sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <linux/device.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <linux/sched/signal.h>
  31 #include <sound/core.h>
  32 #include <sound/timer.h>
  33 #include <sound/control.h>
  34 #include <sound/info.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37 #include <linux/kmod.h>
  38
  39 /* internal flags */
  40 #define SNDRV_TIMER_IFLG_PAUSED         0x00010000
  41
  42 #if IS_ENABLED(CONFIG_SND_HRTIMER)
  43 #define DEFAULT_TIMER_LIMIT 4
  44 #else
  45 #define DEFAULT_TIMER_LIMIT 1
  46 #endif
  47
  48 static int timer_limit = DEFAULT_TIMER_LIMIT;
  49 static int timer_tstamp_monotonic = 1;
  50 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  51 MODULE_DESCRIPTION("ALSA timer interface");
  52 MODULE_LICENSE("GPL");
  53 module_param(timer_limit, int, 0444);
  54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  55 module_param(timer_tstamp_monotonic, int, 0444);
  56 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  57
  58 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  59 MODULE_ALIAS("devname:snd/timer");
  60
  61 struct snd_timer_user {
  62         struct snd_timer_instance *timeri;
  63         int tread;              /* enhanced read with timestamps and events */
  64         unsigned long ticks;
  65         unsigned long overrun;
  66         int qhead;
  67         int qtail;
  68         int qused;
  69         int queue_size;
  70         bool disconnected;
  71         struct snd_timer_read *queue;
  72         struct snd_timer_tread *tqueue;
  73         spinlock_t qlock;
  74         unsigned long last_resolution;
  75         unsigned int filter;
  76         struct timespec tstamp;         /* trigger tstamp */
  77         wait_queue_head_t qchange_sleep;
  78         struct fasync_struct *fasync;
  79         struct mutex ioctl_lock;
  80 };
  81
  82 /* list of timers */
  83 static LIST_HEAD(snd_timer_list);
  84
  85 /* list of slave instances */
  86 static LIST_HEAD(snd_timer_slave_list);
  87
  88 /* lock for slave active lists */
  89 static DEFINE_SPINLOCK(slave_active_lock);
  90
  91 static DEFINE_MUTEX(register_mutex);
  92
  93 static int snd_timer_free(struct snd_timer *timer);
  94 static int snd_timer_dev_free(struct snd_device *device);
  95 static int snd_timer_dev_register(struct snd_device *device);
  96 static int snd_timer_dev_disconnect(struct snd_device *device);
  97
  98 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  99
 100 /*
 101  * create a timer instance with the given owner string.
 102  * when timer is not NULL, increments the module counter
 103  */
 104 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 105                                                          struct snd_timer *timer)
 106 {
 107         struct snd_timer_instance *timeri;
 108         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 109         if (timeri == NULL)
 110                 return NULL;
 111         timeri->owner = kstrdup(owner, GFP_KERNEL);
 112         if (! timeri->owner) {
 113                 kfree(timeri);
 114                 return NULL;
 115         }
 116         INIT_LIST_HEAD(&timeri->open_list);
 117         INIT_LIST_HEAD(&timeri->active_list);
 118         INIT_LIST_HEAD(&timeri->ack_list);
 119         INIT_LIST_HEAD(&timeri->slave_list_head);
 120         INIT_LIST_HEAD(&timeri->slave_active_head);
 121
 122         timeri->timer = timer;
 123         if (timer && !try_module_get(timer->module)) {
 124                 kfree(timeri->owner);
 125                 kfree(timeri);
 126                 return NULL;
 127         }
 128
 129         return timeri;
 130 }
 131
 132 /*
 133  * find a timer instance from the given timer id
 134  */
 135 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 136 {
 137         struct snd_timer *timer = NULL;
 138
 139         list_for_each_entry(timer, &snd_timer_list, device_list) {
 140                 if (timer->tmr_class != tid->dev_class)
 141                         continue;
 142                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 143                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 144                     (timer->card == NULL ||
 145                      timer->card->number != tid->card))
 146                         continue;
 147                 if (timer->tmr_device != tid->device)
 148                         continue;
 149                 if (timer->tmr_subdevice != tid->subdevice)
 150                         continue;
 151                 return timer;
 152         }
 153         return NULL;
 154 }
 155
 156 #ifdef CONFIG_MODULES
 157
 158 static void snd_timer_request(struct snd_timer_id *tid)
 159 {
 160         switch (tid->dev_class) {
 161         case SNDRV_TIMER_CLASS_GLOBAL:
 162                 if (tid->device < timer_limit)
 163                         request_module("snd-timer-%i", tid->device);
 164                 break;
 165         case SNDRV_TIMER_CLASS_CARD:
 166         case SNDRV_TIMER_CLASS_PCM:
 167                 if (tid->card < snd_ecards_limit)
 168                         request_module("snd-card-%i", tid->card);
 169                 break;
 170         default:
 171                 break;
 172         }
 173 }
 174
 175 #endif
 176
 177 /*
 178  * look for a master instance matching with the slave id of the given slave.
 179  * when found, relink the open_link of the slave.
 180  *
 181  * call this with register_mutex down.
 182  */
 183 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 184 {
 185         struct snd_timer *timer;
 186         struct snd_timer_instance *master;
 187
 188         /* FIXME: it's really dumb to look up all entries.. */
 189         list_for_each_entry(timer, &snd_timer_list, device_list) {
 190                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 191                         if (slave->slave_class == master->slave_class &&
 192                             slave->slave_id == master->slave_id) {
 193                                 list_move_tail(&slave->open_list,
 194                                                &master->slave_list_head);
 195                                 spin_lock_irq(&slave_active_lock);
 196                                 slave->master = master;
 197                                 slave->timer = master->timer;
 198                                 spin_unlock_irq(&slave_active_lock);
 199                                 return;
 200                         }
 201                 }
 202         }
 203 }
 204
 205 /*
 206  * look for slave instances matching with the slave id of the given master.
 207  * when found, relink the open_link of slaves.
 208  *
 209  * call this with register_mutex down.
 210  */
 211 static void snd_timer_check_master(struct snd_timer_instance *master)
 212 {
 213         struct snd_timer_instance *slave, *tmp;
 214
 215         /* check all pending slaves */
 216         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 217                 if (slave->slave_class == master->slave_class &&
 218                     slave->slave_id == master->slave_id) {
 219                         list_move_tail(&slave->open_list, &master->slave_list_head);
 220                         spin_lock_irq(&slave_active_lock);
 221                         spin_lock(&master->timer->lock);
 222                         slave->master = master;
 223                         slave->timer = master->timer;
 224                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 225                                 list_add_tail(&slave->active_list,
 226                                               &master->slave_active_head);
 227                         spin_unlock(&master->timer->lock);
 228                         spin_unlock_irq(&slave_active_lock);
 229                 }
 230         }
 231 }
 232
 233 /*
 234  * open a timer instance
 235  * when opening a master, the slave id must be here given.
 236  */
 237 int snd_timer_open(struct snd_timer_instance **ti,
 238                    char *owner, struct snd_timer_id *tid,
 239                    unsigned int slave_id)
 240 {
 241         struct snd_timer *timer;
 242         struct snd_timer_instance *timeri = NULL;
 243
 244         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 245                 /* open a slave instance */
 246                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 247                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 248                         pr_debug("ALSA: timer: invalid slave class %i\n",
 249                                  tid->dev_sclass);
 250                         return -EINVAL;
 251                 }
 252                 mutex_lock(&register_mutex);
 253                 timeri = snd_timer_instance_new(owner, NULL);
 254                 if (!timeri) {
 255                         mutex_unlock(&register_mutex);
 256                         return -ENOMEM;
 257                 }
 258                 timeri->slave_class = tid->dev_sclass;
 259                 timeri->slave_id = tid->device;
 260                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 261                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 262                 snd_timer_check_slave(timeri);
 263                 mutex_unlock(&register_mutex);
 264                 *ti = timeri;
 265                 return 0;
 266         }
 267
 268         /* open a master instance */
 269         mutex_lock(&register_mutex);
 270         timer = snd_timer_find(tid);
 271 #ifdef CONFIG_MODULES
 272         if (!timer) {
 273                 mutex_unlock(&register_mutex);
 274                 snd_timer_request(tid);
 275                 mutex_lock(&register_mutex);
 276                 timer = snd_timer_find(tid);
 277         }
 278 #endif
 279         if (!timer) {
 280                 mutex_unlock(&register_mutex);
 281                 return -ENODEV;
 282         }
 283         if (!list_empty(&timer->open_list_head)) {
 284                 timeri = list_entry(timer->open_list_head.next,
 285                                     struct snd_timer_instance, open_list);
 286                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 287                         mutex_unlock(&register_mutex);
 288                         return -EBUSY;
 289                 }
 290         }
 291         timeri = snd_timer_instance_new(owner, timer);
 292         if (!timeri) {
 293                 mutex_unlock(&register_mutex);
 294                 return -ENOMEM;
 295         }
 296         /* take a card refcount for safe disconnection */
 297         if (timer->card)
 298                 get_device(&timer->card->card_dev);
 299         timeri->slave_class = tid->dev_sclass;
 300         timeri->slave_id = slave_id;
 301
 302         if (list_empty(&timer->open_list_head) && timer->hw.open) {
 303                 int err = timer->hw.open(timer);
 304                 if (err) {
 305                         kfree(timeri->owner);
 306                         kfree(timeri);
 307
 308                         if (timer->card)
 309                                 put_device(&timer->card->card_dev);
 310                         module_put(timer->module);
 311                         mutex_unlock(&register_mutex);
 312                         return err;
 313                 }
 314         }
 315
 316         list_add_tail(&timeri->open_list, &timer->open_list_head);
 317         snd_timer_check_master(timeri);
 318         mutex_unlock(&register_mutex);
 319         *ti = timeri;
 320         return 0;
 321 }
 322
 323 /*
 324  * close a timer instance
 325  */
 326 int snd_timer_close(struct snd_timer_instance *timeri)
 327 {
 328         struct snd_timer *timer = NULL;
 329         struct snd_timer_instance *slave, *tmp;
 330
 331         if (snd_BUG_ON(!timeri))
 332                 return -ENXIO;
 333
 334         mutex_lock(&register_mutex);
 335         list_del(&timeri->open_list);
 336
 337         /* force to stop the timer */
 338         snd_timer_stop(timeri);
 339
 340         timer = timeri->timer;
 341         if (timer) {
 342                 /* wait, until the active callback is finished */
 343                 spin_lock_irq(&timer->lock);
 344                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 345                         spin_unlock_irq(&timer->lock);
 346                         udelay(10);
 347                         spin_lock_irq(&timer->lock);
 348                 }
 349                 spin_unlock_irq(&timer->lock);
 350
 351                 /* remove slave links */
 352                 spin_lock_irq(&slave_active_lock);
 353                 spin_lock(&timer->lock);
 354                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 355                                          open_list) {
 356                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 357                         slave->master = NULL;
 358                         slave->timer = NULL;
 359                         list_del_init(&slave->ack_list);
 360                         list_del_init(&slave->active_list);
 361                 }
 362                 spin_unlock(&timer->lock);
 363                 spin_unlock_irq(&slave_active_lock);
 364
 365                 /* slave doesn't need to release timer resources below */
 366                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 367                         timer = NULL;
 368         }
 369
 370         if (timeri->private_free)
 371                 timeri->private_free(timeri);
 372         kfree(timeri->owner);
 373         kfree(timeri);
 374
 375         if (timer) {
 376                 if (list_empty(&timer->open_list_head) && timer->hw.close)
 377                         timer->hw.close(timer);
 378                 /* release a card refcount for safe disconnection */
 379                 if (timer->card)
 380                         put_device(&timer->card->card_dev);
 381                 module_put(timer->module);
 382         }
 383
 384         mutex_unlock(&register_mutex);
 385         return 0;
 386 }
 387
 388 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 389 {
 390         struct snd_timer * timer;
 391
 392         if (timeri == NULL)
 393                 return 0;
 394         if ((timer = timeri->timer) != NULL) {
 395                 if (timer->hw.c_resolution)
 396                         return timer->hw.c_resolution(timer);
 397                 return timer->hw.resolution;
 398         }
 399         return 0;
 400 }
 401
 402 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 403 {
 404         struct snd_timer *timer;
 405         unsigned long resolution = 0;
 406         struct snd_timer_instance *ts;
 407         struct timespec tstamp;
 408
 409         if (timer_tstamp_monotonic)
 410                 ktime_get_ts(&tstamp);
 411         else
 412                 getnstimeofday(&tstamp);
 413         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 414                        event > SNDRV_TIMER_EVENT_PAUSE))
 415                 return;
 416         if (event == SNDRV_TIMER_EVENT_START ||
 417             event == SNDRV_TIMER_EVENT_CONTINUE)
 418                 resolution = snd_timer_resolution(ti);
 419         if (ti->ccallback)
 420                 ti->ccallback(ti, event, &tstamp, resolution);
 421         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 422                 return;
 423         timer = ti->timer;
 424         if (timer == NULL)
 425                 return;
 426         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 427                 return;
 428         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 429                 if (ts->ccallback)
 430                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 431 }
 432
 433 /* start/continue a master timer */
 434 static int snd_timer_start1(struct snd_timer_instance *timeri,
 435                             bool start, unsigned long ticks)
 436 {
 437         struct snd_timer *timer;
 438         int result;
 439         unsigned long flags;
 440
 441         timer = timeri->timer;
 442         if (!timer)
 443                 return -EINVAL;
 444
 445         spin_lock_irqsave(&timer->lock, flags);
 446         if (timer->card && timer->card->shutdown) {
 447                 result = -ENODEV;
 448                 goto unlock;
 449         }
 450         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 451                              SNDRV_TIMER_IFLG_START)) {
 452                 result = -EBUSY;
 453                 goto unlock;
 454         }
 455
 456         if (start)
 457                 timeri->ticks = timeri->cticks = ticks;
 458         else if (!timeri->cticks)
 459                 timeri->cticks = 1;
 460         timeri->pticks = 0;
 461
 462         list_move_tail(&timeri->active_list, &timer->active_list_head);
 463         if (timer->running) {
 464                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 465                         goto __start_now;
 466                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 467                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 468                 result = 1; /* delayed start */
 469         } else {
 470                 if (start)
 471                         timer->sticks = ticks;
 472                 timer->hw.start(timer);
 473               __start_now:
 474                 timer->running++;
 475                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 476                 result = 0;
 477         }
 478         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 479                           SNDRV_TIMER_EVENT_CONTINUE);
 480  unlock:
 481         spin_unlock_irqrestore(&timer->lock, flags);
 482         return result;
 483 }
 484
 485 /* start/continue a slave timer */
 486 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
 487                                  bool start)
 488 {
 489         unsigned long flags;
 490
 491         spin_lock_irqsave(&slave_active_lock, flags);
 492         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 493                 spin_unlock_irqrestore(&slave_active_lock, flags);
 494                 return -EBUSY;
 495         }
 496         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 497         if (timeri->master && timeri->timer) {
 498                 spin_lock(&timeri->timer->lock);
 499                 list_add_tail(&timeri->active_list,
 500                               &timeri->master->slave_active_head);
 501                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 502                                   SNDRV_TIMER_EVENT_CONTINUE);
 503                 spin_unlock(&timeri->timer->lock);
 504         }
 505         spin_unlock_irqrestore(&slave_active_lock, flags);
 506         return 1; /* delayed start */
 507 }
 508
 509 /* stop/pause a master timer */
 510 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
 511 {
 512         struct snd_timer *timer;
 513         int result = 0;
 514         unsigned long flags;
 515
 516         timer = timeri->timer;
 517         if (!timer)
 518                 return -EINVAL;
 519         spin_lock_irqsave(&timer->lock, flags);
 520         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 521                                SNDRV_TIMER_IFLG_START))) {
 522                 result = -EBUSY;
 523                 goto unlock;
 524         }
 525         list_del_init(&timeri->ack_list);
 526         list_del_init(&timeri->active_list);
 527         if (timer->card && timer->card->shutdown)
 528                 goto unlock;
 529         if (stop) {
 530                 timeri->cticks = timeri->ticks;
 531                 timeri->pticks = 0;
 532         }
 533         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 534             !(--timer->running)) {
 535                 timer->hw.stop(timer);
 536                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 537                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 538                         snd_timer_reschedule(timer, 0);
 539                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 540                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 541                                 timer->hw.start(timer);
 542                         }
 543                 }
 544         }
 545         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 546         if (stop)
 547                 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
 548         else
 549                 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
 550         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 551                           SNDRV_TIMER_EVENT_CONTINUE);
 552  unlock:
 553         spin_unlock_irqrestore(&timer->lock, flags);
 554         return result;
 555 }
 556
 557 /* stop/pause a slave timer */
 558 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
 559 {
 560         unsigned long flags;
 561
 562         spin_lock_irqsave(&slave_active_lock, flags);
 563         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 564                 spin_unlock_irqrestore(&slave_active_lock, flags);
 565                 return -EBUSY;
 566         }
 567         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 568         if (timeri->timer) {
 569                 spin_lock(&timeri->timer->lock);
 570                 list_del_init(&timeri->ack_list);
 571                 list_del_init(&timeri->active_list);
 572                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 573                                   SNDRV_TIMER_EVENT_CONTINUE);
 574                 spin_unlock(&timeri->timer->lock);
 575         }
 576         spin_unlock_irqrestore(&slave_active_lock, flags);
 577         return 0;
 578 }
 579
 580 /*
 581  *  start the timer instance
 582  */
 583 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 584 {
 585         if (timeri == NULL || ticks < 1)
 586                 return -EINVAL;
 587         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 588                 return snd_timer_start_slave(timeri, true);
 589         else
 590                 return snd_timer_start1(timeri, true, ticks);
 591 }
 592
 593 /*
 594  * stop the timer instance.
 595  *
 596  * do not call this from the timer callback!
 597  */
 598 int snd_timer_stop(struct snd_timer_instance *timeri)
 599 {
 600         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 601                 return snd_timer_stop_slave(timeri, true);
 602         else
 603                 return snd_timer_stop1(timeri, true);
 604 }
 605
 606 /*
 607  * start again..  the tick is kept.
 608  */
 609 int snd_timer_continue(struct snd_timer_instance *timeri)
 610 {
 611         /* timer can continue only after pause */
 612         if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
 613                 return -EINVAL;
 614
 615         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 616                 return snd_timer_start_slave(timeri, false);
 617         else
 618                 return snd_timer_start1(timeri, false, 0);
 619 }
 620
 621 /*
 622  * pause.. remember the ticks left
 623  */
 624 int snd_timer_pause(struct snd_timer_instance * timeri)
 625 {
 626         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 627                 return snd_timer_stop_slave(timeri, false);
 628         else
 629                 return snd_timer_stop1(timeri, false);
 630 }
 631
 632 /*
 633  * reschedule the timer
 634  *
 635  * start pending instances and check the scheduling ticks.
 636  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 637  */
 638 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 639 {
 640         struct snd_timer_instance *ti;
 641         unsigned long ticks = ~0UL;
 642
 643         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 644                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 645                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 646                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 647                         timer->running++;
 648                 }
 649                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 650                         if (ticks > ti->cticks)
 651                                 ticks = ti->cticks;
 652                 }
 653         }
 654         if (ticks == ~0UL) {
 655                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 656                 return;
 657         }
 658         if (ticks > timer->hw.ticks)
 659                 ticks = timer->hw.ticks;
 660         if (ticks_left != ticks)
 661                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 662         timer->sticks = ticks;
 663 }
 664
 665 /*
 666  * timer tasklet
 667  *
 668  */
 669 static void snd_timer_tasklet(unsigned long arg)
 670 {
 671         struct snd_timer *timer = (struct snd_timer *) arg;
 672         struct snd_timer_instance *ti;
 673         struct list_head *p;
 674         unsigned long resolution, ticks;
 675         unsigned long flags;
 676
 677         if (timer->card && timer->card->shutdown)
 678                 return;
 679
 680         spin_lock_irqsave(&timer->lock, flags);
 681         /* now process all callbacks */
 682         while (!list_empty(&timer->sack_list_head)) {
 683                 p = timer->sack_list_head.next;         /* get first item */
 684                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 685
 686                 /* remove from ack_list and make empty */
 687                 list_del_init(p);
 688
 689                 ticks = ti->pticks;
 690                 ti->pticks = 0;
 691                 resolution = ti->resolution;
 692
 693                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 694                 spin_unlock(&timer->lock);
 695                 if (ti->callback)
 696                         ti->callback(ti, resolution, ticks);
 697                 spin_lock(&timer->lock);
 698                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 699         }
 700         spin_unlock_irqrestore(&timer->lock, flags);
 701 }
 702
 703 /*
 704  * timer interrupt
 705  *
 706  * ticks_left is usually equal to timer->sticks.
 707  *
 708  */
 709 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 710 {
 711         struct snd_timer_instance *ti, *ts, *tmp;
 712         unsigned long resolution, ticks;
 713         struct list_head *p, *ack_list_head;
 714         unsigned long flags;
 715         int use_tasklet = 0;
 716
 717         if (timer == NULL)
 718                 return;
 719
 720         if (timer->card && timer->card->shutdown)
 721                 return;
 722
 723         spin_lock_irqsave(&timer->lock, flags);
 724
 725         /* remember the current resolution */
 726         if (timer->hw.c_resolution)
 727                 resolution = timer->hw.c_resolution(timer);
 728         else
 729                 resolution = timer->hw.resolution;
 730
 731         /* loop for all active instances
 732          * Here we cannot use list_for_each_entry because the active_list of a
 733          * processed instance is relinked to done_list_head before the callback
 734          * is called.
 735          */
 736         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 737                                  active_list) {
 738                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 739                         continue;
 740                 ti->pticks += ticks_left;
 741                 ti->resolution = resolution;
 742                 if (ti->cticks < ticks_left)
 743                         ti->cticks = 0;
 744                 else
 745                         ti->cticks -= ticks_left;
 746                 if (ti->cticks) /* not expired */
 747                         continue;
 748                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 749                         ti->cticks = ti->ticks;
 750                 } else {
 751                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 752                         --timer->running;
 753                         list_del_init(&ti->active_list);
 754                 }
 755                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 756                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 757                         ack_list_head = &timer->ack_list_head;
 758                 else
 759                         ack_list_head = &timer->sack_list_head;
 760                 if (list_empty(&ti->ack_list))
 761                         list_add_tail(&ti->ack_list, ack_list_head);
 762                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 763                         ts->pticks = ti->pticks;
 764                         ts->resolution = resolution;
 765                         if (list_empty(&ts->ack_list))
 766                                 list_add_tail(&ts->ack_list, ack_list_head);
 767                 }
 768         }
 769         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 770                 snd_timer_reschedule(timer, timer->sticks);
 771         if (timer->running) {
 772                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 773                         timer->hw.stop(timer);
 774                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 775                 }
 776                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 777                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 778                         /* restart timer */
 779                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 780                         timer->hw.start(timer);
 781                 }
 782         } else {
 783                 timer->hw.stop(timer);
 784         }
 785
 786         /* now process all fast callbacks */
 787         while (!list_empty(&timer->ack_list_head)) {
 788                 p = timer->ack_list_head.next;          /* get first item */
 789                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 790
 791                 /* remove from ack_list and make empty */
 792                 list_del_init(p);
 793
 794                 ticks = ti->pticks;
 795                 ti->pticks = 0;
 796
 797                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 798                 spin_unlock(&timer->lock);
 799                 if (ti->callback)
 800                         ti->callback(ti, resolution, ticks);
 801                 spin_lock(&timer->lock);
 802                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 803         }
 804
 805         /* do we have any slow callbacks? */
 806         use_tasklet = !list_empty(&timer->sack_list_head);
 807         spin_unlock_irqrestore(&timer->lock, flags);
 808
 809         if (use_tasklet)
 810                 tasklet_schedule(&timer->task_queue);
 811 }
 812
 813 /*
 814
 815  */
 816
 817 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 818                   struct snd_timer **rtimer)
 819 {
 820         struct snd_timer *timer;
 821         int err;
 822         static struct snd_device_ops ops = {
 823                 .dev_free = snd_timer_dev_free,
 824                 .dev_register = snd_timer_dev_register,
 825                 .dev_disconnect = snd_timer_dev_disconnect,
 826         };
 827
 828         if (snd_BUG_ON(!tid))
 829                 return -EINVAL;
 830         if (rtimer)
 831                 *rtimer = NULL;
 832         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 833         if (!timer)
 834                 return -ENOMEM;
 835         timer->tmr_class = tid->dev_class;
 836         timer->card = card;
 837         timer->tmr_device = tid->device;
 838         timer->tmr_subdevice = tid->subdevice;
 839         if (id)
 840                 strlcpy(timer->id, id, sizeof(timer->id));
 841         timer->sticks = 1;
 842         INIT_LIST_HEAD(&timer->device_list);
 843         INIT_LIST_HEAD(&timer->open_list_head);
 844         INIT_LIST_HEAD(&timer->active_list_head);
 845         INIT_LIST_HEAD(&timer->ack_list_head);
 846         INIT_LIST_HEAD(&timer->sack_list_head);
 847         spin_lock_init(&timer->lock);
 848         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 849                      (unsigned long)timer);
 850         if (card != NULL) {
 851                 timer->module = card->module;
 852                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 853                 if (err < 0) {
 854                         snd_timer_free(timer);
 855                         return err;
 856                 }
 857         }
 858         if (rtimer)
 859                 *rtimer = timer;
 860         return 0;
 861 }
 862
 863 static int snd_timer_free(struct snd_timer *timer)
 864 {
 865         if (!timer)
 866                 return 0;
 867
 868         mutex_lock(&register_mutex);
 869         if (! list_empty(&timer->open_list_head)) {
 870                 struct list_head *p, *n;
 871                 struct snd_timer_instance *ti;
 872                 pr_warn("ALSA: timer %p is busy?\n", timer);
 873                 list_for_each_safe(p, n, &timer->open_list_head) {
 874                         list_del_init(p);
 875                         ti = list_entry(p, struct snd_timer_instance, open_list);
 876                         ti->timer = NULL;
 877                 }
 878         }
 879         list_del(&timer->device_list);
 880         mutex_unlock(&register_mutex);
 881
 882         if (timer->private_free)
 883                 timer->private_free(timer);
 884         kfree(timer);
 885         return 0;
 886 }
 887
 888 static int snd_timer_dev_free(struct snd_device *device)
 889 {
 890         struct snd_timer *timer = device->device_data;
 891         return snd_timer_free(timer);
 892 }
 893
 894 static int snd_timer_dev_register(struct snd_device *dev)
 895 {
 896         struct snd_timer *timer = dev->device_data;
 897         struct snd_timer *timer1;
 898
 899         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 900                 return -ENXIO;
 901         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 902             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 903                 return -EINVAL;
 904
 905         mutex_lock(&register_mutex);
 906         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 907                 if (timer1->tmr_class > timer->tmr_class)
 908                         break;
 909                 if (timer1->tmr_class < timer->tmr_class)
 910                         continue;
 911                 if (timer1->card && timer->card) {
 912                         if (timer1->card->number > timer->card->number)
 913                                 break;
 914                         if (timer1->card->number < timer->card->number)
 915                                 continue;
 916                 }
 917                 if (timer1->tmr_device > timer->tmr_device)
 918                         break;
 919                 if (timer1->tmr_device < timer->tmr_device)
 920                         continue;
 921                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 922                         break;
 923                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 924                         continue;
 925                 /* conflicts.. */
 926                 mutex_unlock(&register_mutex);
 927                 return -EBUSY;
 928         }
 929         list_add_tail(&timer->device_list, &timer1->device_list);
 930         mutex_unlock(&register_mutex);
 931         return 0;
 932 }
 933
 934 static int snd_timer_dev_disconnect(struct snd_device *device)
 935 {
 936         struct snd_timer *timer = device->device_data;
 937         struct snd_timer_instance *ti;
 938
 939         mutex_lock(&register_mutex);
 940         list_del_init(&timer->device_list);
 941         /* wake up pending sleepers */
 942         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 943                 if (ti->disconnect)
 944                         ti->disconnect(ti);
 945         }
 946         mutex_unlock(&register_mutex);
 947         return 0;
 948 }
 949
 950 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 951 {
 952         unsigned long flags;
 953         unsigned long resolution = 0;
 954         struct snd_timer_instance *ti, *ts;
 955
 956         if (timer->card && timer->card->shutdown)
 957                 return;
 958         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 959                 return;
 960         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 961                        event > SNDRV_TIMER_EVENT_MRESUME))
 962                 return;
 963         spin_lock_irqsave(&timer->lock, flags);
 964         if (event == SNDRV_TIMER_EVENT_MSTART ||
 965             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 966             event == SNDRV_TIMER_EVENT_MRESUME) {
 967                 if (timer->hw.c_resolution)
 968                         resolution = timer->hw.c_resolution(timer);
 969                 else
 970                         resolution = timer->hw.resolution;
 971         }
 972         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 973                 if (ti->ccallback)
 974                         ti->ccallback(ti, event, tstamp, resolution);
 975                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 976                         if (ts->ccallback)
 977                                 ts->ccallback(ts, event, tstamp, resolution);
 978         }
 979         spin_unlock_irqrestore(&timer->lock, flags);
 980 }
 981
 982 /*
 983  * exported functions for global timers
 984  */
 985 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 986 {
 987         struct snd_timer_id tid;
 988
 989         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 990         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 991         tid.card = -1;
 992         tid.device = device;
 993         tid.subdevice = 0;
 994         return snd_timer_new(NULL, id, &tid, rtimer);
 995 }
 996
 997 int snd_timer_global_free(struct snd_timer *timer)
 998 {
 999         return snd_timer_free(timer);
1000 }
1001
1002 int snd_timer_global_register(struct snd_timer *timer)
1003 {
1004         struct snd_device dev;
1005
1006         memset(&dev, 0, sizeof(dev));
1007         dev.device_data = timer;
1008         return snd_timer_dev_register(&dev);
1009 }
1010
1011 /*
1012  *  System timer
1013  */
1014
1015 struct snd_timer_system_private {
1016         struct timer_list tlist;
1017         unsigned long last_expires;
1018         unsigned long last_jiffies;
1019         unsigned long correction;
1020 };
1021
1022 static void snd_timer_s_function(unsigned long data)
1023 {
1024         struct snd_timer *timer = (struct snd_timer *)data;
1025         struct snd_timer_system_private *priv = timer->private_data;
1026         unsigned long jiff = jiffies;
1027         if (time_after(jiff, priv->last_expires))
1028                 priv->correction += (long)jiff - (long)priv->last_expires;
1029         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1030 }
1031
1032 static int snd_timer_s_start(struct snd_timer * timer)
1033 {
1034         struct snd_timer_system_private *priv;
1035         unsigned long njiff;
1036
1037         priv = (struct snd_timer_system_private *) timer->private_data;
1038         njiff = (priv->last_jiffies = jiffies);
1039         if (priv->correction > timer->sticks - 1) {
1040                 priv->correction -= timer->sticks - 1;
1041                 njiff++;
1042         } else {
1043                 njiff += timer->sticks - priv->correction;
1044                 priv->correction = 0;
1045         }
1046         priv->last_expires = njiff;
1047         mod_timer(&priv->tlist, njiff);
1048         return 0;
1049 }
1050
1051 static int snd_timer_s_stop(struct snd_timer * timer)
1052 {
1053         struct snd_timer_system_private *priv;
1054         unsigned long jiff;
1055
1056         priv = (struct snd_timer_system_private *) timer->private_data;
1057         del_timer(&priv->tlist);
1058         jiff = jiffies;
1059         if (time_before(jiff, priv->last_expires))
1060                 timer->sticks = priv->last_expires - jiff;
1061         else
1062                 timer->sticks = 1;
1063         priv->correction = 0;
1064         return 0;
1065 }
1066
1067 static int snd_timer_s_close(struct snd_timer *timer)
1068 {
1069         struct snd_timer_system_private *priv;
1070
1071         priv = (struct snd_timer_system_private *)timer->private_data;
1072         del_timer_sync(&priv->tlist);
1073         return 0;
1074 }
1075
1076 static struct snd_timer_hardware snd_timer_system =
1077 {
1078         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1079         .resolution =   1000000000L / HZ,
1080         .ticks =        10000000L,
1081         .close =        snd_timer_s_close,
1082         .start =        snd_timer_s_start,
1083         .stop =         snd_timer_s_stop
1084 };
1085
1086 static void snd_timer_free_system(struct snd_timer *timer)
1087 {
1088         kfree(timer->private_data);
1089 }
1090
1091 static int snd_timer_register_system(void)
1092 {
1093         struct snd_timer *timer;
1094         struct snd_timer_system_private *priv;
1095         int err;
1096
1097         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1098         if (err < 0)
1099                 return err;
1100         strcpy(timer->name, "system timer");
1101         timer->hw = snd_timer_system;
1102         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1103         if (priv == NULL) {
1104                 snd_timer_free(timer);
1105                 return -ENOMEM;
1106         }
1107         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1108         timer->private_data = priv;
1109         timer->private_free = snd_timer_free_system;
1110         return snd_timer_global_register(timer);
1111 }
1112
1113 #ifdef CONFIG_SND_PROC_FS
1114 /*
1115  *  Info interface
1116  */
1117
1118 static void snd_timer_proc_read(struct snd_info_entry *entry,
1119                                 struct snd_info_buffer *buffer)
1120 {
1121         struct snd_timer *timer;
1122         struct snd_timer_instance *ti;
1123
1124         mutex_lock(&register_mutex);
1125         list_for_each_entry(timer, &snd_timer_list, device_list) {
1126                 if (timer->card && timer->card->shutdown)
1127                         continue;
1128                 switch (timer->tmr_class) {
1129                 case SNDRV_TIMER_CLASS_GLOBAL:
1130                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1131                         break;
1132                 case SNDRV_TIMER_CLASS_CARD:
1133                         snd_iprintf(buffer, "C%i-%i: ",
1134                                     timer->card->number, timer->tmr_device);
1135                         break;
1136                 case SNDRV_TIMER_CLASS_PCM:
1137                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1138                                     timer->tmr_device, timer->tmr_subdevice);
1139                         break;
1140                 default:
1141                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1142                                     timer->card ? timer->card->number : -1,
1143                                     timer->tmr_device, timer->tmr_subdevice);
1144                 }
1145                 snd_iprintf(buffer, "%s :", timer->name);
1146                 if (timer->hw.resolution)
1147                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1148                                     timer->hw.resolution / 1000,
1149                                     timer->hw.resolution % 1000,
1150                                     timer->hw.ticks);
1151                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1152                         snd_iprintf(buffer, " SLAVE");
1153                 snd_iprintf(buffer, "\n");
1154                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1155                         snd_iprintf(buffer, "  Client %s : %s\n",
1156                                     ti->owner ? ti->owner : "unknown",
1157                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1158                                                  SNDRV_TIMER_IFLG_RUNNING)
1159                                     ? "running" : "stopped");
1160         }
1161         mutex_unlock(&register_mutex);
1162 }
1163
1164 static struct snd_info_entry *snd_timer_proc_entry;
1165
1166 static void __init snd_timer_proc_init(void)
1167 {
1168         struct snd_info_entry *entry;
1169
1170         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1171         if (entry != NULL) {
1172                 entry->c.text.read = snd_timer_proc_read;
1173                 if (snd_info_register(entry) < 0) {
1174                         snd_info_free_entry(entry);
1175                         entry = NULL;
1176                 }
1177         }
1178         snd_timer_proc_entry = entry;
1179 }
1180
1181 static void __exit snd_timer_proc_done(void)
1182 {
1183         snd_info_free_entry(snd_timer_proc_entry);
1184 }
1185 #else /* !CONFIG_SND_PROC_FS */
1186 #define snd_timer_proc_init()
1187 #define snd_timer_proc_done()
1188 #endif
1189
1190 /*
1191  *  USER SPACE interface
1192  */
1193
1194 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1195                                      unsigned long resolution,
1196                                      unsigned long ticks)
1197 {
1198         struct snd_timer_user *tu = timeri->callback_data;
1199         struct snd_timer_read *r;
1200         int prev;
1201
1202         spin_lock(&tu->qlock);
1203         if (tu->qused > 0) {
1204                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1205                 r = &tu->queue[prev];
1206                 if (r->resolution == resolution) {
1207                         r->ticks += ticks;
1208                         goto __wake;
1209                 }
1210         }
1211         if (tu->qused >= tu->queue_size) {
1212                 tu->overrun++;
1213         } else {
1214                 r = &tu->queue[tu->qtail++];
1215                 tu->qtail %= tu->queue_size;
1216                 r->resolution = resolution;
1217                 r->ticks = ticks;
1218                 tu->qused++;
1219         }
1220       __wake:
1221         spin_unlock(&tu->qlock);
1222         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1223         wake_up(&tu->qchange_sleep);
1224 }
1225
1226 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1227                                             struct snd_timer_tread *tread)
1228 {
1229         if (tu->qused >= tu->queue_size) {
1230                 tu->overrun++;
1231         } else {
1232                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1233                 tu->qtail %= tu->queue_size;
1234                 tu->qused++;
1235         }
1236 }
1237
1238 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1239                                      int event,
1240                                      struct timespec *tstamp,
1241                                      unsigned long resolution)
1242 {
1243         struct snd_timer_user *tu = timeri->callback_data;
1244         struct snd_timer_tread r1;
1245         unsigned long flags;
1246
1247         if (event >= SNDRV_TIMER_EVENT_START &&
1248             event <= SNDRV_TIMER_EVENT_PAUSE)
1249                 tu->tstamp = *tstamp;
1250         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1251                 return;
1252         memset(&r1, 0, sizeof(r1));
1253         r1.event = event;
1254         r1.tstamp = *tstamp;
1255         r1.val = resolution;
1256         spin_lock_irqsave(&tu->qlock, flags);
1257         snd_timer_user_append_to_tqueue(tu, &r1);
1258         spin_unlock_irqrestore(&tu->qlock, flags);
1259         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1260         wake_up(&tu->qchange_sleep);
1261 }
1262
1263 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1264 {
1265         struct snd_timer_user *tu = timeri->callback_data;
1266
1267         tu->disconnected = true;
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(&r1, 0, sizeof(r1));
1281         memset(&tstamp, 0, sizeof(tstamp));
1282         spin_lock(&tu->qlock);
1283         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1284                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1285                 spin_unlock(&tu->qlock);
1286                 return;
1287         }
1288         if (tu->last_resolution != resolution || ticks > 0) {
1289                 if (timer_tstamp_monotonic)
1290                         ktime_get_ts(&tstamp);
1291                 else
1292                         getnstimeofday(&tstamp);
1293         }
1294         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1295             tu->last_resolution != resolution) {
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.device < 0) {
1434                                         id.device = 0;
1435                                 } else {
1436                                         if (id.subdevice < 0)
1437                                                 id.subdevice = 0;
1438                                         else
1439                                                 id.subdevice++;
1440                                 }
1441                         }
1442                         list_for_each(p, &snd_timer_list) {
1443                                 timer = list_entry(p, struct snd_timer, device_list);
1444                                 if (timer->tmr_class > id.dev_class) {
1445                                         snd_timer_user_copy_id(&id, timer);
1446                                         break;
1447                                 }
1448                                 if (timer->tmr_class < id.dev_class)
1449                                         continue;
1450                                 if (timer->card->number > id.card) {
1451                                         snd_timer_user_copy_id(&id, timer);
1452                                         break;
1453                                 }
1454                                 if (timer->card->number < id.card)
1455                                         continue;
1456                                 if (timer->tmr_device > id.device) {
1457                                         snd_timer_user_copy_id(&id, timer);
1458                                         break;
1459                                 }
1460                                 if (timer->tmr_device < id.device)
1461                                         continue;
1462                                 if (timer->tmr_subdevice > id.subdevice) {
1463                                         snd_timer_user_copy_id(&id, timer);
1464                                         break;
1465                                 }
1466                                 if (timer->tmr_subdevice < id.subdevice)
1467                                         continue;
1468                                 snd_timer_user_copy_id(&id, timer);
1469                                 break;
1470                         }
1471                         if (p == &snd_timer_list)
1472                                 snd_timer_user_zero_id(&id);
1473                         break;
1474                 default:
1475                         snd_timer_user_zero_id(&id);
1476                 }
1477         }
1478         mutex_unlock(&register_mutex);
1479         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1480                 return -EFAULT;
1481         return 0;
1482 }
1483
1484 static int snd_timer_user_ginfo(struct file *file,
1485                                 struct snd_timer_ginfo __user *_ginfo)
1486 {
1487         struct snd_timer_ginfo *ginfo;
1488         struct snd_timer_id tid;
1489         struct snd_timer *t;
1490         struct list_head *p;
1491         int err = 0;
1492
1493         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1494         if (IS_ERR(ginfo))
1495                 return PTR_ERR(ginfo);
1496
1497         tid = ginfo->tid;
1498         memset(ginfo, 0, sizeof(*ginfo));
1499         ginfo->tid = tid;
1500         mutex_lock(&register_mutex);
1501         t = snd_timer_find(&tid);
1502         if (t != NULL) {
1503                 ginfo->card = t->card ? t->card->number : -1;
1504                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1505                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1506                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1507                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1508                 ginfo->resolution = t->hw.resolution;
1509                 if (t->hw.resolution_min > 0) {
1510                         ginfo->resolution_min = t->hw.resolution_min;
1511                         ginfo->resolution_max = t->hw.resolution_max;
1512                 }
1513                 list_for_each(p, &t->open_list_head) {
1514                         ginfo->clients++;
1515                 }
1516         } else {
1517                 err = -ENODEV;
1518         }
1519         mutex_unlock(&register_mutex);
1520         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1521                 err = -EFAULT;
1522         kfree(ginfo);
1523         return err;
1524 }
1525
1526 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1527 {
1528         struct snd_timer *t;
1529         int err;
1530
1531         mutex_lock(&register_mutex);
1532         t = snd_timer_find(&gparams->tid);
1533         if (!t) {
1534                 err = -ENODEV;
1535                 goto _error;
1536         }
1537         if (!list_empty(&t->open_list_head)) {
1538                 err = -EBUSY;
1539                 goto _error;
1540         }
1541         if (!t->hw.set_period) {
1542                 err = -ENOSYS;
1543                 goto _error;
1544         }
1545         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1546 _error:
1547         mutex_unlock(&register_mutex);
1548         return err;
1549 }
1550
1551 static int snd_timer_user_gparams(struct file *file,
1552                                   struct snd_timer_gparams __user *_gparams)
1553 {
1554         struct snd_timer_gparams gparams;
1555
1556         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1557                 return -EFAULT;
1558         return timer_set_gparams(&gparams);
1559 }
1560
1561 static int snd_timer_user_gstatus(struct file *file,
1562                                   struct snd_timer_gstatus __user *_gstatus)
1563 {
1564         struct snd_timer_gstatus gstatus;
1565         struct snd_timer_id tid;
1566         struct snd_timer *t;
1567         int err = 0;
1568
1569         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1570                 return -EFAULT;
1571         tid = gstatus.tid;
1572         memset(&gstatus, 0, sizeof(gstatus));
1573         gstatus.tid = tid;
1574         mutex_lock(&register_mutex);
1575         t = snd_timer_find(&tid);
1576         if (t != NULL) {
1577                 if (t->hw.c_resolution)
1578                         gstatus.resolution = t->hw.c_resolution(t);
1579                 else
1580                         gstatus.resolution = t->hw.resolution;
1581                 if (t->hw.precise_resolution) {
1582                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1583                                                  &gstatus.resolution_den);
1584                 } else {
1585                         gstatus.resolution_num = gstatus.resolution;
1586                         gstatus.resolution_den = 1000000000uL;
1587                 }
1588         } else {
1589                 err = -ENODEV;
1590         }
1591         mutex_unlock(&register_mutex);
1592         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1593                 err = -EFAULT;
1594         return err;
1595 }
1596
1597 static int snd_timer_user_tselect(struct file *file,
1598                                   struct snd_timer_select __user *_tselect)
1599 {
1600         struct snd_timer_user *tu;
1601         struct snd_timer_select tselect;
1602         char str[32];
1603         int err = 0;
1604
1605         tu = file->private_data;
1606         if (tu->timeri) {
1607                 snd_timer_close(tu->timeri);
1608                 tu->timeri = NULL;
1609         }
1610         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1611                 err = -EFAULT;
1612                 goto __err;
1613         }
1614         sprintf(str, "application %i", current->pid);
1615         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1616                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1617         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1618         if (err < 0)
1619                 goto __err;
1620
1621         tu->qhead = tu->qtail = tu->qused = 0;
1622         kfree(tu->queue);
1623         tu->queue = NULL;
1624         kfree(tu->tqueue);
1625         tu->tqueue = NULL;
1626         if (tu->tread) {
1627                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1628                                      GFP_KERNEL);
1629                 if (tu->tqueue == NULL)
1630                         err = -ENOMEM;
1631         } else {
1632                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1633                                     GFP_KERNEL);
1634                 if (tu->queue == NULL)
1635                         err = -ENOMEM;
1636         }
1637
1638         if (err < 0) {
1639                 snd_timer_close(tu->timeri);
1640                 tu->timeri = NULL;
1641         } else {
1642                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1643                 tu->timeri->callback = tu->tread
1644                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1645                 tu->timeri->ccallback = snd_timer_user_ccallback;
1646                 tu->timeri->callback_data = (void *)tu;
1647                 tu->timeri->disconnect = snd_timer_user_disconnect;
1648         }
1649
1650       __err:
1651         return err;
1652 }
1653
1654 static int snd_timer_user_info(struct file *file,
1655                                struct snd_timer_info __user *_info)
1656 {
1657         struct snd_timer_user *tu;
1658         struct snd_timer_info *info;
1659         struct snd_timer *t;
1660         int err = 0;
1661
1662         tu = file->private_data;
1663         if (!tu->timeri)
1664                 return -EBADFD;
1665         t = tu->timeri->timer;
1666         if (!t)
1667                 return -EBADFD;
1668
1669         info = kzalloc(sizeof(*info), GFP_KERNEL);
1670         if (! info)
1671                 return -ENOMEM;
1672         info->card = t->card ? t->card->number : -1;
1673         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1674                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1675         strlcpy(info->id, t->id, sizeof(info->id));
1676         strlcpy(info->name, t->name, sizeof(info->name));
1677         info->resolution = t->hw.resolution;
1678         if (copy_to_user(_info, info, sizeof(*_info)))
1679                 err = -EFAULT;
1680         kfree(info);
1681         return err;
1682 }
1683
1684 static int snd_timer_user_params(struct file *file,
1685                                  struct snd_timer_params __user *_params)
1686 {
1687         struct snd_timer_user *tu;
1688         struct snd_timer_params params;
1689         struct snd_timer *t;
1690         struct snd_timer_read *tr;
1691         struct snd_timer_tread *ttr;
1692         int err;
1693
1694         tu = file->private_data;
1695         if (!tu->timeri)
1696                 return -EBADFD;
1697         t = tu->timeri->timer;
1698         if (!t)
1699                 return -EBADFD;
1700         if (copy_from_user(&params, _params, sizeof(params)))
1701                 return -EFAULT;
1702         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1703                 u64 resolution;
1704
1705                 if (params.ticks < 1) {
1706                         err = -EINVAL;
1707                         goto _end;
1708                 }
1709
1710                 /* Don't allow resolution less than 1ms */
1711                 resolution = snd_timer_resolution(tu->timeri);
1712                 resolution *= params.ticks;
1713                 if (resolution < 1000000) {
1714                         err = -EINVAL;
1715                         goto _end;
1716                 }
1717         }
1718         if (params.queue_size > 0 &&
1719             (params.queue_size < 32 || params.queue_size > 1024)) {
1720                 err = -EINVAL;
1721                 goto _end;
1722         }
1723         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1724                               (1<<SNDRV_TIMER_EVENT_TICK)|
1725                               (1<<SNDRV_TIMER_EVENT_START)|
1726                               (1<<SNDRV_TIMER_EVENT_STOP)|
1727                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1728                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1729                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1730                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1731                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1732                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1733                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1734                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1735                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1736                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1737                 err = -EINVAL;
1738                 goto _end;
1739         }
1740         snd_timer_stop(tu->timeri);
1741         spin_lock_irq(&t->lock);
1742         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1743                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1744                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1745         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1746                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1747         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1748                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1749         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1750                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1751         spin_unlock_irq(&t->lock);
1752         if (params.queue_size > 0 &&
1753             (unsigned int)tu->queue_size != params.queue_size) {
1754                 if (tu->tread) {
1755                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1756                                       GFP_KERNEL);
1757                         if (ttr) {
1758                                 kfree(tu->tqueue);
1759                                 tu->queue_size = params.queue_size;
1760                                 tu->tqueue = ttr;
1761                         }
1762                 } else {
1763                         tr = kmalloc(params.queue_size * sizeof(*tr),
1764                                      GFP_KERNEL);
1765                         if (tr) {
1766                                 kfree(tu->queue);
1767                                 tu->queue_size = params.queue_size;
1768                                 tu->queue = tr;
1769                         }
1770                 }
1771         }
1772         tu->qhead = tu->qtail = tu->qused = 0;
1773         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1774                 if (tu->tread) {
1775                         struct snd_timer_tread tread;
1776                         memset(&tread, 0, sizeof(tread));
1777                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1778                         tread.tstamp.tv_sec = 0;
1779                         tread.tstamp.tv_nsec = 0;
1780                         tread.val = 0;
1781                         snd_timer_user_append_to_tqueue(tu, &tread);
1782                 } else {
1783                         struct snd_timer_read *r = &tu->queue[0];
1784                         r->resolution = 0;
1785                         r->ticks = 0;
1786                         tu->qused++;
1787                         tu->qtail++;
1788                 }
1789         }
1790         tu->filter = params.filter;
1791         tu->ticks = params.ticks;
1792         err = 0;
1793  _end:
1794         if (copy_to_user(_params, &params, sizeof(params)))
1795                 return -EFAULT;
1796         return err;
1797 }
1798
1799 static int snd_timer_user_status(struct file *file,
1800                                  struct snd_timer_status __user *_status)
1801 {
1802         struct snd_timer_user *tu;
1803         struct snd_timer_status status;
1804
1805         tu = file->private_data;
1806         if (!tu->timeri)
1807                 return -EBADFD;
1808         memset(&status, 0, sizeof(status));
1809         status.tstamp = tu->tstamp;
1810         status.resolution = snd_timer_resolution(tu->timeri);
1811         status.lost = tu->timeri->lost;
1812         status.overrun = tu->overrun;
1813         spin_lock_irq(&tu->qlock);
1814         status.queue = tu->qused;
1815         spin_unlock_irq(&tu->qlock);
1816         if (copy_to_user(_status, &status, sizeof(status)))
1817                 return -EFAULT;
1818         return 0;
1819 }
1820
1821 static int snd_timer_user_start(struct file *file)
1822 {
1823         int err;
1824         struct snd_timer_user *tu;
1825
1826         tu = file->private_data;
1827         if (!tu->timeri)
1828                 return -EBADFD;
1829         snd_timer_stop(tu->timeri);
1830         tu->timeri->lost = 0;
1831         tu->last_resolution = 0;
1832         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1833 }
1834
1835 static int snd_timer_user_stop(struct file *file)
1836 {
1837         int err;
1838         struct snd_timer_user *tu;
1839
1840         tu = file->private_data;
1841         if (!tu->timeri)
1842                 return -EBADFD;
1843         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1844 }
1845
1846 static int snd_timer_user_continue(struct file *file)
1847 {
1848         int err;
1849         struct snd_timer_user *tu;
1850
1851         tu = file->private_data;
1852         if (!tu->timeri)
1853                 return -EBADFD;
1854         /* start timer instead of continue if it's not used before */
1855         if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1856                 return snd_timer_user_start(file);
1857         tu->timeri->lost = 0;
1858         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1859 }
1860
1861 static int snd_timer_user_pause(struct file *file)
1862 {
1863         int err;
1864         struct snd_timer_user *tu;
1865
1866         tu = file->private_data;
1867         if (!tu->timeri)
1868                 return -EBADFD;
1869         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1870 }
1871
1872 enum {
1873         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1874         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1875         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1876         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1877 };
1878
1879 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1880                                  unsigned long arg)
1881 {
1882         struct snd_timer_user *tu;
1883         void __user *argp = (void __user *)arg;
1884         int __user *p = argp;
1885
1886         tu = file->private_data;
1887         switch (cmd) {
1888         case SNDRV_TIMER_IOCTL_PVERSION:
1889                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1890         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1891                 return snd_timer_user_next_device(argp);
1892         case SNDRV_TIMER_IOCTL_TREAD:
1893         {
1894                 int xarg;
1895
1896                 if (tu->timeri) /* too late */
1897                         return -EBUSY;
1898                 if (get_user(xarg, p))
1899                         return -EFAULT;
1900                 tu->tread = xarg ? 1 : 0;
1901                 return 0;
1902         }
1903         case SNDRV_TIMER_IOCTL_GINFO:
1904                 return snd_timer_user_ginfo(file, argp);
1905         case SNDRV_TIMER_IOCTL_GPARAMS:
1906                 return snd_timer_user_gparams(file, argp);
1907         case SNDRV_TIMER_IOCTL_GSTATUS:
1908                 return snd_timer_user_gstatus(file, argp);
1909         case SNDRV_TIMER_IOCTL_SELECT:
1910                 return snd_timer_user_tselect(file, argp);
1911         case SNDRV_TIMER_IOCTL_INFO:
1912                 return snd_timer_user_info(file, argp);
1913         case SNDRV_TIMER_IOCTL_PARAMS:
1914                 return snd_timer_user_params(file, argp);
1915         case SNDRV_TIMER_IOCTL_STATUS:
1916                 return snd_timer_user_status(file, argp);
1917         case SNDRV_TIMER_IOCTL_START:
1918         case SNDRV_TIMER_IOCTL_START_OLD:
1919                 return snd_timer_user_start(file);
1920         case SNDRV_TIMER_IOCTL_STOP:
1921         case SNDRV_TIMER_IOCTL_STOP_OLD:
1922                 return snd_timer_user_stop(file);
1923         case SNDRV_TIMER_IOCTL_CONTINUE:
1924         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1925                 return snd_timer_user_continue(file);
1926         case SNDRV_TIMER_IOCTL_PAUSE:
1927         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1928                 return snd_timer_user_pause(file);
1929         }
1930         return -ENOTTY;
1931 }
1932
1933 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1934                                  unsigned long arg)
1935 {
1936         struct snd_timer_user *tu = file->private_data;
1937         long ret;
1938
1939         mutex_lock(&tu->ioctl_lock);
1940         ret = __snd_timer_user_ioctl(file, cmd, arg);
1941         mutex_unlock(&tu->ioctl_lock);
1942         return ret;
1943 }
1944
1945 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1946 {
1947         struct snd_timer_user *tu;
1948
1949         tu = file->private_data;
1950         return fasync_helper(fd, file, on, &tu->fasync);
1951 }
1952
1953 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1954                                    size_t count, loff_t *offset)
1955 {
1956         struct snd_timer_user *tu;
1957         long result = 0, unit;
1958         int qhead;
1959         int err = 0;
1960
1961         tu = file->private_data;
1962         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1963         mutex_lock(&tu->ioctl_lock);
1964         spin_lock_irq(&tu->qlock);
1965         while ((long)count - result >= unit) {
1966                 while (!tu->qused) {
1967                         wait_queue_t wait;
1968
1969                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1970                                 err = -EAGAIN;
1971                                 goto _error;
1972                         }
1973
1974                         set_current_state(TASK_INTERRUPTIBLE);
1975                         init_waitqueue_entry(&wait, current);
1976                         add_wait_queue(&tu->qchange_sleep, &wait);
1977
1978                         spin_unlock_irq(&tu->qlock);
1979                         mutex_unlock(&tu->ioctl_lock);
1980                         schedule();
1981                         mutex_lock(&tu->ioctl_lock);
1982                         spin_lock_irq(&tu->qlock);
1983
1984                         remove_wait_queue(&tu->qchange_sleep, &wait);
1985
1986                         if (tu->disconnected) {
1987                                 err = -ENODEV;
1988                                 goto _error;
1989                         }
1990                         if (signal_pending(current)) {
1991                                 err = -ERESTARTSYS;
1992                                 goto _error;
1993                         }
1994                 }
1995
1996                 qhead = tu->qhead++;
1997                 tu->qhead %= tu->queue_size;
1998                 tu->qused--;
1999                 spin_unlock_irq(&tu->qlock);
2000
2001                 if (tu->tread) {
2002                         if (copy_to_user(buffer, &tu->tqueue[qhead],
2003                                          sizeof(struct snd_timer_tread)))
2004                                 err = -EFAULT;
2005                 } else {
2006                         if (copy_to_user(buffer, &tu->queue[qhead],
2007                                          sizeof(struct snd_timer_read)))
2008                                 err = -EFAULT;
2009                 }
2010
2011                 spin_lock_irq(&tu->qlock);
2012                 if (err < 0)
2013                         goto _error;
2014                 result += unit;
2015                 buffer += unit;
2016         }
2017  _error:
2018         spin_unlock_irq(&tu->qlock);
2019         mutex_unlock(&tu->ioctl_lock);
2020         return result > 0 ? result : err;
2021 }
2022
2023 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2024 {
2025         unsigned int mask;
2026         struct snd_timer_user *tu;
2027
2028         tu = file->private_data;
2029
2030         poll_wait(file, &tu->qchange_sleep, wait);
2031
2032         mask = 0;
2033         if (tu->qused)
2034                 mask |= POLLIN | POLLRDNORM;
2035         if (tu->disconnected)
2036                 mask |= POLLERR;
2037
2038         return mask;
2039 }
2040
2041 #ifdef CONFIG_COMPAT
2042 #include "timer_compat.c"
2043 #else
2044 #define snd_timer_user_ioctl_compat     NULL
2045 #endif
2046
2047 static const struct file_operations snd_timer_f_ops =
2048 {
2049         .owner =        THIS_MODULE,
2050         .read =         snd_timer_user_read,
2051         .open =         snd_timer_user_open,
2052         .release =      snd_timer_user_release,
2053         .llseek =       no_llseek,
2054         .poll =         snd_timer_user_poll,
2055         .unlocked_ioctl =       snd_timer_user_ioctl,
2056         .compat_ioctl = snd_timer_user_ioctl_compat,
2057         .fasync =       snd_timer_user_fasync,
2058 };
2059
2060 /* unregister the system timer */
2061 static void snd_timer_free_all(void)
2062 {
2063         struct snd_timer *timer, *n;
2064
2065         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2066                 snd_timer_free(timer);
2067 }
2068
2069 static struct device timer_dev;
2070
2071 /*
2072  *  ENTRY functions
2073  */
2074
2075 static int __init alsa_timer_init(void)
2076 {
2077         int err;
2078
2079         snd_device_initialize(&timer_dev, NULL);
2080         dev_set_name(&timer_dev, "timer");
2081
2082 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2083         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2084                               "system timer");
2085 #endif
2086
2087         err = snd_timer_register_system();
2088         if (err < 0) {
2089                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2090                 put_device(&timer_dev);
2091                 return err;
2092         }
2093
2094         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2095                                   &snd_timer_f_ops, NULL, &timer_dev);
2096         if (err < 0) {
2097                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2098                 snd_timer_free_all();
2099                 put_device(&timer_dev);
2100                 return err;
2101         }
2102
2103         snd_timer_proc_init();
2104         return 0;
2105 }
2106
2107 static void __exit alsa_timer_exit(void)
2108 {
2109         snd_unregister_device(&timer_dev);
2110         snd_timer_free_all();
2111         put_device(&timer_dev);
2112         snd_timer_proc_done();
2113 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2114         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2115 #endif
2116 }
2117
2118 module_init(alsa_timer_init)
2119 module_exit(alsa_timer_exit)
2120
2121 EXPORT_SYMBOL(snd_timer_open);
2122 EXPORT_SYMBOL(snd_timer_close);
2123 EXPORT_SYMBOL(snd_timer_resolution);
2124 EXPORT_SYMBOL(snd_timer_start);
2125 EXPORT_SYMBOL(snd_timer_stop);
2126 EXPORT_SYMBOL(snd_timer_continue);
2127 EXPORT_SYMBOL(snd_timer_pause);
2128 EXPORT_SYMBOL(snd_timer_new);
2129 EXPORT_SYMBOL(snd_timer_notify);
2130 EXPORT_SYMBOL(snd_timer_global_new);
2131 EXPORT_SYMBOL(snd_timer_global_free);
2132 EXPORT_SYMBOL(snd_timer_global_register);
2133 EXPORT_SYMBOL(snd_timer_interrupt);