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 23static int sequencer_ok; 24static struct sound_timer_operations *tmr; 25static int tmr_no = -1; /* Currently selected timer */ 26static int pending_timer = -1; /* For timer change operation */ 27extern unsigned long seq_time; 28 29static int obsolete_api_used; 30static DEFINE_SPINLOCK(lock); 31 32/* 33 * Local counts for number of synth and MIDI devices. These are initialized 34 * by the sequencer_open. 35 */ 36static int max_mididev; 37static 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 47static int seq_mode = SEQ_1; 48 49static DECLARE_WAIT_QUEUE_HEAD(seq_sleeper); 50static DECLARE_WAIT_QUEUE_HEAD(midi_sleeper); 51 52static int midi_opened[MAX_MIDI_DEV]; 53 54static int midi_written[MAX_MIDI_DEV]; 55 56static unsigned long prev_input_time; 57static int prev_event_time; 58 59#include "tuning.h" 60 61#define EV_SZ 8 62#define IEV_SZ 8 63 64static unsigned char *queue; 65static unsigned char *iqueue; 66 67static volatile int qhead, qtail, qlen; 68static volatile int iqhead, iqtail, iqlen; 69static volatile int seq_playing; 70static volatile int sequencer_busy; 71static int output_threshold; 72static long pre_event_timeout; 73static unsigned synth_open_mask; 74 75static int seq_queue(unsigned char *note, char nonblock); 76static void seq_startplay(void); 77static int seq_sync(void); 78static void seq_reset(void); 79 80#if MAX_SYNTH_DEV > 15 81#error Too many synthesizer devices enabled. 82#endif 83 84int 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 129static void sequencer_midi_output(int dev) 130{ 131 /* 132 * Currently NOP 133 */ 134} 135 136void 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} 159EXPORT_SYMBOL(seq_copy_to_input); 160 161static 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 185void 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} 209EXPORT_SYMBOL(seq_input_event); 210 211int 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(); 325out: 326 return count; 327} 328 329static 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 362static 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 417static 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 429static 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 444static 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 526static 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 623static 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 695static 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 710static 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 733static 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 */ 870static 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 902static 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 909static 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 943int 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 1094static 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 1124void 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 1192static 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 1202static 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 1227static 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 1302static 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 1323int 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 */ 1531unsigned 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 1553void sequencer_timer(unsigned long dummy) 1554{ 1555 seq_startplay(); 1556} 1557EXPORT_SYMBOL(sequencer_timer); 1558 1559int 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} 1591EXPORT_SYMBOL(note_to_freq); 1592 1593unsigned 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 cents = bend % 100; 1635 1636 amount = (int) (semitone_tuning[semitones] * multiplier * cent_tuning[cents]) / 10000; 1637 1638 if (negative) 1639 return (base_freq * 10000) / amount; /* Bend down */ 1640 else 1641 return (base_freq * amount) / 10000; /* Bend up */ 1642} 1643EXPORT_SYMBOL(compute_finetune); 1644 1645void sequencer_init(void) 1646{ 1647 if (sequencer_ok) 1648 return; 1649 queue = (unsigned char *)vmalloc(SEQ_MAX_QUEUE * EV_SZ); 1650 if (queue == NULL) 1651 { 1652 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer output queue\n"); 1653 return; 1654 } 1655 iqueue = (unsigned char *)vmalloc(SEQ_MAX_QUEUE * IEV_SZ); 1656 if (iqueue == NULL) 1657 { 1658 printk(KERN_ERR "sequencer: Can't allocate memory for sequencer input queue\n"); 1659 vfree(queue); 1660 return; 1661 } 1662 sequencer_ok = 1; 1663} 1664EXPORT_SYMBOL(sequencer_init); 1665 1666void sequencer_unload(void) 1667{ 1668 vfree(queue); 1669 vfree(iqueue); 1670 queue = iqueue = NULL; 1671} 1672