SAFE public projects git trees. - safe/jmp/linux-2.6/blob - sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/delay.h>
  24 #include <linux/init.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/string.h>
  30 #include <sound/core.h>
  31 #include <sound/timer.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/minors.h>
  35 #include <sound/initval.h>
  36 #include <linux/kmod.h>
  37 #ifdef CONFIG_KERNELD
  38 #include <linux/kerneld.h>
  39 #endif
  40
  41 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
  42 #define DEFAULT_TIMER_LIMIT 3
  43 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
  44 #define DEFAULT_TIMER_LIMIT 2
  45 #else
  46 #define DEFAULT_TIMER_LIMIT 1
  47 #endif
  48
  49 static int timer_limit = DEFAULT_TIMER_LIMIT;
  50 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
  51 MODULE_DESCRIPTION("ALSA timer interface");
  52 MODULE_LICENSE("GPL");
  53 module_param(timer_limit, int, 0444);
  54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  55
  56 struct snd_timer_user {
  57         struct snd_timer_instance *timeri;
  58         int tread;              /* enhanced read with timestamps and events */
  59         unsigned long ticks;
  60         unsigned long overrun;
  61         int qhead;
  62         int qtail;
  63         int qused;
  64         int queue_size;
  65         struct snd_timer_read *queue;
  66         struct snd_timer_tread *tqueue;
  67         spinlock_t qlock;
  68         unsigned long last_resolution;
  69         unsigned int filter;
  70         struct timespec tstamp;         /* trigger tstamp */
  71         wait_queue_head_t qchange_sleep;
  72         struct fasync_struct *fasync;
  73         struct semaphore tread_sem;
  74 };
  75
  76 /* list of timers */
  77 static LIST_HEAD(snd_timer_list);
  78
  79 /* list of slave instances */
  80 static LIST_HEAD(snd_timer_slave_list);
  81
  82 /* lock for slave active lists */
  83 static DEFINE_SPINLOCK(slave_active_lock);
  84
  85 static DECLARE_MUTEX(register_mutex);
  86
  87 static int snd_timer_free(struct snd_timer *timer);
  88 static int snd_timer_dev_free(struct snd_device *device);
  89 static int snd_timer_dev_register(struct snd_device *device);
  90 static int snd_timer_dev_unregister(struct snd_device *device);
  91
  92 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  93
  94 /*
  95  * create a timer instance with the given owner string.
  96  * when timer is not NULL, increments the module counter
  97  */
  98 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
  99                                                          struct snd_timer *timer)
 100 {
 101         struct snd_timer_instance *timeri;
 102         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 103         if (timeri == NULL)
 104                 return NULL;
 105         timeri->owner = kstrdup(owner, GFP_KERNEL);
 106         if (! timeri->owner) {
 107                 kfree(timeri);
 108                 return NULL;
 109         }
 110         INIT_LIST_HEAD(&timeri->open_list);
 111         INIT_LIST_HEAD(&timeri->active_list);
 112         INIT_LIST_HEAD(&timeri->ack_list);
 113         INIT_LIST_HEAD(&timeri->slave_list_head);
 114         INIT_LIST_HEAD(&timeri->slave_active_head);
 115
 116         timeri->timer = timer;
 117         if (timer && !try_module_get(timer->module)) {
 118                 kfree(timeri->owner);
 119                 kfree(timeri);
 120                 return NULL;
 121         }
 122
 123         return timeri;
 124 }
 125
 126 /*
 127  * find a timer instance from the given timer id
 128  */
 129 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 130 {
 131         struct snd_timer *timer = NULL;
 132         struct list_head *p;
 133
 134         list_for_each(p, &snd_timer_list) {
 135                 timer = list_entry(p, struct snd_timer, device_list);
 136
 137                 if (timer->tmr_class != tid->dev_class)
 138                         continue;
 139                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 140                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 141                     (timer->card == NULL ||
 142                      timer->card->number != tid->card))
 143                         continue;
 144                 if (timer->tmr_device != tid->device)
 145                         continue;
 146                 if (timer->tmr_subdevice != tid->subdevice)
 147                         continue;
 148                 return timer;
 149         }
 150         return NULL;
 151 }
 152
 153 #ifdef CONFIG_KMOD
 154
 155 static void snd_timer_request(struct snd_timer_id *tid)
 156 {
 157         if (! current->fs->root)
 158                 return;
 159         switch (tid->dev_class) {
 160         case SNDRV_TIMER_CLASS_GLOBAL:
 161                 if (tid->device < timer_limit)
 162                         request_module("snd-timer-%i", tid->device);
 163                 break;
 164         case SNDRV_TIMER_CLASS_CARD:
 165         case SNDRV_TIMER_CLASS_PCM:
 166                 if (tid->card < snd_ecards_limit)
 167                         request_module("snd-card-%i", tid->card);
 168                 break;
 169         default:
 170                 break;
 171         }
 172 }
 173
 174 #endif
 175
 176 /*
 177  * look for a master instance matching with the slave id of the given slave.
 178  * when found, relink the open_link of the slave.
 179  *
 180  * call this with register_mutex down.
 181  */
 182 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 183 {
 184         struct snd_timer *timer;
 185         struct snd_timer_instance *master;
 186         struct list_head *p, *q;
 187
 188         /* FIXME: it's really dumb to look up all entries.. */
 189         list_for_each(p, &snd_timer_list) {
 190                 timer = list_entry(p, struct snd_timer, device_list);
 191                 list_for_each(q, &timer->open_list_head) {
 192                         master = list_entry(q, struct snd_timer_instance, open_list);
 193                         if (slave->slave_class == master->slave_class &&
 194                             slave->slave_id == master->slave_id) {
 195                                 list_del(&slave->open_list);
 196                                 list_add_tail(&slave->open_list,
 197                                               &master->slave_list_head);
 198                                 spin_lock_irq(&slave_active_lock);
 199                                 slave->master = master;
 200                                 slave->timer = master->timer;
 201                                 spin_unlock_irq(&slave_active_lock);
 202                                 return;
 203                         }
 204                 }
 205         }
 206 }
 207
 208 /*
 209  * look for slave instances matching with the slave id of the given master.
 210  * when found, relink the open_link of slaves.
 211  *
 212  * call this with register_mutex down.
 213  */
 214 static void snd_timer_check_master(struct snd_timer_instance *master)
 215 {
 216         struct snd_timer_instance *slave;
 217         struct list_head *p, *n;
 218
 219         /* check all pending slaves */
 220         list_for_each_safe(p, n, &snd_timer_slave_list) {
 221                 slave = list_entry(p, struct snd_timer_instance, open_list);
 222                 if (slave->slave_class == master->slave_class &&
 223                     slave->slave_id == master->slave_id) {
 224                         list_del(p);
 225                         list_add_tail(p, &master->slave_list_head);
 226                         spin_lock_irq(&slave_active_lock);
 227                         slave->master = master;
 228                         slave->timer = master->timer;
 229                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 230                                 list_add_tail(&slave->active_list,
 231                                               &master->slave_active_head);
 232                         spin_unlock_irq(&slave_active_lock);
 233                 }
 234         }
 235 }
 236
 237 /*
 238  * open a timer instance
 239  * when opening a master, the slave id must be here given.
 240  */
 241 int snd_timer_open(struct snd_timer_instance **ti,
 242                    char *owner, struct snd_timer_id *tid,
 243                    unsigned int slave_id)
 244 {
 245         struct snd_timer *timer;
 246         struct snd_timer_instance *timeri = NULL;
 247
 248         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 249                 /* open a slave instance */
 250                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 251                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 252                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
 253                         return -EINVAL;
 254                 }
 255                 down(&register_mutex);
 256                 timeri = snd_timer_instance_new(owner, NULL);
 257                 if (!timeri) {
 258                         up(&register_mutex);
 259                         return -ENOMEM;
 260                 }
 261                 timeri->slave_class = tid->dev_sclass;
 262                 timeri->slave_id = tid->device;
 263                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 264                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 265                 snd_timer_check_slave(timeri);
 266                 up(&register_mutex);
 267                 *ti = timeri;
 268                 return 0;
 269         }
 270
 271         /* open a master instance */
 272         down(&register_mutex);
 273         timer = snd_timer_find(tid);
 274 #ifdef CONFIG_KMOD
 275         if (timer == NULL) {
 276                 up(&register_mutex);
 277                 snd_timer_request(tid);
 278                 down(&register_mutex);
 279                 timer = snd_timer_find(tid);
 280         }
 281 #endif
 282         if (!timer) {
 283                 up(&register_mutex);
 284                 return -ENODEV;
 285         }
 286         if (!list_empty(&timer->open_list_head)) {
 287                 timeri = list_entry(timer->open_list_head.next,
 288                                     struct snd_timer_instance, open_list);
 289                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 290                         up(&register_mutex);
 291                         return -EBUSY;
 292                 }
 293         }
 294         timeri = snd_timer_instance_new(owner, timer);
 295         if (!timeri) {
 296                 up(&register_mutex);
 297                 return -ENOMEM;
 298         }
 299         timeri->slave_class = tid->dev_sclass;
 300         timeri->slave_id = slave_id;
 301         if (list_empty(&timer->open_list_head) && timer->hw.open)
 302                 timer->hw.open(timer);
 303         list_add_tail(&timeri->open_list, &timer->open_list_head);
 304         snd_timer_check_master(timeri);
 305         up(&register_mutex);
 306         *ti = timeri;
 307         return 0;
 308 }
 309
 310 static int _snd_timer_stop(struct snd_timer_instance *timeri,
 311                            int keep_flag, int event);
 312
 313 /*
 314  * close a timer instance
 315  */
 316 int snd_timer_close(struct snd_timer_instance *timeri)
 317 {
 318         struct snd_timer *timer = NULL;
 319         struct list_head *p, *n;
 320         struct snd_timer_instance *slave;
 321
 322         snd_assert(timeri != NULL, return -ENXIO);
 323
 324         /* force to stop the timer */
 325         snd_timer_stop(timeri);
 326
 327         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 328                 /* wait, until the active callback is finished */
 329                 spin_lock_irq(&slave_active_lock);
 330                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 331                         spin_unlock_irq(&slave_active_lock);
 332                         udelay(10);
 333                         spin_lock_irq(&slave_active_lock);
 334                 }
 335                 spin_unlock_irq(&slave_active_lock);
 336                 down(&register_mutex);
 337                 list_del(&timeri->open_list);
 338                 up(&register_mutex);
 339         } else {
 340                 timer = timeri->timer;
 341                 /* wait, until the active callback is finished */
 342                 spin_lock_irq(&timer->lock);
 343                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 344                         spin_unlock_irq(&timer->lock);
 345                         udelay(10);
 346                         spin_lock_irq(&timer->lock);
 347                 }
 348                 spin_unlock_irq(&timer->lock);
 349                 down(&register_mutex);
 350                 list_del(&timeri->open_list);
 351                 if (timer && list_empty(&timer->open_list_head) &&
 352                     timer->hw.close)
 353                         timer->hw.close(timer);
 354                 /* remove slave links */
 355                 list_for_each_safe(p, n, &timeri->slave_list_head) {
 356                         slave = list_entry(p, struct snd_timer_instance, open_list);
 357                         spin_lock_irq(&slave_active_lock);
 358                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
 359                         list_del(p);
 360                         list_add_tail(p, &snd_timer_slave_list);
 361                         slave->master = NULL;
 362                         slave->timer = NULL;
 363                         spin_unlock_irq(&slave_active_lock);
 364                 }
 365                 up(&register_mutex);
 366         }
 367         if (timeri->private_free)
 368                 timeri->private_free(timeri);
 369         kfree(timeri->owner);
 370         kfree(timeri);
 371         if (timer)
 372                 module_put(timer->module);
 373         return 0;
 374 }
 375
 376 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 377 {
 378         struct snd_timer * timer;
 379
 380         if (timeri == NULL)
 381                 return 0;
 382         if ((timer = timeri->timer) != NULL) {
 383                 if (timer->hw.c_resolution)
 384                         return timer->hw.c_resolution(timer);
 385                 return timer->hw.resolution;
 386         }
 387         return 0;
 388 }
 389
 390 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 391 {
 392         struct snd_timer *timer;
 393         unsigned long flags;
 394         unsigned long resolution = 0;
 395         struct snd_timer_instance *ts;
 396         struct list_head *n;
 397         struct timespec tstamp;
 398
 399         getnstimeofday(&tstamp);
 400         snd_assert(event >= SNDRV_TIMER_EVENT_START &&
 401                    event <= SNDRV_TIMER_EVENT_PAUSE, return);
 402         if (event == SNDRV_TIMER_EVENT_START ||
 403             event == SNDRV_TIMER_EVENT_CONTINUE)
 404                 resolution = snd_timer_resolution(ti);
 405         if (ti->ccallback)
 406                 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
 407         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 408                 return;
 409         timer = ti->timer;
 410         if (timer == NULL)
 411                 return;
 412         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 413                 return;
 414         spin_lock_irqsave(&timer->lock, flags);
 415         list_for_each(n, &ti->slave_active_head) {
 416                 ts = list_entry(n, struct snd_timer_instance, active_list);
 417                 if (ts->ccallback)
 418                         ts->ccallback(ti, event + 100, &tstamp, resolution);
 419         }
 420         spin_unlock_irqrestore(&timer->lock, flags);
 421 }
 422
 423 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
 424                             unsigned long sticks)
 425 {
 426         list_del(&timeri->active_list);
 427         list_add_tail(&timeri->active_list, &timer->active_list_head);
 428         if (timer->running) {
 429                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 430                         goto __start_now;
 431                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 432                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 433                 return 1;       /* delayed start */
 434         } else {
 435                 timer->sticks = sticks;
 436                 timer->hw.start(timer);
 437               __start_now:
 438                 timer->running++;
 439                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 440                 return 0;
 441         }
 442 }
 443
 444 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
 445 {
 446         unsigned long flags;
 447
 448         spin_lock_irqsave(&slave_active_lock, flags);
 449         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 450         if (timeri->master)
 451                 list_add_tail(&timeri->active_list,
 452                               &timeri->master->slave_active_head);
 453         spin_unlock_irqrestore(&slave_active_lock, flags);
 454         return 1; /* delayed start */
 455 }
 456
 457 /*
 458  *  start the timer instance
 459  */
 460 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 461 {
 462         struct snd_timer *timer;
 463         int result = -EINVAL;
 464         unsigned long flags;
 465
 466         if (timeri == NULL || ticks < 1)
 467                 return -EINVAL;
 468         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 469                 result = snd_timer_start_slave(timeri);
 470                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 471                 return result;
 472         }
 473         timer = timeri->timer;
 474         if (timer == NULL)
 475                 return -EINVAL;
 476         spin_lock_irqsave(&timer->lock, flags);
 477         timeri->ticks = timeri->cticks = ticks;
 478         timeri->pticks = 0;
 479         result = snd_timer_start1(timer, timeri, ticks);
 480         spin_unlock_irqrestore(&timer->lock, flags);
 481         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 482         return result;
 483 }
 484
 485 static int _snd_timer_stop(struct snd_timer_instance * timeri,
 486                            int keep_flag, int event)
 487 {
 488         struct snd_timer *timer;
 489         unsigned long flags;
 490
 491         snd_assert(timeri != NULL, return -ENXIO);
 492
 493         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 494                 if (!keep_flag) {
 495                         spin_lock_irqsave(&slave_active_lock, flags);
 496                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 497                         spin_unlock_irqrestore(&slave_active_lock, flags);
 498                 }
 499                 goto __end;
 500         }
 501         timer = timeri->timer;
 502         if (!timer)
 503                 return -EINVAL;
 504         spin_lock_irqsave(&timer->lock, flags);
 505         list_del_init(&timeri->ack_list);
 506         list_del_init(&timeri->active_list);
 507         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 508             !(--timer->running)) {
 509                 timer->hw.stop(timer);
 510                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 511                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 512                         snd_timer_reschedule(timer, 0);
 513                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 514                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 515                                 timer->hw.start(timer);
 516                         }
 517                 }
 518         }
 519         if (!keep_flag)
 520                 timeri->flags &=
 521                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 522         spin_unlock_irqrestore(&timer->lock, flags);
 523       __end:
 524         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 525                 snd_timer_notify1(timeri, event);
 526         return 0;
 527 }
 528
 529 /*
 530  * stop the timer instance.
 531  *
 532  * do not call this from the timer callback!
 533  */
 534 int snd_timer_stop(struct snd_timer_instance *timeri)
 535 {
 536         struct snd_timer *timer;
 537         unsigned long flags;
 538         int err;
 539
 540         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
 541         if (err < 0)
 542                 return err;
 543         timer = timeri->timer;
 544         spin_lock_irqsave(&timer->lock, flags);
 545         timeri->cticks = timeri->ticks;
 546         timeri->pticks = 0;
 547         spin_unlock_irqrestore(&timer->lock, flags);
 548         return 0;
 549 }
 550
 551 /*
 552  * start again..  the tick is kept.
 553  */
 554 int snd_timer_continue(struct snd_timer_instance *timeri)
 555 {
 556         struct snd_timer *timer;
 557         int result = -EINVAL;
 558         unsigned long flags;
 559
 560         if (timeri == NULL)
 561                 return result;
 562         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 563                 return snd_timer_start_slave(timeri);
 564         timer = timeri->timer;
 565         if (! timer)
 566                 return -EINVAL;
 567         spin_lock_irqsave(&timer->lock, flags);
 568         if (!timeri->cticks)
 569                 timeri->cticks = 1;
 570         timeri->pticks = 0;
 571         result = snd_timer_start1(timer, timeri, timer->sticks);
 572         spin_unlock_irqrestore(&timer->lock, flags);
 573         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
 574         return result;
 575 }
 576
 577 /*
 578  * pause.. remember the ticks left
 579  */
 580 int snd_timer_pause(struct snd_timer_instance * timeri)
 581 {
 582         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
 583 }
 584
 585 /*
 586  * reschedule the timer
 587  *
 588  * start pending instances and check the scheduling ticks.
 589  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 590  */
 591 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 592 {
 593         struct snd_timer_instance *ti;
 594         unsigned long ticks = ~0UL;
 595         struct list_head *p;
 596
 597         list_for_each(p, &timer->active_list_head) {
 598                 ti = list_entry(p, struct snd_timer_instance, active_list);
 599                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 600                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 601                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 602                         timer->running++;
 603                 }
 604                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 605                         if (ticks > ti->cticks)
 606                                 ticks = ti->cticks;
 607                 }
 608         }
 609         if (ticks == ~0UL) {
 610                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 611                 return;
 612         }
 613         if (ticks > timer->hw.ticks)
 614                 ticks = timer->hw.ticks;
 615         if (ticks_left != ticks)
 616                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 617         timer->sticks = ticks;
 618 }
 619
 620 /*
 621  * timer tasklet
 622  *
 623  */
 624 static void snd_timer_tasklet(unsigned long arg)
 625 {
 626         struct snd_timer *timer = (struct snd_timer *) arg;
 627         struct snd_timer_instance *ti;
 628         struct list_head *p;
 629         unsigned long resolution, ticks;
 630
 631         spin_lock(&timer->lock);
 632         /* now process all callbacks */
 633         while (!list_empty(&timer->sack_list_head)) {
 634                 p = timer->sack_list_head.next;         /* get first item */
 635                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 636
 637                 /* remove from ack_list and make empty */
 638                 list_del_init(p);
 639
 640                 ticks = ti->pticks;
 641                 ti->pticks = 0;
 642                 resolution = ti->resolution;
 643
 644                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 645                 spin_unlock(&timer->lock);
 646                 if (ti->callback)
 647                         ti->callback(ti, resolution, ticks);
 648                 spin_lock(&timer->lock);
 649                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 650         }
 651         spin_unlock(&timer->lock);
 652 }
 653
 654 /*
 655  * timer interrupt
 656  *
 657  * ticks_left is usually equal to timer->sticks.
 658  *
 659  */
 660 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 661 {
 662         struct snd_timer_instance *ti, *ts;
 663         unsigned long resolution, ticks;
 664         struct list_head *p, *q, *n, *ack_list_head;
 665         int use_tasklet = 0;
 666
 667         if (timer == NULL)
 668                 return;
 669
 670         spin_lock(&timer->lock);
 671
 672         /* remember the current resolution */
 673         if (timer->hw.c_resolution)
 674                 resolution = timer->hw.c_resolution(timer);
 675         else
 676                 resolution = timer->hw.resolution;
 677
 678         /* loop for all active instances
 679          * Here we cannot use list_for_each because the active_list of a
 680          * processed instance is relinked to done_list_head before the callback
 681          * is called.
 682          */
 683         list_for_each_safe(p, n, &timer->active_list_head) {
 684                 ti = list_entry(p, struct snd_timer_instance, active_list);
 685                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 686                         continue;
 687                 ti->pticks += ticks_left;
 688                 ti->resolution = resolution;
 689                 if (ti->cticks < ticks_left)
 690                         ti->cticks = 0;
 691                 else
 692                         ti->cticks -= ticks_left;
 693                 if (ti->cticks) /* not expired */
 694                         continue;
 695                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 696                         ti->cticks = ti->ticks;
 697                 } else {
 698                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 699                         if (--timer->running)
 700                                 list_del(p);
 701                 }
 702                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 703                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 704                         ack_list_head = &timer->ack_list_head;
 705                 else
 706                         ack_list_head = &timer->sack_list_head;
 707                 if (list_empty(&ti->ack_list))
 708                         list_add_tail(&ti->ack_list, ack_list_head);
 709                 list_for_each(q, &ti->slave_active_head) {
 710                         ts = list_entry(q, struct snd_timer_instance, active_list);
 711                         ts->pticks = ti->pticks;
 712                         ts->resolution = resolution;
 713                         if (list_empty(&ts->ack_list))
 714                                 list_add_tail(&ts->ack_list, ack_list_head);
 715                 }
 716         }
 717         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 718                 snd_timer_reschedule(timer, ticks_left);
 719         if (timer->running) {
 720                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 721                         timer->hw.stop(timer);
 722                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 723                 }
 724                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 725                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 726                         /* restart timer */
 727                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 728                         timer->hw.start(timer);
 729                 }
 730         } else {
 731                 timer->hw.stop(timer);
 732         }
 733
 734         /* now process all fast callbacks */
 735         while (!list_empty(&timer->ack_list_head)) {
 736                 p = timer->ack_list_head.next;          /* get first item */
 737                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 738
 739                 /* remove from ack_list and make empty */
 740                 list_del_init(p);
 741
 742                 ticks = ti->pticks;
 743                 ti->pticks = 0;
 744
 745                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 746                 spin_unlock(&timer->lock);
 747                 if (ti->callback)
 748                         ti->callback(ti, resolution, ticks);
 749                 spin_lock(&timer->lock);
 750                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 751         }
 752
 753         /* do we have any slow callbacks? */
 754         use_tasklet = !list_empty(&timer->sack_list_head);
 755         spin_unlock(&timer->lock);
 756
 757         if (use_tasklet)
 758                 tasklet_hi_schedule(&timer->task_queue);
 759 }
 760
 761 /*
 762
 763  */
 764
 765 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 766                   struct snd_timer **rtimer)
 767 {
 768         struct snd_timer *timer;
 769         int err;
 770         static struct snd_device_ops ops = {
 771                 .dev_free = snd_timer_dev_free,
 772                 .dev_register = snd_timer_dev_register,
 773                 .dev_unregister = snd_timer_dev_unregister
 774         };
 775
 776         snd_assert(tid != NULL, return -EINVAL);
 777         snd_assert(rtimer != NULL, return -EINVAL);
 778         *rtimer = NULL;
 779         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 780         if (timer == NULL)
 781                 return -ENOMEM;
 782         timer->tmr_class = tid->dev_class;
 783         timer->card = card;
 784         timer->tmr_device = tid->device;
 785         timer->tmr_subdevice = tid->subdevice;
 786         if (id)
 787                 strlcpy(timer->id, id, sizeof(timer->id));
 788         INIT_LIST_HEAD(&timer->device_list);
 789         INIT_LIST_HEAD(&timer->open_list_head);
 790         INIT_LIST_HEAD(&timer->active_list_head);
 791         INIT_LIST_HEAD(&timer->ack_list_head);
 792         INIT_LIST_HEAD(&timer->sack_list_head);
 793         spin_lock_init(&timer->lock);
 794         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 795                      (unsigned long)timer);
 796         if (card != NULL) {
 797                 timer->module = card->module;
 798                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 799                 if (err < 0) {
 800                         snd_timer_free(timer);
 801                         return err;
 802                 }
 803         }
 804         *rtimer = timer;
 805         return 0;
 806 }
 807
 808 static int snd_timer_free(struct snd_timer *timer)
 809 {
 810         snd_assert(timer != NULL, return -ENXIO);
 811         if (timer->private_free)
 812                 timer->private_free(timer);
 813         kfree(timer);
 814         return 0;
 815 }
 816
 817 static int snd_timer_dev_free(struct snd_device *device)
 818 {
 819         struct snd_timer *timer = device->device_data;
 820         return snd_timer_free(timer);
 821 }
 822
 823 static int snd_timer_dev_register(struct snd_device *dev)
 824 {
 825         struct snd_timer *timer = dev->device_data;
 826         struct snd_timer *timer1;
 827         struct list_head *p;
 828
 829         snd_assert(timer != NULL && timer->hw.start != NULL &&
 830                    timer->hw.stop != NULL, return -ENXIO);
 831         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 832             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 833                 return -EINVAL;
 834
 835         down(&register_mutex);
 836         list_for_each(p, &snd_timer_list) {
 837                 timer1 = list_entry(p, struct snd_timer, device_list);
 838                 if (timer1->tmr_class > timer->tmr_class)
 839                         break;
 840                 if (timer1->tmr_class < timer->tmr_class)
 841                         continue;
 842                 if (timer1->card && timer->card) {
 843                         if (timer1->card->number > timer->card->number)
 844                                 break;
 845                         if (timer1->card->number < timer->card->number)
 846                                 continue;
 847                 }
 848                 if (timer1->tmr_device > timer->tmr_device)
 849                         break;
 850                 if (timer1->tmr_device < timer->tmr_device)
 851                         continue;
 852                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 853                         break;
 854                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 855                         continue;
 856                 /* conflicts.. */
 857                 up(&register_mutex);
 858                 return -EBUSY;
 859         }
 860         list_add_tail(&timer->device_list, p);
 861         up(&register_mutex);
 862         return 0;
 863 }
 864
 865 static int snd_timer_unregister(struct snd_timer *timer)
 866 {
 867         struct list_head *p, *n;
 868         struct snd_timer_instance *ti;
 869
 870         snd_assert(timer != NULL, return -ENXIO);
 871         down(&register_mutex);
 872         if (! list_empty(&timer->open_list_head)) {
 873                 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
 874                 list_for_each_safe(p, n, &timer->open_list_head) {
 875                         list_del_init(p);
 876                         ti = list_entry(p, struct snd_timer_instance, open_list);
 877                         ti->timer = NULL;
 878                 }
 879         }
 880         list_del(&timer->device_list);
 881         up(&register_mutex);
 882         return snd_timer_free(timer);
 883 }
 884
 885 static int snd_timer_dev_unregister(struct snd_device *device)
 886 {
 887         struct snd_timer *timer = device->device_data;
 888         return snd_timer_unregister(timer);
 889 }
 890
 891 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 892 {
 893         unsigned long flags;
 894         unsigned long resolution = 0;
 895         struct snd_timer_instance *ti, *ts;
 896         struct list_head *p, *n;
 897
 898         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 899                 return;
 900         snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
 901                    event <= SNDRV_TIMER_EVENT_MRESUME, return);
 902         spin_lock_irqsave(&timer->lock, flags);
 903         if (event == SNDRV_TIMER_EVENT_MSTART ||
 904             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 905             event == SNDRV_TIMER_EVENT_MRESUME) {
 906                 if (timer->hw.c_resolution)
 907                         resolution = timer->hw.c_resolution(timer);
 908                 else
 909                         resolution = timer->hw.resolution;
 910         }
 911         list_for_each(p, &timer->active_list_head) {
 912                 ti = list_entry(p, struct snd_timer_instance, active_list);
 913                 if (ti->ccallback)
 914                         ti->ccallback(ti, event, tstamp, resolution);
 915                 list_for_each(n, &ti->slave_active_head) {
 916                         ts = list_entry(n, struct snd_timer_instance, active_list);
 917                         if (ts->ccallback)
 918                                 ts->ccallback(ts, event, tstamp, resolution);
 919                 }
 920         }
 921         spin_unlock_irqrestore(&timer->lock, flags);
 922 }
 923
 924 /*
 925  * exported functions for global timers
 926  */
 927 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 928 {
 929         struct snd_timer_id tid;
 930
 931         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 932         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 933         tid.card = -1;
 934         tid.device = device;
 935         tid.subdevice = 0;
 936         return snd_timer_new(NULL, id, &tid, rtimer);
 937 }
 938
 939 int snd_timer_global_free(struct snd_timer *timer)
 940 {
 941         return snd_timer_free(timer);
 942 }
 943
 944 int snd_timer_global_register(struct snd_timer *timer)
 945 {
 946         struct snd_device dev;
 947
 948         memset(&dev, 0, sizeof(dev));
 949         dev.device_data = timer;
 950         return snd_timer_dev_register(&dev);
 951 }
 952
 953 int snd_timer_global_unregister(struct snd_timer *timer)
 954 {
 955         return snd_timer_unregister(timer);
 956 }
 957
 958 /*
 959  *  System timer
 960  */
 961
 962 struct snd_timer_system_private {
 963         struct timer_list tlist;
 964         struct timer * timer;
 965         unsigned long last_expires;
 966         unsigned long last_jiffies;
 967         unsigned long correction;
 968 };
 969
 970 static void snd_timer_s_function(unsigned long data)
 971 {
 972         struct snd_timer *timer = (struct snd_timer *)data;
 973         struct snd_timer_system_private *priv = timer->private_data;
 974         unsigned long jiff = jiffies;
 975         if (time_after(jiff, priv->last_expires))
 976                 priv->correction = (long)jiff - (long)priv->last_expires;
 977         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
 978 }
 979
 980 static int snd_timer_s_start(struct snd_timer * timer)
 981 {
 982         struct snd_timer_system_private *priv;
 983         unsigned long njiff;
 984
 985         priv = (struct snd_timer_system_private *) timer->private_data;
 986         njiff = (priv->last_jiffies = jiffies);
 987         if (priv->correction > timer->sticks - 1) {
 988                 priv->correction -= timer->sticks - 1;
 989                 njiff++;
 990         } else {
 991                 njiff += timer->sticks - priv->correction;
 992                 priv->correction -= timer->sticks;
 993         }
 994         priv->last_expires = priv->tlist.expires = njiff;
 995         add_timer(&priv->tlist);
 996         return 0;
 997 }
 998
 999 static int snd_timer_s_stop(struct snd_timer * timer)
1000 {
1001         struct snd_timer_system_private *priv;
1002         unsigned long jiff;
1003
1004         priv = (struct snd_timer_system_private *) timer->private_data;
1005         del_timer(&priv->tlist);
1006         jiff = jiffies;
1007         if (time_before(jiff, priv->last_expires))
1008                 timer->sticks = priv->last_expires - jiff;
1009         else
1010                 timer->sticks = 1;
1011         return 0;
1012 }
1013
1014 static struct snd_timer_hardware snd_timer_system =
1015 {
1016         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1017         .resolution =   1000000000L / HZ,
1018         .ticks =        10000000L,
1019         .start =        snd_timer_s_start,
1020         .stop =         snd_timer_s_stop
1021 };
1022
1023 static void snd_timer_free_system(struct snd_timer *timer)
1024 {
1025         kfree(timer->private_data);
1026 }
1027
1028 static int snd_timer_register_system(void)
1029 {
1030         struct snd_timer *timer;
1031         struct snd_timer_system_private *priv;
1032         int err;
1033
1034         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1035         if (err < 0)
1036                 return err;
1037         strcpy(timer->name, "system timer");
1038         timer->hw = snd_timer_system;
1039         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1040         if (priv == NULL) {
1041                 snd_timer_free(timer);
1042                 return -ENOMEM;
1043         }
1044         init_timer(&priv->tlist);
1045         priv->tlist.function = snd_timer_s_function;
1046         priv->tlist.data = (unsigned long) timer;
1047         timer->private_data = priv;
1048         timer->private_free = snd_timer_free_system;
1049         return snd_timer_global_register(timer);
1050 }
1051
1052 /*
1053  *  Info interface
1054  */
1055
1056 static void snd_timer_proc_read(struct snd_info_entry *entry,
1057                                 struct snd_info_buffer *buffer)
1058 {
1059         unsigned long flags;
1060         struct snd_timer *timer;
1061         struct snd_timer_instance *ti;
1062         struct list_head *p, *q;
1063
1064         down(&register_mutex);
1065         list_for_each(p, &snd_timer_list) {
1066                 timer = list_entry(p, struct snd_timer, device_list);
1067                 switch (timer->tmr_class) {
1068                 case SNDRV_TIMER_CLASS_GLOBAL:
1069                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1070                         break;
1071                 case SNDRV_TIMER_CLASS_CARD:
1072                         snd_iprintf(buffer, "C%i-%i: ",
1073                                     timer->card->number, timer->tmr_device);
1074                         break;
1075                 case SNDRV_TIMER_CLASS_PCM:
1076                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1077                                     timer->tmr_device, timer->tmr_subdevice);
1078                         break;
1079                 default:
1080                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1081                                     timer->card ? timer->card->number : -1,
1082                                     timer->tmr_device, timer->tmr_subdevice);
1083                 }
1084                 snd_iprintf(buffer, "%s :", timer->name);
1085                 if (timer->hw.resolution)
1086                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1087                                     timer->hw.resolution / 1000,
1088                                     timer->hw.resolution % 1000,
1089                                     timer->hw.ticks);
1090                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1091                         snd_iprintf(buffer, " SLAVE");
1092                 snd_iprintf(buffer, "\n");
1093                 spin_lock_irqsave(&timer->lock, flags);
1094                 list_for_each(q, &timer->open_list_head) {
1095                         ti = list_entry(q, struct snd_timer_instance, open_list);
1096                         snd_iprintf(buffer, "  Client %s : %s\n",
1097                                     ti->owner ? ti->owner : "unknown",
1098                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1099                                                  SNDRV_TIMER_IFLG_RUNNING)
1100                                     ? "running" : "stopped");
1101                 }
1102                 spin_unlock_irqrestore(&timer->lock, flags);
1103         }
1104         up(&register_mutex);
1105 }
1106
1107 /*
1108  *  USER SPACE interface
1109  */
1110
1111 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1112                                      unsigned long resolution,
1113                                      unsigned long ticks)
1114 {
1115         struct snd_timer_user *tu = timeri->callback_data;
1116         struct snd_timer_read *r;
1117         int prev;
1118
1119         spin_lock(&tu->qlock);
1120         if (tu->qused > 0) {
1121                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1122                 r = &tu->queue[prev];
1123                 if (r->resolution == resolution) {
1124                         r->ticks += ticks;
1125                         goto __wake;
1126                 }
1127         }
1128         if (tu->qused >= tu->queue_size) {
1129                 tu->overrun++;
1130         } else {
1131                 r = &tu->queue[tu->qtail++];
1132                 tu->qtail %= tu->queue_size;
1133                 r->resolution = resolution;
1134                 r->ticks = ticks;
1135                 tu->qused++;
1136         }
1137       __wake:
1138         spin_unlock(&tu->qlock);
1139         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1140         wake_up(&tu->qchange_sleep);
1141 }
1142
1143 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1144                                             struct snd_timer_tread *tread)
1145 {
1146         if (tu->qused >= tu->queue_size) {
1147                 tu->overrun++;
1148         } else {
1149                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1150                 tu->qtail %= tu->queue_size;
1151                 tu->qused++;
1152         }
1153 }
1154
1155 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1156                                      int event,
1157                                      struct timespec *tstamp,
1158                                      unsigned long resolution)
1159 {
1160         struct snd_timer_user *tu = timeri->callback_data;
1161         struct snd_timer_tread r1;
1162
1163         if (event >= SNDRV_TIMER_EVENT_START &&
1164             event <= SNDRV_TIMER_EVENT_PAUSE)
1165                 tu->tstamp = *tstamp;
1166         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1167                 return;
1168         r1.event = event;
1169         r1.tstamp = *tstamp;
1170         r1.val = resolution;
1171         spin_lock(&tu->qlock);
1172         snd_timer_user_append_to_tqueue(tu, &r1);
1173         spin_unlock(&tu->qlock);
1174         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1175         wake_up(&tu->qchange_sleep);
1176 }
1177
1178 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1179                                       unsigned long resolution,
1180                                       unsigned long ticks)
1181 {
1182         struct snd_timer_user *tu = timeri->callback_data;
1183         struct snd_timer_tread *r, r1;
1184         struct timespec tstamp;
1185         int prev, append = 0;
1186
1187         memset(&tstamp, 0, sizeof(tstamp));
1188         spin_lock(&tu->qlock);
1189         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1190                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1191                 spin_unlock(&tu->qlock);
1192                 return;
1193         }
1194         if (tu->last_resolution != resolution || ticks > 0)
1195                 getnstimeofday(&tstamp);
1196         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1197             tu->last_resolution != resolution) {
1198                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1199                 r1.tstamp = tstamp;
1200                 r1.val = resolution;
1201                 snd_timer_user_append_to_tqueue(tu, &r1);
1202                 tu->last_resolution = resolution;
1203                 append++;
1204         }
1205         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1206                 goto __wake;
1207         if (ticks == 0)
1208                 goto __wake;
1209         if (tu->qused > 0) {
1210                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1211                 r = &tu->tqueue[prev];
1212                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1213                         r->tstamp = tstamp;
1214                         r->val += ticks;
1215                         append++;
1216                         goto __wake;
1217                 }
1218         }
1219         r1.event = SNDRV_TIMER_EVENT_TICK;
1220         r1.tstamp = tstamp;
1221         r1.val = ticks;
1222         snd_timer_user_append_to_tqueue(tu, &r1);
1223         append++;
1224       __wake:
1225         spin_unlock(&tu->qlock);
1226         if (append == 0)
1227                 return;
1228         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1229         wake_up(&tu->qchange_sleep);
1230 }
1231
1232 static int snd_timer_user_open(struct inode *inode, struct file *file)
1233 {
1234         struct snd_timer_user *tu;
1235
1236         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1237         if (tu == NULL)
1238                 return -ENOMEM;
1239         spin_lock_init(&tu->qlock);
1240         init_waitqueue_head(&tu->qchange_sleep);
1241         init_MUTEX(&tu->tread_sem);
1242         tu->ticks = 1;
1243         tu->queue_size = 128;
1244         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1245                             GFP_KERNEL);
1246         if (tu->queue == NULL) {
1247                 kfree(tu);
1248                 return -ENOMEM;
1249         }
1250         file->private_data = tu;
1251         return 0;
1252 }
1253
1254 static int snd_timer_user_release(struct inode *inode, struct file *file)
1255 {
1256         struct snd_timer_user *tu;
1257
1258         if (file->private_data) {
1259                 tu = file->private_data;
1260                 file->private_data = NULL;
1261                 fasync_helper(-1, file, 0, &tu->fasync);
1262                 if (tu->timeri)
1263                         snd_timer_close(tu->timeri);
1264                 kfree(tu->queue);
1265                 kfree(tu->tqueue);
1266                 kfree(tu);
1267         }
1268         return 0;
1269 }
1270
1271 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1272 {
1273         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1274         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1275         id->card = -1;
1276         id->device = -1;
1277         id->subdevice = -1;
1278 }
1279
1280 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1281 {
1282         id->dev_class = timer->tmr_class;
1283         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1284         id->card = timer->card ? timer->card->number : -1;
1285         id->device = timer->tmr_device;
1286         id->subdevice = timer->tmr_subdevice;
1287 }
1288
1289 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1290 {
1291         struct snd_timer_id id;
1292         struct snd_timer *timer;
1293         struct list_head *p;
1294
1295         if (copy_from_user(&id, _tid, sizeof(id)))
1296                 return -EFAULT;
1297         down(&register_mutex);
1298         if (id.dev_class < 0) {         /* first item */
1299                 if (list_empty(&snd_timer_list))
1300                         snd_timer_user_zero_id(&id);
1301                 else {
1302                         timer = list_entry(snd_timer_list.next,
1303                                            struct snd_timer, device_list);
1304                         snd_timer_user_copy_id(&id, timer);
1305                 }
1306         } else {
1307                 switch (id.dev_class) {
1308                 case SNDRV_TIMER_CLASS_GLOBAL:
1309                         id.device = id.device < 0 ? 0 : id.device + 1;
1310                         list_for_each(p, &snd_timer_list) {
1311                                 timer = list_entry(p, struct snd_timer, device_list);
1312                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1313                                         snd_timer_user_copy_id(&id, timer);
1314                                         break;
1315                                 }
1316                                 if (timer->tmr_device >= id.device) {
1317                                         snd_timer_user_copy_id(&id, timer);
1318                                         break;
1319                                 }
1320                         }
1321                         if (p == &snd_timer_list)
1322                                 snd_timer_user_zero_id(&id);
1323                         break;
1324                 case SNDRV_TIMER_CLASS_CARD:
1325                 case SNDRV_TIMER_CLASS_PCM:
1326                         if (id.card < 0) {
1327                                 id.card = 0;
1328                         } else {
1329                                 if (id.card < 0) {
1330                                         id.card = 0;
1331                                 } else {
1332                                         if (id.device < 0) {
1333                                                 id.device = 0;
1334                                         } else {
1335                                                 if (id.subdevice < 0) {
1336                                                         id.subdevice = 0;
1337                                                 } else {
1338                                                         id.subdevice++;
1339                                                 }
1340                                         }
1341                                 }
1342                         }
1343                         list_for_each(p, &snd_timer_list) {
1344                                 timer = list_entry(p, struct snd_timer, device_list);
1345                                 if (timer->tmr_class > id.dev_class) {
1346                                         snd_timer_user_copy_id(&id, timer);
1347                                         break;
1348                                 }
1349                                 if (timer->tmr_class < id.dev_class)
1350                                         continue;
1351                                 if (timer->card->number > id.card) {
1352                                         snd_timer_user_copy_id(&id, timer);
1353                                         break;
1354                                 }
1355                                 if (timer->card->number < id.card)
1356                                         continue;
1357                                 if (timer->tmr_device > id.device) {
1358                                         snd_timer_user_copy_id(&id, timer);
1359                                         break;
1360                                 }
1361                                 if (timer->tmr_device < id.device)
1362                                         continue;
1363                                 if (timer->tmr_subdevice > id.subdevice) {
1364                                         snd_timer_user_copy_id(&id, timer);
1365                                         break;
1366                                 }
1367                                 if (timer->tmr_subdevice < id.subdevice)
1368                                         continue;
1369                                 snd_timer_user_copy_id(&id, timer);
1370                                 break;
1371                         }
1372                         if (p == &snd_timer_list)
1373                                 snd_timer_user_zero_id(&id);
1374                         break;
1375                 default:
1376                         snd_timer_user_zero_id(&id);
1377                 }
1378         }
1379         up(&register_mutex);
1380         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1381                 return -EFAULT;
1382         return 0;
1383 }
1384
1385 static int snd_timer_user_ginfo(struct file *file,
1386                                 struct snd_timer_ginfo __user *_ginfo)
1387 {
1388         struct snd_timer_ginfo *ginfo;
1389         struct snd_timer_id tid;
1390         struct snd_timer *t;
1391         struct list_head *p;
1392         int err = 0;
1393
1394         ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1395         if (! ginfo)
1396                 return -ENOMEM;
1397         if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1398                 kfree(ginfo);
1399                 return -EFAULT;
1400         }
1401         tid = ginfo->tid;
1402         memset(ginfo, 0, sizeof(*ginfo));
1403         ginfo->tid = tid;
1404         down(&register_mutex);
1405         t = snd_timer_find(&tid);
1406         if (t != NULL) {
1407                 ginfo->card = t->card ? t->card->number : -1;
1408                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1409                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1410                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1411                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1412                 ginfo->resolution = t->hw.resolution;
1413                 if (t->hw.resolution_min > 0) {
1414                         ginfo->resolution_min = t->hw.resolution_min;
1415                         ginfo->resolution_max = t->hw.resolution_max;
1416                 }
1417                 list_for_each(p, &t->open_list_head) {
1418                         ginfo->clients++;
1419                 }
1420         } else {
1421                 err = -ENODEV;
1422         }
1423         up(&register_mutex);
1424         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1425                 err = -EFAULT;
1426         kfree(ginfo);
1427         return err;
1428 }
1429
1430 static int snd_timer_user_gparams(struct file *file,
1431                                   struct snd_timer_gparams __user *_gparams)
1432 {
1433         struct snd_timer_gparams gparams;
1434         struct snd_timer *t;
1435         int err;
1436
1437         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1438                 return -EFAULT;
1439         down(&register_mutex);
1440         t = snd_timer_find(&gparams.tid);
1441         if (!t) {
1442                 err = -ENODEV;
1443                 goto _error;
1444         }
1445         if (!list_empty(&t->open_list_head)) {
1446                 err = -EBUSY;
1447                 goto _error;
1448         }
1449         if (!t->hw.set_period) {
1450                 err = -ENOSYS;
1451                 goto _error;
1452         }
1453         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1454 _error:
1455         up(&register_mutex);
1456         return err;
1457 }
1458
1459 static int snd_timer_user_gstatus(struct file *file,
1460                                   struct snd_timer_gstatus __user *_gstatus)
1461 {
1462         struct snd_timer_gstatus gstatus;
1463         struct snd_timer_id tid;
1464         struct snd_timer *t;
1465         int err = 0;
1466
1467         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1468                 return -EFAULT;
1469         tid = gstatus.tid;
1470         memset(&gstatus, 0, sizeof(gstatus));
1471         gstatus.tid = tid;
1472         down(&register_mutex);
1473         t = snd_timer_find(&tid);
1474         if (t != NULL) {
1475                 if (t->hw.c_resolution)
1476                         gstatus.resolution = t->hw.c_resolution(t);
1477                 else
1478                         gstatus.resolution = t->hw.resolution;
1479                 if (t->hw.precise_resolution) {
1480                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1481                                                  &gstatus.resolution_den);
1482                 } else {
1483                         gstatus.resolution_num = gstatus.resolution;
1484                         gstatus.resolution_den = 1000000000uL;
1485                 }
1486         } else {
1487                 err = -ENODEV;
1488         }
1489         up(&register_mutex);
1490         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1491                 err = -EFAULT;
1492         return err;
1493 }
1494
1495 static int snd_timer_user_tselect(struct file *file,
1496                                   struct snd_timer_select __user *_tselect)
1497 {
1498         struct snd_timer_user *tu;
1499         struct snd_timer_select tselect;
1500         char str[32];
1501         int err = 0;
1502
1503         tu = file->private_data;
1504         down(&tu->tread_sem);
1505         if (tu->timeri) {
1506                 snd_timer_close(tu->timeri);
1507                 tu->timeri = NULL;
1508         }
1509         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1510                 err = -EFAULT;
1511                 goto __err;
1512         }
1513         sprintf(str, "application %i", current->pid);
1514         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1515                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1516         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1517         if (err < 0)
1518                 goto __err;
1519
1520         kfree(tu->queue);
1521         tu->queue = NULL;
1522         kfree(tu->tqueue);
1523         tu->tqueue = NULL;
1524         if (tu->tread) {
1525                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1526                                      GFP_KERNEL);
1527                 if (tu->tqueue == NULL)
1528                         err = -ENOMEM;
1529         } else {
1530                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1531                                     GFP_KERNEL);
1532                 if (tu->queue == NULL)
1533                         err = -ENOMEM;
1534         }
1535
1536         if (err < 0) {
1537                 snd_timer_close(tu->timeri);
1538                 tu->timeri = NULL;
1539         } else {
1540                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1541                 tu->timeri->callback = tu->tread
1542                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1543                 tu->timeri->ccallback = snd_timer_user_ccallback;
1544                 tu->timeri->callback_data = (void *)tu;
1545         }
1546
1547       __err:
1548         up(&tu->tread_sem);
1549         return err;
1550 }
1551
1552 static int snd_timer_user_info(struct file *file,
1553                                struct snd_timer_info __user *_info)
1554 {
1555         struct snd_timer_user *tu;
1556         struct snd_timer_info *info;
1557         struct snd_timer *t;
1558         int err = 0;
1559
1560         tu = file->private_data;
1561         snd_assert(tu->timeri != NULL, return -ENXIO);
1562         t = tu->timeri->timer;
1563         snd_assert(t != NULL, return -ENXIO);
1564
1565         info = kzalloc(sizeof(*info), GFP_KERNEL);
1566         if (! info)
1567                 return -ENOMEM;
1568         info->card = t->card ? t->card->number : -1;
1569         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1570                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1571         strlcpy(info->id, t->id, sizeof(info->id));
1572         strlcpy(info->name, t->name, sizeof(info->name));
1573         info->resolution = t->hw.resolution;
1574         if (copy_to_user(_info, info, sizeof(*_info)))
1575                 err = -EFAULT;
1576         kfree(info);
1577         return err;
1578 }
1579
1580 static int snd_timer_user_params(struct file *file,
1581                                  struct snd_timer_params __user *_params)
1582 {
1583         struct snd_timer_user *tu;
1584         struct snd_timer_params params;
1585         struct snd_timer *t;
1586         struct snd_timer_read *tr;
1587         struct snd_timer_tread *ttr;
1588         int err;
1589
1590         tu = file->private_data;
1591         snd_assert(tu->timeri != NULL, return -ENXIO);
1592         t = tu->timeri->timer;
1593         snd_assert(t != NULL, return -ENXIO);
1594         if (copy_from_user(&params, _params, sizeof(params)))
1595                 return -EFAULT;
1596         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1597                 err = -EINVAL;
1598                 goto _end;
1599         }
1600         if (params.queue_size > 0 &&
1601             (params.queue_size < 32 || params.queue_size > 1024)) {
1602                 err = -EINVAL;
1603                 goto _end;
1604         }
1605         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1606                               (1<<SNDRV_TIMER_EVENT_TICK)|
1607                               (1<<SNDRV_TIMER_EVENT_START)|
1608                               (1<<SNDRV_TIMER_EVENT_STOP)|
1609                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1610                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1611                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1612                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1613                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1614                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1615                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1616                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1617                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1618                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1619                 err = -EINVAL;
1620                 goto _end;
1621         }
1622         snd_timer_stop(tu->timeri);
1623         spin_lock_irq(&t->lock);
1624         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1625                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1626                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1627         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1628                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1629         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1630                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1631         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1632                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1633         spin_unlock_irq(&t->lock);
1634         if (params.queue_size > 0 &&
1635             (unsigned int)tu->queue_size != params.queue_size) {
1636                 if (tu->tread) {
1637                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1638                                       GFP_KERNEL);
1639                         if (ttr) {
1640                                 kfree(tu->tqueue);
1641                                 tu->queue_size = params.queue_size;
1642                                 tu->tqueue = ttr;
1643                         }
1644                 } else {
1645                         tr = kmalloc(params.queue_size * sizeof(*tr),
1646                                      GFP_KERNEL);
1647                         if (tr) {
1648                                 kfree(tu->queue);
1649                                 tu->queue_size = params.queue_size;
1650                                 tu->queue = tr;
1651                         }
1652                 }
1653         }
1654         tu->qhead = tu->qtail = tu->qused = 0;
1655         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1656                 if (tu->tread) {
1657                         struct snd_timer_tread tread;
1658                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1659                         tread.tstamp.tv_sec = 0;
1660                         tread.tstamp.tv_nsec = 0;
1661                         tread.val = 0;
1662                         snd_timer_user_append_to_tqueue(tu, &tread);
1663                 } else {
1664                         struct snd_timer_read *r = &tu->queue[0];
1665                         r->resolution = 0;
1666                         r->ticks = 0;
1667                         tu->qused++;
1668                         tu->qtail++;
1669                 }
1670         }
1671         tu->filter = params.filter;
1672         tu->ticks = params.ticks;
1673         err = 0;
1674  _end:
1675         if (copy_to_user(_params, &params, sizeof(params)))
1676                 return -EFAULT;
1677         return err;
1678 }
1679
1680 static int snd_timer_user_status(struct file *file,
1681                                  struct snd_timer_status __user *_status)
1682 {
1683         struct snd_timer_user *tu;
1684         struct snd_timer_status status;
1685
1686         tu = file->private_data;
1687         snd_assert(tu->timeri != NULL, return -ENXIO);
1688         memset(&status, 0, sizeof(status));
1689         status.tstamp = tu->tstamp;
1690         status.resolution = snd_timer_resolution(tu->timeri);
1691         status.lost = tu->timeri->lost;
1692         status.overrun = tu->overrun;
1693         spin_lock_irq(&tu->qlock);
1694         status.queue = tu->qused;
1695         spin_unlock_irq(&tu->qlock);
1696         if (copy_to_user(_status, &status, sizeof(status)))
1697                 return -EFAULT;
1698         return 0;
1699 }
1700
1701 static int snd_timer_user_start(struct file *file)
1702 {
1703         int err;
1704         struct snd_timer_user *tu;
1705
1706         tu = file->private_data;
1707         snd_assert(tu->timeri != NULL, return -ENXIO);
1708         snd_timer_stop(tu->timeri);
1709         tu->timeri->lost = 0;
1710         tu->last_resolution = 0;
1711         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1712 }
1713
1714 static int snd_timer_user_stop(struct file *file)
1715 {
1716         int err;
1717         struct snd_timer_user *tu;
1718
1719         tu = file->private_data;
1720         snd_assert(tu->timeri != NULL, return -ENXIO);
1721         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1722 }
1723
1724 static int snd_timer_user_continue(struct file *file)
1725 {
1726         int err;
1727         struct snd_timer_user *tu;
1728
1729         tu = file->private_data;
1730         snd_assert(tu->timeri != NULL, return -ENXIO);
1731         tu->timeri->lost = 0;
1732         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1733 }
1734
1735 static int snd_timer_user_pause(struct file *file)
1736 {
1737         int err;
1738         struct snd_timer_user *tu;
1739
1740         tu = file->private_data;
1741         snd_assert(tu->timeri != NULL, return -ENXIO);
1742         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1743 }
1744
1745 enum {
1746         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1747         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1748         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1749         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1750 };
1751
1752 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1753                                  unsigned long arg)
1754 {
1755         struct snd_timer_user *tu;
1756         void __user *argp = (void __user *)arg;
1757         int __user *p = argp;
1758
1759         tu = file->private_data;
1760         switch (cmd) {
1761         case SNDRV_TIMER_IOCTL_PVERSION:
1762                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1763         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1764                 return snd_timer_user_next_device(argp);
1765         case SNDRV_TIMER_IOCTL_TREAD:
1766         {
1767                 int xarg;
1768
1769                 down(&tu->tread_sem);
1770                 if (tu->timeri) {       /* too late */
1771                         up(&tu->tread_sem);
1772                         return -EBUSY;
1773                 }
1774                 if (get_user(xarg, p)) {
1775                         up(&tu->tread_sem);
1776                         return -EFAULT;
1777                 }
1778                 tu->tread = xarg ? 1 : 0;
1779                 up(&tu->tread_sem);
1780                 return 0;
1781         }
1782         case SNDRV_TIMER_IOCTL_GINFO:
1783                 return snd_timer_user_ginfo(file, argp);
1784         case SNDRV_TIMER_IOCTL_GPARAMS:
1785                 return snd_timer_user_gparams(file, argp);
1786         case SNDRV_TIMER_IOCTL_GSTATUS:
1787                 return snd_timer_user_gstatus(file, argp);
1788         case SNDRV_TIMER_IOCTL_SELECT:
1789                 return snd_timer_user_tselect(file, argp);
1790         case SNDRV_TIMER_IOCTL_INFO:
1791                 return snd_timer_user_info(file, argp);
1792         case SNDRV_TIMER_IOCTL_PARAMS:
1793                 return snd_timer_user_params(file, argp);
1794         case SNDRV_TIMER_IOCTL_STATUS:
1795                 return snd_timer_user_status(file, argp);
1796         case SNDRV_TIMER_IOCTL_START:
1797         case SNDRV_TIMER_IOCTL_START_OLD:
1798                 return snd_timer_user_start(file);
1799         case SNDRV_TIMER_IOCTL_STOP:
1800         case SNDRV_TIMER_IOCTL_STOP_OLD:
1801                 return snd_timer_user_stop(file);
1802         case SNDRV_TIMER_IOCTL_CONTINUE:
1803         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1804                 return snd_timer_user_continue(file);
1805         case SNDRV_TIMER_IOCTL_PAUSE:
1806         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1807                 return snd_timer_user_pause(file);
1808         }
1809         return -ENOTTY;
1810 }
1811
1812 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1813 {
1814         struct snd_timer_user *tu;
1815         int err;
1816
1817         tu = file->private_data;
1818         err = fasync_helper(fd, file, on, &tu->fasync);
1819         if (err < 0)
1820                 return err;
1821         return 0;
1822 }
1823
1824 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1825                                    size_t count, loff_t *offset)
1826 {
1827         struct snd_timer_user *tu;
1828         long result = 0, unit;
1829         int err = 0;
1830
1831         tu = file->private_data;
1832         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1833         spin_lock_irq(&tu->qlock);
1834         while ((long)count - result >= unit) {
1835                 while (!tu->qused) {
1836                         wait_queue_t wait;
1837
1838                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1839                                 err = -EAGAIN;
1840                                 break;
1841                         }
1842
1843                         set_current_state(TASK_INTERRUPTIBLE);
1844                         init_waitqueue_entry(&wait, current);
1845                         add_wait_queue(&tu->qchange_sleep, &wait);
1846
1847                         spin_unlock_irq(&tu->qlock);
1848                         schedule();
1849                         spin_lock_irq(&tu->qlock);
1850
1851                         remove_wait_queue(&tu->qchange_sleep, &wait);
1852
1853                         if (signal_pending(current)) {
1854                                 err = -ERESTARTSYS;
1855                                 break;
1856                         }
1857                 }
1858
1859                 spin_unlock_irq(&tu->qlock);
1860                 if (err < 0)
1861                         goto _error;
1862
1863                 if (tu->tread) {
1864                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1865                                          sizeof(struct snd_timer_tread))) {
1866                                 err = -EFAULT;
1867                                 goto _error;
1868                         }
1869                 } else {
1870                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1871                                          sizeof(struct snd_timer_read))) {
1872                                 err = -EFAULT;
1873                                 goto _error;
1874                         }
1875                 }
1876
1877                 tu->qhead %= tu->queue_size;
1878
1879                 result += unit;
1880                 buffer += unit;
1881
1882                 spin_lock_irq(&tu->qlock);
1883                 tu->qused--;
1884         }
1885         spin_unlock_irq(&tu->qlock);
1886  _error:
1887         return result > 0 ? result : err;
1888 }
1889
1890 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1891 {
1892         unsigned int mask;
1893         struct snd_timer_user *tu;
1894
1895         tu = file->private_data;
1896
1897         poll_wait(file, &tu->qchange_sleep, wait);
1898
1899         mask = 0;
1900         if (tu->qused)
1901                 mask |= POLLIN | POLLRDNORM;
1902
1903         return mask;
1904 }
1905
1906 #ifdef CONFIG_COMPAT
1907 #include "timer_compat.c"
1908 #else
1909 #define snd_timer_user_ioctl_compat     NULL
1910 #endif
1911
1912 static struct file_operations snd_timer_f_ops =
1913 {
1914         .owner =        THIS_MODULE,
1915         .read =         snd_timer_user_read,
1916         .open =         snd_timer_user_open,
1917         .release =      snd_timer_user_release,
1918         .poll =         snd_timer_user_poll,
1919         .unlocked_ioctl =       snd_timer_user_ioctl,
1920         .compat_ioctl = snd_timer_user_ioctl_compat,
1921         .fasync =       snd_timer_user_fasync,
1922 };
1923
1924 static struct snd_minor snd_timer_reg =
1925 {
1926         .comment =      "timer",
1927         .f_ops =        &snd_timer_f_ops,
1928 };
1929
1930 /*
1931  *  ENTRY functions
1932  */
1933
1934 static struct snd_info_entry *snd_timer_proc_entry = NULL;
1935
1936 static int __init alsa_timer_init(void)
1937 {
1938         int err;
1939         struct snd_info_entry *entry;
1940
1941 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1942         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1943                               "system timer");
1944 #endif
1945         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1946         if (entry != NULL) {
1947                 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1948                 entry->c.text.read = snd_timer_proc_read;
1949                 if (snd_info_register(entry) < 0) {
1950                         snd_info_free_entry(entry);
1951                         entry = NULL;
1952                 }
1953         }
1954         snd_timer_proc_entry = entry;
1955         if ((err = snd_timer_register_system()) < 0)
1956                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1957                            err);
1958         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1959                                         NULL, 0, &snd_timer_reg, "timer"))<0)
1960                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1961                            err);
1962         return 0;
1963 }
1964
1965 static void __exit alsa_timer_exit(void)
1966 {
1967         struct list_head *p, *n;
1968
1969         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1970         /* unregister the system timer */
1971         list_for_each_safe(p, n, &snd_timer_list) {
1972                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1973                 snd_timer_unregister(timer);
1974         }
1975         if (snd_timer_proc_entry) {
1976                 snd_info_unregister(snd_timer_proc_entry);
1977                 snd_timer_proc_entry = NULL;
1978         }
1979 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1980         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1981 #endif
1982 }
1983
1984 module_init(alsa_timer_init)
1985 module_exit(alsa_timer_exit)
1986
1987 EXPORT_SYMBOL(snd_timer_open);
1988 EXPORT_SYMBOL(snd_timer_close);
1989 EXPORT_SYMBOL(snd_timer_resolution);
1990 EXPORT_SYMBOL(snd_timer_start);
1991 EXPORT_SYMBOL(snd_timer_stop);
1992 EXPORT_SYMBOL(snd_timer_continue);
1993 EXPORT_SYMBOL(snd_timer_pause);
1994 EXPORT_SYMBOL(snd_timer_new);
1995 EXPORT_SYMBOL(snd_timer_notify);
1996 EXPORT_SYMBOL(snd_timer_global_new);
1997 EXPORT_SYMBOL(snd_timer_global_free);
1998 EXPORT_SYMBOL(snd_timer_global_register);
1999 EXPORT_SYMBOL(snd_timer_global_unregister);
2000 EXPORT_SYMBOL(snd_timer_interrupt);