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 typedef struct {
  57         snd_timer_instance_t *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         snd_timer_read_t *queue;
  66         snd_timer_tread_t *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 } snd_timer_user_t;
  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(snd_timer_t *timer);
  88 static int snd_timer_dev_free(snd_device_t *device);
  89 static int snd_timer_dev_register(snd_device_t *device);
  90 static int snd_timer_dev_unregister(snd_device_t *device);
  91
  92 static void snd_timer_reschedule(snd_timer_t * 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 snd_timer_instance_t *snd_timer_instance_new(char *owner,
  99                                                     snd_timer_t *timer)
 100 {
 101         snd_timer_instance_t *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 snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
 130 {
 131         snd_timer_t *timer = NULL;
 132         struct list_head *p;
 133
 134         list_for_each(p, &snd_timer_list) {
 135                 timer = list_entry(p, snd_timer_t, 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(snd_timer_id_t *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(snd_timer_instance_t *slave)
 183 {
 184         snd_timer_t *timer;
 185         snd_timer_instance_t *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, snd_timer_t, device_list);
 191                 list_for_each(q, &timer->open_list_head) {
 192                         master = list_entry(q, snd_timer_instance_t, 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(snd_timer_instance_t *master)
 215 {
 216         snd_timer_instance_t *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, snd_timer_instance_t, 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(snd_timer_instance_t **ti,
 242                    char *owner, snd_timer_id_t *tid,
 243                    unsigned int slave_id)
 244 {
 245         snd_timer_t *timer;
 246         snd_timer_instance_t *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                                     snd_timer_instance_t, 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(snd_timer_instance_t * timeri,
 311                            int keep_flag, enum sndrv_timer_event event);
 312
 313 /*
 314  * close a timer instance
 315  */
 316 int snd_timer_close(snd_timer_instance_t * timeri)
 317 {
 318         snd_timer_t *timer = NULL;
 319         struct list_head *p, *n;
 320         snd_timer_instance_t *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, snd_timer_instance_t, 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(snd_timer_instance_t * timeri)
 377 {
 378         snd_timer_t * 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(snd_timer_instance_t *ti,
 391                               enum sndrv_timer_event event)
 392 {
 393         snd_timer_t *timer;
 394         unsigned long flags;
 395         unsigned long resolution = 0;
 396         snd_timer_instance_t *ts;
 397         struct list_head *n;
 398         struct timespec tstamp;
 399
 400         getnstimeofday(&tstamp);
 401         snd_assert(event >= SNDRV_TIMER_EVENT_START &&
 402                    event <= SNDRV_TIMER_EVENT_PAUSE, return);
 403         if (event == SNDRV_TIMER_EVENT_START ||
 404             event == SNDRV_TIMER_EVENT_CONTINUE)
 405                 resolution = snd_timer_resolution(ti);
 406         if (ti->ccallback)
 407                 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
 408         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 409                 return;
 410         timer = ti->timer;
 411         if (timer == NULL)
 412                 return;
 413         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 414                 return;
 415         spin_lock_irqsave(&timer->lock, flags);
 416         list_for_each(n, &ti->slave_active_head) {
 417                 ts = list_entry(n, snd_timer_instance_t, active_list);
 418                 if (ts->ccallback)
 419                         ts->ccallback(ti, event + 100, &tstamp, resolution);
 420         }
 421         spin_unlock_irqrestore(&timer->lock, flags);
 422 }
 423
 424 static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri,
 425                             unsigned long sticks)
 426 {
 427         list_del(&timeri->active_list);
 428         list_add_tail(&timeri->active_list, &timer->active_list_head);
 429         if (timer->running) {
 430                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 431                         goto __start_now;
 432                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 433                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 434                 return 1;       /* delayed start */
 435         } else {
 436                 timer->sticks = sticks;
 437                 timer->hw.start(timer);
 438               __start_now:
 439                 timer->running++;
 440                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 441                 return 0;
 442         }
 443 }
 444
 445 static int snd_timer_start_slave(snd_timer_instance_t *timeri)
 446 {
 447         unsigned long flags;
 448
 449         spin_lock_irqsave(&slave_active_lock, flags);
 450         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 451         if (timeri->master)
 452                 list_add_tail(&timeri->active_list,
 453                               &timeri->master->slave_active_head);
 454         spin_unlock_irqrestore(&slave_active_lock, flags);
 455         return 1; /* delayed start */
 456 }
 457
 458 /*
 459  *  start the timer instance
 460  */
 461 int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks)
 462 {
 463         snd_timer_t *timer;
 464         int result = -EINVAL;
 465         unsigned long flags;
 466
 467         if (timeri == NULL || ticks < 1)
 468                 return -EINVAL;
 469         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 470                 result = snd_timer_start_slave(timeri);
 471                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 472                 return result;
 473         }
 474         timer = timeri->timer;
 475         if (timer == NULL)
 476                 return -EINVAL;
 477         spin_lock_irqsave(&timer->lock, flags);
 478         timeri->ticks = timeri->cticks = ticks;
 479         timeri->pticks = 0;
 480         result = snd_timer_start1(timer, timeri, ticks);
 481         spin_unlock_irqrestore(&timer->lock, flags);
 482         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 483         return result;
 484 }
 485
 486 static int _snd_timer_stop(snd_timer_instance_t * timeri,
 487                            int keep_flag, enum sndrv_timer_event event)
 488 {
 489         snd_timer_t *timer;
 490         unsigned long flags;
 491
 492         snd_assert(timeri != NULL, return -ENXIO);
 493
 494         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 495                 if (!keep_flag) {
 496                         spin_lock_irqsave(&slave_active_lock, flags);
 497                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 498                         spin_unlock_irqrestore(&slave_active_lock, flags);
 499                 }
 500                 goto __end;
 501         }
 502         timer = timeri->timer;
 503         if (!timer)
 504                 return -EINVAL;
 505         spin_lock_irqsave(&timer->lock, flags);
 506         list_del_init(&timeri->ack_list);
 507         list_del_init(&timeri->active_list);
 508         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 509             !(--timer->running)) {
 510                 timer->hw.stop(timer);
 511                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 512                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 513                         snd_timer_reschedule(timer, 0);
 514                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 515                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 516                                 timer->hw.start(timer);
 517                         }
 518                 }
 519         }
 520         if (!keep_flag)
 521                 timeri->flags &=
 522                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 523         spin_unlock_irqrestore(&timer->lock, flags);
 524       __end:
 525         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 526                 snd_timer_notify1(timeri, event);
 527         return 0;
 528 }
 529
 530 /*
 531  * stop the timer instance.
 532  *
 533  * do not call this from the timer callback!
 534  */
 535 int snd_timer_stop(snd_timer_instance_t * timeri)
 536 {
 537         snd_timer_t *timer;
 538         unsigned long flags;
 539         int err;
 540
 541         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
 542         if (err < 0)
 543                 return err;
 544         timer = timeri->timer;
 545         spin_lock_irqsave(&timer->lock, flags);
 546         timeri->cticks = timeri->ticks;
 547         timeri->pticks = 0;
 548         spin_unlock_irqrestore(&timer->lock, flags);
 549         return 0;
 550 }
 551
 552 /*
 553  * start again..  the tick is kept.
 554  */
 555 int snd_timer_continue(snd_timer_instance_t * timeri)
 556 {
 557         snd_timer_t *timer;
 558         int result = -EINVAL;
 559         unsigned long flags;
 560
 561         if (timeri == NULL)
 562                 return result;
 563         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 564                 return snd_timer_start_slave(timeri);
 565         timer = timeri->timer;
 566         if (! timer)
 567                 return -EINVAL;
 568         spin_lock_irqsave(&timer->lock, flags);
 569         if (!timeri->cticks)
 570                 timeri->cticks = 1;
 571         timeri->pticks = 0;
 572         result = snd_timer_start1(timer, timeri, timer->sticks);
 573         spin_unlock_irqrestore(&timer->lock, flags);
 574         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
 575         return result;
 576 }
 577
 578 /*
 579  * pause.. remember the ticks left
 580  */
 581 int snd_timer_pause(snd_timer_instance_t * timeri)
 582 {
 583         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
 584 }
 585
 586 /*
 587  * reschedule the timer
 588  *
 589  * start pending instances and check the scheduling ticks.
 590  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 591  */
 592 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left)
 593 {
 594         snd_timer_instance_t *ti;
 595         unsigned long ticks = ~0UL;
 596         struct list_head *p;
 597
 598         list_for_each(p, &timer->active_list_head) {
 599                 ti = list_entry(p, snd_timer_instance_t, active_list);
 600                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 601                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 602                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 603                         timer->running++;
 604                 }
 605                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 606                         if (ticks > ti->cticks)
 607                                 ticks = ti->cticks;
 608                 }
 609         }
 610         if (ticks == ~0UL) {
 611                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 612                 return;
 613         }
 614         if (ticks > timer->hw.ticks)
 615                 ticks = timer->hw.ticks;
 616         if (ticks_left != ticks)
 617                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 618         timer->sticks = ticks;
 619 }
 620
 621 /*
 622  * timer tasklet
 623  *
 624  */
 625 static void snd_timer_tasklet(unsigned long arg)
 626 {
 627         snd_timer_t *timer = (snd_timer_t *) arg;
 628         snd_timer_instance_t *ti;
 629         struct list_head *p;
 630         unsigned long resolution, ticks;
 631
 632         spin_lock(&timer->lock);
 633         /* now process all callbacks */
 634         while (!list_empty(&timer->sack_list_head)) {
 635                 p = timer->sack_list_head.next;         /* get first item */
 636                 ti = list_entry(p, snd_timer_instance_t, ack_list);
 637
 638                 /* remove from ack_list and make empty */
 639                 list_del_init(p);
 640
 641                 ticks = ti->pticks;
 642                 ti->pticks = 0;
 643                 resolution = ti->resolution;
 644
 645                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 646                 spin_unlock(&timer->lock);
 647                 if (ti->callback)
 648                         ti->callback(ti, resolution, ticks);
 649                 spin_lock(&timer->lock);
 650                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 651         }
 652         spin_unlock(&timer->lock);
 653 }
 654
 655 /*
 656  * timer interrupt
 657  *
 658  * ticks_left is usually equal to timer->sticks.
 659  *
 660  */
 661 void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left)
 662 {
 663         snd_timer_instance_t *ti, *ts;
 664         unsigned long resolution, ticks;
 665         struct list_head *p, *q, *n, *ack_list_head;
 666         int use_tasklet = 0;
 667
 668         if (timer == NULL)
 669                 return;
 670
 671         spin_lock(&timer->lock);
 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, snd_timer_instance_t, 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, snd_timer_instance_t, 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, snd_timer_instance_t, 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(&timer->lock);
 757
 758         if (use_tasklet)
 759                 tasklet_hi_schedule(&timer->task_queue);
 760 }
 761
 762 /*
 763
 764  */
 765
 766 int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid,
 767                   snd_timer_t **rtimer)
 768 {
 769         snd_timer_t *timer;
 770         int err;
 771         static snd_device_ops_t 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                 return -ENOMEM;
 783         timer->tmr_class = tid->dev_class;
 784         timer->card = card;
 785         timer->tmr_device = tid->device;
 786         timer->tmr_subdevice = tid->subdevice;
 787         if (id)
 788                 strlcpy(timer->id, id, sizeof(timer->id));
 789         INIT_LIST_HEAD(&timer->device_list);
 790         INIT_LIST_HEAD(&timer->open_list_head);
 791         INIT_LIST_HEAD(&timer->active_list_head);
 792         INIT_LIST_HEAD(&timer->ack_list_head);
 793         INIT_LIST_HEAD(&timer->sack_list_head);
 794         spin_lock_init(&timer->lock);
 795         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 796                      (unsigned long)timer);
 797         if (card != NULL) {
 798                 timer->module = card->module;
 799                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 800                 if (err < 0) {
 801                         snd_timer_free(timer);
 802                         return err;
 803                 }
 804         }
 805         *rtimer = timer;
 806         return 0;
 807 }
 808
 809 static int snd_timer_free(snd_timer_t *timer)
 810 {
 811         snd_assert(timer != NULL, return -ENXIO);
 812         if (timer->private_free)
 813                 timer->private_free(timer);
 814         kfree(timer);
 815         return 0;
 816 }
 817
 818 static int snd_timer_dev_free(snd_device_t *device)
 819 {
 820         snd_timer_t *timer = device->device_data;
 821         return snd_timer_free(timer);
 822 }
 823
 824 static int snd_timer_dev_register(snd_device_t *dev)
 825 {
 826         snd_timer_t *timer = dev->device_data;
 827         snd_timer_t *timer1;
 828         struct list_head *p;
 829
 830         snd_assert(timer != NULL && timer->hw.start != NULL &&
 831                    timer->hw.stop != NULL, return -ENXIO);
 832         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 833             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 834                 return -EINVAL;
 835
 836         down(&register_mutex);
 837         list_for_each(p, &snd_timer_list) {
 838                 timer1 = list_entry(p, snd_timer_t, device_list);
 839                 if (timer1->tmr_class > timer->tmr_class)
 840                         break;
 841                 if (timer1->tmr_class < timer->tmr_class)
 842                         continue;
 843                 if (timer1->card && timer->card) {
 844                         if (timer1->card->number > timer->card->number)
 845                                 break;
 846                         if (timer1->card->number < timer->card->number)
 847                                 continue;
 848                 }
 849                 if (timer1->tmr_device > timer->tmr_device)
 850                         break;
 851                 if (timer1->tmr_device < timer->tmr_device)
 852                         continue;
 853                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 854                         break;
 855                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 856                         continue;
 857                 /* conflicts.. */
 858                 up(&register_mutex);
 859                 return -EBUSY;
 860         }
 861         list_add_tail(&timer->device_list, p);
 862         up(&register_mutex);
 863         return 0;
 864 }
 865
 866 static int snd_timer_unregister(snd_timer_t *timer)
 867 {
 868         struct list_head *p, *n;
 869         snd_timer_instance_t *ti;
 870
 871         snd_assert(timer != NULL, return -ENXIO);
 872         down(&register_mutex);
 873         if (! list_empty(&timer->open_list_head)) {
 874                 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
 875                 list_for_each_safe(p, n, &timer->open_list_head) {
 876                         list_del_init(p);
 877                         ti = list_entry(p, snd_timer_instance_t, open_list);
 878                         ti->timer = NULL;
 879                 }
 880         }
 881         list_del(&timer->device_list);
 882         up(&register_mutex);
 883         return snd_timer_free(timer);
 884 }
 885
 886 static int snd_timer_dev_unregister(snd_device_t *device)
 887 {
 888         snd_timer_t *timer = device->device_data;
 889         return snd_timer_unregister(timer);
 890 }
 891
 892 void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event,
 893                       struct timespec *tstamp)
 894 {
 895         unsigned long flags;
 896         unsigned long resolution = 0;
 897         snd_timer_instance_t *ti, *ts;
 898         struct list_head *p, *n;
 899
 900         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 901                 return;
 902         snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
 903                    event <= SNDRV_TIMER_EVENT_MRESUME, return);
 904         spin_lock_irqsave(&timer->lock, flags);
 905         if (event == SNDRV_TIMER_EVENT_MSTART ||
 906             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 907             event == SNDRV_TIMER_EVENT_MRESUME) {
 908                 if (timer->hw.c_resolution)
 909                         resolution = timer->hw.c_resolution(timer);
 910                 else
 911                         resolution = timer->hw.resolution;
 912         }
 913         list_for_each(p, &timer->active_list_head) {
 914                 ti = list_entry(p, snd_timer_instance_t, active_list);
 915                 if (ti->ccallback)
 916                         ti->ccallback(ti, event, tstamp, resolution);
 917                 list_for_each(n, &ti->slave_active_head) {
 918                         ts = list_entry(n, snd_timer_instance_t, active_list);
 919                         if (ts->ccallback)
 920                                 ts->ccallback(ts, event, tstamp, resolution);
 921                 }
 922         }
 923         spin_unlock_irqrestore(&timer->lock, flags);
 924 }
 925
 926 /*
 927  * exported functions for global timers
 928  */
 929 int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
 930 {
 931         snd_timer_id_t tid;
 932
 933         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 934         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 935         tid.card = -1;
 936         tid.device = device;
 937         tid.subdevice = 0;
 938         return snd_timer_new(NULL, id, &tid, rtimer);
 939 }
 940
 941 int snd_timer_global_free(snd_timer_t *timer)
 942 {
 943         return snd_timer_free(timer);
 944 }
 945
 946 int snd_timer_global_register(snd_timer_t *timer)
 947 {
 948         snd_device_t dev;
 949
 950         memset(&dev, 0, sizeof(dev));
 951         dev.device_data = timer;
 952         return snd_timer_dev_register(&dev);
 953 }
 954
 955 int snd_timer_global_unregister(snd_timer_t *timer)
 956 {
 957         return snd_timer_unregister(timer);
 958 }
 959
 960 /*
 961  *  System timer
 962  */
 963
 964 struct snd_timer_system_private {
 965         struct timer_list tlist;
 966         struct timer * timer;
 967         unsigned long last_expires;
 968         unsigned long last_jiffies;
 969         unsigned long correction;
 970 };
 971
 972 static void snd_timer_s_function(unsigned long data)
 973 {
 974         snd_timer_t *timer = (snd_timer_t *)data;
 975         struct snd_timer_system_private *priv = timer->private_data;
 976         unsigned long jiff = jiffies;
 977         if (time_after(jiff, priv->last_expires))
 978                 priv->correction = (long)jiff - (long)priv->last_expires;
 979         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
 980 }
 981
 982 static int snd_timer_s_start(snd_timer_t * timer)
 983 {
 984         struct snd_timer_system_private *priv;
 985         unsigned long njiff;
 986
 987         priv = (struct snd_timer_system_private *) timer->private_data;
 988         njiff = (priv->last_jiffies = jiffies);
 989         if (priv->correction > timer->sticks - 1) {
 990                 priv->correction -= timer->sticks - 1;
 991                 njiff++;
 992         } else {
 993                 njiff += timer->sticks - priv->correction;
 994                 priv->correction -= timer->sticks;
 995         }
 996         priv->last_expires = priv->tlist.expires = njiff;
 997         add_timer(&priv->tlist);
 998         return 0;
 999 }
1000
1001 static int snd_timer_s_stop(snd_timer_t * timer)
1002 {
1003         struct snd_timer_system_private *priv;
1004         unsigned long jiff;
1005
1006         priv = (struct snd_timer_system_private *) timer->private_data;
1007         del_timer(&priv->tlist);
1008         jiff = jiffies;
1009         if (time_before(jiff, priv->last_expires))
1010                 timer->sticks = priv->last_expires - jiff;
1011         else
1012                 timer->sticks = 1;
1013         return 0;
1014 }
1015
1016 static struct _snd_timer_hardware snd_timer_system =
1017 {
1018         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1019         .resolution =   1000000000L / HZ,
1020         .ticks =        10000000L,
1021         .start =        snd_timer_s_start,
1022         .stop =         snd_timer_s_stop
1023 };
1024
1025 static void snd_timer_free_system(snd_timer_t *timer)
1026 {
1027         kfree(timer->private_data);
1028 }
1029
1030 static int snd_timer_register_system(void)
1031 {
1032         snd_timer_t *timer;
1033         struct snd_timer_system_private *priv;
1034         int err;
1035
1036         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1037         if (err < 0)
1038                 return err;
1039         strcpy(timer->name, "system timer");
1040         timer->hw = snd_timer_system;
1041         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1042         if (priv == NULL) {
1043                 snd_timer_free(timer);
1044                 return -ENOMEM;
1045         }
1046         init_timer(&priv->tlist);
1047         priv->tlist.function = snd_timer_s_function;
1048         priv->tlist.data = (unsigned long) timer;
1049         timer->private_data = priv;
1050         timer->private_free = snd_timer_free_system;
1051         return snd_timer_global_register(timer);
1052 }
1053
1054 /*
1055  *  Info interface
1056  */
1057
1058 static void snd_timer_proc_read(snd_info_entry_t *entry,
1059                                 snd_info_buffer_t * buffer)
1060 {
1061         unsigned long flags;
1062         snd_timer_t *timer;
1063         snd_timer_instance_t *ti;
1064         struct list_head *p, *q;
1065
1066         down(&register_mutex);
1067         list_for_each(p, &snd_timer_list) {
1068                 timer = list_entry(p, snd_timer_t, device_list);
1069                 switch (timer->tmr_class) {
1070                 case SNDRV_TIMER_CLASS_GLOBAL:
1071                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1072                         break;
1073                 case SNDRV_TIMER_CLASS_CARD:
1074                         snd_iprintf(buffer, "C%i-%i: ",
1075                                     timer->card->number, timer->tmr_device);
1076                         break;
1077                 case SNDRV_TIMER_CLASS_PCM:
1078                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1079                                     timer->tmr_device, timer->tmr_subdevice);
1080                         break;
1081                 default:
1082                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1083                                     timer->card ? timer->card->number : -1,
1084                                     timer->tmr_device, timer->tmr_subdevice);
1085                 }
1086                 snd_iprintf(buffer, "%s :", timer->name);
1087                 if (timer->hw.resolution)
1088                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1089                                     timer->hw.resolution / 1000,
1090                                     timer->hw.resolution % 1000,
1091                                     timer->hw.ticks);
1092                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1093                         snd_iprintf(buffer, " SLAVE");
1094                 snd_iprintf(buffer, "\n");
1095                 spin_lock_irqsave(&timer->lock, flags);
1096                 list_for_each(q, &timer->open_list_head) {
1097                         ti = list_entry(q, snd_timer_instance_t, open_list);
1098                         snd_iprintf(buffer, "  Client %s : %s\n",
1099                                     ti->owner ? ti->owner : "unknown",
1100                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1101                                                  SNDRV_TIMER_IFLG_RUNNING)
1102                                     ? "running" : "stopped");
1103                 }
1104                 spin_unlock_irqrestore(&timer->lock, flags);
1105         }
1106         up(&register_mutex);
1107 }
1108
1109 /*
1110  *  USER SPACE interface
1111  */
1112
1113 static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1114                                      unsigned long resolution,
1115                                      unsigned long ticks)
1116 {
1117         snd_timer_user_t *tu = timeri->callback_data;
1118         snd_timer_read_t *r;
1119         int prev;
1120
1121         spin_lock(&tu->qlock);
1122         if (tu->qused > 0) {
1123                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1124                 r = &tu->queue[prev];
1125                 if (r->resolution == resolution) {
1126                         r->ticks += ticks;
1127                         goto __wake;
1128                 }
1129         }
1130         if (tu->qused >= tu->queue_size) {
1131                 tu->overrun++;
1132         } else {
1133                 r = &tu->queue[tu->qtail++];
1134                 tu->qtail %= tu->queue_size;
1135                 r->resolution = resolution;
1136                 r->ticks = ticks;
1137                 tu->qused++;
1138         }
1139       __wake:
1140         spin_unlock(&tu->qlock);
1141         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1142         wake_up(&tu->qchange_sleep);
1143 }
1144
1145 static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu,
1146                                             snd_timer_tread_t *tread)
1147 {
1148         if (tu->qused >= tu->queue_size) {
1149                 tu->overrun++;
1150         } else {
1151                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1152                 tu->qtail %= tu->queue_size;
1153                 tu->qused++;
1154         }
1155 }
1156
1157 static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1158                                      enum sndrv_timer_event event,
1159                                      struct timespec *tstamp,
1160                                      unsigned long resolution)
1161 {
1162         snd_timer_user_t *tu = timeri->callback_data;
1163         snd_timer_tread_t r1;
1164
1165         if (event >= SNDRV_TIMER_EVENT_START &&
1166             event <= SNDRV_TIMER_EVENT_PAUSE)
1167                 tu->tstamp = *tstamp;
1168         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1169                 return;
1170         r1.event = event;
1171         r1.tstamp = *tstamp;
1172         r1.val = resolution;
1173         spin_lock(&tu->qlock);
1174         snd_timer_user_append_to_tqueue(tu, &r1);
1175         spin_unlock(&tu->qlock);
1176         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1177         wake_up(&tu->qchange_sleep);
1178 }
1179
1180 static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
1181                                       unsigned long resolution,
1182                                       unsigned long ticks)
1183 {
1184         snd_timer_user_t *tu = timeri->callback_data;
1185         snd_timer_tread_t *r, r1;
1186         struct timespec tstamp;
1187         int prev, append = 0;
1188
1189         memset(&tstamp, 0, sizeof(tstamp));
1190         spin_lock(&tu->qlock);
1191         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1192                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1193                 spin_unlock(&tu->qlock);
1194                 return;
1195         }
1196         if (tu->last_resolution != resolution || ticks > 0)
1197                 getnstimeofday(&tstamp);
1198         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1199             tu->last_resolution != resolution) {
1200                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1201                 r1.tstamp = tstamp;
1202                 r1.val = resolution;
1203                 snd_timer_user_append_to_tqueue(tu, &r1);
1204                 tu->last_resolution = resolution;
1205                 append++;
1206         }
1207         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1208                 goto __wake;
1209         if (ticks == 0)
1210                 goto __wake;
1211         if (tu->qused > 0) {
1212                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1213                 r = &tu->tqueue[prev];
1214                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1215                         r->tstamp = tstamp;
1216                         r->val += ticks;
1217                         append++;
1218                         goto __wake;
1219                 }
1220         }
1221         r1.event = SNDRV_TIMER_EVENT_TICK;
1222         r1.tstamp = tstamp;
1223         r1.val = ticks;
1224         snd_timer_user_append_to_tqueue(tu, &r1);
1225         append++;
1226       __wake:
1227         spin_unlock(&tu->qlock);
1228         if (append == 0)
1229                 return;
1230         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1231         wake_up(&tu->qchange_sleep);
1232 }
1233
1234 static int snd_timer_user_open(struct inode *inode, struct file *file)
1235 {
1236         snd_timer_user_t *tu;
1237
1238         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1239         if (tu == NULL)
1240                 return -ENOMEM;
1241         spin_lock_init(&tu->qlock);
1242         init_waitqueue_head(&tu->qchange_sleep);
1243         init_MUTEX(&tu->tread_sem);
1244         tu->ticks = 1;
1245         tu->queue_size = 128;
1246         tu->queue = kmalloc(tu->queue_size * sizeof(snd_timer_read_t),
1247                             GFP_KERNEL);
1248         if (tu->queue == NULL) {
1249                 kfree(tu);
1250                 return -ENOMEM;
1251         }
1252         file->private_data = tu;
1253         return 0;
1254 }
1255
1256 static int snd_timer_user_release(struct inode *inode, struct file *file)
1257 {
1258         snd_timer_user_t *tu;
1259
1260         if (file->private_data) {
1261                 tu = file->private_data;
1262                 file->private_data = NULL;
1263                 fasync_helper(-1, file, 0, &tu->fasync);
1264                 if (tu->timeri)
1265                         snd_timer_close(tu->timeri);
1266                 kfree(tu->queue);
1267                 kfree(tu->tqueue);
1268                 kfree(tu);
1269         }
1270         return 0;
1271 }
1272
1273 static void snd_timer_user_zero_id(snd_timer_id_t *id)
1274 {
1275         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1276         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1277         id->card = -1;
1278         id->device = -1;
1279         id->subdevice = -1;
1280 }
1281
1282 static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1283 {
1284         id->dev_class = timer->tmr_class;
1285         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1286         id->card = timer->card ? timer->card->number : -1;
1287         id->device = timer->tmr_device;
1288         id->subdevice = timer->tmr_subdevice;
1289 }
1290
1291 static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1292 {
1293         snd_timer_id_t id;
1294         snd_timer_t *timer;
1295         struct list_head *p;
1296
1297         if (copy_from_user(&id, _tid, sizeof(id)))
1298                 return -EFAULT;
1299         down(&register_mutex);
1300         if (id.dev_class < 0) {         /* first item */
1301                 if (list_empty(&snd_timer_list))
1302                         snd_timer_user_zero_id(&id);
1303                 else {
1304                         timer = list_entry(snd_timer_list.next,
1305                                            snd_timer_t, device_list);
1306                         snd_timer_user_copy_id(&id, timer);
1307                 }
1308         } else {
1309                 switch (id.dev_class) {
1310                 case SNDRV_TIMER_CLASS_GLOBAL:
1311                         id.device = id.device < 0 ? 0 : id.device + 1;
1312                         list_for_each(p, &snd_timer_list) {
1313                                 timer = list_entry(p, snd_timer_t, device_list);
1314                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1315                                         snd_timer_user_copy_id(&id, timer);
1316                                         break;
1317                                 }
1318                                 if (timer->tmr_device >= id.device) {
1319                                         snd_timer_user_copy_id(&id, timer);
1320                                         break;
1321                                 }
1322                         }
1323                         if (p == &snd_timer_list)
1324                                 snd_timer_user_zero_id(&id);
1325                         break;
1326                 case SNDRV_TIMER_CLASS_CARD:
1327                 case SNDRV_TIMER_CLASS_PCM:
1328                         if (id.card < 0) {
1329                                 id.card = 0;
1330                         } else {
1331                                 if (id.card < 0) {
1332                                         id.card = 0;
1333                                 } else {
1334                                         if (id.device < 0) {
1335                                                 id.device = 0;
1336                                         } else {
1337                                                 if (id.subdevice < 0) {
1338                                                         id.subdevice = 0;
1339                                                 } else {
1340                                                         id.subdevice++;
1341                                                 }
1342                                         }
1343                                 }
1344                         }
1345                         list_for_each(p, &snd_timer_list) {
1346                                 timer = list_entry(p, snd_timer_t, device_list);
1347                                 if (timer->tmr_class > id.dev_class) {
1348                                         snd_timer_user_copy_id(&id, timer);
1349                                         break;
1350                                 }
1351                                 if (timer->tmr_class < id.dev_class)
1352                                         continue;
1353                                 if (timer->card->number > id.card) {
1354                                         snd_timer_user_copy_id(&id, timer);
1355                                         break;
1356                                 }
1357                                 if (timer->card->number < id.card)
1358                                         continue;
1359                                 if (timer->tmr_device > id.device) {
1360                                         snd_timer_user_copy_id(&id, timer);
1361                                         break;
1362                                 }
1363                                 if (timer->tmr_device < id.device)
1364                                         continue;
1365                                 if (timer->tmr_subdevice > id.subdevice) {
1366                                         snd_timer_user_copy_id(&id, timer);
1367                                         break;
1368                                 }
1369                                 if (timer->tmr_subdevice < id.subdevice)
1370                                         continue;
1371                                 snd_timer_user_copy_id(&id, timer);
1372                                 break;
1373                         }
1374                         if (p == &snd_timer_list)
1375                                 snd_timer_user_zero_id(&id);
1376                         break;
1377                 default:
1378                         snd_timer_user_zero_id(&id);
1379                 }
1380         }
1381         up(&register_mutex);
1382         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1383                 return -EFAULT;
1384         return 0;
1385 }
1386
1387 static int snd_timer_user_ginfo(struct file *file,
1388                                 snd_timer_ginfo_t __user *_ginfo)
1389 {
1390         snd_timer_ginfo_t *ginfo;
1391         snd_timer_id_t tid;
1392         snd_timer_t *t;
1393         struct list_head *p;
1394         int err = 0;
1395
1396         ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1397         if (! ginfo)
1398                 return -ENOMEM;
1399         if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1400                 kfree(ginfo);
1401                 return -EFAULT;
1402         }
1403         tid = ginfo->tid;
1404         memset(ginfo, 0, sizeof(*ginfo));
1405         ginfo->tid = tid;
1406         down(&register_mutex);
1407         t = snd_timer_find(&tid);
1408         if (t != NULL) {
1409                 ginfo->card = t->card ? t->card->number : -1;
1410                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1411                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1412                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1413                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1414                 ginfo->resolution = t->hw.resolution;
1415                 if (t->hw.resolution_min > 0) {
1416                         ginfo->resolution_min = t->hw.resolution_min;
1417                         ginfo->resolution_max = t->hw.resolution_max;
1418                 }
1419                 list_for_each(p, &t->open_list_head) {
1420                         ginfo->clients++;
1421                 }
1422         } else {
1423                 err = -ENODEV;
1424         }
1425         up(&register_mutex);
1426         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1427                 err = -EFAULT;
1428         kfree(ginfo);
1429         return err;
1430 }
1431
1432 static int snd_timer_user_gparams(struct file *file,
1433                                   snd_timer_gparams_t __user *_gparams)
1434 {
1435         snd_timer_gparams_t gparams;
1436         snd_timer_t *t;
1437         int err;
1438
1439         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1440                 return -EFAULT;
1441         down(&register_mutex);
1442         t = snd_timer_find(&gparams.tid);
1443         if (!t) {
1444                 err = -ENODEV;
1445                 goto _error;
1446         }
1447         if (!list_empty(&t->open_list_head)) {
1448                 err = -EBUSY;
1449                 goto _error;
1450         }
1451         if (!t->hw.set_period) {
1452                 err = -ENOSYS;
1453                 goto _error;
1454         }
1455         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1456 _error:
1457         up(&register_mutex);
1458         return err;
1459 }
1460
1461 static int snd_timer_user_gstatus(struct file *file,
1462                                   snd_timer_gstatus_t __user *_gstatus)
1463 {
1464         snd_timer_gstatus_t gstatus;
1465         snd_timer_id_t tid;
1466         snd_timer_t *t;
1467         int err = 0;
1468
1469         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1470                 return -EFAULT;
1471         tid = gstatus.tid;
1472         memset(&gstatus, 0, sizeof(gstatus));
1473         gstatus.tid = tid;
1474         down(&register_mutex);
1475         t = snd_timer_find(&tid);
1476         if (t != NULL) {
1477                 if (t->hw.c_resolution)
1478                         gstatus.resolution = t->hw.c_resolution(t);
1479                 else
1480                         gstatus.resolution = t->hw.resolution;
1481                 if (t->hw.precise_resolution) {
1482                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1483                                                  &gstatus.resolution_den);
1484                 } else {
1485                         gstatus.resolution_num = gstatus.resolution;
1486                         gstatus.resolution_den = 1000000000uL;
1487                 }
1488         } else {
1489                 err = -ENODEV;
1490         }
1491         up(&register_mutex);
1492         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1493                 err = -EFAULT;
1494         return err;
1495 }
1496
1497 static int snd_timer_user_tselect(struct file *file,
1498                                   snd_timer_select_t __user *_tselect)
1499 {
1500         snd_timer_user_t *tu;
1501         snd_timer_select_t tselect;
1502         char str[32];
1503         int err = 0;
1504
1505         tu = file->private_data;
1506         down(&tu->tread_sem);
1507         if (tu->timeri) {
1508                 snd_timer_close(tu->timeri);
1509                 tu->timeri = NULL;
1510         }
1511         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1512                 err = -EFAULT;
1513                 goto __err;
1514         }
1515         sprintf(str, "application %i", current->pid);
1516         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1517                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1518         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1519         if (err < 0)
1520                 goto __err;
1521
1522         kfree(tu->queue);
1523         tu->queue = NULL;
1524         kfree(tu->tqueue);
1525         tu->tqueue = NULL;
1526         if (tu->tread) {
1527                 tu->tqueue = kmalloc(tu->queue_size * sizeof(snd_timer_tread_t),
1528                                      GFP_KERNEL);
1529                 if (tu->tqueue == NULL)
1530                         err = -ENOMEM;
1531         } else {
1532                 tu->queue = kmalloc(tu->queue_size * sizeof(snd_timer_read_t),
1533                                     GFP_KERNEL);
1534                 if (tu->queue == NULL)
1535                         err = -ENOMEM;
1536         }
1537
1538         if (err < 0) {
1539                 snd_timer_close(tu->timeri);
1540                 tu->timeri = NULL;
1541         } else {
1542                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1543                 tu->timeri->callback = tu->tread
1544                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1545                 tu->timeri->ccallback = snd_timer_user_ccallback;
1546                 tu->timeri->callback_data = (void *)tu;
1547         }
1548
1549       __err:
1550         up(&tu->tread_sem);
1551         return err;
1552 }
1553
1554 static int snd_timer_user_info(struct file *file,
1555                                snd_timer_info_t __user *_info)
1556 {
1557         snd_timer_user_t *tu;
1558         snd_timer_info_t *info;
1559         snd_timer_t *t;
1560         int err = 0;
1561
1562         tu = file->private_data;
1563         snd_assert(tu->timeri != NULL, return -ENXIO);
1564         t = tu->timeri->timer;
1565         snd_assert(t != NULL, return -ENXIO);
1566
1567         info = kzalloc(sizeof(*info), GFP_KERNEL);
1568         if (! info)
1569                 return -ENOMEM;
1570         info->card = t->card ? t->card->number : -1;
1571         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1572                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1573         strlcpy(info->id, t->id, sizeof(info->id));
1574         strlcpy(info->name, t->name, sizeof(info->name));
1575         info->resolution = t->hw.resolution;
1576         if (copy_to_user(_info, info, sizeof(*_info)))
1577                 err = -EFAULT;
1578         kfree(info);
1579         return err;
1580 }
1581
1582 static int snd_timer_user_params(struct file *file,
1583                                  snd_timer_params_t __user *_params)
1584 {
1585         snd_timer_user_t *tu;
1586         snd_timer_params_t params;
1587         snd_timer_t *t;
1588         snd_timer_read_t *tr;
1589         snd_timer_tread_t *ttr;
1590         int err;
1591
1592         tu = file->private_data;
1593         snd_assert(tu->timeri != NULL, return -ENXIO);
1594         t = tu->timeri->timer;
1595         snd_assert(t != NULL, return -ENXIO);
1596         if (copy_from_user(&params, _params, sizeof(params)))
1597                 return -EFAULT;
1598         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1599                 err = -EINVAL;
1600                 goto _end;
1601         }
1602         if (params.queue_size > 0 &&
1603             (params.queue_size < 32 || params.queue_size > 1024)) {
1604                 err = -EINVAL;
1605                 goto _end;
1606         }
1607         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1608                               (1<<SNDRV_TIMER_EVENT_TICK)|
1609                               (1<<SNDRV_TIMER_EVENT_START)|
1610                               (1<<SNDRV_TIMER_EVENT_STOP)|
1611                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1612                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1613                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1614                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1615                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1616                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1617                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1618                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1619                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1620                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1621                 err = -EINVAL;
1622                 goto _end;
1623         }
1624         snd_timer_stop(tu->timeri);
1625         spin_lock_irq(&t->lock);
1626         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1627                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1628                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1629         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1630                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1631         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1632                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1633         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1634                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1635         spin_unlock_irq(&t->lock);
1636         if (params.queue_size > 0 &&
1637             (unsigned int)tu->queue_size != params.queue_size) {
1638                 if (tu->tread) {
1639                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1640                                       GFP_KERNEL);
1641                         if (ttr) {
1642                                 kfree(tu->tqueue);
1643                                 tu->queue_size = params.queue_size;
1644                                 tu->tqueue = ttr;
1645                         }
1646                 } else {
1647                         tr = kmalloc(params.queue_size * sizeof(*tr),
1648                                      GFP_KERNEL);
1649                         if (tr) {
1650                                 kfree(tu->queue);
1651                                 tu->queue_size = params.queue_size;
1652                                 tu->queue = tr;
1653                         }
1654                 }
1655         }
1656         tu->qhead = tu->qtail = tu->qused = 0;
1657         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1658                 if (tu->tread) {
1659                         snd_timer_tread_t tread;
1660                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1661                         tread.tstamp.tv_sec = 0;
1662                         tread.tstamp.tv_nsec = 0;
1663                         tread.val = 0;
1664                         snd_timer_user_append_to_tqueue(tu, &tread);
1665                 } else {
1666                         snd_timer_read_t *r = &tu->queue[0];
1667                         r->resolution = 0;
1668                         r->ticks = 0;
1669                         tu->qused++;
1670                         tu->qtail++;
1671                 }
1672         }
1673         tu->filter = params.filter;
1674         tu->ticks = params.ticks;
1675         err = 0;
1676  _end:
1677         if (copy_to_user(_params, &params, sizeof(params)))
1678                 return -EFAULT;
1679         return err;
1680 }
1681
1682 static int snd_timer_user_status(struct file *file,
1683                                  snd_timer_status_t __user *_status)
1684 {
1685         snd_timer_user_t *tu;
1686         snd_timer_status_t status;
1687
1688         tu = file->private_data;
1689         snd_assert(tu->timeri != NULL, return -ENXIO);
1690         memset(&status, 0, sizeof(status));
1691         status.tstamp = tu->tstamp;
1692         status.resolution = snd_timer_resolution(tu->timeri);
1693         status.lost = tu->timeri->lost;
1694         status.overrun = tu->overrun;
1695         spin_lock_irq(&tu->qlock);
1696         status.queue = tu->qused;
1697         spin_unlock_irq(&tu->qlock);
1698         if (copy_to_user(_status, &status, sizeof(status)))
1699                 return -EFAULT;
1700         return 0;
1701 }
1702
1703 static int snd_timer_user_start(struct file *file)
1704 {
1705         int err;
1706         snd_timer_user_t *tu;
1707
1708         tu = file->private_data;
1709         snd_assert(tu->timeri != NULL, return -ENXIO);
1710         snd_timer_stop(tu->timeri);
1711         tu->timeri->lost = 0;
1712         tu->last_resolution = 0;
1713         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1714 }
1715
1716 static int snd_timer_user_stop(struct file *file)
1717 {
1718         int err;
1719         snd_timer_user_t *tu;
1720
1721         tu = file->private_data;
1722         snd_assert(tu->timeri != NULL, return -ENXIO);
1723         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1724 }
1725
1726 static int snd_timer_user_continue(struct file *file)
1727 {
1728         int err;
1729         snd_timer_user_t *tu;
1730
1731         tu = file->private_data;
1732         snd_assert(tu->timeri != NULL, return -ENXIO);
1733         tu->timeri->lost = 0;
1734         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1735 }
1736
1737 static int snd_timer_user_pause(struct file *file)
1738 {
1739         int err;
1740         snd_timer_user_t *tu;
1741
1742         tu = file->private_data;
1743         snd_assert(tu->timeri != NULL, return -ENXIO);
1744         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1745 }
1746
1747 enum {
1748         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1749         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1750         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1751         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1752 };
1753
1754 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1755                                  unsigned long arg)
1756 {
1757         snd_timer_user_t *tu;
1758         void __user *argp = (void __user *)arg;
1759         int __user *p = argp;
1760
1761         tu = file->private_data;
1762         switch (cmd) {
1763         case SNDRV_TIMER_IOCTL_PVERSION:
1764                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1765         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1766                 return snd_timer_user_next_device(argp);
1767         case SNDRV_TIMER_IOCTL_TREAD:
1768         {
1769                 int xarg;
1770
1771                 down(&tu->tread_sem);
1772                 if (tu->timeri) {       /* too late */
1773                         up(&tu->tread_sem);
1774                         return -EBUSY;
1775                 }
1776                 if (get_user(xarg, p)) {
1777                         up(&tu->tread_sem);
1778                         return -EFAULT;
1779                 }
1780                 tu->tread = xarg ? 1 : 0;
1781                 up(&tu->tread_sem);
1782                 return 0;
1783         }
1784         case SNDRV_TIMER_IOCTL_GINFO:
1785                 return snd_timer_user_ginfo(file, argp);
1786         case SNDRV_TIMER_IOCTL_GPARAMS:
1787                 return snd_timer_user_gparams(file, argp);
1788         case SNDRV_TIMER_IOCTL_GSTATUS:
1789                 return snd_timer_user_gstatus(file, argp);
1790         case SNDRV_TIMER_IOCTL_SELECT:
1791                 return snd_timer_user_tselect(file, argp);
1792         case SNDRV_TIMER_IOCTL_INFO:
1793                 return snd_timer_user_info(file, argp);
1794         case SNDRV_TIMER_IOCTL_PARAMS:
1795                 return snd_timer_user_params(file, argp);
1796         case SNDRV_TIMER_IOCTL_STATUS:
1797                 return snd_timer_user_status(file, argp);
1798         case SNDRV_TIMER_IOCTL_START:
1799         case SNDRV_TIMER_IOCTL_START_OLD:
1800                 return snd_timer_user_start(file);
1801         case SNDRV_TIMER_IOCTL_STOP:
1802         case SNDRV_TIMER_IOCTL_STOP_OLD:
1803                 return snd_timer_user_stop(file);
1804         case SNDRV_TIMER_IOCTL_CONTINUE:
1805         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1806                 return snd_timer_user_continue(file);
1807         case SNDRV_TIMER_IOCTL_PAUSE:
1808         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1809                 return snd_timer_user_pause(file);
1810         }
1811         return -ENOTTY;
1812 }
1813
1814 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1815 {
1816         snd_timer_user_t *tu;
1817         int err;
1818
1819         tu = file->private_data;
1820         err = fasync_helper(fd, file, on, &tu->fasync);
1821         if (err < 0)
1822                 return err;
1823         return 0;
1824 }
1825
1826 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1827                                    size_t count, loff_t *offset)
1828 {
1829         snd_timer_user_t *tu;
1830         long result = 0, unit;
1831         int err = 0;
1832
1833         tu = file->private_data;
1834         unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1835         spin_lock_irq(&tu->qlock);
1836         while ((long)count - result >= unit) {
1837                 while (!tu->qused) {
1838                         wait_queue_t wait;
1839
1840                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1841                                 err = -EAGAIN;
1842                                 break;
1843                         }
1844
1845                         set_current_state(TASK_INTERRUPTIBLE);
1846                         init_waitqueue_entry(&wait, current);
1847                         add_wait_queue(&tu->qchange_sleep, &wait);
1848
1849                         spin_unlock_irq(&tu->qlock);
1850                         schedule();
1851                         spin_lock_irq(&tu->qlock);
1852
1853                         remove_wait_queue(&tu->qchange_sleep, &wait);
1854
1855                         if (signal_pending(current)) {
1856                                 err = -ERESTARTSYS;
1857                                 break;
1858                         }
1859                 }
1860
1861                 spin_unlock_irq(&tu->qlock);
1862                 if (err < 0)
1863                         goto _error;
1864
1865                 if (tu->tread) {
1866                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1867                                          sizeof(snd_timer_tread_t))) {
1868                                 err = -EFAULT;
1869                                 goto _error;
1870                         }
1871                 } else {
1872                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1873                                          sizeof(snd_timer_read_t))) {
1874                                 err = -EFAULT;
1875                                 goto _error;
1876                         }
1877                 }
1878
1879                 tu->qhead %= tu->queue_size;
1880
1881                 result += unit;
1882                 buffer += unit;
1883
1884                 spin_lock_irq(&tu->qlock);
1885                 tu->qused--;
1886         }
1887         spin_unlock_irq(&tu->qlock);
1888  _error:
1889         return result > 0 ? result : err;
1890 }
1891
1892 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1893 {
1894         unsigned int mask;
1895         snd_timer_user_t *tu;
1896
1897         tu = file->private_data;
1898
1899         poll_wait(file, &tu->qchange_sleep, wait);
1900
1901         mask = 0;
1902         if (tu->qused)
1903                 mask |= POLLIN | POLLRDNORM;
1904
1905         return mask;
1906 }
1907
1908 #ifdef CONFIG_COMPAT
1909 #include "timer_compat.c"
1910 #else
1911 #define snd_timer_user_ioctl_compat     NULL
1912 #endif
1913
1914 static struct file_operations snd_timer_f_ops =
1915 {
1916         .owner =        THIS_MODULE,
1917         .read =         snd_timer_user_read,
1918         .open =         snd_timer_user_open,
1919         .release =      snd_timer_user_release,
1920         .poll =         snd_timer_user_poll,
1921         .unlocked_ioctl =       snd_timer_user_ioctl,
1922         .compat_ioctl = snd_timer_user_ioctl_compat,
1923         .fasync =       snd_timer_user_fasync,
1924 };
1925
1926 static snd_minor_t snd_timer_reg =
1927 {
1928         .comment =      "timer",
1929         .f_ops =        &snd_timer_f_ops,
1930 };
1931
1932 /*
1933  *  ENTRY functions
1934  */
1935
1936 static snd_info_entry_t *snd_timer_proc_entry = NULL;
1937
1938 static int __init alsa_timer_init(void)
1939 {
1940         int err;
1941         snd_info_entry_t *entry;
1942
1943 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1944         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1945                               "system timer");
1946 #endif
1947         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1948         if (entry != NULL) {
1949                 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1950                 entry->c.text.read = snd_timer_proc_read;
1951                 if (snd_info_register(entry) < 0) {
1952                         snd_info_free_entry(entry);
1953                         entry = NULL;
1954                 }
1955         }
1956         snd_timer_proc_entry = entry;
1957         if ((err = snd_timer_register_system()) < 0)
1958                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1959                            err);
1960         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1961                                         NULL, 0, &snd_timer_reg, "timer"))<0)
1962                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1963                            err);
1964         return 0;
1965 }
1966
1967 static void __exit alsa_timer_exit(void)
1968 {
1969         struct list_head *p, *n;
1970
1971         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1972         /* unregister the system timer */
1973         list_for_each_safe(p, n, &snd_timer_list) {
1974                 snd_timer_t *timer = list_entry(p, snd_timer_t, device_list);
1975                 snd_timer_unregister(timer);
1976         }
1977         if (snd_timer_proc_entry) {
1978                 snd_info_unregister(snd_timer_proc_entry);
1979                 snd_timer_proc_entry = NULL;
1980         }
1981 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1982         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1983 #endif
1984 }
1985
1986 module_init(alsa_timer_init)
1987 module_exit(alsa_timer_exit)
1988
1989 EXPORT_SYMBOL(snd_timer_open);
1990 EXPORT_SYMBOL(snd_timer_close);
1991 EXPORT_SYMBOL(snd_timer_resolution);
1992 EXPORT_SYMBOL(snd_timer_start);
1993 EXPORT_SYMBOL(snd_timer_stop);
1994 EXPORT_SYMBOL(snd_timer_continue);
1995 EXPORT_SYMBOL(snd_timer_pause);
1996 EXPORT_SYMBOL(snd_timer_new);
1997 EXPORT_SYMBOL(snd_timer_notify);
1998 EXPORT_SYMBOL(snd_timer_global_new);
1999 EXPORT_SYMBOL(snd_timer_global_free);
2000 EXPORT_SYMBOL(snd_timer_global_register);
2001 EXPORT_SYMBOL(snd_timer_global_unregister);
2002 EXPORT_SYMBOL(snd_timer_interrupt);