sound/oss/sequencer.c

   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 }