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         snd_pcm_timer_resolution_change(substream);
 756         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 757
 758         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 759                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 760         if ((usecs = period_to_usecs(runtime)) >= 0)
 761                 pm_qos_add_request(&substream->latency_pm_qos_req,
 762                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 763         return 0;
 764  _error:
 765         /* hardware might be unusable from this time,
 766            so we force application to retry to set
 767            the correct hardware parameter settings */
 768         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 769         if (substream->ops->hw_free != NULL)
 770                 substream->ops->hw_free(substream);
 771         return err;
 772 }
 773
 774 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 775                                   struct snd_pcm_hw_params __user * _params)
 776 {
 777         struct snd_pcm_hw_params *params;
 778         int err;
 779
 780         params = memdup_user(_params, sizeof(*params));
 781         if (IS_ERR(params))
 782                 return PTR_ERR(params);
 783
 784         err = snd_pcm_hw_params(substream, params);
 785         if (err < 0)
 786                 goto end;
 787
 788         if (copy_to_user(_params, params, sizeof(*params)))
 789                 err = -EFAULT;
 790 end:
 791         kfree(params);
 792         return err;
 793 }
 794
 795 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 796 {
 797         struct snd_pcm_runtime *runtime;
 798         int result = 0;
 799
 800         if (PCM_RUNTIME_CHECK(substream))
 801                 return -ENXIO;
 802         runtime = substream->runtime;
 803         snd_pcm_stream_lock_irq(substream);
 804         switch (runtime->status->state) {
 805         case SNDRV_PCM_STATE_SETUP:
 806         case SNDRV_PCM_STATE_PREPARED:
 807                 break;
 808         default:
 809                 snd_pcm_stream_unlock_irq(substream);
 810                 return -EBADFD;
 811         }
 812         snd_pcm_stream_unlock_irq(substream);
 813         if (atomic_read(&substream->mmap_count))
 814                 return -EBADFD;
 815         if (substream->ops->hw_free)
 816                 result = substream->ops->hw_free(substream);
 817         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 818         pm_qos_remove_request(&substream->latency_pm_qos_req);
 819         return result;
 820 }
 821
 822 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 823                              struct snd_pcm_sw_params *params)
 824 {
 825         struct snd_pcm_runtime *runtime;
 826         int err;
 827
 828         if (PCM_RUNTIME_CHECK(substream))
 829                 return -ENXIO;
 830         runtime = substream->runtime;
 831         snd_pcm_stream_lock_irq(substream);
 832         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 833                 snd_pcm_stream_unlock_irq(substream);
 834                 return -EBADFD;
 835         }
 836         snd_pcm_stream_unlock_irq(substream);
 837
 838         if (params->tstamp_mode < 0 ||
 839             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 840                 return -EINVAL;
 841         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 842             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 843                 return -EINVAL;
 844         if (params->avail_min == 0)
 845                 return -EINVAL;
 846         if (params->silence_size >= runtime->boundary) {
 847                 if (params->silence_threshold != 0)
 848                         return -EINVAL;
 849         } else {
 850                 if (params->silence_size > params->silence_threshold)
 851                         return -EINVAL;
 852                 if (params->silence_threshold > runtime->buffer_size)
 853                         return -EINVAL;
 854         }
 855         err = 0;
 856         snd_pcm_stream_lock_irq(substream);
 857         runtime->tstamp_mode = params->tstamp_mode;
 858         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 859                 runtime->tstamp_type = params->tstamp_type;
 860         runtime->period_step = params->period_step;
 861         runtime->control->avail_min = params->avail_min;
 862         runtime->start_threshold = params->start_threshold;
 863         runtime->stop_threshold = params->stop_threshold;
 864         runtime->silence_threshold = params->silence_threshold;
 865         runtime->silence_size = params->silence_size;
 866         params->boundary = runtime->boundary;
 867         if (snd_pcm_running(substream)) {
 868                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 869                     runtime->silence_size > 0)
 870                         snd_pcm_playback_silence(substream, ULONG_MAX);
 871                 err = snd_pcm_update_state(substream, runtime);
 872         }
 873         snd_pcm_stream_unlock_irq(substream);
 874         return err;
 875 }
 876
 877 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 878                                   struct snd_pcm_sw_params __user * _params)
 879 {
 880         struct snd_pcm_sw_params params;
 881         int err;
 882         if (copy_from_user(&params, _params, sizeof(params)))
 883                 return -EFAULT;
 884         err = snd_pcm_sw_params(substream, &params);
 885         if (copy_to_user(_params, &params, sizeof(params)))
 886                 return -EFAULT;
 887         return err;
 888 }
 889
 890 static inline snd_pcm_uframes_t
 891 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
 892 {
 893         snd_pcm_uframes_t delay;
 894
 895         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 896                 delay = snd_pcm_playback_hw_avail(substream->runtime);
 897         else
 898                 delay = snd_pcm_capture_avail(substream->runtime);
 899         return delay + substream->runtime->delay;
 900 }
 901
 902 int snd_pcm_status(struct snd_pcm_substream *substream,
 903                    struct snd_pcm_status *status)
 904 {
 905         struct snd_pcm_runtime *runtime = substream->runtime;
 906
 907         snd_pcm_stream_lock_irq(substream);
 908
 909         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
 910                                         &runtime->audio_tstamp_config);
 911
 912         /* backwards compatible behavior */
 913         if (runtime->audio_tstamp_config.type_requested ==
 914                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
 915                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
 916                         runtime->audio_tstamp_config.type_requested =
 917                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
 918                 else
 919                         runtime->audio_tstamp_config.type_requested =
 920                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
 921                 runtime->audio_tstamp_report.valid = 0;
 922         } else
 923                 runtime->audio_tstamp_report.valid = 1;
 924
 925         status->state = runtime->status->state;
 926         status->suspended_state = runtime->status->suspended_state;
 927         if (status->state == SNDRV_PCM_STATE_OPEN)
 928                 goto _end;
 929         status->trigger_tstamp = runtime->trigger_tstamp;
 930         if (snd_pcm_running(substream)) {
 931                 snd_pcm_update_hw_ptr(substream);
 932                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 933                         status->tstamp = runtime->status->tstamp;
 934                         status->driver_tstamp = runtime->driver_tstamp;
 935                         status->audio_tstamp =
 936                                 runtime->status->audio_tstamp;
 937                         if (runtime->audio_tstamp_report.valid == 1)
 938                                 /* backwards compatibility, no report provided in COMPAT mode */
 939                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
 940                                                                 &status->audio_tstamp_accuracy,
 941                                                                 &runtime->audio_tstamp_report);
 942
 943                         goto _tstamp_end;
 944                 }
 945         } else {
 946                 /* get tstamp only in fallback mode and only if enabled */
 947                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 948                         snd_pcm_gettime(runtime, &status->tstamp);
 949         }
 950  _tstamp_end:
 951         status->appl_ptr = runtime->control->appl_ptr;
 952         status->hw_ptr = runtime->status->hw_ptr;
 953         status->avail = snd_pcm_avail(substream);
 954         status->delay = snd_pcm_running(substream) ?
 955                 snd_pcm_calc_delay(substream) : 0;
 956         status->avail_max = runtime->avail_max;
 957         status->overrange = runtime->overrange;
 958         runtime->avail_max = 0;
 959         runtime->overrange = 0;
 960  _end:
 961         snd_pcm_stream_unlock_irq(substream);
 962         return 0;
 963 }
 964
 965 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 966                                struct snd_pcm_status __user * _status,
 967                                bool ext)
 968 {
 969         struct snd_pcm_status status;
 970         int res;
 971
 972         memset(&status, 0, sizeof(status));
 973         /*
 974          * with extension, parameters are read/write,
 975          * get audio_tstamp_data from user,
 976          * ignore rest of status structure
 977          */
 978         if (ext && get_user(status.audio_tstamp_data,
 979                                 (u32 __user *)(&_status->audio_tstamp_data)))
 980                 return -EFAULT;
 981         res = snd_pcm_status(substream, &status);
 982         if (res < 0)
 983                 return res;
 984         if (copy_to_user(_status, &status, sizeof(status)))
 985                 return -EFAULT;
 986         return 0;
 987 }
 988
 989 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 990                                 struct snd_pcm_channel_info * info)
 991 {
 992         struct snd_pcm_runtime *runtime;
 993         unsigned int channel;
 994
 995         channel = info->channel;
 996         runtime = substream->runtime;
 997         snd_pcm_stream_lock_irq(substream);
 998         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 999                 snd_pcm_stream_unlock_irq(substream);
1000                 return -EBADFD;
1001         }
1002         snd_pcm_stream_unlock_irq(substream);
1003         if (channel >= runtime->channels)
1004                 return -EINVAL;
1005         memset(info, 0, sizeof(*info));
1006         info->channel = channel;
1007         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1008 }
1009
1010 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1011                                      struct snd_pcm_channel_info __user * _info)
1012 {
1013         struct snd_pcm_channel_info info;
1014         int res;
1015
1016         if (copy_from_user(&info, _info, sizeof(info)))
1017                 return -EFAULT;
1018         res = snd_pcm_channel_info(substream, &info);
1019         if (res < 0)
1020                 return res;
1021         if (copy_to_user(_info, &info, sizeof(info)))
1022                 return -EFAULT;
1023         return 0;
1024 }
1025
1026 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1027 {
1028         struct snd_pcm_runtime *runtime = substream->runtime;
1029         if (runtime->trigger_master == NULL)
1030                 return;
1031         if (runtime->trigger_master == substream) {
1032                 if (!runtime->trigger_tstamp_latched)
1033                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1034         } else {
1035                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1036                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1037         }
1038         runtime->trigger_master = NULL;
1039 }
1040
1041 struct action_ops {
1042         int (*pre_action)(struct snd_pcm_substream *substream, int state);
1043         int (*do_action)(struct snd_pcm_substream *substream, int state);
1044         void (*undo_action)(struct snd_pcm_substream *substream, int state);
1045         void (*post_action)(struct snd_pcm_substream *substream, int state);
1046 };
1047
1048 /*
1049  *  this functions is core for handling of linked stream
1050  *  Note: the stream state might be changed also on failure
1051  *  Note2: call with calling stream lock + link lock
1052  */
1053 static int snd_pcm_action_group(const struct action_ops *ops,
1054                                 struct snd_pcm_substream *substream,
1055                                 int state, int do_lock)
1056 {
1057         struct snd_pcm_substream *s = NULL;
1058         struct snd_pcm_substream *s1;
1059         int res = 0, depth = 1;
1060
1061         snd_pcm_group_for_each_entry(s, substream) {
1062                 if (do_lock && s != substream) {
1063                         if (s->pcm->nonatomic)
1064                                 mutex_lock_nested(&s->self_group.mutex, depth);
1065                         else
1066                                 spin_lock_nested(&s->self_group.lock, depth);
1067                         depth++;
1068                 }
1069                 res = ops->pre_action(s, state);
1070                 if (res < 0)
1071                         goto _unlock;
1072         }
1073         snd_pcm_group_for_each_entry(s, substream) {
1074                 res = ops->do_action(s, state);
1075                 if (res < 0) {
1076                         if (ops->undo_action) {
1077                                 snd_pcm_group_for_each_entry(s1, substream) {
1078                                         if (s1 == s) /* failed stream */
1079                                                 break;
1080                                         ops->undo_action(s1, state);
1081                                 }
1082                         }
1083                         s = NULL; /* unlock all */
1084                         goto _unlock;
1085                 }
1086         }
1087         snd_pcm_group_for_each_entry(s, substream) {
1088                 ops->post_action(s, state);
1089         }
1090  _unlock:
1091         if (do_lock) {
1092                 /* unlock streams */
1093                 snd_pcm_group_for_each_entry(s1, substream) {
1094                         if (s1 != substream) {
1095                                 if (s1->pcm->nonatomic)
1096                                         mutex_unlock(&s1->self_group.mutex);
1097                                 else
1098                                         spin_unlock(&s1->self_group.lock);
1099                         }
1100                         if (s1 == s)    /* end */
1101                                 break;
1102                 }
1103         }
1104         return res;
1105 }
1106
1107 /*
1108  *  Note: call with stream lock
1109  */
1110 static int snd_pcm_action_single(const struct action_ops *ops,
1111                                  struct snd_pcm_substream *substream,
1112                                  int state)
1113 {
1114         int res;
1115
1116         res = ops->pre_action(substream, state);
1117         if (res < 0)
1118                 return res;
1119         res = ops->do_action(substream, state);
1120         if (res == 0)
1121                 ops->post_action(substream, state);
1122         else if (ops->undo_action)
1123                 ops->undo_action(substream, state);
1124         return res;
1125 }
1126
1127 /*
1128  *  Note: call with stream lock
1129  */
1130 static int snd_pcm_action(const struct action_ops *ops,
1131                           struct snd_pcm_substream *substream,
1132                           int state)
1133 {
1134         int res;
1135
1136         if (!snd_pcm_stream_linked(substream))
1137                 return snd_pcm_action_single(ops, substream, state);
1138
1139         if (substream->pcm->nonatomic) {
1140                 if (!mutex_trylock(&substream->group->mutex)) {
1141                         mutex_unlock(&substream->self_group.mutex);
1142                         mutex_lock(&substream->group->mutex);
1143                         mutex_lock(&substream->self_group.mutex);
1144                 }
1145                 res = snd_pcm_action_group(ops, substream, state, 1);
1146                 mutex_unlock(&substream->group->mutex);
1147         } else {
1148                 if (!spin_trylock(&substream->group->lock)) {
1149                         spin_unlock(&substream->self_group.lock);
1150                         spin_lock(&substream->group->lock);
1151                         spin_lock(&substream->self_group.lock);
1152                 }
1153                 res = snd_pcm_action_group(ops, substream, state, 1);
1154                 spin_unlock(&substream->group->lock);
1155         }
1156         return res;
1157 }
1158
1159 /*
1160  *  Note: don't use any locks before
1161  */
1162 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1163                                    struct snd_pcm_substream *substream,
1164                                    int state)
1165 {
1166         int res;
1167
1168         snd_pcm_stream_lock_irq(substream);
1169         res = snd_pcm_action(ops, substream, state);
1170         snd_pcm_stream_unlock_irq(substream);
1171         return res;
1172 }
1173
1174 /*
1175  */
1176 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1177                                     struct snd_pcm_substream *substream,
1178                                     int state)
1179 {
1180         int res;
1181
1182         down_read(&snd_pcm_link_rwsem);
1183         if (snd_pcm_stream_linked(substream))
1184                 res = snd_pcm_action_group(ops, substream, state, 0);
1185         else
1186                 res = snd_pcm_action_single(ops, substream, state);
1187         up_read(&snd_pcm_link_rwsem);
1188         return res;
1189 }
1190
1191 /*
1192  * start callbacks
1193  */
1194 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1195 {
1196         struct snd_pcm_runtime *runtime = substream->runtime;
1197         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1198                 return -EBADFD;
1199         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1200             !snd_pcm_playback_data(substream))
1201                 return -EPIPE;
1202         runtime->trigger_tstamp_latched = false;
1203         runtime->trigger_master = substream;
1204         return 0;
1205 }
1206
1207 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1208 {
1209         if (substream->runtime->trigger_master != substream)
1210                 return 0;
1211         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1212 }
1213
1214 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1215 {
1216         if (substream->runtime->trigger_master == substream)
1217                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1218 }
1219
1220 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1221 {
1222         struct snd_pcm_runtime *runtime = substream->runtime;
1223         snd_pcm_trigger_tstamp(substream);
1224         runtime->hw_ptr_jiffies = jiffies;
1225         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1226                                                             runtime->rate;
1227         runtime->status->state = state;
1228         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1229             runtime->silence_size > 0)
1230                 snd_pcm_playback_silence(substream, ULONG_MAX);
1231         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1232 }
1233
1234 static const struct action_ops snd_pcm_action_start = {
1235         .pre_action = snd_pcm_pre_start,
1236         .do_action = snd_pcm_do_start,
1237         .undo_action = snd_pcm_undo_start,
1238         .post_action = snd_pcm_post_start
1239 };
1240
1241 /**
1242  * snd_pcm_start - start all linked streams
1243  * @substream: the PCM substream instance
1244  *
1245  * Return: Zero if successful, or a negative error code.
1246  * The stream lock must be acquired before calling this function.
1247  */
1248 int snd_pcm_start(struct snd_pcm_substream *substream)
1249 {
1250         return snd_pcm_action(&snd_pcm_action_start, substream,
1251                               SNDRV_PCM_STATE_RUNNING);
1252 }
1253
1254 /* take the stream lock and start the streams */
1255 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1256 {
1257         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1258                                        SNDRV_PCM_STATE_RUNNING);
1259 }
1260
1261 /*
1262  * stop callbacks
1263  */
1264 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1265 {
1266         struct snd_pcm_runtime *runtime = substream->runtime;
1267         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1268                 return -EBADFD;
1269         runtime->trigger_master = substream;
1270         return 0;
1271 }
1272
1273 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1274 {
1275         if (substream->runtime->trigger_master == substream &&
1276             snd_pcm_running(substream))
1277                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1278         return 0; /* unconditonally stop all substreams */
1279 }
1280
1281 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1282 {
1283         struct snd_pcm_runtime *runtime = substream->runtime;
1284         if (runtime->status->state != state) {
1285                 snd_pcm_trigger_tstamp(substream);
1286                 runtime->status->state = state;
1287                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1288         }
1289         wake_up(&runtime->sleep);
1290         wake_up(&runtime->tsleep);
1291 }
1292
1293 static const struct action_ops snd_pcm_action_stop = {
1294         .pre_action = snd_pcm_pre_stop,
1295         .do_action = snd_pcm_do_stop,
1296         .post_action = snd_pcm_post_stop
1297 };
1298
1299 /**
1300  * snd_pcm_stop - try to stop all running streams in the substream group
1301  * @substream: the PCM substream instance
1302  * @state: PCM state after stopping the stream
1303  *
1304  * The state of each stream is then changed to the given state unconditionally.
1305  *
1306  * Return: Zero if successful, or a negative error code.
1307  */
1308 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1309 {
1310         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1311 }
1312 EXPORT_SYMBOL(snd_pcm_stop);
1313
1314 /**
1315  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1316  * @substream: the PCM substream
1317  *
1318  * After stopping, the state is changed to SETUP.
1319  * Unlike snd_pcm_stop(), this affects only the given stream.
1320  *
1321  * Return: Zero if succesful, or a negative error code.
1322  */
1323 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1324 {
1325         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1326                                      SNDRV_PCM_STATE_SETUP);
1327 }
1328
1329 /**
1330  * snd_pcm_stop_xrun - stop the running streams as XRUN
1331  * @substream: the PCM substream instance
1332  *
1333  * This stops the given running substream (and all linked substreams) as XRUN.
1334  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1335  *
1336  * Return: Zero if successful, or a negative error code.
1337  */
1338 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1339 {
1340         unsigned long flags;
1341
1342         snd_pcm_stream_lock_irqsave(substream, flags);
1343         if (substream->runtime && snd_pcm_running(substream))
1344                 __snd_pcm_xrun(substream);
1345         snd_pcm_stream_unlock_irqrestore(substream, flags);
1346         return 0;
1347 }
1348 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1349
1350 /*
1351  * pause callbacks
1352  */
1353 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1354 {
1355         struct snd_pcm_runtime *runtime = substream->runtime;
1356         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1357                 return -ENOSYS;
1358         if (push) {
1359                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1360                         return -EBADFD;
1361         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1362                 return -EBADFD;
1363         runtime->trigger_master = substream;
1364         return 0;
1365 }
1366
1367 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1368 {
1369         if (substream->runtime->trigger_master != substream)
1370                 return 0;
1371         /* some drivers might use hw_ptr to recover from the pause -
1372            update the hw_ptr now */
1373         if (push)
1374                 snd_pcm_update_hw_ptr(substream);
1375         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1376          * a delta between the current jiffies, this gives a large enough
1377          * delta, effectively to skip the check once.
1378          */
1379         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1380         return substream->ops->trigger(substream,
1381                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1382                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1383 }
1384
1385 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1386 {
1387         if (substream->runtime->trigger_master == substream)
1388                 substream->ops->trigger(substream,
1389                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1390                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1391 }
1392
1393 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1394 {
1395         struct snd_pcm_runtime *runtime = substream->runtime;
1396         snd_pcm_trigger_tstamp(substream);
1397         if (push) {
1398                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1399                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1400                 wake_up(&runtime->sleep);
1401                 wake_up(&runtime->tsleep);
1402         } else {
1403                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1404                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1405         }
1406 }
1407
1408 static const struct action_ops snd_pcm_action_pause = {
1409         .pre_action = snd_pcm_pre_pause,
1410         .do_action = snd_pcm_do_pause,
1411         .undo_action = snd_pcm_undo_pause,
1412         .post_action = snd_pcm_post_pause
1413 };
1414
1415 /*
1416  * Push/release the pause for all linked streams.
1417  */
1418 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1419 {
1420         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1421 }
1422
1423 #ifdef CONFIG_PM
1424 /* suspend */
1425
1426 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1427 {
1428         struct snd_pcm_runtime *runtime = substream->runtime;
1429         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1430                 return -EBUSY;
1431         runtime->trigger_master = substream;
1432         return 0;
1433 }
1434
1435 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1436 {
1437         struct snd_pcm_runtime *runtime = substream->runtime;
1438         if (runtime->trigger_master != substream)
1439                 return 0;
1440         if (! snd_pcm_running(substream))
1441                 return 0;
1442         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1443         return 0; /* suspend unconditionally */
1444 }
1445
1446 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1447 {
1448         struct snd_pcm_runtime *runtime = substream->runtime;
1449         snd_pcm_trigger_tstamp(substream);
1450         runtime->status->suspended_state = runtime->status->state;
1451         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1452         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1453         wake_up(&runtime->sleep);
1454         wake_up(&runtime->tsleep);
1455 }
1456
1457 static const struct action_ops snd_pcm_action_suspend = {
1458         .pre_action = snd_pcm_pre_suspend,
1459         .do_action = snd_pcm_do_suspend,
1460         .post_action = snd_pcm_post_suspend
1461 };
1462
1463 /*
1464  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1465  * @substream: the PCM substream
1466  *
1467  * After this call, all streams are changed to SUSPENDED state.
1468  *
1469  * Return: Zero if successful, or a negative error code.
1470  */
1471 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1472 {
1473         int err;
1474         unsigned long flags;
1475
1476         snd_pcm_stream_lock_irqsave(substream, flags);
1477         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1478         snd_pcm_stream_unlock_irqrestore(substream, flags);
1479         return err;
1480 }
1481
1482 /**
1483  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1484  * @pcm: the PCM instance
1485  *
1486  * After this call, all streams are changed to SUSPENDED state.
1487  *
1488  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1489  */
1490 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1491 {
1492         struct snd_pcm_substream *substream;
1493         int stream, err = 0;
1494
1495         if (! pcm)
1496                 return 0;
1497
1498         for (stream = 0; stream < 2; stream++) {
1499                 for (substream = pcm->streams[stream].substream;
1500                      substream; substream = substream->next) {
1501                         /* FIXME: the open/close code should lock this as well */
1502                         if (substream->runtime == NULL)
1503                                 continue;
1504                         err = snd_pcm_suspend(substream);
1505                         if (err < 0 && err != -EBUSY)
1506                                 return err;
1507                 }
1508         }
1509         return 0;
1510 }
1511 EXPORT_SYMBOL(snd_pcm_suspend_all);
1512
1513 /* resume */
1514
1515 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1516 {
1517         struct snd_pcm_runtime *runtime = substream->runtime;
1518         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1519                 return -ENOSYS;
1520         runtime->trigger_master = substream;
1521         return 0;
1522 }
1523
1524 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1525 {
1526         struct snd_pcm_runtime *runtime = substream->runtime;
1527         if (runtime->trigger_master != substream)
1528                 return 0;
1529         /* DMA not running previously? */
1530         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1531             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1532              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1533                 return 0;
1534         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1535 }
1536
1537 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1538 {
1539         if (substream->runtime->trigger_master == substream &&
1540             snd_pcm_running(substream))
1541                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1542 }
1543
1544 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1545 {
1546         struct snd_pcm_runtime *runtime = substream->runtime;
1547         snd_pcm_trigger_tstamp(substream);
1548         runtime->status->state = runtime->status->suspended_state;
1549         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1550 }
1551
1552 static const struct action_ops snd_pcm_action_resume = {
1553         .pre_action = snd_pcm_pre_resume,
1554         .do_action = snd_pcm_do_resume,
1555         .undo_action = snd_pcm_undo_resume,
1556         .post_action = snd_pcm_post_resume
1557 };
1558
1559 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1560 {
1561         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1562 }
1563
1564 #else
1565
1566 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1567 {
1568         return -ENOSYS;
1569 }
1570
1571 #endif /* CONFIG_PM */
1572
1573 /*
1574  * xrun ioctl
1575  *
1576  * Change the RUNNING stream(s) to XRUN state.
1577  */
1578 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1579 {
1580         struct snd_pcm_runtime *runtime = substream->runtime;
1581         int result;
1582
1583         snd_pcm_stream_lock_irq(substream);
1584         switch (runtime->status->state) {
1585         case SNDRV_PCM_STATE_XRUN:
1586                 result = 0;     /* already there */
1587                 break;
1588         case SNDRV_PCM_STATE_RUNNING:
1589                 __snd_pcm_xrun(substream);
1590                 result = 0;
1591                 break;
1592         default:
1593                 result = -EBADFD;
1594         }
1595         snd_pcm_stream_unlock_irq(substream);
1596         return result;
1597 }
1598
1599 /*
1600  * reset ioctl
1601  */
1602 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1603 {
1604         struct snd_pcm_runtime *runtime = substream->runtime;
1605         switch (runtime->status->state) {
1606         case SNDRV_PCM_STATE_RUNNING:
1607         case SNDRV_PCM_STATE_PREPARED:
1608         case SNDRV_PCM_STATE_PAUSED:
1609         case SNDRV_PCM_STATE_SUSPENDED:
1610                 return 0;
1611         default:
1612                 return -EBADFD;
1613         }
1614 }
1615
1616 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1617 {
1618         struct snd_pcm_runtime *runtime = substream->runtime;
1619         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1620         if (err < 0)
1621                 return err;
1622         runtime->hw_ptr_base = 0;
1623         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1624                 runtime->status->hw_ptr % runtime->period_size;
1625         runtime->silence_start = runtime->status->hw_ptr;
1626         runtime->silence_filled = 0;
1627         return 0;
1628 }
1629
1630 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1631 {
1632         struct snd_pcm_runtime *runtime = substream->runtime;
1633         runtime->control->appl_ptr = runtime->status->hw_ptr;
1634         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1635             runtime->silence_size > 0)
1636                 snd_pcm_playback_silence(substream, ULONG_MAX);
1637 }
1638
1639 static const struct action_ops snd_pcm_action_reset = {
1640         .pre_action = snd_pcm_pre_reset,
1641         .do_action = snd_pcm_do_reset,
1642         .post_action = snd_pcm_post_reset
1643 };
1644
1645 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1646 {
1647         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1648 }
1649
1650 /*
1651  * prepare ioctl
1652  */
1653 /* we use the second argument for updating f_flags */
1654 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1655                                int f_flags)
1656 {
1657         struct snd_pcm_runtime *runtime = substream->runtime;
1658         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1659             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1660                 return -EBADFD;
1661         if (snd_pcm_running(substream))
1662                 return -EBUSY;
1663         substream->f_flags = f_flags;
1664         return 0;
1665 }
1666
1667 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1668 {
1669         int err;
1670         err = substream->ops->prepare(substream);
1671         if (err < 0)
1672                 return err;
1673         return snd_pcm_do_reset(substream, 0);
1674 }
1675
1676 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1677 {
1678         struct snd_pcm_runtime *runtime = substream->runtime;
1679         runtime->control->appl_ptr = runtime->status->hw_ptr;
1680         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1681 }
1682
1683 static const struct action_ops snd_pcm_action_prepare = {
1684         .pre_action = snd_pcm_pre_prepare,
1685         .do_action = snd_pcm_do_prepare,
1686         .post_action = snd_pcm_post_prepare
1687 };
1688
1689 /**
1690  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1691  * @substream: the PCM substream instance
1692  * @file: file to refer f_flags
1693  *
1694  * Return: Zero if successful, or a negative error code.
1695  */
1696 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1697                            struct file *file)
1698 {
1699         int f_flags;
1700
1701         if (file)
1702                 f_flags = file->f_flags;
1703         else
1704                 f_flags = substream->f_flags;
1705
1706         snd_pcm_stream_lock_irq(substream);
1707         switch (substream->runtime->status->state) {
1708         case SNDRV_PCM_STATE_PAUSED:
1709                 snd_pcm_pause(substream, 0);
1710                 /* fallthru */
1711         case SNDRV_PCM_STATE_SUSPENDED:
1712                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1713                 break;
1714         }
1715         snd_pcm_stream_unlock_irq(substream);
1716
1717         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1718                                         substream, f_flags);
1719 }
1720
1721 /*
1722  * drain ioctl
1723  */
1724
1725 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1726 {
1727         struct snd_pcm_runtime *runtime = substream->runtime;
1728         switch (runtime->status->state) {
1729         case SNDRV_PCM_STATE_OPEN:
1730         case SNDRV_PCM_STATE_DISCONNECTED:
1731         case SNDRV_PCM_STATE_SUSPENDED:
1732                 return -EBADFD;
1733         }
1734         runtime->trigger_master = substream;
1735         return 0;
1736 }
1737
1738 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1739 {
1740         struct snd_pcm_runtime *runtime = substream->runtime;
1741         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1742                 switch (runtime->status->state) {
1743                 case SNDRV_PCM_STATE_PREPARED:
1744                         /* start playback stream if possible */
1745                         if (! snd_pcm_playback_empty(substream)) {
1746                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1747                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1748                         } else {
1749                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1750                         }
1751                         break;
1752                 case SNDRV_PCM_STATE_RUNNING:
1753                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1754                         break;
1755                 case SNDRV_PCM_STATE_XRUN:
1756                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1757                         break;
1758                 default:
1759                         break;
1760                 }
1761         } else {
1762                 /* stop running stream */
1763                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1764                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1765                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1766                         snd_pcm_do_stop(substream, new_state);
1767                         snd_pcm_post_stop(substream, new_state);
1768                 }
1769         }
1770
1771         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1772             runtime->trigger_master == substream &&
1773             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1774                 return substream->ops->trigger(substream,
1775                                                SNDRV_PCM_TRIGGER_DRAIN);
1776
1777         return 0;
1778 }
1779
1780 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1781 {
1782 }
1783
1784 static const struct action_ops snd_pcm_action_drain_init = {
1785         .pre_action = snd_pcm_pre_drain_init,
1786         .do_action = snd_pcm_do_drain_init,
1787         .post_action = snd_pcm_post_drain_init
1788 };
1789
1790 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1791
1792 /*
1793  * Drain the stream(s).
1794  * When the substream is linked, sync until the draining of all playback streams
1795  * is finished.
1796  * After this call, all streams are supposed to be either SETUP or DRAINING
1797  * (capture only) state.
1798  */
1799 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1800                          struct file *file)
1801 {
1802         struct snd_card *card;
1803         struct snd_pcm_runtime *runtime;
1804         struct snd_pcm_substream *s;
1805         wait_queue_entry_t wait;
1806         int result = 0;
1807         int nonblock = 0;
1808
1809         card = substream->pcm->card;
1810         runtime = substream->runtime;
1811
1812         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1813                 return -EBADFD;
1814
1815         if (file) {
1816                 if (file->f_flags & O_NONBLOCK)
1817                         nonblock = 1;
1818         } else if (substream->f_flags & O_NONBLOCK)
1819                 nonblock = 1;
1820
1821         down_read(&snd_pcm_link_rwsem);
1822         snd_pcm_stream_lock_irq(substream);
1823         /* resume pause */
1824         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1825                 snd_pcm_pause(substream, 0);
1826
1827         /* pre-start/stop - all running streams are changed to DRAINING state */
1828         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1829         if (result < 0)
1830                 goto unlock;
1831         /* in non-blocking, we don't wait in ioctl but let caller poll */
1832         if (nonblock) {
1833                 result = -EAGAIN;
1834                 goto unlock;
1835         }
1836
1837         for (;;) {
1838                 long tout;
1839                 struct snd_pcm_runtime *to_check;
1840                 if (signal_pending(current)) {
1841                         result = -ERESTARTSYS;
1842                         break;
1843                 }
1844                 /* find a substream to drain */
1845                 to_check = NULL;
1846                 snd_pcm_group_for_each_entry(s, substream) {
1847                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1848                                 continue;
1849                         runtime = s->runtime;
1850                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1851                                 to_check = runtime;
1852                                 break;
1853                         }
1854                 }
1855                 if (!to_check)
1856                         break; /* all drained */
1857                 init_waitqueue_entry(&wait, current);
1858                 add_wait_queue(&to_check->sleep, &wait);
1859                 snd_pcm_stream_unlock_irq(substream);
1860                 up_read(&snd_pcm_link_rwsem);
1861                 if (runtime->no_period_wakeup)
1862                         tout = MAX_SCHEDULE_TIMEOUT;
1863                 else {
1864                         tout = 10;
1865                         if (runtime->rate) {
1866                                 long t = runtime->period_size * 2 / runtime->rate;
1867                                 tout = max(t, tout);
1868                         }
1869                         tout = msecs_to_jiffies(tout * 1000);
1870                 }
1871                 tout = schedule_timeout_interruptible(tout);
1872                 down_read(&snd_pcm_link_rwsem);
1873                 snd_pcm_stream_lock_irq(substream);
1874                 remove_wait_queue(&to_check->sleep, &wait);
1875                 if (card->shutdown) {
1876                         result = -ENODEV;
1877                         break;
1878                 }
1879                 if (tout == 0) {
1880                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1881                                 result = -ESTRPIPE;
1882                         else {
1883                                 dev_dbg(substream->pcm->card->dev,
1884                                         "playback drain error (DMA or IRQ trouble?)\n");
1885                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1886                                 result = -EIO;
1887                         }
1888                         break;
1889                 }
1890         }
1891
1892  unlock:
1893         snd_pcm_stream_unlock_irq(substream);
1894         up_read(&snd_pcm_link_rwsem);
1895
1896         return result;
1897 }
1898
1899 /*
1900  * drop ioctl
1901  *
1902  * Immediately put all linked substreams into SETUP state.
1903  */
1904 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1905 {
1906         struct snd_pcm_runtime *runtime;
1907         int result = 0;
1908
1909         if (PCM_RUNTIME_CHECK(substream))
1910                 return -ENXIO;
1911         runtime = substream->runtime;
1912
1913         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1914             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1915                 return -EBADFD;
1916
1917         snd_pcm_stream_lock_irq(substream);
1918         /* resume pause */
1919         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1920                 snd_pcm_pause(substream, 0);
1921
1922         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1923         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1924         snd_pcm_stream_unlock_irq(substream);
1925
1926         return result;
1927 }
1928
1929
1930 static bool is_pcm_file(struct file *file)
1931 {
1932         struct inode *inode = file_inode(file);
1933         unsigned int minor;
1934
1935         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1936                 return false;
1937         minor = iminor(inode);
1938         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1939                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1940 }
1941
1942 /*
1943  * PCM link handling
1944  */
1945 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1946 {
1947         int res = 0;
1948         struct snd_pcm_file *pcm_file;
1949         struct snd_pcm_substream *substream1;
1950         struct snd_pcm_group *group;
1951         struct fd f = fdget(fd);
1952
1953         if (!f.file)
1954                 return -EBADFD;
1955         if (!is_pcm_file(f.file)) {
1956                 res = -EBADFD;
1957                 goto _badf;
1958         }
1959         pcm_file = f.file->private_data;
1960         substream1 = pcm_file->substream;
1961         group = kmalloc(sizeof(*group), GFP_KERNEL);
1962         if (!group) {
1963                 res = -ENOMEM;
1964                 goto _nolock;
1965         }
1966         down_write_nonfifo(&snd_pcm_link_rwsem);
1967         write_lock_irq(&snd_pcm_link_rwlock);
1968         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1969             substream->runtime->status->state != substream1->runtime->status->state ||
1970             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1971                 res = -EBADFD;
1972                 goto _end;
1973         }
1974         if (snd_pcm_stream_linked(substream1)) {
1975                 res = -EALREADY;
1976                 goto _end;
1977         }
1978         if (!snd_pcm_stream_linked(substream)) {
1979                 substream->group = group;
1980                 group = NULL;
1981                 spin_lock_init(&substream->group->lock);
1982                 mutex_init(&substream->group->mutex);
1983                 INIT_LIST_HEAD(&substream->group->substreams);
1984                 list_add_tail(&substream->link_list, &substream->group->substreams);
1985                 substream->group->count = 1;
1986         }
1987         list_add_tail(&substream1->link_list, &substream->group->substreams);
1988         substream->group->count++;
1989         substream1->group = substream->group;
1990  _end:
1991         write_unlock_irq(&snd_pcm_link_rwlock);
1992         up_write(&snd_pcm_link_rwsem);
1993  _nolock:
1994         snd_card_unref(substream1->pcm->card);
1995         kfree(group);
1996  _badf:
1997         fdput(f);
1998         return res;
1999 }
2000
2001 static void relink_to_local(struct snd_pcm_substream *substream)
2002 {
2003         substream->group = &substream->self_group;
2004         INIT_LIST_HEAD(&substream->self_group.substreams);
2005         list_add_tail(&substream->link_list, &substream->self_group.substreams);
2006 }
2007
2008 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2009 {
2010         struct snd_pcm_substream *s;
2011         int res = 0;
2012
2013         down_write_nonfifo(&snd_pcm_link_rwsem);
2014         write_lock_irq(&snd_pcm_link_rwlock);
2015         if (!snd_pcm_stream_linked(substream)) {
2016                 res = -EALREADY;
2017                 goto _end;
2018         }
2019         list_del(&substream->link_list);
2020         substream->group->count--;
2021         if (substream->group->count == 1) {     /* detach the last stream, too */
2022                 snd_pcm_group_for_each_entry(s, substream) {
2023                         relink_to_local(s);
2024                         break;
2025                 }
2026                 kfree(substream->group);
2027         }
2028         relink_to_local(substream);
2029        _end:
2030         write_unlock_irq(&snd_pcm_link_rwlock);
2031         up_write(&snd_pcm_link_rwsem);
2032         return res;
2033 }
2034
2035 /*
2036  * hw configurator
2037  */
2038 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2039                                struct snd_pcm_hw_rule *rule)
2040 {
2041         struct snd_interval t;
2042         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2043                      hw_param_interval_c(params, rule->deps[1]), &t);
2044         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2045 }
2046
2047 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2048                                struct snd_pcm_hw_rule *rule)
2049 {
2050         struct snd_interval t;
2051         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2052                      hw_param_interval_c(params, rule->deps[1]), &t);
2053         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2054 }
2055
2056 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2057                                    struct snd_pcm_hw_rule *rule)
2058 {
2059         struct snd_interval t;
2060         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2061                          hw_param_interval_c(params, rule->deps[1]),
2062                          (unsigned long) rule->private, &t);
2063         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2064 }
2065
2066 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2067                                    struct snd_pcm_hw_rule *rule)
2068 {
2069         struct snd_interval t;
2070         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2071                          (unsigned long) rule->private,
2072                          hw_param_interval_c(params, rule->deps[1]), &t);
2073         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2074 }
2075
2076 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2077                                   struct snd_pcm_hw_rule *rule)
2078 {
2079         unsigned int k;
2080         const struct snd_interval *i =
2081                                 hw_param_interval_c(params, rule->deps[0]);
2082         struct snd_mask m;
2083         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2084         snd_mask_any(&m);
2085         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2086                 int bits;
2087                 if (! snd_mask_test(mask, k))
2088                         continue;
2089                 bits = snd_pcm_format_physical_width(k);
2090                 if (bits <= 0)
2091                         continue; /* ignore invalid formats */
2092                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2093                         snd_mask_reset(&m, k);
2094         }
2095         return snd_mask_refine(mask, &m);
2096 }
2097
2098 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2099                                        struct snd_pcm_hw_rule *rule)
2100 {
2101         struct snd_interval t;
2102         unsigned int k;
2103         t.min = UINT_MAX;
2104         t.max = 0;
2105         t.openmin = 0;
2106         t.openmax = 0;
2107         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2108                 int bits;
2109                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2110                         continue;
2111                 bits = snd_pcm_format_physical_width(k);
2112                 if (bits <= 0)
2113                         continue; /* ignore invalid formats */
2114                 if (t.min > (unsigned)bits)
2115                         t.min = bits;
2116                 if (t.max < (unsigned)bits)
2117                         t.max = bits;
2118         }
2119         t.integer = 1;
2120         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2121 }
2122
2123 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2124 #error "Change this table"
2125 #endif
2126
2127 static const unsigned int rates[] = {
2128         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2129         48000, 64000, 88200, 96000, 176400, 192000
2130 };
2131
2132 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2133         .count = ARRAY_SIZE(rates),
2134         .list = rates,
2135 };
2136
2137 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2138                                 struct snd_pcm_hw_rule *rule)
2139 {
2140         struct snd_pcm_hardware *hw = rule->private;
2141         return snd_interval_list(hw_param_interval(params, rule->var),
2142                                  snd_pcm_known_rates.count,
2143                                  snd_pcm_known_rates.list, hw->rates);
2144 }
2145
2146 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2147                                             struct snd_pcm_hw_rule *rule)
2148 {
2149         struct snd_interval t;
2150         struct snd_pcm_substream *substream = rule->private;
2151         t.min = 0;
2152         t.max = substream->buffer_bytes_max;
2153         t.openmin = 0;
2154         t.openmax = 0;
2155         t.integer = 1;
2156         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2157 }
2158
2159 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2160 {
2161         struct snd_pcm_runtime *runtime = substream->runtime;
2162         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2163         int k, err;
2164
2165         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2166                 snd_mask_any(constrs_mask(constrs, k));
2167         }
2168
2169         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2170                 snd_interval_any(constrs_interval(constrs, k));
2171         }
2172
2173         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2174         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2175         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2176         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2177         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2178
2179         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2180                                    snd_pcm_hw_rule_format, NULL,
2181                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2182         if (err < 0)
2183                 return err;
2184         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2185                                   snd_pcm_hw_rule_sample_bits, NULL,
2186                                   SNDRV_PCM_HW_PARAM_FORMAT,
2187                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2188         if (err < 0)
2189                 return err;
2190         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2191                                   snd_pcm_hw_rule_div, NULL,
2192                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2193         if (err < 0)
2194                 return err;
2195         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2196                                   snd_pcm_hw_rule_mul, NULL,
2197                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2198         if (err < 0)
2199                 return err;
2200         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2201                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2202                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2203         if (err < 0)
2204                 return err;
2205         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2206                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2207                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2208         if (err < 0)
2209                 return err;
2210         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2211                                   snd_pcm_hw_rule_div, NULL,
2212                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2213         if (err < 0)
2214                 return err;
2215         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2216                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2217                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2218         if (err < 0)
2219                 return err;
2220         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2221                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2222                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2223         if (err < 0)
2224                 return err;
2225         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2226                                   snd_pcm_hw_rule_div, NULL,
2227                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2228         if (err < 0)
2229                 return err;
2230         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2231                                   snd_pcm_hw_rule_div, NULL,
2232                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2233         if (err < 0)
2234                 return err;
2235         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2236                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2237                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2238         if (err < 0)
2239                 return err;
2240         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2241                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2242                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2243         if (err < 0)
2244                 return err;
2245         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2246                                   snd_pcm_hw_rule_mul, NULL,
2247                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2248         if (err < 0)
2249                 return err;
2250         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2251                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2252                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2253         if (err < 0)
2254                 return err;
2255         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2256                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2257                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2258         if (err < 0)
2259                 return err;
2260         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2261                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2262                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2263         if (err < 0)
2264                 return err;
2265         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2266                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2267                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2268         if (err < 0)
2269                 return err;
2270         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2271                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2272                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2273         if (err < 0)
2274                 return err;
2275         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2276                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2277                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2278         if (err < 0)
2279                 return err;
2280         return 0;
2281 }
2282
2283 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2284 {
2285         struct snd_pcm_runtime *runtime = substream->runtime;
2286         struct snd_pcm_hardware *hw = &runtime->hw;
2287         int err;
2288         unsigned int mask = 0;
2289
2290         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2291                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2292         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2293                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2294         if (hw_support_mmap(substream)) {
2295                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2296                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2297                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2298                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2299                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2300                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2301         }
2302         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2303         if (err < 0)
2304                 return err;
2305
2306         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2307         if (err < 0)
2308                 return err;
2309
2310         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2311         if (err < 0)
2312                 return err;
2313
2314         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2315                                            hw->channels_min, hw->channels_max);
2316         if (err < 0)
2317                 return err;
2318
2319         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2320                                            hw->rate_min, hw->rate_max);
2321         if (err < 0)
2322                 return err;
2323
2324         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2325                                            hw->period_bytes_min, hw->period_bytes_max);
2326         if (err < 0)
2327                 return err;
2328
2329         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2330                                            hw->periods_min, hw->periods_max);
2331         if (err < 0)
2332                 return err;
2333
2334         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2335                                            hw->period_bytes_min, hw->buffer_bytes_max);
2336         if (err < 0)
2337                 return err;
2338
2339         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2340                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2341                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2342         if (err < 0)
2343                 return err;
2344
2345         /* FIXME: remove */
2346         if (runtime->dma_bytes) {
2347                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2348                 if (err < 0)
2349                         return err;
2350         }
2351
2352         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2353                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2354                                           snd_pcm_hw_rule_rate, hw,
2355                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2356                 if (err < 0)
2357                         return err;
2358         }
2359
2360         /* FIXME: this belong to lowlevel */
2361         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2362
2363         return 0;
2364 }
2365
2366 static void pcm_release_private(struct snd_pcm_substream *substream)
2367 {
2368         if (snd_pcm_stream_linked(substream))
2369                 snd_pcm_unlink(substream);
2370 }
2371
2372 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2373 {
2374         substream->ref_count--;
2375         if (substream->ref_count > 0)
2376                 return;
2377
2378         snd_pcm_drop(substream);
2379         if (substream->hw_opened) {
2380                 if (substream->ops->hw_free &&
2381                     substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2382                         substream->ops->hw_free(substream);
2383                 substream->ops->close(substream);
2384                 substream->hw_opened = 0;
2385         }
2386         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2387                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2388         if (substream->pcm_release) {
2389                 substream->pcm_release(substream);
2390                 substream->pcm_release = NULL;
2391         }
2392         snd_pcm_detach_substream(substream);
2393 }
2394 EXPORT_SYMBOL(snd_pcm_release_substream);
2395
2396 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2397                            struct file *file,
2398                            struct snd_pcm_substream **rsubstream)
2399 {
2400         struct snd_pcm_substream *substream;
2401         int err;
2402
2403         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2404         if (err < 0)
2405                 return err;
2406         if (substream->ref_count > 1) {
2407                 *rsubstream = substream;
2408                 return 0;
2409         }
2410
2411         err = snd_pcm_hw_constraints_init(substream);
2412         if (err < 0) {
2413                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2414                 goto error;
2415         }
2416
2417         if ((err = substream->ops->open(substream)) < 0)
2418                 goto error;
2419
2420         substream->hw_opened = 1;
2421
2422         err = snd_pcm_hw_constraints_complete(substream);
2423         if (err < 0) {
2424                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2425                 goto error;
2426         }
2427
2428         *rsubstream = substream;
2429         return 0;
2430
2431  error:
2432         snd_pcm_release_substream(substream);
2433         return err;
2434 }
2435 EXPORT_SYMBOL(snd_pcm_open_substream);
2436
2437 static int snd_pcm_open_file(struct file *file,
2438                              struct snd_pcm *pcm,
2439                              int stream)
2440 {
2441         struct snd_pcm_file *pcm_file;
2442         struct snd_pcm_substream *substream;
2443         int err;
2444
2445         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2446         if (err < 0)
2447                 return err;
2448
2449         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2450         if (pcm_file == NULL) {
2451                 snd_pcm_release_substream(substream);
2452                 return -ENOMEM;
2453         }
2454         pcm_file->substream = substream;
2455         if (substream->ref_count == 1)
2456                 substream->pcm_release = pcm_release_private;
2457         file->private_data = pcm_file;
2458
2459         return 0;
2460 }
2461
2462 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2463 {
2464         struct snd_pcm *pcm;
2465         int err = nonseekable_open(inode, file);
2466         if (err < 0)
2467                 return err;
2468         pcm = snd_lookup_minor_data(iminor(inode),
2469                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2470         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2471         if (pcm)
2472                 snd_card_unref(pcm->card);
2473         return err;
2474 }
2475
2476 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2477 {
2478         struct snd_pcm *pcm;
2479         int err = nonseekable_open(inode, file);
2480         if (err < 0)
2481                 return err;
2482         pcm = snd_lookup_minor_data(iminor(inode),
2483                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2484         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2485         if (pcm)
2486                 snd_card_unref(pcm->card);
2487         return err;
2488 }
2489
2490 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2491 {
2492         int err;
2493         wait_queue_entry_t wait;
2494
2495         if (pcm == NULL) {
2496                 err = -ENODEV;
2497                 goto __error1;
2498         }
2499         err = snd_card_file_add(pcm->card, file);
2500         if (err < 0)
2501                 goto __error1;
2502         if (!try_module_get(pcm->card->module)) {
2503                 err = -EFAULT;
2504                 goto __error2;
2505         }
2506         init_waitqueue_entry(&wait, current);
2507         add_wait_queue(&pcm->open_wait, &wait);
2508         mutex_lock(&pcm->open_mutex);
2509         while (1) {
2510                 err = snd_pcm_open_file(file, pcm, stream);
2511                 if (err >= 0)
2512                         break;
2513                 if (err == -EAGAIN) {
2514                         if (file->f_flags & O_NONBLOCK) {
2515                                 err = -EBUSY;
2516                                 break;
2517                         }
2518                 } else
2519                         break;
2520                 set_current_state(TASK_INTERRUPTIBLE);
2521                 mutex_unlock(&pcm->open_mutex);
2522                 schedule();
2523                 mutex_lock(&pcm->open_mutex);
2524                 if (pcm->card->shutdown) {
2525                         err = -ENODEV;
2526                         break;
2527                 }
2528                 if (signal_pending(current)) {
2529                         err = -ERESTARTSYS;
2530                         break;
2531                 }
2532         }
2533         remove_wait_queue(&pcm->open_wait, &wait);
2534         mutex_unlock(&pcm->open_mutex);
2535         if (err < 0)
2536                 goto __error;
2537         return err;
2538
2539       __error:
2540         module_put(pcm->card->module);
2541       __error2:
2542         snd_card_file_remove(pcm->card, file);
2543       __error1:
2544         return err;
2545 }
2546
2547 static int snd_pcm_release(struct inode *inode, struct file *file)
2548 {
2549         struct snd_pcm *pcm;
2550         struct snd_pcm_substream *substream;
2551         struct snd_pcm_file *pcm_file;
2552
2553         pcm_file = file->private_data;
2554         substream = pcm_file->substream;
2555         if (snd_BUG_ON(!substream))
2556                 return -ENXIO;
2557         pcm = substream->pcm;
2558         mutex_lock(&pcm->open_mutex);
2559         snd_pcm_release_substream(substream);
2560         kfree(pcm_file);
2561         mutex_unlock(&pcm->open_mutex);
2562         wake_up(&pcm->open_wait);
2563         module_put(pcm->card->module);
2564         snd_card_file_remove(pcm->card, file);
2565         return 0;
2566 }
2567
2568 /* check and update PCM state; return 0 or a negative error
2569  * call this inside PCM lock
2570  */
2571 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2572 {
2573         switch (substream->runtime->status->state) {
2574         case SNDRV_PCM_STATE_DRAINING:
2575                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2576                         return -EBADFD;
2577                 /* Fall through */
2578         case SNDRV_PCM_STATE_RUNNING:
2579                 return snd_pcm_update_hw_ptr(substream);
2580         case SNDRV_PCM_STATE_PREPARED:
2581         case SNDRV_PCM_STATE_PAUSED:
2582                 return 0;
2583         case SNDRV_PCM_STATE_SUSPENDED:
2584                 return -ESTRPIPE;
2585         case SNDRV_PCM_STATE_XRUN:
2586                 return -EPIPE;
2587         default:
2588                 return -EBADFD;
2589         }
2590 }
2591
2592 /* increase the appl_ptr; returns the processed frames or a negative error */
2593 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2594                                           snd_pcm_uframes_t frames,
2595                                            snd_pcm_sframes_t avail)
2596 {
2597         struct snd_pcm_runtime *runtime = substream->runtime;
2598         snd_pcm_sframes_t appl_ptr;
2599         int ret;
2600
2601         if (avail <= 0)
2602                 return 0;
2603         if (frames > (snd_pcm_uframes_t)avail)
2604                 frames = avail;
2605         appl_ptr = runtime->control->appl_ptr + frames;
2606         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2607                 appl_ptr -= runtime->boundary;
2608         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2609         return ret < 0 ? ret : frames;
2610 }
2611
2612 /* decrease the appl_ptr; returns the processed frames or zero for error */
2613 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2614                                          snd_pcm_uframes_t frames,
2615                                          snd_pcm_sframes_t avail)
2616 {
2617         struct snd_pcm_runtime *runtime = substream->runtime;
2618         snd_pcm_sframes_t appl_ptr;
2619         int ret;
2620
2621         if (avail <= 0)
2622                 return 0;
2623         if (frames > (snd_pcm_uframes_t)avail)
2624                 frames = avail;
2625         appl_ptr = runtime->control->appl_ptr - frames;
2626         if (appl_ptr < 0)
2627                 appl_ptr += runtime->boundary;
2628         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2629         /* NOTE: we return zero for errors because PulseAudio gets depressed
2630          * upon receiving an error from rewind ioctl and stops processing
2631          * any longer.  Returning zero means that no rewind is done, so
2632          * it's not absolutely wrong to answer like that.
2633          */
2634         return ret < 0 ? 0 : frames;
2635 }
2636
2637 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2638                                         snd_pcm_uframes_t frames)
2639 {
2640         snd_pcm_sframes_t ret;
2641
2642         if (frames == 0)
2643                 return 0;
2644
2645         snd_pcm_stream_lock_irq(substream);
2646         ret = do_pcm_hwsync(substream);
2647         if (!ret)
2648                 ret = rewind_appl_ptr(substream, frames,
2649                                       snd_pcm_hw_avail(substream));
2650         snd_pcm_stream_unlock_irq(substream);
2651         return ret;
2652 }
2653
2654 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2655                                          snd_pcm_uframes_t frames)
2656 {
2657         snd_pcm_sframes_t ret;
2658
2659         if (frames == 0)
2660                 return 0;
2661
2662         snd_pcm_stream_lock_irq(substream);
2663         ret = do_pcm_hwsync(substream);
2664         if (!ret)
2665                 ret = forward_appl_ptr(substream, frames,
2666                                        snd_pcm_avail(substream));
2667         snd_pcm_stream_unlock_irq(substream);
2668         return ret;
2669 }
2670
2671 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2672 {
2673         int err;
2674
2675         snd_pcm_stream_lock_irq(substream);
2676         err = do_pcm_hwsync(substream);
2677         snd_pcm_stream_unlock_irq(substream);
2678         return err;
2679 }
2680
2681 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2682                          snd_pcm_sframes_t *delay)
2683 {
2684         int err;
2685         snd_pcm_sframes_t n = 0;
2686
2687         snd_pcm_stream_lock_irq(substream);
2688         err = do_pcm_hwsync(substream);
2689         if (!err)
2690                 n = snd_pcm_calc_delay(substream);
2691         snd_pcm_stream_unlock_irq(substream);
2692         if (!err)
2693                 *delay = n;
2694         return err;
2695 }
2696
2697 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2698                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2699 {
2700         struct snd_pcm_runtime *runtime = substream->runtime;
2701         struct snd_pcm_sync_ptr sync_ptr;
2702         volatile struct snd_pcm_mmap_status *status;
2703         volatile struct snd_pcm_mmap_control *control;
2704         int err;
2705
2706         memset(&sync_ptr, 0, sizeof(sync_ptr));
2707         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2708                 return -EFAULT;
2709         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2710                 return -EFAULT;
2711         status = runtime->status;
2712         control = runtime->control;
2713         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2714                 err = snd_pcm_hwsync(substream);
2715                 if (err < 0)
2716                         return err;
2717         }
2718         snd_pcm_stream_lock_irq(substream);
2719         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2720                 err = pcm_lib_apply_appl_ptr(substream,
2721                                              sync_ptr.c.control.appl_ptr);
2722                 if (err < 0) {
2723                         snd_pcm_stream_unlock_irq(substream);
2724                         return err;
2725                 }
2726         } else {
2727                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2728         }
2729         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2730                 control->avail_min = sync_ptr.c.control.avail_min;
2731         else
2732                 sync_ptr.c.control.avail_min = control->avail_min;
2733         sync_ptr.s.status.state = status->state;
2734         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2735         sync_ptr.s.status.tstamp = status->tstamp;
2736         sync_ptr.s.status.suspended_state = status->suspended_state;
2737         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2738         snd_pcm_stream_unlock_irq(substream);
2739         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2740                 return -EFAULT;
2741         return 0;
2742 }
2743
2744 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2745 {
2746         struct snd_pcm_runtime *runtime = substream->runtime;
2747         int arg;
2748
2749         if (get_user(arg, _arg))
2750                 return -EFAULT;
2751         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2752                 return -EINVAL;
2753         runtime->tstamp_type = arg;
2754         return 0;
2755 }
2756
2757 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2758                                       struct snd_xferi __user *_xferi)
2759 {
2760         struct snd_xferi xferi;
2761         struct snd_pcm_runtime *runtime = substream->runtime;
2762         snd_pcm_sframes_t result;
2763
2764         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2765                 return -EBADFD;
2766         if (put_user(0, &_xferi->result))
2767                 return -EFAULT;
2768         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2769                 return -EFAULT;
2770         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2771                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2772         else
2773                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2774         __put_user(result, &_xferi->result);
2775         return result < 0 ? result : 0;
2776 }
2777
2778 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2779                                       struct snd_xfern __user *_xfern)
2780 {
2781         struct snd_xfern xfern;
2782         struct snd_pcm_runtime *runtime = substream->runtime;
2783         void *bufs;
2784         snd_pcm_sframes_t result;
2785
2786         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2787                 return -EBADFD;
2788         if (runtime->channels > 128)
2789                 return -EINVAL;
2790         if (put_user(0, &_xfern->result))
2791                 return -EFAULT;
2792         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2793                 return -EFAULT;
2794
2795         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2796         if (IS_ERR(bufs))
2797                 return PTR_ERR(bufs);
2798         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2799                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2800         else
2801                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2802         kfree(bufs);
2803         __put_user(result, &_xfern->result);
2804         return result < 0 ? result : 0;
2805 }
2806
2807 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2808                                 snd_pcm_uframes_t __user *_frames)
2809 {
2810         snd_pcm_uframes_t frames;
2811         snd_pcm_sframes_t result;
2812
2813         if (get_user(frames, _frames))
2814                 return -EFAULT;
2815         if (put_user(0, _frames))
2816                 return -EFAULT;
2817         result = snd_pcm_rewind(substream, frames);
2818         __put_user(result, _frames);
2819         return result < 0 ? result : 0;
2820 }
2821
2822 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2823                                  snd_pcm_uframes_t __user *_frames)
2824 {
2825         snd_pcm_uframes_t frames;
2826         snd_pcm_sframes_t result;
2827
2828         if (get_user(frames, _frames))
2829                 return -EFAULT;
2830         if (put_user(0, _frames))
2831                 return -EFAULT;
2832         result = snd_pcm_forward(substream, frames);
2833         __put_user(result, _frames);
2834         return result < 0 ? result : 0;
2835 }
2836
2837 static int snd_pcm_common_ioctl(struct file *file,
2838                                  struct snd_pcm_substream *substream,
2839                                  unsigned int cmd, void __user *arg)
2840 {
2841         struct snd_pcm_file *pcm_file = file->private_data;
2842         int res;
2843
2844         if (PCM_RUNTIME_CHECK(substream))
2845                 return -ENXIO;
2846
2847         res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2848         if (res < 0)
2849                 return res;
2850
2851         switch (cmd) {
2852         case SNDRV_PCM_IOCTL_PVERSION:
2853                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2854         case SNDRV_PCM_IOCTL_INFO:
2855                 return snd_pcm_info_user(substream, arg);
2856         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2857                 return 0;
2858         case SNDRV_PCM_IOCTL_TTSTAMP:
2859                 return snd_pcm_tstamp(substream, arg);
2860         case SNDRV_PCM_IOCTL_USER_PVERSION:
2861                 if (get_user(pcm_file->user_pversion,
2862                              (unsigned int __user *)arg))
2863                         return -EFAULT;
2864                 return 0;
2865         case SNDRV_PCM_IOCTL_HW_REFINE:
2866                 return snd_pcm_hw_refine_user(substream, arg);
2867         case SNDRV_PCM_IOCTL_HW_PARAMS:
2868                 return snd_pcm_hw_params_user(substream, arg);
2869         case SNDRV_PCM_IOCTL_HW_FREE:
2870                 return snd_pcm_hw_free(substream);
2871         case SNDRV_PCM_IOCTL_SW_PARAMS:
2872                 return snd_pcm_sw_params_user(substream, arg);
2873         case SNDRV_PCM_IOCTL_STATUS:
2874                 return snd_pcm_status_user(substream, arg, false);
2875         case SNDRV_PCM_IOCTL_STATUS_EXT:
2876                 return snd_pcm_status_user(substream, arg, true);
2877         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2878                 return snd_pcm_channel_info_user(substream, arg);
2879         case SNDRV_PCM_IOCTL_PREPARE:
2880                 return snd_pcm_prepare(substream, file);
2881         case SNDRV_PCM_IOCTL_RESET:
2882                 return snd_pcm_reset(substream);
2883         case SNDRV_PCM_IOCTL_START:
2884                 return snd_pcm_start_lock_irq(substream);
2885         case SNDRV_PCM_IOCTL_LINK:
2886                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2887         case SNDRV_PCM_IOCTL_UNLINK:
2888                 return snd_pcm_unlink(substream);
2889         case SNDRV_PCM_IOCTL_RESUME:
2890                 return snd_pcm_resume(substream);
2891         case SNDRV_PCM_IOCTL_XRUN:
2892                 return snd_pcm_xrun(substream);
2893         case SNDRV_PCM_IOCTL_HWSYNC:
2894                 return snd_pcm_hwsync(substream);
2895         case SNDRV_PCM_IOCTL_DELAY:
2896         {
2897                 snd_pcm_sframes_t delay;
2898                 snd_pcm_sframes_t __user *res = arg;
2899                 int err;
2900
2901                 err = snd_pcm_delay(substream, &delay);
2902                 if (err)
2903                         return err;
2904                 if (put_user(delay, res))
2905                         return -EFAULT;
2906                 return 0;
2907         }
2908         case SNDRV_PCM_IOCTL_SYNC_PTR:
2909                 return snd_pcm_sync_ptr(substream, arg);
2910 #ifdef CONFIG_SND_SUPPORT_OLD_API
2911         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2912                 return snd_pcm_hw_refine_old_user(substream, arg);
2913         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2914                 return snd_pcm_hw_params_old_user(substream, arg);
2915 #endif
2916         case SNDRV_PCM_IOCTL_DRAIN:
2917                 return snd_pcm_drain(substream, file);
2918         case SNDRV_PCM_IOCTL_DROP:
2919                 return snd_pcm_drop(substream);
2920         case SNDRV_PCM_IOCTL_PAUSE:
2921                 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2922                                                substream,
2923                                                (int)(unsigned long)arg);
2924         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2925         case SNDRV_PCM_IOCTL_READI_FRAMES:
2926                 return snd_pcm_xferi_frames_ioctl(substream, arg);
2927         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2928         case SNDRV_PCM_IOCTL_READN_FRAMES:
2929                 return snd_pcm_xfern_frames_ioctl(substream, arg);
2930         case SNDRV_PCM_IOCTL_REWIND:
2931                 return snd_pcm_rewind_ioctl(substream, arg);
2932         case SNDRV_PCM_IOCTL_FORWARD:
2933                 return snd_pcm_forward_ioctl(substream, arg);
2934         }
2935         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2936         return -ENOTTY;
2937 }
2938
2939 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2940                           unsigned long arg)
2941 {
2942         struct snd_pcm_file *pcm_file;
2943
2944         pcm_file = file->private_data;
2945
2946         if (((cmd >> 8) & 0xff) != 'A')
2947                 return -ENOTTY;
2948
2949         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2950                                      (void __user *)arg);
2951 }
2952
2953 /**
2954  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2955  * @substream: PCM substream
2956  * @cmd: IOCTL cmd
2957  * @arg: IOCTL argument
2958  *
2959  * The function is provided primarily for OSS layer and USB gadget drivers,
2960  * and it allows only the limited set of ioctls (hw_params, sw_params,
2961  * prepare, start, drain, drop, forward).
2962  */
2963 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2964                          unsigned int cmd, void *arg)
2965 {
2966         snd_pcm_uframes_t *frames = arg;
2967         snd_pcm_sframes_t result;
2968
2969         switch (cmd) {
2970         case SNDRV_PCM_IOCTL_FORWARD:
2971         {
2972                 /* provided only for OSS; capture-only and no value returned */
2973                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
2974                         return -EINVAL;
2975                 result = snd_pcm_forward(substream, *frames);
2976                 return result < 0 ? result : 0;
2977         }
2978         case SNDRV_PCM_IOCTL_HW_PARAMS:
2979                 return snd_pcm_hw_params(substream, arg);
2980         case SNDRV_PCM_IOCTL_SW_PARAMS:
2981                 return snd_pcm_sw_params(substream, arg);
2982         case SNDRV_PCM_IOCTL_PREPARE:
2983                 return snd_pcm_prepare(substream, NULL);
2984         case SNDRV_PCM_IOCTL_START:
2985                 return snd_pcm_start_lock_irq(substream);
2986         case SNDRV_PCM_IOCTL_DRAIN:
2987                 return snd_pcm_drain(substream, NULL);
2988         case SNDRV_PCM_IOCTL_DROP:
2989                 return snd_pcm_drop(substream);
2990         case SNDRV_PCM_IOCTL_DELAY:
2991                 return snd_pcm_delay(substream, frames);
2992         default:
2993                 return -EINVAL;
2994         }
2995 }
2996 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2997
2998 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2999                             loff_t * offset)
3000 {
3001         struct snd_pcm_file *pcm_file;
3002         struct snd_pcm_substream *substream;
3003         struct snd_pcm_runtime *runtime;
3004         snd_pcm_sframes_t result;
3005
3006         pcm_file = file->private_data;
3007         substream = pcm_file->substream;
3008         if (PCM_RUNTIME_CHECK(substream))
3009                 return -ENXIO;
3010         runtime = substream->runtime;
3011         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3012                 return -EBADFD;
3013         if (!frame_aligned(runtime, count))
3014                 return -EINVAL;
3015         count = bytes_to_frames(runtime, count);
3016         result = snd_pcm_lib_read(substream, buf, count);
3017         if (result > 0)
3018                 result = frames_to_bytes(runtime, result);
3019         return result;
3020 }
3021
3022 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3023                              size_t count, loff_t * offset)
3024 {
3025         struct snd_pcm_file *pcm_file;
3026         struct snd_pcm_substream *substream;
3027         struct snd_pcm_runtime *runtime;
3028         snd_pcm_sframes_t result;
3029
3030         pcm_file = file->private_data;
3031         substream = pcm_file->substream;
3032         if (PCM_RUNTIME_CHECK(substream))
3033                 return -ENXIO;
3034         runtime = substream->runtime;
3035         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3036                 return -EBADFD;
3037         if (!frame_aligned(runtime, count))
3038                 return -EINVAL;
3039         count = bytes_to_frames(runtime, count);
3040         result = snd_pcm_lib_write(substream, buf, count);
3041         if (result > 0)
3042                 result = frames_to_bytes(runtime, result);
3043         return result;
3044 }
3045
3046 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3047 {
3048         struct snd_pcm_file *pcm_file;
3049         struct snd_pcm_substream *substream;
3050         struct snd_pcm_runtime *runtime;
3051         snd_pcm_sframes_t result;
3052         unsigned long i;
3053         void __user **bufs;
3054         snd_pcm_uframes_t frames;
3055
3056         pcm_file = iocb->ki_filp->private_data;
3057         substream = pcm_file->substream;
3058         if (PCM_RUNTIME_CHECK(substream))
3059                 return -ENXIO;
3060         runtime = substream->runtime;
3061         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3062                 return -EBADFD;
3063         if (!iter_is_iovec(to))
3064                 return -EINVAL;
3065         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3066                 return -EINVAL;
3067         if (!frame_aligned(runtime, to->iov->iov_len))
3068                 return -EINVAL;
3069         frames = bytes_to_samples(runtime, to->iov->iov_len);
3070         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3071         if (bufs == NULL)
3072                 return -ENOMEM;
3073         for (i = 0; i < to->nr_segs; ++i)
3074                 bufs[i] = to->iov[i].iov_base;
3075         result = snd_pcm_lib_readv(substream, bufs, frames);
3076         if (result > 0)
3077                 result = frames_to_bytes(runtime, result);
3078         kfree(bufs);
3079         return result;
3080 }
3081
3082 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
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(from))
3100                 return -EINVAL;
3101         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3102             !frame_aligned(runtime, from->iov->iov_len))
3103                 return -EINVAL;
3104         frames = bytes_to_samples(runtime, from->iov->iov_len);
3105         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3106         if (bufs == NULL)
3107                 return -ENOMEM;
3108         for (i = 0; i < from->nr_segs; ++i)
3109                 bufs[i] = from->iov[i].iov_base;
3110         result = snd_pcm_lib_writev(substream, bufs, frames);
3111         if (result > 0)
3112                 result = frames_to_bytes(runtime, result);
3113         kfree(bufs);
3114         return result;
3115 }
3116
3117 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3118 {
3119         struct snd_pcm_file *pcm_file;
3120         struct snd_pcm_substream *substream;
3121         struct snd_pcm_runtime *runtime;
3122         __poll_t mask, ok;
3123         snd_pcm_uframes_t avail;
3124
3125         pcm_file = file->private_data;
3126
3127         substream = pcm_file->substream;
3128         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3129                 ok = EPOLLOUT | EPOLLWRNORM;
3130         else
3131                 ok = EPOLLIN | EPOLLRDNORM;
3132         if (PCM_RUNTIME_CHECK(substream))
3133                 return ok | EPOLLERR;
3134
3135         runtime = substream->runtime;
3136         poll_wait(file, &runtime->sleep, wait);
3137
3138         mask = 0;
3139         snd_pcm_stream_lock_irq(substream);
3140         avail = snd_pcm_avail(substream);
3141         switch (runtime->status->state) {
3142         case SNDRV_PCM_STATE_RUNNING:
3143         case SNDRV_PCM_STATE_PREPARED:
3144         case SNDRV_PCM_STATE_PAUSED:
3145                 if (avail >= runtime->control->avail_min)
3146                         mask = ok;
3147                 break;
3148         case SNDRV_PCM_STATE_DRAINING:
3149                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3150                         mask = ok;
3151                         if (!avail)
3152                                 mask |= EPOLLERR;
3153                 }
3154                 break;
3155         default:
3156                 mask = ok | EPOLLERR;
3157                 break;
3158         }
3159         snd_pcm_stream_unlock_irq(substream);
3160         return mask;
3161 }
3162
3163 /*
3164  * mmap support
3165  */
3166
3167 /*
3168  * Only on coherent architectures, we can mmap the status and the control records
3169  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3170  */
3171 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3172 /*
3173  * mmap status record
3174  */
3175 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3176 {
3177         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3178         struct snd_pcm_runtime *runtime;
3179
3180         if (substream == NULL)
3181                 return VM_FAULT_SIGBUS;
3182         runtime = substream->runtime;
3183         vmf->page = virt_to_page(runtime->status);
3184         get_page(vmf->page);
3185         return 0;
3186 }
3187
3188 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3189 {
3190         .fault =        snd_pcm_mmap_status_fault,
3191 };
3192
3193 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3194                                struct vm_area_struct *area)
3195 {
3196         long size;
3197         if (!(area->vm_flags & VM_READ))
3198                 return -EINVAL;
3199         size = area->vm_end - area->vm_start;
3200         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3201                 return -EINVAL;
3202         area->vm_ops = &snd_pcm_vm_ops_status;
3203         area->vm_private_data = substream;
3204         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3205         return 0;
3206 }
3207
3208 /*
3209  * mmap control record
3210  */
3211 static vm_fault_t snd_pcm_mmap_control_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->control);
3220         get_page(vmf->page);
3221         return 0;
3222 }
3223
3224 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3225 {
3226         .fault =        snd_pcm_mmap_control_fault,
3227 };
3228
3229 static int snd_pcm_mmap_control(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_control)))
3237                 return -EINVAL;
3238         area->vm_ops = &snd_pcm_vm_ops_control;
3239         area->vm_private_data = substream;
3240         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3241         return 0;
3242 }
3243
3244 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3245 {
3246         if (pcm_file->no_compat_mmap)
3247                 return false;
3248         /* See pcm_control_mmap_allowed() below.
3249          * Since older alsa-lib requires both status and control mmaps to be
3250          * coupled, we have to disable the status mmap for old alsa-lib, too.
3251          */
3252         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3253             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3254                 return false;
3255         return true;
3256 }
3257
3258 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3259 {
3260         if (pcm_file->no_compat_mmap)
3261                 return false;
3262         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3263          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3264          * thus it effectively assures the manual update of appl_ptr.
3265          */
3266         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3267                 return false;
3268         return true;
3269 }
3270
3271 #else /* ! coherent mmap */
3272 /*
3273  * don't support mmap for status and control records.
3274  */
3275 #define pcm_status_mmap_allowed(pcm_file)       false
3276 #define pcm_control_mmap_allowed(pcm_file)      false
3277
3278 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3279                                struct vm_area_struct *area)
3280 {
3281         return -ENXIO;
3282 }
3283 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3284                                 struct vm_area_struct *area)
3285 {
3286         return -ENXIO;
3287 }
3288 #endif /* coherent mmap */
3289
3290 static inline struct page *
3291 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3292 {
3293         void *vaddr = substream->runtime->dma_area + ofs;
3294         return virt_to_page(vaddr);
3295 }
3296
3297 /*
3298  * fault callback for mmapping a RAM page
3299  */
3300 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3301 {
3302         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3303         struct snd_pcm_runtime *runtime;
3304         unsigned long offset;
3305         struct page * page;
3306         size_t dma_bytes;
3307
3308         if (substream == NULL)
3309                 return VM_FAULT_SIGBUS;
3310         runtime = substream->runtime;
3311         offset = vmf->pgoff << PAGE_SHIFT;
3312         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3313         if (offset > dma_bytes - PAGE_SIZE)
3314                 return VM_FAULT_SIGBUS;
3315         if (substream->ops->page)
3316                 page = substream->ops->page(substream, offset);
3317         else
3318                 page = snd_pcm_default_page_ops(substream, offset);
3319         if (!page)
3320                 return VM_FAULT_SIGBUS;
3321         get_page(page);
3322         vmf->page = page;
3323         return 0;
3324 }
3325
3326 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3327         .open =         snd_pcm_mmap_data_open,
3328         .close =        snd_pcm_mmap_data_close,
3329 };
3330
3331 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3332         .open =         snd_pcm_mmap_data_open,
3333         .close =        snd_pcm_mmap_data_close,
3334         .fault =        snd_pcm_mmap_data_fault,
3335 };
3336
3337 /*
3338  * mmap the DMA buffer on RAM
3339  */
3340
3341 /**
3342  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3343  * @substream: PCM substream
3344  * @area: VMA
3345  *
3346  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3347  * this function is invoked implicitly.
3348  */
3349 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3350                              struct vm_area_struct *area)
3351 {
3352         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3353 #ifdef CONFIG_GENERIC_ALLOCATOR
3354         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3355                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3356                 return remap_pfn_range(area, area->vm_start,
3357                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3358                                 area->vm_end - area->vm_start, area->vm_page_prot);
3359         }
3360 #endif /* CONFIG_GENERIC_ALLOCATOR */
3361 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3362         if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3363             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3364                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3365                                          area,
3366                                          substream->runtime->dma_area,
3367                                          substream->runtime->dma_addr,
3368                                          substream->runtime->dma_bytes);
3369 #endif /* CONFIG_X86 */
3370         /* mmap with fault handler */
3371         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3372         return 0;
3373 }
3374 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3375
3376 /*
3377  * mmap the DMA buffer on I/O memory area
3378  */
3379 #if SNDRV_PCM_INFO_MMAP_IOMEM
3380 /**
3381  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3382  * @substream: PCM substream
3383  * @area: VMA
3384  *
3385  * When your hardware uses the iomapped pages as the hardware buffer and
3386  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3387  * is supposed to work only on limited architectures.
3388  */
3389 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3390                            struct vm_area_struct *area)
3391 {
3392         struct snd_pcm_runtime *runtime = substream->runtime;
3393
3394         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3395         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3396 }
3397 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3398 #endif /* SNDRV_PCM_INFO_MMAP */
3399
3400 /*
3401  * mmap DMA buffer
3402  */
3403 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3404                       struct vm_area_struct *area)
3405 {
3406         struct snd_pcm_runtime *runtime;
3407         long size;
3408         unsigned long offset;
3409         size_t dma_bytes;
3410         int err;
3411
3412         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3413                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3414                         return -EINVAL;
3415         } else {
3416                 if (!(area->vm_flags & VM_READ))
3417                         return -EINVAL;
3418         }
3419         runtime = substream->runtime;
3420         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3421                 return -EBADFD;
3422         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3423                 return -ENXIO;
3424         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3425             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3426                 return -EINVAL;
3427         size = area->vm_end - area->vm_start;
3428         offset = area->vm_pgoff << PAGE_SHIFT;
3429         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3430         if ((size_t)size > dma_bytes)
3431                 return -EINVAL;
3432         if (offset > dma_bytes - size)
3433                 return -EINVAL;
3434
3435         area->vm_ops = &snd_pcm_vm_ops_data;
3436         area->vm_private_data = substream;
3437         if (substream->ops->mmap)
3438                 err = substream->ops->mmap(substream, area);
3439         else
3440                 err = snd_pcm_lib_default_mmap(substream, area);
3441         if (!err)
3442                 atomic_inc(&substream->mmap_count);
3443         return err;
3444 }
3445 EXPORT_SYMBOL(snd_pcm_mmap_data);
3446
3447 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3448 {
3449         struct snd_pcm_file * pcm_file;
3450         struct snd_pcm_substream *substream;
3451         unsigned long offset;
3452
3453         pcm_file = file->private_data;
3454         substream = pcm_file->substream;
3455         if (PCM_RUNTIME_CHECK(substream))
3456                 return -ENXIO;
3457
3458         offset = area->vm_pgoff << PAGE_SHIFT;
3459         switch (offset) {
3460         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3461                 if (!pcm_status_mmap_allowed(pcm_file))
3462                         return -ENXIO;
3463                 return snd_pcm_mmap_status(substream, file, area);
3464         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3465                 if (!pcm_control_mmap_allowed(pcm_file))
3466                         return -ENXIO;
3467                 return snd_pcm_mmap_control(substream, file, area);
3468         default:
3469                 return snd_pcm_mmap_data(substream, file, area);
3470         }
3471         return 0;
3472 }
3473
3474 static int snd_pcm_fasync(int fd, struct file * file, int on)
3475 {
3476         struct snd_pcm_file * pcm_file;
3477         struct snd_pcm_substream *substream;
3478         struct snd_pcm_runtime *runtime;
3479
3480         pcm_file = file->private_data;
3481         substream = pcm_file->substream;
3482         if (PCM_RUNTIME_CHECK(substream))
3483                 return -ENXIO;
3484         runtime = substream->runtime;
3485         return fasync_helper(fd, file, on, &runtime->fasync);
3486 }
3487
3488 /*
3489  * ioctl32 compat
3490  */
3491 #ifdef CONFIG_COMPAT
3492 #include "pcm_compat.c"
3493 #else
3494 #define snd_pcm_ioctl_compat    NULL
3495 #endif
3496
3497 /*
3498  *  To be removed helpers to keep binary compatibility
3499  */
3500
3501 #ifdef CONFIG_SND_SUPPORT_OLD_API
3502 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3503 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3504
3505 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3506                                                struct snd_pcm_hw_params_old *oparams)
3507 {
3508         unsigned int i;
3509
3510         memset(params, 0, sizeof(*params));
3511         params->flags = oparams->flags;
3512         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3513                 params->masks[i].bits[0] = oparams->masks[i];
3514         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3515         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3516         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3517         params->info = oparams->info;
3518         params->msbits = oparams->msbits;
3519         params->rate_num = oparams->rate_num;
3520         params->rate_den = oparams->rate_den;
3521         params->fifo_size = oparams->fifo_size;
3522 }
3523
3524 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3525                                              struct snd_pcm_hw_params *params)
3526 {
3527         unsigned int i;
3528
3529         memset(oparams, 0, sizeof(*oparams));
3530         oparams->flags = params->flags;
3531         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3532                 oparams->masks[i] = params->masks[i].bits[0];
3533         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3534         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3535         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3536         oparams->info = params->info;
3537         oparams->msbits = params->msbits;
3538         oparams->rate_num = params->rate_num;
3539         oparams->rate_den = params->rate_den;
3540         oparams->fifo_size = params->fifo_size;
3541 }
3542
3543 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3544                                       struct snd_pcm_hw_params_old __user * _oparams)
3545 {
3546         struct snd_pcm_hw_params *params;
3547         struct snd_pcm_hw_params_old *oparams = NULL;
3548         int err;
3549
3550         params = kmalloc(sizeof(*params), GFP_KERNEL);
3551         if (!params)
3552                 return -ENOMEM;
3553
3554         oparams = memdup_user(_oparams, sizeof(*oparams));
3555         if (IS_ERR(oparams)) {
3556                 err = PTR_ERR(oparams);
3557                 goto out;
3558         }
3559         snd_pcm_hw_convert_from_old_params(params, oparams);
3560         err = snd_pcm_hw_refine(substream, params);
3561         if (err < 0)
3562                 goto out_old;
3563
3564         err = fixup_unreferenced_params(substream, params);
3565         if (err < 0)
3566                 goto out_old;
3567
3568         snd_pcm_hw_convert_to_old_params(oparams, params);
3569         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3570                 err = -EFAULT;
3571 out_old:
3572         kfree(oparams);
3573 out:
3574         kfree(params);
3575         return err;
3576 }
3577
3578 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3579                                       struct snd_pcm_hw_params_old __user * _oparams)
3580 {
3581         struct snd_pcm_hw_params *params;
3582         struct snd_pcm_hw_params_old *oparams = NULL;
3583         int err;
3584
3585         params = kmalloc(sizeof(*params), GFP_KERNEL);
3586         if (!params)
3587                 return -ENOMEM;
3588
3589         oparams = memdup_user(_oparams, sizeof(*oparams));
3590         if (IS_ERR(oparams)) {
3591                 err = PTR_ERR(oparams);
3592                 goto out;
3593         }
3594
3595         snd_pcm_hw_convert_from_old_params(params, oparams);
3596         err = snd_pcm_hw_params(substream, params);
3597         if (err < 0)
3598                 goto out_old;
3599
3600         snd_pcm_hw_convert_to_old_params(oparams, params);
3601         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3602                 err = -EFAULT;
3603 out_old:
3604         kfree(oparams);
3605 out:
3606         kfree(params);
3607         return err;
3608 }
3609 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3610
3611 #ifndef CONFIG_MMU
3612 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3613                                                unsigned long addr,
3614                                                unsigned long len,
3615                                                unsigned long pgoff,
3616                                                unsigned long flags)
3617 {
3618         struct snd_pcm_file *pcm_file = file->private_data;
3619         struct snd_pcm_substream *substream = pcm_file->substream;
3620         struct snd_pcm_runtime *runtime = substream->runtime;
3621         unsigned long offset = pgoff << PAGE_SHIFT;
3622
3623         switch (offset) {
3624         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3625                 return (unsigned long)runtime->status;
3626         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3627                 return (unsigned long)runtime->control;
3628         default:
3629                 return (unsigned long)runtime->dma_area + offset;
3630         }
3631 }
3632 #else
3633 # define snd_pcm_get_unmapped_area NULL
3634 #endif
3635
3636 /*
3637  *  Register section
3638  */
3639
3640 const struct file_operations snd_pcm_f_ops[2] = {
3641         {
3642                 .owner =                THIS_MODULE,
3643                 .write =                snd_pcm_write,
3644                 .write_iter =           snd_pcm_writev,
3645                 .open =                 snd_pcm_playback_open,
3646                 .release =              snd_pcm_release,
3647                 .llseek =               no_llseek,
3648                 .poll =                 snd_pcm_poll,
3649                 .unlocked_ioctl =       snd_pcm_ioctl,
3650                 .compat_ioctl =         snd_pcm_ioctl_compat,
3651                 .mmap =                 snd_pcm_mmap,
3652                 .fasync =               snd_pcm_fasync,
3653                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3654         },
3655         {
3656                 .owner =                THIS_MODULE,
3657                 .read =                 snd_pcm_read,
3658                 .read_iter =            snd_pcm_readv,
3659                 .open =                 snd_pcm_capture_open,
3660                 .release =              snd_pcm_release,
3661                 .llseek =               no_llseek,
3662                 .poll =                 snd_pcm_poll,
3663                 .unlocked_ioctl =       snd_pcm_ioctl,
3664                 .compat_ioctl =         snd_pcm_ioctl_compat,
3665                 .mmap =                 snd_pcm_mmap,
3666                 .fasync =               snd_pcm_fasync,
3667                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3668         }
3669 };