sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) 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/mm.h>
  23 #include <linux/module.h>
  24 #include <linux/file.h>
  25 #include <linux/slab.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/time.h>
  28 #include <linux/pm_qos.h>
  29 #include <linux/io.h>
  30 #include <linux/dma-mapping.h>
  31 #include <sound/core.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/timer.h>
  37 #include <sound/minors.h>
  38 #include <linux/uio.h>
  39 #include <linux/delay.h>
  40
  41 #include "pcm_local.h"
  42
  43 #ifdef CONFIG_SND_DEBUG
  44 #define CREATE_TRACE_POINTS
  45 #include "pcm_param_trace.h"
  46 #else
  47 #define trace_hw_mask_param_enabled()           0
  48 #define trace_hw_interval_param_enabled()       0
  49 #define trace_hw_mask_param(substream, type, index, prev, curr)
  50 #define trace_hw_interval_param(substream, type, index, prev, curr)
  51 #endif
  52
  53 /*
  54  *  Compatibility
  55  */
  56
  57 struct snd_pcm_hw_params_old {
  58         unsigned int flags;
  59         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  60                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  61         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  62                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  63         unsigned int rmask;
  64         unsigned int cmask;
  65         unsigned int info;
  66         unsigned int msbits;
  67         unsigned int rate_num;
  68         unsigned int rate_den;
  69         snd_pcm_uframes_t fifo_size;
  70         unsigned char reserved[64];
  71 };
  72
  73 #ifdef CONFIG_SND_SUPPORT_OLD_API
  74 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  75 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  76
  77 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  78                                       struct snd_pcm_hw_params_old __user * _oparams);
  79 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  80                                       struct snd_pcm_hw_params_old __user * _oparams);
  81 #endif
  82 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  83
  84 /*
  85  *
  86  */
  87
  88 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
  89 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  90
  91 /* Writer in rwsem may block readers even during its waiting in queue,
  92  * and this may lead to a deadlock when the code path takes read sem
  93  * twice (e.g. one in snd_pcm_action_nonatomic() and another in
  94  * snd_pcm_stream_lock()).  As a (suboptimal) workaround, let writer to
  95  * sleep until all the readers are completed without blocking by writer.
  96  */
  97 static inline void down_write_nonfifo(struct rw_semaphore *lock)
  98 {
  99         while (!down_write_trylock(lock))
 100                 msleep(1);
 101 }
 102
 103 #define PCM_LOCK_DEFAULT        0
 104 #define PCM_LOCK_IRQ    1
 105 #define PCM_LOCK_IRQSAVE        2
 106
 107 static unsigned long __snd_pcm_stream_lock_mode(struct snd_pcm_substream *substream,
 108                                                 unsigned int mode)
 109 {
 110         unsigned long flags = 0;
 111         if (substream->pcm->nonatomic) {
 112                 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
 113                 mutex_lock(&substream->self_group.mutex);
 114         } else {
 115                 switch (mode) {
 116                 case PCM_LOCK_DEFAULT:
 117                         read_lock(&snd_pcm_link_rwlock);
 118                         break;
 119                 case PCM_LOCK_IRQ:
 120                         read_lock_irq(&snd_pcm_link_rwlock);
 121                         break;
 122                 case PCM_LOCK_IRQSAVE:
 123                         read_lock_irqsave(&snd_pcm_link_rwlock, flags);
 124                         break;
 125                 }
 126                 spin_lock(&substream->self_group.lock);
 127         }
 128         return flags;
 129 }
 130
 131 static void __snd_pcm_stream_unlock_mode(struct snd_pcm_substream *substream,
 132                                          unsigned int mode, unsigned long flags)
 133 {
 134         if (substream->pcm->nonatomic) {
 135                 mutex_unlock(&substream->self_group.mutex);
 136                 up_read(&snd_pcm_link_rwsem);
 137         } else {
 138                 spin_unlock(&substream->self_group.lock);
 139
 140                 switch (mode) {
 141                 case PCM_LOCK_DEFAULT:
 142                         read_unlock(&snd_pcm_link_rwlock);
 143                         break;
 144                 case PCM_LOCK_IRQ:
 145                         read_unlock_irq(&snd_pcm_link_rwlock);
 146                         break;
 147                 case PCM_LOCK_IRQSAVE:
 148                         read_unlock_irqrestore(&snd_pcm_link_rwlock, flags);
 149                         break;
 150                 }
 151         }
 152 }
 153
 154 /**
 155  * snd_pcm_stream_lock - Lock the PCM stream
 156  * @substream: PCM substream
 157  *
 158  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 159  * flag of the given substream.  This also takes the global link rw lock
 160  * (or rw sem), too, for avoiding the race with linked streams.
 161  */
 162 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 163 {
 164         __snd_pcm_stream_lock_mode(substream, PCM_LOCK_DEFAULT);
 165 }
 166 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
 167
 168 /**
 169  * snd_pcm_stream_lock - Unlock the PCM stream
 170  * @substream: PCM substream
 171  *
 172  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
 173  */
 174 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 175 {
 176         __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_DEFAULT, 0);
 177 }
 178 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
 179
 180 /**
 181  * snd_pcm_stream_lock_irq - Lock the PCM stream
 182  * @substream: PCM substream
 183  *
 184  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
 185  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 186  * as snd_pcm_stream_lock().
 187  */
 188 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 189 {
 190         __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQ);
 191 }
 192 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
 193
 194 /**
 195  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 196  * @substream: PCM substream
 197  *
 198  * This is a counter-part of snd_pcm_stream_lock_irq().
 199  */
 200 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 201 {
 202         __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQ, 0);
 203 }
 204 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
 205
 206 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
 207 {
 208         return __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQSAVE);
 209 }
 210 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
 211
 212 /**
 213  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
 214  * @substream: PCM substream
 215  * @flags: irq flags
 216  *
 217  * This is a counter-part of snd_pcm_stream_lock_irqsave().
 218  */
 219 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 220                                       unsigned long flags)
 221 {
 222         __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQSAVE, flags);
 223 }
 224 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
 225
 226 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
 227 {
 228         struct snd_pcm *pcm = substream->pcm;
 229         struct snd_pcm_str *pstr = substream->pstr;
 230
 231         memset(info, 0, sizeof(*info));
 232         info->card = pcm->card->number;
 233         info->device = pcm->device;
 234         info->stream = substream->stream;
 235         info->subdevice = substream->number;
 236         strlcpy(info->id, pcm->id, sizeof(info->id));
 237         strlcpy(info->name, pcm->name, sizeof(info->name));
 238         info->dev_class = pcm->dev_class;
 239         info->dev_subclass = pcm->dev_subclass;
 240         info->subdevices_count = pstr->substream_count;
 241         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 242         strlcpy(info->subname, substream->name, sizeof(info->subname));
 243
 244         return 0;
 245 }
 246
 247 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 248                       struct snd_pcm_info __user * _info)
 249 {
 250         struct snd_pcm_info *info;
 251         int err;
 252
 253         info = kmalloc(sizeof(*info), GFP_KERNEL);
 254         if (! info)
 255                 return -ENOMEM;
 256         err = snd_pcm_info(substream, info);
 257         if (err >= 0) {
 258                 if (copy_to_user(_info, info, sizeof(*info)))
 259                         err = -EFAULT;
 260         }
 261         kfree(info);
 262         return err;
 263 }
 264
 265 static bool hw_support_mmap(struct snd_pcm_substream *substream)
 266 {
 267         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 268                 return false;
 269         /* architecture supports dma_mmap_coherent()? */
 270 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA)
 271         if (!substream->ops->mmap &&
 272             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
 273                 return false;
 274 #endif
 275         return true;
 276 }
 277
 278 static int constrain_mask_params(struct snd_pcm_substream *substream,
 279                                  struct snd_pcm_hw_params *params)
 280 {
 281         struct snd_pcm_hw_constraints *constrs =
 282                                         &substream->runtime->hw_constraints;
 283         struct snd_mask *m;
 284         unsigned int k;
 285         struct snd_mask old_mask;
 286         int changed;
 287
 288         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 289                 m = hw_param_mask(params, k);
 290                 if (snd_mask_empty(m))
 291                         return -EINVAL;
 292
 293                 /* This parameter is not requested to change by a caller. */
 294                 if (!(params->rmask & (1 << k)))
 295                         continue;
 296
 297                 if (trace_hw_mask_param_enabled())
 298                         old_mask = *m;
 299
 300                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 301                 if (changed < 0)
 302                         return changed;
 303                 if (changed == 0)
 304                         continue;
 305
 306                 /* Set corresponding flag so that the caller gets it. */
 307                 trace_hw_mask_param(substream, k, 0, &old_mask, m);
 308                 params->cmask |= 1 << k;
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int constrain_interval_params(struct snd_pcm_substream *substream,
 315                                      struct snd_pcm_hw_params *params)
 316 {
 317         struct snd_pcm_hw_constraints *constrs =
 318                                         &substream->runtime->hw_constraints;
 319         struct snd_interval *i;
 320         unsigned int k;
 321         struct snd_interval old_interval;
 322         int changed;
 323
 324         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 325                 i = hw_param_interval(params, k);
 326                 if (snd_interval_empty(i))
 327                         return -EINVAL;
 328
 329                 /* This parameter is not requested to change by a caller. */
 330                 if (!(params->rmask & (1 << k)))
 331                         continue;
 332
 333                 if (trace_hw_interval_param_enabled())
 334                         old_interval = *i;
 335
 336                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 337                 if (changed < 0)
 338                         return changed;
 339                 if (changed == 0)
 340                         continue;
 341
 342                 /* Set corresponding flag so that the caller gets it. */
 343                 trace_hw_interval_param(substream, k, 0, &old_interval, i);
 344                 params->cmask |= 1 << k;
 345         }
 346
 347         return 0;
 348 }
 349
 350 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
 351                                      struct snd_pcm_hw_params *params)
 352 {
 353         struct snd_pcm_hw_constraints *constrs =
 354                                         &substream->runtime->hw_constraints;
 355         unsigned int k;
 356         unsigned int *rstamps;
 357         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 358         unsigned int stamp;
 359         struct snd_pcm_hw_rule *r;
 360         unsigned int d;
 361         struct snd_mask old_mask;
 362         struct snd_interval old_interval;
 363         bool again;
 364         int changed, err = 0;
 365
 366         /*
 367          * Each application of rule has own sequence number.
 368          *
 369          * Each member of 'rstamps' array represents the sequence number of
 370          * recent application of corresponding rule.
 371          */
 372         rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
 373         if (!rstamps)
 374                 return -ENOMEM;
 375
 376         /*
 377          * Each member of 'vstamps' array represents the sequence number of
 378          * recent application of rule in which corresponding parameters were
 379          * changed.
 380          *
 381          * In initial state, elements corresponding to parameters requested by
 382          * a caller is 1. For unrequested parameters, corresponding members
 383          * have 0 so that the parameters are never changed anymore.
 384          */
 385         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 386                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 387
 388         /* Due to the above design, actual sequence number starts at 2. */
 389         stamp = 2;
 390 retry:
 391         /* Apply all rules in order. */
 392         again = false;
 393         for (k = 0; k < constrs->rules_num; k++) {
 394                 r = &constrs->rules[k];
 395
 396                 /*
 397                  * Check condition bits of this rule. When the rule has
 398                  * some condition bits, parameter without the bits is
 399                  * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
 400                  * is an example of the condition bits.
 401                  */
 402                 if (r->cond && !(r->cond & params->flags))
 403                         continue;
 404
 405                 /*
 406                  * The 'deps' array includes maximum three dependencies
 407                  * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
 408                  * member of this array is a sentinel and should be
 409                  * negative value.
 410                  *
 411                  * This rule should be processed in this time when dependent
 412                  * parameters were changed at former applications of the other
 413                  * rules.
 414                  */
 415                 for (d = 0; r->deps[d] >= 0; d++) {
 416                         if (vstamps[r->deps[d]] > rstamps[k])
 417                                 break;
 418                 }
 419                 if (r->deps[d] < 0)
 420                         continue;
 421
 422                 if (trace_hw_mask_param_enabled()) {
 423                         if (hw_is_mask(r->var))
 424                                 old_mask = *hw_param_mask(params, r->var);
 425                 }
 426                 if (trace_hw_interval_param_enabled()) {
 427                         if (hw_is_interval(r->var))
 428                                 old_interval = *hw_param_interval(params, r->var);
 429                 }
 430
 431                 changed = r->func(params, r);
 432                 if (changed < 0) {
 433                         err = changed;
 434                         goto out;
 435                 }
 436
 437                 /*
 438                  * When the parameter is changed, notify it to the caller
 439                  * by corresponding returned bit, then preparing for next
 440                  * iteration.
 441                  */
 442                 if (changed && r->var >= 0) {
 443                         if (hw_is_mask(r->var)) {
 444                                 trace_hw_mask_param(substream, r->var,
 445                                         k + 1, &old_mask,
 446                                         hw_param_mask(params, r->var));
 447                         }
 448                         if (hw_is_interval(r->var)) {
 449                                 trace_hw_interval_param(substream, r->var,
 450                                         k + 1, &old_interval,
 451                                         hw_param_interval(params, r->var));
 452                         }
 453
 454                         params->cmask |= (1 << r->var);
 455                         vstamps[r->var] = stamp;
 456                         again = true;
 457                 }
 458
 459                 rstamps[k] = stamp++;
 460         }
 461
 462         /* Iterate to evaluate all rules till no parameters are changed. */
 463         if (again)
 464                 goto retry;
 465
 466  out:
 467         kfree(rstamps);
 468         return err;
 469 }
 470
 471 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
 472                                      struct snd_pcm_hw_params *params)
 473 {
 474         const struct snd_interval *i;
 475         const struct snd_mask *m;
 476         int err;
 477
 478         if (!params->msbits) {
 479                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 480                 if (snd_interval_single(i))
 481                         params->msbits = snd_interval_value(i);
 482         }
 483
 484         if (!params->rate_den) {
 485                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 486                 if (snd_interval_single(i)) {
 487                         params->rate_num = snd_interval_value(i);
 488                         params->rate_den = 1;
 489                 }
 490         }
 491
 492         if (!params->fifo_size) {
 493                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 494                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 495                 if (snd_mask_single(m) && snd_interval_single(i)) {
 496                         err = substream->ops->ioctl(substream,
 497                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 498                         if (err < 0)
 499                                 return err;
 500                 }
 501         }
 502
 503         if (!params->info) {
 504                 params->info = substream->runtime->hw.info;
 505                 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
 506                                   SNDRV_PCM_INFO_DRAIN_TRIGGER);
 507                 if (!hw_support_mmap(substream))
 508                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
 509                                           SNDRV_PCM_INFO_MMAP_VALID);
 510         }
 511
 512         return 0;
 513 }
 514
 515 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 516                       struct snd_pcm_hw_params *params)
 517 {
 518         int err;
 519
 520         params->info = 0;
 521         params->fifo_size = 0;
 522         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 523                 params->msbits = 0;
 524         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 525                 params->rate_num = 0;
 526                 params->rate_den = 0;
 527         }
 528
 529         err = constrain_mask_params(substream, params);
 530         if (err < 0)
 531                 return err;
 532
 533         err = constrain_interval_params(substream, params);
 534         if (err < 0)
 535                 return err;
 536
 537         err = constrain_params_by_rules(substream, params);
 538         if (err < 0)
 539                 return err;
 540
 541         params->rmask = 0;
 542
 543         return 0;
 544 }
 545 EXPORT_SYMBOL(snd_pcm_hw_refine);
 546
 547 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 548                                   struct snd_pcm_hw_params __user * _params)
 549 {
 550         struct snd_pcm_hw_params *params;
 551         int err;
 552
 553         params = memdup_user(_params, sizeof(*params));
 554         if (IS_ERR(params))
 555                 return PTR_ERR(params);
 556
 557         err = snd_pcm_hw_refine(substream, params);
 558         if (err < 0)
 559                 goto end;
 560
 561         err = fixup_unreferenced_params(substream, params);
 562         if (err < 0)
 563                 goto end;
 564
 565         if (copy_to_user(_params, params, sizeof(*params)))
 566                 err = -EFAULT;
 567 end:
 568         kfree(params);
 569         return err;
 570 }
 571
 572 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 573 {
 574         int usecs;
 575
 576         if (! runtime->rate)
 577                 return -1; /* invalid */
 578
 579         /* take 75% of period time as the deadline */
 580         usecs = (750000 / runtime->rate) * runtime->period_size;
 581         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 582                 runtime->rate;
 583
 584         return usecs;
 585 }
 586
 587 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
 588 {
 589         snd_pcm_stream_lock_irq(substream);
 590         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
 591                 substream->runtime->status->state = state;
 592         snd_pcm_stream_unlock_irq(substream);
 593 }
 594
 595 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
 596                                         int event)
 597 {
 598 #ifdef CONFIG_SND_PCM_TIMER
 599         if (substream->timer)
 600                 snd_timer_notify(substream->timer, event,
 601                                         &substream->runtime->trigger_tstamp);
 602 #endif
 603 }
 604
 605 /**
 606  * snd_pcm_hw_param_choose - choose a configuration defined by @params
 607  * @pcm: PCM instance
 608  * @params: the hw_params instance
 609  *
 610  * Choose one configuration from configuration space defined by @params.
 611  * The configuration chosen is that obtained fixing in this order:
 612  * first access, first format, first subformat, min channels,
 613  * min rate, min period time, max buffer size, min tick time
 614  *
 615  * Return: Zero if successful, or a negative error code on failure.
 616  */
 617 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
 618                                     struct snd_pcm_hw_params *params)
 619 {
 620         static const int vars[] = {
 621                 SNDRV_PCM_HW_PARAM_ACCESS,
 622                 SNDRV_PCM_HW_PARAM_FORMAT,
 623                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
 624                 SNDRV_PCM_HW_PARAM_CHANNELS,
 625                 SNDRV_PCM_HW_PARAM_RATE,
 626                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 627                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 628                 SNDRV_PCM_HW_PARAM_TICK_TIME,
 629                 -1
 630         };
 631         const int *v;
 632         struct snd_mask old_mask;
 633         struct snd_interval old_interval;
 634         int changed;
 635
 636         for (v = vars; *v != -1; v++) {
 637                 /* Keep old parameter to trace. */
 638                 if (trace_hw_mask_param_enabled()) {
 639                         if (hw_is_mask(*v))
 640                                 old_mask = *hw_param_mask(params, *v);
 641                 }
 642                 if (trace_hw_interval_param_enabled()) {
 643                         if (hw_is_interval(*v))
 644                                 old_interval = *hw_param_interval(params, *v);
 645                 }
 646                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
 647                         changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
 648                 else
 649                         changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
 650                 if (changed < 0)
 651                         return changed;
 652                 if (changed == 0)
 653                         continue;
 654
 655                 /* Trace the changed parameter. */
 656                 if (hw_is_mask(*v)) {
 657                         trace_hw_mask_param(pcm, *v, 0, &old_mask,
 658                                             hw_param_mask(params, *v));
 659                 }
 660                 if (hw_is_interval(*v)) {
 661                         trace_hw_interval_param(pcm, *v, 0, &old_interval,
 662                                                 hw_param_interval(params, *v));
 663                 }
 664         }
 665
 666         return 0;
 667 }
 668
 669 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 670                              struct snd_pcm_hw_params *params)
 671 {
 672         struct snd_pcm_runtime *runtime;
 673         int err, usecs;
 674         unsigned int bits;
 675         snd_pcm_uframes_t frames;
 676
 677         if (PCM_RUNTIME_CHECK(substream))
 678                 return -ENXIO;
 679         runtime = substream->runtime;
 680         snd_pcm_stream_lock_irq(substream);
 681         switch (runtime->status->state) {
 682         case SNDRV_PCM_STATE_OPEN:
 683         case SNDRV_PCM_STATE_SETUP:
 684         case SNDRV_PCM_STATE_PREPARED:
 685                 break;
 686         default:
 687                 snd_pcm_stream_unlock_irq(substream);
 688                 return -EBADFD;
 689         }
 690         snd_pcm_stream_unlock_irq(substream);
 691 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 692         if (!substream->oss.oss)
 693 #endif
 694                 if (atomic_read(&substream->mmap_count))
 695                         return -EBADFD;
 696
 697         params->rmask = ~0U;
 698         err = snd_pcm_hw_refine(substream, params);
 699         if (err < 0)
 700                 goto _error;
 701
 702         err = snd_pcm_hw_params_choose(substream, params);
 703         if (err < 0)
 704                 goto _error;
 705
 706         err = fixup_unreferenced_params(substream, params);
 707         if (err < 0)
 708                 goto _error;
 709
 710         if (substream->ops->hw_params != NULL) {
 711                 err = substream->ops->hw_params(substream, params);
 712                 if (err < 0)
 713                         goto _error;
 714         }
 715
 716         runtime->access = params_access(params);
 717         runtime->format = params_format(params);
 718         runtime->subformat = params_subformat(params);
 719         runtime->channels = params_channels(params);
 720         runtime->rate = params_rate(params);
 721         runtime->period_size = params_period_size(params);
 722         runtime->periods = params_periods(params);
 723         runtime->buffer_size = params_buffer_size(params);
 724         runtime->info = params->info;
 725         runtime->rate_num = params->rate_num;
 726         runtime->rate_den = params->rate_den;
 727         runtime->no_period_wakeup =
 728                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 729                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 730
 731         bits = snd_pcm_format_physical_width(runtime->format);
 732         runtime->sample_bits = bits;
 733         bits *= runtime->channels;
 734         runtime->frame_bits = bits;
 735         frames = 1;
 736         while (bits % 8 != 0) {
 737                 bits *= 2;
 738                 frames *= 2;
 739         }
 740         runtime->byte_align = bits / 8;
 741         runtime->min_align = frames;
 742
 743         /* Default sw params */
 744         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 745         runtime->period_step = 1;
 746         runtime->control->avail_min = runtime->period_size;
 747         runtime->start_threshold = 1;
 748         runtime->stop_threshold = runtime->buffer_size;
 749         runtime->silence_threshold = 0;
 750         runtime->silence_size = 0;
 751         runtime->boundary = runtime->buffer_size;
 752         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 753                 runtime->boundary *= 2;
 754
 755         /* clear the buffer for avoiding possible kernel info leaks */
 756         if (runtime->dma_area && !substream->ops->copy_user) {
 757                 size_t size = runtime->dma_bytes;
 758
 759                 if (runtime->info & SNDRV_PCM_INFO_MMAP)
 760                         size = PAGE_ALIGN(size);
 761                 memset(runtime->dma_area, 0, size);
 762         }
 763
 764         snd_pcm_timer_resolution_change(substream);
 765         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 766
 767         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 768                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 769         if ((usecs = period_to_usecs(runtime)) >= 0)
 770                 pm_qos_add_request(&substream->latency_pm_qos_req,
 771                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 772         return 0;
 773  _error:
 774         /* hardware might be unusable from this time,
 775            so we force application to retry to set
 776            the correct hardware parameter settings */
 777         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 778         if (substream->ops->hw_free != NULL)
 779                 substream->ops->hw_free(substream);
 780         return err;
 781 }
 782
 783 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 784                                   struct snd_pcm_hw_params __user * _params)
 785 {
 786         struct snd_pcm_hw_params *params;
 787         int err;
 788
 789         params = memdup_user(_params, sizeof(*params));
 790         if (IS_ERR(params))
 791                 return PTR_ERR(params);
 792
 793         err = snd_pcm_hw_params(substream, params);
 794         if (err < 0)
 795                 goto end;
 796
 797         if (copy_to_user(_params, params, sizeof(*params)))
 798                 err = -EFAULT;
 799 end:
 800         kfree(params);
 801         return err;
 802 }
 803
 804 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 805 {
 806         struct snd_pcm_runtime *runtime;
 807         int result = 0;
 808
 809         if (PCM_RUNTIME_CHECK(substream))
 810                 return -ENXIO;
 811         runtime = substream->runtime;
 812         snd_pcm_stream_lock_irq(substream);
 813         switch (runtime->status->state) {
 814         case SNDRV_PCM_STATE_SETUP:
 815         case SNDRV_PCM_STATE_PREPARED:
 816                 break;
 817         default:
 818                 snd_pcm_stream_unlock_irq(substream);
 819                 return -EBADFD;
 820         }
 821         snd_pcm_stream_unlock_irq(substream);
 822         if (atomic_read(&substream->mmap_count))
 823                 return -EBADFD;
 824         if (substream->ops->hw_free)
 825                 result = substream->ops->hw_free(substream);
 826         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 827         pm_qos_remove_request(&substream->latency_pm_qos_req);
 828         return result;
 829 }
 830
 831 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 832                              struct snd_pcm_sw_params *params)
 833 {
 834         struct snd_pcm_runtime *runtime;
 835         int err;
 836
 837         if (PCM_RUNTIME_CHECK(substream))
 838                 return -ENXIO;
 839         runtime = substream->runtime;
 840         snd_pcm_stream_lock_irq(substream);
 841         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 842                 snd_pcm_stream_unlock_irq(substream);
 843                 return -EBADFD;
 844         }
 845         snd_pcm_stream_unlock_irq(substream);
 846
 847         if (params->tstamp_mode < 0 ||
 848             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 849                 return -EINVAL;
 850         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 851             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 852                 return -EINVAL;
 853         if (params->avail_min == 0)
 854                 return -EINVAL;
 855         if (params->silence_size >= runtime->boundary) {
 856                 if (params->silence_threshold != 0)
 857                         return -EINVAL;
 858         } else {
 859                 if (params->silence_size > params->silence_threshold)
 860                         return -EINVAL;
 861                 if (params->silence_threshold > runtime->buffer_size)
 862                         return -EINVAL;
 863         }
 864         err = 0;
 865         snd_pcm_stream_lock_irq(substream);
 866         runtime->tstamp_mode = params->tstamp_mode;
 867         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 868                 runtime->tstamp_type = params->tstamp_type;
 869         runtime->period_step = params->period_step;
 870         runtime->control->avail_min = params->avail_min;
 871         runtime->start_threshold = params->start_threshold;
 872         runtime->stop_threshold = params->stop_threshold;
 873         runtime->silence_threshold = params->silence_threshold;
 874         runtime->silence_size = params->silence_size;
 875         params->boundary = runtime->boundary;
 876         if (snd_pcm_running(substream)) {
 877                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 878                     runtime->silence_size > 0)
 879                         snd_pcm_playback_silence(substream, ULONG_MAX);
 880                 err = snd_pcm_update_state(substream, runtime);
 881         }
 882         snd_pcm_stream_unlock_irq(substream);
 883         return err;
 884 }
 885
 886 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 887                                   struct snd_pcm_sw_params __user * _params)
 888 {
 889         struct snd_pcm_sw_params params;
 890         int err;
 891         if (copy_from_user(&params, _params, sizeof(params)))
 892                 return -EFAULT;
 893         err = snd_pcm_sw_params(substream, &params);
 894         if (copy_to_user(_params, &params, sizeof(params)))
 895                 return -EFAULT;
 896         return err;
 897 }
 898
 899 static inline snd_pcm_uframes_t
 900 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
 901 {
 902         snd_pcm_uframes_t delay;
 903
 904         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 905                 delay = snd_pcm_playback_hw_avail(substream->runtime);
 906         else
 907                 delay = snd_pcm_capture_avail(substream->runtime);
 908         return delay + substream->runtime->delay;
 909 }
 910
 911 int snd_pcm_status(struct snd_pcm_substream *substream,
 912                    struct snd_pcm_status *status)
 913 {
 914         struct snd_pcm_runtime *runtime = substream->runtime;
 915
 916         snd_pcm_stream_lock_irq(substream);
 917
 918         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
 919                                         &runtime->audio_tstamp_config);
 920
 921         /* backwards compatible behavior */
 922         if (runtime->audio_tstamp_config.type_requested ==
 923                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
 924                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
 925                         runtime->audio_tstamp_config.type_requested =
 926                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
 927                 else
 928                         runtime->audio_tstamp_config.type_requested =
 929                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
 930                 runtime->audio_tstamp_report.valid = 0;
 931         } else
 932                 runtime->audio_tstamp_report.valid = 1;
 933
 934         status->state = runtime->status->state;
 935         status->suspended_state = runtime->status->suspended_state;
 936         if (status->state == SNDRV_PCM_STATE_OPEN)
 937                 goto _end;
 938         status->trigger_tstamp = runtime->trigger_tstamp;
 939         if (snd_pcm_running(substream)) {
 940                 snd_pcm_update_hw_ptr(substream);
 941                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 942                         status->tstamp = runtime->status->tstamp;
 943                         status->driver_tstamp = runtime->driver_tstamp;
 944                         status->audio_tstamp =
 945                                 runtime->status->audio_tstamp;
 946                         if (runtime->audio_tstamp_report.valid == 1)
 947                                 /* backwards compatibility, no report provided in COMPAT mode */
 948                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
 949                                                                 &status->audio_tstamp_accuracy,
 950                                                                 &runtime->audio_tstamp_report);
 951
 952                         goto _tstamp_end;
 953                 }
 954         } else {
 955                 /* get tstamp only in fallback mode and only if enabled */
 956                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 957                         snd_pcm_gettime(runtime, &status->tstamp);
 958         }
 959  _tstamp_end:
 960         status->appl_ptr = runtime->control->appl_ptr;
 961         status->hw_ptr = runtime->status->hw_ptr;
 962         status->avail = snd_pcm_avail(substream);
 963         status->delay = snd_pcm_running(substream) ?
 964                 snd_pcm_calc_delay(substream) : 0;
 965         status->avail_max = runtime->avail_max;
 966         status->overrange = runtime->overrange;
 967         runtime->avail_max = 0;
 968         runtime->overrange = 0;
 969  _end:
 970         snd_pcm_stream_unlock_irq(substream);
 971         return 0;
 972 }
 973
 974 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 975                                struct snd_pcm_status __user * _status,
 976                                bool ext)
 977 {
 978         struct snd_pcm_status status;
 979         int res;
 980
 981         memset(&status, 0, sizeof(status));
 982         /*
 983          * with extension, parameters are read/write,
 984          * get audio_tstamp_data from user,
 985          * ignore rest of status structure
 986          */
 987         if (ext && get_user(status.audio_tstamp_data,
 988                                 (u32 __user *)(&_status->audio_tstamp_data)))
 989                 return -EFAULT;
 990         res = snd_pcm_status(substream, &status);
 991         if (res < 0)
 992                 return res;
 993         if (copy_to_user(_status, &status, sizeof(status)))
 994                 return -EFAULT;
 995         return 0;
 996 }
 997
 998 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 999                                 struct snd_pcm_channel_info * info)
1000 {
1001         struct snd_pcm_runtime *runtime;
1002         unsigned int channel;
1003
1004         channel = info->channel;
1005         runtime = substream->runtime;
1006         snd_pcm_stream_lock_irq(substream);
1007         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
1008                 snd_pcm_stream_unlock_irq(substream);
1009                 return -EBADFD;
1010         }
1011         snd_pcm_stream_unlock_irq(substream);
1012         if (channel >= runtime->channels)
1013                 return -EINVAL;
1014         memset(info, 0, sizeof(*info));
1015         info->channel = channel;
1016         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1017 }
1018
1019 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1020                                      struct snd_pcm_channel_info __user * _info)
1021 {
1022         struct snd_pcm_channel_info info;
1023         int res;
1024
1025         if (copy_from_user(&info, _info, sizeof(info)))
1026                 return -EFAULT;
1027         res = snd_pcm_channel_info(substream, &info);
1028         if (res < 0)
1029                 return res;
1030         if (copy_to_user(_info, &info, sizeof(info)))
1031                 return -EFAULT;
1032         return 0;
1033 }
1034
1035 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1036 {
1037         struct snd_pcm_runtime *runtime = substream->runtime;
1038         if (runtime->trigger_master == NULL)
1039                 return;
1040         if (runtime->trigger_master == substream) {
1041                 if (!runtime->trigger_tstamp_latched)
1042                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1043         } else {
1044                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1045                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1046         }
1047         runtime->trigger_master = NULL;
1048 }
1049
1050 struct action_ops {
1051         int (*pre_action)(struct snd_pcm_substream *substream, int state);
1052         int (*do_action)(struct snd_pcm_substream *substream, int state);
1053         void (*undo_action)(struct snd_pcm_substream *substream, int state);
1054         void (*post_action)(struct snd_pcm_substream *substream, int state);
1055 };
1056
1057 /*
1058  *  this functions is core for handling of linked stream
1059  *  Note: the stream state might be changed also on failure
1060  *  Note2: call with calling stream lock + link lock
1061  */
1062 static int snd_pcm_action_group(const struct action_ops *ops,
1063                                 struct snd_pcm_substream *substream,
1064                                 int state, int do_lock)
1065 {
1066         struct snd_pcm_substream *s = NULL;
1067         struct snd_pcm_substream *s1;
1068         int res = 0, depth = 1;
1069
1070         snd_pcm_group_for_each_entry(s, substream) {
1071                 if (do_lock && s != substream) {
1072                         if (s->pcm->nonatomic)
1073                                 mutex_lock_nested(&s->self_group.mutex, depth);
1074                         else
1075                                 spin_lock_nested(&s->self_group.lock, depth);
1076                         depth++;
1077                 }
1078                 res = ops->pre_action(s, state);
1079                 if (res < 0)
1080                         goto _unlock;
1081         }
1082         snd_pcm_group_for_each_entry(s, substream) {
1083                 res = ops->do_action(s, state);
1084                 if (res < 0) {
1085                         if (ops->undo_action) {
1086                                 snd_pcm_group_for_each_entry(s1, substream) {
1087                                         if (s1 == s) /* failed stream */
1088                                                 break;
1089                                         ops->undo_action(s1, state);
1090                                 }
1091                         }
1092                         s = NULL; /* unlock all */
1093                         goto _unlock;
1094                 }
1095         }
1096         snd_pcm_group_for_each_entry(s, substream) {
1097                 ops->post_action(s, state);
1098         }
1099  _unlock:
1100         if (do_lock) {
1101                 /* unlock streams */
1102                 snd_pcm_group_for_each_entry(s1, substream) {
1103                         if (s1 != substream) {
1104                                 if (s1->pcm->nonatomic)
1105                                         mutex_unlock(&s1->self_group.mutex);
1106                                 else
1107                                         spin_unlock(&s1->self_group.lock);
1108                         }
1109                         if (s1 == s)    /* end */
1110                                 break;
1111                 }
1112         }
1113         return res;
1114 }
1115
1116 /*
1117  *  Note: call with stream lock
1118  */
1119 static int snd_pcm_action_single(const struct action_ops *ops,
1120                                  struct snd_pcm_substream *substream,
1121                                  int state)
1122 {
1123         int res;
1124
1125         res = ops->pre_action(substream, state);
1126         if (res < 0)
1127                 return res;
1128         res = ops->do_action(substream, state);
1129         if (res == 0)
1130                 ops->post_action(substream, state);
1131         else if (ops->undo_action)
1132                 ops->undo_action(substream, state);
1133         return res;
1134 }
1135
1136 /*
1137  *  Note: call with stream lock
1138  */
1139 static int snd_pcm_action(const struct action_ops *ops,
1140                           struct snd_pcm_substream *substream,
1141                           int state)
1142 {
1143         int res;
1144
1145         if (!snd_pcm_stream_linked(substream))
1146                 return snd_pcm_action_single(ops, substream, state);
1147
1148         if (substream->pcm->nonatomic) {
1149                 if (!mutex_trylock(&substream->group->mutex)) {
1150                         mutex_unlock(&substream->self_group.mutex);
1151                         mutex_lock(&substream->group->mutex);
1152                         mutex_lock(&substream->self_group.mutex);
1153                 }
1154                 res = snd_pcm_action_group(ops, substream, state, 1);
1155                 mutex_unlock(&substream->group->mutex);
1156         } else {
1157                 if (!spin_trylock(&substream->group->lock)) {
1158                         spin_unlock(&substream->self_group.lock);
1159                         spin_lock(&substream->group->lock);
1160                         spin_lock(&substream->self_group.lock);
1161                 }
1162                 res = snd_pcm_action_group(ops, substream, state, 1);
1163                 spin_unlock(&substream->group->lock);
1164         }
1165         return res;
1166 }
1167
1168 /*
1169  *  Note: don't use any locks before
1170  */
1171 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1172                                    struct snd_pcm_substream *substream,
1173                                    int state)
1174 {
1175         int res;
1176
1177         snd_pcm_stream_lock_irq(substream);
1178         res = snd_pcm_action(ops, substream, state);
1179         snd_pcm_stream_unlock_irq(substream);
1180         return res;
1181 }
1182
1183 /*
1184  */
1185 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1186                                     struct snd_pcm_substream *substream,
1187                                     int state)
1188 {
1189         int res;
1190
1191         down_read(&snd_pcm_link_rwsem);
1192         if (snd_pcm_stream_linked(substream))
1193                 res = snd_pcm_action_group(ops, substream, state, 0);
1194         else
1195                 res = snd_pcm_action_single(ops, substream, state);
1196         up_read(&snd_pcm_link_rwsem);
1197         return res;
1198 }
1199
1200 /*
1201  * start callbacks
1202  */
1203 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1204 {
1205         struct snd_pcm_runtime *runtime = substream->runtime;
1206         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1207                 return -EBADFD;
1208         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1209             !snd_pcm_playback_data(substream))
1210                 return -EPIPE;
1211         runtime->trigger_tstamp_latched = false;
1212         runtime->trigger_master = substream;
1213         return 0;
1214 }
1215
1216 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1217 {
1218         if (substream->runtime->trigger_master != substream)
1219                 return 0;
1220         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1221 }
1222
1223 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1224 {
1225         if (substream->runtime->trigger_master == substream)
1226                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1227 }
1228
1229 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1230 {
1231         struct snd_pcm_runtime *runtime = substream->runtime;
1232         snd_pcm_trigger_tstamp(substream);
1233         runtime->hw_ptr_jiffies = jiffies;
1234         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1235                                                             runtime->rate;
1236         runtime->status->state = state;
1237         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1238             runtime->silence_size > 0)
1239                 snd_pcm_playback_silence(substream, ULONG_MAX);
1240         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1241 }
1242
1243 static const struct action_ops snd_pcm_action_start = {
1244         .pre_action = snd_pcm_pre_start,
1245         .do_action = snd_pcm_do_start,
1246         .undo_action = snd_pcm_undo_start,
1247         .post_action = snd_pcm_post_start
1248 };
1249
1250 /**
1251  * snd_pcm_start - start all linked streams
1252  * @substream: the PCM substream instance
1253  *
1254  * Return: Zero if successful, or a negative error code.
1255  * The stream lock must be acquired before calling this function.
1256  */
1257 int snd_pcm_start(struct snd_pcm_substream *substream)
1258 {
1259         return snd_pcm_action(&snd_pcm_action_start, substream,
1260                               SNDRV_PCM_STATE_RUNNING);
1261 }
1262
1263 /* take the stream lock and start the streams */
1264 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1265 {
1266         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1267                                        SNDRV_PCM_STATE_RUNNING);
1268 }
1269
1270 /*
1271  * stop callbacks
1272  */
1273 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1274 {
1275         struct snd_pcm_runtime *runtime = substream->runtime;
1276         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1277                 return -EBADFD;
1278         runtime->trigger_master = substream;
1279         return 0;
1280 }
1281
1282 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1283 {
1284         if (substream->runtime->trigger_master == substream &&
1285             snd_pcm_running(substream))
1286                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1287         return 0; /* unconditonally stop all substreams */
1288 }
1289
1290 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1291 {
1292         struct snd_pcm_runtime *runtime = substream->runtime;
1293         if (runtime->status->state != state) {
1294                 snd_pcm_trigger_tstamp(substream);
1295                 runtime->status->state = state;
1296                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1297         }
1298         wake_up(&runtime->sleep);
1299         wake_up(&runtime->tsleep);
1300 }
1301
1302 static const struct action_ops snd_pcm_action_stop = {
1303         .pre_action = snd_pcm_pre_stop,
1304         .do_action = snd_pcm_do_stop,
1305         .post_action = snd_pcm_post_stop
1306 };
1307
1308 /**
1309  * snd_pcm_stop - try to stop all running streams in the substream group
1310  * @substream: the PCM substream instance
1311  * @state: PCM state after stopping the stream
1312  *
1313  * The state of each stream is then changed to the given state unconditionally.
1314  *
1315  * Return: Zero if successful, or a negative error code.
1316  */
1317 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1318 {
1319         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1320 }
1321 EXPORT_SYMBOL(snd_pcm_stop);
1322
1323 /**
1324  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1325  * @substream: the PCM substream
1326  *
1327  * After stopping, the state is changed to SETUP.
1328  * Unlike snd_pcm_stop(), this affects only the given stream.
1329  *
1330  * Return: Zero if succesful, or a negative error code.
1331  */
1332 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1333 {
1334         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1335                                      SNDRV_PCM_STATE_SETUP);
1336 }
1337
1338 /**
1339  * snd_pcm_stop_xrun - stop the running streams as XRUN
1340  * @substream: the PCM substream instance
1341  *
1342  * This stops the given running substream (and all linked substreams) as XRUN.
1343  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1344  *
1345  * Return: Zero if successful, or a negative error code.
1346  */
1347 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1348 {
1349         unsigned long flags;
1350
1351         snd_pcm_stream_lock_irqsave(substream, flags);
1352         if (substream->runtime && snd_pcm_running(substream))
1353                 __snd_pcm_xrun(substream);
1354         snd_pcm_stream_unlock_irqrestore(substream, flags);
1355         return 0;
1356 }
1357 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1358
1359 /*
1360  * pause callbacks
1361  */
1362 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1363 {
1364         struct snd_pcm_runtime *runtime = substream->runtime;
1365         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1366                 return -ENOSYS;
1367         if (push) {
1368                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1369                         return -EBADFD;
1370         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1371                 return -EBADFD;
1372         runtime->trigger_master = substream;
1373         return 0;
1374 }
1375
1376 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1377 {
1378         if (substream->runtime->trigger_master != substream)
1379                 return 0;
1380         /* some drivers might use hw_ptr to recover from the pause -
1381            update the hw_ptr now */
1382         if (push)
1383                 snd_pcm_update_hw_ptr(substream);
1384         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1385          * a delta between the current jiffies, this gives a large enough
1386          * delta, effectively to skip the check once.
1387          */
1388         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1389         return substream->ops->trigger(substream,
1390                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1391                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1392 }
1393
1394 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1395 {
1396         if (substream->runtime->trigger_master == substream)
1397                 substream->ops->trigger(substream,
1398                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1399                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1400 }
1401
1402 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1403 {
1404         struct snd_pcm_runtime *runtime = substream->runtime;
1405         snd_pcm_trigger_tstamp(substream);
1406         if (push) {
1407                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1408                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1409                 wake_up(&runtime->sleep);
1410                 wake_up(&runtime->tsleep);
1411         } else {
1412                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1413                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1414         }
1415 }
1416
1417 static const struct action_ops snd_pcm_action_pause = {
1418         .pre_action = snd_pcm_pre_pause,
1419         .do_action = snd_pcm_do_pause,
1420         .undo_action = snd_pcm_undo_pause,
1421         .post_action = snd_pcm_post_pause
1422 };
1423
1424 /*
1425  * Push/release the pause for all linked streams.
1426  */
1427 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1428 {
1429         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1430 }
1431
1432 #ifdef CONFIG_PM
1433 /* suspend */
1434
1435 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1436 {
1437         struct snd_pcm_runtime *runtime = substream->runtime;
1438         switch (runtime->status->state) {
1439         case SNDRV_PCM_STATE_SUSPENDED:
1440                 return -EBUSY;
1441         /* unresumable PCM state; return -EBUSY for skipping suspend */
1442         case SNDRV_PCM_STATE_OPEN:
1443         case SNDRV_PCM_STATE_SETUP:
1444         case SNDRV_PCM_STATE_DISCONNECTED:
1445                 return -EBUSY;
1446         }
1447         runtime->trigger_master = substream;
1448         return 0;
1449 }
1450
1451 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1452 {
1453         struct snd_pcm_runtime *runtime = substream->runtime;
1454         if (runtime->trigger_master != substream)
1455                 return 0;
1456         if (! snd_pcm_running(substream))
1457                 return 0;
1458         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1459         return 0; /* suspend unconditionally */
1460 }
1461
1462 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1463 {
1464         struct snd_pcm_runtime *runtime = substream->runtime;
1465         snd_pcm_trigger_tstamp(substream);
1466         runtime->status->suspended_state = runtime->status->state;
1467         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1468         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1469         wake_up(&runtime->sleep);
1470         wake_up(&runtime->tsleep);
1471 }
1472
1473 static const struct action_ops snd_pcm_action_suspend = {
1474         .pre_action = snd_pcm_pre_suspend,
1475         .do_action = snd_pcm_do_suspend,
1476         .post_action = snd_pcm_post_suspend
1477 };
1478
1479 /**
1480  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1481  * @substream: the PCM substream
1482  *
1483  * After this call, all streams are changed to SUSPENDED state.
1484  *
1485  * Return: Zero if successful (or @substream is %NULL), or a negative error
1486  * code.
1487  */
1488 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1489 {
1490         int err;
1491         unsigned long flags;
1492
1493         if (! substream)
1494                 return 0;
1495
1496         snd_pcm_stream_lock_irqsave(substream, flags);
1497         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1498         snd_pcm_stream_unlock_irqrestore(substream, flags);
1499         return err;
1500 }
1501 EXPORT_SYMBOL(snd_pcm_suspend);
1502
1503 /**
1504  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1505  * @pcm: the PCM instance
1506  *
1507  * After this call, all streams are changed to SUSPENDED state.
1508  *
1509  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1510  */
1511 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1512 {
1513         struct snd_pcm_substream *substream;
1514         int stream, err = 0;
1515
1516         if (! pcm)
1517                 return 0;
1518
1519         for (stream = 0; stream < 2; stream++) {
1520                 for (substream = pcm->streams[stream].substream;
1521                      substream; substream = substream->next) {
1522                         /* FIXME: the open/close code should lock this as well */
1523                         if (substream->runtime == NULL)
1524                                 continue;
1525
1526                         /*
1527                          * Skip BE dai link PCM's that are internal and may
1528                          * not have their substream ops set.
1529                          */
1530                         if (!substream->ops)
1531                                 continue;
1532
1533                         err = snd_pcm_suspend(substream);
1534                         if (err < 0 && err != -EBUSY)
1535                                 return err;
1536                 }
1537         }
1538         return 0;
1539 }
1540 EXPORT_SYMBOL(snd_pcm_suspend_all);
1541
1542 /* resume */
1543
1544 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1545 {
1546         struct snd_pcm_runtime *runtime = substream->runtime;
1547         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1548                 return -ENOSYS;
1549         runtime->trigger_master = substream;
1550         return 0;
1551 }
1552
1553 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1554 {
1555         struct snd_pcm_runtime *runtime = substream->runtime;
1556         if (runtime->trigger_master != substream)
1557                 return 0;
1558         /* DMA not running previously? */
1559         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1560             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1561              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1562                 return 0;
1563         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1564 }
1565
1566 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1567 {
1568         if (substream->runtime->trigger_master == substream &&
1569             snd_pcm_running(substream))
1570                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1571 }
1572
1573 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1574 {
1575         struct snd_pcm_runtime *runtime = substream->runtime;
1576         snd_pcm_trigger_tstamp(substream);
1577         runtime->status->state = runtime->status->suspended_state;
1578         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1579 }
1580
1581 static const struct action_ops snd_pcm_action_resume = {
1582         .pre_action = snd_pcm_pre_resume,
1583         .do_action = snd_pcm_do_resume,
1584         .undo_action = snd_pcm_undo_resume,
1585         .post_action = snd_pcm_post_resume
1586 };
1587
1588 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1589 {
1590         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1591 }
1592
1593 #else
1594
1595 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1596 {
1597         return -ENOSYS;
1598 }
1599
1600 #endif /* CONFIG_PM */
1601
1602 /*
1603  * xrun ioctl
1604  *
1605  * Change the RUNNING stream(s) to XRUN state.
1606  */
1607 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1608 {
1609         struct snd_pcm_runtime *runtime = substream->runtime;
1610         int result;
1611
1612         snd_pcm_stream_lock_irq(substream);
1613         switch (runtime->status->state) {
1614         case SNDRV_PCM_STATE_XRUN:
1615                 result = 0;     /* already there */
1616                 break;
1617         case SNDRV_PCM_STATE_RUNNING:
1618                 __snd_pcm_xrun(substream);
1619                 result = 0;
1620                 break;
1621         default:
1622                 result = -EBADFD;
1623         }
1624         snd_pcm_stream_unlock_irq(substream);
1625         return result;
1626 }
1627
1628 /*
1629  * reset ioctl
1630  */
1631 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1632 {
1633         struct snd_pcm_runtime *runtime = substream->runtime;
1634         switch (runtime->status->state) {
1635         case SNDRV_PCM_STATE_RUNNING:
1636         case SNDRV_PCM_STATE_PREPARED:
1637         case SNDRV_PCM_STATE_PAUSED:
1638         case SNDRV_PCM_STATE_SUSPENDED:
1639                 return 0;
1640         default:
1641                 return -EBADFD;
1642         }
1643 }
1644
1645 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1646 {
1647         struct snd_pcm_runtime *runtime = substream->runtime;
1648         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1649         if (err < 0)
1650                 return err;
1651         runtime->hw_ptr_base = 0;
1652         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1653                 runtime->status->hw_ptr % runtime->period_size;
1654         runtime->silence_start = runtime->status->hw_ptr;
1655         runtime->silence_filled = 0;
1656         return 0;
1657 }
1658
1659 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1660 {
1661         struct snd_pcm_runtime *runtime = substream->runtime;
1662         runtime->control->appl_ptr = runtime->status->hw_ptr;
1663         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1664             runtime->silence_size > 0)
1665                 snd_pcm_playback_silence(substream, ULONG_MAX);
1666 }
1667
1668 static const struct action_ops snd_pcm_action_reset = {
1669         .pre_action = snd_pcm_pre_reset,
1670         .do_action = snd_pcm_do_reset,
1671         .post_action = snd_pcm_post_reset
1672 };
1673
1674 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1675 {
1676         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1677 }
1678
1679 /*
1680  * prepare ioctl
1681  */
1682 /* we use the second argument for updating f_flags */
1683 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1684                                int f_flags)
1685 {
1686         struct snd_pcm_runtime *runtime = substream->runtime;
1687         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1688             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1689                 return -EBADFD;
1690         if (snd_pcm_running(substream))
1691                 return -EBUSY;
1692         substream->f_flags = f_flags;
1693         return 0;
1694 }
1695
1696 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1697 {
1698         int err;
1699         err = substream->ops->prepare(substream);
1700         if (err < 0)
1701                 return err;
1702         return snd_pcm_do_reset(substream, 0);
1703 }
1704
1705 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1706 {
1707         struct snd_pcm_runtime *runtime = substream->runtime;
1708         runtime->control->appl_ptr = runtime->status->hw_ptr;
1709         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1710 }
1711
1712 static const struct action_ops snd_pcm_action_prepare = {
1713         .pre_action = snd_pcm_pre_prepare,
1714         .do_action = snd_pcm_do_prepare,
1715         .post_action = snd_pcm_post_prepare
1716 };
1717
1718 /**
1719  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1720  * @substream: the PCM substream instance
1721  * @file: file to refer f_flags
1722  *
1723  * Return: Zero if successful, or a negative error code.
1724  */
1725 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1726                            struct file *file)
1727 {
1728         int f_flags;
1729
1730         if (file)
1731                 f_flags = file->f_flags;
1732         else
1733                 f_flags = substream->f_flags;
1734
1735         snd_pcm_stream_lock_irq(substream);
1736         switch (substream->runtime->status->state) {
1737         case SNDRV_PCM_STATE_PAUSED:
1738                 snd_pcm_pause(substream, 0);
1739                 /* fallthru */
1740         case SNDRV_PCM_STATE_SUSPENDED:
1741                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1742                 break;
1743         }
1744         snd_pcm_stream_unlock_irq(substream);
1745
1746         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1747                                         substream, f_flags);
1748 }
1749
1750 /*
1751  * drain ioctl
1752  */
1753
1754 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1755 {
1756         struct snd_pcm_runtime *runtime = substream->runtime;
1757         switch (runtime->status->state) {
1758         case SNDRV_PCM_STATE_OPEN:
1759         case SNDRV_PCM_STATE_DISCONNECTED:
1760         case SNDRV_PCM_STATE_SUSPENDED:
1761                 return -EBADFD;
1762         }
1763         runtime->trigger_master = substream;
1764         return 0;
1765 }
1766
1767 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1768 {
1769         struct snd_pcm_runtime *runtime = substream->runtime;
1770         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1771                 switch (runtime->status->state) {
1772                 case SNDRV_PCM_STATE_PREPARED:
1773                         /* start playback stream if possible */
1774                         if (! snd_pcm_playback_empty(substream)) {
1775                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1776                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1777                         } else {
1778                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1779                         }
1780                         break;
1781                 case SNDRV_PCM_STATE_RUNNING:
1782                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1783                         break;
1784                 case SNDRV_PCM_STATE_XRUN:
1785                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1786                         break;
1787                 default:
1788                         break;
1789                 }
1790         } else {
1791                 /* stop running stream */
1792                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1793                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1794                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1795                         snd_pcm_do_stop(substream, new_state);
1796                         snd_pcm_post_stop(substream, new_state);
1797                 }
1798         }
1799
1800         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1801             runtime->trigger_master == substream &&
1802             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1803                 return substream->ops->trigger(substream,
1804                                                SNDRV_PCM_TRIGGER_DRAIN);
1805
1806         return 0;
1807 }
1808
1809 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1810 {
1811 }
1812
1813 static const struct action_ops snd_pcm_action_drain_init = {
1814         .pre_action = snd_pcm_pre_drain_init,
1815         .do_action = snd_pcm_do_drain_init,
1816         .post_action = snd_pcm_post_drain_init
1817 };
1818
1819 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1820
1821 /*
1822  * Drain the stream(s).
1823  * When the substream is linked, sync until the draining of all playback streams
1824  * is finished.
1825  * After this call, all streams are supposed to be either SETUP or DRAINING
1826  * (capture only) state.
1827  */
1828 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1829                          struct file *file)
1830 {
1831         struct snd_card *card;
1832         struct snd_pcm_runtime *runtime;
1833         struct snd_pcm_substream *s;
1834         wait_queue_entry_t wait;
1835         int result = 0;
1836         int nonblock = 0;
1837
1838         card = substream->pcm->card;
1839         runtime = substream->runtime;
1840
1841         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1842                 return -EBADFD;
1843
1844         if (file) {
1845                 if (file->f_flags & O_NONBLOCK)
1846                         nonblock = 1;
1847         } else if (substream->f_flags & O_NONBLOCK)
1848                 nonblock = 1;
1849
1850         down_read(&snd_pcm_link_rwsem);
1851         snd_pcm_stream_lock_irq(substream);
1852         /* resume pause */
1853         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1854                 snd_pcm_pause(substream, 0);
1855
1856         /* pre-start/stop - all running streams are changed to DRAINING state */
1857         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1858         if (result < 0)
1859                 goto unlock;
1860         /* in non-blocking, we don't wait in ioctl but let caller poll */
1861         if (nonblock) {
1862                 result = -EAGAIN;
1863                 goto unlock;
1864         }
1865
1866         for (;;) {
1867                 long tout;
1868                 struct snd_pcm_runtime *to_check;
1869                 if (signal_pending(current)) {
1870                         result = -ERESTARTSYS;
1871                         break;
1872                 }
1873                 /* find a substream to drain */
1874                 to_check = NULL;
1875                 snd_pcm_group_for_each_entry(s, substream) {
1876                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1877                                 continue;
1878                         runtime = s->runtime;
1879                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1880                                 to_check = runtime;
1881                                 break;
1882                         }
1883                 }
1884                 if (!to_check)
1885                         break; /* all drained */
1886                 init_waitqueue_entry(&wait, current);
1887                 add_wait_queue(&to_check->sleep, &wait);
1888                 snd_pcm_stream_unlock_irq(substream);
1889                 up_read(&snd_pcm_link_rwsem);
1890                 if (runtime->no_period_wakeup)
1891                         tout = MAX_SCHEDULE_TIMEOUT;
1892                 else {
1893                         tout = 10;
1894                         if (runtime->rate) {
1895                                 long t = runtime->period_size * 2 / runtime->rate;
1896                                 tout = max(t, tout);
1897                         }
1898                         tout = msecs_to_jiffies(tout * 1000);
1899                 }
1900                 tout = schedule_timeout_interruptible(tout);
1901                 down_read(&snd_pcm_link_rwsem);
1902                 snd_pcm_stream_lock_irq(substream);
1903                 remove_wait_queue(&to_check->sleep, &wait);
1904                 if (card->shutdown) {
1905                         result = -ENODEV;
1906                         break;
1907                 }
1908                 if (tout == 0) {
1909                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1910                                 result = -ESTRPIPE;
1911                         else {
1912                                 dev_dbg(substream->pcm->card->dev,
1913                                         "playback drain error (DMA or IRQ trouble?)\n");
1914                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1915                                 result = -EIO;
1916                         }
1917                         break;
1918                 }
1919         }
1920
1921  unlock:
1922         snd_pcm_stream_unlock_irq(substream);
1923         up_read(&snd_pcm_link_rwsem);
1924
1925         return result;
1926 }
1927
1928 /*
1929  * drop ioctl
1930  *
1931  * Immediately put all linked substreams into SETUP state.
1932  */
1933 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1934 {
1935         struct snd_pcm_runtime *runtime;
1936         int result = 0;
1937
1938         if (PCM_RUNTIME_CHECK(substream))
1939                 return -ENXIO;
1940         runtime = substream->runtime;
1941
1942         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1943             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1944                 return -EBADFD;
1945
1946         snd_pcm_stream_lock_irq(substream);
1947         /* resume pause */
1948         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1949                 snd_pcm_pause(substream, 0);
1950
1951         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1952         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1953         snd_pcm_stream_unlock_irq(substream);
1954
1955         return result;
1956 }
1957
1958
1959 static bool is_pcm_file(struct file *file)
1960 {
1961         struct inode *inode = file_inode(file);
1962         unsigned int minor;
1963
1964         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1965                 return false;
1966         minor = iminor(inode);
1967         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1968                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1969 }
1970
1971 /*
1972  * PCM link handling
1973  */
1974 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1975 {
1976         int res = 0;
1977         struct snd_pcm_file *pcm_file;
1978         struct snd_pcm_substream *substream1;
1979         struct snd_pcm_group *group;
1980         struct fd f = fdget(fd);
1981
1982         if (!f.file)
1983                 return -EBADFD;
1984         if (!is_pcm_file(f.file)) {
1985                 res = -EBADFD;
1986                 goto _badf;
1987         }
1988         pcm_file = f.file->private_data;
1989         substream1 = pcm_file->substream;
1990         if (substream == substream1) {
1991                 res = -EINVAL;
1992                 goto _badf;
1993         }
1994
1995         group = kmalloc(sizeof(*group), GFP_KERNEL);
1996         if (!group) {
1997                 res = -ENOMEM;
1998                 goto _nolock;
1999         }
2000         down_write_nonfifo(&snd_pcm_link_rwsem);
2001         write_lock_irq(&snd_pcm_link_rwlock);
2002         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2003             substream->runtime->status->state != substream1->runtime->status->state ||
2004             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2005                 res = -EBADFD;
2006                 goto _end;
2007         }
2008         if (snd_pcm_stream_linked(substream1)) {
2009                 res = -EALREADY;
2010                 goto _end;
2011         }
2012         if (!snd_pcm_stream_linked(substream)) {
2013                 substream->group = group;
2014                 group = NULL;
2015                 spin_lock_init(&substream->group->lock);
2016                 mutex_init(&substream->group->mutex);
2017                 INIT_LIST_HEAD(&substream->group->substreams);
2018                 list_add_tail(&substream->link_list, &substream->group->substreams);
2019                 substream->group->count = 1;
2020         }
2021         list_add_tail(&substream1->link_list, &substream->group->substreams);
2022         substream->group->count++;
2023         substream1->group = substream->group;
2024  _end:
2025         write_unlock_irq(&snd_pcm_link_rwlock);
2026         up_write(&snd_pcm_link_rwsem);
2027  _nolock:
2028         snd_card_unref(substream1->pcm->card);
2029         kfree(group);
2030  _badf:
2031         fdput(f);
2032         return res;
2033 }
2034
2035 static void relink_to_local(struct snd_pcm_substream *substream)
2036 {
2037         substream->group = &substream->self_group;
2038         INIT_LIST_HEAD(&substream->self_group.substreams);
2039         list_add_tail(&substream->link_list, &substream->self_group.substreams);
2040 }
2041
2042 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2043 {
2044         struct snd_pcm_substream *s;
2045         int res = 0;
2046
2047         down_write_nonfifo(&snd_pcm_link_rwsem);
2048         write_lock_irq(&snd_pcm_link_rwlock);
2049         if (!snd_pcm_stream_linked(substream)) {
2050                 res = -EALREADY;
2051                 goto _end;
2052         }
2053         list_del(&substream->link_list);
2054         substream->group->count--;
2055         if (substream->group->count == 1) {     /* detach the last stream, too */
2056                 snd_pcm_group_for_each_entry(s, substream) {
2057                         relink_to_local(s);
2058                         break;
2059                 }
2060                 kfree(substream->group);
2061         }
2062         relink_to_local(substream);
2063        _end:
2064         write_unlock_irq(&snd_pcm_link_rwlock);
2065         up_write(&snd_pcm_link_rwsem);
2066         return res;
2067 }
2068
2069 /*
2070  * hw configurator
2071  */
2072 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2073                                struct snd_pcm_hw_rule *rule)
2074 {
2075         struct snd_interval t;
2076         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2077                      hw_param_interval_c(params, rule->deps[1]), &t);
2078         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2079 }
2080
2081 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2082                                struct snd_pcm_hw_rule *rule)
2083 {
2084         struct snd_interval t;
2085         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2086                      hw_param_interval_c(params, rule->deps[1]), &t);
2087         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2088 }
2089
2090 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2091                                    struct snd_pcm_hw_rule *rule)
2092 {
2093         struct snd_interval t;
2094         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2095                          hw_param_interval_c(params, rule->deps[1]),
2096                          (unsigned long) rule->private, &t);
2097         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2098 }
2099
2100 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2101                                    struct snd_pcm_hw_rule *rule)
2102 {
2103         struct snd_interval t;
2104         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2105                          (unsigned long) rule->private,
2106                          hw_param_interval_c(params, rule->deps[1]), &t);
2107         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2108 }
2109
2110 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2111                                   struct snd_pcm_hw_rule *rule)
2112 {
2113         unsigned int k;
2114         const struct snd_interval *i =
2115                                 hw_param_interval_c(params, rule->deps[0]);
2116         struct snd_mask m;
2117         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2118         snd_mask_any(&m);
2119         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2120                 int bits;
2121                 if (! snd_mask_test(mask, k))
2122                         continue;
2123                 bits = snd_pcm_format_physical_width(k);
2124                 if (bits <= 0)
2125                         continue; /* ignore invalid formats */
2126                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2127                         snd_mask_reset(&m, k);
2128         }
2129         return snd_mask_refine(mask, &m);
2130 }
2131
2132 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2133                                        struct snd_pcm_hw_rule *rule)
2134 {
2135         struct snd_interval t;
2136         unsigned int k;
2137         t.min = UINT_MAX;
2138         t.max = 0;
2139         t.openmin = 0;
2140         t.openmax = 0;
2141         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2142                 int bits;
2143                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2144                         continue;
2145                 bits = snd_pcm_format_physical_width(k);
2146                 if (bits <= 0)
2147                         continue; /* ignore invalid formats */
2148                 if (t.min > (unsigned)bits)
2149                         t.min = bits;
2150                 if (t.max < (unsigned)bits)
2151                         t.max = bits;
2152         }
2153         t.integer = 1;
2154         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2155 }
2156
2157 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2158 #error "Change this table"
2159 #endif
2160
2161 static const unsigned int rates[] = {
2162         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2163         48000, 64000, 88200, 96000, 176400, 192000
2164 };
2165
2166 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2167         .count = ARRAY_SIZE(rates),
2168         .list = rates,
2169 };
2170
2171 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2172                                 struct snd_pcm_hw_rule *rule)
2173 {
2174         struct snd_pcm_hardware *hw = rule->private;
2175         return snd_interval_list(hw_param_interval(params, rule->var),
2176                                  snd_pcm_known_rates.count,
2177                                  snd_pcm_known_rates.list, hw->rates);
2178 }
2179
2180 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2181                                             struct snd_pcm_hw_rule *rule)
2182 {
2183         struct snd_interval t;
2184         struct snd_pcm_substream *substream = rule->private;
2185         t.min = 0;
2186         t.max = substream->buffer_bytes_max;
2187         t.openmin = 0;
2188         t.openmax = 0;
2189         t.integer = 1;
2190         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2191 }
2192
2193 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2194 {
2195         struct snd_pcm_runtime *runtime = substream->runtime;
2196         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2197         int k, err;
2198
2199         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2200                 snd_mask_any(constrs_mask(constrs, k));
2201         }
2202
2203         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2204                 snd_interval_any(constrs_interval(constrs, k));
2205         }
2206
2207         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2208         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2209         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2210         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2211         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2212
2213         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2214                                    snd_pcm_hw_rule_format, NULL,
2215                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2216         if (err < 0)
2217                 return err;
2218         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2219                                   snd_pcm_hw_rule_sample_bits, NULL,
2220                                   SNDRV_PCM_HW_PARAM_FORMAT,
2221                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2222         if (err < 0)
2223                 return err;
2224         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2225                                   snd_pcm_hw_rule_div, NULL,
2226                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2227         if (err < 0)
2228                 return err;
2229         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2230                                   snd_pcm_hw_rule_mul, NULL,
2231                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2232         if (err < 0)
2233                 return err;
2234         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2235                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2236                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2237         if (err < 0)
2238                 return err;
2239         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2240                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2241                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2242         if (err < 0)
2243                 return err;
2244         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2245                                   snd_pcm_hw_rule_div, NULL,
2246                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2247         if (err < 0)
2248                 return err;
2249         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2250                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2251                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2252         if (err < 0)
2253                 return err;
2254         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2255                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2256                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2257         if (err < 0)
2258                 return err;
2259         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2260                                   snd_pcm_hw_rule_div, NULL,
2261                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2262         if (err < 0)
2263                 return err;
2264         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2265                                   snd_pcm_hw_rule_div, NULL,
2266                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2267         if (err < 0)
2268                 return err;
2269         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2270                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2271                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2272         if (err < 0)
2273                 return err;
2274         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2275                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2276                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2277         if (err < 0)
2278                 return err;
2279         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2280                                   snd_pcm_hw_rule_mul, NULL,
2281                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2282         if (err < 0)
2283                 return err;
2284         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2285                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2286                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2287         if (err < 0)
2288                 return err;
2289         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2290                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2291                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2292         if (err < 0)
2293                 return err;
2294         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2295                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2296                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2297         if (err < 0)
2298                 return err;
2299         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2300                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2301                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2302         if (err < 0)
2303                 return err;
2304         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2305                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2306                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2307         if (err < 0)
2308                 return err;
2309         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2310                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2311                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2312         if (err < 0)
2313                 return err;
2314         return 0;
2315 }
2316
2317 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2318 {
2319         struct snd_pcm_runtime *runtime = substream->runtime;
2320         struct snd_pcm_hardware *hw = &runtime->hw;
2321         int err;
2322         unsigned int mask = 0;
2323
2324         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2325                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2326         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2327                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2328         if (hw_support_mmap(substream)) {
2329                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2330                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2331                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2332                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2333                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2334                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2335         }
2336         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2337         if (err < 0)
2338                 return err;
2339
2340         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2341         if (err < 0)
2342                 return err;
2343
2344         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2345         if (err < 0)
2346                 return err;
2347
2348         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2349                                            hw->channels_min, hw->channels_max);
2350         if (err < 0)
2351                 return err;
2352
2353         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2354                                            hw->rate_min, hw->rate_max);
2355         if (err < 0)
2356                 return err;
2357
2358         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2359                                            hw->period_bytes_min, hw->period_bytes_max);
2360         if (err < 0)
2361                 return err;
2362
2363         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2364                                            hw->periods_min, hw->periods_max);
2365         if (err < 0)
2366                 return err;
2367
2368         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2369                                            hw->period_bytes_min, hw->buffer_bytes_max);
2370         if (err < 0)
2371                 return err;
2372
2373         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2374                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2375                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2376         if (err < 0)
2377                 return err;
2378
2379         /* FIXME: remove */
2380         if (runtime->dma_bytes) {
2381                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2382                 if (err < 0)
2383                         return err;
2384         }
2385
2386         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2387                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2388                                           snd_pcm_hw_rule_rate, hw,
2389                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2390                 if (err < 0)
2391                         return err;
2392         }
2393
2394         /* FIXME: this belong to lowlevel */
2395         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2396
2397         return 0;
2398 }
2399
2400 static void pcm_release_private(struct snd_pcm_substream *substream)
2401 {
2402         if (snd_pcm_stream_linked(substream))
2403                 snd_pcm_unlink(substream);
2404 }
2405
2406 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2407 {
2408         substream->ref_count--;
2409         if (substream->ref_count > 0)
2410                 return;
2411
2412         snd_pcm_drop(substream);
2413         if (substream->hw_opened) {
2414                 if (substream->ops->hw_free &&
2415                     substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2416                         substream->ops->hw_free(substream);
2417                 substream->ops->close(substream);
2418                 substream->hw_opened = 0;
2419         }
2420         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2421                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2422         if (substream->pcm_release) {
2423                 substream->pcm_release(substream);
2424                 substream->pcm_release = NULL;
2425         }
2426         snd_pcm_detach_substream(substream);
2427 }
2428 EXPORT_SYMBOL(snd_pcm_release_substream);
2429
2430 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2431                            struct file *file,
2432                            struct snd_pcm_substream **rsubstream)
2433 {
2434         struct snd_pcm_substream *substream;
2435         int err;
2436
2437         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2438         if (err < 0)
2439                 return err;
2440         if (substream->ref_count > 1) {
2441                 *rsubstream = substream;
2442                 return 0;
2443         }
2444
2445         err = snd_pcm_hw_constraints_init(substream);
2446         if (err < 0) {
2447                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2448                 goto error;
2449         }
2450
2451         if ((err = substream->ops->open(substream)) < 0)
2452                 goto error;
2453
2454         substream->hw_opened = 1;
2455
2456         err = snd_pcm_hw_constraints_complete(substream);
2457         if (err < 0) {
2458                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2459                 goto error;
2460         }
2461
2462         *rsubstream = substream;
2463         return 0;
2464
2465  error:
2466         snd_pcm_release_substream(substream);
2467         return err;
2468 }
2469 EXPORT_SYMBOL(snd_pcm_open_substream);
2470
2471 static int snd_pcm_open_file(struct file *file,
2472                              struct snd_pcm *pcm,
2473                              int stream)
2474 {
2475         struct snd_pcm_file *pcm_file;
2476         struct snd_pcm_substream *substream;
2477         int err;
2478
2479         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2480         if (err < 0)
2481                 return err;
2482
2483         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2484         if (pcm_file == NULL) {
2485                 snd_pcm_release_substream(substream);
2486                 return -ENOMEM;
2487         }
2488         pcm_file->substream = substream;
2489         if (substream->ref_count == 1) {
2490                 substream->file = pcm_file;
2491                 substream->pcm_release = pcm_release_private;
2492         }
2493         file->private_data = pcm_file;
2494
2495         return 0;
2496 }
2497
2498 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2499 {
2500         struct snd_pcm *pcm;
2501         int err = nonseekable_open(inode, file);
2502         if (err < 0)
2503                 return err;
2504         pcm = snd_lookup_minor_data(iminor(inode),
2505                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2506         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2507         if (pcm)
2508                 snd_card_unref(pcm->card);
2509         return err;
2510 }
2511
2512 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2513 {
2514         struct snd_pcm *pcm;
2515         int err = nonseekable_open(inode, file);
2516         if (err < 0)
2517                 return err;
2518         pcm = snd_lookup_minor_data(iminor(inode),
2519                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2520         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2521         if (pcm)
2522                 snd_card_unref(pcm->card);
2523         return err;
2524 }
2525
2526 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2527 {
2528         int err;
2529         wait_queue_entry_t wait;
2530
2531         if (pcm == NULL) {
2532                 err = -ENODEV;
2533                 goto __error1;
2534         }
2535         err = snd_card_file_add(pcm->card, file);
2536         if (err < 0)
2537                 goto __error1;
2538         if (!try_module_get(pcm->card->module)) {
2539                 err = -EFAULT;
2540                 goto __error2;
2541         }
2542         init_waitqueue_entry(&wait, current);
2543         add_wait_queue(&pcm->open_wait, &wait);
2544         mutex_lock(&pcm->open_mutex);
2545         while (1) {
2546                 err = snd_pcm_open_file(file, pcm, stream);
2547                 if (err >= 0)
2548                         break;
2549                 if (err == -EAGAIN) {
2550                         if (file->f_flags & O_NONBLOCK) {
2551                                 err = -EBUSY;
2552                                 break;
2553                         }
2554                 } else
2555                         break;
2556                 set_current_state(TASK_INTERRUPTIBLE);
2557                 mutex_unlock(&pcm->open_mutex);
2558                 schedule();
2559                 mutex_lock(&pcm->open_mutex);
2560                 if (pcm->card->shutdown) {
2561                         err = -ENODEV;
2562                         break;
2563                 }
2564                 if (signal_pending(current)) {
2565                         err = -ERESTARTSYS;
2566                         break;
2567                 }
2568         }
2569         remove_wait_queue(&pcm->open_wait, &wait);
2570         mutex_unlock(&pcm->open_mutex);
2571         if (err < 0)
2572                 goto __error;
2573         return err;
2574
2575       __error:
2576         module_put(pcm->card->module);
2577       __error2:
2578         snd_card_file_remove(pcm->card, file);
2579       __error1:
2580         return err;
2581 }
2582
2583 static int snd_pcm_release(struct inode *inode, struct file *file)
2584 {
2585         struct snd_pcm *pcm;
2586         struct snd_pcm_substream *substream;
2587         struct snd_pcm_file *pcm_file;
2588
2589         pcm_file = file->private_data;
2590         substream = pcm_file->substream;
2591         if (snd_BUG_ON(!substream))
2592                 return -ENXIO;
2593         pcm = substream->pcm;
2594         mutex_lock(&pcm->open_mutex);
2595         snd_pcm_release_substream(substream);
2596         kfree(pcm_file);
2597         mutex_unlock(&pcm->open_mutex);
2598         wake_up(&pcm->open_wait);
2599         module_put(pcm->card->module);
2600         snd_card_file_remove(pcm->card, file);
2601         return 0;
2602 }
2603
2604 /* check and update PCM state; return 0 or a negative error
2605  * call this inside PCM lock
2606  */
2607 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2608 {
2609         switch (substream->runtime->status->state) {
2610         case SNDRV_PCM_STATE_DRAINING:
2611                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2612                         return -EBADFD;
2613                 /* Fall through */
2614         case SNDRV_PCM_STATE_RUNNING:
2615                 return snd_pcm_update_hw_ptr(substream);
2616         case SNDRV_PCM_STATE_PREPARED:
2617         case SNDRV_PCM_STATE_PAUSED:
2618                 return 0;
2619         case SNDRV_PCM_STATE_SUSPENDED:
2620                 return -ESTRPIPE;
2621         case SNDRV_PCM_STATE_XRUN:
2622                 return -EPIPE;
2623         default:
2624                 return -EBADFD;
2625         }
2626 }
2627
2628 /* increase the appl_ptr; returns the processed frames or a negative error */
2629 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2630                                           snd_pcm_uframes_t frames,
2631                                            snd_pcm_sframes_t avail)
2632 {
2633         struct snd_pcm_runtime *runtime = substream->runtime;
2634         snd_pcm_sframes_t appl_ptr;
2635         int ret;
2636
2637         if (avail <= 0)
2638                 return 0;
2639         if (frames > (snd_pcm_uframes_t)avail)
2640                 frames = avail;
2641         appl_ptr = runtime->control->appl_ptr + frames;
2642         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2643                 appl_ptr -= runtime->boundary;
2644         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2645         return ret < 0 ? ret : frames;
2646 }
2647
2648 /* decrease the appl_ptr; returns the processed frames or zero for error */
2649 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2650                                          snd_pcm_uframes_t frames,
2651                                          snd_pcm_sframes_t avail)
2652 {
2653         struct snd_pcm_runtime *runtime = substream->runtime;
2654         snd_pcm_sframes_t appl_ptr;
2655         int ret;
2656
2657         if (avail <= 0)
2658                 return 0;
2659         if (frames > (snd_pcm_uframes_t)avail)
2660                 frames = avail;
2661         appl_ptr = runtime->control->appl_ptr - frames;
2662         if (appl_ptr < 0)
2663                 appl_ptr += runtime->boundary;
2664         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2665         /* NOTE: we return zero for errors because PulseAudio gets depressed
2666          * upon receiving an error from rewind ioctl and stops processing
2667          * any longer.  Returning zero means that no rewind is done, so
2668          * it's not absolutely wrong to answer like that.
2669          */
2670         return ret < 0 ? 0 : frames;
2671 }
2672
2673 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2674                                         snd_pcm_uframes_t frames)
2675 {
2676         snd_pcm_sframes_t ret;
2677
2678         if (frames == 0)
2679                 return 0;
2680
2681         snd_pcm_stream_lock_irq(substream);
2682         ret = do_pcm_hwsync(substream);
2683         if (!ret)
2684                 ret = rewind_appl_ptr(substream, frames,
2685                                       snd_pcm_hw_avail(substream));
2686         snd_pcm_stream_unlock_irq(substream);
2687         return ret;
2688 }
2689
2690 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2691                                          snd_pcm_uframes_t frames)
2692 {
2693         snd_pcm_sframes_t ret;
2694
2695         if (frames == 0)
2696                 return 0;
2697
2698         snd_pcm_stream_lock_irq(substream);
2699         ret = do_pcm_hwsync(substream);
2700         if (!ret)
2701                 ret = forward_appl_ptr(substream, frames,
2702                                        snd_pcm_avail(substream));
2703         snd_pcm_stream_unlock_irq(substream);
2704         return ret;
2705 }
2706
2707 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2708 {
2709         int err;
2710
2711         snd_pcm_stream_lock_irq(substream);
2712         err = do_pcm_hwsync(substream);
2713         snd_pcm_stream_unlock_irq(substream);
2714         return err;
2715 }
2716
2717 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2718                          snd_pcm_sframes_t *delay)
2719 {
2720         int err;
2721         snd_pcm_sframes_t n = 0;
2722
2723         snd_pcm_stream_lock_irq(substream);
2724         err = do_pcm_hwsync(substream);
2725         if (!err)
2726                 n = snd_pcm_calc_delay(substream);
2727         snd_pcm_stream_unlock_irq(substream);
2728         if (!err)
2729                 *delay = n;
2730         return err;
2731 }
2732
2733 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2734                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2735 {
2736         struct snd_pcm_runtime *runtime = substream->runtime;
2737         struct snd_pcm_sync_ptr sync_ptr;
2738         volatile struct snd_pcm_mmap_status *status;
2739         volatile struct snd_pcm_mmap_control *control;
2740         int err;
2741
2742         memset(&sync_ptr, 0, sizeof(sync_ptr));
2743         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2744                 return -EFAULT;
2745         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2746                 return -EFAULT;
2747         status = runtime->status;
2748         control = runtime->control;
2749         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2750                 err = snd_pcm_hwsync(substream);
2751                 if (err < 0)
2752                         return err;
2753         }
2754         snd_pcm_stream_lock_irq(substream);
2755         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2756                 err = pcm_lib_apply_appl_ptr(substream,
2757                                              sync_ptr.c.control.appl_ptr);
2758                 if (err < 0) {
2759                         snd_pcm_stream_unlock_irq(substream);
2760                         return err;
2761                 }
2762         } else {
2763                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2764         }
2765         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2766                 control->avail_min = sync_ptr.c.control.avail_min;
2767         else
2768                 sync_ptr.c.control.avail_min = control->avail_min;
2769         sync_ptr.s.status.state = status->state;
2770         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2771         sync_ptr.s.status.tstamp = status->tstamp;
2772         sync_ptr.s.status.suspended_state = status->suspended_state;
2773         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2774         snd_pcm_stream_unlock_irq(substream);
2775         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2776                 return -EFAULT;
2777         return 0;
2778 }
2779
2780 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2781 {
2782         struct snd_pcm_runtime *runtime = substream->runtime;
2783         int arg;
2784
2785         if (get_user(arg, _arg))
2786                 return -EFAULT;
2787         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2788                 return -EINVAL;
2789         runtime->tstamp_type = arg;
2790         return 0;
2791 }
2792
2793 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2794                                       struct snd_xferi __user *_xferi)
2795 {
2796         struct snd_xferi xferi;
2797         struct snd_pcm_runtime *runtime = substream->runtime;
2798         snd_pcm_sframes_t result;
2799
2800         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2801                 return -EBADFD;
2802         if (put_user(0, &_xferi->result))
2803                 return -EFAULT;
2804         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2805                 return -EFAULT;
2806         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2807                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2808         else
2809                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2810         __put_user(result, &_xferi->result);
2811         return result < 0 ? result : 0;
2812 }
2813
2814 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2815                                       struct snd_xfern __user *_xfern)
2816 {
2817         struct snd_xfern xfern;
2818         struct snd_pcm_runtime *runtime = substream->runtime;
2819         void *bufs;
2820         snd_pcm_sframes_t result;
2821
2822         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2823                 return -EBADFD;
2824         if (runtime->channels > 128)
2825                 return -EINVAL;
2826         if (put_user(0, &_xfern->result))
2827                 return -EFAULT;
2828         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2829                 return -EFAULT;
2830
2831         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2832         if (IS_ERR(bufs))
2833                 return PTR_ERR(bufs);
2834         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2835                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2836         else
2837                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2838         kfree(bufs);
2839         __put_user(result, &_xfern->result);
2840         return result < 0 ? result : 0;
2841 }
2842
2843 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2844                                 snd_pcm_uframes_t __user *_frames)
2845 {
2846         snd_pcm_uframes_t frames;
2847         snd_pcm_sframes_t result;
2848
2849         if (get_user(frames, _frames))
2850                 return -EFAULT;
2851         if (put_user(0, _frames))
2852                 return -EFAULT;
2853         result = snd_pcm_rewind(substream, frames);
2854         __put_user(result, _frames);
2855         return result < 0 ? result : 0;
2856 }
2857
2858 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2859                                  snd_pcm_uframes_t __user *_frames)
2860 {
2861         snd_pcm_uframes_t frames;
2862         snd_pcm_sframes_t result;
2863
2864         if (get_user(frames, _frames))
2865                 return -EFAULT;
2866         if (put_user(0, _frames))
2867                 return -EFAULT;
2868         result = snd_pcm_forward(substream, frames);
2869         __put_user(result, _frames);
2870         return result < 0 ? result : 0;
2871 }
2872
2873 static int snd_pcm_common_ioctl(struct file *file,
2874                                  struct snd_pcm_substream *substream,
2875                                  unsigned int cmd, void __user *arg)
2876 {
2877         struct snd_pcm_file *pcm_file = file->private_data;
2878         int res;
2879
2880         if (PCM_RUNTIME_CHECK(substream))
2881                 return -ENXIO;
2882
2883         res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2884         if (res < 0)
2885                 return res;
2886
2887         switch (cmd) {
2888         case SNDRV_PCM_IOCTL_PVERSION:
2889                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2890         case SNDRV_PCM_IOCTL_INFO:
2891                 return snd_pcm_info_user(substream, arg);
2892         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2893                 return 0;
2894         case SNDRV_PCM_IOCTL_TTSTAMP:
2895                 return snd_pcm_tstamp(substream, arg);
2896         case SNDRV_PCM_IOCTL_USER_PVERSION:
2897                 if (get_user(pcm_file->user_pversion,
2898                              (unsigned int __user *)arg))
2899                         return -EFAULT;
2900                 return 0;
2901         case SNDRV_PCM_IOCTL_HW_REFINE:
2902                 return snd_pcm_hw_refine_user(substream, arg);
2903         case SNDRV_PCM_IOCTL_HW_PARAMS:
2904                 return snd_pcm_hw_params_user(substream, arg);
2905         case SNDRV_PCM_IOCTL_HW_FREE:
2906                 return snd_pcm_hw_free(substream);
2907         case SNDRV_PCM_IOCTL_SW_PARAMS:
2908                 return snd_pcm_sw_params_user(substream, arg);
2909         case SNDRV_PCM_IOCTL_STATUS:
2910                 return snd_pcm_status_user(substream, arg, false);
2911         case SNDRV_PCM_IOCTL_STATUS_EXT:
2912                 return snd_pcm_status_user(substream, arg, true);
2913         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2914                 return snd_pcm_channel_info_user(substream, arg);
2915         case SNDRV_PCM_IOCTL_PREPARE:
2916                 return snd_pcm_prepare(substream, file);
2917         case SNDRV_PCM_IOCTL_RESET:
2918                 return snd_pcm_reset(substream);
2919         case SNDRV_PCM_IOCTL_START:
2920                 return snd_pcm_start_lock_irq(substream);
2921         case SNDRV_PCM_IOCTL_LINK:
2922                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2923         case SNDRV_PCM_IOCTL_UNLINK:
2924                 return snd_pcm_unlink(substream);
2925         case SNDRV_PCM_IOCTL_RESUME:
2926                 return snd_pcm_resume(substream);
2927         case SNDRV_PCM_IOCTL_XRUN:
2928                 return snd_pcm_xrun(substream);
2929         case SNDRV_PCM_IOCTL_HWSYNC:
2930                 return snd_pcm_hwsync(substream);
2931         case SNDRV_PCM_IOCTL_DELAY:
2932         {
2933                 snd_pcm_sframes_t delay;
2934                 snd_pcm_sframes_t __user *res = arg;
2935                 int err;
2936
2937                 err = snd_pcm_delay(substream, &delay);
2938                 if (err)
2939                         return err;
2940                 if (put_user(delay, res))
2941                         return -EFAULT;
2942                 return 0;
2943         }
2944         case SNDRV_PCM_IOCTL_SYNC_PTR:
2945                 return snd_pcm_sync_ptr(substream, arg);
2946 #ifdef CONFIG_SND_SUPPORT_OLD_API
2947         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2948                 return snd_pcm_hw_refine_old_user(substream, arg);
2949         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2950                 return snd_pcm_hw_params_old_user(substream, arg);
2951 #endif
2952         case SNDRV_PCM_IOCTL_DRAIN:
2953                 return snd_pcm_drain(substream, file);
2954         case SNDRV_PCM_IOCTL_DROP:
2955                 return snd_pcm_drop(substream);
2956         case SNDRV_PCM_IOCTL_PAUSE:
2957                 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2958                                                substream,
2959                                                (int)(unsigned long)arg);
2960         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2961         case SNDRV_PCM_IOCTL_READI_FRAMES:
2962                 return snd_pcm_xferi_frames_ioctl(substream, arg);
2963         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2964         case SNDRV_PCM_IOCTL_READN_FRAMES:
2965                 return snd_pcm_xfern_frames_ioctl(substream, arg);
2966         case SNDRV_PCM_IOCTL_REWIND:
2967                 return snd_pcm_rewind_ioctl(substream, arg);
2968         case SNDRV_PCM_IOCTL_FORWARD:
2969                 return snd_pcm_forward_ioctl(substream, arg);
2970         }
2971         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2972         return -ENOTTY;
2973 }
2974
2975 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2976                           unsigned long arg)
2977 {
2978         struct snd_pcm_file *pcm_file;
2979
2980         pcm_file = file->private_data;
2981
2982         if (((cmd >> 8) & 0xff) != 'A')
2983                 return -ENOTTY;
2984
2985         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2986                                      (void __user *)arg);
2987 }
2988
2989 /**
2990  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2991  * @substream: PCM substream
2992  * @cmd: IOCTL cmd
2993  * @arg: IOCTL argument
2994  *
2995  * The function is provided primarily for OSS layer and USB gadget drivers,
2996  * and it allows only the limited set of ioctls (hw_params, sw_params,
2997  * prepare, start, drain, drop, forward).
2998  */
2999 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3000                          unsigned int cmd, void *arg)
3001 {
3002         snd_pcm_uframes_t *frames = arg;
3003         snd_pcm_sframes_t result;
3004
3005         switch (cmd) {
3006         case SNDRV_PCM_IOCTL_FORWARD:
3007         {
3008                 /* provided only for OSS; capture-only and no value returned */
3009                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3010                         return -EINVAL;
3011                 result = snd_pcm_forward(substream, *frames);
3012                 return result < 0 ? result : 0;
3013         }
3014         case SNDRV_PCM_IOCTL_HW_PARAMS:
3015                 return snd_pcm_hw_params(substream, arg);
3016         case SNDRV_PCM_IOCTL_SW_PARAMS:
3017                 return snd_pcm_sw_params(substream, arg);
3018         case SNDRV_PCM_IOCTL_PREPARE:
3019                 return snd_pcm_prepare(substream, NULL);
3020         case SNDRV_PCM_IOCTL_START:
3021                 return snd_pcm_start_lock_irq(substream);
3022         case SNDRV_PCM_IOCTL_DRAIN:
3023                 return snd_pcm_drain(substream, NULL);
3024         case SNDRV_PCM_IOCTL_DROP:
3025                 return snd_pcm_drop(substream);
3026         case SNDRV_PCM_IOCTL_DELAY:
3027                 return snd_pcm_delay(substream, frames);
3028         default:
3029                 return -EINVAL;
3030         }
3031 }
3032 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3033
3034 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3035                             loff_t * offset)
3036 {
3037         struct snd_pcm_file *pcm_file;
3038         struct snd_pcm_substream *substream;
3039         struct snd_pcm_runtime *runtime;
3040         snd_pcm_sframes_t result;
3041
3042         pcm_file = file->private_data;
3043         substream = pcm_file->substream;
3044         if (PCM_RUNTIME_CHECK(substream))
3045                 return -ENXIO;
3046         runtime = substream->runtime;
3047         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3048                 return -EBADFD;
3049         if (!frame_aligned(runtime, count))
3050                 return -EINVAL;
3051         count = bytes_to_frames(runtime, count);
3052         result = snd_pcm_lib_read(substream, buf, count);
3053         if (result > 0)
3054                 result = frames_to_bytes(runtime, result);
3055         return result;
3056 }
3057
3058 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3059                              size_t count, loff_t * offset)
3060 {
3061         struct snd_pcm_file *pcm_file;
3062         struct snd_pcm_substream *substream;
3063         struct snd_pcm_runtime *runtime;
3064         snd_pcm_sframes_t result;
3065
3066         pcm_file = file->private_data;
3067         substream = pcm_file->substream;
3068         if (PCM_RUNTIME_CHECK(substream))
3069                 return -ENXIO;
3070         runtime = substream->runtime;
3071         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3072                 return -EBADFD;
3073         if (!frame_aligned(runtime, count))
3074                 return -EINVAL;
3075         count = bytes_to_frames(runtime, count);
3076         result = snd_pcm_lib_write(substream, buf, count);
3077         if (result > 0)
3078                 result = frames_to_bytes(runtime, result);
3079         return result;
3080 }
3081
3082 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3083 {
3084         struct snd_pcm_file *pcm_file;
3085         struct snd_pcm_substream *substream;
3086         struct snd_pcm_runtime *runtime;
3087         snd_pcm_sframes_t result;
3088         unsigned long i;
3089         void __user **bufs;
3090         snd_pcm_uframes_t frames;
3091
3092         pcm_file = iocb->ki_filp->private_data;
3093         substream = pcm_file->substream;
3094         if (PCM_RUNTIME_CHECK(substream))
3095                 return -ENXIO;
3096         runtime = substream->runtime;
3097         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3098                 return -EBADFD;
3099         if (!iter_is_iovec(to))
3100                 return -EINVAL;
3101         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3102                 return -EINVAL;
3103         if (!frame_aligned(runtime, to->iov->iov_len))
3104                 return -EINVAL;
3105         frames = bytes_to_samples(runtime, to->iov->iov_len);
3106         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3107         if (bufs == NULL)
3108                 return -ENOMEM;
3109         for (i = 0; i < to->nr_segs; ++i)
3110                 bufs[i] = to->iov[i].iov_base;
3111         result = snd_pcm_lib_readv(substream, bufs, frames);
3112         if (result > 0)
3113                 result = frames_to_bytes(runtime, result);
3114         kfree(bufs);
3115         return result;
3116 }
3117
3118 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3119 {
3120         struct snd_pcm_file *pcm_file;
3121         struct snd_pcm_substream *substream;
3122         struct snd_pcm_runtime *runtime;
3123         snd_pcm_sframes_t result;
3124         unsigned long i;
3125         void __user **bufs;
3126         snd_pcm_uframes_t frames;
3127
3128         pcm_file = iocb->ki_filp->private_data;
3129         substream = pcm_file->substream;
3130         if (PCM_RUNTIME_CHECK(substream))
3131                 return -ENXIO;
3132         runtime = substream->runtime;
3133         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3134                 return -EBADFD;
3135         if (!iter_is_iovec(from))
3136                 return -EINVAL;
3137         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3138             !frame_aligned(runtime, from->iov->iov_len))
3139                 return -EINVAL;
3140         frames = bytes_to_samples(runtime, from->iov->iov_len);
3141         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3142         if (bufs == NULL)
3143                 return -ENOMEM;
3144         for (i = 0; i < from->nr_segs; ++i)
3145                 bufs[i] = from->iov[i].iov_base;
3146         result = snd_pcm_lib_writev(substream, bufs, frames);
3147         if (result > 0)
3148                 result = frames_to_bytes(runtime, result);
3149         kfree(bufs);
3150         return result;
3151 }
3152
3153 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3154 {
3155         struct snd_pcm_file *pcm_file;
3156         struct snd_pcm_substream *substream;
3157         struct snd_pcm_runtime *runtime;
3158         __poll_t mask, ok;
3159         snd_pcm_uframes_t avail;
3160
3161         pcm_file = file->private_data;
3162
3163         substream = pcm_file->substream;
3164         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3165                 ok = EPOLLOUT | EPOLLWRNORM;
3166         else
3167                 ok = EPOLLIN | EPOLLRDNORM;
3168         if (PCM_RUNTIME_CHECK(substream))
3169                 return ok | EPOLLERR;
3170
3171         runtime = substream->runtime;
3172         poll_wait(file, &runtime->sleep, wait);
3173
3174         mask = 0;
3175         snd_pcm_stream_lock_irq(substream);
3176         avail = snd_pcm_avail(substream);
3177         switch (runtime->status->state) {
3178         case SNDRV_PCM_STATE_RUNNING:
3179         case SNDRV_PCM_STATE_PREPARED:
3180         case SNDRV_PCM_STATE_PAUSED:
3181                 if (avail >= runtime->control->avail_min)
3182                         mask = ok;
3183                 break;
3184         case SNDRV_PCM_STATE_DRAINING:
3185                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3186                         mask = ok;
3187                         if (!avail)
3188                                 mask |= EPOLLERR;
3189                 }
3190                 break;
3191         default:
3192                 mask = ok | EPOLLERR;
3193                 break;
3194         }
3195         snd_pcm_stream_unlock_irq(substream);
3196         return mask;
3197 }
3198
3199 /*
3200  * mmap support
3201  */
3202
3203 /*
3204  * Only on coherent architectures, we can mmap the status and the control records
3205  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3206  */
3207 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3208 /*
3209  * mmap status record
3210  */
3211 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3212 {
3213         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3214         struct snd_pcm_runtime *runtime;
3215
3216         if (substream == NULL)
3217                 return VM_FAULT_SIGBUS;
3218         runtime = substream->runtime;
3219         vmf->page = virt_to_page(runtime->status);
3220         get_page(vmf->page);
3221         return 0;
3222 }
3223
3224 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3225 {
3226         .fault =        snd_pcm_mmap_status_fault,
3227 };
3228
3229 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3230                                struct vm_area_struct *area)
3231 {
3232         long size;
3233         if (!(area->vm_flags & VM_READ))
3234                 return -EINVAL;
3235         size = area->vm_end - area->vm_start;
3236         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3237                 return -EINVAL;
3238         area->vm_ops = &snd_pcm_vm_ops_status;
3239         area->vm_private_data = substream;
3240         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3241         return 0;
3242 }
3243
3244 /*
3245  * mmap control record
3246  */
3247 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3248 {
3249         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3250         struct snd_pcm_runtime *runtime;
3251
3252         if (substream == NULL)
3253                 return VM_FAULT_SIGBUS;
3254         runtime = substream->runtime;
3255         vmf->page = virt_to_page(runtime->control);
3256         get_page(vmf->page);
3257         return 0;
3258 }
3259
3260 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3261 {
3262         .fault =        snd_pcm_mmap_control_fault,
3263 };
3264
3265 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3266                                 struct vm_area_struct *area)
3267 {
3268         long size;
3269         if (!(area->vm_flags & VM_READ))
3270                 return -EINVAL;
3271         size = area->vm_end - area->vm_start;
3272         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3273                 return -EINVAL;
3274         area->vm_ops = &snd_pcm_vm_ops_control;
3275         area->vm_private_data = substream;
3276         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3277         return 0;
3278 }
3279
3280 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3281 {
3282         if (pcm_file->no_compat_mmap)
3283                 return false;
3284         /* See pcm_control_mmap_allowed() below.
3285          * Since older alsa-lib requires both status and control mmaps to be
3286          * coupled, we have to disable the status mmap for old alsa-lib, too.
3287          */
3288         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3289             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3290                 return false;
3291         return true;
3292 }
3293
3294 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3295 {
3296         if (pcm_file->no_compat_mmap)
3297                 return false;
3298         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3299          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3300          * thus it effectively assures the manual update of appl_ptr.
3301          */
3302         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3303                 return false;
3304         return true;
3305 }
3306
3307 #else /* ! coherent mmap */
3308 /*
3309  * don't support mmap for status and control records.
3310  */
3311 #define pcm_status_mmap_allowed(pcm_file)       false
3312 #define pcm_control_mmap_allowed(pcm_file)      false
3313
3314 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3315                                struct vm_area_struct *area)
3316 {
3317         return -ENXIO;
3318 }
3319 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3320                                 struct vm_area_struct *area)
3321 {
3322         return -ENXIO;
3323 }
3324 #endif /* coherent mmap */
3325
3326 static inline struct page *
3327 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3328 {
3329         void *vaddr = substream->runtime->dma_area + ofs;
3330         return virt_to_page(vaddr);
3331 }
3332
3333 /*
3334  * fault callback for mmapping a RAM page
3335  */
3336 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3337 {
3338         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3339         struct snd_pcm_runtime *runtime;
3340         unsigned long offset;
3341         struct page * page;
3342         size_t dma_bytes;
3343
3344         if (substream == NULL)
3345                 return VM_FAULT_SIGBUS;
3346         runtime = substream->runtime;
3347         offset = vmf->pgoff << PAGE_SHIFT;
3348         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3349         if (offset > dma_bytes - PAGE_SIZE)
3350                 return VM_FAULT_SIGBUS;
3351         if (substream->ops->page)
3352                 page = substream->ops->page(substream, offset);
3353         else
3354                 page = snd_pcm_default_page_ops(substream, offset);
3355         if (!page)
3356                 return VM_FAULT_SIGBUS;
3357         get_page(page);
3358         vmf->page = page;
3359         return 0;
3360 }
3361
3362 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3363         .open =         snd_pcm_mmap_data_open,
3364         .close =        snd_pcm_mmap_data_close,
3365 };
3366
3367 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3368         .open =         snd_pcm_mmap_data_open,
3369         .close =        snd_pcm_mmap_data_close,
3370         .fault =        snd_pcm_mmap_data_fault,
3371 };
3372
3373 /*
3374  * mmap the DMA buffer on RAM
3375  */
3376
3377 /**
3378  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3379  * @substream: PCM substream
3380  * @area: VMA
3381  *
3382  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3383  * this function is invoked implicitly.
3384  */
3385 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3386                              struct vm_area_struct *area)
3387 {
3388         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3389 #ifdef CONFIG_GENERIC_ALLOCATOR
3390         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3391                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3392                 return remap_pfn_range(area, area->vm_start,
3393                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3394                                 area->vm_end - area->vm_start, area->vm_page_prot);
3395         }
3396 #endif /* CONFIG_GENERIC_ALLOCATOR */
3397 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3398         if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3399             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3400                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3401                                          area,
3402                                          substream->runtime->dma_area,
3403                                          substream->runtime->dma_addr,
3404                                          substream->runtime->dma_bytes);
3405 #endif /* CONFIG_X86 */
3406         /* mmap with fault handler */
3407         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3408         return 0;
3409 }
3410 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3411
3412 /*
3413  * mmap the DMA buffer on I/O memory area
3414  */
3415 #if SNDRV_PCM_INFO_MMAP_IOMEM
3416 /**
3417  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3418  * @substream: PCM substream
3419  * @area: VMA
3420  *
3421  * When your hardware uses the iomapped pages as the hardware buffer and
3422  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3423  * is supposed to work only on limited architectures.
3424  */
3425 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3426                            struct vm_area_struct *area)
3427 {
3428         struct snd_pcm_runtime *runtime = substream->runtime;
3429
3430         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3431         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3432 }
3433 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3434 #endif /* SNDRV_PCM_INFO_MMAP */
3435
3436 /*
3437  * mmap DMA buffer
3438  */
3439 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3440                       struct vm_area_struct *area)
3441 {
3442         struct snd_pcm_runtime *runtime;
3443         long size;
3444         unsigned long offset;
3445         size_t dma_bytes;
3446         int err;
3447
3448         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3449                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3450                         return -EINVAL;
3451         } else {
3452                 if (!(area->vm_flags & VM_READ))
3453                         return -EINVAL;
3454         }
3455         runtime = substream->runtime;
3456         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3457                 return -EBADFD;
3458         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3459                 return -ENXIO;
3460         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3461             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3462                 return -EINVAL;
3463         size = area->vm_end - area->vm_start;
3464         offset = area->vm_pgoff << PAGE_SHIFT;
3465         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3466         if ((size_t)size > dma_bytes)
3467                 return -EINVAL;
3468         if (offset > dma_bytes - size)
3469                 return -EINVAL;
3470
3471         area->vm_ops = &snd_pcm_vm_ops_data;
3472         area->vm_private_data = substream;
3473         if (substream->ops->mmap)
3474                 err = substream->ops->mmap(substream, area);
3475         else
3476                 err = snd_pcm_lib_default_mmap(substream, area);
3477         if (!err)
3478                 atomic_inc(&substream->mmap_count);
3479         return err;
3480 }
3481 EXPORT_SYMBOL(snd_pcm_mmap_data);
3482
3483 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3484 {
3485         struct snd_pcm_file * pcm_file;
3486         struct snd_pcm_substream *substream;
3487         unsigned long offset;
3488
3489         pcm_file = file->private_data;
3490         substream = pcm_file->substream;
3491         if (PCM_RUNTIME_CHECK(substream))
3492                 return -ENXIO;
3493
3494         offset = area->vm_pgoff << PAGE_SHIFT;
3495         switch (offset) {
3496         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3497                 if (!pcm_status_mmap_allowed(pcm_file))
3498                         return -ENXIO;
3499                 return snd_pcm_mmap_status(substream, file, area);
3500         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3501                 if (!pcm_control_mmap_allowed(pcm_file))
3502                         return -ENXIO;
3503                 return snd_pcm_mmap_control(substream, file, area);
3504         default:
3505                 return snd_pcm_mmap_data(substream, file, area);
3506         }
3507         return 0;
3508 }
3509
3510 static int snd_pcm_fasync(int fd, struct file * file, int on)
3511 {
3512         struct snd_pcm_file * pcm_file;
3513         struct snd_pcm_substream *substream;
3514         struct snd_pcm_runtime *runtime;
3515
3516         pcm_file = file->private_data;
3517         substream = pcm_file->substream;
3518         if (PCM_RUNTIME_CHECK(substream))
3519                 return -ENXIO;
3520         runtime = substream->runtime;
3521         return fasync_helper(fd, file, on, &runtime->fasync);
3522 }
3523
3524 /*
3525  * ioctl32 compat
3526  */
3527 #ifdef CONFIG_COMPAT
3528 #include "pcm_compat.c"
3529 #else
3530 #define snd_pcm_ioctl_compat    NULL
3531 #endif
3532
3533 /*
3534  *  To be removed helpers to keep binary compatibility
3535  */
3536
3537 #ifdef CONFIG_SND_SUPPORT_OLD_API
3538 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3539 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3540
3541 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3542                                                struct snd_pcm_hw_params_old *oparams)
3543 {
3544         unsigned int i;
3545
3546         memset(params, 0, sizeof(*params));
3547         params->flags = oparams->flags;
3548         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3549                 params->masks[i].bits[0] = oparams->masks[i];
3550         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3551         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3552         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3553         params->info = oparams->info;
3554         params->msbits = oparams->msbits;
3555         params->rate_num = oparams->rate_num;
3556         params->rate_den = oparams->rate_den;
3557         params->fifo_size = oparams->fifo_size;
3558 }
3559
3560 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3561                                              struct snd_pcm_hw_params *params)
3562 {
3563         unsigned int i;
3564
3565         memset(oparams, 0, sizeof(*oparams));
3566         oparams->flags = params->flags;
3567         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3568                 oparams->masks[i] = params->masks[i].bits[0];
3569         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3570         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3571         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3572         oparams->info = params->info;
3573         oparams->msbits = params->msbits;
3574         oparams->rate_num = params->rate_num;
3575         oparams->rate_den = params->rate_den;
3576         oparams->fifo_size = params->fifo_size;
3577 }
3578
3579 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3580                                       struct snd_pcm_hw_params_old __user * _oparams)
3581 {
3582         struct snd_pcm_hw_params *params;
3583         struct snd_pcm_hw_params_old *oparams = NULL;
3584         int err;
3585
3586         params = kmalloc(sizeof(*params), GFP_KERNEL);
3587         if (!params)
3588                 return -ENOMEM;
3589
3590         oparams = memdup_user(_oparams, sizeof(*oparams));
3591         if (IS_ERR(oparams)) {
3592                 err = PTR_ERR(oparams);
3593                 goto out;
3594         }
3595         snd_pcm_hw_convert_from_old_params(params, oparams);
3596         err = snd_pcm_hw_refine(substream, params);
3597         if (err < 0)
3598                 goto out_old;
3599
3600         err = fixup_unreferenced_params(substream, params);
3601         if (err < 0)
3602                 goto out_old;
3603
3604         snd_pcm_hw_convert_to_old_params(oparams, params);
3605         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3606                 err = -EFAULT;
3607 out_old:
3608         kfree(oparams);
3609 out:
3610         kfree(params);
3611         return err;
3612 }
3613
3614 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3615                                       struct snd_pcm_hw_params_old __user * _oparams)
3616 {
3617         struct snd_pcm_hw_params *params;
3618         struct snd_pcm_hw_params_old *oparams = NULL;
3619         int err;
3620
3621         params = kmalloc(sizeof(*params), GFP_KERNEL);
3622         if (!params)
3623                 return -ENOMEM;
3624
3625         oparams = memdup_user(_oparams, sizeof(*oparams));
3626         if (IS_ERR(oparams)) {
3627                 err = PTR_ERR(oparams);
3628                 goto out;
3629         }
3630
3631         snd_pcm_hw_convert_from_old_params(params, oparams);
3632         err = snd_pcm_hw_params(substream, params);
3633         if (err < 0)
3634                 goto out_old;
3635
3636         snd_pcm_hw_convert_to_old_params(oparams, params);
3637         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3638                 err = -EFAULT;
3639 out_old:
3640         kfree(oparams);
3641 out:
3642         kfree(params);
3643         return err;
3644 }
3645 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3646
3647 #ifndef CONFIG_MMU
3648 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3649                                                unsigned long addr,
3650                                                unsigned long len,
3651                                                unsigned long pgoff,
3652                                                unsigned long flags)
3653 {
3654         struct snd_pcm_file *pcm_file = file->private_data;
3655         struct snd_pcm_substream *substream = pcm_file->substream;
3656         struct snd_pcm_runtime *runtime = substream->runtime;
3657         unsigned long offset = pgoff << PAGE_SHIFT;
3658
3659         switch (offset) {
3660         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3661                 return (unsigned long)runtime->status;
3662         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3663                 return (unsigned long)runtime->control;
3664         default:
3665                 return (unsigned long)runtime->dma_area + offset;
3666         }
3667 }
3668 #else
3669 # define snd_pcm_get_unmapped_area NULL
3670 #endif
3671
3672 /*
3673  *  Register section
3674  */
3675
3676 const struct file_operations snd_pcm_f_ops[2] = {
3677         {
3678                 .owner =                THIS_MODULE,
3679                 .write =                snd_pcm_write,
3680                 .write_iter =           snd_pcm_writev,
3681                 .open =                 snd_pcm_playback_open,
3682                 .release =              snd_pcm_release,
3683                 .llseek =               no_llseek,
3684                 .poll =                 snd_pcm_poll,
3685                 .unlocked_ioctl =       snd_pcm_ioctl,
3686                 .compat_ioctl =         snd_pcm_ioctl_compat,
3687                 .mmap =                 snd_pcm_mmap,
3688                 .fasync =               snd_pcm_fasync,
3689                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3690         },
3691         {
3692                 .owner =                THIS_MODULE,
3693                 .read =                 snd_pcm_read,
3694                 .read_iter =            snd_pcm_readv,
3695                 .open =                 snd_pcm_capture_open,
3696                 .release =              snd_pcm_release,
3697                 .llseek =               no_llseek,
3698                 .poll =                 snd_pcm_poll,
3699                 .unlocked_ioctl =       snd_pcm_ioctl,
3700                 .compat_ioctl =         snd_pcm_ioctl_compat,
3701                 .mmap =                 snd_pcm_mmap,
3702                 .fasync =               snd_pcm_fasync,
3703                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3704         }
3705 };