sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <[email protected]>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <linux/device.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <linux/sched/signal.h>
  31 #include <sound/core.h>
  32 #include <sound/timer.h>
  33 #include <sound/control.h>
  34 #include <sound/info.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37 #include <linux/kmod.h>
  38
  39 /* internal flags */
  40 #define SNDRV_TIMER_IFLG_PAUSED         0x00010000
  41
  42 #if IS_ENABLED(CONFIG_SND_HRTIMER)
  43 #define DEFAULT_TIMER_LIMIT 4
  44 #else
  45 #define DEFAULT_TIMER_LIMIT 1
  46 #endif
  47
  48 static int timer_limit = DEFAULT_TIMER_LIMIT;
  49 static int timer_tstamp_monotonic = 1;
  50 MODULE_AUTHOR("Jaroslav Kysela <[email protected]>, Takashi Iwai <[email protected]>");
  51 MODULE_DESCRIPTION("ALSA timer interface");
  52 MODULE_LICENSE("GPL");
  53 module_param(timer_limit, int, 0444);
  54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  55 module_param(timer_tstamp_monotonic, int, 0444);
  56 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  57
  58 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  59 MODULE_ALIAS("devname:snd/timer");
  60
  61 struct snd_timer_user {
  62         struct snd_timer_instance *timeri;
  63         int tread;              /* enhanced read with timestamps and events */
  64         unsigned long ticks;
  65         unsigned long overrun;
  66         int qhead;
  67         int qtail;
  68         int qused;
  69         int queue_size;
  70         bool disconnected;
  71         struct snd_timer_read *queue;
  72         struct snd_timer_tread *tqueue;
  73         spinlock_t qlock;
  74         unsigned long last_resolution;
  75         unsigned int filter;
  76         struct timespec tstamp;         /* trigger tstamp */
  77         wait_queue_head_t qchange_sleep;
  78         struct fasync_struct *fasync;
  79         struct mutex ioctl_lock;
  80 };
  81
  82 /* list of timers */
  83 static LIST_HEAD(snd_timer_list);
  84
  85 /* list of slave instances */
  86 static LIST_HEAD(snd_timer_slave_list);
  87
  88 /* lock for slave active lists */
  89 static DEFINE_SPINLOCK(slave_active_lock);
  90
  91 static DEFINE_MUTEX(register_mutex);
  92
  93 static int snd_timer_free(struct snd_timer *timer);
  94 static int snd_timer_dev_free(struct snd_device *device);
  95 static int snd_timer_dev_register(struct snd_device *device);
  96 static int snd_timer_dev_disconnect(struct snd_device *device);
  97
  98 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  99
 100 /*
 101  * create a timer instance with the given owner string.
 102  * when timer is not NULL, increments the module counter
 103  */
 104 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 105                                                          struct snd_timer *timer)
 106 {
 107         struct snd_timer_instance *timeri;
 108         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 109         if (timeri == NULL)
 110                 return NULL;
 111         timeri->owner = kstrdup(owner, GFP_KERNEL);
 112         if (! timeri->owner) {
 113                 kfree(timeri);
 114                 return NULL;
 115         }
 116         INIT_LIST_HEAD(&timeri->open_list);
 117         INIT_LIST_HEAD(&timeri->active_list);
 118         INIT_LIST_HEAD(&timeri->ack_list);
 119         INIT_LIST_HEAD(&timeri->slave_list_head);
 120         INIT_LIST_HEAD(&timeri->slave_active_head);
 121
 122         timeri->timer = timer;
 123         if (timer && !try_module_get(timer->module)) {
 124                 kfree(timeri->owner);
 125                 kfree(timeri);
 126                 return NULL;
 127         }
 128
 129         return timeri;
 130 }
 131
 132 /*
 133  * find a timer instance from the given timer id
 134  */
 135 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 136 {
 137         struct snd_timer *timer = NULL;
 138
 139         list_for_each_entry(timer, &snd_timer_list, device_list) {
 140                 if (timer->tmr_class != tid->dev_class)
 141                         continue;
 142                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 143                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 144                     (timer->card == NULL ||
 145                      timer->card->number != tid->card))
 146                         continue;
 147                 if (timer->tmr_device != tid->device)
 148                         continue;
 149                 if (timer->tmr_subdevice != tid->subdevice)
 150                         continue;
 151                 return timer;
 152         }
 153         return NULL;
 154 }
 155
 156 #ifdef CONFIG_MODULES
 157
 158 static void snd_timer_request(struct snd_timer_id *tid)
 159 {
 160         switch (tid->dev_class) {
 161         case SNDRV_TIMER_CLASS_GLOBAL:
 162                 if (tid->device < timer_limit)
 163                         request_module("snd-timer-%i", tid->device);
 164                 break;
 165         case SNDRV_TIMER_CLASS_CARD:
 166         case SNDRV_TIMER_CLASS_PCM:
 167                 if (tid->card < snd_ecards_limit)
 168                         request_module("snd-card-%i", tid->card);
 169                 break;
 170         default:
 171                 break;
 172         }
 173 }
 174
 175 #endif
 176
 177 /*
 178  * look for a master instance matching with the slave id of the given slave.
 179  * when found, relink the open_link of the slave.
 180  *
 181  * call this with register_mutex down.
 182  */
 183 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 184 {
 185         struct snd_timer *timer;
 186         struct snd_timer_instance *master;
 187
 188         /* FIXME: it's really dumb to look up all entries.. */
 189         list_for_each_entry(timer, &snd_timer_list, device_list) {
 190                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 191                         if (slave->slave_class == master->slave_class &&
 192                             slave->slave_id == master->slave_id) {
 193                                 list_move_tail(&slave->open_list,
 194                                                &master->slave_list_head);
 195                                 spin_lock_irq(&slave_active_lock);
 196                                 slave->master = master;
 197                                 slave->timer = master->timer;
 198                                 spin_unlock_irq(&slave_active_lock);
 199                                 return;
 200                         }
 201                 }
 202         }
 203 }
 204
 205 /*
 206  * look for slave instances matching with the slave id of the given master.
 207  * when found, relink the open_link of slaves.
 208  *
 209  * call this with register_mutex down.
 210  */
 211 static void snd_timer_check_master(struct snd_timer_instance *master)
 212 {
 213         struct snd_timer_instance *slave, *tmp;
 214
 215         /* check all pending slaves */
 216         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 217                 if (slave->slave_class == master->slave_class &&
 218                     slave->slave_id == master->slave_id) {
 219                         list_move_tail(&slave->open_list, &master->slave_list_head);
 220                         spin_lock_irq(&slave_active_lock);
 221                         spin_lock(&master->timer->lock);
 222                         slave->master = master;
 223                         slave->timer = master->timer;
 224                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 225                                 list_add_tail(&slave->active_list,
 226                                               &master->slave_active_head);
 227                         spin_unlock(&master->timer->lock);
 228                         spin_unlock_irq(&slave_active_lock);
 229                 }
 230         }
 231 }
 232
 233 /*
 234  * open a timer instance
 235  * when opening a master, the slave id must be here given.
 236  */
 237 int snd_timer_open(struct snd_timer_instance **ti,
 238                    char *owner, struct snd_timer_id *tid,
 239                    unsigned int slave_id)
 240 {
 241         struct snd_timer *timer;
 242         struct snd_timer_instance *timeri = NULL;
 243
 244         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 245                 /* open a slave instance */
 246                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 247                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 248                         pr_debug("ALSA: timer: invalid slave class %i\n",
 249                                  tid->dev_sclass);
 250                         return -EINVAL;
 251                 }
 252                 mutex_lock(&register_mutex);
 253                 timeri = snd_timer_instance_new(owner, NULL);
 254                 if (!timeri) {
 255                         mutex_unlock(&register_mutex);
 256                         return -ENOMEM;
 257                 }
 258                 timeri->slave_class = tid->dev_sclass;
 259                 timeri->slave_id = tid->device;
 260                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 261                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 262                 snd_timer_check_slave(timeri);
 263                 mutex_unlock(&register_mutex);
 264                 *ti = timeri;
 265                 return 0;
 266         }
 267
 268         /* open a master instance */
 269         mutex_lock(&register_mutex);
 270         timer = snd_timer_find(tid);
 271 #ifdef CONFIG_MODULES
 272         if (!timer) {
 273                 mutex_unlock(&register_mutex);
 274                 snd_timer_request(tid);
 275                 mutex_lock(&register_mutex);
 276                 timer = snd_timer_find(tid);
 277         }
 278 #endif
 279         if (!timer) {
 280                 mutex_unlock(&register_mutex);
 281                 return -ENODEV;
 282         }
 283         if (!list_empty(&timer->open_list_head)) {
 284                 timeri = list_entry(timer->open_list_head.next,
 285                                     struct snd_timer_instance, open_list);
 286                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 287                         mutex_unlock(&register_mutex);
 288                         return -EBUSY;
 289                 }
 290         }
 291         timeri = snd_timer_instance_new(owner, timer);
 292         if (!timeri) {
 293                 mutex_unlock(&register_mutex);
 294                 return -ENOMEM;
 295         }
 296         /* take a card refcount for safe disconnection */
 297         if (timer->card)
 298                 get_device(&timer->card->card_dev);
 299         timeri->slave_class = tid->dev_sclass;
 300         timeri->slave_id = slave_id;
 301
 302         if (list_empty(&timer->open_list_head) && timer->hw.open) {
 303                 int err = timer->hw.open(timer);
 304                 if (err) {
 305                         kfree(timeri->owner);
 306                         kfree(timeri);
 307
 308                         if (timer->card)
 309                                 put_device(&timer->card->card_dev);
 310                         module_put(timer->module);
 311                         mutex_unlock(&register_mutex);
 312                         return err;
 313                 }
 314         }
 315
 316         list_add_tail(&timeri->open_list, &timer->open_list_head);
 317         snd_timer_check_master(timeri);
 318         mutex_unlock(&register_mutex);
 319         *ti = timeri;
 320         return 0;
 321 }
 322 EXPORT_SYMBOL(snd_timer_open);
 323
 324 /*
 325  * close a timer instance
 326  */
 327 int snd_timer_close(struct snd_timer_instance *timeri)
 328 {
 329         struct snd_timer *timer = NULL;
 330         struct snd_timer_instance *slave, *tmp;
 331
 332         if (snd_BUG_ON(!timeri))
 333                 return -ENXIO;
 334
 335         mutex_lock(&register_mutex);
 336         list_del(&timeri->open_list);
 337
 338         /* force to stop the timer */
 339         snd_timer_stop(timeri);
 340
 341         timer = timeri->timer;
 342         if (timer) {
 343                 /* wait, until the active callback is finished */
 344                 spin_lock_irq(&timer->lock);
 345                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 346                         spin_unlock_irq(&timer->lock);
 347                         udelay(10);
 348                         spin_lock_irq(&timer->lock);
 349                 }
 350                 spin_unlock_irq(&timer->lock);
 351
 352                 /* remove slave links */
 353                 spin_lock_irq(&slave_active_lock);
 354                 spin_lock(&timer->lock);
 355                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 356                                          open_list) {
 357                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 358                         slave->master = NULL;
 359                         slave->timer = NULL;
 360                         list_del_init(&slave->ack_list);
 361                         list_del_init(&slave->active_list);
 362                 }
 363                 spin_unlock(&timer->lock);
 364                 spin_unlock_irq(&slave_active_lock);
 365
 366                 /* slave doesn't need to release timer resources below */
 367                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 368                         timer = NULL;
 369         }
 370
 371         if (timeri->private_free)
 372                 timeri->private_free(timeri);
 373         kfree(timeri->owner);
 374         kfree(timeri);
 375
 376         if (timer) {
 377                 if (list_empty(&timer->open_list_head) && timer->hw.close)
 378                         timer->hw.close(timer);
 379                 /* release a card refcount for safe disconnection */
 380                 if (timer->card)
 381                         put_device(&timer->card->card_dev);
 382                 module_put(timer->module);
 383         }
 384
 385         mutex_unlock(&register_mutex);
 386         return 0;
 387 }
 388 EXPORT_SYMBOL(snd_timer_close);
 389
 390 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 391 {
 392         struct snd_timer * timer;
 393
 394         if (timeri == NULL)
 395                 return 0;
 396         timer = timeri->timer;
 397         if (timer) {
 398                 if (timer->hw.c_resolution)
 399                         return timer->hw.c_resolution(timer);
 400                 return timer->hw.resolution;
 401         }
 402         return 0;
 403 }
 404 EXPORT_SYMBOL(snd_timer_resolution);
 405
 406 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 407 {
 408         struct snd_timer *timer;
 409         unsigned long resolution = 0;
 410         struct snd_timer_instance *ts;
 411         struct timespec tstamp;
 412
 413         if (timer_tstamp_monotonic)
 414                 ktime_get_ts(&tstamp);
 415         else
 416                 getnstimeofday(&tstamp);
 417         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 418                        event > SNDRV_TIMER_EVENT_PAUSE))
 419                 return;
 420         if (event == SNDRV_TIMER_EVENT_START ||
 421             event == SNDRV_TIMER_EVENT_CONTINUE)
 422                 resolution = snd_timer_resolution(ti);
 423         if (ti->ccallback)
 424                 ti->ccallback(ti, event, &tstamp, resolution);
 425         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 426                 return;
 427         timer = ti->timer;
 428         if (timer == NULL)
 429                 return;
 430         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 431                 return;
 432         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 433                 if (ts->ccallback)
 434                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 435 }
 436
 437 /* start/continue a master timer */
 438 static int snd_timer_start1(struct snd_timer_instance *timeri,
 439                             bool start, unsigned long ticks)
 440 {
 441         struct snd_timer *timer;
 442         int result;
 443         unsigned long flags;
 444
 445         timer = timeri->timer;
 446         if (!timer)
 447                 return -EINVAL;
 448
 449         spin_lock_irqsave(&timer->lock, flags);
 450         if (timer->card && timer->card->shutdown) {
 451                 result = -ENODEV;
 452                 goto unlock;
 453         }
 454         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 455                              SNDRV_TIMER_IFLG_START)) {
 456                 result = -EBUSY;
 457                 goto unlock;
 458         }
 459
 460         if (start)
 461                 timeri->ticks = timeri->cticks = ticks;
 462         else if (!timeri->cticks)
 463                 timeri->cticks = 1;
 464         timeri->pticks = 0;
 465
 466         list_move_tail(&timeri->active_list, &timer->active_list_head);
 467         if (timer->running) {
 468                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 469                         goto __start_now;
 470                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 471                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 472                 result = 1; /* delayed start */
 473         } else {
 474                 if (start)
 475                         timer->sticks = ticks;
 476                 timer->hw.start(timer);
 477               __start_now:
 478                 timer->running++;
 479                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 480                 result = 0;
 481         }
 482         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 483                           SNDRV_TIMER_EVENT_CONTINUE);
 484  unlock:
 485         spin_unlock_irqrestore(&timer->lock, flags);
 486         return result;
 487 }
 488
 489 /* start/continue a slave timer */
 490 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
 491                                  bool start)
 492 {
 493         unsigned long flags;
 494
 495         spin_lock_irqsave(&slave_active_lock, flags);
 496         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 497                 spin_unlock_irqrestore(&slave_active_lock, flags);
 498                 return -EBUSY;
 499         }
 500         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 501         if (timeri->master && timeri->timer) {
 502                 spin_lock(&timeri->timer->lock);
 503                 list_add_tail(&timeri->active_list,
 504                               &timeri->master->slave_active_head);
 505                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 506                                   SNDRV_TIMER_EVENT_CONTINUE);
 507                 spin_unlock(&timeri->timer->lock);
 508         }
 509         spin_unlock_irqrestore(&slave_active_lock, flags);
 510         return 1; /* delayed start */
 511 }
 512
 513 /* stop/pause a master timer */
 514 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
 515 {
 516         struct snd_timer *timer;
 517         int result = 0;
 518         unsigned long flags;
 519
 520         timer = timeri->timer;
 521         if (!timer)
 522                 return -EINVAL;
 523         spin_lock_irqsave(&timer->lock, flags);
 524         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 525                                SNDRV_TIMER_IFLG_START))) {
 526                 result = -EBUSY;
 527                 goto unlock;
 528         }
 529         list_del_init(&timeri->ack_list);
 530         list_del_init(&timeri->active_list);
 531         if (timer->card && timer->card->shutdown)
 532                 goto unlock;
 533         if (stop) {
 534                 timeri->cticks = timeri->ticks;
 535                 timeri->pticks = 0;
 536         }
 537         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 538             !(--timer->running)) {
 539                 timer->hw.stop(timer);
 540                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 541                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 542                         snd_timer_reschedule(timer, 0);
 543                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 544                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 545                                 timer->hw.start(timer);
 546                         }
 547                 }
 548         }
 549         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 550         if (stop)
 551                 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
 552         else
 553                 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
 554         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 555                           SNDRV_TIMER_EVENT_CONTINUE);
 556  unlock:
 557         spin_unlock_irqrestore(&timer->lock, flags);
 558         return result;
 559 }
 560
 561 /* stop/pause a slave timer */
 562 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
 563 {
 564         unsigned long flags;
 565
 566         spin_lock_irqsave(&slave_active_lock, flags);
 567         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 568                 spin_unlock_irqrestore(&slave_active_lock, flags);
 569                 return -EBUSY;
 570         }
 571         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 572         if (timeri->timer) {
 573                 spin_lock(&timeri->timer->lock);
 574                 list_del_init(&timeri->ack_list);
 575                 list_del_init(&timeri->active_list);
 576                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 577                                   SNDRV_TIMER_EVENT_CONTINUE);
 578                 spin_unlock(&timeri->timer->lock);
 579         }
 580         spin_unlock_irqrestore(&slave_active_lock, flags);
 581         return 0;
 582 }
 583
 584 /*
 585  *  start the timer instance
 586  */
 587 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 588 {
 589         if (timeri == NULL || ticks < 1)
 590                 return -EINVAL;
 591         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 592                 return snd_timer_start_slave(timeri, true);
 593         else
 594                 return snd_timer_start1(timeri, true, ticks);
 595 }
 596 EXPORT_SYMBOL(snd_timer_start);
 597
 598 /*
 599  * stop the timer instance.
 600  *
 601  * do not call this from the timer callback!
 602  */
 603 int snd_timer_stop(struct snd_timer_instance *timeri)
 604 {
 605         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 606                 return snd_timer_stop_slave(timeri, true);
 607         else
 608                 return snd_timer_stop1(timeri, true);
 609 }
 610 EXPORT_SYMBOL(snd_timer_stop);
 611
 612 /*
 613  * start again..  the tick is kept.
 614  */
 615 int snd_timer_continue(struct snd_timer_instance *timeri)
 616 {
 617         /* timer can continue only after pause */
 618         if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
 619                 return -EINVAL;
 620
 621         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 622                 return snd_timer_start_slave(timeri, false);
 623         else
 624                 return snd_timer_start1(timeri, false, 0);
 625 }
 626 EXPORT_SYMBOL(snd_timer_continue);
 627
 628 /*
 629  * pause.. remember the ticks left
 630  */
 631 int snd_timer_pause(struct snd_timer_instance * timeri)
 632 {
 633         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 634                 return snd_timer_stop_slave(timeri, false);
 635         else
 636                 return snd_timer_stop1(timeri, false);
 637 }
 638 EXPORT_SYMBOL(snd_timer_pause);
 639
 640 /*
 641  * reschedule the timer
 642  *
 643  * start pending instances and check the scheduling ticks.
 644  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 645  */
 646 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 647 {
 648         struct snd_timer_instance *ti;
 649         unsigned long ticks = ~0UL;
 650
 651         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 652                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 653                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 654                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 655                         timer->running++;
 656                 }
 657                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 658                         if (ticks > ti->cticks)
 659                                 ticks = ti->cticks;
 660                 }
 661         }
 662         if (ticks == ~0UL) {
 663                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 664                 return;
 665         }
 666         if (ticks > timer->hw.ticks)
 667                 ticks = timer->hw.ticks;
 668         if (ticks_left != ticks)
 669                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 670         timer->sticks = ticks;
 671 }
 672
 673 /*
 674  * timer tasklet
 675  *
 676  */
 677 static void snd_timer_tasklet(unsigned long arg)
 678 {
 679         struct snd_timer *timer = (struct snd_timer *) arg;
 680         struct snd_timer_instance *ti;
 681         struct list_head *p;
 682         unsigned long resolution, ticks;
 683         unsigned long flags;
 684
 685         if (timer->card && timer->card->shutdown)
 686                 return;
 687
 688         spin_lock_irqsave(&timer->lock, flags);
 689         /* now process all callbacks */
 690         while (!list_empty(&timer->sack_list_head)) {
 691                 p = timer->sack_list_head.next;         /* get first item */
 692                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 693
 694                 /* remove from ack_list and make empty */
 695                 list_del_init(p);
 696
 697                 ticks = ti->pticks;
 698                 ti->pticks = 0;
 699                 resolution = ti->resolution;
 700
 701                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 702                 spin_unlock(&timer->lock);
 703                 if (ti->callback)
 704                         ti->callback(ti, resolution, ticks);
 705                 spin_lock(&timer->lock);
 706                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 707         }
 708         spin_unlock_irqrestore(&timer->lock, flags);
 709 }
 710
 711 /*
 712  * timer interrupt
 713  *
 714  * ticks_left is usually equal to timer->sticks.
 715  *
 716  */
 717 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 718 {
 719         struct snd_timer_instance *ti, *ts, *tmp;
 720         unsigned long resolution, ticks;
 721         struct list_head *p, *ack_list_head;
 722         unsigned long flags;
 723         int use_tasklet = 0;
 724
 725         if (timer == NULL)
 726                 return;
 727
 728         if (timer->card && timer->card->shutdown)
 729                 return;
 730
 731         spin_lock_irqsave(&timer->lock, flags);
 732
 733         /* remember the current resolution */
 734         if (timer->hw.c_resolution)
 735                 resolution = timer->hw.c_resolution(timer);
 736         else
 737                 resolution = timer->hw.resolution;
 738
 739         /* loop for all active instances
 740          * Here we cannot use list_for_each_entry because the active_list of a
 741          * processed instance is relinked to done_list_head before the callback
 742          * is called.
 743          */
 744         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 745                                  active_list) {
 746                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 747                         continue;
 748                 ti->pticks += ticks_left;
 749                 ti->resolution = resolution;
 750                 if (ti->cticks < ticks_left)
 751                         ti->cticks = 0;
 752                 else
 753                         ti->cticks -= ticks_left;
 754                 if (ti->cticks) /* not expired */
 755                         continue;
 756                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 757                         ti->cticks = ti->ticks;
 758                 } else {
 759                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 760                         --timer->running;
 761                         list_del_init(&ti->active_list);
 762                 }
 763                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 764                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 765                         ack_list_head = &timer->ack_list_head;
 766                 else
 767                         ack_list_head = &timer->sack_list_head;
 768                 if (list_empty(&ti->ack_list))
 769                         list_add_tail(&ti->ack_list, ack_list_head);
 770                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 771                         ts->pticks = ti->pticks;
 772                         ts->resolution = resolution;
 773                         if (list_empty(&ts->ack_list))
 774                                 list_add_tail(&ts->ack_list, ack_list_head);
 775                 }
 776         }
 777         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 778                 snd_timer_reschedule(timer, timer->sticks);
 779         if (timer->running) {
 780                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 781                         timer->hw.stop(timer);
 782                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 783                 }
 784                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 785                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 786                         /* restart timer */
 787                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 788                         timer->hw.start(timer);
 789                 }
 790         } else {
 791                 timer->hw.stop(timer);
 792         }
 793
 794         /* now process all fast callbacks */
 795         while (!list_empty(&timer->ack_list_head)) {
 796                 p = timer->ack_list_head.next;          /* get first item */
 797                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 798
 799                 /* remove from ack_list and make empty */
 800                 list_del_init(p);
 801
 802                 ticks = ti->pticks;
 803                 ti->pticks = 0;
 804
 805                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 806                 spin_unlock(&timer->lock);
 807                 if (ti->callback)
 808                         ti->callback(ti, resolution, ticks);
 809                 spin_lock(&timer->lock);
 810                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 811         }
 812
 813         /* do we have any slow callbacks? */
 814         use_tasklet = !list_empty(&timer->sack_list_head);
 815         spin_unlock_irqrestore(&timer->lock, flags);
 816
 817         if (use_tasklet)
 818                 tasklet_schedule(&timer->task_queue);
 819 }
 820 EXPORT_SYMBOL(snd_timer_interrupt);
 821
 822 /*
 823
 824  */
 825
 826 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 827                   struct snd_timer **rtimer)
 828 {
 829         struct snd_timer *timer;
 830         int err;
 831         static struct snd_device_ops ops = {
 832                 .dev_free = snd_timer_dev_free,
 833                 .dev_register = snd_timer_dev_register,
 834                 .dev_disconnect = snd_timer_dev_disconnect,
 835         };
 836
 837         if (snd_BUG_ON(!tid))
 838                 return -EINVAL;
 839         if (rtimer)
 840                 *rtimer = NULL;
 841         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 842         if (!timer)
 843                 return -ENOMEM;
 844         timer->tmr_class = tid->dev_class;
 845         timer->card = card;
 846         timer->tmr_device = tid->device;
 847         timer->tmr_subdevice = tid->subdevice;
 848         if (id)
 849                 strlcpy(timer->id, id, sizeof(timer->id));
 850         timer->sticks = 1;
 851         INIT_LIST_HEAD(&timer->device_list);
 852         INIT_LIST_HEAD(&timer->open_list_head);
 853         INIT_LIST_HEAD(&timer->active_list_head);
 854         INIT_LIST_HEAD(&timer->ack_list_head);
 855         INIT_LIST_HEAD(&timer->sack_list_head);
 856         spin_lock_init(&timer->lock);
 857         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 858                      (unsigned long)timer);
 859         if (card != NULL) {
 860                 timer->module = card->module;
 861                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 862                 if (err < 0) {
 863                         snd_timer_free(timer);
 864                         return err;
 865                 }
 866         }
 867         if (rtimer)
 868                 *rtimer = timer;
 869         return 0;
 870 }
 871 EXPORT_SYMBOL(snd_timer_new);
 872
 873 static int snd_timer_free(struct snd_timer *timer)
 874 {
 875         if (!timer)
 876                 return 0;
 877
 878         mutex_lock(&register_mutex);
 879         if (! list_empty(&timer->open_list_head)) {
 880                 struct list_head *p, *n;
 881                 struct snd_timer_instance *ti;
 882                 pr_warn("ALSA: timer %p is busy?\n", timer);
 883                 list_for_each_safe(p, n, &timer->open_list_head) {
 884                         list_del_init(p);
 885                         ti = list_entry(p, struct snd_timer_instance, open_list);
 886                         ti->timer = NULL;
 887                 }
 888         }
 889         list_del(&timer->device_list);
 890         mutex_unlock(&register_mutex);
 891
 892         if (timer->private_free)
 893                 timer->private_free(timer);
 894         kfree(timer);
 895         return 0;
 896 }
 897
 898 static int snd_timer_dev_free(struct snd_device *device)
 899 {
 900         struct snd_timer *timer = device->device_data;
 901         return snd_timer_free(timer);
 902 }
 903
 904 static int snd_timer_dev_register(struct snd_device *dev)
 905 {
 906         struct snd_timer *timer = dev->device_data;
 907         struct snd_timer *timer1;
 908
 909         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 910                 return -ENXIO;
 911         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 912             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 913                 return -EINVAL;
 914
 915         mutex_lock(&register_mutex);
 916         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 917                 if (timer1->tmr_class > timer->tmr_class)
 918                         break;
 919                 if (timer1->tmr_class < timer->tmr_class)
 920                         continue;
 921                 if (timer1->card && timer->card) {
 922                         if (timer1->card->number > timer->card->number)
 923                                 break;
 924                         if (timer1->card->number < timer->card->number)
 925                                 continue;
 926                 }
 927                 if (timer1->tmr_device > timer->tmr_device)
 928                         break;
 929                 if (timer1->tmr_device < timer->tmr_device)
 930                         continue;
 931                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 932                         break;
 933                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 934                         continue;
 935                 /* conflicts.. */
 936                 mutex_unlock(&register_mutex);
 937                 return -EBUSY;
 938         }
 939         list_add_tail(&timer->device_list, &timer1->device_list);
 940         mutex_unlock(&register_mutex);
 941         return 0;
 942 }
 943
 944 static int snd_timer_dev_disconnect(struct snd_device *device)
 945 {
 946         struct snd_timer *timer = device->device_data;
 947         struct snd_timer_instance *ti;
 948
 949         mutex_lock(&register_mutex);
 950         list_del_init(&timer->device_list);
 951         /* wake up pending sleepers */
 952         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 953                 if (ti->disconnect)
 954                         ti->disconnect(ti);
 955         }
 956         mutex_unlock(&register_mutex);
 957         return 0;
 958 }
 959
 960 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 961 {
 962         unsigned long flags;
 963         unsigned long resolution = 0;
 964         struct snd_timer_instance *ti, *ts;
 965
 966         if (timer->card && timer->card->shutdown)
 967                 return;
 968         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 969                 return;
 970         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 971                        event > SNDRV_TIMER_EVENT_MRESUME))
 972                 return;
 973         spin_lock_irqsave(&timer->lock, flags);
 974         if (event == SNDRV_TIMER_EVENT_MSTART ||
 975             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 976             event == SNDRV_TIMER_EVENT_MRESUME) {
 977                 if (timer->hw.c_resolution)
 978                         resolution = timer->hw.c_resolution(timer);
 979                 else
 980                         resolution = timer->hw.resolution;
 981         }
 982         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 983                 if (ti->ccallback)
 984                         ti->ccallback(ti, event, tstamp, resolution);
 985                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 986                         if (ts->ccallback)
 987                                 ts->ccallback(ts, event, tstamp, resolution);
 988         }
 989         spin_unlock_irqrestore(&timer->lock, flags);
 990 }
 991 EXPORT_SYMBOL(snd_timer_notify);
 992
 993 /*
 994  * exported functions for global timers
 995  */
 996 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 997 {
 998         struct snd_timer_id tid;
 999
1000         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1001         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1002         tid.card = -1;
1003         tid.device = device;
1004         tid.subdevice = 0;
1005         return snd_timer_new(NULL, id, &tid, rtimer);
1006 }
1007 EXPORT_SYMBOL(snd_timer_global_new);
1008
1009 int snd_timer_global_free(struct snd_timer *timer)
1010 {
1011         return snd_timer_free(timer);
1012 }
1013 EXPORT_SYMBOL(snd_timer_global_free);
1014
1015 int snd_timer_global_register(struct snd_timer *timer)
1016 {
1017         struct snd_device dev;
1018
1019         memset(&dev, 0, sizeof(dev));
1020         dev.device_data = timer;
1021         return snd_timer_dev_register(&dev);
1022 }
1023 EXPORT_SYMBOL(snd_timer_global_register);
1024
1025 /*
1026  *  System timer
1027  */
1028
1029 struct snd_timer_system_private {
1030         struct timer_list tlist;
1031         unsigned long last_expires;
1032         unsigned long last_jiffies;
1033         unsigned long correction;
1034 };
1035
1036 static void snd_timer_s_function(unsigned long data)
1037 {
1038         struct snd_timer *timer = (struct snd_timer *)data;
1039         struct snd_timer_system_private *priv = timer->private_data;
1040         unsigned long jiff = jiffies;
1041         if (time_after(jiff, priv->last_expires))
1042                 priv->correction += (long)jiff - (long)priv->last_expires;
1043         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1044 }
1045
1046 static int snd_timer_s_start(struct snd_timer * timer)
1047 {
1048         struct snd_timer_system_private *priv;
1049         unsigned long njiff;
1050
1051         priv = (struct snd_timer_system_private *) timer->private_data;
1052         njiff = (priv->last_jiffies = jiffies);
1053         if (priv->correction > timer->sticks - 1) {
1054                 priv->correction -= timer->sticks - 1;
1055                 njiff++;
1056         } else {
1057                 njiff += timer->sticks - priv->correction;
1058                 priv->correction = 0;
1059         }
1060         priv->last_expires = njiff;
1061         mod_timer(&priv->tlist, njiff);
1062         return 0;
1063 }
1064
1065 static int snd_timer_s_stop(struct snd_timer * timer)
1066 {
1067         struct snd_timer_system_private *priv;
1068         unsigned long jiff;
1069
1070         priv = (struct snd_timer_system_private *) timer->private_data;
1071         del_timer(&priv->tlist);
1072         jiff = jiffies;
1073         if (time_before(jiff, priv->last_expires))
1074                 timer->sticks = priv->last_expires - jiff;
1075         else
1076                 timer->sticks = 1;
1077         priv->correction = 0;
1078         return 0;
1079 }
1080
1081 static int snd_timer_s_close(struct snd_timer *timer)
1082 {
1083         struct snd_timer_system_private *priv;
1084
1085         priv = (struct snd_timer_system_private *)timer->private_data;
1086         del_timer_sync(&priv->tlist);
1087         return 0;
1088 }
1089
1090 static struct snd_timer_hardware snd_timer_system =
1091 {
1092         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1093         .resolution =   1000000000L / HZ,
1094         .ticks =        10000000L,
1095         .close =        snd_timer_s_close,
1096         .start =        snd_timer_s_start,
1097         .stop =         snd_timer_s_stop
1098 };
1099
1100 static void snd_timer_free_system(struct snd_timer *timer)
1101 {
1102         kfree(timer->private_data);
1103 }
1104
1105 static int snd_timer_register_system(void)
1106 {
1107         struct snd_timer *timer;
1108         struct snd_timer_system_private *priv;
1109         int err;
1110
1111         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1112         if (err < 0)
1113                 return err;
1114         strcpy(timer->name, "system timer");
1115         timer->hw = snd_timer_system;
1116         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1117         if (priv == NULL) {
1118                 snd_timer_free(timer);
1119                 return -ENOMEM;
1120         }
1121         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1122         timer->private_data = priv;
1123         timer->private_free = snd_timer_free_system;
1124         return snd_timer_global_register(timer);
1125 }
1126
1127 #ifdef CONFIG_SND_PROC_FS
1128 /*
1129  *  Info interface
1130  */
1131
1132 static void snd_timer_proc_read(struct snd_info_entry *entry,
1133                                 struct snd_info_buffer *buffer)
1134 {
1135         struct snd_timer *timer;
1136         struct snd_timer_instance *ti;
1137
1138         mutex_lock(&register_mutex);
1139         list_for_each_entry(timer, &snd_timer_list, device_list) {
1140                 if (timer->card && timer->card->shutdown)
1141                         continue;
1142                 switch (timer->tmr_class) {
1143                 case SNDRV_TIMER_CLASS_GLOBAL:
1144                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1145                         break;
1146                 case SNDRV_TIMER_CLASS_CARD:
1147                         snd_iprintf(buffer, "C%i-%i: ",
1148                                     timer->card->number, timer->tmr_device);
1149                         break;
1150                 case SNDRV_TIMER_CLASS_PCM:
1151                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1152                                     timer->tmr_device, timer->tmr_subdevice);
1153                         break;
1154                 default:
1155                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1156                                     timer->card ? timer->card->number : -1,
1157                                     timer->tmr_device, timer->tmr_subdevice);
1158                 }
1159                 snd_iprintf(buffer, "%s :", timer->name);
1160                 if (timer->hw.resolution)
1161                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1162                                     timer->hw.resolution / 1000,
1163                                     timer->hw.resolution % 1000,
1164                                     timer->hw.ticks);
1165                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1166                         snd_iprintf(buffer, " SLAVE");
1167                 snd_iprintf(buffer, "\n");
1168                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1169                         snd_iprintf(buffer, "  Client %s : %s\n",
1170                                     ti->owner ? ti->owner : "unknown",
1171                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1172                                                  SNDRV_TIMER_IFLG_RUNNING)
1173                                     ? "running" : "stopped");
1174         }
1175         mutex_unlock(&register_mutex);
1176 }
1177
1178 static struct snd_info_entry *snd_timer_proc_entry;
1179
1180 static void __init snd_timer_proc_init(void)
1181 {
1182         struct snd_info_entry *entry;
1183
1184         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1185         if (entry != NULL) {
1186                 entry->c.text.read = snd_timer_proc_read;
1187                 if (snd_info_register(entry) < 0) {
1188                         snd_info_free_entry(entry);
1189                         entry = NULL;
1190                 }
1191         }
1192         snd_timer_proc_entry = entry;
1193 }
1194
1195 static void __exit snd_timer_proc_done(void)
1196 {
1197         snd_info_free_entry(snd_timer_proc_entry);
1198 }
1199 #else /* !CONFIG_SND_PROC_FS */
1200 #define snd_timer_proc_init()
1201 #define snd_timer_proc_done()
1202 #endif
1203
1204 /*
1205  *  USER SPACE interface
1206  */
1207
1208 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1209                                      unsigned long resolution,
1210                                      unsigned long ticks)
1211 {
1212         struct snd_timer_user *tu = timeri->callback_data;
1213         struct snd_timer_read *r;
1214         int prev;
1215
1216         spin_lock(&tu->qlock);
1217         if (tu->qused > 0) {
1218                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1219                 r = &tu->queue[prev];
1220                 if (r->resolution == resolution) {
1221                         r->ticks += ticks;
1222                         goto __wake;
1223                 }
1224         }
1225         if (tu->qused >= tu->queue_size) {
1226                 tu->overrun++;
1227         } else {
1228                 r = &tu->queue[tu->qtail++];
1229                 tu->qtail %= tu->queue_size;
1230                 r->resolution = resolution;
1231                 r->ticks = ticks;
1232                 tu->qused++;
1233         }
1234       __wake:
1235         spin_unlock(&tu->qlock);
1236         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1237         wake_up(&tu->qchange_sleep);
1238 }
1239
1240 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1241                                             struct snd_timer_tread *tread)
1242 {
1243         if (tu->qused >= tu->queue_size) {
1244                 tu->overrun++;
1245         } else {
1246                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1247                 tu->qtail %= tu->queue_size;
1248                 tu->qused++;
1249         }
1250 }
1251
1252 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1253                                      int event,
1254                                      struct timespec *tstamp,
1255                                      unsigned long resolution)
1256 {
1257         struct snd_timer_user *tu = timeri->callback_data;
1258         struct snd_timer_tread r1;
1259         unsigned long flags;
1260
1261         if (event >= SNDRV_TIMER_EVENT_START &&
1262             event <= SNDRV_TIMER_EVENT_PAUSE)
1263                 tu->tstamp = *tstamp;
1264         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1265                 return;
1266         memset(&r1, 0, sizeof(r1));
1267         r1.event = event;
1268         r1.tstamp = *tstamp;
1269         r1.val = resolution;
1270         spin_lock_irqsave(&tu->qlock, flags);
1271         snd_timer_user_append_to_tqueue(tu, &r1);
1272         spin_unlock_irqrestore(&tu->qlock, flags);
1273         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1274         wake_up(&tu->qchange_sleep);
1275 }
1276
1277 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1278 {
1279         struct snd_timer_user *tu = timeri->callback_data;
1280
1281         tu->disconnected = true;
1282         wake_up(&tu->qchange_sleep);
1283 }
1284
1285 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1286                                       unsigned long resolution,
1287                                       unsigned long ticks)
1288 {
1289         struct snd_timer_user *tu = timeri->callback_data;
1290         struct snd_timer_tread *r, r1;
1291         struct timespec tstamp;
1292         int prev, append = 0;
1293
1294         memset(&r1, 0, sizeof(r1));
1295         memset(&tstamp, 0, sizeof(tstamp));
1296         spin_lock(&tu->qlock);
1297         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1298                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1299                 spin_unlock(&tu->qlock);
1300                 return;
1301         }
1302         if (tu->last_resolution != resolution || ticks > 0) {
1303                 if (timer_tstamp_monotonic)
1304                         ktime_get_ts(&tstamp);
1305                 else
1306                         getnstimeofday(&tstamp);
1307         }
1308         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1309             tu->last_resolution != resolution) {
1310                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1311                 r1.tstamp = tstamp;
1312                 r1.val = resolution;
1313                 snd_timer_user_append_to_tqueue(tu, &r1);
1314                 tu->last_resolution = resolution;
1315                 append++;
1316         }
1317         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1318                 goto __wake;
1319         if (ticks == 0)
1320                 goto __wake;
1321         if (tu->qused > 0) {
1322                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1323                 r = &tu->tqueue[prev];
1324                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1325                         r->tstamp = tstamp;
1326                         r->val += ticks;
1327                         append++;
1328                         goto __wake;
1329                 }
1330         }
1331         r1.event = SNDRV_TIMER_EVENT_TICK;
1332         r1.tstamp = tstamp;
1333         r1.val = ticks;
1334         snd_timer_user_append_to_tqueue(tu, &r1);
1335         append++;
1336       __wake:
1337         spin_unlock(&tu->qlock);
1338         if (append == 0)
1339                 return;
1340         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1341         wake_up(&tu->qchange_sleep);
1342 }
1343
1344 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1345 {
1346         struct snd_timer_read *queue = NULL;
1347         struct snd_timer_tread *tqueue = NULL;
1348
1349         if (tu->tread) {
1350                 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1351                 if (!tqueue)
1352                         return -ENOMEM;
1353         } else {
1354                 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1355                 if (!queue)
1356                         return -ENOMEM;
1357         }
1358
1359         spin_lock_irq(&tu->qlock);
1360         kfree(tu->queue);
1361         kfree(tu->tqueue);
1362         tu->queue_size = size;
1363         tu->queue = queue;
1364         tu->tqueue = tqueue;
1365         tu->qhead = tu->qtail = tu->qused = 0;
1366         spin_unlock_irq(&tu->qlock);
1367
1368         return 0;
1369 }
1370
1371 static int snd_timer_user_open(struct inode *inode, struct file *file)
1372 {
1373         struct snd_timer_user *tu;
1374         int err;
1375
1376         err = nonseekable_open(inode, file);
1377         if (err < 0)
1378                 return err;
1379
1380         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1381         if (tu == NULL)
1382                 return -ENOMEM;
1383         spin_lock_init(&tu->qlock);
1384         init_waitqueue_head(&tu->qchange_sleep);
1385         mutex_init(&tu->ioctl_lock);
1386         tu->ticks = 1;
1387         if (realloc_user_queue(tu, 128) < 0) {
1388                 kfree(tu);
1389                 return -ENOMEM;
1390         }
1391         file->private_data = tu;
1392         return 0;
1393 }
1394
1395 static int snd_timer_user_release(struct inode *inode, struct file *file)
1396 {
1397         struct snd_timer_user *tu;
1398
1399         if (file->private_data) {
1400                 tu = file->private_data;
1401                 file->private_data = NULL;
1402                 mutex_lock(&tu->ioctl_lock);
1403                 if (tu->timeri)
1404                         snd_timer_close(tu->timeri);
1405                 mutex_unlock(&tu->ioctl_lock);
1406                 kfree(tu->queue);
1407                 kfree(tu->tqueue);
1408                 kfree(tu);
1409         }
1410         return 0;
1411 }
1412
1413 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1414 {
1415         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1416         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1417         id->card = -1;
1418         id->device = -1;
1419         id->subdevice = -1;
1420 }
1421
1422 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1423 {
1424         id->dev_class = timer->tmr_class;
1425         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1426         id->card = timer->card ? timer->card->number : -1;
1427         id->device = timer->tmr_device;
1428         id->subdevice = timer->tmr_subdevice;
1429 }
1430
1431 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1432 {
1433         struct snd_timer_id id;
1434         struct snd_timer *timer;
1435         struct list_head *p;
1436
1437         if (copy_from_user(&id, _tid, sizeof(id)))
1438                 return -EFAULT;
1439         mutex_lock(&register_mutex);
1440         if (id.dev_class < 0) {         /* first item */
1441                 if (list_empty(&snd_timer_list))
1442                         snd_timer_user_zero_id(&id);
1443                 else {
1444                         timer = list_entry(snd_timer_list.next,
1445                                            struct snd_timer, device_list);
1446                         snd_timer_user_copy_id(&id, timer);
1447                 }
1448         } else {
1449                 switch (id.dev_class) {
1450                 case SNDRV_TIMER_CLASS_GLOBAL:
1451                         id.device = id.device < 0 ? 0 : id.device + 1;
1452                         list_for_each(p, &snd_timer_list) {
1453                                 timer = list_entry(p, struct snd_timer, device_list);
1454                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1455                                         snd_timer_user_copy_id(&id, timer);
1456                                         break;
1457                                 }
1458                                 if (timer->tmr_device >= id.device) {
1459                                         snd_timer_user_copy_id(&id, timer);
1460                                         break;
1461                                 }
1462                         }
1463                         if (p == &snd_timer_list)
1464                                 snd_timer_user_zero_id(&id);
1465                         break;
1466                 case SNDRV_TIMER_CLASS_CARD:
1467                 case SNDRV_TIMER_CLASS_PCM:
1468                         if (id.card < 0) {
1469                                 id.card = 0;
1470                         } else {
1471                                 if (id.device < 0) {
1472                                         id.device = 0;
1473                                 } else {
1474                                         if (id.subdevice < 0)
1475                                                 id.subdevice = 0;
1476                                         else
1477                                                 id.subdevice++;
1478                                 }
1479                         }
1480                         list_for_each(p, &snd_timer_list) {
1481                                 timer = list_entry(p, struct snd_timer, device_list);
1482                                 if (timer->tmr_class > id.dev_class) {
1483                                         snd_timer_user_copy_id(&id, timer);
1484                                         break;
1485                                 }
1486                                 if (timer->tmr_class < id.dev_class)
1487                                         continue;
1488                                 if (timer->card->number > id.card) {
1489                                         snd_timer_user_copy_id(&id, timer);
1490                                         break;
1491                                 }
1492                                 if (timer->card->number < id.card)
1493                                         continue;
1494                                 if (timer->tmr_device > id.device) {
1495                                         snd_timer_user_copy_id(&id, timer);
1496                                         break;
1497                                 }
1498                                 if (timer->tmr_device < id.device)
1499                                         continue;
1500                                 if (timer->tmr_subdevice > id.subdevice) {
1501                                         snd_timer_user_copy_id(&id, timer);
1502                                         break;
1503                                 }
1504                                 if (timer->tmr_subdevice < id.subdevice)
1505                                         continue;
1506                                 snd_timer_user_copy_id(&id, timer);
1507                                 break;
1508                         }
1509                         if (p == &snd_timer_list)
1510                                 snd_timer_user_zero_id(&id);
1511                         break;
1512                 default:
1513                         snd_timer_user_zero_id(&id);
1514                 }
1515         }
1516         mutex_unlock(&register_mutex);
1517         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1518                 return -EFAULT;
1519         return 0;
1520 }
1521
1522 static int snd_timer_user_ginfo(struct file *file,
1523                                 struct snd_timer_ginfo __user *_ginfo)
1524 {
1525         struct snd_timer_ginfo *ginfo;
1526         struct snd_timer_id tid;
1527         struct snd_timer *t;
1528         struct list_head *p;
1529         int err = 0;
1530
1531         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1532         if (IS_ERR(ginfo))
1533                 return PTR_ERR(ginfo);
1534
1535         tid = ginfo->tid;
1536         memset(ginfo, 0, sizeof(*ginfo));
1537         ginfo->tid = tid;
1538         mutex_lock(&register_mutex);
1539         t = snd_timer_find(&tid);
1540         if (t != NULL) {
1541                 ginfo->card = t->card ? t->card->number : -1;
1542                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1543                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1544                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1545                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1546                 ginfo->resolution = t->hw.resolution;
1547                 if (t->hw.resolution_min > 0) {
1548                         ginfo->resolution_min = t->hw.resolution_min;
1549                         ginfo->resolution_max = t->hw.resolution_max;
1550                 }
1551                 list_for_each(p, &t->open_list_head) {
1552                         ginfo->clients++;
1553                 }
1554         } else {
1555                 err = -ENODEV;
1556         }
1557         mutex_unlock(&register_mutex);
1558         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1559                 err = -EFAULT;
1560         kfree(ginfo);
1561         return err;
1562 }
1563
1564 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1565 {
1566         struct snd_timer *t;
1567         int err;
1568
1569         mutex_lock(&register_mutex);
1570         t = snd_timer_find(&gparams->tid);
1571         if (!t) {
1572                 err = -ENODEV;
1573                 goto _error;
1574         }
1575         if (!list_empty(&t->open_list_head)) {
1576                 err = -EBUSY;
1577                 goto _error;
1578         }
1579         if (!t->hw.set_period) {
1580                 err = -ENOSYS;
1581                 goto _error;
1582         }
1583         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1584 _error:
1585         mutex_unlock(&register_mutex);
1586         return err;
1587 }
1588
1589 static int snd_timer_user_gparams(struct file *file,
1590                                   struct snd_timer_gparams __user *_gparams)
1591 {
1592         struct snd_timer_gparams gparams;
1593
1594         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1595                 return -EFAULT;
1596         return timer_set_gparams(&gparams);
1597 }
1598
1599 static int snd_timer_user_gstatus(struct file *file,
1600                                   struct snd_timer_gstatus __user *_gstatus)
1601 {
1602         struct snd_timer_gstatus gstatus;
1603         struct snd_timer_id tid;
1604         struct snd_timer *t;
1605         int err = 0;
1606
1607         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1608                 return -EFAULT;
1609         tid = gstatus.tid;
1610         memset(&gstatus, 0, sizeof(gstatus));
1611         gstatus.tid = tid;
1612         mutex_lock(&register_mutex);
1613         t = snd_timer_find(&tid);
1614         if (t != NULL) {
1615                 if (t->hw.c_resolution)
1616                         gstatus.resolution = t->hw.c_resolution(t);
1617                 else
1618                         gstatus.resolution = t->hw.resolution;
1619                 if (t->hw.precise_resolution) {
1620                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1621                                                  &gstatus.resolution_den);
1622                 } else {
1623                         gstatus.resolution_num = gstatus.resolution;
1624                         gstatus.resolution_den = 1000000000uL;
1625                 }
1626         } else {
1627                 err = -ENODEV;
1628         }
1629         mutex_unlock(&register_mutex);
1630         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1631                 err = -EFAULT;
1632         return err;
1633 }
1634
1635 static int snd_timer_user_tselect(struct file *file,
1636                                   struct snd_timer_select __user *_tselect)
1637 {
1638         struct snd_timer_user *tu;
1639         struct snd_timer_select tselect;
1640         char str[32];
1641         int err = 0;
1642
1643         tu = file->private_data;
1644         if (tu->timeri) {
1645                 snd_timer_close(tu->timeri);
1646                 tu->timeri = NULL;
1647         }
1648         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1649                 err = -EFAULT;
1650                 goto __err;
1651         }
1652         sprintf(str, "application %i", current->pid);
1653         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1654                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1655         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1656         if (err < 0)
1657                 goto __err;
1658
1659         tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1660         tu->timeri->callback = tu->tread
1661                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1662         tu->timeri->ccallback = snd_timer_user_ccallback;
1663         tu->timeri->callback_data = (void *)tu;
1664         tu->timeri->disconnect = snd_timer_user_disconnect;
1665
1666       __err:
1667         return err;
1668 }
1669
1670 static int snd_timer_user_info(struct file *file,
1671                                struct snd_timer_info __user *_info)
1672 {
1673         struct snd_timer_user *tu;
1674         struct snd_timer_info *info;
1675         struct snd_timer *t;
1676         int err = 0;
1677
1678         tu = file->private_data;
1679         if (!tu->timeri)
1680                 return -EBADFD;
1681         t = tu->timeri->timer;
1682         if (!t)
1683                 return -EBADFD;
1684
1685         info = kzalloc(sizeof(*info), GFP_KERNEL);
1686         if (! info)
1687                 return -ENOMEM;
1688         info->card = t->card ? t->card->number : -1;
1689         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1690                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1691         strlcpy(info->id, t->id, sizeof(info->id));
1692         strlcpy(info->name, t->name, sizeof(info->name));
1693         info->resolution = t->hw.resolution;
1694         if (copy_to_user(_info, info, sizeof(*_info)))
1695                 err = -EFAULT;
1696         kfree(info);
1697         return err;
1698 }
1699
1700 static int snd_timer_user_params(struct file *file,
1701                                  struct snd_timer_params __user *_params)
1702 {
1703         struct snd_timer_user *tu;
1704         struct snd_timer_params params;
1705         struct snd_timer *t;
1706         int err;
1707
1708         tu = file->private_data;
1709         if (!tu->timeri)
1710                 return -EBADFD;
1711         t = tu->timeri->timer;
1712         if (!t)
1713                 return -EBADFD;
1714         if (copy_from_user(&params, _params, sizeof(params)))
1715                 return -EFAULT;
1716         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1717                 u64 resolution;
1718
1719                 if (params.ticks < 1) {
1720                         err = -EINVAL;
1721                         goto _end;
1722                 }
1723
1724                 /* Don't allow resolution less than 1ms */
1725                 resolution = snd_timer_resolution(tu->timeri);
1726                 resolution *= params.ticks;
1727                 if (resolution < 1000000) {
1728                         err = -EINVAL;
1729                         goto _end;
1730                 }
1731         }
1732         if (params.queue_size > 0 &&
1733             (params.queue_size < 32 || params.queue_size > 1024)) {
1734                 err = -EINVAL;
1735                 goto _end;
1736         }
1737         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1738                               (1<<SNDRV_TIMER_EVENT_TICK)|
1739                               (1<<SNDRV_TIMER_EVENT_START)|
1740                               (1<<SNDRV_TIMER_EVENT_STOP)|
1741                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1742                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1743                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1744                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1745                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1746                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1747                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1748                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1749                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1750                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1751                 err = -EINVAL;
1752                 goto _end;
1753         }
1754         snd_timer_stop(tu->timeri);
1755         spin_lock_irq(&t->lock);
1756         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1757                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1758                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1759         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1760                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1761         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1762                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1763         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1764                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1765         spin_unlock_irq(&t->lock);
1766         if (params.queue_size > 0 &&
1767             (unsigned int)tu->queue_size != params.queue_size) {
1768                 err = realloc_user_queue(tu, params.queue_size);
1769                 if (err < 0)
1770                         goto _end;
1771         }
1772         spin_lock_irq(&tu->qlock);
1773         tu->qhead = tu->qtail = tu->qused = 0;
1774         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1775                 if (tu->tread) {
1776                         struct snd_timer_tread tread;
1777                         memset(&tread, 0, sizeof(tread));
1778                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1779                         tread.tstamp.tv_sec = 0;
1780                         tread.tstamp.tv_nsec = 0;
1781                         tread.val = 0;
1782                         snd_timer_user_append_to_tqueue(tu, &tread);
1783                 } else {
1784                         struct snd_timer_read *r = &tu->queue[0];
1785                         r->resolution = 0;
1786                         r->ticks = 0;
1787                         tu->qused++;
1788                         tu->qtail++;
1789                 }
1790         }
1791         tu->filter = params.filter;
1792         tu->ticks = params.ticks;
1793         spin_unlock_irq(&tu->qlock);
1794         err = 0;
1795  _end:
1796         if (copy_to_user(_params, &params, sizeof(params)))
1797                 return -EFAULT;
1798         return err;
1799 }
1800
1801 static int snd_timer_user_status(struct file *file,
1802                                  struct snd_timer_status __user *_status)
1803 {
1804         struct snd_timer_user *tu;
1805         struct snd_timer_status status;
1806
1807         tu = file->private_data;
1808         if (!tu->timeri)
1809                 return -EBADFD;
1810         memset(&status, 0, sizeof(status));
1811         status.tstamp = tu->tstamp;
1812         status.resolution = snd_timer_resolution(tu->timeri);
1813         status.lost = tu->timeri->lost;
1814         status.overrun = tu->overrun;
1815         spin_lock_irq(&tu->qlock);
1816         status.queue = tu->qused;
1817         spin_unlock_irq(&tu->qlock);
1818         if (copy_to_user(_status, &status, sizeof(status)))
1819                 return -EFAULT;
1820         return 0;
1821 }
1822
1823 static int snd_timer_user_start(struct file *file)
1824 {
1825         int err;
1826         struct snd_timer_user *tu;
1827
1828         tu = file->private_data;
1829         if (!tu->timeri)
1830                 return -EBADFD;
1831         snd_timer_stop(tu->timeri);
1832         tu->timeri->lost = 0;
1833         tu->last_resolution = 0;
1834         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1835 }
1836
1837 static int snd_timer_user_stop(struct file *file)
1838 {
1839         int err;
1840         struct snd_timer_user *tu;
1841
1842         tu = file->private_data;
1843         if (!tu->timeri)
1844                 return -EBADFD;
1845         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1846 }
1847
1848 static int snd_timer_user_continue(struct file *file)
1849 {
1850         int err;
1851         struct snd_timer_user *tu;
1852
1853         tu = file->private_data;
1854         if (!tu->timeri)
1855                 return -EBADFD;
1856         /* start timer instead of continue if it's not used before */
1857         if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1858                 return snd_timer_user_start(file);
1859         tu->timeri->lost = 0;
1860         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1861 }
1862
1863 static int snd_timer_user_pause(struct file *file)
1864 {
1865         int err;
1866         struct snd_timer_user *tu;
1867
1868         tu = file->private_data;
1869         if (!tu->timeri)
1870                 return -EBADFD;
1871         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1872 }
1873
1874 enum {
1875         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1876         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1877         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1878         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1879 };
1880
1881 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1882                                  unsigned long arg)
1883 {
1884         struct snd_timer_user *tu;
1885         void __user *argp = (void __user *)arg;
1886         int __user *p = argp;
1887
1888         tu = file->private_data;
1889         switch (cmd) {
1890         case SNDRV_TIMER_IOCTL_PVERSION:
1891                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1892         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1893                 return snd_timer_user_next_device(argp);
1894         case SNDRV_TIMER_IOCTL_TREAD:
1895         {
1896                 int xarg, old_tread;
1897
1898                 if (tu->timeri) /* too late */
1899                         return -EBUSY;
1900                 if (get_user(xarg, p))
1901                         return -EFAULT;
1902                 old_tread = tu->tread;
1903                 tu->tread = xarg ? 1 : 0;
1904                 if (tu->tread != old_tread &&
1905                     realloc_user_queue(tu, tu->queue_size) < 0) {
1906                         tu->tread = old_tread;
1907                         return -ENOMEM;
1908                 }
1909                 return 0;
1910         }
1911         case SNDRV_TIMER_IOCTL_GINFO:
1912                 return snd_timer_user_ginfo(file, argp);
1913         case SNDRV_TIMER_IOCTL_GPARAMS:
1914                 return snd_timer_user_gparams(file, argp);
1915         case SNDRV_TIMER_IOCTL_GSTATUS:
1916                 return snd_timer_user_gstatus(file, argp);
1917         case SNDRV_TIMER_IOCTL_SELECT:
1918                 return snd_timer_user_tselect(file, argp);
1919         case SNDRV_TIMER_IOCTL_INFO:
1920                 return snd_timer_user_info(file, argp);
1921         case SNDRV_TIMER_IOCTL_PARAMS:
1922                 return snd_timer_user_params(file, argp);
1923         case SNDRV_TIMER_IOCTL_STATUS:
1924                 return snd_timer_user_status(file, argp);
1925         case SNDRV_TIMER_IOCTL_START:
1926         case SNDRV_TIMER_IOCTL_START_OLD:
1927                 return snd_timer_user_start(file);
1928         case SNDRV_TIMER_IOCTL_STOP:
1929         case SNDRV_TIMER_IOCTL_STOP_OLD:
1930                 return snd_timer_user_stop(file);
1931         case SNDRV_TIMER_IOCTL_CONTINUE:
1932         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1933                 return snd_timer_user_continue(file);
1934         case SNDRV_TIMER_IOCTL_PAUSE:
1935         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1936                 return snd_timer_user_pause(file);
1937         }
1938         return -ENOTTY;
1939 }
1940
1941 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1942                                  unsigned long arg)
1943 {
1944         struct snd_timer_user *tu = file->private_data;
1945         long ret;
1946
1947         mutex_lock(&tu->ioctl_lock);
1948         ret = __snd_timer_user_ioctl(file, cmd, arg);
1949         mutex_unlock(&tu->ioctl_lock);
1950         return ret;
1951 }
1952
1953 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1954 {
1955         struct snd_timer_user *tu;
1956
1957         tu = file->private_data;
1958         return fasync_helper(fd, file, on, &tu->fasync);
1959 }
1960
1961 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1962                                    size_t count, loff_t *offset)
1963 {
1964         struct snd_timer_user *tu;
1965         long result = 0, unit;
1966         int qhead;
1967         int err = 0;
1968
1969         tu = file->private_data;
1970         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1971         mutex_lock(&tu->ioctl_lock);
1972         spin_lock_irq(&tu->qlock);
1973         while ((long)count - result >= unit) {
1974                 while (!tu->qused) {
1975                         wait_queue_entry_t wait;
1976
1977                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1978                                 err = -EAGAIN;
1979                                 goto _error;
1980                         }
1981
1982                         set_current_state(TASK_INTERRUPTIBLE);
1983                         init_waitqueue_entry(&wait, current);
1984                         add_wait_queue(&tu->qchange_sleep, &wait);
1985
1986                         spin_unlock_irq(&tu->qlock);
1987                         mutex_unlock(&tu->ioctl_lock);
1988                         schedule();
1989                         mutex_lock(&tu->ioctl_lock);
1990                         spin_lock_irq(&tu->qlock);
1991
1992                         remove_wait_queue(&tu->qchange_sleep, &wait);
1993
1994                         if (tu->disconnected) {
1995                                 err = -ENODEV;
1996                                 goto _error;
1997                         }
1998                         if (signal_pending(current)) {
1999                                 err = -ERESTARTSYS;
2000                                 goto _error;
2001                         }
2002                 }
2003
2004                 qhead = tu->qhead++;
2005                 tu->qhead %= tu->queue_size;
2006                 tu->qused--;
2007                 spin_unlock_irq(&tu->qlock);
2008
2009                 if (tu->tread) {
2010                         if (copy_to_user(buffer, &tu->tqueue[qhead],
2011                                          sizeof(struct snd_timer_tread)))
2012                                 err = -EFAULT;
2013                 } else {
2014                         if (copy_to_user(buffer, &tu->queue[qhead],
2015                                          sizeof(struct snd_timer_read)))
2016                                 err = -EFAULT;
2017                 }
2018
2019                 spin_lock_irq(&tu->qlock);
2020                 if (err < 0)
2021                         goto _error;
2022                 result += unit;
2023                 buffer += unit;
2024         }
2025  _error:
2026         spin_unlock_irq(&tu->qlock);
2027         mutex_unlock(&tu->ioctl_lock);
2028         return result > 0 ? result : err;
2029 }
2030
2031 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2032 {
2033         unsigned int mask;
2034         struct snd_timer_user *tu;
2035
2036         tu = file->private_data;
2037
2038         poll_wait(file, &tu->qchange_sleep, wait);
2039
2040         mask = 0;
2041         spin_lock_irq(&tu->qlock);
2042         if (tu->qused)
2043                 mask |= POLLIN | POLLRDNORM;
2044         if (tu->disconnected)
2045                 mask |= POLLERR;
2046         spin_unlock_irq(&tu->qlock);
2047
2048         return mask;
2049 }
2050
2051 #ifdef CONFIG_COMPAT
2052 #include "timer_compat.c"
2053 #else
2054 #define snd_timer_user_ioctl_compat     NULL
2055 #endif
2056
2057 static const struct file_operations snd_timer_f_ops =
2058 {
2059         .owner =        THIS_MODULE,
2060         .read =         snd_timer_user_read,
2061         .open =         snd_timer_user_open,
2062         .release =      snd_timer_user_release,
2063         .llseek =       no_llseek,
2064         .poll =         snd_timer_user_poll,
2065         .unlocked_ioctl =       snd_timer_user_ioctl,
2066         .compat_ioctl = snd_timer_user_ioctl_compat,
2067         .fasync =       snd_timer_user_fasync,
2068 };
2069
2070 /* unregister the system timer */
2071 static void snd_timer_free_all(void)
2072 {
2073         struct snd_timer *timer, *n;
2074
2075         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2076                 snd_timer_free(timer);
2077 }
2078
2079 static struct device timer_dev;
2080
2081 /*
2082  *  ENTRY functions
2083  */
2084
2085 static int __init alsa_timer_init(void)
2086 {
2087         int err;
2088
2089         snd_device_initialize(&timer_dev, NULL);
2090         dev_set_name(&timer_dev, "timer");
2091
2092 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2093         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2094                               "system timer");
2095 #endif
2096
2097         err = snd_timer_register_system();
2098         if (err < 0) {
2099                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2100                 goto put_timer;
2101         }
2102
2103         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2104                                   &snd_timer_f_ops, NULL, &timer_dev);
2105         if (err < 0) {
2106                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2107                 snd_timer_free_all();
2108                 goto put_timer;
2109         }
2110
2111         snd_timer_proc_init();
2112         return 0;
2113
2114 put_timer:
2115         put_device(&timer_dev);
2116         return err;
2117 }
2118
2119 static void __exit alsa_timer_exit(void)
2120 {
2121         snd_unregister_device(&timer_dev);
2122         snd_timer_free_all();
2123         put_device(&timer_dev);
2124         snd_timer_proc_done();
2125 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2126         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2127 #endif
2128 }
2129
2130 module_init(alsa_timer_init)
2131 module_exit(alsa_timer_exit)