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