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/moduleparam.h>
  28 #include <linux/string.h>
  29 #include <sound/core.h>
  30 #include <sound/timer.h>
  31 #include <sound/control.h>
  32 #include <sound/info.h>
  33 #include <sound/minors.h>
  34 #include <sound/initval.h>
  35 #include <linux/kmod.h>
  36
  37 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
  38 #define DEFAULT_TIMER_LIMIT 4
  39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
  40 #define DEFAULT_TIMER_LIMIT 2
  41 #else
  42 #define DEFAULT_TIMER_LIMIT 1
  43 #endif
  44
  45 static int timer_limit = DEFAULT_TIMER_LIMIT;
  46 static int timer_tstamp_monotonic = 1;
  47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  48 MODULE_DESCRIPTION("ALSA timer interface");
  49 MODULE_LICENSE("GPL");
  50 module_param(timer_limit, int, 0444);
  51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  52 module_param(timer_tstamp_monotonic, int, 0444);
  53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  54
  55 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  56 MODULE_ALIAS("devname:snd/timer");
  57
  58 struct snd_timer_user {
  59         struct snd_timer_instance *timeri;
  60         int tread;              /* enhanced read with timestamps and events */
  61         unsigned long ticks;
  62         unsigned long overrun;
  63         int qhead;
  64         int qtail;
  65         int qused;
  66         int queue_size;
  67         struct snd_timer_read *queue;
  68         struct snd_timer_tread *tqueue;
  69         spinlock_t qlock;
  70         unsigned long last_resolution;
  71         unsigned int filter;
  72         struct timespec tstamp;         /* trigger tstamp */
  73         wait_queue_head_t qchange_sleep;
  74         struct fasync_struct *fasync;
  75         struct mutex tread_sem;
  76 };
  77
  78 /* list of timers */
  79 static LIST_HEAD(snd_timer_list);
  80
  81 /* list of slave instances */
  82 static LIST_HEAD(snd_timer_slave_list);
  83
  84 /* lock for slave active lists */
  85 static DEFINE_SPINLOCK(slave_active_lock);
  86
  87 static DEFINE_MUTEX(register_mutex);
  88
  89 static int snd_timer_free(struct snd_timer *timer);
  90 static int snd_timer_dev_free(struct snd_device *device);
  91 static int snd_timer_dev_register(struct snd_device *device);
  92 static int snd_timer_dev_disconnect(struct snd_device *device);
  93
  94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
  95
  96 /*
  97  * create a timer instance with the given owner string.
  98  * when timer is not NULL, increments the module counter
  99  */
 100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 101                                                          struct snd_timer *timer)
 102 {
 103         struct snd_timer_instance *timeri;
 104         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 105         if (timeri == NULL)
 106                 return NULL;
 107         timeri->owner = kstrdup(owner, GFP_KERNEL);
 108         if (! timeri->owner) {
 109                 kfree(timeri);
 110                 return NULL;
 111         }
 112         INIT_LIST_HEAD(&timeri->open_list);
 113         INIT_LIST_HEAD(&timeri->active_list);
 114         INIT_LIST_HEAD(&timeri->ack_list);
 115         INIT_LIST_HEAD(&timeri->slave_list_head);
 116         INIT_LIST_HEAD(&timeri->slave_active_head);
 117
 118         timeri->timer = timer;
 119         if (timer && !try_module_get(timer->module)) {
 120                 kfree(timeri->owner);
 121                 kfree(timeri);
 122                 return NULL;
 123         }
 124
 125         return timeri;
 126 }
 127
 128 /*
 129  * find a timer instance from the given timer id
 130  */
 131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 132 {
 133         struct snd_timer *timer = NULL;
 134
 135         list_for_each_entry(timer, &snd_timer_list, device_list) {
 136                 if (timer->tmr_class != tid->dev_class)
 137                         continue;
 138                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 139                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 140                     (timer->card == NULL ||
 141                      timer->card->number != tid->card))
 142                         continue;
 143                 if (timer->tmr_device != tid->device)
 144                         continue;
 145                 if (timer->tmr_subdevice != tid->subdevice)
 146                         continue;
 147                 return timer;
 148         }
 149         return NULL;
 150 }
 151
 152 #ifdef CONFIG_MODULES
 153
 154 static void snd_timer_request(struct snd_timer_id *tid)
 155 {
 156         switch (tid->dev_class) {
 157         case SNDRV_TIMER_CLASS_GLOBAL:
 158                 if (tid->device < timer_limit)
 159                         request_module("snd-timer-%i", tid->device);
 160                 break;
 161         case SNDRV_TIMER_CLASS_CARD:
 162         case SNDRV_TIMER_CLASS_PCM:
 163                 if (tid->card < snd_ecards_limit)
 164                         request_module("snd-card-%i", tid->card);
 165                 break;
 166         default:
 167                 break;
 168         }
 169 }
 170
 171 #endif
 172
 173 /*
 174  * look for a master instance matching with the slave id of the given slave.
 175  * when found, relink the open_link of the slave.
 176  *
 177  * call this with register_mutex down.
 178  */
 179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
 180 {
 181         struct snd_timer *timer;
 182         struct snd_timer_instance *master;
 183
 184         /* FIXME: it's really dumb to look up all entries.. */
 185         list_for_each_entry(timer, &snd_timer_list, device_list) {
 186                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 187                         if (slave->slave_class == master->slave_class &&
 188                             slave->slave_id == master->slave_id) {
 189                                 list_del(&slave->open_list);
 190                                 list_add_tail(&slave->open_list,
 191                                               &master->slave_list_head);
 192                                 spin_lock_irq(&slave_active_lock);
 193                                 slave->master = master;
 194                                 slave->timer = master->timer;
 195                                 spin_unlock_irq(&slave_active_lock);
 196                                 return;
 197                         }
 198                 }
 199         }
 200 }
 201
 202 /*
 203  * look for slave instances matching with the slave id of the given master.
 204  * when found, relink the open_link of slaves.
 205  *
 206  * call this with register_mutex down.
 207  */
 208 static void snd_timer_check_master(struct snd_timer_instance *master)
 209 {
 210         struct snd_timer_instance *slave, *tmp;
 211
 212         /* check all pending slaves */
 213         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 214                 if (slave->slave_class == master->slave_class &&
 215                     slave->slave_id == master->slave_id) {
 216                         list_move_tail(&slave->open_list, &master->slave_list_head);
 217                         spin_lock_irq(&slave_active_lock);
 218                         slave->master = master;
 219                         slave->timer = master->timer;
 220                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 221                                 list_add_tail(&slave->active_list,
 222                                               &master->slave_active_head);
 223                         spin_unlock_irq(&slave_active_lock);
 224                 }
 225         }
 226 }
 227
 228 /*
 229  * open a timer instance
 230  * when opening a master, the slave id must be here given.
 231  */
 232 int snd_timer_open(struct snd_timer_instance **ti,
 233                    char *owner, struct snd_timer_id *tid,
 234                    unsigned int slave_id)
 235 {
 236         struct snd_timer *timer;
 237         struct snd_timer_instance *timeri = NULL;
 238
 239         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 240                 /* open a slave instance */
 241                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 242                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 243                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
 244                         return -EINVAL;
 245                 }
 246                 mutex_lock(&register_mutex);
 247                 timeri = snd_timer_instance_new(owner, NULL);
 248                 if (!timeri) {
 249                         mutex_unlock(&register_mutex);
 250                         return -ENOMEM;
 251                 }
 252                 timeri->slave_class = tid->dev_sclass;
 253                 timeri->slave_id = tid->device;
 254                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 255                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 256                 snd_timer_check_slave(timeri);
 257                 mutex_unlock(&register_mutex);
 258                 *ti = timeri;
 259                 return 0;
 260         }
 261
 262         /* open a master instance */
 263         mutex_lock(&register_mutex);
 264         timer = snd_timer_find(tid);
 265 #ifdef CONFIG_MODULES
 266         if (!timer) {
 267                 mutex_unlock(&register_mutex);
 268                 snd_timer_request(tid);
 269                 mutex_lock(&register_mutex);
 270                 timer = snd_timer_find(tid);
 271         }
 272 #endif
 273         if (!timer) {
 274                 mutex_unlock(&register_mutex);
 275                 return -ENODEV;
 276         }
 277         if (!list_empty(&timer->open_list_head)) {
 278                 timeri = list_entry(timer->open_list_head.next,
 279                                     struct snd_timer_instance, open_list);
 280                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 281                         mutex_unlock(&register_mutex);
 282                         return -EBUSY;
 283                 }
 284         }
 285         timeri = snd_timer_instance_new(owner, timer);
 286         if (!timeri) {
 287                 mutex_unlock(&register_mutex);
 288                 return -ENOMEM;
 289         }
 290         timeri->slave_class = tid->dev_sclass;
 291         timeri->slave_id = slave_id;
 292         if (list_empty(&timer->open_list_head) && timer->hw.open)
 293                 timer->hw.open(timer);
 294         list_add_tail(&timeri->open_list, &timer->open_list_head);
 295         snd_timer_check_master(timeri);
 296         mutex_unlock(&register_mutex);
 297         *ti = timeri;
 298         return 0;
 299 }
 300
 301 static int _snd_timer_stop(struct snd_timer_instance *timeri,
 302                            int keep_flag, int event);
 303
 304 /*
 305  * close a timer instance
 306  */
 307 int snd_timer_close(struct snd_timer_instance *timeri)
 308 {
 309         struct snd_timer *timer = NULL;
 310         struct snd_timer_instance *slave, *tmp;
 311
 312         if (snd_BUG_ON(!timeri))
 313                 return -ENXIO;
 314
 315         /* force to stop the timer */
 316         snd_timer_stop(timeri);
 317
 318         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 319                 /* wait, until the active callback is finished */
 320                 spin_lock_irq(&slave_active_lock);
 321                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 322                         spin_unlock_irq(&slave_active_lock);
 323                         udelay(10);
 324                         spin_lock_irq(&slave_active_lock);
 325                 }
 326                 spin_unlock_irq(&slave_active_lock);
 327                 mutex_lock(&register_mutex);
 328                 list_del(&timeri->open_list);
 329                 mutex_unlock(&register_mutex);
 330         } else {
 331                 timer = timeri->timer;
 332                 /* wait, until the active callback is finished */
 333                 spin_lock_irq(&timer->lock);
 334                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 335                         spin_unlock_irq(&timer->lock);
 336                         udelay(10);
 337                         spin_lock_irq(&timer->lock);
 338                 }
 339                 spin_unlock_irq(&timer->lock);
 340                 mutex_lock(&register_mutex);
 341                 list_del(&timeri->open_list);
 342                 if (timer && list_empty(&timer->open_list_head) &&
 343                     timer->hw.close)
 344                         timer->hw.close(timer);
 345                 /* remove slave links */
 346                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 347                                          open_list) {
 348                         spin_lock_irq(&slave_active_lock);
 349                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
 350                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 351                         slave->master = NULL;
 352                         slave->timer = NULL;
 353                         spin_unlock_irq(&slave_active_lock);
 354                 }
 355                 mutex_unlock(&register_mutex);
 356         }
 357         if (timeri->private_free)
 358                 timeri->private_free(timeri);
 359         kfree(timeri->owner);
 360         kfree(timeri);
 361         if (timer)
 362                 module_put(timer->module);
 363         return 0;
 364 }
 365
 366 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 367 {
 368         struct snd_timer * timer;
 369
 370         if (timeri == NULL)
 371                 return 0;
 372         if ((timer = timeri->timer) != NULL) {
 373                 if (timer->hw.c_resolution)
 374                         return timer->hw.c_resolution(timer);
 375                 return timer->hw.resolution;
 376         }
 377         return 0;
 378 }
 379
 380 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 381 {
 382         struct snd_timer *timer;
 383         unsigned long flags;
 384         unsigned long resolution = 0;
 385         struct snd_timer_instance *ts;
 386         struct timespec tstamp;
 387
 388         if (timer_tstamp_monotonic)
 389                 do_posix_clock_monotonic_gettime(&tstamp);
 390         else
 391                 getnstimeofday(&tstamp);
 392         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 393                        event > SNDRV_TIMER_EVENT_PAUSE))
 394                 return;
 395         if (event == SNDRV_TIMER_EVENT_START ||
 396             event == SNDRV_TIMER_EVENT_CONTINUE)
 397                 resolution = snd_timer_resolution(ti);
 398         if (ti->ccallback)
 399                 ti->ccallback(ti, event, &tstamp, resolution);
 400         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 401                 return;
 402         timer = ti->timer;
 403         if (timer == NULL)
 404                 return;
 405         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 406                 return;
 407         spin_lock_irqsave(&timer->lock, flags);
 408         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 409                 if (ts->ccallback)
 410                         ts->ccallback(ti, event + 100, &tstamp, resolution);
 411         spin_unlock_irqrestore(&timer->lock, flags);
 412 }
 413
 414 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
 415                             unsigned long sticks)
 416 {
 417         list_del(&timeri->active_list);
 418         list_add_tail(&timeri->active_list, &timer->active_list_head);
 419         if (timer->running) {
 420                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 421                         goto __start_now;
 422                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 423                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 424                 return 1;       /* delayed start */
 425         } else {
 426                 timer->sticks = sticks;
 427                 timer->hw.start(timer);
 428               __start_now:
 429                 timer->running++;
 430                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 431                 return 0;
 432         }
 433 }
 434
 435 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
 436 {
 437         unsigned long flags;
 438
 439         spin_lock_irqsave(&slave_active_lock, flags);
 440         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 441         if (timeri->master)
 442                 list_add_tail(&timeri->active_list,
 443                               &timeri->master->slave_active_head);
 444         spin_unlock_irqrestore(&slave_active_lock, flags);
 445         return 1; /* delayed start */
 446 }
 447
 448 /*
 449  *  start the timer instance
 450  */
 451 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 452 {
 453         struct snd_timer *timer;
 454         int result = -EINVAL;
 455         unsigned long flags;
 456
 457         if (timeri == NULL || ticks < 1)
 458                 return -EINVAL;
 459         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 460                 result = snd_timer_start_slave(timeri);
 461                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 462                 return result;
 463         }
 464         timer = timeri->timer;
 465         if (timer == NULL)
 466                 return -EINVAL;
 467         spin_lock_irqsave(&timer->lock, flags);
 468         timeri->ticks = timeri->cticks = ticks;
 469         timeri->pticks = 0;
 470         result = snd_timer_start1(timer, timeri, ticks);
 471         spin_unlock_irqrestore(&timer->lock, flags);
 472         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 473         return result;
 474 }
 475
 476 static int _snd_timer_stop(struct snd_timer_instance * timeri,
 477                            int keep_flag, int event)
 478 {
 479         struct snd_timer *timer;
 480         unsigned long flags;
 481
 482         if (snd_BUG_ON(!timeri))
 483                 return -ENXIO;
 484
 485         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 486                 if (!keep_flag) {
 487                         spin_lock_irqsave(&slave_active_lock, flags);
 488                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 489                         spin_unlock_irqrestore(&slave_active_lock, flags);
 490                 }
 491                 goto __end;
 492         }
 493         timer = timeri->timer;
 494         if (!timer)
 495                 return -EINVAL;
 496         spin_lock_irqsave(&timer->lock, flags);
 497         list_del_init(&timeri->ack_list);
 498         list_del_init(&timeri->active_list);
 499         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 500             !(--timer->running)) {
 501                 timer->hw.stop(timer);
 502                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 503                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 504                         snd_timer_reschedule(timer, 0);
 505                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 506                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 507                                 timer->hw.start(timer);
 508                         }
 509                 }
 510         }
 511         if (!keep_flag)
 512                 timeri->flags &=
 513                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 514         spin_unlock_irqrestore(&timer->lock, flags);
 515       __end:
 516         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 517                 snd_timer_notify1(timeri, event);
 518         return 0;
 519 }
 520
 521 /*
 522  * stop the timer instance.
 523  *
 524  * do not call this from the timer callback!
 525  */
 526 int snd_timer_stop(struct snd_timer_instance *timeri)
 527 {
 528         struct snd_timer *timer;
 529         unsigned long flags;
 530         int err;
 531
 532         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
 533         if (err < 0)
 534                 return err;
 535         timer = timeri->timer;
 536         spin_lock_irqsave(&timer->lock, flags);
 537         timeri->cticks = timeri->ticks;
 538         timeri->pticks = 0;
 539         spin_unlock_irqrestore(&timer->lock, flags);
 540         return 0;
 541 }
 542
 543 /*
 544  * start again..  the tick is kept.
 545  */
 546 int snd_timer_continue(struct snd_timer_instance *timeri)
 547 {
 548         struct snd_timer *timer;
 549         int result = -EINVAL;
 550         unsigned long flags;
 551
 552         if (timeri == NULL)
 553                 return result;
 554         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 555                 return snd_timer_start_slave(timeri);
 556         timer = timeri->timer;
 557         if (! timer)
 558                 return -EINVAL;
 559         spin_lock_irqsave(&timer->lock, flags);
 560         if (!timeri->cticks)
 561                 timeri->cticks = 1;
 562         timeri->pticks = 0;
 563         result = snd_timer_start1(timer, timeri, timer->sticks);
 564         spin_unlock_irqrestore(&timer->lock, flags);
 565         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
 566         return result;
 567 }
 568
 569 /*
 570  * pause.. remember the ticks left
 571  */
 572 int snd_timer_pause(struct snd_timer_instance * timeri)
 573 {
 574         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
 575 }
 576
 577 /*
 578  * reschedule the timer
 579  *
 580  * start pending instances and check the scheduling ticks.
 581  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 582  */
 583 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 584 {
 585         struct snd_timer_instance *ti;
 586         unsigned long ticks = ~0UL;
 587
 588         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 589                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 590                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 591                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 592                         timer->running++;
 593                 }
 594                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 595                         if (ticks > ti->cticks)
 596                                 ticks = ti->cticks;
 597                 }
 598         }
 599         if (ticks == ~0UL) {
 600                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 601                 return;
 602         }
 603         if (ticks > timer->hw.ticks)
 604                 ticks = timer->hw.ticks;
 605         if (ticks_left != ticks)
 606                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 607         timer->sticks = ticks;
 608 }
 609
 610 /*
 611  * timer tasklet
 612  *
 613  */
 614 static void snd_timer_tasklet(unsigned long arg)
 615 {
 616         struct snd_timer *timer = (struct snd_timer *) arg;
 617         struct snd_timer_instance *ti;
 618         struct list_head *p;
 619         unsigned long resolution, ticks;
 620         unsigned long flags;
 621
 622         spin_lock_irqsave(&timer->lock, flags);
 623         /* now process all callbacks */
 624         while (!list_empty(&timer->sack_list_head)) {
 625                 p = timer->sack_list_head.next;         /* get first item */
 626                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 627
 628                 /* remove from ack_list and make empty */
 629                 list_del_init(p);
 630
 631                 ticks = ti->pticks;
 632                 ti->pticks = 0;
 633                 resolution = ti->resolution;
 634
 635                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 636                 spin_unlock(&timer->lock);
 637                 if (ti->callback)
 638                         ti->callback(ti, resolution, ticks);
 639                 spin_lock(&timer->lock);
 640                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 641         }
 642         spin_unlock_irqrestore(&timer->lock, flags);
 643 }
 644
 645 /*
 646  * timer interrupt
 647  *
 648  * ticks_left is usually equal to timer->sticks.
 649  *
 650  */
 651 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 652 {
 653         struct snd_timer_instance *ti, *ts, *tmp;
 654         unsigned long resolution, ticks;
 655         struct list_head *p, *ack_list_head;
 656         unsigned long flags;
 657         int use_tasklet = 0;
 658
 659         if (timer == NULL)
 660                 return;
 661
 662         spin_lock_irqsave(&timer->lock, flags);
 663
 664         /* remember the current resolution */
 665         if (timer->hw.c_resolution)
 666                 resolution = timer->hw.c_resolution(timer);
 667         else
 668                 resolution = timer->hw.resolution;
 669
 670         /* loop for all active instances
 671          * Here we cannot use list_for_each_entry because the active_list of a
 672          * processed instance is relinked to done_list_head before the callback
 673          * is called.
 674          */
 675         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 676                                  active_list) {
 677                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 678                         continue;
 679                 ti->pticks += ticks_left;
 680                 ti->resolution = resolution;
 681                 if (ti->cticks < ticks_left)
 682                         ti->cticks = 0;
 683                 else
 684                         ti->cticks -= ticks_left;
 685                 if (ti->cticks) /* not expired */
 686                         continue;
 687                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 688                         ti->cticks = ti->ticks;
 689                 } else {
 690                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 691                         if (--timer->running)
 692                                 list_del(&ti->active_list);
 693                 }
 694                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 695                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 696                         ack_list_head = &timer->ack_list_head;
 697                 else
 698                         ack_list_head = &timer->sack_list_head;
 699                 if (list_empty(&ti->ack_list))
 700                         list_add_tail(&ti->ack_list, ack_list_head);
 701                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 702                         ts->pticks = ti->pticks;
 703                         ts->resolution = resolution;
 704                         if (list_empty(&ts->ack_list))
 705                                 list_add_tail(&ts->ack_list, ack_list_head);
 706                 }
 707         }
 708         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 709                 snd_timer_reschedule(timer, timer->sticks);
 710         if (timer->running) {
 711                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 712                         timer->hw.stop(timer);
 713                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 714                 }
 715                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 716                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 717                         /* restart timer */
 718                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 719                         timer->hw.start(timer);
 720                 }
 721         } else {
 722                 timer->hw.stop(timer);
 723         }
 724
 725         /* now process all fast callbacks */
 726         while (!list_empty(&timer->ack_list_head)) {
 727                 p = timer->ack_list_head.next;          /* get first item */
 728                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 729
 730                 /* remove from ack_list and make empty */
 731                 list_del_init(p);
 732
 733                 ticks = ti->pticks;
 734                 ti->pticks = 0;
 735
 736                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 737                 spin_unlock(&timer->lock);
 738                 if (ti->callback)
 739                         ti->callback(ti, resolution, ticks);
 740                 spin_lock(&timer->lock);
 741                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 742         }
 743
 744         /* do we have any slow callbacks? */
 745         use_tasklet = !list_empty(&timer->sack_list_head);
 746         spin_unlock_irqrestore(&timer->lock, flags);
 747
 748         if (use_tasklet)
 749                 tasklet_schedule(&timer->task_queue);
 750 }
 751
 752 /*
 753
 754  */
 755
 756 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 757                   struct snd_timer **rtimer)
 758 {
 759         struct snd_timer *timer;
 760         int err;
 761         static struct snd_device_ops ops = {
 762                 .dev_free = snd_timer_dev_free,
 763                 .dev_register = snd_timer_dev_register,
 764                 .dev_disconnect = snd_timer_dev_disconnect,
 765         };
 766
 767         if (snd_BUG_ON(!tid))
 768                 return -EINVAL;
 769         if (rtimer)
 770                 *rtimer = NULL;
 771         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 772         if (timer == NULL) {
 773                 snd_printk(KERN_ERR "timer: cannot allocate\n");
 774                 return -ENOMEM;
 775         }
 776         timer->tmr_class = tid->dev_class;
 777         timer->card = card;
 778         timer->tmr_device = tid->device;
 779         timer->tmr_subdevice = tid->subdevice;
 780         if (id)
 781                 strlcpy(timer->id, id, sizeof(timer->id));
 782         INIT_LIST_HEAD(&timer->device_list);
 783         INIT_LIST_HEAD(&timer->open_list_head);
 784         INIT_LIST_HEAD(&timer->active_list_head);
 785         INIT_LIST_HEAD(&timer->ack_list_head);
 786         INIT_LIST_HEAD(&timer->sack_list_head);
 787         spin_lock_init(&timer->lock);
 788         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 789                      (unsigned long)timer);
 790         if (card != NULL) {
 791                 timer->module = card->module;
 792                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 793                 if (err < 0) {
 794                         snd_timer_free(timer);
 795                         return err;
 796                 }
 797         }
 798         if (rtimer)
 799                 *rtimer = timer;
 800         return 0;
 801 }
 802
 803 static int snd_timer_free(struct snd_timer *timer)
 804 {
 805         if (!timer)
 806                 return 0;
 807
 808         mutex_lock(&register_mutex);
 809         if (! list_empty(&timer->open_list_head)) {
 810                 struct list_head *p, *n;
 811                 struct snd_timer_instance *ti;
 812                 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
 813                 list_for_each_safe(p, n, &timer->open_list_head) {
 814                         list_del_init(p);
 815                         ti = list_entry(p, struct snd_timer_instance, open_list);
 816                         ti->timer = NULL;
 817                 }
 818         }
 819         list_del(&timer->device_list);
 820         mutex_unlock(&register_mutex);
 821
 822         if (timer->private_free)
 823                 timer->private_free(timer);
 824         kfree(timer);
 825         return 0;
 826 }
 827
 828 static int snd_timer_dev_free(struct snd_device *device)
 829 {
 830         struct snd_timer *timer = device->device_data;
 831         return snd_timer_free(timer);
 832 }
 833
 834 static int snd_timer_dev_register(struct snd_device *dev)
 835 {
 836         struct snd_timer *timer = dev->device_data;
 837         struct snd_timer *timer1;
 838
 839         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 840                 return -ENXIO;
 841         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 842             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 843                 return -EINVAL;
 844
 845         mutex_lock(&register_mutex);
 846         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 847                 if (timer1->tmr_class > timer->tmr_class)
 848                         break;
 849                 if (timer1->tmr_class < timer->tmr_class)
 850                         continue;
 851                 if (timer1->card && timer->card) {
 852                         if (timer1->card->number > timer->card->number)
 853                                 break;
 854                         if (timer1->card->number < timer->card->number)
 855                                 continue;
 856                 }
 857                 if (timer1->tmr_device > timer->tmr_device)
 858                         break;
 859                 if (timer1->tmr_device < timer->tmr_device)
 860                         continue;
 861                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 862                         break;
 863                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 864                         continue;
 865                 /* conflicts.. */
 866                 mutex_unlock(&register_mutex);
 867                 return -EBUSY;
 868         }
 869         list_add_tail(&timer->device_list, &timer1->device_list);
 870         mutex_unlock(&register_mutex);
 871         return 0;
 872 }
 873
 874 static int snd_timer_dev_disconnect(struct snd_device *device)
 875 {
 876         struct snd_timer *timer = device->device_data;
 877         mutex_lock(&register_mutex);
 878         list_del_init(&timer->device_list);
 879         mutex_unlock(&register_mutex);
 880         return 0;
 881 }
 882
 883 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
 884 {
 885         unsigned long flags;
 886         unsigned long resolution = 0;
 887         struct snd_timer_instance *ti, *ts;
 888
 889         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
 890                 return;
 891         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
 892                        event > SNDRV_TIMER_EVENT_MRESUME))
 893                 return;
 894         spin_lock_irqsave(&timer->lock, flags);
 895         if (event == SNDRV_TIMER_EVENT_MSTART ||
 896             event == SNDRV_TIMER_EVENT_MCONTINUE ||
 897             event == SNDRV_TIMER_EVENT_MRESUME) {
 898                 if (timer->hw.c_resolution)
 899                         resolution = timer->hw.c_resolution(timer);
 900                 else
 901                         resolution = timer->hw.resolution;
 902         }
 903         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 904                 if (ti->ccallback)
 905                         ti->ccallback(ti, event, tstamp, resolution);
 906                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
 907                         if (ts->ccallback)
 908                                 ts->ccallback(ts, event, tstamp, resolution);
 909         }
 910         spin_unlock_irqrestore(&timer->lock, flags);
 911 }
 912
 913 /*
 914  * exported functions for global timers
 915  */
 916 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
 917 {
 918         struct snd_timer_id tid;
 919
 920         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 921         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 922         tid.card = -1;
 923         tid.device = device;
 924         tid.subdevice = 0;
 925         return snd_timer_new(NULL, id, &tid, rtimer);
 926 }
 927
 928 int snd_timer_global_free(struct snd_timer *timer)
 929 {
 930         return snd_timer_free(timer);
 931 }
 932
 933 int snd_timer_global_register(struct snd_timer *timer)
 934 {
 935         struct snd_device dev;
 936
 937         memset(&dev, 0, sizeof(dev));
 938         dev.device_data = timer;
 939         return snd_timer_dev_register(&dev);
 940 }
 941
 942 /*
 943  *  System timer
 944  */
 945
 946 struct snd_timer_system_private {
 947         struct timer_list tlist;
 948         unsigned long last_expires;
 949         unsigned long last_jiffies;
 950         unsigned long correction;
 951 };
 952
 953 static void snd_timer_s_function(unsigned long data)
 954 {
 955         struct snd_timer *timer = (struct snd_timer *)data;
 956         struct snd_timer_system_private *priv = timer->private_data;
 957         unsigned long jiff = jiffies;
 958         if (time_after(jiff, priv->last_expires))
 959                 priv->correction += (long)jiff - (long)priv->last_expires;
 960         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
 961 }
 962
 963 static int snd_timer_s_start(struct snd_timer * timer)
 964 {
 965         struct snd_timer_system_private *priv;
 966         unsigned long njiff;
 967
 968         priv = (struct snd_timer_system_private *) timer->private_data;
 969         njiff = (priv->last_jiffies = jiffies);
 970         if (priv->correction > timer->sticks - 1) {
 971                 priv->correction -= timer->sticks - 1;
 972                 njiff++;
 973         } else {
 974                 njiff += timer->sticks - priv->correction;
 975                 priv->correction = 0;
 976         }
 977         priv->last_expires = priv->tlist.expires = njiff;
 978         add_timer(&priv->tlist);
 979         return 0;
 980 }
 981
 982 static int snd_timer_s_stop(struct snd_timer * timer)
 983 {
 984         struct snd_timer_system_private *priv;
 985         unsigned long jiff;
 986
 987         priv = (struct snd_timer_system_private *) timer->private_data;
 988         del_timer(&priv->tlist);
 989         jiff = jiffies;
 990         if (time_before(jiff, priv->last_expires))
 991                 timer->sticks = priv->last_expires - jiff;
 992         else
 993                 timer->sticks = 1;
 994         priv->correction = 0;
 995         return 0;
 996 }
 997
 998 static struct snd_timer_hardware snd_timer_system =
 999 {
1000         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1001         .resolution =   1000000000L / HZ,
1002         .ticks =        10000000L,
1003         .start =        snd_timer_s_start,
1004         .stop =         snd_timer_s_stop
1005 };
1006
1007 static void snd_timer_free_system(struct snd_timer *timer)
1008 {
1009         kfree(timer->private_data);
1010 }
1011
1012 static int snd_timer_register_system(void)
1013 {
1014         struct snd_timer *timer;
1015         struct snd_timer_system_private *priv;
1016         int err;
1017
1018         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1019         if (err < 0)
1020                 return err;
1021         strcpy(timer->name, "system timer");
1022         timer->hw = snd_timer_system;
1023         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1024         if (priv == NULL) {
1025                 snd_timer_free(timer);
1026                 return -ENOMEM;
1027         }
1028         init_timer(&priv->tlist);
1029         priv->tlist.function = snd_timer_s_function;
1030         priv->tlist.data = (unsigned long) timer;
1031         timer->private_data = priv;
1032         timer->private_free = snd_timer_free_system;
1033         return snd_timer_global_register(timer);
1034 }
1035
1036 #ifdef CONFIG_PROC_FS
1037 /*
1038  *  Info interface
1039  */
1040
1041 static void snd_timer_proc_read(struct snd_info_entry *entry,
1042                                 struct snd_info_buffer *buffer)
1043 {
1044         struct snd_timer *timer;
1045         struct snd_timer_instance *ti;
1046
1047         mutex_lock(&register_mutex);
1048         list_for_each_entry(timer, &snd_timer_list, device_list) {
1049                 switch (timer->tmr_class) {
1050                 case SNDRV_TIMER_CLASS_GLOBAL:
1051                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1052                         break;
1053                 case SNDRV_TIMER_CLASS_CARD:
1054                         snd_iprintf(buffer, "C%i-%i: ",
1055                                     timer->card->number, timer->tmr_device);
1056                         break;
1057                 case SNDRV_TIMER_CLASS_PCM:
1058                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1059                                     timer->tmr_device, timer->tmr_subdevice);
1060                         break;
1061                 default:
1062                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1063                                     timer->card ? timer->card->number : -1,
1064                                     timer->tmr_device, timer->tmr_subdevice);
1065                 }
1066                 snd_iprintf(buffer, "%s :", timer->name);
1067                 if (timer->hw.resolution)
1068                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1069                                     timer->hw.resolution / 1000,
1070                                     timer->hw.resolution % 1000,
1071                                     timer->hw.ticks);
1072                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1073                         snd_iprintf(buffer, " SLAVE");
1074                 snd_iprintf(buffer, "\n");
1075                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1076                         snd_iprintf(buffer, "  Client %s : %s\n",
1077                                     ti->owner ? ti->owner : "unknown",
1078                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1079                                                  SNDRV_TIMER_IFLG_RUNNING)
1080                                     ? "running" : "stopped");
1081         }
1082         mutex_unlock(&register_mutex);
1083 }
1084
1085 static struct snd_info_entry *snd_timer_proc_entry;
1086
1087 static void __init snd_timer_proc_init(void)
1088 {
1089         struct snd_info_entry *entry;
1090
1091         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1092         if (entry != NULL) {
1093                 entry->c.text.read = snd_timer_proc_read;
1094                 if (snd_info_register(entry) < 0) {
1095                         snd_info_free_entry(entry);
1096                         entry = NULL;
1097                 }
1098         }
1099         snd_timer_proc_entry = entry;
1100 }
1101
1102 static void __exit snd_timer_proc_done(void)
1103 {
1104         snd_info_free_entry(snd_timer_proc_entry);
1105 }
1106 #else /* !CONFIG_PROC_FS */
1107 #define snd_timer_proc_init()
1108 #define snd_timer_proc_done()
1109 #endif
1110
1111 /*
1112  *  USER SPACE interface
1113  */
1114
1115 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1116                                      unsigned long resolution,
1117                                      unsigned long ticks)
1118 {
1119         struct snd_timer_user *tu = timeri->callback_data;
1120         struct snd_timer_read *r;
1121         int prev;
1122
1123         spin_lock(&tu->qlock);
1124         if (tu->qused > 0) {
1125                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1126                 r = &tu->queue[prev];
1127                 if (r->resolution == resolution) {
1128                         r->ticks += ticks;
1129                         goto __wake;
1130                 }
1131         }
1132         if (tu->qused >= tu->queue_size) {
1133                 tu->overrun++;
1134         } else {
1135                 r = &tu->queue[tu->qtail++];
1136                 tu->qtail %= tu->queue_size;
1137                 r->resolution = resolution;
1138                 r->ticks = ticks;
1139                 tu->qused++;
1140         }
1141       __wake:
1142         spin_unlock(&tu->qlock);
1143         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1144         wake_up(&tu->qchange_sleep);
1145 }
1146
1147 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1148                                             struct snd_timer_tread *tread)
1149 {
1150         if (tu->qused >= tu->queue_size) {
1151                 tu->overrun++;
1152         } else {
1153                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1154                 tu->qtail %= tu->queue_size;
1155                 tu->qused++;
1156         }
1157 }
1158
1159 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1160                                      int event,
1161                                      struct timespec *tstamp,
1162                                      unsigned long resolution)
1163 {
1164         struct snd_timer_user *tu = timeri->callback_data;
1165         struct snd_timer_tread r1;
1166         unsigned long flags;
1167
1168         if (event >= SNDRV_TIMER_EVENT_START &&
1169             event <= SNDRV_TIMER_EVENT_PAUSE)
1170                 tu->tstamp = *tstamp;
1171         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1172                 return;
1173         r1.event = event;
1174         r1.tstamp = *tstamp;
1175         r1.val = resolution;
1176         spin_lock_irqsave(&tu->qlock, flags);
1177         snd_timer_user_append_to_tqueue(tu, &r1);
1178         spin_unlock_irqrestore(&tu->qlock, flags);
1179         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1180         wake_up(&tu->qchange_sleep);
1181 }
1182
1183 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1184                                       unsigned long resolution,
1185                                       unsigned long ticks)
1186 {
1187         struct snd_timer_user *tu = timeri->callback_data;
1188         struct snd_timer_tread *r, r1;
1189         struct timespec tstamp;
1190         int prev, append = 0;
1191
1192         memset(&tstamp, 0, sizeof(tstamp));
1193         spin_lock(&tu->qlock);
1194         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1195                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1196                 spin_unlock(&tu->qlock);
1197                 return;
1198         }
1199         if (tu->last_resolution != resolution || ticks > 0) {
1200                 if (timer_tstamp_monotonic)
1201                         do_posix_clock_monotonic_gettime(&tstamp);
1202                 else
1203                         getnstimeofday(&tstamp);
1204         }
1205         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1206             tu->last_resolution != resolution) {
1207                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1208                 r1.tstamp = tstamp;
1209                 r1.val = resolution;
1210                 snd_timer_user_append_to_tqueue(tu, &r1);
1211                 tu->last_resolution = resolution;
1212                 append++;
1213         }
1214         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1215                 goto __wake;
1216         if (ticks == 0)
1217                 goto __wake;
1218         if (tu->qused > 0) {
1219                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1220                 r = &tu->tqueue[prev];
1221                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1222                         r->tstamp = tstamp;
1223                         r->val += ticks;
1224                         append++;
1225                         goto __wake;
1226                 }
1227         }
1228         r1.event = SNDRV_TIMER_EVENT_TICK;
1229         r1.tstamp = tstamp;
1230         r1.val = ticks;
1231         snd_timer_user_append_to_tqueue(tu, &r1);
1232         append++;
1233       __wake:
1234         spin_unlock(&tu->qlock);
1235         if (append == 0)
1236                 return;
1237         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1238         wake_up(&tu->qchange_sleep);
1239 }
1240
1241 static int snd_timer_user_open(struct inode *inode, struct file *file)
1242 {
1243         struct snd_timer_user *tu;
1244         int err;
1245
1246         err = nonseekable_open(inode, file);
1247         if (err < 0)
1248                 return err;
1249
1250         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1251         if (tu == NULL)
1252                 return -ENOMEM;
1253         spin_lock_init(&tu->qlock);
1254         init_waitqueue_head(&tu->qchange_sleep);
1255         mutex_init(&tu->tread_sem);
1256         tu->ticks = 1;
1257         tu->queue_size = 128;
1258         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1259                             GFP_KERNEL);
1260         if (tu->queue == NULL) {
1261                 kfree(tu);
1262                 return -ENOMEM;
1263         }
1264         file->private_data = tu;
1265         return 0;
1266 }
1267
1268 static int snd_timer_user_release(struct inode *inode, struct file *file)
1269 {
1270         struct snd_timer_user *tu;
1271
1272         if (file->private_data) {
1273                 tu = file->private_data;
1274                 file->private_data = NULL;
1275                 if (tu->timeri)
1276                         snd_timer_close(tu->timeri);
1277                 kfree(tu->queue);
1278                 kfree(tu->tqueue);
1279                 kfree(tu);
1280         }
1281         return 0;
1282 }
1283
1284 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1285 {
1286         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1287         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1288         id->card = -1;
1289         id->device = -1;
1290         id->subdevice = -1;
1291 }
1292
1293 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1294 {
1295         id->dev_class = timer->tmr_class;
1296         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1297         id->card = timer->card ? timer->card->number : -1;
1298         id->device = timer->tmr_device;
1299         id->subdevice = timer->tmr_subdevice;
1300 }
1301
1302 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1303 {
1304         struct snd_timer_id id;
1305         struct snd_timer *timer;
1306         struct list_head *p;
1307
1308         if (copy_from_user(&id, _tid, sizeof(id)))
1309                 return -EFAULT;
1310         mutex_lock(&register_mutex);
1311         if (id.dev_class < 0) {         /* first item */
1312                 if (list_empty(&snd_timer_list))
1313                         snd_timer_user_zero_id(&id);
1314                 else {
1315                         timer = list_entry(snd_timer_list.next,
1316                                            struct snd_timer, device_list);
1317                         snd_timer_user_copy_id(&id, timer);
1318                 }
1319         } else {
1320                 switch (id.dev_class) {
1321                 case SNDRV_TIMER_CLASS_GLOBAL:
1322                         id.device = id.device < 0 ? 0 : id.device + 1;
1323                         list_for_each(p, &snd_timer_list) {
1324                                 timer = list_entry(p, struct snd_timer, device_list);
1325                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1326                                         snd_timer_user_copy_id(&id, timer);
1327                                         break;
1328                                 }
1329                                 if (timer->tmr_device >= id.device) {
1330                                         snd_timer_user_copy_id(&id, timer);
1331                                         break;
1332                                 }
1333                         }
1334                         if (p == &snd_timer_list)
1335                                 snd_timer_user_zero_id(&id);
1336                         break;
1337                 case SNDRV_TIMER_CLASS_CARD:
1338                 case SNDRV_TIMER_CLASS_PCM:
1339                         if (id.card < 0) {
1340                                 id.card = 0;
1341                         } else {
1342                                 if (id.card < 0) {
1343                                         id.card = 0;
1344                                 } else {
1345                                         if (id.device < 0) {
1346                                                 id.device = 0;
1347                                         } else {
1348                                                 if (id.subdevice < 0) {
1349                                                         id.subdevice = 0;
1350                                                 } else {
1351                                                         id.subdevice++;
1352                                                 }
1353                                         }
1354                                 }
1355                         }
1356                         list_for_each(p, &snd_timer_list) {
1357                                 timer = list_entry(p, struct snd_timer, device_list);
1358                                 if (timer->tmr_class > id.dev_class) {
1359                                         snd_timer_user_copy_id(&id, timer);
1360                                         break;
1361                                 }
1362                                 if (timer->tmr_class < id.dev_class)
1363                                         continue;
1364                                 if (timer->card->number > id.card) {
1365                                         snd_timer_user_copy_id(&id, timer);
1366                                         break;
1367                                 }
1368                                 if (timer->card->number < id.card)
1369                                         continue;
1370                                 if (timer->tmr_device > id.device) {
1371                                         snd_timer_user_copy_id(&id, timer);
1372                                         break;
1373                                 }
1374                                 if (timer->tmr_device < id.device)
1375                                         continue;
1376                                 if (timer->tmr_subdevice > id.subdevice) {
1377                                         snd_timer_user_copy_id(&id, timer);
1378                                         break;
1379                                 }
1380                                 if (timer->tmr_subdevice < id.subdevice)
1381                                         continue;
1382                                 snd_timer_user_copy_id(&id, timer);
1383                                 break;
1384                         }
1385                         if (p == &snd_timer_list)
1386                                 snd_timer_user_zero_id(&id);
1387                         break;
1388                 default:
1389                         snd_timer_user_zero_id(&id);
1390                 }
1391         }
1392         mutex_unlock(&register_mutex);
1393         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1394                 return -EFAULT;
1395         return 0;
1396 }
1397
1398 static int snd_timer_user_ginfo(struct file *file,
1399                                 struct snd_timer_ginfo __user *_ginfo)
1400 {
1401         struct snd_timer_ginfo *ginfo;
1402         struct snd_timer_id tid;
1403         struct snd_timer *t;
1404         struct list_head *p;
1405         int err = 0;
1406
1407         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1408         if (IS_ERR(ginfo))
1409                 return PTR_ERR(ginfo);
1410
1411         tid = ginfo->tid;
1412         memset(ginfo, 0, sizeof(*ginfo));
1413         ginfo->tid = tid;
1414         mutex_lock(&register_mutex);
1415         t = snd_timer_find(&tid);
1416         if (t != NULL) {
1417                 ginfo->card = t->card ? t->card->number : -1;
1418                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1419                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1420                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1421                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1422                 ginfo->resolution = t->hw.resolution;
1423                 if (t->hw.resolution_min > 0) {
1424                         ginfo->resolution_min = t->hw.resolution_min;
1425                         ginfo->resolution_max = t->hw.resolution_max;
1426                 }
1427                 list_for_each(p, &t->open_list_head) {
1428                         ginfo->clients++;
1429                 }
1430         } else {
1431                 err = -ENODEV;
1432         }
1433         mutex_unlock(&register_mutex);
1434         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1435                 err = -EFAULT;
1436         kfree(ginfo);
1437         return err;
1438 }
1439
1440 static int snd_timer_user_gparams(struct file *file,
1441                                   struct snd_timer_gparams __user *_gparams)
1442 {
1443         struct snd_timer_gparams gparams;
1444         struct snd_timer *t;
1445         int err;
1446
1447         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1448                 return -EFAULT;
1449         mutex_lock(&register_mutex);
1450         t = snd_timer_find(&gparams.tid);
1451         if (!t) {
1452                 err = -ENODEV;
1453                 goto _error;
1454         }
1455         if (!list_empty(&t->open_list_head)) {
1456                 err = -EBUSY;
1457                 goto _error;
1458         }
1459         if (!t->hw.set_period) {
1460                 err = -ENOSYS;
1461                 goto _error;
1462         }
1463         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1464 _error:
1465         mutex_unlock(&register_mutex);
1466         return err;
1467 }
1468
1469 static int snd_timer_user_gstatus(struct file *file,
1470                                   struct snd_timer_gstatus __user *_gstatus)
1471 {
1472         struct snd_timer_gstatus gstatus;
1473         struct snd_timer_id tid;
1474         struct snd_timer *t;
1475         int err = 0;
1476
1477         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1478                 return -EFAULT;
1479         tid = gstatus.tid;
1480         memset(&gstatus, 0, sizeof(gstatus));
1481         gstatus.tid = tid;
1482         mutex_lock(&register_mutex);
1483         t = snd_timer_find(&tid);
1484         if (t != NULL) {
1485                 if (t->hw.c_resolution)
1486                         gstatus.resolution = t->hw.c_resolution(t);
1487                 else
1488                         gstatus.resolution = t->hw.resolution;
1489                 if (t->hw.precise_resolution) {
1490                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1491                                                  &gstatus.resolution_den);
1492                 } else {
1493                         gstatus.resolution_num = gstatus.resolution;
1494                         gstatus.resolution_den = 1000000000uL;
1495                 }
1496         } else {
1497                 err = -ENODEV;
1498         }
1499         mutex_unlock(&register_mutex);
1500         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1501                 err = -EFAULT;
1502         return err;
1503 }
1504
1505 static int snd_timer_user_tselect(struct file *file,
1506                                   struct snd_timer_select __user *_tselect)
1507 {
1508         struct snd_timer_user *tu;
1509         struct snd_timer_select tselect;
1510         char str[32];
1511         int err = 0;
1512
1513         tu = file->private_data;
1514         mutex_lock(&tu->tread_sem);
1515         if (tu->timeri) {
1516                 snd_timer_close(tu->timeri);
1517                 tu->timeri = NULL;
1518         }
1519         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1520                 err = -EFAULT;
1521                 goto __err;
1522         }
1523         sprintf(str, "application %i", current->pid);
1524         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1525                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1526         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1527         if (err < 0)
1528                 goto __err;
1529
1530         kfree(tu->queue);
1531         tu->queue = NULL;
1532         kfree(tu->tqueue);
1533         tu->tqueue = NULL;
1534         if (tu->tread) {
1535                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1536                                      GFP_KERNEL);
1537                 if (tu->tqueue == NULL)
1538                         err = -ENOMEM;
1539         } else {
1540                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1541                                     GFP_KERNEL);
1542                 if (tu->queue == NULL)
1543                         err = -ENOMEM;
1544         }
1545
1546         if (err < 0) {
1547                 snd_timer_close(tu->timeri);
1548                 tu->timeri = NULL;
1549         } else {
1550                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1551                 tu->timeri->callback = tu->tread
1552                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1553                 tu->timeri->ccallback = snd_timer_user_ccallback;
1554                 tu->timeri->callback_data = (void *)tu;
1555         }
1556
1557       __err:
1558         mutex_unlock(&tu->tread_sem);
1559         return err;
1560 }
1561
1562 static int snd_timer_user_info(struct file *file,
1563                                struct snd_timer_info __user *_info)
1564 {
1565         struct snd_timer_user *tu;
1566         struct snd_timer_info *info;
1567         struct snd_timer *t;
1568         int err = 0;
1569
1570         tu = file->private_data;
1571         if (!tu->timeri)
1572                 return -EBADFD;
1573         t = tu->timeri->timer;
1574         if (!t)
1575                 return -EBADFD;
1576
1577         info = kzalloc(sizeof(*info), GFP_KERNEL);
1578         if (! info)
1579                 return -ENOMEM;
1580         info->card = t->card ? t->card->number : -1;
1581         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1582                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1583         strlcpy(info->id, t->id, sizeof(info->id));
1584         strlcpy(info->name, t->name, sizeof(info->name));
1585         info->resolution = t->hw.resolution;
1586         if (copy_to_user(_info, info, sizeof(*_info)))
1587                 err = -EFAULT;
1588         kfree(info);
1589         return err;
1590 }
1591
1592 static int snd_timer_user_params(struct file *file,
1593                                  struct snd_timer_params __user *_params)
1594 {
1595         struct snd_timer_user *tu;
1596         struct snd_timer_params params;
1597         struct snd_timer *t;
1598         struct snd_timer_read *tr;
1599         struct snd_timer_tread *ttr;
1600         int err;
1601
1602         tu = file->private_data;
1603         if (!tu->timeri)
1604                 return -EBADFD;
1605         t = tu->timeri->timer;
1606         if (!t)
1607                 return -EBADFD;
1608         if (copy_from_user(&params, _params, sizeof(params)))
1609                 return -EFAULT;
1610         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1611                 err = -EINVAL;
1612                 goto _end;
1613         }
1614         if (params.queue_size > 0 &&
1615             (params.queue_size < 32 || params.queue_size > 1024)) {
1616                 err = -EINVAL;
1617                 goto _end;
1618         }
1619         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1620                               (1<<SNDRV_TIMER_EVENT_TICK)|
1621                               (1<<SNDRV_TIMER_EVENT_START)|
1622                               (1<<SNDRV_TIMER_EVENT_STOP)|
1623                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1624                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1625                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1626                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1627                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1628                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1629                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1630                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1631                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1632                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1633                 err = -EINVAL;
1634                 goto _end;
1635         }
1636         snd_timer_stop(tu->timeri);
1637         spin_lock_irq(&t->lock);
1638         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1639                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1640                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1641         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1642                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1643         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1644                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1645         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1646                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1647         spin_unlock_irq(&t->lock);
1648         if (params.queue_size > 0 &&
1649             (unsigned int)tu->queue_size != params.queue_size) {
1650                 if (tu->tread) {
1651                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1652                                       GFP_KERNEL);
1653                         if (ttr) {
1654                                 kfree(tu->tqueue);
1655                                 tu->queue_size = params.queue_size;
1656                                 tu->tqueue = ttr;
1657                         }
1658                 } else {
1659                         tr = kmalloc(params.queue_size * sizeof(*tr),
1660                                      GFP_KERNEL);
1661                         if (tr) {
1662                                 kfree(tu->queue);
1663                                 tu->queue_size = params.queue_size;
1664                                 tu->queue = tr;
1665                         }
1666                 }
1667         }
1668         tu->qhead = tu->qtail = tu->qused = 0;
1669         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1670                 if (tu->tread) {
1671                         struct snd_timer_tread tread;
1672                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1673                         tread.tstamp.tv_sec = 0;
1674                         tread.tstamp.tv_nsec = 0;
1675                         tread.val = 0;
1676                         snd_timer_user_append_to_tqueue(tu, &tread);
1677                 } else {
1678                         struct snd_timer_read *r = &tu->queue[0];
1679                         r->resolution = 0;
1680                         r->ticks = 0;
1681                         tu->qused++;
1682                         tu->qtail++;
1683                 }
1684         }
1685         tu->filter = params.filter;
1686         tu->ticks = params.ticks;
1687         err = 0;
1688  _end:
1689         if (copy_to_user(_params, &params, sizeof(params)))
1690                 return -EFAULT;
1691         return err;
1692 }
1693
1694 static int snd_timer_user_status(struct file *file,
1695                                  struct snd_timer_status __user *_status)
1696 {
1697         struct snd_timer_user *tu;
1698         struct snd_timer_status status;
1699
1700         tu = file->private_data;
1701         if (!tu->timeri)
1702                 return -EBADFD;
1703         memset(&status, 0, sizeof(status));
1704         status.tstamp = tu->tstamp;
1705         status.resolution = snd_timer_resolution(tu->timeri);
1706         status.lost = tu->timeri->lost;
1707         status.overrun = tu->overrun;
1708         spin_lock_irq(&tu->qlock);
1709         status.queue = tu->qused;
1710         spin_unlock_irq(&tu->qlock);
1711         if (copy_to_user(_status, &status, sizeof(status)))
1712                 return -EFAULT;
1713         return 0;
1714 }
1715
1716 static int snd_timer_user_start(struct file *file)
1717 {
1718         int err;
1719         struct snd_timer_user *tu;
1720
1721         tu = file->private_data;
1722         if (!tu->timeri)
1723                 return -EBADFD;
1724         snd_timer_stop(tu->timeri);
1725         tu->timeri->lost = 0;
1726         tu->last_resolution = 0;
1727         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1728 }
1729
1730 static int snd_timer_user_stop(struct file *file)
1731 {
1732         int err;
1733         struct snd_timer_user *tu;
1734
1735         tu = file->private_data;
1736         if (!tu->timeri)
1737                 return -EBADFD;
1738         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1739 }
1740
1741 static int snd_timer_user_continue(struct file *file)
1742 {
1743         int err;
1744         struct snd_timer_user *tu;
1745
1746         tu = file->private_data;
1747         if (!tu->timeri)
1748                 return -EBADFD;
1749         tu->timeri->lost = 0;
1750         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1751 }
1752
1753 static int snd_timer_user_pause(struct file *file)
1754 {
1755         int err;
1756         struct snd_timer_user *tu;
1757
1758         tu = file->private_data;
1759         if (!tu->timeri)
1760                 return -EBADFD;
1761         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1762 }
1763
1764 enum {
1765         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1766         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1767         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1768         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1769 };
1770
1771 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1772                                  unsigned long arg)
1773 {
1774         struct snd_timer_user *tu;
1775         void __user *argp = (void __user *)arg;
1776         int __user *p = argp;
1777
1778         tu = file->private_data;
1779         switch (cmd) {
1780         case SNDRV_TIMER_IOCTL_PVERSION:
1781                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1782         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1783                 return snd_timer_user_next_device(argp);
1784         case SNDRV_TIMER_IOCTL_TREAD:
1785         {
1786                 int xarg;
1787
1788                 mutex_lock(&tu->tread_sem);
1789                 if (tu->timeri) {       /* too late */
1790                         mutex_unlock(&tu->tread_sem);
1791                         return -EBUSY;
1792                 }
1793                 if (get_user(xarg, p)) {
1794                         mutex_unlock(&tu->tread_sem);
1795                         return -EFAULT;
1796                 }
1797                 tu->tread = xarg ? 1 : 0;
1798                 mutex_unlock(&tu->tread_sem);
1799                 return 0;
1800         }
1801         case SNDRV_TIMER_IOCTL_GINFO:
1802                 return snd_timer_user_ginfo(file, argp);
1803         case SNDRV_TIMER_IOCTL_GPARAMS:
1804                 return snd_timer_user_gparams(file, argp);
1805         case SNDRV_TIMER_IOCTL_GSTATUS:
1806                 return snd_timer_user_gstatus(file, argp);
1807         case SNDRV_TIMER_IOCTL_SELECT:
1808                 return snd_timer_user_tselect(file, argp);
1809         case SNDRV_TIMER_IOCTL_INFO:
1810                 return snd_timer_user_info(file, argp);
1811         case SNDRV_TIMER_IOCTL_PARAMS:
1812                 return snd_timer_user_params(file, argp);
1813         case SNDRV_TIMER_IOCTL_STATUS:
1814                 return snd_timer_user_status(file, argp);
1815         case SNDRV_TIMER_IOCTL_START:
1816         case SNDRV_TIMER_IOCTL_START_OLD:
1817                 return snd_timer_user_start(file);
1818         case SNDRV_TIMER_IOCTL_STOP:
1819         case SNDRV_TIMER_IOCTL_STOP_OLD:
1820                 return snd_timer_user_stop(file);
1821         case SNDRV_TIMER_IOCTL_CONTINUE:
1822         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1823                 return snd_timer_user_continue(file);
1824         case SNDRV_TIMER_IOCTL_PAUSE:
1825         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1826                 return snd_timer_user_pause(file);
1827         }
1828         return -ENOTTY;
1829 }
1830
1831 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1832 {
1833         struct snd_timer_user *tu;
1834
1835         tu = file->private_data;
1836         return fasync_helper(fd, file, on, &tu->fasync);
1837 }
1838
1839 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1840                                    size_t count, loff_t *offset)
1841 {
1842         struct snd_timer_user *tu;
1843         long result = 0, unit;
1844         int err = 0;
1845
1846         tu = file->private_data;
1847         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1848         spin_lock_irq(&tu->qlock);
1849         while ((long)count - result >= unit) {
1850                 while (!tu->qused) {
1851                         wait_queue_t wait;
1852
1853                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1854                                 err = -EAGAIN;
1855                                 break;
1856                         }
1857
1858                         set_current_state(TASK_INTERRUPTIBLE);
1859                         init_waitqueue_entry(&wait, current);
1860                         add_wait_queue(&tu->qchange_sleep, &wait);
1861
1862                         spin_unlock_irq(&tu->qlock);
1863                         schedule();
1864                         spin_lock_irq(&tu->qlock);
1865
1866                         remove_wait_queue(&tu->qchange_sleep, &wait);
1867
1868                         if (signal_pending(current)) {
1869                                 err = -ERESTARTSYS;
1870                                 break;
1871                         }
1872                 }
1873
1874                 spin_unlock_irq(&tu->qlock);
1875                 if (err < 0)
1876                         goto _error;
1877
1878                 if (tu->tread) {
1879                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1880                                          sizeof(struct snd_timer_tread))) {
1881                                 err = -EFAULT;
1882                                 goto _error;
1883                         }
1884                 } else {
1885                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1886                                          sizeof(struct snd_timer_read))) {
1887                                 err = -EFAULT;
1888                                 goto _error;
1889                         }
1890                 }
1891
1892                 tu->qhead %= tu->queue_size;
1893
1894                 result += unit;
1895                 buffer += unit;
1896
1897                 spin_lock_irq(&tu->qlock);
1898                 tu->qused--;
1899         }
1900         spin_unlock_irq(&tu->qlock);
1901  _error:
1902         return result > 0 ? result : err;
1903 }
1904
1905 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1906 {
1907         unsigned int mask;
1908         struct snd_timer_user *tu;
1909
1910         tu = file->private_data;
1911
1912         poll_wait(file, &tu->qchange_sleep, wait);
1913
1914         mask = 0;
1915         if (tu->qused)
1916                 mask |= POLLIN | POLLRDNORM;
1917
1918         return mask;
1919 }
1920
1921 #ifdef CONFIG_COMPAT
1922 #include "timer_compat.c"
1923 #else
1924 #define snd_timer_user_ioctl_compat     NULL
1925 #endif
1926
1927 static const struct file_operations snd_timer_f_ops =
1928 {
1929         .owner =        THIS_MODULE,
1930         .read =         snd_timer_user_read,
1931         .open =         snd_timer_user_open,
1932         .release =      snd_timer_user_release,
1933         .llseek =       no_llseek,
1934         .poll =         snd_timer_user_poll,
1935         .unlocked_ioctl =       snd_timer_user_ioctl,
1936         .compat_ioctl = snd_timer_user_ioctl_compat,
1937         .fasync =       snd_timer_user_fasync,
1938 };
1939
1940 /*
1941  *  ENTRY functions
1942  */
1943
1944 static int __init alsa_timer_init(void)
1945 {
1946         int err;
1947
1948 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1949         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1950                               "system timer");
1951 #endif
1952
1953         if ((err = snd_timer_register_system()) < 0)
1954                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1955                            err);
1956         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1957                                        &snd_timer_f_ops, NULL, "timer")) < 0)
1958                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1959                            err);
1960         snd_timer_proc_init();
1961         return 0;
1962 }
1963
1964 static void __exit alsa_timer_exit(void)
1965 {
1966         struct list_head *p, *n;
1967
1968         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1969         /* unregister the system timer */
1970         list_for_each_safe(p, n, &snd_timer_list) {
1971                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1972                 snd_timer_free(timer);
1973         }
1974         snd_timer_proc_done();
1975 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1976         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1977 #endif
1978 }
1979
1980 module_init(alsa_timer_init)
1981 module_exit(alsa_timer_exit)
1982
1983 EXPORT_SYMBOL(snd_timer_open);
1984 EXPORT_SYMBOL(snd_timer_close);
1985 EXPORT_SYMBOL(snd_timer_resolution);
1986 EXPORT_SYMBOL(snd_timer_start);
1987 EXPORT_SYMBOL(snd_timer_stop);
1988 EXPORT_SYMBOL(snd_timer_continue);
1989 EXPORT_SYMBOL(snd_timer_pause);
1990 EXPORT_SYMBOL(snd_timer_new);
1991 EXPORT_SYMBOL(snd_timer_notify);
1992 EXPORT_SYMBOL(snd_timer_global_new);
1993 EXPORT_SYMBOL(snd_timer_global_free);
1994 EXPORT_SYMBOL(snd_timer_global_register);
1995 EXPORT_SYMBOL(snd_timer_interrupt);