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/module.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_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
  38 #define DEFAULT_TIMER_LIMIT 4
  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 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  56 MODULE_ALIAS("devname:snd/timer");
  57
  58 struct snd_timer_user {
  59         struct snd_timer_instance *timeri;
  60         int tread;              /* enhanced read with timestamps and events */
  61         unsigned long ticks;
  62         unsigned long overrun;
  63         int qhead;
  64         int qtail;
  65         int qused;
  66         int queue_size;
  67         struct snd_timer_read *queue;
  68         struct snd_timer_tread *tqueue;
  69         spinlock_t qlock;
  70         unsigned long last_resolution;
  71         unsigned int filter;
  72         struct timespec tstamp;         /* trigger tstamp */
  73         wait_queue_head_t qchange_sleep;
  74         struct fasync_struct *fasync;
  75         struct mutex ioctl_lock;
  76 };
  77
  78 /* list of timers */
  79 static LIST_HEAD(snd_timer_list);
  80
  81 /* list of slave instances */
  82 static LIST_HEAD(snd_timer_slave_list);
  83
  84 /* lock for slave active lists */
  85 static DEFINE_SPINLOCK(slave_active_lock);
  86
  87 static DEFINE_MUTEX(register_mutex);
  88
  89 static int snd_timer_free(struct snd_timer *timer);
  90 static int snd_timer_dev_free(struct snd_device *device);
  91 static int snd_timer_dev_register(struct snd_device *device);
  92 static int snd_timer_dev_disconnect(struct snd_device *device);
  93
  94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  95
  96 /*
  97  * create a timer instance with the given owner string.
  98  * when timer is not NULL, increments the module counter
  99  */
 100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 101                                                          struct snd_timer *timer)
 102 {
 103         struct snd_timer_instance *timeri;
 104         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 105         if (timeri == NULL)
 106                 return NULL;
 107         timeri->owner = kstrdup(owner, GFP_KERNEL);
 108         if (! timeri->owner) {
 109                 kfree(timeri);
 110                 return NULL;
 111         }
 112         INIT_LIST_HEAD(&timeri->open_list);
 113         INIT_LIST_HEAD(&timeri->active_list);
 114         INIT_LIST_HEAD(&timeri->ack_list);
 115         INIT_LIST_HEAD(&timeri->slave_list_head);
 116         INIT_LIST_HEAD(&timeri->slave_active_head);
 117
 118         timeri->timer = timer;
 119         if (timer && !try_module_get(timer->module)) {
 120                 kfree(timeri->owner);
 121                 kfree(timeri);
 122                 return NULL;
 123         }
 124
 125         return timeri;
 126 }
 127
 128 /*
 129  * find a timer instance from the given timer id
 130  */
 131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 132 {
 133         struct snd_timer *timer = NULL;
 134
 135         list_for_each_entry(timer, &snd_timer_list, device_list) {
 136                 if (timer->tmr_class != tid->dev_class)
 137                         continue;
 138                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 139                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 140                     (timer->card == NULL ||
 141                      timer->card->number != tid->card))
 142                         continue;
 143                 if (timer->tmr_device != tid->device)
 144                         continue;
 145                 if (timer->tmr_subdevice != tid->subdevice)
 146                         continue;
 147                 return timer;
 148         }
 149         return NULL;
 150 }
 151
 152 #ifdef CONFIG_MODULES
 153
 154 static void snd_timer_request(struct snd_timer_id *tid)
 155 {
 156         switch (tid->dev_class) {
 157         case SNDRV_TIMER_CLASS_GLOBAL:
 158                 if (tid->device < timer_limit)
 159                         request_module("snd-timer-%i", tid->device);
 160                 break;
 161         case SNDRV_TIMER_CLASS_CARD:
 162         case SNDRV_TIMER_CLASS_PCM:
 163                 if (tid->card < snd_ecards_limit)
 164                         request_module("snd-card-%i", tid->card);
 165                 break;
 166         default:
 167                 break;
 168         }
 169 }
 170
 171 #endif
 172
 173 /*
 174  * look for a master instance matching with the slave id of the given slave.
 175  * when found, relink the open_link of the slave.
 176  *
 177  * call this with register_mutex down.
 178  */
 179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 180 {
 181         struct snd_timer *timer;
 182         struct snd_timer_instance *master;
 183
 184         /* FIXME: it's really dumb to look up all entries.. */
 185         list_for_each_entry(timer, &snd_timer_list, device_list) {
 186                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 187                         if (slave->slave_class == master->slave_class &&
 188                             slave->slave_id == master->slave_id) {
 189                                 list_move_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                         spin_lock(&master->timer->lock);
 218                         slave->master = master;
 219                         slave->timer = master->timer;
 220                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 221                                 list_add_tail(&slave->active_list,
 222                                               &master->slave_active_head);
 223                         spin_unlock(&master->timer->lock);
 224                         spin_unlock_irq(&slave_active_lock);
 225                 }
 226         }
 227 }
 228
 229 /*
 230  * open a timer instance
 231  * when opening a master, the slave id must be here given.
 232  */
 233 int snd_timer_open(struct snd_timer_instance **ti,
 234                    char *owner, struct snd_timer_id *tid,
 235                    unsigned int slave_id)
 236 {
 237         struct snd_timer *timer;
 238         struct snd_timer_instance *timeri = NULL;
 239
 240         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 241                 /* open a slave instance */
 242                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 243                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 244                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
 245                         return -EINVAL;
 246                 }
 247                 mutex_lock(&register_mutex);
 248                 timeri = snd_timer_instance_new(owner, NULL);
 249                 if (!timeri) {
 250                         mutex_unlock(&register_mutex);
 251                         return -ENOMEM;
 252                 }
 253                 timeri->slave_class = tid->dev_sclass;
 254                 timeri->slave_id = tid->device;
 255                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 256                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 257                 snd_timer_check_slave(timeri);
 258                 mutex_unlock(&register_mutex);
 259                 *ti = timeri;
 260                 return 0;
 261         }
 262
 263         /* open a master instance */
 264         mutex_lock(&register_mutex);
 265         timer = snd_timer_find(tid);
 266 #ifdef CONFIG_MODULES
 267         if (!timer) {
 268                 mutex_unlock(&register_mutex);
 269                 snd_timer_request(tid);
 270                 mutex_lock(&register_mutex);
 271                 timer = snd_timer_find(tid);
 272         }
 273 #endif
 274         if (!timer) {
 275                 mutex_unlock(&register_mutex);
 276                 return -ENODEV;
 277         }
 278         if (!list_empty(&timer->open_list_head)) {
 279                 timeri = list_entry(timer->open_list_head.next,
 280                                     struct snd_timer_instance, open_list);
 281                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 282                         mutex_unlock(&register_mutex);
 283                         return -EBUSY;
 284                 }
 285         }
 286         timeri = snd_timer_instance_new(owner, timer);
 287         if (!timeri) {
 288                 mutex_unlock(&register_mutex);
 289                 return -ENOMEM;
 290         }
 291         timeri->slave_class = tid->dev_sclass;
 292         timeri->slave_id = slave_id;
 293
 294         if (list_empty(&timer->open_list_head) && timer->hw.open) {
 295                 int err = timer->hw.open(timer);
 296                 if (err) {
 297                         kfree(timeri->owner);
 298                         kfree(timeri);
 299
 300                         module_put(timer->module);
 301                         mutex_unlock(&register_mutex);
 302                         return err;
 303                 }
 304         }
 305
 306         list_add_tail(&timeri->open_list, &timer->open_list_head);
 307         snd_timer_check_master(timeri);
 308         mutex_unlock(&register_mutex);
 309         *ti = timeri;
 310         return 0;
 311 }
 312
 313 static int _snd_timer_stop(struct snd_timer_instance *timeri,
 314                            int keep_flag, int event);
 315
 316 /*
 317  * close a timer instance
 318  */
 319 int snd_timer_close(struct snd_timer_instance *timeri)
 320 {
 321         struct snd_timer *timer = NULL;
 322         struct snd_timer_instance *slave, *tmp;
 323
 324         if (snd_BUG_ON(!timeri))
 325                 return -ENXIO;
 326
 327         /* force to stop the timer */
 328         snd_timer_stop(timeri);
 329
 330         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 331                 /* wait, until the active callback is finished */
 332                 spin_lock_irq(&slave_active_lock);
 333                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 334                         spin_unlock_irq(&slave_active_lock);
 335                         udelay(10);
 336                         spin_lock_irq(&slave_active_lock);
 337                 }
 338                 spin_unlock_irq(&slave_active_lock);
 339                 mutex_lock(&register_mutex);
 340                 list_del(&timeri->open_list);
 341                 mutex_unlock(&register_mutex);
 342         } else {
 343                 timer = timeri->timer;
 344                 if (snd_BUG_ON(!timer))
 345                         goto out;
 346                 /* wait, until the active callback is finished */
 347                 spin_lock_irq(&timer->lock);
 348                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 349                         spin_unlock_irq(&timer->lock);
 350                         udelay(10);
 351                         spin_lock_irq(&timer->lock);
 352                 }
 353                 spin_unlock_irq(&timer->lock);
 354                 mutex_lock(&register_mutex);
 355                 list_del(&timeri->open_list);
 356                 if (timer && list_empty(&timer->open_list_head) &&
 357                     timer->hw.close)
 358                         timer->hw.close(timer);
 359                 /* remove slave links */
 360                 spin_lock_irq(&slave_active_lock);
 361                 spin_lock(&timer->lock);
 362                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 363                                          open_list) {
 364                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 365                         slave->master = NULL;
 366                         slave->timer = NULL;
 367                         list_del_init(&slave->ack_list);
 368                         list_del_init(&slave->active_list);
 369                 }
 370                 spin_unlock(&timer->lock);
 371                 spin_unlock_irq(&slave_active_lock);
 372                 mutex_unlock(&register_mutex);
 373         }
 374  out:
 375         if (timeri->private_free)
 376                 timeri->private_free(timeri);
 377         kfree(timeri->owner);
 378         kfree(timeri);
 379         if (timer)
 380                 module_put(timer->module);
 381         return 0;
 382 }
 383
 384 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 385 {
 386         struct snd_timer * timer;
 387
 388         if (timeri == NULL)
 389                 return 0;
 390         if ((timer = timeri->timer) != NULL) {
 391                 if (timer->hw.c_resolution)
 392                         return timer->hw.c_resolution(timer);
 393                 return timer->hw.resolution;
 394         }
 395         return 0;
 396 }
 397
 398 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 399 {
 400         struct snd_timer *timer;
 401         unsigned long flags;
 402         unsigned long resolution = 0;
 403         struct snd_timer_instance *ts;
 404         struct timespec tstamp;
 405
 406         if (timer_tstamp_monotonic)
 407                 do_posix_clock_monotonic_gettime(&tstamp);
 408         else
 409                 getnstimeofday(&tstamp);
 410         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 411                        event > SNDRV_TIMER_EVENT_PAUSE))
 412                 return;
 413         if (event == SNDRV_TIMER_EVENT_START ||
 414             event == SNDRV_TIMER_EVENT_CONTINUE)
 415                 resolution = snd_timer_resolution(ti);
 416         if (ti->ccallback)
 417                 ti->ccallback(ti, event, &tstamp, resolution);
 418         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 419                 return;
 420         timer = ti->timer;
 421         if (timer == NULL)
 422                 return;
 423         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 424                 return;
 425         spin_lock_irqsave(&timer->lock, flags);
 426         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 427                 if (ts->ccallback)
 428                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 429         spin_unlock_irqrestore(&timer->lock, flags);
 430 }
 431
 432 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
 433                             unsigned long sticks)
 434 {
 435         list_move_tail(&timeri->active_list, &timer->active_list_head);
 436         if (timer->running) {
 437                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 438                         goto __start_now;
 439                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 440                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 441                 return 1;       /* delayed start */
 442         } else {
 443                 timer->sticks = sticks;
 444                 timer->hw.start(timer);
 445               __start_now:
 446                 timer->running++;
 447                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 448                 return 0;
 449         }
 450 }
 451
 452 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
 453 {
 454         unsigned long flags;
 455
 456         spin_lock_irqsave(&slave_active_lock, flags);
 457         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 458                 spin_unlock_irqrestore(&slave_active_lock, flags);
 459                 return -EBUSY;
 460         }
 461         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 462         if (timeri->master && timeri->timer) {
 463                 spin_lock(&timeri->timer->lock);
 464                 list_add_tail(&timeri->active_list,
 465                               &timeri->master->slave_active_head);
 466                 spin_unlock(&timeri->timer->lock);
 467         }
 468         spin_unlock_irqrestore(&slave_active_lock, flags);
 469         return 1; /* delayed start */
 470 }
 471
 472 /*
 473  *  start the timer instance
 474  */
 475 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 476 {
 477         struct snd_timer *timer;
 478         int result = -EINVAL;
 479         unsigned long flags;
 480
 481         if (timeri == NULL || ticks < 1)
 482                 return -EINVAL;
 483         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 484                 result = snd_timer_start_slave(timeri);
 485                 if (result >= 0)
 486                         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 487                 return result;
 488         }
 489         timer = timeri->timer;
 490         if (timer == NULL)
 491                 return -EINVAL;
 492         spin_lock_irqsave(&timer->lock, flags);
 493         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 494                              SNDRV_TIMER_IFLG_START)) {
 495                 result = -EBUSY;
 496                 goto unlock;
 497         }
 498         timeri->ticks = timeri->cticks = ticks;
 499         timeri->pticks = 0;
 500         result = snd_timer_start1(timer, timeri, ticks);
 501  unlock:
 502         spin_unlock_irqrestore(&timer->lock, flags);
 503         if (result >= 0)
 504                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 505         return result;
 506 }
 507
 508 static int _snd_timer_stop(struct snd_timer_instance * timeri,
 509                            int keep_flag, int event)
 510 {
 511         struct snd_timer *timer;
 512         unsigned long flags;
 513
 514         if (snd_BUG_ON(!timeri))
 515                 return -ENXIO;
 516
 517         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 518                 if (!keep_flag) {
 519                         spin_lock_irqsave(&slave_active_lock, flags);
 520                         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 521                                 spin_unlock_irqrestore(&slave_active_lock, flags);
 522                                 return -EBUSY;
 523                         }
 524                         if (timeri->timer)
 525                                 spin_lock(&timeri->timer->lock);
 526                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 527                         list_del_init(&timeri->ack_list);
 528                         list_del_init(&timeri->active_list);
 529                         if (timeri->timer)
 530                                 spin_unlock(&timeri->timer->lock);
 531                         spin_unlock_irqrestore(&slave_active_lock, flags);
 532                 }
 533                 goto __end;
 534         }
 535         timer = timeri->timer;
 536         if (!timer)
 537                 return -EINVAL;
 538         spin_lock_irqsave(&timer->lock, flags);
 539         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 540                                SNDRV_TIMER_IFLG_START))) {
 541                 spin_unlock_irqrestore(&timer->lock, flags);
 542                 return -EBUSY;
 543         }
 544         list_del_init(&timeri->ack_list);
 545         list_del_init(&timeri->active_list);
 546         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 547             !(--timer->running)) {
 548                 timer->hw.stop(timer);
 549                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 550                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 551                         snd_timer_reschedule(timer, 0);
 552                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 553                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 554                                 timer->hw.start(timer);
 555                         }
 556                 }
 557         }
 558         if (!keep_flag)
 559                 timeri->flags &=
 560                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 561         spin_unlock_irqrestore(&timer->lock, flags);
 562       __end:
 563         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 564                 snd_timer_notify1(timeri, event);
 565         return 0;
 566 }
 567
 568 /*
 569  * stop the timer instance.
 570  *
 571  * do not call this from the timer callback!
 572  */
 573 int snd_timer_stop(struct snd_timer_instance *timeri)
 574 {
 575         struct snd_timer *timer;
 576         unsigned long flags;
 577         int err;
 578
 579         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
 580         if (err < 0)
 581                 return err;
 582         timer = timeri->timer;
 583         if (!timer)
 584                 return -EINVAL;
 585         spin_lock_irqsave(&timer->lock, flags);
 586         timeri->cticks = timeri->ticks;
 587         timeri->pticks = 0;
 588         spin_unlock_irqrestore(&timer->lock, flags);
 589         return 0;
 590 }
 591
 592 /*
 593  * start again..  the tick is kept.
 594  */
 595 int snd_timer_continue(struct snd_timer_instance *timeri)
 596 {
 597         struct snd_timer *timer;
 598         int result = -EINVAL;
 599         unsigned long flags;
 600
 601         if (timeri == NULL)
 602                 return result;
 603         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 604                 return snd_timer_start_slave(timeri);
 605         timer = timeri->timer;
 606         if (! timer)
 607                 return -EINVAL;
 608         spin_lock_irqsave(&timer->lock, flags);
 609         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 610                 result = -EBUSY;
 611                 goto unlock;
 612         }
 613         if (!timeri->cticks)
 614                 timeri->cticks = 1;
 615         timeri->pticks = 0;
 616         result = snd_timer_start1(timer, timeri, timer->sticks);
 617  unlock:
 618         spin_unlock_irqrestore(&timer->lock, flags);
 619         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
 620         return result;
 621 }
 622
 623 /*
 624  * pause.. remember the ticks left
 625  */
 626 int snd_timer_pause(struct snd_timer_instance * timeri)
 627 {
 628         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
 629 }
 630
 631 /*
 632  * reschedule the timer
 633  *
 634  * start pending instances and check the scheduling ticks.
 635  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 636  */
 637 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 638 {
 639         struct snd_timer_instance *ti;
 640         unsigned long ticks = ~0UL;
 641
 642         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 643                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 644                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 645                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 646                         timer->running++;
 647                 }
 648                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 649                         if (ticks > ti->cticks)
 650                                 ticks = ti->cticks;
 651                 }
 652         }
 653         if (ticks == ~0UL) {
 654                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 655                 return;
 656         }
 657         if (ticks > timer->hw.ticks)
 658                 ticks = timer->hw.ticks;
 659         if (ticks_left != ticks)
 660                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 661         timer->sticks = ticks;
 662 }
 663
 664 /*
 665  * timer tasklet
 666  *
 667  */
 668 static void snd_timer_tasklet(unsigned long arg)
 669 {
 670         struct snd_timer *timer = (struct snd_timer *) arg;
 671         struct snd_timer_instance *ti;
 672         struct list_head *p;
 673         unsigned long resolution, ticks;
 674         unsigned long flags;
 675
 676         spin_lock_irqsave(&timer->lock, flags);
 677         /* now process all callbacks */
 678         while (!list_empty(&timer->sack_list_head)) {
 679                 p = timer->sack_list_head.next;         /* get first item */
 680                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 681
 682                 /* remove from ack_list and make empty */
 683                 list_del_init(p);
 684
 685                 ticks = ti->pticks;
 686                 ti->pticks = 0;
 687                 resolution = ti->resolution;
 688
 689                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 690                 spin_unlock(&timer->lock);
 691                 if (ti->callback)
 692                         ti->callback(ti, resolution, ticks);
 693                 spin_lock(&timer->lock);
 694                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 695         }
 696         spin_unlock_irqrestore(&timer->lock, flags);
 697 }
 698
 699 /*
 700  * timer interrupt
 701  *
 702  * ticks_left is usually equal to timer->sticks.
 703  *
 704  */
 705 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 706 {
 707         struct snd_timer_instance *ti, *ts, *tmp;
 708         unsigned long resolution, ticks;
 709         struct list_head *p, *ack_list_head;
 710         unsigned long flags;
 711         int use_tasklet = 0;
 712
 713         if (timer == NULL)
 714                 return;
 715
 716         spin_lock_irqsave(&timer->lock, flags);
 717
 718         /* remember the current resolution */
 719         if (timer->hw.c_resolution)
 720                 resolution = timer->hw.c_resolution(timer);
 721         else
 722                 resolution = timer->hw.resolution;
 723
 724         /* loop for all active instances
 725          * Here we cannot use list_for_each_entry because the active_list of a
 726          * processed instance is relinked to done_list_head before the callback
 727          * is called.
 728          */
 729         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 730                                  active_list) {
 731                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 732                         continue;
 733                 ti->pticks += ticks_left;
 734                 ti->resolution = resolution;
 735                 if (ti->cticks < ticks_left)
 736                         ti->cticks = 0;
 737                 else
 738                         ti->cticks -= ticks_left;
 739                 if (ti->cticks) /* not expired */
 740                         continue;
 741                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 742                         ti->cticks = ti->ticks;
 743                 } else {
 744                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 745                         --timer->running;
 746                         list_del_init(&ti->active_list);
 747                 }
 748                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 749                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 750                         ack_list_head = &timer->ack_list_head;
 751                 else
 752                         ack_list_head = &timer->sack_list_head;
 753                 if (list_empty(&ti->ack_list))
 754                         list_add_tail(&ti->ack_list, ack_list_head);
 755                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 756                         ts->pticks = ti->pticks;
 757                         ts->resolution = resolution;
 758                         if (list_empty(&ts->ack_list))
 759                                 list_add_tail(&ts->ack_list, ack_list_head);
 760                 }
 761         }
 762         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 763                 snd_timer_reschedule(timer, timer->sticks);
 764         if (timer->running) {
 765                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 766                         timer->hw.stop(timer);
 767                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 768                 }
 769                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 770                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 771                         /* restart timer */
 772                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 773                         timer->hw.start(timer);
 774                 }
 775         } else {
 776                 timer->hw.stop(timer);
 777         }
 778
 779         /* now process all fast callbacks */
 780         while (!list_empty(&timer->ack_list_head)) {
 781                 p = timer->ack_list_head.next;          /* get first item */
 782                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 783
 784                 /* remove from ack_list and make empty */
 785                 list_del_init(p);
 786
 787                 ticks = ti->pticks;
 788                 ti->pticks = 0;
 789
 790                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 791                 spin_unlock(&timer->lock);
 792                 if (ti->callback)
 793                         ti->callback(ti, resolution, ticks);
 794                 spin_lock(&timer->lock);
 795                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 796         }
 797
 798         /* do we have any slow callbacks? */
 799         use_tasklet = !list_empty(&timer->sack_list_head);
 800         spin_unlock_irqrestore(&timer->lock, flags);
 801
 802         if (use_tasklet)
 803                 tasklet_schedule(&timer->task_queue);
 804 }
 805
 806 /*
 807
 808  */
 809
 810 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 811                   struct snd_timer **rtimer)
 812 {
 813         struct snd_timer *timer;
 814         int err;
 815         static struct snd_device_ops ops = {
 816                 .dev_free = snd_timer_dev_free,
 817                 .dev_register = snd_timer_dev_register,
 818                 .dev_disconnect = snd_timer_dev_disconnect,
 819         };
 820
 821         if (snd_BUG_ON(!tid))
 822                 return -EINVAL;
 823         if (rtimer)
 824                 *rtimer = NULL;
 825         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 826         if (timer == NULL) {
 827                 snd_printk(KERN_ERR "timer: cannot allocate\n");
 828                 return -ENOMEM;
 829         }
 830         timer->tmr_class = tid->dev_class;
 831         timer->card = card;
 832         timer->tmr_device = tid->device;
 833         timer->tmr_subdevice = tid->subdevice;
 834         if (id)
 835                 strlcpy(timer->id, id, sizeof(timer->id));
 836         timer->sticks = 1;
 837         INIT_LIST_HEAD(&timer->device_list);
 838         INIT_LIST_HEAD(&timer->open_list_head);
 839         INIT_LIST_HEAD(&timer->active_list_head);
 840         INIT_LIST_HEAD(&timer->ack_list_head);
 841         INIT_LIST_HEAD(&timer->sack_list_head);
 842         spin_lock_init(&timer->lock);
 843         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 844                      (unsigned long)timer);
 845         if (card != NULL) {
 846                 timer->module = card->module;
 847                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 848                 if (err < 0) {
 849                         snd_timer_free(timer);
 850                         return err;
 851                 }
 852         }
 853         if (rtimer)
 854                 *rtimer = timer;
 855         return 0;
 856 }
 857
 858 static int snd_timer_free(struct snd_timer *timer)
 859 {
 860         if (!timer)
 861                 return 0;
 862
 863         mutex_lock(&register_mutex);
 864         if (! list_empty(&timer->open_list_head)) {
 865                 struct list_head *p, *n;
 866                 struct snd_timer_instance *ti;
 867                 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
 868                 list_for_each_safe(p, n, &timer->open_list_head) {
 869                         list_del_init(p);
 870                         ti = list_entry(p, struct snd_timer_instance, open_list);
 871                         ti->timer = NULL;
 872                 }
 873         }
 874         list_del(&timer->device_list);
 875         mutex_unlock(&register_mutex);
 876
 877         if (timer->private_free)
 878                 timer->private_free(timer);
 879         kfree(timer);
 880         return 0;
 881 }
 882
 883 static int snd_timer_dev_free(struct snd_device *device)
 884 {
 885         struct snd_timer *timer = device->device_data;
 886         return snd_timer_free(timer);
 887 }
 888
 889 static int snd_timer_dev_register(struct snd_device *dev)
 890 {
 891         struct snd_timer *timer = dev->device_data;
 892         struct snd_timer *timer1;
 893
 894         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 895                 return -ENXIO;
 896         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 897             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 898                 return -EINVAL;
 899
 900         mutex_lock(&register_mutex);
 901         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 902                 if (timer1->tmr_class > timer->tmr_class)
 903                         break;
 904                 if (timer1->tmr_class < timer->tmr_class)
 905                         continue;
 906                 if (timer1->card && timer->card) {
 907                         if (timer1->card->number > timer->card->number)
 908                                 break;
 909                         if (timer1->card->number < timer->card->number)
 910                                 continue;
 911                 }
 912                 if (timer1->tmr_device > timer->tmr_device)
 913                         break;
 914                 if (timer1->tmr_device < timer->tmr_device)
 915                         continue;
 916                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 917                         break;
 918                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 919                         continue;
 920                 /* conflicts.. */
 921                 mutex_unlock(&register_mutex);
 922                 return -EBUSY;
 923         }
 924         list_add_tail(&timer->device_list, &timer1->device_list);
 925         mutex_unlock(&register_mutex);
 926         return 0;
 927 }
 928
 929 static int snd_timer_dev_disconnect(struct snd_device *device)
 930 {
 931         struct snd_timer *timer = device->device_data;
 932         mutex_lock(&register_mutex);
 933         list_del_init(&timer->device_list);
 934         mutex_unlock(&register_mutex);
 935         return 0;
 936 }
 937
 938 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 939 {
 940         unsigned long flags;
 941         unsigned long resolution = 0;
 942         struct snd_timer_instance *ti, *ts;
 943
 944         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 945                 return;
 946         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 947                        event > SNDRV_TIMER_EVENT_MRESUME))
 948                 return;
 949         spin_lock_irqsave(&timer->lock, flags);
 950         if (event == SNDRV_TIMER_EVENT_MSTART ||
 951             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 952             event == SNDRV_TIMER_EVENT_MRESUME) {
 953                 if (timer->hw.c_resolution)
 954                         resolution = timer->hw.c_resolution(timer);
 955                 else
 956                         resolution = timer->hw.resolution;
 957         }
 958         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 959                 if (ti->ccallback)
 960                         ti->ccallback(ti, event, tstamp, resolution);
 961                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 962                         if (ts->ccallback)
 963                                 ts->ccallback(ts, event, tstamp, resolution);
 964         }
 965         spin_unlock_irqrestore(&timer->lock, flags);
 966 }
 967
 968 /*
 969  * exported functions for global timers
 970  */
 971 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 972 {
 973         struct snd_timer_id tid;
 974
 975         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 976         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 977         tid.card = -1;
 978         tid.device = device;
 979         tid.subdevice = 0;
 980         return snd_timer_new(NULL, id, &tid, rtimer);
 981 }
 982
 983 int snd_timer_global_free(struct snd_timer *timer)
 984 {
 985         return snd_timer_free(timer);
 986 }
 987
 988 int snd_timer_global_register(struct snd_timer *timer)
 989 {
 990         struct snd_device dev;
 991
 992         memset(&dev, 0, sizeof(dev));
 993         dev.device_data = timer;
 994         return snd_timer_dev_register(&dev);
 995 }
 996
 997 /*
 998  *  System timer
 999  */
1000
1001 struct snd_timer_system_private {
1002         struct timer_list tlist;
1003         unsigned long last_expires;
1004         unsigned long last_jiffies;
1005         unsigned long correction;
1006 };
1007
1008 static void snd_timer_s_function(unsigned long data)
1009 {
1010         struct snd_timer *timer = (struct snd_timer *)data;
1011         struct snd_timer_system_private *priv = timer->private_data;
1012         unsigned long jiff = jiffies;
1013         if (time_after(jiff, priv->last_expires))
1014                 priv->correction += (long)jiff - (long)priv->last_expires;
1015         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1016 }
1017
1018 static int snd_timer_s_start(struct snd_timer * timer)
1019 {
1020         struct snd_timer_system_private *priv;
1021         unsigned long njiff;
1022
1023         priv = (struct snd_timer_system_private *) timer->private_data;
1024         njiff = (priv->last_jiffies = jiffies);
1025         if (priv->correction > timer->sticks - 1) {
1026                 priv->correction -= timer->sticks - 1;
1027                 njiff++;
1028         } else {
1029                 njiff += timer->sticks - priv->correction;
1030                 priv->correction = 0;
1031         }
1032         priv->last_expires = njiff;
1033         mod_timer(&priv->tlist, njiff);
1034         return 0;
1035 }
1036
1037 static int snd_timer_s_stop(struct snd_timer * timer)
1038 {
1039         struct snd_timer_system_private *priv;
1040         unsigned long jiff;
1041
1042         priv = (struct snd_timer_system_private *) timer->private_data;
1043         del_timer(&priv->tlist);
1044         jiff = jiffies;
1045         if (time_before(jiff, priv->last_expires))
1046                 timer->sticks = priv->last_expires - jiff;
1047         else
1048                 timer->sticks = 1;
1049         priv->correction = 0;
1050         return 0;
1051 }
1052
1053 static struct snd_timer_hardware snd_timer_system =
1054 {
1055         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1056         .resolution =   1000000000L / HZ,
1057         .ticks =        10000000L,
1058         .start =        snd_timer_s_start,
1059         .stop =         snd_timer_s_stop
1060 };
1061
1062 static void snd_timer_free_system(struct snd_timer *timer)
1063 {
1064         kfree(timer->private_data);
1065 }
1066
1067 static int snd_timer_register_system(void)
1068 {
1069         struct snd_timer *timer;
1070         struct snd_timer_system_private *priv;
1071         int err;
1072
1073         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1074         if (err < 0)
1075                 return err;
1076         strcpy(timer->name, "system timer");
1077         timer->hw = snd_timer_system;
1078         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1079         if (priv == NULL) {
1080                 snd_timer_free(timer);
1081                 return -ENOMEM;
1082         }
1083         init_timer(&priv->tlist);
1084         priv->tlist.function = snd_timer_s_function;
1085         priv->tlist.data = (unsigned long) timer;
1086         timer->private_data = priv;
1087         timer->private_free = snd_timer_free_system;
1088         return snd_timer_global_register(timer);
1089 }
1090
1091 #ifdef CONFIG_PROC_FS
1092 /*
1093  *  Info interface
1094  */
1095
1096 static void snd_timer_proc_read(struct snd_info_entry *entry,
1097                                 struct snd_info_buffer *buffer)
1098 {
1099         struct snd_timer *timer;
1100         struct snd_timer_instance *ti;
1101
1102         mutex_lock(&register_mutex);
1103         list_for_each_entry(timer, &snd_timer_list, device_list) {
1104                 switch (timer->tmr_class) {
1105                 case SNDRV_TIMER_CLASS_GLOBAL:
1106                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1107                         break;
1108                 case SNDRV_TIMER_CLASS_CARD:
1109                         snd_iprintf(buffer, "C%i-%i: ",
1110                                     timer->card->number, timer->tmr_device);
1111                         break;
1112                 case SNDRV_TIMER_CLASS_PCM:
1113                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1114                                     timer->tmr_device, timer->tmr_subdevice);
1115                         break;
1116                 default:
1117                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1118                                     timer->card ? timer->card->number : -1,
1119                                     timer->tmr_device, timer->tmr_subdevice);
1120                 }
1121                 snd_iprintf(buffer, "%s :", timer->name);
1122                 if (timer->hw.resolution)
1123                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1124                                     timer->hw.resolution / 1000,
1125                                     timer->hw.resolution % 1000,
1126                                     timer->hw.ticks);
1127                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1128                         snd_iprintf(buffer, " SLAVE");
1129                 snd_iprintf(buffer, "\n");
1130                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1131                         snd_iprintf(buffer, "  Client %s : %s\n",
1132                                     ti->owner ? ti->owner : "unknown",
1133                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1134                                                  SNDRV_TIMER_IFLG_RUNNING)
1135                                     ? "running" : "stopped");
1136         }
1137         mutex_unlock(&register_mutex);
1138 }
1139
1140 static struct snd_info_entry *snd_timer_proc_entry;
1141
1142 static void __init snd_timer_proc_init(void)
1143 {
1144         struct snd_info_entry *entry;
1145
1146         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1147         if (entry != NULL) {
1148                 entry->c.text.read = snd_timer_proc_read;
1149                 if (snd_info_register(entry) < 0) {
1150                         snd_info_free_entry(entry);
1151                         entry = NULL;
1152                 }
1153         }
1154         snd_timer_proc_entry = entry;
1155 }
1156
1157 static void __exit snd_timer_proc_done(void)
1158 {
1159         snd_info_free_entry(snd_timer_proc_entry);
1160 }
1161 #else /* !CONFIG_PROC_FS */
1162 #define snd_timer_proc_init()
1163 #define snd_timer_proc_done()
1164 #endif
1165
1166 /*
1167  *  USER SPACE interface
1168  */
1169
1170 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1171                                      unsigned long resolution,
1172                                      unsigned long ticks)
1173 {
1174         struct snd_timer_user *tu = timeri->callback_data;
1175         struct snd_timer_read *r;
1176         int prev;
1177
1178         spin_lock(&tu->qlock);
1179         if (tu->qused > 0) {
1180                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1181                 r = &tu->queue[prev];
1182                 if (r->resolution == resolution) {
1183                         r->ticks += ticks;
1184                         goto __wake;
1185                 }
1186         }
1187         if (tu->qused >= tu->queue_size) {
1188                 tu->overrun++;
1189         } else {
1190                 r = &tu->queue[tu->qtail++];
1191                 tu->qtail %= tu->queue_size;
1192                 r->resolution = resolution;
1193                 r->ticks = ticks;
1194                 tu->qused++;
1195         }
1196       __wake:
1197         spin_unlock(&tu->qlock);
1198         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1199         wake_up(&tu->qchange_sleep);
1200 }
1201
1202 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1203                                             struct snd_timer_tread *tread)
1204 {
1205         if (tu->qused >= tu->queue_size) {
1206                 tu->overrun++;
1207         } else {
1208                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1209                 tu->qtail %= tu->queue_size;
1210                 tu->qused++;
1211         }
1212 }
1213
1214 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1215                                      int event,
1216                                      struct timespec *tstamp,
1217                                      unsigned long resolution)
1218 {
1219         struct snd_timer_user *tu = timeri->callback_data;
1220         struct snd_timer_tread r1;
1221         unsigned long flags;
1222
1223         if (event >= SNDRV_TIMER_EVENT_START &&
1224             event <= SNDRV_TIMER_EVENT_PAUSE)
1225                 tu->tstamp = *tstamp;
1226         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1227                 return;
1228         memset(&r1, 0, sizeof(r1));
1229         r1.event = event;
1230         r1.tstamp = *tstamp;
1231         r1.val = resolution;
1232         spin_lock_irqsave(&tu->qlock, flags);
1233         snd_timer_user_append_to_tqueue(tu, &r1);
1234         spin_unlock_irqrestore(&tu->qlock, flags);
1235         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1236         wake_up(&tu->qchange_sleep);
1237 }
1238
1239 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1240                                       unsigned long resolution,
1241                                       unsigned long ticks)
1242 {
1243         struct snd_timer_user *tu = timeri->callback_data;
1244         struct snd_timer_tread *r, r1;
1245         struct timespec tstamp;
1246         int prev, append = 0;
1247
1248         memset(&tstamp, 0, sizeof(tstamp));
1249         spin_lock(&tu->qlock);
1250         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1251                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1252                 spin_unlock(&tu->qlock);
1253                 return;
1254         }
1255         if (tu->last_resolution != resolution || ticks > 0) {
1256                 if (timer_tstamp_monotonic)
1257                         do_posix_clock_monotonic_gettime(&tstamp);
1258                 else
1259                         getnstimeofday(&tstamp);
1260         }
1261         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1262             tu->last_resolution != resolution) {
1263                 memset(&r1, 0, sizeof(r1));
1264                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1265                 r1.tstamp = tstamp;
1266                 r1.val = resolution;
1267                 snd_timer_user_append_to_tqueue(tu, &r1);
1268                 tu->last_resolution = resolution;
1269                 append++;
1270         }
1271         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1272                 goto __wake;
1273         if (ticks == 0)
1274                 goto __wake;
1275         if (tu->qused > 0) {
1276                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1277                 r = &tu->tqueue[prev];
1278                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1279                         r->tstamp = tstamp;
1280                         r->val += ticks;
1281                         append++;
1282                         goto __wake;
1283                 }
1284         }
1285         r1.event = SNDRV_TIMER_EVENT_TICK;
1286         r1.tstamp = tstamp;
1287         r1.val = ticks;
1288         snd_timer_user_append_to_tqueue(tu, &r1);
1289         append++;
1290       __wake:
1291         spin_unlock(&tu->qlock);
1292         if (append == 0)
1293                 return;
1294         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1295         wake_up(&tu->qchange_sleep);
1296 }
1297
1298 static int snd_timer_user_open(struct inode *inode, struct file *file)
1299 {
1300         struct snd_timer_user *tu;
1301         int err;
1302
1303         err = nonseekable_open(inode, file);
1304         if (err < 0)
1305                 return err;
1306
1307         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1308         if (tu == NULL)
1309                 return -ENOMEM;
1310         spin_lock_init(&tu->qlock);
1311         init_waitqueue_head(&tu->qchange_sleep);
1312         mutex_init(&tu->ioctl_lock);
1313         tu->ticks = 1;
1314         tu->queue_size = 128;
1315         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1316                             GFP_KERNEL);
1317         if (tu->queue == NULL) {
1318                 kfree(tu);
1319                 return -ENOMEM;
1320         }
1321         file->private_data = tu;
1322         return 0;
1323 }
1324
1325 static int snd_timer_user_release(struct inode *inode, struct file *file)
1326 {
1327         struct snd_timer_user *tu;
1328
1329         if (file->private_data) {
1330                 tu = file->private_data;
1331                 file->private_data = NULL;
1332                 mutex_lock(&tu->ioctl_lock);
1333                 if (tu->timeri)
1334                         snd_timer_close(tu->timeri);
1335                 mutex_unlock(&tu->ioctl_lock);
1336                 kfree(tu->queue);
1337                 kfree(tu->tqueue);
1338                 kfree(tu);
1339         }
1340         return 0;
1341 }
1342
1343 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1344 {
1345         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1346         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1347         id->card = -1;
1348         id->device = -1;
1349         id->subdevice = -1;
1350 }
1351
1352 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1353 {
1354         id->dev_class = timer->tmr_class;
1355         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1356         id->card = timer->card ? timer->card->number : -1;
1357         id->device = timer->tmr_device;
1358         id->subdevice = timer->tmr_subdevice;
1359 }
1360
1361 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1362 {
1363         struct snd_timer_id id;
1364         struct snd_timer *timer;
1365         struct list_head *p;
1366
1367         if (copy_from_user(&id, _tid, sizeof(id)))
1368                 return -EFAULT;
1369         mutex_lock(&register_mutex);
1370         if (id.dev_class < 0) {         /* first item */
1371                 if (list_empty(&snd_timer_list))
1372                         snd_timer_user_zero_id(&id);
1373                 else {
1374                         timer = list_entry(snd_timer_list.next,
1375                                            struct snd_timer, device_list);
1376                         snd_timer_user_copy_id(&id, timer);
1377                 }
1378         } else {
1379                 switch (id.dev_class) {
1380                 case SNDRV_TIMER_CLASS_GLOBAL:
1381                         id.device = id.device < 0 ? 0 : id.device + 1;
1382                         list_for_each(p, &snd_timer_list) {
1383                                 timer = list_entry(p, struct snd_timer, device_list);
1384                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1385                                         snd_timer_user_copy_id(&id, timer);
1386                                         break;
1387                                 }
1388                                 if (timer->tmr_device >= id.device) {
1389                                         snd_timer_user_copy_id(&id, timer);
1390                                         break;
1391                                 }
1392                         }
1393                         if (p == &snd_timer_list)
1394                                 snd_timer_user_zero_id(&id);
1395                         break;
1396                 case SNDRV_TIMER_CLASS_CARD:
1397                 case SNDRV_TIMER_CLASS_PCM:
1398                         if (id.card < 0) {
1399                                 id.card = 0;
1400                         } else {
1401                                 if (id.card < 0) {
1402                                         id.card = 0;
1403                                 } else {
1404                                         if (id.device < 0) {
1405                                                 id.device = 0;
1406                                         } else {
1407                                                 if (id.subdevice < 0) {
1408                                                         id.subdevice = 0;
1409                                                 } else {
1410                                                         id.subdevice++;
1411                                                 }
1412                                         }
1413                                 }
1414                         }
1415                         list_for_each(p, &snd_timer_list) {
1416                                 timer = list_entry(p, struct snd_timer, device_list);
1417                                 if (timer->tmr_class > id.dev_class) {
1418                                         snd_timer_user_copy_id(&id, timer);
1419                                         break;
1420                                 }
1421                                 if (timer->tmr_class < id.dev_class)
1422                                         continue;
1423                                 if (timer->card->number > id.card) {
1424                                         snd_timer_user_copy_id(&id, timer);
1425                                         break;
1426                                 }
1427                                 if (timer->card->number < id.card)
1428                                         continue;
1429                                 if (timer->tmr_device > id.device) {
1430                                         snd_timer_user_copy_id(&id, timer);
1431                                         break;
1432                                 }
1433                                 if (timer->tmr_device < id.device)
1434                                         continue;
1435                                 if (timer->tmr_subdevice > id.subdevice) {
1436                                         snd_timer_user_copy_id(&id, timer);
1437                                         break;
1438                                 }
1439                                 if (timer->tmr_subdevice < id.subdevice)
1440                                         continue;
1441                                 snd_timer_user_copy_id(&id, timer);
1442                                 break;
1443                         }
1444                         if (p == &snd_timer_list)
1445                                 snd_timer_user_zero_id(&id);
1446                         break;
1447                 default:
1448                         snd_timer_user_zero_id(&id);
1449                 }
1450         }
1451         mutex_unlock(&register_mutex);
1452         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1453                 return -EFAULT;
1454         return 0;
1455 }
1456
1457 static int snd_timer_user_ginfo(struct file *file,
1458                                 struct snd_timer_ginfo __user *_ginfo)
1459 {
1460         struct snd_timer_ginfo *ginfo;
1461         struct snd_timer_id tid;
1462         struct snd_timer *t;
1463         struct list_head *p;
1464         int err = 0;
1465
1466         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1467         if (IS_ERR(ginfo))
1468                 return PTR_ERR(ginfo);
1469
1470         tid = ginfo->tid;
1471         memset(ginfo, 0, sizeof(*ginfo));
1472         ginfo->tid = tid;
1473         mutex_lock(&register_mutex);
1474         t = snd_timer_find(&tid);
1475         if (t != NULL) {
1476                 ginfo->card = t->card ? t->card->number : -1;
1477                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1478                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1479                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1480                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1481                 ginfo->resolution = t->hw.resolution;
1482                 if (t->hw.resolution_min > 0) {
1483                         ginfo->resolution_min = t->hw.resolution_min;
1484                         ginfo->resolution_max = t->hw.resolution_max;
1485                 }
1486                 list_for_each(p, &t->open_list_head) {
1487                         ginfo->clients++;
1488                 }
1489         } else {
1490                 err = -ENODEV;
1491         }
1492         mutex_unlock(&register_mutex);
1493         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1494                 err = -EFAULT;
1495         kfree(ginfo);
1496         return err;
1497 }
1498
1499 static int snd_timer_user_gparams(struct file *file,
1500                                   struct snd_timer_gparams __user *_gparams)
1501 {
1502         struct snd_timer_gparams gparams;
1503         struct snd_timer *t;
1504         int err;
1505
1506         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1507                 return -EFAULT;
1508         mutex_lock(&register_mutex);
1509         t = snd_timer_find(&gparams.tid);
1510         if (!t) {
1511                 err = -ENODEV;
1512                 goto _error;
1513         }
1514         if (!list_empty(&t->open_list_head)) {
1515                 err = -EBUSY;
1516                 goto _error;
1517         }
1518         if (!t->hw.set_period) {
1519                 err = -ENOSYS;
1520                 goto _error;
1521         }
1522         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1523 _error:
1524         mutex_unlock(&register_mutex);
1525         return err;
1526 }
1527
1528 static int snd_timer_user_gstatus(struct file *file,
1529                                   struct snd_timer_gstatus __user *_gstatus)
1530 {
1531         struct snd_timer_gstatus gstatus;
1532         struct snd_timer_id tid;
1533         struct snd_timer *t;
1534         int err = 0;
1535
1536         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1537                 return -EFAULT;
1538         tid = gstatus.tid;
1539         memset(&gstatus, 0, sizeof(gstatus));
1540         gstatus.tid = tid;
1541         mutex_lock(&register_mutex);
1542         t = snd_timer_find(&tid);
1543         if (t != NULL) {
1544                 if (t->hw.c_resolution)
1545                         gstatus.resolution = t->hw.c_resolution(t);
1546                 else
1547                         gstatus.resolution = t->hw.resolution;
1548                 if (t->hw.precise_resolution) {
1549                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1550                                                  &gstatus.resolution_den);
1551                 } else {
1552                         gstatus.resolution_num = gstatus.resolution;
1553                         gstatus.resolution_den = 1000000000uL;
1554                 }
1555         } else {
1556                 err = -ENODEV;
1557         }
1558         mutex_unlock(&register_mutex);
1559         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1560                 err = -EFAULT;
1561         return err;
1562 }
1563
1564 static int snd_timer_user_tselect(struct file *file,
1565                                   struct snd_timer_select __user *_tselect)
1566 {
1567         struct snd_timer_user *tu;
1568         struct snd_timer_select tselect;
1569         char str[32];
1570         int err = 0;
1571
1572         tu = file->private_data;
1573         if (tu->timeri) {
1574                 snd_timer_close(tu->timeri);
1575                 tu->timeri = NULL;
1576         }
1577         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1578                 err = -EFAULT;
1579                 goto __err;
1580         }
1581         sprintf(str, "application %i", current->pid);
1582         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1583                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1584         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1585         if (err < 0)
1586                 goto __err;
1587
1588         kfree(tu->queue);
1589         tu->queue = NULL;
1590         kfree(tu->tqueue);
1591         tu->tqueue = NULL;
1592         if (tu->tread) {
1593                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1594                                      GFP_KERNEL);
1595                 if (tu->tqueue == NULL)
1596                         err = -ENOMEM;
1597         } else {
1598                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1599                                     GFP_KERNEL);
1600                 if (tu->queue == NULL)
1601                         err = -ENOMEM;
1602         }
1603
1604         if (err < 0) {
1605                 snd_timer_close(tu->timeri);
1606                 tu->timeri = NULL;
1607         } else {
1608                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1609                 tu->timeri->callback = tu->tread
1610                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1611                 tu->timeri->ccallback = snd_timer_user_ccallback;
1612                 tu->timeri->callback_data = (void *)tu;
1613         }
1614
1615       __err:
1616         return err;
1617 }
1618
1619 static int snd_timer_user_info(struct file *file,
1620                                struct snd_timer_info __user *_info)
1621 {
1622         struct snd_timer_user *tu;
1623         struct snd_timer_info *info;
1624         struct snd_timer *t;
1625         int err = 0;
1626
1627         tu = file->private_data;
1628         if (!tu->timeri)
1629                 return -EBADFD;
1630         t = tu->timeri->timer;
1631         if (!t)
1632                 return -EBADFD;
1633
1634         info = kzalloc(sizeof(*info), GFP_KERNEL);
1635         if (! info)
1636                 return -ENOMEM;
1637         info->card = t->card ? t->card->number : -1;
1638         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1639                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1640         strlcpy(info->id, t->id, sizeof(info->id));
1641         strlcpy(info->name, t->name, sizeof(info->name));
1642         info->resolution = t->hw.resolution;
1643         if (copy_to_user(_info, info, sizeof(*_info)))
1644                 err = -EFAULT;
1645         kfree(info);
1646         return err;
1647 }
1648
1649 static int snd_timer_user_params(struct file *file,
1650                                  struct snd_timer_params __user *_params)
1651 {
1652         struct snd_timer_user *tu;
1653         struct snd_timer_params params;
1654         struct snd_timer *t;
1655         struct snd_timer_read *tr;
1656         struct snd_timer_tread *ttr;
1657         int err;
1658
1659         tu = file->private_data;
1660         if (!tu->timeri)
1661                 return -EBADFD;
1662         t = tu->timeri->timer;
1663         if (!t)
1664                 return -EBADFD;
1665         if (copy_from_user(&params, _params, sizeof(params)))
1666                 return -EFAULT;
1667         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1668                 err = -EINVAL;
1669                 goto _end;
1670         }
1671         if (params.queue_size > 0 &&
1672             (params.queue_size < 32 || params.queue_size > 1024)) {
1673                 err = -EINVAL;
1674                 goto _end;
1675         }
1676         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1677                               (1<<SNDRV_TIMER_EVENT_TICK)|
1678                               (1<<SNDRV_TIMER_EVENT_START)|
1679                               (1<<SNDRV_TIMER_EVENT_STOP)|
1680                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1681                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1682                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1683                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1684                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1685                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1686                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1687                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1688                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1689                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1690                 err = -EINVAL;
1691                 goto _end;
1692         }
1693         snd_timer_stop(tu->timeri);
1694         spin_lock_irq(&t->lock);
1695         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1696                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1697                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1698         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1699                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1700         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1701                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1702         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1703                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1704         spin_unlock_irq(&t->lock);
1705         if (params.queue_size > 0 &&
1706             (unsigned int)tu->queue_size != params.queue_size) {
1707                 if (tu->tread) {
1708                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1709                                       GFP_KERNEL);
1710                         if (ttr) {
1711                                 kfree(tu->tqueue);
1712                                 tu->queue_size = params.queue_size;
1713                                 tu->tqueue = ttr;
1714                         }
1715                 } else {
1716                         tr = kmalloc(params.queue_size * sizeof(*tr),
1717                                      GFP_KERNEL);
1718                         if (tr) {
1719                                 kfree(tu->queue);
1720                                 tu->queue_size = params.queue_size;
1721                                 tu->queue = tr;
1722                         }
1723                 }
1724         }
1725         tu->qhead = tu->qtail = tu->qused = 0;
1726         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1727                 if (tu->tread) {
1728                         struct snd_timer_tread tread;
1729                         memset(&tread, 0, sizeof(tread));
1730                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1731                         tread.tstamp.tv_sec = 0;
1732                         tread.tstamp.tv_nsec = 0;
1733                         tread.val = 0;
1734                         snd_timer_user_append_to_tqueue(tu, &tread);
1735                 } else {
1736                         struct snd_timer_read *r = &tu->queue[0];
1737                         r->resolution = 0;
1738                         r->ticks = 0;
1739                         tu->qused++;
1740                         tu->qtail++;
1741                 }
1742         }
1743         tu->filter = params.filter;
1744         tu->ticks = params.ticks;
1745         err = 0;
1746  _end:
1747         if (copy_to_user(_params, &params, sizeof(params)))
1748                 return -EFAULT;
1749         return err;
1750 }
1751
1752 static int snd_timer_user_status(struct file *file,
1753                                  struct snd_timer_status __user *_status)
1754 {
1755         struct snd_timer_user *tu;
1756         struct snd_timer_status status;
1757
1758         tu = file->private_data;
1759         if (!tu->timeri)
1760                 return -EBADFD;
1761         memset(&status, 0, sizeof(status));
1762         status.tstamp = tu->tstamp;
1763         status.resolution = snd_timer_resolution(tu->timeri);
1764         status.lost = tu->timeri->lost;
1765         status.overrun = tu->overrun;
1766         spin_lock_irq(&tu->qlock);
1767         status.queue = tu->qused;
1768         spin_unlock_irq(&tu->qlock);
1769         if (copy_to_user(_status, &status, sizeof(status)))
1770                 return -EFAULT;
1771         return 0;
1772 }
1773
1774 static int snd_timer_user_start(struct file *file)
1775 {
1776         int err;
1777         struct snd_timer_user *tu;
1778
1779         tu = file->private_data;
1780         if (!tu->timeri)
1781                 return -EBADFD;
1782         snd_timer_stop(tu->timeri);
1783         tu->timeri->lost = 0;
1784         tu->last_resolution = 0;
1785         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1786 }
1787
1788 static int snd_timer_user_stop(struct file *file)
1789 {
1790         int err;
1791         struct snd_timer_user *tu;
1792
1793         tu = file->private_data;
1794         if (!tu->timeri)
1795                 return -EBADFD;
1796         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1797 }
1798
1799 static int snd_timer_user_continue(struct file *file)
1800 {
1801         int err;
1802         struct snd_timer_user *tu;
1803
1804         tu = file->private_data;
1805         if (!tu->timeri)
1806                 return -EBADFD;
1807         tu->timeri->lost = 0;
1808         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1809 }
1810
1811 static int snd_timer_user_pause(struct file *file)
1812 {
1813         int err;
1814         struct snd_timer_user *tu;
1815
1816         tu = file->private_data;
1817         if (!tu->timeri)
1818                 return -EBADFD;
1819         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1820 }
1821
1822 enum {
1823         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1824         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1825         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1826         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1827 };
1828
1829 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1830                                  unsigned long arg)
1831 {
1832         struct snd_timer_user *tu;
1833         void __user *argp = (void __user *)arg;
1834         int __user *p = argp;
1835
1836         tu = file->private_data;
1837         switch (cmd) {
1838         case SNDRV_TIMER_IOCTL_PVERSION:
1839                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1840         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1841                 return snd_timer_user_next_device(argp);
1842         case SNDRV_TIMER_IOCTL_TREAD:
1843         {
1844                 int xarg;
1845
1846                 if (tu->timeri) /* too late */
1847                         return -EBUSY;
1848                 if (get_user(xarg, p))
1849                         return -EFAULT;
1850                 tu->tread = xarg ? 1 : 0;
1851                 return 0;
1852         }
1853         case SNDRV_TIMER_IOCTL_GINFO:
1854                 return snd_timer_user_ginfo(file, argp);
1855         case SNDRV_TIMER_IOCTL_GPARAMS:
1856                 return snd_timer_user_gparams(file, argp);
1857         case SNDRV_TIMER_IOCTL_GSTATUS:
1858                 return snd_timer_user_gstatus(file, argp);
1859         case SNDRV_TIMER_IOCTL_SELECT:
1860                 return snd_timer_user_tselect(file, argp);
1861         case SNDRV_TIMER_IOCTL_INFO:
1862                 return snd_timer_user_info(file, argp);
1863         case SNDRV_TIMER_IOCTL_PARAMS:
1864                 return snd_timer_user_params(file, argp);
1865         case SNDRV_TIMER_IOCTL_STATUS:
1866                 return snd_timer_user_status(file, argp);
1867         case SNDRV_TIMER_IOCTL_START:
1868         case SNDRV_TIMER_IOCTL_START_OLD:
1869                 return snd_timer_user_start(file);
1870         case SNDRV_TIMER_IOCTL_STOP:
1871         case SNDRV_TIMER_IOCTL_STOP_OLD:
1872                 return snd_timer_user_stop(file);
1873         case SNDRV_TIMER_IOCTL_CONTINUE:
1874         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1875                 return snd_timer_user_continue(file);
1876         case SNDRV_TIMER_IOCTL_PAUSE:
1877         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1878                 return snd_timer_user_pause(file);
1879         }
1880         return -ENOTTY;
1881 }
1882
1883 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1884                                  unsigned long arg)
1885 {
1886         struct snd_timer_user *tu = file->private_data;
1887         long ret;
1888
1889         mutex_lock(&tu->ioctl_lock);
1890         ret = __snd_timer_user_ioctl(file, cmd, arg);
1891         mutex_unlock(&tu->ioctl_lock);
1892         return ret;
1893 }
1894
1895 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1896 {
1897         struct snd_timer_user *tu;
1898
1899         tu = file->private_data;
1900         return fasync_helper(fd, file, on, &tu->fasync);
1901 }
1902
1903 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1904                                    size_t count, loff_t *offset)
1905 {
1906         struct snd_timer_user *tu;
1907         long result = 0, unit;
1908         int qhead;
1909         int err = 0;
1910
1911         tu = file->private_data;
1912         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1913         spin_lock_irq(&tu->qlock);
1914         while ((long)count - result >= unit) {
1915                 while (!tu->qused) {
1916                         wait_queue_t wait;
1917
1918                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1919                                 err = -EAGAIN;
1920                                 goto _error;
1921                         }
1922
1923                         set_current_state(TASK_INTERRUPTIBLE);
1924                         init_waitqueue_entry(&wait, current);
1925                         add_wait_queue(&tu->qchange_sleep, &wait);
1926
1927                         spin_unlock_irq(&tu->qlock);
1928                         schedule();
1929                         spin_lock_irq(&tu->qlock);
1930
1931                         remove_wait_queue(&tu->qchange_sleep, &wait);
1932
1933                         if (signal_pending(current)) {
1934                                 err = -ERESTARTSYS;
1935                                 goto _error;
1936                         }
1937                 }
1938
1939                 qhead = tu->qhead++;
1940                 tu->qhead %= tu->queue_size;
1941                 tu->qused--;
1942                 spin_unlock_irq(&tu->qlock);
1943
1944                 mutex_lock(&tu->ioctl_lock);
1945                 if (tu->tread) {
1946                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1947                                          sizeof(struct snd_timer_tread)))
1948                                 err = -EFAULT;
1949                 } else {
1950                         if (copy_to_user(buffer, &tu->queue[qhead],
1951                                          sizeof(struct snd_timer_read)))
1952                                 err = -EFAULT;
1953                 }
1954                 mutex_unlock(&tu->ioctl_lock);
1955
1956                 spin_lock_irq(&tu->qlock);
1957                 if (err < 0)
1958                         goto _error;
1959                 result += unit;
1960                 buffer += unit;
1961         }
1962  _error:
1963         spin_unlock_irq(&tu->qlock);
1964         return result > 0 ? result : err;
1965 }
1966
1967 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1968 {
1969         unsigned int mask;
1970         struct snd_timer_user *tu;
1971
1972         tu = file->private_data;
1973
1974         poll_wait(file, &tu->qchange_sleep, wait);
1975
1976         mask = 0;
1977         if (tu->qused)
1978                 mask |= POLLIN | POLLRDNORM;
1979
1980         return mask;
1981 }
1982
1983 #ifdef CONFIG_COMPAT
1984 #include "timer_compat.c"
1985 #else
1986 #define snd_timer_user_ioctl_compat     NULL
1987 #endif
1988
1989 static const struct file_operations snd_timer_f_ops =
1990 {
1991         .owner =        THIS_MODULE,
1992         .read =         snd_timer_user_read,
1993         .open =         snd_timer_user_open,
1994         .release =      snd_timer_user_release,
1995         .llseek =       no_llseek,
1996         .poll =         snd_timer_user_poll,
1997         .unlocked_ioctl =       snd_timer_user_ioctl,
1998         .compat_ioctl = snd_timer_user_ioctl_compat,
1999         .fasync =       snd_timer_user_fasync,
2000 };
2001
2002 /*
2003  *  ENTRY functions
2004  */
2005
2006 static int __init alsa_timer_init(void)
2007 {
2008         int err;
2009
2010 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2011         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2012                               "system timer");
2013 #endif
2014
2015         if ((err = snd_timer_register_system()) < 0)
2016                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
2017                            err);
2018         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2019                                        &snd_timer_f_ops, NULL, "timer")) < 0)
2020                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
2021                            err);
2022         snd_timer_proc_init();
2023         return 0;
2024 }
2025
2026 static void __exit alsa_timer_exit(void)
2027 {
2028         struct list_head *p, *n;
2029
2030         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
2031         /* unregister the system timer */
2032         list_for_each_safe(p, n, &snd_timer_list) {
2033                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
2034                 snd_timer_free(timer);
2035         }
2036         snd_timer_proc_done();
2037 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2038         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2039 #endif
2040 }
2041
2042 module_init(alsa_timer_init)
2043 module_exit(alsa_timer_exit)
2044
2045 EXPORT_SYMBOL(snd_timer_open);
2046 EXPORT_SYMBOL(snd_timer_close);
2047 EXPORT_SYMBOL(snd_timer_resolution);
2048 EXPORT_SYMBOL(snd_timer_start);
2049 EXPORT_SYMBOL(snd_timer_stop);
2050 EXPORT_SYMBOL(snd_timer_continue);
2051 EXPORT_SYMBOL(snd_timer_pause);
2052 EXPORT_SYMBOL(snd_timer_new);
2053 EXPORT_SYMBOL(snd_timer_notify);
2054 EXPORT_SYMBOL(snd_timer_global_new);
2055 EXPORT_SYMBOL(snd_timer_global_free);
2056 EXPORT_SYMBOL(snd_timer_global_register);
2057 EXPORT_SYMBOL(snd_timer_interrupt);