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