sound/core/timer.c

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