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         INIT_LIST_HEAD(&timer->device_list);
 817         INIT_LIST_HEAD(&timer->open_list_head);
 818         INIT_LIST_HEAD(&timer->active_list_head);
 819         INIT_LIST_HEAD(&timer->ack_list_head);
 820         INIT_LIST_HEAD(&timer->sack_list_head);
 821         spin_lock_init(&timer->lock);
 822         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 823                      (unsigned long)timer);
 824         if (card != NULL) {
 825                 timer->module = card->module;
 826                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 827                 if (err < 0) {
 828                         snd_timer_free(timer);
 829                         return err;
 830                 }
 831         }
 832         if (rtimer)
 833                 *rtimer = timer;
 834         return 0;
 835 }
 836
 837 static int snd_timer_free(struct snd_timer *timer)
 838 {
 839         if (!timer)
 840                 return 0;
 841
 842         mutex_lock(&register_mutex);
 843         if (! list_empty(&timer->open_list_head)) {
 844                 struct list_head *p, *n;
 845                 struct snd_timer_instance *ti;
 846                 pr_warn("ALSA: timer %p is busy?\n", timer);
 847                 list_for_each_safe(p, n, &timer->open_list_head) {
 848                         list_del_init(p);
 849                         ti = list_entry(p, struct snd_timer_instance, open_list);
 850                         ti->timer = NULL;
 851                 }
 852         }
 853         list_del(&timer->device_list);
 854         mutex_unlock(&register_mutex);
 855
 856         if (timer->private_free)
 857                 timer->private_free(timer);
 858         kfree(timer);
 859         return 0;
 860 }
 861
 862 static int snd_timer_dev_free(struct snd_device *device)
 863 {
 864         struct snd_timer *timer = device->device_data;
 865         return snd_timer_free(timer);
 866 }
 867
 868 static int snd_timer_dev_register(struct snd_device *dev)
 869 {
 870         struct snd_timer *timer = dev->device_data;
 871         struct snd_timer *timer1;
 872
 873         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 874                 return -ENXIO;
 875         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 876             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 877                 return -EINVAL;
 878
 879         mutex_lock(&register_mutex);
 880         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 881                 if (timer1->tmr_class > timer->tmr_class)
 882                         break;
 883                 if (timer1->tmr_class < timer->tmr_class)
 884                         continue;
 885                 if (timer1->card && timer->card) {
 886                         if (timer1->card->number > timer->card->number)
 887                                 break;
 888                         if (timer1->card->number < timer->card->number)
 889                                 continue;
 890                 }
 891                 if (timer1->tmr_device > timer->tmr_device)
 892                         break;
 893                 if (timer1->tmr_device < timer->tmr_device)
 894                         continue;
 895                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 896                         break;
 897                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 898                         continue;
 899                 /* conflicts.. */
 900                 mutex_unlock(&register_mutex);
 901                 return -EBUSY;
 902         }
 903         list_add_tail(&timer->device_list, &timer1->device_list);
 904         mutex_unlock(&register_mutex);
 905         return 0;
 906 }
 907
 908 static int snd_timer_dev_disconnect(struct snd_device *device)
 909 {
 910         struct snd_timer *timer = device->device_data;
 911         struct snd_timer_instance *ti;
 912
 913         mutex_lock(&register_mutex);
 914         list_del_init(&timer->device_list);
 915         /* wake up pending sleepers */
 916         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 917                 if (ti->disconnect)
 918                         ti->disconnect(ti);
 919         }
 920         mutex_unlock(&register_mutex);
 921         return 0;
 922 }
 923
 924 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 925 {
 926         unsigned long flags;
 927         unsigned long resolution = 0;
 928         struct snd_timer_instance *ti, *ts;
 929
 930         if (timer->card && timer->card->shutdown)
 931                 return;
 932         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 933                 return;
 934         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 935                        event > SNDRV_TIMER_EVENT_MRESUME))
 936                 return;
 937         spin_lock_irqsave(&timer->lock, flags);
 938         if (event == SNDRV_TIMER_EVENT_MSTART ||
 939             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 940             event == SNDRV_TIMER_EVENT_MRESUME) {
 941                 if (timer->hw.c_resolution)
 942                         resolution = timer->hw.c_resolution(timer);
 943                 else
 944                         resolution = timer->hw.resolution;
 945         }
 946         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 947                 if (ti->ccallback)
 948                         ti->ccallback(ti, event, tstamp, resolution);
 949                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 950                         if (ts->ccallback)
 951                                 ts->ccallback(ts, event, tstamp, resolution);
 952         }
 953         spin_unlock_irqrestore(&timer->lock, flags);
 954 }
 955
 956 /*
 957  * exported functions for global timers
 958  */
 959 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 960 {
 961         struct snd_timer_id tid;
 962
 963         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 964         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 965         tid.card = -1;
 966         tid.device = device;
 967         tid.subdevice = 0;
 968         return snd_timer_new(NULL, id, &tid, rtimer);
 969 }
 970
 971 int snd_timer_global_free(struct snd_timer *timer)
 972 {
 973         return snd_timer_free(timer);
 974 }
 975
 976 int snd_timer_global_register(struct snd_timer *timer)
 977 {
 978         struct snd_device dev;
 979
 980         memset(&dev, 0, sizeof(dev));
 981         dev.device_data = timer;
 982         return snd_timer_dev_register(&dev);
 983 }
 984
 985 /*
 986  *  System timer
 987  */
 988
 989 struct snd_timer_system_private {
 990         struct timer_list tlist;
 991         unsigned long last_expires;
 992         unsigned long last_jiffies;
 993         unsigned long correction;
 994 };
 995
 996 static void snd_timer_s_function(unsigned long data)
 997 {
 998         struct snd_timer *timer = (struct snd_timer *)data;
 999         struct snd_timer_system_private *priv = timer->private_data;
1000         unsigned long jiff = jiffies;
1001         if (time_after(jiff, priv->last_expires))
1002                 priv->correction += (long)jiff - (long)priv->last_expires;
1003         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1004 }
1005
1006 static int snd_timer_s_start(struct snd_timer * timer)
1007 {
1008         struct snd_timer_system_private *priv;
1009         unsigned long njiff;
1010
1011         priv = (struct snd_timer_system_private *) timer->private_data;
1012         njiff = (priv->last_jiffies = jiffies);
1013         if (priv->correction > timer->sticks - 1) {
1014                 priv->correction -= timer->sticks - 1;
1015                 njiff++;
1016         } else {
1017                 njiff += timer->sticks - priv->correction;
1018                 priv->correction = 0;
1019         }
1020         priv->last_expires = njiff;
1021         mod_timer(&priv->tlist, njiff);
1022         return 0;
1023 }
1024
1025 static int snd_timer_s_stop(struct snd_timer * timer)
1026 {
1027         struct snd_timer_system_private *priv;
1028         unsigned long jiff;
1029
1030         priv = (struct snd_timer_system_private *) timer->private_data;
1031         del_timer(&priv->tlist);
1032         jiff = jiffies;
1033         if (time_before(jiff, priv->last_expires))
1034                 timer->sticks = priv->last_expires - jiff;
1035         else
1036                 timer->sticks = 1;
1037         priv->correction = 0;
1038         return 0;
1039 }
1040
1041 static int snd_timer_s_close(struct snd_timer *timer)
1042 {
1043         struct snd_timer_system_private *priv;
1044
1045         priv = (struct snd_timer_system_private *)timer->private_data;
1046         del_timer_sync(&priv->tlist);
1047         return 0;
1048 }
1049
1050 static struct snd_timer_hardware snd_timer_system =
1051 {
1052         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1053         .resolution =   1000000000L / HZ,
1054         .ticks =        10000000L,
1055         .close =        snd_timer_s_close,
1056         .start =        snd_timer_s_start,
1057         .stop =         snd_timer_s_stop
1058 };
1059
1060 static void snd_timer_free_system(struct snd_timer *timer)
1061 {
1062         kfree(timer->private_data);
1063 }
1064
1065 static int snd_timer_register_system(void)
1066 {
1067         struct snd_timer *timer;
1068         struct snd_timer_system_private *priv;
1069         int err;
1070
1071         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1072         if (err < 0)
1073                 return err;
1074         strcpy(timer->name, "system timer");
1075         timer->hw = snd_timer_system;
1076         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1077         if (priv == NULL) {
1078                 snd_timer_free(timer);
1079                 return -ENOMEM;
1080         }
1081         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1082         timer->private_data = priv;
1083         timer->private_free = snd_timer_free_system;
1084         return snd_timer_global_register(timer);
1085 }
1086
1087 #ifdef CONFIG_SND_PROC_FS
1088 /*
1089  *  Info interface
1090  */
1091
1092 static void snd_timer_proc_read(struct snd_info_entry *entry,
1093                                 struct snd_info_buffer *buffer)
1094 {
1095         struct snd_timer *timer;
1096         struct snd_timer_instance *ti;
1097
1098         mutex_lock(&register_mutex);
1099         list_for_each_entry(timer, &snd_timer_list, device_list) {
1100                 if (timer->card && timer->card->shutdown)
1101                         continue;
1102                 switch (timer->tmr_class) {
1103                 case SNDRV_TIMER_CLASS_GLOBAL:
1104                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1105                         break;
1106                 case SNDRV_TIMER_CLASS_CARD:
1107                         snd_iprintf(buffer, "C%i-%i: ",
1108                                     timer->card->number, timer->tmr_device);
1109                         break;
1110                 case SNDRV_TIMER_CLASS_PCM:
1111                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1112                                     timer->tmr_device, timer->tmr_subdevice);
1113                         break;
1114                 default:
1115                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1116                                     timer->card ? timer->card->number : -1,
1117                                     timer->tmr_device, timer->tmr_subdevice);
1118                 }
1119                 snd_iprintf(buffer, "%s :", timer->name);
1120                 if (timer->hw.resolution)
1121                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1122                                     timer->hw.resolution / 1000,
1123                                     timer->hw.resolution % 1000,
1124                                     timer->hw.ticks);
1125                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1126                         snd_iprintf(buffer, " SLAVE");
1127                 snd_iprintf(buffer, "\n");
1128                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1129                         snd_iprintf(buffer, "  Client %s : %s\n",
1130                                     ti->owner ? ti->owner : "unknown",
1131                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1132                                                  SNDRV_TIMER_IFLG_RUNNING)
1133                                     ? "running" : "stopped");
1134         }
1135         mutex_unlock(&register_mutex);
1136 }
1137
1138 static struct snd_info_entry *snd_timer_proc_entry;
1139
1140 static void __init snd_timer_proc_init(void)
1141 {
1142         struct snd_info_entry *entry;
1143
1144         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1145         if (entry != NULL) {
1146                 entry->c.text.read = snd_timer_proc_read;
1147                 if (snd_info_register(entry) < 0) {
1148                         snd_info_free_entry(entry);
1149                         entry = NULL;
1150                 }
1151         }
1152         snd_timer_proc_entry = entry;
1153 }
1154
1155 static void __exit snd_timer_proc_done(void)
1156 {
1157         snd_info_free_entry(snd_timer_proc_entry);
1158 }
1159 #else /* !CONFIG_SND_PROC_FS */
1160 #define snd_timer_proc_init()
1161 #define snd_timer_proc_done()
1162 #endif
1163
1164 /*
1165  *  USER SPACE interface
1166  */
1167
1168 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1169                                      unsigned long resolution,
1170                                      unsigned long ticks)
1171 {
1172         struct snd_timer_user *tu = timeri->callback_data;
1173         struct snd_timer_read *r;
1174         int prev;
1175
1176         spin_lock(&tu->qlock);
1177         if (tu->qused > 0) {
1178                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1179                 r = &tu->queue[prev];
1180                 if (r->resolution == resolution) {
1181                         r->ticks += ticks;
1182                         goto __wake;
1183                 }
1184         }
1185         if (tu->qused >= tu->queue_size) {
1186                 tu->overrun++;
1187         } else {
1188                 r = &tu->queue[tu->qtail++];
1189                 tu->qtail %= tu->queue_size;
1190                 r->resolution = resolution;
1191                 r->ticks = ticks;
1192                 tu->qused++;
1193         }
1194       __wake:
1195         spin_unlock(&tu->qlock);
1196         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1197         wake_up(&tu->qchange_sleep);
1198 }
1199
1200 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1201                                             struct snd_timer_tread *tread)
1202 {
1203         if (tu->qused >= tu->queue_size) {
1204                 tu->overrun++;
1205         } else {
1206                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1207                 tu->qtail %= tu->queue_size;
1208                 tu->qused++;
1209         }
1210 }
1211
1212 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1213                                      int event,
1214                                      struct timespec *tstamp,
1215                                      unsigned long resolution)
1216 {
1217         struct snd_timer_user *tu = timeri->callback_data;
1218         struct snd_timer_tread r1;
1219         unsigned long flags;
1220
1221         if (event >= SNDRV_TIMER_EVENT_START &&
1222             event <= SNDRV_TIMER_EVENT_PAUSE)
1223                 tu->tstamp = *tstamp;
1224         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1225                 return;
1226         memset(&r1, 0, sizeof(r1));
1227         r1.event = event;
1228         r1.tstamp = *tstamp;
1229         r1.val = resolution;
1230         spin_lock_irqsave(&tu->qlock, flags);
1231         snd_timer_user_append_to_tqueue(tu, &r1);
1232         spin_unlock_irqrestore(&tu->qlock, flags);
1233         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1234         wake_up(&tu->qchange_sleep);
1235 }
1236
1237 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1238 {
1239         struct snd_timer_user *tu = timeri->callback_data;
1240
1241         tu->disconnected = true;
1242         wake_up(&tu->qchange_sleep);
1243 }
1244
1245 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1246                                       unsigned long resolution,
1247                                       unsigned long ticks)
1248 {
1249         struct snd_timer_user *tu = timeri->callback_data;
1250         struct snd_timer_tread *r, r1;
1251         struct timespec tstamp;
1252         int prev, append = 0;
1253
1254         memset(&tstamp, 0, sizeof(tstamp));
1255         spin_lock(&tu->qlock);
1256         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1257                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1258                 spin_unlock(&tu->qlock);
1259                 return;
1260         }
1261         if (tu->last_resolution != resolution || ticks > 0) {
1262                 if (timer_tstamp_monotonic)
1263                         ktime_get_ts(&tstamp);
1264                 else
1265                         getnstimeofday(&tstamp);
1266         }
1267         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1268             tu->last_resolution != resolution) {
1269                 memset(&r1, 0, sizeof(r1));
1270                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1271                 r1.tstamp = tstamp;
1272                 r1.val = resolution;
1273                 snd_timer_user_append_to_tqueue(tu, &r1);
1274                 tu->last_resolution = resolution;
1275                 append++;
1276         }
1277         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1278                 goto __wake;
1279         if (ticks == 0)
1280                 goto __wake;
1281         if (tu->qused > 0) {
1282                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1283                 r = &tu->tqueue[prev];
1284                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1285                         r->tstamp = tstamp;
1286                         r->val += ticks;
1287                         append++;
1288                         goto __wake;
1289                 }
1290         }
1291         r1.event = SNDRV_TIMER_EVENT_TICK;
1292         r1.tstamp = tstamp;
1293         r1.val = ticks;
1294         snd_timer_user_append_to_tqueue(tu, &r1);
1295         append++;
1296       __wake:
1297         spin_unlock(&tu->qlock);
1298         if (append == 0)
1299                 return;
1300         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1301         wake_up(&tu->qchange_sleep);
1302 }
1303
1304 static int snd_timer_user_open(struct inode *inode, struct file *file)
1305 {
1306         struct snd_timer_user *tu;
1307         int err;
1308
1309         err = nonseekable_open(inode, file);
1310         if (err < 0)
1311                 return err;
1312
1313         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1314         if (tu == NULL)
1315                 return -ENOMEM;
1316         spin_lock_init(&tu->qlock);
1317         init_waitqueue_head(&tu->qchange_sleep);
1318         mutex_init(&tu->ioctl_lock);
1319         tu->ticks = 1;
1320         tu->queue_size = 128;
1321         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1322                             GFP_KERNEL);
1323         if (tu->queue == NULL) {
1324                 kfree(tu);
1325                 return -ENOMEM;
1326         }
1327         file->private_data = tu;
1328         return 0;
1329 }
1330
1331 static int snd_timer_user_release(struct inode *inode, struct file *file)
1332 {
1333         struct snd_timer_user *tu;
1334
1335         if (file->private_data) {
1336                 tu = file->private_data;
1337                 file->private_data = NULL;
1338                 mutex_lock(&tu->ioctl_lock);
1339                 if (tu->timeri)
1340                         snd_timer_close(tu->timeri);
1341                 mutex_unlock(&tu->ioctl_lock);
1342                 kfree(tu->queue);
1343                 kfree(tu->tqueue);
1344                 kfree(tu);
1345         }
1346         return 0;
1347 }
1348
1349 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1350 {
1351         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1352         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1353         id->card = -1;
1354         id->device = -1;
1355         id->subdevice = -1;
1356 }
1357
1358 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1359 {
1360         id->dev_class = timer->tmr_class;
1361         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1362         id->card = timer->card ? timer->card->number : -1;
1363         id->device = timer->tmr_device;
1364         id->subdevice = timer->tmr_subdevice;
1365 }
1366
1367 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1368 {
1369         struct snd_timer_id id;
1370         struct snd_timer *timer;
1371         struct list_head *p;
1372
1373         if (copy_from_user(&id, _tid, sizeof(id)))
1374                 return -EFAULT;
1375         mutex_lock(&register_mutex);
1376         if (id.dev_class < 0) {         /* first item */
1377                 if (list_empty(&snd_timer_list))
1378                         snd_timer_user_zero_id(&id);
1379                 else {
1380                         timer = list_entry(snd_timer_list.next,
1381                                            struct snd_timer, device_list);
1382                         snd_timer_user_copy_id(&id, timer);
1383                 }
1384         } else {
1385                 switch (id.dev_class) {
1386                 case SNDRV_TIMER_CLASS_GLOBAL:
1387                         id.device = id.device < 0 ? 0 : id.device + 1;
1388                         list_for_each(p, &snd_timer_list) {
1389                                 timer = list_entry(p, struct snd_timer, device_list);
1390                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1391                                         snd_timer_user_copy_id(&id, timer);
1392                                         break;
1393                                 }
1394                                 if (timer->tmr_device >= id.device) {
1395                                         snd_timer_user_copy_id(&id, timer);
1396                                         break;
1397                                 }
1398                         }
1399                         if (p == &snd_timer_list)
1400                                 snd_timer_user_zero_id(&id);
1401                         break;
1402                 case SNDRV_TIMER_CLASS_CARD:
1403                 case SNDRV_TIMER_CLASS_PCM:
1404                         if (id.card < 0) {
1405                                 id.card = 0;
1406                         } else {
1407                                 if (id.card < 0) {
1408                                         id.card = 0;
1409                                 } else {
1410                                         if (id.device < 0) {
1411                                                 id.device = 0;
1412                                         } else {
1413                                                 if (id.subdevice < 0) {
1414                                                         id.subdevice = 0;
1415                                                 } else {
1416                                                         id.subdevice++;
1417                                                 }
1418                                         }
1419                                 }
1420                         }
1421                         list_for_each(p, &snd_timer_list) {
1422                                 timer = list_entry(p, struct snd_timer, device_list);
1423                                 if (timer->tmr_class > id.dev_class) {
1424                                         snd_timer_user_copy_id(&id, timer);
1425                                         break;
1426                                 }
1427                                 if (timer->tmr_class < id.dev_class)
1428                                         continue;
1429                                 if (timer->card->number > id.card) {
1430                                         snd_timer_user_copy_id(&id, timer);
1431                                         break;
1432                                 }
1433                                 if (timer->card->number < id.card)
1434                                         continue;
1435                                 if (timer->tmr_device > id.device) {
1436                                         snd_timer_user_copy_id(&id, timer);
1437                                         break;
1438                                 }
1439                                 if (timer->tmr_device < id.device)
1440                                         continue;
1441                                 if (timer->tmr_subdevice > id.subdevice) {
1442                                         snd_timer_user_copy_id(&id, timer);
1443                                         break;
1444                                 }
1445                                 if (timer->tmr_subdevice < id.subdevice)
1446                                         continue;
1447                                 snd_timer_user_copy_id(&id, timer);
1448                                 break;
1449                         }
1450                         if (p == &snd_timer_list)
1451                                 snd_timer_user_zero_id(&id);
1452                         break;
1453                 default:
1454                         snd_timer_user_zero_id(&id);
1455                 }
1456         }
1457         mutex_unlock(&register_mutex);
1458         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1459                 return -EFAULT;
1460         return 0;
1461 }
1462
1463 static int snd_timer_user_ginfo(struct file *file,
1464                                 struct snd_timer_ginfo __user *_ginfo)
1465 {
1466         struct snd_timer_ginfo *ginfo;
1467         struct snd_timer_id tid;
1468         struct snd_timer *t;
1469         struct list_head *p;
1470         int err = 0;
1471
1472         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1473         if (IS_ERR(ginfo))
1474                 return PTR_ERR(ginfo);
1475
1476         tid = ginfo->tid;
1477         memset(ginfo, 0, sizeof(*ginfo));
1478         ginfo->tid = tid;
1479         mutex_lock(&register_mutex);
1480         t = snd_timer_find(&tid);
1481         if (t != NULL) {
1482                 ginfo->card = t->card ? t->card->number : -1;
1483                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1484                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1485                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1486                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1487                 ginfo->resolution = t->hw.resolution;
1488                 if (t->hw.resolution_min > 0) {
1489                         ginfo->resolution_min = t->hw.resolution_min;
1490                         ginfo->resolution_max = t->hw.resolution_max;
1491                 }
1492                 list_for_each(p, &t->open_list_head) {
1493                         ginfo->clients++;
1494                 }
1495         } else {
1496                 err = -ENODEV;
1497         }
1498         mutex_unlock(&register_mutex);
1499         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1500                 err = -EFAULT;
1501         kfree(ginfo);
1502         return err;
1503 }
1504
1505 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1506 {
1507         struct snd_timer *t;
1508         int err;
1509
1510         mutex_lock(&register_mutex);
1511         t = snd_timer_find(&gparams->tid);
1512         if (!t) {
1513                 err = -ENODEV;
1514                 goto _error;
1515         }
1516         if (!list_empty(&t->open_list_head)) {
1517                 err = -EBUSY;
1518                 goto _error;
1519         }
1520         if (!t->hw.set_period) {
1521                 err = -ENOSYS;
1522                 goto _error;
1523         }
1524         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1525 _error:
1526         mutex_unlock(&register_mutex);
1527         return err;
1528 }
1529
1530 static int snd_timer_user_gparams(struct file *file,
1531                                   struct snd_timer_gparams __user *_gparams)
1532 {
1533         struct snd_timer_gparams gparams;
1534
1535         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1536                 return -EFAULT;
1537         return timer_set_gparams(&gparams);
1538 }
1539
1540 static int snd_timer_user_gstatus(struct file *file,
1541                                   struct snd_timer_gstatus __user *_gstatus)
1542 {
1543         struct snd_timer_gstatus gstatus;
1544         struct snd_timer_id tid;
1545         struct snd_timer *t;
1546         int err = 0;
1547
1548         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1549                 return -EFAULT;
1550         tid = gstatus.tid;
1551         memset(&gstatus, 0, sizeof(gstatus));
1552         gstatus.tid = tid;
1553         mutex_lock(&register_mutex);
1554         t = snd_timer_find(&tid);
1555         if (t != NULL) {
1556                 if (t->hw.c_resolution)
1557                         gstatus.resolution = t->hw.c_resolution(t);
1558                 else
1559                         gstatus.resolution = t->hw.resolution;
1560                 if (t->hw.precise_resolution) {
1561                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1562                                                  &gstatus.resolution_den);
1563                 } else {
1564                         gstatus.resolution_num = gstatus.resolution;
1565                         gstatus.resolution_den = 1000000000uL;
1566                 }
1567         } else {
1568                 err = -ENODEV;
1569         }
1570         mutex_unlock(&register_mutex);
1571         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1572                 err = -EFAULT;
1573         return err;
1574 }
1575
1576 static int snd_timer_user_tselect(struct file *file,
1577                                   struct snd_timer_select __user *_tselect)
1578 {
1579         struct snd_timer_user *tu;
1580         struct snd_timer_select tselect;
1581         char str[32];
1582         int err = 0;
1583
1584         tu = file->private_data;
1585         if (tu->timeri) {
1586                 snd_timer_close(tu->timeri);
1587                 tu->timeri = NULL;
1588         }
1589         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1590                 err = -EFAULT;
1591                 goto __err;
1592         }
1593         sprintf(str, "application %i", current->pid);
1594         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1595                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1596         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1597         if (err < 0)
1598                 goto __err;
1599
1600         kfree(tu->queue);
1601         tu->queue = NULL;
1602         kfree(tu->tqueue);
1603         tu->tqueue = NULL;
1604         if (tu->tread) {
1605                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1606                                      GFP_KERNEL);
1607                 if (tu->tqueue == NULL)
1608                         err = -ENOMEM;
1609         } else {
1610                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1611                                     GFP_KERNEL);
1612                 if (tu->queue == NULL)
1613                         err = -ENOMEM;
1614         }
1615
1616         if (err < 0) {
1617                 snd_timer_close(tu->timeri);
1618                 tu->timeri = NULL;
1619         } else {
1620                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1621                 tu->timeri->callback = tu->tread
1622                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1623                 tu->timeri->ccallback = snd_timer_user_ccallback;
1624                 tu->timeri->callback_data = (void *)tu;
1625                 tu->timeri->disconnect = snd_timer_user_disconnect;
1626         }
1627
1628       __err:
1629         return err;
1630 }
1631
1632 static int snd_timer_user_info(struct file *file,
1633                                struct snd_timer_info __user *_info)
1634 {
1635         struct snd_timer_user *tu;
1636         struct snd_timer_info *info;
1637         struct snd_timer *t;
1638         int err = 0;
1639
1640         tu = file->private_data;
1641         if (!tu->timeri)
1642                 return -EBADFD;
1643         t = tu->timeri->timer;
1644         if (!t)
1645                 return -EBADFD;
1646
1647         info = kzalloc(sizeof(*info), GFP_KERNEL);
1648         if (! info)
1649                 return -ENOMEM;
1650         info->card = t->card ? t->card->number : -1;
1651         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1652                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1653         strlcpy(info->id, t->id, sizeof(info->id));
1654         strlcpy(info->name, t->name, sizeof(info->name));
1655         info->resolution = t->hw.resolution;
1656         if (copy_to_user(_info, info, sizeof(*_info)))
1657                 err = -EFAULT;
1658         kfree(info);
1659         return err;
1660 }
1661
1662 static int snd_timer_user_params(struct file *file,
1663                                  struct snd_timer_params __user *_params)
1664 {
1665         struct snd_timer_user *tu;
1666         struct snd_timer_params params;
1667         struct snd_timer *t;
1668         struct snd_timer_read *tr;
1669         struct snd_timer_tread *ttr;
1670         int err;
1671
1672         tu = file->private_data;
1673         if (!tu->timeri)
1674                 return -EBADFD;
1675         t = tu->timeri->timer;
1676         if (!t)
1677                 return -EBADFD;
1678         if (copy_from_user(&params, _params, sizeof(params)))
1679                 return -EFAULT;
1680         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1681                 err = -EINVAL;
1682                 goto _end;
1683         }
1684         if (params.queue_size > 0 &&
1685             (params.queue_size < 32 || params.queue_size > 1024)) {
1686                 err = -EINVAL;
1687                 goto _end;
1688         }
1689         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1690                               (1<<SNDRV_TIMER_EVENT_TICK)|
1691                               (1<<SNDRV_TIMER_EVENT_START)|
1692                               (1<<SNDRV_TIMER_EVENT_STOP)|
1693                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1694                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1695                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1696                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1697                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1698                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1699                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1700                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1701                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1702                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1703                 err = -EINVAL;
1704                 goto _end;
1705         }
1706         snd_timer_stop(tu->timeri);
1707         spin_lock_irq(&t->lock);
1708         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1709                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1710                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1711         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1712                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1713         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1714                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1715         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1716                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1717         spin_unlock_irq(&t->lock);
1718         if (params.queue_size > 0 &&
1719             (unsigned int)tu->queue_size != params.queue_size) {
1720                 if (tu->tread) {
1721                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1722                                       GFP_KERNEL);
1723                         if (ttr) {
1724                                 kfree(tu->tqueue);
1725                                 tu->queue_size = params.queue_size;
1726                                 tu->tqueue = ttr;
1727                         }
1728                 } else {
1729                         tr = kmalloc(params.queue_size * sizeof(*tr),
1730                                      GFP_KERNEL);
1731                         if (tr) {
1732                                 kfree(tu->queue);
1733                                 tu->queue_size = params.queue_size;
1734                                 tu->queue = tr;
1735                         }
1736                 }
1737         }
1738         tu->qhead = tu->qtail = tu->qused = 0;
1739         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1740                 if (tu->tread) {
1741                         struct snd_timer_tread tread;
1742                         memset(&tread, 0, sizeof(tread));
1743                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1744                         tread.tstamp.tv_sec = 0;
1745                         tread.tstamp.tv_nsec = 0;
1746                         tread.val = 0;
1747                         snd_timer_user_append_to_tqueue(tu, &tread);
1748                 } else {
1749                         struct snd_timer_read *r = &tu->queue[0];
1750                         r->resolution = 0;
1751                         r->ticks = 0;
1752                         tu->qused++;
1753                         tu->qtail++;
1754                 }
1755         }
1756         tu->filter = params.filter;
1757         tu->ticks = params.ticks;
1758         err = 0;
1759  _end:
1760         if (copy_to_user(_params, &params, sizeof(params)))
1761                 return -EFAULT;
1762         return err;
1763 }
1764
1765 static int snd_timer_user_status(struct file *file,
1766                                  struct snd_timer_status __user *_status)
1767 {
1768         struct snd_timer_user *tu;
1769         struct snd_timer_status status;
1770
1771         tu = file->private_data;
1772         if (!tu->timeri)
1773                 return -EBADFD;
1774         memset(&status, 0, sizeof(status));
1775         status.tstamp = tu->tstamp;
1776         status.resolution = snd_timer_resolution(tu->timeri);
1777         status.lost = tu->timeri->lost;
1778         status.overrun = tu->overrun;
1779         spin_lock_irq(&tu->qlock);
1780         status.queue = tu->qused;
1781         spin_unlock_irq(&tu->qlock);
1782         if (copy_to_user(_status, &status, sizeof(status)))
1783                 return -EFAULT;
1784         return 0;
1785 }
1786
1787 static int snd_timer_user_start(struct file *file)
1788 {
1789         int err;
1790         struct snd_timer_user *tu;
1791
1792         tu = file->private_data;
1793         if (!tu->timeri)
1794                 return -EBADFD;
1795         snd_timer_stop(tu->timeri);
1796         tu->timeri->lost = 0;
1797         tu->last_resolution = 0;
1798         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1799 }
1800
1801 static int snd_timer_user_stop(struct file *file)
1802 {
1803         int err;
1804         struct snd_timer_user *tu;
1805
1806         tu = file->private_data;
1807         if (!tu->timeri)
1808                 return -EBADFD;
1809         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1810 }
1811
1812 static int snd_timer_user_continue(struct file *file)
1813 {
1814         int err;
1815         struct snd_timer_user *tu;
1816
1817         tu = file->private_data;
1818         if (!tu->timeri)
1819                 return -EBADFD;
1820         tu->timeri->lost = 0;
1821         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1822 }
1823
1824 static int snd_timer_user_pause(struct file *file)
1825 {
1826         int err;
1827         struct snd_timer_user *tu;
1828
1829         tu = file->private_data;
1830         if (!tu->timeri)
1831                 return -EBADFD;
1832         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1833 }
1834
1835 enum {
1836         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1837         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1838         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1839         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1840 };
1841
1842 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1843                                  unsigned long arg)
1844 {
1845         struct snd_timer_user *tu;
1846         void __user *argp = (void __user *)arg;
1847         int __user *p = argp;
1848
1849         tu = file->private_data;
1850         switch (cmd) {
1851         case SNDRV_TIMER_IOCTL_PVERSION:
1852                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1853         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1854                 return snd_timer_user_next_device(argp);
1855         case SNDRV_TIMER_IOCTL_TREAD:
1856         {
1857                 int xarg;
1858
1859                 if (tu->timeri) /* too late */
1860                         return -EBUSY;
1861                 if (get_user(xarg, p))
1862                         return -EFAULT;
1863                 tu->tread = xarg ? 1 : 0;
1864                 return 0;
1865         }
1866         case SNDRV_TIMER_IOCTL_GINFO:
1867                 return snd_timer_user_ginfo(file, argp);
1868         case SNDRV_TIMER_IOCTL_GPARAMS:
1869                 return snd_timer_user_gparams(file, argp);
1870         case SNDRV_TIMER_IOCTL_GSTATUS:
1871                 return snd_timer_user_gstatus(file, argp);
1872         case SNDRV_TIMER_IOCTL_SELECT:
1873                 return snd_timer_user_tselect(file, argp);
1874         case SNDRV_TIMER_IOCTL_INFO:
1875                 return snd_timer_user_info(file, argp);
1876         case SNDRV_TIMER_IOCTL_PARAMS:
1877                 return snd_timer_user_params(file, argp);
1878         case SNDRV_TIMER_IOCTL_STATUS:
1879                 return snd_timer_user_status(file, argp);
1880         case SNDRV_TIMER_IOCTL_START:
1881         case SNDRV_TIMER_IOCTL_START_OLD:
1882                 return snd_timer_user_start(file);
1883         case SNDRV_TIMER_IOCTL_STOP:
1884         case SNDRV_TIMER_IOCTL_STOP_OLD:
1885                 return snd_timer_user_stop(file);
1886         case SNDRV_TIMER_IOCTL_CONTINUE:
1887         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1888                 return snd_timer_user_continue(file);
1889         case SNDRV_TIMER_IOCTL_PAUSE:
1890         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1891                 return snd_timer_user_pause(file);
1892         }
1893         return -ENOTTY;
1894 }
1895
1896 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1897                                  unsigned long arg)
1898 {
1899         struct snd_timer_user *tu = file->private_data;
1900         long ret;
1901
1902         mutex_lock(&tu->ioctl_lock);
1903         ret = __snd_timer_user_ioctl(file, cmd, arg);
1904         mutex_unlock(&tu->ioctl_lock);
1905         return ret;
1906 }
1907
1908 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1909 {
1910         struct snd_timer_user *tu;
1911
1912         tu = file->private_data;
1913         return fasync_helper(fd, file, on, &tu->fasync);
1914 }
1915
1916 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1917                                    size_t count, loff_t *offset)
1918 {
1919         struct snd_timer_user *tu;
1920         long result = 0, unit;
1921         int qhead;
1922         int err = 0;
1923
1924         tu = file->private_data;
1925         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1926         spin_lock_irq(&tu->qlock);
1927         while ((long)count - result >= unit) {
1928                 while (!tu->qused) {
1929                         wait_queue_t wait;
1930
1931                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1932                                 err = -EAGAIN;
1933                                 goto _error;
1934                         }
1935
1936                         set_current_state(TASK_INTERRUPTIBLE);
1937                         init_waitqueue_entry(&wait, current);
1938                         add_wait_queue(&tu->qchange_sleep, &wait);
1939
1940                         spin_unlock_irq(&tu->qlock);
1941                         schedule();
1942                         spin_lock_irq(&tu->qlock);
1943
1944                         remove_wait_queue(&tu->qchange_sleep, &wait);
1945
1946                         if (tu->disconnected) {
1947                                 err = -ENODEV;
1948                                 goto _error;
1949                         }
1950                         if (signal_pending(current)) {
1951                                 err = -ERESTARTSYS;
1952                                 goto _error;
1953                         }
1954                 }
1955
1956                 qhead = tu->qhead++;
1957                 tu->qhead %= tu->queue_size;
1958                 tu->qused--;
1959                 spin_unlock_irq(&tu->qlock);
1960
1961                 if (tu->tread) {
1962                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1963                                          sizeof(struct snd_timer_tread)))
1964                                 err = -EFAULT;
1965                 } else {
1966                         if (copy_to_user(buffer, &tu->queue[qhead],
1967                                          sizeof(struct snd_timer_read)))
1968                                 err = -EFAULT;
1969                 }
1970
1971                 spin_lock_irq(&tu->qlock);
1972                 if (err < 0)
1973                         goto _error;
1974                 result += unit;
1975                 buffer += unit;
1976         }
1977  _error:
1978         spin_unlock_irq(&tu->qlock);
1979         return result > 0 ? result : err;
1980 }
1981
1982 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1983 {
1984         unsigned int mask;
1985         struct snd_timer_user *tu;
1986
1987         tu = file->private_data;
1988
1989         poll_wait(file, &tu->qchange_sleep, wait);
1990
1991         mask = 0;
1992         if (tu->qused)
1993                 mask |= POLLIN | POLLRDNORM;
1994         if (tu->disconnected)
1995                 mask |= POLLERR;
1996
1997         return mask;
1998 }
1999
2000 #ifdef CONFIG_COMPAT
2001 #include "timer_compat.c"
2002 #else
2003 #define snd_timer_user_ioctl_compat     NULL
2004 #endif
2005
2006 static const struct file_operations snd_timer_f_ops =
2007 {
2008         .owner =        THIS_MODULE,
2009         .read =         snd_timer_user_read,
2010         .open =         snd_timer_user_open,
2011         .release =      snd_timer_user_release,
2012         .llseek =       no_llseek,
2013         .poll =         snd_timer_user_poll,
2014         .unlocked_ioctl =       snd_timer_user_ioctl,
2015         .compat_ioctl = snd_timer_user_ioctl_compat,
2016         .fasync =       snd_timer_user_fasync,
2017 };
2018
2019 /* unregister the system timer */
2020 static void snd_timer_free_all(void)
2021 {
2022         struct snd_timer *timer, *n;
2023
2024         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2025                 snd_timer_free(timer);
2026 }
2027
2028 static struct device timer_dev;
2029
2030 /*
2031  *  ENTRY functions
2032  */
2033
2034 static int __init alsa_timer_init(void)
2035 {
2036         int err;
2037
2038         snd_device_initialize(&timer_dev, NULL);
2039         dev_set_name(&timer_dev, "timer");
2040
2041 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2042         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2043                               "system timer");
2044 #endif
2045
2046         err = snd_timer_register_system();
2047         if (err < 0) {
2048                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2049                 put_device(&timer_dev);
2050                 return err;
2051         }
2052
2053         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2054                                   &snd_timer_f_ops, NULL, &timer_dev);
2055         if (err < 0) {
2056                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2057                 snd_timer_free_all();
2058                 put_device(&timer_dev);
2059                 return err;
2060         }
2061
2062         snd_timer_proc_init();
2063         return 0;
2064 }
2065
2066 static void __exit alsa_timer_exit(void)
2067 {
2068         snd_unregister_device(&timer_dev);
2069         snd_timer_free_all();
2070         put_device(&timer_dev);
2071         snd_timer_proc_done();
2072 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2073         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2074 #endif
2075 }
2076
2077 module_init(alsa_timer_init)
2078 module_exit(alsa_timer_exit)
2079
2080 EXPORT_SYMBOL(snd_timer_open);
2081 EXPORT_SYMBOL(snd_timer_close);
2082 EXPORT_SYMBOL(snd_timer_resolution);
2083 EXPORT_SYMBOL(snd_timer_start);
2084 EXPORT_SYMBOL(snd_timer_stop);
2085 EXPORT_SYMBOL(snd_timer_continue);
2086 EXPORT_SYMBOL(snd_timer_pause);
2087 EXPORT_SYMBOL(snd_timer_new);
2088 EXPORT_SYMBOL(snd_timer_notify);
2089 EXPORT_SYMBOL(snd_timer_global_new);
2090 EXPORT_SYMBOL(snd_timer_global_free);
2091 EXPORT_SYMBOL(snd_timer_global_register);
2092 EXPORT_SYMBOL(snd_timer_interrupt);