SAFE public projects git trees. - safe/jmp/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 /*
1056  *  Info interface
1057  */
1058
1059 static void snd_timer_proc_read(struct snd_info_entry *entry,
1060                                 struct snd_info_buffer *buffer)
1061 {
1062         unsigned long flags;
1063         struct snd_timer *timer;
1064         struct snd_timer_instance *ti;
1065         struct list_head *p, *q;
1066
1067         down(&register_mutex);
1068         list_for_each(p, &snd_timer_list) {
1069                 timer = list_entry(p, struct snd_timer, device_list);
1070                 switch (timer->tmr_class) {
1071                 case SNDRV_TIMER_CLASS_GLOBAL:
1072                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1073                         break;
1074                 case SNDRV_TIMER_CLASS_CARD:
1075                         snd_iprintf(buffer, "C%i-%i: ",
1076                                     timer->card->number, timer->tmr_device);
1077                         break;
1078                 case SNDRV_TIMER_CLASS_PCM:
1079                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1080                                     timer->tmr_device, timer->tmr_subdevice);
1081                         break;
1082                 default:
1083                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1084                                     timer->card ? timer->card->number : -1,
1085                                     timer->tmr_device, timer->tmr_subdevice);
1086                 }
1087                 snd_iprintf(buffer, "%s :", timer->name);
1088                 if (timer->hw.resolution)
1089                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1090                                     timer->hw.resolution / 1000,
1091                                     timer->hw.resolution % 1000,
1092                                     timer->hw.ticks);
1093                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1094                         snd_iprintf(buffer, " SLAVE");
1095                 snd_iprintf(buffer, "\n");
1096                 spin_lock_irqsave(&timer->lock, flags);
1097                 list_for_each(q, &timer->open_list_head) {
1098                         ti = list_entry(q, struct snd_timer_instance, open_list);
1099                         snd_iprintf(buffer, "  Client %s : %s\n",
1100                                     ti->owner ? ti->owner : "unknown",
1101                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1102                                                  SNDRV_TIMER_IFLG_RUNNING)
1103                                     ? "running" : "stopped");
1104                 }
1105                 spin_unlock_irqrestore(&timer->lock, flags);
1106         }
1107         up(&register_mutex);
1108 }
1109
1110 /*
1111  *  USER SPACE interface
1112  */
1113
1114 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1115                                      unsigned long resolution,
1116                                      unsigned long ticks)
1117 {
1118         struct snd_timer_user *tu = timeri->callback_data;
1119         struct snd_timer_read *r;
1120         int prev;
1121
1122         spin_lock(&tu->qlock);
1123         if (tu->qused > 0) {
1124                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1125                 r = &tu->queue[prev];
1126                 if (r->resolution == resolution) {
1127                         r->ticks += ticks;
1128                         goto __wake;
1129                 }
1130         }
1131         if (tu->qused >= tu->queue_size) {
1132                 tu->overrun++;
1133         } else {
1134                 r = &tu->queue[tu->qtail++];
1135                 tu->qtail %= tu->queue_size;
1136                 r->resolution = resolution;
1137                 r->ticks = ticks;
1138                 tu->qused++;
1139         }
1140       __wake:
1141         spin_unlock(&tu->qlock);
1142         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1143         wake_up(&tu->qchange_sleep);
1144 }
1145
1146 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1147                                             struct snd_timer_tread *tread)
1148 {
1149         if (tu->qused >= tu->queue_size) {
1150                 tu->overrun++;
1151         } else {
1152                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1153                 tu->qtail %= tu->queue_size;
1154                 tu->qused++;
1155         }
1156 }
1157
1158 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1159                                      int event,
1160                                      struct timespec *tstamp,
1161                                      unsigned long resolution)
1162 {
1163         struct snd_timer_user *tu = timeri->callback_data;
1164         struct snd_timer_tread r1;
1165
1166         if (event >= SNDRV_TIMER_EVENT_START &&
1167             event <= SNDRV_TIMER_EVENT_PAUSE)
1168                 tu->tstamp = *tstamp;
1169         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1170                 return;
1171         r1.event = event;
1172         r1.tstamp = *tstamp;
1173         r1.val = resolution;
1174         spin_lock(&tu->qlock);
1175         snd_timer_user_append_to_tqueue(tu, &r1);
1176         spin_unlock(&tu->qlock);
1177         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1178         wake_up(&tu->qchange_sleep);
1179 }
1180
1181 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1182                                       unsigned long resolution,
1183                                       unsigned long ticks)
1184 {
1185         struct snd_timer_user *tu = timeri->callback_data;
1186         struct snd_timer_tread *r, r1;
1187         struct timespec tstamp;
1188         int prev, append = 0;
1189
1190         memset(&tstamp, 0, sizeof(tstamp));
1191         spin_lock(&tu->qlock);
1192         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1193                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1194                 spin_unlock(&tu->qlock);
1195                 return;
1196         }
1197         if (tu->last_resolution != resolution || ticks > 0)
1198                 getnstimeofday(&tstamp);
1199         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1200             tu->last_resolution != resolution) {
1201                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1202                 r1.tstamp = tstamp;
1203                 r1.val = resolution;
1204                 snd_timer_user_append_to_tqueue(tu, &r1);
1205                 tu->last_resolution = resolution;
1206                 append++;
1207         }
1208         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1209                 goto __wake;
1210         if (ticks == 0)
1211                 goto __wake;
1212         if (tu->qused > 0) {
1213                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1214                 r = &tu->tqueue[prev];
1215                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1216                         r->tstamp = tstamp;
1217                         r->val += ticks;
1218                         append++;
1219                         goto __wake;
1220                 }
1221         }
1222         r1.event = SNDRV_TIMER_EVENT_TICK;
1223         r1.tstamp = tstamp;
1224         r1.val = ticks;
1225         snd_timer_user_append_to_tqueue(tu, &r1);
1226         append++;
1227       __wake:
1228         spin_unlock(&tu->qlock);
1229         if (append == 0)
1230                 return;
1231         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1232         wake_up(&tu->qchange_sleep);
1233 }
1234
1235 static int snd_timer_user_open(struct inode *inode, struct file *file)
1236 {
1237         struct snd_timer_user *tu;
1238
1239         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1240         if (tu == NULL)
1241                 return -ENOMEM;
1242         spin_lock_init(&tu->qlock);
1243         init_waitqueue_head(&tu->qchange_sleep);
1244         init_MUTEX(&tu->tread_sem);
1245         tu->ticks = 1;
1246         tu->queue_size = 128;
1247         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1248                             GFP_KERNEL);
1249         if (tu->queue == NULL) {
1250                 kfree(tu);
1251                 return -ENOMEM;
1252         }
1253         file->private_data = tu;
1254         return 0;
1255 }
1256
1257 static int snd_timer_user_release(struct inode *inode, struct file *file)
1258 {
1259         struct snd_timer_user *tu;
1260
1261         if (file->private_data) {
1262                 tu = file->private_data;
1263                 file->private_data = NULL;
1264                 fasync_helper(-1, file, 0, &tu->fasync);
1265                 if (tu->timeri)
1266                         snd_timer_close(tu->timeri);
1267                 kfree(tu->queue);
1268                 kfree(tu->tqueue);
1269                 kfree(tu);
1270         }
1271         return 0;
1272 }
1273
1274 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1275 {
1276         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1277         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1278         id->card = -1;
1279         id->device = -1;
1280         id->subdevice = -1;
1281 }
1282
1283 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1284 {
1285         id->dev_class = timer->tmr_class;
1286         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1287         id->card = timer->card ? timer->card->number : -1;
1288         id->device = timer->tmr_device;
1289         id->subdevice = timer->tmr_subdevice;
1290 }
1291
1292 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1293 {
1294         struct snd_timer_id id;
1295         struct snd_timer *timer;
1296         struct list_head *p;
1297
1298         if (copy_from_user(&id, _tid, sizeof(id)))
1299                 return -EFAULT;
1300         down(&register_mutex);
1301         if (id.dev_class < 0) {         /* first item */
1302                 if (list_empty(&snd_timer_list))
1303                         snd_timer_user_zero_id(&id);
1304                 else {
1305                         timer = list_entry(snd_timer_list.next,
1306                                            struct snd_timer, device_list);
1307                         snd_timer_user_copy_id(&id, timer);
1308                 }
1309         } else {
1310                 switch (id.dev_class) {
1311                 case SNDRV_TIMER_CLASS_GLOBAL:
1312                         id.device = id.device < 0 ? 0 : id.device + 1;
1313                         list_for_each(p, &snd_timer_list) {
1314                                 timer = list_entry(p, struct snd_timer, device_list);
1315                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1316                                         snd_timer_user_copy_id(&id, timer);
1317                                         break;
1318                                 }
1319                                 if (timer->tmr_device >= id.device) {
1320                                         snd_timer_user_copy_id(&id, timer);
1321                                         break;
1322                                 }
1323                         }
1324                         if (p == &snd_timer_list)
1325                                 snd_timer_user_zero_id(&id);
1326                         break;
1327                 case SNDRV_TIMER_CLASS_CARD:
1328                 case SNDRV_TIMER_CLASS_PCM:
1329                         if (id.card < 0) {
1330                                 id.card = 0;
1331                         } else {
1332                                 if (id.card < 0) {
1333                                         id.card = 0;
1334                                 } else {
1335                                         if (id.device < 0) {
1336                                                 id.device = 0;
1337                                         } else {
1338                                                 if (id.subdevice < 0) {
1339                                                         id.subdevice = 0;
1340                                                 } else {
1341                                                         id.subdevice++;
1342                                                 }
1343                                         }
1344                                 }
1345                         }
1346                         list_for_each(p, &snd_timer_list) {
1347                                 timer = list_entry(p, struct snd_timer, device_list);
1348                                 if (timer->tmr_class > id.dev_class) {
1349                                         snd_timer_user_copy_id(&id, timer);
1350                                         break;
1351                                 }
1352                                 if (timer->tmr_class < id.dev_class)
1353                                         continue;
1354                                 if (timer->card->number > id.card) {
1355                                         snd_timer_user_copy_id(&id, timer);
1356                                         break;
1357                                 }
1358                                 if (timer->card->number < id.card)
1359                                         continue;
1360                                 if (timer->tmr_device > id.device) {
1361                                         snd_timer_user_copy_id(&id, timer);
1362                                         break;
1363                                 }
1364                                 if (timer->tmr_device < id.device)
1365                                         continue;
1366                                 if (timer->tmr_subdevice > id.subdevice) {
1367                                         snd_timer_user_copy_id(&id, timer);
1368                                         break;
1369                                 }
1370                                 if (timer->tmr_subdevice < id.subdevice)
1371                                         continue;
1372                                 snd_timer_user_copy_id(&id, timer);
1373                                 break;
1374                         }
1375                         if (p == &snd_timer_list)
1376                                 snd_timer_user_zero_id(&id);
1377                         break;
1378                 default:
1379                         snd_timer_user_zero_id(&id);
1380                 }
1381         }
1382         up(&register_mutex);
1383         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1384                 return -EFAULT;
1385         return 0;
1386 }
1387
1388 static int snd_timer_user_ginfo(struct file *file,
1389                                 struct snd_timer_ginfo __user *_ginfo)
1390 {
1391         struct snd_timer_ginfo *ginfo;
1392         struct snd_timer_id tid;
1393         struct snd_timer *t;
1394         struct list_head *p;
1395         int err = 0;
1396
1397         ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1398         if (! ginfo)
1399                 return -ENOMEM;
1400         if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1401                 kfree(ginfo);
1402                 return -EFAULT;
1403         }
1404         tid = ginfo->tid;
1405         memset(ginfo, 0, sizeof(*ginfo));
1406         ginfo->tid = tid;
1407         down(&register_mutex);
1408         t = snd_timer_find(&tid);
1409         if (t != NULL) {
1410                 ginfo->card = t->card ? t->card->number : -1;
1411                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1412                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1413                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1414                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1415                 ginfo->resolution = t->hw.resolution;
1416                 if (t->hw.resolution_min > 0) {
1417                         ginfo->resolution_min = t->hw.resolution_min;
1418                         ginfo->resolution_max = t->hw.resolution_max;
1419                 }
1420                 list_for_each(p, &t->open_list_head) {
1421                         ginfo->clients++;
1422                 }
1423         } else {
1424                 err = -ENODEV;
1425         }
1426         up(&register_mutex);
1427         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1428                 err = -EFAULT;
1429         kfree(ginfo);
1430         return err;
1431 }
1432
1433 static int snd_timer_user_gparams(struct file *file,
1434                                   struct snd_timer_gparams __user *_gparams)
1435 {
1436         struct snd_timer_gparams gparams;
1437         struct snd_timer *t;
1438         int err;
1439
1440         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1441                 return -EFAULT;
1442         down(&register_mutex);
1443         t = snd_timer_find(&gparams.tid);
1444         if (!t) {
1445                 err = -ENODEV;
1446                 goto _error;
1447         }
1448         if (!list_empty(&t->open_list_head)) {
1449                 err = -EBUSY;
1450                 goto _error;
1451         }
1452         if (!t->hw.set_period) {
1453                 err = -ENOSYS;
1454                 goto _error;
1455         }
1456         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1457 _error:
1458         up(&register_mutex);
1459         return err;
1460 }
1461
1462 static int snd_timer_user_gstatus(struct file *file,
1463                                   struct snd_timer_gstatus __user *_gstatus)
1464 {
1465         struct snd_timer_gstatus gstatus;
1466         struct snd_timer_id tid;
1467         struct snd_timer *t;
1468         int err = 0;
1469
1470         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1471                 return -EFAULT;
1472         tid = gstatus.tid;
1473         memset(&gstatus, 0, sizeof(gstatus));
1474         gstatus.tid = tid;
1475         down(&register_mutex);
1476         t = snd_timer_find(&tid);
1477         if (t != NULL) {
1478                 if (t->hw.c_resolution)
1479                         gstatus.resolution = t->hw.c_resolution(t);
1480                 else
1481                         gstatus.resolution = t->hw.resolution;
1482                 if (t->hw.precise_resolution) {
1483                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1484                                                  &gstatus.resolution_den);
1485                 } else {
1486                         gstatus.resolution_num = gstatus.resolution;
1487                         gstatus.resolution_den = 1000000000uL;
1488                 }
1489         } else {
1490                 err = -ENODEV;
1491         }
1492         up(&register_mutex);
1493         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1494                 err = -EFAULT;
1495         return err;
1496 }
1497
1498 static int snd_timer_user_tselect(struct file *file,
1499                                   struct snd_timer_select __user *_tselect)
1500 {
1501         struct snd_timer_user *tu;
1502         struct snd_timer_select tselect;
1503         char str[32];
1504         int err = 0;
1505
1506         tu = file->private_data;
1507         down(&tu->tread_sem);
1508         if (tu->timeri) {
1509                 snd_timer_close(tu->timeri);
1510                 tu->timeri = NULL;
1511         }
1512         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1513                 err = -EFAULT;
1514                 goto __err;
1515         }
1516         sprintf(str, "application %i", current->pid);
1517         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1518                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1519         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1520         if (err < 0)
1521                 goto __err;
1522
1523         kfree(tu->queue);
1524         tu->queue = NULL;
1525         kfree(tu->tqueue);
1526         tu->tqueue = NULL;
1527         if (tu->tread) {
1528                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1529                                      GFP_KERNEL);
1530                 if (tu->tqueue == NULL)
1531                         err = -ENOMEM;
1532         } else {
1533                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1534                                     GFP_KERNEL);
1535                 if (tu->queue == NULL)
1536                         err = -ENOMEM;
1537         }
1538
1539         if (err < 0) {
1540                 snd_timer_close(tu->timeri);
1541                 tu->timeri = NULL;
1542         } else {
1543                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1544                 tu->timeri->callback = tu->tread
1545                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1546                 tu->timeri->ccallback = snd_timer_user_ccallback;
1547                 tu->timeri->callback_data = (void *)tu;
1548         }
1549
1550       __err:
1551         up(&tu->tread_sem);
1552         return err;
1553 }
1554
1555 static int snd_timer_user_info(struct file *file,
1556                                struct snd_timer_info __user *_info)
1557 {
1558         struct snd_timer_user *tu;
1559         struct snd_timer_info *info;
1560         struct snd_timer *t;
1561         int err = 0;
1562
1563         tu = file->private_data;
1564         snd_assert(tu->timeri != NULL, return -ENXIO);
1565         t = tu->timeri->timer;
1566         snd_assert(t != NULL, return -ENXIO);
1567
1568         info = kzalloc(sizeof(*info), GFP_KERNEL);
1569         if (! info)
1570                 return -ENOMEM;
1571         info->card = t->card ? t->card->number : -1;
1572         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1573                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1574         strlcpy(info->id, t->id, sizeof(info->id));
1575         strlcpy(info->name, t->name, sizeof(info->name));
1576         info->resolution = t->hw.resolution;
1577         if (copy_to_user(_info, info, sizeof(*_info)))
1578                 err = -EFAULT;
1579         kfree(info);
1580         return err;
1581 }
1582
1583 static int snd_timer_user_params(struct file *file,
1584                                  struct snd_timer_params __user *_params)
1585 {
1586         struct snd_timer_user *tu;
1587         struct snd_timer_params params;
1588         struct snd_timer *t;
1589         struct snd_timer_read *tr;
1590         struct snd_timer_tread *ttr;
1591         int err;
1592
1593         tu = file->private_data;
1594         snd_assert(tu->timeri != NULL, return -ENXIO);
1595         t = tu->timeri->timer;
1596         snd_assert(t != NULL, return -ENXIO);
1597         if (copy_from_user(&params, _params, sizeof(params)))
1598                 return -EFAULT;
1599         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1600                 err = -EINVAL;
1601                 goto _end;
1602         }
1603         if (params.queue_size > 0 &&
1604             (params.queue_size < 32 || params.queue_size > 1024)) {
1605                 err = -EINVAL;
1606                 goto _end;
1607         }
1608         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1609                               (1<<SNDRV_TIMER_EVENT_TICK)|
1610                               (1<<SNDRV_TIMER_EVENT_START)|
1611                               (1<<SNDRV_TIMER_EVENT_STOP)|
1612                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1613                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1614                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1615                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1616                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1617                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1618                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1619                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1620                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1621                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1622                 err = -EINVAL;
1623                 goto _end;
1624         }
1625         snd_timer_stop(tu->timeri);
1626         spin_lock_irq(&t->lock);
1627         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1628                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1629                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1630         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1631                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1632         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1633                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1634         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1635                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1636         spin_unlock_irq(&t->lock);
1637         if (params.queue_size > 0 &&
1638             (unsigned int)tu->queue_size != params.queue_size) {
1639                 if (tu->tread) {
1640                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1641                                       GFP_KERNEL);
1642                         if (ttr) {
1643                                 kfree(tu->tqueue);
1644                                 tu->queue_size = params.queue_size;
1645                                 tu->tqueue = ttr;
1646                         }
1647                 } else {
1648                         tr = kmalloc(params.queue_size * sizeof(*tr),
1649                                      GFP_KERNEL);
1650                         if (tr) {
1651                                 kfree(tu->queue);
1652                                 tu->queue_size = params.queue_size;
1653                                 tu->queue = tr;
1654                         }
1655                 }
1656         }
1657         tu->qhead = tu->qtail = tu->qused = 0;
1658         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1659                 if (tu->tread) {
1660                         struct snd_timer_tread tread;
1661                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1662                         tread.tstamp.tv_sec = 0;
1663                         tread.tstamp.tv_nsec = 0;
1664                         tread.val = 0;
1665                         snd_timer_user_append_to_tqueue(tu, &tread);
1666                 } else {
1667                         struct snd_timer_read *r = &tu->queue[0];
1668                         r->resolution = 0;
1669                         r->ticks = 0;
1670                         tu->qused++;
1671                         tu->qtail++;
1672                 }
1673         }
1674         tu->filter = params.filter;
1675         tu->ticks = params.ticks;
1676         err = 0;
1677  _end:
1678         if (copy_to_user(_params, &params, sizeof(params)))
1679                 return -EFAULT;
1680         return err;
1681 }
1682
1683 static int snd_timer_user_status(struct file *file,
1684                                  struct snd_timer_status __user *_status)
1685 {
1686         struct snd_timer_user *tu;
1687         struct snd_timer_status status;
1688
1689         tu = file->private_data;
1690         snd_assert(tu->timeri != NULL, return -ENXIO);
1691         memset(&status, 0, sizeof(status));
1692         status.tstamp = tu->tstamp;
1693         status.resolution = snd_timer_resolution(tu->timeri);
1694         status.lost = tu->timeri->lost;
1695         status.overrun = tu->overrun;
1696         spin_lock_irq(&tu->qlock);
1697         status.queue = tu->qused;
1698         spin_unlock_irq(&tu->qlock);
1699         if (copy_to_user(_status, &status, sizeof(status)))
1700                 return -EFAULT;
1701         return 0;
1702 }
1703
1704 static int snd_timer_user_start(struct file *file)
1705 {
1706         int err;
1707         struct snd_timer_user *tu;
1708
1709         tu = file->private_data;
1710         snd_assert(tu->timeri != NULL, return -ENXIO);
1711         snd_timer_stop(tu->timeri);
1712         tu->timeri->lost = 0;
1713         tu->last_resolution = 0;
1714         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1715 }
1716
1717 static int snd_timer_user_stop(struct file *file)
1718 {
1719         int err;
1720         struct snd_timer_user *tu;
1721
1722         tu = file->private_data;
1723         snd_assert(tu->timeri != NULL, return -ENXIO);
1724         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1725 }
1726
1727 static int snd_timer_user_continue(struct file *file)
1728 {
1729         int err;
1730         struct snd_timer_user *tu;
1731
1732         tu = file->private_data;
1733         snd_assert(tu->timeri != NULL, return -ENXIO);
1734         tu->timeri->lost = 0;
1735         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1736 }
1737
1738 static int snd_timer_user_pause(struct file *file)
1739 {
1740         int err;
1741         struct snd_timer_user *tu;
1742
1743         tu = file->private_data;
1744         snd_assert(tu->timeri != NULL, return -ENXIO);
1745         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1746 }
1747
1748 enum {
1749         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1750         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1751         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1752         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1753 };
1754
1755 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1756                                  unsigned long arg)
1757 {
1758         struct snd_timer_user *tu;
1759         void __user *argp = (void __user *)arg;
1760         int __user *p = argp;
1761
1762         tu = file->private_data;
1763         switch (cmd) {
1764         case SNDRV_TIMER_IOCTL_PVERSION:
1765                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1766         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1767                 return snd_timer_user_next_device(argp);
1768         case SNDRV_TIMER_IOCTL_TREAD:
1769         {
1770                 int xarg;
1771
1772                 down(&tu->tread_sem);
1773                 if (tu->timeri) {       /* too late */
1774                         up(&tu->tread_sem);
1775                         return -EBUSY;
1776                 }
1777                 if (get_user(xarg, p)) {
1778                         up(&tu->tread_sem);
1779                         return -EFAULT;
1780                 }
1781                 tu->tread = xarg ? 1 : 0;
1782                 up(&tu->tread_sem);
1783                 return 0;
1784         }
1785         case SNDRV_TIMER_IOCTL_GINFO:
1786                 return snd_timer_user_ginfo(file, argp);
1787         case SNDRV_TIMER_IOCTL_GPARAMS:
1788                 return snd_timer_user_gparams(file, argp);
1789         case SNDRV_TIMER_IOCTL_GSTATUS:
1790                 return snd_timer_user_gstatus(file, argp);
1791         case SNDRV_TIMER_IOCTL_SELECT:
1792                 return snd_timer_user_tselect(file, argp);
1793         case SNDRV_TIMER_IOCTL_INFO:
1794                 return snd_timer_user_info(file, argp);
1795         case SNDRV_TIMER_IOCTL_PARAMS:
1796                 return snd_timer_user_params(file, argp);
1797         case SNDRV_TIMER_IOCTL_STATUS:
1798                 return snd_timer_user_status(file, argp);
1799         case SNDRV_TIMER_IOCTL_START:
1800         case SNDRV_TIMER_IOCTL_START_OLD:
1801                 return snd_timer_user_start(file);
1802         case SNDRV_TIMER_IOCTL_STOP:
1803         case SNDRV_TIMER_IOCTL_STOP_OLD:
1804                 return snd_timer_user_stop(file);
1805         case SNDRV_TIMER_IOCTL_CONTINUE:
1806         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1807                 return snd_timer_user_continue(file);
1808         case SNDRV_TIMER_IOCTL_PAUSE:
1809         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1810                 return snd_timer_user_pause(file);
1811         }
1812         return -ENOTTY;
1813 }
1814
1815 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1816 {
1817         struct snd_timer_user *tu;
1818         int err;
1819
1820         tu = file->private_data;
1821         err = fasync_helper(fd, file, on, &tu->fasync);
1822         if (err < 0)
1823                 return err;
1824         return 0;
1825 }
1826
1827 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1828                                    size_t count, loff_t *offset)
1829 {
1830         struct snd_timer_user *tu;
1831         long result = 0, unit;
1832         int err = 0;
1833
1834         tu = file->private_data;
1835         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1836         spin_lock_irq(&tu->qlock);
1837         while ((long)count - result >= unit) {
1838                 while (!tu->qused) {
1839                         wait_queue_t wait;
1840
1841                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1842                                 err = -EAGAIN;
1843                                 break;
1844                         }
1845
1846                         set_current_state(TASK_INTERRUPTIBLE);
1847                         init_waitqueue_entry(&wait, current);
1848                         add_wait_queue(&tu->qchange_sleep, &wait);
1849
1850                         spin_unlock_irq(&tu->qlock);
1851                         schedule();
1852                         spin_lock_irq(&tu->qlock);
1853
1854                         remove_wait_queue(&tu->qchange_sleep, &wait);
1855
1856                         if (signal_pending(current)) {
1857                                 err = -ERESTARTSYS;
1858                                 break;
1859                         }
1860                 }
1861
1862                 spin_unlock_irq(&tu->qlock);
1863                 if (err < 0)
1864                         goto _error;
1865
1866                 if (tu->tread) {
1867                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1868                                          sizeof(struct snd_timer_tread))) {
1869                                 err = -EFAULT;
1870                                 goto _error;
1871                         }
1872                 } else {
1873                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1874                                          sizeof(struct snd_timer_read))) {
1875                                 err = -EFAULT;
1876                                 goto _error;
1877                         }
1878                 }
1879
1880                 tu->qhead %= tu->queue_size;
1881
1882                 result += unit;
1883                 buffer += unit;
1884
1885                 spin_lock_irq(&tu->qlock);
1886                 tu->qused--;
1887         }
1888         spin_unlock_irq(&tu->qlock);
1889  _error:
1890         return result > 0 ? result : err;
1891 }
1892
1893 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1894 {
1895         unsigned int mask;
1896         struct snd_timer_user *tu;
1897
1898         tu = file->private_data;
1899
1900         poll_wait(file, &tu->qchange_sleep, wait);
1901
1902         mask = 0;
1903         if (tu->qused)
1904                 mask |= POLLIN | POLLRDNORM;
1905
1906         return mask;
1907 }
1908
1909 #ifdef CONFIG_COMPAT
1910 #include "timer_compat.c"
1911 #else
1912 #define snd_timer_user_ioctl_compat     NULL
1913 #endif
1914
1915 static struct file_operations snd_timer_f_ops =
1916 {
1917         .owner =        THIS_MODULE,
1918         .read =         snd_timer_user_read,
1919         .open =         snd_timer_user_open,
1920         .release =      snd_timer_user_release,
1921         .poll =         snd_timer_user_poll,
1922         .unlocked_ioctl =       snd_timer_user_ioctl,
1923         .compat_ioctl = snd_timer_user_ioctl_compat,
1924         .fasync =       snd_timer_user_fasync,
1925 };
1926
1927 static struct snd_minor snd_timer_reg =
1928 {
1929         .comment =      "timer",
1930         .f_ops =        &snd_timer_f_ops,
1931 };
1932
1933 /*
1934  *  ENTRY functions
1935  */
1936
1937 static struct snd_info_entry *snd_timer_proc_entry = NULL;
1938
1939 static int __init alsa_timer_init(void)
1940 {
1941         int err;
1942         struct snd_info_entry *entry;
1943
1944 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1945         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1946                               "system timer");
1947 #endif
1948         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1949         if (entry != NULL) {
1950                 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1951                 entry->c.text.read = snd_timer_proc_read;
1952                 if (snd_info_register(entry) < 0) {
1953                         snd_info_free_entry(entry);
1954                         entry = NULL;
1955                 }
1956         }
1957         snd_timer_proc_entry = entry;
1958         if ((err = snd_timer_register_system()) < 0)
1959                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1960                            err);
1961         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1962                                         NULL, 0, &snd_timer_reg, "timer"))<0)
1963                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1964                            err);
1965         return 0;
1966 }
1967
1968 static void __exit alsa_timer_exit(void)
1969 {
1970         struct list_head *p, *n;
1971
1972         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1973         /* unregister the system timer */
1974         list_for_each_safe(p, n, &snd_timer_list) {
1975                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1976                 snd_timer_unregister(timer);
1977         }
1978         if (snd_timer_proc_entry) {
1979                 snd_info_unregister(snd_timer_proc_entry);
1980                 snd_timer_proc_entry = NULL;
1981         }
1982 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1983         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1984 #endif
1985 }
1986
1987 module_init(alsa_timer_init)
1988 module_exit(alsa_timer_exit)
1989
1990 EXPORT_SYMBOL(snd_timer_open);
1991 EXPORT_SYMBOL(snd_timer_close);
1992 EXPORT_SYMBOL(snd_timer_resolution);
1993 EXPORT_SYMBOL(snd_timer_start);
1994 EXPORT_SYMBOL(snd_timer_stop);
1995 EXPORT_SYMBOL(snd_timer_continue);
1996 EXPORT_SYMBOL(snd_timer_pause);
1997 EXPORT_SYMBOL(snd_timer_new);
1998 EXPORT_SYMBOL(snd_timer_notify);
1999 EXPORT_SYMBOL(snd_timer_global_new);
2000 EXPORT_SYMBOL(snd_timer_global_free);
2001 EXPORT_SYMBOL(snd_timer_global_register);
2002 EXPORT_SYMBOL(snd_timer_global_unregister);
2003 EXPORT_SYMBOL(snd_timer_interrupt);