                 prev_event_time = time;
660 
661                                 seq_playing = 1;
662                                 request_sound_timer(time);
663 
664                                 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
665                                         wake_up(&seq_sleeper);
666                                 return TIMER_ARMED;
667                         }
668                         break;
669 
670                 case TMR_START:
671                         seq_time = jiffies;
672                         prev_input_time = 0;
673                         prev_event_time = 0;
674                         break;
675 
676                 case TMR_STOP:
677                         break;
678 
679                 case TMR_CONTINUE:
680                         break;
681 
682                 case TMR_TEMPO:
683                         break;
684 
685                 case TMR_ECHO:
686                         if (seq_mode == SEQ_2)
687                                 seq_copy_to_input(event_rec, 8);
688                         else
689                         {
690                                 parm = (parm << 8 | SEQ_ECHO);
691                                 seq_copy_to_input((unsigned char *) &parm, 4);
692                         }
693                         break;
694 
695                 default:;
696         }
697 
698         return TIMER_NOT_ARMED;
699 }
700 
701 static void seq_local_event(unsigned char *event_rec)
702 {
703         unsigned char   cmd = event_rec[1];
704         unsigned int    parm = *((unsigned int *) &event_rec[4]);
705 
706         switch (cmd)
707         {
708                 case LOCL_STARTAUDIO:
709                         DMAbuf_start_devices(parm);
710                         break;
711 
712                 default:;
713         }
714 }
715 
716 static void seq_sysex_message(unsigned char *event_rec)
717 {
718         unsigned int dev = event_rec[1];
719         int i, l = 0;
720         unsigned char  *buf = &event_rec[2];
721 
722         if (dev > max_synthdev)
723                 return;
724         if (!(synth_open_mask & (1 << dev)))
725                 return;
726         if (!synth_devs[dev])
727                 return;
728 
729         l = 0;
730         for (i = 0; i < 6 && buf[i] != 0xff; i++)
731                 l = i + 1;
732 
733         if (!synth_devs[dev]->send_sysex)
734                 return;
735         if (l > 0)
736                 synth_devs[dev]->send_sysex(dev, buf, l);
737 }
738 
739 static int play_event(unsigned char *q)
740 {
741         /*
742          * NOTE! This routine returns
743          *   0 = normal event played.
744          *   1 = Timer armed. Suspend playback until timer callback.
745          *   2 = MIDI output buffer full. Restore queue and suspend until timer
746          */
747         unsigned int *delay;
748 
749         switch (q[0])
750         {
751                 case SEQ_NOTEOFF:
752                         if (synth_open_mask & (1 << 0))
753                                 if (synth_devs[0])
754                                         synth_devs[0]->kill_note(0, q[1], 255, q[3]);
755                         break;
756 
757                 case SEQ_NOTEON:
758                         if (q[4] < 128 || q[4] == 255)
759                                 if (synth_open_mask & (1 << 0))
760                                         if (synth_devs[0])
761                                                 synth_devs[0]->start_note(0, q[1], q[2], q[3]);
762                         break;
763 
764                 case SEQ_WAIT:
765                         delay = (unsigned int *) q;     /*
766                                                          * Bytes 1 to 3 are containing the *
767                                                          * delay in 'ticks'
768                                                          */
769                         *delay = (*delay >> 8) & 0xffffff;
770 
771                         if (*delay > 0)
772                         {
773                                 long time;
774 
775                                 seq_playing = 1;
776                                 time = *delay;
777                                 prev_event_time = time;
778 
779                                 request_sound_timer(time);
780 
781                                 if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
782                                         wake_up(&seq_sleeper);
783                                 /*
784                                  * The timer is now active and will reinvoke this function
785                                  * after the timer expires. Return to the caller now.
786                                  */
787                                 return 1;
788                         }
789                         break;
790 
791                 case SEQ_PGMCHANGE:
792                         if (synth_open_mask & (1 << 0))
793                                 if (synth_devs[0])
794                                         synth_devs[0]->set_instr(0, q[1], q[2]);
795                         break;
796 
797                 case SEQ_SYNCTIMER:     /*
798                                          * Reset timer
799                                          */
800                         seq_time = jiffies;
801                         prev_input_time = 0;
802                         prev_event_time = 0;
803                         break;
804 
805                 case SEQ_MIDIPUTC:      /*
806                                          * Put a midi character
807                                          */
808                         if (midi_opened[q[2]])
809                         {
810                                 int dev;
811 
812                                 dev = q[2];
813 
814                                 if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
815                                         break;
816 
817                                 if (!midi_devs[dev]->outputc(dev, q[1]))
818                                 {
819                                         /*
820                                          * Output FIFO is full. Wait one timer cycle and try again.
821                                          */
822 
823                                         seq_playing = 1;
824                                         request_sound_timer(-1);
825                                         return 2;
826                                 }
827                                 else
828                                         midi_written[dev] = 1;
829                         }
830                         break;
831 
832                 case SEQ_ECHO:
833                         seq_copy_to_input(q, 4);        /*
834                                                          * Echo back to the process
835                                                          */
836                         break;
837 
838                 case SEQ_PRIVATE:
839                         if ((int) q[1] < max_synthdev)
840                                 synth_devs[q[1]]->hw_control(q[1], q);
841                         break;
842 
843                 case SEQ_EXTENDED:
844                         extended_event(q);
845                         break;
846 
847                 case EV_CHN_VOICE:
848                         seq_chn_voice_event(q);
849                         break;
850 
851                 case EV_CHN_COMMON:
852                         seq_chn_common_event(q);
853                         break;
854 
855                 case EV_TIMING:
856                         if (seq_timing_event(q) == TIMER_ARMED)
857                         {
858                                 return 1;
859                         }
860                         break;
861 
862                 case EV_SEQ_LOCAL:
863                         seq_local_event(q);
864                         break;
865 
866                 case EV_SYSEX:
867                         seq_sysex_message(q);
868                         break;
869 
870                 default:;
871         }
872         return 0;
873 }
874 
875 /* called also as timer in irq context */
876 static void seq_startplay(void)
877 {
878         int this_one, action;
879         unsigned long flags;
880 
881         while (qlen > 0)
882         {
883 
884                 spin_lock_irqsave(&lock,flags);
885                 qhead = ((this_one = qhead) + 1) % SEQ_MAX_QUEUE;
886                 qlen--;
887                 spin_unlock_irqrestore(&lock,flags);
888 
889                 seq_playing = 1;
890 
891                 if ((action = play_event(&queue[this_one * EV_SZ])))
892                 {               /* Suspend playback. Next timer routine invokes this routine again */
893                         if (action == 2)
894                         {
895                                 qlen++;
896                                 qhead = this_one;
897                         }
898                         return;
899                 }
900         }
901 
902         seq_playing = 0;
903 
904         if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
905                 wake_up(&seq_sleeper);
906 }
907 
908 static void reset_controllers(int dev, unsigned char *controller, int update_dev)
909 {
910         int i;
911         for (i = 0; i < 128; i++)
912                 controller[i] = ctrl_def_values[i];
913 }
914 
915 static void setup_mode2(void)
916 {
917         int dev;
918 
919         max_synthdev = num_synths;
920 
921         for (dev = 0; dev < num_midis; dev++)
922         {
923                 if (midi_devs[dev] && midi_devs[dev]->converter != NULL)
924                 {
925                         synth_devs[max_synthdev++] = midi_devs[dev]->converter;
926                 }
927         }
928 
929         for (dev = 0; dev < max_synthdev; dev++)
930         {
931                 int chn;
932 
933                 synth_devs[dev]->sysex_ptr = 0;
934                 synth_devs[dev]->emulation = 0;
935 
936                 for (chn = 0; chn < 16; chn++)
937                 {
938                         synth_devs[dev]->chn_info[chn].pgm_num = 0;
939                         reset_controllers(dev,
940                                 synth_devs[dev]->chn_info[chn].controllers,0);
941                         synth_devs[dev]->chn_info[chn].bender_value = (1 << 7); /* Neutral */
942                         synth_devs[dev]->chn_info[chn].bender_range = 200;
943                 }
944         }
945         max_mididev = 0;
946         seq_mode = SEQ_2;
947 }
948 
949 int sequencer_open(int dev, struct file *file)
950 {
951         int retval, mode, i;
952         int level, tmp;
953 
954         if (!sequencer_ok)
955                 sequencer_init();
956 
957         level = ((dev & 0x0f) == SND_DEV_SEQ2) ? 2 : 1;
958 
959         dev = dev >> 4;
960         mode = translate_mode(file);
961 
962         DEB(printk("sequencer_open(dev=%d)\n", dev));
963 
964         if (!sequencer_ok)
965         {
966 /*              printk("Sound card: sequencer not initialized\n");*/
967                 return -ENXIO;
968         }
969         if (dev)                /* Patch manager device (obsolete) */
970                 return -ENXIO;
971 
972         if(synth_devs[dev] == NULL)
973                 request_module("synth0");
974 
975         if (mode == OPEN_READ)
976         {
977                 if (!num_midis)
978                 {
979                         /*printk("Sequencer: No MIDI devices. Input not possible\n");*/
980                         sequencer_busy = 0;
981                         return -ENXIO;
982                 }
983         }
984         if (sequencer_busy)
985         {
986                 return -EBUSY;
987         }
988         sequencer_busy = 1;
989         obsolete_api_used = 0;
990 
991         max_mididev = num_midis;
992         max_synthdev = num_synths;
993         pre_event_timeout = MAX_SCHEDULE_TIMEOUT;
994         seq_mode = SEQ_1;
995 
996         if (pending_timer != -1)
997         {
998                 tmr_no = pending_timer;
999                 pending_timer = -1;
1000         }
1001         if (tmr_no == -1)       /* Not selected yet */
1002         {
1003                 int i, best;
1004 
1005                 best = -1;
1006                 for (i = 0; i < num_sound_timers; i++)
1007                         if (sound_timer_devs[i] && sound_timer_devs[i]->priority > best)
1008                         {
1009                                 tmr_no = i;
1010                                 best = sound_timer_devs[i]->priority;
1011                         }
1012                 if (tmr_no == -1)       /* Should not be */
1013                         tmr_no = 0;
1014         }
1015         tmr = sound_timer_devs[tmr_no];
1016 
1017         if (level == 2)
1018         {
1019                 if (tmr == NULL)
1020                 {
1021                         /*printk("sequencer: No timer for level 2\n");*/
1022                         sequencer_busy = 0;
1023                         return -ENXIO;
1024                 }
1025                 setup_mode2();
1026         }
1027         if (!max_synthdev && !max_mididev)
1028         {
1029                 sequencer_busy=0;
1030                 return -ENXIO;
1031         }
1032 
1033         synth_open_mask = 0;
1034 
1035         for (i = 0; i < max_mididev; i++)
1036         {
1037                 midi_opened[i] = 0;
1038                 midi_written[i] = 0;
1039         }
1040 
1041         for (i = 0; i < max_synthdev; i++)
1042         {
1043                 if (synth_devs[i]==NULL)
1044                         continue;
1045 
1046                 if (!try_module_get(synth_devs[i]->owner))
1047                         continue;
1048 
1049                 if ((tmp = synth_devs[i]->open(i, mode)) < 0)
1050                 {
1051                         printk(KERN_WARNING "Sequencer: Warning! Cannot open synth device #%d (%d)\n", i, tmp);
1052                         if (synth_devs[i]->midi_dev)
1053                                 printk(KERN_WARNING "(Maps to MIDI dev #%d)\n", synth_devs[i]->midi_dev);
1054                 }
1055                 else
1056                 {
1057                         synth_open_mask |= (1 << i);
1058                         if (synth_devs[i]->midi_dev)
1059                                 midi_opened[synth_devs[i]->midi_dev] = 1;
1060                 }
1061         }
1062 
1063         seq_time = jiffies;
1064 
1065         prev_input_time = 0;
1066         prev_event_time = 0;
1067 
1068         if (seq_mode == SEQ_1 && (mode == OPEN_READ || mode == OPEN_READWRITE))
1069         {
1070                 /*
1071                  * Initialize midi input devices
1072                  */
1073 
1074                 for (i = 0; i < max_mididev; i++)
1075                         if (!midi_opened[i] && midi_devs[i])
1076                         {
1077                                 if (!try_module_get(midi_devs[i]->owner))
1078                                         continue;
1079         
1080                                 if ((retval = midi_devs[i]->open(i, mode,
1081                                         sequencer_midi_input, sequencer_midi_output)) >= 0)
1082                                 {
1083                                         midi_opened[i] = 1;
1084                                 }
1085                         }
1086         }
1087 
1088         if (seq_mode == SEQ_2) {
1089                 if (try_module_get(tmr->owner))
1090                         tmr->open(tmr_no, seq_mode);
1091         }
1092 
1093         init_waitqueue_head(&seq_sleeper);
1094         init_waitqueue_head(&midi_sleeper);
1095         output_threshold = SEQ_MAX_QUEUE / 2;
1096 
1097         return 0;
1098 }
1099 
1100 static void seq_drain_midi_queues(void)
1101 {
1102         int i, n;
1103 
1104         /*
1105          * Give the Midi drivers time to drain their output queues
1106          */
1107 
1108         n = 1;
1109 
1110         while (!signal_pending(current) && n)
1111         {
1112                 n = 0;
1113 
1114                 for (i = 0; i < max_mididev; i++)
1115                         if (midi_opened[i] && midi_written[i])
1116                                 if (midi_devs[i]->buffer_status != NULL)
1117                                         if (midi_devs[i]->buffer_status(i))
1118                                                 n++;
1119 
1120                 /*
1121                  * Let's have a delay
1122                  */
1123 
1124                 if (n)
1125                         interruptible_sleep_on_timeout(&seq_sleeper,
1126                                                        HZ/10);
1127         }
1128 }
1129 
1130 void sequencer_release(int dev, struct file *file)
1131 {
1132         int i;
1133         int mode = translate_mode(file);
1134 
1135         dev = dev >> 4;
1136 
1137         DEB(printk("sequencer_release(dev=%d)\n", dev));
1138 
1139         /*
1140          * Wait until the queue is empty (if we don't have nonblock)
1141          */
1142 
1143         if (mode != OPEN_READ && !(file->f_flags & O_NONBLOCK))
1144         {
1145                 while (!signal_pending(current) && qlen > 0)
1146                 {
1147                         seq_sync();
1148                         interruptible_sleep_on_timeout(&seq_sleeper,
1149                                                        3*HZ);
1150                         /* Extra delay */
1151                 }
1152         }
1153 
1154         if (mode != OPEN_READ)
1155                 seq_drain_midi_queues();        /*
1156                                                  * Ensure the output queues are empty
1157                                                  */
1158         seq_reset();
1159         if (mode != OPEN_READ)
1160                 seq_drain_midi_queues();        /*
1161                                                  * Flush the all notes off messages
1162                                                  */
1163 
1164         for (i = 0; i < max_synthdev; i++)
1165         {
1166                 if (synth_open_mask & (1 << i)) /*
1167                                                  * Actually opened
1168                                                  */
1169                         if (synth_devs[i])
1170                         {
1171                                 synth_devs[i]->close(i);
1172 
1173                                 module_put(synth_devs[i]->owner);
1174 
1175                                 if (synth_devs[i]->midi_dev)
1176                                         midi_opened[synth_devs[i]->midi_dev] = 0;
1177                         }
1178         }
1179 
1180         for (i = 0; i < max_mididev; i++)
1181         {
1182                 if (midi_opened[i]) {
1183                         midi_devs[i]->close(i);
1184                         module_put(midi_devs[i]->owner);
1185                 }
1186         }
1187 
1188         if (seq_mode == SEQ_2) {
1189                 tmr->close(tmr_no);
1190                 module_put(tmr->owner);
1191         }
1192 
1193         if (obsolete_api_used)
1194                 printk(KERN_WARNING "/dev/music: Obsolete (4 byte) API was used by %s\n", current->comm);
1195         sequencer_busy = 0;
1196 }
1197 
1198 static int seq_sync(void)
1199 {
1200         if (qlen && !seq_playing && !signal_pending(current))
1201                 seq_startplay();
1202 
1203         if (qlen > 0)
1204                 interruptible_sleep_on_timeout(&seq_sleeper, HZ);
1205         return qlen;
1206 }
1207 
1208 static void midi_outc(int dev, unsigned char data)
1209 {
1210         /*
1211          * NOTE! Calls sleep(). Don't call this from interrupt.
1212          */
1213 
1214         int n;
1215         unsigned long flags;
1216 
1217         /*
1218          * This routine sends one byte to the Midi channel.
1219          * If the output FIFO is full, it waits until there
1220          * is space in the queue
1221          */
1222 
1223         n = 3 * HZ;             /* Timeout */
1224 
1225         spin_lock_irqsave(&lock,flags);
1226         while (n && !midi_devs[dev]->outputc(dev, data)) {
1227                 interruptible_sleep_on_timeout(&seq_sleeper, HZ/25);
1228                 n--;
1229         }
1230         spin_unlock_irqrestore(&lock,flags);
1231 }
1232 
1233 static void seq_reset(void)
1234 {
1235         /*
1236          * NOTE! Calls sleep(). Don't call this from interrupt.
1237          */
1238 
1239         int i;
1240         int chn;
1241         unsigned long flags;
1242 
1243         sound_stop_timer();
1244 
1245         seq_time = jiffies;
1246         prev_input_time = 0;
1247         prev_event_time = 0;
1248 
1249         qlen = qhead = qtail = 0;
1250         iqlen = iqhead = iqtail = 0;
1251 
1252         for (i = 0; i < max_synthdev; i++)
1253                 if (synth_open_mask & (1 << i))
1254                         if (synth_devs[i])
1255                                 synth_devs[i]->reset(i);
1256 
1257         if (seq_mode == SEQ_2)
1258         {
1259                 for (chn = 0; chn < 16; chn++)
1260                         for (i = 0; i < max_synthdev; i++)
1261                                 if (synth_open_mask & (1 << i))
1262                                         if (synth_devs[i])
1263                                         {
1264                                                 synth_devs[i]->controller(i, chn, 123, 0);      /* All notes off */
1265                                                 synth_devs[i]->controller(i, chn, 121, 0);      /* Reset all ctl */
1266                                                 synth_devs[i]->bender(i, chn, 1 << 13); /* Bender off */
1267                                         }
1268         }
1269         else    /* seq_mode == SEQ_1 */
1270         {
1271                 for (i = 0; i < max_mididev; i++)
1272                         if (midi_written[i])    /*
1273                                                  * Midi used. Some notes may still be playing
1274                                                  */
1275                         {
1276                                 /*
1277                                  *      Sending just a ACTIVE SENSING message should be enough to stop all
1278                                  *      playing notes. Since there are devices not recognizing the
1279                                  *      active sensing, we have to send some all notes off messages also.
1280                                  */
1281                                 midi_outc(i, 0xfe);
1282 
1283                                 for (chn = 0; chn < 16; chn++)
1284                                 {
1285                                         midi_outc(i, (unsigned char) (0xb0 + (chn & 0x0f)));            /* control change */
1286                                         midi_outc(i, 0x7b);     /* All notes off */
1287                                         midi_outc(i, 0);        /* Dummy parameter */
1288                                 }
1289 
1290                                 midi_devs[i]->close(i);
1291 
1292                                 midi_written[i] = 0;
1293                                 midi_opened[i] = 0;
1294                         }
1295         }
1296 
1297         seq_playing = 0;
1298 
1299         spin_lock_irqsave(&lock,flags);
1300 
1301         if (waitqueue_active(&seq_sleeper)) {
1302                 /*      printk( "Sequencer Warning: Unexpected sleeping process - Waking up\n"); */
1303                 wake_up(&seq_sleeper);
1304         }
1305         spin_unlock_irqrestore(&lock,flags);
1306 }
1307 
1308 static void seq_panic(void)
1309 {
1310         /*
1311          * This routine is called by the application in case the user
1312          * wants to reset the system to the default state.
1313          */
1314 
1315         seq_reset();
1316 
1317         /*
1318          * Since some of the devices don't recognize the active sensing and
1319          * all notes off messages, we have to shut all notes manually.
1320          *
1321          *      TO BE IMPLEMENTED LATER
1322          */
1323 
1324         /*
1325          * Also return the controllers to their default states
1326          */
1327 }
1328 
1329 int sequencer_ioctl(int dev, struct file *file, unsigned int cmd, void __user *arg)
1330 {
1331         int midi_dev, orig_dev, val, err;
1332         int mode = translate_mode(file);
1333         struct synth_info inf;
1334         struct seq_event_rec event_rec;
1335         unsigned long flags;
1336         int __user *p = arg;
1337 
1338         orig_dev = dev = dev >> 4;
1339 
1340         switch (cmd)
1341         {
1342                 case SNDCTL_TMR_TIMEBASE:
1343                 case SNDCTL_TMR_TEMPO:
1344                 case SNDCTL_TMR_START:
1345                 case SNDCTL_TMR_STOP:
1346                 case SNDCTL_TMR_CONTINUE:
1347                 case SNDCTL_TMR_METRONOME:
1348                 case SNDCTL_TMR_SOURCE:
1349                         if (seq_mode != SEQ_2)
1350                                 return -EINVAL;
1351                         return tmr->ioctl(tmr_no, cmd, arg);
1352 
1353                 case SNDCTL_TMR_SELECT:
1354                         if (seq_mode != SEQ_2)
1355                                 return -EINVAL;
1356                         if (get_user(pending_timer, p))
1357                                 return -EFAULT;
1358                         if (pending_timer < 0 || pending_timer >= num_sound_timers || sound_timer_devs[pending_timer] == NULL)
1359                         {
1360                                 pending_timer = -1;
1361                                 return -EINVAL;
1362                         }
1363                         val = pending_timer;
1364                         break;
1365 
1366                 case SNDCTL_SEQ_PANIC:
1367                         seq_panic();
1368                         return -EINVAL;
1369 
1370                 case SNDCTL_SEQ_SYNC:
1371                         if (mode == OPEN_READ)
1372                                 return 0;
1373                         while (qlen > 0 && !signal_pending(current))
1374                                 seq_sync();
1375                         return qlen ? -EINTR : 0;
1376 
1377                 case SNDCTL_SEQ_RESET:
1378                         seq_reset();
1379                         return 0;
1380 
1381                 case SNDCTL_SEQ_TESTMIDI:
1382                         if (__get_user(midi_dev, p))
1383                                 return -EFAULT;
1384                         if (midi_dev < 0 || midi_dev >= max_mididev || !midi_devs[midi_dev])
1385                                 return -ENXIO;
1386 
1387                         if (!midi_opened[midi_dev] &&
1388                                 (err = midi_devs[midi_dev]->open(midi_dev, mode, sequencer_midi_input,
1389                                                      sequencer_midi_output)) < 0)
1390                                 return err;
1391                         midi_opened[midi_dev] = 1;
1392                         return 0;
1393 
1394                 case SNDCTL_SEQ_GETINCOUNT:
1395                         if (mode == OPEN_WRITE)
1396                                 return 0;
1397                         val = iqlen;
1398                         break;
1399 
1400                 case SNDCTL_SEQ_GETOUTCOUNT:
1401                         if (mode == OPEN_READ)
1402                                 return 0;
1403                         val = SEQ_MAX_QUEUE - qlen;
1404                         break;
1405 
1406                 case SNDCTL_SEQ_GETTIME:
1407                         if (seq_mode == SEQ_2)
1408                                 return tmr->ioctl(tmr_no, cmd, arg);
1409                         val = jiffies - seq_time;
1410                         break;
1411 
1412                 case SNDCTL_SEQ_CTRLRATE:
1413                         /*
1414                          * If *arg == 0, just return the current rate
1415                          */
1416                         if (seq_mode == SEQ_2)
1417                                 return tmr->ioctl(tmr_no, cmd, arg);
1418 
1419                         if (get_user(val, p))
1420                                 return -EFAULT;
1421                         if (val != 0)
1422                                 return -EINVAL;
1423                         val = HZ;
1424                         break;
1425 
1426                 case SNDCTL_SEQ_RESETSAMPLES:
1427                 case SNDCTL_SYNTH_REMOVESAMPLE:
1428                 case SNDCTL_SYNTH_CONTROL:
1429                         if (get_user(dev, p))
1430                                 return -EFAULT;
1431                         if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1432                                 return -ENXIO;
1433                         if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1434                                 return -EBUSY;
1435                         return synth_devs[dev]->ioctl(dev, cmd, arg);
1436 
1437                 case SNDCTL_SEQ_NRSYNTHS:
1438                         val = max_synthdev;
1439                         break;
1440 
1441                 case SNDCTL_SEQ_NRMIDIS:
1442                         val = max_mididev;
1443                         break;
1444 
1445                 case SNDCTL_SYNTH_MEMAVL:
1446                         if (get_user(dev, p))
1447                                 return -EFAULT;
1448                         if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1449                                 return -ENXIO;
1450                         if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1451                                 return -EBUSY;
1452                         val = synth_devs[dev]->ioctl(dev, cmd, arg);
1453                         break;
1454 
1455                 case SNDCTL_FM_4OP_ENABLE:
1456                         if (get_user(dev, p))
1457                                 return -EFAULT;
1458                         if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
1459                                 return -ENXIO;
1460                         if (!(synth_open_mask & (1 << dev)))
1461                                 return -ENXIO;
1462                         synth_devs[dev]->ioctl(dev, cmd, arg);
1463                         return 0;
1464 
1465                 case SNDCTL_SYNTH_INFO:
1466                         if (get_user(dev, &((struct synth_info __user *)arg)->device))
1467                                 return -EFAULT;
1468                         if (dev < 0 || dev >= max_synthdev)
1469                                 return -ENXIO;
1470                         if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1471                                 return -EBUSY;
1472                         return synth_devs[dev]->ioctl(dev, cmd, arg);
1473 
1474                 /* Like SYNTH_INFO but returns ID in the name field */
1475                 case SNDCTL_SYNTH_ID:
1476                         if (get_user(dev, &((struct synth_info __user *)arg)->device))
1477                                 return -EFAULT;
1478                         if (dev < 0 || dev >= max_synthdev)
1479                                 return -ENXIO;
1480                         if (!(synth_open_mask & (1 << dev)) && !orig_dev)
1481                                 return -EBUSY;
1482                         memcpy(&inf, synth_devs[dev]->info, sizeof(inf));
1483                         strlcpy(inf.name, synth_devs[dev]->id, sizeof(inf.name));
1484                         inf.device = dev;
1485                         return copy_to_user(arg, &inf, sizeof(inf))?-EFAULT:0;
1486 
1487                 case SNDCTL_SEQ_OUTOFBAND:
1488                         if (copy_from_user(&event_rec, arg, sizeof(event_rec)))
1489                                 return -EFAULT;
1490                         spin_lock_irqsave(&lock,flags);
1491                         play_event(event_rec.arr);
1492                         spin_unlock_irqrestore(&lock,flags);
1493                         return 0;
1494 
1495                 case SNDCTL_MIDI_INFO:
1496                         if (get_user(dev, &((struct midi_info __user *)arg)->device))
1497                                 return -EFAULT;
1498                         if (dev < 0 || dev >= max_mididev || !midi_devs[dev])
1499                                 return -ENXIO;
1500                         midi_devs[dev]->info.device = dev;
1501                         return copy_to_user(arg, &midi_devs[dev]->info, sizeof(struct midi_info))?-EFAULT:0;
1502 
1503                 case SNDCTL_SEQ_THRESHOLD:
1504                         if (get_user(val, p))
1505                                 return -EFAULT;
1506                         if (val < 1)
1507                                 val = 1;
1508                         if (val >= SEQ_MAX_QUEUE)
1509                                 val = SEQ_MAX_QUEUE - 1;
1510                         output_threshold = val;
1511                         return 0;
1512 
1513                 case SNDCTL_MIDI_PRETIME:
1514                         if (get_user(val, p))
1515                                 return -EFAULT;
1516                         if (val < 0)
1517                                 val = 0;
1518                         val = (HZ * val) / 10;
1519                         pre_event_timeout = val;
1520                         break;
1521 
1522                 default:
1523                         if (mode == OPEN_READ)
1524                                 return -EIO;
1525                         if (!synth_devs[0])
1526                                 return -ENXIO;
1527                         if (!(synth_open_mask & (1 << 0)))
1528                                 return -ENXIO;
1529                         if (!synth_devs[0]->ioctl)
1530                                 return -EINVAL;
1531                         return synth_devs[0]->ioctl(0, cmd, arg);
1532         }
1533         return put_user(val, p);
1534 }
1535 
1536 /* No kernel lock - we're using the global irq lock here */
1537 unsigned int sequencer_poll(int dev, struct file *file, poll_table * wait)
1538 {
1539         unsigned long flags;
1540         unsigned int mask = 0;
1541 
1542         dev = dev >> 4;
1543 
1544         spin_lock_irqsave(&lock,flags);
1545         /* input */
1546         poll_wait(file, &midi_sleeper, wait);
1547         if (iqlen)
1548                 mask |= POLLIN | POLLRDNORM;
1549 
1550         /* output */
1551         poll_wait(file, &seq_sleeper, wait);
1552         if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
1553                 mask |= POLLOUT | POLLWRNORM;
1554         spin_unlock_irqrestore(&lock,flags);
1555         return mask;
1556 }
1557 
1558 
1559 void sequencer_timer(unsigned long dummy)
1560 {
1561         seq_startplay();
1562 }
1563 EXPORT_SYMBOL(sequencer_timer);
1564 
1565 int note_to_freq(int note_num)
1566 {
1567 
1568         /*
1569          * This routine converts a midi note to a frequency (multiplied by 1000)
1570          */
1571 
1572         int note, octave, note_freq;
1573         static int notes[] =
1574         {
1575                 261632, 277189, 293671, 311132, 329632, 349232,
1576                 369998, 391998, 415306, 440000, 466162, 493880
1577         };
1578 
1579 #define BASE_OCTAVE     5
1580 
1581         octave = note_num / 12;
1582         note = note_num % 12;
1583 
1584         note_freq = notes[note];
1585 
1586         if (octave < BASE_OCTAVE)
1587                 note_freq >>= (BASE_OCTAVE - octave);
1588         else if (octave > BASE_OCTAVE)
1589                 note_freq <<= (octave - BASE_OCTAVE);
1590 
1591         /*
1592          * note_freq >>= 1;
1593          */
1594 
1595         return note_freq;
1596 }
1597 EXPORT_SYMBOL(note_to_freq);
1598 
1599 unsigned long compute_finetune(unsigned long base_freq, int bend, int range,
1600                  int vibrato_cents)
1601 {
1602         unsigned long amount;
1603         int negative, semitones, cents, multiplier = 1;
1604 
1605         if (!bend)
1606                 return base_freq;
1607         if (!range)
1608                 return base_freq;
1609 
1610         if (!base_freq)
1611                 return base_freq;
1612 
1613         if (range >= 8192)
1614                 range = 8192;
1615 
1616         bend = bend * range / 8192;     /* Convert to cents */
1617         bend += vibrato_cents;
1618 
1619         if (!bend)
1620                 return base_freq;
1621 
1622         negative = bend < 0 ? 1 : 0;
1623 
1624         if (bend < 0)
1625                 bend *= -1;
1626         if (bend > range)
1627                 bend = range;
1628 
1629         /*
1630            if (bend > 2399)
1631            bend = 2399;
1632          */
1633         while (bend > 2399)
1634         {
1635                 multiplier *= 4;
1636                 bend -= 2400;
1637         }
1638 
1639         semitones = bend / 100;
1640         cents = bend % 100;
1641 
1642         amount = (int) (semitone_tuning[semitones] * multiplier * cent_tuning[cents]) / 10000;
1643 
1644         if (negative)
1645                 return (base_freq * 10000) / amount;    /* Bend down */
1646         else
1647                 return (base_freq * amount) / 10000;    /* Bend up */
1648 }
1649 EXPORT_SYMBOL(compute_finetune);
1650 
1651 void sequencer_init(void)
1652 {
1653         if (sequencer_ok)
1654                 return;
1655         queue = vmalloc(SEQ_MAX_QUEUE * EV_SZ);
1656         if (queue == NULL)
1657         {
1658                 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer output queue\n");
1659                 return;
1660         }
1661         iqueue = vmalloc(SEQ_MAX_QUEUE * IEV_SZ);
1662         if (iqueue == NULL)
1663         {
1664                 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer input queue\n");
1665                 vfree(queue);
1666                 return;
1667         }
1668         sequencer_ok = 1;
1669 }
1670 EXPORT_SYMBOL(sequencer_init);
1671 
1672 void sequencer_unload(void)
1673 {
1674         vfree(queue);
1675         vfree(iqueue);
1676         queue = iqueue = NULL;
1677 }
1678 

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