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                 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 522                 list_del_init(&timeri->ack_list);
 523                 list_del_init(&timeri->active_list);
 524                 spin_unlock_irqrestore(&slave_active_lock, flags);
 525                 goto __end;
 526         }
 527         timer = timeri->timer;
 528         if (!timer)
 529                 return -EINVAL;
 530         spin_lock_irqsave(&timer->lock, flags);
 531         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 532                                SNDRV_TIMER_IFLG_START))) {
 533                 spin_unlock_irqrestore(&timer->lock, flags);
 534                 return -EBUSY;
 535         }
 536         list_del_init(&timeri->ack_list);
 537         list_del_init(&timeri->active_list);
 538         if (timer->card && timer->card->shutdown) {
 539                 spin_unlock_irqrestore(&timer->lock, flags);
 540                 return 0;
 541         }
 542         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 543             !(--timer->running)) {
 544                 timer->hw.stop(timer);
 545                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 546                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 547                         snd_timer_reschedule(timer, 0);
 548                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 549                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 550                                 timer->hw.start(timer);
 551                         }
 552                 }
 553         }
 554         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 555         spin_unlock_irqrestore(&timer->lock, flags);
 556       __end:
 557         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 558                 snd_timer_notify1(timeri, event);
 559         return 0;
 560 }
 561
 562 /*
 563  * stop the timer instance.
 564  *
 565  * do not call this from the timer callback!
 566  */
 567 int snd_timer_stop(struct snd_timer_instance *timeri)
 568 {
 569         struct snd_timer *timer;
 570         unsigned long flags;
 571         int err;
 572
 573         err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP);
 574         if (err < 0)
 575                 return err;
 576         timer = timeri->timer;
 577         if (!timer)
 578                 return -EINVAL;
 579         spin_lock_irqsave(&timer->lock, flags);
 580         timeri->cticks = timeri->ticks;
 581         timeri->pticks = 0;
 582         spin_unlock_irqrestore(&timer->lock, flags);
 583         return 0;
 584 }
 585
 586 /*
 587  * start again..  the tick is kept.
 588  */
 589 int snd_timer_continue(struct snd_timer_instance *timeri)
 590 {
 591         struct snd_timer *timer;
 592         int result = -EINVAL;
 593         unsigned long flags;
 594
 595         if (timeri == NULL)
 596                 return result;
 597         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 598                 return snd_timer_start_slave(timeri);
 599         timer = timeri->timer;
 600         if (! timer)
 601                 return -EINVAL;
 602         if (timer->card && timer->card->shutdown)
 603                 return -ENODEV;
 604         spin_lock_irqsave(&timer->lock, flags);
 605         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 606                 result = -EBUSY;
 607                 goto unlock;
 608         }
 609         if (!timeri->cticks)
 610                 timeri->cticks = 1;
 611         timeri->pticks = 0;
 612         result = snd_timer_start1(timer, timeri, timer->sticks);
 613  unlock:
 614         spin_unlock_irqrestore(&timer->lock, flags);
 615         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
 616         return result;
 617 }
 618
 619 /*
 620  * pause.. remember the ticks left
 621  */
 622 int snd_timer_pause(struct snd_timer_instance * timeri)
 623 {
 624         return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE);
 625 }
 626
 627 /*
 628  * reschedule the timer
 629  *
 630  * start pending instances and check the scheduling ticks.
 631  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 632  */
 633 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 634 {
 635         struct snd_timer_instance *ti;
 636         unsigned long ticks = ~0UL;
 637
 638         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 639                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 640                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 641                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 642                         timer->running++;
 643                 }
 644                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 645                         if (ticks > ti->cticks)
 646                                 ticks = ti->cticks;
 647                 }
 648         }
 649         if (ticks == ~0UL) {
 650                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 651                 return;
 652         }
 653         if (ticks > timer->hw.ticks)
 654                 ticks = timer->hw.ticks;
 655         if (ticks_left != ticks)
 656                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 657         timer->sticks = ticks;
 658 }
 659
 660 /*
 661  * timer tasklet
 662  *
 663  */
 664 static void snd_timer_tasklet(unsigned long arg)
 665 {
 666         struct snd_timer *timer = (struct snd_timer *) arg;
 667         struct snd_timer_instance *ti;
 668         struct list_head *p;
 669         unsigned long resolution, ticks;
 670         unsigned long flags;
 671
 672         if (timer->card && timer->card->shutdown)
 673                 return;
 674
 675         spin_lock_irqsave(&timer->lock, flags);
 676         /* now process all callbacks */
 677         while (!list_empty(&timer->sack_list_head)) {
 678                 p = timer->sack_list_head.next;         /* get first item */
 679                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 680
 681                 /* remove from ack_list and make empty */
 682                 list_del_init(p);
 683
 684                 ticks = ti->pticks;
 685                 ti->pticks = 0;
 686                 resolution = ti->resolution;
 687
 688                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 689                 spin_unlock(&timer->lock);
 690                 if (ti->callback)
 691                         ti->callback(ti, resolution, ticks);
 692                 spin_lock(&timer->lock);
 693                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 694         }
 695         spin_unlock_irqrestore(&timer->lock, flags);
 696 }
 697
 698 /*
 699  * timer interrupt
 700  *
 701  * ticks_left is usually equal to timer->sticks.
 702  *
 703  */
 704 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 705 {
 706         struct snd_timer_instance *ti, *ts, *tmp;
 707         unsigned long resolution, ticks;
 708         struct list_head *p, *ack_list_head;
 709         unsigned long flags;
 710         int use_tasklet = 0;
 711
 712         if (timer == NULL)
 713                 return;
 714
 715         if (timer->card && timer->card->shutdown)
 716                 return;
 717
 718         spin_lock_irqsave(&timer->lock, flags);
 719
 720         /* remember the current resolution */
 721         if (timer->hw.c_resolution)
 722                 resolution = timer->hw.c_resolution(timer);
 723         else
 724                 resolution = timer->hw.resolution;
 725
 726         /* loop for all active instances
 727          * Here we cannot use list_for_each_entry because the active_list of a
 728          * processed instance is relinked to done_list_head before the callback
 729          * is called.
 730          */
 731         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 732                                  active_list) {
 733                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 734                         continue;
 735                 ti->pticks += ticks_left;
 736                 ti->resolution = resolution;
 737                 if (ti->cticks < ticks_left)
 738                         ti->cticks = 0;
 739                 else
 740                         ti->cticks -= ticks_left;
 741                 if (ti->cticks) /* not expired */
 742                         continue;
 743                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 744                         ti->cticks = ti->ticks;
 745                 } else {
 746                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 747                         --timer->running;
 748                         list_del_init(&ti->active_list);
 749                 }
 750                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 751                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 752                         ack_list_head = &timer->ack_list_head;
 753                 else
 754                         ack_list_head = &timer->sack_list_head;
 755                 if (list_empty(&ti->ack_list))
 756                         list_add_tail(&ti->ack_list, ack_list_head);
 757                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 758                         ts->pticks = ti->pticks;
 759                         ts->resolution = resolution;
 760                         if (list_empty(&ts->ack_list))
 761                                 list_add_tail(&ts->ack_list, ack_list_head);
 762                 }
 763         }
 764         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 765                 snd_timer_reschedule(timer, timer->sticks);
 766         if (timer->running) {
 767                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 768                         timer->hw.stop(timer);
 769                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 770                 }
 771                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 772                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 773                         /* restart timer */
 774                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 775                         timer->hw.start(timer);
 776                 }
 777         } else {
 778                 timer->hw.stop(timer);
 779         }
 780
 781         /* now process all fast callbacks */
 782         while (!list_empty(&timer->ack_list_head)) {
 783                 p = timer->ack_list_head.next;          /* get first item */
 784                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 785
 786                 /* remove from ack_list and make empty */
 787                 list_del_init(p);
 788
 789                 ticks = ti->pticks;
 790                 ti->pticks = 0;
 791
 792                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 793                 spin_unlock(&timer->lock);
 794                 if (ti->callback)
 795                         ti->callback(ti, resolution, ticks);
 796                 spin_lock(&timer->lock);
 797                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 798         }
 799
 800         /* do we have any slow callbacks? */
 801         use_tasklet = !list_empty(&timer->sack_list_head);
 802         spin_unlock_irqrestore(&timer->lock, flags);
 803
 804         if (use_tasklet)
 805                 tasklet_schedule(&timer->task_queue);
 806 }
 807
 808 /*
 809
 810  */
 811
 812 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 813                   struct snd_timer **rtimer)
 814 {
 815         struct snd_timer *timer;
 816         int err;
 817         static struct snd_device_ops ops = {
 818                 .dev_free = snd_timer_dev_free,
 819                 .dev_register = snd_timer_dev_register,
 820                 .dev_disconnect = snd_timer_dev_disconnect,
 821         };
 822
 823         if (snd_BUG_ON(!tid))
 824                 return -EINVAL;
 825         if (rtimer)
 826                 *rtimer = NULL;
 827         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 828         if (!timer)
 829                 return -ENOMEM;
 830         timer->tmr_class = tid->dev_class;
 831         timer->card = card;
 832         timer->tmr_device = tid->device;
 833         timer->tmr_subdevice = tid->subdevice;
 834         if (id)
 835                 strlcpy(timer->id, id, sizeof(timer->id));
 836         INIT_LIST_HEAD(&timer->device_list);
 837         INIT_LIST_HEAD(&timer->open_list_head);
 838         INIT_LIST_HEAD(&timer->active_list_head);
 839         INIT_LIST_HEAD(&timer->ack_list_head);
 840         INIT_LIST_HEAD(&timer->sack_list_head);
 841         spin_lock_init(&timer->lock);
 842         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 843                      (unsigned long)timer);
 844         if (card != NULL) {
 845                 timer->module = card->module;
 846                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 847                 if (err < 0) {
 848                         snd_timer_free(timer);
 849                         return err;
 850                 }
 851         }
 852         if (rtimer)
 853                 *rtimer = timer;
 854         return 0;
 855 }
 856
 857 static int snd_timer_free(struct snd_timer *timer)
 858 {
 859         if (!timer)
 860                 return 0;
 861
 862         mutex_lock(&register_mutex);
 863         if (! list_empty(&timer->open_list_head)) {
 864                 struct list_head *p, *n;
 865                 struct snd_timer_instance *ti;
 866                 pr_warn("ALSA: timer %p is busy?\n", timer);
 867                 list_for_each_safe(p, n, &timer->open_list_head) {
 868                         list_del_init(p);
 869                         ti = list_entry(p, struct snd_timer_instance, open_list);
 870                         ti->timer = NULL;
 871                 }
 872         }
 873         list_del(&timer->device_list);
 874         mutex_unlock(&register_mutex);
 875
 876         if (timer->private_free)
 877                 timer->private_free(timer);
 878         kfree(timer);
 879         return 0;
 880 }
 881
 882 static int snd_timer_dev_free(struct snd_device *device)
 883 {
 884         struct snd_timer *timer = device->device_data;
 885         return snd_timer_free(timer);
 886 }
 887
 888 static int snd_timer_dev_register(struct snd_device *dev)
 889 {
 890         struct snd_timer *timer = dev->device_data;
 891         struct snd_timer *timer1;
 892
 893         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 894                 return -ENXIO;
 895         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 896             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 897                 return -EINVAL;
 898
 899         mutex_lock(&register_mutex);
 900         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 901                 if (timer1->tmr_class > timer->tmr_class)
 902                         break;
 903                 if (timer1->tmr_class < timer->tmr_class)
 904                         continue;
 905                 if (timer1->card && timer->card) {
 906                         if (timer1->card->number > timer->card->number)
 907                                 break;
 908                         if (timer1->card->number < timer->card->number)
 909                                 continue;
 910                 }
 911                 if (timer1->tmr_device > timer->tmr_device)
 912                         break;
 913                 if (timer1->tmr_device < timer->tmr_device)
 914                         continue;
 915                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 916                         break;
 917                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 918                         continue;
 919                 /* conflicts.. */
 920                 mutex_unlock(&register_mutex);
 921                 return -EBUSY;
 922         }
 923         list_add_tail(&timer->device_list, &timer1->device_list);
 924         mutex_unlock(&register_mutex);
 925         return 0;
 926 }
 927
 928 /* just for reference in snd_timer_dev_disconnect() below */
 929 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
 930                                      int event, struct timespec *tstamp,
 931                                      unsigned long resolution);
 932
 933 static int snd_timer_dev_disconnect(struct snd_device *device)
 934 {
 935         struct snd_timer *timer = device->device_data;
 936         struct snd_timer_instance *ti;
 937
 938         mutex_lock(&register_mutex);
 939         list_del_init(&timer->device_list);
 940         /* wake up pending sleepers */
 941         list_for_each_entry(ti, &timer->open_list_head, open_list) {
 942                 /* FIXME: better to have a ti.disconnect() op */
 943                 if (ti->ccallback == snd_timer_user_ccallback) {
 944                         struct snd_timer_user *tu = ti->callback_data;
 945
 946                         tu->disconnected = true;
 947                         wake_up(&tu->qchange_sleep);
 948                 }
 949         }
 950         mutex_unlock(&register_mutex);
 951         return 0;
 952 }
 953
 954 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 955 {
 956         unsigned long flags;
 957         unsigned long resolution = 0;
 958         struct snd_timer_instance *ti, *ts;
 959
 960         if (timer->card && timer->card->shutdown)
 961                 return;
 962         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 963                 return;
 964         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 965                        event > SNDRV_TIMER_EVENT_MRESUME))
 966                 return;
 967         spin_lock_irqsave(&timer->lock, flags);
 968         if (event == SNDRV_TIMER_EVENT_MSTART ||
 969             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 970             event == SNDRV_TIMER_EVENT_MRESUME) {
 971                 if (timer->hw.c_resolution)
 972                         resolution = timer->hw.c_resolution(timer);
 973                 else
 974                         resolution = timer->hw.resolution;
 975         }
 976         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 977                 if (ti->ccallback)
 978                         ti->ccallback(ti, event, tstamp, resolution);
 979                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 980                         if (ts->ccallback)
 981                                 ts->ccallback(ts, event, tstamp, resolution);
 982         }
 983         spin_unlock_irqrestore(&timer->lock, flags);
 984 }
 985
 986 /*
 987  * exported functions for global timers
 988  */
 989 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 990 {
 991         struct snd_timer_id tid;
 992
 993         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 994         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 995         tid.card = -1;
 996         tid.device = device;
 997         tid.subdevice = 0;
 998         return snd_timer_new(NULL, id, &tid, rtimer);
 999 }
1000
1001 int snd_timer_global_free(struct snd_timer *timer)
1002 {
1003         return snd_timer_free(timer);
1004 }
1005
1006 int snd_timer_global_register(struct snd_timer *timer)
1007 {
1008         struct snd_device dev;
1009
1010         memset(&dev, 0, sizeof(dev));
1011         dev.device_data = timer;
1012         return snd_timer_dev_register(&dev);
1013 }
1014
1015 /*
1016  *  System timer
1017  */
1018
1019 struct snd_timer_system_private {
1020         struct timer_list tlist;
1021         unsigned long last_expires;
1022         unsigned long last_jiffies;
1023         unsigned long correction;
1024 };
1025
1026 static void snd_timer_s_function(unsigned long data)
1027 {
1028         struct snd_timer *timer = (struct snd_timer *)data;
1029         struct snd_timer_system_private *priv = timer->private_data;
1030         unsigned long jiff = jiffies;
1031         if (time_after(jiff, priv->last_expires))
1032                 priv->correction += (long)jiff - (long)priv->last_expires;
1033         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1034 }
1035
1036 static int snd_timer_s_start(struct snd_timer * timer)
1037 {
1038         struct snd_timer_system_private *priv;
1039         unsigned long njiff;
1040
1041         priv = (struct snd_timer_system_private *) timer->private_data;
1042         njiff = (priv->last_jiffies = jiffies);
1043         if (priv->correction > timer->sticks - 1) {
1044                 priv->correction -= timer->sticks - 1;
1045                 njiff++;
1046         } else {
1047                 njiff += timer->sticks - priv->correction;
1048                 priv->correction = 0;
1049         }
1050         priv->last_expires = priv->tlist.expires = njiff;
1051         add_timer(&priv->tlist);
1052         return 0;
1053 }
1054
1055 static int snd_timer_s_stop(struct snd_timer * timer)
1056 {
1057         struct snd_timer_system_private *priv;
1058         unsigned long jiff;
1059
1060         priv = (struct snd_timer_system_private *) timer->private_data;
1061         del_timer(&priv->tlist);
1062         jiff = jiffies;
1063         if (time_before(jiff, priv->last_expires))
1064                 timer->sticks = priv->last_expires - jiff;
1065         else
1066                 timer->sticks = 1;
1067         priv->correction = 0;
1068         return 0;
1069 }
1070
1071 static struct snd_timer_hardware snd_timer_system =
1072 {
1073         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1074         .resolution =   1000000000L / HZ,
1075         .ticks =        10000000L,
1076         .start =        snd_timer_s_start,
1077         .stop =         snd_timer_s_stop
1078 };
1079
1080 static void snd_timer_free_system(struct snd_timer *timer)
1081 {
1082         kfree(timer->private_data);
1083 }
1084
1085 static int snd_timer_register_system(void)
1086 {
1087         struct snd_timer *timer;
1088         struct snd_timer_system_private *priv;
1089         int err;
1090
1091         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1092         if (err < 0)
1093                 return err;
1094         strcpy(timer->name, "system timer");
1095         timer->hw = snd_timer_system;
1096         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1097         if (priv == NULL) {
1098                 snd_timer_free(timer);
1099                 return -ENOMEM;
1100         }
1101         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1102         timer->private_data = priv;
1103         timer->private_free = snd_timer_free_system;
1104         return snd_timer_global_register(timer);
1105 }
1106
1107 #ifdef CONFIG_SND_PROC_FS
1108 /*
1109  *  Info interface
1110  */
1111
1112 static void snd_timer_proc_read(struct snd_info_entry *entry,
1113                                 struct snd_info_buffer *buffer)
1114 {
1115         struct snd_timer *timer;
1116         struct snd_timer_instance *ti;
1117
1118         mutex_lock(&register_mutex);
1119         list_for_each_entry(timer, &snd_timer_list, device_list) {
1120                 if (timer->card && timer->card->shutdown)
1121                         continue;
1122                 switch (timer->tmr_class) {
1123                 case SNDRV_TIMER_CLASS_GLOBAL:
1124                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1125                         break;
1126                 case SNDRV_TIMER_CLASS_CARD:
1127                         snd_iprintf(buffer, "C%i-%i: ",
1128                                     timer->card->number, timer->tmr_device);
1129                         break;
1130                 case SNDRV_TIMER_CLASS_PCM:
1131                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1132                                     timer->tmr_device, timer->tmr_subdevice);
1133                         break;
1134                 default:
1135                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1136                                     timer->card ? timer->card->number : -1,
1137                                     timer->tmr_device, timer->tmr_subdevice);
1138                 }
1139                 snd_iprintf(buffer, "%s :", timer->name);
1140                 if (timer->hw.resolution)
1141                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1142                                     timer->hw.resolution / 1000,
1143                                     timer->hw.resolution % 1000,
1144                                     timer->hw.ticks);
1145                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1146                         snd_iprintf(buffer, " SLAVE");
1147                 snd_iprintf(buffer, "\n");
1148                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1149                         snd_iprintf(buffer, "  Client %s : %s\n",
1150                                     ti->owner ? ti->owner : "unknown",
1151                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1152                                                  SNDRV_TIMER_IFLG_RUNNING)
1153                                     ? "running" : "stopped");
1154         }
1155         mutex_unlock(&register_mutex);
1156 }
1157
1158 static struct snd_info_entry *snd_timer_proc_entry;
1159
1160 static void __init snd_timer_proc_init(void)
1161 {
1162         struct snd_info_entry *entry;
1163
1164         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1165         if (entry != NULL) {
1166                 entry->c.text.read = snd_timer_proc_read;
1167                 if (snd_info_register(entry) < 0) {
1168                         snd_info_free_entry(entry);
1169                         entry = NULL;
1170                 }
1171         }
1172         snd_timer_proc_entry = entry;
1173 }
1174
1175 static void __exit snd_timer_proc_done(void)
1176 {
1177         snd_info_free_entry(snd_timer_proc_entry);
1178 }
1179 #else /* !CONFIG_SND_PROC_FS */
1180 #define snd_timer_proc_init()
1181 #define snd_timer_proc_done()
1182 #endif
1183
1184 /*
1185  *  USER SPACE interface
1186  */
1187
1188 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1189                                      unsigned long resolution,
1190                                      unsigned long ticks)
1191 {
1192         struct snd_timer_user *tu = timeri->callback_data;
1193         struct snd_timer_read *r;
1194         int prev;
1195
1196         spin_lock(&tu->qlock);
1197         if (tu->qused > 0) {
1198                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1199                 r = &tu->queue[prev];
1200                 if (r->resolution == resolution) {
1201                         r->ticks += ticks;
1202                         goto __wake;
1203                 }
1204         }
1205         if (tu->qused >= tu->queue_size) {
1206                 tu->overrun++;
1207         } else {
1208                 r = &tu->queue[tu->qtail++];
1209                 tu->qtail %= tu->queue_size;
1210                 r->resolution = resolution;
1211                 r->ticks = ticks;
1212                 tu->qused++;
1213         }
1214       __wake:
1215         spin_unlock(&tu->qlock);
1216         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1217         wake_up(&tu->qchange_sleep);
1218 }
1219
1220 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1221                                             struct snd_timer_tread *tread)
1222 {
1223         if (tu->qused >= tu->queue_size) {
1224                 tu->overrun++;
1225         } else {
1226                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1227                 tu->qtail %= tu->queue_size;
1228                 tu->qused++;
1229         }
1230 }
1231
1232 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1233                                      int event,
1234                                      struct timespec *tstamp,
1235                                      unsigned long resolution)
1236 {
1237         struct snd_timer_user *tu = timeri->callback_data;
1238         struct snd_timer_tread r1;
1239         unsigned long flags;
1240
1241         if (event >= SNDRV_TIMER_EVENT_START &&
1242             event <= SNDRV_TIMER_EVENT_PAUSE)
1243                 tu->tstamp = *tstamp;
1244         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1245                 return;
1246         r1.event = event;
1247         r1.tstamp = *tstamp;
1248         r1.val = resolution;
1249         spin_lock_irqsave(&tu->qlock, flags);
1250         snd_timer_user_append_to_tqueue(tu, &r1);
1251         spin_unlock_irqrestore(&tu->qlock, flags);
1252         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1253         wake_up(&tu->qchange_sleep);
1254 }
1255
1256 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1257                                       unsigned long resolution,
1258                                       unsigned long ticks)
1259 {
1260         struct snd_timer_user *tu = timeri->callback_data;
1261         struct snd_timer_tread *r, r1;
1262         struct timespec tstamp;
1263         int prev, append = 0;
1264
1265         memset(&tstamp, 0, sizeof(tstamp));
1266         spin_lock(&tu->qlock);
1267         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1268                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1269                 spin_unlock(&tu->qlock);
1270                 return;
1271         }
1272         if (tu->last_resolution != resolution || ticks > 0) {
1273                 if (timer_tstamp_monotonic)
1274                         ktime_get_ts(&tstamp);
1275                 else
1276                         getnstimeofday(&tstamp);
1277         }
1278         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1279             tu->last_resolution != resolution) {
1280                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1281                 r1.tstamp = tstamp;
1282                 r1.val = resolution;
1283                 snd_timer_user_append_to_tqueue(tu, &r1);
1284                 tu->last_resolution = resolution;
1285                 append++;
1286         }
1287         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1288                 goto __wake;
1289         if (ticks == 0)
1290                 goto __wake;
1291         if (tu->qused > 0) {
1292                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1293                 r = &tu->tqueue[prev];
1294                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1295                         r->tstamp = tstamp;
1296                         r->val += ticks;
1297                         append++;
1298                         goto __wake;
1299                 }
1300         }
1301         r1.event = SNDRV_TIMER_EVENT_TICK;
1302         r1.tstamp = tstamp;
1303         r1.val = ticks;
1304         snd_timer_user_append_to_tqueue(tu, &r1);
1305         append++;
1306       __wake:
1307         spin_unlock(&tu->qlock);
1308         if (append == 0)
1309                 return;
1310         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1311         wake_up(&tu->qchange_sleep);
1312 }
1313
1314 static int snd_timer_user_open(struct inode *inode, struct file *file)
1315 {
1316         struct snd_timer_user *tu;
1317         int err;
1318
1319         err = nonseekable_open(inode, file);
1320         if (err < 0)
1321                 return err;
1322
1323         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1324         if (tu == NULL)
1325                 return -ENOMEM;
1326         spin_lock_init(&tu->qlock);
1327         init_waitqueue_head(&tu->qchange_sleep);
1328         mutex_init(&tu->ioctl_lock);
1329         tu->ticks = 1;
1330         tu->queue_size = 128;
1331         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1332                             GFP_KERNEL);
1333         if (tu->queue == NULL) {
1334                 kfree(tu);
1335                 return -ENOMEM;
1336         }
1337         file->private_data = tu;
1338         return 0;
1339 }
1340
1341 static int snd_timer_user_release(struct inode *inode, struct file *file)
1342 {
1343         struct snd_timer_user *tu;
1344
1345         if (file->private_data) {
1346                 tu = file->private_data;
1347                 file->private_data = NULL;
1348                 mutex_lock(&tu->ioctl_lock);
1349                 if (tu->timeri)
1350                         snd_timer_close(tu->timeri);
1351                 mutex_unlock(&tu->ioctl_lock);
1352                 kfree(tu->queue);
1353                 kfree(tu->tqueue);
1354                 kfree(tu);
1355         }
1356         return 0;
1357 }
1358
1359 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1360 {
1361         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1362         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1363         id->card = -1;
1364         id->device = -1;
1365         id->subdevice = -1;
1366 }
1367
1368 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1369 {
1370         id->dev_class = timer->tmr_class;
1371         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1372         id->card = timer->card ? timer->card->number : -1;
1373         id->device = timer->tmr_device;
1374         id->subdevice = timer->tmr_subdevice;
1375 }
1376
1377 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1378 {
1379         struct snd_timer_id id;
1380         struct snd_timer *timer;
1381         struct list_head *p;
1382
1383         if (copy_from_user(&id, _tid, sizeof(id)))
1384                 return -EFAULT;
1385         mutex_lock(&register_mutex);
1386         if (id.dev_class < 0) {         /* first item */
1387                 if (list_empty(&snd_timer_list))
1388                         snd_timer_user_zero_id(&id);
1389                 else {
1390                         timer = list_entry(snd_timer_list.next,
1391                                            struct snd_timer, device_list);
1392                         snd_timer_user_copy_id(&id, timer);
1393                 }
1394         } else {
1395                 switch (id.dev_class) {
1396                 case SNDRV_TIMER_CLASS_GLOBAL:
1397                         id.device = id.device < 0 ? 0 : id.device + 1;
1398                         list_for_each(p, &snd_timer_list) {
1399                                 timer = list_entry(p, struct snd_timer, device_list);
1400                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1401                                         snd_timer_user_copy_id(&id, timer);
1402                                         break;
1403                                 }
1404                                 if (timer->tmr_device >= id.device) {
1405                                         snd_timer_user_copy_id(&id, timer);
1406                                         break;
1407                                 }
1408                         }
1409                         if (p == &snd_timer_list)
1410                                 snd_timer_user_zero_id(&id);
1411                         break;
1412                 case SNDRV_TIMER_CLASS_CARD:
1413                 case SNDRV_TIMER_CLASS_PCM:
1414                         if (id.card < 0) {
1415                                 id.card = 0;
1416                         } else {
1417                                 if (id.card < 0) {
1418                                         id.card = 0;
1419                                 } else {
1420                                         if (id.device < 0) {
1421                                                 id.device = 0;
1422                                         } else {
1423                                                 if (id.subdevice < 0) {
1424                                                         id.subdevice = 0;
1425                                                 } else {
1426                                                         id.subdevice++;
1427                                                 }
1428                                         }
1429                                 }
1430                         }
1431                         list_for_each(p, &snd_timer_list) {
1432                                 timer = list_entry(p, struct snd_timer, device_list);
1433                                 if (timer->tmr_class > id.dev_class) {
1434                                         snd_timer_user_copy_id(&id, timer);
1435                                         break;
1436                                 }
1437                                 if (timer->tmr_class < id.dev_class)
1438                                         continue;
1439                                 if (timer->card->number > id.card) {
1440                                         snd_timer_user_copy_id(&id, timer);
1441                                         break;
1442                                 }
1443                                 if (timer->card->number < id.card)
1444                                         continue;
1445                                 if (timer->tmr_device > id.device) {
1446                                         snd_timer_user_copy_id(&id, timer);
1447                                         break;
1448                                 }
1449                                 if (timer->tmr_device < id.device)
1450                                         continue;
1451                                 if (timer->tmr_subdevice > id.subdevice) {
1452                                         snd_timer_user_copy_id(&id, timer);
1453                                         break;
1454                                 }
1455                                 if (timer->tmr_subdevice < id.subdevice)
1456                                         continue;
1457                                 snd_timer_user_copy_id(&id, timer);
1458                                 break;
1459                         }
1460                         if (p == &snd_timer_list)
1461                                 snd_timer_user_zero_id(&id);
1462                         break;
1463                 default:
1464                         snd_timer_user_zero_id(&id);
1465                 }
1466         }
1467         mutex_unlock(&register_mutex);
1468         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1469                 return -EFAULT;
1470         return 0;
1471 }
1472
1473 static int snd_timer_user_ginfo(struct file *file,
1474                                 struct snd_timer_ginfo __user *_ginfo)
1475 {
1476         struct snd_timer_ginfo *ginfo;
1477         struct snd_timer_id tid;
1478         struct snd_timer *t;
1479         struct list_head *p;
1480         int err = 0;
1481
1482         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1483         if (IS_ERR(ginfo))
1484                 return PTR_ERR(ginfo);
1485
1486         tid = ginfo->tid;
1487         memset(ginfo, 0, sizeof(*ginfo));
1488         ginfo->tid = tid;
1489         mutex_lock(&register_mutex);
1490         t = snd_timer_find(&tid);
1491         if (t != NULL) {
1492                 ginfo->card = t->card ? t->card->number : -1;
1493                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1494                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1495                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1496                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1497                 ginfo->resolution = t->hw.resolution;
1498                 if (t->hw.resolution_min > 0) {
1499                         ginfo->resolution_min = t->hw.resolution_min;
1500                         ginfo->resolution_max = t->hw.resolution_max;
1501                 }
1502                 list_for_each(p, &t->open_list_head) {
1503                         ginfo->clients++;
1504                 }
1505         } else {
1506                 err = -ENODEV;
1507         }
1508         mutex_unlock(&register_mutex);
1509         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1510                 err = -EFAULT;
1511         kfree(ginfo);
1512         return err;
1513 }
1514
1515 static int snd_timer_user_gparams(struct file *file,
1516                                   struct snd_timer_gparams __user *_gparams)
1517 {
1518         struct snd_timer_gparams gparams;
1519         struct snd_timer *t;
1520         int err;
1521
1522         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1523                 return -EFAULT;
1524         mutex_lock(&register_mutex);
1525         t = snd_timer_find(&gparams.tid);
1526         if (!t) {
1527                 err = -ENODEV;
1528                 goto _error;
1529         }
1530         if (!list_empty(&t->open_list_head)) {
1531                 err = -EBUSY;
1532                 goto _error;
1533         }
1534         if (!t->hw.set_period) {
1535                 err = -ENOSYS;
1536                 goto _error;
1537         }
1538         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1539 _error:
1540         mutex_unlock(&register_mutex);
1541         return err;
1542 }
1543
1544 static int snd_timer_user_gstatus(struct file *file,
1545                                   struct snd_timer_gstatus __user *_gstatus)
1546 {
1547         struct snd_timer_gstatus gstatus;
1548         struct snd_timer_id tid;
1549         struct snd_timer *t;
1550         int err = 0;
1551
1552         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1553                 return -EFAULT;
1554         tid = gstatus.tid;
1555         memset(&gstatus, 0, sizeof(gstatus));
1556         gstatus.tid = tid;
1557         mutex_lock(&register_mutex);
1558         t = snd_timer_find(&tid);
1559         if (t != NULL) {
1560                 if (t->hw.c_resolution)
1561                         gstatus.resolution = t->hw.c_resolution(t);
1562                 else
1563                         gstatus.resolution = t->hw.resolution;
1564                 if (t->hw.precise_resolution) {
1565                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1566                                                  &gstatus.resolution_den);
1567                 } else {
1568                         gstatus.resolution_num = gstatus.resolution;
1569                         gstatus.resolution_den = 1000000000uL;
1570                 }
1571         } else {
1572                 err = -ENODEV;
1573         }
1574         mutex_unlock(&register_mutex);
1575         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1576                 err = -EFAULT;
1577         return err;
1578 }
1579
1580 static int snd_timer_user_tselect(struct file *file,
1581                                   struct snd_timer_select __user *_tselect)
1582 {
1583         struct snd_timer_user *tu;
1584         struct snd_timer_select tselect;
1585         char str[32];
1586         int err = 0;
1587
1588         tu = file->private_data;
1589         if (tu->timeri) {
1590                 snd_timer_close(tu->timeri);
1591                 tu->timeri = NULL;
1592         }
1593         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1594                 err = -EFAULT;
1595                 goto __err;
1596         }
1597         sprintf(str, "application %i", current->pid);
1598         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1599                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1600         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1601         if (err < 0)
1602                 goto __err;
1603
1604         kfree(tu->queue);
1605         tu->queue = NULL;
1606         kfree(tu->tqueue);
1607         tu->tqueue = NULL;
1608         if (tu->tread) {
1609                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1610                                      GFP_KERNEL);
1611                 if (tu->tqueue == NULL)
1612                         err = -ENOMEM;
1613         } else {
1614                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1615                                     GFP_KERNEL);
1616                 if (tu->queue == NULL)
1617                         err = -ENOMEM;
1618         }
1619
1620         if (err < 0) {
1621                 snd_timer_close(tu->timeri);
1622                 tu->timeri = NULL;
1623         } else {
1624                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1625                 tu->timeri->callback = tu->tread
1626                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1627                 tu->timeri->ccallback = snd_timer_user_ccallback;
1628                 tu->timeri->callback_data = (void *)tu;
1629         }
1630
1631       __err:
1632         return err;
1633 }
1634
1635 static int snd_timer_user_info(struct file *file,
1636                                struct snd_timer_info __user *_info)
1637 {
1638         struct snd_timer_user *tu;
1639         struct snd_timer_info *info;
1640         struct snd_timer *t;
1641         int err = 0;
1642
1643         tu = file->private_data;
1644         if (!tu->timeri)
1645                 return -EBADFD;
1646         t = tu->timeri->timer;
1647         if (!t)
1648                 return -EBADFD;
1649
1650         info = kzalloc(sizeof(*info), GFP_KERNEL);
1651         if (! info)
1652                 return -ENOMEM;
1653         info->card = t->card ? t->card->number : -1;
1654         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1655                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1656         strlcpy(info->id, t->id, sizeof(info->id));
1657         strlcpy(info->name, t->name, sizeof(info->name));
1658         info->resolution = t->hw.resolution;
1659         if (copy_to_user(_info, info, sizeof(*_info)))
1660                 err = -EFAULT;
1661         kfree(info);
1662         return err;
1663 }
1664
1665 static int snd_timer_user_params(struct file *file,
1666                                  struct snd_timer_params __user *_params)
1667 {
1668         struct snd_timer_user *tu;
1669         struct snd_timer_params params;
1670         struct snd_timer *t;
1671         struct snd_timer_read *tr;
1672         struct snd_timer_tread *ttr;
1673         int err;
1674
1675         tu = file->private_data;
1676         if (!tu->timeri)
1677                 return -EBADFD;
1678         t = tu->timeri->timer;
1679         if (!t)
1680                 return -EBADFD;
1681         if (copy_from_user(&params, _params, sizeof(params)))
1682                 return -EFAULT;
1683         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1684                 err = -EINVAL;
1685                 goto _end;
1686         }
1687         if (params.queue_size > 0 &&
1688             (params.queue_size < 32 || params.queue_size > 1024)) {
1689                 err = -EINVAL;
1690                 goto _end;
1691         }
1692         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1693                               (1<<SNDRV_TIMER_EVENT_TICK)|
1694                               (1<<SNDRV_TIMER_EVENT_START)|
1695                               (1<<SNDRV_TIMER_EVENT_STOP)|
1696                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1697                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1698                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1699                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1700                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1701                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1702                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1703                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1704                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1705                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1706                 err = -EINVAL;
1707                 goto _end;
1708         }
1709         snd_timer_stop(tu->timeri);
1710         spin_lock_irq(&t->lock);
1711         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1712                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1713                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1714         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1715                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1716         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1717                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1718         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1719                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1720         spin_unlock_irq(&t->lock);
1721         if (params.queue_size > 0 &&
1722             (unsigned int)tu->queue_size != params.queue_size) {
1723                 if (tu->tread) {
1724                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1725                                       GFP_KERNEL);
1726                         if (ttr) {
1727                                 kfree(tu->tqueue);
1728                                 tu->queue_size = params.queue_size;
1729                                 tu->tqueue = ttr;
1730                         }
1731                 } else {
1732                         tr = kmalloc(params.queue_size * sizeof(*tr),
1733                                      GFP_KERNEL);
1734                         if (tr) {
1735                                 kfree(tu->queue);
1736                                 tu->queue_size = params.queue_size;
1737                                 tu->queue = tr;
1738                         }
1739                 }
1740         }
1741         tu->qhead = tu->qtail = tu->qused = 0;
1742         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1743                 if (tu->tread) {
1744                         struct snd_timer_tread tread;
1745                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1746                         tread.tstamp.tv_sec = 0;
1747                         tread.tstamp.tv_nsec = 0;
1748                         tread.val = 0;
1749                         snd_timer_user_append_to_tqueue(tu, &tread);
1750                 } else {
1751                         struct snd_timer_read *r = &tu->queue[0];
1752                         r->resolution = 0;
1753                         r->ticks = 0;
1754                         tu->qused++;
1755                         tu->qtail++;
1756                 }
1757         }
1758         tu->filter = params.filter;
1759         tu->ticks = params.ticks;
1760         err = 0;
1761  _end:
1762         if (copy_to_user(_params, &params, sizeof(params)))
1763                 return -EFAULT;
1764         return err;
1765 }
1766
1767 static int snd_timer_user_status(struct file *file,
1768                                  struct snd_timer_status __user *_status)
1769 {
1770         struct snd_timer_user *tu;
1771         struct snd_timer_status status;
1772
1773         tu = file->private_data;
1774         if (!tu->timeri)
1775                 return -EBADFD;
1776         memset(&status, 0, sizeof(status));
1777         status.tstamp = tu->tstamp;
1778         status.resolution = snd_timer_resolution(tu->timeri);
1779         status.lost = tu->timeri->lost;
1780         status.overrun = tu->overrun;
1781         spin_lock_irq(&tu->qlock);
1782         status.queue = tu->qused;
1783         spin_unlock_irq(&tu->qlock);
1784         if (copy_to_user(_status, &status, sizeof(status)))
1785                 return -EFAULT;
1786         return 0;
1787 }
1788
1789 static int snd_timer_user_start(struct file *file)
1790 {
1791         int err;
1792         struct snd_timer_user *tu;
1793
1794         tu = file->private_data;
1795         if (!tu->timeri)
1796                 return -EBADFD;
1797         snd_timer_stop(tu->timeri);
1798         tu->timeri->lost = 0;
1799         tu->last_resolution = 0;
1800         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1801 }
1802
1803 static int snd_timer_user_stop(struct file *file)
1804 {
1805         int err;
1806         struct snd_timer_user *tu;
1807
1808         tu = file->private_data;
1809         if (!tu->timeri)
1810                 return -EBADFD;
1811         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1812 }
1813
1814 static int snd_timer_user_continue(struct file *file)
1815 {
1816         int err;
1817         struct snd_timer_user *tu;
1818
1819         tu = file->private_data;
1820         if (!tu->timeri)
1821                 return -EBADFD;
1822         tu->timeri->lost = 0;
1823         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1824 }
1825
1826 static int snd_timer_user_pause(struct file *file)
1827 {
1828         int err;
1829         struct snd_timer_user *tu;
1830
1831         tu = file->private_data;
1832         if (!tu->timeri)
1833                 return -EBADFD;
1834         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1835 }
1836
1837 enum {
1838         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1839         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1840         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1841         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1842 };
1843
1844 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1845                                  unsigned long arg)
1846 {
1847         struct snd_timer_user *tu;
1848         void __user *argp = (void __user *)arg;
1849         int __user *p = argp;
1850
1851         tu = file->private_data;
1852         switch (cmd) {
1853         case SNDRV_TIMER_IOCTL_PVERSION:
1854                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1855         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1856                 return snd_timer_user_next_device(argp);
1857         case SNDRV_TIMER_IOCTL_TREAD:
1858         {
1859                 int xarg;
1860
1861                 if (tu->timeri) /* too late */
1862                         return -EBUSY;
1863                 if (get_user(xarg, p))
1864                         return -EFAULT;
1865                 tu->tread = xarg ? 1 : 0;
1866                 return 0;
1867         }
1868         case SNDRV_TIMER_IOCTL_GINFO:
1869                 return snd_timer_user_ginfo(file, argp);
1870         case SNDRV_TIMER_IOCTL_GPARAMS:
1871                 return snd_timer_user_gparams(file, argp);
1872         case SNDRV_TIMER_IOCTL_GSTATUS:
1873                 return snd_timer_user_gstatus(file, argp);
1874         case SNDRV_TIMER_IOCTL_SELECT:
1875                 return snd_timer_user_tselect(file, argp);
1876         case SNDRV_TIMER_IOCTL_INFO:
1877                 return snd_timer_user_info(file, argp);
1878         case SNDRV_TIMER_IOCTL_PARAMS:
1879                 return snd_timer_user_params(file, argp);
1880         case SNDRV_TIMER_IOCTL_STATUS:
1881                 return snd_timer_user_status(file, argp);
1882         case SNDRV_TIMER_IOCTL_START:
1883         case SNDRV_TIMER_IOCTL_START_OLD:
1884                 return snd_timer_user_start(file);
1885         case SNDRV_TIMER_IOCTL_STOP:
1886         case SNDRV_TIMER_IOCTL_STOP_OLD:
1887                 return snd_timer_user_stop(file);
1888         case SNDRV_TIMER_IOCTL_CONTINUE:
1889         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1890                 return snd_timer_user_continue(file);
1891         case SNDRV_TIMER_IOCTL_PAUSE:
1892         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1893                 return snd_timer_user_pause(file);
1894         }
1895         return -ENOTTY;
1896 }
1897
1898 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1899                                  unsigned long arg)
1900 {
1901         struct snd_timer_user *tu = file->private_data;
1902         long ret;
1903
1904         mutex_lock(&tu->ioctl_lock);
1905         ret = __snd_timer_user_ioctl(file, cmd, arg);
1906         mutex_unlock(&tu->ioctl_lock);
1907         return ret;
1908 }
1909
1910 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1911 {
1912         struct snd_timer_user *tu;
1913
1914         tu = file->private_data;
1915         return fasync_helper(fd, file, on, &tu->fasync);
1916 }
1917
1918 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1919                                    size_t count, loff_t *offset)
1920 {
1921         struct snd_timer_user *tu;
1922         long result = 0, unit;
1923         int qhead;
1924         int err = 0;
1925
1926         tu = file->private_data;
1927         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1928         spin_lock_irq(&tu->qlock);
1929         while ((long)count - result >= unit) {
1930                 while (!tu->qused) {
1931                         wait_queue_t wait;
1932
1933                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1934                                 err = -EAGAIN;
1935                                 goto _error;
1936                         }
1937
1938                         set_current_state(TASK_INTERRUPTIBLE);
1939                         init_waitqueue_entry(&wait, current);
1940                         add_wait_queue(&tu->qchange_sleep, &wait);
1941
1942                         spin_unlock_irq(&tu->qlock);
1943                         schedule();
1944                         spin_lock_irq(&tu->qlock);
1945
1946                         remove_wait_queue(&tu->qchange_sleep, &wait);
1947
1948                         if (tu->disconnected) {
1949                                 err = -ENODEV;
1950                                 goto _error;
1951                         }
1952                         if (signal_pending(current)) {
1953                                 err = -ERESTARTSYS;
1954                                 goto _error;
1955                         }
1956                 }
1957
1958                 qhead = tu->qhead++;
1959                 tu->qhead %= tu->queue_size;
1960                 spin_unlock_irq(&tu->qlock);
1961
1962                 if (tu->tread) {
1963                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1964                                          sizeof(struct snd_timer_tread)))
1965                                 err = -EFAULT;
1966                 } else {
1967                         if (copy_to_user(buffer, &tu->queue[qhead],
1968                                          sizeof(struct snd_timer_read)))
1969                                 err = -EFAULT;
1970                 }
1971
1972                 spin_lock_irq(&tu->qlock);
1973                 tu->qused--;
1974                 if (err < 0)
1975                         goto _error;
1976                 result += unit;
1977                 buffer += unit;
1978         }
1979  _error:
1980         spin_unlock_irq(&tu->qlock);
1981         return result > 0 ? result : err;
1982 }
1983
1984 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1985 {
1986         unsigned int mask;
1987         struct snd_timer_user *tu;
1988
1989         tu = file->private_data;
1990
1991         poll_wait(file, &tu->qchange_sleep, wait);
1992
1993         mask = 0;
1994         if (tu->qused)
1995                 mask |= POLLIN | POLLRDNORM;
1996         if (tu->disconnected)
1997                 mask |= POLLERR;
1998
1999         return mask;
2000 }
2001
2002 #ifdef CONFIG_COMPAT
2003 #include "timer_compat.c"
2004 #else
2005 #define snd_timer_user_ioctl_compat     NULL
2006 #endif
2007
2008 static const struct file_operations snd_timer_f_ops =
2009 {
2010         .owner =        THIS_MODULE,
2011         .read =         snd_timer_user_read,
2012         .open =         snd_timer_user_open,
2013         .release =      snd_timer_user_release,
2014         .llseek =       no_llseek,
2015         .poll =         snd_timer_user_poll,
2016         .unlocked_ioctl =       snd_timer_user_ioctl,
2017         .compat_ioctl = snd_timer_user_ioctl_compat,
2018         .fasync =       snd_timer_user_fasync,
2019 };
2020
2021 /* unregister the system timer */
2022 static void snd_timer_free_all(void)
2023 {
2024         struct snd_timer *timer, *n;
2025
2026         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2027                 snd_timer_free(timer);
2028 }
2029
2030 static struct device timer_dev;
2031
2032 /*
2033  *  ENTRY functions
2034  */
2035
2036 static int __init alsa_timer_init(void)
2037 {
2038         int err;
2039
2040         snd_device_initialize(&timer_dev, NULL);
2041         dev_set_name(&timer_dev, "timer");
2042
2043 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2044         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2045                               "system timer");
2046 #endif
2047
2048         err = snd_timer_register_system();
2049         if (err < 0) {
2050                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2051                 put_device(&timer_dev);
2052                 return err;
2053         }
2054
2055         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2056                                   &snd_timer_f_ops, NULL, &timer_dev);
2057         if (err < 0) {
2058                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2059                 snd_timer_free_all();
2060                 put_device(&timer_dev);
2061                 return err;
2062         }
2063
2064         snd_timer_proc_init();
2065         return 0;
2066 }
2067
2068 static void __exit alsa_timer_exit(void)
2069 {
2070         snd_unregister_device(&timer_dev);
2071         snd_timer_free_all();
2072         put_device(&timer_dev);
2073         snd_timer_proc_done();
2074 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2075         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2076 #endif
2077 }
2078
2079 module_init(alsa_timer_init)
2080 module_exit(alsa_timer_exit)
2081
2082 EXPORT_SYMBOL(snd_timer_open);
2083 EXPORT_SYMBOL(snd_timer_close);
2084 EXPORT_SYMBOL(snd_timer_resolution);
2085 EXPORT_SYMBOL(snd_timer_start);
2086 EXPORT_SYMBOL(snd_timer_stop);
2087 EXPORT_SYMBOL(snd_timer_continue);
2088 EXPORT_SYMBOL(snd_timer_pause);
2089 EXPORT_SYMBOL(snd_timer_new);
2090 EXPORT_SYMBOL(snd_timer_notify);
2091 EXPORT_SYMBOL(snd_timer_global_new);
2092 EXPORT_SYMBOL(snd_timer_global_free);
2093 EXPORT_SYMBOL(snd_timer_global_register);
2094 EXPORT_SYMBOL(snd_timer_interrupt);