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