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 = njiff;
1055         mod_timer(&priv->tlist, njiff);
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         memset(&r1, 0, sizeof(r1));
1251         r1.event = event;
1252         r1.tstamp = *tstamp;
1253         r1.val = resolution;
1254         spin_lock_irqsave(&tu->qlock, flags);
1255         snd_timer_user_append_to_tqueue(tu, &r1);
1256         spin_unlock_irqrestore(&tu->qlock, flags);
1257         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1258         wake_up(&tu->qchange_sleep);
1259 }
1260
1261 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1262                                       unsigned long resolution,
1263                                       unsigned long ticks)
1264 {
1265         struct snd_timer_user *tu = timeri->callback_data;
1266         struct snd_timer_tread *r, r1;
1267         struct timespec tstamp;
1268         int prev, append = 0;
1269
1270         memset(&tstamp, 0, sizeof(tstamp));
1271         spin_lock(&tu->qlock);
1272         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1273                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1274                 spin_unlock(&tu->qlock);
1275                 return;
1276         }
1277         if (tu->last_resolution != resolution || ticks > 0) {
1278                 if (timer_tstamp_monotonic)
1279                         ktime_get_ts(&tstamp);
1280                 else
1281                         getnstimeofday(&tstamp);
1282         }
1283         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1284             tu->last_resolution != resolution) {
1285                 memset(&r1, 0, sizeof(r1));
1286                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1287                 r1.tstamp = tstamp;
1288                 r1.val = resolution;
1289                 snd_timer_user_append_to_tqueue(tu, &r1);
1290                 tu->last_resolution = resolution;
1291                 append++;
1292         }
1293         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1294                 goto __wake;
1295         if (ticks == 0)
1296                 goto __wake;
1297         if (tu->qused > 0) {
1298                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1299                 r = &tu->tqueue[prev];
1300                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1301                         r->tstamp = tstamp;
1302                         r->val += ticks;
1303                         append++;
1304                         goto __wake;
1305                 }
1306         }
1307         r1.event = SNDRV_TIMER_EVENT_TICK;
1308         r1.tstamp = tstamp;
1309         r1.val = ticks;
1310         snd_timer_user_append_to_tqueue(tu, &r1);
1311         append++;
1312       __wake:
1313         spin_unlock(&tu->qlock);
1314         if (append == 0)
1315                 return;
1316         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1317         wake_up(&tu->qchange_sleep);
1318 }
1319
1320 static int snd_timer_user_open(struct inode *inode, struct file *file)
1321 {
1322         struct snd_timer_user *tu;
1323         int err;
1324
1325         err = nonseekable_open(inode, file);
1326         if (err < 0)
1327                 return err;
1328
1329         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1330         if (tu == NULL)
1331                 return -ENOMEM;
1332         spin_lock_init(&tu->qlock);
1333         init_waitqueue_head(&tu->qchange_sleep);
1334         mutex_init(&tu->ioctl_lock);
1335         tu->ticks = 1;
1336         tu->queue_size = 128;
1337         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1338                             GFP_KERNEL);
1339         if (tu->queue == NULL) {
1340                 kfree(tu);
1341                 return -ENOMEM;
1342         }
1343         file->private_data = tu;
1344         return 0;
1345 }
1346
1347 static int snd_timer_user_release(struct inode *inode, struct file *file)
1348 {
1349         struct snd_timer_user *tu;
1350
1351         if (file->private_data) {
1352                 tu = file->private_data;
1353                 file->private_data = NULL;
1354                 mutex_lock(&tu->ioctl_lock);
1355                 if (tu->timeri)
1356                         snd_timer_close(tu->timeri);
1357                 mutex_unlock(&tu->ioctl_lock);
1358                 kfree(tu->queue);
1359                 kfree(tu->tqueue);
1360                 kfree(tu);
1361         }
1362         return 0;
1363 }
1364
1365 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1366 {
1367         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1368         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1369         id->card = -1;
1370         id->device = -1;
1371         id->subdevice = -1;
1372 }
1373
1374 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1375 {
1376         id->dev_class = timer->tmr_class;
1377         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1378         id->card = timer->card ? timer->card->number : -1;
1379         id->device = timer->tmr_device;
1380         id->subdevice = timer->tmr_subdevice;
1381 }
1382
1383 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1384 {
1385         struct snd_timer_id id;
1386         struct snd_timer *timer;
1387         struct list_head *p;
1388
1389         if (copy_from_user(&id, _tid, sizeof(id)))
1390                 return -EFAULT;
1391         mutex_lock(&register_mutex);
1392         if (id.dev_class < 0) {         /* first item */
1393                 if (list_empty(&snd_timer_list))
1394                         snd_timer_user_zero_id(&id);
1395                 else {
1396                         timer = list_entry(snd_timer_list.next,
1397                                            struct snd_timer, device_list);
1398                         snd_timer_user_copy_id(&id, timer);
1399                 }
1400         } else {
1401                 switch (id.dev_class) {
1402                 case SNDRV_TIMER_CLASS_GLOBAL:
1403                         id.device = id.device < 0 ? 0 : id.device + 1;
1404                         list_for_each(p, &snd_timer_list) {
1405                                 timer = list_entry(p, struct snd_timer, device_list);
1406                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1407                                         snd_timer_user_copy_id(&id, timer);
1408                                         break;
1409                                 }
1410                                 if (timer->tmr_device >= id.device) {
1411                                         snd_timer_user_copy_id(&id, timer);
1412                                         break;
1413                                 }
1414                         }
1415                         if (p == &snd_timer_list)
1416                                 snd_timer_user_zero_id(&id);
1417                         break;
1418                 case SNDRV_TIMER_CLASS_CARD:
1419                 case SNDRV_TIMER_CLASS_PCM:
1420                         if (id.card < 0) {
1421                                 id.card = 0;
1422                         } else {
1423                                 if (id.card < 0) {
1424                                         id.card = 0;
1425                                 } else {
1426                                         if (id.device < 0) {
1427                                                 id.device = 0;
1428                                         } else {
1429                                                 if (id.subdevice < 0) {
1430                                                         id.subdevice = 0;
1431                                                 } else {
1432                                                         id.subdevice++;
1433                                                 }
1434                                         }
1435                                 }
1436                         }
1437                         list_for_each(p, &snd_timer_list) {
1438                                 timer = list_entry(p, struct snd_timer, device_list);
1439                                 if (timer->tmr_class > id.dev_class) {
1440                                         snd_timer_user_copy_id(&id, timer);
1441                                         break;
1442                                 }
1443                                 if (timer->tmr_class < id.dev_class)
1444                                         continue;
1445                                 if (timer->card->number > id.card) {
1446                                         snd_timer_user_copy_id(&id, timer);
1447                                         break;
1448                                 }
1449                                 if (timer->card->number < id.card)
1450                                         continue;
1451                                 if (timer->tmr_device > id.device) {
1452                                         snd_timer_user_copy_id(&id, timer);
1453                                         break;
1454                                 }
1455                                 if (timer->tmr_device < id.device)
1456                                         continue;
1457                                 if (timer->tmr_subdevice > id.subdevice) {
1458                                         snd_timer_user_copy_id(&id, timer);
1459                                         break;
1460                                 }
1461                                 if (timer->tmr_subdevice < id.subdevice)
1462                                         continue;
1463                                 snd_timer_user_copy_id(&id, timer);
1464                                 break;
1465                         }
1466                         if (p == &snd_timer_list)
1467                                 snd_timer_user_zero_id(&id);
1468                         break;
1469                 default:
1470                         snd_timer_user_zero_id(&id);
1471                 }
1472         }
1473         mutex_unlock(&register_mutex);
1474         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1475                 return -EFAULT;
1476         return 0;
1477 }
1478
1479 static int snd_timer_user_ginfo(struct file *file,
1480                                 struct snd_timer_ginfo __user *_ginfo)
1481 {
1482         struct snd_timer_ginfo *ginfo;
1483         struct snd_timer_id tid;
1484         struct snd_timer *t;
1485         struct list_head *p;
1486         int err = 0;
1487
1488         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1489         if (IS_ERR(ginfo))
1490                 return PTR_ERR(ginfo);
1491
1492         tid = ginfo->tid;
1493         memset(ginfo, 0, sizeof(*ginfo));
1494         ginfo->tid = tid;
1495         mutex_lock(&register_mutex);
1496         t = snd_timer_find(&tid);
1497         if (t != NULL) {
1498                 ginfo->card = t->card ? t->card->number : -1;
1499                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1500                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1501                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1502                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1503                 ginfo->resolution = t->hw.resolution;
1504                 if (t->hw.resolution_min > 0) {
1505                         ginfo->resolution_min = t->hw.resolution_min;
1506                         ginfo->resolution_max = t->hw.resolution_max;
1507                 }
1508                 list_for_each(p, &t->open_list_head) {
1509                         ginfo->clients++;
1510                 }
1511         } else {
1512                 err = -ENODEV;
1513         }
1514         mutex_unlock(&register_mutex);
1515         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1516                 err = -EFAULT;
1517         kfree(ginfo);
1518         return err;
1519 }
1520
1521 static int snd_timer_user_gparams(struct file *file,
1522                                   struct snd_timer_gparams __user *_gparams)
1523 {
1524         struct snd_timer_gparams gparams;
1525         struct snd_timer *t;
1526         int err;
1527
1528         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1529                 return -EFAULT;
1530         mutex_lock(&register_mutex);
1531         t = snd_timer_find(&gparams.tid);
1532         if (!t) {
1533                 err = -ENODEV;
1534                 goto _error;
1535         }
1536         if (!list_empty(&t->open_list_head)) {
1537                 err = -EBUSY;
1538                 goto _error;
1539         }
1540         if (!t->hw.set_period) {
1541                 err = -ENOSYS;
1542                 goto _error;
1543         }
1544         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1545 _error:
1546         mutex_unlock(&register_mutex);
1547         return err;
1548 }
1549
1550 static int snd_timer_user_gstatus(struct file *file,
1551                                   struct snd_timer_gstatus __user *_gstatus)
1552 {
1553         struct snd_timer_gstatus gstatus;
1554         struct snd_timer_id tid;
1555         struct snd_timer *t;
1556         int err = 0;
1557
1558         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1559                 return -EFAULT;
1560         tid = gstatus.tid;
1561         memset(&gstatus, 0, sizeof(gstatus));
1562         gstatus.tid = tid;
1563         mutex_lock(&register_mutex);
1564         t = snd_timer_find(&tid);
1565         if (t != NULL) {
1566                 if (t->hw.c_resolution)
1567                         gstatus.resolution = t->hw.c_resolution(t);
1568                 else
1569                         gstatus.resolution = t->hw.resolution;
1570                 if (t->hw.precise_resolution) {
1571                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1572                                                  &gstatus.resolution_den);
1573                 } else {
1574                         gstatus.resolution_num = gstatus.resolution;
1575                         gstatus.resolution_den = 1000000000uL;
1576                 }
1577         } else {
1578                 err = -ENODEV;
1579         }
1580         mutex_unlock(&register_mutex);
1581         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1582                 err = -EFAULT;
1583         return err;
1584 }
1585
1586 static int snd_timer_user_tselect(struct file *file,
1587                                   struct snd_timer_select __user *_tselect)
1588 {
1589         struct snd_timer_user *tu;
1590         struct snd_timer_select tselect;
1591         char str[32];
1592         int err = 0;
1593
1594         tu = file->private_data;
1595         if (tu->timeri) {
1596                 snd_timer_close(tu->timeri);
1597                 tu->timeri = NULL;
1598         }
1599         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1600                 err = -EFAULT;
1601                 goto __err;
1602         }
1603         sprintf(str, "application %i", current->pid);
1604         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1605                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1606         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1607         if (err < 0)
1608                 goto __err;
1609
1610         kfree(tu->queue);
1611         tu->queue = NULL;
1612         kfree(tu->tqueue);
1613         tu->tqueue = NULL;
1614         if (tu->tread) {
1615                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1616                                      GFP_KERNEL);
1617                 if (tu->tqueue == NULL)
1618                         err = -ENOMEM;
1619         } else {
1620                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1621                                     GFP_KERNEL);
1622                 if (tu->queue == NULL)
1623                         err = -ENOMEM;
1624         }
1625
1626         if (err < 0) {
1627                 snd_timer_close(tu->timeri);
1628                 tu->timeri = NULL;
1629         } else {
1630                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1631                 tu->timeri->callback = tu->tread
1632                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1633                 tu->timeri->ccallback = snd_timer_user_ccallback;
1634                 tu->timeri->callback_data = (void *)tu;
1635         }
1636
1637       __err:
1638         return err;
1639 }
1640
1641 static int snd_timer_user_info(struct file *file,
1642                                struct snd_timer_info __user *_info)
1643 {
1644         struct snd_timer_user *tu;
1645         struct snd_timer_info *info;
1646         struct snd_timer *t;
1647         int err = 0;
1648
1649         tu = file->private_data;
1650         if (!tu->timeri)
1651                 return -EBADFD;
1652         t = tu->timeri->timer;
1653         if (!t)
1654                 return -EBADFD;
1655
1656         info = kzalloc(sizeof(*info), GFP_KERNEL);
1657         if (! info)
1658                 return -ENOMEM;
1659         info->card = t->card ? t->card->number : -1;
1660         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1661                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1662         strlcpy(info->id, t->id, sizeof(info->id));
1663         strlcpy(info->name, t->name, sizeof(info->name));
1664         info->resolution = t->hw.resolution;
1665         if (copy_to_user(_info, info, sizeof(*_info)))
1666                 err = -EFAULT;
1667         kfree(info);
1668         return err;
1669 }
1670
1671 static int snd_timer_user_params(struct file *file,
1672                                  struct snd_timer_params __user *_params)
1673 {
1674         struct snd_timer_user *tu;
1675         struct snd_timer_params params;
1676         struct snd_timer *t;
1677         struct snd_timer_read *tr;
1678         struct snd_timer_tread *ttr;
1679         int err;
1680
1681         tu = file->private_data;
1682         if (!tu->timeri)
1683                 return -EBADFD;
1684         t = tu->timeri->timer;
1685         if (!t)
1686                 return -EBADFD;
1687         if (copy_from_user(&params, _params, sizeof(params)))
1688                 return -EFAULT;
1689         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1690                 err = -EINVAL;
1691                 goto _end;
1692         }
1693         if (params.queue_size > 0 &&
1694             (params.queue_size < 32 || params.queue_size > 1024)) {
1695                 err = -EINVAL;
1696                 goto _end;
1697         }
1698         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1699                               (1<<SNDRV_TIMER_EVENT_TICK)|
1700                               (1<<SNDRV_TIMER_EVENT_START)|
1701                               (1<<SNDRV_TIMER_EVENT_STOP)|
1702                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1703                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1704                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1705                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1706                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1707                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1708                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1709                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1710                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1711                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1712                 err = -EINVAL;
1713                 goto _end;
1714         }
1715         snd_timer_stop(tu->timeri);
1716         spin_lock_irq(&t->lock);
1717         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1718                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1719                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1720         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1721                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1722         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1723                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1724         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1725                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1726         spin_unlock_irq(&t->lock);
1727         if (params.queue_size > 0 &&
1728             (unsigned int)tu->queue_size != params.queue_size) {
1729                 if (tu->tread) {
1730                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1731                                       GFP_KERNEL);
1732                         if (ttr) {
1733                                 kfree(tu->tqueue);
1734                                 tu->queue_size = params.queue_size;
1735                                 tu->tqueue = ttr;
1736                         }
1737                 } else {
1738                         tr = kmalloc(params.queue_size * sizeof(*tr),
1739                                      GFP_KERNEL);
1740                         if (tr) {
1741                                 kfree(tu->queue);
1742                                 tu->queue_size = params.queue_size;
1743                                 tu->queue = tr;
1744                         }
1745                 }
1746         }
1747         tu->qhead = tu->qtail = tu->qused = 0;
1748         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1749                 if (tu->tread) {
1750                         struct snd_timer_tread tread;
1751                         memset(&tread, 0, sizeof(tread));
1752                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1753                         tread.tstamp.tv_sec = 0;
1754                         tread.tstamp.tv_nsec = 0;
1755                         tread.val = 0;
1756                         snd_timer_user_append_to_tqueue(tu, &tread);
1757                 } else {
1758                         struct snd_timer_read *r = &tu->queue[0];
1759                         r->resolution = 0;
1760                         r->ticks = 0;
1761                         tu->qused++;
1762                         tu->qtail++;
1763                 }
1764         }
1765         tu->filter = params.filter;
1766         tu->ticks = params.ticks;
1767         err = 0;
1768  _end:
1769         if (copy_to_user(_params, &params, sizeof(params)))
1770                 return -EFAULT;
1771         return err;
1772 }
1773
1774 static int snd_timer_user_status(struct file *file,
1775                                  struct snd_timer_status __user *_status)
1776 {
1777         struct snd_timer_user *tu;
1778         struct snd_timer_status status;
1779
1780         tu = file->private_data;
1781         if (!tu->timeri)
1782                 return -EBADFD;
1783         memset(&status, 0, sizeof(status));
1784         status.tstamp = tu->tstamp;
1785         status.resolution = snd_timer_resolution(tu->timeri);
1786         status.lost = tu->timeri->lost;
1787         status.overrun = tu->overrun;
1788         spin_lock_irq(&tu->qlock);
1789         status.queue = tu->qused;
1790         spin_unlock_irq(&tu->qlock);
1791         if (copy_to_user(_status, &status, sizeof(status)))
1792                 return -EFAULT;
1793         return 0;
1794 }
1795
1796 static int snd_timer_user_start(struct file *file)
1797 {
1798         int err;
1799         struct snd_timer_user *tu;
1800
1801         tu = file->private_data;
1802         if (!tu->timeri)
1803                 return -EBADFD;
1804         snd_timer_stop(tu->timeri);
1805         tu->timeri->lost = 0;
1806         tu->last_resolution = 0;
1807         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1808 }
1809
1810 static int snd_timer_user_stop(struct file *file)
1811 {
1812         int err;
1813         struct snd_timer_user *tu;
1814
1815         tu = file->private_data;
1816         if (!tu->timeri)
1817                 return -EBADFD;
1818         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1819 }
1820
1821 static int snd_timer_user_continue(struct file *file)
1822 {
1823         int err;
1824         struct snd_timer_user *tu;
1825
1826         tu = file->private_data;
1827         if (!tu->timeri)
1828                 return -EBADFD;
1829         tu->timeri->lost = 0;
1830         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1831 }
1832
1833 static int snd_timer_user_pause(struct file *file)
1834 {
1835         int err;
1836         struct snd_timer_user *tu;
1837
1838         tu = file->private_data;
1839         if (!tu->timeri)
1840                 return -EBADFD;
1841         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1842 }
1843
1844 enum {
1845         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1846         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1847         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1848         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1849 };
1850
1851 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1852                                  unsigned long arg)
1853 {
1854         struct snd_timer_user *tu;
1855         void __user *argp = (void __user *)arg;
1856         int __user *p = argp;
1857
1858         tu = file->private_data;
1859         switch (cmd) {
1860         case SNDRV_TIMER_IOCTL_PVERSION:
1861                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1862         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1863                 return snd_timer_user_next_device(argp);
1864         case SNDRV_TIMER_IOCTL_TREAD:
1865         {
1866                 int xarg;
1867
1868                 if (tu->timeri) /* too late */
1869                         return -EBUSY;
1870                 if (get_user(xarg, p))
1871                         return -EFAULT;
1872                 tu->tread = xarg ? 1 : 0;
1873                 return 0;
1874         }
1875         case SNDRV_TIMER_IOCTL_GINFO:
1876                 return snd_timer_user_ginfo(file, argp);
1877         case SNDRV_TIMER_IOCTL_GPARAMS:
1878                 return snd_timer_user_gparams(file, argp);
1879         case SNDRV_TIMER_IOCTL_GSTATUS:
1880                 return snd_timer_user_gstatus(file, argp);
1881         case SNDRV_TIMER_IOCTL_SELECT:
1882                 return snd_timer_user_tselect(file, argp);
1883         case SNDRV_TIMER_IOCTL_INFO:
1884                 return snd_timer_user_info(file, argp);
1885         case SNDRV_TIMER_IOCTL_PARAMS:
1886                 return snd_timer_user_params(file, argp);
1887         case SNDRV_TIMER_IOCTL_STATUS:
1888                 return snd_timer_user_status(file, argp);
1889         case SNDRV_TIMER_IOCTL_START:
1890         case SNDRV_TIMER_IOCTL_START_OLD:
1891                 return snd_timer_user_start(file);
1892         case SNDRV_TIMER_IOCTL_STOP:
1893         case SNDRV_TIMER_IOCTL_STOP_OLD:
1894                 return snd_timer_user_stop(file);
1895         case SNDRV_TIMER_IOCTL_CONTINUE:
1896         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1897                 return snd_timer_user_continue(file);
1898         case SNDRV_TIMER_IOCTL_PAUSE:
1899         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1900                 return snd_timer_user_pause(file);
1901         }
1902         return -ENOTTY;
1903 }
1904
1905 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1906                                  unsigned long arg)
1907 {
1908         struct snd_timer_user *tu = file->private_data;
1909         long ret;
1910
1911         mutex_lock(&tu->ioctl_lock);
1912         ret = __snd_timer_user_ioctl(file, cmd, arg);
1913         mutex_unlock(&tu->ioctl_lock);
1914         return ret;
1915 }
1916
1917 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1918 {
1919         struct snd_timer_user *tu;
1920
1921         tu = file->private_data;
1922         return fasync_helper(fd, file, on, &tu->fasync);
1923 }
1924
1925 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1926                                    size_t count, loff_t *offset)
1927 {
1928         struct snd_timer_user *tu;
1929         long result = 0, unit;
1930         int qhead;
1931         int err = 0;
1932
1933         tu = file->private_data;
1934         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1935         spin_lock_irq(&tu->qlock);
1936         while ((long)count - result >= unit) {
1937                 while (!tu->qused) {
1938                         wait_queue_t wait;
1939
1940                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1941                                 err = -EAGAIN;
1942                                 goto _error;
1943                         }
1944
1945                         set_current_state(TASK_INTERRUPTIBLE);
1946                         init_waitqueue_entry(&wait, current);
1947                         add_wait_queue(&tu->qchange_sleep, &wait);
1948
1949                         spin_unlock_irq(&tu->qlock);
1950                         schedule();
1951                         spin_lock_irq(&tu->qlock);
1952
1953                         remove_wait_queue(&tu->qchange_sleep, &wait);
1954
1955                         if (tu->disconnected) {
1956                                 err = -ENODEV;
1957                                 goto _error;
1958                         }
1959                         if (signal_pending(current)) {
1960                                 err = -ERESTARTSYS;
1961                                 goto _error;
1962                         }
1963                 }
1964
1965                 qhead = tu->qhead++;
1966                 tu->qhead %= tu->queue_size;
1967                 spin_unlock_irq(&tu->qlock);
1968
1969                 if (tu->tread) {
1970                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1971                                          sizeof(struct snd_timer_tread)))
1972                                 err = -EFAULT;
1973                 } else {
1974                         if (copy_to_user(buffer, &tu->queue[qhead],
1975                                          sizeof(struct snd_timer_read)))
1976                                 err = -EFAULT;
1977                 }
1978
1979                 spin_lock_irq(&tu->qlock);
1980                 tu->qused--;
1981                 if (err < 0)
1982                         goto _error;
1983                 result += unit;
1984                 buffer += unit;
1985         }
1986  _error:
1987         spin_unlock_irq(&tu->qlock);
1988         return result > 0 ? result : err;
1989 }
1990
1991 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1992 {
1993         unsigned int mask;
1994         struct snd_timer_user *tu;
1995
1996         tu = file->private_data;
1997
1998         poll_wait(file, &tu->qchange_sleep, wait);
1999
2000         mask = 0;
2001         if (tu->qused)
2002                 mask |= POLLIN | POLLRDNORM;
2003         if (tu->disconnected)
2004                 mask |= POLLERR;
2005
2006         return mask;
2007 }
2008
2009 #ifdef CONFIG_COMPAT
2010 #include "timer_compat.c"
2011 #else
2012 #define snd_timer_user_ioctl_compat     NULL
2013 #endif
2014
2015 static const struct file_operations snd_timer_f_ops =
2016 {
2017         .owner =        THIS_MODULE,
2018         .read =         snd_timer_user_read,
2019         .open =         snd_timer_user_open,
2020         .release =      snd_timer_user_release,
2021         .llseek =       no_llseek,
2022         .poll =         snd_timer_user_poll,
2023         .unlocked_ioctl =       snd_timer_user_ioctl,
2024         .compat_ioctl = snd_timer_user_ioctl_compat,
2025         .fasync =       snd_timer_user_fasync,
2026 };
2027
2028 /* unregister the system timer */
2029 static void snd_timer_free_all(void)
2030 {
2031         struct snd_timer *timer, *n;
2032
2033         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2034                 snd_timer_free(timer);
2035 }
2036
2037 static struct device timer_dev;
2038
2039 /*
2040  *  ENTRY functions
2041  */
2042
2043 static int __init alsa_timer_init(void)
2044 {
2045         int err;
2046
2047         snd_device_initialize(&timer_dev, NULL);
2048         dev_set_name(&timer_dev, "timer");
2049
2050 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2051         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2052                               "system timer");
2053 #endif
2054
2055         err = snd_timer_register_system();
2056         if (err < 0) {
2057                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2058                 put_device(&timer_dev);
2059                 return err;
2060         }
2061
2062         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2063                                   &snd_timer_f_ops, NULL, &timer_dev);
2064         if (err < 0) {
2065                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2066                 snd_timer_free_all();
2067                 put_device(&timer_dev);
2068                 return err;
2069         }
2070
2071         snd_timer_proc_init();
2072         return 0;
2073 }
2074
2075 static void __exit alsa_timer_exit(void)
2076 {
2077         snd_unregister_device(&timer_dev);
2078         snd_timer_free_all();
2079         put_device(&timer_dev);
2080         snd_timer_proc_done();
2081 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2082         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2083 #endif
2084 }
2085
2086 module_init(alsa_timer_init)
2087 module_exit(alsa_timer_exit)
2088
2089 EXPORT_SYMBOL(snd_timer_open);
2090 EXPORT_SYMBOL(snd_timer_close);
2091 EXPORT_SYMBOL(snd_timer_resolution);
2092 EXPORT_SYMBOL(snd_timer_start);
2093 EXPORT_SYMBOL(snd_timer_stop);
2094 EXPORT_SYMBOL(snd_timer_continue);
2095 EXPORT_SYMBOL(snd_timer_pause);
2096 EXPORT_SYMBOL(snd_timer_new);
2097 EXPORT_SYMBOL(snd_timer_notify);
2098 EXPORT_SYMBOL(snd_timer_global_new);
2099 EXPORT_SYMBOL(snd_timer_global_free);
2100 EXPORT_SYMBOL(snd_timer_global_register);
2101 EXPORT_SYMBOL(snd_timer_interrupt);