sound/oss/midi_synth.c

   1 /*
   2  * sound/midi_synth.c
   3  *
   4  * High level midi sequencer manager for dumb MIDI interfaces.
   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  * Andrew Veliath  : fixed running status in MIDI input state machine
  16  */
  17 #define USE_SEQ_MACROS
  18 #define USE_SIMPLE_MACROS
  19
  20 #include "sound_config.h"
  21
  22 #define _MIDI_SYNTH_C_
  23
  24 #include "midi_synth.h"
  25
  26 static int      midi2synth[MAX_MIDI_DEV];
  27 static int      sysex_state[MAX_MIDI_DEV] =
  28 {0};
  29 static unsigned char prev_out_status[MAX_MIDI_DEV];
  30
  31 #define STORE(cmd) \
  32 { \
  33   int len; \
  34   unsigned char obuf[8]; \
  35   cmd; \
  36   seq_input_event(obuf, len); \
  37 }
  38
  39 #define _seqbuf obuf
  40 #define _seqbufptr 0
  41 #define _SEQ_ADVBUF(x) len=x
  42
  43 void
  44 do_midi_msg(int synthno, unsigned char *msg, int mlen)
  45 {
  46         switch (msg[0] & 0xf0)
  47           {
  48           case 0x90:
  49                   if (msg[2] != 0)
  50                     {
  51                             STORE(SEQ_START_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
  52                             break;
  53                     }
  54                   msg[2] = 64;
  55
  56           case 0x80:
  57                   STORE(SEQ_STOP_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
  58                   break;
  59
  60           case 0xA0:
  61                   STORE(SEQ_KEY_PRESSURE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
  62                   break;
  63
  64           case 0xB0:
  65                   STORE(SEQ_CONTROL(synthno, msg[0] & 0x0f,
  66                                     msg[1], msg[2]));
  67                   break;
  68
  69           case 0xC0:
  70                   STORE(SEQ_SET_PATCH(synthno, msg[0] & 0x0f, msg[1]));
  71                   break;
  72
  73           case 0xD0:
  74                   STORE(SEQ_CHN_PRESSURE(synthno, msg[0] & 0x0f, msg[1]));
  75                   break;
  76
  77           case 0xE0:
  78                   STORE(SEQ_BENDER(synthno, msg[0] & 0x0f,
  79                               (msg[1] & 0x7f) | ((msg[2] & 0x7f) << 7)));
  80                   break;
  81
  82           default:
  83                   /* printk( "MPU: Unknown midi channel message %02x\n",  msg[0]); */
  84                   ;
  85           }
  86 }
  87
  88 static void
  89 midi_outc(int midi_dev, int data)
  90 {
  91         int             timeout;
  92
  93         for (timeout = 0; timeout < 3200; timeout++)
  94                 if (midi_devs[midi_dev]->outputc(midi_dev, (unsigned char) (data & 0xff)))
  95                   {
  96                           if (data & 0x80)      /*
  97                                                  * Status byte
  98                                                  */
  99                                   prev_out_status[midi_dev] =
 100                                       (unsigned char) (data & 0xff);    /*
 101                                                                          * Store for running status
 102                                                                          */
 103                           return;       /*
 104                                          * Mission complete
 105                                          */
 106                   }
 107         /*
 108          * Sorry! No space on buffers.
 109          */
 110         printk("Midi send timed out\n");
 111 }
 112
 113 static int
 114 prefix_cmd(int midi_dev, unsigned char status)
 115 {
 116         if ((char *) midi_devs[midi_dev]->prefix_cmd == NULL)
 117                 return 1;
 118
 119         return midi_devs[midi_dev]->prefix_cmd(midi_dev, status);
 120 }
 121
 122 static void
 123 midi_synth_input(int orig_dev, unsigned char data)
 124 {
 125         int             dev;
 126         struct midi_input_info *inc;
 127
 128         static unsigned char len_tab[] =        /* # of data bytes following a status
 129                                                  */
 130         {
 131                 2,              /* 8x */
 132                 2,              /* 9x */
 133                 2,              /* Ax */
 134                 2,              /* Bx */
 135                 1,              /* Cx */
 136                 1,              /* Dx */
 137                 2,              /* Ex */
 138                 0               /* Fx */
 139         };
 140
 141         if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
 142                 return;
 143
 144         if (data == 0xfe)       /* Ignore active sensing */
 145                 return;
 146
 147         dev = midi2synth[orig_dev];
 148         inc = &midi_devs[orig_dev]->in_info;
 149
 150         switch (inc->m_state)
 151           {
 152           case MST_INIT:
 153                   if (data & 0x80)      /* MIDI status byte */
 154                     {
 155                             if ((data & 0xf0) == 0xf0)  /* Common message */
 156                               {
 157                                       switch (data)
 158                                         {
 159                                         case 0xf0:      /* Sysex */
 160                                                 inc->m_state = MST_SYSEX;
 161                                                 break;  /* Sysex */
 162
 163                                         case 0xf1:      /* MTC quarter frame */
 164                                         case 0xf3:      /* Song select */
 165                                                 inc->m_state = MST_DATA;
 166                                                 inc->m_ptr = 1;
 167                                                 inc->m_left = 1;
 168                                                 inc->m_buf[0] = data;
 169                                                 break;
 170
 171                                         case 0xf2:      /* Song position pointer */
 172                                                 inc->m_state = MST_DATA;
 173                                                 inc->m_ptr = 1;
 174                                                 inc->m_left = 2;
 175                                                 inc->m_buf[0] = data;
 176                                                 break;
 177
 178                                         default:
 179                                                 inc->m_buf[0] = data;
 180                                                 inc->m_ptr = 1;
 181                                                 do_midi_msg(dev, inc->m_buf, inc->m_ptr);
 182                                                 inc->m_ptr = 0;
 183                                                 inc->m_left = 0;
 184                                         }
 185                             } else
 186                               {
 187                                       inc->m_state = MST_DATA;
 188                                       inc->m_ptr = 1;
 189                                       inc->m_left = len_tab[(data >> 4) - 8];
 190                                       inc->m_buf[0] = inc->m_prev_status = data;
 191                               }
 192                     } else if (inc->m_prev_status & 0x80) {
 193                             /* Data byte (use running status) */
 194                             inc->m_ptr = 2;
 195                             inc->m_buf[1] = data;
 196                             inc->m_buf[0] = inc->m_prev_status;
 197                             inc->m_left = len_tab[(inc->m_buf[0] >> 4) - 8] - 1;
 198                             if (inc->m_left > 0)
 199                                     inc->m_state = MST_DATA; /* Not done yet */
 200                             else {
 201                                     inc->m_state = MST_INIT;
 202                                     do_midi_msg(dev, inc->m_buf, inc->m_ptr);
 203                                     inc->m_ptr = 0;
 204                             }
 205                     }
 206                   break;        /* MST_INIT */
 207
 208           case MST_DATA:
 209                   inc->m_buf[inc->m_ptr++] = data;
 210                   if (--inc->m_left <= 0)
 211                     {
 212                             inc->m_state = MST_INIT;
 213                             do_midi_msg(dev, inc->m_buf, inc->m_ptr);
 214                             inc->m_ptr = 0;
 215                     }
 216                   break;        /* MST_DATA */
 217
 218           case MST_SYSEX:
 219                   if (data == 0xf7)     /* Sysex end */
 220                     {
 221                             inc->m_state = MST_INIT;
 222                             inc->m_left = 0;
 223                             inc->m_ptr = 0;
 224                     }
 225                   break;        /* MST_SYSEX */
 226
 227           default:
 228                   printk("MIDI%d: Unexpected state %d (%02x)\n", orig_dev, inc->m_state, (int) data);
 229                   inc->m_state = MST_INIT;
 230           }
 231 }
 232
 233 static void
 234 leave_sysex(int dev)
 235 {
 236         int             orig_dev = synth_devs[dev]->midi_dev;
 237         int             timeout = 0;
 238
 239         if (!sysex_state[dev])
 240                 return;
 241
 242         sysex_state[dev] = 0;
 243
 244         while (!midi_devs[orig_dev]->outputc(orig_dev, 0xf7) &&
 245                timeout < 1000)
 246                 timeout++;
 247
 248         sysex_state[dev] = 0;
 249 }
 250
 251 static void
 252 midi_synth_output(int dev)
 253 {
 254         /*
 255          * Currently NOP
 256          */
 257 }
 258
 259 int midi_synth_ioctl(int dev, unsigned int cmd, void __user *arg)
 260 {
 261         /*
 262          * int orig_dev = synth_devs[dev]->midi_dev;
 263          */
 264
 265         switch (cmd) {
 266
 267         case SNDCTL_SYNTH_INFO:
 268                 if (__copy_to_user(arg, synth_devs[dev]->info, sizeof(struct synth_info)))
 269                         return -EFAULT;
 270                 return 0;
 271
 272         case SNDCTL_SYNTH_MEMAVL:
 273                 return 0x7fffffff;
 274
 275         default:
 276                 return -EINVAL;
 277         }
 278 }
 279
 280 int
 281 midi_synth_kill_note(int dev, int channel, int note, int velocity)
 282 {
 283         int             orig_dev = synth_devs[dev]->midi_dev;
 284         int             msg, chn;
 285
 286         if (note < 0 || note > 127)
 287                 return 0;
 288         if (channel < 0 || channel > 15)
 289                 return 0;
 290         if (velocity < 0)
 291                 velocity = 0;
 292         if (velocity > 127)
 293                 velocity = 127;
 294
 295         leave_sysex(dev);
 296
 297         msg = prev_out_status[orig_dev] & 0xf0;
 298         chn = prev_out_status[orig_dev] & 0x0f;
 299
 300         if (chn == channel && ((msg == 0x90 && velocity == 64) || msg == 0x80))
 301           {                     /*
 302                                  * Use running status
 303                                  */
 304                   if (!prefix_cmd(orig_dev, note))
 305                           return 0;
 306
 307                   midi_outc(orig_dev, note);
 308
 309                   if (msg == 0x90)      /*
 310                                          * Running status = Note on
 311                                          */
 312                           midi_outc(orig_dev, 0);       /*
 313                                                            * Note on with velocity 0 == note
 314                                                            * off
 315                                                          */
 316                   else
 317                           midi_outc(orig_dev, velocity);
 318         } else
 319           {
 320                   if (velocity == 64)
 321                     {
 322                             if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
 323                                     return 0;
 324                             midi_outc(orig_dev, 0x90 | (channel & 0x0f));       /*
 325                                                                                  * Note on
 326                                                                                  */
 327                             midi_outc(orig_dev, note);
 328                             midi_outc(orig_dev, 0);     /*
 329                                                          * Zero G
 330                                                          */
 331                   } else
 332                     {
 333                             if (!prefix_cmd(orig_dev, 0x80 | (channel & 0x0f)))
 334                                     return 0;
 335                             midi_outc(orig_dev, 0x80 | (channel & 0x0f));       /*
 336                                                                                  * Note off
 337                                                                                  */
 338                             midi_outc(orig_dev, note);
 339                             midi_outc(orig_dev, velocity);
 340                     }
 341           }
 342
 343         return 0;
 344 }
 345
 346 int
 347 midi_synth_set_instr(int dev, int channel, int instr_no)
 348 {
 349         int             orig_dev = synth_devs[dev]->midi_dev;
 350
 351         if (instr_no < 0 || instr_no > 127)
 352                 instr_no = 0;
 353         if (channel < 0 || channel > 15)
 354                 return 0;
 355
 356         leave_sysex(dev);
 357
 358         if (!prefix_cmd(orig_dev, 0xc0 | (channel & 0x0f)))
 359                 return 0;
 360         midi_outc(orig_dev, 0xc0 | (channel & 0x0f));   /*
 361                                                          * Program change
 362                                                          */
 363         midi_outc(orig_dev, instr_no);
 364
 365         return 0;
 366 }
 367
 368 int
 369 midi_synth_start_note(int dev, int channel, int note, int velocity)
 370 {
 371         int             orig_dev = synth_devs[dev]->midi_dev;
 372         int             msg, chn;
 373
 374         if (note < 0 || note > 127)
 375                 return 0;
 376         if (channel < 0 || channel > 15)
 377                 return 0;
 378         if (velocity < 0)
 379                 velocity = 0;
 380         if (velocity > 127)
 381                 velocity = 127;
 382
 383         leave_sysex(dev);
 384
 385         msg = prev_out_status[orig_dev] & 0xf0;
 386         chn = prev_out_status[orig_dev] & 0x0f;
 387
 388         if (chn == channel && msg == 0x90)
 389           {                     /*
 390                                  * Use running status
 391                                  */
 392                   if (!prefix_cmd(orig_dev, note))
 393                           return 0;
 394                   midi_outc(orig_dev, note);
 395                   midi_outc(orig_dev, velocity);
 396         } else
 397           {
 398                   if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
 399                           return 0;
 400                   midi_outc(orig_dev, 0x90 | (channel & 0x0f));         /*
 401                                                                          * Note on
 402                                                                          */
 403                   midi_outc(orig_dev, note);
 404                   midi_outc(orig_dev, velocity);
 405           }
 406         return 0;
 407 }
 408
 409 void
 410 midi_synth_reset(int dev)
 411 {
 412
 413         leave_sysex(dev);
 414 }
 415
 416 int
 417 midi_synth_open(int dev, int mode)
 418 {
 419         int             orig_dev = synth_devs[dev]->midi_dev;
 420         int             err;
 421         struct midi_input_info *inc;
 422
 423         if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
 424                 return -ENXIO;
 425
 426         midi2synth[orig_dev] = dev;
 427         sysex_state[dev] = 0;
 428         prev_out_status[orig_dev] = 0;
 429
 430         if ((err = midi_devs[orig_dev]->open(orig_dev, mode,
 431                                midi_synth_input, midi_synth_output)) < 0)
 432                 return err;
 433         inc = &midi_devs[orig_dev]->in_info;
 434
 435         /* save_flags(flags);
 436         cli();
 437         don't know against what irqhandler to protect*/
 438         inc->m_busy = 0;
 439         inc->m_state = MST_INIT;
 440         inc->m_ptr = 0;
 441         inc->m_left = 0;
 442         inc->m_prev_status = 0x00;
 443         /* restore_flags(flags); */
 444
 445         return 1;
 446 }
 447
 448 void
 449 midi_synth_close(int dev)
 450 {
 451         int             orig_dev = synth_devs[dev]->midi_dev;
 452
 453         leave_sysex(dev);
 454
 455         /*
 456          * Shut up the synths by sending just single active sensing message.
 457          */
 458         midi_devs[orig_dev]->outputc(orig_dev, 0xfe);
 459
 460         midi_devs[orig_dev]->close(orig_dev);
 461 }
 462
 463 void
 464 midi_synth_hw_control(int dev, unsigned char *event)
 465 {
 466 }
 467
 468 int
 469 midi_synth_load_patch(int dev, int format, const char __user *addr,
 470                       int offs, int count, int pmgr_flag)
 471 {
 472         int             orig_dev = synth_devs[dev]->midi_dev;
 473
 474         struct sysex_info sysex;
 475         int             i;
 476         unsigned long   left, src_offs, eox_seen = 0;
 477         int             first_byte = 1;
 478         int             hdr_size = (unsigned long) &sysex.data[0] - (unsigned long) &sysex;
 479
 480         leave_sysex(dev);
 481
 482         if (!prefix_cmd(orig_dev, 0xf0))
 483                 return 0;
 484
 485         if (format != SYSEX_PATCH)
 486         {
 487 /*                printk("MIDI Error: Invalid patch format (key) 0x%x\n", format);*/
 488                   return -EINVAL;
 489         }
 490         if (count < hdr_size)
 491         {
 492 /*              printk("MIDI Error: Patch header too short\n");*/
 493                 return -EINVAL;
 494         }
 495         count -= hdr_size;
 496
 497         /*
 498          * Copy the header from user space but ignore the first bytes which have
 499          * been transferred already.
 500          */
 501
 502         if(copy_from_user(&((char *) &sysex)[offs], &(addr)[offs], hdr_size - offs))
 503                 return -EFAULT;
 504
 505         if (count < sysex.len)
 506         {
 507 /*              printk(KERN_WARNING "MIDI Warning: Sysex record too short (%d<%d)\n", count, (int) sysex.len);*/
 508                 sysex.len = count;
 509         }
 510         left = sysex.len;
 511         src_offs = 0;
 512
 513         for (i = 0; i < left && !signal_pending(current); i++)
 514         {
 515                 unsigned char   data;
 516
 517                 get_user(*(unsigned char *) &data, (unsigned char __user *) &((addr)[hdr_size + i]));
 518
 519                 eox_seen = (i > 0 && data & 0x80);      /* End of sysex */
 520
 521                 if (eox_seen && data != 0xf7)
 522                         data = 0xf7;
 523
 524                 if (i == 0)
 525                 {
 526                         if (data != 0xf0)
 527                         {
 528                                 printk(KERN_WARNING "midi_synth: Sysex start missing\n");
 529                                 return -EINVAL;
 530                         }
 531                 }
 532                 while (!midi_devs[orig_dev]->outputc(orig_dev, (unsigned char) (data & 0xff)) &&
 533                         !signal_pending(current))
 534                         schedule();
 535
 536                 if (!first_byte && data & 0x80)
 537                         return 0;
 538                 first_byte = 0;
 539         }
 540
 541         if (!eox_seen)
 542                 midi_outc(orig_dev, 0xf7);
 543         return 0;
 544 }
 545
 546 void midi_synth_panning(int dev, int channel, int pressure)
 547 {
 548 }
 549
 550 void midi_synth_aftertouch(int dev, int channel, int pressure)
 551 {
 552         int             orig_dev = synth_devs[dev]->midi_dev;
 553         int             msg, chn;
 554
 555         if (pressure < 0 || pressure > 127)
 556                 return;
 557         if (channel < 0 || channel > 15)
 558                 return;
 559
 560         leave_sysex(dev);
 561
 562         msg = prev_out_status[orig_dev] & 0xf0;
 563         chn = prev_out_status[orig_dev] & 0x0f;
 564
 565         if (msg != 0xd0 || chn != channel)      /*
 566                                                  * Test for running status
 567                                                  */
 568           {
 569                   if (!prefix_cmd(orig_dev, 0xd0 | (channel & 0x0f)))
 570                           return;
 571                   midi_outc(orig_dev, 0xd0 | (channel & 0x0f));         /*
 572                                                                          * Channel pressure
 573                                                                          */
 574         } else if (!prefix_cmd(orig_dev, pressure))
 575                 return;
 576
 577         midi_outc(orig_dev, pressure);
 578 }
 579
 580 void
 581 midi_synth_controller(int dev, int channel, int ctrl_num, int value)
 582 {
 583         int             orig_dev = synth_devs[dev]->midi_dev;
 584         int             chn, msg;
 585
 586         if (ctrl_num < 0 || ctrl_num > 127)
 587                 return;
 588         if (channel < 0 || channel > 15)
 589                 return;
 590
 591         leave_sysex(dev);
 592
 593         msg = prev_out_status[orig_dev] & 0xf0;
 594         chn = prev_out_status[orig_dev] & 0x0f;
 595
 596         if (msg != 0xb0 || chn != channel)
 597           {
 598                   if (!prefix_cmd(orig_dev, 0xb0 | (channel & 0x0f)))
 599                           return;
 600                   midi_outc(orig_dev, 0xb0 | (channel & 0x0f));
 601         } else if (!prefix_cmd(orig_dev, ctrl_num))
 602                 return;
 603
 604         midi_outc(orig_dev, ctrl_num);
 605         midi_outc(orig_dev, value & 0x7f);
 606 }
 607
 608 void
 609 midi_synth_bender(int dev, int channel, int value)
 610 {
 611         int             orig_dev = synth_devs[dev]->midi_dev;
 612         int             msg, prev_chn;
 613
 614         if (channel < 0 || channel > 15)
 615                 return;
 616
 617         if (value < 0 || value > 16383)
 618                 return;
 619
 620         leave_sysex(dev);
 621
 622         msg = prev_out_status[orig_dev] & 0xf0;
 623         prev_chn = prev_out_status[orig_dev] & 0x0f;
 624
 625         if (msg != 0xd0 || prev_chn != channel)         /*
 626                                                          * Test for running status
 627                                                          */
 628           {
 629                   if (!prefix_cmd(orig_dev, 0xe0 | (channel & 0x0f)))
 630                           return;
 631                   midi_outc(orig_dev, 0xe0 | (channel & 0x0f));
 632         } else if (!prefix_cmd(orig_dev, value & 0x7f))
 633                 return;
 634
 635         midi_outc(orig_dev, value & 0x7f);
 636         midi_outc(orig_dev, (value >> 7) & 0x7f);
 637 }
 638
 639 void
 640 midi_synth_setup_voice(int dev, int voice, int channel)
 641 {
 642 }
 643
 644 int
 645 midi_synth_send_sysex(int dev, unsigned char *bytes, int len)
 646 {
 647         int             orig_dev = synth_devs[dev]->midi_dev;
 648         int             i;
 649
 650         for (i = 0; i < len; i++)
 651           {
 652                   switch (bytes[i])
 653                     {
 654                     case 0xf0:  /* Start sysex */
 655                             if (!prefix_cmd(orig_dev, 0xf0))
 656                                     return 0;
 657                             sysex_state[dev] = 1;
 658                             break;
 659
 660                     case 0xf7:  /* End sysex */
 661                             if (!sysex_state[dev])      /* Orphan sysex end */
 662                                     return 0;
 663                             sysex_state[dev] = 0;
 664                             break;
 665
 666                     default:
 667                             if (!sysex_state[dev])
 668                                     return 0;
 669
 670                             if (bytes[i] & 0x80)        /* Error. Another message before sysex end */
 671                               {
 672                                       bytes[i] = 0xf7;  /* Sysex end */
 673                                       sysex_state[dev] = 0;
 674                               }
 675                     }
 676
 677                   if (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]))
 678                     {
 679 /*
 680  * Hardware level buffer is full. Abort the sysex message.
 681  */
 682
 683                             int             timeout = 0;
 684
 685                             bytes[i] = 0xf7;
 686                             sysex_state[dev] = 0;
 687
 688                             while (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]) &&
 689                                    timeout < 1000)
 690                                     timeout++;
 691                     }
 692                   if (!sysex_state[dev])
 693                           return 0;
 694           }
 695
 696         return 0;
 697 }