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 #elif IS_ENABLED(CONFIG_SND_RTCTIMER)
  41 #define DEFAULT_TIMER_LIMIT 2
  42 #else
  43 #define DEFAULT_TIMER_LIMIT 1
  44 #endif
  45
  46 static int timer_limit = DEFAULT_TIMER_LIMIT;
  47 static int timer_tstamp_monotonic = 1;
  48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  49 MODULE_DESCRIPTION("ALSA timer interface");
  50 MODULE_LICENSE("GPL");
  51 module_param(timer_limit, int, 0444);
  52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  53 module_param(timer_tstamp_monotonic, int, 0444);
  54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  55
  56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  57 MODULE_ALIAS("devname:snd/timer");
  58
  59 struct snd_timer_user {
  60         struct snd_timer_instance *timeri;
  61         int tread;              /* enhanced read with timestamps and events */
  62         unsigned long ticks;
  63         unsigned long overrun;
  64         int qhead;
  65         int qtail;
  66         int qused;
  67         int queue_size;
  68         bool disconnected;
  69         struct snd_timer_read *queue;
  70         struct snd_timer_tread *tqueue;
  71         spinlock_t qlock;
  72         unsigned long last_resolution;
  73         unsigned int filter;
  74         struct timespec tstamp;         /* trigger tstamp */
  75         wait_queue_head_t qchange_sleep;
  76         struct fasync_struct *fasync;
  77         struct mutex ioctl_lock;
  78 };
  79
  80 /* list of timers */
  81 static LIST_HEAD(snd_timer_list);
  82
  83 /* list of slave instances */
  84 static LIST_HEAD(snd_timer_slave_list);
  85
  86 /* lock for slave active lists */
  87 static DEFINE_SPINLOCK(slave_active_lock);
  88
  89 static DEFINE_MUTEX(register_mutex);
  90
  91 static int snd_timer_free(struct snd_timer *timer);
  92 static int snd_timer_dev_free(struct snd_device *device);
  93 static int snd_timer_dev_register(struct snd_device *device);
  94 static int snd_timer_dev_disconnect(struct snd_device *device);
  95
  96 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  97
  98 /*
  99  * create a timer instance with the given owner string.
 100  * when timer is not NULL, increments the module counter
 101  */
 102 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 103                                                          struct snd_timer *timer)
 104 {
 105         struct snd_timer_instance *timeri;
 106         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 107         if (timeri == NULL)
 108                 return NULL;
 109         timeri->owner = kstrdup(owner, GFP_KERNEL);
 110         if (! timeri->owner) {
 111                 kfree(timeri);
 112                 return NULL;
 113         }
 114         INIT_LIST_HEAD(&timeri->open_list);
 115         INIT_LIST_HEAD(&timeri->active_list);
 116         INIT_LIST_HEAD(&timeri->ack_list);
 117         INIT_LIST_HEAD(&timeri->slave_list_head);
 118         INIT_LIST_HEAD(&timeri->slave_active_head);
 119
 120         timeri->timer = timer;
 121         if (timer && !try_module_get(timer->module)) {
 122                 kfree(timeri->owner);
 123                 kfree(timeri);
 124                 return NULL;
 125         }
 126
 127         return timeri;
 128 }
 129
 130 /*
 131  * find a timer instance from the given timer id
 132  */
 133 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 134 {
 135         struct snd_timer *timer = NULL;
 136
 137         list_for_each_entry(timer, &snd_timer_list, device_list) {
 138                 if (timer->tmr_class != tid->dev_class)
 139                         continue;
 140                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 141                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 142                     (timer->card == NULL ||
 143                      timer->card->number != tid->card))
 144                         continue;
 145                 if (timer->tmr_device != tid->device)
 146                         continue;
 147                 if (timer->tmr_subdevice != tid->subdevice)
 148                         continue;
 149                 return timer;
 150         }
 151         return NULL;
 152 }
 153
 154 #ifdef CONFIG_MODULES
 155
 156 static void snd_timer_request(struct snd_timer_id *tid)
 157 {
 158         switch (tid->dev_class) {
 159         case SNDRV_TIMER_CLASS_GLOBAL:
 160                 if (tid->device < timer_limit)
 161                         request_module("snd-timer-%i", tid->device);
 162                 break;
 163         case SNDRV_TIMER_CLASS_CARD:
 164         case SNDRV_TIMER_CLASS_PCM:
 165                 if (tid->card < snd_ecards_limit)
 166                         request_module("snd-card-%i", tid->card);
 167                 break;
 168         default:
 169                 break;
 170         }
 171 }
 172
 173 #endif
 174
 175 /*
 176  * look for a master instance matching with the slave id of the given slave.
 177  * when found, relink the open_link of the slave.
 178  *
 179  * call this with register_mutex down.
 180  */
 181 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 182 {
 183         struct snd_timer *timer;
 184         struct snd_timer_instance *master;
 185
 186         /* FIXME: it's really dumb to look up all entries.. */
 187         list_for_each_entry(timer, &snd_timer_list, device_list) {
 188                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 189                         if (slave->slave_class == master->slave_class &&
 190                             slave->slave_id == master->slave_id) {
 191                                 list_move_tail(&slave->open_list,
 192                                                &master->slave_list_head);
 193                                 spin_lock_irq(&slave_active_lock);
 194                                 slave->master = master;
 195                                 slave->timer = master->timer;
 196                                 spin_unlock_irq(&slave_active_lock);
 197                                 return;
 198                         }
 199                 }
 200         }
 201 }
 202
 203 /*
 204  * look for slave instances matching with the slave id of the given master.
 205  * when found, relink the open_link of slaves.
 206  *
 207  * call this with register_mutex down.
 208  */
 209 static void snd_timer_check_master(struct snd_timer_instance *master)
 210 {
 211         struct snd_timer_instance *slave, *tmp;
 212
 213         /* check all pending slaves */
 214         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 215                 if (slave->slave_class == master->slave_class &&
 216                     slave->slave_id == master->slave_id) {
 217                         list_move_tail(&slave->open_list, &master->slave_list_head);
 218                         spin_lock_irq(&slave_active_lock);
 219                         spin_lock(&master->timer->lock);
 220                         slave->master = master;
 221                         slave->timer = master->timer;
 222                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 223                                 list_add_tail(&slave->active_list,
 224                                               &master->slave_active_head);
 225                         spin_unlock(&master->timer->lock);
 226                         spin_unlock_irq(&slave_active_lock);
 227                 }
 228         }
 229 }
 230
 231 /*
 232  * open a timer instance
 233  * when opening a master, the slave id must be here given.
 234  */
 235 int snd_timer_open(struct snd_timer_instance **ti,
 236                    char *owner, struct snd_timer_id *tid,
 237                    unsigned int slave_id)
 238 {
 239         struct snd_timer *timer;
 240         struct snd_timer_instance *timeri = NULL;
 241
 242         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 243                 /* open a slave instance */
 244                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 245                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 246                         pr_debug("ALSA: timer: invalid slave class %i\n",
 247                                  tid->dev_sclass);
 248                         return -EINVAL;
 249                 }
 250                 mutex_lock(&register_mutex);
 251                 timeri = snd_timer_instance_new(owner, NULL);
 252                 if (!timeri) {
 253                         mutex_unlock(&register_mutex);
 254                         return -ENOMEM;
 255                 }
 256                 timeri->slave_class = tid->dev_sclass;
 257                 timeri->slave_id = tid->device;
 258                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 259                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 260                 snd_timer_check_slave(timeri);
 261                 mutex_unlock(&register_mutex);
 262                 *ti = timeri;
 263                 return 0;
 264         }
 265
 266         /* open a master instance */
 267         mutex_lock(&register_mutex);
 268         timer = snd_timer_find(tid);
 269 #ifdef CONFIG_MODULES
 270         if (!timer) {
 271                 mutex_unlock(&register_mutex);
 272                 snd_timer_request(tid);
 273                 mutex_lock(&register_mutex);
 274                 timer = snd_timer_find(tid);
 275         }
 276 #endif
 277         if (!timer) {
 278                 mutex_unlock(&register_mutex);
 279                 return -ENODEV;
 280         }
 281         if (!list_empty(&timer->open_list_head)) {
 282                 timeri = list_entry(timer->open_list_head.next,
 283                                     struct snd_timer_instance, open_list);
 284                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 285                         mutex_unlock(&register_mutex);
 286                         return -EBUSY;
 287                 }
 288         }
 289         timeri = snd_timer_instance_new(owner, timer);
 290         if (!timeri) {
 291                 mutex_unlock(&register_mutex);
 292                 return -ENOMEM;
 293         }
 294         /* take a card refcount for safe disconnection */
 295         if (timer->card)
 296                 get_device(&timer->card->card_dev);
 297         timeri->slave_class = tid->dev_sclass;
 298         timeri->slave_id = slave_id;
 299         if (list_empty(&timer->open_list_head) && timer->hw.open)
 300                 timer->hw.open(timer);
 301         list_add_tail(&timeri->open_list, &timer->open_list_head);
 302         snd_timer_check_master(timeri);
 303         mutex_unlock(&register_mutex);
 304         *ti = timeri;
 305         return 0;
 306 }
 307
 308 /*
 309  * close a timer instance
 310  */
 311 int snd_timer_close(struct snd_timer_instance *timeri)
 312 {
 313         struct snd_timer *timer = NULL;
 314         struct snd_timer_instance *slave, *tmp;
 315
 316         if (snd_BUG_ON(!timeri))
 317                 return -ENXIO;
 318
 319         mutex_lock(&register_mutex);
 320         list_del(&timeri->open_list);
 321
 322         /* force to stop the timer */
 323         snd_timer_stop(timeri);
 324
 325         timer = timeri->timer;
 326         if (timer) {
 327                 /* wait, until the active callback is finished */
 328                 spin_lock_irq(&timer->lock);
 329                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 330                         spin_unlock_irq(&timer->lock);
 331                         udelay(10);
 332                         spin_lock_irq(&timer->lock);
 333                 }
 334                 spin_unlock_irq(&timer->lock);
 335
 336                 /* remove slave links */
 337                 spin_lock_irq(&slave_active_lock);
 338                 spin_lock(&timer->lock);
 339                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 340                                          open_list) {
 341                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 342                         slave->master = NULL;
 343                         slave->timer = NULL;
 344                         list_del_init(&slave->ack_list);
 345                         list_del_init(&slave->active_list);
 346                 }
 347                 spin_unlock(&timer->lock);
 348                 spin_unlock_irq(&slave_active_lock);
 349
 350                 /* slave doesn't need to release timer resources below */
 351                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 352                         timer = NULL;
 353         }
 354
 355         if (timeri->private_free)
 356                 timeri->private_free(timeri);
 357         kfree(timeri->owner);
 358         kfree(timeri);
 359
 360         if (timer) {
 361                 if (list_empty(&timer->open_list_head) && timer->hw.close)
 362                         timer->hw.close(timer);
 363                 /* release a card refcount for safe disconnection */
 364                 if (timer->card)
 365                         put_device(&timer->card->card_dev);
 366                 module_put(timer->module);
 367         }
 368
 369         mutex_unlock(&register_mutex);
 370         return 0;
 371 }
 372
 373 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 374 {
 375         struct snd_timer * timer;
 376
 377         if (timeri == NULL)
 378                 return 0;
 379         if ((timer = timeri->timer) != NULL) {
 380                 if (timer->hw.c_resolution)
 381                         return timer->hw.c_resolution(timer);
 382                 return timer->hw.resolution;
 383         }
 384         return 0;
 385 }
 386
 387 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 388 {
 389         struct snd_timer *timer;
 390         unsigned long resolution = 0;
 391         struct snd_timer_instance *ts;
 392         struct timespec tstamp;
 393
 394         if (timer_tstamp_monotonic)
 395                 ktime_get_ts(&tstamp);
 396         else
 397                 getnstimeofday(&tstamp);
 398         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 399                        event > SNDRV_TIMER_EVENT_PAUSE))
 400                 return;
 401         if (event == SNDRV_TIMER_EVENT_START ||
 402             event == SNDRV_TIMER_EVENT_CONTINUE)
 403                 resolution = snd_timer_resolution(ti);
 404         if (ti->ccallback)
 405                 ti->ccallback(ti, event, &tstamp, resolution);
 406         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 407                 return;
 408         timer = ti->timer;
 409         if (timer == NULL)
 410                 return;
 411         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 412                 return;
 413         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 414                 if (ts->ccallback)
 415                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 416 }
 417
 418 /* start/continue a master timer */
 419 static int snd_timer_start1(struct snd_timer_instance *timeri,
 420                             bool start, unsigned long ticks)
 421 {
 422         struct snd_timer *timer;
 423         int result;
 424         unsigned long flags;
 425
 426         timer = timeri->timer;
 427         if (!timer)
 428                 return -EINVAL;
 429
 430         spin_lock_irqsave(&timer->lock, flags);
 431         if (timer->card && timer->card->shutdown) {
 432                 result = -ENODEV;
 433                 goto unlock;
 434         }
 435         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 436                              SNDRV_TIMER_IFLG_START)) {
 437                 result = -EBUSY;
 438                 goto unlock;
 439         }
 440
 441         if (start)
 442                 timeri->ticks = timeri->cticks = ticks;
 443         else if (!timeri->cticks)
 444                 timeri->cticks = 1;
 445         timeri->pticks = 0;
 446
 447         list_move_tail(&timeri->active_list, &timer->active_list_head);
 448         if (timer->running) {
 449                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 450                         goto __start_now;
 451                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 452                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 453                 result = 1; /* delayed start */
 454         } else {
 455                 if (start)
 456                         timer->sticks = ticks;
 457                 timer->hw.start(timer);
 458               __start_now:
 459                 timer->running++;
 460                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 461                 result = 0;
 462         }
 463         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 464                           SNDRV_TIMER_EVENT_CONTINUE);
 465  unlock:
 466         spin_unlock_irqrestore(&timer->lock, flags);
 467         return result;
 468 }
 469
 470 /* start/continue a slave timer */
 471 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
 472                                  bool start)
 473 {
 474         unsigned long flags;
 475
 476         spin_lock_irqsave(&slave_active_lock, flags);
 477         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 478                 spin_unlock_irqrestore(&slave_active_lock, flags);
 479                 return -EBUSY;
 480         }
 481         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 482         if (timeri->master && timeri->timer) {
 483                 spin_lock(&timeri->timer->lock);
 484                 list_add_tail(&timeri->active_list,
 485                               &timeri->master->slave_active_head);
 486                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 487                                   SNDRV_TIMER_EVENT_CONTINUE);
 488                 spin_unlock(&timeri->timer->lock);
 489         }
 490         spin_unlock_irqrestore(&slave_active_lock, flags);
 491         return 1; /* delayed start */
 492 }
 493
 494 /* stop/pause a master timer */
 495 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
 496 {
 497         struct snd_timer *timer;
 498         int result = 0;
 499         unsigned long flags;
 500
 501         timer = timeri->timer;
 502         if (!timer)
 503                 return -EINVAL;
 504         spin_lock_irqsave(&timer->lock, flags);
 505         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 506                                SNDRV_TIMER_IFLG_START))) {
 507                 result = -EBUSY;
 508                 goto unlock;
 509         }
 510         list_del_init(&timeri->ack_list);
 511         list_del_init(&timeri->active_list);
 512         if (timer->card && timer->card->shutdown)
 513                 goto unlock;
 514         if (stop) {
 515                 timeri->cticks = timeri->ticks;
 516                 timeri->pticks = 0;
 517         }
 518         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 519             !(--timer->running)) {
 520                 timer->hw.stop(timer);
 521                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 522                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 523                         snd_timer_reschedule(timer, 0);
 524                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 525                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 526                                 timer->hw.start(timer);
 527                         }
 528                 }
 529         }
 530         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 531         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 532                           SNDRV_TIMER_EVENT_CONTINUE);
 533  unlock:
 534         spin_unlock_irqrestore(&timer->lock, flags);
 535         return result;
 536 }
 537
 538 /* stop/pause a slave timer */
 539 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
 540 {
 541         unsigned long flags;
 542
 543         spin_lock_irqsave(&slave_active_lock, flags);
 544         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 545                 spin_unlock_irqrestore(&slave_active_lock, flags);
 546                 return -EBUSY;
 547         }
 548         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 549         if (timeri->timer) {
 550                 spin_lock(&timeri->timer->lock);
 551                 list_del_init(&timeri->ack_list);
 552                 list_del_init(&timeri->active_list);
 553                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 554                                   SNDRV_TIMER_EVENT_CONTINUE);
 555                 spin_unlock(&timeri->timer->lock);
 556         }
 557         spin_unlock_irqrestore(&slave_active_lock, flags);
 558         return 0;
 559 }
 560
 561 /*
 562  *  start the timer instance
 563  */
 564 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 565 {
 566         if (timeri == NULL || ticks < 1)
 567                 return -EINVAL;
 568         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 569                 return snd_timer_start_slave(timeri, true);
 570         else
 571                 return snd_timer_start1(timeri, true, ticks);
 572 }
 573
 574 /*
 575  * stop the timer instance.
 576  *
 577  * do not call this from the timer callback!
 578  */
 579 int snd_timer_stop(struct snd_timer_instance *timeri)
 580 {
 581         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 582                 return snd_timer_stop_slave(timeri, true);
 583         else
 584                 return snd_timer_stop1(timeri, true);
 585 }
 586
 587 /*
 588  * start again..  the tick is kept.
 589  */
 590 int snd_timer_continue(struct snd_timer_instance *timeri)
 591 {
 592         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 593                 return snd_timer_start_slave(timeri, false);
 594         else
 595                 return snd_timer_start1(timeri, false, 0);
 596 }
 597
 598 /*
 599  * pause.. remember the ticks left
 600  */
 601 int snd_timer_pause(struct snd_timer_instance * timeri)
 602 {
 603         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 604                 return snd_timer_stop_slave(timeri, false);
 605         else
 606                 return snd_timer_stop1(timeri, false);
 607 }
 608
 609 /*
 610  * reschedule the timer
 611  *
 612  * start pending instances and check the scheduling ticks.
 613  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 614  */
 615 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 616 {
 617         struct snd_timer_instance *ti;
 618         unsigned long ticks = ~0UL;
 619
 620         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 621                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 622                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 623                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 624                         timer->running++;
 625                 }
 626                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 627                         if (ticks > ti->cticks)
 628                                 ticks = ti->cticks;
 629                 }
 630         }
 631         if (ticks == ~0UL) {
 632                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 633                 return;
 634         }
 635         if (ticks > timer->hw.ticks)
 636                 ticks = timer->hw.ticks;
 637         if (ticks_left != ticks)
 638                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 639         timer->sticks = ticks;
 640 }
 641
 642 /*
 643  * timer tasklet
 644  *
 645  */
 646 static void snd_timer_tasklet(unsigned long arg)
 647 {
 648         struct snd_timer *timer = (struct snd_timer *) arg;
 649         struct snd_timer_instance *ti;
 650         struct list_head *p;
 651         unsigned long resolution, ticks;
 652         unsigned long flags;
 653
 654         if (timer->card && timer->card->shutdown)
 655                 return;
 656
 657         spin_lock_irqsave(&timer->lock, flags);
 658         /* now process all callbacks */
 659         while (!list_empty(&timer->sack_list_head)) {
 660                 p = timer->sack_list_head.next;         /* get first item */
 661                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 662
 663                 /* remove from ack_list and make empty */
 664                 list_del_init(p);
 665
 666                 ticks = ti->pticks;
 667                 ti->pticks = 0;
 668                 resolution = ti->resolution;
 669
 670                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 671                 spin_unlock(&timer->lock);
 672                 if (ti->callback)
 673                         ti->callback(ti, resolution, ticks);
 674                 spin_lock(&timer->lock);
 675                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 676         }
 677         spin_unlock_irqrestore(&timer->lock, flags);
 678 }
 679
 680 /*
 681  * timer interrupt
 682  *
 683  * ticks_left is usually equal to timer->sticks.
 684  *
 685  */
 686 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 687 {
 688         struct snd_timer_instance *ti, *ts, *tmp;
 689         unsigned long resolution, ticks;
 690         struct list_head *p, *ack_list_head;
 691         unsigned long flags;
 692         int use_tasklet = 0;
 693
 694         if (timer == NULL)
 695                 return;
 696
 697         if (timer->card && timer->card->shutdown)
 698                 return;
 699
 700         spin_lock_irqsave(&timer->lock, flags);
 701
 702         /* remember the current resolution */
 703         if (timer->hw.c_resolution)
 704                 resolution = timer->hw.c_resolution(timer);
 705         else
 706                 resolution = timer->hw.resolution;
 707
 708         /* loop for all active instances
 709          * Here we cannot use list_for_each_entry because the active_list of a
 710          * processed instance is relinked to done_list_head before the callback
 711          * is called.
 712          */
 713         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 714                                  active_list) {
 715                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 716                         continue;
 717                 ti->pticks += ticks_left;
 718                 ti->resolution = resolution;
 719                 if (ti->cticks < ticks_left)
 720                         ti->cticks = 0;
 721                 else
 722                         ti->cticks -= ticks_left;
 723                 if (ti->cticks) /* not expired */
 724                         continue;
 725                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 726                         ti->cticks = ti->ticks;
 727                 } else {
 728                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 729                         --timer->running;
 730                         list_del_init(&ti->active_list);
 731                 }
 732                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 733                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 734                         ack_list_head = &timer->ack_list_head;
 735                 else
 736                         ack_list_head = &timer->sack_list_head;
 737                 if (list_empty(&ti->ack_list))
 738                         list_add_tail(&ti->ack_list, ack_list_head);
 739                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 740                         ts->pticks = ti->pticks;
 741                         ts->resolution = resolution;
 742                         if (list_empty(&ts->ack_list))
 743                                 list_add_tail(&ts->ack_list, ack_list_head);
 744                 }
 745         }
 746         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 747                 snd_timer_reschedule(timer, timer->sticks);
 748         if (timer->running) {
 749                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 750                         timer->hw.stop(timer);
 751                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 752                 }
 753                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 754                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 755                         /* restart timer */
 756                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 757                         timer->hw.start(timer);
 758                 }
 759         } else {
 760                 timer->hw.stop(timer);
 761         }
 762
 763         /* now process all fast callbacks */
 764         while (!list_empty(&timer->ack_list_head)) {
 765                 p = timer->ack_list_head.next;          /* get first item */
 766                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 767
 768                 /* remove from ack_list and make empty */
 769                 list_del_init(p);
 770
 771                 ticks = ti->pticks;
 772                 ti->pticks = 0;
 773
 774                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 775                 spin_unlock(&timer->lock);
 776                 if (ti->callback)
 777                         ti->callback(ti, resolution, ticks);
 778                 spin_lock(&timer->lock);
 779                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 780         }
 781
 782         /* do we have any slow callbacks? */
 783         use_tasklet = !list_empty(&timer->sack_list_head);
 784         spin_unlock_irqrestore(&timer->lock, flags);
 785
 786         if (use_tasklet)
 787                 tasklet_schedule(&timer->task_queue);
 788 }
 789
 790 /*
 791
 792  */
 793
 794 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 795                   struct snd_timer **rtimer)
 796 {
 797         struct snd_timer *timer;
 798         int err;
 799         static struct snd_device_ops ops = {
 800                 .dev_free = snd_timer_dev_free,
 801                 .dev_register = snd_timer_dev_register,
 802                 .dev_disconnect = snd_timer_dev_disconnect,
 803         };
 804
 805         if (snd_BUG_ON(!tid))
 806                 return -EINVAL;
 807         if (rtimer)
 808                 *rtimer = NULL;
 809         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 810         if (!timer)
 811                 return -ENOMEM;
 812         timer->tmr_class = tid->dev_class;
 813         timer->card = card;
 814         timer->tmr_device = tid->device;
 815         timer->tmr_subdevice = tid->subdevice;
 816         if (id)
 817                 strlcpy(timer->id, id, sizeof(timer->id));
 818         INIT_LIST_HEAD(&timer->device_list);
 819         INIT_LIST_HEAD(&timer->open_list_head);
 820         INIT_LIST_HEAD(&timer->active_list_head);
 821         INIT_LIST_HEAD(&timer->ack_list_head);
 822         INIT_LIST_HEAD(&timer->sack_list_head);
 823         spin_lock_init(&timer->lock);
 824         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 825                      (unsigned long)timer);
 826         if (card != NULL) {
 827                 timer->module = card->module;
 828                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 829                 if (err < 0) {
 830                         snd_timer_free(timer);
 831                         return err;
 832                 }
 833         }
 834         if (rtimer)
 835                 *rtimer = timer;
 836         return 0;
 837 }
 838
 839 static int snd_timer_free(struct snd_timer *timer)
 840 {
 841         if (!timer)
 842                 return 0;
 843
 844         mutex_lock(&register_mutex);
 845         if (! list_empty(&timer->open_list_head)) {
 846                 struct list_head *p, *n;
 847                 struct snd_timer_instance *ti;
 848                 pr_warn("ALSA: timer %p is busy?\n", timer);
 849                 list_for_each_safe(p, n, &timer->open_list_head) {
 850                         list_del_init(p);
 851                         ti = list_entry(p, struct snd_timer_instance, open_list);
 852                         ti->timer = NULL;
 853                 }
 854         }
 855         list_del(&timer->device_list);
 856         mutex_unlock(&register_mutex);
 857
 858         if (timer->private_free)
 859                 timer->private_free(timer);
 860         kfree(timer);
 861         return 0;
 862 }
 863
 864 static int snd_timer_dev_free(struct snd_device *device)
 865 {
 866         struct snd_timer *timer = device->device_data;
 867         return snd_timer_free(timer);
 868 }
 869
 870 static int snd_timer_dev_register(struct snd_device *dev)
 871 {
 872         struct snd_timer *timer = dev->device_data;
 873         struct snd_timer *timer1;
 874
 875         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 876                 return -ENXIO;
 877         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 878             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 879                 return -EINVAL;
 880
 881         mutex_lock(&register_mutex);
 882         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 883                 if (timer1->tmr_class > timer->tmr_class)
 884                         break;
 885                 if (timer1->tmr_class < timer->tmr_class)
 886                         continue;
 887                 if (timer1->card && timer->card) {
 888                         if (timer1->card->number > timer->card->number)
 889                                 break;
 890                         if (timer1->card->number < timer->card->number)
 891                                 continue;
 892                 }
 893                 if (timer1->tmr_device > timer->tmr_device)
 894                         break;
 895                 if (timer1->tmr_device < timer->tmr_device)
 896                         continue;
 897                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 898                         break;
 899                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 900                         continue;
 901                 /* conflicts.. */
 902                 mutex_unlock(&register_mutex);
 903                 return -EBUSY;
 904         }
 905         list_add_tail(&timer->device_list, &timer1->device_list);
 906         mutex_unlock(&register_mutex);
 907         return 0;
 908 }
 909
 910 static int snd_timer_dev_disconnect(struct snd_device *device)
 911 {
 912         struct snd_timer *timer = device->device_data;
 913         struct snd_timer_instance *ti;
 914
 915         mutex_lock(&register_mutex);
 916         list_del_init(&timer->device_list);
 917         /* wake up pending sleepers */
 918         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 919                 if (ti->disconnect)
 920                         ti->disconnect(ti);
 921         }
 922         mutex_unlock(&register_mutex);
 923         return 0;
 924 }
 925
 926 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 927 {
 928         unsigned long flags;
 929         unsigned long resolution = 0;
 930         struct snd_timer_instance *ti, *ts;
 931
 932         if (timer->card && timer->card->shutdown)
 933                 return;
 934         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 935                 return;
 936         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 937                        event > SNDRV_TIMER_EVENT_MRESUME))
 938                 return;
 939         spin_lock_irqsave(&timer->lock, flags);
 940         if (event == SNDRV_TIMER_EVENT_MSTART ||
 941             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 942             event == SNDRV_TIMER_EVENT_MRESUME) {
 943                 if (timer->hw.c_resolution)
 944                         resolution = timer->hw.c_resolution(timer);
 945                 else
 946                         resolution = timer->hw.resolution;
 947         }
 948         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 949                 if (ti->ccallback)
 950                         ti->ccallback(ti, event, tstamp, resolution);
 951                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 952                         if (ts->ccallback)
 953                                 ts->ccallback(ts, event, tstamp, resolution);
 954         }
 955         spin_unlock_irqrestore(&timer->lock, flags);
 956 }
 957
 958 /*
 959  * exported functions for global timers
 960  */
 961 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 962 {
 963         struct snd_timer_id tid;
 964
 965         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 966         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 967         tid.card = -1;
 968         tid.device = device;
 969         tid.subdevice = 0;
 970         return snd_timer_new(NULL, id, &tid, rtimer);
 971 }
 972
 973 int snd_timer_global_free(struct snd_timer *timer)
 974 {
 975         return snd_timer_free(timer);
 976 }
 977
 978 int snd_timer_global_register(struct snd_timer *timer)
 979 {
 980         struct snd_device dev;
 981
 982         memset(&dev, 0, sizeof(dev));
 983         dev.device_data = timer;
 984         return snd_timer_dev_register(&dev);
 985 }
 986
 987 /*
 988  *  System timer
 989  */
 990
 991 struct snd_timer_system_private {
 992         struct timer_list tlist;
 993         unsigned long last_expires;
 994         unsigned long last_jiffies;
 995         unsigned long correction;
 996 };
 997
 998 static void snd_timer_s_function(unsigned long data)
 999 {
1000         struct snd_timer *timer = (struct snd_timer *)data;
1001         struct snd_timer_system_private *priv = timer->private_data;
1002         unsigned long jiff = jiffies;
1003         if (time_after(jiff, priv->last_expires))
1004                 priv->correction += (long)jiff - (long)priv->last_expires;
1005         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1006 }
1007
1008 static int snd_timer_s_start(struct snd_timer * timer)
1009 {
1010         struct snd_timer_system_private *priv;
1011         unsigned long njiff;
1012
1013         priv = (struct snd_timer_system_private *) timer->private_data;
1014         njiff = (priv->last_jiffies = jiffies);
1015         if (priv->correction > timer->sticks - 1) {
1016                 priv->correction -= timer->sticks - 1;
1017                 njiff++;
1018         } else {
1019                 njiff += timer->sticks - priv->correction;
1020                 priv->correction = 0;
1021         }
1022         priv->last_expires = njiff;
1023         mod_timer(&priv->tlist, njiff);
1024         return 0;
1025 }
1026
1027 static int snd_timer_s_stop(struct snd_timer * timer)
1028 {
1029         struct snd_timer_system_private *priv;
1030         unsigned long jiff;
1031
1032         priv = (struct snd_timer_system_private *) timer->private_data;
1033         del_timer(&priv->tlist);
1034         jiff = jiffies;
1035         if (time_before(jiff, priv->last_expires))
1036                 timer->sticks = priv->last_expires - jiff;
1037         else
1038                 timer->sticks = 1;
1039         priv->correction = 0;
1040         return 0;
1041 }
1042
1043 static int snd_timer_s_close(struct snd_timer *timer)
1044 {
1045         struct snd_timer_system_private *priv;
1046
1047         priv = (struct snd_timer_system_private *)timer->private_data;
1048         del_timer_sync(&priv->tlist);
1049         return 0;
1050 }
1051
1052 static struct snd_timer_hardware snd_timer_system =
1053 {
1054         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1055         .resolution =   1000000000L / HZ,
1056         .ticks =        10000000L,
1057         .close =        snd_timer_s_close,
1058         .start =        snd_timer_s_start,
1059         .stop =         snd_timer_s_stop
1060 };
1061
1062 static void snd_timer_free_system(struct snd_timer *timer)
1063 {
1064         kfree(timer->private_data);
1065 }
1066
1067 static int snd_timer_register_system(void)
1068 {
1069         struct snd_timer *timer;
1070         struct snd_timer_system_private *priv;
1071         int err;
1072
1073         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1074         if (err < 0)
1075                 return err;
1076         strcpy(timer->name, "system timer");
1077         timer->hw = snd_timer_system;
1078         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1079         if (priv == NULL) {
1080                 snd_timer_free(timer);
1081                 return -ENOMEM;
1082         }
1083         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1084         timer->private_data = priv;
1085         timer->private_free = snd_timer_free_system;
1086         return snd_timer_global_register(timer);
1087 }
1088
1089 #ifdef CONFIG_SND_PROC_FS
1090 /*
1091  *  Info interface
1092  */
1093
1094 static void snd_timer_proc_read(struct snd_info_entry *entry,
1095                                 struct snd_info_buffer *buffer)
1096 {
1097         struct snd_timer *timer;
1098         struct snd_timer_instance *ti;
1099
1100         mutex_lock(&register_mutex);
1101         list_for_each_entry(timer, &snd_timer_list, device_list) {
1102                 if (timer->card && timer->card->shutdown)
1103                         continue;
1104                 switch (timer->tmr_class) {
1105                 case SNDRV_TIMER_CLASS_GLOBAL:
1106                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1107                         break;
1108                 case SNDRV_TIMER_CLASS_CARD:
1109                         snd_iprintf(buffer, "C%i-%i: ",
1110                                     timer->card->number, timer->tmr_device);
1111                         break;
1112                 case SNDRV_TIMER_CLASS_PCM:
1113                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1114                                     timer->tmr_device, timer->tmr_subdevice);
1115                         break;
1116                 default:
1117                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1118                                     timer->card ? timer->card->number : -1,
1119                                     timer->tmr_device, timer->tmr_subdevice);
1120                 }
1121                 snd_iprintf(buffer, "%s :", timer->name);
1122                 if (timer->hw.resolution)
1123                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1124                                     timer->hw.resolution / 1000,
1125                                     timer->hw.resolution % 1000,
1126                                     timer->hw.ticks);
1127                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1128                         snd_iprintf(buffer, " SLAVE");
1129                 snd_iprintf(buffer, "\n");
1130                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1131                         snd_iprintf(buffer, "  Client %s : %s\n",
1132                                     ti->owner ? ti->owner : "unknown",
1133                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1134                                                  SNDRV_TIMER_IFLG_RUNNING)
1135                                     ? "running" : "stopped");
1136         }
1137         mutex_unlock(&register_mutex);
1138 }
1139
1140 static struct snd_info_entry *snd_timer_proc_entry;
1141
1142 static void __init snd_timer_proc_init(void)
1143 {
1144         struct snd_info_entry *entry;
1145
1146         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1147         if (entry != NULL) {
1148                 entry->c.text.read = snd_timer_proc_read;
1149                 if (snd_info_register(entry) < 0) {
1150                         snd_info_free_entry(entry);
1151                         entry = NULL;
1152                 }
1153         }
1154         snd_timer_proc_entry = entry;
1155 }
1156
1157 static void __exit snd_timer_proc_done(void)
1158 {
1159         snd_info_free_entry(snd_timer_proc_entry);
1160 }
1161 #else /* !CONFIG_SND_PROC_FS */
1162 #define snd_timer_proc_init()
1163 #define snd_timer_proc_done()
1164 #endif
1165
1166 /*
1167  *  USER SPACE interface
1168  */
1169
1170 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1171                                      unsigned long resolution,
1172                                      unsigned long ticks)
1173 {
1174         struct snd_timer_user *tu = timeri->callback_data;
1175         struct snd_timer_read *r;
1176         int prev;
1177
1178         spin_lock(&tu->qlock);
1179         if (tu->qused > 0) {
1180                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1181                 r = &tu->queue[prev];
1182                 if (r->resolution == resolution) {
1183                         r->ticks += ticks;
1184                         goto __wake;
1185                 }
1186         }
1187         if (tu->qused >= tu->queue_size) {
1188                 tu->overrun++;
1189         } else {
1190                 r = &tu->queue[tu->qtail++];
1191                 tu->qtail %= tu->queue_size;
1192                 r->resolution = resolution;
1193                 r->ticks = ticks;
1194                 tu->qused++;
1195         }
1196       __wake:
1197         spin_unlock(&tu->qlock);
1198         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1199         wake_up(&tu->qchange_sleep);
1200 }
1201
1202 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1203                                             struct snd_timer_tread *tread)
1204 {
1205         if (tu->qused >= tu->queue_size) {
1206                 tu->overrun++;
1207         } else {
1208                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1209                 tu->qtail %= tu->queue_size;
1210                 tu->qused++;
1211         }
1212 }
1213
1214 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1215                                      int event,
1216                                      struct timespec *tstamp,
1217                                      unsigned long resolution)
1218 {
1219         struct snd_timer_user *tu = timeri->callback_data;
1220         struct snd_timer_tread r1;
1221         unsigned long flags;
1222
1223         if (event >= SNDRV_TIMER_EVENT_START &&
1224             event <= SNDRV_TIMER_EVENT_PAUSE)
1225                 tu->tstamp = *tstamp;
1226         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1227                 return;
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                 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                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1743                         tread.tstamp.tv_sec = 0;
1744                         tread.tstamp.tv_nsec = 0;
1745                         tread.val = 0;
1746                         snd_timer_user_append_to_tqueue(tu, &tread);
1747                 } else {
1748                         struct snd_timer_read *r = &tu->queue[0];
1749                         r->resolution = 0;
1750                         r->ticks = 0;
1751                         tu->qused++;
1752                         tu->qtail++;
1753                 }
1754         }
1755         tu->filter = params.filter;
1756         tu->ticks = params.ticks;
1757         err = 0;
1758  _end:
1759         if (copy_to_user(_params, &params, sizeof(params)))
1760                 return -EFAULT;
1761         return err;
1762 }
1763
1764 static int snd_timer_user_status(struct file *file,
1765                                  struct snd_timer_status __user *_status)
1766 {
1767         struct snd_timer_user *tu;
1768         struct snd_timer_status status;
1769
1770         tu = file->private_data;
1771         if (!tu->timeri)
1772                 return -EBADFD;
1773         memset(&status, 0, sizeof(status));
1774         status.tstamp = tu->tstamp;
1775         status.resolution = snd_timer_resolution(tu->timeri);
1776         status.lost = tu->timeri->lost;
1777         status.overrun = tu->overrun;
1778         spin_lock_irq(&tu->qlock);
1779         status.queue = tu->qused;
1780         spin_unlock_irq(&tu->qlock);
1781         if (copy_to_user(_status, &status, sizeof(status)))
1782                 return -EFAULT;
1783         return 0;
1784 }
1785
1786 static int snd_timer_user_start(struct file *file)
1787 {
1788         int err;
1789         struct snd_timer_user *tu;
1790
1791         tu = file->private_data;
1792         if (!tu->timeri)
1793                 return -EBADFD;
1794         snd_timer_stop(tu->timeri);
1795         tu->timeri->lost = 0;
1796         tu->last_resolution = 0;
1797         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1798 }
1799
1800 static int snd_timer_user_stop(struct file *file)
1801 {
1802         int err;
1803         struct snd_timer_user *tu;
1804
1805         tu = file->private_data;
1806         if (!tu->timeri)
1807                 return -EBADFD;
1808         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1809 }
1810
1811 static int snd_timer_user_continue(struct file *file)
1812 {
1813         int err;
1814         struct snd_timer_user *tu;
1815
1816         tu = file->private_data;
1817         if (!tu->timeri)
1818                 return -EBADFD;
1819         tu->timeri->lost = 0;
1820         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1821 }
1822
1823 static int snd_timer_user_pause(struct file *file)
1824 {
1825         int err;
1826         struct snd_timer_user *tu;
1827
1828         tu = file->private_data;
1829         if (!tu->timeri)
1830                 return -EBADFD;
1831         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1832 }
1833
1834 enum {
1835         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1836         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1837         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1838         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1839 };
1840
1841 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1842                                  unsigned long arg)
1843 {
1844         struct snd_timer_user *tu;
1845         void __user *argp = (void __user *)arg;
1846         int __user *p = argp;
1847
1848         tu = file->private_data;
1849         switch (cmd) {
1850         case SNDRV_TIMER_IOCTL_PVERSION:
1851                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1852         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1853                 return snd_timer_user_next_device(argp);
1854         case SNDRV_TIMER_IOCTL_TREAD:
1855         {
1856                 int xarg;
1857
1858                 if (tu->timeri) /* too late */
1859                         return -EBUSY;
1860                 if (get_user(xarg, p))
1861                         return -EFAULT;
1862                 tu->tread = xarg ? 1 : 0;
1863                 return 0;
1864         }
1865         case SNDRV_TIMER_IOCTL_GINFO:
1866                 return snd_timer_user_ginfo(file, argp);
1867         case SNDRV_TIMER_IOCTL_GPARAMS:
1868                 return snd_timer_user_gparams(file, argp);
1869         case SNDRV_TIMER_IOCTL_GSTATUS:
1870                 return snd_timer_user_gstatus(file, argp);
1871         case SNDRV_TIMER_IOCTL_SELECT:
1872                 return snd_timer_user_tselect(file, argp);
1873         case SNDRV_TIMER_IOCTL_INFO:
1874                 return snd_timer_user_info(file, argp);
1875         case SNDRV_TIMER_IOCTL_PARAMS:
1876                 return snd_timer_user_params(file, argp);
1877         case SNDRV_TIMER_IOCTL_STATUS:
1878                 return snd_timer_user_status(file, argp);
1879         case SNDRV_TIMER_IOCTL_START:
1880         case SNDRV_TIMER_IOCTL_START_OLD:
1881                 return snd_timer_user_start(file);
1882         case SNDRV_TIMER_IOCTL_STOP:
1883         case SNDRV_TIMER_IOCTL_STOP_OLD:
1884                 return snd_timer_user_stop(file);
1885         case SNDRV_TIMER_IOCTL_CONTINUE:
1886         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1887                 return snd_timer_user_continue(file);
1888         case SNDRV_TIMER_IOCTL_PAUSE:
1889         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1890                 return snd_timer_user_pause(file);
1891         }
1892         return -ENOTTY;
1893 }
1894
1895 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1896                                  unsigned long arg)
1897 {
1898         struct snd_timer_user *tu = file->private_data;
1899         long ret;
1900
1901         mutex_lock(&tu->ioctl_lock);
1902         ret = __snd_timer_user_ioctl(file, cmd, arg);
1903         mutex_unlock(&tu->ioctl_lock);
1904         return ret;
1905 }
1906
1907 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1908 {
1909         struct snd_timer_user *tu;
1910
1911         tu = file->private_data;
1912         return fasync_helper(fd, file, on, &tu->fasync);
1913 }
1914
1915 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1916                                    size_t count, loff_t *offset)
1917 {
1918         struct snd_timer_user *tu;
1919         long result = 0, unit;
1920         int qhead;
1921         int err = 0;
1922
1923         tu = file->private_data;
1924         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1925         spin_lock_irq(&tu->qlock);
1926         while ((long)count - result >= unit) {
1927                 while (!tu->qused) {
1928                         wait_queue_t wait;
1929
1930                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1931                                 err = -EAGAIN;
1932                                 goto _error;
1933                         }
1934
1935                         set_current_state(TASK_INTERRUPTIBLE);
1936                         init_waitqueue_entry(&wait, current);
1937                         add_wait_queue(&tu->qchange_sleep, &wait);
1938
1939                         spin_unlock_irq(&tu->qlock);
1940                         schedule();
1941                         spin_lock_irq(&tu->qlock);
1942
1943                         remove_wait_queue(&tu->qchange_sleep, &wait);
1944
1945                         if (tu->disconnected) {
1946                                 err = -ENODEV;
1947                                 goto _error;
1948                         }
1949                         if (signal_pending(current)) {
1950                                 err = -ERESTARTSYS;
1951                                 goto _error;
1952                         }
1953                 }
1954
1955                 qhead = tu->qhead++;
1956                 tu->qhead %= tu->queue_size;
1957                 spin_unlock_irq(&tu->qlock);
1958
1959                 if (tu->tread) {
1960                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1961                                          sizeof(struct snd_timer_tread)))
1962                                 err = -EFAULT;
1963                 } else {
1964                         if (copy_to_user(buffer, &tu->queue[qhead],
1965                                          sizeof(struct snd_timer_read)))
1966                                 err = -EFAULT;
1967                 }
1968
1969                 spin_lock_irq(&tu->qlock);
1970                 tu->qused--;
1971                 if (err < 0)
1972                         goto _error;
1973                 result += unit;
1974                 buffer += unit;
1975         }
1976  _error:
1977         spin_unlock_irq(&tu->qlock);
1978         return result > 0 ? result : err;
1979 }
1980
1981 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1982 {
1983         unsigned int mask;
1984         struct snd_timer_user *tu;
1985
1986         tu = file->private_data;
1987
1988         poll_wait(file, &tu->qchange_sleep, wait);
1989
1990         mask = 0;
1991         if (tu->qused)
1992                 mask |= POLLIN | POLLRDNORM;
1993         if (tu->disconnected)
1994                 mask |= POLLERR;
1995
1996         return mask;
1997 }
1998
1999 #ifdef CONFIG_COMPAT
2000 #include "timer_compat.c"
2001 #else
2002 #define snd_timer_user_ioctl_compat     NULL
2003 #endif
2004
2005 static const struct file_operations snd_timer_f_ops =
2006 {
2007         .owner =        THIS_MODULE,
2008         .read =         snd_timer_user_read,
2009         .open =         snd_timer_user_open,
2010         .release =      snd_timer_user_release,
2011         .llseek =       no_llseek,
2012         .poll =         snd_timer_user_poll,
2013         .unlocked_ioctl =       snd_timer_user_ioctl,
2014         .compat_ioctl = snd_timer_user_ioctl_compat,
2015         .fasync =       snd_timer_user_fasync,
2016 };
2017
2018 /* unregister the system timer */
2019 static void snd_timer_free_all(void)
2020 {
2021         struct snd_timer *timer, *n;
2022
2023         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2024                 snd_timer_free(timer);
2025 }
2026
2027 static struct device timer_dev;
2028
2029 /*
2030  *  ENTRY functions
2031  */
2032
2033 static int __init alsa_timer_init(void)
2034 {
2035         int err;
2036
2037         snd_device_initialize(&timer_dev, NULL);
2038         dev_set_name(&timer_dev, "timer");
2039
2040 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2041         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2042                               "system timer");
2043 #endif
2044
2045         err = snd_timer_register_system();
2046         if (err < 0) {
2047                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2048                 put_device(&timer_dev);
2049                 return err;
2050         }
2051
2052         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2053                                   &snd_timer_f_ops, NULL, &timer_dev);
2054         if (err < 0) {
2055                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2056                 snd_timer_free_all();
2057                 put_device(&timer_dev);
2058                 return err;
2059         }
2060
2061         snd_timer_proc_init();
2062         return 0;
2063 }
2064
2065 static void __exit alsa_timer_exit(void)
2066 {
2067         snd_unregister_device(&timer_dev);
2068         snd_timer_free_all();
2069         put_device(&timer_dev);
2070         snd_timer_proc_done();
2071 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2072         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2073 #endif
2074 }
2075
2076 module_init(alsa_timer_init)
2077 module_exit(alsa_timer_exit)
2078
2079 EXPORT_SYMBOL(snd_timer_open);
2080 EXPORT_SYMBOL(snd_timer_close);
2081 EXPORT_SYMBOL(snd_timer_resolution);
2082 EXPORT_SYMBOL(snd_timer_start);
2083 EXPORT_SYMBOL(snd_timer_stop);
2084 EXPORT_SYMBOL(snd_timer_continue);
2085 EXPORT_SYMBOL(snd_timer_pause);
2086 EXPORT_SYMBOL(snd_timer_new);
2087 EXPORT_SYMBOL(snd_timer_notify);
2088 EXPORT_SYMBOL(snd_timer_global_new);
2089 EXPORT_SYMBOL(snd_timer_global_free);
2090 EXPORT_SYMBOL(snd_timer_global_register);
2091 EXPORT_SYMBOL(snd_timer_interrupt);