SAFE public projects git trees. - safe/jmp/linux-2.6/blob - sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
  23 #include <linux/delay.h>
  24 #include <linux/init.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/moduleparam.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 #ifdef CONFIG_KERNELD
  37 #include <linux/kerneld.h>
  38 #endif
  39
  40 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
  41 #define DEFAULT_TIMER_LIMIT 3
  42 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
  43 #define DEFAULT_TIMER_LIMIT 2
  44 #else
  45 #define DEFAULT_TIMER_LIMIT 1
  46 #endif
  47
  48 static int timer_limit = DEFAULT_TIMER_LIMIT;
  49 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
  50 MODULE_DESCRIPTION("ALSA timer interface");
  51 MODULE_LICENSE("GPL");
  52 module_param(timer_limit, int, 0444);
  53 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  54
  55 typedef struct {
  56         snd_timer_instance_t *timeri;
  57         int tread;                      /* enhanced read with timestamps and events */
  58         unsigned long ticks;
  59         unsigned long overrun;
  60         int qhead;
  61         int qtail;
  62         int qused;
  63         int queue_size;
  64         snd_timer_read_t *queue;
  65         snd_timer_tread_t *tqueue;
  66         spinlock_t qlock;
  67         unsigned long last_resolution;
  68         unsigned int filter;
  69         struct timespec tstamp;         /* trigger tstamp */
  70         wait_queue_head_t qchange_sleep;
  71         struct fasync_struct *fasync;
  72         struct semaphore tread_sem;
  73 } snd_timer_user_t;
  74
  75 /* list of timers */
  76 static LIST_HEAD(snd_timer_list);
  77
  78 /* list of slave instances */
  79 static LIST_HEAD(snd_timer_slave_list);
  80
  81 /* lock for slave active lists */
  82 static DEFINE_SPINLOCK(slave_active_lock);
  83
  84 static DECLARE_MUTEX(register_mutex);
  85
  86 static int snd_timer_free(snd_timer_t *timer);
  87 static int snd_timer_dev_free(snd_device_t *device);
  88 static int snd_timer_dev_register(snd_device_t *device);
  89 static int snd_timer_dev_unregister(snd_device_t *device);
  90
  91 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left);
  92
  93 /*
  94  * create a timer instance with the given owner string.
  95  * when timer is not NULL, increments the module counter
  96  */
  97 static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer)
  98 {
  99         snd_timer_instance_t *timeri;
 100         timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL);
 101         if (timeri == NULL)
 102                 return NULL;
 103         timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL);
 104         if (! timeri->owner) {
 105                 kfree(timeri);
 106                 return NULL;
 107         }
 108         INIT_LIST_HEAD(&timeri->open_list);
 109         INIT_LIST_HEAD(&timeri->active_list);
 110         INIT_LIST_HEAD(&timeri->ack_list);
 111         INIT_LIST_HEAD(&timeri->slave_list_head);
 112         INIT_LIST_HEAD(&timeri->slave_active_head);
 113
 114         timeri->timer = timer;
 115         if (timer && timer->card && !try_module_get(timer->card->module)) {
 116                 kfree(timeri->owner);
 117                 kfree(timeri);
 118                 return NULL;
 119         }
 120
 121         return timeri;
 122 }
 123
 124 /*
 125  * find a timer instance from the given timer id
 126  */
 127 static snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
 128 {
 129         snd_timer_t *timer = NULL;
 130         struct list_head *p;
 131
 132         list_for_each(p, &snd_timer_list) {
 133                 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
 134
 135                 if (timer->tmr_class != tid->dev_class)
 136                         continue;
 137                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 138                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 139                     (timer->card == NULL ||
 140                      timer->card->number != tid->card))
 141                         continue;
 142                 if (timer->tmr_device != tid->device)
 143                         continue;
 144                 if (timer->tmr_subdevice != tid->subdevice)
 145                         continue;
 146                 return timer;
 147         }
 148         return NULL;
 149 }
 150
 151 #ifdef CONFIG_KMOD
 152
 153 static void snd_timer_request(snd_timer_id_t *tid)
 154 {
 155         if (! current->fs->root)
 156                 return;
 157         switch (tid->dev_class) {
 158         case SNDRV_TIMER_CLASS_GLOBAL:
 159                 if (tid->device < timer_limit)
 160                         request_module("snd-timer-%i", tid->device);
 161                 break;
 162         case SNDRV_TIMER_CLASS_CARD:
 163         case SNDRV_TIMER_CLASS_PCM:
 164                 if (tid->card < snd_ecards_limit)
 165                         request_module("snd-card-%i", tid->card);
 166                 break;
 167         default:
 168                 break;
 169         }
 170 }
 171
 172 #endif
 173
 174 /*
 175  * look for a master instance matching with the slave id of the given slave.
 176  * when found, relink the open_link of the slave.
 177  *
 178  * call this with register_mutex down.
 179  */
 180 static void snd_timer_check_slave(snd_timer_instance_t *slave)
 181 {
 182         snd_timer_t *timer;
 183         snd_timer_instance_t *master;
 184         struct list_head *p, *q;
 185
 186         /* FIXME: it's really dumb to look up all entries.. */
 187         list_for_each(p, &snd_timer_list) {
 188                 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
 189                 list_for_each(q, &timer->open_list_head) {
 190                         master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
 191                         if (slave->slave_class == master->slave_class &&
 192                             slave->slave_id == master->slave_id) {
 193                                 list_del(&slave->open_list);
 194                                 list_add_tail(&slave->open_list, &master->slave_list_head);
 195                                 spin_lock_irq(&slave_active_lock);
 196                                 slave->master = master;
 197                                 slave->timer = master->timer;
 198                                 spin_unlock_irq(&slave_active_lock);
 199                                 return;
 200                         }
 201                 }
 202         }
 203 }
 204
 205 /*
 206  * look for slave instances matching with the slave id of the given master.
 207  * when found, relink the open_link of slaves.
 208  *
 209  * call this with register_mutex down.
 210  */
 211 static void snd_timer_check_master(snd_timer_instance_t *master)
 212 {
 213         snd_timer_instance_t *slave;
 214         struct list_head *p, *n;
 215
 216         /* check all pending slaves */
 217         list_for_each_safe(p, n, &snd_timer_slave_list) {
 218                 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
 219                 if (slave->slave_class == master->slave_class &&
 220                     slave->slave_id == master->slave_id) {
 221                         list_del(p);
 222                         list_add_tail(p, &master->slave_list_head);
 223                         spin_lock_irq(&slave_active_lock);
 224                         slave->master = master;
 225                         slave->timer = master->timer;
 226                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 227                                 list_add_tail(&slave->active_list, &master->slave_active_head);
 228                         spin_unlock_irq(&slave_active_lock);
 229                 }
 230         }
 231 }
 232
 233 /*
 234  * open a timer instance
 235  * when opening a master, the slave id must be here given.
 236  */
 237 int snd_timer_open(snd_timer_instance_t **ti,
 238                    char *owner, snd_timer_id_t *tid,
 239                    unsigned int slave_id)
 240 {
 241         snd_timer_t *timer;
 242         snd_timer_instance_t *timeri = NULL;
 243
 244         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 245                 /* open a slave instance */
 246                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 247                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 248                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
 249                         return -EINVAL;
 250                 }
 251                 down(&register_mutex);
 252                 timeri = snd_timer_instance_new(owner, NULL);
 253                 timeri->slave_class = tid->dev_sclass;
 254                 timeri->slave_id = tid->device;
 255                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 256                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 257                 snd_timer_check_slave(timeri);
 258                 up(&register_mutex);
 259                 *ti = timeri;
 260                 return 0;
 261         }
 262
 263         /* open a master instance */
 264         down(&register_mutex);
 265         timer = snd_timer_find(tid);
 266 #ifdef CONFIG_KMOD
 267         if (timer == NULL) {
 268                 up(&register_mutex);
 269                 snd_timer_request(tid);
 270                 down(&register_mutex);
 271                 timer = snd_timer_find(tid);
 272         }
 273 #endif
 274         if (timer) {
 275                 if (!list_empty(&timer->open_list_head)) {
 276                         timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list);
 277                         if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 278                                 up(&register_mutex);
 279                                 return -EBUSY;
 280                         }
 281                 }
 282                 timeri = snd_timer_instance_new(owner, timer);
 283                 if (timeri) {
 284                         timeri->slave_class = tid->dev_sclass;
 285                         timeri->slave_id = slave_id;
 286                         if (list_empty(&timer->open_list_head) && timer->hw.open)
 287                                 timer->hw.open(timer);
 288                         list_add_tail(&timeri->open_list, &timer->open_list_head);
 289                         snd_timer_check_master(timeri);
 290                 }
 291         } else {
 292                 up(&register_mutex);
 293                 return -ENODEV;
 294         }
 295         up(&register_mutex);
 296         *ti = timeri;
 297         return 0;
 298 }
 299
 300 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event);
 301
 302 /*
 303  * close a timer instance
 304  */
 305 int snd_timer_close(snd_timer_instance_t * timeri)
 306 {
 307         snd_timer_t *timer = NULL;
 308         struct list_head *p, *n;
 309         snd_timer_instance_t *slave;
 310
 311         snd_assert(timeri != NULL, return -ENXIO);
 312
 313         /* force to stop the timer */
 314         snd_timer_stop(timeri);
 315
 316         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 317                 /* wait, until the active callback is finished */
 318                 spin_lock_irq(&slave_active_lock);
 319                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 320                         spin_unlock_irq(&slave_active_lock);
 321                         udelay(10);
 322                         spin_lock_irq(&slave_active_lock);
 323                 }
 324                 spin_unlock_irq(&slave_active_lock);
 325                 down(&register_mutex);
 326                 list_del(&timeri->open_list);
 327                 up(&register_mutex);
 328         } else {
 329                 timer = timeri->timer;
 330                 /* wait, until the active callback is finished */
 331                 spin_lock_irq(&timer->lock);
 332                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 333                         spin_unlock_irq(&timer->lock);
 334                         udelay(10);
 335                         spin_lock_irq(&timer->lock);
 336                 }
 337                 spin_unlock_irq(&timer->lock);
 338                 down(&register_mutex);
 339                 list_del(&timeri->open_list);
 340                 if (timer && list_empty(&timer->open_list_head) && timer->hw.close)
 341                         timer->hw.close(timer);
 342                 /* remove slave links */
 343                 list_for_each_safe(p, n, &timeri->slave_list_head) {
 344                         slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
 345                         spin_lock_irq(&slave_active_lock);
 346                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
 347                         list_del(p);
 348                         list_add_tail(p, &snd_timer_slave_list);
 349                         slave->master = NULL;
 350                         slave->timer = NULL;
 351                         spin_unlock_irq(&slave_active_lock);
 352                 }
 353                 up(&register_mutex);
 354         }
 355         if (timeri->private_free)
 356                 timeri->private_free(timeri);
 357         kfree(timeri->owner);
 358         kfree(timeri);
 359         if (timer && timer->card)
 360                 module_put(timer->card->module);
 361         return 0;
 362 }
 363
 364 unsigned long snd_timer_resolution(snd_timer_instance_t * timeri)
 365 {
 366         snd_timer_t * timer;
 367
 368         if (timeri == NULL)
 369                 return 0;
 370         if ((timer = timeri->timer) != NULL) {
 371                 if (timer->hw.c_resolution)
 372                         return timer->hw.c_resolution(timer);
 373                 return timer->hw.resolution;
 374         }
 375         return 0;
 376 }
 377
 378 static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event)
 379 {
 380         snd_timer_t *timer;
 381         unsigned long flags;
 382         unsigned long resolution = 0;
 383         snd_timer_instance_t *ts;
 384         struct list_head *n;
 385         struct timespec tstamp;
 386
 387         snd_timestamp_now(&tstamp, 1);
 388         snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return);
 389         if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE)
 390                 resolution = snd_timer_resolution(ti);
 391         if (ti->ccallback)
 392                 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
 393         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 394                 return;
 395         timer = ti->timer;
 396         if (timer == NULL)
 397                 return;
 398         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 399                 return;
 400         spin_lock_irqsave(&timer->lock, flags);
 401         list_for_each(n, &ti->slave_active_head) {
 402                 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
 403                 if (ts->ccallback)
 404                         ts->ccallback(ti, event + 100, &tstamp, resolution);
 405         }
 406         spin_unlock_irqrestore(&timer->lock, flags);
 407 }
 408
 409 static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks)
 410 {
 411         list_del(&timeri->active_list);
 412         list_add_tail(&timeri->active_list, &timer->active_list_head);
 413         if (timer->running) {
 414                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 415                         goto __start_now;
 416                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 417                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 418                 return 1;       /* delayed start */
 419         } else {
 420                 timer->sticks = sticks;
 421                 timer->hw.start(timer);
 422               __start_now:
 423                 timer->running++;
 424                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 425                 return 0;
 426         }
 427 }
 428
 429 static int snd_timer_start_slave(snd_timer_instance_t *timeri)
 430 {
 431         unsigned long flags;
 432
 433         spin_lock_irqsave(&slave_active_lock, flags);
 434         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 435         if (timeri->master)
 436                 list_add_tail(&timeri->active_list, &timeri->master->slave_active_head);
 437         spin_unlock_irqrestore(&slave_active_lock, flags);
 438         return 1; /* delayed start */
 439 }
 440
 441 /*
 442  *  start the timer instance
 443  */
 444 int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks)
 445 {
 446         snd_timer_t *timer;
 447         int result = -EINVAL;
 448         unsigned long flags;
 449
 450         if (timeri == NULL || ticks < 1)
 451                 return -EINVAL;
 452         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 453                 result = snd_timer_start_slave(timeri);
 454                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 455                 return result;
 456         }
 457         timer = timeri->timer;
 458         if (timer == NULL)
 459                 return -EINVAL;
 460         spin_lock_irqsave(&timer->lock, flags);
 461         timeri->ticks = timeri->cticks = ticks;
 462         timeri->pticks = 0;
 463         result = snd_timer_start1(timer, timeri, ticks);
 464         spin_unlock_irqrestore(&timer->lock, flags);
 465         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
 466         return result;
 467 }
 468
 469 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event)
 470 {
 471         snd_timer_t *timer;
 472         unsigned long flags;
 473
 474         snd_assert(timeri != NULL, return -ENXIO);
 475
 476         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
 477                 if (!keep_flag) {
 478                         spin_lock_irqsave(&slave_active_lock, flags);
 479                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 480                         spin_unlock_irqrestore(&slave_active_lock, flags);
 481                 }
 482                 goto __end;
 483         }
 484         timer = timeri->timer;
 485         if (!timer)
 486                 return -EINVAL;
 487         spin_lock_irqsave(&timer->lock, flags);
 488         list_del_init(&timeri->ack_list);
 489         list_del_init(&timeri->active_list);
 490         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 491             !(--timer->running)) {
 492                 timer->hw.stop(timer);
 493                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 494                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 495                         snd_timer_reschedule(timer, 0);
 496                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 497                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 498                                 timer->hw.start(timer);
 499                         }
 500                 }
 501         }
 502         if (!keep_flag)
 503                 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START);
 504         spin_unlock_irqrestore(&timer->lock, flags);
 505       __end:
 506         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
 507                 snd_timer_notify1(timeri, event);
 508         return 0;
 509 }
 510
 511 /*
 512  * stop the timer instance.
 513  *
 514  * do not call this from the timer callback!
 515  */
 516 int snd_timer_stop(snd_timer_instance_t * timeri)
 517 {
 518         snd_timer_t *timer;
 519         unsigned long flags;
 520         int err;
 521
 522         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
 523         if (err < 0)
 524                 return err;
 525         timer = timeri->timer;
 526         spin_lock_irqsave(&timer->lock, flags);
 527         timeri->cticks = timeri->ticks;
 528         timeri->pticks = 0;
 529         spin_unlock_irqrestore(&timer->lock, flags);
 530         return 0;
 531 }
 532
 533 /*
 534  * start again..  the tick is kept.
 535  */
 536 int snd_timer_continue(snd_timer_instance_t * timeri)
 537 {
 538         snd_timer_t *timer;
 539         int result = -EINVAL;
 540         unsigned long flags;
 541
 542         if (timeri == NULL)
 543                 return result;
 544         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 545                 return snd_timer_start_slave(timeri);
 546         timer = timeri->timer;
 547         if (! timer)
 548                 return -EINVAL;
 549         spin_lock_irqsave(&timer->lock, flags);
 550         if (!timeri->cticks)
 551                 timeri->cticks = 1;
 552         timeri->pticks = 0;
 553         result = snd_timer_start1(timer, timeri, timer->sticks);
 554         spin_unlock_irqrestore(&timer->lock, flags);
 555         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
 556         return result;
 557 }
 558
 559 /*
 560  * pause.. remember the ticks left
 561  */
 562 int snd_timer_pause(snd_timer_instance_t * timeri)
 563 {
 564         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
 565 }
 566
 567 /*
 568  * reschedule the timer
 569  *
 570  * start pending instances and check the scheduling ticks.
 571  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 572  */
 573 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left)
 574 {
 575         snd_timer_instance_t *ti;
 576         unsigned long ticks = ~0UL;
 577         struct list_head *p;
 578
 579         list_for_each(p, &timer->active_list_head) {
 580                 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
 581                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 582                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 583                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 584                         timer->running++;
 585                 }
 586                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 587                         if (ticks > ti->cticks)
 588                                 ticks = ti->cticks;
 589                 }
 590         }
 591         if (ticks == ~0UL) {
 592                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 593                 return;
 594         }
 595         if (ticks > timer->hw.ticks)
 596                 ticks = timer->hw.ticks;
 597         if (ticks_left != ticks)
 598                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 599         timer->sticks = ticks;
 600 }
 601
 602 /*
 603  * timer tasklet
 604  *
 605  */
 606 static void snd_timer_tasklet(unsigned long arg)
 607 {
 608         snd_timer_t *timer = (snd_timer_t *) arg;
 609         snd_timer_instance_t *ti;
 610         struct list_head *p;
 611         unsigned long resolution, ticks;
 612
 613         spin_lock(&timer->lock);
 614         /* now process all callbacks */
 615         while (!list_empty(&timer->sack_list_head)) {
 616                 p = timer->sack_list_head.next;         /* get first item */
 617                 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
 618
 619                 /* remove from ack_list and make empty */
 620                 list_del_init(p);
 621
 622                 ticks = ti->pticks;
 623                 ti->pticks = 0;
 624                 resolution = ti->resolution;
 625
 626                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 627                 spin_unlock(&timer->lock);
 628                 if (ti->callback)
 629                         ti->callback(ti, resolution, ticks);
 630                 spin_lock(&timer->lock);
 631                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 632         }
 633         spin_unlock(&timer->lock);
 634 }
 635
 636 /*
 637  * timer interrupt
 638  *
 639  * ticks_left is usually equal to timer->sticks.
 640  *
 641  */
 642 void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left)
 643 {
 644         snd_timer_instance_t *ti, *ts;
 645         unsigned long resolution, ticks;
 646         struct list_head *p, *q, *n;
 647         int use_tasklet = 0;
 648
 649         if (timer == NULL)
 650                 return;
 651
 652         spin_lock(&timer->lock);
 653
 654         /* remember the current resolution */
 655         if (timer->hw.c_resolution)
 656                 resolution = timer->hw.c_resolution(timer);
 657         else
 658                 resolution = timer->hw.resolution;
 659
 660         /* loop for all active instances
 661          * here we cannot use list_for_each because the active_list of a processed
 662          * instance is relinked to done_list_head before callback is called.
 663          */
 664         list_for_each_safe(p, n, &timer->active_list_head) {
 665                 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
 666                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 667                         continue;
 668                 ti->pticks += ticks_left;
 669                 ti->resolution = resolution;
 670                 if (ti->cticks < ticks_left)
 671                         ti->cticks = 0;
 672                 else
 673                         ti->cticks -= ticks_left;
 674                 if (ti->cticks) /* not expired */
 675                         continue;
 676                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 677                         ti->cticks = ti->ticks;
 678                 } else {
 679                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 680                         if (--timer->running)
 681                                 list_del(p);
 682                 }
 683                 if (list_empty(&ti->ack_list)) {
 684                         if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 685                             (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
 686                                 list_add_tail(&ti->ack_list, &timer->ack_list_head);
 687                         } else {
 688                                 list_add_tail(&ti->ack_list, &timer->sack_list_head);
 689                         }
 690                 }
 691                 list_for_each(q, &ti->slave_active_head) {
 692                         ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list);
 693                         ts->pticks = ti->pticks;
 694                         ts->resolution = resolution;
 695                         if (list_empty(&ts->ack_list)) {
 696                                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 697                                     (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
 698                                         list_add_tail(&ts->ack_list, &timer->ack_list_head);
 699                                 } else {
 700                                         list_add_tail(&ts->ack_list, &timer->sack_list_head);
 701                                 }
 702                         }
 703                 }
 704         }
 705         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 706                 snd_timer_reschedule(timer, ticks_left);
 707         if (timer->running) {
 708                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 709                         timer->hw.stop(timer);
 710                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 711                 }
 712                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 713                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 714                         /* restart timer */
 715                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 716                         timer->hw.start(timer);
 717                 }
 718         } else {
 719                 timer->hw.stop(timer);
 720         }
 721
 722         /* now process all fast callbacks */
 723         while (!list_empty(&timer->ack_list_head)) {
 724                 p = timer->ack_list_head.next;          /* get first item */
 725                 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
 726
 727                 /* remove from ack_list and make empty */
 728                 list_del_init(p);
 729
 730                 ticks = ti->pticks;
 731                 ti->pticks = 0;
 732
 733                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 734                 spin_unlock(&timer->lock);
 735                 if (ti->callback)
 736                         ti->callback(ti, resolution, ticks);
 737                 spin_lock(&timer->lock);
 738                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 739         }
 740
 741         /* do we have any slow callbacks? */
 742         use_tasklet = !list_empty(&timer->sack_list_head);
 743         spin_unlock(&timer->lock);
 744
 745         if (use_tasklet)
 746                 tasklet_hi_schedule(&timer->task_queue);
 747 }
 748
 749 /*
 750
 751  */
 752
 753 int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer)
 754 {
 755         snd_timer_t *timer;
 756         int err;
 757         static snd_device_ops_t ops = {
 758                 .dev_free = snd_timer_dev_free,
 759                 .dev_register = snd_timer_dev_register,
 760                 .dev_unregister = snd_timer_dev_unregister
 761         };
 762
 763         snd_assert(tid != NULL, return -EINVAL);
 764         snd_assert(rtimer != NULL, return -EINVAL);
 765         *rtimer = NULL;
 766         timer = kcalloc(1, sizeof(*timer), GFP_KERNEL);
 767         if (timer == NULL)
 768                 return -ENOMEM;
 769         timer->tmr_class = tid->dev_class;
 770         timer->card = card;
 771         timer->tmr_device = tid->device;
 772         timer->tmr_subdevice = tid->subdevice;
 773         if (id)
 774                 strlcpy(timer->id, id, sizeof(timer->id));
 775         INIT_LIST_HEAD(&timer->device_list);
 776         INIT_LIST_HEAD(&timer->open_list_head);
 777         INIT_LIST_HEAD(&timer->active_list_head);
 778         INIT_LIST_HEAD(&timer->ack_list_head);
 779         INIT_LIST_HEAD(&timer->sack_list_head);
 780         spin_lock_init(&timer->lock);
 781         tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
 782         if (card != NULL) {
 783                 if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) {
 784                         snd_timer_free(timer);
 785                         return err;
 786                 }
 787         }
 788         *rtimer = timer;
 789         return 0;
 790 }
 791
 792 static int snd_timer_free(snd_timer_t *timer)
 793 {
 794         snd_assert(timer != NULL, return -ENXIO);
 795         if (timer->private_free)
 796                 timer->private_free(timer);
 797         kfree(timer);
 798         return 0;
 799 }
 800
 801 int snd_timer_dev_free(snd_device_t *device)
 802 {
 803         snd_timer_t *timer = device->device_data;
 804         return snd_timer_free(timer);
 805 }
 806
 807 int snd_timer_dev_register(snd_device_t *dev)
 808 {
 809         snd_timer_t *timer = dev->device_data;
 810         snd_timer_t *timer1;
 811         struct list_head *p;
 812
 813         snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO);
 814         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 815             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 816                 return -EINVAL;
 817
 818         down(&register_mutex);
 819         list_for_each(p, &snd_timer_list) {
 820                 timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
 821                 if (timer1->tmr_class > timer->tmr_class)
 822                         break;
 823                 if (timer1->tmr_class < timer->tmr_class)
 824                         continue;
 825                 if (timer1->card && timer->card) {
 826                         if (timer1->card->number > timer->card->number)
 827                                 break;
 828                         if (timer1->card->number < timer->card->number)
 829                                 continue;
 830                 }
 831                 if (timer1->tmr_device > timer->tmr_device)
 832                         break;
 833                 if (timer1->tmr_device < timer->tmr_device)
 834                         continue;
 835                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 836                         break;
 837                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 838                         continue;
 839                 /* conflicts.. */
 840                 up(&register_mutex);
 841                 return -EBUSY;
 842         }
 843         list_add_tail(&timer->device_list, p);
 844         up(&register_mutex);
 845         return 0;
 846 }
 847
 848 static int snd_timer_unregister(snd_timer_t *timer)
 849 {
 850         struct list_head *p, *n;
 851         snd_timer_instance_t *ti;
 852
 853         snd_assert(timer != NULL, return -ENXIO);
 854         down(&register_mutex);
 855         if (! list_empty(&timer->open_list_head)) {
 856                 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
 857                 list_for_each_safe(p, n, &timer->open_list_head) {
 858                         list_del_init(p);
 859                         ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
 860                         ti->timer = NULL;
 861                 }
 862         }
 863         list_del(&timer->device_list);
 864         up(&register_mutex);
 865         return snd_timer_free(timer);
 866 }
 867
 868 static int snd_timer_dev_unregister(snd_device_t *device)
 869 {
 870         snd_timer_t *timer = device->device_data;
 871         return snd_timer_unregister(timer);
 872 }
 873
 874 void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp)
 875 {
 876         unsigned long flags;
 877         unsigned long resolution = 0;
 878         snd_timer_instance_t *ti, *ts;
 879         struct list_head *p, *n;
 880
 881         snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return);
 882         snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return);
 883         spin_lock_irqsave(&timer->lock, flags);
 884         if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) {
 885                 if (timer->hw.c_resolution)
 886                         resolution = timer->hw.c_resolution(timer);
 887                 else
 888                         resolution = timer->hw.resolution;
 889         }
 890         list_for_each(p, &timer->active_list_head) {
 891                 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
 892                 if (ti->ccallback)
 893                         ti->ccallback(ti, event, tstamp, resolution);
 894                 list_for_each(n, &ti->slave_active_head) {
 895                         ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
 896                         if (ts->ccallback)
 897                                 ts->ccallback(ts, event, tstamp, resolution);
 898                 }
 899         }
 900         spin_unlock_irqrestore(&timer->lock, flags);
 901 }
 902
 903 /*
 904  * exported functions for global timers
 905  */
 906 int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
 907 {
 908         snd_timer_id_t tid;
 909
 910         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 911         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 912         tid.card = -1;
 913         tid.device = device;
 914         tid.subdevice = 0;
 915         return snd_timer_new(NULL, id, &tid, rtimer);
 916 }
 917
 918 int snd_timer_global_free(snd_timer_t *timer)
 919 {
 920         return snd_timer_free(timer);
 921 }
 922
 923 int snd_timer_global_register(snd_timer_t *timer)
 924 {
 925         snd_device_t dev;
 926
 927         memset(&dev, 0, sizeof(dev));
 928         dev.device_data = timer;
 929         return snd_timer_dev_register(&dev);
 930 }
 931
 932 int snd_timer_global_unregister(snd_timer_t *timer)
 933 {
 934         return snd_timer_unregister(timer);
 935 }
 936
 937 /*
 938  *  System timer
 939  */
 940
 941 struct snd_timer_system_private {
 942         struct timer_list tlist;
 943         struct timer * timer;
 944         unsigned long last_expires;
 945         unsigned long last_jiffies;
 946         unsigned long correction;
 947 };
 948
 949 static void snd_timer_s_function(unsigned long data)
 950 {
 951         snd_timer_t *timer = (snd_timer_t *)data;
 952         struct snd_timer_system_private *priv = timer->private_data;
 953         unsigned long jiff = jiffies;
 954         if (time_after(jiff, priv->last_expires))
 955                 priv->correction = (long)jiff - (long)priv->last_expires;
 956         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
 957 }
 958
 959 static int snd_timer_s_start(snd_timer_t * timer)
 960 {
 961         struct snd_timer_system_private *priv;
 962         unsigned long njiff;
 963
 964         priv = (struct snd_timer_system_private *) timer->private_data;
 965         njiff = (priv->last_jiffies = jiffies);
 966         if (priv->correction > timer->sticks - 1) {
 967                 priv->correction -= timer->sticks - 1;
 968                 njiff++;
 969         } else {
 970                 njiff += timer->sticks - priv->correction;
 971                 priv->correction -= timer->sticks;
 972         }
 973         priv->last_expires = priv->tlist.expires = njiff;
 974         add_timer(&priv->tlist);
 975         return 0;
 976 }
 977
 978 static int snd_timer_s_stop(snd_timer_t * timer)
 979 {
 980         struct snd_timer_system_private *priv;
 981         unsigned long jiff;
 982
 983         priv = (struct snd_timer_system_private *) timer->private_data;
 984         del_timer(&priv->tlist);
 985         jiff = jiffies;
 986         if (time_before(jiff, priv->last_expires))
 987                 timer->sticks = priv->last_expires - jiff;
 988         else
 989                 timer->sticks = 1;
 990         return 0;
 991 }
 992
 993 static struct _snd_timer_hardware snd_timer_system =
 994 {
 995         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
 996         .resolution =   1000000000L / HZ,
 997         .ticks =        10000000L,
 998         .start =        snd_timer_s_start,
 999         .stop =         snd_timer_s_stop
1000 };
1001
1002 static void snd_timer_free_system(snd_timer_t *timer)
1003 {
1004         kfree(timer->private_data);
1005 }
1006
1007 static int snd_timer_register_system(void)
1008 {
1009         snd_timer_t *timer;
1010         struct snd_timer_system_private *priv;
1011         int err;
1012
1013         if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0)
1014                 return err;
1015         strcpy(timer->name, "system timer");
1016         timer->hw = snd_timer_system;
1017         priv = kcalloc(1, sizeof(*priv), GFP_KERNEL);
1018         if (priv == NULL) {
1019                 snd_timer_free(timer);
1020                 return -ENOMEM;
1021         }
1022         init_timer(&priv->tlist);
1023         priv->tlist.function = snd_timer_s_function;
1024         priv->tlist.data = (unsigned long) timer;
1025         timer->private_data = priv;
1026         timer->private_free = snd_timer_free_system;
1027         return snd_timer_global_register(timer);
1028 }
1029
1030 /*
1031  *  Info interface
1032  */
1033
1034 static void snd_timer_proc_read(snd_info_entry_t *entry,
1035                                 snd_info_buffer_t * buffer)
1036 {
1037         unsigned long flags;
1038         snd_timer_t *timer;
1039         snd_timer_instance_t *ti;
1040         struct list_head *p, *q;
1041
1042         down(&register_mutex);
1043         list_for_each(p, &snd_timer_list) {
1044                 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1045                 switch (timer->tmr_class) {
1046                 case SNDRV_TIMER_CLASS_GLOBAL:
1047                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1048                         break;
1049                 case SNDRV_TIMER_CLASS_CARD:
1050                         snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device);
1051                         break;
1052                 case SNDRV_TIMER_CLASS_PCM:
1053                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice);
1054                         break;
1055                 default:
1056                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice);
1057                 }
1058                 snd_iprintf(buffer, "%s :", timer->name);
1059                 if (timer->hw.resolution)
1060                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks);
1061                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1062                         snd_iprintf(buffer, " SLAVE");
1063                 snd_iprintf(buffer, "\n");
1064                 spin_lock_irqsave(&timer->lock, flags);
1065                 list_for_each(q, &timer->open_list_head) {
1066                         ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
1067                         snd_iprintf(buffer, "  Client %s : %s : lost interrupts %li\n",
1068                                         ti->owner ? ti->owner : "unknown",
1069                                         ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped",
1070                                         ti->lost);
1071                 }
1072                 spin_unlock_irqrestore(&timer->lock, flags);
1073         }
1074         up(&register_mutex);
1075 }
1076
1077 /*
1078  *  USER SPACE interface
1079  */
1080
1081 static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1082                                      unsigned long resolution,
1083                                      unsigned long ticks)
1084 {
1085         snd_timer_user_t *tu = timeri->callback_data;
1086         snd_timer_read_t *r;
1087         int prev;
1088
1089         spin_lock(&tu->qlock);
1090         if (tu->qused > 0) {
1091                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1092                 r = &tu->queue[prev];
1093                 if (r->resolution == resolution) {
1094                         r->ticks += ticks;
1095                         goto __wake;
1096                 }
1097         }
1098         if (tu->qused >= tu->queue_size) {
1099                 tu->overrun++;
1100         } else {
1101                 r = &tu->queue[tu->qtail++];
1102                 tu->qtail %= tu->queue_size;
1103                 r->resolution = resolution;
1104                 r->ticks = ticks;
1105                 tu->qused++;
1106         }
1107       __wake:
1108         spin_unlock(&tu->qlock);
1109         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1110         wake_up(&tu->qchange_sleep);
1111 }
1112
1113 static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread)
1114 {
1115         if (tu->qused >= tu->queue_size) {
1116                 tu->overrun++;
1117         } else {
1118                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1119                 tu->qtail %= tu->queue_size;
1120                 tu->qused++;
1121         }
1122 }
1123
1124 static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1125                                      enum sndrv_timer_event event,
1126                                      struct timespec *tstamp,
1127                                      unsigned long resolution)
1128 {
1129         snd_timer_user_t *tu = timeri->callback_data;
1130         snd_timer_tread_t r1;
1131
1132         if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE)
1133                 tu->tstamp = *tstamp;
1134         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1135                 return;
1136         r1.event = event;
1137         r1.tstamp = *tstamp;
1138         r1.val = resolution;
1139         spin_lock(&tu->qlock);
1140         snd_timer_user_append_to_tqueue(tu, &r1);
1141         spin_unlock(&tu->qlock);
1142         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1143         wake_up(&tu->qchange_sleep);
1144 }
1145
1146 static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
1147                                       unsigned long resolution,
1148                                       unsigned long ticks)
1149 {
1150         snd_timer_user_t *tu = timeri->callback_data;
1151         snd_timer_tread_t *r, r1;
1152         struct timespec tstamp;
1153         int prev, append = 0;
1154
1155         snd_timestamp_zero(&tstamp);
1156         spin_lock(&tu->qlock);
1157         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1158                 spin_unlock(&tu->qlock);
1159                 return;
1160         }
1161         if (tu->last_resolution != resolution || ticks > 0)
1162                 snd_timestamp_now(&tstamp, 1);
1163         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) {
1164                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1165                 r1.tstamp = tstamp;
1166                 r1.val = resolution;
1167                 snd_timer_user_append_to_tqueue(tu, &r1);
1168                 tu->last_resolution = resolution;
1169                 append++;
1170         }
1171         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1172                 goto __wake;
1173         if (ticks == 0)
1174                 goto __wake;
1175         if (tu->qused > 0) {
1176                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1177                 r = &tu->tqueue[prev];
1178                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1179                         r->tstamp = tstamp;
1180                         r->val += ticks;
1181                         append++;
1182                         goto __wake;
1183                 }
1184         }
1185         r1.event = SNDRV_TIMER_EVENT_TICK;
1186         r1.tstamp = tstamp;
1187         r1.val = ticks;
1188         snd_timer_user_append_to_tqueue(tu, &r1);
1189         append++;
1190       __wake:
1191         spin_unlock(&tu->qlock);
1192         if (append == 0)
1193                 return;
1194         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1195         wake_up(&tu->qchange_sleep);
1196 }
1197
1198 static int snd_timer_user_open(struct inode *inode, struct file *file)
1199 {
1200         snd_timer_user_t *tu;
1201
1202         tu = kcalloc(1, sizeof(*tu), GFP_KERNEL);
1203         if (tu == NULL)
1204                 return -ENOMEM;
1205         spin_lock_init(&tu->qlock);
1206         init_waitqueue_head(&tu->qchange_sleep);
1207         init_MUTEX(&tu->tread_sem);
1208         tu->ticks = 1;
1209         tu->queue_size = 128;
1210         tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1211         if (tu->queue == NULL) {
1212                 kfree(tu);
1213                 return -ENOMEM;
1214         }
1215         file->private_data = tu;
1216         return 0;
1217 }
1218
1219 static int snd_timer_user_release(struct inode *inode, struct file *file)
1220 {
1221         snd_timer_user_t *tu;
1222
1223         if (file->private_data) {
1224                 tu = file->private_data;
1225                 file->private_data = NULL;
1226                 fasync_helper(-1, file, 0, &tu->fasync);
1227                 if (tu->timeri)
1228                         snd_timer_close(tu->timeri);
1229                 kfree(tu->queue);
1230                 kfree(tu->tqueue);
1231                 kfree(tu);
1232         }
1233         return 0;
1234 }
1235
1236 static void snd_timer_user_zero_id(snd_timer_id_t *id)
1237 {
1238         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1239         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1240         id->card = -1;
1241         id->device = -1;
1242         id->subdevice = -1;
1243 }
1244
1245 static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1246 {
1247         id->dev_class = timer->tmr_class;
1248         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1249         id->card = timer->card ? timer->card->number : -1;
1250         id->device = timer->tmr_device;
1251         id->subdevice = timer->tmr_subdevice;
1252 }
1253
1254 static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1255 {
1256         snd_timer_id_t id;
1257         snd_timer_t *timer;
1258         struct list_head *p;
1259
1260         if (copy_from_user(&id, _tid, sizeof(id)))
1261                 return -EFAULT;
1262         down(&register_mutex);
1263         if (id.dev_class < 0) {         /* first item */
1264                 if (list_empty(&snd_timer_list))
1265                         snd_timer_user_zero_id(&id);
1266                 else {
1267                         timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list);
1268                         snd_timer_user_copy_id(&id, timer);
1269                 }
1270         } else {
1271                 switch (id.dev_class) {
1272                 case SNDRV_TIMER_CLASS_GLOBAL:
1273                         id.device = id.device < 0 ? 0 : id.device + 1;
1274                         list_for_each(p, &snd_timer_list) {
1275                                 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1276                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1277                                         snd_timer_user_copy_id(&id, timer);
1278                                         break;
1279                                 }
1280                                 if (timer->tmr_device >= id.device) {
1281                                         snd_timer_user_copy_id(&id, timer);
1282                                         break;
1283                                 }
1284                         }
1285                         if (p == &snd_timer_list)
1286                                 snd_timer_user_zero_id(&id);
1287                         break;
1288                 case SNDRV_TIMER_CLASS_CARD:
1289                 case SNDRV_TIMER_CLASS_PCM:
1290                         if (id.card < 0) {
1291                                 id.card = 0;
1292                         } else {
1293                                 if (id.card < 0) {
1294                                         id.card = 0;
1295                                 } else {
1296                                         if (id.device < 0) {
1297                                                 id.device = 0;
1298                                         } else {
1299                                                 id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1;
1300                                         }
1301                                 }
1302                         }
1303                         list_for_each(p, &snd_timer_list) {
1304                                 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1305                                 if (timer->tmr_class > id.dev_class) {
1306                                         snd_timer_user_copy_id(&id, timer);
1307                                         break;
1308                                 }
1309                                 if (timer->tmr_class < id.dev_class)
1310                                         continue;
1311                                 if (timer->card->number > id.card) {
1312                                         snd_timer_user_copy_id(&id, timer);
1313                                         break;
1314                                 }
1315                                 if (timer->card->number < id.card)
1316                                         continue;
1317                                 if (timer->tmr_device > id.device) {
1318                                         snd_timer_user_copy_id(&id, timer);
1319                                         break;
1320                                 }
1321                                 if (timer->tmr_device < id.device)
1322                                         continue;
1323                                 if (timer->tmr_subdevice > id.subdevice) {
1324                                         snd_timer_user_copy_id(&id, timer);
1325                                         break;
1326                                 }
1327                                 if (timer->tmr_subdevice < id.subdevice)
1328                                         continue;
1329                                 snd_timer_user_copy_id(&id, timer);
1330                                 break;
1331                         }
1332                         if (p == &snd_timer_list)
1333                                 snd_timer_user_zero_id(&id);
1334                         break;
1335                 default:
1336                         snd_timer_user_zero_id(&id);
1337                 }
1338         }
1339         up(&register_mutex);
1340         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1341                 return -EFAULT;
1342         return 0;
1343 }
1344
1345 static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo)
1346 {
1347         snd_timer_ginfo_t *ginfo;
1348         snd_timer_id_t tid;
1349         snd_timer_t *t;
1350         struct list_head *p;
1351         int err = 0;
1352
1353         ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1354         if (! ginfo)
1355                 return -ENOMEM;
1356         if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1357                 kfree(ginfo);
1358                 return -EFAULT;
1359         }
1360         tid = ginfo->tid;
1361         memset(ginfo, 0, sizeof(*ginfo));
1362         ginfo->tid = tid;
1363         down(&register_mutex);
1364         t = snd_timer_find(&tid);
1365         if (t != NULL) {
1366                 ginfo->card = t->card ? t->card->number : -1;
1367                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1368                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1369                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1370                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1371                 ginfo->resolution = t->hw.resolution;
1372                 if (t->hw.resolution_min > 0) {
1373                         ginfo->resolution_min = t->hw.resolution_min;
1374                         ginfo->resolution_max = t->hw.resolution_max;
1375                 }
1376                 list_for_each(p, &t->open_list_head) {
1377                         ginfo->clients++;
1378                 }
1379         } else {
1380                 err = -ENODEV;
1381         }
1382         up(&register_mutex);
1383         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1384                 err = -EFAULT;
1385         kfree(ginfo);
1386         return err;
1387 }
1388
1389 static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams)
1390 {
1391         snd_timer_gparams_t gparams;
1392         snd_timer_t *t;
1393         int err;
1394
1395         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1396                 return -EFAULT;
1397         down(&register_mutex);
1398         t = snd_timer_find(&gparams.tid);
1399         if (t != NULL) {
1400                 if (list_empty(&t->open_list_head)) {
1401                         if (t->hw.set_period)
1402                                 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1403                         else
1404                                 err = -ENOSYS;
1405                 } else {
1406                         err = -EBUSY;
1407                 }
1408         } else {
1409                 err = -ENODEV;
1410         }
1411         up(&register_mutex);
1412         return err;
1413 }
1414
1415 static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus)
1416 {
1417         snd_timer_gstatus_t gstatus;
1418         snd_timer_id_t tid;
1419         snd_timer_t *t;
1420         int err = 0;
1421
1422         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1423                 return -EFAULT;
1424         tid = gstatus.tid;
1425         memset(&gstatus, 0, sizeof(gstatus));
1426         gstatus.tid = tid;
1427         down(&register_mutex);
1428         t = snd_timer_find(&tid);
1429         if (t != NULL) {
1430                 if (t->hw.c_resolution)
1431                         gstatus.resolution = t->hw.c_resolution(t);
1432                 else
1433                         gstatus.resolution = t->hw.resolution;
1434                 if (t->hw.precise_resolution) {
1435                         t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);
1436                 } else {
1437                         gstatus.resolution_num = gstatus.resolution;
1438                         gstatus.resolution_den = 1000000000uL;
1439                 }
1440         } else {
1441                 err = -ENODEV;
1442         }
1443         up(&register_mutex);
1444         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1445                 err = -EFAULT;
1446         return err;
1447 }
1448
1449 static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect)
1450 {
1451         snd_timer_user_t *tu;
1452         snd_timer_select_t tselect;
1453         char str[32];
1454         int err = 0;
1455
1456         tu = file->private_data;
1457         down(&tu->tread_sem);
1458         if (tu->timeri) {
1459                 snd_timer_close(tu->timeri);
1460                 tu->timeri = NULL;
1461         }
1462         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1463                 err = -EFAULT;
1464                 goto __err;
1465         }
1466         sprintf(str, "application %i", current->pid);
1467         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1468                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1469         if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
1470                 goto __err;
1471
1472         if (tu->queue) {
1473                 kfree(tu->queue);
1474                 tu->queue = NULL;
1475         }
1476         if (tu->tqueue) {
1477                 kfree(tu->tqueue);
1478                 tu->tqueue = NULL;
1479         }
1480         if (tu->tread) {
1481                 tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1482                 if (tu->tqueue == NULL)
1483                         err = -ENOMEM;
1484         } else {
1485                 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1486                 if (tu->queue == NULL)
1487                         err = -ENOMEM;
1488         }
1489
1490         if (err < 0) {
1491                 snd_timer_close(tu->timeri);
1492                 tu->timeri = NULL;
1493         } else {
1494                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1495                 tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1496                 tu->timeri->ccallback = snd_timer_user_ccallback;
1497                 tu->timeri->callback_data = (void *)tu;
1498         }
1499
1500       __err:
1501         up(&tu->tread_sem);
1502         return err;
1503 }
1504
1505 static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
1506 {
1507         snd_timer_user_t *tu;
1508         snd_timer_info_t *info;
1509         snd_timer_t *t;
1510         int err = 0;
1511
1512         tu = file->private_data;
1513         snd_assert(tu->timeri != NULL, return -ENXIO);
1514         t = tu->timeri->timer;
1515         snd_assert(t != NULL, return -ENXIO);
1516
1517         info = kcalloc(1, sizeof(*info), GFP_KERNEL);
1518         if (! info)
1519                 return -ENOMEM;
1520         info->card = t->card ? t->card->number : -1;
1521         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1522                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1523         strlcpy(info->id, t->id, sizeof(info->id));
1524         strlcpy(info->name, t->name, sizeof(info->name));
1525         info->resolution = t->hw.resolution;
1526         if (copy_to_user(_info, info, sizeof(*_info)))
1527                 err = -EFAULT;
1528         kfree(info);
1529         return err;
1530 }
1531
1532 static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params)
1533 {
1534         snd_timer_user_t *tu;
1535         snd_timer_params_t params;
1536         snd_timer_t *t;
1537         snd_timer_read_t *tr;
1538         snd_timer_tread_t *ttr;
1539         int err;
1540
1541         tu = file->private_data;
1542         snd_assert(tu->timeri != NULL, return -ENXIO);
1543         t = tu->timeri->timer;
1544         snd_assert(t != NULL, return -ENXIO);
1545         if (copy_from_user(&params, _params, sizeof(params)))
1546                 return -EFAULT;
1547         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1548                 err = -EINVAL;
1549                 goto _end;
1550         }
1551         if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) {
1552                 err = -EINVAL;
1553                 goto _end;
1554         }
1555         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1556                               (1<<SNDRV_TIMER_EVENT_TICK)|
1557                               (1<<SNDRV_TIMER_EVENT_START)|
1558                               (1<<SNDRV_TIMER_EVENT_STOP)|
1559                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1560                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1561                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1562                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1563                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1564                               (1<<SNDRV_TIMER_EVENT_MPAUSE))) {
1565                 err = -EINVAL;
1566                 goto _end;
1567         }
1568         snd_timer_stop(tu->timeri);
1569         spin_lock_irq(&t->lock);
1570         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1571                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1572                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1573         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1574                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1575         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1576                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1577         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1578                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1579         spin_unlock_irq(&t->lock);
1580         if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) {
1581                 if (tu->tread) {
1582                         ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1583                         if (ttr) {
1584                                 kfree(tu->tqueue);
1585                                 tu->queue_size = params.queue_size;
1586                                 tu->tqueue = ttr;
1587                         }
1588                 } else {
1589                         tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1590                         if (tr) {
1591                                 kfree(tu->queue);
1592                                 tu->queue_size = params.queue_size;
1593                                 tu->queue = tr;
1594                         }
1595                 }
1596         }
1597         tu->qhead = tu->qtail = tu->qused = 0;
1598         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1599                 if (tu->tread) {
1600                         snd_timer_tread_t tread;
1601                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1602                         tread.tstamp.tv_sec = 0;
1603                         tread.tstamp.tv_nsec = 0;
1604                         tread.val = 0;
1605                         snd_timer_user_append_to_tqueue(tu, &tread);
1606                 } else {
1607                         snd_timer_read_t *r = &tu->queue[0];
1608                         r->resolution = 0;
1609                         r->ticks = 0;
1610                         tu->qused++;
1611                         tu->qtail++;
1612                 }
1613
1614         }
1615         tu->filter = params.filter;
1616         tu->ticks = params.ticks;
1617         err = 0;
1618  _end:
1619         if (copy_to_user(_params, &params, sizeof(params)))
1620                 return -EFAULT;
1621         return err;
1622 }
1623
1624 static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status)
1625 {
1626         snd_timer_user_t *tu;
1627         snd_timer_status_t status;
1628
1629         tu = file->private_data;
1630         snd_assert(tu->timeri != NULL, return -ENXIO);
1631         memset(&status, 0, sizeof(status));
1632         status.tstamp = tu->tstamp;
1633         status.resolution = snd_timer_resolution(tu->timeri);
1634         status.lost = tu->timeri->lost;
1635         status.overrun = tu->overrun;
1636         spin_lock_irq(&tu->qlock);
1637         status.queue = tu->qused;
1638         spin_unlock_irq(&tu->qlock);
1639         if (copy_to_user(_status, &status, sizeof(status)))
1640                 return -EFAULT;
1641         return 0;
1642 }
1643
1644 static int snd_timer_user_start(struct file *file)
1645 {
1646         int err;
1647         snd_timer_user_t *tu;
1648
1649         tu = file->private_data;
1650         snd_assert(tu->timeri != NULL, return -ENXIO);
1651         snd_timer_stop(tu->timeri);
1652         tu->timeri->lost = 0;
1653         tu->last_resolution = 0;
1654         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1655 }
1656
1657 static int snd_timer_user_stop(struct file *file)
1658 {
1659         int err;
1660         snd_timer_user_t *tu;
1661
1662         tu = file->private_data;
1663         snd_assert(tu->timeri != NULL, return -ENXIO);
1664         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1665 }
1666
1667 static int snd_timer_user_continue(struct file *file)
1668 {
1669         int err;
1670         snd_timer_user_t *tu;
1671
1672         tu = file->private_data;
1673         snd_assert(tu->timeri != NULL, return -ENXIO);
1674         tu->timeri->lost = 0;
1675         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1676 }
1677
1678 static int snd_timer_user_pause(struct file *file)
1679 {
1680         int err;
1681         snd_timer_user_t *tu;
1682
1683         tu = file->private_data;
1684         snd_assert(tu->timeri != NULL, return -ENXIO);
1685         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1686 }
1687
1688 enum {
1689         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1690         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1691         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1692         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1693 };
1694
1695 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1696 {
1697         snd_timer_user_t *tu;
1698         void __user *argp = (void __user *)arg;
1699         int __user *p = argp;
1700
1701         tu = file->private_data;
1702         switch (cmd) {
1703         case SNDRV_TIMER_IOCTL_PVERSION:
1704                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1705         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1706                 return snd_timer_user_next_device(argp);
1707         case SNDRV_TIMER_IOCTL_TREAD:
1708         {
1709                 int xarg;
1710
1711                 down(&tu->tread_sem);
1712                 if (tu->timeri) {       /* too late */
1713                         up(&tu->tread_sem);
1714                         return -EBUSY;
1715                 }
1716                 if (get_user(xarg, p)) {
1717                         up(&tu->tread_sem);
1718                         return -EFAULT;
1719                 }
1720                 tu->tread = xarg ? 1 : 0;
1721                 up(&tu->tread_sem);
1722                 return 0;
1723         }
1724         case SNDRV_TIMER_IOCTL_GINFO:
1725                 return snd_timer_user_ginfo(file, argp);
1726         case SNDRV_TIMER_IOCTL_GPARAMS:
1727                 return snd_timer_user_gparams(file, argp);
1728         case SNDRV_TIMER_IOCTL_GSTATUS:
1729                 return snd_timer_user_gstatus(file, argp);
1730         case SNDRV_TIMER_IOCTL_SELECT:
1731                 return snd_timer_user_tselect(file, argp);
1732         case SNDRV_TIMER_IOCTL_INFO:
1733                 return snd_timer_user_info(file, argp);
1734         case SNDRV_TIMER_IOCTL_PARAMS:
1735                 return snd_timer_user_params(file, argp);
1736         case SNDRV_TIMER_IOCTL_STATUS:
1737                 return snd_timer_user_status(file, argp);
1738         case SNDRV_TIMER_IOCTL_START:
1739         case SNDRV_TIMER_IOCTL_START_OLD:
1740                 return snd_timer_user_start(file);
1741         case SNDRV_TIMER_IOCTL_STOP:
1742         case SNDRV_TIMER_IOCTL_STOP_OLD:
1743                 return snd_timer_user_stop(file);
1744         case SNDRV_TIMER_IOCTL_CONTINUE:
1745         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1746                 return snd_timer_user_continue(file);
1747         case SNDRV_TIMER_IOCTL_PAUSE:
1748         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1749                 return snd_timer_user_pause(file);
1750         }
1751         return -ENOTTY;
1752 }
1753
1754 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1755 {
1756         snd_timer_user_t *tu;
1757         int err;
1758
1759         tu = file->private_data;
1760         err = fasync_helper(fd, file, on, &tu->fasync);
1761         if (err < 0)
1762                 return err;
1763         return 0;
1764 }
1765
1766 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
1767 {
1768         snd_timer_user_t *tu;
1769         long result = 0, unit;
1770         int err = 0;
1771
1772         tu = file->private_data;
1773         unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1774         spin_lock_irq(&tu->qlock);
1775         while ((long)count - result >= unit) {
1776                 while (!tu->qused) {
1777                         wait_queue_t wait;
1778
1779                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1780                                 err = -EAGAIN;
1781                                 break;
1782                         }
1783
1784                         set_current_state(TASK_INTERRUPTIBLE);
1785                         init_waitqueue_entry(&wait, current);
1786                         add_wait_queue(&tu->qchange_sleep, &wait);
1787
1788                         spin_unlock_irq(&tu->qlock);
1789                         schedule();
1790                         spin_lock_irq(&tu->qlock);
1791
1792                         remove_wait_queue(&tu->qchange_sleep, &wait);
1793
1794                         if (signal_pending(current)) {
1795                                 err = -ERESTARTSYS;
1796                                 break;
1797                         }
1798                 }
1799
1800                 spin_unlock_irq(&tu->qlock);
1801                 if (err < 0)
1802                         goto _error;
1803
1804                 if (tu->tread) {
1805                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) {
1806                                 err = -EFAULT;
1807                                 goto _error;
1808                         }
1809                 } else {
1810                         if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) {
1811                                 err = -EFAULT;
1812                                 goto _error;
1813                         }
1814                 }
1815
1816                 tu->qhead %= tu->queue_size;
1817
1818                 result += unit;
1819                 buffer += unit;
1820
1821                 spin_lock_irq(&tu->qlock);
1822                 tu->qused--;
1823         }
1824         spin_unlock_irq(&tu->qlock);
1825  _error:
1826         return result > 0 ? result : err;
1827 }
1828
1829 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1830 {
1831         unsigned int mask;
1832         snd_timer_user_t *tu;
1833
1834         tu = file->private_data;
1835
1836         poll_wait(file, &tu->qchange_sleep, wait);
1837
1838         mask = 0;
1839         if (tu->qused)
1840                 mask |= POLLIN | POLLRDNORM;
1841
1842         return mask;
1843 }
1844
1845 #ifdef CONFIG_COMPAT
1846 #include "timer_compat.c"
1847 #else
1848 #define snd_timer_user_ioctl_compat     NULL
1849 #endif
1850
1851 static struct file_operations snd_timer_f_ops =
1852 {
1853         .owner =        THIS_MODULE,
1854         .read =         snd_timer_user_read,
1855         .open =         snd_timer_user_open,
1856         .release =      snd_timer_user_release,
1857         .poll =         snd_timer_user_poll,
1858         .unlocked_ioctl =       snd_timer_user_ioctl,
1859         .compat_ioctl = snd_timer_user_ioctl_compat,
1860         .fasync =       snd_timer_user_fasync,
1861 };
1862
1863 static snd_minor_t snd_timer_reg =
1864 {
1865         .comment =      "timer",
1866         .f_ops =        &snd_timer_f_ops,
1867 };
1868
1869 /*
1870  *  ENTRY functions
1871  */
1872
1873 static snd_info_entry_t *snd_timer_proc_entry = NULL;
1874
1875 static int __init alsa_timer_init(void)
1876 {
1877         int err;
1878         snd_info_entry_t *entry;
1879
1880 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1881         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer");
1882 #endif
1883         if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) {
1884                 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1885                 entry->c.text.read = snd_timer_proc_read;
1886                 if (snd_info_register(entry) < 0) {
1887                         snd_info_free_entry(entry);
1888                         entry = NULL;
1889                 }
1890         }
1891         snd_timer_proc_entry = entry;
1892         if ((err = snd_timer_register_system()) < 0)
1893                 snd_printk(KERN_ERR "unable to register system timer (%i)\n", err);
1894         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1895                                         NULL, 0, &snd_timer_reg, "timer"))<0)
1896                 snd_printk(KERN_ERR "unable to register timer device (%i)\n", err);
1897         return 0;
1898 }
1899
1900 static void __exit alsa_timer_exit(void)
1901 {
1902         struct list_head *p, *n;
1903
1904         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1905         /* unregister the system timer */
1906         list_for_each_safe(p, n, &snd_timer_list) {
1907                 snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1908                 snd_timer_unregister(timer);
1909         }
1910         if (snd_timer_proc_entry) {
1911                 snd_info_unregister(snd_timer_proc_entry);
1912                 snd_timer_proc_entry = NULL;
1913         }
1914 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1915         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1916 #endif
1917 }
1918
1919 module_init(alsa_timer_init)
1920 module_exit(alsa_timer_exit)
1921
1922 EXPORT_SYMBOL(snd_timer_open);
1923 EXPORT_SYMBOL(snd_timer_close);
1924 EXPORT_SYMBOL(snd_timer_resolution);
1925 EXPORT_SYMBOL(snd_timer_start);
1926 EXPORT_SYMBOL(snd_timer_stop);
1927 EXPORT_SYMBOL(snd_timer_continue);
1928 EXPORT_SYMBOL(snd_timer_pause);
1929 EXPORT_SYMBOL(snd_timer_new);
1930 EXPORT_SYMBOL(snd_timer_notify);
1931 EXPORT_SYMBOL(snd_timer_global_new);
1932 EXPORT_SYMBOL(snd_timer_global_free);
1933 EXPORT_SYMBOL(snd_timer_global_register);
1934 EXPORT_SYMBOL(snd_timer_global_unregister);
1935 EXPORT_SYMBOL(snd_timer_interrupt);