timer.c

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