sound/core/timer.c

   1 /*
   2  *  Timers abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <linux/device.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <linux/sched/signal.h>
  31 #include <sound/core.h>
  32 #include <sound/timer.h>
  33 #include <sound/control.h>
  34 #include <sound/info.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37 #include <linux/kmod.h>
  38
  39 /* internal flags */
  40 #define SNDRV_TIMER_IFLG_PAUSED         0x00010000
  41
  42 #if IS_ENABLED(CONFIG_SND_HRTIMER)
  43 #define DEFAULT_TIMER_LIMIT 4
  44 #else
  45 #define DEFAULT_TIMER_LIMIT 1
  46 #endif
  47
  48 static int timer_limit = DEFAULT_TIMER_LIMIT;
  49 static int timer_tstamp_monotonic = 1;
  50 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
  51 MODULE_DESCRIPTION("ALSA timer interface");
  52 MODULE_LICENSE("GPL");
  53 module_param(timer_limit, int, 0444);
  54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
  55 module_param(timer_tstamp_monotonic, int, 0444);
  56 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
  57
  58 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
  59 MODULE_ALIAS("devname:snd/timer");
  60
  61 struct snd_timer_user {
  62         struct snd_timer_instance *timeri;
  63         int tread;              /* enhanced read with timestamps and events */
  64         unsigned long ticks;
  65         unsigned long overrun;
  66         int qhead;
  67         int qtail;
  68         int qused;
  69         int queue_size;
  70         bool disconnected;
  71         struct snd_timer_read *queue;
  72         struct snd_timer_tread *tqueue;
  73         spinlock_t qlock;
  74         unsigned long last_resolution;
  75         unsigned int filter;
  76         struct timespec tstamp;         /* trigger tstamp */
  77         wait_queue_head_t qchange_sleep;
  78         struct fasync_struct *fasync;
  79         struct mutex ioctl_lock;
  80 };
  81
  82 /* list of timers */
  83 static LIST_HEAD(snd_timer_list);
  84
  85 /* list of slave instances */
  86 static LIST_HEAD(snd_timer_slave_list);
  87
  88 /* lock for slave active lists */
  89 static DEFINE_SPINLOCK(slave_active_lock);
  90
  91 #define MAX_SLAVE_INSTANCES     1000
  92 static int num_slaves;
  93
  94 static DEFINE_MUTEX(register_mutex);
  95
  96 static int snd_timer_free(struct snd_timer *timer);
  97 static int snd_timer_dev_free(struct snd_device *device);
  98 static int snd_timer_dev_register(struct snd_device *device);
  99 static int snd_timer_dev_disconnect(struct snd_device *device);
 100
 101 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
 102
 103 /*
 104  * create a timer instance with the given owner string.
 105  * when timer is not NULL, increments the module counter
 106  */
 107 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
 108                                                          struct snd_timer *timer)
 109 {
 110         struct snd_timer_instance *timeri;
 111         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
 112         if (timeri == NULL)
 113                 return NULL;
 114         timeri->owner = kstrdup(owner, GFP_KERNEL);
 115         if (! timeri->owner) {
 116                 kfree(timeri);
 117                 return NULL;
 118         }
 119         INIT_LIST_HEAD(&timeri->open_list);
 120         INIT_LIST_HEAD(&timeri->active_list);
 121         INIT_LIST_HEAD(&timeri->ack_list);
 122         INIT_LIST_HEAD(&timeri->slave_list_head);
 123         INIT_LIST_HEAD(&timeri->slave_active_head);
 124
 125         timeri->timer = timer;
 126         if (timer && !try_module_get(timer->module)) {
 127                 kfree(timeri->owner);
 128                 kfree(timeri);
 129                 return NULL;
 130         }
 131
 132         return timeri;
 133 }
 134
 135 /*
 136  * find a timer instance from the given timer id
 137  */
 138 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
 139 {
 140         struct snd_timer *timer = NULL;
 141
 142         list_for_each_entry(timer, &snd_timer_list, device_list) {
 143                 if (timer->tmr_class != tid->dev_class)
 144                         continue;
 145                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
 146                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
 147                     (timer->card == NULL ||
 148                      timer->card->number != tid->card))
 149                         continue;
 150                 if (timer->tmr_device != tid->device)
 151                         continue;
 152                 if (timer->tmr_subdevice != tid->subdevice)
 153                         continue;
 154                 return timer;
 155         }
 156         return NULL;
 157 }
 158
 159 #ifdef CONFIG_MODULES
 160
 161 static void snd_timer_request(struct snd_timer_id *tid)
 162 {
 163         switch (tid->dev_class) {
 164         case SNDRV_TIMER_CLASS_GLOBAL:
 165                 if (tid->device < timer_limit)
 166                         request_module("snd-timer-%i", tid->device);
 167                 break;
 168         case SNDRV_TIMER_CLASS_CARD:
 169         case SNDRV_TIMER_CLASS_PCM:
 170                 if (tid->card < snd_ecards_limit)
 171                         request_module("snd-card-%i", tid->card);
 172                 break;
 173         default:
 174                 break;
 175         }
 176 }
 177
 178 #endif
 179
 180 /*
 181  * look for a master instance matching with the slave id of the given slave.
 182  * when found, relink the open_link of the slave.
 183  *
 184  * call this with register_mutex down.
 185  */
 186 static int snd_timer_check_slave(struct snd_timer_instance *slave)
 187 {
 188         struct snd_timer *timer;
 189         struct snd_timer_instance *master;
 190
 191         /* FIXME: it's really dumb to look up all entries.. */
 192         list_for_each_entry(timer, &snd_timer_list, device_list) {
 193                 list_for_each_entry(master, &timer->open_list_head, open_list) {
 194                         if (slave->slave_class == master->slave_class &&
 195                             slave->slave_id == master->slave_id) {
 196                                 if (master->timer->num_instances >=
 197                                     master->timer->max_instances)
 198                                         return -EBUSY;
 199                                 list_move_tail(&slave->open_list,
 200                                                &master->slave_list_head);
 201                                 master->timer->num_instances++;
 202                                 spin_lock_irq(&slave_active_lock);
 203                                 slave->master = master;
 204                                 slave->timer = master->timer;
 205                                 spin_unlock_irq(&slave_active_lock);
 206                                 return 0;
 207                         }
 208                 }
 209         }
 210         return 0;
 211 }
 212
 213 /*
 214  * look for slave instances matching with the slave id of the given master.
 215  * when found, relink the open_link of slaves.
 216  *
 217  * call this with register_mutex down.
 218  */
 219 static int snd_timer_check_master(struct snd_timer_instance *master)
 220 {
 221         struct snd_timer_instance *slave, *tmp;
 222
 223         /* check all pending slaves */
 224         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
 225                 if (slave->slave_class == master->slave_class &&
 226                     slave->slave_id == master->slave_id) {
 227                         if (master->timer->num_instances >=
 228                             master->timer->max_instances)
 229                                 return -EBUSY;
 230                         list_move_tail(&slave->open_list, &master->slave_list_head);
 231                         master->timer->num_instances++;
 232                         spin_lock_irq(&slave_active_lock);
 233                         spin_lock(&master->timer->lock);
 234                         slave->master = master;
 235                         slave->timer = master->timer;
 236                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
 237                                 list_add_tail(&slave->active_list,
 238                                               &master->slave_active_head);
 239                         spin_unlock(&master->timer->lock);
 240                         spin_unlock_irq(&slave_active_lock);
 241                 }
 242         }
 243         return 0;
 244 }
 245
 246 static int snd_timer_close_locked(struct snd_timer_instance *timeri,
 247                                   struct device **card_devp_to_put);
 248
 249 /*
 250  * open a timer instance
 251  * when opening a master, the slave id must be here given.
 252  */
 253 int snd_timer_open(struct snd_timer_instance **ti,
 254                    char *owner, struct snd_timer_id *tid,
 255                    unsigned int slave_id)
 256 {
 257         struct snd_timer *timer;
 258         struct snd_timer_instance *timeri = NULL;
 259         struct device *card_dev_to_put = NULL;
 260         int err;
 261
 262         mutex_lock(&register_mutex);
 263         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
 264                 /* open a slave instance */
 265                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
 266                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
 267                         pr_debug("ALSA: timer: invalid slave class %i\n",
 268                                  tid->dev_sclass);
 269                         err = -EINVAL;
 270                         goto unlock;
 271                 }
 272                 if (num_slaves >= MAX_SLAVE_INSTANCES) {
 273                         err = -EBUSY;
 274                         goto unlock;
 275                 }
 276                 timeri = snd_timer_instance_new(owner, NULL);
 277                 if (!timeri) {
 278                         err = -ENOMEM;
 279                         goto unlock;
 280                 }
 281                 timeri->slave_class = tid->dev_sclass;
 282                 timeri->slave_id = tid->device;
 283                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
 284                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
 285                 num_slaves++;
 286                 err = snd_timer_check_slave(timeri);
 287                 if (err < 0) {
 288                         snd_timer_close_locked(timeri, &card_dev_to_put);
 289                         timeri = NULL;
 290                 }
 291                 goto unlock;
 292         }
 293
 294         /* open a master instance */
 295         timer = snd_timer_find(tid);
 296 #ifdef CONFIG_MODULES
 297         if (!timer) {
 298                 mutex_unlock(&register_mutex);
 299                 snd_timer_request(tid);
 300                 mutex_lock(&register_mutex);
 301                 timer = snd_timer_find(tid);
 302         }
 303 #endif
 304         if (!timer) {
 305                 err = -ENODEV;
 306                 goto unlock;
 307         }
 308         if (!list_empty(&timer->open_list_head)) {
 309                 struct snd_timer_instance *t =
 310                         list_entry(timer->open_list_head.next,
 311                                     struct snd_timer_instance, open_list);
 312                 if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
 313                         err = -EBUSY;
 314                         goto unlock;
 315                 }
 316         }
 317         if (timer->num_instances >= timer->max_instances) {
 318                 err = -EBUSY;
 319                 goto unlock;
 320         }
 321         timeri = snd_timer_instance_new(owner, timer);
 322         if (!timeri) {
 323                 err = -ENOMEM;
 324                 goto unlock;
 325         }
 326         /* take a card refcount for safe disconnection */
 327         if (timer->card)
 328                 get_device(&timer->card->card_dev);
 329         timeri->slave_class = tid->dev_sclass;
 330         timeri->slave_id = slave_id;
 331
 332         if (list_empty(&timer->open_list_head) && timer->hw.open) {
 333                 err = timer->hw.open(timer);
 334                 if (err) {
 335                         kfree(timeri->owner);
 336                         kfree(timeri);
 337                         timeri = NULL;
 338
 339                         if (timer->card)
 340                                 card_dev_to_put = &timer->card->card_dev;
 341                         module_put(timer->module);
 342                         goto unlock;
 343                 }
 344         }
 345
 346         list_add_tail(&timeri->open_list, &timer->open_list_head);
 347         timer->num_instances++;
 348         err = snd_timer_check_master(timeri);
 349         if (err < 0) {
 350                 snd_timer_close_locked(timeri, &card_dev_to_put);
 351                 timeri = NULL;
 352         }
 353
 354  unlock:
 355         mutex_unlock(&register_mutex);
 356         /* put_device() is called after unlock for avoiding deadlock */
 357         if (card_dev_to_put)
 358                 put_device(card_dev_to_put);
 359         *ti = timeri;
 360         return err;
 361 }
 362 EXPORT_SYMBOL(snd_timer_open);
 363
 364 /*
 365  * close a timer instance
 366  * call this with register_mutex down.
 367  */
 368 static int snd_timer_close_locked(struct snd_timer_instance *timeri,
 369                                   struct device **card_devp_to_put)
 370 {
 371         struct snd_timer *timer = NULL;
 372         struct snd_timer_instance *slave, *tmp;
 373
 374         list_del(&timeri->open_list);
 375         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 376                 num_slaves--;
 377
 378         /* force to stop the timer */
 379         snd_timer_stop(timeri);
 380
 381         timer = timeri->timer;
 382         if (timer) {
 383                 timer->num_instances--;
 384                 /* wait, until the active callback is finished */
 385                 spin_lock_irq(&timer->lock);
 386                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
 387                         spin_unlock_irq(&timer->lock);
 388                         udelay(10);
 389                         spin_lock_irq(&timer->lock);
 390                 }
 391                 spin_unlock_irq(&timer->lock);
 392
 393                 /* remove slave links */
 394                 spin_lock_irq(&slave_active_lock);
 395                 spin_lock(&timer->lock);
 396                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
 397                                          open_list) {
 398                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
 399                         timer->num_instances--;
 400                         slave->master = NULL;
 401                         slave->timer = NULL;
 402                         list_del_init(&slave->ack_list);
 403                         list_del_init(&slave->active_list);
 404                 }
 405                 spin_unlock(&timer->lock);
 406                 spin_unlock_irq(&slave_active_lock);
 407
 408                 /* slave doesn't need to release timer resources below */
 409                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 410                         timer = NULL;
 411         }
 412
 413         if (timeri->private_free)
 414                 timeri->private_free(timeri);
 415         kfree(timeri->owner);
 416         kfree(timeri);
 417
 418         if (timer) {
 419                 if (list_empty(&timer->open_list_head) && timer->hw.close)
 420                         timer->hw.close(timer);
 421                 /* release a card refcount for safe disconnection */
 422                 if (timer->card)
 423                         *card_devp_to_put = &timer->card->card_dev;
 424                 module_put(timer->module);
 425         }
 426
 427         return 0;
 428 }
 429
 430 /*
 431  * close a timer instance
 432  */
 433 int snd_timer_close(struct snd_timer_instance *timeri)
 434 {
 435         struct device *card_dev_to_put = NULL;
 436         int err;
 437
 438         if (snd_BUG_ON(!timeri))
 439                 return -ENXIO;
 440
 441         mutex_lock(&register_mutex);
 442         err = snd_timer_close_locked(timeri, &card_dev_to_put);
 443         mutex_unlock(&register_mutex);
 444         /* put_device() is called after unlock for avoiding deadlock */
 445         if (card_dev_to_put)
 446                 put_device(card_dev_to_put);
 447         return err;
 448 }
 449 EXPORT_SYMBOL(snd_timer_close);
 450
 451 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
 452 {
 453         struct snd_timer * timer;
 454
 455         if (timeri == NULL)
 456                 return 0;
 457         timer = timeri->timer;
 458         if (timer) {
 459                 if (timer->hw.c_resolution)
 460                         return timer->hw.c_resolution(timer);
 461                 return timer->hw.resolution;
 462         }
 463         return 0;
 464 }
 465 EXPORT_SYMBOL(snd_timer_resolution);
 466
 467 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 468 {
 469         struct snd_timer *timer;
 470         unsigned long resolution = 0;
 471         struct snd_timer_instance *ts;
 472         struct timespec tstamp;
 473
 474         if (timer_tstamp_monotonic)
 475                 ktime_get_ts(&tstamp);
 476         else
 477                 getnstimeofday(&tstamp);
 478         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
 479                        event > SNDRV_TIMER_EVENT_PAUSE))
 480                 return;
 481         if (event == SNDRV_TIMER_EVENT_START ||
 482             event == SNDRV_TIMER_EVENT_CONTINUE)
 483                 resolution = snd_timer_resolution(ti);
 484         if (ti->ccallback)
 485                 ti->ccallback(ti, event, &tstamp, resolution);
 486         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
 487                 return;
 488         timer = ti->timer;
 489         if (timer == NULL)
 490                 return;
 491         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 492                 return;
 493         event += 10; /* convert to SNDRV_TIMER_EVENT_MXXX */
 494         list_for_each_entry(ts, &ti->slave_active_head, active_list)
 495                 if (ts->ccallback)
 496                         ts->ccallback(ts, event, &tstamp, resolution);
 497 }
 498
 499 /* start/continue a master timer */
 500 static int snd_timer_start1(struct snd_timer_instance *timeri,
 501                             bool start, unsigned long ticks)
 502 {
 503         struct snd_timer *timer;
 504         int result;
 505         unsigned long flags;
 506
 507         timer = timeri->timer;
 508         if (!timer)
 509                 return -EINVAL;
 510
 511         spin_lock_irqsave(&timer->lock, flags);
 512         if (timer->card && timer->card->shutdown) {
 513                 result = -ENODEV;
 514                 goto unlock;
 515         }
 516         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 517                              SNDRV_TIMER_IFLG_START)) {
 518                 result = -EBUSY;
 519                 goto unlock;
 520         }
 521
 522         if (start)
 523                 timeri->ticks = timeri->cticks = ticks;
 524         else if (!timeri->cticks)
 525                 timeri->cticks = 1;
 526         timeri->pticks = 0;
 527
 528         list_move_tail(&timeri->active_list, &timer->active_list_head);
 529         if (timer->running) {
 530                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 531                         goto __start_now;
 532                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
 533                 timeri->flags |= SNDRV_TIMER_IFLG_START;
 534                 result = 1; /* delayed start */
 535         } else {
 536                 if (start)
 537                         timer->sticks = ticks;
 538                 timer->hw.start(timer);
 539               __start_now:
 540                 timer->running++;
 541                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 542                 result = 0;
 543         }
 544         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 545                           SNDRV_TIMER_EVENT_CONTINUE);
 546  unlock:
 547         spin_unlock_irqrestore(&timer->lock, flags);
 548         return result;
 549 }
 550
 551 /* start/continue a slave timer */
 552 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
 553                                  bool start)
 554 {
 555         unsigned long flags;
 556
 557         spin_lock_irqsave(&slave_active_lock, flags);
 558         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
 559                 spin_unlock_irqrestore(&slave_active_lock, flags);
 560                 return -EBUSY;
 561         }
 562         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
 563         if (timeri->master && timeri->timer) {
 564                 spin_lock(&timeri->timer->lock);
 565                 list_add_tail(&timeri->active_list,
 566                               &timeri->master->slave_active_head);
 567                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
 568                                   SNDRV_TIMER_EVENT_CONTINUE);
 569                 spin_unlock(&timeri->timer->lock);
 570         }
 571         spin_unlock_irqrestore(&slave_active_lock, flags);
 572         return 1; /* delayed start */
 573 }
 574
 575 /* stop/pause a master timer */
 576 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
 577 {
 578         struct snd_timer *timer;
 579         int result = 0;
 580         unsigned long flags;
 581
 582         timer = timeri->timer;
 583         if (!timer)
 584                 return -EINVAL;
 585         spin_lock_irqsave(&timer->lock, flags);
 586         list_del_init(&timeri->ack_list);
 587         list_del_init(&timeri->active_list);
 588         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
 589                                SNDRV_TIMER_IFLG_START))) {
 590                 result = -EBUSY;
 591                 goto unlock;
 592         }
 593         if (timer->card && timer->card->shutdown)
 594                 goto unlock;
 595         if (stop) {
 596                 timeri->cticks = timeri->ticks;
 597                 timeri->pticks = 0;
 598         }
 599         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
 600             !(--timer->running)) {
 601                 timer->hw.stop(timer);
 602                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
 603                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 604                         snd_timer_reschedule(timer, 0);
 605                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
 606                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 607                                 timer->hw.start(timer);
 608                         }
 609                 }
 610         }
 611         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
 612         if (stop)
 613                 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
 614         else
 615                 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
 616         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 617                           SNDRV_TIMER_EVENT_PAUSE);
 618  unlock:
 619         spin_unlock_irqrestore(&timer->lock, flags);
 620         return result;
 621 }
 622
 623 /* stop/pause a slave timer */
 624 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
 625 {
 626         unsigned long flags;
 627         bool running;
 628
 629         spin_lock_irqsave(&slave_active_lock, flags);
 630         running = timeri->flags & SNDRV_TIMER_IFLG_RUNNING;
 631         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 632         if (timeri->timer) {
 633                 spin_lock(&timeri->timer->lock);
 634                 list_del_init(&timeri->ack_list);
 635                 list_del_init(&timeri->active_list);
 636                 if (running)
 637                         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
 638                                           SNDRV_TIMER_EVENT_PAUSE);
 639                 spin_unlock(&timeri->timer->lock);
 640         }
 641         spin_unlock_irqrestore(&slave_active_lock, flags);
 642         return running ? 0 : -EBUSY;
 643 }
 644
 645 /*
 646  *  start the timer instance
 647  */
 648 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
 649 {
 650         if (timeri == NULL || ticks < 1)
 651                 return -EINVAL;
 652         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 653                 return snd_timer_start_slave(timeri, true);
 654         else
 655                 return snd_timer_start1(timeri, true, ticks);
 656 }
 657 EXPORT_SYMBOL(snd_timer_start);
 658
 659 /*
 660  * stop the timer instance.
 661  *
 662  * do not call this from the timer callback!
 663  */
 664 int snd_timer_stop(struct snd_timer_instance *timeri)
 665 {
 666         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 667                 return snd_timer_stop_slave(timeri, true);
 668         else
 669                 return snd_timer_stop1(timeri, true);
 670 }
 671 EXPORT_SYMBOL(snd_timer_stop);
 672
 673 /*
 674  * start again..  the tick is kept.
 675  */
 676 int snd_timer_continue(struct snd_timer_instance *timeri)
 677 {
 678         /* timer can continue only after pause */
 679         if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
 680                 return -EINVAL;
 681
 682         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 683                 return snd_timer_start_slave(timeri, false);
 684         else
 685                 return snd_timer_start1(timeri, false, 0);
 686 }
 687 EXPORT_SYMBOL(snd_timer_continue);
 688
 689 /*
 690  * pause.. remember the ticks left
 691  */
 692 int snd_timer_pause(struct snd_timer_instance * timeri)
 693 {
 694         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
 695                 return snd_timer_stop_slave(timeri, false);
 696         else
 697                 return snd_timer_stop1(timeri, false);
 698 }
 699 EXPORT_SYMBOL(snd_timer_pause);
 700
 701 /*
 702  * reschedule the timer
 703  *
 704  * start pending instances and check the scheduling ticks.
 705  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
 706  */
 707 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
 708 {
 709         struct snd_timer_instance *ti;
 710         unsigned long ticks = ~0UL;
 711
 712         list_for_each_entry(ti, &timer->active_list_head, active_list) {
 713                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
 714                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
 715                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
 716                         timer->running++;
 717                 }
 718                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
 719                         if (ticks > ti->cticks)
 720                                 ticks = ti->cticks;
 721                 }
 722         }
 723         if (ticks == ~0UL) {
 724                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
 725                 return;
 726         }
 727         if (ticks > timer->hw.ticks)
 728                 ticks = timer->hw.ticks;
 729         if (ticks_left != ticks)
 730                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 731         timer->sticks = ticks;
 732 }
 733
 734 /*
 735  * timer tasklet
 736  *
 737  */
 738 static void snd_timer_tasklet(unsigned long arg)
 739 {
 740         struct snd_timer *timer = (struct snd_timer *) arg;
 741         struct snd_timer_instance *ti;
 742         struct list_head *p;
 743         unsigned long resolution, ticks;
 744         unsigned long flags;
 745
 746         if (timer->card && timer->card->shutdown)
 747                 return;
 748
 749         spin_lock_irqsave(&timer->lock, flags);
 750         /* now process all callbacks */
 751         while (!list_empty(&timer->sack_list_head)) {
 752                 p = timer->sack_list_head.next;         /* get first item */
 753                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 754
 755                 /* remove from ack_list and make empty */
 756                 list_del_init(p);
 757
 758                 ticks = ti->pticks;
 759                 ti->pticks = 0;
 760                 resolution = ti->resolution;
 761
 762                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 763                 spin_unlock(&timer->lock);
 764                 if (ti->callback)
 765                         ti->callback(ti, resolution, ticks);
 766                 spin_lock(&timer->lock);
 767                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 768         }
 769         spin_unlock_irqrestore(&timer->lock, flags);
 770 }
 771
 772 /*
 773  * timer interrupt
 774  *
 775  * ticks_left is usually equal to timer->sticks.
 776  *
 777  */
 778 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 779 {
 780         struct snd_timer_instance *ti, *ts, *tmp;
 781         unsigned long resolution, ticks;
 782         struct list_head *p, *ack_list_head;
 783         unsigned long flags;
 784         int use_tasklet = 0;
 785
 786         if (timer == NULL)
 787                 return;
 788
 789         if (timer->card && timer->card->shutdown)
 790                 return;
 791
 792         spin_lock_irqsave(&timer->lock, flags);
 793
 794         /* remember the current resolution */
 795         if (timer->hw.c_resolution)
 796                 resolution = timer->hw.c_resolution(timer);
 797         else
 798                 resolution = timer->hw.resolution;
 799
 800         /* loop for all active instances
 801          * Here we cannot use list_for_each_entry because the active_list of a
 802          * processed instance is relinked to done_list_head before the callback
 803          * is called.
 804          */
 805         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
 806                                  active_list) {
 807                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
 808                         continue;
 809                 ti->pticks += ticks_left;
 810                 ti->resolution = resolution;
 811                 if (ti->cticks < ticks_left)
 812                         ti->cticks = 0;
 813                 else
 814                         ti->cticks -= ticks_left;
 815                 if (ti->cticks) /* not expired */
 816                         continue;
 817                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
 818                         ti->cticks = ti->ticks;
 819                 } else {
 820                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
 821                         --timer->running;
 822                         list_del_init(&ti->active_list);
 823                 }
 824                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
 825                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
 826                         ack_list_head = &timer->ack_list_head;
 827                 else
 828                         ack_list_head = &timer->sack_list_head;
 829                 if (list_empty(&ti->ack_list))
 830                         list_add_tail(&ti->ack_list, ack_list_head);
 831                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
 832                         ts->pticks = ti->pticks;
 833                         ts->resolution = resolution;
 834                         if (list_empty(&ts->ack_list))
 835                                 list_add_tail(&ts->ack_list, ack_list_head);
 836                 }
 837         }
 838         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
 839                 snd_timer_reschedule(timer, timer->sticks);
 840         if (timer->running) {
 841                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
 842                         timer->hw.stop(timer);
 843                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
 844                 }
 845                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
 846                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
 847                         /* restart timer */
 848                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
 849                         timer->hw.start(timer);
 850                 }
 851         } else {
 852                 timer->hw.stop(timer);
 853         }
 854
 855         /* now process all fast callbacks */
 856         while (!list_empty(&timer->ack_list_head)) {
 857                 p = timer->ack_list_head.next;          /* get first item */
 858                 ti = list_entry(p, struct snd_timer_instance, ack_list);
 859
 860                 /* remove from ack_list and make empty */
 861                 list_del_init(p);
 862
 863                 ticks = ti->pticks;
 864                 ti->pticks = 0;
 865
 866                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
 867                 spin_unlock(&timer->lock);
 868                 if (ti->callback)
 869                         ti->callback(ti, resolution, ticks);
 870                 spin_lock(&timer->lock);
 871                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
 872         }
 873
 874         /* do we have any slow callbacks? */
 875         use_tasklet = !list_empty(&timer->sack_list_head);
 876         spin_unlock_irqrestore(&timer->lock, flags);
 877
 878         if (use_tasklet)
 879                 tasklet_schedule(&timer->task_queue);
 880 }
 881 EXPORT_SYMBOL(snd_timer_interrupt);
 882
 883 /*
 884
 885  */
 886
 887 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
 888                   struct snd_timer **rtimer)
 889 {
 890         struct snd_timer *timer;
 891         int err;
 892         static struct snd_device_ops ops = {
 893                 .dev_free = snd_timer_dev_free,
 894                 .dev_register = snd_timer_dev_register,
 895                 .dev_disconnect = snd_timer_dev_disconnect,
 896         };
 897
 898         if (snd_BUG_ON(!tid))
 899                 return -EINVAL;
 900         if (rtimer)
 901                 *rtimer = NULL;
 902         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 903         if (!timer)
 904                 return -ENOMEM;
 905         timer->tmr_class = tid->dev_class;
 906         timer->card = card;
 907         timer->tmr_device = tid->device;
 908         timer->tmr_subdevice = tid->subdevice;
 909         if (id)
 910                 strlcpy(timer->id, id, sizeof(timer->id));
 911         timer->sticks = 1;
 912         INIT_LIST_HEAD(&timer->device_list);
 913         INIT_LIST_HEAD(&timer->open_list_head);
 914         INIT_LIST_HEAD(&timer->active_list_head);
 915         INIT_LIST_HEAD(&timer->ack_list_head);
 916         INIT_LIST_HEAD(&timer->sack_list_head);
 917         spin_lock_init(&timer->lock);
 918         tasklet_init(&timer->task_queue, snd_timer_tasklet,
 919                      (unsigned long)timer);
 920         timer->max_instances = 1000; /* default limit per timer */
 921         if (card != NULL) {
 922                 timer->module = card->module;
 923                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
 924                 if (err < 0) {
 925                         snd_timer_free(timer);
 926                         return err;
 927                 }
 928         }
 929         if (rtimer)
 930                 *rtimer = timer;
 931         return 0;
 932 }
 933 EXPORT_SYMBOL(snd_timer_new);
 934
 935 static int snd_timer_free(struct snd_timer *timer)
 936 {
 937         if (!timer)
 938                 return 0;
 939
 940         mutex_lock(&register_mutex);
 941         if (! list_empty(&timer->open_list_head)) {
 942                 struct list_head *p, *n;
 943                 struct snd_timer_instance *ti;
 944                 pr_warn("ALSA: timer %p is busy?\n", timer);
 945                 list_for_each_safe(p, n, &timer->open_list_head) {
 946                         list_del_init(p);
 947                         ti = list_entry(p, struct snd_timer_instance, open_list);
 948                         ti->timer = NULL;
 949                 }
 950         }
 951         list_del(&timer->device_list);
 952         mutex_unlock(&register_mutex);
 953
 954         if (timer->private_free)
 955                 timer->private_free(timer);
 956         kfree(timer);
 957         return 0;
 958 }
 959
 960 static int snd_timer_dev_free(struct snd_device *device)
 961 {
 962         struct snd_timer *timer = device->device_data;
 963         return snd_timer_free(timer);
 964 }
 965
 966 static int snd_timer_dev_register(struct snd_device *dev)
 967 {
 968         struct snd_timer *timer = dev->device_data;
 969         struct snd_timer *timer1;
 970
 971         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
 972                 return -ENXIO;
 973         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
 974             !timer->hw.resolution && timer->hw.c_resolution == NULL)
 975                 return -EINVAL;
 976
 977         mutex_lock(&register_mutex);
 978         list_for_each_entry(timer1, &snd_timer_list, device_list) {
 979                 if (timer1->tmr_class > timer->tmr_class)
 980                         break;
 981                 if (timer1->tmr_class < timer->tmr_class)
 982                         continue;
 983                 if (timer1->card && timer->card) {
 984                         if (timer1->card->number > timer->card->number)
 985                                 break;
 986                         if (timer1->card->number < timer->card->number)
 987                                 continue;
 988                 }
 989                 if (timer1->tmr_device > timer->tmr_device)
 990                         break;
 991                 if (timer1->tmr_device < timer->tmr_device)
 992                         continue;
 993                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
 994                         break;
 995                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
 996                         continue;
 997                 /* conflicts.. */
 998                 mutex_unlock(&register_mutex);
 999                 return -EBUSY;
1000         }
1001         list_add_tail(&timer->device_list, &timer1->device_list);
1002         mutex_unlock(&register_mutex);
1003         return 0;
1004 }
1005
1006 static int snd_timer_dev_disconnect(struct snd_device *device)
1007 {
1008         struct snd_timer *timer = device->device_data;
1009         struct snd_timer_instance *ti;
1010
1011         mutex_lock(&register_mutex);
1012         list_del_init(&timer->device_list);
1013         /* wake up pending sleepers */
1014         list_for_each_entry(ti, &timer->open_list_head, open_list) {
1015                 if (ti->disconnect)
1016                         ti->disconnect(ti);
1017         }
1018         mutex_unlock(&register_mutex);
1019         return 0;
1020 }
1021
1022 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1023 {
1024         unsigned long flags;
1025         unsigned long resolution = 0;
1026         struct snd_timer_instance *ti, *ts;
1027
1028         if (timer->card && timer->card->shutdown)
1029                 return;
1030         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1031                 return;
1032         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1033                        event > SNDRV_TIMER_EVENT_MRESUME))
1034                 return;
1035         spin_lock_irqsave(&timer->lock, flags);
1036         if (event == SNDRV_TIMER_EVENT_MSTART ||
1037             event == SNDRV_TIMER_EVENT_MCONTINUE ||
1038             event == SNDRV_TIMER_EVENT_MRESUME) {
1039                 if (timer->hw.c_resolution)
1040                         resolution = timer->hw.c_resolution(timer);
1041                 else
1042                         resolution = timer->hw.resolution;
1043         }
1044         list_for_each_entry(ti, &timer->active_list_head, active_list) {
1045                 if (ti->ccallback)
1046                         ti->ccallback(ti, event, tstamp, resolution);
1047                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1048                         if (ts->ccallback)
1049                                 ts->ccallback(ts, event, tstamp, resolution);
1050         }
1051         spin_unlock_irqrestore(&timer->lock, flags);
1052 }
1053 EXPORT_SYMBOL(snd_timer_notify);
1054
1055 /*
1056  * exported functions for global timers
1057  */
1058 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1059 {
1060         struct snd_timer_id tid;
1061
1062         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1063         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1064         tid.card = -1;
1065         tid.device = device;
1066         tid.subdevice = 0;
1067         return snd_timer_new(NULL, id, &tid, rtimer);
1068 }
1069 EXPORT_SYMBOL(snd_timer_global_new);
1070
1071 int snd_timer_global_free(struct snd_timer *timer)
1072 {
1073         return snd_timer_free(timer);
1074 }
1075 EXPORT_SYMBOL(snd_timer_global_free);
1076
1077 int snd_timer_global_register(struct snd_timer *timer)
1078 {
1079         struct snd_device dev;
1080
1081         memset(&dev, 0, sizeof(dev));
1082         dev.device_data = timer;
1083         return snd_timer_dev_register(&dev);
1084 }
1085 EXPORT_SYMBOL(snd_timer_global_register);
1086
1087 /*
1088  *  System timer
1089  */
1090
1091 struct snd_timer_system_private {
1092         struct timer_list tlist;
1093         unsigned long last_expires;
1094         unsigned long last_jiffies;
1095         unsigned long correction;
1096 };
1097
1098 static void snd_timer_s_function(unsigned long data)
1099 {
1100         struct snd_timer *timer = (struct snd_timer *)data;
1101         struct snd_timer_system_private *priv = timer->private_data;
1102         unsigned long jiff = jiffies;
1103         if (time_after(jiff, priv->last_expires))
1104                 priv->correction += (long)jiff - (long)priv->last_expires;
1105         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1106 }
1107
1108 static int snd_timer_s_start(struct snd_timer * timer)
1109 {
1110         struct snd_timer_system_private *priv;
1111         unsigned long njiff;
1112
1113         priv = (struct snd_timer_system_private *) timer->private_data;
1114         njiff = (priv->last_jiffies = jiffies);
1115         if (priv->correction > timer->sticks - 1) {
1116                 priv->correction -= timer->sticks - 1;
1117                 njiff++;
1118         } else {
1119                 njiff += timer->sticks - priv->correction;
1120                 priv->correction = 0;
1121         }
1122         priv->last_expires = njiff;
1123         mod_timer(&priv->tlist, njiff);
1124         return 0;
1125 }
1126
1127 static int snd_timer_s_stop(struct snd_timer * timer)
1128 {
1129         struct snd_timer_system_private *priv;
1130         unsigned long jiff;
1131
1132         priv = (struct snd_timer_system_private *) timer->private_data;
1133         del_timer(&priv->tlist);
1134         jiff = jiffies;
1135         if (time_before(jiff, priv->last_expires))
1136                 timer->sticks = priv->last_expires - jiff;
1137         else
1138                 timer->sticks = 1;
1139         priv->correction = 0;
1140         return 0;
1141 }
1142
1143 static int snd_timer_s_close(struct snd_timer *timer)
1144 {
1145         struct snd_timer_system_private *priv;
1146
1147         priv = (struct snd_timer_system_private *)timer->private_data;
1148         del_timer_sync(&priv->tlist);
1149         return 0;
1150 }
1151
1152 static struct snd_timer_hardware snd_timer_system =
1153 {
1154         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1155         .resolution =   1000000000L / HZ,
1156         .ticks =        10000000L,
1157         .close =        snd_timer_s_close,
1158         .start =        snd_timer_s_start,
1159         .stop =         snd_timer_s_stop
1160 };
1161
1162 static void snd_timer_free_system(struct snd_timer *timer)
1163 {
1164         kfree(timer->private_data);
1165 }
1166
1167 static int snd_timer_register_system(void)
1168 {
1169         struct snd_timer *timer;
1170         struct snd_timer_system_private *priv;
1171         int err;
1172
1173         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1174         if (err < 0)
1175                 return err;
1176         strcpy(timer->name, "system timer");
1177         timer->hw = snd_timer_system;
1178         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1179         if (priv == NULL) {
1180                 snd_timer_free(timer);
1181                 return -ENOMEM;
1182         }
1183         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1184         timer->private_data = priv;
1185         timer->private_free = snd_timer_free_system;
1186         return snd_timer_global_register(timer);
1187 }
1188
1189 #ifdef CONFIG_SND_PROC_FS
1190 /*
1191  *  Info interface
1192  */
1193
1194 static void snd_timer_proc_read(struct snd_info_entry *entry,
1195                                 struct snd_info_buffer *buffer)
1196 {
1197         struct snd_timer *timer;
1198         struct snd_timer_instance *ti;
1199
1200         mutex_lock(&register_mutex);
1201         list_for_each_entry(timer, &snd_timer_list, device_list) {
1202                 if (timer->card && timer->card->shutdown)
1203                         continue;
1204                 switch (timer->tmr_class) {
1205                 case SNDRV_TIMER_CLASS_GLOBAL:
1206                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1207                         break;
1208                 case SNDRV_TIMER_CLASS_CARD:
1209                         snd_iprintf(buffer, "C%i-%i: ",
1210                                     timer->card->number, timer->tmr_device);
1211                         break;
1212                 case SNDRV_TIMER_CLASS_PCM:
1213                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1214                                     timer->tmr_device, timer->tmr_subdevice);
1215                         break;
1216                 default:
1217                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1218                                     timer->card ? timer->card->number : -1,
1219                                     timer->tmr_device, timer->tmr_subdevice);
1220                 }
1221                 snd_iprintf(buffer, "%s :", timer->name);
1222                 if (timer->hw.resolution)
1223                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1224                                     timer->hw.resolution / 1000,
1225                                     timer->hw.resolution % 1000,
1226                                     timer->hw.ticks);
1227                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1228                         snd_iprintf(buffer, " SLAVE");
1229                 snd_iprintf(buffer, "\n");
1230                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1231                         snd_iprintf(buffer, "  Client %s : %s\n",
1232                                     ti->owner ? ti->owner : "unknown",
1233                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1234                                                  SNDRV_TIMER_IFLG_RUNNING)
1235                                     ? "running" : "stopped");
1236         }
1237         mutex_unlock(&register_mutex);
1238 }
1239
1240 static struct snd_info_entry *snd_timer_proc_entry;
1241
1242 static void __init snd_timer_proc_init(void)
1243 {
1244         struct snd_info_entry *entry;
1245
1246         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1247         if (entry != NULL) {
1248                 entry->c.text.read = snd_timer_proc_read;
1249                 if (snd_info_register(entry) < 0) {
1250                         snd_info_free_entry(entry);
1251                         entry = NULL;
1252                 }
1253         }
1254         snd_timer_proc_entry = entry;
1255 }
1256
1257 static void __exit snd_timer_proc_done(void)
1258 {
1259         snd_info_free_entry(snd_timer_proc_entry);
1260 }
1261 #else /* !CONFIG_SND_PROC_FS */
1262 #define snd_timer_proc_init()
1263 #define snd_timer_proc_done()
1264 #endif
1265
1266 /*
1267  *  USER SPACE interface
1268  */
1269
1270 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1271                                      unsigned long resolution,
1272                                      unsigned long ticks)
1273 {
1274         struct snd_timer_user *tu = timeri->callback_data;
1275         struct snd_timer_read *r;
1276         int prev;
1277
1278         spin_lock(&tu->qlock);
1279         if (tu->qused > 0) {
1280                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1281                 r = &tu->queue[prev];
1282                 if (r->resolution == resolution) {
1283                         r->ticks += ticks;
1284                         goto __wake;
1285                 }
1286         }
1287         if (tu->qused >= tu->queue_size) {
1288                 tu->overrun++;
1289         } else {
1290                 r = &tu->queue[tu->qtail++];
1291                 tu->qtail %= tu->queue_size;
1292                 r->resolution = resolution;
1293                 r->ticks = ticks;
1294                 tu->qused++;
1295         }
1296       __wake:
1297         spin_unlock(&tu->qlock);
1298         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1299         wake_up(&tu->qchange_sleep);
1300 }
1301
1302 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1303                                             struct snd_timer_tread *tread)
1304 {
1305         if (tu->qused >= tu->queue_size) {
1306                 tu->overrun++;
1307         } else {
1308                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1309                 tu->qtail %= tu->queue_size;
1310                 tu->qused++;
1311         }
1312 }
1313
1314 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1315                                      int event,
1316                                      struct timespec *tstamp,
1317                                      unsigned long resolution)
1318 {
1319         struct snd_timer_user *tu = timeri->callback_data;
1320         struct snd_timer_tread r1;
1321         unsigned long flags;
1322
1323         if (event >= SNDRV_TIMER_EVENT_START &&
1324             event <= SNDRV_TIMER_EVENT_PAUSE)
1325                 tu->tstamp = *tstamp;
1326         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1327                 return;
1328         memset(&r1, 0, sizeof(r1));
1329         r1.event = event;
1330         r1.tstamp = *tstamp;
1331         r1.val = resolution;
1332         spin_lock_irqsave(&tu->qlock, flags);
1333         snd_timer_user_append_to_tqueue(tu, &r1);
1334         spin_unlock_irqrestore(&tu->qlock, flags);
1335         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1336         wake_up(&tu->qchange_sleep);
1337 }
1338
1339 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1340 {
1341         struct snd_timer_user *tu = timeri->callback_data;
1342
1343         tu->disconnected = true;
1344         wake_up(&tu->qchange_sleep);
1345 }
1346
1347 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1348                                       unsigned long resolution,
1349                                       unsigned long ticks)
1350 {
1351         struct snd_timer_user *tu = timeri->callback_data;
1352         struct snd_timer_tread *r, r1;
1353         struct timespec tstamp;
1354         int prev, append = 0;
1355
1356         memset(&r1, 0, sizeof(r1));
1357         memset(&tstamp, 0, sizeof(tstamp));
1358         spin_lock(&tu->qlock);
1359         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1360                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1361                 spin_unlock(&tu->qlock);
1362                 return;
1363         }
1364         if (tu->last_resolution != resolution || ticks > 0) {
1365                 if (timer_tstamp_monotonic)
1366                         ktime_get_ts(&tstamp);
1367                 else
1368                         getnstimeofday(&tstamp);
1369         }
1370         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1371             tu->last_resolution != resolution) {
1372                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1373                 r1.tstamp = tstamp;
1374                 r1.val = resolution;
1375                 snd_timer_user_append_to_tqueue(tu, &r1);
1376                 tu->last_resolution = resolution;
1377                 append++;
1378         }
1379         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1380                 goto __wake;
1381         if (ticks == 0)
1382                 goto __wake;
1383         if (tu->qused > 0) {
1384                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1385                 r = &tu->tqueue[prev];
1386                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1387                         r->tstamp = tstamp;
1388                         r->val += ticks;
1389                         append++;
1390                         goto __wake;
1391                 }
1392         }
1393         r1.event = SNDRV_TIMER_EVENT_TICK;
1394         r1.tstamp = tstamp;
1395         r1.val = ticks;
1396         snd_timer_user_append_to_tqueue(tu, &r1);
1397         append++;
1398       __wake:
1399         spin_unlock(&tu->qlock);
1400         if (append == 0)
1401                 return;
1402         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1403         wake_up(&tu->qchange_sleep);
1404 }
1405
1406 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1407 {
1408         struct snd_timer_read *queue = NULL;
1409         struct snd_timer_tread *tqueue = NULL;
1410
1411         if (tu->tread) {
1412                 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1413                 if (!tqueue)
1414                         return -ENOMEM;
1415         } else {
1416                 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1417                 if (!queue)
1418                         return -ENOMEM;
1419         }
1420
1421         spin_lock_irq(&tu->qlock);
1422         kfree(tu->queue);
1423         kfree(tu->tqueue);
1424         tu->queue_size = size;
1425         tu->queue = queue;
1426         tu->tqueue = tqueue;
1427         tu->qhead = tu->qtail = tu->qused = 0;
1428         spin_unlock_irq(&tu->qlock);
1429
1430         return 0;
1431 }
1432
1433 static int snd_timer_user_open(struct inode *inode, struct file *file)
1434 {
1435         struct snd_timer_user *tu;
1436         int err;
1437
1438         err = nonseekable_open(inode, file);
1439         if (err < 0)
1440                 return err;
1441
1442         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1443         if (tu == NULL)
1444                 return -ENOMEM;
1445         spin_lock_init(&tu->qlock);
1446         init_waitqueue_head(&tu->qchange_sleep);
1447         mutex_init(&tu->ioctl_lock);
1448         tu->ticks = 1;
1449         if (realloc_user_queue(tu, 128) < 0) {
1450                 kfree(tu);
1451                 return -ENOMEM;
1452         }
1453         file->private_data = tu;
1454         return 0;
1455 }
1456
1457 static int snd_timer_user_release(struct inode *inode, struct file *file)
1458 {
1459         struct snd_timer_user *tu;
1460
1461         if (file->private_data) {
1462                 tu = file->private_data;
1463                 file->private_data = NULL;
1464                 mutex_lock(&tu->ioctl_lock);
1465                 if (tu->timeri)
1466                         snd_timer_close(tu->timeri);
1467                 mutex_unlock(&tu->ioctl_lock);
1468                 kfree(tu->queue);
1469                 kfree(tu->tqueue);
1470                 kfree(tu);
1471         }
1472         return 0;
1473 }
1474
1475 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1476 {
1477         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1478         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1479         id->card = -1;
1480         id->device = -1;
1481         id->subdevice = -1;
1482 }
1483
1484 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1485 {
1486         id->dev_class = timer->tmr_class;
1487         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1488         id->card = timer->card ? timer->card->number : -1;
1489         id->device = timer->tmr_device;
1490         id->subdevice = timer->tmr_subdevice;
1491 }
1492
1493 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1494 {
1495         struct snd_timer_id id;
1496         struct snd_timer *timer;
1497         struct list_head *p;
1498
1499         if (copy_from_user(&id, _tid, sizeof(id)))
1500                 return -EFAULT;
1501         mutex_lock(&register_mutex);
1502         if (id.dev_class < 0) {         /* first item */
1503                 if (list_empty(&snd_timer_list))
1504                         snd_timer_user_zero_id(&id);
1505                 else {
1506                         timer = list_entry(snd_timer_list.next,
1507                                            struct snd_timer, device_list);
1508                         snd_timer_user_copy_id(&id, timer);
1509                 }
1510         } else {
1511                 switch (id.dev_class) {
1512                 case SNDRV_TIMER_CLASS_GLOBAL:
1513                         id.device = id.device < 0 ? 0 : id.device + 1;
1514                         list_for_each(p, &snd_timer_list) {
1515                                 timer = list_entry(p, struct snd_timer, device_list);
1516                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1517                                         snd_timer_user_copy_id(&id, timer);
1518                                         break;
1519                                 }
1520                                 if (timer->tmr_device >= id.device) {
1521                                         snd_timer_user_copy_id(&id, timer);
1522                                         break;
1523                                 }
1524                         }
1525                         if (p == &snd_timer_list)
1526                                 snd_timer_user_zero_id(&id);
1527                         break;
1528                 case SNDRV_TIMER_CLASS_CARD:
1529                 case SNDRV_TIMER_CLASS_PCM:
1530                         if (id.card < 0) {
1531                                 id.card = 0;
1532                         } else {
1533                                 if (id.device < 0) {
1534                                         id.device = 0;
1535                                 } else {
1536                                         if (id.subdevice < 0)
1537                                                 id.subdevice = 0;
1538                                         else if (id.subdevice < INT_MAX)
1539                                                 id.subdevice++;
1540                                 }
1541                         }
1542                         list_for_each(p, &snd_timer_list) {
1543                                 timer = list_entry(p, struct snd_timer, device_list);
1544                                 if (timer->tmr_class > id.dev_class) {
1545                                         snd_timer_user_copy_id(&id, timer);
1546                                         break;
1547                                 }
1548                                 if (timer->tmr_class < id.dev_class)
1549                                         continue;
1550                                 if (timer->card->number > id.card) {
1551                                         snd_timer_user_copy_id(&id, timer);
1552                                         break;
1553                                 }
1554                                 if (timer->card->number < id.card)
1555                                         continue;
1556                                 if (timer->tmr_device > id.device) {
1557                                         snd_timer_user_copy_id(&id, timer);
1558                                         break;
1559                                 }
1560                                 if (timer->tmr_device < id.device)
1561                                         continue;
1562                                 if (timer->tmr_subdevice > id.subdevice) {
1563                                         snd_timer_user_copy_id(&id, timer);
1564                                         break;
1565                                 }
1566                                 if (timer->tmr_subdevice < id.subdevice)
1567                                         continue;
1568                                 snd_timer_user_copy_id(&id, timer);
1569                                 break;
1570                         }
1571                         if (p == &snd_timer_list)
1572                                 snd_timer_user_zero_id(&id);
1573                         break;
1574                 default:
1575                         snd_timer_user_zero_id(&id);
1576                 }
1577         }
1578         mutex_unlock(&register_mutex);
1579         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1580                 return -EFAULT;
1581         return 0;
1582 }
1583
1584 static int snd_timer_user_ginfo(struct file *file,
1585                                 struct snd_timer_ginfo __user *_ginfo)
1586 {
1587         struct snd_timer_ginfo *ginfo;
1588         struct snd_timer_id tid;
1589         struct snd_timer *t;
1590         struct list_head *p;
1591         int err = 0;
1592
1593         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1594         if (IS_ERR(ginfo))
1595                 return PTR_ERR(ginfo);
1596
1597         tid = ginfo->tid;
1598         memset(ginfo, 0, sizeof(*ginfo));
1599         ginfo->tid = tid;
1600         mutex_lock(&register_mutex);
1601         t = snd_timer_find(&tid);
1602         if (t != NULL) {
1603                 ginfo->card = t->card ? t->card->number : -1;
1604                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1605                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1606                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1607                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1608                 ginfo->resolution = t->hw.resolution;
1609                 if (t->hw.resolution_min > 0) {
1610                         ginfo->resolution_min = t->hw.resolution_min;
1611                         ginfo->resolution_max = t->hw.resolution_max;
1612                 }
1613                 list_for_each(p, &t->open_list_head) {
1614                         ginfo->clients++;
1615                 }
1616         } else {
1617                 err = -ENODEV;
1618         }
1619         mutex_unlock(&register_mutex);
1620         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1621                 err = -EFAULT;
1622         kfree(ginfo);
1623         return err;
1624 }
1625
1626 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1627 {
1628         struct snd_timer *t;
1629         int err;
1630
1631         mutex_lock(&register_mutex);
1632         t = snd_timer_find(&gparams->tid);
1633         if (!t) {
1634                 err = -ENODEV;
1635                 goto _error;
1636         }
1637         if (!list_empty(&t->open_list_head)) {
1638                 err = -EBUSY;
1639                 goto _error;
1640         }
1641         if (!t->hw.set_period) {
1642                 err = -ENOSYS;
1643                 goto _error;
1644         }
1645         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1646 _error:
1647         mutex_unlock(&register_mutex);
1648         return err;
1649 }
1650
1651 static int snd_timer_user_gparams(struct file *file,
1652                                   struct snd_timer_gparams __user *_gparams)
1653 {
1654         struct snd_timer_gparams gparams;
1655
1656         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1657                 return -EFAULT;
1658         return timer_set_gparams(&gparams);
1659 }
1660
1661 static int snd_timer_user_gstatus(struct file *file,
1662                                   struct snd_timer_gstatus __user *_gstatus)
1663 {
1664         struct snd_timer_gstatus gstatus;
1665         struct snd_timer_id tid;
1666         struct snd_timer *t;
1667         int err = 0;
1668
1669         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1670                 return -EFAULT;
1671         tid = gstatus.tid;
1672         memset(&gstatus, 0, sizeof(gstatus));
1673         gstatus.tid = tid;
1674         mutex_lock(&register_mutex);
1675         t = snd_timer_find(&tid);
1676         if (t != NULL) {
1677                 if (t->hw.c_resolution)
1678                         gstatus.resolution = t->hw.c_resolution(t);
1679                 else
1680                         gstatus.resolution = t->hw.resolution;
1681                 if (t->hw.precise_resolution) {
1682                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1683                                                  &gstatus.resolution_den);
1684                 } else {
1685                         gstatus.resolution_num = gstatus.resolution;
1686                         gstatus.resolution_den = 1000000000uL;
1687                 }
1688         } else {
1689                 err = -ENODEV;
1690         }
1691         mutex_unlock(&register_mutex);
1692         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1693                 err = -EFAULT;
1694         return err;
1695 }
1696
1697 static int snd_timer_user_tselect(struct file *file,
1698                                   struct snd_timer_select __user *_tselect)
1699 {
1700         struct snd_timer_user *tu;
1701         struct snd_timer_select tselect;
1702         char str[32];
1703         int err = 0;
1704
1705         tu = file->private_data;
1706         if (tu->timeri) {
1707                 snd_timer_close(tu->timeri);
1708                 tu->timeri = NULL;
1709         }
1710         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1711                 err = -EFAULT;
1712                 goto __err;
1713         }
1714         sprintf(str, "application %i", current->pid);
1715         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1716                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1717         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1718         if (err < 0)
1719                 goto __err;
1720
1721         tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1722         tu->timeri->callback = tu->tread
1723                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1724         tu->timeri->ccallback = snd_timer_user_ccallback;
1725         tu->timeri->callback_data = (void *)tu;
1726         tu->timeri->disconnect = snd_timer_user_disconnect;
1727
1728       __err:
1729         return err;
1730 }
1731
1732 static int snd_timer_user_info(struct file *file,
1733                                struct snd_timer_info __user *_info)
1734 {
1735         struct snd_timer_user *tu;
1736         struct snd_timer_info *info;
1737         struct snd_timer *t;
1738         int err = 0;
1739
1740         tu = file->private_data;
1741         if (!tu->timeri)
1742                 return -EBADFD;
1743         t = tu->timeri->timer;
1744         if (!t)
1745                 return -EBADFD;
1746
1747         info = kzalloc(sizeof(*info), GFP_KERNEL);
1748         if (! info)
1749                 return -ENOMEM;
1750         info->card = t->card ? t->card->number : -1;
1751         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1752                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1753         strlcpy(info->id, t->id, sizeof(info->id));
1754         strlcpy(info->name, t->name, sizeof(info->name));
1755         info->resolution = t->hw.resolution;
1756         if (copy_to_user(_info, info, sizeof(*_info)))
1757                 err = -EFAULT;
1758         kfree(info);
1759         return err;
1760 }
1761
1762 static int snd_timer_user_params(struct file *file,
1763                                  struct snd_timer_params __user *_params)
1764 {
1765         struct snd_timer_user *tu;
1766         struct snd_timer_params params;
1767         struct snd_timer *t;
1768         int err;
1769
1770         tu = file->private_data;
1771         if (!tu->timeri)
1772                 return -EBADFD;
1773         t = tu->timeri->timer;
1774         if (!t)
1775                 return -EBADFD;
1776         if (copy_from_user(&params, _params, sizeof(params)))
1777                 return -EFAULT;
1778         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1779                 u64 resolution;
1780
1781                 if (params.ticks < 1) {
1782                         err = -EINVAL;
1783                         goto _end;
1784                 }
1785
1786                 /* Don't allow resolution less than 1ms */
1787                 resolution = snd_timer_resolution(tu->timeri);
1788                 resolution *= params.ticks;
1789                 if (resolution < 1000000) {
1790                         err = -EINVAL;
1791                         goto _end;
1792                 }
1793         }
1794         if (params.queue_size > 0 &&
1795             (params.queue_size < 32 || params.queue_size > 1024)) {
1796                 err = -EINVAL;
1797                 goto _end;
1798         }
1799         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1800                               (1<<SNDRV_TIMER_EVENT_TICK)|
1801                               (1<<SNDRV_TIMER_EVENT_START)|
1802                               (1<<SNDRV_TIMER_EVENT_STOP)|
1803                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1804                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1805                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1806                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1807                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1808                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1809                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1810                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1811                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1812                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1813                 err = -EINVAL;
1814                 goto _end;
1815         }
1816         snd_timer_stop(tu->timeri);
1817         spin_lock_irq(&t->lock);
1818         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1819                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1820                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1821         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1822                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1823         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1824                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1825         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1826                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1827         spin_unlock_irq(&t->lock);
1828         if (params.queue_size > 0 &&
1829             (unsigned int)tu->queue_size != params.queue_size) {
1830                 err = realloc_user_queue(tu, params.queue_size);
1831                 if (err < 0)
1832                         goto _end;
1833         }
1834         spin_lock_irq(&tu->qlock);
1835         tu->qhead = tu->qtail = tu->qused = 0;
1836         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1837                 if (tu->tread) {
1838                         struct snd_timer_tread tread;
1839                         memset(&tread, 0, sizeof(tread));
1840                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1841                         tread.tstamp.tv_sec = 0;
1842                         tread.tstamp.tv_nsec = 0;
1843                         tread.val = 0;
1844                         snd_timer_user_append_to_tqueue(tu, &tread);
1845                 } else {
1846                         struct snd_timer_read *r = &tu->queue[0];
1847                         r->resolution = 0;
1848                         r->ticks = 0;
1849                         tu->qused++;
1850                         tu->qtail++;
1851                 }
1852         }
1853         tu->filter = params.filter;
1854         tu->ticks = params.ticks;
1855         spin_unlock_irq(&tu->qlock);
1856         err = 0;
1857  _end:
1858         if (copy_to_user(_params, &params, sizeof(params)))
1859                 return -EFAULT;
1860         return err;
1861 }
1862
1863 static int snd_timer_user_status(struct file *file,
1864                                  struct snd_timer_status __user *_status)
1865 {
1866         struct snd_timer_user *tu;
1867         struct snd_timer_status status;
1868
1869         tu = file->private_data;
1870         if (!tu->timeri)
1871                 return -EBADFD;
1872         memset(&status, 0, sizeof(status));
1873         status.tstamp = tu->tstamp;
1874         status.resolution = snd_timer_resolution(tu->timeri);
1875         status.lost = tu->timeri->lost;
1876         status.overrun = tu->overrun;
1877         spin_lock_irq(&tu->qlock);
1878         status.queue = tu->qused;
1879         spin_unlock_irq(&tu->qlock);
1880         if (copy_to_user(_status, &status, sizeof(status)))
1881                 return -EFAULT;
1882         return 0;
1883 }
1884
1885 static int snd_timer_user_start(struct file *file)
1886 {
1887         int err;
1888         struct snd_timer_user *tu;
1889
1890         tu = file->private_data;
1891         if (!tu->timeri)
1892                 return -EBADFD;
1893         snd_timer_stop(tu->timeri);
1894         tu->timeri->lost = 0;
1895         tu->last_resolution = 0;
1896         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1897 }
1898
1899 static int snd_timer_user_stop(struct file *file)
1900 {
1901         int err;
1902         struct snd_timer_user *tu;
1903
1904         tu = file->private_data;
1905         if (!tu->timeri)
1906                 return -EBADFD;
1907         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1908 }
1909
1910 static int snd_timer_user_continue(struct file *file)
1911 {
1912         int err;
1913         struct snd_timer_user *tu;
1914
1915         tu = file->private_data;
1916         if (!tu->timeri)
1917                 return -EBADFD;
1918         /* start timer instead of continue if it's not used before */
1919         if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1920                 return snd_timer_user_start(file);
1921         tu->timeri->lost = 0;
1922         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1923 }
1924
1925 static int snd_timer_user_pause(struct file *file)
1926 {
1927         int err;
1928         struct snd_timer_user *tu;
1929
1930         tu = file->private_data;
1931         if (!tu->timeri)
1932                 return -EBADFD;
1933         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1934 }
1935
1936 enum {
1937         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1938         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1939         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1940         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1941 };
1942
1943 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1944                                  unsigned long arg)
1945 {
1946         struct snd_timer_user *tu;
1947         void __user *argp = (void __user *)arg;
1948         int __user *p = argp;
1949
1950         tu = file->private_data;
1951         switch (cmd) {
1952         case SNDRV_TIMER_IOCTL_PVERSION:
1953                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1954         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1955                 return snd_timer_user_next_device(argp);
1956         case SNDRV_TIMER_IOCTL_TREAD:
1957         {
1958                 int xarg, old_tread;
1959
1960                 if (tu->timeri) /* too late */
1961                         return -EBUSY;
1962                 if (get_user(xarg, p))
1963                         return -EFAULT;
1964                 old_tread = tu->tread;
1965                 tu->tread = xarg ? 1 : 0;
1966                 if (tu->tread != old_tread &&
1967                     realloc_user_queue(tu, tu->queue_size) < 0) {
1968                         tu->tread = old_tread;
1969                         return -ENOMEM;
1970                 }
1971                 return 0;
1972         }
1973         case SNDRV_TIMER_IOCTL_GINFO:
1974                 return snd_timer_user_ginfo(file, argp);
1975         case SNDRV_TIMER_IOCTL_GPARAMS:
1976                 return snd_timer_user_gparams(file, argp);
1977         case SNDRV_TIMER_IOCTL_GSTATUS:
1978                 return snd_timer_user_gstatus(file, argp);
1979         case SNDRV_TIMER_IOCTL_SELECT:
1980                 return snd_timer_user_tselect(file, argp);
1981         case SNDRV_TIMER_IOCTL_INFO:
1982                 return snd_timer_user_info(file, argp);
1983         case SNDRV_TIMER_IOCTL_PARAMS:
1984                 return snd_timer_user_params(file, argp);
1985         case SNDRV_TIMER_IOCTL_STATUS:
1986                 return snd_timer_user_status(file, argp);
1987         case SNDRV_TIMER_IOCTL_START:
1988         case SNDRV_TIMER_IOCTL_START_OLD:
1989                 return snd_timer_user_start(file);
1990         case SNDRV_TIMER_IOCTL_STOP:
1991         case SNDRV_TIMER_IOCTL_STOP_OLD:
1992                 return snd_timer_user_stop(file);
1993         case SNDRV_TIMER_IOCTL_CONTINUE:
1994         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1995                 return snd_timer_user_continue(file);
1996         case SNDRV_TIMER_IOCTL_PAUSE:
1997         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1998                 return snd_timer_user_pause(file);
1999         }
2000         return -ENOTTY;
2001 }
2002
2003 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2004                                  unsigned long arg)
2005 {
2006         struct snd_timer_user *tu = file->private_data;
2007         long ret;
2008
2009         mutex_lock(&tu->ioctl_lock);
2010         ret = __snd_timer_user_ioctl(file, cmd, arg);
2011         mutex_unlock(&tu->ioctl_lock);
2012         return ret;
2013 }
2014
2015 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2016 {
2017         struct snd_timer_user *tu;
2018
2019         tu = file->private_data;
2020         return fasync_helper(fd, file, on, &tu->fasync);
2021 }
2022
2023 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2024                                    size_t count, loff_t *offset)
2025 {
2026         struct snd_timer_user *tu;
2027         long result = 0, unit;
2028         int qhead;
2029         int err = 0;
2030
2031         tu = file->private_data;
2032         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2033         mutex_lock(&tu->ioctl_lock);
2034         spin_lock_irq(&tu->qlock);
2035         while ((long)count - result >= unit) {
2036                 while (!tu->qused) {
2037                         wait_queue_entry_t wait;
2038
2039                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2040                                 err = -EAGAIN;
2041                                 goto _error;
2042                         }
2043
2044                         set_current_state(TASK_INTERRUPTIBLE);
2045                         init_waitqueue_entry(&wait, current);
2046                         add_wait_queue(&tu->qchange_sleep, &wait);
2047
2048                         spin_unlock_irq(&tu->qlock);
2049                         mutex_unlock(&tu->ioctl_lock);
2050                         schedule();
2051                         mutex_lock(&tu->ioctl_lock);
2052                         spin_lock_irq(&tu->qlock);
2053
2054                         remove_wait_queue(&tu->qchange_sleep, &wait);
2055
2056                         if (tu->disconnected) {
2057                                 err = -ENODEV;
2058                                 goto _error;
2059                         }
2060                         if (signal_pending(current)) {
2061                                 err = -ERESTARTSYS;
2062                                 goto _error;
2063                         }
2064                 }
2065
2066                 qhead = tu->qhead++;
2067                 tu->qhead %= tu->queue_size;
2068                 tu->qused--;
2069                 spin_unlock_irq(&tu->qlock);
2070
2071                 if (tu->tread) {
2072                         if (copy_to_user(buffer, &tu->tqueue[qhead],
2073                                          sizeof(struct snd_timer_tread)))
2074                                 err = -EFAULT;
2075                 } else {
2076                         if (copy_to_user(buffer, &tu->queue[qhead],
2077                                          sizeof(struct snd_timer_read)))
2078                                 err = -EFAULT;
2079                 }
2080
2081                 spin_lock_irq(&tu->qlock);
2082                 if (err < 0)
2083                         goto _error;
2084                 result += unit;
2085                 buffer += unit;
2086         }
2087  _error:
2088         spin_unlock_irq(&tu->qlock);
2089         mutex_unlock(&tu->ioctl_lock);
2090         return result > 0 ? result : err;
2091 }
2092
2093 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2094 {
2095         unsigned int mask;
2096         struct snd_timer_user *tu;
2097
2098         tu = file->private_data;
2099
2100         poll_wait(file, &tu->qchange_sleep, wait);
2101
2102         mask = 0;
2103         spin_lock_irq(&tu->qlock);
2104         if (tu->qused)
2105                 mask |= POLLIN | POLLRDNORM;
2106         if (tu->disconnected)
2107                 mask |= POLLERR;
2108         spin_unlock_irq(&tu->qlock);
2109
2110         return mask;
2111 }
2112
2113 #ifdef CONFIG_COMPAT
2114 #include "timer_compat.c"
2115 #else
2116 #define snd_timer_user_ioctl_compat     NULL
2117 #endif
2118
2119 static const struct file_operations snd_timer_f_ops =
2120 {
2121         .owner =        THIS_MODULE,
2122         .read =         snd_timer_user_read,
2123         .open =         snd_timer_user_open,
2124         .release =      snd_timer_user_release,
2125         .llseek =       no_llseek,
2126         .poll =         snd_timer_user_poll,
2127         .unlocked_ioctl =       snd_timer_user_ioctl,
2128         .compat_ioctl = snd_timer_user_ioctl_compat,
2129         .fasync =       snd_timer_user_fasync,
2130 };
2131
2132 /* unregister the system timer */
2133 static void snd_timer_free_all(void)
2134 {
2135         struct snd_timer *timer, *n;
2136
2137         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2138                 snd_timer_free(timer);
2139 }
2140
2141 static struct device timer_dev;
2142
2143 /*
2144  *  ENTRY functions
2145  */
2146
2147 static int __init alsa_timer_init(void)
2148 {
2149         int err;
2150
2151         snd_device_initialize(&timer_dev, NULL);
2152         dev_set_name(&timer_dev, "timer");
2153
2154 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2155         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2156                               "system timer");
2157 #endif
2158
2159         err = snd_timer_register_system();
2160         if (err < 0) {
2161                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2162                 goto put_timer;
2163         }
2164
2165         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2166                                   &snd_timer_f_ops, NULL, &timer_dev);
2167         if (err < 0) {
2168                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2169                 snd_timer_free_all();
2170                 goto put_timer;
2171         }
2172
2173         snd_timer_proc_init();
2174         return 0;
2175
2176 put_timer:
2177         put_device(&timer_dev);
2178         return err;
2179 }
2180
2181 static void __exit alsa_timer_exit(void)
2182 {
2183         snd_unregister_device(&timer_dev);
2184         snd_timer_free_all();
2185         put_device(&timer_dev);
2186         snd_timer_proc_done();
2187 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2188         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2189 #endif
2190 }
2191
2192 module_init(alsa_timer_init)
2193 module_exit(alsa_timer_exit)