sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <linux/device.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <sound/core.h>
  31 #include <sound/timer.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/minors.h>
  35 #include <sound/initval.h>
  36 #include <linux/kmod.h>
  37
  38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
  39 #define DEFAULT_TIMER_LIMIT 4
  40 #else
  41 #define DEFAULT_TIMER_LIMIT 1
  42 #endif
  43
  44 static int timer_limit = DEFAULT_TIMER_LIMIT;
  45 static int timer_tstamp_monotonic = 1;
  46 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  47 MODULE_DESCRIPTION("ALSA timer interface");
  48 MODULE_LICENSE("GPL");
  49 module_param(timer_limit, int, 0444);
  50 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  51 module_param(timer_tstamp_monotonic, int, 0444);
  52 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  53
  54 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  55 MODULE_ALIAS("devname:snd/timer");
  56
  57 struct snd_timer_user {
  58         struct snd_timer_instance *timeri;
  59         int tread;              /* enhanced read with timestamps and events */
  60         unsigned long ticks;
  61         unsigned long overrun;
  62         int qhead;
  63         int qtail;
  64         int qused;
  65         int queue_size;
  66         bool disconnected;
  67         struct snd_timer_read *queue;
  68         struct snd_timer_tread *tqueue;
  69         spinlock_t qlock;
  70         unsigned long last_resolution;
  71         unsigned int filter;
  72         struct timespec tstamp;         /* trigger tstamp */
  73         wait_queue_head_t qchange_sleep;
  74         struct fasync_struct *fasync;
  75         struct mutex ioctl_lock;
  76 };
  77
  78 /* list of timers */
  79 static LIST_HEAD(snd_timer_list);
  80
  81 /* list of slave instances */
  82 static LIST_HEAD(snd_timer_slave_list);
  83
  84 /* lock for slave active lists */
  85 static DEFINE_SPINLOCK(slave_active_lock);
  86
  87 static DEFINE_MUTEX(register_mutex);
  88
  89 static int snd_timer_free(struct snd_timer *timer);
  90 static int snd_timer_dev_free(struct snd_device *device);
  91 static int snd_timer_dev_register(struct snd_device *device);
  92 static int snd_timer_dev_disconnect(struct snd_device *device);
  93
  94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  95
  96 /*
  97  * create a timer instance with the given owner string.
  98  * when timer is not NULL, increments the module counter
  99  */
 100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 101                                                          struct snd_timer *timer)
 102 {
 103         struct snd_timer_instance *timeri;
 104         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 105         if (timeri == NULL)
 106                 return NULL;
 107         timeri->owner = kstrdup(owner, GFP_KERNEL);
 108         if (! timeri->owner) {
 109                 kfree(timeri);
 110                 return NULL;
 111         }
 112         INIT_LIST_HEAD(&timeri->open_list);
 113         INIT_LIST_HEAD(&timeri->active_list);
 114         INIT_LIST_HEAD(&timeri->ack_list);
 115         INIT_LIST_HEAD(&timeri->slave_list_head);
 116         INIT_LIST_HEAD(&timeri->slave_active_head);
 117
 118         timeri->timer = timer;
 119         if (timer && !try_module_get(timer->module)) {
 120                 kfree(timeri->owner);
 121                 kfree(timeri);
 122                 return NULL;
 123         }
 124
 125         return timeri;
 126 }
 127
 128 /*
 129  * find a timer instance from the given timer id
 130  */
 131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 132 {
 133         struct snd_timer *timer = NULL;
 134
 135         list_for_each_entry(timer, &snd_timer_list, device_list) {
 136                 if (timer->tmr_class != tid->dev_class)
 137                         continue;
 138                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 139                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 140                     (timer->card == NULL ||
 141                      timer->card->number != tid->card))
 142                         continue;
 143                 if (timer->tmr_device != tid->device)
 144                         continue;
 145                 if (timer->tmr_subdevice != tid->subdevice)
 146                         continue;
 147                 return timer;
 148         }
 149         return NULL;
 150 }
 151
 152 #ifdef CONFIG_MODULES
 153
 154 static void snd_timer_request(struct snd_timer_id *tid)
 155 {
 156         switch (tid->dev_class) {
 157         case SNDRV_TIMER_CLASS_GLOBAL:
 158                 if (tid->device < timer_limit)
 159                         request_module("snd-timer-%i", tid->device);
 160                 break;
 161         case SNDRV_TIMER_CLASS_CARD:
 162         case SNDRV_TIMER_CLASS_PCM:
 163                 if (tid->card < snd_ecards_limit)
 164                         request_module("snd-card-%i", tid->card);
 165                 break;
 166         default:
 167                 break;
 168         }
 169 }
 170
 171 #endif
 172
 173 /*
 174  * look for a master instance matching with the slave id of the given slave.
 175  * when found, relink the open_link of the slave.
 176  *
 177  * call this with register_mutex down.
 178  */
 179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 180 {
 181         struct snd_timer *timer;
 182         struct snd_timer_instance *master;
 183
 184         /* FIXME: it's really dumb to look up all entries.. */
 185         list_for_each_entry(timer, &snd_timer_list, device_list) {
 186                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 187                         if (slave->slave_class == master->slave_class &&
 188                             slave->slave_id == master->slave_id) {
 189                                 list_move_tail(&slave->open_list,
 190                                                &master->slave_list_head);
 191                                 spin_lock_irq(&slave_active_lock);
 192                                 slave->master = master;
 193                                 slave->timer = master->timer;
 194                                 spin_unlock_irq(&slave_active_lock);
 195                                 return;
 196                         }
 197                 }
 198         }
 199 }
 200
 201 /*
 202  * look for slave instances matching with the slave id of the given master.
 203  * when found, relink the open_link of slaves.
 204  *
 205  * call this with register_mutex down.
 206  */
 207 static void snd_timer_check_master(struct snd_timer_instance *master)
 208 {
 209         struct snd_timer_instance *slave, *tmp;
 210
 211         /* check all pending slaves */
 212         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 213                 if (slave->slave_class == master->slave_class &&
 214                     slave->slave_id == master->slave_id) {
 215                         list_move_tail(&slave->open_list, &master->slave_list_head);
 216                         spin_lock_irq(&slave_active_lock);
 217                         spin_lock(&master->timer->lock);
 218                         slave->master = master;
 219                         slave->timer = master->timer;
 220                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 221                                 list_add_tail(&slave->active_list,
 222                                               &master->slave_active_head);
 223                         spin_unlock(&master->timer->lock);
 224                         spin_unlock_irq(&slave_active_lock);
 225                 }
 226         }
 227 }
 228
 229 /*
 230  * open a timer instance
 231  * when opening a master, the slave id must be here given.
 232  */
 233 int snd_timer_open(struct snd_timer_instance **ti,
 234                    char *owner, struct snd_timer_id *tid,
 235                    unsigned int slave_id)
 236 {
 237         struct snd_timer *timer;
 238         struct snd_timer_instance *timeri = NULL;
 239
 240         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 241                 /* open a slave instance */
 242                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 243                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 244                         pr_debug("ALSA: timer: invalid slave class %i\n",
 245                                  tid->dev_sclass);
 246                         return -EINVAL;
 247                 }
 248                 mutex_lock(&register_mutex);
 249                 timeri = snd_timer_instance_new(owner, NULL);
 250                 if (!timeri) {
 251                         mutex_unlock(&register_mutex);
 252                         return -ENOMEM;
 253                 }
 254                 timeri->slave_class = tid->dev_sclass;
 255                 timeri->slave_id = tid->device;
 256                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 257                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 258                 snd_timer_check_slave(timeri);
 259                 mutex_unlock(&register_mutex);
 260                 *ti = timeri;
 261                 return 0;
 262         }
 263
 264         /* open a master instance */
 265         mutex_lock(&register_mutex);
 266         timer = snd_timer_find(tid);
 267 #ifdef CONFIG_MODULES
 268         if (!timer) {
 269                 mutex_unlock(&register_mutex);
 270                 snd_timer_request(tid);
 271                 mutex_lock(&register_mutex);
 272                 timer = snd_timer_find(tid);
 273         }
 274 #endif
 275         if (!timer) {
 276                 mutex_unlock(&register_mutex);
 277                 return -ENODEV;
 278         }
 279         if (!list_empty(&timer->open_list_head)) {
 280                 timeri = list_entry(timer->open_list_head.next,
 281                                     struct snd_timer_instance, open_list);
 282                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 283                         mutex_unlock(&register_mutex);
 284                         return -EBUSY;
 285                 }
 286         }
 287         timeri = snd_timer_instance_new(owner, timer);
 288         if (!timeri) {
 289                 mutex_unlock(&register_mutex);
 290                 return -ENOMEM;
 291         }
 292         /* take a card refcount for safe disconnection */
 293         if (timer->card)
 294                 get_device(&timer->card->card_dev);
 295         timeri->slave_class = tid->dev_sclass;
 296         timeri->slave_id = slave_id;
 297         if (list_empty(&timer->open_list_head) && timer->hw.open)
 298                 timer->hw.open(timer);
 299         list_add_tail(&timeri->open_list, &timer->open_list_head);
 300         snd_timer_check_master(timeri);
 301         mutex_unlock(&register_mutex);
 302         *ti = timeri;
 303         return 0;
 304 }
 305
 306 /*
 307  * close a timer instance
 308  */
 309 int snd_timer_close(struct snd_timer_instance *timeri)
 310 {
 311         struct snd_timer *timer = NULL;
 312         struct snd_timer_instance *slave, *tmp;
 313
 314         if (snd_BUG_ON(!timeri))
 315                 return -ENXIO;
 316
 317         mutex_lock(&register_mutex);
 318         list_del(&timeri->open_list);
 319
 320         /* force to stop the timer */
 321         snd_timer_stop(timeri);
 322
 323         timer = timeri->timer;
 324         if (timer) {
 325                 /* wait, until the active callback is finished */
 326                 spin_lock_irq(&timer->lock);
 327                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 328                         spin_unlock_irq(&timer->lock);
 329                         udelay(10);
 330                         spin_lock_irq(&timer->lock);
 331                 }
 332                 spin_unlock_irq(&timer->lock);
 333
 334                 /* remove slave links */
 335                 spin_lock_irq(&slave_active_lock);
 336                 spin_lock(&timer->lock);
 337                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 338                                          open_list) {
 339                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 340                         slave->master = NULL;
 341                         slave->timer = NULL;
 342                         list_del_init(&slave->ack_list);
 343                         list_del_init(&slave->active_list);
 344                 }
 345                 spin_unlock(&timer->lock);
 346                 spin_unlock_irq(&slave_active_lock);
 347
 348                 /* slave doesn't need to release timer resources below */
 349                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 350                         timer = NULL;
 351         }
 352
 353         if (timeri->private_free)
 354                 timeri->private_free(timeri);
 355         kfree(timeri->owner);
 356         kfree(timeri);
 357
 358         if (timer) {
 359                 if (list_empty(&timer->open_list_head) && timer->hw.close)
 360                         timer->hw.close(timer);
 361                 /* release a card refcount for safe disconnection */
 362                 if (timer->card)
 363                         put_device(&timer->card->card_dev);
 364                 module_put(timer->module);
 365         }
 366
 367         mutex_unlock(&register_mutex);
 368         return 0;
 369 }
 370
 371 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 372 {
 373         struct snd_timer * timer;
 374
 375         if (timeri == NULL)
 376                 return 0;
 377         if ((timer = timeri->timer) != NULL) {
 378                 if (timer->hw.c_resolution)
 379                         return timer->hw.c_resolution(timer);
 380                 return timer->hw.resolution;
 381         }
 382         return 0;
 383 }
 384
 385 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 386 {
 387         struct snd_timer *timer;
 388         unsigned long resolution = 0;
 389         struct snd_timer_instance *ts;
 390         struct timespec tstamp;
 391
 392         if (timer_tstamp_monotonic)
 393                 ktime_get_ts(&tstamp);
 394         else
 395                 getnstimeofday(&tstamp);
 396         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 397                        event > SNDRV_TIMER_EVENT_PAUSE))
 398                 return;
 399         if (event == SNDRV_TIMER_EVENT_START ||
 400             event == SNDRV_TIMER_EVENT_CONTINUE)
 401                 resolution = snd_timer_resolution(ti);
 402         if (ti->ccallback)
 403                 ti->ccallback(ti, event, &tstamp, resolution);
 404         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 405                 return;
 406         timer = ti->timer;
 407         if (timer == NULL)
 408                 return;
 409         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 410                 return;
 411         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 412                 if (ts->ccallback)
 413                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 414 }
 415
 416 /* start/continue a master timer */
 417 static int snd_timer_start1(struct snd_timer_instance *timeri,
 418                             bool start, unsigned long ticks)
 419 {
 420         struct snd_timer *timer;
 421         int result;
 422         unsigned long flags;
 423
 424         timer = timeri->timer;
 425         if (!timer)
 426                 return -EINVAL;
 427
 428         spin_lock_irqsave(&timer->lock, flags);
 429         if (timer->card && timer->card->shutdown) {
 430                 result = -ENODEV;
 431                 goto unlock;
 432         }
 433         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 434                              SNDRV_TIMER_IFLG_START)) {
 435                 result = -EBUSY;
 436                 goto unlock;
 437         }
 438
 439         if (start)
 440                 timeri->ticks = timeri->cticks = ticks;
 441         else if (!timeri->cticks)
 442                 timeri->cticks = 1;
 443         timeri->pticks = 0;
 444
 445         list_move_tail(&timeri->active_list, &timer->active_list_head);
 446         if (timer->running) {
 447                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 448                         goto __start_now;
 449                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 450                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 451                 result = 1; /* delayed start */
 452         } else {
 453                 if (start)
 454                         timer->sticks = ticks;
 455                 timer->hw.start(timer);
 456               __start_now:
 457                 timer->running++;
 458                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 459                 result = 0;
 460         }
 461         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 462                           SNDRV_TIMER_EVENT_CONTINUE);
 463  unlock:
 464         spin_unlock_irqrestore(&timer->lock, flags);
 465         return result;
 466 }
 467
 468 /* start/continue a slave timer */
 469 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
 470                                  bool start)
 471 {
 472         unsigned long flags;
 473
 474         spin_lock_irqsave(&slave_active_lock, flags);
 475         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 476                 spin_unlock_irqrestore(&slave_active_lock, flags);
 477                 return -EBUSY;
 478         }
 479         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 480         if (timeri->master && timeri->timer) {
 481                 spin_lock(&timeri->timer->lock);
 482                 list_add_tail(&timeri->active_list,
 483                               &timeri->master->slave_active_head);
 484                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 485                                   SNDRV_TIMER_EVENT_CONTINUE);
 486                 spin_unlock(&timeri->timer->lock);
 487         }
 488         spin_unlock_irqrestore(&slave_active_lock, flags);
 489         return 1; /* delayed start */
 490 }
 491
 492 /* stop/pause a master timer */
 493 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
 494 {
 495         struct snd_timer *timer;
 496         int result = 0;
 497         unsigned long flags;
 498
 499         timer = timeri->timer;
 500         if (!timer)
 501                 return -EINVAL;
 502         spin_lock_irqsave(&timer->lock, flags);
 503         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 504                                SNDRV_TIMER_IFLG_START))) {
 505                 result = -EBUSY;
 506                 goto unlock;
 507         }
 508         list_del_init(&timeri->ack_list);
 509         list_del_init(&timeri->active_list);
 510         if (timer->card && timer->card->shutdown)
 511                 goto unlock;
 512         if (stop) {
 513                 timeri->cticks = timeri->ticks;
 514                 timeri->pticks = 0;
 515         }
 516         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 517             !(--timer->running)) {
 518                 timer->hw.stop(timer);
 519                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 520                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 521                         snd_timer_reschedule(timer, 0);
 522                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 523                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 524                                 timer->hw.start(timer);
 525                         }
 526                 }
 527         }
 528         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 529         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 530                           SNDRV_TIMER_EVENT_CONTINUE);
 531  unlock:
 532         spin_unlock_irqrestore(&timer->lock, flags);
 533         return result;
 534 }
 535
 536 /* stop/pause a slave timer */
 537 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
 538 {
 539         unsigned long flags;
 540
 541         spin_lock_irqsave(&slave_active_lock, flags);
 542         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 543                 spin_unlock_irqrestore(&slave_active_lock, flags);
 544                 return -EBUSY;
 545         }
 546         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 547         if (timeri->timer) {
 548                 spin_lock(&timeri->timer->lock);
 549                 list_del_init(&timeri->ack_list);
 550                 list_del_init(&timeri->active_list);
 551                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 552                                   SNDRV_TIMER_EVENT_CONTINUE);
 553                 spin_unlock(&timeri->timer->lock);
 554         }
 555         spin_unlock_irqrestore(&slave_active_lock, flags);
 556         return 0;
 557 }
 558
 559 /*
 560  *  start the timer instance
 561  */
 562 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 563 {
 564         if (timeri == NULL || ticks < 1)
 565                 return -EINVAL;
 566         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 567                 return snd_timer_start_slave(timeri, true);
 568         else
 569                 return snd_timer_start1(timeri, true, ticks);
 570 }
 571
 572 /*
 573  * stop the timer instance.
 574  *
 575  * do not call this from the timer callback!
 576  */
 577 int snd_timer_stop(struct snd_timer_instance *timeri)
 578 {
 579         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 580                 return snd_timer_stop_slave(timeri, true);
 581         else
 582                 return snd_timer_stop1(timeri, true);
 583 }
 584
 585 /*
 586  * start again..  the tick is kept.
 587  */
 588 int snd_timer_continue(struct snd_timer_instance *timeri)
 589 {
 590         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 591                 return snd_timer_start_slave(timeri, false);
 592         else
 593                 return snd_timer_start1(timeri, false, 0);
 594 }
 595
 596 /*
 597  * pause.. remember the ticks left
 598  */
 599 int snd_timer_pause(struct snd_timer_instance * timeri)
 600 {
 601         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 602                 return snd_timer_stop_slave(timeri, false);
 603         else
 604                 return snd_timer_stop1(timeri, false);
 605 }
 606
 607 /*
 608  * reschedule the timer
 609  *
 610  * start pending instances and check the scheduling ticks.
 611  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 612  */
 613 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 614 {
 615         struct snd_timer_instance *ti;
 616         unsigned long ticks = ~0UL;
 617
 618         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 619                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 620                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 621                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 622                         timer->running++;
 623                 }
 624                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 625                         if (ticks > ti->cticks)
 626                                 ticks = ti->cticks;
 627                 }
 628         }
 629         if (ticks == ~0UL) {
 630                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 631                 return;
 632         }
 633         if (ticks > timer->hw.ticks)
 634                 ticks = timer->hw.ticks;
 635         if (ticks_left != ticks)
 636                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 637         timer->sticks = ticks;
 638 }
 639
 640 /*
 641  * timer tasklet
 642  *
 643  */
 644 static void snd_timer_tasklet(unsigned long arg)
 645 {
 646         struct snd_timer *timer = (struct snd_timer *) arg;
 647         struct snd_timer_instance *ti;
 648         struct list_head *p;
 649         unsigned long resolution, ticks;
 650         unsigned long flags;
 651
 652         if (timer->card && timer->card->shutdown)
 653                 return;
 654
 655         spin_lock_irqsave(&timer->lock, flags);
 656         /* now process all callbacks */
 657         while (!list_empty(&timer->sack_list_head)) {
 658                 p = timer->sack_list_head.next;         /* get first item */
 659                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 660
 661                 /* remove from ack_list and make empty */
 662                 list_del_init(p);
 663
 664                 ticks = ti->pticks;
 665                 ti->pticks = 0;
 666                 resolution = ti->resolution;
 667
 668                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 669                 spin_unlock(&timer->lock);
 670                 if (ti->callback)
 671                         ti->callback(ti, resolution, ticks);
 672                 spin_lock(&timer->lock);
 673                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 674         }
 675         spin_unlock_irqrestore(&timer->lock, flags);
 676 }
 677
 678 /*
 679  * timer interrupt
 680  *
 681  * ticks_left is usually equal to timer->sticks.
 682  *
 683  */
 684 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 685 {
 686         struct snd_timer_instance *ti, *ts, *tmp;
 687         unsigned long resolution, ticks;
 688         struct list_head *p, *ack_list_head;
 689         unsigned long flags;
 690         int use_tasklet = 0;
 691
 692         if (timer == NULL)
 693                 return;
 694
 695         if (timer->card && timer->card->shutdown)
 696                 return;
 697
 698         spin_lock_irqsave(&timer->lock, flags);
 699
 700         /* remember the current resolution */
 701         if (timer->hw.c_resolution)
 702                 resolution = timer->hw.c_resolution(timer);
 703         else
 704                 resolution = timer->hw.resolution;
 705
 706         /* loop for all active instances
 707          * Here we cannot use list_for_each_entry because the active_list of a
 708          * processed instance is relinked to done_list_head before the callback
 709          * is called.
 710          */
 711         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 712                                  active_list) {
 713                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 714                         continue;
 715                 ti->pticks += ticks_left;
 716                 ti->resolution = resolution;
 717                 if (ti->cticks < ticks_left)
 718                         ti->cticks = 0;
 719                 else
 720                         ti->cticks -= ticks_left;
 721                 if (ti->cticks) /* not expired */
 722                         continue;
 723                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 724                         ti->cticks = ti->ticks;
 725                 } else {
 726                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 727                         --timer->running;
 728                         list_del_init(&ti->active_list);
 729                 }
 730                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 731                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 732                         ack_list_head = &timer->ack_list_head;
 733                 else
 734                         ack_list_head = &timer->sack_list_head;
 735                 if (list_empty(&ti->ack_list))
 736                         list_add_tail(&ti->ack_list, ack_list_head);
 737                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 738                         ts->pticks = ti->pticks;
 739                         ts->resolution = resolution;
 740                         if (list_empty(&ts->ack_list))
 741                                 list_add_tail(&ts->ack_list, ack_list_head);
 742                 }
 743         }
 744         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 745                 snd_timer_reschedule(timer, timer->sticks);
 746         if (timer->running) {
 747                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 748                         timer->hw.stop(timer);
 749                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 750                 }
 751                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 752                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 753                         /* restart timer */
 754                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 755                         timer->hw.start(timer);
 756                 }
 757         } else {
 758                 timer->hw.stop(timer);
 759         }
 760
 761         /* now process all fast callbacks */
 762         while (!list_empty(&timer->ack_list_head)) {
 763                 p = timer->ack_list_head.next;          /* get first item */
 764                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 765
 766                 /* remove from ack_list and make empty */
 767                 list_del_init(p);
 768
 769                 ticks = ti->pticks;
 770                 ti->pticks = 0;
 771
 772                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 773                 spin_unlock(&timer->lock);
 774                 if (ti->callback)
 775                         ti->callback(ti, resolution, ticks);
 776                 spin_lock(&timer->lock);
 777                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 778         }
 779
 780         /* do we have any slow callbacks? */
 781         use_tasklet = !list_empty(&timer->sack_list_head);
 782         spin_unlock_irqrestore(&timer->lock, flags);
 783
 784         if (use_tasklet)
 785                 tasklet_schedule(&timer->task_queue);
 786 }
 787
 788 /*
 789
 790  */
 791
 792 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 793                   struct snd_timer **rtimer)
 794 {
 795         struct snd_timer *timer;
 796         int err;
 797         static struct snd_device_ops ops = {
 798                 .dev_free = snd_timer_dev_free,
 799                 .dev_register = snd_timer_dev_register,
 800                 .dev_disconnect = snd_timer_dev_disconnect,
 801         };
 802
 803         if (snd_BUG_ON(!tid))
 804                 return -EINVAL;
 805         if (rtimer)
 806                 *rtimer = NULL;
 807         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 808         if (!timer)
 809                 return -ENOMEM;
 810         timer->tmr_class = tid->dev_class;
 811         timer->card = card;
 812         timer->tmr_device = tid->device;
 813         timer->tmr_subdevice = tid->subdevice;
 814         if (id)
 815                 strlcpy(timer->id, id, sizeof(timer->id));
 816         timer->sticks = 1;
 817         INIT_LIST_HEAD(&timer->device_list);
 818         INIT_LIST_HEAD(&timer->open_list_head);
 819         INIT_LIST_HEAD(&timer->active_list_head);
 820         INIT_LIST_HEAD(&timer->ack_list_head);
 821         INIT_LIST_HEAD(&timer->sack_list_head);
 822         spin_lock_init(&timer->lock);
 823         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 824                      (unsigned long)timer);
 825         if (card != NULL) {
 826                 timer->module = card->module;
 827                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 828                 if (err < 0) {
 829                         snd_timer_free(timer);
 830                         return err;
 831                 }
 832         }
 833         if (rtimer)
 834                 *rtimer = timer;
 835         return 0;
 836 }
 837
 838 static int snd_timer_free(struct snd_timer *timer)
 839 {
 840         if (!timer)
 841                 return 0;
 842
 843         mutex_lock(&register_mutex);
 844         if (! list_empty(&timer->open_list_head)) {
 845                 struct list_head *p, *n;
 846                 struct snd_timer_instance *ti;
 847                 pr_warn("ALSA: timer %p is busy?\n", timer);
 848                 list_for_each_safe(p, n, &timer->open_list_head) {
 849                         list_del_init(p);
 850                         ti = list_entry(p, struct snd_timer_instance, open_list);
 851                         ti->timer = NULL;
 852                 }
 853         }
 854         list_del(&timer->device_list);
 855         mutex_unlock(&register_mutex);
 856
 857         if (timer->private_free)
 858                 timer->private_free(timer);
 859         kfree(timer);
 860         return 0;
 861 }
 862
 863 static int snd_timer_dev_free(struct snd_device *device)
 864 {
 865         struct snd_timer *timer = device->device_data;
 866         return snd_timer_free(timer);
 867 }
 868
 869 static int snd_timer_dev_register(struct snd_device *dev)
 870 {
 871         struct snd_timer *timer = dev->device_data;
 872         struct snd_timer *timer1;
 873
 874         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 875                 return -ENXIO;
 876         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 877             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 878                 return -EINVAL;
 879
 880         mutex_lock(&register_mutex);
 881         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 882                 if (timer1->tmr_class > timer->tmr_class)
 883                         break;
 884                 if (timer1->tmr_class < timer->tmr_class)
 885                         continue;
 886                 if (timer1->card && timer->card) {
 887                         if (timer1->card->number > timer->card->number)
 888                                 break;
 889                         if (timer1->card->number < timer->card->number)
 890                                 continue;
 891                 }
 892                 if (timer1->tmr_device > timer->tmr_device)
 893                         break;
 894                 if (timer1->tmr_device < timer->tmr_device)
 895                         continue;
 896                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 897                         break;
 898                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 899                         continue;
 900                 /* conflicts.. */
 901                 mutex_unlock(&register_mutex);
 902                 return -EBUSY;
 903         }
 904         list_add_tail(&timer->device_list, &timer1->device_list);
 905         mutex_unlock(&register_mutex);
 906         return 0;
 907 }
 908
 909 static int snd_timer_dev_disconnect(struct snd_device *device)
 910 {
 911         struct snd_timer *timer = device->device_data;
 912         struct snd_timer_instance *ti;
 913
 914         mutex_lock(&register_mutex);
 915         list_del_init(&timer->device_list);
 916         /* wake up pending sleepers */
 917         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 918                 if (ti->disconnect)
 919                         ti->disconnect(ti);
 920         }
 921         mutex_unlock(&register_mutex);
 922         return 0;
 923 }
 924
 925 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 926 {
 927         unsigned long flags;
 928         unsigned long resolution = 0;
 929         struct snd_timer_instance *ti, *ts;
 930
 931         if (timer->card && timer->card->shutdown)
 932                 return;
 933         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 934                 return;
 935         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 936                        event > SNDRV_TIMER_EVENT_MRESUME))
 937                 return;
 938         spin_lock_irqsave(&timer->lock, flags);
 939         if (event == SNDRV_TIMER_EVENT_MSTART ||
 940             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 941             event == SNDRV_TIMER_EVENT_MRESUME) {
 942                 if (timer->hw.c_resolution)
 943                         resolution = timer->hw.c_resolution(timer);
 944                 else
 945                         resolution = timer->hw.resolution;
 946         }
 947         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 948                 if (ti->ccallback)
 949                         ti->ccallback(ti, event, tstamp, resolution);
 950                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 951                         if (ts->ccallback)
 952                                 ts->ccallback(ts, event, tstamp, resolution);
 953         }
 954         spin_unlock_irqrestore(&timer->lock, flags);
 955 }
 956
 957 /*
 958  * exported functions for global timers
 959  */
 960 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 961 {
 962         struct snd_timer_id tid;
 963
 964         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 965         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 966         tid.card = -1;
 967         tid.device = device;
 968         tid.subdevice = 0;
 969         return snd_timer_new(NULL, id, &tid, rtimer);
 970 }
 971
 972 int snd_timer_global_free(struct snd_timer *timer)
 973 {
 974         return snd_timer_free(timer);
 975 }
 976
 977 int snd_timer_global_register(struct snd_timer *timer)
 978 {
 979         struct snd_device dev;
 980
 981         memset(&dev, 0, sizeof(dev));
 982         dev.device_data = timer;
 983         return snd_timer_dev_register(&dev);
 984 }
 985
 986 /*
 987  *  System timer
 988  */
 989
 990 struct snd_timer_system_private {
 991         struct timer_list tlist;
 992         unsigned long last_expires;
 993         unsigned long last_jiffies;
 994         unsigned long correction;
 995 };
 996
 997 static void snd_timer_s_function(unsigned long data)
 998 {
 999         struct snd_timer *timer = (struct snd_timer *)data;
1000         struct snd_timer_system_private *priv = timer->private_data;
1001         unsigned long jiff = jiffies;
1002         if (time_after(jiff, priv->last_expires))
1003                 priv->correction += (long)jiff - (long)priv->last_expires;
1004         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1005 }
1006
1007 static int snd_timer_s_start(struct snd_timer * timer)
1008 {
1009         struct snd_timer_system_private *priv;
1010         unsigned long njiff;
1011
1012         priv = (struct snd_timer_system_private *) timer->private_data;
1013         njiff = (priv->last_jiffies = jiffies);
1014         if (priv->correction > timer->sticks - 1) {
1015                 priv->correction -= timer->sticks - 1;
1016                 njiff++;
1017         } else {
1018                 njiff += timer->sticks - priv->correction;
1019                 priv->correction = 0;
1020         }
1021         priv->last_expires = njiff;
1022         mod_timer(&priv->tlist, njiff);
1023         return 0;
1024 }
1025
1026 static int snd_timer_s_stop(struct snd_timer * timer)
1027 {
1028         struct snd_timer_system_private *priv;
1029         unsigned long jiff;
1030
1031         priv = (struct snd_timer_system_private *) timer->private_data;
1032         del_timer(&priv->tlist);
1033         jiff = jiffies;
1034         if (time_before(jiff, priv->last_expires))
1035                 timer->sticks = priv->last_expires - jiff;
1036         else
1037                 timer->sticks = 1;
1038         priv->correction = 0;
1039         return 0;
1040 }
1041
1042 static int snd_timer_s_close(struct snd_timer *timer)
1043 {
1044         struct snd_timer_system_private *priv;
1045
1046         priv = (struct snd_timer_system_private *)timer->private_data;
1047         del_timer_sync(&priv->tlist);
1048         return 0;
1049 }
1050
1051 static struct snd_timer_hardware snd_timer_system =
1052 {
1053         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1054         .resolution =   1000000000L / HZ,
1055         .ticks =        10000000L,
1056         .close =        snd_timer_s_close,
1057         .start =        snd_timer_s_start,
1058         .stop =         snd_timer_s_stop
1059 };
1060
1061 static void snd_timer_free_system(struct snd_timer *timer)
1062 {
1063         kfree(timer->private_data);
1064 }
1065
1066 static int snd_timer_register_system(void)
1067 {
1068         struct snd_timer *timer;
1069         struct snd_timer_system_private *priv;
1070         int err;
1071
1072         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1073         if (err < 0)
1074                 return err;
1075         strcpy(timer->name, "system timer");
1076         timer->hw = snd_timer_system;
1077         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1078         if (priv == NULL) {
1079                 snd_timer_free(timer);
1080                 return -ENOMEM;
1081         }
1082         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1083         timer->private_data = priv;
1084         timer->private_free = snd_timer_free_system;
1085         return snd_timer_global_register(timer);
1086 }
1087
1088 #ifdef CONFIG_SND_PROC_FS
1089 /*
1090  *  Info interface
1091  */
1092
1093 static void snd_timer_proc_read(struct snd_info_entry *entry,
1094                                 struct snd_info_buffer *buffer)
1095 {
1096         struct snd_timer *timer;
1097         struct snd_timer_instance *ti;
1098
1099         mutex_lock(&register_mutex);
1100         list_for_each_entry(timer, &snd_timer_list, device_list) {
1101                 if (timer->card && timer->card->shutdown)
1102                         continue;
1103                 switch (timer->tmr_class) {
1104                 case SNDRV_TIMER_CLASS_GLOBAL:
1105                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1106                         break;
1107                 case SNDRV_TIMER_CLASS_CARD:
1108                         snd_iprintf(buffer, "C%i-%i: ",
1109                                     timer->card->number, timer->tmr_device);
1110                         break;
1111                 case SNDRV_TIMER_CLASS_PCM:
1112                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1113                                     timer->tmr_device, timer->tmr_subdevice);
1114                         break;
1115                 default:
1116                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1117                                     timer->card ? timer->card->number : -1,
1118                                     timer->tmr_device, timer->tmr_subdevice);
1119                 }
1120                 snd_iprintf(buffer, "%s :", timer->name);
1121                 if (timer->hw.resolution)
1122                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1123                                     timer->hw.resolution / 1000,
1124                                     timer->hw.resolution % 1000,
1125                                     timer->hw.ticks);
1126                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1127                         snd_iprintf(buffer, " SLAVE");
1128                 snd_iprintf(buffer, "\n");
1129                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1130                         snd_iprintf(buffer, "  Client %s : %s\n",
1131                                     ti->owner ? ti->owner : "unknown",
1132                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1133                                                  SNDRV_TIMER_IFLG_RUNNING)
1134                                     ? "running" : "stopped");
1135         }
1136         mutex_unlock(&register_mutex);
1137 }
1138
1139 static struct snd_info_entry *snd_timer_proc_entry;
1140
1141 static void __init snd_timer_proc_init(void)
1142 {
1143         struct snd_info_entry *entry;
1144
1145         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1146         if (entry != NULL) {
1147                 entry->c.text.read = snd_timer_proc_read;
1148                 if (snd_info_register(entry) < 0) {
1149                         snd_info_free_entry(entry);
1150                         entry = NULL;
1151                 }
1152         }
1153         snd_timer_proc_entry = entry;
1154 }
1155
1156 static void __exit snd_timer_proc_done(void)
1157 {
1158         snd_info_free_entry(snd_timer_proc_entry);
1159 }
1160 #else /* !CONFIG_SND_PROC_FS */
1161 #define snd_timer_proc_init()
1162 #define snd_timer_proc_done()
1163 #endif
1164
1165 /*
1166  *  USER SPACE interface
1167  */
1168
1169 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1170                                      unsigned long resolution,
1171                                      unsigned long ticks)
1172 {
1173         struct snd_timer_user *tu = timeri->callback_data;
1174         struct snd_timer_read *r;
1175         int prev;
1176
1177         spin_lock(&tu->qlock);
1178         if (tu->qused > 0) {
1179                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1180                 r = &tu->queue[prev];
1181                 if (r->resolution == resolution) {
1182                         r->ticks += ticks;
1183                         goto __wake;
1184                 }
1185         }
1186         if (tu->qused >= tu->queue_size) {
1187                 tu->overrun++;
1188         } else {
1189                 r = &tu->queue[tu->qtail++];
1190                 tu->qtail %= tu->queue_size;
1191                 r->resolution = resolution;
1192                 r->ticks = ticks;
1193                 tu->qused++;
1194         }
1195       __wake:
1196         spin_unlock(&tu->qlock);
1197         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1198         wake_up(&tu->qchange_sleep);
1199 }
1200
1201 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1202                                             struct snd_timer_tread *tread)
1203 {
1204         if (tu->qused >= tu->queue_size) {
1205                 tu->overrun++;
1206         } else {
1207                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1208                 tu->qtail %= tu->queue_size;
1209                 tu->qused++;
1210         }
1211 }
1212
1213 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1214                                      int event,
1215                                      struct timespec *tstamp,
1216                                      unsigned long resolution)
1217 {
1218         struct snd_timer_user *tu = timeri->callback_data;
1219         struct snd_timer_tread r1;
1220         unsigned long flags;
1221
1222         if (event >= SNDRV_TIMER_EVENT_START &&
1223             event <= SNDRV_TIMER_EVENT_PAUSE)
1224                 tu->tstamp = *tstamp;
1225         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1226                 return;
1227         memset(&r1, 0, sizeof(r1));
1228         r1.event = event;
1229         r1.tstamp = *tstamp;
1230         r1.val = resolution;
1231         spin_lock_irqsave(&tu->qlock, flags);
1232         snd_timer_user_append_to_tqueue(tu, &r1);
1233         spin_unlock_irqrestore(&tu->qlock, flags);
1234         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1235         wake_up(&tu->qchange_sleep);
1236 }
1237
1238 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1239 {
1240         struct snd_timer_user *tu = timeri->callback_data;
1241
1242         tu->disconnected = true;
1243         wake_up(&tu->qchange_sleep);
1244 }
1245
1246 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1247                                       unsigned long resolution,
1248                                       unsigned long ticks)
1249 {
1250         struct snd_timer_user *tu = timeri->callback_data;
1251         struct snd_timer_tread *r, r1;
1252         struct timespec tstamp;
1253         int prev, append = 0;
1254
1255         memset(&tstamp, 0, sizeof(tstamp));
1256         spin_lock(&tu->qlock);
1257         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1258                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1259                 spin_unlock(&tu->qlock);
1260                 return;
1261         }
1262         if (tu->last_resolution != resolution || ticks > 0) {
1263                 if (timer_tstamp_monotonic)
1264                         ktime_get_ts(&tstamp);
1265                 else
1266                         getnstimeofday(&tstamp);
1267         }
1268         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1269             tu->last_resolution != resolution) {
1270                 memset(&r1, 0, sizeof(r1));
1271                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1272                 r1.tstamp = tstamp;
1273                 r1.val = resolution;
1274                 snd_timer_user_append_to_tqueue(tu, &r1);
1275                 tu->last_resolution = resolution;
1276                 append++;
1277         }
1278         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1279                 goto __wake;
1280         if (ticks == 0)
1281                 goto __wake;
1282         if (tu->qused > 0) {
1283                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1284                 r = &tu->tqueue[prev];
1285                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1286                         r->tstamp = tstamp;
1287                         r->val += ticks;
1288                         append++;
1289                         goto __wake;
1290                 }
1291         }
1292         r1.event = SNDRV_TIMER_EVENT_TICK;
1293         r1.tstamp = tstamp;
1294         r1.val = ticks;
1295         snd_timer_user_append_to_tqueue(tu, &r1);
1296         append++;
1297       __wake:
1298         spin_unlock(&tu->qlock);
1299         if (append == 0)
1300                 return;
1301         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1302         wake_up(&tu->qchange_sleep);
1303 }
1304
1305 static int snd_timer_user_open(struct inode *inode, struct file *file)
1306 {
1307         struct snd_timer_user *tu;
1308         int err;
1309
1310         err = nonseekable_open(inode, file);
1311         if (err < 0)
1312                 return err;
1313
1314         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1315         if (tu == NULL)
1316                 return -ENOMEM;
1317         spin_lock_init(&tu->qlock);
1318         init_waitqueue_head(&tu->qchange_sleep);
1319         mutex_init(&tu->ioctl_lock);
1320         tu->ticks = 1;
1321         tu->queue_size = 128;
1322         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1323                             GFP_KERNEL);
1324         if (tu->queue == NULL) {
1325                 kfree(tu);
1326                 return -ENOMEM;
1327         }
1328         file->private_data = tu;
1329         return 0;
1330 }
1331
1332 static int snd_timer_user_release(struct inode *inode, struct file *file)
1333 {
1334         struct snd_timer_user *tu;
1335
1336         if (file->private_data) {
1337                 tu = file->private_data;
1338                 file->private_data = NULL;
1339                 mutex_lock(&tu->ioctl_lock);
1340                 if (tu->timeri)
1341                         snd_timer_close(tu->timeri);
1342                 mutex_unlock(&tu->ioctl_lock);
1343                 kfree(tu->queue);
1344                 kfree(tu->tqueue);
1345                 kfree(tu);
1346         }
1347         return 0;
1348 }
1349
1350 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1351 {
1352         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1353         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1354         id->card = -1;
1355         id->device = -1;
1356         id->subdevice = -1;
1357 }
1358
1359 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1360 {
1361         id->dev_class = timer->tmr_class;
1362         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1363         id->card = timer->card ? timer->card->number : -1;
1364         id->device = timer->tmr_device;
1365         id->subdevice = timer->tmr_subdevice;
1366 }
1367
1368 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1369 {
1370         struct snd_timer_id id;
1371         struct snd_timer *timer;
1372         struct list_head *p;
1373
1374         if (copy_from_user(&id, _tid, sizeof(id)))
1375                 return -EFAULT;
1376         mutex_lock(&register_mutex);
1377         if (id.dev_class < 0) {         /* first item */
1378                 if (list_empty(&snd_timer_list))
1379                         snd_timer_user_zero_id(&id);
1380                 else {
1381                         timer = list_entry(snd_timer_list.next,
1382                                            struct snd_timer, device_list);
1383                         snd_timer_user_copy_id(&id, timer);
1384                 }
1385         } else {
1386                 switch (id.dev_class) {
1387                 case SNDRV_TIMER_CLASS_GLOBAL:
1388                         id.device = id.device < 0 ? 0 : id.device + 1;
1389                         list_for_each(p, &snd_timer_list) {
1390                                 timer = list_entry(p, struct snd_timer, device_list);
1391                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1392                                         snd_timer_user_copy_id(&id, timer);
1393                                         break;
1394                                 }
1395                                 if (timer->tmr_device >= id.device) {
1396                                         snd_timer_user_copy_id(&id, timer);
1397                                         break;
1398                                 }
1399                         }
1400                         if (p == &snd_timer_list)
1401                                 snd_timer_user_zero_id(&id);
1402                         break;
1403                 case SNDRV_TIMER_CLASS_CARD:
1404                 case SNDRV_TIMER_CLASS_PCM:
1405                         if (id.card < 0) {
1406                                 id.card = 0;
1407                         } else {
1408                                 if (id.card < 0) {
1409                                         id.card = 0;
1410                                 } else {
1411                                         if (id.device < 0) {
1412                                                 id.device = 0;
1413                                         } else {
1414                                                 if (id.subdevice < 0) {
1415                                                         id.subdevice = 0;
1416                                                 } else {
1417                                                         id.subdevice++;
1418                                                 }
1419                                         }
1420                                 }
1421                         }
1422                         list_for_each(p, &snd_timer_list) {
1423                                 timer = list_entry(p, struct snd_timer, device_list);
1424                                 if (timer->tmr_class > id.dev_class) {
1425                                         snd_timer_user_copy_id(&id, timer);
1426                                         break;
1427                                 }
1428                                 if (timer->tmr_class < id.dev_class)
1429                                         continue;
1430                                 if (timer->card->number > id.card) {
1431                                         snd_timer_user_copy_id(&id, timer);
1432                                         break;
1433                                 }
1434                                 if (timer->card->number < id.card)
1435                                         continue;
1436                                 if (timer->tmr_device > id.device) {
1437                                         snd_timer_user_copy_id(&id, timer);
1438                                         break;
1439                                 }
1440                                 if (timer->tmr_device < id.device)
1441                                         continue;
1442                                 if (timer->tmr_subdevice > id.subdevice) {
1443                                         snd_timer_user_copy_id(&id, timer);
1444                                         break;
1445                                 }
1446                                 if (timer->tmr_subdevice < id.subdevice)
1447                                         continue;
1448                                 snd_timer_user_copy_id(&id, timer);
1449                                 break;
1450                         }
1451                         if (p == &snd_timer_list)
1452                                 snd_timer_user_zero_id(&id);
1453                         break;
1454                 default:
1455                         snd_timer_user_zero_id(&id);
1456                 }
1457         }
1458         mutex_unlock(&register_mutex);
1459         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1460                 return -EFAULT;
1461         return 0;
1462 }
1463
1464 static int snd_timer_user_ginfo(struct file *file,
1465                                 struct snd_timer_ginfo __user *_ginfo)
1466 {
1467         struct snd_timer_ginfo *ginfo;
1468         struct snd_timer_id tid;
1469         struct snd_timer *t;
1470         struct list_head *p;
1471         int err = 0;
1472
1473         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1474         if (IS_ERR(ginfo))
1475                 return PTR_ERR(ginfo);
1476
1477         tid = ginfo->tid;
1478         memset(ginfo, 0, sizeof(*ginfo));
1479         ginfo->tid = tid;
1480         mutex_lock(&register_mutex);
1481         t = snd_timer_find(&tid);
1482         if (t != NULL) {
1483                 ginfo->card = t->card ? t->card->number : -1;
1484                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1485                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1486                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1487                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1488                 ginfo->resolution = t->hw.resolution;
1489                 if (t->hw.resolution_min > 0) {
1490                         ginfo->resolution_min = t->hw.resolution_min;
1491                         ginfo->resolution_max = t->hw.resolution_max;
1492                 }
1493                 list_for_each(p, &t->open_list_head) {
1494                         ginfo->clients++;
1495                 }
1496         } else {
1497                 err = -ENODEV;
1498         }
1499         mutex_unlock(&register_mutex);
1500         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1501                 err = -EFAULT;
1502         kfree(ginfo);
1503         return err;
1504 }
1505
1506 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1507 {
1508         struct snd_timer *t;
1509         int err;
1510
1511         mutex_lock(&register_mutex);
1512         t = snd_timer_find(&gparams->tid);
1513         if (!t) {
1514                 err = -ENODEV;
1515                 goto _error;
1516         }
1517         if (!list_empty(&t->open_list_head)) {
1518                 err = -EBUSY;
1519                 goto _error;
1520         }
1521         if (!t->hw.set_period) {
1522                 err = -ENOSYS;
1523                 goto _error;
1524         }
1525         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1526 _error:
1527         mutex_unlock(&register_mutex);
1528         return err;
1529 }
1530
1531 static int snd_timer_user_gparams(struct file *file,
1532                                   struct snd_timer_gparams __user *_gparams)
1533 {
1534         struct snd_timer_gparams gparams;
1535
1536         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1537                 return -EFAULT;
1538         return timer_set_gparams(&gparams);
1539 }
1540
1541 static int snd_timer_user_gstatus(struct file *file,
1542                                   struct snd_timer_gstatus __user *_gstatus)
1543 {
1544         struct snd_timer_gstatus gstatus;
1545         struct snd_timer_id tid;
1546         struct snd_timer *t;
1547         int err = 0;
1548
1549         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1550                 return -EFAULT;
1551         tid = gstatus.tid;
1552         memset(&gstatus, 0, sizeof(gstatus));
1553         gstatus.tid = tid;
1554         mutex_lock(&register_mutex);
1555         t = snd_timer_find(&tid);
1556         if (t != NULL) {
1557                 if (t->hw.c_resolution)
1558                         gstatus.resolution = t->hw.c_resolution(t);
1559                 else
1560                         gstatus.resolution = t->hw.resolution;
1561                 if (t->hw.precise_resolution) {
1562                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1563                                                  &gstatus.resolution_den);
1564                 } else {
1565                         gstatus.resolution_num = gstatus.resolution;
1566                         gstatus.resolution_den = 1000000000uL;
1567                 }
1568         } else {
1569                 err = -ENODEV;
1570         }
1571         mutex_unlock(&register_mutex);
1572         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1573                 err = -EFAULT;
1574         return err;
1575 }
1576
1577 static int snd_timer_user_tselect(struct file *file,
1578                                   struct snd_timer_select __user *_tselect)
1579 {
1580         struct snd_timer_user *tu;
1581         struct snd_timer_select tselect;
1582         char str[32];
1583         int err = 0;
1584
1585         tu = file->private_data;
1586         if (tu->timeri) {
1587                 snd_timer_close(tu->timeri);
1588                 tu->timeri = NULL;
1589         }
1590         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1591                 err = -EFAULT;
1592                 goto __err;
1593         }
1594         sprintf(str, "application %i", current->pid);
1595         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1596                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1597         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1598         if (err < 0)
1599                 goto __err;
1600
1601         kfree(tu->queue);
1602         tu->queue = NULL;
1603         kfree(tu->tqueue);
1604         tu->tqueue = NULL;
1605         if (tu->tread) {
1606                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1607                                      GFP_KERNEL);
1608                 if (tu->tqueue == NULL)
1609                         err = -ENOMEM;
1610         } else {
1611                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1612                                     GFP_KERNEL);
1613                 if (tu->queue == NULL)
1614                         err = -ENOMEM;
1615         }
1616
1617         if (err < 0) {
1618                 snd_timer_close(tu->timeri);
1619                 tu->timeri = NULL;
1620         } else {
1621                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1622                 tu->timeri->callback = tu->tread
1623                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1624                 tu->timeri->ccallback = snd_timer_user_ccallback;
1625                 tu->timeri->callback_data = (void *)tu;
1626                 tu->timeri->disconnect = snd_timer_user_disconnect;
1627         }
1628
1629       __err:
1630         return err;
1631 }
1632
1633 static int snd_timer_user_info(struct file *file,
1634                                struct snd_timer_info __user *_info)
1635 {
1636         struct snd_timer_user *tu;
1637         struct snd_timer_info *info;
1638         struct snd_timer *t;
1639         int err = 0;
1640
1641         tu = file->private_data;
1642         if (!tu->timeri)
1643                 return -EBADFD;
1644         t = tu->timeri->timer;
1645         if (!t)
1646                 return -EBADFD;
1647
1648         info = kzalloc(sizeof(*info), GFP_KERNEL);
1649         if (! info)
1650                 return -ENOMEM;
1651         info->card = t->card ? t->card->number : -1;
1652         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1653                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1654         strlcpy(info->id, t->id, sizeof(info->id));
1655         strlcpy(info->name, t->name, sizeof(info->name));
1656         info->resolution = t->hw.resolution;
1657         if (copy_to_user(_info, info, sizeof(*_info)))
1658                 err = -EFAULT;
1659         kfree(info);
1660         return err;
1661 }
1662
1663 static int snd_timer_user_params(struct file *file,
1664                                  struct snd_timer_params __user *_params)
1665 {
1666         struct snd_timer_user *tu;
1667         struct snd_timer_params params;
1668         struct snd_timer *t;
1669         struct snd_timer_read *tr;
1670         struct snd_timer_tread *ttr;
1671         int err;
1672
1673         tu = file->private_data;
1674         if (!tu->timeri)
1675                 return -EBADFD;
1676         t = tu->timeri->timer;
1677         if (!t)
1678                 return -EBADFD;
1679         if (copy_from_user(&params, _params, sizeof(params)))
1680                 return -EFAULT;
1681         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1682                 err = -EINVAL;
1683                 goto _end;
1684         }
1685         if (params.queue_size > 0 &&
1686             (params.queue_size < 32 || params.queue_size > 1024)) {
1687                 err = -EINVAL;
1688                 goto _end;
1689         }
1690         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1691                               (1<<SNDRV_TIMER_EVENT_TICK)|
1692                               (1<<SNDRV_TIMER_EVENT_START)|
1693                               (1<<SNDRV_TIMER_EVENT_STOP)|
1694                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1695                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1696                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1697                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1698                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1699                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1700                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1701                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1702                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1703                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1704                 err = -EINVAL;
1705                 goto _end;
1706         }
1707         snd_timer_stop(tu->timeri);
1708         spin_lock_irq(&t->lock);
1709         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1710                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1711                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1712         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1713                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1714         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1715                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1716         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1717                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1718         spin_unlock_irq(&t->lock);
1719         if (params.queue_size > 0 &&
1720             (unsigned int)tu->queue_size != params.queue_size) {
1721                 if (tu->tread) {
1722                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1723                                       GFP_KERNEL);
1724                         if (ttr) {
1725                                 kfree(tu->tqueue);
1726                                 tu->queue_size = params.queue_size;
1727                                 tu->tqueue = ttr;
1728                         }
1729                 } else {
1730                         tr = kmalloc(params.queue_size * sizeof(*tr),
1731                                      GFP_KERNEL);
1732                         if (tr) {
1733                                 kfree(tu->queue);
1734                                 tu->queue_size = params.queue_size;
1735                                 tu->queue = tr;
1736                         }
1737                 }
1738         }
1739         tu->qhead = tu->qtail = tu->qused = 0;
1740         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1741                 if (tu->tread) {
1742                         struct snd_timer_tread tread;
1743                         memset(&tread, 0, sizeof(tread));
1744                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1745                         tread.tstamp.tv_sec = 0;
1746                         tread.tstamp.tv_nsec = 0;
1747                         tread.val = 0;
1748                         snd_timer_user_append_to_tqueue(tu, &tread);
1749                 } else {
1750                         struct snd_timer_read *r = &tu->queue[0];
1751                         r->resolution = 0;
1752                         r->ticks = 0;
1753                         tu->qused++;
1754                         tu->qtail++;
1755                 }
1756         }
1757         tu->filter = params.filter;
1758         tu->ticks = params.ticks;
1759         err = 0;
1760  _end:
1761         if (copy_to_user(_params, &params, sizeof(params)))
1762                 return -EFAULT;
1763         return err;
1764 }
1765
1766 static int snd_timer_user_status(struct file *file,
1767                                  struct snd_timer_status __user *_status)
1768 {
1769         struct snd_timer_user *tu;
1770         struct snd_timer_status status;
1771
1772         tu = file->private_data;
1773         if (!tu->timeri)
1774                 return -EBADFD;
1775         memset(&status, 0, sizeof(status));
1776         status.tstamp = tu->tstamp;
1777         status.resolution = snd_timer_resolution(tu->timeri);
1778         status.lost = tu->timeri->lost;
1779         status.overrun = tu->overrun;
1780         spin_lock_irq(&tu->qlock);
1781         status.queue = tu->qused;
1782         spin_unlock_irq(&tu->qlock);
1783         if (copy_to_user(_status, &status, sizeof(status)))
1784                 return -EFAULT;
1785         return 0;
1786 }
1787
1788 static int snd_timer_user_start(struct file *file)
1789 {
1790         int err;
1791         struct snd_timer_user *tu;
1792
1793         tu = file->private_data;
1794         if (!tu->timeri)
1795                 return -EBADFD;
1796         snd_timer_stop(tu->timeri);
1797         tu->timeri->lost = 0;
1798         tu->last_resolution = 0;
1799         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1800 }
1801
1802 static int snd_timer_user_stop(struct file *file)
1803 {
1804         int err;
1805         struct snd_timer_user *tu;
1806
1807         tu = file->private_data;
1808         if (!tu->timeri)
1809                 return -EBADFD;
1810         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1811 }
1812
1813 static int snd_timer_user_continue(struct file *file)
1814 {
1815         int err;
1816         struct snd_timer_user *tu;
1817
1818         tu = file->private_data;
1819         if (!tu->timeri)
1820                 return -EBADFD;
1821         tu->timeri->lost = 0;
1822         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1823 }
1824
1825 static int snd_timer_user_pause(struct file *file)
1826 {
1827         int err;
1828         struct snd_timer_user *tu;
1829
1830         tu = file->private_data;
1831         if (!tu->timeri)
1832                 return -EBADFD;
1833         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1834 }
1835
1836 enum {
1837         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1838         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1839         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1840         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1841 };
1842
1843 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1844                                  unsigned long arg)
1845 {
1846         struct snd_timer_user *tu;
1847         void __user *argp = (void __user *)arg;
1848         int __user *p = argp;
1849
1850         tu = file->private_data;
1851         switch (cmd) {
1852         case SNDRV_TIMER_IOCTL_PVERSION:
1853                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1854         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1855                 return snd_timer_user_next_device(argp);
1856         case SNDRV_TIMER_IOCTL_TREAD:
1857         {
1858                 int xarg;
1859
1860                 if (tu->timeri) /* too late */
1861                         return -EBUSY;
1862                 if (get_user(xarg, p))
1863                         return -EFAULT;
1864                 tu->tread = xarg ? 1 : 0;
1865                 return 0;
1866         }
1867         case SNDRV_TIMER_IOCTL_GINFO:
1868                 return snd_timer_user_ginfo(file, argp);
1869         case SNDRV_TIMER_IOCTL_GPARAMS:
1870                 return snd_timer_user_gparams(file, argp);
1871         case SNDRV_TIMER_IOCTL_GSTATUS:
1872                 return snd_timer_user_gstatus(file, argp);
1873         case SNDRV_TIMER_IOCTL_SELECT:
1874                 return snd_timer_user_tselect(file, argp);
1875         case SNDRV_TIMER_IOCTL_INFO:
1876                 return snd_timer_user_info(file, argp);
1877         case SNDRV_TIMER_IOCTL_PARAMS:
1878                 return snd_timer_user_params(file, argp);
1879         case SNDRV_TIMER_IOCTL_STATUS:
1880                 return snd_timer_user_status(file, argp);
1881         case SNDRV_TIMER_IOCTL_START:
1882         case SNDRV_TIMER_IOCTL_START_OLD:
1883                 return snd_timer_user_start(file);
1884         case SNDRV_TIMER_IOCTL_STOP:
1885         case SNDRV_TIMER_IOCTL_STOP_OLD:
1886                 return snd_timer_user_stop(file);
1887         case SNDRV_TIMER_IOCTL_CONTINUE:
1888         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1889                 return snd_timer_user_continue(file);
1890         case SNDRV_TIMER_IOCTL_PAUSE:
1891         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1892                 return snd_timer_user_pause(file);
1893         }
1894         return -ENOTTY;
1895 }
1896
1897 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1898                                  unsigned long arg)
1899 {
1900         struct snd_timer_user *tu = file->private_data;
1901         long ret;
1902
1903         mutex_lock(&tu->ioctl_lock);
1904         ret = __snd_timer_user_ioctl(file, cmd, arg);
1905         mutex_unlock(&tu->ioctl_lock);
1906         return ret;
1907 }
1908
1909 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1910 {
1911         struct snd_timer_user *tu;
1912
1913         tu = file->private_data;
1914         return fasync_helper(fd, file, on, &tu->fasync);
1915 }
1916
1917 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1918                                    size_t count, loff_t *offset)
1919 {
1920         struct snd_timer_user *tu;
1921         long result = 0, unit;
1922         int qhead;
1923         int err = 0;
1924
1925         tu = file->private_data;
1926         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1927         spin_lock_irq(&tu->qlock);
1928         while ((long)count - result >= unit) {
1929                 while (!tu->qused) {
1930                         wait_queue_t wait;
1931
1932                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1933                                 err = -EAGAIN;
1934                                 goto _error;
1935                         }
1936
1937                         set_current_state(TASK_INTERRUPTIBLE);
1938                         init_waitqueue_entry(&wait, current);
1939                         add_wait_queue(&tu->qchange_sleep, &wait);
1940
1941                         spin_unlock_irq(&tu->qlock);
1942                         schedule();
1943                         spin_lock_irq(&tu->qlock);
1944
1945                         remove_wait_queue(&tu->qchange_sleep, &wait);
1946
1947                         if (tu->disconnected) {
1948                                 err = -ENODEV;
1949                                 goto _error;
1950                         }
1951                         if (signal_pending(current)) {
1952                                 err = -ERESTARTSYS;
1953                                 goto _error;
1954                         }
1955                 }
1956
1957                 qhead = tu->qhead++;
1958                 tu->qhead %= tu->queue_size;
1959                 tu->qused--;
1960                 spin_unlock_irq(&tu->qlock);
1961
1962                 if (tu->tread) {
1963                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1964                                          sizeof(struct snd_timer_tread)))
1965                                 err = -EFAULT;
1966                 } else {
1967                         if (copy_to_user(buffer, &tu->queue[qhead],
1968                                          sizeof(struct snd_timer_read)))
1969                                 err = -EFAULT;
1970                 }
1971
1972                 spin_lock_irq(&tu->qlock);
1973                 if (err < 0)
1974                         goto _error;
1975                 result += unit;
1976                 buffer += unit;
1977         }
1978  _error:
1979         spin_unlock_irq(&tu->qlock);
1980         return result > 0 ? result : err;
1981 }
1982
1983 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1984 {
1985         unsigned int mask;
1986         struct snd_timer_user *tu;
1987
1988         tu = file->private_data;
1989
1990         poll_wait(file, &tu->qchange_sleep, wait);
1991
1992         mask = 0;
1993         if (tu->qused)
1994                 mask |= POLLIN | POLLRDNORM;
1995         if (tu->disconnected)
1996                 mask |= POLLERR;
1997
1998         return mask;
1999 }
2000
2001 #ifdef CONFIG_COMPAT
2002 #include "timer_compat.c"
2003 #else
2004 #define snd_timer_user_ioctl_compat     NULL
2005 #endif
2006
2007 static const struct file_operations snd_timer_f_ops =
2008 {
2009         .owner =        THIS_MODULE,
2010         .read =         snd_timer_user_read,
2011         .open =         snd_timer_user_open,
2012         .release =      snd_timer_user_release,
2013         .llseek =       no_llseek,
2014         .poll =         snd_timer_user_poll,
2015         .unlocked_ioctl =       snd_timer_user_ioctl,
2016         .compat_ioctl = snd_timer_user_ioctl_compat,
2017         .fasync =       snd_timer_user_fasync,
2018 };
2019
2020 /* unregister the system timer */
2021 static void snd_timer_free_all(void)
2022 {
2023         struct snd_timer *timer, *n;
2024
2025         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2026                 snd_timer_free(timer);
2027 }
2028
2029 static struct device timer_dev;
2030
2031 /*
2032  *  ENTRY functions
2033  */
2034
2035 static int __init alsa_timer_init(void)
2036 {
2037         int err;
2038
2039         snd_device_initialize(&timer_dev, NULL);
2040         dev_set_name(&timer_dev, "timer");
2041
2042 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2043         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2044                               "system timer");
2045 #endif
2046
2047         err = snd_timer_register_system();
2048         if (err < 0) {
2049                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2050                 put_device(&timer_dev);
2051                 return err;
2052         }
2053
2054         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2055                                   &snd_timer_f_ops, NULL, &timer_dev);
2056         if (err < 0) {
2057                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2058                 snd_timer_free_all();
2059                 put_device(&timer_dev);
2060                 return err;
2061         }
2062
2063         snd_timer_proc_init();
2064         return 0;
2065 }
2066
2067 static void __exit alsa_timer_exit(void)
2068 {
2069         snd_unregister_device(&timer_dev);
2070         snd_timer_free_all();
2071         put_device(&timer_dev);
2072         snd_timer_proc_done();
2073 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2074         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2075 #endif
2076 }
2077
2078 module_init(alsa_timer_init)
2079 module_exit(alsa_timer_exit)
2080
2081 EXPORT_SYMBOL(snd_timer_open);
2082 EXPORT_SYMBOL(snd_timer_close);
2083 EXPORT_SYMBOL(snd_timer_resolution);
2084 EXPORT_SYMBOL(snd_timer_start);
2085 EXPORT_SYMBOL(snd_timer_stop);
2086 EXPORT_SYMBOL(snd_timer_continue);
2087 EXPORT_SYMBOL(snd_timer_pause);
2088 EXPORT_SYMBOL(snd_timer_new);
2089 EXPORT_SYMBOL(snd_timer_notify);
2090 EXPORT_SYMBOL(snd_timer_global_new);
2091 EXPORT_SYMBOL(snd_timer_global_free);
2092 EXPORT_SYMBOL(snd_timer_global_register);
2093 EXPORT_SYMBOL(snd_timer_interrupt);