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