sound/core/seq/seq_queue.c

   1 /*
   2  *   ALSA sequencer Timing queue handling
   3  *   Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program; if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  *
  19  * MAJOR CHANGES
  20  *   Nov. 13, 1999      Takashi Iwai <iwai@ww.uni-erlangen.de>
  21  *     - Queues are allocated dynamically via ioctl.
  22  *     - When owner client is deleted, all owned queues are deleted, too.
  23  *     - Owner of unlocked queue is kept unmodified even if it is
  24  *       manipulated by other clients.
  25  *     - Owner field in SET_QUEUE_OWNER ioctl must be identical with the
  26  *       caller client.  i.e. Changing owner to a third client is not
  27  *       allowed.
  28  *
  29  *  Aug. 30, 2000       Takashi Iwai
  30  *     - Queues are managed in static array again, but with better way.
  31  *       The API itself is identical.
  32  *     - The queue is locked when struct snd_seq_queue pointer is returned via
  33  *       queueptr().  This pointer *MUST* be released afterward by
  34  *       queuefree(ptr).
  35  *     - Addition of experimental sync support.
  36  */
  37
  38 #include <linux/init.h>
  39 #include <linux/slab.h>
  40 #include <sound/core.h>
  41
  42 #include "seq_memory.h"
  43 #include "seq_queue.h"
  44 #include "seq_clientmgr.h"
  45 #include "seq_fifo.h"
  46 #include "seq_timer.h"
  47 #include "seq_info.h"
  48
  49 /* list of allocated queues */
  50 static struct snd_seq_queue *queue_list[SNDRV_SEQ_MAX_QUEUES];
  51 static DEFINE_SPINLOCK(queue_list_lock);
  52 /* number of queues allocated */
  53 static int num_queues;
  54
  55 int snd_seq_queue_get_cur_queues(void)
  56 {
  57         return num_queues;
  58 }
  59
  60 /*----------------------------------------------------------------*/
  61
  62 /* assign queue id and insert to list */
  63 static int queue_list_add(struct snd_seq_queue *q)
  64 {
  65         int i;
  66         unsigned long flags;
  67
  68         spin_lock_irqsave(&queue_list_lock, flags);
  69         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
  70                 if (! queue_list[i]) {
  71                         queue_list[i] = q;
  72                         q->queue = i;
  73                         num_queues++;
  74                         spin_unlock_irqrestore(&queue_list_lock, flags);
  75                         return i;
  76                 }
  77         }
  78         spin_unlock_irqrestore(&queue_list_lock, flags);
  79         return -1;
  80 }
  81
  82 static struct snd_seq_queue *queue_list_remove(int id, int client)
  83 {
  84         struct snd_seq_queue *q;
  85         unsigned long flags;
  86
  87         spin_lock_irqsave(&queue_list_lock, flags);
  88         q = queue_list[id];
  89         if (q) {
  90                 spin_lock(&q->owner_lock);
  91                 if (q->owner == client) {
  92                         /* found */
  93                         q->klocked = 1;
  94                         spin_unlock(&q->owner_lock);
  95                         queue_list[id] = NULL;
  96                         num_queues--;
  97                         spin_unlock_irqrestore(&queue_list_lock, flags);
  98                         return q;
  99                 }
 100                 spin_unlock(&q->owner_lock);
 101         }
 102         spin_unlock_irqrestore(&queue_list_lock, flags);
 103         return NULL;
 104 }
 105
 106 /*----------------------------------------------------------------*/
 107
 108 /* create new queue (constructor) */
 109 static struct snd_seq_queue *queue_new(int owner, int locked)
 110 {
 111         struct snd_seq_queue *q;
 112
 113         q = kzalloc(sizeof(*q), GFP_KERNEL);
 114         if (q == NULL) {
 115                 snd_printd("malloc failed for snd_seq_queue_new()\n");
 116                 return NULL;
 117         }
 118
 119         spin_lock_init(&q->owner_lock);
 120         spin_lock_init(&q->check_lock);
 121         mutex_init(&q->timer_mutex);
 122         snd_use_lock_init(&q->use_lock);
 123         q->queue = -1;
 124
 125         q->tickq = snd_seq_prioq_new();
 126         q->timeq = snd_seq_prioq_new();
 127         q->timer = snd_seq_timer_new();
 128         if (q->tickq == NULL || q->timeq == NULL || q->timer == NULL) {
 129                 snd_seq_prioq_delete(&q->tickq);
 130                 snd_seq_prioq_delete(&q->timeq);
 131                 snd_seq_timer_delete(&q->timer);
 132                 kfree(q);
 133                 return NULL;
 134         }
 135
 136         q->owner = owner;
 137         q->locked = locked;
 138         q->klocked = 0;
 139
 140         return q;
 141 }
 142
 143 /* delete queue (destructor) */
 144 static void queue_delete(struct snd_seq_queue *q)
 145 {
 146         /* stop and release the timer */
 147         snd_seq_timer_stop(q->timer);
 148         snd_seq_timer_close(q);
 149         /* wait until access free */
 150         snd_use_lock_sync(&q->use_lock);
 151         /* release resources... */
 152         snd_seq_prioq_delete(&q->tickq);
 153         snd_seq_prioq_delete(&q->timeq);
 154         snd_seq_timer_delete(&q->timer);
 155
 156         kfree(q);
 157 }
 158
 159
 160 /*----------------------------------------------------------------*/
 161
 162 /* setup queues */
 163 int __init snd_seq_queues_init(void)
 164 {
 165         /*
 166         memset(queue_list, 0, sizeof(queue_list));
 167         num_queues = 0;
 168         */
 169         return 0;
 170 }
 171
 172 /* delete all existing queues */
 173 void __exit snd_seq_queues_delete(void)
 174 {
 175         int i;
 176
 177         /* clear list */
 178         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
 179                 if (queue_list[i])
 180                         queue_delete(queue_list[i]);
 181         }
 182 }
 183
 184 /* allocate a new queue -
 185  * return queue index value or negative value for error
 186  */
 187 int snd_seq_queue_alloc(int client, int locked, unsigned int info_flags)
 188 {
 189         struct snd_seq_queue *q;
 190
 191         q = queue_new(client, locked);
 192         if (q == NULL)
 193                 return -ENOMEM;
 194         q->info_flags = info_flags;
 195         if (queue_list_add(q) < 0) {
 196                 queue_delete(q);
 197                 return -ENOMEM;
 198         }
 199         snd_seq_queue_use(q->queue, client, 1); /* use this queue */
 200         return q->queue;
 201 }
 202
 203 /* delete a queue - queue must be owned by the client */
 204 int snd_seq_queue_delete(int client, int queueid)
 205 {
 206         struct snd_seq_queue *q;
 207
 208         if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
 209                 return -EINVAL;
 210         q = queue_list_remove(queueid, client);
 211         if (q == NULL)
 212                 return -EINVAL;
 213         queue_delete(q);
 214
 215         return 0;
 216 }
 217
 218
 219 /* return pointer to queue structure for specified id */
 220 struct snd_seq_queue *queueptr(int queueid)
 221 {
 222         struct snd_seq_queue *q;
 223         unsigned long flags;
 224
 225         if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
 226                 return NULL;
 227         spin_lock_irqsave(&queue_list_lock, flags);
 228         q = queue_list[queueid];
 229         if (q)
 230                 snd_use_lock_use(&q->use_lock);
 231         spin_unlock_irqrestore(&queue_list_lock, flags);
 232         return q;
 233 }
 234
 235 /* return the (first) queue matching with the specified name */
 236 struct snd_seq_queue *snd_seq_queue_find_name(char *name)
 237 {
 238         int i;
 239         struct snd_seq_queue *q;
 240
 241         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
 242                 if ((q = queueptr(i)) != NULL) {
 243                         if (strncmp(q->name, name, sizeof(q->name)) == 0)
 244                                 return q;
 245                         queuefree(q);
 246                 }
 247         }
 248         return NULL;
 249 }
 250
 251
 252 /* -------------------------------------------------------- */
 253
 254 void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop)
 255 {
 256         unsigned long flags;
 257         struct snd_seq_event_cell *cell;
 258
 259         if (q == NULL)
 260                 return;
 261
 262         /* make this function non-reentrant */
 263         spin_lock_irqsave(&q->check_lock, flags);
 264         if (q->check_blocked) {
 265                 q->check_again = 1;
 266                 spin_unlock_irqrestore(&q->check_lock, flags);
 267                 return;         /* other thread is already checking queues */
 268         }
 269         q->check_blocked = 1;
 270         spin_unlock_irqrestore(&q->check_lock, flags);
 271
 272       __again:
 273         /* Process tick queue... */
 274         while ((cell = snd_seq_prioq_cell_peek(q->tickq)) != NULL) {
 275                 if (snd_seq_compare_tick_time(&q->timer->tick.cur_tick,
 276                                               &cell->event.time.tick)) {
 277                         cell = snd_seq_prioq_cell_out(q->tickq);
 278                         if (cell)
 279                                 snd_seq_dispatch_event(cell, atomic, hop);
 280                 } else {
 281                         /* event remains in the queue */
 282                         break;
 283                 }
 284         }
 285
 286
 287         /* Process time queue... */
 288         while ((cell = snd_seq_prioq_cell_peek(q->timeq)) != NULL) {
 289                 if (snd_seq_compare_real_time(&q->timer->cur_time,
 290                                               &cell->event.time.time)) {
 291                         cell = snd_seq_prioq_cell_out(q->timeq);
 292                         if (cell)
 293                                 snd_seq_dispatch_event(cell, atomic, hop);
 294                 } else {
 295                         /* event remains in the queue */
 296                         break;
 297                 }
 298         }
 299
 300         /* free lock */
 301         spin_lock_irqsave(&q->check_lock, flags);
 302         if (q->check_again) {
 303                 q->check_again = 0;
 304                 spin_unlock_irqrestore(&q->check_lock, flags);
 305                 goto __again;
 306         }
 307         q->check_blocked = 0;
 308         spin_unlock_irqrestore(&q->check_lock, flags);
 309 }
 310
 311
 312 /* enqueue a event to singe queue */
 313 int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop)
 314 {
 315         int dest, err;
 316         struct snd_seq_queue *q;
 317
 318         if (snd_BUG_ON(!cell))
 319                 return -EINVAL;
 320         dest = cell->event.queue;       /* destination queue */
 321         q = queueptr(dest);
 322         if (q == NULL)
 323                 return -EINVAL;
 324         /* handle relative time stamps, convert them into absolute */
 325         if ((cell->event.flags & SNDRV_SEQ_TIME_MODE_MASK) == SNDRV_SEQ_TIME_MODE_REL) {
 326                 switch (cell->event.flags & SNDRV_SEQ_TIME_STAMP_MASK) {
 327                 case SNDRV_SEQ_TIME_STAMP_TICK:
 328                         cell->event.time.tick += q->timer->tick.cur_tick;
 329                         break;
 330
 331                 case SNDRV_SEQ_TIME_STAMP_REAL:
 332                         snd_seq_inc_real_time(&cell->event.time.time,
 333                                               &q->timer->cur_time);
 334                         break;
 335                 }
 336                 cell->event.flags &= ~SNDRV_SEQ_TIME_MODE_MASK;
 337                 cell->event.flags |= SNDRV_SEQ_TIME_MODE_ABS;
 338         }
 339         /* enqueue event in the real-time or midi queue */
 340         switch (cell->event.flags & SNDRV_SEQ_TIME_STAMP_MASK) {
 341         case SNDRV_SEQ_TIME_STAMP_TICK:
 342                 err = snd_seq_prioq_cell_in(q->tickq, cell);
 343                 break;
 344
 345         case SNDRV_SEQ_TIME_STAMP_REAL:
 346         default:
 347                 err = snd_seq_prioq_cell_in(q->timeq, cell);
 348                 break;
 349         }
 350
 351         if (err < 0) {
 352                 queuefree(q); /* unlock */
 353                 return err;
 354         }
 355
 356         /* trigger dispatching */
 357         snd_seq_check_queue(q, atomic, hop);
 358
 359         queuefree(q); /* unlock */
 360
 361         return 0;
 362 }
 363
 364
 365 /*----------------------------------------------------------------*/
 366
 367 static inline int check_access(struct snd_seq_queue *q, int client)
 368 {
 369         return (q->owner == client) || (!q->locked && !q->klocked);
 370 }
 371
 372 /* check if the client has permission to modify queue parameters.
 373  * if it does, lock the queue
 374  */
 375 static int queue_access_lock(struct snd_seq_queue *q, int client)
 376 {
 377         unsigned long flags;
 378         int access_ok;
 379
 380         spin_lock_irqsave(&q->owner_lock, flags);
 381         access_ok = check_access(q, client);
 382         if (access_ok)
 383                 q->klocked = 1;
 384         spin_unlock_irqrestore(&q->owner_lock, flags);
 385         return access_ok;
 386 }
 387
 388 /* unlock the queue */
 389 static inline void queue_access_unlock(struct snd_seq_queue *q)
 390 {
 391         unsigned long flags;
 392
 393         spin_lock_irqsave(&q->owner_lock, flags);
 394         q->klocked = 0;
 395         spin_unlock_irqrestore(&q->owner_lock, flags);
 396 }
 397
 398 /* exported - only checking permission */
 399 int snd_seq_queue_check_access(int queueid, int client)
 400 {
 401         struct snd_seq_queue *q = queueptr(queueid);
 402         int access_ok;
 403         unsigned long flags;
 404
 405         if (! q)
 406                 return 0;
 407         spin_lock_irqsave(&q->owner_lock, flags);
 408         access_ok = check_access(q, client);
 409         spin_unlock_irqrestore(&q->owner_lock, flags);
 410         queuefree(q);
 411         return access_ok;
 412 }
 413
 414 /*----------------------------------------------------------------*/
 415
 416 /*
 417  * change queue's owner and permission
 418  */
 419 int snd_seq_queue_set_owner(int queueid, int client, int locked)
 420 {
 421         struct snd_seq_queue *q = queueptr(queueid);
 422
 423         if (q == NULL)
 424                 return -EINVAL;
 425
 426         if (! queue_access_lock(q, client)) {
 427                 queuefree(q);
 428                 return -EPERM;
 429         }
 430
 431         q->locked = locked ? 1 : 0;
 432         q->owner = client;
 433         queue_access_unlock(q);
 434         queuefree(q);
 435
 436         return 0;
 437 }
 438
 439
 440 /*----------------------------------------------------------------*/
 441
 442 /* open timer -
 443  * q->use mutex should be down before calling this function to avoid
 444  * confliction with snd_seq_queue_use()
 445  */
 446 int snd_seq_queue_timer_open(int queueid)
 447 {
 448         int result = 0;
 449         struct snd_seq_queue *queue;
 450         struct snd_seq_timer *tmr;
 451
 452         queue = queueptr(queueid);
 453         if (queue == NULL)
 454                 return -EINVAL;
 455         tmr = queue->timer;
 456         if ((result = snd_seq_timer_open(queue)) < 0) {
 457                 snd_seq_timer_defaults(tmr);
 458                 result = snd_seq_timer_open(queue);
 459         }
 460         queuefree(queue);
 461         return result;
 462 }
 463
 464 /* close timer -
 465  * q->use mutex should be down before calling this function
 466  */
 467 int snd_seq_queue_timer_close(int queueid)
 468 {
 469         struct snd_seq_queue *queue;
 470         struct snd_seq_timer *tmr;
 471         int result = 0;
 472
 473         queue = queueptr(queueid);
 474         if (queue == NULL)
 475                 return -EINVAL;
 476         tmr = queue->timer;
 477         snd_seq_timer_close(queue);
 478         queuefree(queue);
 479         return result;
 480 }
 481
 482 /* change queue tempo and ppq */
 483 int snd_seq_queue_timer_set_tempo(int queueid, int client,
 484                                   struct snd_seq_queue_tempo *info)
 485 {
 486         struct snd_seq_queue *q = queueptr(queueid);
 487         int result;
 488
 489         if (q == NULL)
 490                 return -EINVAL;
 491         if (! queue_access_lock(q, client)) {
 492                 queuefree(q);
 493                 return -EPERM;
 494         }
 495
 496         result = snd_seq_timer_set_tempo(q->timer, info->tempo);
 497         if (result >= 0)
 498                 result = snd_seq_timer_set_ppq(q->timer, info->ppq);
 499         if (result >= 0 && info->skew_base > 0)
 500                 result = snd_seq_timer_set_skew(q->timer, info->skew_value,
 501                                                 info->skew_base);
 502         queue_access_unlock(q);
 503         queuefree(q);
 504         return result;
 505 }
 506
 507
 508 /* use or unuse this queue -
 509  * if it is the first client, starts the timer.
 510  * if it is not longer used by any clients, stop the timer.
 511  */
 512 int snd_seq_queue_use(int queueid, int client, int use)
 513 {
 514         struct snd_seq_queue *queue;
 515
 516         queue = queueptr(queueid);
 517         if (queue == NULL)
 518                 return -EINVAL;
 519         mutex_lock(&queue->timer_mutex);
 520         if (use) {
 521                 if (!test_and_set_bit(client, queue->clients_bitmap))
 522                         queue->clients++;
 523         } else {
 524                 if (test_and_clear_bit(client, queue->clients_bitmap))
 525                         queue->clients--;
 526         }
 527         if (queue->clients) {
 528                 if (use && queue->clients == 1)
 529                         snd_seq_timer_defaults(queue->timer);
 530                 snd_seq_timer_open(queue);
 531         } else {
 532                 snd_seq_timer_close(queue);
 533         }
 534         mutex_unlock(&queue->timer_mutex);
 535         queuefree(queue);
 536         return 0;
 537 }
 538
 539 /*
 540  * check if queue is used by the client
 541  * return negative value if the queue is invalid.
 542  * return 0 if not used, 1 if used.
 543  */
 544 int snd_seq_queue_is_used(int queueid, int client)
 545 {
 546         struct snd_seq_queue *q;
 547         int result;
 548
 549         q = queueptr(queueid);
 550         if (q == NULL)
 551                 return -EINVAL; /* invalid queue */
 552         result = test_bit(client, q->clients_bitmap) ? 1 : 0;
 553         queuefree(q);
 554         return result;
 555 }
 556
 557
 558 /*----------------------------------------------------------------*/
 559
 560 /* notification that client has left the system -
 561  * stop the timer on all queues owned by this client
 562  */
 563 void snd_seq_queue_client_termination(int client)
 564 {
 565         unsigned long flags;
 566         int i;
 567         struct snd_seq_queue *q;
 568
 569         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
 570                 if ((q = queueptr(i)) == NULL)
 571                         continue;
 572                 spin_lock_irqsave(&q->owner_lock, flags);
 573                 if (q->owner == client)
 574                         q->klocked = 1;
 575                 spin_unlock_irqrestore(&q->owner_lock, flags);
 576                 if (q->owner == client) {
 577                         if (q->timer->running)
 578                                 snd_seq_timer_stop(q->timer);
 579                         snd_seq_timer_reset(q->timer);
 580                 }
 581                 queuefree(q);
 582         }
 583 }
 584
 585 /* final stage notification -
 586  * remove cells for no longer exist client (for non-owned queue)
 587  * or delete this queue (for owned queue)
 588  */
 589 void snd_seq_queue_client_leave(int client)
 590 {
 591         int i;
 592         struct snd_seq_queue *q;
 593
 594         /* delete own queues from queue list */
 595         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
 596                 if ((q = queue_list_remove(i, client)) != NULL)
 597                         queue_delete(q);
 598         }
 599
 600         /* remove cells from existing queues -
 601          * they are not owned by this client
 602          */
 603         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
 604                 if ((q = queueptr(i)) == NULL)
 605                         continue;
 606                 if (test_bit(client, q->clients_bitmap)) {
 607                         snd_seq_prioq_leave(q->tickq, client, 0);
 608                         snd_seq_prioq_leave(q->timeq, client, 0);
 609                         snd_seq_queue_use(q->queue, client, 0);
 610                 }
 611                 queuefree(q);
 612         }
 613 }
 614
 615
 616
 617 /*----------------------------------------------------------------*/
 618
 619 /* remove cells from all queues */
 620 void snd_seq_queue_client_leave_cells(int client)
 621 {
 622         int i;
 623         struct snd_seq_queue *q;
 624
 625         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
 626                 if ((q = queueptr(i)) == NULL)
 627                         continue;
 628                 snd_seq_prioq_leave(q->tickq, client, 0);
 629                 snd_seq_prioq_leave(q->timeq, client, 0);
 630                 queuefree(q);
 631         }
 632 }
 633
 634 /* remove cells based on flush criteria */
 635 void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info)
 636 {
 637         int i;
 638         struct snd_seq_queue *q;
 639
 640         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
 641                 if ((q = queueptr(i)) == NULL)
 642                         continue;
 643                 if (test_bit(client, q->clients_bitmap) &&
 644                     (! (info->remove_mode & SNDRV_SEQ_REMOVE_DEST) ||
 645                      q->queue == info->queue)) {
 646                         snd_seq_prioq_remove_events(q->tickq, client, info);
 647                         snd_seq_prioq_remove_events(q->timeq, client, info);
 648                 }
 649                 queuefree(q);
 650         }
 651 }
 652
 653 /*----------------------------------------------------------------*/
 654
 655 /*
 656  * send events to all subscribed ports
 657  */
 658 static void queue_broadcast_event(struct snd_seq_queue *q, struct snd_seq_event *ev,
 659                                   int atomic, int hop)
 660 {
 661         struct snd_seq_event sev;
 662
 663         sev = *ev;
 664
 665         sev.flags = SNDRV_SEQ_TIME_STAMP_TICK|SNDRV_SEQ_TIME_MODE_ABS;
 666         sev.time.tick = q->timer->tick.cur_tick;
 667         sev.queue = q->queue;
 668         sev.data.queue.queue = q->queue;
 669
 670         /* broadcast events from Timer port */
 671         sev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
 672         sev.source.port = SNDRV_SEQ_PORT_SYSTEM_TIMER;
 673         sev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
 674         snd_seq_kernel_client_dispatch(SNDRV_SEQ_CLIENT_SYSTEM, &sev, atomic, hop);
 675 }
 676
 677 /*
 678  * process a received queue-control event.
 679  * this function is exported for seq_sync.c.
 680  */
 681 static void snd_seq_queue_process_event(struct snd_seq_queue *q,
 682                                         struct snd_seq_event *ev,
 683                                         int atomic, int hop)
 684 {
 685         switch (ev->type) {
 686         case SNDRV_SEQ_EVENT_START:
 687                 snd_seq_prioq_leave(q->tickq, ev->source.client, 1);
 688                 snd_seq_prioq_leave(q->timeq, ev->source.client, 1);
 689                 if (! snd_seq_timer_start(q->timer))
 690                         queue_broadcast_event(q, ev, atomic, hop);
 691                 break;
 692
 693         case SNDRV_SEQ_EVENT_CONTINUE:
 694                 if (! snd_seq_timer_continue(q->timer))
 695                         queue_broadcast_event(q, ev, atomic, hop);
 696                 break;
 697
 698         case SNDRV_SEQ_EVENT_STOP:
 699                 snd_seq_timer_stop(q->timer);
 700                 queue_broadcast_event(q, ev, atomic, hop);
 701                 break;
 702
 703         case SNDRV_SEQ_EVENT_TEMPO:
 704                 snd_seq_timer_set_tempo(q->timer, ev->data.queue.param.value);
 705                 queue_broadcast_event(q, ev, atomic, hop);
 706                 break;
 707
 708         case SNDRV_SEQ_EVENT_SETPOS_TICK:
 709                 if (snd_seq_timer_set_position_tick(q->timer, ev->data.queue.param.time.tick) == 0) {
 710                         queue_broadcast_event(q, ev, atomic, hop);
 711                 }
 712                 break;
 713
 714         case SNDRV_SEQ_EVENT_SETPOS_TIME:
 715                 if (snd_seq_timer_set_position_time(q->timer, ev->data.queue.param.time.time) == 0) {
 716                         queue_broadcast_event(q, ev, atomic, hop);
 717                 }
 718                 break;
 719         case SNDRV_SEQ_EVENT_QUEUE_SKEW:
 720                 if (snd_seq_timer_set_skew(q->timer,
 721                                            ev->data.queue.param.skew.value,
 722                                            ev->data.queue.param.skew.base) == 0) {
 723                         queue_broadcast_event(q, ev, atomic, hop);
 724                 }
 725                 break;
 726         }
 727 }
 728
 729
 730 /*
 731  * Queue control via timer control port:
 732  * this function is exported as a callback of timer port.
 733  */
 734 int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop)
 735 {
 736         struct snd_seq_queue *q;
 737
 738         if (snd_BUG_ON(!ev))
 739                 return -EINVAL;
 740         q = queueptr(ev->data.queue.queue);
 741
 742         if (q == NULL)
 743                 return -EINVAL;
 744
 745         if (! queue_access_lock(q, ev->source.client)) {
 746                 queuefree(q);
 747                 return -EPERM;
 748         }
 749
 750         snd_seq_queue_process_event(q, ev, atomic, hop);
 751
 752         queue_access_unlock(q);
 753         queuefree(q);
 754         return 0;
 755 }
 756
 757
 758 /*----------------------------------------------------------------*/
 759
 760 #ifdef CONFIG_PROC_FS
 761 /* exported to seq_info.c */
 762 void snd_seq_info_queues_read(struct snd_info_entry *entry,
 763                               struct snd_info_buffer *buffer)
 764 {
 765         int i, bpm;
 766         struct snd_seq_queue *q;
 767         struct snd_seq_timer *tmr;
 768
 769         for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
 770                 if ((q = queueptr(i)) == NULL)
 771                         continue;
 772
 773                 tmr = q->timer;
 774                 if (tmr->tempo)
 775                         bpm = 60000000 / tmr->tempo;
 776                 else
 777                         bpm = 0;
 778
 779                 snd_iprintf(buffer, "queue %d: [%s]\n", q->queue, q->name);
 780                 snd_iprintf(buffer, "owned by client    : %d\n", q->owner);
 781                 snd_iprintf(buffer, "lock status        : %s\n", q->locked ? "Locked" : "Free");
 782                 snd_iprintf(buffer, "queued time events : %d\n", snd_seq_prioq_avail(q->timeq));
 783                 snd_iprintf(buffer, "queued tick events : %d\n", snd_seq_prioq_avail(q->tickq));
 784                 snd_iprintf(buffer, "timer state        : %s\n", tmr->running ? "Running" : "Stopped");
 785                 snd_iprintf(buffer, "timer PPQ          : %d\n", tmr->ppq);
 786                 snd_iprintf(buffer, "current tempo      : %d\n", tmr->tempo);
 787                 snd_iprintf(buffer, "current BPM        : %d\n", bpm);
 788                 snd_iprintf(buffer, "current time       : %d.%09d s\n", tmr->cur_time.tv_sec, tmr->cur_time.tv_nsec);
 789                 snd_iprintf(buffer, "current tick       : %d\n", tmr->tick.cur_tick);
 790                 snd_iprintf(buffer, "\n");
 791                 queuefree(q);
 792         }
 793 }
 794 #endif /* CONFIG_PROC_FS */
 795