kernel/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/device.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <sound/core.h>
  31 #include <sound/timer.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/minors.h>
  35 #include <sound/initval.h>
  36 #include <linux/kmod.h>
  37
  38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
  39 #define DEFAULT_TIMER_LIMIT 4
  40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER)
  41 #define DEFAULT_TIMER_LIMIT 2
  42 #else
  43 #define DEFAULT_TIMER_LIMIT 1
  44 #endif
  45
  46 static int timer_limit = DEFAULT_TIMER_LIMIT;
  47 static int timer_tstamp_monotonic = 1;
  48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  49 MODULE_DESCRIPTION("ALSA timer interface");
  50 MODULE_LICENSE("GPL");
  51 module_param(timer_limit, int, 0444);
  52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  53 module_param(timer_tstamp_monotonic, int, 0444);
  54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  55
  56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  57 MODULE_ALIAS("devname:snd/timer");
  58
  59 struct snd_timer_user {
  60         struct snd_timer_instance *timeri;
  61         int tread;              /* enhanced read with timestamps and events */
  62         unsigned long ticks;
  63         unsigned long overrun;
  64         int qhead;
  65         int qtail;
  66         int qused;
  67         int queue_size;
  68         bool disconnected;
  69         struct snd_timer_read *queue;
  70         struct snd_timer_tread *tqueue;
  71         spinlock_t qlock;
  72         unsigned long last_resolution;
  73         unsigned int filter;
  74         struct timespec tstamp;         /* trigger tstamp */
  75         wait_queue_head_t qchange_sleep;
  76         struct fasync_struct *fasync;
  77         struct mutex ioctl_lock;
  78 };
  79
  80 /* list of timers */
  81 static LIST_HEAD(snd_timer_list);
  82
  83 /* list of slave instances */
  84 static LIST_HEAD(snd_timer_slave_list);
  85
  86 /* lock for slave active lists */
  87 static DEFINE_SPINLOCK(slave_active_lock);
  88
  89 static DEFINE_MUTEX(register_mutex);
  90
  91 static int snd_timer_free(struct snd_timer *timer);
  92 static int snd_timer_dev_free(struct snd_device *device);
  93 static int snd_timer_dev_register(struct snd_device *device);
  94 static int snd_timer_dev_disconnect(struct snd_device *device);
  95
  96 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  97
  98 /*
  99  * create a timer instance with the given owner string.
 100  * when timer is not NULL, increments the module counter
 101  */
 102 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 103                                                          struct snd_timer *timer)
 104 {
 105         struct snd_timer_instance *timeri;
 106         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 107         if (timeri == NULL)
 108                 return NULL;
 109         timeri->owner = kstrdup(owner, GFP_KERNEL);
 110         if (! timeri->owner) {
 111                 kfree(timeri);
 112                 return NULL;
 113         }
 114         INIT_LIST_HEAD(&timeri->open_list);
 115         INIT_LIST_HEAD(&timeri->active_list);
 116         INIT_LIST_HEAD(&timeri->ack_list);
 117         INIT_LIST_HEAD(&timeri->slave_list_head);
 118         INIT_LIST_HEAD(&timeri->slave_active_head);
 119
 120         timeri->timer = timer;
 121         if (timer && !try_module_get(timer->module)) {
 122                 kfree(timeri->owner);
 123                 kfree(timeri);
 124                 return NULL;
 125         }
 126
 127         return timeri;
 128 }
 129
 130 /*
 131  * find a timer instance from the given timer id
 132  */
 133 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 134 {
 135         struct snd_timer *timer = NULL;
 136
 137         list_for_each_entry(timer, &snd_timer_list, device_list) {
 138                 if (timer->tmr_class != tid->dev_class)
 139                         continue;
 140                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 141                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 142                     (timer->card == NULL ||
 143                      timer->card->number != tid->card))
 144                         continue;
 145                 if (timer->tmr_device != tid->device)
 146                         continue;
 147                 if (timer->tmr_subdevice != tid->subdevice)
 148                         continue;
 149                 return timer;
 150         }
 151         return NULL;
 152 }
 153
 154 #ifdef CONFIG_MODULES
 155
 156 static void snd_timer_request(struct snd_timer_id *tid)
 157 {
 158         switch (tid->dev_class) {
 159         case SNDRV_TIMER_CLASS_GLOBAL:
 160                 if (tid->device < timer_limit)
 161                         request_module("snd-timer-%i", tid->device);
 162                 break;
 163         case SNDRV_TIMER_CLASS_CARD:
 164         case SNDRV_TIMER_CLASS_PCM:
 165                 if (tid->card < snd_ecards_limit)
 166                         request_module("snd-card-%i", tid->card);
 167                 break;
 168         default:
 169                 break;
 170         }
 171 }
 172
 173 #endif
 174
 175 /*
 176  * look for a master instance matching with the slave id of the given slave.
 177  * when found, relink the open_link of the slave.
 178  *
 179  * call this with register_mutex down.
 180  */
 181 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 182 {
 183         struct snd_timer *timer;
 184         struct snd_timer_instance *master;
 185
 186         /* FIXME: it's really dumb to look up all entries.. */
 187         list_for_each_entry(timer, &snd_timer_list, device_list) {
 188                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 189                         if (slave->slave_class == master->slave_class &&
 190                             slave->slave_id == master->slave_id) {
 191                                 list_move_tail(&slave->open_list,
 192                                                &master->slave_list_head);
 193                                 spin_lock_irq(&slave_active_lock);
 194                                 slave->master = master;
 195                                 slave->timer = master->timer;
 196                                 spin_unlock_irq(&slave_active_lock);
 197                                 return;
 198                         }
 199                 }
 200         }
 201 }
 202
 203 /*
 204  * look for slave instances matching with the slave id of the given master.
 205  * when found, relink the open_link of slaves.
 206  *
 207  * call this with register_mutex down.
 208  */
 209 static void snd_timer_check_master(struct snd_timer_instance *master)
 210 {
 211         struct snd_timer_instance *slave, *tmp;
 212
 213         /* check all pending slaves */
 214         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 215                 if (slave->slave_class == master->slave_class &&
 216                     slave->slave_id == master->slave_id) {
 217                         list_move_tail(&slave->open_list, &master->slave_list_head);
 218                         spin_lock_irq(&slave_active_lock);
 219                         spin_lock(&master->timer->lock);
 220                         slave->master = master;
 221                         slave->timer = master->timer;
 222                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 223                                 list_add_tail(&slave->active_list,
 224                                               &master->slave_active_head);
 225                         spin_unlock(&master->timer->lock);
 226                         spin_unlock_irq(&slave_active_lock);
 227                 }
 228         }
 229 }
 230
 231 /*
 232  * open a timer instance
 233  * when opening a master, the slave id must be here given.
 234  */
 235 int snd_timer_open(struct snd_timer_instance **ti,
 236                    char *owner, struct snd_timer_id *tid,
 237                    unsigned int slave_id)
 238 {
 239         struct snd_timer *timer;
 240         struct snd_timer_instance *timeri = NULL;
 241
 242         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 243                 /* open a slave instance */
 244                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 245                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 246                         pr_debug("ALSA: timer: invalid slave class %i\n",
 247                                  tid->dev_sclass);
 248                         return -EINVAL;
 249                 }
 250                 mutex_lock(&register_mutex);
 251                 timeri = snd_timer_instance_new(owner, NULL);
 252                 if (!timeri) {
 253                         mutex_unlock(&register_mutex);
 254                         return -ENOMEM;
 255                 }
 256                 timeri->slave_class = tid->dev_sclass;
 257                 timeri->slave_id = tid->device;
 258                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 259                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 260                 snd_timer_check_slave(timeri);
 261                 mutex_unlock(&register_mutex);
 262                 *ti = timeri;
 263                 return 0;
 264         }
 265
 266         /* open a master instance */
 267         mutex_lock(&register_mutex);
 268         timer = snd_timer_find(tid);
 269 #ifdef CONFIG_MODULES
 270         if (!timer) {
 271                 mutex_unlock(&register_mutex);
 272                 snd_timer_request(tid);
 273                 mutex_lock(&register_mutex);
 274                 timer = snd_timer_find(tid);
 275         }
 276 #endif
 277         if (!timer) {
 278                 mutex_unlock(&register_mutex);
 279                 return -ENODEV;
 280         }
 281         if (!list_empty(&timer->open_list_head)) {
 282                 timeri = list_entry(timer->open_list_head.next,
 283                                     struct snd_timer_instance, open_list);
 284                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 285                         mutex_unlock(&register_mutex);
 286                         return -EBUSY;
 287                 }
 288         }
 289         timeri = snd_timer_instance_new(owner, timer);
 290         if (!timeri) {
 291                 mutex_unlock(&register_mutex);
 292                 return -ENOMEM;
 293         }
 294         /* take a card refcount for safe disconnection */
 295         if (timer->card)
 296                 get_device(&timer->card->card_dev);
 297         timeri->slave_class = tid->dev_sclass;
 298         timeri->slave_id = slave_id;
 299         if (list_empty(&timer->open_list_head) && timer->hw.open)
 300                 timer->hw.open(timer);
 301         list_add_tail(&timeri->open_list, &timer->open_list_head);
 302         snd_timer_check_master(timeri);
 303         mutex_unlock(&register_mutex);
 304         *ti = timeri;
 305         return 0;
 306 }
 307
 308 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event);
 309
 310 /*
 311  * close a timer instance
 312  */
 313 int snd_timer_close(struct snd_timer_instance *timeri)
 314 {
 315         struct snd_timer *timer = NULL;
 316         struct snd_timer_instance *slave, *tmp;
 317
 318         if (snd_BUG_ON(!timeri))
 319                 return -ENXIO;
 320
 321         /* force to stop the timer */
 322         snd_timer_stop(timeri);
 323
 324         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 325                 /* wait, until the active callback is finished */
 326                 spin_lock_irq(&slave_active_lock);
 327                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 328                         spin_unlock_irq(&slave_active_lock);
 329                         udelay(10);
 330                         spin_lock_irq(&slave_active_lock);
 331                 }
 332                 spin_unlock_irq(&slave_active_lock);
 333                 mutex_lock(&register_mutex);
 334                 list_del(&timeri->open_list);
 335                 mutex_unlock(&register_mutex);
 336         } else {
 337                 timer = timeri->timer;
 338                 if (snd_BUG_ON(!timer))
 339                         goto out;
 340                 /* wait, until the active callback is finished */
 341                 spin_lock_irq(&timer->lock);
 342                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 343                         spin_unlock_irq(&timer->lock);
 344                         udelay(10);
 345                         spin_lock_irq(&timer->lock);
 346                 }
 347                 spin_unlock_irq(&timer->lock);
 348                 mutex_lock(&register_mutex);
 349                 list_del(&timeri->open_list);
 350                 if (list_empty(&timer->open_list_head) &&
 351                     timer->hw.close)
 352                         timer->hw.close(timer);
 353                 /* remove slave links */
 354                 spin_lock_irq(&slave_active_lock);
 355                 spin_lock(&timer->lock);
 356                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 357                                          open_list) {
 358                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 359                         slave->master = NULL;
 360                         slave->timer = NULL;
 361                         list_del_init(&slave->ack_list);
 362                         list_del_init(&slave->active_list);
 363                 }
 364                 spin_unlock(&timer->lock);
 365                 spin_unlock_irq(&slave_active_lock);
 366                 /* release a card refcount for safe disconnection */
 367                 if (timer->card)
 368                         put_device(&timer->card->card_dev);
 369                 mutex_unlock(&register_mutex);
 370         }
 371  out:
 372         if (timeri->private_free)
 373                 timeri->private_free(timeri);
 374         kfree(timeri->owner);
 375         kfree(timeri);
 376         if (timer)
 377                 module_put(timer->module);
 378         return 0;
 379 }
 380
 381 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 382 {
 383         struct snd_timer * timer;
 384
 385         if (timeri == NULL)
 386                 return 0;
 387         if ((timer = timeri->timer) != NULL) {
 388                 if (timer->hw.c_resolution)
 389                         return timer->hw.c_resolution(timer);
 390                 return timer->hw.resolution;
 391         }
 392         return 0;
 393 }
 394
 395 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 396 {
 397         struct snd_timer *timer;
 398         unsigned long flags;
 399         unsigned long resolution = 0;
 400         struct snd_timer_instance *ts;
 401         struct timespec tstamp;
 402
 403         if (timer_tstamp_monotonic)
 404                 ktime_get_ts(&tstamp);
 405         else
 406                 getnstimeofday(&tstamp);
 407         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 408                        event > SNDRV_TIMER_EVENT_PAUSE))
 409                 return;
 410         if (event == SNDRV_TIMER_EVENT_START ||
 411             event == SNDRV_TIMER_EVENT_CONTINUE)
 412                 resolution = snd_timer_resolution(ti);
 413         if (ti->ccallback)
 414                 ti->ccallback(ti, event, &tstamp, resolution);
 415         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 416                 return;
 417         timer = ti->timer;
 418         if (timer == NULL)
 419                 return;
 420         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 421                 return;
 422         spin_lock_irqsave(&timer->lock, flags);
 423         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 424                 if (ts->ccallback)
 425                         ts->ccallback(ts, event + 100, &tstamp, resolution);
 426         spin_unlock_irqrestore(&timer->lock, flags);
 427 }
 428
 429 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
 430                             unsigned long sticks)
 431 {
 432         list_move_tail(&timeri->active_list, &timer->active_list_head);
 433         if (timer->running) {
 434                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 435                         goto __start_now;
 436                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 437                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 438                 return 1;       /* delayed start */
 439         } else {
 440                 timer->sticks = sticks;
 441                 timer->hw.start(timer);
 442               __start_now:
 443                 timer->running++;
 444                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 445                 return 0;
 446         }
 447 }
 448
 449 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
 450 {
 451         unsigned long flags;
 452
 453         spin_lock_irqsave(&slave_active_lock, flags);
 454         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 455                 spin_unlock_irqrestore(&slave_active_lock, flags);
 456                 return -EBUSY;
 457         }
 458         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 459         if (timeri->master && timeri->timer) {
 460                 spin_lock(&timeri->timer->lock);
 461                 list_add_tail(&timeri->active_list,
 462                               &timeri->master->slave_active_head);
 463                 spin_unlock(&timeri->timer->lock);
 464         }
 465         spin_unlock_irqrestore(&slave_active_lock, flags);
 466         return 1; /* delayed start */
 467 }
 468
 469 /*
 470  *  start the timer instance
 471  */
 472 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 473 {
 474         struct snd_timer *timer;
 475         int result = -EINVAL;
 476         unsigned long flags;
 477
 478         if (timeri == NULL || ticks < 1)
 479                 return -EINVAL;
 480         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 481                 result = snd_timer_start_slave(timeri);
 482                 if (result >= 0)
 483                         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 484                 return result;
 485         }
 486         timer = timeri->timer;
 487         if (timer == NULL)
 488                 return -EINVAL;
 489         if (timer->card && timer->card->shutdown)
 490                 return -ENODEV;
 491         spin_lock_irqsave(&timer->lock, flags);
 492         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 493                              SNDRV_TIMER_IFLG_START)) {
 494                 result = -EBUSY;
 495                 goto unlock;
 496         }
 497         timeri->ticks = timeri->cticks = ticks;
 498         timeri->pticks = 0;
 499         result = snd_timer_start1(timer, timeri, ticks);
 500  unlock:
 501         spin_unlock_irqrestore(&timer->lock, flags);
 502         if (result >= 0)
 503                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 504         return result;
 505 }
 506
 507 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event)
 508 {
 509         struct snd_timer *timer;
 510         unsigned long flags;
 511
 512         if (snd_BUG_ON(!timeri))
 513                 return -ENXIO;
 514
 515         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 516                 spin_lock_irqsave(&slave_active_lock, flags);
 517                 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
 518                         spin_unlock_irqrestore(&slave_active_lock, flags);
 519                         return -EBUSY;
 520                 }
 521                 if (timeri->timer)
 522                         spin_lock(&timeri->timer->lock);
 523                 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 524                 list_del_init(&timeri->ack_list);
 525                 list_del_init(&timeri->active_list);
 526                 if (timeri->timer)
 527                         spin_unlock(&timeri->timer->lock);
 528                 spin_unlock_irqrestore(&slave_active_lock, flags);
 529                 goto __end;
 530         }
 531         timer = timeri->timer;
 532         if (!timer)
 533                 return -EINVAL;
 534         spin_lock_irqsave(&timer->lock, flags);
 535         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 536                                SNDRV_TIMER_IFLG_START))) {
 537                 spin_unlock_irqrestore(&timer->lock, flags);
 538                 return -EBUSY;
 539         }
 540         list_del_init(&timeri->ack_list);
 541         list_del_init(&timeri->active_list);
 542         if (timer->card && timer->card->shutdown) {
 543                 spin_unlock_irqrestore(&timer->lock, flags);
 544                 return 0;
 545         }
 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         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 559         spin_unlock_irqrestore(&timer->lock, flags);
 560       __end:
 561         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 562                 snd_timer_notify1(timeri, event);
 563         return 0;
 564 }
 565
 566 /*
 567  * stop the timer instance.
 568  *
 569  * do not call this from the timer callback!
 570  */
 571 int snd_timer_stop(struct snd_timer_instance *timeri)
 572 {
 573         struct snd_timer *timer;
 574         unsigned long flags;
 575         int err;
 576
 577         err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP);
 578         if (err < 0)
 579                 return err;
 580         timer = timeri->timer;
 581         if (!timer)
 582                 return -EINVAL;
 583         spin_lock_irqsave(&timer->lock, flags);
 584         timeri->cticks = timeri->ticks;
 585         timeri->pticks = 0;
 586         spin_unlock_irqrestore(&timer->lock, flags);
 587         return 0;
 588 }
 589
 590 /*
 591  * start again..  the tick is kept.
 592  */
 593 int snd_timer_continue(struct snd_timer_instance *timeri)
 594 {
 595         struct snd_timer *timer;
 596         int result = -EINVAL;
 597         unsigned long flags;
 598
 599         if (timeri == NULL)
 600                 return result;
 601         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 602                 return snd_timer_start_slave(timeri);
 603         timer = timeri->timer;
 604         if (! timer)
 605                 return -EINVAL;
 606         if (timer->card && timer->card->shutdown)
 607                 return -ENODEV;
 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, 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         if (timer->card && timer->card->shutdown)
 677                 return;
 678
 679         spin_lock_irqsave(&timer->lock, flags);
 680         /* now process all callbacks */
 681         while (!list_empty(&timer->sack_list_head)) {
 682                 p = timer->sack_list_head.next;         /* get first item */
 683                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 684
 685                 /* remove from ack_list and make empty */
 686                 list_del_init(p);
 687
 688                 ticks = ti->pticks;
 689                 ti->pticks = 0;
 690                 resolution = ti->resolution;
 691
 692                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 693                 spin_unlock(&timer->lock);
 694                 if (ti->callback)
 695                         ti->callback(ti, resolution, ticks);
 696                 spin_lock(&timer->lock);
 697                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 698         }
 699         spin_unlock_irqrestore(&timer->lock, flags);
 700 }
 701
 702 /*
 703  * timer interrupt
 704  *
 705  * ticks_left is usually equal to timer->sticks.
 706  *
 707  */
 708 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 709 {
 710         struct snd_timer_instance *ti, *ts, *tmp;
 711         unsigned long resolution, ticks;
 712         struct list_head *p, *ack_list_head;
 713         unsigned long flags;
 714         int use_tasklet = 0;
 715
 716         if (timer == NULL)
 717                 return;
 718
 719         if (timer->card && timer->card->shutdown)
 720                 return;
 721
 722         spin_lock_irqsave(&timer->lock, flags);
 723
 724         /* remember the current resolution */
 725         if (timer->hw.c_resolution)
 726                 resolution = timer->hw.c_resolution(timer);
 727         else
 728                 resolution = timer->hw.resolution;
 729
 730         /* loop for all active instances
 731          * Here we cannot use list_for_each_entry because the active_list of a
 732          * processed instance is relinked to done_list_head before the callback
 733          * is called.
 734          */
 735         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 736                                  active_list) {
 737                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 738                         continue;
 739                 ti->pticks += ticks_left;
 740                 ti->resolution = resolution;
 741                 if (ti->cticks < ticks_left)
 742                         ti->cticks = 0;
 743                 else
 744                         ti->cticks -= ticks_left;
 745                 if (ti->cticks) /* not expired */
 746                         continue;
 747                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 748                         ti->cticks = ti->ticks;
 749                 } else {
 750                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 751                         --timer->running;
 752                         list_del_init(&ti->active_list);
 753                 }
 754                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 755                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 756                         ack_list_head = &timer->ack_list_head;
 757                 else
 758                         ack_list_head = &timer->sack_list_head;
 759                 if (list_empty(&ti->ack_list))
 760                         list_add_tail(&ti->ack_list, ack_list_head);
 761                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 762                         ts->pticks = ti->pticks;
 763                         ts->resolution = resolution;
 764                         if (list_empty(&ts->ack_list))
 765                                 list_add_tail(&ts->ack_list, ack_list_head);
 766                 }
 767         }
 768         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 769                 snd_timer_reschedule(timer, timer->sticks);
 770         if (timer->running) {
 771                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 772                         timer->hw.stop(timer);
 773                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 774                 }
 775                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 776                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 777                         /* restart timer */
 778                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 779                         timer->hw.start(timer);
 780                 }
 781         } else {
 782                 timer->hw.stop(timer);
 783         }
 784
 785         /* now process all fast callbacks */
 786         while (!list_empty(&timer->ack_list_head)) {
 787                 p = timer->ack_list_head.next;          /* get first item */
 788                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 789
 790                 /* remove from ack_list and make empty */
 791                 list_del_init(p);
 792
 793                 ticks = ti->pticks;
 794                 ti->pticks = 0;
 795
 796                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 797                 spin_unlock(&timer->lock);
 798                 if (ti->callback)
 799                         ti->callback(ti, resolution, ticks);
 800                 spin_lock(&timer->lock);
 801                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 802         }
 803
 804         /* do we have any slow callbacks? */
 805         use_tasklet = !list_empty(&timer->sack_list_head);
 806         spin_unlock_irqrestore(&timer->lock, flags);
 807
 808         if (use_tasklet)
 809                 tasklet_schedule(&timer->task_queue);
 810 }
 811
 812 /*
 813
 814  */
 815
 816 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 817                   struct snd_timer **rtimer)
 818 {
 819         struct snd_timer *timer;
 820         int err;
 821         static struct snd_device_ops ops = {
 822                 .dev_free = snd_timer_dev_free,
 823                 .dev_register = snd_timer_dev_register,
 824                 .dev_disconnect = snd_timer_dev_disconnect,
 825         };
 826
 827         if (snd_BUG_ON(!tid))
 828                 return -EINVAL;
 829         if (rtimer)
 830                 *rtimer = NULL;
 831         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 832         if (!timer)
 833                 return -ENOMEM;
 834         timer->tmr_class = tid->dev_class;
 835         timer->card = card;
 836         timer->tmr_device = tid->device;
 837         timer->tmr_subdevice = tid->subdevice;
 838         if (id)
 839                 strlcpy(timer->id, id, sizeof(timer->id));
 840         INIT_LIST_HEAD(&timer->device_list);
 841         INIT_LIST_HEAD(&timer->open_list_head);
 842         INIT_LIST_HEAD(&timer->active_list_head);
 843         INIT_LIST_HEAD(&timer->ack_list_head);
 844         INIT_LIST_HEAD(&timer->sack_list_head);
 845         spin_lock_init(&timer->lock);
 846         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 847                      (unsigned long)timer);
 848         if (card != NULL) {
 849                 timer->module = card->module;
 850                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 851                 if (err < 0) {
 852                         snd_timer_free(timer);
 853                         return err;
 854                 }
 855         }
 856         if (rtimer)
 857                 *rtimer = timer;
 858         return 0;
 859 }
 860
 861 static int snd_timer_free(struct snd_timer *timer)
 862 {
 863         if (!timer)
 864                 return 0;
 865
 866         mutex_lock(&register_mutex);
 867         if (! list_empty(&timer->open_list_head)) {
 868                 struct list_head *p, *n;
 869                 struct snd_timer_instance *ti;
 870                 pr_warn("ALSA: timer %p is busy?\n", timer);
 871                 list_for_each_safe(p, n, &timer->open_list_head) {
 872                         list_del_init(p);
 873                         ti = list_entry(p, struct snd_timer_instance, open_list);
 874                         ti->timer = NULL;
 875                 }
 876         }
 877         list_del(&timer->device_list);
 878         mutex_unlock(&register_mutex);
 879
 880         if (timer->private_free)
 881                 timer->private_free(timer);
 882         kfree(timer);
 883         return 0;
 884 }
 885
 886 static int snd_timer_dev_free(struct snd_device *device)
 887 {
 888         struct snd_timer *timer = device->device_data;
 889         return snd_timer_free(timer);
 890 }
 891
 892 static int snd_timer_dev_register(struct snd_device *dev)
 893 {
 894         struct snd_timer *timer = dev->device_data;
 895         struct snd_timer *timer1;
 896
 897         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 898                 return -ENXIO;
 899         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 900             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 901                 return -EINVAL;
 902
 903         mutex_lock(&register_mutex);
 904         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 905                 if (timer1->tmr_class > timer->tmr_class)
 906                         break;
 907                 if (timer1->tmr_class < timer->tmr_class)
 908                         continue;
 909                 if (timer1->card && timer->card) {
 910                         if (timer1->card->number > timer->card->number)
 911                                 break;
 912                         if (timer1->card->number < timer->card->number)
 913                                 continue;
 914                 }
 915                 if (timer1->tmr_device > timer->tmr_device)
 916                         break;
 917                 if (timer1->tmr_device < timer->tmr_device)
 918                         continue;
 919                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 920                         break;
 921                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 922                         continue;
 923                 /* conflicts.. */
 924                 mutex_unlock(&register_mutex);
 925                 return -EBUSY;
 926         }
 927         list_add_tail(&timer->device_list, &timer1->device_list);
 928         mutex_unlock(&register_mutex);
 929         return 0;
 930 }
 931
 932 /* just for reference in snd_timer_dev_disconnect() below */
 933 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
 934                                      int event, struct timespec *tstamp,
 935                                      unsigned long resolution);
 936
 937 static int snd_timer_dev_disconnect(struct snd_device *device)
 938 {
 939         struct snd_timer *timer = device->device_data;
 940         struct snd_timer_instance *ti;
 941
 942         mutex_lock(&register_mutex);
 943         list_del_init(&timer->device_list);
 944         /* wake up pending sleepers */
 945         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 946                 /* FIXME: better to have a ti.disconnect() op */
 947                 if (ti->ccallback == snd_timer_user_ccallback) {
 948                         struct snd_timer_user *tu = ti->callback_data;
 949
 950                         tu->disconnected = true;
 951                         wake_up(&tu->qchange_sleep);
 952                 }
 953         }
 954         mutex_unlock(&register_mutex);
 955         return 0;
 956 }
 957
 958 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 959 {
 960         unsigned long flags;
 961         unsigned long resolution = 0;
 962         struct snd_timer_instance *ti, *ts;
 963
 964         if (timer->card && timer->card->shutdown)
 965                 return;
 966         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 967                 return;
 968         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 969                        event > SNDRV_TIMER_EVENT_MRESUME))
 970                 return;
 971         spin_lock_irqsave(&timer->lock, flags);
 972         if (event == SNDRV_TIMER_EVENT_MSTART ||
 973             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 974             event == SNDRV_TIMER_EVENT_MRESUME) {
 975                 if (timer->hw.c_resolution)
 976                         resolution = timer->hw.c_resolution(timer);
 977                 else
 978                         resolution = timer->hw.resolution;
 979         }
 980         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 981                 if (ti->ccallback)
 982                         ti->ccallback(ti, event, tstamp, resolution);
 983                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 984                         if (ts->ccallback)
 985                                 ts->ccallback(ts, event, tstamp, resolution);
 986         }
 987         spin_unlock_irqrestore(&timer->lock, flags);
 988 }
 989
 990 /*
 991  * exported functions for global timers
 992  */
 993 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 994 {
 995         struct snd_timer_id tid;
 996
 997         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 998         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 999         tid.card = -1;
1000         tid.device = device;
1001         tid.subdevice = 0;
1002         return snd_timer_new(NULL, id, &tid, rtimer);
1003 }
1004
1005 int snd_timer_global_free(struct snd_timer *timer)
1006 {
1007         return snd_timer_free(timer);
1008 }
1009
1010 int snd_timer_global_register(struct snd_timer *timer)
1011 {
1012         struct snd_device dev;
1013
1014         memset(&dev, 0, sizeof(dev));
1015         dev.device_data = timer;
1016         return snd_timer_dev_register(&dev);
1017 }
1018
1019 /*
1020  *  System timer
1021  */
1022
1023 struct snd_timer_system_private {
1024         struct timer_list tlist;
1025         unsigned long last_expires;
1026         unsigned long last_jiffies;
1027         unsigned long correction;
1028 };
1029
1030 static void snd_timer_s_function(unsigned long data)
1031 {
1032         struct snd_timer *timer = (struct snd_timer *)data;
1033         struct snd_timer_system_private *priv = timer->private_data;
1034         unsigned long jiff = jiffies;
1035         if (time_after(jiff, priv->last_expires))
1036                 priv->correction += (long)jiff - (long)priv->last_expires;
1037         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1038 }
1039
1040 static int snd_timer_s_start(struct snd_timer * timer)
1041 {
1042         struct snd_timer_system_private *priv;
1043         unsigned long njiff;
1044
1045         priv = (struct snd_timer_system_private *) timer->private_data;
1046         njiff = (priv->last_jiffies = jiffies);
1047         if (priv->correction > timer->sticks - 1) {
1048                 priv->correction -= timer->sticks - 1;
1049                 njiff++;
1050         } else {
1051                 njiff += timer->sticks - priv->correction;
1052                 priv->correction = 0;
1053         }
1054         priv->last_expires = priv->tlist.expires = njiff;
1055         add_timer(&priv->tlist);
1056         return 0;
1057 }
1058
1059 static int snd_timer_s_stop(struct snd_timer * timer)
1060 {
1061         struct snd_timer_system_private *priv;
1062         unsigned long jiff;
1063
1064         priv = (struct snd_timer_system_private *) timer->private_data;
1065         del_timer(&priv->tlist);
1066         jiff = jiffies;
1067         if (time_before(jiff, priv->last_expires))
1068                 timer->sticks = priv->last_expires - jiff;
1069         else
1070                 timer->sticks = 1;
1071         priv->correction = 0;
1072         return 0;
1073 }
1074
1075 static struct snd_timer_hardware snd_timer_system =
1076 {
1077         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1078         .resolution =   1000000000L / HZ,
1079         .ticks =        10000000L,
1080         .start =        snd_timer_s_start,
1081         .stop =         snd_timer_s_stop
1082 };
1083
1084 static void snd_timer_free_system(struct snd_timer *timer)
1085 {
1086         kfree(timer->private_data);
1087 }
1088
1089 static int snd_timer_register_system(void)
1090 {
1091         struct snd_timer *timer;
1092         struct snd_timer_system_private *priv;
1093         int err;
1094
1095         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1096         if (err < 0)
1097                 return err;
1098         strcpy(timer->name, "system timer");
1099         timer->hw = snd_timer_system;
1100         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1101         if (priv == NULL) {
1102                 snd_timer_free(timer);
1103                 return -ENOMEM;
1104         }
1105         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1106         timer->private_data = priv;
1107         timer->private_free = snd_timer_free_system;
1108         return snd_timer_global_register(timer);
1109 }
1110
1111 #ifdef CONFIG_SND_PROC_FS
1112 /*
1113  *  Info interface
1114  */
1115
1116 static void snd_timer_proc_read(struct snd_info_entry *entry,
1117                                 struct snd_info_buffer *buffer)
1118 {
1119         struct snd_timer *timer;
1120         struct snd_timer_instance *ti;
1121
1122         mutex_lock(&register_mutex);
1123         list_for_each_entry(timer, &snd_timer_list, device_list) {
1124                 if (timer->card && timer->card->shutdown)
1125                         continue;
1126                 switch (timer->tmr_class) {
1127                 case SNDRV_TIMER_CLASS_GLOBAL:
1128                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1129                         break;
1130                 case SNDRV_TIMER_CLASS_CARD:
1131                         snd_iprintf(buffer, "C%i-%i: ",
1132                                     timer->card->number, timer->tmr_device);
1133                         break;
1134                 case SNDRV_TIMER_CLASS_PCM:
1135                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1136                                     timer->tmr_device, timer->tmr_subdevice);
1137                         break;
1138                 default:
1139                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1140                                     timer->card ? timer->card->number : -1,
1141                                     timer->tmr_device, timer->tmr_subdevice);
1142                 }
1143                 snd_iprintf(buffer, "%s :", timer->name);
1144                 if (timer->hw.resolution)
1145                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1146                                     timer->hw.resolution / 1000,
1147                                     timer->hw.resolution % 1000,
1148                                     timer->hw.ticks);
1149                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1150                         snd_iprintf(buffer, " SLAVE");
1151                 snd_iprintf(buffer, "\n");
1152                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1153                         snd_iprintf(buffer, "  Client %s : %s\n",
1154                                     ti->owner ? ti->owner : "unknown",
1155                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1156                                                  SNDRV_TIMER_IFLG_RUNNING)
1157                                     ? "running" : "stopped");
1158         }
1159         mutex_unlock(&register_mutex);
1160 }
1161
1162 static struct snd_info_entry *snd_timer_proc_entry;
1163
1164 static void __init snd_timer_proc_init(void)
1165 {
1166         struct snd_info_entry *entry;
1167
1168         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1169         if (entry != NULL) {
1170                 entry->c.text.read = snd_timer_proc_read;
1171                 if (snd_info_register(entry) < 0) {
1172                         snd_info_free_entry(entry);
1173                         entry = NULL;
1174                 }
1175         }
1176         snd_timer_proc_entry = entry;
1177 }
1178
1179 static void __exit snd_timer_proc_done(void)
1180 {
1181         snd_info_free_entry(snd_timer_proc_entry);
1182 }
1183 #else /* !CONFIG_SND_PROC_FS */
1184 #define snd_timer_proc_init()
1185 #define snd_timer_proc_done()
1186 #endif
1187
1188 /*
1189  *  USER SPACE interface
1190  */
1191
1192 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1193                                      unsigned long resolution,
1194                                      unsigned long ticks)
1195 {
1196         struct snd_timer_user *tu = timeri->callback_data;
1197         struct snd_timer_read *r;
1198         int prev;
1199
1200         spin_lock(&tu->qlock);
1201         if (tu->qused > 0) {
1202                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1203                 r = &tu->queue[prev];
1204                 if (r->resolution == resolution) {
1205                         r->ticks += ticks;
1206                         goto __wake;
1207                 }
1208         }
1209         if (tu->qused >= tu->queue_size) {
1210                 tu->overrun++;
1211         } else {
1212                 r = &tu->queue[tu->qtail++];
1213                 tu->qtail %= tu->queue_size;
1214                 r->resolution = resolution;
1215                 r->ticks = ticks;
1216                 tu->qused++;
1217         }
1218       __wake:
1219         spin_unlock(&tu->qlock);
1220         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1221         wake_up(&tu->qchange_sleep);
1222 }
1223
1224 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1225                                             struct snd_timer_tread *tread)
1226 {
1227         if (tu->qused >= tu->queue_size) {
1228                 tu->overrun++;
1229         } else {
1230                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1231                 tu->qtail %= tu->queue_size;
1232                 tu->qused++;
1233         }
1234 }
1235
1236 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1237                                      int event,
1238                                      struct timespec *tstamp,
1239                                      unsigned long resolution)
1240 {
1241         struct snd_timer_user *tu = timeri->callback_data;
1242         struct snd_timer_tread r1;
1243         unsigned long flags;
1244
1245         if (event >= SNDRV_TIMER_EVENT_START &&
1246             event <= SNDRV_TIMER_EVENT_PAUSE)
1247                 tu->tstamp = *tstamp;
1248         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1249                 return;
1250         r1.event = event;
1251         r1.tstamp = *tstamp;
1252         r1.val = resolution;
1253         spin_lock_irqsave(&tu->qlock, flags);
1254         snd_timer_user_append_to_tqueue(tu, &r1);
1255         spin_unlock_irqrestore(&tu->qlock, flags);
1256         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1257         wake_up(&tu->qchange_sleep);
1258 }
1259
1260 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1261                                       unsigned long resolution,
1262                                       unsigned long ticks)
1263 {
1264         struct snd_timer_user *tu = timeri->callback_data;
1265         struct snd_timer_tread *r, r1;
1266         struct timespec tstamp;
1267         int prev, append = 0;
1268
1269         memset(&tstamp, 0, sizeof(tstamp));
1270         spin_lock(&tu->qlock);
1271         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1272                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1273                 spin_unlock(&tu->qlock);
1274                 return;
1275         }
1276         if (tu->last_resolution != resolution || ticks > 0) {
1277                 if (timer_tstamp_monotonic)
1278                         ktime_get_ts(&tstamp);
1279                 else
1280                         getnstimeofday(&tstamp);
1281         }
1282         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1283             tu->last_resolution != resolution) {
1284                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1285                 r1.tstamp = tstamp;
1286                 r1.val = resolution;
1287                 snd_timer_user_append_to_tqueue(tu, &r1);
1288                 tu->last_resolution = resolution;
1289                 append++;
1290         }
1291         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1292                 goto __wake;
1293         if (ticks == 0)
1294                 goto __wake;
1295         if (tu->qused > 0) {
1296                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1297                 r = &tu->tqueue[prev];
1298                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1299                         r->tstamp = tstamp;
1300                         r->val += ticks;
1301                         append++;
1302                         goto __wake;
1303                 }
1304         }
1305         r1.event = SNDRV_TIMER_EVENT_TICK;
1306         r1.tstamp = tstamp;
1307         r1.val = ticks;
1308         snd_timer_user_append_to_tqueue(tu, &r1);
1309         append++;
1310       __wake:
1311         spin_unlock(&tu->qlock);
1312         if (append == 0)
1313                 return;
1314         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1315         wake_up(&tu->qchange_sleep);
1316 }
1317
1318 static int snd_timer_user_open(struct inode *inode, struct file *file)
1319 {
1320         struct snd_timer_user *tu;
1321         int err;
1322
1323         err = nonseekable_open(inode, file);
1324         if (err < 0)
1325                 return err;
1326
1327         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1328         if (tu == NULL)
1329                 return -ENOMEM;
1330         spin_lock_init(&tu->qlock);
1331         init_waitqueue_head(&tu->qchange_sleep);
1332         mutex_init(&tu->ioctl_lock);
1333         tu->ticks = 1;
1334         tu->queue_size = 128;
1335         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1336                             GFP_KERNEL);
1337         if (tu->queue == NULL) {
1338                 kfree(tu);
1339                 return -ENOMEM;
1340         }
1341         file->private_data = tu;
1342         return 0;
1343 }
1344
1345 static int snd_timer_user_release(struct inode *inode, struct file *file)
1346 {
1347         struct snd_timer_user *tu;
1348
1349         if (file->private_data) {
1350                 tu = file->private_data;
1351                 file->private_data = NULL;
1352                 mutex_lock(&tu->ioctl_lock);
1353                 if (tu->timeri)
1354                         snd_timer_close(tu->timeri);
1355                 mutex_unlock(&tu->ioctl_lock);
1356                 kfree(tu->queue);
1357                 kfree(tu->tqueue);
1358                 kfree(tu);
1359         }
1360         return 0;
1361 }
1362
1363 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1364 {
1365         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1366         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1367         id->card = -1;
1368         id->device = -1;
1369         id->subdevice = -1;
1370 }
1371
1372 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1373 {
1374         id->dev_class = timer->tmr_class;
1375         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1376         id->card = timer->card ? timer->card->number : -1;
1377         id->device = timer->tmr_device;
1378         id->subdevice = timer->tmr_subdevice;
1379 }
1380
1381 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1382 {
1383         struct snd_timer_id id;
1384         struct snd_timer *timer;
1385         struct list_head *p;
1386
1387         if (copy_from_user(&id, _tid, sizeof(id)))
1388                 return -EFAULT;
1389         mutex_lock(&register_mutex);
1390         if (id.dev_class < 0) {         /* first item */
1391                 if (list_empty(&snd_timer_list))
1392                         snd_timer_user_zero_id(&id);
1393                 else {
1394                         timer = list_entry(snd_timer_list.next,
1395                                            struct snd_timer, device_list);
1396                         snd_timer_user_copy_id(&id, timer);
1397                 }
1398         } else {
1399                 switch (id.dev_class) {
1400                 case SNDRV_TIMER_CLASS_GLOBAL:
1401                         id.device = id.device < 0 ? 0 : id.device + 1;
1402                         list_for_each(p, &snd_timer_list) {
1403                                 timer = list_entry(p, struct snd_timer, device_list);
1404                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1405                                         snd_timer_user_copy_id(&id, timer);
1406                                         break;
1407                                 }
1408                                 if (timer->tmr_device >= id.device) {
1409                                         snd_timer_user_copy_id(&id, timer);
1410                                         break;
1411                                 }
1412                         }
1413                         if (p == &snd_timer_list)
1414                                 snd_timer_user_zero_id(&id);
1415                         break;
1416                 case SNDRV_TIMER_CLASS_CARD:
1417                 case SNDRV_TIMER_CLASS_PCM:
1418                         if (id.card < 0) {
1419                                 id.card = 0;
1420                         } else {
1421                                 if (id.card < 0) {
1422                                         id.card = 0;
1423                                 } else {
1424                                         if (id.device < 0) {
1425                                                 id.device = 0;
1426                                         } else {
1427                                                 if (id.subdevice < 0) {
1428                                                         id.subdevice = 0;
1429                                                 } else {
1430                                                         id.subdevice++;
1431                                                 }
1432                                         }
1433                                 }
1434                         }
1435                         list_for_each(p, &snd_timer_list) {
1436                                 timer = list_entry(p, struct snd_timer, device_list);
1437                                 if (timer->tmr_class > id.dev_class) {
1438                                         snd_timer_user_copy_id(&id, timer);
1439                                         break;
1440                                 }
1441                                 if (timer->tmr_class < id.dev_class)
1442                                         continue;
1443                                 if (timer->card->number > id.card) {
1444                                         snd_timer_user_copy_id(&id, timer);
1445                                         break;
1446                                 }
1447                                 if (timer->card->number < id.card)
1448                                         continue;
1449                                 if (timer->tmr_device > id.device) {
1450                                         snd_timer_user_copy_id(&id, timer);
1451                                         break;
1452                                 }
1453                                 if (timer->tmr_device < id.device)
1454                                         continue;
1455                                 if (timer->tmr_subdevice > id.subdevice) {
1456                                         snd_timer_user_copy_id(&id, timer);
1457                                         break;
1458                                 }
1459                                 if (timer->tmr_subdevice < id.subdevice)
1460                                         continue;
1461                                 snd_timer_user_copy_id(&id, timer);
1462                                 break;
1463                         }
1464                         if (p == &snd_timer_list)
1465                                 snd_timer_user_zero_id(&id);
1466                         break;
1467                 default:
1468                         snd_timer_user_zero_id(&id);
1469                 }
1470         }
1471         mutex_unlock(&register_mutex);
1472         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1473                 return -EFAULT;
1474         return 0;
1475 }
1476
1477 static int snd_timer_user_ginfo(struct file *file,
1478                                 struct snd_timer_ginfo __user *_ginfo)
1479 {
1480         struct snd_timer_ginfo *ginfo;
1481         struct snd_timer_id tid;
1482         struct snd_timer *t;
1483         struct list_head *p;
1484         int err = 0;
1485
1486         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1487         if (IS_ERR(ginfo))
1488                 return PTR_ERR(ginfo);
1489
1490         tid = ginfo->tid;
1491         memset(ginfo, 0, sizeof(*ginfo));
1492         ginfo->tid = tid;
1493         mutex_lock(&register_mutex);
1494         t = snd_timer_find(&tid);
1495         if (t != NULL) {
1496                 ginfo->card = t->card ? t->card->number : -1;
1497                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1498                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1499                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1500                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1501                 ginfo->resolution = t->hw.resolution;
1502                 if (t->hw.resolution_min > 0) {
1503                         ginfo->resolution_min = t->hw.resolution_min;
1504                         ginfo->resolution_max = t->hw.resolution_max;
1505                 }
1506                 list_for_each(p, &t->open_list_head) {
1507                         ginfo->clients++;
1508                 }
1509         } else {
1510                 err = -ENODEV;
1511         }
1512         mutex_unlock(&register_mutex);
1513         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1514                 err = -EFAULT;
1515         kfree(ginfo);
1516         return err;
1517 }
1518
1519 static int snd_timer_user_gparams(struct file *file,
1520                                   struct snd_timer_gparams __user *_gparams)
1521 {
1522         struct snd_timer_gparams gparams;
1523         struct snd_timer *t;
1524         int err;
1525
1526         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1527                 return -EFAULT;
1528         mutex_lock(&register_mutex);
1529         t = snd_timer_find(&gparams.tid);
1530         if (!t) {
1531                 err = -ENODEV;
1532                 goto _error;
1533         }
1534         if (!list_empty(&t->open_list_head)) {
1535                 err = -EBUSY;
1536                 goto _error;
1537         }
1538         if (!t->hw.set_period) {
1539                 err = -ENOSYS;
1540                 goto _error;
1541         }
1542         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1543 _error:
1544         mutex_unlock(&register_mutex);
1545         return err;
1546 }
1547
1548 static int snd_timer_user_gstatus(struct file *file,
1549                                   struct snd_timer_gstatus __user *_gstatus)
1550 {
1551         struct snd_timer_gstatus gstatus;
1552         struct snd_timer_id tid;
1553         struct snd_timer *t;
1554         int err = 0;
1555
1556         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1557                 return -EFAULT;
1558         tid = gstatus.tid;
1559         memset(&gstatus, 0, sizeof(gstatus));
1560         gstatus.tid = tid;
1561         mutex_lock(&register_mutex);
1562         t = snd_timer_find(&tid);
1563         if (t != NULL) {
1564                 if (t->hw.c_resolution)
1565                         gstatus.resolution = t->hw.c_resolution(t);
1566                 else
1567                         gstatus.resolution = t->hw.resolution;
1568                 if (t->hw.precise_resolution) {
1569                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1570                                                  &gstatus.resolution_den);
1571                 } else {
1572                         gstatus.resolution_num = gstatus.resolution;
1573                         gstatus.resolution_den = 1000000000uL;
1574                 }
1575         } else {
1576                 err = -ENODEV;
1577         }
1578         mutex_unlock(&register_mutex);
1579         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1580                 err = -EFAULT;
1581         return err;
1582 }
1583
1584 static int snd_timer_user_tselect(struct file *file,
1585                                   struct snd_timer_select __user *_tselect)
1586 {
1587         struct snd_timer_user *tu;
1588         struct snd_timer_select tselect;
1589         char str[32];
1590         int err = 0;
1591
1592         tu = file->private_data;
1593         if (tu->timeri) {
1594                 snd_timer_close(tu->timeri);
1595                 tu->timeri = NULL;
1596         }
1597         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1598                 err = -EFAULT;
1599                 goto __err;
1600         }
1601         sprintf(str, "application %i", current->pid);
1602         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1603                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1604         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1605         if (err < 0)
1606                 goto __err;
1607
1608         kfree(tu->queue);
1609         tu->queue = NULL;
1610         kfree(tu->tqueue);
1611         tu->tqueue = NULL;
1612         if (tu->tread) {
1613                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1614                                      GFP_KERNEL);
1615                 if (tu->tqueue == NULL)
1616                         err = -ENOMEM;
1617         } else {
1618                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1619                                     GFP_KERNEL);
1620                 if (tu->queue == NULL)
1621                         err = -ENOMEM;
1622         }
1623
1624         if (err < 0) {
1625                 snd_timer_close(tu->timeri);
1626                 tu->timeri = NULL;
1627         } else {
1628                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1629                 tu->timeri->callback = tu->tread
1630                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1631                 tu->timeri->ccallback = snd_timer_user_ccallback;
1632                 tu->timeri->callback_data = (void *)tu;
1633         }
1634
1635       __err:
1636         return err;
1637 }
1638
1639 static int snd_timer_user_info(struct file *file,
1640                                struct snd_timer_info __user *_info)
1641 {
1642         struct snd_timer_user *tu;
1643         struct snd_timer_info *info;
1644         struct snd_timer *t;
1645         int err = 0;
1646
1647         tu = file->private_data;
1648         if (!tu->timeri)
1649                 return -EBADFD;
1650         t = tu->timeri->timer;
1651         if (!t)
1652                 return -EBADFD;
1653
1654         info = kzalloc(sizeof(*info), GFP_KERNEL);
1655         if (! info)
1656                 return -ENOMEM;
1657         info->card = t->card ? t->card->number : -1;
1658         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1659                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1660         strlcpy(info->id, t->id, sizeof(info->id));
1661         strlcpy(info->name, t->name, sizeof(info->name));
1662         info->resolution = t->hw.resolution;
1663         if (copy_to_user(_info, info, sizeof(*_info)))
1664                 err = -EFAULT;
1665         kfree(info);
1666         return err;
1667 }
1668
1669 static int snd_timer_user_params(struct file *file,
1670                                  struct snd_timer_params __user *_params)
1671 {
1672         struct snd_timer_user *tu;
1673         struct snd_timer_params params;
1674         struct snd_timer *t;
1675         struct snd_timer_read *tr;
1676         struct snd_timer_tread *ttr;
1677         int err;
1678
1679         tu = file->private_data;
1680         if (!tu->timeri)
1681                 return -EBADFD;
1682         t = tu->timeri->timer;
1683         if (!t)
1684                 return -EBADFD;
1685         if (copy_from_user(&params, _params, sizeof(params)))
1686                 return -EFAULT;
1687         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1688                 err = -EINVAL;
1689                 goto _end;
1690         }
1691         if (params.queue_size > 0 &&
1692             (params.queue_size < 32 || params.queue_size > 1024)) {
1693                 err = -EINVAL;
1694                 goto _end;
1695         }
1696         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1697                               (1<<SNDRV_TIMER_EVENT_TICK)|
1698                               (1<<SNDRV_TIMER_EVENT_START)|
1699                               (1<<SNDRV_TIMER_EVENT_STOP)|
1700                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1701                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1702                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1703                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1704                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1705                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1706                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1707                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1708                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1709                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1710                 err = -EINVAL;
1711                 goto _end;
1712         }
1713         snd_timer_stop(tu->timeri);
1714         spin_lock_irq(&t->lock);
1715         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1716                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1717                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1718         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1719                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1720         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1721                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1722         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1723                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1724         spin_unlock_irq(&t->lock);
1725         if (params.queue_size > 0 &&
1726             (unsigned int)tu->queue_size != params.queue_size) {
1727                 if (tu->tread) {
1728                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1729                                       GFP_KERNEL);
1730                         if (ttr) {
1731                                 kfree(tu->tqueue);
1732                                 tu->queue_size = params.queue_size;
1733                                 tu->tqueue = ttr;
1734                         }
1735                 } else {
1736                         tr = kmalloc(params.queue_size * sizeof(*tr),
1737                                      GFP_KERNEL);
1738                         if (tr) {
1739                                 kfree(tu->queue);
1740                                 tu->queue_size = params.queue_size;
1741                                 tu->queue = tr;
1742                         }
1743                 }
1744         }
1745         tu->qhead = tu->qtail = tu->qused = 0;
1746         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1747                 if (tu->tread) {
1748                         struct snd_timer_tread tread;
1749                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1750                         tread.tstamp.tv_sec = 0;
1751                         tread.tstamp.tv_nsec = 0;
1752                         tread.val = 0;
1753                         snd_timer_user_append_to_tqueue(tu, &tread);
1754                 } else {
1755                         struct snd_timer_read *r = &tu->queue[0];
1756                         r->resolution = 0;
1757                         r->ticks = 0;
1758                         tu->qused++;
1759                         tu->qtail++;
1760                 }
1761         }
1762         tu->filter = params.filter;
1763         tu->ticks = params.ticks;
1764         err = 0;
1765  _end:
1766         if (copy_to_user(_params, &params, sizeof(params)))
1767                 return -EFAULT;
1768         return err;
1769 }
1770
1771 static int snd_timer_user_status(struct file *file,
1772                                  struct snd_timer_status __user *_status)
1773 {
1774         struct snd_timer_user *tu;
1775         struct snd_timer_status status;
1776
1777         tu = file->private_data;
1778         if (!tu->timeri)
1779                 return -EBADFD;
1780         memset(&status, 0, sizeof(status));
1781         status.tstamp = tu->tstamp;
1782         status.resolution = snd_timer_resolution(tu->timeri);
1783         status.lost = tu->timeri->lost;
1784         status.overrun = tu->overrun;
1785         spin_lock_irq(&tu->qlock);
1786         status.queue = tu->qused;
1787         spin_unlock_irq(&tu->qlock);
1788         if (copy_to_user(_status, &status, sizeof(status)))
1789                 return -EFAULT;
1790         return 0;
1791 }
1792
1793 static int snd_timer_user_start(struct file *file)
1794 {
1795         int err;
1796         struct snd_timer_user *tu;
1797
1798         tu = file->private_data;
1799         if (!tu->timeri)
1800                 return -EBADFD;
1801         snd_timer_stop(tu->timeri);
1802         tu->timeri->lost = 0;
1803         tu->last_resolution = 0;
1804         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1805 }
1806
1807 static int snd_timer_user_stop(struct file *file)
1808 {
1809         int err;
1810         struct snd_timer_user *tu;
1811
1812         tu = file->private_data;
1813         if (!tu->timeri)
1814                 return -EBADFD;
1815         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1816 }
1817
1818 static int snd_timer_user_continue(struct file *file)
1819 {
1820         int err;
1821         struct snd_timer_user *tu;
1822
1823         tu = file->private_data;
1824         if (!tu->timeri)
1825                 return -EBADFD;
1826         tu->timeri->lost = 0;
1827         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1828 }
1829
1830 static int snd_timer_user_pause(struct file *file)
1831 {
1832         int err;
1833         struct snd_timer_user *tu;
1834
1835         tu = file->private_data;
1836         if (!tu->timeri)
1837                 return -EBADFD;
1838         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1839 }
1840
1841 enum {
1842         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1843         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1844         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1845         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1846 };
1847
1848 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1849                                  unsigned long arg)
1850 {
1851         struct snd_timer_user *tu;
1852         void __user *argp = (void __user *)arg;
1853         int __user *p = argp;
1854
1855         tu = file->private_data;
1856         switch (cmd) {
1857         case SNDRV_TIMER_IOCTL_PVERSION:
1858                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1859         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1860                 return snd_timer_user_next_device(argp);
1861         case SNDRV_TIMER_IOCTL_TREAD:
1862         {
1863                 int xarg;
1864
1865                 if (tu->timeri) /* too late */
1866                         return -EBUSY;
1867                 if (get_user(xarg, p))
1868                         return -EFAULT;
1869                 tu->tread = xarg ? 1 : 0;
1870                 return 0;
1871         }
1872         case SNDRV_TIMER_IOCTL_GINFO:
1873                 return snd_timer_user_ginfo(file, argp);
1874         case SNDRV_TIMER_IOCTL_GPARAMS:
1875                 return snd_timer_user_gparams(file, argp);
1876         case SNDRV_TIMER_IOCTL_GSTATUS:
1877                 return snd_timer_user_gstatus(file, argp);
1878         case SNDRV_TIMER_IOCTL_SELECT:
1879                 return snd_timer_user_tselect(file, argp);
1880         case SNDRV_TIMER_IOCTL_INFO:
1881                 return snd_timer_user_info(file, argp);
1882         case SNDRV_TIMER_IOCTL_PARAMS:
1883                 return snd_timer_user_params(file, argp);
1884         case SNDRV_TIMER_IOCTL_STATUS:
1885                 return snd_timer_user_status(file, argp);
1886         case SNDRV_TIMER_IOCTL_START:
1887         case SNDRV_TIMER_IOCTL_START_OLD:
1888                 return snd_timer_user_start(file);
1889         case SNDRV_TIMER_IOCTL_STOP:
1890         case SNDRV_TIMER_IOCTL_STOP_OLD:
1891                 return snd_timer_user_stop(file);
1892         case SNDRV_TIMER_IOCTL_CONTINUE:
1893         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1894                 return snd_timer_user_continue(file);
1895         case SNDRV_TIMER_IOCTL_PAUSE:
1896         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1897                 return snd_timer_user_pause(file);
1898         }
1899         return -ENOTTY;
1900 }
1901
1902 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1903                                  unsigned long arg)
1904 {
1905         struct snd_timer_user *tu = file->private_data;
1906         long ret;
1907
1908         mutex_lock(&tu->ioctl_lock);
1909         ret = __snd_timer_user_ioctl(file, cmd, arg);
1910         mutex_unlock(&tu->ioctl_lock);
1911         return ret;
1912 }
1913
1914 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1915 {
1916         struct snd_timer_user *tu;
1917
1918         tu = file->private_data;
1919         return fasync_helper(fd, file, on, &tu->fasync);
1920 }
1921
1922 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1923                                    size_t count, loff_t *offset)
1924 {
1925         struct snd_timer_user *tu;
1926         long result = 0, unit;
1927         int qhead;
1928         int err = 0;
1929
1930         tu = file->private_data;
1931         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1932         spin_lock_irq(&tu->qlock);
1933         while ((long)count - result >= unit) {
1934                 while (!tu->qused) {
1935                         wait_queue_t wait;
1936
1937                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1938                                 err = -EAGAIN;
1939                                 goto _error;
1940                         }
1941
1942                         set_current_state(TASK_INTERRUPTIBLE);
1943                         init_waitqueue_entry(&wait, current);
1944                         add_wait_queue(&tu->qchange_sleep, &wait);
1945
1946                         spin_unlock_irq(&tu->qlock);
1947                         schedule();
1948                         spin_lock_irq(&tu->qlock);
1949
1950                         remove_wait_queue(&tu->qchange_sleep, &wait);
1951
1952                         if (tu->disconnected) {
1953                                 err = -ENODEV;
1954                                 goto _error;
1955                         }
1956                         if (signal_pending(current)) {
1957                                 err = -ERESTARTSYS;
1958                                 goto _error;
1959                         }
1960                 }
1961
1962                 qhead = tu->qhead++;
1963                 tu->qhead %= tu->queue_size;
1964                 spin_unlock_irq(&tu->qlock);
1965
1966                 if (tu->tread) {
1967                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1968                                          sizeof(struct snd_timer_tread)))
1969                                 err = -EFAULT;
1970                 } else {
1971                         if (copy_to_user(buffer, &tu->queue[qhead],
1972                                          sizeof(struct snd_timer_read)))
1973                                 err = -EFAULT;
1974                 }
1975
1976                 spin_lock_irq(&tu->qlock);
1977                 tu->qused--;
1978                 if (err < 0)
1979                         goto _error;
1980                 result += unit;
1981                 buffer += unit;
1982         }
1983  _error:
1984         spin_unlock_irq(&tu->qlock);
1985         return result > 0 ? result : err;
1986 }
1987
1988 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1989 {
1990         unsigned int mask;
1991         struct snd_timer_user *tu;
1992
1993         tu = file->private_data;
1994
1995         poll_wait(file, &tu->qchange_sleep, wait);
1996
1997         mask = 0;
1998         if (tu->qused)
1999                 mask |= POLLIN | POLLRDNORM;
2000         if (tu->disconnected)
2001                 mask |= POLLERR;
2002
2003         return mask;
2004 }
2005
2006 #ifdef CONFIG_COMPAT
2007 #include "timer_compat.c"
2008 #else
2009 #define snd_timer_user_ioctl_compat     NULL
2010 #endif
2011
2012 static const struct file_operations snd_timer_f_ops =
2013 {
2014         .owner =        THIS_MODULE,
2015         .read =         snd_timer_user_read,
2016         .open =         snd_timer_user_open,
2017         .release =      snd_timer_user_release,
2018         .llseek =       no_llseek,
2019         .poll =         snd_timer_user_poll,
2020         .unlocked_ioctl =       snd_timer_user_ioctl,
2021         .compat_ioctl = snd_timer_user_ioctl_compat,
2022         .fasync =       snd_timer_user_fasync,
2023 };
2024
2025 /* unregister the system timer */
2026 static void snd_timer_free_all(void)
2027 {
2028         struct snd_timer *timer, *n;
2029
2030         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2031                 snd_timer_free(timer);
2032 }
2033
2034 static struct device timer_dev;
2035
2036 /*
2037  *  ENTRY functions
2038  */
2039
2040 static int __init alsa_timer_init(void)
2041 {
2042         int err;
2043
2044         snd_device_initialize(&timer_dev, NULL);
2045         dev_set_name(&timer_dev, "timer");
2046
2047 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2048         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2049                               "system timer");
2050 #endif
2051
2052         err = snd_timer_register_system();
2053         if (err < 0) {
2054                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2055                 put_device(&timer_dev);
2056                 return err;
2057         }
2058
2059         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2060                                   &snd_timer_f_ops, NULL, &timer_dev);
2061         if (err < 0) {
2062                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2063                 snd_timer_free_all();
2064                 put_device(&timer_dev);
2065                 return err;
2066         }
2067
2068         snd_timer_proc_init();
2069         return 0;
2070 }
2071
2072 static void __exit alsa_timer_exit(void)
2073 {
2074         snd_unregister_device(&timer_dev);
2075         snd_timer_free_all();
2076         put_device(&timer_dev);
2077         snd_timer_proc_done();
2078 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2079         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2080 #endif
2081 }
2082
2083 module_init(alsa_timer_init)
2084 module_exit(alsa_timer_exit)
2085
2086 EXPORT_SYMBOL(snd_timer_open);
2087 EXPORT_SYMBOL(snd_timer_close);
2088 EXPORT_SYMBOL(snd_timer_resolution);
2089 EXPORT_SYMBOL(snd_timer_start);
2090 EXPORT_SYMBOL(snd_timer_stop);
2091 EXPORT_SYMBOL(snd_timer_continue);
2092 EXPORT_SYMBOL(snd_timer_pause);
2093 EXPORT_SYMBOL(snd_timer_new);
2094 EXPORT_SYMBOL(snd_timer_notify);
2095 EXPORT_SYMBOL(snd_timer_global_new);
2096 EXPORT_SYMBOL(snd_timer_global_free);
2097 EXPORT_SYMBOL(snd_timer_global_register);
2098 EXPORT_SYMBOL(snd_timer_interrupt);