git.oblomov.eu Git - linux-2.6/blob - sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/delay.h>
  24 #include <linux/init.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/mutex.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/string.h>
  31 #include <sound/core.h>
  32 #include <sound/timer.h>
  33 #include <sound/control.h>
  34 #include <sound/info.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37 #include <linux/kmod.h>
  38 #ifdef CONFIG_KERNELD
  39 #include <linux/kerneld.h>
  40 #endif
  41
  42 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
  43 #define DEFAULT_TIMER_LIMIT 3
  44 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
  45 #define DEFAULT_TIMER_LIMIT 2
  46 #else
  47 #define DEFAULT_TIMER_LIMIT 1
  48 #endif
  49
  50 static int timer_limit = DEFAULT_TIMER_LIMIT;
  51 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
  52 MODULE_DESCRIPTION("ALSA timer interface");
  53 MODULE_LICENSE("GPL");
  54 module_param(timer_limit, int, 0444);
  55 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  56
  57 struct snd_timer_user {
  58         struct snd_timer_instance *timeri;
  59         int tread;              /* enhanced read with timestamps and events */
  60         unsigned long ticks;
  61         unsigned long overrun;
  62         int qhead;
  63         int qtail;
  64         int qused;
  65         int queue_size;
  66         struct snd_timer_read *queue;
  67         struct snd_timer_tread *tqueue;
  68         spinlock_t qlock;
  69         unsigned long last_resolution;
  70         unsigned int filter;
  71         struct timespec tstamp;         /* trigger tstamp */
  72         wait_queue_head_t qchange_sleep;
  73         struct fasync_struct *fasync;
  74         struct mutex tread_sem;
  75 };
  76
  77 /* list of timers */
  78 static LIST_HEAD(snd_timer_list);
  79
  80 /* list of slave instances */
  81 static LIST_HEAD(snd_timer_slave_list);
  82
  83 /* lock for slave active lists */
  84 static DEFINE_SPINLOCK(slave_active_lock);
  85
  86 static DEFINE_MUTEX(register_mutex);
  87
  88 static int snd_timer_free(struct snd_timer *timer);
  89 static int snd_timer_dev_free(struct snd_device *device);
  90 static int snd_timer_dev_register(struct snd_device *device);
  91 static int snd_timer_dev_unregister(struct snd_device *device);
  92
  93 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  94
  95 /*
  96  * create a timer instance with the given owner string.
  97  * when timer is not NULL, increments the module counter
  98  */
  99 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 100                                                          struct snd_timer *timer)
 101 {
 102         struct snd_timer_instance *timeri;
 103         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 104         if (timeri == NULL)
 105                 return NULL;
 106         timeri->owner = kstrdup(owner, GFP_KERNEL);
 107         if (! timeri->owner) {
 108                 kfree(timeri);
 109                 return NULL;
 110         }
 111         INIT_LIST_HEAD(&timeri->open_list);
 112         INIT_LIST_HEAD(&timeri->active_list);
 113         INIT_LIST_HEAD(&timeri->ack_list);
 114         INIT_LIST_HEAD(&timeri->slave_list_head);
 115         INIT_LIST_HEAD(&timeri->slave_active_head);
 116
 117         timeri->timer = timer;
 118         if (timer && !try_module_get(timer->module)) {
 119                 kfree(timeri->owner);
 120                 kfree(timeri);
 121                 return NULL;
 122         }
 123
 124         return timeri;
 125 }
 126
 127 /*
 128  * find a timer instance from the given timer id
 129  */
 130 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 131 {
 132         struct snd_timer *timer = NULL;
 133         struct list_head *p;
 134
 135         list_for_each(p, &snd_timer_list) {
 136                 timer = list_entry(p, struct snd_timer, device_list);
 137
 138                 if (timer->tmr_class != tid->dev_class)
 139                         continue;
 140                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 141                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 142                     (timer->card == NULL ||
 143                      timer->card->number != tid->card))
 144                         continue;
 145                 if (timer->tmr_device != tid->device)
 146                         continue;
 147                 if (timer->tmr_subdevice != tid->subdevice)
 148                         continue;
 149                 return timer;
 150         }
 151         return NULL;
 152 }
 153
 154 #ifdef CONFIG_KMOD
 155
 156 static void snd_timer_request(struct snd_timer_id *tid)
 157 {
 158         if (! current->fs->root)
 159                 return;
 160         switch (tid->dev_class) {
 161         case SNDRV_TIMER_CLASS_GLOBAL:
 162                 if (tid->device < timer_limit)
 163                         request_module("snd-timer-%i", tid->device);
 164                 break;
 165         case SNDRV_TIMER_CLASS_CARD:
 166         case SNDRV_TIMER_CLASS_PCM:
 167                 if (tid->card < snd_ecards_limit)
 168                         request_module("snd-card-%i", tid->card);
 169                 break;
 170         default:
 171                 break;
 172         }
 173 }
 174
 175 #endif
 176
 177 /*
 178  * look for a master instance matching with the slave id of the given slave.
 179  * when found, relink the open_link of the slave.
 180  *
 181  * call this with register_mutex down.
 182  */
 183 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 184 {
 185         struct snd_timer *timer;
 186         struct snd_timer_instance *master;
 187         struct list_head *p, *q;
 188
 189         /* FIXME: it's really dumb to look up all entries.. */
 190         list_for_each(p, &snd_timer_list) {
 191                 timer = list_entry(p, struct snd_timer, device_list);
 192                 list_for_each(q, &timer->open_list_head) {
 193                         master = list_entry(q, struct snd_timer_instance, open_list);
 194                         if (slave->slave_class == master->slave_class &&
 195                             slave->slave_id == master->slave_id) {
 196                                 list_del(&slave->open_list);
 197                                 list_add_tail(&slave->open_list,
 198                                               &master->slave_list_head);
 199                                 spin_lock_irq(&slave_active_lock);
 200                                 slave->master = master;
 201                                 slave->timer = master->timer;
 202                                 spin_unlock_irq(&slave_active_lock);
 203                                 return;
 204                         }
 205                 }
 206         }
 207 }
 208
 209 /*
 210  * look for slave instances matching with the slave id of the given master.
 211  * when found, relink the open_link of slaves.
 212  *
 213  * call this with register_mutex down.
 214  */
 215 static void snd_timer_check_master(struct snd_timer_instance *master)
 216 {
 217         struct snd_timer_instance *slave;
 218         struct list_head *p, *n;
 219
 220         /* check all pending slaves */
 221         list_for_each_safe(p, n, &snd_timer_slave_list) {
 222                 slave = list_entry(p, struct snd_timer_instance, open_list);
 223                 if (slave->slave_class == master->slave_class &&
 224                     slave->slave_id == master->slave_id) {
 225                         list_del(p);
 226                         list_add_tail(p, &master->slave_list_head);
 227                         spin_lock_irq(&slave_active_lock);
 228                         slave->master = master;
 229                         slave->timer = master->timer;
 230                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 231                                 list_add_tail(&slave->active_list,
 232                                               &master->slave_active_head);
 233                         spin_unlock_irq(&slave_active_lock);
 234                 }
 235         }
 236 }
 237
 238 /*
 239  * open a timer instance
 240  * when opening a master, the slave id must be here given.
 241  */
 242 int snd_timer_open(struct snd_timer_instance **ti,
 243                    char *owner, struct snd_timer_id *tid,
 244                    unsigned int slave_id)
 245 {
 246         struct snd_timer *timer;
 247         struct snd_timer_instance *timeri = NULL;
 248
 249         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 250                 /* open a slave instance */
 251                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 252                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 253                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
 254                         return -EINVAL;
 255                 }
 256                 mutex_lock(&register_mutex);
 257                 timeri = snd_timer_instance_new(owner, NULL);
 258                 if (!timeri) {
 259                         mutex_unlock(&register_mutex);
 260                         return -ENOMEM;
 261                 }
 262                 timeri->slave_class = tid->dev_sclass;
 263                 timeri->slave_id = tid->device;
 264                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 265                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 266                 snd_timer_check_slave(timeri);
 267                 mutex_unlock(&register_mutex);
 268                 *ti = timeri;
 269                 return 0;
 270         }
 271
 272         /* open a master instance */
 273         mutex_lock(&register_mutex);
 274         timer = snd_timer_find(tid);
 275 #ifdef CONFIG_KMOD
 276         if (timer == NULL) {
 277                 mutex_unlock(&register_mutex);
 278                 snd_timer_request(tid);
 279                 mutex_lock(&register_mutex);
 280                 timer = snd_timer_find(tid);
 281         }
 282 #endif
 283         if (!timer) {
 284                 mutex_unlock(&register_mutex);
 285                 return -ENODEV;
 286         }
 287         if (!list_empty(&timer->open_list_head)) {
 288                 timeri = list_entry(timer->open_list_head.next,
 289                                     struct snd_timer_instance, open_list);
 290                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 291                         mutex_unlock(&register_mutex);
 292                         return -EBUSY;
 293                 }
 294         }
 295         timeri = snd_timer_instance_new(owner, timer);
 296         if (!timeri) {
 297                 mutex_unlock(&register_mutex);
 298                 return -ENOMEM;
 299         }
 300         timeri->slave_class = tid->dev_sclass;
 301         timeri->slave_id = slave_id;
 302         if (list_empty(&timer->open_list_head) && timer->hw.open)
 303                 timer->hw.open(timer);
 304         list_add_tail(&timeri->open_list, &timer->open_list_head);
 305         snd_timer_check_master(timeri);
 306         mutex_unlock(&register_mutex);
 307         *ti = timeri;
 308         return 0;
 309 }
 310
 311 static int _snd_timer_stop(struct snd_timer_instance *timeri,
 312                            int keep_flag, int event);
 313
 314 /*
 315  * close a timer instance
 316  */
 317 int snd_timer_close(struct snd_timer_instance *timeri)
 318 {
 319         struct snd_timer *timer = NULL;
 320         struct list_head *p, *n;
 321         struct snd_timer_instance *slave;
 322
 323         snd_assert(timeri != NULL, return -ENXIO);
 324
 325         /* force to stop the timer */
 326         snd_timer_stop(timeri);
 327
 328         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 329                 /* wait, until the active callback is finished */
 330                 spin_lock_irq(&slave_active_lock);
 331                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 332                         spin_unlock_irq(&slave_active_lock);
 333                         udelay(10);
 334                         spin_lock_irq(&slave_active_lock);
 335                 }
 336                 spin_unlock_irq(&slave_active_lock);
 337                 mutex_lock(&register_mutex);
 338                 list_del(&timeri->open_list);
 339                 mutex_unlock(&register_mutex);
 340         } else {
 341                 timer = timeri->timer;
 342                 /* wait, until the active callback is finished */
 343                 spin_lock_irq(&timer->lock);
 344                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 345                         spin_unlock_irq(&timer->lock);
 346                         udelay(10);
 347                         spin_lock_irq(&timer->lock);
 348                 }
 349                 spin_unlock_irq(&timer->lock);
 350                 mutex_lock(&register_mutex);
 351                 list_del(&timeri->open_list);
 352                 if (timer && list_empty(&timer->open_list_head) &&
 353                     timer->hw.close)
 354                         timer->hw.close(timer);
 355                 /* remove slave links */
 356                 list_for_each_safe(p, n, &timeri->slave_list_head) {
 357                         slave = list_entry(p, struct snd_timer_instance, open_list);
 358                         spin_lock_irq(&slave_active_lock);
 359                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
 360                         list_del(p);
 361                         list_add_tail(p, &snd_timer_slave_list);
 362                         slave->master = NULL;
 363                         slave->timer = NULL;
 364                         spin_unlock_irq(&slave_active_lock);
 365                 }
 366                 mutex_unlock(&register_mutex);
 367         }
 368         if (timeri->private_free)
 369                 timeri->private_free(timeri);
 370         kfree(timeri->owner);
 371         kfree(timeri);
 372         if (timer)
 373                 module_put(timer->module);
 374         return 0;
 375 }
 376
 377 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 378 {
 379         struct snd_timer * timer;
 380
 381         if (timeri == NULL)
 382                 return 0;
 383         if ((timer = timeri->timer) != NULL) {
 384                 if (timer->hw.c_resolution)
 385                         return timer->hw.c_resolution(timer);
 386                 return timer->hw.resolution;
 387         }
 388         return 0;
 389 }
 390
 391 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 392 {
 393         struct snd_timer *timer;
 394         unsigned long flags;
 395         unsigned long resolution = 0;
 396         struct snd_timer_instance *ts;
 397         struct list_head *n;
 398         struct timespec tstamp;
 399
 400         getnstimeofday(&tstamp);
 401         snd_assert(event >= SNDRV_TIMER_EVENT_START &&
 402                    event <= SNDRV_TIMER_EVENT_PAUSE, return);
 403         if (event == SNDRV_TIMER_EVENT_START ||
 404             event == SNDRV_TIMER_EVENT_CONTINUE)
 405                 resolution = snd_timer_resolution(ti);
 406         if (ti->ccallback)
 407                 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
 408         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 409                 return;
 410         timer = ti->timer;
 411         if (timer == NULL)
 412                 return;
 413         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 414                 return;
 415         spin_lock_irqsave(&timer->lock, flags);
 416         list_for_each(n, &ti->slave_active_head) {
 417                 ts = list_entry(n, struct snd_timer_instance, active_list);
 418                 if (ts->ccallback)
 419                         ts->ccallback(ti, event + 100, &tstamp, resolution);
 420         }
 421         spin_unlock_irqrestore(&timer->lock, flags);
 422 }
 423
 424 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
 425                             unsigned long sticks)
 426 {
 427         list_del(&timeri->active_list);
 428         list_add_tail(&timeri->active_list, &timer->active_list_head);
 429         if (timer->running) {
 430                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 431                         goto __start_now;
 432                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 433                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 434                 return 1;       /* delayed start */
 435         } else {
 436                 timer->sticks = sticks;
 437                 timer->hw.start(timer);
 438               __start_now:
 439                 timer->running++;
 440                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 441                 return 0;
 442         }
 443 }
 444
 445 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
 446 {
 447         unsigned long flags;
 448
 449         spin_lock_irqsave(&slave_active_lock, flags);
 450         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 451         if (timeri->master)
 452                 list_add_tail(&timeri->active_list,
 453                               &timeri->master->slave_active_head);
 454         spin_unlock_irqrestore(&slave_active_lock, flags);
 455         return 1; /* delayed start */
 456 }
 457
 458 /*
 459  *  start the timer instance
 460  */
 461 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 462 {
 463         struct snd_timer *timer;
 464         int result = -EINVAL;
 465         unsigned long flags;
 466
 467         if (timeri == NULL || ticks < 1)
 468                 return -EINVAL;
 469         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 470                 result = snd_timer_start_slave(timeri);
 471                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 472                 return result;
 473         }
 474         timer = timeri->timer;
 475         if (timer == NULL)
 476                 return -EINVAL;
 477         spin_lock_irqsave(&timer->lock, flags);
 478         timeri->ticks = timeri->cticks = ticks;
 479         timeri->pticks = 0;
 480         result = snd_timer_start1(timer, timeri, ticks);
 481         spin_unlock_irqrestore(&timer->lock, flags);
 482         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 483         return result;
 484 }
 485
 486 static int _snd_timer_stop(struct snd_timer_instance * timeri,
 487                            int keep_flag, int event)
 488 {
 489         struct snd_timer *timer;
 490         unsigned long flags;
 491
 492         snd_assert(timeri != NULL, return -ENXIO);
 493
 494         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 495                 if (!keep_flag) {
 496                         spin_lock_irqsave(&slave_active_lock, flags);
 497                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 498                         spin_unlock_irqrestore(&slave_active_lock, flags);
 499                 }
 500                 goto __end;
 501         }
 502         timer = timeri->timer;
 503         if (!timer)
 504                 return -EINVAL;
 505         spin_lock_irqsave(&timer->lock, flags);
 506         list_del_init(&timeri->ack_list);
 507         list_del_init(&timeri->active_list);
 508         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 509             !(--timer->running)) {
 510                 timer->hw.stop(timer);
 511                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 512                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 513                         snd_timer_reschedule(timer, 0);
 514                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 515                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 516                                 timer->hw.start(timer);
 517                         }
 518                 }
 519         }
 520         if (!keep_flag)
 521                 timeri->flags &=
 522                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 523         spin_unlock_irqrestore(&timer->lock, flags);
 524       __end:
 525         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 526                 snd_timer_notify1(timeri, event);
 527         return 0;
 528 }
 529
 530 /*
 531  * stop the timer instance.
 532  *
 533  * do not call this from the timer callback!
 534  */
 535 int snd_timer_stop(struct snd_timer_instance *timeri)
 536 {
 537         struct snd_timer *timer;
 538         unsigned long flags;
 539         int err;
 540
 541         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
 542         if (err < 0)
 543                 return err;
 544         timer = timeri->timer;
 545         spin_lock_irqsave(&timer->lock, flags);
 546         timeri->cticks = timeri->ticks;
 547         timeri->pticks = 0;
 548         spin_unlock_irqrestore(&timer->lock, flags);
 549         return 0;
 550 }
 551
 552 /*
 553  * start again..  the tick is kept.
 554  */
 555 int snd_timer_continue(struct snd_timer_instance *timeri)
 556 {
 557         struct snd_timer *timer;
 558         int result = -EINVAL;
 559         unsigned long flags;
 560
 561         if (timeri == NULL)
 562                 return result;
 563         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 564                 return snd_timer_start_slave(timeri);
 565         timer = timeri->timer;
 566         if (! timer)
 567                 return -EINVAL;
 568         spin_lock_irqsave(&timer->lock, flags);
 569         if (!timeri->cticks)
 570                 timeri->cticks = 1;
 571         timeri->pticks = 0;
 572         result = snd_timer_start1(timer, timeri, timer->sticks);
 573         spin_unlock_irqrestore(&timer->lock, flags);
 574         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
 575         return result;
 576 }
 577
 578 /*
 579  * pause.. remember the ticks left
 580  */
 581 int snd_timer_pause(struct snd_timer_instance * timeri)
 582 {
 583         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
 584 }
 585
 586 /*
 587  * reschedule the timer
 588  *
 589  * start pending instances and check the scheduling ticks.
 590  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 591  */
 592 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 593 {
 594         struct snd_timer_instance *ti;
 595         unsigned long ticks = ~0UL;
 596         struct list_head *p;
 597
 598         list_for_each(p, &timer->active_list_head) {
 599                 ti = list_entry(p, struct snd_timer_instance, active_list);
 600                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 601                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 602                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 603                         timer->running++;
 604                 }
 605                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 606                         if (ticks > ti->cticks)
 607                                 ticks = ti->cticks;
 608                 }
 609         }
 610         if (ticks == ~0UL) {
 611                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 612                 return;
 613         }
 614         if (ticks > timer->hw.ticks)
 615                 ticks = timer->hw.ticks;
 616         if (ticks_left != ticks)
 617                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 618         timer->sticks = ticks;
 619 }
 620
 621 /*
 622  * timer tasklet
 623  *
 624  */
 625 static void snd_timer_tasklet(unsigned long arg)
 626 {
 627         struct snd_timer *timer = (struct snd_timer *) arg;
 628         struct snd_timer_instance *ti;
 629         struct list_head *p;
 630         unsigned long resolution, ticks;
 631
 632         spin_lock(&timer->lock);
 633         /* now process all callbacks */
 634         while (!list_empty(&timer->sack_list_head)) {
 635                 p = timer->sack_list_head.next;         /* get first item */
 636                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 637
 638                 /* remove from ack_list and make empty */
 639                 list_del_init(p);
 640
 641                 ticks = ti->pticks;
 642                 ti->pticks = 0;
 643                 resolution = ti->resolution;
 644
 645                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 646                 spin_unlock(&timer->lock);
 647                 if (ti->callback)
 648                         ti->callback(ti, resolution, ticks);
 649                 spin_lock(&timer->lock);
 650                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 651         }
 652         spin_unlock(&timer->lock);
 653 }
 654
 655 /*
 656  * timer interrupt
 657  *
 658  * ticks_left is usually equal to timer->sticks.
 659  *
 660  */
 661 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 662 {
 663         struct snd_timer_instance *ti, *ts;
 664         unsigned long resolution, ticks;
 665         struct list_head *p, *q, *n, *ack_list_head;
 666         unsigned long flags;
 667         int use_tasklet = 0;
 668
 669         if (timer == NULL)
 670                 return;
 671
 672         spin_lock_irqsave(&timer->lock, flags);
 673
 674         /* remember the current resolution */
 675         if (timer->hw.c_resolution)
 676                 resolution = timer->hw.c_resolution(timer);
 677         else
 678                 resolution = timer->hw.resolution;
 679
 680         /* loop for all active instances
 681          * Here we cannot use list_for_each because the active_list of a
 682          * processed instance is relinked to done_list_head before the callback
 683          * is called.
 684          */
 685         list_for_each_safe(p, n, &timer->active_list_head) {
 686                 ti = list_entry(p, struct snd_timer_instance, active_list);
 687                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 688                         continue;
 689                 ti->pticks += ticks_left;
 690                 ti->resolution = resolution;
 691                 if (ti->cticks < ticks_left)
 692                         ti->cticks = 0;
 693                 else
 694                         ti->cticks -= ticks_left;
 695                 if (ti->cticks) /* not expired */
 696                         continue;
 697                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 698                         ti->cticks = ti->ticks;
 699                 } else {
 700                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 701                         if (--timer->running)
 702                                 list_del(p);
 703                 }
 704                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 705                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 706                         ack_list_head = &timer->ack_list_head;
 707                 else
 708                         ack_list_head = &timer->sack_list_head;
 709                 if (list_empty(&ti->ack_list))
 710                         list_add_tail(&ti->ack_list, ack_list_head);
 711                 list_for_each(q, &ti->slave_active_head) {
 712                         ts = list_entry(q, struct snd_timer_instance, active_list);
 713                         ts->pticks = ti->pticks;
 714                         ts->resolution = resolution;
 715                         if (list_empty(&ts->ack_list))
 716                                 list_add_tail(&ts->ack_list, ack_list_head);
 717                 }
 718         }
 719         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 720                 snd_timer_reschedule(timer, ticks_left);
 721         if (timer->running) {
 722                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 723                         timer->hw.stop(timer);
 724                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 725                 }
 726                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 727                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 728                         /* restart timer */
 729                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 730                         timer->hw.start(timer);
 731                 }
 732         } else {
 733                 timer->hw.stop(timer);
 734         }
 735
 736         /* now process all fast callbacks */
 737         while (!list_empty(&timer->ack_list_head)) {
 738                 p = timer->ack_list_head.next;          /* get first item */
 739                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 740
 741                 /* remove from ack_list and make empty */
 742                 list_del_init(p);
 743
 744                 ticks = ti->pticks;
 745                 ti->pticks = 0;
 746
 747                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 748                 spin_unlock(&timer->lock);
 749                 if (ti->callback)
 750                         ti->callback(ti, resolution, ticks);
 751                 spin_lock(&timer->lock);
 752                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 753         }
 754
 755         /* do we have any slow callbacks? */
 756         use_tasklet = !list_empty(&timer->sack_list_head);
 757         spin_unlock_irqrestore(&timer->lock, flags);
 758
 759         if (use_tasklet)
 760                 tasklet_hi_schedule(&timer->task_queue);
 761 }
 762
 763 /*
 764
 765  */
 766
 767 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 768                   struct snd_timer **rtimer)
 769 {
 770         struct snd_timer *timer;
 771         int err;
 772         static struct snd_device_ops ops = {
 773                 .dev_free = snd_timer_dev_free,
 774                 .dev_register = snd_timer_dev_register,
 775                 .dev_unregister = snd_timer_dev_unregister
 776         };
 777
 778         snd_assert(tid != NULL, return -EINVAL);
 779         snd_assert(rtimer != NULL, return -EINVAL);
 780         *rtimer = NULL;
 781         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 782         if (timer == NULL) {
 783                 snd_printk(KERN_ERR "timer: cannot allocate\n");
 784                 return -ENOMEM;
 785         }
 786         timer->tmr_class = tid->dev_class;
 787         timer->card = card;
 788         timer->tmr_device = tid->device;
 789         timer->tmr_subdevice = tid->subdevice;
 790         if (id)
 791                 strlcpy(timer->id, id, sizeof(timer->id));
 792         INIT_LIST_HEAD(&timer->device_list);
 793         INIT_LIST_HEAD(&timer->open_list_head);
 794         INIT_LIST_HEAD(&timer->active_list_head);
 795         INIT_LIST_HEAD(&timer->ack_list_head);
 796         INIT_LIST_HEAD(&timer->sack_list_head);
 797         spin_lock_init(&timer->lock);
 798         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 799                      (unsigned long)timer);
 800         if (card != NULL) {
 801                 timer->module = card->module;
 802                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 803                 if (err < 0) {
 804                         snd_timer_free(timer);
 805                         return err;
 806                 }
 807         }
 808         *rtimer = timer;
 809         return 0;
 810 }
 811
 812 static int snd_timer_free(struct snd_timer *timer)
 813 {
 814         snd_assert(timer != NULL, return -ENXIO);
 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         struct list_head *p;
 832
 833         snd_assert(timer != NULL && timer->hw.start != NULL &&
 834                    timer->hw.stop != NULL, return -ENXIO);
 835         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 836             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 837                 return -EINVAL;
 838
 839         mutex_lock(&register_mutex);
 840         list_for_each(p, &snd_timer_list) {
 841                 timer1 = list_entry(p, struct snd_timer, device_list);
 842                 if (timer1->tmr_class > timer->tmr_class)
 843                         break;
 844                 if (timer1->tmr_class < timer->tmr_class)
 845                         continue;
 846                 if (timer1->card && timer->card) {
 847                         if (timer1->card->number > timer->card->number)
 848                                 break;
 849                         if (timer1->card->number < timer->card->number)
 850                                 continue;
 851                 }
 852                 if (timer1->tmr_device > timer->tmr_device)
 853                         break;
 854                 if (timer1->tmr_device < timer->tmr_device)
 855                         continue;
 856                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 857                         break;
 858                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 859                         continue;
 860                 /* conflicts.. */
 861                 mutex_unlock(&register_mutex);
 862                 return -EBUSY;
 863         }
 864         list_add_tail(&timer->device_list, p);
 865         mutex_unlock(&register_mutex);
 866         return 0;
 867 }
 868
 869 static int snd_timer_unregister(struct snd_timer *timer)
 870 {
 871         struct list_head *p, *n;
 872         struct snd_timer_instance *ti;
 873
 874         snd_assert(timer != NULL, return -ENXIO);
 875         mutex_lock(&register_mutex);
 876         if (! list_empty(&timer->open_list_head)) {
 877                 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
 878                 list_for_each_safe(p, n, &timer->open_list_head) {
 879                         list_del_init(p);
 880                         ti = list_entry(p, struct snd_timer_instance, open_list);
 881                         ti->timer = NULL;
 882                 }
 883         }
 884         list_del(&timer->device_list);
 885         mutex_unlock(&register_mutex);
 886         return snd_timer_free(timer);
 887 }
 888
 889 static int snd_timer_dev_unregister(struct snd_device *device)
 890 {
 891         struct snd_timer *timer = device->device_data;
 892         return snd_timer_unregister(timer);
 893 }
 894
 895 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 896 {
 897         unsigned long flags;
 898         unsigned long resolution = 0;
 899         struct snd_timer_instance *ti, *ts;
 900         struct list_head *p, *n;
 901
 902         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 903                 return;
 904         snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
 905                    event <= SNDRV_TIMER_EVENT_MRESUME, return);
 906         spin_lock_irqsave(&timer->lock, flags);
 907         if (event == SNDRV_TIMER_EVENT_MSTART ||
 908             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 909             event == SNDRV_TIMER_EVENT_MRESUME) {
 910                 if (timer->hw.c_resolution)
 911                         resolution = timer->hw.c_resolution(timer);
 912                 else
 913                         resolution = timer->hw.resolution;
 914         }
 915         list_for_each(p, &timer->active_list_head) {
 916                 ti = list_entry(p, struct snd_timer_instance, active_list);
 917                 if (ti->ccallback)
 918                         ti->ccallback(ti, event, tstamp, resolution);
 919                 list_for_each(n, &ti->slave_active_head) {
 920                         ts = list_entry(n, struct snd_timer_instance, active_list);
 921                         if (ts->ccallback)
 922                                 ts->ccallback(ts, event, tstamp, resolution);
 923                 }
 924         }
 925         spin_unlock_irqrestore(&timer->lock, flags);
 926 }
 927
 928 /*
 929  * exported functions for global timers
 930  */
 931 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 932 {
 933         struct snd_timer_id tid;
 934
 935         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 936         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 937         tid.card = -1;
 938         tid.device = device;
 939         tid.subdevice = 0;
 940         return snd_timer_new(NULL, id, &tid, rtimer);
 941 }
 942
 943 int snd_timer_global_free(struct snd_timer *timer)
 944 {
 945         return snd_timer_free(timer);
 946 }
 947
 948 int snd_timer_global_register(struct snd_timer *timer)
 949 {
 950         struct snd_device dev;
 951
 952         memset(&dev, 0, sizeof(dev));
 953         dev.device_data = timer;
 954         return snd_timer_dev_register(&dev);
 955 }
 956
 957 int snd_timer_global_unregister(struct snd_timer *timer)
 958 {
 959         return snd_timer_unregister(timer);
 960 }
 961
 962 /*
 963  *  System timer
 964  */
 965
 966 struct snd_timer_system_private {
 967         struct timer_list tlist;
 968         struct timer * timer;
 969         unsigned long last_expires;
 970         unsigned long last_jiffies;
 971         unsigned long correction;
 972 };
 973
 974 static void snd_timer_s_function(unsigned long data)
 975 {
 976         struct snd_timer *timer = (struct snd_timer *)data;
 977         struct snd_timer_system_private *priv = timer->private_data;
 978         unsigned long jiff = jiffies;
 979         if (time_after(jiff, priv->last_expires))
 980                 priv->correction = (long)jiff - (long)priv->last_expires;
 981         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
 982 }
 983
 984 static int snd_timer_s_start(struct snd_timer * timer)
 985 {
 986         struct snd_timer_system_private *priv;
 987         unsigned long njiff;
 988
 989         priv = (struct snd_timer_system_private *) timer->private_data;
 990         njiff = (priv->last_jiffies = jiffies);
 991         if (priv->correction > timer->sticks - 1) {
 992                 priv->correction -= timer->sticks - 1;
 993                 njiff++;
 994         } else {
 995                 njiff += timer->sticks - priv->correction;
 996                 priv->correction -= timer->sticks;
 997         }
 998         priv->last_expires = priv->tlist.expires = njiff;
 999         add_timer(&priv->tlist);
1000         return 0;
1001 }
1002
1003 static int snd_timer_s_stop(struct snd_timer * timer)
1004 {
1005         struct snd_timer_system_private *priv;
1006         unsigned long jiff;
1007
1008         priv = (struct snd_timer_system_private *) timer->private_data;
1009         del_timer(&priv->tlist);
1010         jiff = jiffies;
1011         if (time_before(jiff, priv->last_expires))
1012                 timer->sticks = priv->last_expires - jiff;
1013         else
1014                 timer->sticks = 1;
1015         return 0;
1016 }
1017
1018 static struct snd_timer_hardware snd_timer_system =
1019 {
1020         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1021         .resolution =   1000000000L / HZ,
1022         .ticks =        10000000L,
1023         .start =        snd_timer_s_start,
1024         .stop =         snd_timer_s_stop
1025 };
1026
1027 static void snd_timer_free_system(struct snd_timer *timer)
1028 {
1029         kfree(timer->private_data);
1030 }
1031
1032 static int snd_timer_register_system(void)
1033 {
1034         struct snd_timer *timer;
1035         struct snd_timer_system_private *priv;
1036         int err;
1037
1038         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1039         if (err < 0)
1040                 return err;
1041         strcpy(timer->name, "system timer");
1042         timer->hw = snd_timer_system;
1043         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1044         if (priv == NULL) {
1045                 snd_timer_free(timer);
1046                 return -ENOMEM;
1047         }
1048         init_timer(&priv->tlist);
1049         priv->tlist.function = snd_timer_s_function;
1050         priv->tlist.data = (unsigned long) timer;
1051         timer->private_data = priv;
1052         timer->private_free = snd_timer_free_system;
1053         return snd_timer_global_register(timer);
1054 }
1055
1056 #ifdef CONFIG_PROC_FS
1057 /*
1058  *  Info interface
1059  */
1060
1061 static void snd_timer_proc_read(struct snd_info_entry *entry,
1062                                 struct snd_info_buffer *buffer)
1063 {
1064         struct snd_timer *timer;
1065         struct snd_timer_instance *ti;
1066         struct list_head *p, *q;
1067
1068         mutex_lock(&register_mutex);
1069         list_for_each(p, &snd_timer_list) {
1070                 timer = list_entry(p, struct snd_timer, device_list);
1071                 switch (timer->tmr_class) {
1072                 case SNDRV_TIMER_CLASS_GLOBAL:
1073                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1074                         break;
1075                 case SNDRV_TIMER_CLASS_CARD:
1076                         snd_iprintf(buffer, "C%i-%i: ",
1077                                     timer->card->number, timer->tmr_device);
1078                         break;
1079                 case SNDRV_TIMER_CLASS_PCM:
1080                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1081                                     timer->tmr_device, timer->tmr_subdevice);
1082                         break;
1083                 default:
1084                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1085                                     timer->card ? timer->card->number : -1,
1086                                     timer->tmr_device, timer->tmr_subdevice);
1087                 }
1088                 snd_iprintf(buffer, "%s :", timer->name);
1089                 if (timer->hw.resolution)
1090                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1091                                     timer->hw.resolution / 1000,
1092                                     timer->hw.resolution % 1000,
1093                                     timer->hw.ticks);
1094                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1095                         snd_iprintf(buffer, " SLAVE");
1096                 snd_iprintf(buffer, "\n");
1097                 list_for_each(q, &timer->open_list_head) {
1098                         ti = list_entry(q, struct snd_timer_instance, open_list);
1099                         snd_iprintf(buffer, "  Client %s : %s\n",
1100                                     ti->owner ? ti->owner : "unknown",
1101                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1102                                                  SNDRV_TIMER_IFLG_RUNNING)
1103                                     ? "running" : "stopped");
1104                 }
1105         }
1106         mutex_unlock(&register_mutex);
1107 }
1108
1109 static struct snd_info_entry *snd_timer_proc_entry;
1110
1111 static void __init snd_timer_proc_init(void)
1112 {
1113         struct snd_info_entry *entry;
1114
1115         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1116         if (entry != NULL) {
1117                 entry->c.text.read = snd_timer_proc_read;
1118                 if (snd_info_register(entry) < 0) {
1119                         snd_info_free_entry(entry);
1120                         entry = NULL;
1121                 }
1122         }
1123         snd_timer_proc_entry = entry;
1124 }
1125
1126 static void __exit snd_timer_proc_done(void)
1127 {
1128         snd_info_unregister(snd_timer_proc_entry);
1129 }
1130 #else /* !CONFIG_PROC_FS */
1131 #define snd_timer_proc_init()
1132 #define snd_timer_proc_done()
1133 #endif
1134
1135 /*
1136  *  USER SPACE interface
1137  */
1138
1139 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1140                                      unsigned long resolution,
1141                                      unsigned long ticks)
1142 {
1143         struct snd_timer_user *tu = timeri->callback_data;
1144         struct snd_timer_read *r;
1145         int prev;
1146
1147         spin_lock(&tu->qlock);
1148         if (tu->qused > 0) {
1149                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1150                 r = &tu->queue[prev];
1151                 if (r->resolution == resolution) {
1152                         r->ticks += ticks;
1153                         goto __wake;
1154                 }
1155         }
1156         if (tu->qused >= tu->queue_size) {
1157                 tu->overrun++;
1158         } else {
1159                 r = &tu->queue[tu->qtail++];
1160                 tu->qtail %= tu->queue_size;
1161                 r->resolution = resolution;
1162                 r->ticks = ticks;
1163                 tu->qused++;
1164         }
1165       __wake:
1166         spin_unlock(&tu->qlock);
1167         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1168         wake_up(&tu->qchange_sleep);
1169 }
1170
1171 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1172                                             struct snd_timer_tread *tread)
1173 {
1174         if (tu->qused >= tu->queue_size) {
1175                 tu->overrun++;
1176         } else {
1177                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1178                 tu->qtail %= tu->queue_size;
1179                 tu->qused++;
1180         }
1181 }
1182
1183 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1184                                      int event,
1185                                      struct timespec *tstamp,
1186                                      unsigned long resolution)
1187 {
1188         struct snd_timer_user *tu = timeri->callback_data;
1189         struct snd_timer_tread r1;
1190
1191         if (event >= SNDRV_TIMER_EVENT_START &&
1192             event <= SNDRV_TIMER_EVENT_PAUSE)
1193                 tu->tstamp = *tstamp;
1194         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1195                 return;
1196         r1.event = event;
1197         r1.tstamp = *tstamp;
1198         r1.val = resolution;
1199         spin_lock(&tu->qlock);
1200         snd_timer_user_append_to_tqueue(tu, &r1);
1201         spin_unlock(&tu->qlock);
1202         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1203         wake_up(&tu->qchange_sleep);
1204 }
1205
1206 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1207                                       unsigned long resolution,
1208                                       unsigned long ticks)
1209 {
1210         struct snd_timer_user *tu = timeri->callback_data;
1211         struct snd_timer_tread *r, r1;
1212         struct timespec tstamp;
1213         int prev, append = 0;
1214
1215         memset(&tstamp, 0, sizeof(tstamp));
1216         spin_lock(&tu->qlock);
1217         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1218                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1219                 spin_unlock(&tu->qlock);
1220                 return;
1221         }
1222         if (tu->last_resolution != resolution || ticks > 0)
1223                 getnstimeofday(&tstamp);
1224         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1225             tu->last_resolution != resolution) {
1226                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1227                 r1.tstamp = tstamp;
1228                 r1.val = resolution;
1229                 snd_timer_user_append_to_tqueue(tu, &r1);
1230                 tu->last_resolution = resolution;
1231                 append++;
1232         }
1233         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1234                 goto __wake;
1235         if (ticks == 0)
1236                 goto __wake;
1237         if (tu->qused > 0) {
1238                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1239                 r = &tu->tqueue[prev];
1240                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1241                         r->tstamp = tstamp;
1242                         r->val += ticks;
1243                         append++;
1244                         goto __wake;
1245                 }
1246         }
1247         r1.event = SNDRV_TIMER_EVENT_TICK;
1248         r1.tstamp = tstamp;
1249         r1.val = ticks;
1250         snd_timer_user_append_to_tqueue(tu, &r1);
1251         append++;
1252       __wake:
1253         spin_unlock(&tu->qlock);
1254         if (append == 0)
1255                 return;
1256         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1257         wake_up(&tu->qchange_sleep);
1258 }
1259
1260 static int snd_timer_user_open(struct inode *inode, struct file *file)
1261 {
1262         struct snd_timer_user *tu;
1263
1264         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1265         if (tu == NULL)
1266                 return -ENOMEM;
1267         spin_lock_init(&tu->qlock);
1268         init_waitqueue_head(&tu->qchange_sleep);
1269         mutex_init(&tu->tread_sem);
1270         tu->ticks = 1;
1271         tu->queue_size = 128;
1272         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1273                             GFP_KERNEL);
1274         if (tu->queue == NULL) {
1275                 kfree(tu);
1276                 return -ENOMEM;
1277         }
1278         file->private_data = tu;
1279         return 0;
1280 }
1281
1282 static int snd_timer_user_release(struct inode *inode, struct file *file)
1283 {
1284         struct snd_timer_user *tu;
1285
1286         if (file->private_data) {
1287                 tu = file->private_data;
1288                 file->private_data = NULL;
1289                 fasync_helper(-1, file, 0, &tu->fasync);
1290                 if (tu->timeri)
1291                         snd_timer_close(tu->timeri);
1292                 kfree(tu->queue);
1293                 kfree(tu->tqueue);
1294                 kfree(tu);
1295         }
1296         return 0;
1297 }
1298
1299 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1300 {
1301         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1302         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1303         id->card = -1;
1304         id->device = -1;
1305         id->subdevice = -1;
1306 }
1307
1308 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1309 {
1310         id->dev_class = timer->tmr_class;
1311         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1312         id->card = timer->card ? timer->card->number : -1;
1313         id->device = timer->tmr_device;
1314         id->subdevice = timer->tmr_subdevice;
1315 }
1316
1317 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1318 {
1319         struct snd_timer_id id;
1320         struct snd_timer *timer;
1321         struct list_head *p;
1322
1323         if (copy_from_user(&id, _tid, sizeof(id)))
1324                 return -EFAULT;
1325         mutex_lock(&register_mutex);
1326         if (id.dev_class < 0) {         /* first item */
1327                 if (list_empty(&snd_timer_list))
1328                         snd_timer_user_zero_id(&id);
1329                 else {
1330                         timer = list_entry(snd_timer_list.next,
1331                                            struct snd_timer, device_list);
1332                         snd_timer_user_copy_id(&id, timer);
1333                 }
1334         } else {
1335                 switch (id.dev_class) {
1336                 case SNDRV_TIMER_CLASS_GLOBAL:
1337                         id.device = id.device < 0 ? 0 : id.device + 1;
1338                         list_for_each(p, &snd_timer_list) {
1339                                 timer = list_entry(p, struct snd_timer, device_list);
1340                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1341                                         snd_timer_user_copy_id(&id, timer);
1342                                         break;
1343                                 }
1344                                 if (timer->tmr_device >= id.device) {
1345                                         snd_timer_user_copy_id(&id, timer);
1346                                         break;
1347                                 }
1348                         }
1349                         if (p == &snd_timer_list)
1350                                 snd_timer_user_zero_id(&id);
1351                         break;
1352                 case SNDRV_TIMER_CLASS_CARD:
1353                 case SNDRV_TIMER_CLASS_PCM:
1354                         if (id.card < 0) {
1355                                 id.card = 0;
1356                         } else {
1357                                 if (id.card < 0) {
1358                                         id.card = 0;
1359                                 } else {
1360                                         if (id.device < 0) {
1361                                                 id.device = 0;
1362                                         } else {
1363                                                 if (id.subdevice < 0) {
1364                                                         id.subdevice = 0;
1365                                                 } else {
1366                                                         id.subdevice++;
1367                                                 }
1368                                         }
1369                                 }
1370                         }
1371                         list_for_each(p, &snd_timer_list) {
1372                                 timer = list_entry(p, struct snd_timer, device_list);
1373                                 if (timer->tmr_class > id.dev_class) {
1374                                         snd_timer_user_copy_id(&id, timer);
1375                                         break;
1376                                 }
1377                                 if (timer->tmr_class < id.dev_class)
1378                                         continue;
1379                                 if (timer->card->number > id.card) {
1380                                         snd_timer_user_copy_id(&id, timer);
1381                                         break;
1382                                 }
1383                                 if (timer->card->number < id.card)
1384                                         continue;
1385                                 if (timer->tmr_device > id.device) {
1386                                         snd_timer_user_copy_id(&id, timer);
1387                                         break;
1388                                 }
1389                                 if (timer->tmr_device < id.device)
1390                                         continue;
1391                                 if (timer->tmr_subdevice > id.subdevice) {
1392                                         snd_timer_user_copy_id(&id, timer);
1393                                         break;
1394                                 }
1395                                 if (timer->tmr_subdevice < id.subdevice)
1396                                         continue;
1397                                 snd_timer_user_copy_id(&id, timer);
1398                                 break;
1399                         }
1400                         if (p == &snd_timer_list)
1401                                 snd_timer_user_zero_id(&id);
1402                         break;
1403                 default:
1404                         snd_timer_user_zero_id(&id);
1405                 }
1406         }
1407         mutex_unlock(&register_mutex);
1408         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1409                 return -EFAULT;
1410         return 0;
1411 }
1412
1413 static int snd_timer_user_ginfo(struct file *file,
1414                                 struct snd_timer_ginfo __user *_ginfo)
1415 {
1416         struct snd_timer_ginfo *ginfo;
1417         struct snd_timer_id tid;
1418         struct snd_timer *t;
1419         struct list_head *p;
1420         int err = 0;
1421
1422         ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1423         if (! ginfo)
1424                 return -ENOMEM;
1425         if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1426                 kfree(ginfo);
1427                 return -EFAULT;
1428         }
1429         tid = ginfo->tid;
1430         memset(ginfo, 0, sizeof(*ginfo));
1431         ginfo->tid = tid;
1432         mutex_lock(&register_mutex);
1433         t = snd_timer_find(&tid);
1434         if (t != NULL) {
1435                 ginfo->card = t->card ? t->card->number : -1;
1436                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1437                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1438                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1439                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1440                 ginfo->resolution = t->hw.resolution;
1441                 if (t->hw.resolution_min > 0) {
1442                         ginfo->resolution_min = t->hw.resolution_min;
1443                         ginfo->resolution_max = t->hw.resolution_max;
1444                 }
1445                 list_for_each(p, &t->open_list_head) {
1446                         ginfo->clients++;
1447                 }
1448         } else {
1449                 err = -ENODEV;
1450         }
1451         mutex_unlock(&register_mutex);
1452         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1453                 err = -EFAULT;
1454         kfree(ginfo);
1455         return err;
1456 }
1457
1458 static int snd_timer_user_gparams(struct file *file,
1459                                   struct snd_timer_gparams __user *_gparams)
1460 {
1461         struct snd_timer_gparams gparams;
1462         struct snd_timer *t;
1463         int err;
1464
1465         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1466                 return -EFAULT;
1467         mutex_lock(&register_mutex);
1468         t = snd_timer_find(&gparams.tid);
1469         if (!t) {
1470                 err = -ENODEV;
1471                 goto _error;
1472         }
1473         if (!list_empty(&t->open_list_head)) {
1474                 err = -EBUSY;
1475                 goto _error;
1476         }
1477         if (!t->hw.set_period) {
1478                 err = -ENOSYS;
1479                 goto _error;
1480         }
1481         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1482 _error:
1483         mutex_unlock(&register_mutex);
1484         return err;
1485 }
1486
1487 static int snd_timer_user_gstatus(struct file *file,
1488                                   struct snd_timer_gstatus __user *_gstatus)
1489 {
1490         struct snd_timer_gstatus gstatus;
1491         struct snd_timer_id tid;
1492         struct snd_timer *t;
1493         int err = 0;
1494
1495         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1496                 return -EFAULT;
1497         tid = gstatus.tid;
1498         memset(&gstatus, 0, sizeof(gstatus));
1499         gstatus.tid = tid;
1500         mutex_lock(&register_mutex);
1501         t = snd_timer_find(&tid);
1502         if (t != NULL) {
1503                 if (t->hw.c_resolution)
1504                         gstatus.resolution = t->hw.c_resolution(t);
1505                 else
1506                         gstatus.resolution = t->hw.resolution;
1507                 if (t->hw.precise_resolution) {
1508                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1509                                                  &gstatus.resolution_den);
1510                 } else {
1511                         gstatus.resolution_num = gstatus.resolution;
1512                         gstatus.resolution_den = 1000000000uL;
1513                 }
1514         } else {
1515                 err = -ENODEV;
1516         }
1517         mutex_unlock(&register_mutex);
1518         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1519                 err = -EFAULT;
1520         return err;
1521 }
1522
1523 static int snd_timer_user_tselect(struct file *file,
1524                                   struct snd_timer_select __user *_tselect)
1525 {
1526         struct snd_timer_user *tu;
1527         struct snd_timer_select tselect;
1528         char str[32];
1529         int err = 0;
1530
1531         tu = file->private_data;
1532         mutex_lock(&tu->tread_sem);
1533         if (tu->timeri) {
1534                 snd_timer_close(tu->timeri);
1535                 tu->timeri = NULL;
1536         }
1537         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1538                 err = -EFAULT;
1539                 goto __err;
1540         }
1541         sprintf(str, "application %i", current->pid);
1542         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1543                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1544         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1545         if (err < 0)
1546                 goto __err;
1547
1548         kfree(tu->queue);
1549         tu->queue = NULL;
1550         kfree(tu->tqueue);
1551         tu->tqueue = NULL;
1552         if (tu->tread) {
1553                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1554                                      GFP_KERNEL);
1555                 if (tu->tqueue == NULL)
1556                         err = -ENOMEM;
1557         } else {
1558                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1559                                     GFP_KERNEL);
1560                 if (tu->queue == NULL)
1561                         err = -ENOMEM;
1562         }
1563
1564         if (err < 0) {
1565                 snd_timer_close(tu->timeri);
1566                 tu->timeri = NULL;
1567         } else {
1568                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1569                 tu->timeri->callback = tu->tread
1570                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1571                 tu->timeri->ccallback = snd_timer_user_ccallback;
1572                 tu->timeri->callback_data = (void *)tu;
1573         }
1574
1575       __err:
1576         mutex_unlock(&tu->tread_sem);
1577         return err;
1578 }
1579
1580 static int snd_timer_user_info(struct file *file,
1581                                struct snd_timer_info __user *_info)
1582 {
1583         struct snd_timer_user *tu;
1584         struct snd_timer_info *info;
1585         struct snd_timer *t;
1586         int err = 0;
1587
1588         tu = file->private_data;
1589         snd_assert(tu->timeri != NULL, return -ENXIO);
1590         t = tu->timeri->timer;
1591         snd_assert(t != NULL, return -ENXIO);
1592
1593         info = kzalloc(sizeof(*info), GFP_KERNEL);
1594         if (! info)
1595                 return -ENOMEM;
1596         info->card = t->card ? t->card->number : -1;
1597         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1598                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1599         strlcpy(info->id, t->id, sizeof(info->id));
1600         strlcpy(info->name, t->name, sizeof(info->name));
1601         info->resolution = t->hw.resolution;
1602         if (copy_to_user(_info, info, sizeof(*_info)))
1603                 err = -EFAULT;
1604         kfree(info);
1605         return err;
1606 }
1607
1608 static int snd_timer_user_params(struct file *file,
1609                                  struct snd_timer_params __user *_params)
1610 {
1611         struct snd_timer_user *tu;
1612         struct snd_timer_params params;
1613         struct snd_timer *t;
1614         struct snd_timer_read *tr;
1615         struct snd_timer_tread *ttr;
1616         int err;
1617
1618         tu = file->private_data;
1619         snd_assert(tu->timeri != NULL, return -ENXIO);
1620         t = tu->timeri->timer;
1621         snd_assert(t != NULL, return -ENXIO);
1622         if (copy_from_user(&params, _params, sizeof(params)))
1623                 return -EFAULT;
1624         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1625                 err = -EINVAL;
1626                 goto _end;
1627         }
1628         if (params.queue_size > 0 &&
1629             (params.queue_size < 32 || params.queue_size > 1024)) {
1630                 err = -EINVAL;
1631                 goto _end;
1632         }
1633         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1634                               (1<<SNDRV_TIMER_EVENT_TICK)|
1635                               (1<<SNDRV_TIMER_EVENT_START)|
1636                               (1<<SNDRV_TIMER_EVENT_STOP)|
1637                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1638                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1639                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1640                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1641                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1642                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1643                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1644                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1645                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1646                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1647                 err = -EINVAL;
1648                 goto _end;
1649         }
1650         snd_timer_stop(tu->timeri);
1651         spin_lock_irq(&t->lock);
1652         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1653                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1654                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1655         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1656                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1657         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1658                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1659         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1660                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1661         spin_unlock_irq(&t->lock);
1662         if (params.queue_size > 0 &&
1663             (unsigned int)tu->queue_size != params.queue_size) {
1664                 if (tu->tread) {
1665                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1666                                       GFP_KERNEL);
1667                         if (ttr) {
1668                                 kfree(tu->tqueue);
1669                                 tu->queue_size = params.queue_size;
1670                                 tu->tqueue = ttr;
1671                         }
1672                 } else {
1673                         tr = kmalloc(params.queue_size * sizeof(*tr),
1674                                      GFP_KERNEL);
1675                         if (tr) {
1676                                 kfree(tu->queue);
1677                                 tu->queue_size = params.queue_size;
1678                                 tu->queue = tr;
1679                         }
1680                 }
1681         }
1682         tu->qhead = tu->qtail = tu->qused = 0;
1683         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1684                 if (tu->tread) {
1685                         struct snd_timer_tread tread;
1686                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1687                         tread.tstamp.tv_sec = 0;
1688                         tread.tstamp.tv_nsec = 0;
1689                         tread.val = 0;
1690                         snd_timer_user_append_to_tqueue(tu, &tread);
1691                 } else {
1692                         struct snd_timer_read *r = &tu->queue[0];
1693                         r->resolution = 0;
1694                         r->ticks = 0;
1695                         tu->qused++;
1696                         tu->qtail++;
1697                 }
1698         }
1699         tu->filter = params.filter;
1700         tu->ticks = params.ticks;
1701         err = 0;
1702  _end:
1703         if (copy_to_user(_params, &params, sizeof(params)))
1704                 return -EFAULT;
1705         return err;
1706 }
1707
1708 static int snd_timer_user_status(struct file *file,
1709                                  struct snd_timer_status __user *_status)
1710 {
1711         struct snd_timer_user *tu;
1712         struct snd_timer_status status;
1713
1714         tu = file->private_data;
1715         snd_assert(tu->timeri != NULL, return -ENXIO);
1716         memset(&status, 0, sizeof(status));
1717         status.tstamp = tu->tstamp;
1718         status.resolution = snd_timer_resolution(tu->timeri);
1719         status.lost = tu->timeri->lost;
1720         status.overrun = tu->overrun;
1721         spin_lock_irq(&tu->qlock);
1722         status.queue = tu->qused;
1723         spin_unlock_irq(&tu->qlock);
1724         if (copy_to_user(_status, &status, sizeof(status)))
1725                 return -EFAULT;
1726         return 0;
1727 }
1728
1729 static int snd_timer_user_start(struct file *file)
1730 {
1731         int err;
1732         struct snd_timer_user *tu;
1733
1734         tu = file->private_data;
1735         snd_assert(tu->timeri != NULL, return -ENXIO);
1736         snd_timer_stop(tu->timeri);
1737         tu->timeri->lost = 0;
1738         tu->last_resolution = 0;
1739         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1740 }
1741
1742 static int snd_timer_user_stop(struct file *file)
1743 {
1744         int err;
1745         struct snd_timer_user *tu;
1746
1747         tu = file->private_data;
1748         snd_assert(tu->timeri != NULL, return -ENXIO);
1749         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1750 }
1751
1752 static int snd_timer_user_continue(struct file *file)
1753 {
1754         int err;
1755         struct snd_timer_user *tu;
1756
1757         tu = file->private_data;
1758         snd_assert(tu->timeri != NULL, return -ENXIO);
1759         tu->timeri->lost = 0;
1760         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1761 }
1762
1763 static int snd_timer_user_pause(struct file *file)
1764 {
1765         int err;
1766         struct snd_timer_user *tu;
1767
1768         tu = file->private_data;
1769         snd_assert(tu->timeri != NULL, return -ENXIO);
1770         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1771 }
1772
1773 enum {
1774         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1775         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1776         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1777         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1778 };
1779
1780 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1781                                  unsigned long arg)
1782 {
1783         struct snd_timer_user *tu;
1784         void __user *argp = (void __user *)arg;
1785         int __user *p = argp;
1786
1787         tu = file->private_data;
1788         switch (cmd) {
1789         case SNDRV_TIMER_IOCTL_PVERSION:
1790                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1791         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1792                 return snd_timer_user_next_device(argp);
1793         case SNDRV_TIMER_IOCTL_TREAD:
1794         {
1795                 int xarg;
1796
1797                 mutex_lock(&tu->tread_sem);
1798                 if (tu->timeri) {       /* too late */
1799                         mutex_unlock(&tu->tread_sem);
1800                         return -EBUSY;
1801                 }
1802                 if (get_user(xarg, p)) {
1803                         mutex_unlock(&tu->tread_sem);
1804                         return -EFAULT;
1805                 }
1806                 tu->tread = xarg ? 1 : 0;
1807                 mutex_unlock(&tu->tread_sem);
1808                 return 0;
1809         }
1810         case SNDRV_TIMER_IOCTL_GINFO:
1811                 return snd_timer_user_ginfo(file, argp);
1812         case SNDRV_TIMER_IOCTL_GPARAMS:
1813                 return snd_timer_user_gparams(file, argp);
1814         case SNDRV_TIMER_IOCTL_GSTATUS:
1815                 return snd_timer_user_gstatus(file, argp);
1816         case SNDRV_TIMER_IOCTL_SELECT:
1817                 return snd_timer_user_tselect(file, argp);
1818         case SNDRV_TIMER_IOCTL_INFO:
1819                 return snd_timer_user_info(file, argp);
1820         case SNDRV_TIMER_IOCTL_PARAMS:
1821                 return snd_timer_user_params(file, argp);
1822         case SNDRV_TIMER_IOCTL_STATUS:
1823                 return snd_timer_user_status(file, argp);
1824         case SNDRV_TIMER_IOCTL_START:
1825         case SNDRV_TIMER_IOCTL_START_OLD:
1826                 return snd_timer_user_start(file);
1827         case SNDRV_TIMER_IOCTL_STOP:
1828         case SNDRV_TIMER_IOCTL_STOP_OLD:
1829                 return snd_timer_user_stop(file);
1830         case SNDRV_TIMER_IOCTL_CONTINUE:
1831         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1832                 return snd_timer_user_continue(file);
1833         case SNDRV_TIMER_IOCTL_PAUSE:
1834         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1835                 return snd_timer_user_pause(file);
1836         }
1837         return -ENOTTY;
1838 }
1839
1840 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1841 {
1842         struct snd_timer_user *tu;
1843         int err;
1844
1845         tu = file->private_data;
1846         err = fasync_helper(fd, file, on, &tu->fasync);
1847         if (err < 0)
1848                 return err;
1849         return 0;
1850 }
1851
1852 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1853                                    size_t count, loff_t *offset)
1854 {
1855         struct snd_timer_user *tu;
1856         long result = 0, unit;
1857         int err = 0;
1858
1859         tu = file->private_data;
1860         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1861         spin_lock_irq(&tu->qlock);
1862         while ((long)count - result >= unit) {
1863                 while (!tu->qused) {
1864                         wait_queue_t wait;
1865
1866                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1867                                 err = -EAGAIN;
1868                                 break;
1869                         }
1870
1871                         set_current_state(TASK_INTERRUPTIBLE);
1872                         init_waitqueue_entry(&wait, current);
1873                         add_wait_queue(&tu->qchange_sleep, &wait);
1874
1875                         spin_unlock_irq(&tu->qlock);
1876                         schedule();
1877                         spin_lock_irq(&tu->qlock);
1878
1879                         remove_wait_queue(&tu->qchange_sleep, &wait);
1880
1881                         if (signal_pending(current)) {
1882                                 err = -ERESTARTSYS;
1883                                 break;
1884                         }
1885                 }
1886
1887                 spin_unlock_irq(&tu->qlock);
1888                 if (err < 0)
1889                         goto _error;
1890
1891                 if (tu->tread) {
1892                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1893                                          sizeof(struct snd_timer_tread))) {
1894                                 err = -EFAULT;
1895                                 goto _error;
1896                         }
1897                 } else {
1898                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1899                                          sizeof(struct snd_timer_read))) {
1900                                 err = -EFAULT;
1901                                 goto _error;
1902                         }
1903                 }
1904
1905                 tu->qhead %= tu->queue_size;
1906
1907                 result += unit;
1908                 buffer += unit;
1909
1910                 spin_lock_irq(&tu->qlock);
1911                 tu->qused--;
1912         }
1913         spin_unlock_irq(&tu->qlock);
1914  _error:
1915         return result > 0 ? result : err;
1916 }
1917
1918 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1919 {
1920         unsigned int mask;
1921         struct snd_timer_user *tu;
1922
1923         tu = file->private_data;
1924
1925         poll_wait(file, &tu->qchange_sleep, wait);
1926
1927         mask = 0;
1928         if (tu->qused)
1929                 mask |= POLLIN | POLLRDNORM;
1930
1931         return mask;
1932 }
1933
1934 #ifdef CONFIG_COMPAT
1935 #include "timer_compat.c"
1936 #else
1937 #define snd_timer_user_ioctl_compat     NULL
1938 #endif
1939
1940 static struct file_operations snd_timer_f_ops =
1941 {
1942         .owner =        THIS_MODULE,
1943         .read =         snd_timer_user_read,
1944         .open =         snd_timer_user_open,
1945         .release =      snd_timer_user_release,
1946         .poll =         snd_timer_user_poll,
1947         .unlocked_ioctl =       snd_timer_user_ioctl,
1948         .compat_ioctl = snd_timer_user_ioctl_compat,
1949         .fasync =       snd_timer_user_fasync,
1950 };
1951
1952 /*
1953  *  ENTRY functions
1954  */
1955
1956 static int __init alsa_timer_init(void)
1957 {
1958         int err;
1959
1960 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1961         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1962                               "system timer");
1963 #endif
1964
1965         if ((err = snd_timer_register_system()) < 0)
1966                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1967                            err);
1968         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1969                                        &snd_timer_f_ops, NULL, "timer")) < 0)
1970                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1971                            err);
1972         snd_timer_proc_init();
1973         return 0;
1974 }
1975
1976 static void __exit alsa_timer_exit(void)
1977 {
1978         struct list_head *p, *n;
1979
1980         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1981         /* unregister the system timer */
1982         list_for_each_safe(p, n, &snd_timer_list) {
1983                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1984                 snd_timer_unregister(timer);
1985         }
1986         snd_timer_proc_done();
1987 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1988         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1989 #endif
1990 }
1991
1992 module_init(alsa_timer_init)
1993 module_exit(alsa_timer_exit)
1994
1995 EXPORT_SYMBOL(snd_timer_open);
1996 EXPORT_SYMBOL(snd_timer_close);
1997 EXPORT_SYMBOL(snd_timer_resolution);
1998 EXPORT_SYMBOL(snd_timer_start);
1999 EXPORT_SYMBOL(snd_timer_stop);
2000 EXPORT_SYMBOL(snd_timer_continue);
2001 EXPORT_SYMBOL(snd_timer_pause);
2002 EXPORT_SYMBOL(snd_timer_new);
2003 EXPORT_SYMBOL(snd_timer_notify);
2004 EXPORT_SYMBOL(snd_timer_global_new);
2005 EXPORT_SYMBOL(snd_timer_global_free);
2006 EXPORT_SYMBOL(snd_timer_global_register);
2007 EXPORT_SYMBOL(snd_timer_global_unregister);
2008 EXPORT_SYMBOL(snd_timer_interrupt);