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