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