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