sound/core/timer.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Timers abstract layer
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/init.h>
   9 #include <linux/slab.h>
  10 #include <linux/time.h>
  11 #include <linux/mutex.h>
  12 #include <linux/device.h>
  13 #include <linux/module.h>
  14 #include <linux/string.h>
  15 #include <linux/sched/signal.h>
  16 #include <sound/core.h>
  17 #include <sound/timer.h>
  18 #include <sound/control.h>
  19 #include <sound/info.h>
  20 #include <sound/minors.h>
  21 #include <sound/initval.h>
  22 #include <linux/kmod.h>
  23
  24 /* internal flags */
  25 #define SNDRV_TIMER_IFLG_PAUSED         0x00010000
  26 #define SNDRV_TIMER_IFLG_DEAD           0x00020000
  27
  28 #if IS_ENABLED(CONFIG_SND_HRTIMER)
  29 #define DEFAULT_TIMER_LIMIT 4
  30 #else
  31 #define DEFAULT_TIMER_LIMIT 1
  32 #endif
  33
  34 static int timer_limit = DEFAULT_TIMER_LIMIT;
  35 static int timer_tstamp_monotonic = 1;
  36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  37 MODULE_DESCRIPTION("ALSA timer interface");
  38 MODULE_LICENSE("GPL");
  39 module_param(timer_limit, int, 0444);
  40 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  41 module_param(timer_tstamp_monotonic, int, 0444);
  42 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  43
  44 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  45 MODULE_ALIAS("devname:snd/timer");
  46
  47 struct snd_timer_user {
  48         struct snd_timer_instance *timeri;
  49         int tread;              /* enhanced read with timestamps and events */
  50         unsigned long ticks;
  51         unsigned long overrun;
  52         int qhead;
  53         int qtail;
  54         int qused;
  55         int queue_size;
  56         bool disconnected;
  57         struct snd_timer_read *queue;
  58         struct snd_timer_tread *tqueue;
  59         spinlock_t qlock;
  60         unsigned long last_resolution;
  61         unsigned int filter;
  62         struct timespec tstamp;         /* trigger tstamp */
  63         wait_queue_head_t qchange_sleep;
  64         struct fasync_struct *fasync;
  65         struct mutex ioctl_lock;
  66 };
  67
  68 /* list of timers */
  69 static LIST_HEAD(snd_timer_list);
  70
  71 /* list of slave instances */
  72 static LIST_HEAD(snd_timer_slave_list);
  73
  74 /* lock for slave active lists */
  75 static DEFINE_SPINLOCK(slave_active_lock);
  76
  77 #define MAX_SLAVE_INSTANCES     1000
  78 static int num_slaves;
  79
  80 static DEFINE_MUTEX(register_mutex);
  81
  82 static int snd_timer_free(struct snd_timer *timer);
  83 static int snd_timer_dev_free(struct snd_device *device);
  84 static int snd_timer_dev_register(struct snd_device *device);
  85 static int snd_timer_dev_disconnect(struct snd_device *device);
  86
  87 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  88
  89 /*
  90  * create a timer instance with the given owner string.
  91  */
  92 struct snd_timer_instance *snd_timer_instance_new(const char *owner)
  93 {
  94         struct snd_timer_instance *timeri;
  95
  96         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
  97         if (timeri == NULL)
  98                 return NULL;
  99         timeri->owner = kstrdup(owner, GFP_KERNEL);
 100         if (! timeri->owner) {
 101                 kfree(timeri);
 102                 return NULL;
 103         }
 104         INIT_LIST_HEAD(&timeri->open_list);
 105         INIT_LIST_HEAD(&timeri->active_list);
 106         INIT_LIST_HEAD(&timeri->ack_list);
 107         INIT_LIST_HEAD(&timeri->slave_list_head);
 108         INIT_LIST_HEAD(&timeri->slave_active_head);
 109
 110         return timeri;
 111 }
 112 EXPORT_SYMBOL(snd_timer_instance_new);
 113
 114 void snd_timer_instance_free(struct snd_timer_instance *timeri)
 115 {
 116         if (timeri) {
 117                 if (timeri->private_free)
 118                         timeri->private_free(timeri);
 119                 kfree(timeri->owner);
 120                 kfree(timeri);
 121         }
 122 }
 123 EXPORT_SYMBOL(snd_timer_instance_free);
 124
 125 /*
 126  * find a timer instance from the given timer id
 127  */
 128 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 129 {
 130         struct snd_timer *timer = NULL;
 131
 132         list_for_each_entry(timer, &snd_timer_list, device_list) {
 133                 if (timer->tmr_class != tid->dev_class)
 134                         continue;
 135                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 136                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 137                     (timer->card == NULL ||
 138                      timer->card->number != tid->card))
 139                         continue;
 140                 if (timer->tmr_device != tid->device)
 141                         continue;
 142                 if (timer->tmr_subdevice != tid->subdevice)
 143                         continue;
 144                 return timer;
 145         }
 146         return NULL;
 147 }
 148
 149 #ifdef CONFIG_MODULES
 150
 151 static void snd_timer_request(struct snd_timer_id *tid)
 152 {
 153         switch (tid->dev_class) {
 154         case SNDRV_TIMER_CLASS_GLOBAL:
 155                 if (tid->device < timer_limit)
 156                         request_module("snd-timer-%i", tid->device);
 157                 break;
 158         case SNDRV_TIMER_CLASS_CARD:
 159         case SNDRV_TIMER_CLASS_PCM:
 160                 if (tid->card < snd_ecards_limit)
 161                         request_module("snd-card-%i", tid->card);
 162                 break;
 163         default:
 164                 break;
 165         }
 166 }
 167
 168 #endif
 169
 170 /* move the slave if it belongs to the master; return 1 if match */
 171 static int check_matching_master_slave(struct snd_timer_instance *master,
 172                                        struct snd_timer_instance *slave)
 173 {
 174         if (slave->slave_class != master->slave_class ||
 175             slave->slave_id != master->slave_id)
 176                 return 0;
 177         if (master->timer->num_instances >= master->timer->max_instances)
 178                 return -EBUSY;
 179         list_move_tail(&slave->open_list, &master->slave_list_head);
 180         master->timer->num_instances++;
 181         spin_lock_irq(&slave_active_lock);
 182         spin_lock(&master->timer->lock);
 183         slave->master = master;
 184         slave->timer = master->timer;
 185         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 186                 list_add_tail(&slave->active_list, &master->slave_active_head);
 187         spin_unlock(&master->timer->lock);
 188         spin_unlock_irq(&slave_active_lock);
 189         return 1;
 190 }
 191
 192 /*
 193  * look for a master instance matching with the slave id of the given slave.
 194  * when found, relink the open_link of the slave.
 195  *
 196  * call this with register_mutex down.
 197  */
 198 static int snd_timer_check_slave(struct snd_timer_instance *slave)
 199 {
 200         struct snd_timer *timer;
 201         struct snd_timer_instance *master;
 202         int err = 0;
 203
 204         /* FIXME: it's really dumb to look up all entries.. */
 205         list_for_each_entry(timer, &snd_timer_list, device_list) {
 206                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 207                         err = check_matching_master_slave(master, slave);
 208                         if (err != 0) /* match found or error */
 209                                 goto out;
 210                 }
 211         }
 212  out:
 213         return err < 0 ? err : 0;
 214 }
 215
 216 /*
 217  * look for slave instances matching with the slave id of the given master.
 218  * when found, relink the open_link of slaves.
 219  *
 220  * call this with register_mutex down.
 221  */
 222 static int snd_timer_check_master(struct snd_timer_instance *master)
 223 {
 224         struct snd_timer_instance *slave, *tmp;
 225         int err = 0;
 226
 227         /* check all pending slaves */
 228         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 229                 err = check_matching_master_slave(master, slave);
 230                 if (err < 0)
 231                         break;
 232         }
 233         return err < 0 ? err : 0;
 234 }
 235
 236 static void snd_timer_close_locked(struct snd_timer_instance *timeri,
 237                                    struct device **card_devp_to_put);
 238
 239 /*
 240  * open a timer instance
 241  * when opening a master, the slave id must be here given.
 242  */
 243 int snd_timer_open(struct snd_timer_instance *timeri,
 244                    struct snd_timer_id *tid,
 245                    unsigned int slave_id)
 246 {
 247         struct snd_timer *timer;
 248         struct device *card_dev_to_put = NULL;
 249         int err;
 250
 251         mutex_lock(&register_mutex);
 252         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 253                 /* open a slave instance */
 254                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 255                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 256                         pr_debug("ALSA: timer: invalid slave class %i\n",
 257                                  tid->dev_sclass);
 258                         err = -EINVAL;
 259                         goto unlock;
 260                 }
 261                 if (num_slaves >= MAX_SLAVE_INSTANCES) {
 262                         err = -EBUSY;
 263                         goto unlock;
 264                 }
 265                 timeri->slave_class = tid->dev_sclass;
 266                 timeri->slave_id = tid->device;
 267                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 268                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 269                 num_slaves++;
 270                 err = snd_timer_check_slave(timeri);
 271                 if (err < 0)
 272                         goto close;
 273         }
 274
 275         /* open a master instance */
 276         timer = snd_timer_find(tid);
 277 #ifdef CONFIG_MODULES
 278         if (!timer) {
 279                 mutex_unlock(&register_mutex);
 280                 snd_timer_request(tid);
 281                 mutex_lock(&register_mutex);
 282                 timer = snd_timer_find(tid);
 283         }
 284 #endif
 285         if (!timer) {
 286                 err = -ENODEV;
 287                 goto unlock;
 288         }
 289         if (!list_empty(&timer->open_list_head)) {
 290                 struct snd_timer_instance *t =
 291                         list_entry(timer->open_list_head.next,
 292                                     struct snd_timer_instance, open_list);
 293                 if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 294                         err = -EBUSY;
 295                         goto unlock;
 296                 }
 297         }
 298         if (timer->num_instances >= timer->max_instances) {
 299                 err = -EBUSY;
 300                 goto unlock;
 301         }
 302         if (!try_module_get(timer->module)) {
 303                 err = -EBUSY;
 304                 goto unlock;
 305         }
 306         /* take a card refcount for safe disconnection */
 307         if (timer->card) {
 308                 get_device(&timer->card->card_dev);
 309                 card_dev_to_put = &timer->card->card_dev;
 310         }
 311
 312         if (list_empty(&timer->open_list_head) && timer->hw.open) {
 313                 err = timer->hw.open(timer);
 314                 if (err) {
 315                         module_put(timer->module);
 316                         goto unlock;
 317                 }
 318         }
 319
 320         timeri->timer = timer;
 321         timeri->slave_class = tid->dev_sclass;
 322         timeri->slave_id = slave_id;
 323
 324         list_add_tail(&timeri->open_list, &timer->open_list_head);
 325         timer->num_instances++;
 326         err = snd_timer_check_master(timeri);
 327  close:
 328         if (err < 0)
 329                 snd_timer_close_locked(timeri, &card_dev_to_put);
 330
 331  unlock:
 332         mutex_unlock(&register_mutex);
 333         /* put_device() is called after unlock for avoiding deadlock */
 334         if (err < 0 && card_dev_to_put)
 335                 put_device(card_dev_to_put);
 336         return err;
 337 }
 338 EXPORT_SYMBOL(snd_timer_open);
 339
 340 /*
 341  * close a timer instance
 342  * call this with register_mutex down.
 343  */
 344 static void snd_timer_close_locked(struct snd_timer_instance *timeri,
 345                                    struct device **card_devp_to_put)
 346 {
 347         struct snd_timer *timer = timeri->timer;
 348         struct snd_timer_instance *slave, *tmp;
 349
 350         if (timer) {
 351                 spin_lock_irq(&timer->lock);
 352                 timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
 353                 spin_unlock_irq(&timer->lock);
 354         }
 355
 356         if (!list_empty(&timeri->open_list)) {
 357                 list_del_init(&timeri->open_list);
 358                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 359                         num_slaves--;
 360         }
 361
 362         /* force to stop the timer */
 363         snd_timer_stop(timeri);
 364
 365         if (timer) {
 366                 timer->num_instances--;
 367                 /* wait, until the active callback is finished */
 368                 spin_lock_irq(&timer->lock);
 369                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 370                         spin_unlock_irq(&timer->lock);
 371                         udelay(10);
 372                         spin_lock_irq(&timer->lock);
 373                 }
 374                 spin_unlock_irq(&timer->lock);
 375
 376                 /* remove slave links */
 377                 spin_lock_irq(&slave_active_lock);
 378                 spin_lock(&timer->lock);
 379                 timeri->timer = NULL;
 380                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 381                                          open_list) {
 382                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 383                         timer->num_instances--;
 384                         slave->master = NULL;
 385                         slave->timer = NULL;
 386                         list_del_init(&slave->ack_list);
 387                         list_del_init(&slave->active_list);
 388                 }
 389                 spin_unlock(&timer->lock);
 390                 spin_unlock_irq(&slave_active_lock);
 391
 392                 /* slave doesn't need to release timer resources below */
 393                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 394                         timer = NULL;
 395         }
 396
 397         if (timer) {
 398                 if (list_empty(&timer->open_list_head) && timer->hw.close)
 399                         timer->hw.close(timer);
 400                 /* release a card refcount for safe disconnection */
 401                 if (timer->card)
 402                         *card_devp_to_put = &timer->card->card_dev;
 403                 module_put(timer->module);
 404         }
 405 }
 406
 407 /*
 408  * close a timer instance
 409  */
 410 void snd_timer_close(struct snd_timer_instance *timeri)
 411 {
 412         struct device *card_dev_to_put = NULL;
 413
 414         if (snd_BUG_ON(!timeri))
 415                 return;
 416
 417         mutex_lock(&register_mutex);
 418         snd_timer_close_locked(timeri, &card_dev_to_put);
 419         mutex_unlock(&register_mutex);
 420         /* put_device() is called after unlock for avoiding deadlock */
 421         if (card_dev_to_put)
 422                 put_device(card_dev_to_put);
 423 }
 424 EXPORT_SYMBOL(snd_timer_close);
 425
 426 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
 427 {
 428         if (timer->hw.c_resolution)
 429                 return timer->hw.c_resolution(timer);
 430         else
 431                 return timer->hw.resolution;
 432 }
 433
 434 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 435 {
 436         struct snd_timer * timer;
 437         unsigned long ret = 0;
 438         unsigned long flags;
 439
 440         if (timeri == NULL)
 441                 return 0;
 442         timer = timeri->timer;
 443         if (timer) {
 444                 spin_lock_irqsave(&timer->lock, flags);
 445                 ret = snd_timer_hw_resolution(timer);
 446                 spin_unlock_irqrestore(&timer->lock, flags);
 447         }
 448         return ret;
 449 }
 450 EXPORT_SYMBOL(snd_timer_resolution);
 451
 452 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 453 {
 454         struct snd_timer *timer = ti->timer;
 455         unsigned long resolution = 0;
 456         struct snd_timer_instance *ts;
 457         struct timespec tstamp;
 458
 459         if (timer_tstamp_monotonic)
 460                 ktime_get_ts(&tstamp);
 461         else
 462                 getnstimeofday(&tstamp);
 463         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 464                        event > SNDRV_TIMER_EVENT_PAUSE))
 465                 return;
 466         if (timer &&
 467             (event == SNDRV_TIMER_EVENT_START ||
 468              event == SNDRV_TIMER_EVENT_CONTINUE))
 469                 resolution = snd_timer_hw_resolution(timer);
 470         if (ti->ccallback)
 471                 ti->ccallback(ti, event, &tstamp, resolution);
 472         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 473                 return;
 474         if (timer == NULL)
 475                 return;
 476         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 477                 return;
 478         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 479                 if (ts->ccallback)
 480                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 481 }
 482
 483 /* start/continue a master timer */
 484 static int snd_timer_start1(struct snd_timer_instance *timeri,
 485                             bool start, unsigned long ticks)
 486 {
 487         struct snd_timer *timer;
 488         int result;
 489         unsigned long flags;
 490
 491         timer = timeri->timer;
 492         if (!timer)
 493                 return -EINVAL;
 494
 495         spin_lock_irqsave(&timer->lock, flags);
 496         if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
 497                 result = -EINVAL;
 498                 goto unlock;
 499         }
 500         if (timer->card && timer->card->shutdown) {
 501                 result = -ENODEV;
 502                 goto unlock;
 503         }
 504         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 505                              SNDRV_TIMER_IFLG_START)) {
 506                 result = -EBUSY;
 507                 goto unlock;
 508         }
 509
 510         if (start)
 511                 timeri->ticks = timeri->cticks = ticks;
 512         else if (!timeri->cticks)
 513                 timeri->cticks = 1;
 514         timeri->pticks = 0;
 515
 516         list_move_tail(&timeri->active_list, &timer->active_list_head);
 517         if (timer->running) {
 518                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 519                         goto __start_now;
 520                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 521                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 522                 result = 1; /* delayed start */
 523         } else {
 524                 if (start)
 525                         timer->sticks = ticks;
 526                 timer->hw.start(timer);
 527               __start_now:
 528                 timer->running++;
 529                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 530                 result = 0;
 531         }
 532         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 533                           SNDRV_TIMER_EVENT_CONTINUE);
 534  unlock:
 535         spin_unlock_irqrestore(&timer->lock, flags);
 536         return result;
 537 }
 538
 539 /* start/continue a slave timer */
 540 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
 541                                  bool start)
 542 {
 543         unsigned long flags;
 544         int err;
 545
 546         spin_lock_irqsave(&slave_active_lock, flags);
 547         if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
 548                 err = -EINVAL;
 549                 goto unlock;
 550         }
 551         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 552                 err = -EBUSY;
 553                 goto unlock;
 554         }
 555         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 556         if (timeri->master && timeri->timer) {
 557                 spin_lock(&timeri->timer->lock);
 558                 list_add_tail(&timeri->active_list,
 559                               &timeri->master->slave_active_head);
 560                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 561                                   SNDRV_TIMER_EVENT_CONTINUE);
 562                 spin_unlock(&timeri->timer->lock);
 563         }
 564         err = 1; /* delayed start */
 565  unlock:
 566         spin_unlock_irqrestore(&slave_active_lock, flags);
 567         return err;
 568 }
 569
 570 /* stop/pause a master timer */
 571 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
 572 {
 573         struct snd_timer *timer;
 574         int result = 0;
 575         unsigned long flags;
 576
 577         timer = timeri->timer;
 578         if (!timer)
 579                 return -EINVAL;
 580         spin_lock_irqsave(&timer->lock, flags);
 581         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 582                                SNDRV_TIMER_IFLG_START))) {
 583                 result = -EBUSY;
 584                 goto unlock;
 585         }
 586         list_del_init(&timeri->ack_list);
 587         list_del_init(&timeri->active_list);
 588         if (timer->card && timer->card->shutdown)
 589                 goto unlock;
 590         if (stop) {
 591                 timeri->cticks = timeri->ticks;
 592                 timeri->pticks = 0;
 593         }
 594         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 595             !(--timer->running)) {
 596                 timer->hw.stop(timer);
 597                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 598                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 599                         snd_timer_reschedule(timer, 0);
 600                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 601                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 602                                 timer->hw.start(timer);
 603                         }
 604                 }
 605         }
 606         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 607         if (stop)
 608                 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
 609         else
 610                 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
 611         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 612                           SNDRV_TIMER_EVENT_PAUSE);
 613  unlock:
 614         spin_unlock_irqrestore(&timer->lock, flags);
 615         return result;
 616 }
 617
 618 /* stop/pause a slave timer */
 619 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
 620 {
 621         unsigned long flags;
 622
 623         spin_lock_irqsave(&slave_active_lock, flags);
 624         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 625                 spin_unlock_irqrestore(&slave_active_lock, flags);
 626                 return -EBUSY;
 627         }
 628         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 629         if (timeri->timer) {
 630                 spin_lock(&timeri->timer->lock);
 631                 list_del_init(&timeri->ack_list);
 632                 list_del_init(&timeri->active_list);
 633                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 634                                   SNDRV_TIMER_EVENT_PAUSE);
 635                 spin_unlock(&timeri->timer->lock);
 636         }
 637         spin_unlock_irqrestore(&slave_active_lock, flags);
 638         return 0;
 639 }
 640
 641 /*
 642  *  start the timer instance
 643  */
 644 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 645 {
 646         if (timeri == NULL || ticks < 1)
 647                 return -EINVAL;
 648         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 649                 return snd_timer_start_slave(timeri, true);
 650         else
 651                 return snd_timer_start1(timeri, true, ticks);
 652 }
 653 EXPORT_SYMBOL(snd_timer_start);
 654
 655 /*
 656  * stop the timer instance.
 657  *
 658  * do not call this from the timer callback!
 659  */
 660 int snd_timer_stop(struct snd_timer_instance *timeri)
 661 {
 662         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 663                 return snd_timer_stop_slave(timeri, true);
 664         else
 665                 return snd_timer_stop1(timeri, true);
 666 }
 667 EXPORT_SYMBOL(snd_timer_stop);
 668
 669 /*
 670  * start again..  the tick is kept.
 671  */
 672 int snd_timer_continue(struct snd_timer_instance *timeri)
 673 {
 674         /* timer can continue only after pause */
 675         if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
 676                 return -EINVAL;
 677
 678         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 679                 return snd_timer_start_slave(timeri, false);
 680         else
 681                 return snd_timer_start1(timeri, false, 0);
 682 }
 683 EXPORT_SYMBOL(snd_timer_continue);
 684
 685 /*
 686  * pause.. remember the ticks left
 687  */
 688 int snd_timer_pause(struct snd_timer_instance * timeri)
 689 {
 690         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 691                 return snd_timer_stop_slave(timeri, false);
 692         else
 693                 return snd_timer_stop1(timeri, false);
 694 }
 695 EXPORT_SYMBOL(snd_timer_pause);
 696
 697 /*
 698  * reschedule the timer
 699  *
 700  * start pending instances and check the scheduling ticks.
 701  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 702  */
 703 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 704 {
 705         struct snd_timer_instance *ti;
 706         unsigned long ticks = ~0UL;
 707
 708         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 709                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 710                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 711                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 712                         timer->running++;
 713                 }
 714                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 715                         if (ticks > ti->cticks)
 716                                 ticks = ti->cticks;
 717                 }
 718         }
 719         if (ticks == ~0UL) {
 720                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 721                 return;
 722         }
 723         if (ticks > timer->hw.ticks)
 724                 ticks = timer->hw.ticks;
 725         if (ticks_left != ticks)
 726                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 727         timer->sticks = ticks;
 728 }
 729
 730 /* call callbacks in timer ack list */
 731 static void snd_timer_process_callbacks(struct snd_timer *timer,
 732                                         struct list_head *head)
 733 {
 734         struct snd_timer_instance *ti;
 735         unsigned long resolution, ticks;
 736
 737         while (!list_empty(head)) {
 738                 ti = list_first_entry(head, struct snd_timer_instance,
 739                                       ack_list);
 740
 741                 /* remove from ack_list and make empty */
 742                 list_del_init(&ti->ack_list);
 743
 744                 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
 745                         ticks = ti->pticks;
 746                         ti->pticks = 0;
 747                         resolution = ti->resolution;
 748                         ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 749                         spin_unlock(&timer->lock);
 750                         if (ti->callback)
 751                                 ti->callback(ti, resolution, ticks);
 752                         spin_lock(&timer->lock);
 753                         ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 754                 }
 755         }
 756 }
 757
 758 /* clear pending instances from ack list */
 759 static void snd_timer_clear_callbacks(struct snd_timer *timer,
 760                                       struct list_head *head)
 761 {
 762         unsigned long flags;
 763
 764         spin_lock_irqsave(&timer->lock, flags);
 765         while (!list_empty(head))
 766                 list_del_init(head->next);
 767         spin_unlock_irqrestore(&timer->lock, flags);
 768 }
 769
 770 /*
 771  * timer tasklet
 772  *
 773  */
 774 static void snd_timer_tasklet(unsigned long arg)
 775 {
 776         struct snd_timer *timer = (struct snd_timer *) arg;
 777         unsigned long flags;
 778
 779         if (timer->card && timer->card->shutdown) {
 780                 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
 781                 return;
 782         }
 783
 784         spin_lock_irqsave(&timer->lock, flags);
 785         snd_timer_process_callbacks(timer, &timer->sack_list_head);
 786         spin_unlock_irqrestore(&timer->lock, flags);
 787 }
 788
 789 /*
 790  * timer interrupt
 791  *
 792  * ticks_left is usually equal to timer->sticks.
 793  *
 794  */
 795 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 796 {
 797         struct snd_timer_instance *ti, *ts, *tmp;
 798         unsigned long resolution;
 799         struct list_head *ack_list_head;
 800         unsigned long flags;
 801         int use_tasklet = 0;
 802
 803         if (timer == NULL)
 804                 return;
 805
 806         if (timer->card && timer->card->shutdown) {
 807                 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
 808                 return;
 809         }
 810
 811         spin_lock_irqsave(&timer->lock, flags);
 812
 813         /* remember the current resolution */
 814         resolution = snd_timer_hw_resolution(timer);
 815
 816         /* loop for all active instances
 817          * Here we cannot use list_for_each_entry because the active_list of a
 818          * processed instance is relinked to done_list_head before the callback
 819          * is called.
 820          */
 821         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 822                                  active_list) {
 823                 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
 824                         continue;
 825                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 826                         continue;
 827                 ti->pticks += ticks_left;
 828                 ti->resolution = resolution;
 829                 if (ti->cticks < ticks_left)
 830                         ti->cticks = 0;
 831                 else
 832                         ti->cticks -= ticks_left;
 833                 if (ti->cticks) /* not expired */
 834                         continue;
 835                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 836                         ti->cticks = ti->ticks;
 837                 } else {
 838                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 839                         --timer->running;
 840                         list_del_init(&ti->active_list);
 841                 }
 842                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 843                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 844                         ack_list_head = &timer->ack_list_head;
 845                 else
 846                         ack_list_head = &timer->sack_list_head;
 847                 if (list_empty(&ti->ack_list))
 848                         list_add_tail(&ti->ack_list, ack_list_head);
 849                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 850                         ts->pticks = ti->pticks;
 851                         ts->resolution = resolution;
 852                         if (list_empty(&ts->ack_list))
 853                                 list_add_tail(&ts->ack_list, ack_list_head);
 854                 }
 855         }
 856         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 857                 snd_timer_reschedule(timer, timer->sticks);
 858         if (timer->running) {
 859                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 860                         timer->hw.stop(timer);
 861                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 862                 }
 863                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 864                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 865                         /* restart timer */
 866                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 867                         timer->hw.start(timer);
 868                 }
 869         } else {
 870                 timer->hw.stop(timer);
 871         }
 872
 873         /* now process all fast callbacks */
 874         snd_timer_process_callbacks(timer, &timer->ack_list_head);
 875
 876         /* do we have any slow callbacks? */
 877         use_tasklet = !list_empty(&timer->sack_list_head);
 878         spin_unlock_irqrestore(&timer->lock, flags);
 879
 880         if (use_tasklet)
 881                 tasklet_schedule(&timer->task_queue);
 882 }
 883 EXPORT_SYMBOL(snd_timer_interrupt);
 884
 885 /*
 886
 887  */
 888
 889 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 890                   struct snd_timer **rtimer)
 891 {
 892         struct snd_timer *timer;
 893         int err;
 894         static struct snd_device_ops ops = {
 895                 .dev_free = snd_timer_dev_free,
 896                 .dev_register = snd_timer_dev_register,
 897                 .dev_disconnect = snd_timer_dev_disconnect,
 898         };
 899
 900         if (snd_BUG_ON(!tid))
 901                 return -EINVAL;
 902         if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
 903             tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
 904                 if (WARN_ON(!card))
 905                         return -EINVAL;
 906         }
 907         if (rtimer)
 908                 *rtimer = NULL;
 909         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 910         if (!timer)
 911                 return -ENOMEM;
 912         timer->tmr_class = tid->dev_class;
 913         timer->card = card;
 914         timer->tmr_device = tid->device;
 915         timer->tmr_subdevice = tid->subdevice;
 916         if (id)
 917                 strlcpy(timer->id, id, sizeof(timer->id));
 918         timer->sticks = 1;
 919         INIT_LIST_HEAD(&timer->device_list);
 920         INIT_LIST_HEAD(&timer->open_list_head);
 921         INIT_LIST_HEAD(&timer->active_list_head);
 922         INIT_LIST_HEAD(&timer->ack_list_head);
 923         INIT_LIST_HEAD(&timer->sack_list_head);
 924         spin_lock_init(&timer->lock);
 925         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 926                      (unsigned long)timer);
 927         timer->max_instances = 1000; /* default limit per timer */
 928         if (card != NULL) {
 929                 timer->module = card->module;
 930                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 931                 if (err < 0) {
 932                         snd_timer_free(timer);
 933                         return err;
 934                 }
 935         }
 936         if (rtimer)
 937                 *rtimer = timer;
 938         return 0;
 939 }
 940 EXPORT_SYMBOL(snd_timer_new);
 941
 942 static int snd_timer_free(struct snd_timer *timer)
 943 {
 944         if (!timer)
 945                 return 0;
 946
 947         mutex_lock(&register_mutex);
 948         if (! list_empty(&timer->open_list_head)) {
 949                 struct list_head *p, *n;
 950                 struct snd_timer_instance *ti;
 951                 pr_warn("ALSA: timer %p is busy?\n", timer);
 952                 list_for_each_safe(p, n, &timer->open_list_head) {
 953                         list_del_init(p);
 954                         ti = list_entry(p, struct snd_timer_instance, open_list);
 955                         ti->timer = NULL;
 956                 }
 957         }
 958         list_del(&timer->device_list);
 959         mutex_unlock(&register_mutex);
 960
 961         if (timer->private_free)
 962                 timer->private_free(timer);
 963         kfree(timer);
 964         return 0;
 965 }
 966
 967 static int snd_timer_dev_free(struct snd_device *device)
 968 {
 969         struct snd_timer *timer = device->device_data;
 970         return snd_timer_free(timer);
 971 }
 972
 973 static int snd_timer_dev_register(struct snd_device *dev)
 974 {
 975         struct snd_timer *timer = dev->device_data;
 976         struct snd_timer *timer1;
 977
 978         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 979                 return -ENXIO;
 980         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 981             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 982                 return -EINVAL;
 983
 984         mutex_lock(&register_mutex);
 985         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 986                 if (timer1->tmr_class > timer->tmr_class)
 987                         break;
 988                 if (timer1->tmr_class < timer->tmr_class)
 989                         continue;
 990                 if (timer1->card && timer->card) {
 991                         if (timer1->card->number > timer->card->number)
 992                                 break;
 993                         if (timer1->card->number < timer->card->number)
 994                                 continue;
 995                 }
 996                 if (timer1->tmr_device > timer->tmr_device)
 997                         break;
 998                 if (timer1->tmr_device < timer->tmr_device)
 999                         continue;
1000                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
1001                         break;
1002                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
1003                         continue;
1004                 /* conflicts.. */
1005                 mutex_unlock(&register_mutex);
1006                 return -EBUSY;
1007         }
1008         list_add_tail(&timer->device_list, &timer1->device_list);
1009         mutex_unlock(&register_mutex);
1010         return 0;
1011 }
1012
1013 static int snd_timer_dev_disconnect(struct snd_device *device)
1014 {
1015         struct snd_timer *timer = device->device_data;
1016         struct snd_timer_instance *ti;
1017
1018         mutex_lock(&register_mutex);
1019         list_del_init(&timer->device_list);
1020         /* wake up pending sleepers */
1021         list_for_each_entry(ti, &timer->open_list_head, open_list) {
1022                 if (ti->disconnect)
1023                         ti->disconnect(ti);
1024         }
1025         mutex_unlock(&register_mutex);
1026         return 0;
1027 }
1028
1029 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1030 {
1031         unsigned long flags;
1032         unsigned long resolution = 0;
1033         struct snd_timer_instance *ti, *ts;
1034
1035         if (timer->card && timer->card->shutdown)
1036                 return;
1037         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1038                 return;
1039         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1040                        event > SNDRV_TIMER_EVENT_MRESUME))
1041                 return;
1042         spin_lock_irqsave(&timer->lock, flags);
1043         if (event == SNDRV_TIMER_EVENT_MSTART ||
1044             event == SNDRV_TIMER_EVENT_MCONTINUE ||
1045             event == SNDRV_TIMER_EVENT_MRESUME)
1046                 resolution = snd_timer_hw_resolution(timer);
1047         list_for_each_entry(ti, &timer->active_list_head, active_list) {
1048                 if (ti->ccallback)
1049                         ti->ccallback(ti, event, tstamp, resolution);
1050                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1051                         if (ts->ccallback)
1052                                 ts->ccallback(ts, event, tstamp, resolution);
1053         }
1054         spin_unlock_irqrestore(&timer->lock, flags);
1055 }
1056 EXPORT_SYMBOL(snd_timer_notify);
1057
1058 /*
1059  * exported functions for global timers
1060  */
1061 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1062 {
1063         struct snd_timer_id tid;
1064
1065         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1066         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1067         tid.card = -1;
1068         tid.device = device;
1069         tid.subdevice = 0;
1070         return snd_timer_new(NULL, id, &tid, rtimer);
1071 }
1072 EXPORT_SYMBOL(snd_timer_global_new);
1073
1074 int snd_timer_global_free(struct snd_timer *timer)
1075 {
1076         return snd_timer_free(timer);
1077 }
1078 EXPORT_SYMBOL(snd_timer_global_free);
1079
1080 int snd_timer_global_register(struct snd_timer *timer)
1081 {
1082         struct snd_device dev;
1083
1084         memset(&dev, 0, sizeof(dev));
1085         dev.device_data = timer;
1086         return snd_timer_dev_register(&dev);
1087 }
1088 EXPORT_SYMBOL(snd_timer_global_register);
1089
1090 /*
1091  *  System timer
1092  */
1093
1094 struct snd_timer_system_private {
1095         struct timer_list tlist;
1096         struct snd_timer *snd_timer;
1097         unsigned long last_expires;
1098         unsigned long last_jiffies;
1099         unsigned long correction;
1100 };
1101
1102 static void snd_timer_s_function(struct timer_list *t)
1103 {
1104         struct snd_timer_system_private *priv = from_timer(priv, t,
1105                                                                 tlist);
1106         struct snd_timer *timer = priv->snd_timer;
1107         unsigned long jiff = jiffies;
1108         if (time_after(jiff, priv->last_expires))
1109                 priv->correction += (long)jiff - (long)priv->last_expires;
1110         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1111 }
1112
1113 static int snd_timer_s_start(struct snd_timer * timer)
1114 {
1115         struct snd_timer_system_private *priv;
1116         unsigned long njiff;
1117
1118         priv = (struct snd_timer_system_private *) timer->private_data;
1119         njiff = (priv->last_jiffies = jiffies);
1120         if (priv->correction > timer->sticks - 1) {
1121                 priv->correction -= timer->sticks - 1;
1122                 njiff++;
1123         } else {
1124                 njiff += timer->sticks - priv->correction;
1125                 priv->correction = 0;
1126         }
1127         priv->last_expires = njiff;
1128         mod_timer(&priv->tlist, njiff);
1129         return 0;
1130 }
1131
1132 static int snd_timer_s_stop(struct snd_timer * timer)
1133 {
1134         struct snd_timer_system_private *priv;
1135         unsigned long jiff;
1136
1137         priv = (struct snd_timer_system_private *) timer->private_data;
1138         del_timer(&priv->tlist);
1139         jiff = jiffies;
1140         if (time_before(jiff, priv->last_expires))
1141                 timer->sticks = priv->last_expires - jiff;
1142         else
1143                 timer->sticks = 1;
1144         priv->correction = 0;
1145         return 0;
1146 }
1147
1148 static int snd_timer_s_close(struct snd_timer *timer)
1149 {
1150         struct snd_timer_system_private *priv;
1151
1152         priv = (struct snd_timer_system_private *)timer->private_data;
1153         del_timer_sync(&priv->tlist);
1154         return 0;
1155 }
1156
1157 static struct snd_timer_hardware snd_timer_system =
1158 {
1159         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1160         .resolution =   1000000000L / HZ,
1161         .ticks =        10000000L,
1162         .close =        snd_timer_s_close,
1163         .start =        snd_timer_s_start,
1164         .stop =         snd_timer_s_stop
1165 };
1166
1167 static void snd_timer_free_system(struct snd_timer *timer)
1168 {
1169         kfree(timer->private_data);
1170 }
1171
1172 static int snd_timer_register_system(void)
1173 {
1174         struct snd_timer *timer;
1175         struct snd_timer_system_private *priv;
1176         int err;
1177
1178         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1179         if (err < 0)
1180                 return err;
1181         strcpy(timer->name, "system timer");
1182         timer->hw = snd_timer_system;
1183         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1184         if (priv == NULL) {
1185                 snd_timer_free(timer);
1186                 return -ENOMEM;
1187         }
1188         priv->snd_timer = timer;
1189         timer_setup(&priv->tlist, snd_timer_s_function, 0);
1190         timer->private_data = priv;
1191         timer->private_free = snd_timer_free_system;
1192         return snd_timer_global_register(timer);
1193 }
1194
1195 #ifdef CONFIG_SND_PROC_FS
1196 /*
1197  *  Info interface
1198  */
1199
1200 static void snd_timer_proc_read(struct snd_info_entry *entry,
1201                                 struct snd_info_buffer *buffer)
1202 {
1203         struct snd_timer *timer;
1204         struct snd_timer_instance *ti;
1205
1206         mutex_lock(&register_mutex);
1207         list_for_each_entry(timer, &snd_timer_list, device_list) {
1208                 if (timer->card && timer->card->shutdown)
1209                         continue;
1210                 switch (timer->tmr_class) {
1211                 case SNDRV_TIMER_CLASS_GLOBAL:
1212                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1213                         break;
1214                 case SNDRV_TIMER_CLASS_CARD:
1215                         snd_iprintf(buffer, "C%i-%i: ",
1216                                     timer->card->number, timer->tmr_device);
1217                         break;
1218                 case SNDRV_TIMER_CLASS_PCM:
1219                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1220                                     timer->tmr_device, timer->tmr_subdevice);
1221                         break;
1222                 default:
1223                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1224                                     timer->card ? timer->card->number : -1,
1225                                     timer->tmr_device, timer->tmr_subdevice);
1226                 }
1227                 snd_iprintf(buffer, "%s :", timer->name);
1228                 if (timer->hw.resolution)
1229                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1230                                     timer->hw.resolution / 1000,
1231                                     timer->hw.resolution % 1000,
1232                                     timer->hw.ticks);
1233                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1234                         snd_iprintf(buffer, " SLAVE");
1235                 snd_iprintf(buffer, "\n");
1236                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1237                         snd_iprintf(buffer, "  Client %s : %s\n",
1238                                     ti->owner ? ti->owner : "unknown",
1239                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1240                                                  SNDRV_TIMER_IFLG_RUNNING)
1241                                     ? "running" : "stopped");
1242         }
1243         mutex_unlock(&register_mutex);
1244 }
1245
1246 static struct snd_info_entry *snd_timer_proc_entry;
1247
1248 static void __init snd_timer_proc_init(void)
1249 {
1250         struct snd_info_entry *entry;
1251
1252         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1253         if (entry != NULL) {
1254                 entry->c.text.read = snd_timer_proc_read;
1255                 if (snd_info_register(entry) < 0) {
1256                         snd_info_free_entry(entry);
1257                         entry = NULL;
1258                 }
1259         }
1260         snd_timer_proc_entry = entry;
1261 }
1262
1263 static void __exit snd_timer_proc_done(void)
1264 {
1265         snd_info_free_entry(snd_timer_proc_entry);
1266 }
1267 #else /* !CONFIG_SND_PROC_FS */
1268 #define snd_timer_proc_init()
1269 #define snd_timer_proc_done()
1270 #endif
1271
1272 /*
1273  *  USER SPACE interface
1274  */
1275
1276 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1277                                      unsigned long resolution,
1278                                      unsigned long ticks)
1279 {
1280         struct snd_timer_user *tu = timeri->callback_data;
1281         struct snd_timer_read *r;
1282         int prev;
1283
1284         spin_lock(&tu->qlock);
1285         if (tu->qused > 0) {
1286                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1287                 r = &tu->queue[prev];
1288                 if (r->resolution == resolution) {
1289                         r->ticks += ticks;
1290                         goto __wake;
1291                 }
1292         }
1293         if (tu->qused >= tu->queue_size) {
1294                 tu->overrun++;
1295         } else {
1296                 r = &tu->queue[tu->qtail++];
1297                 tu->qtail %= tu->queue_size;
1298                 r->resolution = resolution;
1299                 r->ticks = ticks;
1300                 tu->qused++;
1301         }
1302       __wake:
1303         spin_unlock(&tu->qlock);
1304         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1305         wake_up(&tu->qchange_sleep);
1306 }
1307
1308 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1309                                             struct snd_timer_tread *tread)
1310 {
1311         if (tu->qused >= tu->queue_size) {
1312                 tu->overrun++;
1313         } else {
1314                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1315                 tu->qtail %= tu->queue_size;
1316                 tu->qused++;
1317         }
1318 }
1319
1320 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1321                                      int event,
1322                                      struct timespec *tstamp,
1323                                      unsigned long resolution)
1324 {
1325         struct snd_timer_user *tu = timeri->callback_data;
1326         struct snd_timer_tread r1;
1327         unsigned long flags;
1328
1329         if (event >= SNDRV_TIMER_EVENT_START &&
1330             event <= SNDRV_TIMER_EVENT_PAUSE)
1331                 tu->tstamp = *tstamp;
1332         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1333                 return;
1334         memset(&r1, 0, sizeof(r1));
1335         r1.event = event;
1336         r1.tstamp = *tstamp;
1337         r1.val = resolution;
1338         spin_lock_irqsave(&tu->qlock, flags);
1339         snd_timer_user_append_to_tqueue(tu, &r1);
1340         spin_unlock_irqrestore(&tu->qlock, flags);
1341         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1342         wake_up(&tu->qchange_sleep);
1343 }
1344
1345 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1346 {
1347         struct snd_timer_user *tu = timeri->callback_data;
1348
1349         tu->disconnected = true;
1350         wake_up(&tu->qchange_sleep);
1351 }
1352
1353 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1354                                       unsigned long resolution,
1355                                       unsigned long ticks)
1356 {
1357         struct snd_timer_user *tu = timeri->callback_data;
1358         struct snd_timer_tread *r, r1;
1359         struct timespec tstamp;
1360         int prev, append = 0;
1361
1362         memset(&r1, 0, sizeof(r1));
1363         memset(&tstamp, 0, sizeof(tstamp));
1364         spin_lock(&tu->qlock);
1365         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1366                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1367                 spin_unlock(&tu->qlock);
1368                 return;
1369         }
1370         if (tu->last_resolution != resolution || ticks > 0) {
1371                 if (timer_tstamp_monotonic)
1372                         ktime_get_ts(&tstamp);
1373                 else
1374                         getnstimeofday(&tstamp);
1375         }
1376         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1377             tu->last_resolution != resolution) {
1378                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1379                 r1.tstamp = tstamp;
1380                 r1.val = resolution;
1381                 snd_timer_user_append_to_tqueue(tu, &r1);
1382                 tu->last_resolution = resolution;
1383                 append++;
1384         }
1385         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1386                 goto __wake;
1387         if (ticks == 0)
1388                 goto __wake;
1389         if (tu->qused > 0) {
1390                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1391                 r = &tu->tqueue[prev];
1392                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1393                         r->tstamp = tstamp;
1394                         r->val += ticks;
1395                         append++;
1396                         goto __wake;
1397                 }
1398         }
1399         r1.event = SNDRV_TIMER_EVENT_TICK;
1400         r1.tstamp = tstamp;
1401         r1.val = ticks;
1402         snd_timer_user_append_to_tqueue(tu, &r1);
1403         append++;
1404       __wake:
1405         spin_unlock(&tu->qlock);
1406         if (append == 0)
1407                 return;
1408         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1409         wake_up(&tu->qchange_sleep);
1410 }
1411
1412 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1413 {
1414         struct snd_timer_read *queue = NULL;
1415         struct snd_timer_tread *tqueue = NULL;
1416
1417         if (tu->tread) {
1418                 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1419                 if (!tqueue)
1420                         return -ENOMEM;
1421         } else {
1422                 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1423                 if (!queue)
1424                         return -ENOMEM;
1425         }
1426
1427         spin_lock_irq(&tu->qlock);
1428         kfree(tu->queue);
1429         kfree(tu->tqueue);
1430         tu->queue_size = size;
1431         tu->queue = queue;
1432         tu->tqueue = tqueue;
1433         tu->qhead = tu->qtail = tu->qused = 0;
1434         spin_unlock_irq(&tu->qlock);
1435
1436         return 0;
1437 }
1438
1439 static int snd_timer_user_open(struct inode *inode, struct file *file)
1440 {
1441         struct snd_timer_user *tu;
1442         int err;
1443
1444         err = stream_open(inode, file);
1445         if (err < 0)
1446                 return err;
1447
1448         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1449         if (tu == NULL)
1450                 return -ENOMEM;
1451         spin_lock_init(&tu->qlock);
1452         init_waitqueue_head(&tu->qchange_sleep);
1453         mutex_init(&tu->ioctl_lock);
1454         tu->ticks = 1;
1455         if (realloc_user_queue(tu, 128) < 0) {
1456                 kfree(tu);
1457                 return -ENOMEM;
1458         }
1459         file->private_data = tu;
1460         return 0;
1461 }
1462
1463 static int snd_timer_user_release(struct inode *inode, struct file *file)
1464 {
1465         struct snd_timer_user *tu;
1466
1467         if (file->private_data) {
1468                 tu = file->private_data;
1469                 file->private_data = NULL;
1470                 mutex_lock(&tu->ioctl_lock);
1471                 if (tu->timeri) {
1472                         snd_timer_close(tu->timeri);
1473                         snd_timer_instance_free(tu->timeri);
1474                 }
1475                 mutex_unlock(&tu->ioctl_lock);
1476                 kfree(tu->queue);
1477                 kfree(tu->tqueue);
1478                 kfree(tu);
1479         }
1480         return 0;
1481 }
1482
1483 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1484 {
1485         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1486         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1487         id->card = -1;
1488         id->device = -1;
1489         id->subdevice = -1;
1490 }
1491
1492 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1493 {
1494         id->dev_class = timer->tmr_class;
1495         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1496         id->card = timer->card ? timer->card->number : -1;
1497         id->device = timer->tmr_device;
1498         id->subdevice = timer->tmr_subdevice;
1499 }
1500
1501 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1502 {
1503         struct snd_timer_id id;
1504         struct snd_timer *timer;
1505         struct list_head *p;
1506
1507         if (copy_from_user(&id, _tid, sizeof(id)))
1508                 return -EFAULT;
1509         mutex_lock(&register_mutex);
1510         if (id.dev_class < 0) {         /* first item */
1511                 if (list_empty(&snd_timer_list))
1512                         snd_timer_user_zero_id(&id);
1513                 else {
1514                         timer = list_entry(snd_timer_list.next,
1515                                            struct snd_timer, device_list);
1516                         snd_timer_user_copy_id(&id, timer);
1517                 }
1518         } else {
1519                 switch (id.dev_class) {
1520                 case SNDRV_TIMER_CLASS_GLOBAL:
1521                         id.device = id.device < 0 ? 0 : id.device + 1;
1522                         list_for_each(p, &snd_timer_list) {
1523                                 timer = list_entry(p, struct snd_timer, device_list);
1524                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1525                                         snd_timer_user_copy_id(&id, timer);
1526                                         break;
1527                                 }
1528                                 if (timer->tmr_device >= id.device) {
1529                                         snd_timer_user_copy_id(&id, timer);
1530                                         break;
1531                                 }
1532                         }
1533                         if (p == &snd_timer_list)
1534                                 snd_timer_user_zero_id(&id);
1535                         break;
1536                 case SNDRV_TIMER_CLASS_CARD:
1537                 case SNDRV_TIMER_CLASS_PCM:
1538                         if (id.card < 0) {
1539                                 id.card = 0;
1540                         } else {
1541                                 if (id.device < 0) {
1542                                         id.device = 0;
1543                                 } else {
1544                                         if (id.subdevice < 0)
1545                                                 id.subdevice = 0;
1546                                         else if (id.subdevice < INT_MAX)
1547                                                 id.subdevice++;
1548                                 }
1549                         }
1550                         list_for_each(p, &snd_timer_list) {
1551                                 timer = list_entry(p, struct snd_timer, device_list);
1552                                 if (timer->tmr_class > id.dev_class) {
1553                                         snd_timer_user_copy_id(&id, timer);
1554                                         break;
1555                                 }
1556                                 if (timer->tmr_class < id.dev_class)
1557                                         continue;
1558                                 if (timer->card->number > id.card) {
1559                                         snd_timer_user_copy_id(&id, timer);
1560                                         break;
1561                                 }
1562                                 if (timer->card->number < id.card)
1563                                         continue;
1564                                 if (timer->tmr_device > id.device) {
1565                                         snd_timer_user_copy_id(&id, timer);
1566                                         break;
1567                                 }
1568                                 if (timer->tmr_device < id.device)
1569                                         continue;
1570                                 if (timer->tmr_subdevice > id.subdevice) {
1571                                         snd_timer_user_copy_id(&id, timer);
1572                                         break;
1573                                 }
1574                                 if (timer->tmr_subdevice < id.subdevice)
1575                                         continue;
1576                                 snd_timer_user_copy_id(&id, timer);
1577                                 break;
1578                         }
1579                         if (p == &snd_timer_list)
1580                                 snd_timer_user_zero_id(&id);
1581                         break;
1582                 default:
1583                         snd_timer_user_zero_id(&id);
1584                 }
1585         }
1586         mutex_unlock(&register_mutex);
1587         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1588                 return -EFAULT;
1589         return 0;
1590 }
1591
1592 static int snd_timer_user_ginfo(struct file *file,
1593                                 struct snd_timer_ginfo __user *_ginfo)
1594 {
1595         struct snd_timer_ginfo *ginfo;
1596         struct snd_timer_id tid;
1597         struct snd_timer *t;
1598         struct list_head *p;
1599         int err = 0;
1600
1601         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1602         if (IS_ERR(ginfo))
1603                 return PTR_ERR(ginfo);
1604
1605         tid = ginfo->tid;
1606         memset(ginfo, 0, sizeof(*ginfo));
1607         ginfo->tid = tid;
1608         mutex_lock(&register_mutex);
1609         t = snd_timer_find(&tid);
1610         if (t != NULL) {
1611                 ginfo->card = t->card ? t->card->number : -1;
1612                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1613                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1614                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1615                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1616                 ginfo->resolution = t->hw.resolution;
1617                 if (t->hw.resolution_min > 0) {
1618                         ginfo->resolution_min = t->hw.resolution_min;
1619                         ginfo->resolution_max = t->hw.resolution_max;
1620                 }
1621                 list_for_each(p, &t->open_list_head) {
1622                         ginfo->clients++;
1623                 }
1624         } else {
1625                 err = -ENODEV;
1626         }
1627         mutex_unlock(&register_mutex);
1628         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1629                 err = -EFAULT;
1630         kfree(ginfo);
1631         return err;
1632 }
1633
1634 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1635 {
1636         struct snd_timer *t;
1637         int err;
1638
1639         mutex_lock(&register_mutex);
1640         t = snd_timer_find(&gparams->tid);
1641         if (!t) {
1642                 err = -ENODEV;
1643                 goto _error;
1644         }
1645         if (!list_empty(&t->open_list_head)) {
1646                 err = -EBUSY;
1647                 goto _error;
1648         }
1649         if (!t->hw.set_period) {
1650                 err = -ENOSYS;
1651                 goto _error;
1652         }
1653         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1654 _error:
1655         mutex_unlock(&register_mutex);
1656         return err;
1657 }
1658
1659 static int snd_timer_user_gparams(struct file *file,
1660                                   struct snd_timer_gparams __user *_gparams)
1661 {
1662         struct snd_timer_gparams gparams;
1663
1664         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1665                 return -EFAULT;
1666         return timer_set_gparams(&gparams);
1667 }
1668
1669 static int snd_timer_user_gstatus(struct file *file,
1670                                   struct snd_timer_gstatus __user *_gstatus)
1671 {
1672         struct snd_timer_gstatus gstatus;
1673         struct snd_timer_id tid;
1674         struct snd_timer *t;
1675         int err = 0;
1676
1677         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1678                 return -EFAULT;
1679         tid = gstatus.tid;
1680         memset(&gstatus, 0, sizeof(gstatus));
1681         gstatus.tid = tid;
1682         mutex_lock(&register_mutex);
1683         t = snd_timer_find(&tid);
1684         if (t != NULL) {
1685                 spin_lock_irq(&t->lock);
1686                 gstatus.resolution = snd_timer_hw_resolution(t);
1687                 if (t->hw.precise_resolution) {
1688                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1689                                                  &gstatus.resolution_den);
1690                 } else {
1691                         gstatus.resolution_num = gstatus.resolution;
1692                         gstatus.resolution_den = 1000000000uL;
1693                 }
1694                 spin_unlock_irq(&t->lock);
1695         } else {
1696                 err = -ENODEV;
1697         }
1698         mutex_unlock(&register_mutex);
1699         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1700                 err = -EFAULT;
1701         return err;
1702 }
1703
1704 static int snd_timer_user_tselect(struct file *file,
1705                                   struct snd_timer_select __user *_tselect)
1706 {
1707         struct snd_timer_user *tu;
1708         struct snd_timer_select tselect;
1709         char str[32];
1710         int err = 0;
1711
1712         tu = file->private_data;
1713         if (tu->timeri) {
1714                 snd_timer_close(tu->timeri);
1715                 snd_timer_instance_free(tu->timeri);
1716                 tu->timeri = NULL;
1717         }
1718         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1719                 err = -EFAULT;
1720                 goto __err;
1721         }
1722         sprintf(str, "application %i", current->pid);
1723         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1724                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1725         tu->timeri = snd_timer_instance_new(str);
1726         if (!tu->timeri) {
1727                 err = -ENOMEM;
1728                 goto __err;
1729         }
1730
1731         tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1732         tu->timeri->callback = tu->tread
1733                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1734         tu->timeri->ccallback = snd_timer_user_ccallback;
1735         tu->timeri->callback_data = (void *)tu;
1736         tu->timeri->disconnect = snd_timer_user_disconnect;
1737
1738         err = snd_timer_open(tu->timeri, &tselect.id, current->pid);
1739         if (err < 0) {
1740                 snd_timer_instance_free(tu->timeri);
1741                 tu->timeri = NULL;
1742         }
1743
1744       __err:
1745         return err;
1746 }
1747
1748 static int snd_timer_user_info(struct file *file,
1749                                struct snd_timer_info __user *_info)
1750 {
1751         struct snd_timer_user *tu;
1752         struct snd_timer_info *info;
1753         struct snd_timer *t;
1754         int err = 0;
1755
1756         tu = file->private_data;
1757         if (!tu->timeri)
1758                 return -EBADFD;
1759         t = tu->timeri->timer;
1760         if (!t)
1761                 return -EBADFD;
1762
1763         info = kzalloc(sizeof(*info), GFP_KERNEL);
1764         if (! info)
1765                 return -ENOMEM;
1766         info->card = t->card ? t->card->number : -1;
1767         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1768                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1769         strlcpy(info->id, t->id, sizeof(info->id));
1770         strlcpy(info->name, t->name, sizeof(info->name));
1771         info->resolution = t->hw.resolution;
1772         if (copy_to_user(_info, info, sizeof(*_info)))
1773                 err = -EFAULT;
1774         kfree(info);
1775         return err;
1776 }
1777
1778 static int snd_timer_user_params(struct file *file,
1779                                  struct snd_timer_params __user *_params)
1780 {
1781         struct snd_timer_user *tu;
1782         struct snd_timer_params params;
1783         struct snd_timer *t;
1784         int err;
1785
1786         tu = file->private_data;
1787         if (!tu->timeri)
1788                 return -EBADFD;
1789         t = tu->timeri->timer;
1790         if (!t)
1791                 return -EBADFD;
1792         if (copy_from_user(&params, _params, sizeof(params)))
1793                 return -EFAULT;
1794         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1795                 u64 resolution;
1796
1797                 if (params.ticks < 1) {
1798                         err = -EINVAL;
1799                         goto _end;
1800                 }
1801
1802                 /* Don't allow resolution less than 1ms */
1803                 resolution = snd_timer_resolution(tu->timeri);
1804                 resolution *= params.ticks;
1805                 if (resolution < 1000000) {
1806                         err = -EINVAL;
1807                         goto _end;
1808                 }
1809         }
1810         if (params.queue_size > 0 &&
1811             (params.queue_size < 32 || params.queue_size > 1024)) {
1812                 err = -EINVAL;
1813                 goto _end;
1814         }
1815         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1816                               (1<<SNDRV_TIMER_EVENT_TICK)|
1817                               (1<<SNDRV_TIMER_EVENT_START)|
1818                               (1<<SNDRV_TIMER_EVENT_STOP)|
1819                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1820                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1821                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1822                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1823                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1824                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1825                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1826                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1827                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1828                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1829                 err = -EINVAL;
1830                 goto _end;
1831         }
1832         snd_timer_stop(tu->timeri);
1833         spin_lock_irq(&t->lock);
1834         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1835                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1836                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1837         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1838                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1839         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1840                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1841         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1842                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1843         spin_unlock_irq(&t->lock);
1844         if (params.queue_size > 0 &&
1845             (unsigned int)tu->queue_size != params.queue_size) {
1846                 err = realloc_user_queue(tu, params.queue_size);
1847                 if (err < 0)
1848                         goto _end;
1849         }
1850         spin_lock_irq(&tu->qlock);
1851         tu->qhead = tu->qtail = tu->qused = 0;
1852         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1853                 if (tu->tread) {
1854                         struct snd_timer_tread tread;
1855                         memset(&tread, 0, sizeof(tread));
1856                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1857                         tread.tstamp.tv_sec = 0;
1858                         tread.tstamp.tv_nsec = 0;
1859                         tread.val = 0;
1860                         snd_timer_user_append_to_tqueue(tu, &tread);
1861                 } else {
1862                         struct snd_timer_read *r = &tu->queue[0];
1863                         r->resolution = 0;
1864                         r->ticks = 0;
1865                         tu->qused++;
1866                         tu->qtail++;
1867                 }
1868         }
1869         tu->filter = params.filter;
1870         tu->ticks = params.ticks;
1871         spin_unlock_irq(&tu->qlock);
1872         err = 0;
1873  _end:
1874         if (copy_to_user(_params, &params, sizeof(params)))
1875                 return -EFAULT;
1876         return err;
1877 }
1878
1879 static int snd_timer_user_status(struct file *file,
1880                                  struct snd_timer_status __user *_status)
1881 {
1882         struct snd_timer_user *tu;
1883         struct snd_timer_status status;
1884
1885         tu = file->private_data;
1886         if (!tu->timeri)
1887                 return -EBADFD;
1888         memset(&status, 0, sizeof(status));
1889         status.tstamp = tu->tstamp;
1890         status.resolution = snd_timer_resolution(tu->timeri);
1891         status.lost = tu->timeri->lost;
1892         status.overrun = tu->overrun;
1893         spin_lock_irq(&tu->qlock);
1894         status.queue = tu->qused;
1895         spin_unlock_irq(&tu->qlock);
1896         if (copy_to_user(_status, &status, sizeof(status)))
1897                 return -EFAULT;
1898         return 0;
1899 }
1900
1901 static int snd_timer_user_start(struct file *file)
1902 {
1903         int err;
1904         struct snd_timer_user *tu;
1905
1906         tu = file->private_data;
1907         if (!tu->timeri)
1908                 return -EBADFD;
1909         snd_timer_stop(tu->timeri);
1910         tu->timeri->lost = 0;
1911         tu->last_resolution = 0;
1912         err = snd_timer_start(tu->timeri, tu->ticks);
1913         if (err < 0)
1914                 return err;
1915         return 0;
1916 }
1917
1918 static int snd_timer_user_stop(struct file *file)
1919 {
1920         int err;
1921         struct snd_timer_user *tu;
1922
1923         tu = file->private_data;
1924         if (!tu->timeri)
1925                 return -EBADFD;
1926         err = snd_timer_stop(tu->timeri);
1927         if (err < 0)
1928                 return err;
1929         return 0;
1930 }
1931
1932 static int snd_timer_user_continue(struct file *file)
1933 {
1934         int err;
1935         struct snd_timer_user *tu;
1936
1937         tu = file->private_data;
1938         if (!tu->timeri)
1939                 return -EBADFD;
1940         /* start timer instead of continue if it's not used before */
1941         if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1942                 return snd_timer_user_start(file);
1943         tu->timeri->lost = 0;
1944         err = snd_timer_continue(tu->timeri);
1945         if (err < 0)
1946                 return err;
1947         return 0;
1948 }
1949
1950 static int snd_timer_user_pause(struct file *file)
1951 {
1952         int err;
1953         struct snd_timer_user *tu;
1954
1955         tu = file->private_data;
1956         if (!tu->timeri)
1957                 return -EBADFD;
1958         err = snd_timer_pause(tu->timeri);
1959         if (err < 0)
1960                 return err;
1961         return 0;
1962 }
1963
1964 enum {
1965         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1966         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1967         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1968         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1969 };
1970
1971 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1972                                  unsigned long arg)
1973 {
1974         struct snd_timer_user *tu;
1975         void __user *argp = (void __user *)arg;
1976         int __user *p = argp;
1977
1978         tu = file->private_data;
1979         switch (cmd) {
1980         case SNDRV_TIMER_IOCTL_PVERSION:
1981                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1982         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1983                 return snd_timer_user_next_device(argp);
1984         case SNDRV_TIMER_IOCTL_TREAD:
1985         {
1986                 int xarg, old_tread;
1987
1988                 if (tu->timeri) /* too late */
1989                         return -EBUSY;
1990                 if (get_user(xarg, p))
1991                         return -EFAULT;
1992                 old_tread = tu->tread;
1993                 tu->tread = xarg ? 1 : 0;
1994                 if (tu->tread != old_tread &&
1995                     realloc_user_queue(tu, tu->queue_size) < 0) {
1996                         tu->tread = old_tread;
1997                         return -ENOMEM;
1998                 }
1999                 return 0;
2000         }
2001         case SNDRV_TIMER_IOCTL_GINFO:
2002                 return snd_timer_user_ginfo(file, argp);
2003         case SNDRV_TIMER_IOCTL_GPARAMS:
2004                 return snd_timer_user_gparams(file, argp);
2005         case SNDRV_TIMER_IOCTL_GSTATUS:
2006                 return snd_timer_user_gstatus(file, argp);
2007         case SNDRV_TIMER_IOCTL_SELECT:
2008                 return snd_timer_user_tselect(file, argp);
2009         case SNDRV_TIMER_IOCTL_INFO:
2010                 return snd_timer_user_info(file, argp);
2011         case SNDRV_TIMER_IOCTL_PARAMS:
2012                 return snd_timer_user_params(file, argp);
2013         case SNDRV_TIMER_IOCTL_STATUS:
2014                 return snd_timer_user_status(file, argp);
2015         case SNDRV_TIMER_IOCTL_START:
2016         case SNDRV_TIMER_IOCTL_START_OLD:
2017                 return snd_timer_user_start(file);
2018         case SNDRV_TIMER_IOCTL_STOP:
2019         case SNDRV_TIMER_IOCTL_STOP_OLD:
2020                 return snd_timer_user_stop(file);
2021         case SNDRV_TIMER_IOCTL_CONTINUE:
2022         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
2023                 return snd_timer_user_continue(file);
2024         case SNDRV_TIMER_IOCTL_PAUSE:
2025         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
2026                 return snd_timer_user_pause(file);
2027         }
2028         return -ENOTTY;
2029 }
2030
2031 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2032                                  unsigned long arg)
2033 {
2034         struct snd_timer_user *tu = file->private_data;
2035         long ret;
2036
2037         mutex_lock(&tu->ioctl_lock);
2038         ret = __snd_timer_user_ioctl(file, cmd, arg);
2039         mutex_unlock(&tu->ioctl_lock);
2040         return ret;
2041 }
2042
2043 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2044 {
2045         struct snd_timer_user *tu;
2046
2047         tu = file->private_data;
2048         return fasync_helper(fd, file, on, &tu->fasync);
2049 }
2050
2051 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2052                                    size_t count, loff_t *offset)
2053 {
2054         struct snd_timer_user *tu;
2055         long result = 0, unit;
2056         int qhead;
2057         int err = 0;
2058
2059         tu = file->private_data;
2060         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2061         mutex_lock(&tu->ioctl_lock);
2062         spin_lock_irq(&tu->qlock);
2063         while ((long)count - result >= unit) {
2064                 while (!tu->qused) {
2065                         wait_queue_entry_t wait;
2066
2067                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2068                                 err = -EAGAIN;
2069                                 goto _error;
2070                         }
2071
2072                         set_current_state(TASK_INTERRUPTIBLE);
2073                         init_waitqueue_entry(&wait, current);
2074                         add_wait_queue(&tu->qchange_sleep, &wait);
2075
2076                         spin_unlock_irq(&tu->qlock);
2077                         mutex_unlock(&tu->ioctl_lock);
2078                         schedule();
2079                         mutex_lock(&tu->ioctl_lock);
2080                         spin_lock_irq(&tu->qlock);
2081
2082                         remove_wait_queue(&tu->qchange_sleep, &wait);
2083
2084                         if (tu->disconnected) {
2085                                 err = -ENODEV;
2086                                 goto _error;
2087                         }
2088                         if (signal_pending(current)) {
2089                                 err = -ERESTARTSYS;
2090                                 goto _error;
2091                         }
2092                 }
2093
2094                 qhead = tu->qhead++;
2095                 tu->qhead %= tu->queue_size;
2096                 tu->qused--;
2097                 spin_unlock_irq(&tu->qlock);
2098
2099                 if (tu->tread) {
2100                         if (copy_to_user(buffer, &tu->tqueue[qhead],
2101                                          sizeof(struct snd_timer_tread)))
2102                                 err = -EFAULT;
2103                 } else {
2104                         if (copy_to_user(buffer, &tu->queue[qhead],
2105                                          sizeof(struct snd_timer_read)))
2106                                 err = -EFAULT;
2107                 }
2108
2109                 spin_lock_irq(&tu->qlock);
2110                 if (err < 0)
2111                         goto _error;
2112                 result += unit;
2113                 buffer += unit;
2114         }
2115  _error:
2116         spin_unlock_irq(&tu->qlock);
2117         mutex_unlock(&tu->ioctl_lock);
2118         return result > 0 ? result : err;
2119 }
2120
2121 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2122 {
2123         __poll_t mask;
2124         struct snd_timer_user *tu;
2125
2126         tu = file->private_data;
2127
2128         poll_wait(file, &tu->qchange_sleep, wait);
2129
2130         mask = 0;
2131         spin_lock_irq(&tu->qlock);
2132         if (tu->qused)
2133                 mask |= EPOLLIN | EPOLLRDNORM;
2134         if (tu->disconnected)
2135                 mask |= EPOLLERR;
2136         spin_unlock_irq(&tu->qlock);
2137
2138         return mask;
2139 }
2140
2141 #ifdef CONFIG_COMPAT
2142 #include "timer_compat.c"
2143 #else
2144 #define snd_timer_user_ioctl_compat     NULL
2145 #endif
2146
2147 static const struct file_operations snd_timer_f_ops =
2148 {
2149         .owner =        THIS_MODULE,
2150         .read =         snd_timer_user_read,
2151         .open =         snd_timer_user_open,
2152         .release =      snd_timer_user_release,
2153         .llseek =       no_llseek,
2154         .poll =         snd_timer_user_poll,
2155         .unlocked_ioctl =       snd_timer_user_ioctl,
2156         .compat_ioctl = snd_timer_user_ioctl_compat,
2157         .fasync =       snd_timer_user_fasync,
2158 };
2159
2160 /* unregister the system timer */
2161 static void snd_timer_free_all(void)
2162 {
2163         struct snd_timer *timer, *n;
2164
2165         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2166                 snd_timer_free(timer);
2167 }
2168
2169 static struct device timer_dev;
2170
2171 /*
2172  *  ENTRY functions
2173  */
2174
2175 static int __init alsa_timer_init(void)
2176 {
2177         int err;
2178
2179         snd_device_initialize(&timer_dev, NULL);
2180         dev_set_name(&timer_dev, "timer");
2181
2182 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2183         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2184                               "system timer");
2185 #endif
2186
2187         err = snd_timer_register_system();
2188         if (err < 0) {
2189                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2190                 goto put_timer;
2191         }
2192
2193         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2194                                   &snd_timer_f_ops, NULL, &timer_dev);
2195         if (err < 0) {
2196                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2197                 snd_timer_free_all();
2198                 goto put_timer;
2199         }
2200
2201         snd_timer_proc_init();
2202         return 0;
2203
2204 put_timer:
2205         put_device(&timer_dev);
2206         return err;
2207 }
2208
2209 static void __exit alsa_timer_exit(void)
2210 {
2211         snd_unregister_device(&timer_dev);
2212         snd_timer_free_all();
2213         put_device(&timer_dev);
2214         snd_timer_proc_done();
2215 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2216         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2217 #endif
2218 }
2219
2220 module_init(alsa_timer_init)
2221 module_exit(alsa_timer_exit)