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 <linux/sched/signal.h>
  31 #include <sound/core.h>
  32 #include <sound/timer.h>
  33 #include <sound/control.h>
  34 #include <sound/info.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37 #include <linux/kmod.h>
  38
  39 /* internal flags */
  40 #define SNDRV_TIMER_IFLG_PAUSED         0x00010000
  41 #define SNDRV_TIMER_IFLG_DEAD           0x00020000
  42
  43 #if IS_ENABLED(CONFIG_SND_HRTIMER)
  44 #define DEFAULT_TIMER_LIMIT 4
  45 #else
  46 #define DEFAULT_TIMER_LIMIT 1
  47 #endif
  48
  49 static int timer_limit = DEFAULT_TIMER_LIMIT;
  50 static int timer_tstamp_monotonic = 1;
  51 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  52 MODULE_DESCRIPTION("ALSA timer interface");
  53 MODULE_LICENSE("GPL");
  54 module_param(timer_limit, int, 0444);
  55 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  56 module_param(timer_tstamp_monotonic, int, 0444);
  57 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  58
  59 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  60 MODULE_ALIAS("devname:snd/timer");
  61
  62 struct snd_timer_user {
  63         struct snd_timer_instance *timeri;
  64         int tread;              /* enhanced read with timestamps and events */
  65         unsigned long ticks;
  66         unsigned long overrun;
  67         int qhead;
  68         int qtail;
  69         int qused;
  70         int queue_size;
  71         bool disconnected;
  72         struct snd_timer_read *queue;
  73         struct snd_timer_tread *tqueue;
  74         spinlock_t qlock;
  75         unsigned long last_resolution;
  76         unsigned int filter;
  77         struct timespec tstamp;         /* trigger tstamp */
  78         wait_queue_head_t qchange_sleep;
  79         struct fasync_struct *fasync;
  80         struct mutex ioctl_lock;
  81 };
  82
  83 /* list of timers */
  84 static LIST_HEAD(snd_timer_list);
  85
  86 /* list of slave instances */
  87 static LIST_HEAD(snd_timer_slave_list);
  88
  89 /* lock for slave active lists */
  90 static DEFINE_SPINLOCK(slave_active_lock);
  91
  92 static DEFINE_MUTEX(register_mutex);
  93
  94 static int snd_timer_free(struct snd_timer *timer);
  95 static int snd_timer_dev_free(struct snd_device *device);
  96 static int snd_timer_dev_register(struct snd_device *device);
  97 static int snd_timer_dev_disconnect(struct snd_device *device);
  98
  99 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
 100
 101 /*
 102  * create a timer instance with the given owner string.
 103  * when timer is not NULL, increments the module counter
 104  */
 105 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 106                                                          struct snd_timer *timer)
 107 {
 108         struct snd_timer_instance *timeri;
 109         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 110         if (timeri == NULL)
 111                 return NULL;
 112         timeri->owner = kstrdup(owner, GFP_KERNEL);
 113         if (! timeri->owner) {
 114                 kfree(timeri);
 115                 return NULL;
 116         }
 117         INIT_LIST_HEAD(&timeri->open_list);
 118         INIT_LIST_HEAD(&timeri->active_list);
 119         INIT_LIST_HEAD(&timeri->ack_list);
 120         INIT_LIST_HEAD(&timeri->slave_list_head);
 121         INIT_LIST_HEAD(&timeri->slave_active_head);
 122
 123         timeri->timer = timer;
 124         if (timer && !try_module_get(timer->module)) {
 125                 kfree(timeri->owner);
 126                 kfree(timeri);
 127                 return NULL;
 128         }
 129
 130         return timeri;
 131 }
 132
 133 /*
 134  * find a timer instance from the given timer id
 135  */
 136 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 137 {
 138         struct snd_timer *timer = NULL;
 139
 140         list_for_each_entry(timer, &snd_timer_list, device_list) {
 141                 if (timer->tmr_class != tid->dev_class)
 142                         continue;
 143                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 144                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 145                     (timer->card == NULL ||
 146                      timer->card->number != tid->card))
 147                         continue;
 148                 if (timer->tmr_device != tid->device)
 149                         continue;
 150                 if (timer->tmr_subdevice != tid->subdevice)
 151                         continue;
 152                 return timer;
 153         }
 154         return NULL;
 155 }
 156
 157 #ifdef CONFIG_MODULES
 158
 159 static void snd_timer_request(struct snd_timer_id *tid)
 160 {
 161         switch (tid->dev_class) {
 162         case SNDRV_TIMER_CLASS_GLOBAL:
 163                 if (tid->device < timer_limit)
 164                         request_module("snd-timer-%i", tid->device);
 165                 break;
 166         case SNDRV_TIMER_CLASS_CARD:
 167         case SNDRV_TIMER_CLASS_PCM:
 168                 if (tid->card < snd_ecards_limit)
 169                         request_module("snd-card-%i", tid->card);
 170                 break;
 171         default:
 172                 break;
 173         }
 174 }
 175
 176 #endif
 177
 178 /*
 179  * look for a master instance matching with the slave id of the given slave.
 180  * when found, relink the open_link of the slave.
 181  *
 182  * call this with register_mutex down.
 183  */
 184 static int snd_timer_check_slave(struct snd_timer_instance *slave)
 185 {
 186         struct snd_timer *timer;
 187         struct snd_timer_instance *master;
 188
 189         /* FIXME: it's really dumb to look up all entries.. */
 190         list_for_each_entry(timer, &snd_timer_list, device_list) {
 191                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 192                         if (slave->slave_class == master->slave_class &&
 193                             slave->slave_id == master->slave_id) {
 194                                 if (master->timer->num_instances >=
 195                                     master->timer->max_instances)
 196                                         return -EBUSY;
 197                                 list_move_tail(&slave->open_list,
 198                                                &master->slave_list_head);
 199                                 master->timer->num_instances++;
 200                                 spin_lock_irq(&slave_active_lock);
 201                                 slave->master = master;
 202                                 slave->timer = master->timer;
 203                                 spin_unlock_irq(&slave_active_lock);
 204                                 return 0;
 205                         }
 206                 }
 207         }
 208         return 0;
 209 }
 210
 211 /*
 212  * look for slave instances matching with the slave id of the given master.
 213  * when found, relink the open_link of slaves.
 214  *
 215  * call this with register_mutex down.
 216  */
 217 static int snd_timer_check_master(struct snd_timer_instance *master)
 218 {
 219         struct snd_timer_instance *slave, *tmp;
 220
 221         /* check all pending slaves */
 222         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 223                 if (slave->slave_class == master->slave_class &&
 224                     slave->slave_id == master->slave_id) {
 225                         if (master->timer->num_instances >=
 226                             master->timer->max_instances)
 227                                 return -EBUSY;
 228                         list_move_tail(&slave->open_list, &master->slave_list_head);
 229                         master->timer->num_instances++;
 230                         spin_lock_irq(&slave_active_lock);
 231                         spin_lock(&master->timer->lock);
 232                         slave->master = master;
 233                         slave->timer = master->timer;
 234                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 235                                 list_add_tail(&slave->active_list,
 236                                               &master->slave_active_head);
 237                         spin_unlock(&master->timer->lock);
 238                         spin_unlock_irq(&slave_active_lock);
 239                 }
 240         }
 241         return 0;
 242 }
 243
 244 static int snd_timer_close_locked(struct snd_timer_instance *timeri);
 245
 246 /*
 247  * open a timer instance
 248  * when opening a master, the slave id must be here given.
 249  */
 250 int snd_timer_open(struct snd_timer_instance **ti,
 251                    char *owner, struct snd_timer_id *tid,
 252                    unsigned int slave_id)
 253 {
 254         struct snd_timer *timer;
 255         struct snd_timer_instance *timeri = NULL;
 256         int err;
 257
 258         mutex_lock(&register_mutex);
 259         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 260                 /* open a slave instance */
 261                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 262                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 263                         pr_debug("ALSA: timer: invalid slave class %i\n",
 264                                  tid->dev_sclass);
 265                         err = -EINVAL;
 266                         goto unlock;
 267                 }
 268                 timeri = snd_timer_instance_new(owner, NULL);
 269                 if (!timeri) {
 270                         err = -ENOMEM;
 271                         goto unlock;
 272                 }
 273                 timeri->slave_class = tid->dev_sclass;
 274                 timeri->slave_id = tid->device;
 275                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 276                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 277                 err = snd_timer_check_slave(timeri);
 278                 if (err < 0) {
 279                         snd_timer_close_locked(timeri);
 280                         timeri = NULL;
 281                 }
 282                 goto unlock;
 283         }
 284
 285         /* open a master instance */
 286         timer = snd_timer_find(tid);
 287 #ifdef CONFIG_MODULES
 288         if (!timer) {
 289                 mutex_unlock(&register_mutex);
 290                 snd_timer_request(tid);
 291                 mutex_lock(&register_mutex);
 292                 timer = snd_timer_find(tid);
 293         }
 294 #endif
 295         if (!timer) {
 296                 err = -ENODEV;
 297                 goto unlock;
 298         }
 299         if (!list_empty(&timer->open_list_head)) {
 300                 timeri = list_entry(timer->open_list_head.next,
 301                                     struct snd_timer_instance, open_list);
 302                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 303                         err = -EBUSY;
 304                         timeri = NULL;
 305                         goto unlock;
 306                 }
 307         }
 308         if (timer->num_instances >= timer->max_instances) {
 309                 err = -EBUSY;
 310                 goto unlock;
 311         }
 312         timeri = snd_timer_instance_new(owner, timer);
 313         if (!timeri) {
 314                 err = -ENOMEM;
 315                 goto unlock;
 316         }
 317         /* take a card refcount for safe disconnection */
 318         if (timer->card)
 319                 get_device(&timer->card->card_dev);
 320         timeri->slave_class = tid->dev_sclass;
 321         timeri->slave_id = slave_id;
 322
 323         if (list_empty(&timer->open_list_head) && timer->hw.open) {
 324                 err = timer->hw.open(timer);
 325                 if (err) {
 326                         kfree(timeri->owner);
 327                         kfree(timeri);
 328                         timeri = NULL;
 329
 330                         if (timer->card)
 331                                 put_device(&timer->card->card_dev);
 332                         module_put(timer->module);
 333                         goto unlock;
 334                 }
 335         }
 336
 337         list_add_tail(&timeri->open_list, &timer->open_list_head);
 338         timer->num_instances++;
 339         err = snd_timer_check_master(timeri);
 340         if (err < 0) {
 341                 snd_timer_close_locked(timeri);
 342                 timeri = NULL;
 343         }
 344
 345  unlock:
 346         mutex_unlock(&register_mutex);
 347         *ti = timeri;
 348         return err;
 349 }
 350 EXPORT_SYMBOL(snd_timer_open);
 351
 352 /*
 353  * close a timer instance
 354  * call this with register_mutex down.
 355  */
 356 static int snd_timer_close_locked(struct snd_timer_instance *timeri)
 357 {
 358         struct snd_timer *timer = timeri->timer;
 359         struct snd_timer_instance *slave, *tmp;
 360
 361         if (timer) {
 362                 spin_lock_irq(&timer->lock);
 363                 timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
 364                 spin_unlock_irq(&timer->lock);
 365         }
 366
 367         list_del(&timeri->open_list);
 368
 369         /* force to stop the timer */
 370         snd_timer_stop(timeri);
 371
 372         if (timer) {
 373                 timer->num_instances--;
 374                 /* wait, until the active callback is finished */
 375                 spin_lock_irq(&timer->lock);
 376                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 377                         spin_unlock_irq(&timer->lock);
 378                         udelay(10);
 379                         spin_lock_irq(&timer->lock);
 380                 }
 381                 spin_unlock_irq(&timer->lock);
 382
 383                 /* remove slave links */
 384                 spin_lock_irq(&slave_active_lock);
 385                 spin_lock(&timer->lock);
 386                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 387                                          open_list) {
 388                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 389                         timer->num_instances--;
 390                         slave->master = NULL;
 391                         slave->timer = NULL;
 392                         list_del_init(&slave->ack_list);
 393                         list_del_init(&slave->active_list);
 394                 }
 395                 spin_unlock(&timer->lock);
 396                 spin_unlock_irq(&slave_active_lock);
 397
 398                 /* slave doesn't need to release timer resources below */
 399                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 400                         timer = NULL;
 401         }
 402
 403         if (timeri->private_free)
 404                 timeri->private_free(timeri);
 405         kfree(timeri->owner);
 406         kfree(timeri);
 407
 408         if (timer) {
 409                 if (list_empty(&timer->open_list_head) && timer->hw.close)
 410                         timer->hw.close(timer);
 411                 /* release a card refcount for safe disconnection */
 412                 if (timer->card)
 413                         put_device(&timer->card->card_dev);
 414                 module_put(timer->module);
 415         }
 416
 417         return 0;
 418 }
 419
 420 /*
 421  * close a timer instance
 422  */
 423 int snd_timer_close(struct snd_timer_instance *timeri)
 424 {
 425         int err;
 426
 427         if (snd_BUG_ON(!timeri))
 428                 return -ENXIO;
 429
 430         mutex_lock(&register_mutex);
 431         err = snd_timer_close_locked(timeri);
 432         mutex_unlock(&register_mutex);
 433         return err;
 434 }
 435 EXPORT_SYMBOL(snd_timer_close);
 436
 437 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
 438 {
 439         if (timer->hw.c_resolution)
 440                 return timer->hw.c_resolution(timer);
 441         else
 442                 return timer->hw.resolution;
 443 }
 444
 445 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 446 {
 447         struct snd_timer * timer;
 448         unsigned long ret = 0;
 449         unsigned long flags;
 450
 451         if (timeri == NULL)
 452                 return 0;
 453         timer = timeri->timer;
 454         if (timer) {
 455                 spin_lock_irqsave(&timer->lock, flags);
 456                 ret = snd_timer_hw_resolution(timer);
 457                 spin_unlock_irqrestore(&timer->lock, flags);
 458         }
 459         return ret;
 460 }
 461 EXPORT_SYMBOL(snd_timer_resolution);
 462
 463 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 464 {
 465         struct snd_timer *timer = ti->timer;
 466         unsigned long resolution = 0;
 467         struct snd_timer_instance *ts;
 468         struct timespec tstamp;
 469
 470         if (timer_tstamp_monotonic)
 471                 ktime_get_ts(&tstamp);
 472         else
 473                 getnstimeofday(&tstamp);
 474         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 475                        event > SNDRV_TIMER_EVENT_PAUSE))
 476                 return;
 477         if (timer &&
 478             (event == SNDRV_TIMER_EVENT_START ||
 479              event == SNDRV_TIMER_EVENT_CONTINUE))
 480                 resolution = snd_timer_hw_resolution(timer);
 481         if (ti->ccallback)
 482                 ti->ccallback(ti, event, &tstamp, resolution);
 483         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 484                 return;
 485         if (timer == NULL)
 486                 return;
 487         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 488                 return;
 489         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 490                 if (ts->ccallback)
 491                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 492 }
 493
 494 /* start/continue a master timer */
 495 static int snd_timer_start1(struct snd_timer_instance *timeri,
 496                             bool start, unsigned long ticks)
 497 {
 498         struct snd_timer *timer;
 499         int result;
 500         unsigned long flags;
 501
 502         timer = timeri->timer;
 503         if (!timer)
 504                 return -EINVAL;
 505
 506         spin_lock_irqsave(&timer->lock, flags);
 507         if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
 508                 result = -EINVAL;
 509                 goto unlock;
 510         }
 511         if (timer->card && timer->card->shutdown) {
 512                 result = -ENODEV;
 513                 goto unlock;
 514         }
 515         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 516                              SNDRV_TIMER_IFLG_START)) {
 517                 result = -EBUSY;
 518                 goto unlock;
 519         }
 520
 521         if (start)
 522                 timeri->ticks = timeri->cticks = ticks;
 523         else if (!timeri->cticks)
 524                 timeri->cticks = 1;
 525         timeri->pticks = 0;
 526
 527         list_move_tail(&timeri->active_list, &timer->active_list_head);
 528         if (timer->running) {
 529                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 530                         goto __start_now;
 531                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 532                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 533                 result = 1; /* delayed start */
 534         } else {
 535                 if (start)
 536                         timer->sticks = ticks;
 537                 timer->hw.start(timer);
 538               __start_now:
 539                 timer->running++;
 540                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 541                 result = 0;
 542         }
 543         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 544                           SNDRV_TIMER_EVENT_CONTINUE);
 545  unlock:
 546         spin_unlock_irqrestore(&timer->lock, flags);
 547         return result;
 548 }
 549
 550 /* start/continue a slave timer */
 551 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
 552                                  bool start)
 553 {
 554         unsigned long flags;
 555         int err;
 556
 557         spin_lock_irqsave(&slave_active_lock, flags);
 558         if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
 559                 err = -EINVAL;
 560                 goto unlock;
 561         }
 562         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 563                 err = -EBUSY;
 564                 goto unlock;
 565         }
 566         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 567         if (timeri->master && timeri->timer) {
 568                 spin_lock(&timeri->timer->lock);
 569                 list_add_tail(&timeri->active_list,
 570                               &timeri->master->slave_active_head);
 571                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 572                                   SNDRV_TIMER_EVENT_CONTINUE);
 573                 spin_unlock(&timeri->timer->lock);
 574         }
 575         err = 1; /* delayed start */
 576  unlock:
 577         spin_unlock_irqrestore(&slave_active_lock, flags);
 578         return err;
 579 }
 580
 581 /* stop/pause a master timer */
 582 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
 583 {
 584         struct snd_timer *timer;
 585         int result = 0;
 586         unsigned long flags;
 587
 588         timer = timeri->timer;
 589         if (!timer)
 590                 return -EINVAL;
 591         spin_lock_irqsave(&timer->lock, flags);
 592         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 593                                SNDRV_TIMER_IFLG_START))) {
 594                 result = -EBUSY;
 595                 goto unlock;
 596         }
 597         list_del_init(&timeri->ack_list);
 598         list_del_init(&timeri->active_list);
 599         if (timer->card && timer->card->shutdown)
 600                 goto unlock;
 601         if (stop) {
 602                 timeri->cticks = timeri->ticks;
 603                 timeri->pticks = 0;
 604         }
 605         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 606             !(--timer->running)) {
 607                 timer->hw.stop(timer);
 608                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 609                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 610                         snd_timer_reschedule(timer, 0);
 611                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 612                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 613                                 timer->hw.start(timer);
 614                         }
 615                 }
 616         }
 617         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 618         if (stop)
 619                 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
 620         else
 621                 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
 622         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 623                           SNDRV_TIMER_EVENT_PAUSE);
 624  unlock:
 625         spin_unlock_irqrestore(&timer->lock, flags);
 626         return result;
 627 }
 628
 629 /* stop/pause a slave timer */
 630 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
 631 {
 632         unsigned long flags;
 633
 634         spin_lock_irqsave(&slave_active_lock, flags);
 635         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 636                 spin_unlock_irqrestore(&slave_active_lock, flags);
 637                 return -EBUSY;
 638         }
 639         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 640         if (timeri->timer) {
 641                 spin_lock(&timeri->timer->lock);
 642                 list_del_init(&timeri->ack_list);
 643                 list_del_init(&timeri->active_list);
 644                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 645                                   SNDRV_TIMER_EVENT_PAUSE);
 646                 spin_unlock(&timeri->timer->lock);
 647         }
 648         spin_unlock_irqrestore(&slave_active_lock, flags);
 649         return 0;
 650 }
 651
 652 /*
 653  *  start the timer instance
 654  */
 655 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 656 {
 657         if (timeri == NULL || ticks < 1)
 658                 return -EINVAL;
 659         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 660                 return snd_timer_start_slave(timeri, true);
 661         else
 662                 return snd_timer_start1(timeri, true, ticks);
 663 }
 664 EXPORT_SYMBOL(snd_timer_start);
 665
 666 /*
 667  * stop the timer instance.
 668  *
 669  * do not call this from the timer callback!
 670  */
 671 int snd_timer_stop(struct snd_timer_instance *timeri)
 672 {
 673         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 674                 return snd_timer_stop_slave(timeri, true);
 675         else
 676                 return snd_timer_stop1(timeri, true);
 677 }
 678 EXPORT_SYMBOL(snd_timer_stop);
 679
 680 /*
 681  * start again..  the tick is kept.
 682  */
 683 int snd_timer_continue(struct snd_timer_instance *timeri)
 684 {
 685         /* timer can continue only after pause */
 686         if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
 687                 return -EINVAL;
 688
 689         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 690                 return snd_timer_start_slave(timeri, false);
 691         else
 692                 return snd_timer_start1(timeri, false, 0);
 693 }
 694 EXPORT_SYMBOL(snd_timer_continue);
 695
 696 /*
 697  * pause.. remember the ticks left
 698  */
 699 int snd_timer_pause(struct snd_timer_instance * timeri)
 700 {
 701         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 702                 return snd_timer_stop_slave(timeri, false);
 703         else
 704                 return snd_timer_stop1(timeri, false);
 705 }
 706 EXPORT_SYMBOL(snd_timer_pause);
 707
 708 /*
 709  * reschedule the timer
 710  *
 711  * start pending instances and check the scheduling ticks.
 712  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 713  */
 714 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 715 {
 716         struct snd_timer_instance *ti;
 717         unsigned long ticks = ~0UL;
 718
 719         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 720                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 721                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 722                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 723                         timer->running++;
 724                 }
 725                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 726                         if (ticks > ti->cticks)
 727                                 ticks = ti->cticks;
 728                 }
 729         }
 730         if (ticks == ~0UL) {
 731                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 732                 return;
 733         }
 734         if (ticks > timer->hw.ticks)
 735                 ticks = timer->hw.ticks;
 736         if (ticks_left != ticks)
 737                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 738         timer->sticks = ticks;
 739 }
 740
 741 /* call callbacks in timer ack list */
 742 static void snd_timer_process_callbacks(struct snd_timer *timer,
 743                                         struct list_head *head)
 744 {
 745         struct snd_timer_instance *ti;
 746         unsigned long resolution, ticks;
 747
 748         while (!list_empty(head)) {
 749                 ti = list_first_entry(head, struct snd_timer_instance,
 750                                       ack_list);
 751
 752                 /* remove from ack_list and make empty */
 753                 list_del_init(&ti->ack_list);
 754
 755                 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
 756                         ticks = ti->pticks;
 757                         ti->pticks = 0;
 758                         resolution = ti->resolution;
 759                         ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 760                         spin_unlock(&timer->lock);
 761                         if (ti->callback)
 762                                 ti->callback(ti, resolution, ticks);
 763                         spin_lock(&timer->lock);
 764                         ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 765                 }
 766         }
 767 }
 768
 769 /* clear pending instances from ack list */
 770 static void snd_timer_clear_callbacks(struct snd_timer *timer,
 771                                       struct list_head *head)
 772 {
 773         unsigned long flags;
 774
 775         spin_lock_irqsave(&timer->lock, flags);
 776         while (!list_empty(head))
 777                 list_del_init(head->next);
 778         spin_unlock_irqrestore(&timer->lock, flags);
 779 }
 780
 781 /*
 782  * timer tasklet
 783  *
 784  */
 785 static void snd_timer_tasklet(unsigned long arg)
 786 {
 787         struct snd_timer *timer = (struct snd_timer *) arg;
 788         unsigned long flags;
 789
 790         if (timer->card && timer->card->shutdown) {
 791                 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
 792                 return;
 793         }
 794
 795         spin_lock_irqsave(&timer->lock, flags);
 796         snd_timer_process_callbacks(timer, &timer->sack_list_head);
 797         spin_unlock_irqrestore(&timer->lock, flags);
 798 }
 799
 800 /*
 801  * timer interrupt
 802  *
 803  * ticks_left is usually equal to timer->sticks.
 804  *
 805  */
 806 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 807 {
 808         struct snd_timer_instance *ti, *ts, *tmp;
 809         unsigned long resolution;
 810         struct list_head *ack_list_head;
 811         unsigned long flags;
 812         int use_tasklet = 0;
 813
 814         if (timer == NULL)
 815                 return;
 816
 817         if (timer->card && timer->card->shutdown) {
 818                 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
 819                 return;
 820         }
 821
 822         spin_lock_irqsave(&timer->lock, flags);
 823
 824         /* remember the current resolution */
 825         resolution = snd_timer_hw_resolution(timer);
 826
 827         /* loop for all active instances
 828          * Here we cannot use list_for_each_entry because the active_list of a
 829          * processed instance is relinked to done_list_head before the callback
 830          * is called.
 831          */
 832         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 833                                  active_list) {
 834                 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
 835                         continue;
 836                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 837                         continue;
 838                 ti->pticks += ticks_left;
 839                 ti->resolution = resolution;
 840                 if (ti->cticks < ticks_left)
 841                         ti->cticks = 0;
 842                 else
 843                         ti->cticks -= ticks_left;
 844                 if (ti->cticks) /* not expired */
 845                         continue;
 846                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 847                         ti->cticks = ti->ticks;
 848                 } else {
 849                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 850                         --timer->running;
 851                         list_del_init(&ti->active_list);
 852                 }
 853                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 854                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 855                         ack_list_head = &timer->ack_list_head;
 856                 else
 857                         ack_list_head = &timer->sack_list_head;
 858                 if (list_empty(&ti->ack_list))
 859                         list_add_tail(&ti->ack_list, ack_list_head);
 860                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 861                         ts->pticks = ti->pticks;
 862                         ts->resolution = resolution;
 863                         if (list_empty(&ts->ack_list))
 864                                 list_add_tail(&ts->ack_list, ack_list_head);
 865                 }
 866         }
 867         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 868                 snd_timer_reschedule(timer, timer->sticks);
 869         if (timer->running) {
 870                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 871                         timer->hw.stop(timer);
 872                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 873                 }
 874                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 875                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 876                         /* restart timer */
 877                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 878                         timer->hw.start(timer);
 879                 }
 880         } else {
 881                 timer->hw.stop(timer);
 882         }
 883
 884         /* now process all fast callbacks */
 885         snd_timer_process_callbacks(timer, &timer->ack_list_head);
 886
 887         /* do we have any slow callbacks? */
 888         use_tasklet = !list_empty(&timer->sack_list_head);
 889         spin_unlock_irqrestore(&timer->lock, flags);
 890
 891         if (use_tasklet)
 892                 tasklet_schedule(&timer->task_queue);
 893 }
 894 EXPORT_SYMBOL(snd_timer_interrupt);
 895
 896 /*
 897
 898  */
 899
 900 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 901                   struct snd_timer **rtimer)
 902 {
 903         struct snd_timer *timer;
 904         int err;
 905         static struct snd_device_ops ops = {
 906                 .dev_free = snd_timer_dev_free,
 907                 .dev_register = snd_timer_dev_register,
 908                 .dev_disconnect = snd_timer_dev_disconnect,
 909         };
 910
 911         if (snd_BUG_ON(!tid))
 912                 return -EINVAL;
 913         if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
 914             tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
 915                 if (WARN_ON(!card))
 916                         return -EINVAL;
 917         }
 918         if (rtimer)
 919                 *rtimer = NULL;
 920         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 921         if (!timer)
 922                 return -ENOMEM;
 923         timer->tmr_class = tid->dev_class;
 924         timer->card = card;
 925         timer->tmr_device = tid->device;
 926         timer->tmr_subdevice = tid->subdevice;
 927         if (id)
 928                 strlcpy(timer->id, id, sizeof(timer->id));
 929         timer->sticks = 1;
 930         INIT_LIST_HEAD(&timer->device_list);
 931         INIT_LIST_HEAD(&timer->open_list_head);
 932         INIT_LIST_HEAD(&timer->active_list_head);
 933         INIT_LIST_HEAD(&timer->ack_list_head);
 934         INIT_LIST_HEAD(&timer->sack_list_head);
 935         spin_lock_init(&timer->lock);
 936         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 937                      (unsigned long)timer);
 938         timer->max_instances = 1000; /* default limit per timer */
 939         if (card != NULL) {
 940                 timer->module = card->module;
 941                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 942                 if (err < 0) {
 943                         snd_timer_free(timer);
 944                         return err;
 945                 }
 946         }
 947         if (rtimer)
 948                 *rtimer = timer;
 949         return 0;
 950 }
 951 EXPORT_SYMBOL(snd_timer_new);
 952
 953 static int snd_timer_free(struct snd_timer *timer)
 954 {
 955         if (!timer)
 956                 return 0;
 957
 958         mutex_lock(&register_mutex);
 959         if (! list_empty(&timer->open_list_head)) {
 960                 struct list_head *p, *n;
 961                 struct snd_timer_instance *ti;
 962                 pr_warn("ALSA: timer %p is busy?\n", timer);
 963                 list_for_each_safe(p, n, &timer->open_list_head) {
 964                         list_del_init(p);
 965                         ti = list_entry(p, struct snd_timer_instance, open_list);
 966                         ti->timer = NULL;
 967                 }
 968         }
 969         list_del(&timer->device_list);
 970         mutex_unlock(&register_mutex);
 971
 972         if (timer->private_free)
 973                 timer->private_free(timer);
 974         kfree(timer);
 975         return 0;
 976 }
 977
 978 static int snd_timer_dev_free(struct snd_device *device)
 979 {
 980         struct snd_timer *timer = device->device_data;
 981         return snd_timer_free(timer);
 982 }
 983
 984 static int snd_timer_dev_register(struct snd_device *dev)
 985 {
 986         struct snd_timer *timer = dev->device_data;
 987         struct snd_timer *timer1;
 988
 989         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 990                 return -ENXIO;
 991         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 992             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 993                 return -EINVAL;
 994
 995         mutex_lock(&register_mutex);
 996         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 997                 if (timer1->tmr_class > timer->tmr_class)
 998                         break;
 999                 if (timer1->tmr_class < timer->tmr_class)
1000                         continue;
1001                 if (timer1->card && timer->card) {
1002                         if (timer1->card->number > timer->card->number)
1003                                 break;
1004                         if (timer1->card->number < timer->card->number)
1005                                 continue;
1006                 }
1007                 if (timer1->tmr_device > timer->tmr_device)
1008                         break;
1009                 if (timer1->tmr_device < timer->tmr_device)
1010                         continue;
1011                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
1012                         break;
1013                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
1014                         continue;
1015                 /* conflicts.. */
1016                 mutex_unlock(&register_mutex);
1017                 return -EBUSY;
1018         }
1019         list_add_tail(&timer->device_list, &timer1->device_list);
1020         mutex_unlock(&register_mutex);
1021         return 0;
1022 }
1023
1024 static int snd_timer_dev_disconnect(struct snd_device *device)
1025 {
1026         struct snd_timer *timer = device->device_data;
1027         struct snd_timer_instance *ti;
1028
1029         mutex_lock(&register_mutex);
1030         list_del_init(&timer->device_list);
1031         /* wake up pending sleepers */
1032         list_for_each_entry(ti, &timer->open_list_head, open_list) {
1033                 if (ti->disconnect)
1034                         ti->disconnect(ti);
1035         }
1036         mutex_unlock(&register_mutex);
1037         return 0;
1038 }
1039
1040 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1041 {
1042         unsigned long flags;
1043         unsigned long resolution = 0;
1044         struct snd_timer_instance *ti, *ts;
1045
1046         if (timer->card && timer->card->shutdown)
1047                 return;
1048         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1049                 return;
1050         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1051                        event > SNDRV_TIMER_EVENT_MRESUME))
1052                 return;
1053         spin_lock_irqsave(&timer->lock, flags);
1054         if (event == SNDRV_TIMER_EVENT_MSTART ||
1055             event == SNDRV_TIMER_EVENT_MCONTINUE ||
1056             event == SNDRV_TIMER_EVENT_MRESUME)
1057                 resolution = snd_timer_hw_resolution(timer);
1058         list_for_each_entry(ti, &timer->active_list_head, active_list) {
1059                 if (ti->ccallback)
1060                         ti->ccallback(ti, event, tstamp, resolution);
1061                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1062                         if (ts->ccallback)
1063                                 ts->ccallback(ts, event, tstamp, resolution);
1064         }
1065         spin_unlock_irqrestore(&timer->lock, flags);
1066 }
1067 EXPORT_SYMBOL(snd_timer_notify);
1068
1069 /*
1070  * exported functions for global timers
1071  */
1072 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1073 {
1074         struct snd_timer_id tid;
1075
1076         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1077         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1078         tid.card = -1;
1079         tid.device = device;
1080         tid.subdevice = 0;
1081         return snd_timer_new(NULL, id, &tid, rtimer);
1082 }
1083 EXPORT_SYMBOL(snd_timer_global_new);
1084
1085 int snd_timer_global_free(struct snd_timer *timer)
1086 {
1087         return snd_timer_free(timer);
1088 }
1089 EXPORT_SYMBOL(snd_timer_global_free);
1090
1091 int snd_timer_global_register(struct snd_timer *timer)
1092 {
1093         struct snd_device dev;
1094
1095         memset(&dev, 0, sizeof(dev));
1096         dev.device_data = timer;
1097         return snd_timer_dev_register(&dev);
1098 }
1099 EXPORT_SYMBOL(snd_timer_global_register);
1100
1101 /*
1102  *  System timer
1103  */
1104
1105 struct snd_timer_system_private {
1106         struct timer_list tlist;
1107         struct snd_timer *snd_timer;
1108         unsigned long last_expires;
1109         unsigned long last_jiffies;
1110         unsigned long correction;
1111 };
1112
1113 static void snd_timer_s_function(struct timer_list *t)
1114 {
1115         struct snd_timer_system_private *priv = from_timer(priv, t,
1116                                                                 tlist);
1117         struct snd_timer *timer = priv->snd_timer;
1118         unsigned long jiff = jiffies;
1119         if (time_after(jiff, priv->last_expires))
1120                 priv->correction += (long)jiff - (long)priv->last_expires;
1121         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1122 }
1123
1124 static int snd_timer_s_start(struct snd_timer * timer)
1125 {
1126         struct snd_timer_system_private *priv;
1127         unsigned long njiff;
1128
1129         priv = (struct snd_timer_system_private *) timer->private_data;
1130         njiff = (priv->last_jiffies = jiffies);
1131         if (priv->correction > timer->sticks - 1) {
1132                 priv->correction -= timer->sticks - 1;
1133                 njiff++;
1134         } else {
1135                 njiff += timer->sticks - priv->correction;
1136                 priv->correction = 0;
1137         }
1138         priv->last_expires = njiff;
1139         mod_timer(&priv->tlist, njiff);
1140         return 0;
1141 }
1142
1143 static int snd_timer_s_stop(struct snd_timer * timer)
1144 {
1145         struct snd_timer_system_private *priv;
1146         unsigned long jiff;
1147
1148         priv = (struct snd_timer_system_private *) timer->private_data;
1149         del_timer(&priv->tlist);
1150         jiff = jiffies;
1151         if (time_before(jiff, priv->last_expires))
1152                 timer->sticks = priv->last_expires - jiff;
1153         else
1154                 timer->sticks = 1;
1155         priv->correction = 0;
1156         return 0;
1157 }
1158
1159 static int snd_timer_s_close(struct snd_timer *timer)
1160 {
1161         struct snd_timer_system_private *priv;
1162
1163         priv = (struct snd_timer_system_private *)timer->private_data;
1164         del_timer_sync(&priv->tlist);
1165         return 0;
1166 }
1167
1168 static struct snd_timer_hardware snd_timer_system =
1169 {
1170         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1171         .resolution =   1000000000L / HZ,
1172         .ticks =        10000000L,
1173         .close =        snd_timer_s_close,
1174         .start =        snd_timer_s_start,
1175         .stop =         snd_timer_s_stop
1176 };
1177
1178 static void snd_timer_free_system(struct snd_timer *timer)
1179 {
1180         kfree(timer->private_data);
1181 }
1182
1183 static int snd_timer_register_system(void)
1184 {
1185         struct snd_timer *timer;
1186         struct snd_timer_system_private *priv;
1187         int err;
1188
1189         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1190         if (err < 0)
1191                 return err;
1192         strcpy(timer->name, "system timer");
1193         timer->hw = snd_timer_system;
1194         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1195         if (priv == NULL) {
1196                 snd_timer_free(timer);
1197                 return -ENOMEM;
1198         }
1199         priv->snd_timer = timer;
1200         timer_setup(&priv->tlist, snd_timer_s_function, 0);
1201         timer->private_data = priv;
1202         timer->private_free = snd_timer_free_system;
1203         return snd_timer_global_register(timer);
1204 }
1205
1206 #ifdef CONFIG_SND_PROC_FS
1207 /*
1208  *  Info interface
1209  */
1210
1211 static void snd_timer_proc_read(struct snd_info_entry *entry,
1212                                 struct snd_info_buffer *buffer)
1213 {
1214         struct snd_timer *timer;
1215         struct snd_timer_instance *ti;
1216
1217         mutex_lock(&register_mutex);
1218         list_for_each_entry(timer, &snd_timer_list, device_list) {
1219                 if (timer->card && timer->card->shutdown)
1220                         continue;
1221                 switch (timer->tmr_class) {
1222                 case SNDRV_TIMER_CLASS_GLOBAL:
1223                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1224                         break;
1225                 case SNDRV_TIMER_CLASS_CARD:
1226                         snd_iprintf(buffer, "C%i-%i: ",
1227                                     timer->card->number, timer->tmr_device);
1228                         break;
1229                 case SNDRV_TIMER_CLASS_PCM:
1230                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1231                                     timer->tmr_device, timer->tmr_subdevice);
1232                         break;
1233                 default:
1234                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1235                                     timer->card ? timer->card->number : -1,
1236                                     timer->tmr_device, timer->tmr_subdevice);
1237                 }
1238                 snd_iprintf(buffer, "%s :", timer->name);
1239                 if (timer->hw.resolution)
1240                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1241                                     timer->hw.resolution / 1000,
1242                                     timer->hw.resolution % 1000,
1243                                     timer->hw.ticks);
1244                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1245                         snd_iprintf(buffer, " SLAVE");
1246                 snd_iprintf(buffer, "\n");
1247                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1248                         snd_iprintf(buffer, "  Client %s : %s\n",
1249                                     ti->owner ? ti->owner : "unknown",
1250                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1251                                                  SNDRV_TIMER_IFLG_RUNNING)
1252                                     ? "running" : "stopped");
1253         }
1254         mutex_unlock(&register_mutex);
1255 }
1256
1257 static struct snd_info_entry *snd_timer_proc_entry;
1258
1259 static void __init snd_timer_proc_init(void)
1260 {
1261         struct snd_info_entry *entry;
1262
1263         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1264         if (entry != NULL) {
1265                 entry->c.text.read = snd_timer_proc_read;
1266                 if (snd_info_register(entry) < 0) {
1267                         snd_info_free_entry(entry);
1268                         entry = NULL;
1269                 }
1270         }
1271         snd_timer_proc_entry = entry;
1272 }
1273
1274 static void __exit snd_timer_proc_done(void)
1275 {
1276         snd_info_free_entry(snd_timer_proc_entry);
1277 }
1278 #else /* !CONFIG_SND_PROC_FS */
1279 #define snd_timer_proc_init()
1280 #define snd_timer_proc_done()
1281 #endif
1282
1283 /*
1284  *  USER SPACE interface
1285  */
1286
1287 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1288                                      unsigned long resolution,
1289                                      unsigned long ticks)
1290 {
1291         struct snd_timer_user *tu = timeri->callback_data;
1292         struct snd_timer_read *r;
1293         int prev;
1294
1295         spin_lock(&tu->qlock);
1296         if (tu->qused > 0) {
1297                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1298                 r = &tu->queue[prev];
1299                 if (r->resolution == resolution) {
1300                         r->ticks += ticks;
1301                         goto __wake;
1302                 }
1303         }
1304         if (tu->qused >= tu->queue_size) {
1305                 tu->overrun++;
1306         } else {
1307                 r = &tu->queue[tu->qtail++];
1308                 tu->qtail %= tu->queue_size;
1309                 r->resolution = resolution;
1310                 r->ticks = ticks;
1311                 tu->qused++;
1312         }
1313       __wake:
1314         spin_unlock(&tu->qlock);
1315         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1316         wake_up(&tu->qchange_sleep);
1317 }
1318
1319 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1320                                             struct snd_timer_tread *tread)
1321 {
1322         if (tu->qused >= tu->queue_size) {
1323                 tu->overrun++;
1324         } else {
1325                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1326                 tu->qtail %= tu->queue_size;
1327                 tu->qused++;
1328         }
1329 }
1330
1331 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1332                                      int event,
1333                                      struct timespec *tstamp,
1334                                      unsigned long resolution)
1335 {
1336         struct snd_timer_user *tu = timeri->callback_data;
1337         struct snd_timer_tread r1;
1338         unsigned long flags;
1339
1340         if (event >= SNDRV_TIMER_EVENT_START &&
1341             event <= SNDRV_TIMER_EVENT_PAUSE)
1342                 tu->tstamp = *tstamp;
1343         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1344                 return;
1345         memset(&r1, 0, sizeof(r1));
1346         r1.event = event;
1347         r1.tstamp = *tstamp;
1348         r1.val = resolution;
1349         spin_lock_irqsave(&tu->qlock, flags);
1350         snd_timer_user_append_to_tqueue(tu, &r1);
1351         spin_unlock_irqrestore(&tu->qlock, flags);
1352         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1353         wake_up(&tu->qchange_sleep);
1354 }
1355
1356 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1357 {
1358         struct snd_timer_user *tu = timeri->callback_data;
1359
1360         tu->disconnected = true;
1361         wake_up(&tu->qchange_sleep);
1362 }
1363
1364 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1365                                       unsigned long resolution,
1366                                       unsigned long ticks)
1367 {
1368         struct snd_timer_user *tu = timeri->callback_data;
1369         struct snd_timer_tread *r, r1;
1370         struct timespec tstamp;
1371         int prev, append = 0;
1372
1373         memset(&r1, 0, sizeof(r1));
1374         memset(&tstamp, 0, sizeof(tstamp));
1375         spin_lock(&tu->qlock);
1376         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1377                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1378                 spin_unlock(&tu->qlock);
1379                 return;
1380         }
1381         if (tu->last_resolution != resolution || ticks > 0) {
1382                 if (timer_tstamp_monotonic)
1383                         ktime_get_ts(&tstamp);
1384                 else
1385                         getnstimeofday(&tstamp);
1386         }
1387         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1388             tu->last_resolution != resolution) {
1389                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1390                 r1.tstamp = tstamp;
1391                 r1.val = resolution;
1392                 snd_timer_user_append_to_tqueue(tu, &r1);
1393                 tu->last_resolution = resolution;
1394                 append++;
1395         }
1396         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1397                 goto __wake;
1398         if (ticks == 0)
1399                 goto __wake;
1400         if (tu->qused > 0) {
1401                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1402                 r = &tu->tqueue[prev];
1403                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1404                         r->tstamp = tstamp;
1405                         r->val += ticks;
1406                         append++;
1407                         goto __wake;
1408                 }
1409         }
1410         r1.event = SNDRV_TIMER_EVENT_TICK;
1411         r1.tstamp = tstamp;
1412         r1.val = ticks;
1413         snd_timer_user_append_to_tqueue(tu, &r1);
1414         append++;
1415       __wake:
1416         spin_unlock(&tu->qlock);
1417         if (append == 0)
1418                 return;
1419         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1420         wake_up(&tu->qchange_sleep);
1421 }
1422
1423 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1424 {
1425         struct snd_timer_read *queue = NULL;
1426         struct snd_timer_tread *tqueue = NULL;
1427
1428         if (tu->tread) {
1429                 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1430                 if (!tqueue)
1431                         return -ENOMEM;
1432         } else {
1433                 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1434                 if (!queue)
1435                         return -ENOMEM;
1436         }
1437
1438         spin_lock_irq(&tu->qlock);
1439         kfree(tu->queue);
1440         kfree(tu->tqueue);
1441         tu->queue_size = size;
1442         tu->queue = queue;
1443         tu->tqueue = tqueue;
1444         tu->qhead = tu->qtail = tu->qused = 0;
1445         spin_unlock_irq(&tu->qlock);
1446
1447         return 0;
1448 }
1449
1450 static int snd_timer_user_open(struct inode *inode, struct file *file)
1451 {
1452         struct snd_timer_user *tu;
1453         int err;
1454
1455         err = stream_open(inode, file);
1456         if (err < 0)
1457                 return err;
1458
1459         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1460         if (tu == NULL)
1461                 return -ENOMEM;
1462         spin_lock_init(&tu->qlock);
1463         init_waitqueue_head(&tu->qchange_sleep);
1464         mutex_init(&tu->ioctl_lock);
1465         tu->ticks = 1;
1466         if (realloc_user_queue(tu, 128) < 0) {
1467                 kfree(tu);
1468                 return -ENOMEM;
1469         }
1470         file->private_data = tu;
1471         return 0;
1472 }
1473
1474 static int snd_timer_user_release(struct inode *inode, struct file *file)
1475 {
1476         struct snd_timer_user *tu;
1477
1478         if (file->private_data) {
1479                 tu = file->private_data;
1480                 file->private_data = NULL;
1481                 mutex_lock(&tu->ioctl_lock);
1482                 if (tu->timeri)
1483                         snd_timer_close(tu->timeri);
1484                 mutex_unlock(&tu->ioctl_lock);
1485                 kfree(tu->queue);
1486                 kfree(tu->tqueue);
1487                 kfree(tu);
1488         }
1489         return 0;
1490 }
1491
1492 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1493 {
1494         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1495         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1496         id->card = -1;
1497         id->device = -1;
1498         id->subdevice = -1;
1499 }
1500
1501 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1502 {
1503         id->dev_class = timer->tmr_class;
1504         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1505         id->card = timer->card ? timer->card->number : -1;
1506         id->device = timer->tmr_device;
1507         id->subdevice = timer->tmr_subdevice;
1508 }
1509
1510 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1511 {
1512         struct snd_timer_id id;
1513         struct snd_timer *timer;
1514         struct list_head *p;
1515
1516         if (copy_from_user(&id, _tid, sizeof(id)))
1517                 return -EFAULT;
1518         mutex_lock(&register_mutex);
1519         if (id.dev_class < 0) {         /* first item */
1520                 if (list_empty(&snd_timer_list))
1521                         snd_timer_user_zero_id(&id);
1522                 else {
1523                         timer = list_entry(snd_timer_list.next,
1524                                            struct snd_timer, device_list);
1525                         snd_timer_user_copy_id(&id, timer);
1526                 }
1527         } else {
1528                 switch (id.dev_class) {
1529                 case SNDRV_TIMER_CLASS_GLOBAL:
1530                         id.device = id.device < 0 ? 0 : id.device + 1;
1531                         list_for_each(p, &snd_timer_list) {
1532                                 timer = list_entry(p, struct snd_timer, device_list);
1533                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1534                                         snd_timer_user_copy_id(&id, timer);
1535                                         break;
1536                                 }
1537                                 if (timer->tmr_device >= id.device) {
1538                                         snd_timer_user_copy_id(&id, timer);
1539                                         break;
1540                                 }
1541                         }
1542                         if (p == &snd_timer_list)
1543                                 snd_timer_user_zero_id(&id);
1544                         break;
1545                 case SNDRV_TIMER_CLASS_CARD:
1546                 case SNDRV_TIMER_CLASS_PCM:
1547                         if (id.card < 0) {
1548                                 id.card = 0;
1549                         } else {
1550                                 if (id.device < 0) {
1551                                         id.device = 0;
1552                                 } else {
1553                                         if (id.subdevice < 0)
1554                                                 id.subdevice = 0;
1555                                         else if (id.subdevice < INT_MAX)
1556                                                 id.subdevice++;
1557                                 }
1558                         }
1559                         list_for_each(p, &snd_timer_list) {
1560                                 timer = list_entry(p, struct snd_timer, device_list);
1561                                 if (timer->tmr_class > id.dev_class) {
1562                                         snd_timer_user_copy_id(&id, timer);
1563                                         break;
1564                                 }
1565                                 if (timer->tmr_class < id.dev_class)
1566                                         continue;
1567                                 if (timer->card->number > id.card) {
1568                                         snd_timer_user_copy_id(&id, timer);
1569                                         break;
1570                                 }
1571                                 if (timer->card->number < id.card)
1572                                         continue;
1573                                 if (timer->tmr_device > id.device) {
1574                                         snd_timer_user_copy_id(&id, timer);
1575                                         break;
1576                                 }
1577                                 if (timer->tmr_device < id.device)
1578                                         continue;
1579                                 if (timer->tmr_subdevice > id.subdevice) {
1580                                         snd_timer_user_copy_id(&id, timer);
1581                                         break;
1582                                 }
1583                                 if (timer->tmr_subdevice < id.subdevice)
1584                                         continue;
1585                                 snd_timer_user_copy_id(&id, timer);
1586                                 break;
1587                         }
1588                         if (p == &snd_timer_list)
1589                                 snd_timer_user_zero_id(&id);
1590                         break;
1591                 default:
1592                         snd_timer_user_zero_id(&id);
1593                 }
1594         }
1595         mutex_unlock(&register_mutex);
1596         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1597                 return -EFAULT;
1598         return 0;
1599 }
1600
1601 static int snd_timer_user_ginfo(struct file *file,
1602                                 struct snd_timer_ginfo __user *_ginfo)
1603 {
1604         struct snd_timer_ginfo *ginfo;
1605         struct snd_timer_id tid;
1606         struct snd_timer *t;
1607         struct list_head *p;
1608         int err = 0;
1609
1610         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1611         if (IS_ERR(ginfo))
1612                 return PTR_ERR(ginfo);
1613
1614         tid = ginfo->tid;
1615         memset(ginfo, 0, sizeof(*ginfo));
1616         ginfo->tid = tid;
1617         mutex_lock(&register_mutex);
1618         t = snd_timer_find(&tid);
1619         if (t != NULL) {
1620                 ginfo->card = t->card ? t->card->number : -1;
1621                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1622                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1623                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1624                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1625                 ginfo->resolution = t->hw.resolution;
1626                 if (t->hw.resolution_min > 0) {
1627                         ginfo->resolution_min = t->hw.resolution_min;
1628                         ginfo->resolution_max = t->hw.resolution_max;
1629                 }
1630                 list_for_each(p, &t->open_list_head) {
1631                         ginfo->clients++;
1632                 }
1633         } else {
1634                 err = -ENODEV;
1635         }
1636         mutex_unlock(&register_mutex);
1637         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1638                 err = -EFAULT;
1639         kfree(ginfo);
1640         return err;
1641 }
1642
1643 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1644 {
1645         struct snd_timer *t;
1646         int err;
1647
1648         mutex_lock(&register_mutex);
1649         t = snd_timer_find(&gparams->tid);
1650         if (!t) {
1651                 err = -ENODEV;
1652                 goto _error;
1653         }
1654         if (!list_empty(&t->open_list_head)) {
1655                 err = -EBUSY;
1656                 goto _error;
1657         }
1658         if (!t->hw.set_period) {
1659                 err = -ENOSYS;
1660                 goto _error;
1661         }
1662         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1663 _error:
1664         mutex_unlock(&register_mutex);
1665         return err;
1666 }
1667
1668 static int snd_timer_user_gparams(struct file *file,
1669                                   struct snd_timer_gparams __user *_gparams)
1670 {
1671         struct snd_timer_gparams gparams;
1672
1673         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1674                 return -EFAULT;
1675         return timer_set_gparams(&gparams);
1676 }
1677
1678 static int snd_timer_user_gstatus(struct file *file,
1679                                   struct snd_timer_gstatus __user *_gstatus)
1680 {
1681         struct snd_timer_gstatus gstatus;
1682         struct snd_timer_id tid;
1683         struct snd_timer *t;
1684         int err = 0;
1685
1686         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1687                 return -EFAULT;
1688         tid = gstatus.tid;
1689         memset(&gstatus, 0, sizeof(gstatus));
1690         gstatus.tid = tid;
1691         mutex_lock(&register_mutex);
1692         t = snd_timer_find(&tid);
1693         if (t != NULL) {
1694                 spin_lock_irq(&t->lock);
1695                 gstatus.resolution = snd_timer_hw_resolution(t);
1696                 if (t->hw.precise_resolution) {
1697                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1698                                                  &gstatus.resolution_den);
1699                 } else {
1700                         gstatus.resolution_num = gstatus.resolution;
1701                         gstatus.resolution_den = 1000000000uL;
1702                 }
1703                 spin_unlock_irq(&t->lock);
1704         } else {
1705                 err = -ENODEV;
1706         }
1707         mutex_unlock(&register_mutex);
1708         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1709                 err = -EFAULT;
1710         return err;
1711 }
1712
1713 static int snd_timer_user_tselect(struct file *file,
1714                                   struct snd_timer_select __user *_tselect)
1715 {
1716         struct snd_timer_user *tu;
1717         struct snd_timer_select tselect;
1718         char str[32];
1719         int err = 0;
1720
1721         tu = file->private_data;
1722         if (tu->timeri) {
1723                 snd_timer_close(tu->timeri);
1724                 tu->timeri = NULL;
1725         }
1726         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1727                 err = -EFAULT;
1728                 goto __err;
1729         }
1730         sprintf(str, "application %i", current->pid);
1731         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1732                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1733         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1734         if (err < 0)
1735                 goto __err;
1736
1737         tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1738         tu->timeri->callback = tu->tread
1739                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1740         tu->timeri->ccallback = snd_timer_user_ccallback;
1741         tu->timeri->callback_data = (void *)tu;
1742         tu->timeri->disconnect = snd_timer_user_disconnect;
1743
1744       __err:
1745         return err;
1746 }
1747
1748 static int snd_timer_user_info(struct file *file,
1749                                struct snd_timer_info __user *_info)
1750 {
1751         struct snd_timer_user *tu;
1752         struct snd_timer_info *info;
1753         struct snd_timer *t;
1754         int err = 0;
1755
1756         tu = file->private_data;
1757         if (!tu->timeri)
1758                 return -EBADFD;
1759         t = tu->timeri->timer;
1760         if (!t)
1761                 return -EBADFD;
1762
1763         info = kzalloc(sizeof(*info), GFP_KERNEL);
1764         if (! info)
1765                 return -ENOMEM;
1766         info->card = t->card ? t->card->number : -1;
1767         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1768                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1769         strlcpy(info->id, t->id, sizeof(info->id));
1770         strlcpy(info->name, t->name, sizeof(info->name));
1771         info->resolution = t->hw.resolution;
1772         if (copy_to_user(_info, info, sizeof(*_info)))
1773                 err = -EFAULT;
1774         kfree(info);
1775         return err;
1776 }
1777
1778 static int snd_timer_user_params(struct file *file,
1779                                  struct snd_timer_params __user *_params)
1780 {
1781         struct snd_timer_user *tu;
1782         struct snd_timer_params params;
1783         struct snd_timer *t;
1784         int err;
1785
1786         tu = file->private_data;
1787         if (!tu->timeri)
1788                 return -EBADFD;
1789         t = tu->timeri->timer;
1790         if (!t)
1791                 return -EBADFD;
1792         if (copy_from_user(&params, _params, sizeof(params)))
1793                 return -EFAULT;
1794         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1795                 u64 resolution;
1796
1797                 if (params.ticks < 1) {
1798                         err = -EINVAL;
1799                         goto _end;
1800                 }
1801
1802                 /* Don't allow resolution less than 1ms */
1803                 resolution = snd_timer_resolution(tu->timeri);
1804                 resolution *= params.ticks;
1805                 if (resolution < 1000000) {
1806                         err = -EINVAL;
1807                         goto _end;
1808                 }
1809         }
1810         if (params.queue_size > 0 &&
1811             (params.queue_size < 32 || params.queue_size > 1024)) {
1812                 err = -EINVAL;
1813                 goto _end;
1814         }
1815         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1816                               (1<<SNDRV_TIMER_EVENT_TICK)|
1817                               (1<<SNDRV_TIMER_EVENT_START)|
1818                               (1<<SNDRV_TIMER_EVENT_STOP)|
1819                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1820                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1821                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1822                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1823                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1824                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1825                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1826                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1827                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1828                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1829                 err = -EINVAL;
1830                 goto _end;
1831         }
1832         snd_timer_stop(tu->timeri);
1833         spin_lock_irq(&t->lock);
1834         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1835                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1836                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1837         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1838                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1839         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1840                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1841         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1842                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1843         spin_unlock_irq(&t->lock);
1844         if (params.queue_size > 0 &&
1845             (unsigned int)tu->queue_size != params.queue_size) {
1846                 err = realloc_user_queue(tu, params.queue_size);
1847                 if (err < 0)
1848                         goto _end;
1849         }
1850         spin_lock_irq(&tu->qlock);
1851         tu->qhead = tu->qtail = tu->qused = 0;
1852         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1853                 if (tu->tread) {
1854                         struct snd_timer_tread tread;
1855                         memset(&tread, 0, sizeof(tread));
1856                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1857                         tread.tstamp.tv_sec = 0;
1858                         tread.tstamp.tv_nsec = 0;
1859                         tread.val = 0;
1860                         snd_timer_user_append_to_tqueue(tu, &tread);
1861                 } else {
1862                         struct snd_timer_read *r = &tu->queue[0];
1863                         r->resolution = 0;
1864                         r->ticks = 0;
1865                         tu->qused++;
1866                         tu->qtail++;
1867                 }
1868         }
1869         tu->filter = params.filter;
1870         tu->ticks = params.ticks;
1871         spin_unlock_irq(&tu->qlock);
1872         err = 0;
1873  _end:
1874         if (copy_to_user(_params, &params, sizeof(params)))
1875                 return -EFAULT;
1876         return err;
1877 }
1878
1879 static int snd_timer_user_status(struct file *file,
1880                                  struct snd_timer_status __user *_status)
1881 {
1882         struct snd_timer_user *tu;
1883         struct snd_timer_status status;
1884
1885         tu = file->private_data;
1886         if (!tu->timeri)
1887                 return -EBADFD;
1888         memset(&status, 0, sizeof(status));
1889         status.tstamp = tu->tstamp;
1890         status.resolution = snd_timer_resolution(tu->timeri);
1891         status.lost = tu->timeri->lost;
1892         status.overrun = tu->overrun;
1893         spin_lock_irq(&tu->qlock);
1894         status.queue = tu->qused;
1895         spin_unlock_irq(&tu->qlock);
1896         if (copy_to_user(_status, &status, sizeof(status)))
1897                 return -EFAULT;
1898         return 0;
1899 }
1900
1901 static int snd_timer_user_start(struct file *file)
1902 {
1903         int err;
1904         struct snd_timer_user *tu;
1905
1906         tu = file->private_data;
1907         if (!tu->timeri)
1908                 return -EBADFD;
1909         snd_timer_stop(tu->timeri);
1910         tu->timeri->lost = 0;
1911         tu->last_resolution = 0;
1912         err = snd_timer_start(tu->timeri, tu->ticks);
1913         if (err < 0)
1914                 return err;
1915         return 0;
1916 }
1917
1918 static int snd_timer_user_stop(struct file *file)
1919 {
1920         int err;
1921         struct snd_timer_user *tu;
1922
1923         tu = file->private_data;
1924         if (!tu->timeri)
1925                 return -EBADFD;
1926         err = snd_timer_stop(tu->timeri);
1927         if (err < 0)
1928                 return err;
1929         return 0;
1930 }
1931
1932 static int snd_timer_user_continue(struct file *file)
1933 {
1934         int err;
1935         struct snd_timer_user *tu;
1936
1937         tu = file->private_data;
1938         if (!tu->timeri)
1939                 return -EBADFD;
1940         /* start timer instead of continue if it's not used before */
1941         if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1942                 return snd_timer_user_start(file);
1943         tu->timeri->lost = 0;
1944         err = snd_timer_continue(tu->timeri);
1945         if (err < 0)
1946                 return err;
1947         return 0;
1948 }
1949
1950 static int snd_timer_user_pause(struct file *file)
1951 {
1952         int err;
1953         struct snd_timer_user *tu;
1954
1955         tu = file->private_data;
1956         if (!tu->timeri)
1957                 return -EBADFD;
1958         err = snd_timer_pause(tu->timeri);
1959         if (err < 0)
1960                 return err;
1961         return 0;
1962 }
1963
1964 enum {
1965         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1966         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1967         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1968         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1969 };
1970
1971 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1972                                  unsigned long arg)
1973 {
1974         struct snd_timer_user *tu;
1975         void __user *argp = (void __user *)arg;
1976         int __user *p = argp;
1977
1978         tu = file->private_data;
1979         switch (cmd) {
1980         case SNDRV_TIMER_IOCTL_PVERSION:
1981                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1982         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1983                 return snd_timer_user_next_device(argp);
1984         case SNDRV_TIMER_IOCTL_TREAD:
1985         {
1986                 int xarg, old_tread;
1987
1988                 if (tu->timeri) /* too late */
1989                         return -EBUSY;
1990                 if (get_user(xarg, p))
1991                         return -EFAULT;
1992                 old_tread = tu->tread;
1993                 tu->tread = xarg ? 1 : 0;
1994                 if (tu->tread != old_tread &&
1995                     realloc_user_queue(tu, tu->queue_size) < 0) {
1996                         tu->tread = old_tread;
1997                         return -ENOMEM;
1998                 }
1999                 return 0;
2000         }
2001         case SNDRV_TIMER_IOCTL_GINFO:
2002                 return snd_timer_user_ginfo(file, argp);
2003         case SNDRV_TIMER_IOCTL_GPARAMS:
2004                 return snd_timer_user_gparams(file, argp);
2005         case SNDRV_TIMER_IOCTL_GSTATUS:
2006                 return snd_timer_user_gstatus(file, argp);
2007         case SNDRV_TIMER_IOCTL_SELECT:
2008                 return snd_timer_user_tselect(file, argp);
2009         case SNDRV_TIMER_IOCTL_INFO:
2010                 return snd_timer_user_info(file, argp);
2011         case SNDRV_TIMER_IOCTL_PARAMS:
2012                 return snd_timer_user_params(file, argp);
2013         case SNDRV_TIMER_IOCTL_STATUS:
2014                 return snd_timer_user_status(file, argp);
2015         case SNDRV_TIMER_IOCTL_START:
2016         case SNDRV_TIMER_IOCTL_START_OLD:
2017                 return snd_timer_user_start(file);
2018         case SNDRV_TIMER_IOCTL_STOP:
2019         case SNDRV_TIMER_IOCTL_STOP_OLD:
2020                 return snd_timer_user_stop(file);
2021         case SNDRV_TIMER_IOCTL_CONTINUE:
2022         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
2023                 return snd_timer_user_continue(file);
2024         case SNDRV_TIMER_IOCTL_PAUSE:
2025         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
2026                 return snd_timer_user_pause(file);
2027         }
2028         return -ENOTTY;
2029 }
2030
2031 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2032                                  unsigned long arg)
2033 {
2034         struct snd_timer_user *tu = file->private_data;
2035         long ret;
2036
2037         mutex_lock(&tu->ioctl_lock);
2038         ret = __snd_timer_user_ioctl(file, cmd, arg);
2039         mutex_unlock(&tu->ioctl_lock);
2040         return ret;
2041 }
2042
2043 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2044 {
2045         struct snd_timer_user *tu;
2046
2047         tu = file->private_data;
2048         return fasync_helper(fd, file, on, &tu->fasync);
2049 }
2050
2051 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2052                                    size_t count, loff_t *offset)
2053 {
2054         struct snd_timer_user *tu;
2055         long result = 0, unit;
2056         int qhead;
2057         int err = 0;
2058
2059         tu = file->private_data;
2060         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2061         mutex_lock(&tu->ioctl_lock);
2062         spin_lock_irq(&tu->qlock);
2063         while ((long)count - result >= unit) {
2064                 while (!tu->qused) {
2065                         wait_queue_entry_t wait;
2066
2067                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2068                                 err = -EAGAIN;
2069                                 goto _error;
2070                         }
2071
2072                         set_current_state(TASK_INTERRUPTIBLE);
2073                         init_waitqueue_entry(&wait, current);
2074                         add_wait_queue(&tu->qchange_sleep, &wait);
2075
2076                         spin_unlock_irq(&tu->qlock);
2077                         mutex_unlock(&tu->ioctl_lock);
2078                         schedule();
2079                         mutex_lock(&tu->ioctl_lock);
2080                         spin_lock_irq(&tu->qlock);
2081
2082                         remove_wait_queue(&tu->qchange_sleep, &wait);
2083
2084                         if (tu->disconnected) {
2085                                 err = -ENODEV;
2086                                 goto _error;
2087                         }
2088                         if (signal_pending(current)) {
2089                                 err = -ERESTARTSYS;
2090                                 goto _error;
2091                         }
2092                 }
2093
2094                 qhead = tu->qhead++;
2095                 tu->qhead %= tu->queue_size;
2096                 tu->qused--;
2097                 spin_unlock_irq(&tu->qlock);
2098
2099                 if (tu->tread) {
2100                         if (copy_to_user(buffer, &tu->tqueue[qhead],
2101                                          sizeof(struct snd_timer_tread)))
2102                                 err = -EFAULT;
2103                 } else {
2104                         if (copy_to_user(buffer, &tu->queue[qhead],
2105                                          sizeof(struct snd_timer_read)))
2106                                 err = -EFAULT;
2107                 }
2108
2109                 spin_lock_irq(&tu->qlock);
2110                 if (err < 0)
2111                         goto _error;
2112                 result += unit;
2113                 buffer += unit;
2114         }
2115  _error:
2116         spin_unlock_irq(&tu->qlock);
2117         mutex_unlock(&tu->ioctl_lock);
2118         return result > 0 ? result : err;
2119 }
2120
2121 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2122 {
2123         __poll_t mask;
2124         struct snd_timer_user *tu;
2125
2126         tu = file->private_data;
2127
2128         poll_wait(file, &tu->qchange_sleep, wait);
2129
2130         mask = 0;
2131         spin_lock_irq(&tu->qlock);
2132         if (tu->qused)
2133                 mask |= EPOLLIN | EPOLLRDNORM;
2134         if (tu->disconnected)
2135                 mask |= EPOLLERR;
2136         spin_unlock_irq(&tu->qlock);
2137
2138         return mask;
2139 }
2140
2141 #ifdef CONFIG_COMPAT
2142 #include "timer_compat.c"
2143 #else
2144 #define snd_timer_user_ioctl_compat     NULL
2145 #endif
2146
2147 static const struct file_operations snd_timer_f_ops =
2148 {
2149         .owner =        THIS_MODULE,
2150         .read =         snd_timer_user_read,
2151         .open =         snd_timer_user_open,
2152         .release =      snd_timer_user_release,
2153         .llseek =       no_llseek,
2154         .poll =         snd_timer_user_poll,
2155         .unlocked_ioctl =       snd_timer_user_ioctl,
2156         .compat_ioctl = snd_timer_user_ioctl_compat,
2157         .fasync =       snd_timer_user_fasync,
2158 };
2159
2160 /* unregister the system timer */
2161 static void snd_timer_free_all(void)
2162 {
2163         struct snd_timer *timer, *n;
2164
2165         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2166                 snd_timer_free(timer);
2167 }
2168
2169 static struct device timer_dev;
2170
2171 /*
2172  *  ENTRY functions
2173  */
2174
2175 static int __init alsa_timer_init(void)
2176 {
2177         int err;
2178
2179         snd_device_initialize(&timer_dev, NULL);
2180         dev_set_name(&timer_dev, "timer");
2181
2182 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2183         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2184                               "system timer");
2185 #endif
2186
2187         err = snd_timer_register_system();
2188         if (err < 0) {
2189                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2190                 goto put_timer;
2191         }
2192
2193         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2194                                   &snd_timer_f_ops, NULL, &timer_dev);
2195         if (err < 0) {
2196                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2197                 snd_timer_free_all();
2198                 goto put_timer;
2199         }
2200
2201         snd_timer_proc_init();
2202         return 0;
2203
2204 put_timer:
2205         put_device(&timer_dev);
2206         return err;
2207 }
2208
2209 static void __exit alsa_timer_exit(void)
2210 {
2211         snd_unregister_device(&timer_dev);
2212         snd_timer_free_all();
2213         put_device(&timer_dev);
2214         snd_timer_proc_done();
2215 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2216         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2217 #endif
2218 }
2219
2220 module_init(alsa_timer_init)
2221 module_exit(alsa_timer_exit)