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 static int snd_timer_dev_disconnect(struct snd_device *device)
 933 {
 934         struct snd_timer *timer = device->device_data;
 935         struct snd_timer_instance *ti;
 936
 937         mutex_lock(&register_mutex);
 938         list_del_init(&timer->device_list);
 939         /* wake up pending sleepers */
 940         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 941                 if (ti->disconnect)
 942                         ti->disconnect(ti);
 943         }
 944         mutex_unlock(&register_mutex);
 945         return 0;
 946 }
 947
 948 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 949 {
 950         unsigned long flags;
 951         unsigned long resolution = 0;
 952         struct snd_timer_instance *ti, *ts;
 953
 954         if (timer->card && timer->card->shutdown)
 955                 return;
 956         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 957                 return;
 958         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 959                        event > SNDRV_TIMER_EVENT_MRESUME))
 960                 return;
 961         spin_lock_irqsave(&timer->lock, flags);
 962         if (event == SNDRV_TIMER_EVENT_MSTART ||
 963             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 964             event == SNDRV_TIMER_EVENT_MRESUME) {
 965                 if (timer->hw.c_resolution)
 966                         resolution = timer->hw.c_resolution(timer);
 967                 else
 968                         resolution = timer->hw.resolution;
 969         }
 970         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 971                 if (ti->ccallback)
 972                         ti->ccallback(ti, event, tstamp, resolution);
 973                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 974                         if (ts->ccallback)
 975                                 ts->ccallback(ts, event, tstamp, resolution);
 976         }
 977         spin_unlock_irqrestore(&timer->lock, flags);
 978 }
 979
 980 /*
 981  * exported functions for global timers
 982  */
 983 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 984 {
 985         struct snd_timer_id tid;
 986
 987         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 988         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 989         tid.card = -1;
 990         tid.device = device;
 991         tid.subdevice = 0;
 992         return snd_timer_new(NULL, id, &tid, rtimer);
 993 }
 994
 995 int snd_timer_global_free(struct snd_timer *timer)
 996 {
 997         return snd_timer_free(timer);
 998 }
 999
1000 int snd_timer_global_register(struct snd_timer *timer)
1001 {
1002         struct snd_device dev;
1003
1004         memset(&dev, 0, sizeof(dev));
1005         dev.device_data = timer;
1006         return snd_timer_dev_register(&dev);
1007 }
1008
1009 /*
1010  *  System timer
1011  */
1012
1013 struct snd_timer_system_private {
1014         struct timer_list tlist;
1015         unsigned long last_expires;
1016         unsigned long last_jiffies;
1017         unsigned long correction;
1018 };
1019
1020 static void snd_timer_s_function(unsigned long data)
1021 {
1022         struct snd_timer *timer = (struct snd_timer *)data;
1023         struct snd_timer_system_private *priv = timer->private_data;
1024         unsigned long jiff = jiffies;
1025         if (time_after(jiff, priv->last_expires))
1026                 priv->correction += (long)jiff - (long)priv->last_expires;
1027         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1028 }
1029
1030 static int snd_timer_s_start(struct snd_timer * timer)
1031 {
1032         struct snd_timer_system_private *priv;
1033         unsigned long njiff;
1034
1035         priv = (struct snd_timer_system_private *) timer->private_data;
1036         njiff = (priv->last_jiffies = jiffies);
1037         if (priv->correction > timer->sticks - 1) {
1038                 priv->correction -= timer->sticks - 1;
1039                 njiff++;
1040         } else {
1041                 njiff += timer->sticks - priv->correction;
1042                 priv->correction = 0;
1043         }
1044         priv->last_expires = priv->tlist.expires = njiff;
1045         add_timer(&priv->tlist);
1046         return 0;
1047 }
1048
1049 static int snd_timer_s_stop(struct snd_timer * timer)
1050 {
1051         struct snd_timer_system_private *priv;
1052         unsigned long jiff;
1053
1054         priv = (struct snd_timer_system_private *) timer->private_data;
1055         del_timer(&priv->tlist);
1056         jiff = jiffies;
1057         if (time_before(jiff, priv->last_expires))
1058                 timer->sticks = priv->last_expires - jiff;
1059         else
1060                 timer->sticks = 1;
1061         priv->correction = 0;
1062         return 0;
1063 }
1064
1065 static int snd_timer_s_close(struct snd_timer *timer)
1066 {
1067         struct snd_timer_system_private *priv;
1068
1069         priv = (struct snd_timer_system_private *)timer->private_data;
1070         del_timer_sync(&priv->tlist);
1071         return 0;
1072 }
1073
1074 static struct snd_timer_hardware snd_timer_system =
1075 {
1076         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1077         .resolution =   1000000000L / HZ,
1078         .ticks =        10000000L,
1079         .close =        snd_timer_s_close,
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_disconnect(struct snd_timer_instance *timeri)
1261 {
1262         struct snd_timer_user *tu = timeri->callback_data;
1263
1264         tu->disconnected = true;
1265         wake_up(&tu->qchange_sleep);
1266 }
1267
1268 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1269                                       unsigned long resolution,
1270                                       unsigned long ticks)
1271 {
1272         struct snd_timer_user *tu = timeri->callback_data;
1273         struct snd_timer_tread *r, r1;
1274         struct timespec tstamp;
1275         int prev, append = 0;
1276
1277         memset(&tstamp, 0, sizeof(tstamp));
1278         spin_lock(&tu->qlock);
1279         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1280                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1281                 spin_unlock(&tu->qlock);
1282                 return;
1283         }
1284         if (tu->last_resolution != resolution || ticks > 0) {
1285                 if (timer_tstamp_monotonic)
1286                         ktime_get_ts(&tstamp);
1287                 else
1288                         getnstimeofday(&tstamp);
1289         }
1290         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1291             tu->last_resolution != resolution) {
1292                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1293                 r1.tstamp = tstamp;
1294                 r1.val = resolution;
1295                 snd_timer_user_append_to_tqueue(tu, &r1);
1296                 tu->last_resolution = resolution;
1297                 append++;
1298         }
1299         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1300                 goto __wake;
1301         if (ticks == 0)
1302                 goto __wake;
1303         if (tu->qused > 0) {
1304                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1305                 r = &tu->tqueue[prev];
1306                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1307                         r->tstamp = tstamp;
1308                         r->val += ticks;
1309                         append++;
1310                         goto __wake;
1311                 }
1312         }
1313         r1.event = SNDRV_TIMER_EVENT_TICK;
1314         r1.tstamp = tstamp;
1315         r1.val = ticks;
1316         snd_timer_user_append_to_tqueue(tu, &r1);
1317         append++;
1318       __wake:
1319         spin_unlock(&tu->qlock);
1320         if (append == 0)
1321                 return;
1322         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1323         wake_up(&tu->qchange_sleep);
1324 }
1325
1326 static int snd_timer_user_open(struct inode *inode, struct file *file)
1327 {
1328         struct snd_timer_user *tu;
1329         int err;
1330
1331         err = nonseekable_open(inode, file);
1332         if (err < 0)
1333                 return err;
1334
1335         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1336         if (tu == NULL)
1337                 return -ENOMEM;
1338         spin_lock_init(&tu->qlock);
1339         init_waitqueue_head(&tu->qchange_sleep);
1340         mutex_init(&tu->ioctl_lock);
1341         tu->ticks = 1;
1342         tu->queue_size = 128;
1343         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1344                             GFP_KERNEL);
1345         if (tu->queue == NULL) {
1346                 kfree(tu);
1347                 return -ENOMEM;
1348         }
1349         file->private_data = tu;
1350         return 0;
1351 }
1352
1353 static int snd_timer_user_release(struct inode *inode, struct file *file)
1354 {
1355         struct snd_timer_user *tu;
1356
1357         if (file->private_data) {
1358                 tu = file->private_data;
1359                 file->private_data = NULL;
1360                 mutex_lock(&tu->ioctl_lock);
1361                 if (tu->timeri)
1362                         snd_timer_close(tu->timeri);
1363                 mutex_unlock(&tu->ioctl_lock);
1364                 kfree(tu->queue);
1365                 kfree(tu->tqueue);
1366                 kfree(tu);
1367         }
1368         return 0;
1369 }
1370
1371 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1372 {
1373         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1374         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1375         id->card = -1;
1376         id->device = -1;
1377         id->subdevice = -1;
1378 }
1379
1380 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1381 {
1382         id->dev_class = timer->tmr_class;
1383         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1384         id->card = timer->card ? timer->card->number : -1;
1385         id->device = timer->tmr_device;
1386         id->subdevice = timer->tmr_subdevice;
1387 }
1388
1389 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1390 {
1391         struct snd_timer_id id;
1392         struct snd_timer *timer;
1393         struct list_head *p;
1394
1395         if (copy_from_user(&id, _tid, sizeof(id)))
1396                 return -EFAULT;
1397         mutex_lock(&register_mutex);
1398         if (id.dev_class < 0) {         /* first item */
1399                 if (list_empty(&snd_timer_list))
1400                         snd_timer_user_zero_id(&id);
1401                 else {
1402                         timer = list_entry(snd_timer_list.next,
1403                                            struct snd_timer, device_list);
1404                         snd_timer_user_copy_id(&id, timer);
1405                 }
1406         } else {
1407                 switch (id.dev_class) {
1408                 case SNDRV_TIMER_CLASS_GLOBAL:
1409                         id.device = id.device < 0 ? 0 : id.device + 1;
1410                         list_for_each(p, &snd_timer_list) {
1411                                 timer = list_entry(p, struct snd_timer, device_list);
1412                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1413                                         snd_timer_user_copy_id(&id, timer);
1414                                         break;
1415                                 }
1416                                 if (timer->tmr_device >= id.device) {
1417                                         snd_timer_user_copy_id(&id, timer);
1418                                         break;
1419                                 }
1420                         }
1421                         if (p == &snd_timer_list)
1422                                 snd_timer_user_zero_id(&id);
1423                         break;
1424                 case SNDRV_TIMER_CLASS_CARD:
1425                 case SNDRV_TIMER_CLASS_PCM:
1426                         if (id.card < 0) {
1427                                 id.card = 0;
1428                         } else {
1429                                 if (id.card < 0) {
1430                                         id.card = 0;
1431                                 } else {
1432                                         if (id.device < 0) {
1433                                                 id.device = 0;
1434                                         } else {
1435                                                 if (id.subdevice < 0) {
1436                                                         id.subdevice = 0;
1437                                                 } else {
1438                                                         id.subdevice++;
1439                                                 }
1440                                         }
1441                                 }
1442                         }
1443                         list_for_each(p, &snd_timer_list) {
1444                                 timer = list_entry(p, struct snd_timer, device_list);
1445                                 if (timer->tmr_class > id.dev_class) {
1446                                         snd_timer_user_copy_id(&id, timer);
1447                                         break;
1448                                 }
1449                                 if (timer->tmr_class < id.dev_class)
1450                                         continue;
1451                                 if (timer->card->number > id.card) {
1452                                         snd_timer_user_copy_id(&id, timer);
1453                                         break;
1454                                 }
1455                                 if (timer->card->number < id.card)
1456                                         continue;
1457                                 if (timer->tmr_device > id.device) {
1458                                         snd_timer_user_copy_id(&id, timer);
1459                                         break;
1460                                 }
1461                                 if (timer->tmr_device < id.device)
1462                                         continue;
1463                                 if (timer->tmr_subdevice > id.subdevice) {
1464                                         snd_timer_user_copy_id(&id, timer);
1465                                         break;
1466                                 }
1467                                 if (timer->tmr_subdevice < id.subdevice)
1468                                         continue;
1469                                 snd_timer_user_copy_id(&id, timer);
1470                                 break;
1471                         }
1472                         if (p == &snd_timer_list)
1473                                 snd_timer_user_zero_id(&id);
1474                         break;
1475                 default:
1476                         snd_timer_user_zero_id(&id);
1477                 }
1478         }
1479         mutex_unlock(&register_mutex);
1480         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1481                 return -EFAULT;
1482         return 0;
1483 }
1484
1485 static int snd_timer_user_ginfo(struct file *file,
1486                                 struct snd_timer_ginfo __user *_ginfo)
1487 {
1488         struct snd_timer_ginfo *ginfo;
1489         struct snd_timer_id tid;
1490         struct snd_timer *t;
1491         struct list_head *p;
1492         int err = 0;
1493
1494         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1495         if (IS_ERR(ginfo))
1496                 return PTR_ERR(ginfo);
1497
1498         tid = ginfo->tid;
1499         memset(ginfo, 0, sizeof(*ginfo));
1500         ginfo->tid = tid;
1501         mutex_lock(&register_mutex);
1502         t = snd_timer_find(&tid);
1503         if (t != NULL) {
1504                 ginfo->card = t->card ? t->card->number : -1;
1505                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1506                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1507                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1508                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1509                 ginfo->resolution = t->hw.resolution;
1510                 if (t->hw.resolution_min > 0) {
1511                         ginfo->resolution_min = t->hw.resolution_min;
1512                         ginfo->resolution_max = t->hw.resolution_max;
1513                 }
1514                 list_for_each(p, &t->open_list_head) {
1515                         ginfo->clients++;
1516                 }
1517         } else {
1518                 err = -ENODEV;
1519         }
1520         mutex_unlock(&register_mutex);
1521         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1522                 err = -EFAULT;
1523         kfree(ginfo);
1524         return err;
1525 }
1526
1527 static int snd_timer_user_gparams(struct file *file,
1528                                   struct snd_timer_gparams __user *_gparams)
1529 {
1530         struct snd_timer_gparams gparams;
1531         struct snd_timer *t;
1532         int err;
1533
1534         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1535                 return -EFAULT;
1536         mutex_lock(&register_mutex);
1537         t = snd_timer_find(&gparams.tid);
1538         if (!t) {
1539                 err = -ENODEV;
1540                 goto _error;
1541         }
1542         if (!list_empty(&t->open_list_head)) {
1543                 err = -EBUSY;
1544                 goto _error;
1545         }
1546         if (!t->hw.set_period) {
1547                 err = -ENOSYS;
1548                 goto _error;
1549         }
1550         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1551 _error:
1552         mutex_unlock(&register_mutex);
1553         return err;
1554 }
1555
1556 static int snd_timer_user_gstatus(struct file *file,
1557                                   struct snd_timer_gstatus __user *_gstatus)
1558 {
1559         struct snd_timer_gstatus gstatus;
1560         struct snd_timer_id tid;
1561         struct snd_timer *t;
1562         int err = 0;
1563
1564         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1565                 return -EFAULT;
1566         tid = gstatus.tid;
1567         memset(&gstatus, 0, sizeof(gstatus));
1568         gstatus.tid = tid;
1569         mutex_lock(&register_mutex);
1570         t = snd_timer_find(&tid);
1571         if (t != NULL) {
1572                 if (t->hw.c_resolution)
1573                         gstatus.resolution = t->hw.c_resolution(t);
1574                 else
1575                         gstatus.resolution = t->hw.resolution;
1576                 if (t->hw.precise_resolution) {
1577                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1578                                                  &gstatus.resolution_den);
1579                 } else {
1580                         gstatus.resolution_num = gstatus.resolution;
1581                         gstatus.resolution_den = 1000000000uL;
1582                 }
1583         } else {
1584                 err = -ENODEV;
1585         }
1586         mutex_unlock(&register_mutex);
1587         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1588                 err = -EFAULT;
1589         return err;
1590 }
1591
1592 static int snd_timer_user_tselect(struct file *file,
1593                                   struct snd_timer_select __user *_tselect)
1594 {
1595         struct snd_timer_user *tu;
1596         struct snd_timer_select tselect;
1597         char str[32];
1598         int err = 0;
1599
1600         tu = file->private_data;
1601         if (tu->timeri) {
1602                 snd_timer_close(tu->timeri);
1603                 tu->timeri = NULL;
1604         }
1605         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1606                 err = -EFAULT;
1607                 goto __err;
1608         }
1609         sprintf(str, "application %i", current->pid);
1610         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1611                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1612         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1613         if (err < 0)
1614                 goto __err;
1615
1616         kfree(tu->queue);
1617         tu->queue = NULL;
1618         kfree(tu->tqueue);
1619         tu->tqueue = NULL;
1620         if (tu->tread) {
1621                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1622                                      GFP_KERNEL);
1623                 if (tu->tqueue == NULL)
1624                         err = -ENOMEM;
1625         } else {
1626                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1627                                     GFP_KERNEL);
1628                 if (tu->queue == NULL)
1629                         err = -ENOMEM;
1630         }
1631
1632         if (err < 0) {
1633                 snd_timer_close(tu->timeri);
1634                 tu->timeri = NULL;
1635         } else {
1636                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1637                 tu->timeri->callback = tu->tread
1638                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1639                 tu->timeri->ccallback = snd_timer_user_ccallback;
1640                 tu->timeri->callback_data = (void *)tu;
1641                 tu->timeri->disconnect = snd_timer_user_disconnect;
1642         }
1643
1644       __err:
1645         return err;
1646 }
1647
1648 static int snd_timer_user_info(struct file *file,
1649                                struct snd_timer_info __user *_info)
1650 {
1651         struct snd_timer_user *tu;
1652         struct snd_timer_info *info;
1653         struct snd_timer *t;
1654         int err = 0;
1655
1656         tu = file->private_data;
1657         if (!tu->timeri)
1658                 return -EBADFD;
1659         t = tu->timeri->timer;
1660         if (!t)
1661                 return -EBADFD;
1662
1663         info = kzalloc(sizeof(*info), GFP_KERNEL);
1664         if (! info)
1665                 return -ENOMEM;
1666         info->card = t->card ? t->card->number : -1;
1667         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1668                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1669         strlcpy(info->id, t->id, sizeof(info->id));
1670         strlcpy(info->name, t->name, sizeof(info->name));
1671         info->resolution = t->hw.resolution;
1672         if (copy_to_user(_info, info, sizeof(*_info)))
1673                 err = -EFAULT;
1674         kfree(info);
1675         return err;
1676 }
1677
1678 static int snd_timer_user_params(struct file *file,
1679                                  struct snd_timer_params __user *_params)
1680 {
1681         struct snd_timer_user *tu;
1682         struct snd_timer_params params;
1683         struct snd_timer *t;
1684         struct snd_timer_read *tr;
1685         struct snd_timer_tread *ttr;
1686         int err;
1687
1688         tu = file->private_data;
1689         if (!tu->timeri)
1690                 return -EBADFD;
1691         t = tu->timeri->timer;
1692         if (!t)
1693                 return -EBADFD;
1694         if (copy_from_user(&params, _params, sizeof(params)))
1695                 return -EFAULT;
1696         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1697                 err = -EINVAL;
1698                 goto _end;
1699         }
1700         if (params.queue_size > 0 &&
1701             (params.queue_size < 32 || params.queue_size > 1024)) {
1702                 err = -EINVAL;
1703                 goto _end;
1704         }
1705         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1706                               (1<<SNDRV_TIMER_EVENT_TICK)|
1707                               (1<<SNDRV_TIMER_EVENT_START)|
1708                               (1<<SNDRV_TIMER_EVENT_STOP)|
1709                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1710                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1711                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1712                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1713                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1714                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1715                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1716                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1717                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1718                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1719                 err = -EINVAL;
1720                 goto _end;
1721         }
1722         snd_timer_stop(tu->timeri);
1723         spin_lock_irq(&t->lock);
1724         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1725                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1726                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1727         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1728                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1729         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1730                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1731         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1732                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1733         spin_unlock_irq(&t->lock);
1734         if (params.queue_size > 0 &&
1735             (unsigned int)tu->queue_size != params.queue_size) {
1736                 if (tu->tread) {
1737                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1738                                       GFP_KERNEL);
1739                         if (ttr) {
1740                                 kfree(tu->tqueue);
1741                                 tu->queue_size = params.queue_size;
1742                                 tu->tqueue = ttr;
1743                         }
1744                 } else {
1745                         tr = kmalloc(params.queue_size * sizeof(*tr),
1746                                      GFP_KERNEL);
1747                         if (tr) {
1748                                 kfree(tu->queue);
1749                                 tu->queue_size = params.queue_size;
1750                                 tu->queue = tr;
1751                         }
1752                 }
1753         }
1754         tu->qhead = tu->qtail = tu->qused = 0;
1755         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1756                 if (tu->tread) {
1757                         struct snd_timer_tread tread;
1758                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1759                         tread.tstamp.tv_sec = 0;
1760                         tread.tstamp.tv_nsec = 0;
1761                         tread.val = 0;
1762                         snd_timer_user_append_to_tqueue(tu, &tread);
1763                 } else {
1764                         struct snd_timer_read *r = &tu->queue[0];
1765                         r->resolution = 0;
1766                         r->ticks = 0;
1767                         tu->qused++;
1768                         tu->qtail++;
1769                 }
1770         }
1771         tu->filter = params.filter;
1772         tu->ticks = params.ticks;
1773         err = 0;
1774  _end:
1775         if (copy_to_user(_params, &params, sizeof(params)))
1776                 return -EFAULT;
1777         return err;
1778 }
1779
1780 static int snd_timer_user_status(struct file *file,
1781                                  struct snd_timer_status __user *_status)
1782 {
1783         struct snd_timer_user *tu;
1784         struct snd_timer_status status;
1785
1786         tu = file->private_data;
1787         if (!tu->timeri)
1788                 return -EBADFD;
1789         memset(&status, 0, sizeof(status));
1790         status.tstamp = tu->tstamp;
1791         status.resolution = snd_timer_resolution(tu->timeri);
1792         status.lost = tu->timeri->lost;
1793         status.overrun = tu->overrun;
1794         spin_lock_irq(&tu->qlock);
1795         status.queue = tu->qused;
1796         spin_unlock_irq(&tu->qlock);
1797         if (copy_to_user(_status, &status, sizeof(status)))
1798                 return -EFAULT;
1799         return 0;
1800 }
1801
1802 static int snd_timer_user_start(struct file *file)
1803 {
1804         int err;
1805         struct snd_timer_user *tu;
1806
1807         tu = file->private_data;
1808         if (!tu->timeri)
1809                 return -EBADFD;
1810         snd_timer_stop(tu->timeri);
1811         tu->timeri->lost = 0;
1812         tu->last_resolution = 0;
1813         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1814 }
1815
1816 static int snd_timer_user_stop(struct file *file)
1817 {
1818         int err;
1819         struct snd_timer_user *tu;
1820
1821         tu = file->private_data;
1822         if (!tu->timeri)
1823                 return -EBADFD;
1824         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1825 }
1826
1827 static int snd_timer_user_continue(struct file *file)
1828 {
1829         int err;
1830         struct snd_timer_user *tu;
1831
1832         tu = file->private_data;
1833         if (!tu->timeri)
1834                 return -EBADFD;
1835         tu->timeri->lost = 0;
1836         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1837 }
1838
1839 static int snd_timer_user_pause(struct file *file)
1840 {
1841         int err;
1842         struct snd_timer_user *tu;
1843
1844         tu = file->private_data;
1845         if (!tu->timeri)
1846                 return -EBADFD;
1847         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1848 }
1849
1850 enum {
1851         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1852         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1853         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1854         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1855 };
1856
1857 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1858                                  unsigned long arg)
1859 {
1860         struct snd_timer_user *tu;
1861         void __user *argp = (void __user *)arg;
1862         int __user *p = argp;
1863
1864         tu = file->private_data;
1865         switch (cmd) {
1866         case SNDRV_TIMER_IOCTL_PVERSION:
1867                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1868         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1869                 return snd_timer_user_next_device(argp);
1870         case SNDRV_TIMER_IOCTL_TREAD:
1871         {
1872                 int xarg;
1873
1874                 if (tu->timeri) /* too late */
1875                         return -EBUSY;
1876                 if (get_user(xarg, p))
1877                         return -EFAULT;
1878                 tu->tread = xarg ? 1 : 0;
1879                 return 0;
1880         }
1881         case SNDRV_TIMER_IOCTL_GINFO:
1882                 return snd_timer_user_ginfo(file, argp);
1883         case SNDRV_TIMER_IOCTL_GPARAMS:
1884                 return snd_timer_user_gparams(file, argp);
1885         case SNDRV_TIMER_IOCTL_GSTATUS:
1886                 return snd_timer_user_gstatus(file, argp);
1887         case SNDRV_TIMER_IOCTL_SELECT:
1888                 return snd_timer_user_tselect(file, argp);
1889         case SNDRV_TIMER_IOCTL_INFO:
1890                 return snd_timer_user_info(file, argp);
1891         case SNDRV_TIMER_IOCTL_PARAMS:
1892                 return snd_timer_user_params(file, argp);
1893         case SNDRV_TIMER_IOCTL_STATUS:
1894                 return snd_timer_user_status(file, argp);
1895         case SNDRV_TIMER_IOCTL_START:
1896         case SNDRV_TIMER_IOCTL_START_OLD:
1897                 return snd_timer_user_start(file);
1898         case SNDRV_TIMER_IOCTL_STOP:
1899         case SNDRV_TIMER_IOCTL_STOP_OLD:
1900                 return snd_timer_user_stop(file);
1901         case SNDRV_TIMER_IOCTL_CONTINUE:
1902         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1903                 return snd_timer_user_continue(file);
1904         case SNDRV_TIMER_IOCTL_PAUSE:
1905         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1906                 return snd_timer_user_pause(file);
1907         }
1908         return -ENOTTY;
1909 }
1910
1911 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1912                                  unsigned long arg)
1913 {
1914         struct snd_timer_user *tu = file->private_data;
1915         long ret;
1916
1917         mutex_lock(&tu->ioctl_lock);
1918         ret = __snd_timer_user_ioctl(file, cmd, arg);
1919         mutex_unlock(&tu->ioctl_lock);
1920         return ret;
1921 }
1922
1923 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1924 {
1925         struct snd_timer_user *tu;
1926
1927         tu = file->private_data;
1928         return fasync_helper(fd, file, on, &tu->fasync);
1929 }
1930
1931 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1932                                    size_t count, loff_t *offset)
1933 {
1934         struct snd_timer_user *tu;
1935         long result = 0, unit;
1936         int err = 0;
1937
1938         tu = file->private_data;
1939         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1940         spin_lock_irq(&tu->qlock);
1941         while ((long)count - result >= unit) {
1942                 while (!tu->qused) {
1943                         wait_queue_t wait;
1944
1945                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1946                                 err = -EAGAIN;
1947                                 break;
1948                         }
1949
1950                         set_current_state(TASK_INTERRUPTIBLE);
1951                         init_waitqueue_entry(&wait, current);
1952                         add_wait_queue(&tu->qchange_sleep, &wait);
1953
1954                         spin_unlock_irq(&tu->qlock);
1955                         schedule();
1956                         spin_lock_irq(&tu->qlock);
1957
1958                         remove_wait_queue(&tu->qchange_sleep, &wait);
1959
1960                         if (tu->disconnected) {
1961                                 err = -ENODEV;
1962                                 break;
1963                         }
1964                         if (signal_pending(current)) {
1965                                 err = -ERESTARTSYS;
1966                                 break;
1967                         }
1968                 }
1969
1970                 spin_unlock_irq(&tu->qlock);
1971                 if (err < 0)
1972                         goto _error;
1973
1974                 if (tu->tread) {
1975                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1976                                          sizeof(struct snd_timer_tread))) {
1977                                 err = -EFAULT;
1978                                 goto _error;
1979                         }
1980                 } else {
1981                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1982                                          sizeof(struct snd_timer_read))) {
1983                                 err = -EFAULT;
1984                                 goto _error;
1985                         }
1986                 }
1987
1988                 tu->qhead %= tu->queue_size;
1989
1990                 result += unit;
1991                 buffer += unit;
1992
1993                 spin_lock_irq(&tu->qlock);
1994                 tu->qused--;
1995         }
1996         spin_unlock_irq(&tu->qlock);
1997  _error:
1998         return result > 0 ? result : err;
1999 }
2000
2001 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2002 {
2003         unsigned int mask;
2004         struct snd_timer_user *tu;
2005
2006         tu = file->private_data;
2007
2008         poll_wait(file, &tu->qchange_sleep, wait);
2009
2010         mask = 0;
2011         if (tu->qused)
2012                 mask |= POLLIN | POLLRDNORM;
2013         if (tu->disconnected)
2014                 mask |= POLLERR;
2015
2016         return mask;
2017 }
2018
2019 #ifdef CONFIG_COMPAT
2020 #include "timer_compat.c"
2021 #else
2022 #define snd_timer_user_ioctl_compat     NULL
2023 #endif
2024
2025 static const struct file_operations snd_timer_f_ops =
2026 {
2027         .owner =        THIS_MODULE,
2028         .read =         snd_timer_user_read,
2029         .open =         snd_timer_user_open,
2030         .release =      snd_timer_user_release,
2031         .llseek =       no_llseek,
2032         .poll =         snd_timer_user_poll,
2033         .unlocked_ioctl =       snd_timer_user_ioctl,
2034         .compat_ioctl = snd_timer_user_ioctl_compat,
2035         .fasync =       snd_timer_user_fasync,
2036 };
2037
2038 /* unregister the system timer */
2039 static void snd_timer_free_all(void)
2040 {
2041         struct snd_timer *timer, *n;
2042
2043         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2044                 snd_timer_free(timer);
2045 }
2046
2047 static struct device timer_dev;
2048
2049 /*
2050  *  ENTRY functions
2051  */
2052
2053 static int __init alsa_timer_init(void)
2054 {
2055         int err;
2056
2057         snd_device_initialize(&timer_dev, NULL);
2058         dev_set_name(&timer_dev, "timer");
2059
2060 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2061         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2062                               "system timer");
2063 #endif
2064
2065         err = snd_timer_register_system();
2066         if (err < 0) {
2067                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2068                 put_device(&timer_dev);
2069                 return err;
2070         }
2071
2072         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2073                                   &snd_timer_f_ops, NULL, &timer_dev);
2074         if (err < 0) {
2075                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2076                 snd_timer_free_all();
2077                 put_device(&timer_dev);
2078                 return err;
2079         }
2080
2081         snd_timer_proc_init();
2082         return 0;
2083 }
2084
2085 static void __exit alsa_timer_exit(void)
2086 {
2087         snd_unregister_device(&timer_dev);
2088         snd_timer_free_all();
2089         put_device(&timer_dev);
2090         snd_timer_proc_done();
2091 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2092         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2093 #endif
2094 }
2095
2096 module_init(alsa_timer_init)
2097 module_exit(alsa_timer_exit)
2098
2099 EXPORT_SYMBOL(snd_timer_open);
2100 EXPORT_SYMBOL(snd_timer_close);
2101 EXPORT_SYMBOL(snd_timer_resolution);
2102 EXPORT_SYMBOL(snd_timer_start);
2103 EXPORT_SYMBOL(snd_timer_stop);
2104 EXPORT_SYMBOL(snd_timer_continue);
2105 EXPORT_SYMBOL(snd_timer_pause);
2106 EXPORT_SYMBOL(snd_timer_new);
2107 EXPORT_SYMBOL(snd_timer_notify);
2108 EXPORT_SYMBOL(snd_timer_global_new);
2109 EXPORT_SYMBOL(snd_timer_global_free);
2110 EXPORT_SYMBOL(snd_timer_global_register);
2111 EXPORT_SYMBOL(snd_timer_interrupt);