sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <linux/device.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <sound/core.h>
  31 #include <sound/timer.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/minors.h>
  35 #include <sound/initval.h>
  36 #include <linux/kmod.h>
  37
  38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
  39 #define DEFAULT_TIMER_LIMIT 4
  40 #else
  41 #define DEFAULT_TIMER_LIMIT 1
  42 #endif
  43
  44 static int timer_limit = DEFAULT_TIMER_LIMIT;
  45 static int timer_tstamp_monotonic = 1;
  46 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  47 MODULE_DESCRIPTION("ALSA timer interface");
  48 MODULE_LICENSE("GPL");
  49 module_param(timer_limit, int, 0444);
  50 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  51 module_param(timer_tstamp_monotonic, int, 0444);
  52 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  53
  54 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  55 MODULE_ALIAS("devname:snd/timer");
  56
  57 struct snd_timer_user {
  58         struct snd_timer_instance *timeri;
  59         int tread;              /* enhanced read with timestamps and events */
  60         unsigned long ticks;
  61         unsigned long overrun;
  62         int qhead;
  63         int qtail;
  64         int qused;
  65         int queue_size;
  66         bool disconnected;
  67         struct snd_timer_read *queue;
  68         struct snd_timer_tread *tqueue;
  69         spinlock_t qlock;
  70         unsigned long last_resolution;
  71         unsigned int filter;
  72         struct timespec tstamp;         /* trigger tstamp */
  73         wait_queue_head_t qchange_sleep;
  74         struct fasync_struct *fasync;
  75         struct mutex ioctl_lock;
  76 };
  77
  78 /* list of timers */
  79 static LIST_HEAD(snd_timer_list);
  80
  81 /* list of slave instances */
  82 static LIST_HEAD(snd_timer_slave_list);
  83
  84 /* lock for slave active lists */
  85 static DEFINE_SPINLOCK(slave_active_lock);
  86
  87 static DEFINE_MUTEX(register_mutex);
  88
  89 static int snd_timer_free(struct snd_timer *timer);
  90 static int snd_timer_dev_free(struct snd_device *device);
  91 static int snd_timer_dev_register(struct snd_device *device);
  92 static int snd_timer_dev_disconnect(struct snd_device *device);
  93
  94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  95
  96 /*
  97  * create a timer instance with the given owner string.
  98  * when timer is not NULL, increments the module counter
  99  */
 100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 101                                                          struct snd_timer *timer)
 102 {
 103         struct snd_timer_instance *timeri;
 104         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 105         if (timeri == NULL)
 106                 return NULL;
 107         timeri->owner = kstrdup(owner, GFP_KERNEL);
 108         if (! timeri->owner) {
 109                 kfree(timeri);
 110                 return NULL;
 111         }
 112         INIT_LIST_HEAD(&timeri->open_list);
 113         INIT_LIST_HEAD(&timeri->active_list);
 114         INIT_LIST_HEAD(&timeri->ack_list);
 115         INIT_LIST_HEAD(&timeri->slave_list_head);
 116         INIT_LIST_HEAD(&timeri->slave_active_head);
 117
 118         timeri->timer = timer;
 119         if (timer && !try_module_get(timer->module)) {
 120                 kfree(timeri->owner);
 121                 kfree(timeri);
 122                 return NULL;
 123         }
 124
 125         return timeri;
 126 }
 127
 128 /*
 129  * find a timer instance from the given timer id
 130  */
 131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 132 {
 133         struct snd_timer *timer = NULL;
 134
 135         list_for_each_entry(timer, &snd_timer_list, device_list) {
 136                 if (timer->tmr_class != tid->dev_class)
 137                         continue;
 138                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 139                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 140                     (timer->card == NULL ||
 141                      timer->card->number != tid->card))
 142                         continue;
 143                 if (timer->tmr_device != tid->device)
 144                         continue;
 145                 if (timer->tmr_subdevice != tid->subdevice)
 146                         continue;
 147                 return timer;
 148         }
 149         return NULL;
 150 }
 151
 152 #ifdef CONFIG_MODULES
 153
 154 static void snd_timer_request(struct snd_timer_id *tid)
 155 {
 156         switch (tid->dev_class) {
 157         case SNDRV_TIMER_CLASS_GLOBAL:
 158                 if (tid->device < timer_limit)
 159                         request_module("snd-timer-%i", tid->device);
 160                 break;
 161         case SNDRV_TIMER_CLASS_CARD:
 162         case SNDRV_TIMER_CLASS_PCM:
 163                 if (tid->card < snd_ecards_limit)
 164                         request_module("snd-card-%i", tid->card);
 165                 break;
 166         default:
 167                 break;
 168         }
 169 }
 170
 171 #endif
 172
 173 /*
 174  * look for a master instance matching with the slave id of the given slave.
 175  * when found, relink the open_link of the slave.
 176  *
 177  * call this with register_mutex down.
 178  */
 179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 180 {
 181         struct snd_timer *timer;
 182         struct snd_timer_instance *master;
 183
 184         /* FIXME: it's really dumb to look up all entries.. */
 185         list_for_each_entry(timer, &snd_timer_list, device_list) {
 186                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 187                         if (slave->slave_class == master->slave_class &&
 188                             slave->slave_id == master->slave_id) {
 189                                 list_move_tail(&slave->open_list,
 190                                                &master->slave_list_head);
 191                                 spin_lock_irq(&slave_active_lock);
 192                                 slave->master = master;
 193                                 slave->timer = master->timer;
 194                                 spin_unlock_irq(&slave_active_lock);
 195                                 return;
 196                         }
 197                 }
 198         }
 199 }
 200
 201 /*
 202  * look for slave instances matching with the slave id of the given master.
 203  * when found, relink the open_link of slaves.
 204  *
 205  * call this with register_mutex down.
 206  */
 207 static void snd_timer_check_master(struct snd_timer_instance *master)
 208 {
 209         struct snd_timer_instance *slave, *tmp;
 210
 211         /* check all pending slaves */
 212         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 213                 if (slave->slave_class == master->slave_class &&
 214                     slave->slave_id == master->slave_id) {
 215                         list_move_tail(&slave->open_list, &master->slave_list_head);
 216                         spin_lock_irq(&slave_active_lock);
 217                         spin_lock(&master->timer->lock);
 218                         slave->master = master;
 219                         slave->timer = master->timer;
 220                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 221                                 list_add_tail(&slave->active_list,
 222                                               &master->slave_active_head);
 223                         spin_unlock(&master->timer->lock);
 224                         spin_unlock_irq(&slave_active_lock);
 225                 }
 226         }
 227 }
 228
 229 /*
 230  * open a timer instance
 231  * when opening a master, the slave id must be here given.
 232  */
 233 int snd_timer_open(struct snd_timer_instance **ti,
 234                    char *owner, struct snd_timer_id *tid,
 235                    unsigned int slave_id)
 236 {
 237         struct snd_timer *timer;
 238         struct snd_timer_instance *timeri = NULL;
 239
 240         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 241                 /* open a slave instance */
 242                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 243                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 244                         pr_debug("ALSA: timer: invalid slave class %i\n",
 245                                  tid->dev_sclass);
 246                         return -EINVAL;
 247                 }
 248                 mutex_lock(&register_mutex);
 249                 timeri = snd_timer_instance_new(owner, NULL);
 250                 if (!timeri) {
 251                         mutex_unlock(&register_mutex);
 252                         return -ENOMEM;
 253                 }
 254                 timeri->slave_class = tid->dev_sclass;
 255                 timeri->slave_id = tid->device;
 256                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 257                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 258                 snd_timer_check_slave(timeri);
 259                 mutex_unlock(&register_mutex);
 260                 *ti = timeri;
 261                 return 0;
 262         }
 263
 264         /* open a master instance */
 265         mutex_lock(&register_mutex);
 266         timer = snd_timer_find(tid);
 267 #ifdef CONFIG_MODULES
 268         if (!timer) {
 269                 mutex_unlock(&register_mutex);
 270                 snd_timer_request(tid);
 271                 mutex_lock(&register_mutex);
 272                 timer = snd_timer_find(tid);
 273         }
 274 #endif
 275         if (!timer) {
 276                 mutex_unlock(&register_mutex);
 277                 return -ENODEV;
 278         }
 279         if (!list_empty(&timer->open_list_head)) {
 280                 timeri = list_entry(timer->open_list_head.next,
 281                                     struct snd_timer_instance, open_list);
 282                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 283                         mutex_unlock(&register_mutex);
 284                         return -EBUSY;
 285                 }
 286         }
 287         timeri = snd_timer_instance_new(owner, timer);
 288         if (!timeri) {
 289                 mutex_unlock(&register_mutex);
 290                 return -ENOMEM;
 291         }
 292         /* take a card refcount for safe disconnection */
 293         if (timer->card)
 294                 get_device(&timer->card->card_dev);
 295         timeri->slave_class = tid->dev_sclass;
 296         timeri->slave_id = slave_id;
 297
 298         if (list_empty(&timer->open_list_head) && timer->hw.open) {
 299                 int err = timer->hw.open(timer);
 300                 if (err) {
 301                         kfree(timeri->owner);
 302                         kfree(timeri);
 303
 304                         if (timer->card)
 305                                 put_device(&timer->card->card_dev);
 306                         module_put(timer->module);
 307                         mutex_unlock(&register_mutex);
 308                         return err;
 309                 }
 310         }
 311
 312         list_add_tail(&timeri->open_list, &timer->open_list_head);
 313         snd_timer_check_master(timeri);
 314         mutex_unlock(&register_mutex);
 315         *ti = timeri;
 316         return 0;
 317 }
 318
 319 /*
 320  * close a timer instance
 321  */
 322 int snd_timer_close(struct snd_timer_instance *timeri)
 323 {
 324         struct snd_timer *timer = NULL;
 325         struct snd_timer_instance *slave, *tmp;
 326
 327         if (snd_BUG_ON(!timeri))
 328                 return -ENXIO;
 329
 330         mutex_lock(&register_mutex);
 331         list_del(&timeri->open_list);
 332
 333         /* force to stop the timer */
 334         snd_timer_stop(timeri);
 335
 336         timer = timeri->timer;
 337         if (timer) {
 338                 /* wait, until the active callback is finished */
 339                 spin_lock_irq(&timer->lock);
 340                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 341                         spin_unlock_irq(&timer->lock);
 342                         udelay(10);
 343                         spin_lock_irq(&timer->lock);
 344                 }
 345                 spin_unlock_irq(&timer->lock);
 346
 347                 /* remove slave links */
 348                 spin_lock_irq(&slave_active_lock);
 349                 spin_lock(&timer->lock);
 350                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 351                                          open_list) {
 352                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 353                         slave->master = NULL;
 354                         slave->timer = NULL;
 355                         list_del_init(&slave->ack_list);
 356                         list_del_init(&slave->active_list);
 357                 }
 358                 spin_unlock(&timer->lock);
 359                 spin_unlock_irq(&slave_active_lock);
 360
 361                 /* slave doesn't need to release timer resources below */
 362                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 363                         timer = NULL;
 364         }
 365
 366         if (timeri->private_free)
 367                 timeri->private_free(timeri);
 368         kfree(timeri->owner);
 369         kfree(timeri);
 370
 371         if (timer) {
 372                 if (list_empty(&timer->open_list_head) && timer->hw.close)
 373                         timer->hw.close(timer);
 374                 /* release a card refcount for safe disconnection */
 375                 if (timer->card)
 376                         put_device(&timer->card->card_dev);
 377                 module_put(timer->module);
 378         }
 379
 380         mutex_unlock(&register_mutex);
 381         return 0;
 382 }
 383
 384 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 385 {
 386         struct snd_timer * timer;
 387
 388         if (timeri == NULL)
 389                 return 0;
 390         if ((timer = timeri->timer) != NULL) {
 391                 if (timer->hw.c_resolution)
 392                         return timer->hw.c_resolution(timer);
 393                 return timer->hw.resolution;
 394         }
 395         return 0;
 396 }
 397
 398 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 399 {
 400         struct snd_timer *timer;
 401         unsigned long resolution = 0;
 402         struct snd_timer_instance *ts;
 403         struct timespec tstamp;
 404
 405         if (timer_tstamp_monotonic)
 406                 ktime_get_ts(&tstamp);
 407         else
 408                 getnstimeofday(&tstamp);
 409         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 410                        event > SNDRV_TIMER_EVENT_PAUSE))
 411                 return;
 412         if (event == SNDRV_TIMER_EVENT_START ||
 413             event == SNDRV_TIMER_EVENT_CONTINUE)
 414                 resolution = snd_timer_resolution(ti);
 415         if (ti->ccallback)
 416                 ti->ccallback(ti, event, &tstamp, resolution);
 417         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 418                 return;
 419         timer = ti->timer;
 420         if (timer == NULL)
 421                 return;
 422         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 423                 return;
 424         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 425                 if (ts->ccallback)
 426                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 427 }
 428
 429 /* start/continue a master timer */
 430 static int snd_timer_start1(struct snd_timer_instance *timeri,
 431                             bool start, unsigned long ticks)
 432 {
 433         struct snd_timer *timer;
 434         int result;
 435         unsigned long flags;
 436
 437         timer = timeri->timer;
 438         if (!timer)
 439                 return -EINVAL;
 440
 441         spin_lock_irqsave(&timer->lock, flags);
 442         if (timer->card && timer->card->shutdown) {
 443                 result = -ENODEV;
 444                 goto unlock;
 445         }
 446         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 447                              SNDRV_TIMER_IFLG_START)) {
 448                 result = -EBUSY;
 449                 goto unlock;
 450         }
 451
 452         if (start)
 453                 timeri->ticks = timeri->cticks = ticks;
 454         else if (!timeri->cticks)
 455                 timeri->cticks = 1;
 456         timeri->pticks = 0;
 457
 458         list_move_tail(&timeri->active_list, &timer->active_list_head);
 459         if (timer->running) {
 460                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 461                         goto __start_now;
 462                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 463                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 464                 result = 1; /* delayed start */
 465         } else {
 466                 if (start)
 467                         timer->sticks = ticks;
 468                 timer->hw.start(timer);
 469               __start_now:
 470                 timer->running++;
 471                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 472                 result = 0;
 473         }
 474         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 475                           SNDRV_TIMER_EVENT_CONTINUE);
 476  unlock:
 477         spin_unlock_irqrestore(&timer->lock, flags);
 478         return result;
 479 }
 480
 481 /* start/continue a slave timer */
 482 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
 483                                  bool start)
 484 {
 485         unsigned long flags;
 486
 487         spin_lock_irqsave(&slave_active_lock, flags);
 488         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 489                 spin_unlock_irqrestore(&slave_active_lock, flags);
 490                 return -EBUSY;
 491         }
 492         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 493         if (timeri->master && timeri->timer) {
 494                 spin_lock(&timeri->timer->lock);
 495                 list_add_tail(&timeri->active_list,
 496                               &timeri->master->slave_active_head);
 497                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 498                                   SNDRV_TIMER_EVENT_CONTINUE);
 499                 spin_unlock(&timeri->timer->lock);
 500         }
 501         spin_unlock_irqrestore(&slave_active_lock, flags);
 502         return 1; /* delayed start */
 503 }
 504
 505 /* stop/pause a master timer */
 506 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
 507 {
 508         struct snd_timer *timer;
 509         int result = 0;
 510         unsigned long flags;
 511
 512         timer = timeri->timer;
 513         if (!timer)
 514                 return -EINVAL;
 515         spin_lock_irqsave(&timer->lock, flags);
 516         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 517                                SNDRV_TIMER_IFLG_START))) {
 518                 result = -EBUSY;
 519                 goto unlock;
 520         }
 521         list_del_init(&timeri->ack_list);
 522         list_del_init(&timeri->active_list);
 523         if (timer->card && timer->card->shutdown)
 524                 goto unlock;
 525         if (stop) {
 526                 timeri->cticks = timeri->ticks;
 527                 timeri->pticks = 0;
 528         }
 529         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 530             !(--timer->running)) {
 531                 timer->hw.stop(timer);
 532                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 533                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 534                         snd_timer_reschedule(timer, 0);
 535                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 536                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 537                                 timer->hw.start(timer);
 538                         }
 539                 }
 540         }
 541         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 542         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 543                           SNDRV_TIMER_EVENT_CONTINUE);
 544  unlock:
 545         spin_unlock_irqrestore(&timer->lock, flags);
 546         return result;
 547 }
 548
 549 /* stop/pause a slave timer */
 550 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
 551 {
 552         unsigned long flags;
 553
 554         spin_lock_irqsave(&slave_active_lock, flags);
 555         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 556                 spin_unlock_irqrestore(&slave_active_lock, flags);
 557                 return -EBUSY;
 558         }
 559         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 560         if (timeri->timer) {
 561                 spin_lock(&timeri->timer->lock);
 562                 list_del_init(&timeri->ack_list);
 563                 list_del_init(&timeri->active_list);
 564                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 565                                   SNDRV_TIMER_EVENT_CONTINUE);
 566                 spin_unlock(&timeri->timer->lock);
 567         }
 568         spin_unlock_irqrestore(&slave_active_lock, flags);
 569         return 0;
 570 }
 571
 572 /*
 573  *  start the timer instance
 574  */
 575 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 576 {
 577         if (timeri == NULL || ticks < 1)
 578                 return -EINVAL;
 579         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 580                 return snd_timer_start_slave(timeri, true);
 581         else
 582                 return snd_timer_start1(timeri, true, ticks);
 583 }
 584
 585 /*
 586  * stop the timer instance.
 587  *
 588  * do not call this from the timer callback!
 589  */
 590 int snd_timer_stop(struct snd_timer_instance *timeri)
 591 {
 592         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 593                 return snd_timer_stop_slave(timeri, true);
 594         else
 595                 return snd_timer_stop1(timeri, true);
 596 }
 597
 598 /*
 599  * start again..  the tick is kept.
 600  */
 601 int snd_timer_continue(struct snd_timer_instance *timeri)
 602 {
 603         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 604                 return snd_timer_start_slave(timeri, false);
 605         else
 606                 return snd_timer_start1(timeri, false, 0);
 607 }
 608
 609 /*
 610  * pause.. remember the ticks left
 611  */
 612 int snd_timer_pause(struct snd_timer_instance * timeri)
 613 {
 614         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 615                 return snd_timer_stop_slave(timeri, false);
 616         else
 617                 return snd_timer_stop1(timeri, false);
 618 }
 619
 620 /*
 621  * reschedule the timer
 622  *
 623  * start pending instances and check the scheduling ticks.
 624  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 625  */
 626 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 627 {
 628         struct snd_timer_instance *ti;
 629         unsigned long ticks = ~0UL;
 630
 631         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 632                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 633                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 634                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 635                         timer->running++;
 636                 }
 637                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 638                         if (ticks > ti->cticks)
 639                                 ticks = ti->cticks;
 640                 }
 641         }
 642         if (ticks == ~0UL) {
 643                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 644                 return;
 645         }
 646         if (ticks > timer->hw.ticks)
 647                 ticks = timer->hw.ticks;
 648         if (ticks_left != ticks)
 649                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 650         timer->sticks = ticks;
 651 }
 652
 653 /*
 654  * timer tasklet
 655  *
 656  */
 657 static void snd_timer_tasklet(unsigned long arg)
 658 {
 659         struct snd_timer *timer = (struct snd_timer *) arg;
 660         struct snd_timer_instance *ti;
 661         struct list_head *p;
 662         unsigned long resolution, ticks;
 663         unsigned long flags;
 664
 665         if (timer->card && timer->card->shutdown)
 666                 return;
 667
 668         spin_lock_irqsave(&timer->lock, flags);
 669         /* now process all callbacks */
 670         while (!list_empty(&timer->sack_list_head)) {
 671                 p = timer->sack_list_head.next;         /* get first item */
 672                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 673
 674                 /* remove from ack_list and make empty */
 675                 list_del_init(p);
 676
 677                 ticks = ti->pticks;
 678                 ti->pticks = 0;
 679                 resolution = ti->resolution;
 680
 681                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 682                 spin_unlock(&timer->lock);
 683                 if (ti->callback)
 684                         ti->callback(ti, resolution, ticks);
 685                 spin_lock(&timer->lock);
 686                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 687         }
 688         spin_unlock_irqrestore(&timer->lock, flags);
 689 }
 690
 691 /*
 692  * timer interrupt
 693  *
 694  * ticks_left is usually equal to timer->sticks.
 695  *
 696  */
 697 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 698 {
 699         struct snd_timer_instance *ti, *ts, *tmp;
 700         unsigned long resolution, ticks;
 701         struct list_head *p, *ack_list_head;
 702         unsigned long flags;
 703         int use_tasklet = 0;
 704
 705         if (timer == NULL)
 706                 return;
 707
 708         if (timer->card && timer->card->shutdown)
 709                 return;
 710
 711         spin_lock_irqsave(&timer->lock, flags);
 712
 713         /* remember the current resolution */
 714         if (timer->hw.c_resolution)
 715                 resolution = timer->hw.c_resolution(timer);
 716         else
 717                 resolution = timer->hw.resolution;
 718
 719         /* loop for all active instances
 720          * Here we cannot use list_for_each_entry because the active_list of a
 721          * processed instance is relinked to done_list_head before the callback
 722          * is called.
 723          */
 724         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 725                                  active_list) {
 726                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 727                         continue;
 728                 ti->pticks += ticks_left;
 729                 ti->resolution = resolution;
 730                 if (ti->cticks < ticks_left)
 731                         ti->cticks = 0;
 732                 else
 733                         ti->cticks -= ticks_left;
 734                 if (ti->cticks) /* not expired */
 735                         continue;
 736                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 737                         ti->cticks = ti->ticks;
 738                 } else {
 739                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 740                         --timer->running;
 741                         list_del_init(&ti->active_list);
 742                 }
 743                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 744                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 745                         ack_list_head = &timer->ack_list_head;
 746                 else
 747                         ack_list_head = &timer->sack_list_head;
 748                 if (list_empty(&ti->ack_list))
 749                         list_add_tail(&ti->ack_list, ack_list_head);
 750                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 751                         ts->pticks = ti->pticks;
 752                         ts->resolution = resolution;
 753                         if (list_empty(&ts->ack_list))
 754                                 list_add_tail(&ts->ack_list, ack_list_head);
 755                 }
 756         }
 757         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 758                 snd_timer_reschedule(timer, timer->sticks);
 759         if (timer->running) {
 760                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 761                         timer->hw.stop(timer);
 762                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 763                 }
 764                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 765                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 766                         /* restart timer */
 767                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 768                         timer->hw.start(timer);
 769                 }
 770         } else {
 771                 timer->hw.stop(timer);
 772         }
 773
 774         /* now process all fast callbacks */
 775         while (!list_empty(&timer->ack_list_head)) {
 776                 p = timer->ack_list_head.next;          /* get first item */
 777                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 778
 779                 /* remove from ack_list and make empty */
 780                 list_del_init(p);
 781
 782                 ticks = ti->pticks;
 783                 ti->pticks = 0;
 784
 785                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 786                 spin_unlock(&timer->lock);
 787                 if (ti->callback)
 788                         ti->callback(ti, resolution, ticks);
 789                 spin_lock(&timer->lock);
 790                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 791         }
 792
 793         /* do we have any slow callbacks? */
 794         use_tasklet = !list_empty(&timer->sack_list_head);
 795         spin_unlock_irqrestore(&timer->lock, flags);
 796
 797         if (use_tasklet)
 798                 tasklet_schedule(&timer->task_queue);
 799 }
 800
 801 /*
 802
 803  */
 804
 805 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 806                   struct snd_timer **rtimer)
 807 {
 808         struct snd_timer *timer;
 809         int err;
 810         static struct snd_device_ops ops = {
 811                 .dev_free = snd_timer_dev_free,
 812                 .dev_register = snd_timer_dev_register,
 813                 .dev_disconnect = snd_timer_dev_disconnect,
 814         };
 815
 816         if (snd_BUG_ON(!tid))
 817                 return -EINVAL;
 818         if (rtimer)
 819                 *rtimer = NULL;
 820         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 821         if (!timer)
 822                 return -ENOMEM;
 823         timer->tmr_class = tid->dev_class;
 824         timer->card = card;
 825         timer->tmr_device = tid->device;
 826         timer->tmr_subdevice = tid->subdevice;
 827         if (id)
 828                 strlcpy(timer->id, id, sizeof(timer->id));
 829         timer->sticks = 1;
 830         INIT_LIST_HEAD(&timer->device_list);
 831         INIT_LIST_HEAD(&timer->open_list_head);
 832         INIT_LIST_HEAD(&timer->active_list_head);
 833         INIT_LIST_HEAD(&timer->ack_list_head);
 834         INIT_LIST_HEAD(&timer->sack_list_head);
 835         spin_lock_init(&timer->lock);
 836         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 837                      (unsigned long)timer);
 838         if (card != NULL) {
 839                 timer->module = card->module;
 840                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 841                 if (err < 0) {
 842                         snd_timer_free(timer);
 843                         return err;
 844                 }
 845         }
 846         if (rtimer)
 847                 *rtimer = timer;
 848         return 0;
 849 }
 850
 851 static int snd_timer_free(struct snd_timer *timer)
 852 {
 853         if (!timer)
 854                 return 0;
 855
 856         mutex_lock(&register_mutex);
 857         if (! list_empty(&timer->open_list_head)) {
 858                 struct list_head *p, *n;
 859                 struct snd_timer_instance *ti;
 860                 pr_warn("ALSA: timer %p is busy?\n", timer);
 861                 list_for_each_safe(p, n, &timer->open_list_head) {
 862                         list_del_init(p);
 863                         ti = list_entry(p, struct snd_timer_instance, open_list);
 864                         ti->timer = NULL;
 865                 }
 866         }
 867         list_del(&timer->device_list);
 868         mutex_unlock(&register_mutex);
 869
 870         if (timer->private_free)
 871                 timer->private_free(timer);
 872         kfree(timer);
 873         return 0;
 874 }
 875
 876 static int snd_timer_dev_free(struct snd_device *device)
 877 {
 878         struct snd_timer *timer = device->device_data;
 879         return snd_timer_free(timer);
 880 }
 881
 882 static int snd_timer_dev_register(struct snd_device *dev)
 883 {
 884         struct snd_timer *timer = dev->device_data;
 885         struct snd_timer *timer1;
 886
 887         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 888                 return -ENXIO;
 889         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 890             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 891                 return -EINVAL;
 892
 893         mutex_lock(&register_mutex);
 894         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 895                 if (timer1->tmr_class > timer->tmr_class)
 896                         break;
 897                 if (timer1->tmr_class < timer->tmr_class)
 898                         continue;
 899                 if (timer1->card && timer->card) {
 900                         if (timer1->card->number > timer->card->number)
 901                                 break;
 902                         if (timer1->card->number < timer->card->number)
 903                                 continue;
 904                 }
 905                 if (timer1->tmr_device > timer->tmr_device)
 906                         break;
 907                 if (timer1->tmr_device < timer->tmr_device)
 908                         continue;
 909                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 910                         break;
 911                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 912                         continue;
 913                 /* conflicts.. */
 914                 mutex_unlock(&register_mutex);
 915                 return -EBUSY;
 916         }
 917         list_add_tail(&timer->device_list, &timer1->device_list);
 918         mutex_unlock(&register_mutex);
 919         return 0;
 920 }
 921
 922 static int snd_timer_dev_disconnect(struct snd_device *device)
 923 {
 924         struct snd_timer *timer = device->device_data;
 925         struct snd_timer_instance *ti;
 926
 927         mutex_lock(&register_mutex);
 928         list_del_init(&timer->device_list);
 929         /* wake up pending sleepers */
 930         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 931                 if (ti->disconnect)
 932                         ti->disconnect(ti);
 933         }
 934         mutex_unlock(&register_mutex);
 935         return 0;
 936 }
 937
 938 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 939 {
 940         unsigned long flags;
 941         unsigned long resolution = 0;
 942         struct snd_timer_instance *ti, *ts;
 943
 944         if (timer->card && timer->card->shutdown)
 945                 return;
 946         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 947                 return;
 948         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 949                        event > SNDRV_TIMER_EVENT_MRESUME))
 950                 return;
 951         spin_lock_irqsave(&timer->lock, flags);
 952         if (event == SNDRV_TIMER_EVENT_MSTART ||
 953             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 954             event == SNDRV_TIMER_EVENT_MRESUME) {
 955                 if (timer->hw.c_resolution)
 956                         resolution = timer->hw.c_resolution(timer);
 957                 else
 958                         resolution = timer->hw.resolution;
 959         }
 960         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 961                 if (ti->ccallback)
 962                         ti->ccallback(ti, event, tstamp, resolution);
 963                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 964                         if (ts->ccallback)
 965                                 ts->ccallback(ts, event, tstamp, resolution);
 966         }
 967         spin_unlock_irqrestore(&timer->lock, flags);
 968 }
 969
 970 /*
 971  * exported functions for global timers
 972  */
 973 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 974 {
 975         struct snd_timer_id tid;
 976
 977         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 978         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 979         tid.card = -1;
 980         tid.device = device;
 981         tid.subdevice = 0;
 982         return snd_timer_new(NULL, id, &tid, rtimer);
 983 }
 984
 985 int snd_timer_global_free(struct snd_timer *timer)
 986 {
 987         return snd_timer_free(timer);
 988 }
 989
 990 int snd_timer_global_register(struct snd_timer *timer)
 991 {
 992         struct snd_device dev;
 993
 994         memset(&dev, 0, sizeof(dev));
 995         dev.device_data = timer;
 996         return snd_timer_dev_register(&dev);
 997 }
 998
 999 /*
1000  *  System timer
1001  */
1002
1003 struct snd_timer_system_private {
1004         struct timer_list tlist;
1005         unsigned long last_expires;
1006         unsigned long last_jiffies;
1007         unsigned long correction;
1008 };
1009
1010 static void snd_timer_s_function(unsigned long data)
1011 {
1012         struct snd_timer *timer = (struct snd_timer *)data;
1013         struct snd_timer_system_private *priv = timer->private_data;
1014         unsigned long jiff = jiffies;
1015         if (time_after(jiff, priv->last_expires))
1016                 priv->correction += (long)jiff - (long)priv->last_expires;
1017         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1018 }
1019
1020 static int snd_timer_s_start(struct snd_timer * timer)
1021 {
1022         struct snd_timer_system_private *priv;
1023         unsigned long njiff;
1024
1025         priv = (struct snd_timer_system_private *) timer->private_data;
1026         njiff = (priv->last_jiffies = jiffies);
1027         if (priv->correction > timer->sticks - 1) {
1028                 priv->correction -= timer->sticks - 1;
1029                 njiff++;
1030         } else {
1031                 njiff += timer->sticks - priv->correction;
1032                 priv->correction = 0;
1033         }
1034         priv->last_expires = njiff;
1035         mod_timer(&priv->tlist, njiff);
1036         return 0;
1037 }
1038
1039 static int snd_timer_s_stop(struct snd_timer * timer)
1040 {
1041         struct snd_timer_system_private *priv;
1042         unsigned long jiff;
1043
1044         priv = (struct snd_timer_system_private *) timer->private_data;
1045         del_timer(&priv->tlist);
1046         jiff = jiffies;
1047         if (time_before(jiff, priv->last_expires))
1048                 timer->sticks = priv->last_expires - jiff;
1049         else
1050                 timer->sticks = 1;
1051         priv->correction = 0;
1052         return 0;
1053 }
1054
1055 static int snd_timer_s_close(struct snd_timer *timer)
1056 {
1057         struct snd_timer_system_private *priv;
1058
1059         priv = (struct snd_timer_system_private *)timer->private_data;
1060         del_timer_sync(&priv->tlist);
1061         return 0;
1062 }
1063
1064 static struct snd_timer_hardware snd_timer_system =
1065 {
1066         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1067         .resolution =   1000000000L / HZ,
1068         .ticks =        10000000L,
1069         .close =        snd_timer_s_close,
1070         .start =        snd_timer_s_start,
1071         .stop =         snd_timer_s_stop
1072 };
1073
1074 static void snd_timer_free_system(struct snd_timer *timer)
1075 {
1076         kfree(timer->private_data);
1077 }
1078
1079 static int snd_timer_register_system(void)
1080 {
1081         struct snd_timer *timer;
1082         struct snd_timer_system_private *priv;
1083         int err;
1084
1085         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1086         if (err < 0)
1087                 return err;
1088         strcpy(timer->name, "system timer");
1089         timer->hw = snd_timer_system;
1090         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1091         if (priv == NULL) {
1092                 snd_timer_free(timer);
1093                 return -ENOMEM;
1094         }
1095         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1096         timer->private_data = priv;
1097         timer->private_free = snd_timer_free_system;
1098         return snd_timer_global_register(timer);
1099 }
1100
1101 #ifdef CONFIG_SND_PROC_FS
1102 /*
1103  *  Info interface
1104  */
1105
1106 static void snd_timer_proc_read(struct snd_info_entry *entry,
1107                                 struct snd_info_buffer *buffer)
1108 {
1109         struct snd_timer *timer;
1110         struct snd_timer_instance *ti;
1111
1112         mutex_lock(&register_mutex);
1113         list_for_each_entry(timer, &snd_timer_list, device_list) {
1114                 if (timer->card && timer->card->shutdown)
1115                         continue;
1116                 switch (timer->tmr_class) {
1117                 case SNDRV_TIMER_CLASS_GLOBAL:
1118                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1119                         break;
1120                 case SNDRV_TIMER_CLASS_CARD:
1121                         snd_iprintf(buffer, "C%i-%i: ",
1122                                     timer->card->number, timer->tmr_device);
1123                         break;
1124                 case SNDRV_TIMER_CLASS_PCM:
1125                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1126                                     timer->tmr_device, timer->tmr_subdevice);
1127                         break;
1128                 default:
1129                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1130                                     timer->card ? timer->card->number : -1,
1131                                     timer->tmr_device, timer->tmr_subdevice);
1132                 }
1133                 snd_iprintf(buffer, "%s :", timer->name);
1134                 if (timer->hw.resolution)
1135                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1136                                     timer->hw.resolution / 1000,
1137                                     timer->hw.resolution % 1000,
1138                                     timer->hw.ticks);
1139                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1140                         snd_iprintf(buffer, " SLAVE");
1141                 snd_iprintf(buffer, "\n");
1142                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1143                         snd_iprintf(buffer, "  Client %s : %s\n",
1144                                     ti->owner ? ti->owner : "unknown",
1145                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1146                                                  SNDRV_TIMER_IFLG_RUNNING)
1147                                     ? "running" : "stopped");
1148         }
1149         mutex_unlock(&register_mutex);
1150 }
1151
1152 static struct snd_info_entry *snd_timer_proc_entry;
1153
1154 static void __init snd_timer_proc_init(void)
1155 {
1156         struct snd_info_entry *entry;
1157
1158         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1159         if (entry != NULL) {
1160                 entry->c.text.read = snd_timer_proc_read;
1161                 if (snd_info_register(entry) < 0) {
1162                         snd_info_free_entry(entry);
1163                         entry = NULL;
1164                 }
1165         }
1166         snd_timer_proc_entry = entry;
1167 }
1168
1169 static void __exit snd_timer_proc_done(void)
1170 {
1171         snd_info_free_entry(snd_timer_proc_entry);
1172 }
1173 #else /* !CONFIG_SND_PROC_FS */
1174 #define snd_timer_proc_init()
1175 #define snd_timer_proc_done()
1176 #endif
1177
1178 /*
1179  *  USER SPACE interface
1180  */
1181
1182 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1183                                      unsigned long resolution,
1184                                      unsigned long ticks)
1185 {
1186         struct snd_timer_user *tu = timeri->callback_data;
1187         struct snd_timer_read *r;
1188         int prev;
1189
1190         spin_lock(&tu->qlock);
1191         if (tu->qused > 0) {
1192                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1193                 r = &tu->queue[prev];
1194                 if (r->resolution == resolution) {
1195                         r->ticks += ticks;
1196                         goto __wake;
1197                 }
1198         }
1199         if (tu->qused >= tu->queue_size) {
1200                 tu->overrun++;
1201         } else {
1202                 r = &tu->queue[tu->qtail++];
1203                 tu->qtail %= tu->queue_size;
1204                 r->resolution = resolution;
1205                 r->ticks = ticks;
1206                 tu->qused++;
1207         }
1208       __wake:
1209         spin_unlock(&tu->qlock);
1210         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1211         wake_up(&tu->qchange_sleep);
1212 }
1213
1214 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1215                                             struct snd_timer_tread *tread)
1216 {
1217         if (tu->qused >= tu->queue_size) {
1218                 tu->overrun++;
1219         } else {
1220                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1221                 tu->qtail %= tu->queue_size;
1222                 tu->qused++;
1223         }
1224 }
1225
1226 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1227                                      int event,
1228                                      struct timespec *tstamp,
1229                                      unsigned long resolution)
1230 {
1231         struct snd_timer_user *tu = timeri->callback_data;
1232         struct snd_timer_tread r1;
1233         unsigned long flags;
1234
1235         if (event >= SNDRV_TIMER_EVENT_START &&
1236             event <= SNDRV_TIMER_EVENT_PAUSE)
1237                 tu->tstamp = *tstamp;
1238         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1239                 return;
1240         memset(&r1, 0, sizeof(r1));
1241         r1.event = event;
1242         r1.tstamp = *tstamp;
1243         r1.val = resolution;
1244         spin_lock_irqsave(&tu->qlock, flags);
1245         snd_timer_user_append_to_tqueue(tu, &r1);
1246         spin_unlock_irqrestore(&tu->qlock, flags);
1247         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1248         wake_up(&tu->qchange_sleep);
1249 }
1250
1251 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1252 {
1253         struct snd_timer_user *tu = timeri->callback_data;
1254
1255         tu->disconnected = true;
1256         wake_up(&tu->qchange_sleep);
1257 }
1258
1259 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1260                                       unsigned long resolution,
1261                                       unsigned long ticks)
1262 {
1263         struct snd_timer_user *tu = timeri->callback_data;
1264         struct snd_timer_tread *r, r1;
1265         struct timespec tstamp;
1266         int prev, append = 0;
1267
1268         memset(&tstamp, 0, sizeof(tstamp));
1269         spin_lock(&tu->qlock);
1270         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1271                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1272                 spin_unlock(&tu->qlock);
1273                 return;
1274         }
1275         if (tu->last_resolution != resolution || ticks > 0) {
1276                 if (timer_tstamp_monotonic)
1277                         ktime_get_ts(&tstamp);
1278                 else
1279                         getnstimeofday(&tstamp);
1280         }
1281         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1282             tu->last_resolution != resolution) {
1283                 memset(&r1, 0, sizeof(r1));
1284                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1285                 r1.tstamp = tstamp;
1286                 r1.val = resolution;
1287                 snd_timer_user_append_to_tqueue(tu, &r1);
1288                 tu->last_resolution = resolution;
1289                 append++;
1290         }
1291         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1292                 goto __wake;
1293         if (ticks == 0)
1294                 goto __wake;
1295         if (tu->qused > 0) {
1296                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1297                 r = &tu->tqueue[prev];
1298                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1299                         r->tstamp = tstamp;
1300                         r->val += ticks;
1301                         append++;
1302                         goto __wake;
1303                 }
1304         }
1305         r1.event = SNDRV_TIMER_EVENT_TICK;
1306         r1.tstamp = tstamp;
1307         r1.val = ticks;
1308         snd_timer_user_append_to_tqueue(tu, &r1);
1309         append++;
1310       __wake:
1311         spin_unlock(&tu->qlock);
1312         if (append == 0)
1313                 return;
1314         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1315         wake_up(&tu->qchange_sleep);
1316 }
1317
1318 static int snd_timer_user_open(struct inode *inode, struct file *file)
1319 {
1320         struct snd_timer_user *tu;
1321         int err;
1322
1323         err = nonseekable_open(inode, file);
1324         if (err < 0)
1325                 return err;
1326
1327         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1328         if (tu == NULL)
1329                 return -ENOMEM;
1330         spin_lock_init(&tu->qlock);
1331         init_waitqueue_head(&tu->qchange_sleep);
1332         mutex_init(&tu->ioctl_lock);
1333         tu->ticks = 1;
1334         tu->queue_size = 128;
1335         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1336                             GFP_KERNEL);
1337         if (tu->queue == NULL) {
1338                 kfree(tu);
1339                 return -ENOMEM;
1340         }
1341         file->private_data = tu;
1342         return 0;
1343 }
1344
1345 static int snd_timer_user_release(struct inode *inode, struct file *file)
1346 {
1347         struct snd_timer_user *tu;
1348
1349         if (file->private_data) {
1350                 tu = file->private_data;
1351                 file->private_data = NULL;
1352                 mutex_lock(&tu->ioctl_lock);
1353                 if (tu->timeri)
1354                         snd_timer_close(tu->timeri);
1355                 mutex_unlock(&tu->ioctl_lock);
1356                 kfree(tu->queue);
1357                 kfree(tu->tqueue);
1358                 kfree(tu);
1359         }
1360         return 0;
1361 }
1362
1363 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1364 {
1365         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1366         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1367         id->card = -1;
1368         id->device = -1;
1369         id->subdevice = -1;
1370 }
1371
1372 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1373 {
1374         id->dev_class = timer->tmr_class;
1375         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1376         id->card = timer->card ? timer->card->number : -1;
1377         id->device = timer->tmr_device;
1378         id->subdevice = timer->tmr_subdevice;
1379 }
1380
1381 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1382 {
1383         struct snd_timer_id id;
1384         struct snd_timer *timer;
1385         struct list_head *p;
1386
1387         if (copy_from_user(&id, _tid, sizeof(id)))
1388                 return -EFAULT;
1389         mutex_lock(&register_mutex);
1390         if (id.dev_class < 0) {         /* first item */
1391                 if (list_empty(&snd_timer_list))
1392                         snd_timer_user_zero_id(&id);
1393                 else {
1394                         timer = list_entry(snd_timer_list.next,
1395                                            struct snd_timer, device_list);
1396                         snd_timer_user_copy_id(&id, timer);
1397                 }
1398         } else {
1399                 switch (id.dev_class) {
1400                 case SNDRV_TIMER_CLASS_GLOBAL:
1401                         id.device = id.device < 0 ? 0 : id.device + 1;
1402                         list_for_each(p, &snd_timer_list) {
1403                                 timer = list_entry(p, struct snd_timer, device_list);
1404                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1405                                         snd_timer_user_copy_id(&id, timer);
1406                                         break;
1407                                 }
1408                                 if (timer->tmr_device >= id.device) {
1409                                         snd_timer_user_copy_id(&id, timer);
1410                                         break;
1411                                 }
1412                         }
1413                         if (p == &snd_timer_list)
1414                                 snd_timer_user_zero_id(&id);
1415                         break;
1416                 case SNDRV_TIMER_CLASS_CARD:
1417                 case SNDRV_TIMER_CLASS_PCM:
1418                         if (id.card < 0) {
1419                                 id.card = 0;
1420                         } else {
1421                                 if (id.card < 0) {
1422                                         id.card = 0;
1423                                 } else {
1424                                         if (id.device < 0) {
1425                                                 id.device = 0;
1426                                         } else {
1427                                                 if (id.subdevice < 0) {
1428                                                         id.subdevice = 0;
1429                                                 } else {
1430                                                         id.subdevice++;
1431                                                 }
1432                                         }
1433                                 }
1434                         }
1435                         list_for_each(p, &snd_timer_list) {
1436                                 timer = list_entry(p, struct snd_timer, device_list);
1437                                 if (timer->tmr_class > id.dev_class) {
1438                                         snd_timer_user_copy_id(&id, timer);
1439                                         break;
1440                                 }
1441                                 if (timer->tmr_class < id.dev_class)
1442                                         continue;
1443                                 if (timer->card->number > id.card) {
1444                                         snd_timer_user_copy_id(&id, timer);
1445                                         break;
1446                                 }
1447                                 if (timer->card->number < id.card)
1448                                         continue;
1449                                 if (timer->tmr_device > id.device) {
1450                                         snd_timer_user_copy_id(&id, timer);
1451                                         break;
1452                                 }
1453                                 if (timer->tmr_device < id.device)
1454                                         continue;
1455                                 if (timer->tmr_subdevice > id.subdevice) {
1456                                         snd_timer_user_copy_id(&id, timer);
1457                                         break;
1458                                 }
1459                                 if (timer->tmr_subdevice < id.subdevice)
1460                                         continue;
1461                                 snd_timer_user_copy_id(&id, timer);
1462                                 break;
1463                         }
1464                         if (p == &snd_timer_list)
1465                                 snd_timer_user_zero_id(&id);
1466                         break;
1467                 default:
1468                         snd_timer_user_zero_id(&id);
1469                 }
1470         }
1471         mutex_unlock(&register_mutex);
1472         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1473                 return -EFAULT;
1474         return 0;
1475 }
1476
1477 static int snd_timer_user_ginfo(struct file *file,
1478                                 struct snd_timer_ginfo __user *_ginfo)
1479 {
1480         struct snd_timer_ginfo *ginfo;
1481         struct snd_timer_id tid;
1482         struct snd_timer *t;
1483         struct list_head *p;
1484         int err = 0;
1485
1486         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1487         if (IS_ERR(ginfo))
1488                 return PTR_ERR(ginfo);
1489
1490         tid = ginfo->tid;
1491         memset(ginfo, 0, sizeof(*ginfo));
1492         ginfo->tid = tid;
1493         mutex_lock(&register_mutex);
1494         t = snd_timer_find(&tid);
1495         if (t != NULL) {
1496                 ginfo->card = t->card ? t->card->number : -1;
1497                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1498                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1499                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1500                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1501                 ginfo->resolution = t->hw.resolution;
1502                 if (t->hw.resolution_min > 0) {
1503                         ginfo->resolution_min = t->hw.resolution_min;
1504                         ginfo->resolution_max = t->hw.resolution_max;
1505                 }
1506                 list_for_each(p, &t->open_list_head) {
1507                         ginfo->clients++;
1508                 }
1509         } else {
1510                 err = -ENODEV;
1511         }
1512         mutex_unlock(&register_mutex);
1513         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1514                 err = -EFAULT;
1515         kfree(ginfo);
1516         return err;
1517 }
1518
1519 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1520 {
1521         struct snd_timer *t;
1522         int err;
1523
1524         mutex_lock(&register_mutex);
1525         t = snd_timer_find(&gparams->tid);
1526         if (!t) {
1527                 err = -ENODEV;
1528                 goto _error;
1529         }
1530         if (!list_empty(&t->open_list_head)) {
1531                 err = -EBUSY;
1532                 goto _error;
1533         }
1534         if (!t->hw.set_period) {
1535                 err = -ENOSYS;
1536                 goto _error;
1537         }
1538         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1539 _error:
1540         mutex_unlock(&register_mutex);
1541         return err;
1542 }
1543
1544 static int snd_timer_user_gparams(struct file *file,
1545                                   struct snd_timer_gparams __user *_gparams)
1546 {
1547         struct snd_timer_gparams gparams;
1548
1549         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1550                 return -EFAULT;
1551         return timer_set_gparams(&gparams);
1552 }
1553
1554 static int snd_timer_user_gstatus(struct file *file,
1555                                   struct snd_timer_gstatus __user *_gstatus)
1556 {
1557         struct snd_timer_gstatus gstatus;
1558         struct snd_timer_id tid;
1559         struct snd_timer *t;
1560         int err = 0;
1561
1562         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1563                 return -EFAULT;
1564         tid = gstatus.tid;
1565         memset(&gstatus, 0, sizeof(gstatus));
1566         gstatus.tid = tid;
1567         mutex_lock(&register_mutex);
1568         t = snd_timer_find(&tid);
1569         if (t != NULL) {
1570                 if (t->hw.c_resolution)
1571                         gstatus.resolution = t->hw.c_resolution(t);
1572                 else
1573                         gstatus.resolution = t->hw.resolution;
1574                 if (t->hw.precise_resolution) {
1575                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1576                                                  &gstatus.resolution_den);
1577                 } else {
1578                         gstatus.resolution_num = gstatus.resolution;
1579                         gstatus.resolution_den = 1000000000uL;
1580                 }
1581         } else {
1582                 err = -ENODEV;
1583         }
1584         mutex_unlock(&register_mutex);
1585         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1586                 err = -EFAULT;
1587         return err;
1588 }
1589
1590 static int snd_timer_user_tselect(struct file *file,
1591                                   struct snd_timer_select __user *_tselect)
1592 {
1593         struct snd_timer_user *tu;
1594         struct snd_timer_select tselect;
1595         char str[32];
1596         int err = 0;
1597
1598         tu = file->private_data;
1599         if (tu->timeri) {
1600                 snd_timer_close(tu->timeri);
1601                 tu->timeri = NULL;
1602         }
1603         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1604                 err = -EFAULT;
1605                 goto __err;
1606         }
1607         sprintf(str, "application %i", current->pid);
1608         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1609                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1610         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1611         if (err < 0)
1612                 goto __err;
1613
1614         kfree(tu->queue);
1615         tu->queue = NULL;
1616         kfree(tu->tqueue);
1617         tu->tqueue = NULL;
1618         if (tu->tread) {
1619                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1620                                      GFP_KERNEL);
1621                 if (tu->tqueue == NULL)
1622                         err = -ENOMEM;
1623         } else {
1624                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1625                                     GFP_KERNEL);
1626                 if (tu->queue == NULL)
1627                         err = -ENOMEM;
1628         }
1629
1630         if (err < 0) {
1631                 snd_timer_close(tu->timeri);
1632                 tu->timeri = NULL;
1633         } else {
1634                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1635                 tu->timeri->callback = tu->tread
1636                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1637                 tu->timeri->ccallback = snd_timer_user_ccallback;
1638                 tu->timeri->callback_data = (void *)tu;
1639                 tu->timeri->disconnect = snd_timer_user_disconnect;
1640         }
1641
1642       __err:
1643         return err;
1644 }
1645
1646 static int snd_timer_user_info(struct file *file,
1647                                struct snd_timer_info __user *_info)
1648 {
1649         struct snd_timer_user *tu;
1650         struct snd_timer_info *info;
1651         struct snd_timer *t;
1652         int err = 0;
1653
1654         tu = file->private_data;
1655         if (!tu->timeri)
1656                 return -EBADFD;
1657         t = tu->timeri->timer;
1658         if (!t)
1659                 return -EBADFD;
1660
1661         info = kzalloc(sizeof(*info), GFP_KERNEL);
1662         if (! info)
1663                 return -ENOMEM;
1664         info->card = t->card ? t->card->number : -1;
1665         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1666                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1667         strlcpy(info->id, t->id, sizeof(info->id));
1668         strlcpy(info->name, t->name, sizeof(info->name));
1669         info->resolution = t->hw.resolution;
1670         if (copy_to_user(_info, info, sizeof(*_info)))
1671                 err = -EFAULT;
1672         kfree(info);
1673         return err;
1674 }
1675
1676 static int snd_timer_user_params(struct file *file,
1677                                  struct snd_timer_params __user *_params)
1678 {
1679         struct snd_timer_user *tu;
1680         struct snd_timer_params params;
1681         struct snd_timer *t;
1682         struct snd_timer_read *tr;
1683         struct snd_timer_tread *ttr;
1684         int err;
1685
1686         tu = file->private_data;
1687         if (!tu->timeri)
1688                 return -EBADFD;
1689         t = tu->timeri->timer;
1690         if (!t)
1691                 return -EBADFD;
1692         if (copy_from_user(&params, _params, sizeof(params)))
1693                 return -EFAULT;
1694         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1695                 err = -EINVAL;
1696                 goto _end;
1697         }
1698         if (params.queue_size > 0 &&
1699             (params.queue_size < 32 || params.queue_size > 1024)) {
1700                 err = -EINVAL;
1701                 goto _end;
1702         }
1703         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1704                               (1<<SNDRV_TIMER_EVENT_TICK)|
1705                               (1<<SNDRV_TIMER_EVENT_START)|
1706                               (1<<SNDRV_TIMER_EVENT_STOP)|
1707                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1708                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1709                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1710                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1711                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1712                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1713                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1714                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1715                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1716                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1717                 err = -EINVAL;
1718                 goto _end;
1719         }
1720         snd_timer_stop(tu->timeri);
1721         spin_lock_irq(&t->lock);
1722         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1723                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1724                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1725         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1726                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1727         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1728                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1729         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1730                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1731         spin_unlock_irq(&t->lock);
1732         if (params.queue_size > 0 &&
1733             (unsigned int)tu->queue_size != params.queue_size) {
1734                 if (tu->tread) {
1735                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1736                                       GFP_KERNEL);
1737                         if (ttr) {
1738                                 kfree(tu->tqueue);
1739                                 tu->queue_size = params.queue_size;
1740                                 tu->tqueue = ttr;
1741                         }
1742                 } else {
1743                         tr = kmalloc(params.queue_size * sizeof(*tr),
1744                                      GFP_KERNEL);
1745                         if (tr) {
1746                                 kfree(tu->queue);
1747                                 tu->queue_size = params.queue_size;
1748                                 tu->queue = tr;
1749                         }
1750                 }
1751         }
1752         tu->qhead = tu->qtail = tu->qused = 0;
1753         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1754                 if (tu->tread) {
1755                         struct snd_timer_tread tread;
1756                         memset(&tread, 0, sizeof(tread));
1757                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1758                         tread.tstamp.tv_sec = 0;
1759                         tread.tstamp.tv_nsec = 0;
1760                         tread.val = 0;
1761                         snd_timer_user_append_to_tqueue(tu, &tread);
1762                 } else {
1763                         struct snd_timer_read *r = &tu->queue[0];
1764                         r->resolution = 0;
1765                         r->ticks = 0;
1766                         tu->qused++;
1767                         tu->qtail++;
1768                 }
1769         }
1770         tu->filter = params.filter;
1771         tu->ticks = params.ticks;
1772         err = 0;
1773  _end:
1774         if (copy_to_user(_params, &params, sizeof(params)))
1775                 return -EFAULT;
1776         return err;
1777 }
1778
1779 static int snd_timer_user_status(struct file *file,
1780                                  struct snd_timer_status __user *_status)
1781 {
1782         struct snd_timer_user *tu;
1783         struct snd_timer_status status;
1784
1785         tu = file->private_data;
1786         if (!tu->timeri)
1787                 return -EBADFD;
1788         memset(&status, 0, sizeof(status));
1789         status.tstamp = tu->tstamp;
1790         status.resolution = snd_timer_resolution(tu->timeri);
1791         status.lost = tu->timeri->lost;
1792         status.overrun = tu->overrun;
1793         spin_lock_irq(&tu->qlock);
1794         status.queue = tu->qused;
1795         spin_unlock_irq(&tu->qlock);
1796         if (copy_to_user(_status, &status, sizeof(status)))
1797                 return -EFAULT;
1798         return 0;
1799 }
1800
1801 static int snd_timer_user_start(struct file *file)
1802 {
1803         int err;
1804         struct snd_timer_user *tu;
1805
1806         tu = file->private_data;
1807         if (!tu->timeri)
1808                 return -EBADFD;
1809         snd_timer_stop(tu->timeri);
1810         tu->timeri->lost = 0;
1811         tu->last_resolution = 0;
1812         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1813 }
1814
1815 static int snd_timer_user_stop(struct file *file)
1816 {
1817         int err;
1818         struct snd_timer_user *tu;
1819
1820         tu = file->private_data;
1821         if (!tu->timeri)
1822                 return -EBADFD;
1823         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1824 }
1825
1826 static int snd_timer_user_continue(struct file *file)
1827 {
1828         int err;
1829         struct snd_timer_user *tu;
1830
1831         tu = file->private_data;
1832         if (!tu->timeri)
1833                 return -EBADFD;
1834         tu->timeri->lost = 0;
1835         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1836 }
1837
1838 static int snd_timer_user_pause(struct file *file)
1839 {
1840         int err;
1841         struct snd_timer_user *tu;
1842
1843         tu = file->private_data;
1844         if (!tu->timeri)
1845                 return -EBADFD;
1846         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1847 }
1848
1849 enum {
1850         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1851         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1852         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1853         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1854 };
1855
1856 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1857                                  unsigned long arg)
1858 {
1859         struct snd_timer_user *tu;
1860         void __user *argp = (void __user *)arg;
1861         int __user *p = argp;
1862
1863         tu = file->private_data;
1864         switch (cmd) {
1865         case SNDRV_TIMER_IOCTL_PVERSION:
1866                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1867         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1868                 return snd_timer_user_next_device(argp);
1869         case SNDRV_TIMER_IOCTL_TREAD:
1870         {
1871                 int xarg;
1872
1873                 if (tu->timeri) /* too late */
1874                         return -EBUSY;
1875                 if (get_user(xarg, p))
1876                         return -EFAULT;
1877                 tu->tread = xarg ? 1 : 0;
1878                 return 0;
1879         }
1880         case SNDRV_TIMER_IOCTL_GINFO:
1881                 return snd_timer_user_ginfo(file, argp);
1882         case SNDRV_TIMER_IOCTL_GPARAMS:
1883                 return snd_timer_user_gparams(file, argp);
1884         case SNDRV_TIMER_IOCTL_GSTATUS:
1885                 return snd_timer_user_gstatus(file, argp);
1886         case SNDRV_TIMER_IOCTL_SELECT:
1887                 return snd_timer_user_tselect(file, argp);
1888         case SNDRV_TIMER_IOCTL_INFO:
1889                 return snd_timer_user_info(file, argp);
1890         case SNDRV_TIMER_IOCTL_PARAMS:
1891                 return snd_timer_user_params(file, argp);
1892         case SNDRV_TIMER_IOCTL_STATUS:
1893                 return snd_timer_user_status(file, argp);
1894         case SNDRV_TIMER_IOCTL_START:
1895         case SNDRV_TIMER_IOCTL_START_OLD:
1896                 return snd_timer_user_start(file);
1897         case SNDRV_TIMER_IOCTL_STOP:
1898         case SNDRV_TIMER_IOCTL_STOP_OLD:
1899                 return snd_timer_user_stop(file);
1900         case SNDRV_TIMER_IOCTL_CONTINUE:
1901         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1902                 return snd_timer_user_continue(file);
1903         case SNDRV_TIMER_IOCTL_PAUSE:
1904         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1905                 return snd_timer_user_pause(file);
1906         }
1907         return -ENOTTY;
1908 }
1909
1910 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1911                                  unsigned long arg)
1912 {
1913         struct snd_timer_user *tu = file->private_data;
1914         long ret;
1915
1916         mutex_lock(&tu->ioctl_lock);
1917         ret = __snd_timer_user_ioctl(file, cmd, arg);
1918         mutex_unlock(&tu->ioctl_lock);
1919         return ret;
1920 }
1921
1922 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1923 {
1924         struct snd_timer_user *tu;
1925
1926         tu = file->private_data;
1927         return fasync_helper(fd, file, on, &tu->fasync);
1928 }
1929
1930 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1931                                    size_t count, loff_t *offset)
1932 {
1933         struct snd_timer_user *tu;
1934         long result = 0, unit;
1935         int qhead;
1936         int err = 0;
1937
1938         tu = file->private_data;
1939         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1940         spin_lock_irq(&tu->qlock);
1941         while ((long)count - result >= unit) {
1942                 while (!tu->qused) {
1943                         wait_queue_t wait;
1944
1945                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1946                                 err = -EAGAIN;
1947                                 goto _error;
1948                         }
1949
1950                         set_current_state(TASK_INTERRUPTIBLE);
1951                         init_waitqueue_entry(&wait, current);
1952                         add_wait_queue(&tu->qchange_sleep, &wait);
1953
1954                         spin_unlock_irq(&tu->qlock);
1955                         schedule();
1956                         spin_lock_irq(&tu->qlock);
1957
1958                         remove_wait_queue(&tu->qchange_sleep, &wait);
1959
1960                         if (tu->disconnected) {
1961                                 err = -ENODEV;
1962                                 goto _error;
1963                         }
1964                         if (signal_pending(current)) {
1965                                 err = -ERESTARTSYS;
1966                                 goto _error;
1967                         }
1968                 }
1969
1970                 qhead = tu->qhead++;
1971                 tu->qhead %= tu->queue_size;
1972                 tu->qused--;
1973                 spin_unlock_irq(&tu->qlock);
1974
1975                 if (tu->tread) {
1976                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1977                                          sizeof(struct snd_timer_tread)))
1978                                 err = -EFAULT;
1979                 } else {
1980                         if (copy_to_user(buffer, &tu->queue[qhead],
1981                                          sizeof(struct snd_timer_read)))
1982                                 err = -EFAULT;
1983                 }
1984
1985                 spin_lock_irq(&tu->qlock);
1986                 if (err < 0)
1987                         goto _error;
1988                 result += unit;
1989                 buffer += unit;
1990         }
1991  _error:
1992         spin_unlock_irq(&tu->qlock);
1993         return result > 0 ? result : err;
1994 }
1995
1996 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1997 {
1998         unsigned int mask;
1999         struct snd_timer_user *tu;
2000
2001         tu = file->private_data;
2002
2003         poll_wait(file, &tu->qchange_sleep, wait);
2004
2005         mask = 0;
2006         if (tu->qused)
2007                 mask |= POLLIN | POLLRDNORM;
2008         if (tu->disconnected)
2009                 mask |= POLLERR;
2010
2011         return mask;
2012 }
2013
2014 #ifdef CONFIG_COMPAT
2015 #include "timer_compat.c"
2016 #else
2017 #define snd_timer_user_ioctl_compat     NULL
2018 #endif
2019
2020 static const struct file_operations snd_timer_f_ops =
2021 {
2022         .owner =        THIS_MODULE,
2023         .read =         snd_timer_user_read,
2024         .open =         snd_timer_user_open,
2025         .release =      snd_timer_user_release,
2026         .llseek =       no_llseek,
2027         .poll =         snd_timer_user_poll,
2028         .unlocked_ioctl =       snd_timer_user_ioctl,
2029         .compat_ioctl = snd_timer_user_ioctl_compat,
2030         .fasync =       snd_timer_user_fasync,
2031 };
2032
2033 /* unregister the system timer */
2034 static void snd_timer_free_all(void)
2035 {
2036         struct snd_timer *timer, *n;
2037
2038         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2039                 snd_timer_free(timer);
2040 }
2041
2042 static struct device timer_dev;
2043
2044 /*
2045  *  ENTRY functions
2046  */
2047
2048 static int __init alsa_timer_init(void)
2049 {
2050         int err;
2051
2052         snd_device_initialize(&timer_dev, NULL);
2053         dev_set_name(&timer_dev, "timer");
2054
2055 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2056         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2057                               "system timer");
2058 #endif
2059
2060         err = snd_timer_register_system();
2061         if (err < 0) {
2062                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2063                 put_device(&timer_dev);
2064                 return err;
2065         }
2066
2067         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2068                                   &snd_timer_f_ops, NULL, &timer_dev);
2069         if (err < 0) {
2070                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2071                 snd_timer_free_all();
2072                 put_device(&timer_dev);
2073                 return err;
2074         }
2075
2076         snd_timer_proc_init();
2077         return 0;
2078 }
2079
2080 static void __exit alsa_timer_exit(void)
2081 {
2082         snd_unregister_device(&timer_dev);
2083         snd_timer_free_all();
2084         put_device(&timer_dev);
2085         snd_timer_proc_done();
2086 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2087         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2088 #endif
2089 }
2090
2091 module_init(alsa_timer_init)
2092 module_exit(alsa_timer_exit)
2093
2094 EXPORT_SYMBOL(snd_timer_open);
2095 EXPORT_SYMBOL(snd_timer_close);
2096 EXPORT_SYMBOL(snd_timer_resolution);
2097 EXPORT_SYMBOL(snd_timer_start);
2098 EXPORT_SYMBOL(snd_timer_stop);
2099 EXPORT_SYMBOL(snd_timer_continue);
2100 EXPORT_SYMBOL(snd_timer_pause);
2101 EXPORT_SYMBOL(snd_timer_new);
2102 EXPORT_SYMBOL(snd_timer_notify);
2103 EXPORT_SYMBOL(snd_timer_global_new);
2104 EXPORT_SYMBOL(snd_timer_global_free);
2105 EXPORT_SYMBOL(snd_timer_global_register);
2106 EXPORT_SYMBOL(snd_timer_interrupt);