sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <linux/device.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <sound/core.h>
  31 #include <sound/timer.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/minors.h>
  35 #include <sound/initval.h>
  36 #include <linux/kmod.h>
  37
  38 /* 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         list_del_init(&timeri->ack_list);
 529         list_del_init(&timeri->active_list);
 530         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 531                                SNDRV_TIMER_IFLG_START))) {
 532                 result = -EBUSY;
 533                 goto unlock;
 534         }
 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         bool running;
 570
 571         spin_lock_irqsave(&slave_active_lock, flags);
 572         running = timeri->flags & SNDRV_TIMER_IFLG_RUNNING;
 573         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 574         if (timeri->timer) {
 575                 spin_lock(&timeri->timer->lock);
 576                 list_del_init(&timeri->ack_list);
 577                 list_del_init(&timeri->active_list);
 578                 if (running)
 579                         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 580                                           SNDRV_TIMER_EVENT_PAUSE);
 581                 spin_unlock(&timeri->timer->lock);
 582         }
 583         spin_unlock_irqrestore(&slave_active_lock, flags);
 584         return running ? 0 : -EBUSY;
 585 }
 586
 587 /*
 588  *  start the timer instance
 589  */
 590 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 591 {
 592         if (timeri == NULL || ticks < 1)
 593                 return -EINVAL;
 594         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 595                 return snd_timer_start_slave(timeri, true);
 596         else
 597                 return snd_timer_start1(timeri, true, ticks);
 598 }
 599
 600 /*
 601  * stop the timer instance.
 602  *
 603  * do not call this from the timer callback!
 604  */
 605 int snd_timer_stop(struct snd_timer_instance *timeri)
 606 {
 607         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 608                 return snd_timer_stop_slave(timeri, true);
 609         else
 610                 return snd_timer_stop1(timeri, true);
 611 }
 612
 613 /*
 614  * start again..  the tick is kept.
 615  */
 616 int snd_timer_continue(struct snd_timer_instance *timeri)
 617 {
 618         /* timer can continue only after pause */
 619         if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
 620                 return -EINVAL;
 621
 622         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 623                 return snd_timer_start_slave(timeri, false);
 624         else
 625                 return snd_timer_start1(timeri, false, 0);
 626 }
 627
 628 /*
 629  * pause.. remember the ticks left
 630  */
 631 int snd_timer_pause(struct snd_timer_instance * timeri)
 632 {
 633         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 634                 return snd_timer_stop_slave(timeri, false);
 635         else
 636                 return snd_timer_stop1(timeri, false);
 637 }
 638
 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
 820 /*
 821
 822  */
 823
 824 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 825                   struct snd_timer **rtimer)
 826 {
 827         struct snd_timer *timer;
 828         int err;
 829         static struct snd_device_ops ops = {
 830                 .dev_free = snd_timer_dev_free,
 831                 .dev_register = snd_timer_dev_register,
 832                 .dev_disconnect = snd_timer_dev_disconnect,
 833         };
 834
 835         if (snd_BUG_ON(!tid))
 836                 return -EINVAL;
 837         if (rtimer)
 838                 *rtimer = NULL;
 839         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 840         if (!timer)
 841                 return -ENOMEM;
 842         timer->tmr_class = tid->dev_class;
 843         timer->card = card;
 844         timer->tmr_device = tid->device;
 845         timer->tmr_subdevice = tid->subdevice;
 846         if (id)
 847                 strlcpy(timer->id, id, sizeof(timer->id));
 848         timer->sticks = 1;
 849         INIT_LIST_HEAD(&timer->device_list);
 850         INIT_LIST_HEAD(&timer->open_list_head);
 851         INIT_LIST_HEAD(&timer->active_list_head);
 852         INIT_LIST_HEAD(&timer->ack_list_head);
 853         INIT_LIST_HEAD(&timer->sack_list_head);
 854         spin_lock_init(&timer->lock);
 855         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 856                      (unsigned long)timer);
 857         if (card != NULL) {
 858                 timer->module = card->module;
 859                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 860                 if (err < 0) {
 861                         snd_timer_free(timer);
 862                         return err;
 863                 }
 864         }
 865         if (rtimer)
 866                 *rtimer = timer;
 867         return 0;
 868 }
 869
 870 static int snd_timer_free(struct snd_timer *timer)
 871 {
 872         if (!timer)
 873                 return 0;
 874
 875         mutex_lock(&register_mutex);
 876         if (! list_empty(&timer->open_list_head)) {
 877                 struct list_head *p, *n;
 878                 struct snd_timer_instance *ti;
 879                 pr_warn("ALSA: timer %p is busy?\n", timer);
 880                 list_for_each_safe(p, n, &timer->open_list_head) {
 881                         list_del_init(p);
 882                         ti = list_entry(p, struct snd_timer_instance, open_list);
 883                         ti->timer = NULL;
 884                 }
 885         }
 886         list_del(&timer->device_list);
 887         mutex_unlock(&register_mutex);
 888
 889         if (timer->private_free)
 890                 timer->private_free(timer);
 891         kfree(timer);
 892         return 0;
 893 }
 894
 895 static int snd_timer_dev_free(struct snd_device *device)
 896 {
 897         struct snd_timer *timer = device->device_data;
 898         return snd_timer_free(timer);
 899 }
 900
 901 static int snd_timer_dev_register(struct snd_device *dev)
 902 {
 903         struct snd_timer *timer = dev->device_data;
 904         struct snd_timer *timer1;
 905
 906         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 907                 return -ENXIO;
 908         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 909             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 910                 return -EINVAL;
 911
 912         mutex_lock(&register_mutex);
 913         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 914                 if (timer1->tmr_class > timer->tmr_class)
 915                         break;
 916                 if (timer1->tmr_class < timer->tmr_class)
 917                         continue;
 918                 if (timer1->card && timer->card) {
 919                         if (timer1->card->number > timer->card->number)
 920                                 break;
 921                         if (timer1->card->number < timer->card->number)
 922                                 continue;
 923                 }
 924                 if (timer1->tmr_device > timer->tmr_device)
 925                         break;
 926                 if (timer1->tmr_device < timer->tmr_device)
 927                         continue;
 928                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 929                         break;
 930                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 931                         continue;
 932                 /* conflicts.. */
 933                 mutex_unlock(&register_mutex);
 934                 return -EBUSY;
 935         }
 936         list_add_tail(&timer->device_list, &timer1->device_list);
 937         mutex_unlock(&register_mutex);
 938         return 0;
 939 }
 940
 941 /* just for reference in snd_timer_dev_disconnect() below */
 942 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
 943                                      int event, struct timespec *tstamp,
 944                                      unsigned long resolution);
 945
 946 static int snd_timer_dev_disconnect(struct snd_device *device)
 947 {
 948         struct snd_timer *timer = device->device_data;
 949         struct snd_timer_instance *ti;
 950
 951         mutex_lock(&register_mutex);
 952         list_del_init(&timer->device_list);
 953         /* wake up pending sleepers */
 954         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 955                 /* FIXME: better to have a ti.disconnect() op */
 956                 if (ti->ccallback == snd_timer_user_ccallback) {
 957                         struct snd_timer_user *tu = ti->callback_data;
 958
 959                         tu->disconnected = true;
 960                         wake_up(&tu->qchange_sleep);
 961                 }
 962         }
 963         mutex_unlock(&register_mutex);
 964         return 0;
 965 }
 966
 967 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 968 {
 969         unsigned long flags;
 970         unsigned long resolution = 0;
 971         struct snd_timer_instance *ti, *ts;
 972
 973         if (timer->card && timer->card->shutdown)
 974                 return;
 975         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 976                 return;
 977         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 978                        event > SNDRV_TIMER_EVENT_MRESUME))
 979                 return;
 980         spin_lock_irqsave(&timer->lock, flags);
 981         if (event == SNDRV_TIMER_EVENT_MSTART ||
 982             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 983             event == SNDRV_TIMER_EVENT_MRESUME) {
 984                 if (timer->hw.c_resolution)
 985                         resolution = timer->hw.c_resolution(timer);
 986                 else
 987                         resolution = timer->hw.resolution;
 988         }
 989         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 990                 if (ti->ccallback)
 991                         ti->ccallback(ti, event, tstamp, resolution);
 992                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 993                         if (ts->ccallback)
 994                                 ts->ccallback(ts, event, tstamp, resolution);
 995         }
 996         spin_unlock_irqrestore(&timer->lock, flags);
 997 }
 998
 999 /*
1000  * exported functions for global timers
1001  */
1002 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1003 {
1004         struct snd_timer_id tid;
1005
1006         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1007         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1008         tid.card = -1;
1009         tid.device = device;
1010         tid.subdevice = 0;
1011         return snd_timer_new(NULL, id, &tid, rtimer);
1012 }
1013
1014 int snd_timer_global_free(struct snd_timer *timer)
1015 {
1016         return snd_timer_free(timer);
1017 }
1018
1019 int snd_timer_global_register(struct snd_timer *timer)
1020 {
1021         struct snd_device dev;
1022
1023         memset(&dev, 0, sizeof(dev));
1024         dev.device_data = timer;
1025         return snd_timer_dev_register(&dev);
1026 }
1027
1028 /*
1029  *  System timer
1030  */
1031
1032 struct snd_timer_system_private {
1033         struct timer_list tlist;
1034         unsigned long last_expires;
1035         unsigned long last_jiffies;
1036         unsigned long correction;
1037 };
1038
1039 static void snd_timer_s_function(unsigned long data)
1040 {
1041         struct snd_timer *timer = (struct snd_timer *)data;
1042         struct snd_timer_system_private *priv = timer->private_data;
1043         unsigned long jiff = jiffies;
1044         if (time_after(jiff, priv->last_expires))
1045                 priv->correction += (long)jiff - (long)priv->last_expires;
1046         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1047 }
1048
1049 static int snd_timer_s_start(struct snd_timer * timer)
1050 {
1051         struct snd_timer_system_private *priv;
1052         unsigned long njiff;
1053
1054         priv = (struct snd_timer_system_private *) timer->private_data;
1055         njiff = (priv->last_jiffies = jiffies);
1056         if (priv->correction > timer->sticks - 1) {
1057                 priv->correction -= timer->sticks - 1;
1058                 njiff++;
1059         } else {
1060                 njiff += timer->sticks - priv->correction;
1061                 priv->correction = 0;
1062         }
1063         priv->last_expires = njiff;
1064         mod_timer(&priv->tlist, njiff);
1065         return 0;
1066 }
1067
1068 static int snd_timer_s_stop(struct snd_timer * timer)
1069 {
1070         struct snd_timer_system_private *priv;
1071         unsigned long jiff;
1072
1073         priv = (struct snd_timer_system_private *) timer->private_data;
1074         del_timer(&priv->tlist);
1075         jiff = jiffies;
1076         if (time_before(jiff, priv->last_expires))
1077                 timer->sticks = priv->last_expires - jiff;
1078         else
1079                 timer->sticks = 1;
1080         priv->correction = 0;
1081         return 0;
1082 }
1083
1084 static struct snd_timer_hardware snd_timer_system =
1085 {
1086         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1087         .resolution =   1000000000L / HZ,
1088         .ticks =        10000000L,
1089         .start =        snd_timer_s_start,
1090         .stop =         snd_timer_s_stop
1091 };
1092
1093 static void snd_timer_free_system(struct snd_timer *timer)
1094 {
1095         kfree(timer->private_data);
1096 }
1097
1098 static int snd_timer_register_system(void)
1099 {
1100         struct snd_timer *timer;
1101         struct snd_timer_system_private *priv;
1102         int err;
1103
1104         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1105         if (err < 0)
1106                 return err;
1107         strcpy(timer->name, "system timer");
1108         timer->hw = snd_timer_system;
1109         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1110         if (priv == NULL) {
1111                 snd_timer_free(timer);
1112                 return -ENOMEM;
1113         }
1114         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1115         timer->private_data = priv;
1116         timer->private_free = snd_timer_free_system;
1117         return snd_timer_global_register(timer);
1118 }
1119
1120 #ifdef CONFIG_SND_PROC_FS
1121 /*
1122  *  Info interface
1123  */
1124
1125 static void snd_timer_proc_read(struct snd_info_entry *entry,
1126                                 struct snd_info_buffer *buffer)
1127 {
1128         struct snd_timer *timer;
1129         struct snd_timer_instance *ti;
1130
1131         mutex_lock(&register_mutex);
1132         list_for_each_entry(timer, &snd_timer_list, device_list) {
1133                 if (timer->card && timer->card->shutdown)
1134                         continue;
1135                 switch (timer->tmr_class) {
1136                 case SNDRV_TIMER_CLASS_GLOBAL:
1137                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1138                         break;
1139                 case SNDRV_TIMER_CLASS_CARD:
1140                         snd_iprintf(buffer, "C%i-%i: ",
1141                                     timer->card->number, timer->tmr_device);
1142                         break;
1143                 case SNDRV_TIMER_CLASS_PCM:
1144                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1145                                     timer->tmr_device, timer->tmr_subdevice);
1146                         break;
1147                 default:
1148                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1149                                     timer->card ? timer->card->number : -1,
1150                                     timer->tmr_device, timer->tmr_subdevice);
1151                 }
1152                 snd_iprintf(buffer, "%s :", timer->name);
1153                 if (timer->hw.resolution)
1154                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1155                                     timer->hw.resolution / 1000,
1156                                     timer->hw.resolution % 1000,
1157                                     timer->hw.ticks);
1158                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1159                         snd_iprintf(buffer, " SLAVE");
1160                 snd_iprintf(buffer, "\n");
1161                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1162                         snd_iprintf(buffer, "  Client %s : %s\n",
1163                                     ti->owner ? ti->owner : "unknown",
1164                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1165                                                  SNDRV_TIMER_IFLG_RUNNING)
1166                                     ? "running" : "stopped");
1167         }
1168         mutex_unlock(&register_mutex);
1169 }
1170
1171 static struct snd_info_entry *snd_timer_proc_entry;
1172
1173 static void __init snd_timer_proc_init(void)
1174 {
1175         struct snd_info_entry *entry;
1176
1177         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1178         if (entry != NULL) {
1179                 entry->c.text.read = snd_timer_proc_read;
1180                 if (snd_info_register(entry) < 0) {
1181                         snd_info_free_entry(entry);
1182                         entry = NULL;
1183                 }
1184         }
1185         snd_timer_proc_entry = entry;
1186 }
1187
1188 static void __exit snd_timer_proc_done(void)
1189 {
1190         snd_info_free_entry(snd_timer_proc_entry);
1191 }
1192 #else /* !CONFIG_SND_PROC_FS */
1193 #define snd_timer_proc_init()
1194 #define snd_timer_proc_done()
1195 #endif
1196
1197 /*
1198  *  USER SPACE interface
1199  */
1200
1201 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1202                                      unsigned long resolution,
1203                                      unsigned long ticks)
1204 {
1205         struct snd_timer_user *tu = timeri->callback_data;
1206         struct snd_timer_read *r;
1207         int prev;
1208
1209         spin_lock(&tu->qlock);
1210         if (tu->qused > 0) {
1211                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1212                 r = &tu->queue[prev];
1213                 if (r->resolution == resolution) {
1214                         r->ticks += ticks;
1215                         goto __wake;
1216                 }
1217         }
1218         if (tu->qused >= tu->queue_size) {
1219                 tu->overrun++;
1220         } else {
1221                 r = &tu->queue[tu->qtail++];
1222                 tu->qtail %= tu->queue_size;
1223                 r->resolution = resolution;
1224                 r->ticks = ticks;
1225                 tu->qused++;
1226         }
1227       __wake:
1228         spin_unlock(&tu->qlock);
1229         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1230         wake_up(&tu->qchange_sleep);
1231 }
1232
1233 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1234                                             struct snd_timer_tread *tread)
1235 {
1236         if (tu->qused >= tu->queue_size) {
1237                 tu->overrun++;
1238         } else {
1239                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1240                 tu->qtail %= tu->queue_size;
1241                 tu->qused++;
1242         }
1243 }
1244
1245 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1246                                      int event,
1247                                      struct timespec *tstamp,
1248                                      unsigned long resolution)
1249 {
1250         struct snd_timer_user *tu = timeri->callback_data;
1251         struct snd_timer_tread r1;
1252         unsigned long flags;
1253
1254         if (event >= SNDRV_TIMER_EVENT_START &&
1255             event <= SNDRV_TIMER_EVENT_PAUSE)
1256                 tu->tstamp = *tstamp;
1257         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1258                 return;
1259         memset(&r1, 0, sizeof(r1));
1260         r1.event = event;
1261         r1.tstamp = *tstamp;
1262         r1.val = resolution;
1263         spin_lock_irqsave(&tu->qlock, flags);
1264         snd_timer_user_append_to_tqueue(tu, &r1);
1265         spin_unlock_irqrestore(&tu->qlock, flags);
1266         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1267         wake_up(&tu->qchange_sleep);
1268 }
1269
1270 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1271                                       unsigned long resolution,
1272                                       unsigned long ticks)
1273 {
1274         struct snd_timer_user *tu = timeri->callback_data;
1275         struct snd_timer_tread *r, r1;
1276         struct timespec tstamp;
1277         int prev, append = 0;
1278
1279         memset(&tstamp, 0, sizeof(tstamp));
1280         spin_lock(&tu->qlock);
1281         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1282                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1283                 spin_unlock(&tu->qlock);
1284                 return;
1285         }
1286         if (tu->last_resolution != resolution || ticks > 0) {
1287                 if (timer_tstamp_monotonic)
1288                         ktime_get_ts(&tstamp);
1289                 else
1290                         getnstimeofday(&tstamp);
1291         }
1292         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1293             tu->last_resolution != resolution) {
1294                 memset(&r1, 0, sizeof(r1));
1295                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1296                 r1.tstamp = tstamp;
1297                 r1.val = resolution;
1298                 snd_timer_user_append_to_tqueue(tu, &r1);
1299                 tu->last_resolution = resolution;
1300                 append++;
1301         }
1302         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1303                 goto __wake;
1304         if (ticks == 0)
1305                 goto __wake;
1306         if (tu->qused > 0) {
1307                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1308                 r = &tu->tqueue[prev];
1309                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1310                         r->tstamp = tstamp;
1311                         r->val += ticks;
1312                         append++;
1313                         goto __wake;
1314                 }
1315         }
1316         r1.event = SNDRV_TIMER_EVENT_TICK;
1317         r1.tstamp = tstamp;
1318         r1.val = ticks;
1319         snd_timer_user_append_to_tqueue(tu, &r1);
1320         append++;
1321       __wake:
1322         spin_unlock(&tu->qlock);
1323         if (append == 0)
1324                 return;
1325         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1326         wake_up(&tu->qchange_sleep);
1327 }
1328
1329 static int snd_timer_user_open(struct inode *inode, struct file *file)
1330 {
1331         struct snd_timer_user *tu;
1332         int err;
1333
1334         err = nonseekable_open(inode, file);
1335         if (err < 0)
1336                 return err;
1337
1338         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1339         if (tu == NULL)
1340                 return -ENOMEM;
1341         spin_lock_init(&tu->qlock);
1342         init_waitqueue_head(&tu->qchange_sleep);
1343         mutex_init(&tu->ioctl_lock);
1344         tu->ticks = 1;
1345         tu->queue_size = 128;
1346         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1347                             GFP_KERNEL);
1348         if (tu->queue == NULL) {
1349                 kfree(tu);
1350                 return -ENOMEM;
1351         }
1352         file->private_data = tu;
1353         return 0;
1354 }
1355
1356 static int snd_timer_user_release(struct inode *inode, struct file *file)
1357 {
1358         struct snd_timer_user *tu;
1359
1360         if (file->private_data) {
1361                 tu = file->private_data;
1362                 file->private_data = NULL;
1363                 mutex_lock(&tu->ioctl_lock);
1364                 if (tu->timeri)
1365                         snd_timer_close(tu->timeri);
1366                 mutex_unlock(&tu->ioctl_lock);
1367                 kfree(tu->queue);
1368                 kfree(tu->tqueue);
1369                 kfree(tu);
1370         }
1371         return 0;
1372 }
1373
1374 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1375 {
1376         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1377         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1378         id->card = -1;
1379         id->device = -1;
1380         id->subdevice = -1;
1381 }
1382
1383 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1384 {
1385         id->dev_class = timer->tmr_class;
1386         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1387         id->card = timer->card ? timer->card->number : -1;
1388         id->device = timer->tmr_device;
1389         id->subdevice = timer->tmr_subdevice;
1390 }
1391
1392 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1393 {
1394         struct snd_timer_id id;
1395         struct snd_timer *timer;
1396         struct list_head *p;
1397
1398         if (copy_from_user(&id, _tid, sizeof(id)))
1399                 return -EFAULT;
1400         mutex_lock(&register_mutex);
1401         if (id.dev_class < 0) {         /* first item */
1402                 if (list_empty(&snd_timer_list))
1403                         snd_timer_user_zero_id(&id);
1404                 else {
1405                         timer = list_entry(snd_timer_list.next,
1406                                            struct snd_timer, device_list);
1407                         snd_timer_user_copy_id(&id, timer);
1408                 }
1409         } else {
1410                 switch (id.dev_class) {
1411                 case SNDRV_TIMER_CLASS_GLOBAL:
1412                         id.device = id.device < 0 ? 0 : id.device + 1;
1413                         list_for_each(p, &snd_timer_list) {
1414                                 timer = list_entry(p, struct snd_timer, device_list);
1415                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1416                                         snd_timer_user_copy_id(&id, timer);
1417                                         break;
1418                                 }
1419                                 if (timer->tmr_device >= id.device) {
1420                                         snd_timer_user_copy_id(&id, timer);
1421                                         break;
1422                                 }
1423                         }
1424                         if (p == &snd_timer_list)
1425                                 snd_timer_user_zero_id(&id);
1426                         break;
1427                 case SNDRV_TIMER_CLASS_CARD:
1428                 case SNDRV_TIMER_CLASS_PCM:
1429                         if (id.card < 0) {
1430                                 id.card = 0;
1431                         } else {
1432                                 if (id.card < 0) {
1433                                         id.card = 0;
1434                                 } else {
1435                                         if (id.device < 0) {
1436                                                 id.device = 0;
1437                                         } else {
1438                                                 if (id.subdevice < 0) {
1439                                                         id.subdevice = 0;
1440                                                 } else {
1441                                                         id.subdevice++;
1442                                                 }
1443                                         }
1444                                 }
1445                         }
1446                         list_for_each(p, &snd_timer_list) {
1447                                 timer = list_entry(p, struct snd_timer, device_list);
1448                                 if (timer->tmr_class > id.dev_class) {
1449                                         snd_timer_user_copy_id(&id, timer);
1450                                         break;
1451                                 }
1452                                 if (timer->tmr_class < id.dev_class)
1453                                         continue;
1454                                 if (timer->card->number > id.card) {
1455                                         snd_timer_user_copy_id(&id, timer);
1456                                         break;
1457                                 }
1458                                 if (timer->card->number < id.card)
1459                                         continue;
1460                                 if (timer->tmr_device > id.device) {
1461                                         snd_timer_user_copy_id(&id, timer);
1462                                         break;
1463                                 }
1464                                 if (timer->tmr_device < id.device)
1465                                         continue;
1466                                 if (timer->tmr_subdevice > id.subdevice) {
1467                                         snd_timer_user_copy_id(&id, timer);
1468                                         break;
1469                                 }
1470                                 if (timer->tmr_subdevice < id.subdevice)
1471                                         continue;
1472                                 snd_timer_user_copy_id(&id, timer);
1473                                 break;
1474                         }
1475                         if (p == &snd_timer_list)
1476                                 snd_timer_user_zero_id(&id);
1477                         break;
1478                 default:
1479                         snd_timer_user_zero_id(&id);
1480                 }
1481         }
1482         mutex_unlock(&register_mutex);
1483         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1484                 return -EFAULT;
1485         return 0;
1486 }
1487
1488 static int snd_timer_user_ginfo(struct file *file,
1489                                 struct snd_timer_ginfo __user *_ginfo)
1490 {
1491         struct snd_timer_ginfo *ginfo;
1492         struct snd_timer_id tid;
1493         struct snd_timer *t;
1494         struct list_head *p;
1495         int err = 0;
1496
1497         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1498         if (IS_ERR(ginfo))
1499                 return PTR_ERR(ginfo);
1500
1501         tid = ginfo->tid;
1502         memset(ginfo, 0, sizeof(*ginfo));
1503         ginfo->tid = tid;
1504         mutex_lock(&register_mutex);
1505         t = snd_timer_find(&tid);
1506         if (t != NULL) {
1507                 ginfo->card = t->card ? t->card->number : -1;
1508                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1509                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1510                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1511                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1512                 ginfo->resolution = t->hw.resolution;
1513                 if (t->hw.resolution_min > 0) {
1514                         ginfo->resolution_min = t->hw.resolution_min;
1515                         ginfo->resolution_max = t->hw.resolution_max;
1516                 }
1517                 list_for_each(p, &t->open_list_head) {
1518                         ginfo->clients++;
1519                 }
1520         } else {
1521                 err = -ENODEV;
1522         }
1523         mutex_unlock(&register_mutex);
1524         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1525                 err = -EFAULT;
1526         kfree(ginfo);
1527         return err;
1528 }
1529
1530 static int snd_timer_user_gparams(struct file *file,
1531                                   struct snd_timer_gparams __user *_gparams)
1532 {
1533         struct snd_timer_gparams gparams;
1534         struct snd_timer *t;
1535         int err;
1536
1537         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1538                 return -EFAULT;
1539         mutex_lock(&register_mutex);
1540         t = snd_timer_find(&gparams.tid);
1541         if (!t) {
1542                 err = -ENODEV;
1543                 goto _error;
1544         }
1545         if (!list_empty(&t->open_list_head)) {
1546                 err = -EBUSY;
1547                 goto _error;
1548         }
1549         if (!t->hw.set_period) {
1550                 err = -ENOSYS;
1551                 goto _error;
1552         }
1553         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1554 _error:
1555         mutex_unlock(&register_mutex);
1556         return err;
1557 }
1558
1559 static int snd_timer_user_gstatus(struct file *file,
1560                                   struct snd_timer_gstatus __user *_gstatus)
1561 {
1562         struct snd_timer_gstatus gstatus;
1563         struct snd_timer_id tid;
1564         struct snd_timer *t;
1565         int err = 0;
1566
1567         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1568                 return -EFAULT;
1569         tid = gstatus.tid;
1570         memset(&gstatus, 0, sizeof(gstatus));
1571         gstatus.tid = tid;
1572         mutex_lock(&register_mutex);
1573         t = snd_timer_find(&tid);
1574         if (t != NULL) {
1575                 if (t->hw.c_resolution)
1576                         gstatus.resolution = t->hw.c_resolution(t);
1577                 else
1578                         gstatus.resolution = t->hw.resolution;
1579                 if (t->hw.precise_resolution) {
1580                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1581                                                  &gstatus.resolution_den);
1582                 } else {
1583                         gstatus.resolution_num = gstatus.resolution;
1584                         gstatus.resolution_den = 1000000000uL;
1585                 }
1586         } else {
1587                 err = -ENODEV;
1588         }
1589         mutex_unlock(&register_mutex);
1590         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1591                 err = -EFAULT;
1592         return err;
1593 }
1594
1595 static int snd_timer_user_tselect(struct file *file,
1596                                   struct snd_timer_select __user *_tselect)
1597 {
1598         struct snd_timer_user *tu;
1599         struct snd_timer_select tselect;
1600         char str[32];
1601         int err = 0;
1602
1603         tu = file->private_data;
1604         if (tu->timeri) {
1605                 snd_timer_close(tu->timeri);
1606                 tu->timeri = NULL;
1607         }
1608         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1609                 err = -EFAULT;
1610                 goto __err;
1611         }
1612         sprintf(str, "application %i", current->pid);
1613         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1614                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1615         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1616         if (err < 0)
1617                 goto __err;
1618
1619         tu->qhead = tu->qtail = tu->qused = 0;
1620         kfree(tu->queue);
1621         tu->queue = NULL;
1622         kfree(tu->tqueue);
1623         tu->tqueue = NULL;
1624         if (tu->tread) {
1625                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1626                                      GFP_KERNEL);
1627                 if (tu->tqueue == NULL)
1628                         err = -ENOMEM;
1629         } else {
1630                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1631                                     GFP_KERNEL);
1632                 if (tu->queue == NULL)
1633                         err = -ENOMEM;
1634         }
1635
1636         if (err < 0) {
1637                 snd_timer_close(tu->timeri);
1638                 tu->timeri = NULL;
1639         } else {
1640                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1641                 tu->timeri->callback = tu->tread
1642                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1643                 tu->timeri->ccallback = snd_timer_user_ccallback;
1644                 tu->timeri->callback_data = (void *)tu;
1645         }
1646
1647       __err:
1648         return err;
1649 }
1650
1651 static int snd_timer_user_info(struct file *file,
1652                                struct snd_timer_info __user *_info)
1653 {
1654         struct snd_timer_user *tu;
1655         struct snd_timer_info *info;
1656         struct snd_timer *t;
1657         int err = 0;
1658
1659         tu = file->private_data;
1660         if (!tu->timeri)
1661                 return -EBADFD;
1662         t = tu->timeri->timer;
1663         if (!t)
1664                 return -EBADFD;
1665
1666         info = kzalloc(sizeof(*info), GFP_KERNEL);
1667         if (! info)
1668                 return -ENOMEM;
1669         info->card = t->card ? t->card->number : -1;
1670         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1671                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1672         strlcpy(info->id, t->id, sizeof(info->id));
1673         strlcpy(info->name, t->name, sizeof(info->name));
1674         info->resolution = t->hw.resolution;
1675         if (copy_to_user(_info, info, sizeof(*_info)))
1676                 err = -EFAULT;
1677         kfree(info);
1678         return err;
1679 }
1680
1681 static int snd_timer_user_params(struct file *file,
1682                                  struct snd_timer_params __user *_params)
1683 {
1684         struct snd_timer_user *tu;
1685         struct snd_timer_params params;
1686         struct snd_timer *t;
1687         struct snd_timer_read *tr;
1688         struct snd_timer_tread *ttr;
1689         int err;
1690
1691         tu = file->private_data;
1692         if (!tu->timeri)
1693                 return -EBADFD;
1694         t = tu->timeri->timer;
1695         if (!t)
1696                 return -EBADFD;
1697         if (copy_from_user(&params, _params, sizeof(params)))
1698                 return -EFAULT;
1699         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1700                 u64 resolution;
1701
1702                 if (params.ticks < 1) {
1703                         err = -EINVAL;
1704                         goto _end;
1705                 }
1706
1707                 /* Don't allow resolution less than 1ms */
1708                 resolution = snd_timer_resolution(tu->timeri);
1709                 resolution *= params.ticks;
1710                 if (resolution < 1000000) {
1711                         err = -EINVAL;
1712                         goto _end;
1713                 }
1714         }
1715         if (params.queue_size > 0 &&
1716             (params.queue_size < 32 || params.queue_size > 1024)) {
1717                 err = -EINVAL;
1718                 goto _end;
1719         }
1720         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1721                               (1<<SNDRV_TIMER_EVENT_TICK)|
1722                               (1<<SNDRV_TIMER_EVENT_START)|
1723                               (1<<SNDRV_TIMER_EVENT_STOP)|
1724                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1725                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1726                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1727                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1728                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1729                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1730                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1731                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1732                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1733                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1734                 err = -EINVAL;
1735                 goto _end;
1736         }
1737         snd_timer_stop(tu->timeri);
1738         spin_lock_irq(&t->lock);
1739         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1740                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1741                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1742         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1743                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1744         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1745                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1746         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1747                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1748         spin_unlock_irq(&t->lock);
1749         if (params.queue_size > 0 &&
1750             (unsigned int)tu->queue_size != params.queue_size) {
1751                 if (tu->tread) {
1752                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1753                                       GFP_KERNEL);
1754                         if (ttr) {
1755                                 kfree(tu->tqueue);
1756                                 tu->queue_size = params.queue_size;
1757                                 tu->tqueue = ttr;
1758                         }
1759                 } else {
1760                         tr = kmalloc(params.queue_size * sizeof(*tr),
1761                                      GFP_KERNEL);
1762                         if (tr) {
1763                                 kfree(tu->queue);
1764                                 tu->queue_size = params.queue_size;
1765                                 tu->queue = tr;
1766                         }
1767                 }
1768         }
1769         tu->qhead = tu->qtail = tu->qused = 0;
1770         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1771                 if (tu->tread) {
1772                         struct snd_timer_tread tread;
1773                         memset(&tread, 0, sizeof(tread));
1774                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1775                         tread.tstamp.tv_sec = 0;
1776                         tread.tstamp.tv_nsec = 0;
1777                         tread.val = 0;
1778                         snd_timer_user_append_to_tqueue(tu, &tread);
1779                 } else {
1780                         struct snd_timer_read *r = &tu->queue[0];
1781                         r->resolution = 0;
1782                         r->ticks = 0;
1783                         tu->qused++;
1784                         tu->qtail++;
1785                 }
1786         }
1787         tu->filter = params.filter;
1788         tu->ticks = params.ticks;
1789         err = 0;
1790  _end:
1791         if (copy_to_user(_params, &params, sizeof(params)))
1792                 return -EFAULT;
1793         return err;
1794 }
1795
1796 static int snd_timer_user_status(struct file *file,
1797                                  struct snd_timer_status __user *_status)
1798 {
1799         struct snd_timer_user *tu;
1800         struct snd_timer_status status;
1801
1802         tu = file->private_data;
1803         if (!tu->timeri)
1804                 return -EBADFD;
1805         memset(&status, 0, sizeof(status));
1806         status.tstamp = tu->tstamp;
1807         status.resolution = snd_timer_resolution(tu->timeri);
1808         status.lost = tu->timeri->lost;
1809         status.overrun = tu->overrun;
1810         spin_lock_irq(&tu->qlock);
1811         status.queue = tu->qused;
1812         spin_unlock_irq(&tu->qlock);
1813         if (copy_to_user(_status, &status, sizeof(status)))
1814                 return -EFAULT;
1815         return 0;
1816 }
1817
1818 static int snd_timer_user_start(struct file *file)
1819 {
1820         int err;
1821         struct snd_timer_user *tu;
1822
1823         tu = file->private_data;
1824         if (!tu->timeri)
1825                 return -EBADFD;
1826         snd_timer_stop(tu->timeri);
1827         tu->timeri->lost = 0;
1828         tu->last_resolution = 0;
1829         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1830 }
1831
1832 static int snd_timer_user_stop(struct file *file)
1833 {
1834         int err;
1835         struct snd_timer_user *tu;
1836
1837         tu = file->private_data;
1838         if (!tu->timeri)
1839                 return -EBADFD;
1840         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1841 }
1842
1843 static int snd_timer_user_continue(struct file *file)
1844 {
1845         int err;
1846         struct snd_timer_user *tu;
1847
1848         tu = file->private_data;
1849         if (!tu->timeri)
1850                 return -EBADFD;
1851         /* start timer instead of continue if it's not used before */
1852         if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1853                 return snd_timer_user_start(file);
1854         tu->timeri->lost = 0;
1855         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1856 }
1857
1858 static int snd_timer_user_pause(struct file *file)
1859 {
1860         int err;
1861         struct snd_timer_user *tu;
1862
1863         tu = file->private_data;
1864         if (!tu->timeri)
1865                 return -EBADFD;
1866         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1867 }
1868
1869 enum {
1870         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1871         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1872         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1873         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1874 };
1875
1876 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1877                                  unsigned long arg)
1878 {
1879         struct snd_timer_user *tu;
1880         void __user *argp = (void __user *)arg;
1881         int __user *p = argp;
1882
1883         tu = file->private_data;
1884         switch (cmd) {
1885         case SNDRV_TIMER_IOCTL_PVERSION:
1886                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1887         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1888                 return snd_timer_user_next_device(argp);
1889         case SNDRV_TIMER_IOCTL_TREAD:
1890         {
1891                 int xarg;
1892
1893                 if (tu->timeri) /* too late */
1894                         return -EBUSY;
1895                 if (get_user(xarg, p))
1896                         return -EFAULT;
1897                 tu->tread = xarg ? 1 : 0;
1898                 return 0;
1899         }
1900         case SNDRV_TIMER_IOCTL_GINFO:
1901                 return snd_timer_user_ginfo(file, argp);
1902         case SNDRV_TIMER_IOCTL_GPARAMS:
1903                 return snd_timer_user_gparams(file, argp);
1904         case SNDRV_TIMER_IOCTL_GSTATUS:
1905                 return snd_timer_user_gstatus(file, argp);
1906         case SNDRV_TIMER_IOCTL_SELECT:
1907                 return snd_timer_user_tselect(file, argp);
1908         case SNDRV_TIMER_IOCTL_INFO:
1909                 return snd_timer_user_info(file, argp);
1910         case SNDRV_TIMER_IOCTL_PARAMS:
1911                 return snd_timer_user_params(file, argp);
1912         case SNDRV_TIMER_IOCTL_STATUS:
1913                 return snd_timer_user_status(file, argp);
1914         case SNDRV_TIMER_IOCTL_START:
1915         case SNDRV_TIMER_IOCTL_START_OLD:
1916                 return snd_timer_user_start(file);
1917         case SNDRV_TIMER_IOCTL_STOP:
1918         case SNDRV_TIMER_IOCTL_STOP_OLD:
1919                 return snd_timer_user_stop(file);
1920         case SNDRV_TIMER_IOCTL_CONTINUE:
1921         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1922                 return snd_timer_user_continue(file);
1923         case SNDRV_TIMER_IOCTL_PAUSE:
1924         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1925                 return snd_timer_user_pause(file);
1926         }
1927         return -ENOTTY;
1928 }
1929
1930 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1931                                  unsigned long arg)
1932 {
1933         struct snd_timer_user *tu = file->private_data;
1934         long ret;
1935
1936         mutex_lock(&tu->ioctl_lock);
1937         ret = __snd_timer_user_ioctl(file, cmd, arg);
1938         mutex_unlock(&tu->ioctl_lock);
1939         return ret;
1940 }
1941
1942 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1943 {
1944         struct snd_timer_user *tu;
1945
1946         tu = file->private_data;
1947         return fasync_helper(fd, file, on, &tu->fasync);
1948 }
1949
1950 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1951                                    size_t count, loff_t *offset)
1952 {
1953         struct snd_timer_user *tu;
1954         long result = 0, unit;
1955         int qhead;
1956         int err = 0;
1957
1958         tu = file->private_data;
1959         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1960         mutex_lock(&tu->ioctl_lock);
1961         spin_lock_irq(&tu->qlock);
1962         while ((long)count - result >= unit) {
1963                 while (!tu->qused) {
1964                         wait_queue_t wait;
1965
1966                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1967                                 err = -EAGAIN;
1968                                 goto _error;
1969                         }
1970
1971                         set_current_state(TASK_INTERRUPTIBLE);
1972                         init_waitqueue_entry(&wait, current);
1973                         add_wait_queue(&tu->qchange_sleep, &wait);
1974
1975                         spin_unlock_irq(&tu->qlock);
1976                         mutex_unlock(&tu->ioctl_lock);
1977                         schedule();
1978                         mutex_lock(&tu->ioctl_lock);
1979                         spin_lock_irq(&tu->qlock);
1980
1981                         remove_wait_queue(&tu->qchange_sleep, &wait);
1982
1983                         if (tu->disconnected) {
1984                                 err = -ENODEV;
1985                                 goto _error;
1986                         }
1987                         if (signal_pending(current)) {
1988                                 err = -ERESTARTSYS;
1989                                 goto _error;
1990                         }
1991                 }
1992
1993                 qhead = tu->qhead++;
1994                 tu->qhead %= tu->queue_size;
1995                 tu->qused--;
1996                 spin_unlock_irq(&tu->qlock);
1997
1998                 if (tu->tread) {
1999                         if (copy_to_user(buffer, &tu->tqueue[qhead],
2000                                          sizeof(struct snd_timer_tread)))
2001                                 err = -EFAULT;
2002                 } else {
2003                         if (copy_to_user(buffer, &tu->queue[qhead],
2004                                          sizeof(struct snd_timer_read)))
2005                                 err = -EFAULT;
2006                 }
2007
2008                 spin_lock_irq(&tu->qlock);
2009                 if (err < 0)
2010                         goto _error;
2011                 result += unit;
2012                 buffer += unit;
2013         }
2014  _error:
2015         spin_unlock_irq(&tu->qlock);
2016         mutex_unlock(&tu->ioctl_lock);
2017         return result > 0 ? result : err;
2018 }
2019
2020 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2021 {
2022         unsigned int mask;
2023         struct snd_timer_user *tu;
2024
2025         tu = file->private_data;
2026
2027         poll_wait(file, &tu->qchange_sleep, wait);
2028
2029         mask = 0;
2030         if (tu->qused)
2031                 mask |= POLLIN | POLLRDNORM;
2032         if (tu->disconnected)
2033                 mask |= POLLERR;
2034
2035         return mask;
2036 }
2037
2038 #ifdef CONFIG_COMPAT
2039 #include "timer_compat.c"
2040 #else
2041 #define snd_timer_user_ioctl_compat     NULL
2042 #endif
2043
2044 static const struct file_operations snd_timer_f_ops =
2045 {
2046         .owner =        THIS_MODULE,
2047         .read =         snd_timer_user_read,
2048         .open =         snd_timer_user_open,
2049         .release =      snd_timer_user_release,
2050         .llseek =       no_llseek,
2051         .poll =         snd_timer_user_poll,
2052         .unlocked_ioctl =       snd_timer_user_ioctl,
2053         .compat_ioctl = snd_timer_user_ioctl_compat,
2054         .fasync =       snd_timer_user_fasync,
2055 };
2056
2057 /* unregister the system timer */
2058 static void snd_timer_free_all(void)
2059 {
2060         struct snd_timer *timer, *n;
2061
2062         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2063                 snd_timer_free(timer);
2064 }
2065
2066 static struct device timer_dev;
2067
2068 /*
2069  *  ENTRY functions
2070  */
2071
2072 static int __init alsa_timer_init(void)
2073 {
2074         int err;
2075
2076         snd_device_initialize(&timer_dev, NULL);
2077         dev_set_name(&timer_dev, "timer");
2078
2079 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2080         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2081                               "system timer");
2082 #endif
2083
2084         err = snd_timer_register_system();
2085         if (err < 0) {
2086                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2087                 put_device(&timer_dev);
2088                 return err;
2089         }
2090
2091         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2092                                   &snd_timer_f_ops, NULL, &timer_dev);
2093         if (err < 0) {
2094                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2095                 snd_timer_free_all();
2096                 put_device(&timer_dev);
2097                 return err;
2098         }
2099
2100         snd_timer_proc_init();
2101         return 0;
2102 }
2103
2104 static void __exit alsa_timer_exit(void)
2105 {
2106         snd_unregister_device(&timer_dev);
2107         snd_timer_free_all();
2108         put_device(&timer_dev);
2109         snd_timer_proc_done();
2110 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2111         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2112 #endif
2113 }
2114
2115 module_init(alsa_timer_init)
2116 module_exit(alsa_timer_exit)
2117
2118 EXPORT_SYMBOL(snd_timer_open);
2119 EXPORT_SYMBOL(snd_timer_close);
2120 EXPORT_SYMBOL(snd_timer_resolution);
2121 EXPORT_SYMBOL(snd_timer_start);
2122 EXPORT_SYMBOL(snd_timer_stop);
2123 EXPORT_SYMBOL(snd_timer_continue);
2124 EXPORT_SYMBOL(snd_timer_pause);
2125 EXPORT_SYMBOL(snd_timer_new);
2126 EXPORT_SYMBOL(snd_timer_notify);
2127 EXPORT_SYMBOL(snd_timer_global_new);
2128 EXPORT_SYMBOL(snd_timer_global_free);
2129 EXPORT_SYMBOL(snd_timer_global_register);
2130 EXPORT_SYMBOL(snd_timer_interrupt);