git.oblomov.eu Git - linux-2.6/blob - sound/core/timer.c

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