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 @substream is %NULL), or a negative error
1470  * code.
1471  */
1472 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1473 {
1474         int err;
1475         unsigned long flags;
1476
1477         if (! substream)
1478                 return 0;
1479
1480         snd_pcm_stream_lock_irqsave(substream, flags);
1481         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1482         snd_pcm_stream_unlock_irqrestore(substream, flags);
1483         return err;
1484 }
1485 EXPORT_SYMBOL(snd_pcm_suspend);
1486
1487 /**
1488  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1489  * @pcm: the PCM instance
1490  *
1491  * After this call, all streams are changed to SUSPENDED state.
1492  *
1493  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1494  */
1495 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1496 {
1497         struct snd_pcm_substream *substream;
1498         int stream, err = 0;
1499
1500         if (! pcm)
1501                 return 0;
1502
1503         for (stream = 0; stream < 2; stream++) {
1504                 for (substream = pcm->streams[stream].substream;
1505                      substream; substream = substream->next) {
1506                         /* FIXME: the open/close code should lock this as well */
1507                         if (substream->runtime == NULL)
1508                                 continue;
1509                         err = snd_pcm_suspend(substream);
1510                         if (err < 0 && err != -EBUSY)
1511                                 return err;
1512                 }
1513         }
1514         return 0;
1515 }
1516 EXPORT_SYMBOL(snd_pcm_suspend_all);
1517
1518 /* resume */
1519
1520 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1521 {
1522         struct snd_pcm_runtime *runtime = substream->runtime;
1523         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1524                 return -ENOSYS;
1525         runtime->trigger_master = substream;
1526         return 0;
1527 }
1528
1529 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1530 {
1531         struct snd_pcm_runtime *runtime = substream->runtime;
1532         if (runtime->trigger_master != substream)
1533                 return 0;
1534         /* DMA not running previously? */
1535         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1536             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1537              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1538                 return 0;
1539         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1540 }
1541
1542 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1543 {
1544         if (substream->runtime->trigger_master == substream &&
1545             snd_pcm_running(substream))
1546                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1547 }
1548
1549 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1550 {
1551         struct snd_pcm_runtime *runtime = substream->runtime;
1552         snd_pcm_trigger_tstamp(substream);
1553         runtime->status->state = runtime->status->suspended_state;
1554         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1555 }
1556
1557 static const struct action_ops snd_pcm_action_resume = {
1558         .pre_action = snd_pcm_pre_resume,
1559         .do_action = snd_pcm_do_resume,
1560         .undo_action = snd_pcm_undo_resume,
1561         .post_action = snd_pcm_post_resume
1562 };
1563
1564 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1565 {
1566         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1567 }
1568
1569 #else
1570
1571 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1572 {
1573         return -ENOSYS;
1574 }
1575
1576 #endif /* CONFIG_PM */
1577
1578 /*
1579  * xrun ioctl
1580  *
1581  * Change the RUNNING stream(s) to XRUN state.
1582  */
1583 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1584 {
1585         struct snd_pcm_runtime *runtime = substream->runtime;
1586         int result;
1587
1588         snd_pcm_stream_lock_irq(substream);
1589         switch (runtime->status->state) {
1590         case SNDRV_PCM_STATE_XRUN:
1591                 result = 0;     /* already there */
1592                 break;
1593         case SNDRV_PCM_STATE_RUNNING:
1594                 __snd_pcm_xrun(substream);
1595                 result = 0;
1596                 break;
1597         default:
1598                 result = -EBADFD;
1599         }
1600         snd_pcm_stream_unlock_irq(substream);
1601         return result;
1602 }
1603
1604 /*
1605  * reset ioctl
1606  */
1607 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1608 {
1609         struct snd_pcm_runtime *runtime = substream->runtime;
1610         switch (runtime->status->state) {
1611         case SNDRV_PCM_STATE_RUNNING:
1612         case SNDRV_PCM_STATE_PREPARED:
1613         case SNDRV_PCM_STATE_PAUSED:
1614         case SNDRV_PCM_STATE_SUSPENDED:
1615                 return 0;
1616         default:
1617                 return -EBADFD;
1618         }
1619 }
1620
1621 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1622 {
1623         struct snd_pcm_runtime *runtime = substream->runtime;
1624         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1625         if (err < 0)
1626                 return err;
1627         runtime->hw_ptr_base = 0;
1628         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1629                 runtime->status->hw_ptr % runtime->period_size;
1630         runtime->silence_start = runtime->status->hw_ptr;
1631         runtime->silence_filled = 0;
1632         return 0;
1633 }
1634
1635 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1636 {
1637         struct snd_pcm_runtime *runtime = substream->runtime;
1638         runtime->control->appl_ptr = runtime->status->hw_ptr;
1639         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1640             runtime->silence_size > 0)
1641                 snd_pcm_playback_silence(substream, ULONG_MAX);
1642 }
1643
1644 static const struct action_ops snd_pcm_action_reset = {
1645         .pre_action = snd_pcm_pre_reset,
1646         .do_action = snd_pcm_do_reset,
1647         .post_action = snd_pcm_post_reset
1648 };
1649
1650 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1651 {
1652         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1653 }
1654
1655 /*
1656  * prepare ioctl
1657  */
1658 /* we use the second argument for updating f_flags */
1659 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1660                                int f_flags)
1661 {
1662         struct snd_pcm_runtime *runtime = substream->runtime;
1663         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1664             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1665                 return -EBADFD;
1666         if (snd_pcm_running(substream))
1667                 return -EBUSY;
1668         substream->f_flags = f_flags;
1669         return 0;
1670 }
1671
1672 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1673 {
1674         int err;
1675         err = substream->ops->prepare(substream);
1676         if (err < 0)
1677                 return err;
1678         return snd_pcm_do_reset(substream, 0);
1679 }
1680
1681 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1682 {
1683         struct snd_pcm_runtime *runtime = substream->runtime;
1684         runtime->control->appl_ptr = runtime->status->hw_ptr;
1685         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1686 }
1687
1688 static const struct action_ops snd_pcm_action_prepare = {
1689         .pre_action = snd_pcm_pre_prepare,
1690         .do_action = snd_pcm_do_prepare,
1691         .post_action = snd_pcm_post_prepare
1692 };
1693
1694 /**
1695  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1696  * @substream: the PCM substream instance
1697  * @file: file to refer f_flags
1698  *
1699  * Return: Zero if successful, or a negative error code.
1700  */
1701 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1702                            struct file *file)
1703 {
1704         int f_flags;
1705
1706         if (file)
1707                 f_flags = file->f_flags;
1708         else
1709                 f_flags = substream->f_flags;
1710
1711         snd_pcm_stream_lock_irq(substream);
1712         switch (substream->runtime->status->state) {
1713         case SNDRV_PCM_STATE_PAUSED:
1714                 snd_pcm_pause(substream, 0);
1715                 /* fallthru */
1716         case SNDRV_PCM_STATE_SUSPENDED:
1717                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1718                 break;
1719         }
1720         snd_pcm_stream_unlock_irq(substream);
1721
1722         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1723                                         substream, f_flags);
1724 }
1725
1726 /*
1727  * drain ioctl
1728  */
1729
1730 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1731 {
1732         struct snd_pcm_runtime *runtime = substream->runtime;
1733         switch (runtime->status->state) {
1734         case SNDRV_PCM_STATE_OPEN:
1735         case SNDRV_PCM_STATE_DISCONNECTED:
1736         case SNDRV_PCM_STATE_SUSPENDED:
1737                 return -EBADFD;
1738         }
1739         runtime->trigger_master = substream;
1740         return 0;
1741 }
1742
1743 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1744 {
1745         struct snd_pcm_runtime *runtime = substream->runtime;
1746         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1747                 switch (runtime->status->state) {
1748                 case SNDRV_PCM_STATE_PREPARED:
1749                         /* start playback stream if possible */
1750                         if (! snd_pcm_playback_empty(substream)) {
1751                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1752                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1753                         } else {
1754                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1755                         }
1756                         break;
1757                 case SNDRV_PCM_STATE_RUNNING:
1758                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1759                         break;
1760                 case SNDRV_PCM_STATE_XRUN:
1761                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1762                         break;
1763                 default:
1764                         break;
1765                 }
1766         } else {
1767                 /* stop running stream */
1768                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1769                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1770                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1771                         snd_pcm_do_stop(substream, new_state);
1772                         snd_pcm_post_stop(substream, new_state);
1773                 }
1774         }
1775
1776         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1777             runtime->trigger_master == substream &&
1778             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1779                 return substream->ops->trigger(substream,
1780                                                SNDRV_PCM_TRIGGER_DRAIN);
1781
1782         return 0;
1783 }
1784
1785 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1786 {
1787 }
1788
1789 static const struct action_ops snd_pcm_action_drain_init = {
1790         .pre_action = snd_pcm_pre_drain_init,
1791         .do_action = snd_pcm_do_drain_init,
1792         .post_action = snd_pcm_post_drain_init
1793 };
1794
1795 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1796
1797 /*
1798  * Drain the stream(s).
1799  * When the substream is linked, sync until the draining of all playback streams
1800  * is finished.
1801  * After this call, all streams are supposed to be either SETUP or DRAINING
1802  * (capture only) state.
1803  */
1804 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1805                          struct file *file)
1806 {
1807         struct snd_card *card;
1808         struct snd_pcm_runtime *runtime;
1809         struct snd_pcm_substream *s;
1810         wait_queue_entry_t wait;
1811         int result = 0;
1812         int nonblock = 0;
1813
1814         card = substream->pcm->card;
1815         runtime = substream->runtime;
1816
1817         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1818                 return -EBADFD;
1819
1820         if (file) {
1821                 if (file->f_flags & O_NONBLOCK)
1822                         nonblock = 1;
1823         } else if (substream->f_flags & O_NONBLOCK)
1824                 nonblock = 1;
1825
1826         down_read(&snd_pcm_link_rwsem);
1827         snd_pcm_stream_lock_irq(substream);
1828         /* resume pause */
1829         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1830                 snd_pcm_pause(substream, 0);
1831
1832         /* pre-start/stop - all running streams are changed to DRAINING state */
1833         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1834         if (result < 0)
1835                 goto unlock;
1836         /* in non-blocking, we don't wait in ioctl but let caller poll */
1837         if (nonblock) {
1838                 result = -EAGAIN;
1839                 goto unlock;
1840         }
1841
1842         for (;;) {
1843                 long tout;
1844                 struct snd_pcm_runtime *to_check;
1845                 if (signal_pending(current)) {
1846                         result = -ERESTARTSYS;
1847                         break;
1848                 }
1849                 /* find a substream to drain */
1850                 to_check = NULL;
1851                 snd_pcm_group_for_each_entry(s, substream) {
1852                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1853                                 continue;
1854                         runtime = s->runtime;
1855                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1856                                 to_check = runtime;
1857                                 break;
1858                         }
1859                 }
1860                 if (!to_check)
1861                         break; /* all drained */
1862                 init_waitqueue_entry(&wait, current);
1863                 add_wait_queue(&to_check->sleep, &wait);
1864                 snd_pcm_stream_unlock_irq(substream);
1865                 up_read(&snd_pcm_link_rwsem);
1866                 if (runtime->no_period_wakeup)
1867                         tout = MAX_SCHEDULE_TIMEOUT;
1868                 else {
1869                         tout = 10;
1870                         if (runtime->rate) {
1871                                 long t = runtime->period_size * 2 / runtime->rate;
1872                                 tout = max(t, tout);
1873                         }
1874                         tout = msecs_to_jiffies(tout * 1000);
1875                 }
1876                 tout = schedule_timeout_interruptible(tout);
1877                 down_read(&snd_pcm_link_rwsem);
1878                 snd_pcm_stream_lock_irq(substream);
1879                 remove_wait_queue(&to_check->sleep, &wait);
1880                 if (card->shutdown) {
1881                         result = -ENODEV;
1882                         break;
1883                 }
1884                 if (tout == 0) {
1885                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1886                                 result = -ESTRPIPE;
1887                         else {
1888                                 dev_dbg(substream->pcm->card->dev,
1889                                         "playback drain error (DMA or IRQ trouble?)\n");
1890                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1891                                 result = -EIO;
1892                         }
1893                         break;
1894                 }
1895         }
1896
1897  unlock:
1898         snd_pcm_stream_unlock_irq(substream);
1899         up_read(&snd_pcm_link_rwsem);
1900
1901         return result;
1902 }
1903
1904 /*
1905  * drop ioctl
1906  *
1907  * Immediately put all linked substreams into SETUP state.
1908  */
1909 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1910 {
1911         struct snd_pcm_runtime *runtime;
1912         int result = 0;
1913
1914         if (PCM_RUNTIME_CHECK(substream))
1915                 return -ENXIO;
1916         runtime = substream->runtime;
1917
1918         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1919             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1920                 return -EBADFD;
1921
1922         snd_pcm_stream_lock_irq(substream);
1923         /* resume pause */
1924         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1925                 snd_pcm_pause(substream, 0);
1926
1927         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1928         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1929         snd_pcm_stream_unlock_irq(substream);
1930
1931         return result;
1932 }
1933
1934
1935 static bool is_pcm_file(struct file *file)
1936 {
1937         struct inode *inode = file_inode(file);
1938         struct snd_pcm *pcm;
1939         unsigned int minor;
1940
1941         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1942                 return false;
1943         minor = iminor(inode);
1944         pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
1945         if (!pcm)
1946                 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1947         if (!pcm)
1948                 return false;
1949         snd_card_unref(pcm->card);
1950         return true;
1951 }
1952
1953 /*
1954  * PCM link handling
1955  */
1956 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1957 {
1958         int res = 0;
1959         struct snd_pcm_file *pcm_file;
1960         struct snd_pcm_substream *substream1;
1961         struct snd_pcm_group *group;
1962         struct fd f = fdget(fd);
1963
1964         if (!f.file)
1965                 return -EBADFD;
1966         if (!is_pcm_file(f.file)) {
1967                 res = -EBADFD;
1968                 goto _badf;
1969         }
1970         pcm_file = f.file->private_data;
1971         substream1 = pcm_file->substream;
1972         group = kmalloc(sizeof(*group), GFP_KERNEL);
1973         if (!group) {
1974                 res = -ENOMEM;
1975                 goto _nolock;
1976         }
1977         down_write_nonfifo(&snd_pcm_link_rwsem);
1978         write_lock_irq(&snd_pcm_link_rwlock);
1979         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1980             substream->runtime->status->state != substream1->runtime->status->state ||
1981             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1982                 res = -EBADFD;
1983                 goto _end;
1984         }
1985         if (snd_pcm_stream_linked(substream1)) {
1986                 res = -EALREADY;
1987                 goto _end;
1988         }
1989         if (!snd_pcm_stream_linked(substream)) {
1990                 substream->group = group;
1991                 group = NULL;
1992                 spin_lock_init(&substream->group->lock);
1993                 mutex_init(&substream->group->mutex);
1994                 INIT_LIST_HEAD(&substream->group->substreams);
1995                 list_add_tail(&substream->link_list, &substream->group->substreams);
1996                 substream->group->count = 1;
1997         }
1998         list_add_tail(&substream1->link_list, &substream->group->substreams);
1999         substream->group->count++;
2000         substream1->group = substream->group;
2001  _end:
2002         write_unlock_irq(&snd_pcm_link_rwlock);
2003         up_write(&snd_pcm_link_rwsem);
2004  _nolock:
2005         kfree(group);
2006  _badf:
2007         fdput(f);
2008         return res;
2009 }
2010
2011 static void relink_to_local(struct snd_pcm_substream *substream)
2012 {
2013         substream->group = &substream->self_group;
2014         INIT_LIST_HEAD(&substream->self_group.substreams);
2015         list_add_tail(&substream->link_list, &substream->self_group.substreams);
2016 }
2017
2018 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2019 {
2020         struct snd_pcm_substream *s;
2021         int res = 0;
2022
2023         down_write_nonfifo(&snd_pcm_link_rwsem);
2024         write_lock_irq(&snd_pcm_link_rwlock);
2025         if (!snd_pcm_stream_linked(substream)) {
2026                 res = -EALREADY;
2027                 goto _end;
2028         }
2029         list_del(&substream->link_list);
2030         substream->group->count--;
2031         if (substream->group->count == 1) {     /* detach the last stream, too */
2032                 snd_pcm_group_for_each_entry(s, substream) {
2033                         relink_to_local(s);
2034                         break;
2035                 }
2036                 kfree(substream->group);
2037         }
2038         relink_to_local(substream);
2039        _end:
2040         write_unlock_irq(&snd_pcm_link_rwlock);
2041         up_write(&snd_pcm_link_rwsem);
2042         return res;
2043 }
2044
2045 /*
2046  * hw configurator
2047  */
2048 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2049                                struct snd_pcm_hw_rule *rule)
2050 {
2051         struct snd_interval t;
2052         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2053                      hw_param_interval_c(params, rule->deps[1]), &t);
2054         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2055 }
2056
2057 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2058                                struct snd_pcm_hw_rule *rule)
2059 {
2060         struct snd_interval t;
2061         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2062                      hw_param_interval_c(params, rule->deps[1]), &t);
2063         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2064 }
2065
2066 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2067                                    struct snd_pcm_hw_rule *rule)
2068 {
2069         struct snd_interval t;
2070         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2071                          hw_param_interval_c(params, rule->deps[1]),
2072                          (unsigned long) rule->private, &t);
2073         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2074 }
2075
2076 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2077                                    struct snd_pcm_hw_rule *rule)
2078 {
2079         struct snd_interval t;
2080         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2081                          (unsigned long) rule->private,
2082                          hw_param_interval_c(params, rule->deps[1]), &t);
2083         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2084 }
2085
2086 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2087                                   struct snd_pcm_hw_rule *rule)
2088 {
2089         unsigned int k;
2090         const struct snd_interval *i =
2091                                 hw_param_interval_c(params, rule->deps[0]);
2092         struct snd_mask m;
2093         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2094         snd_mask_any(&m);
2095         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2096                 int bits;
2097                 if (! snd_mask_test(mask, k))
2098                         continue;
2099                 bits = snd_pcm_format_physical_width(k);
2100                 if (bits <= 0)
2101                         continue; /* ignore invalid formats */
2102                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2103                         snd_mask_reset(&m, k);
2104         }
2105         return snd_mask_refine(mask, &m);
2106 }
2107
2108 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2109                                        struct snd_pcm_hw_rule *rule)
2110 {
2111         struct snd_interval t;
2112         unsigned int k;
2113         t.min = UINT_MAX;
2114         t.max = 0;
2115         t.openmin = 0;
2116         t.openmax = 0;
2117         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2118                 int bits;
2119                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2120                         continue;
2121                 bits = snd_pcm_format_physical_width(k);
2122                 if (bits <= 0)
2123                         continue; /* ignore invalid formats */
2124                 if (t.min > (unsigned)bits)
2125                         t.min = bits;
2126                 if (t.max < (unsigned)bits)
2127                         t.max = bits;
2128         }
2129         t.integer = 1;
2130         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2131 }
2132
2133 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2134 #error "Change this table"
2135 #endif
2136
2137 static const unsigned int rates[] = {
2138         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2139         48000, 64000, 88200, 96000, 176400, 192000
2140 };
2141
2142 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2143         .count = ARRAY_SIZE(rates),
2144         .list = rates,
2145 };
2146
2147 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2148                                 struct snd_pcm_hw_rule *rule)
2149 {
2150         struct snd_pcm_hardware *hw = rule->private;
2151         return snd_interval_list(hw_param_interval(params, rule->var),
2152                                  snd_pcm_known_rates.count,
2153                                  snd_pcm_known_rates.list, hw->rates);
2154 }
2155
2156 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2157                                             struct snd_pcm_hw_rule *rule)
2158 {
2159         struct snd_interval t;
2160         struct snd_pcm_substream *substream = rule->private;
2161         t.min = 0;
2162         t.max = substream->buffer_bytes_max;
2163         t.openmin = 0;
2164         t.openmax = 0;
2165         t.integer = 1;
2166         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2167 }
2168
2169 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2170 {
2171         struct snd_pcm_runtime *runtime = substream->runtime;
2172         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2173         int k, err;
2174
2175         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2176                 snd_mask_any(constrs_mask(constrs, k));
2177         }
2178
2179         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2180                 snd_interval_any(constrs_interval(constrs, k));
2181         }
2182
2183         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2184         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2185         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2186         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2187         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2188
2189         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2190                                    snd_pcm_hw_rule_format, NULL,
2191                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2192         if (err < 0)
2193                 return err;
2194         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2195                                   snd_pcm_hw_rule_sample_bits, NULL,
2196                                   SNDRV_PCM_HW_PARAM_FORMAT,
2197                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2198         if (err < 0)
2199                 return err;
2200         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2201                                   snd_pcm_hw_rule_div, NULL,
2202                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -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_mul, NULL,
2207                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2208         if (err < 0)
2209                 return err;
2210         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2211                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2212                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2213         if (err < 0)
2214                 return err;
2215         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2216                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2217                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2218         if (err < 0)
2219                 return err;
2220         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2221                                   snd_pcm_hw_rule_div, NULL,
2222                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2223         if (err < 0)
2224                 return err;
2225         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2226                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2227                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2228         if (err < 0)
2229                 return err;
2230         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2231                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2232                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2233         if (err < 0)
2234                 return err;
2235         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2236                                   snd_pcm_hw_rule_div, NULL,
2237                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -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_div, NULL,
2242                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2243         if (err < 0)
2244                 return err;
2245         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2246                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2247                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2248         if (err < 0)
2249                 return err;
2250         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2251                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2252                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -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_mul, NULL,
2257                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2258         if (err < 0)
2259                 return err;
2260         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2261                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2262                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 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_SIZE,
2266                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2267                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2268         if (err < 0)
2269                 return err;
2270         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2271                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2272                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2273         if (err < 0)
2274                 return err;
2275         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2276                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2277                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2278         if (err < 0)
2279                 return err;
2280         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2281                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2282                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2283         if (err < 0)
2284                 return err;
2285         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2286                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2287                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2288         if (err < 0)
2289                 return err;
2290         return 0;
2291 }
2292
2293 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2294 {
2295         struct snd_pcm_runtime *runtime = substream->runtime;
2296         struct snd_pcm_hardware *hw = &runtime->hw;
2297         int err;
2298         unsigned int mask = 0;
2299
2300         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2301                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2302         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2303                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2304         if (hw_support_mmap(substream)) {
2305                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2306                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2307                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2308                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2309                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2310                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2311         }
2312         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2313         if (err < 0)
2314                 return err;
2315
2316         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2317         if (err < 0)
2318                 return err;
2319
2320         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2321         if (err < 0)
2322                 return err;
2323
2324         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2325                                            hw->channels_min, hw->channels_max);
2326         if (err < 0)
2327                 return err;
2328
2329         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2330                                            hw->rate_min, hw->rate_max);
2331         if (err < 0)
2332                 return err;
2333
2334         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2335                                            hw->period_bytes_min, hw->period_bytes_max);
2336         if (err < 0)
2337                 return err;
2338
2339         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2340                                            hw->periods_min, hw->periods_max);
2341         if (err < 0)
2342                 return err;
2343
2344         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2345                                            hw->period_bytes_min, hw->buffer_bytes_max);
2346         if (err < 0)
2347                 return err;
2348
2349         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2350                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2351                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2352         if (err < 0)
2353                 return err;
2354
2355         /* FIXME: remove */
2356         if (runtime->dma_bytes) {
2357                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2358                 if (err < 0)
2359                         return err;
2360         }
2361
2362         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2363                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2364                                           snd_pcm_hw_rule_rate, hw,
2365                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2366                 if (err < 0)
2367                         return err;
2368         }
2369
2370         /* FIXME: this belong to lowlevel */
2371         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2372
2373         return 0;
2374 }
2375
2376 static void pcm_release_private(struct snd_pcm_substream *substream)
2377 {
2378         if (snd_pcm_stream_linked(substream))
2379                 snd_pcm_unlink(substream);
2380 }
2381
2382 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2383 {
2384         substream->ref_count--;
2385         if (substream->ref_count > 0)
2386                 return;
2387
2388         snd_pcm_drop(substream);
2389         if (substream->hw_opened) {
2390                 if (substream->ops->hw_free &&
2391                     substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2392                         substream->ops->hw_free(substream);
2393                 substream->ops->close(substream);
2394                 substream->hw_opened = 0;
2395         }
2396         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2397                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2398         if (substream->pcm_release) {
2399                 substream->pcm_release(substream);
2400                 substream->pcm_release = NULL;
2401         }
2402         snd_pcm_detach_substream(substream);
2403 }
2404 EXPORT_SYMBOL(snd_pcm_release_substream);
2405
2406 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2407                            struct file *file,
2408                            struct snd_pcm_substream **rsubstream)
2409 {
2410         struct snd_pcm_substream *substream;
2411         int err;
2412
2413         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2414         if (err < 0)
2415                 return err;
2416         if (substream->ref_count > 1) {
2417                 *rsubstream = substream;
2418                 return 0;
2419         }
2420
2421         err = snd_pcm_hw_constraints_init(substream);
2422         if (err < 0) {
2423                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2424                 goto error;
2425         }
2426
2427         if ((err = substream->ops->open(substream)) < 0)
2428                 goto error;
2429
2430         substream->hw_opened = 1;
2431
2432         err = snd_pcm_hw_constraints_complete(substream);
2433         if (err < 0) {
2434                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2435                 goto error;
2436         }
2437
2438         *rsubstream = substream;
2439         return 0;
2440
2441  error:
2442         snd_pcm_release_substream(substream);
2443         return err;
2444 }
2445 EXPORT_SYMBOL(snd_pcm_open_substream);
2446
2447 static int snd_pcm_open_file(struct file *file,
2448                              struct snd_pcm *pcm,
2449                              int stream)
2450 {
2451         struct snd_pcm_file *pcm_file;
2452         struct snd_pcm_substream *substream;
2453         int err;
2454
2455         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2456         if (err < 0)
2457                 return err;
2458
2459         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2460         if (pcm_file == NULL) {
2461                 snd_pcm_release_substream(substream);
2462                 return -ENOMEM;
2463         }
2464         pcm_file->substream = substream;
2465         if (substream->ref_count == 1) {
2466                 substream->file = pcm_file;
2467                 substream->pcm_release = pcm_release_private;
2468         }
2469         file->private_data = pcm_file;
2470
2471         return 0;
2472 }
2473
2474 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2475 {
2476         struct snd_pcm *pcm;
2477         int err = nonseekable_open(inode, file);
2478         if (err < 0)
2479                 return err;
2480         pcm = snd_lookup_minor_data(iminor(inode),
2481                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2482         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2483         if (pcm)
2484                 snd_card_unref(pcm->card);
2485         return err;
2486 }
2487
2488 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2489 {
2490         struct snd_pcm *pcm;
2491         int err = nonseekable_open(inode, file);
2492         if (err < 0)
2493                 return err;
2494         pcm = snd_lookup_minor_data(iminor(inode),
2495                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2496         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2497         if (pcm)
2498                 snd_card_unref(pcm->card);
2499         return err;
2500 }
2501
2502 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2503 {
2504         int err;
2505         wait_queue_entry_t wait;
2506
2507         if (pcm == NULL) {
2508                 err = -ENODEV;
2509                 goto __error1;
2510         }
2511         err = snd_card_file_add(pcm->card, file);
2512         if (err < 0)
2513                 goto __error1;
2514         if (!try_module_get(pcm->card->module)) {
2515                 err = -EFAULT;
2516                 goto __error2;
2517         }
2518         init_waitqueue_entry(&wait, current);
2519         add_wait_queue(&pcm->open_wait, &wait);
2520         mutex_lock(&pcm->open_mutex);
2521         while (1) {
2522                 err = snd_pcm_open_file(file, pcm, stream);
2523                 if (err >= 0)
2524                         break;
2525                 if (err == -EAGAIN) {
2526                         if (file->f_flags & O_NONBLOCK) {
2527                                 err = -EBUSY;
2528                                 break;
2529                         }
2530                 } else
2531                         break;
2532                 set_current_state(TASK_INTERRUPTIBLE);
2533                 mutex_unlock(&pcm->open_mutex);
2534                 schedule();
2535                 mutex_lock(&pcm->open_mutex);
2536                 if (pcm->card->shutdown) {
2537                         err = -ENODEV;
2538                         break;
2539                 }
2540                 if (signal_pending(current)) {
2541                         err = -ERESTARTSYS;
2542                         break;
2543                 }
2544         }
2545         remove_wait_queue(&pcm->open_wait, &wait);
2546         mutex_unlock(&pcm->open_mutex);
2547         if (err < 0)
2548                 goto __error;
2549         return err;
2550
2551       __error:
2552         module_put(pcm->card->module);
2553       __error2:
2554         snd_card_file_remove(pcm->card, file);
2555       __error1:
2556         return err;
2557 }
2558
2559 static int snd_pcm_release(struct inode *inode, struct file *file)
2560 {
2561         struct snd_pcm *pcm;
2562         struct snd_pcm_substream *substream;
2563         struct snd_pcm_file *pcm_file;
2564
2565         pcm_file = file->private_data;
2566         substream = pcm_file->substream;
2567         if (snd_BUG_ON(!substream))
2568                 return -ENXIO;
2569         pcm = substream->pcm;
2570         mutex_lock(&pcm->open_mutex);
2571         snd_pcm_release_substream(substream);
2572         kfree(pcm_file);
2573         mutex_unlock(&pcm->open_mutex);
2574         wake_up(&pcm->open_wait);
2575         module_put(pcm->card->module);
2576         snd_card_file_remove(pcm->card, file);
2577         return 0;
2578 }
2579
2580 /* check and update PCM state; return 0 or a negative error
2581  * call this inside PCM lock
2582  */
2583 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2584 {
2585         switch (substream->runtime->status->state) {
2586         case SNDRV_PCM_STATE_DRAINING:
2587                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2588                         return -EBADFD;
2589                 /* Fall through */
2590         case SNDRV_PCM_STATE_RUNNING:
2591                 return snd_pcm_update_hw_ptr(substream);
2592         case SNDRV_PCM_STATE_PREPARED:
2593         case SNDRV_PCM_STATE_PAUSED:
2594                 return 0;
2595         case SNDRV_PCM_STATE_SUSPENDED:
2596                 return -ESTRPIPE;
2597         case SNDRV_PCM_STATE_XRUN:
2598                 return -EPIPE;
2599         default:
2600                 return -EBADFD;
2601         }
2602 }
2603
2604 /* increase the appl_ptr; returns the processed frames or a negative error */
2605 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2606                                           snd_pcm_uframes_t frames,
2607                                            snd_pcm_sframes_t avail)
2608 {
2609         struct snd_pcm_runtime *runtime = substream->runtime;
2610         snd_pcm_sframes_t appl_ptr;
2611         int ret;
2612
2613         if (avail <= 0)
2614                 return 0;
2615         if (frames > (snd_pcm_uframes_t)avail)
2616                 frames = avail;
2617         appl_ptr = runtime->control->appl_ptr + frames;
2618         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2619                 appl_ptr -= runtime->boundary;
2620         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2621         return ret < 0 ? ret : frames;
2622 }
2623
2624 /* decrease the appl_ptr; returns the processed frames or zero for error */
2625 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2626                                          snd_pcm_uframes_t frames,
2627                                          snd_pcm_sframes_t avail)
2628 {
2629         struct snd_pcm_runtime *runtime = substream->runtime;
2630         snd_pcm_sframes_t appl_ptr;
2631         int ret;
2632
2633         if (avail <= 0)
2634                 return 0;
2635         if (frames > (snd_pcm_uframes_t)avail)
2636                 frames = avail;
2637         appl_ptr = runtime->control->appl_ptr - frames;
2638         if (appl_ptr < 0)
2639                 appl_ptr += runtime->boundary;
2640         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2641         /* NOTE: we return zero for errors because PulseAudio gets depressed
2642          * upon receiving an error from rewind ioctl and stops processing
2643          * any longer.  Returning zero means that no rewind is done, so
2644          * it's not absolutely wrong to answer like that.
2645          */
2646         return ret < 0 ? 0 : frames;
2647 }
2648
2649 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2650                                         snd_pcm_uframes_t frames)
2651 {
2652         snd_pcm_sframes_t ret;
2653
2654         if (frames == 0)
2655                 return 0;
2656
2657         snd_pcm_stream_lock_irq(substream);
2658         ret = do_pcm_hwsync(substream);
2659         if (!ret)
2660                 ret = rewind_appl_ptr(substream, frames,
2661                                       snd_pcm_hw_avail(substream));
2662         snd_pcm_stream_unlock_irq(substream);
2663         return ret;
2664 }
2665
2666 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2667                                          snd_pcm_uframes_t frames)
2668 {
2669         snd_pcm_sframes_t ret;
2670
2671         if (frames == 0)
2672                 return 0;
2673
2674         snd_pcm_stream_lock_irq(substream);
2675         ret = do_pcm_hwsync(substream);
2676         if (!ret)
2677                 ret = forward_appl_ptr(substream, frames,
2678                                        snd_pcm_avail(substream));
2679         snd_pcm_stream_unlock_irq(substream);
2680         return ret;
2681 }
2682
2683 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2684 {
2685         int err;
2686
2687         snd_pcm_stream_lock_irq(substream);
2688         err = do_pcm_hwsync(substream);
2689         snd_pcm_stream_unlock_irq(substream);
2690         return err;
2691 }
2692
2693 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2694                          snd_pcm_sframes_t *delay)
2695 {
2696         int err;
2697         snd_pcm_sframes_t n = 0;
2698
2699         snd_pcm_stream_lock_irq(substream);
2700         err = do_pcm_hwsync(substream);
2701         if (!err)
2702                 n = snd_pcm_calc_delay(substream);
2703         snd_pcm_stream_unlock_irq(substream);
2704         if (!err)
2705                 *delay = n;
2706         return err;
2707 }
2708
2709 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2710                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2711 {
2712         struct snd_pcm_runtime *runtime = substream->runtime;
2713         struct snd_pcm_sync_ptr sync_ptr;
2714         volatile struct snd_pcm_mmap_status *status;
2715         volatile struct snd_pcm_mmap_control *control;
2716         int err;
2717
2718         memset(&sync_ptr, 0, sizeof(sync_ptr));
2719         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2720                 return -EFAULT;
2721         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2722                 return -EFAULT;
2723         status = runtime->status;
2724         control = runtime->control;
2725         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2726                 err = snd_pcm_hwsync(substream);
2727                 if (err < 0)
2728                         return err;
2729         }
2730         snd_pcm_stream_lock_irq(substream);
2731         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2732                 err = pcm_lib_apply_appl_ptr(substream,
2733                                              sync_ptr.c.control.appl_ptr);
2734                 if (err < 0) {
2735                         snd_pcm_stream_unlock_irq(substream);
2736                         return err;
2737                 }
2738         } else {
2739                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2740         }
2741         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2742                 control->avail_min = sync_ptr.c.control.avail_min;
2743         else
2744                 sync_ptr.c.control.avail_min = control->avail_min;
2745         sync_ptr.s.status.state = status->state;
2746         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2747         sync_ptr.s.status.tstamp = status->tstamp;
2748         sync_ptr.s.status.suspended_state = status->suspended_state;
2749         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2750         snd_pcm_stream_unlock_irq(substream);
2751         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2752                 return -EFAULT;
2753         return 0;
2754 }
2755
2756 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2757 {
2758         struct snd_pcm_runtime *runtime = substream->runtime;
2759         int arg;
2760
2761         if (get_user(arg, _arg))
2762                 return -EFAULT;
2763         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2764                 return -EINVAL;
2765         runtime->tstamp_type = arg;
2766         return 0;
2767 }
2768
2769 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2770                                       struct snd_xferi __user *_xferi)
2771 {
2772         struct snd_xferi xferi;
2773         struct snd_pcm_runtime *runtime = substream->runtime;
2774         snd_pcm_sframes_t result;
2775
2776         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2777                 return -EBADFD;
2778         if (put_user(0, &_xferi->result))
2779                 return -EFAULT;
2780         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2781                 return -EFAULT;
2782         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2783                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2784         else
2785                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2786         __put_user(result, &_xferi->result);
2787         return result < 0 ? result : 0;
2788 }
2789
2790 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2791                                       struct snd_xfern __user *_xfern)
2792 {
2793         struct snd_xfern xfern;
2794         struct snd_pcm_runtime *runtime = substream->runtime;
2795         void *bufs;
2796         snd_pcm_sframes_t result;
2797
2798         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2799                 return -EBADFD;
2800         if (runtime->channels > 128)
2801                 return -EINVAL;
2802         if (put_user(0, &_xfern->result))
2803                 return -EFAULT;
2804         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2805                 return -EFAULT;
2806
2807         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2808         if (IS_ERR(bufs))
2809                 return PTR_ERR(bufs);
2810         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2811                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2812         else
2813                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2814         kfree(bufs);
2815         __put_user(result, &_xfern->result);
2816         return result < 0 ? result : 0;
2817 }
2818
2819 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2820                                 snd_pcm_uframes_t __user *_frames)
2821 {
2822         snd_pcm_uframes_t frames;
2823         snd_pcm_sframes_t result;
2824
2825         if (get_user(frames, _frames))
2826                 return -EFAULT;
2827         if (put_user(0, _frames))
2828                 return -EFAULT;
2829         result = snd_pcm_rewind(substream, frames);
2830         __put_user(result, _frames);
2831         return result < 0 ? result : 0;
2832 }
2833
2834 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2835                                  snd_pcm_uframes_t __user *_frames)
2836 {
2837         snd_pcm_uframes_t frames;
2838         snd_pcm_sframes_t result;
2839
2840         if (get_user(frames, _frames))
2841                 return -EFAULT;
2842         if (put_user(0, _frames))
2843                 return -EFAULT;
2844         result = snd_pcm_forward(substream, frames);
2845         __put_user(result, _frames);
2846         return result < 0 ? result : 0;
2847 }
2848
2849 static int snd_pcm_common_ioctl(struct file *file,
2850                                  struct snd_pcm_substream *substream,
2851                                  unsigned int cmd, void __user *arg)
2852 {
2853         struct snd_pcm_file *pcm_file = file->private_data;
2854         int res;
2855
2856         if (PCM_RUNTIME_CHECK(substream))
2857                 return -ENXIO;
2858
2859         res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2860         if (res < 0)
2861                 return res;
2862
2863         switch (cmd) {
2864         case SNDRV_PCM_IOCTL_PVERSION:
2865                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2866         case SNDRV_PCM_IOCTL_INFO:
2867                 return snd_pcm_info_user(substream, arg);
2868         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2869                 return 0;
2870         case SNDRV_PCM_IOCTL_TTSTAMP:
2871                 return snd_pcm_tstamp(substream, arg);
2872         case SNDRV_PCM_IOCTL_USER_PVERSION:
2873                 if (get_user(pcm_file->user_pversion,
2874                              (unsigned int __user *)arg))
2875                         return -EFAULT;
2876                 return 0;
2877         case SNDRV_PCM_IOCTL_HW_REFINE:
2878                 return snd_pcm_hw_refine_user(substream, arg);
2879         case SNDRV_PCM_IOCTL_HW_PARAMS:
2880                 return snd_pcm_hw_params_user(substream, arg);
2881         case SNDRV_PCM_IOCTL_HW_FREE:
2882                 return snd_pcm_hw_free(substream);
2883         case SNDRV_PCM_IOCTL_SW_PARAMS:
2884                 return snd_pcm_sw_params_user(substream, arg);
2885         case SNDRV_PCM_IOCTL_STATUS:
2886                 return snd_pcm_status_user(substream, arg, false);
2887         case SNDRV_PCM_IOCTL_STATUS_EXT:
2888                 return snd_pcm_status_user(substream, arg, true);
2889         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2890                 return snd_pcm_channel_info_user(substream, arg);
2891         case SNDRV_PCM_IOCTL_PREPARE:
2892                 return snd_pcm_prepare(substream, file);
2893         case SNDRV_PCM_IOCTL_RESET:
2894                 return snd_pcm_reset(substream);
2895         case SNDRV_PCM_IOCTL_START:
2896                 return snd_pcm_start_lock_irq(substream);
2897         case SNDRV_PCM_IOCTL_LINK:
2898                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2899         case SNDRV_PCM_IOCTL_UNLINK:
2900                 return snd_pcm_unlink(substream);
2901         case SNDRV_PCM_IOCTL_RESUME:
2902                 return snd_pcm_resume(substream);
2903         case SNDRV_PCM_IOCTL_XRUN:
2904                 return snd_pcm_xrun(substream);
2905         case SNDRV_PCM_IOCTL_HWSYNC:
2906                 return snd_pcm_hwsync(substream);
2907         case SNDRV_PCM_IOCTL_DELAY:
2908         {
2909                 snd_pcm_sframes_t delay;
2910                 snd_pcm_sframes_t __user *res = arg;
2911                 int err;
2912
2913                 err = snd_pcm_delay(substream, &delay);
2914                 if (err)
2915                         return err;
2916                 if (put_user(delay, res))
2917                         return -EFAULT;
2918                 return 0;
2919         }
2920         case SNDRV_PCM_IOCTL_SYNC_PTR:
2921                 return snd_pcm_sync_ptr(substream, arg);
2922 #ifdef CONFIG_SND_SUPPORT_OLD_API
2923         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2924                 return snd_pcm_hw_refine_old_user(substream, arg);
2925         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2926                 return snd_pcm_hw_params_old_user(substream, arg);
2927 #endif
2928         case SNDRV_PCM_IOCTL_DRAIN:
2929                 return snd_pcm_drain(substream, file);
2930         case SNDRV_PCM_IOCTL_DROP:
2931                 return snd_pcm_drop(substream);
2932         case SNDRV_PCM_IOCTL_PAUSE:
2933                 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2934                                                substream,
2935                                                (int)(unsigned long)arg);
2936         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2937         case SNDRV_PCM_IOCTL_READI_FRAMES:
2938                 return snd_pcm_xferi_frames_ioctl(substream, arg);
2939         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2940         case SNDRV_PCM_IOCTL_READN_FRAMES:
2941                 return snd_pcm_xfern_frames_ioctl(substream, arg);
2942         case SNDRV_PCM_IOCTL_REWIND:
2943                 return snd_pcm_rewind_ioctl(substream, arg);
2944         case SNDRV_PCM_IOCTL_FORWARD:
2945                 return snd_pcm_forward_ioctl(substream, arg);
2946         }
2947         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2948         return -ENOTTY;
2949 }
2950
2951 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2952                           unsigned long arg)
2953 {
2954         struct snd_pcm_file *pcm_file;
2955
2956         pcm_file = file->private_data;
2957
2958         if (((cmd >> 8) & 0xff) != 'A')
2959                 return -ENOTTY;
2960
2961         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2962                                      (void __user *)arg);
2963 }
2964
2965 /**
2966  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2967  * @substream: PCM substream
2968  * @cmd: IOCTL cmd
2969  * @arg: IOCTL argument
2970  *
2971  * The function is provided primarily for OSS layer and USB gadget drivers,
2972  * and it allows only the limited set of ioctls (hw_params, sw_params,
2973  * prepare, start, drain, drop, forward).
2974  */
2975 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2976                          unsigned int cmd, void *arg)
2977 {
2978         snd_pcm_uframes_t *frames = arg;
2979         snd_pcm_sframes_t result;
2980
2981         switch (cmd) {
2982         case SNDRV_PCM_IOCTL_FORWARD:
2983         {
2984                 /* provided only for OSS; capture-only and no value returned */
2985                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
2986                         return -EINVAL;
2987                 result = snd_pcm_forward(substream, *frames);
2988                 return result < 0 ? result : 0;
2989         }
2990         case SNDRV_PCM_IOCTL_HW_PARAMS:
2991                 return snd_pcm_hw_params(substream, arg);
2992         case SNDRV_PCM_IOCTL_SW_PARAMS:
2993                 return snd_pcm_sw_params(substream, arg);
2994         case SNDRV_PCM_IOCTL_PREPARE:
2995                 return snd_pcm_prepare(substream, NULL);
2996         case SNDRV_PCM_IOCTL_START:
2997                 return snd_pcm_start_lock_irq(substream);
2998         case SNDRV_PCM_IOCTL_DRAIN:
2999                 return snd_pcm_drain(substream, NULL);
3000         case SNDRV_PCM_IOCTL_DROP:
3001                 return snd_pcm_drop(substream);
3002         case SNDRV_PCM_IOCTL_DELAY:
3003                 return snd_pcm_delay(substream, frames);
3004         default:
3005                 return -EINVAL;
3006         }
3007 }
3008 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3009
3010 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3011                             loff_t * offset)
3012 {
3013         struct snd_pcm_file *pcm_file;
3014         struct snd_pcm_substream *substream;
3015         struct snd_pcm_runtime *runtime;
3016         snd_pcm_sframes_t result;
3017
3018         pcm_file = file->private_data;
3019         substream = pcm_file->substream;
3020         if (PCM_RUNTIME_CHECK(substream))
3021                 return -ENXIO;
3022         runtime = substream->runtime;
3023         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3024                 return -EBADFD;
3025         if (!frame_aligned(runtime, count))
3026                 return -EINVAL;
3027         count = bytes_to_frames(runtime, count);
3028         result = snd_pcm_lib_read(substream, buf, count);
3029         if (result > 0)
3030                 result = frames_to_bytes(runtime, result);
3031         return result;
3032 }
3033
3034 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3035                              size_t count, loff_t * offset)
3036 {
3037         struct snd_pcm_file *pcm_file;
3038         struct snd_pcm_substream *substream;
3039         struct snd_pcm_runtime *runtime;
3040         snd_pcm_sframes_t result;
3041
3042         pcm_file = file->private_data;
3043         substream = pcm_file->substream;
3044         if (PCM_RUNTIME_CHECK(substream))
3045                 return -ENXIO;
3046         runtime = substream->runtime;
3047         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3048                 return -EBADFD;
3049         if (!frame_aligned(runtime, count))
3050                 return -EINVAL;
3051         count = bytes_to_frames(runtime, count);
3052         result = snd_pcm_lib_write(substream, buf, count);
3053         if (result > 0)
3054                 result = frames_to_bytes(runtime, result);
3055         return result;
3056 }
3057
3058 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3059 {
3060         struct snd_pcm_file *pcm_file;
3061         struct snd_pcm_substream *substream;
3062         struct snd_pcm_runtime *runtime;
3063         snd_pcm_sframes_t result;
3064         unsigned long i;
3065         void __user **bufs;
3066         snd_pcm_uframes_t frames;
3067
3068         pcm_file = iocb->ki_filp->private_data;
3069         substream = pcm_file->substream;
3070         if (PCM_RUNTIME_CHECK(substream))
3071                 return -ENXIO;
3072         runtime = substream->runtime;
3073         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3074                 return -EBADFD;
3075         if (!iter_is_iovec(to))
3076                 return -EINVAL;
3077         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3078                 return -EINVAL;
3079         if (!frame_aligned(runtime, to->iov->iov_len))
3080                 return -EINVAL;
3081         frames = bytes_to_samples(runtime, to->iov->iov_len);
3082         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3083         if (bufs == NULL)
3084                 return -ENOMEM;
3085         for (i = 0; i < to->nr_segs; ++i)
3086                 bufs[i] = to->iov[i].iov_base;
3087         result = snd_pcm_lib_readv(substream, bufs, frames);
3088         if (result > 0)
3089                 result = frames_to_bytes(runtime, result);
3090         kfree(bufs);
3091         return result;
3092 }
3093
3094 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3095 {
3096         struct snd_pcm_file *pcm_file;
3097         struct snd_pcm_substream *substream;
3098         struct snd_pcm_runtime *runtime;
3099         snd_pcm_sframes_t result;
3100         unsigned long i;
3101         void __user **bufs;
3102         snd_pcm_uframes_t frames;
3103
3104         pcm_file = iocb->ki_filp->private_data;
3105         substream = pcm_file->substream;
3106         if (PCM_RUNTIME_CHECK(substream))
3107                 return -ENXIO;
3108         runtime = substream->runtime;
3109         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3110                 return -EBADFD;
3111         if (!iter_is_iovec(from))
3112                 return -EINVAL;
3113         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3114             !frame_aligned(runtime, from->iov->iov_len))
3115                 return -EINVAL;
3116         frames = bytes_to_samples(runtime, from->iov->iov_len);
3117         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3118         if (bufs == NULL)
3119                 return -ENOMEM;
3120         for (i = 0; i < from->nr_segs; ++i)
3121                 bufs[i] = from->iov[i].iov_base;
3122         result = snd_pcm_lib_writev(substream, bufs, frames);
3123         if (result > 0)
3124                 result = frames_to_bytes(runtime, result);
3125         kfree(bufs);
3126         return result;
3127 }
3128
3129 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3130 {
3131         struct snd_pcm_file *pcm_file;
3132         struct snd_pcm_substream *substream;
3133         struct snd_pcm_runtime *runtime;
3134         __poll_t mask, ok;
3135         snd_pcm_uframes_t avail;
3136
3137         pcm_file = file->private_data;
3138
3139         substream = pcm_file->substream;
3140         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3141                 ok = EPOLLOUT | EPOLLWRNORM;
3142         else
3143                 ok = EPOLLIN | EPOLLRDNORM;
3144         if (PCM_RUNTIME_CHECK(substream))
3145                 return ok | EPOLLERR;
3146
3147         runtime = substream->runtime;
3148         poll_wait(file, &runtime->sleep, wait);
3149
3150         mask = 0;
3151         snd_pcm_stream_lock_irq(substream);
3152         avail = snd_pcm_avail(substream);
3153         switch (runtime->status->state) {
3154         case SNDRV_PCM_STATE_RUNNING:
3155         case SNDRV_PCM_STATE_PREPARED:
3156         case SNDRV_PCM_STATE_PAUSED:
3157                 if (avail >= runtime->control->avail_min)
3158                         mask = ok;
3159                 break;
3160         case SNDRV_PCM_STATE_DRAINING:
3161                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3162                         mask = ok;
3163                         if (!avail)
3164                                 mask |= EPOLLERR;
3165                 }
3166                 break;
3167         default:
3168                 mask = ok | EPOLLERR;
3169                 break;
3170         }
3171         snd_pcm_stream_unlock_irq(substream);
3172         return mask;
3173 }
3174
3175 /*
3176  * mmap support
3177  */
3178
3179 /*
3180  * Only on coherent architectures, we can mmap the status and the control records
3181  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3182  */
3183 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3184 /*
3185  * mmap status record
3186  */
3187 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3188 {
3189         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3190         struct snd_pcm_runtime *runtime;
3191
3192         if (substream == NULL)
3193                 return VM_FAULT_SIGBUS;
3194         runtime = substream->runtime;
3195         vmf->page = virt_to_page(runtime->status);
3196         get_page(vmf->page);
3197         return 0;
3198 }
3199
3200 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3201 {
3202         .fault =        snd_pcm_mmap_status_fault,
3203 };
3204
3205 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3206                                struct vm_area_struct *area)
3207 {
3208         long size;
3209         if (!(area->vm_flags & VM_READ))
3210                 return -EINVAL;
3211         size = area->vm_end - area->vm_start;
3212         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3213                 return -EINVAL;
3214         area->vm_ops = &snd_pcm_vm_ops_status;
3215         area->vm_private_data = substream;
3216         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3217         return 0;
3218 }
3219
3220 /*
3221  * mmap control record
3222  */
3223 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3224 {
3225         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3226         struct snd_pcm_runtime *runtime;
3227
3228         if (substream == NULL)
3229                 return VM_FAULT_SIGBUS;
3230         runtime = substream->runtime;
3231         vmf->page = virt_to_page(runtime->control);
3232         get_page(vmf->page);
3233         return 0;
3234 }
3235
3236 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3237 {
3238         .fault =        snd_pcm_mmap_control_fault,
3239 };
3240
3241 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3242                                 struct vm_area_struct *area)
3243 {
3244         long size;
3245         if (!(area->vm_flags & VM_READ))
3246                 return -EINVAL;
3247         size = area->vm_end - area->vm_start;
3248         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3249                 return -EINVAL;
3250         area->vm_ops = &snd_pcm_vm_ops_control;
3251         area->vm_private_data = substream;
3252         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3253         return 0;
3254 }
3255
3256 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3257 {
3258         if (pcm_file->no_compat_mmap)
3259                 return false;
3260         /* See pcm_control_mmap_allowed() below.
3261          * Since older alsa-lib requires both status and control mmaps to be
3262          * coupled, we have to disable the status mmap for old alsa-lib, too.
3263          */
3264         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3265             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3266                 return false;
3267         return true;
3268 }
3269
3270 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3271 {
3272         if (pcm_file->no_compat_mmap)
3273                 return false;
3274         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3275          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3276          * thus it effectively assures the manual update of appl_ptr.
3277          */
3278         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3279                 return false;
3280         return true;
3281 }
3282
3283 #else /* ! coherent mmap */
3284 /*
3285  * don't support mmap for status and control records.
3286  */
3287 #define pcm_status_mmap_allowed(pcm_file)       false
3288 #define pcm_control_mmap_allowed(pcm_file)      false
3289
3290 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3291                                struct vm_area_struct *area)
3292 {
3293         return -ENXIO;
3294 }
3295 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3296                                 struct vm_area_struct *area)
3297 {
3298         return -ENXIO;
3299 }
3300 #endif /* coherent mmap */
3301
3302 static inline struct page *
3303 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3304 {
3305         void *vaddr = substream->runtime->dma_area + ofs;
3306         return virt_to_page(vaddr);
3307 }
3308
3309 /*
3310  * fault callback for mmapping a RAM page
3311  */
3312 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3313 {
3314         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3315         struct snd_pcm_runtime *runtime;
3316         unsigned long offset;
3317         struct page * page;
3318         size_t dma_bytes;
3319
3320         if (substream == NULL)
3321                 return VM_FAULT_SIGBUS;
3322         runtime = substream->runtime;
3323         offset = vmf->pgoff << PAGE_SHIFT;
3324         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3325         if (offset > dma_bytes - PAGE_SIZE)
3326                 return VM_FAULT_SIGBUS;
3327         if (substream->ops->page)
3328                 page = substream->ops->page(substream, offset);
3329         else
3330                 page = snd_pcm_default_page_ops(substream, offset);
3331         if (!page)
3332                 return VM_FAULT_SIGBUS;
3333         get_page(page);
3334         vmf->page = page;
3335         return 0;
3336 }
3337
3338 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3339         .open =         snd_pcm_mmap_data_open,
3340         .close =        snd_pcm_mmap_data_close,
3341 };
3342
3343 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3344         .open =         snd_pcm_mmap_data_open,
3345         .close =        snd_pcm_mmap_data_close,
3346         .fault =        snd_pcm_mmap_data_fault,
3347 };
3348
3349 /*
3350  * mmap the DMA buffer on RAM
3351  */
3352
3353 /**
3354  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3355  * @substream: PCM substream
3356  * @area: VMA
3357  *
3358  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3359  * this function is invoked implicitly.
3360  */
3361 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3362                              struct vm_area_struct *area)
3363 {
3364         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3365 #ifdef CONFIG_GENERIC_ALLOCATOR
3366         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3367                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3368                 return remap_pfn_range(area, area->vm_start,
3369                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3370                                 area->vm_end - area->vm_start, area->vm_page_prot);
3371         }
3372 #endif /* CONFIG_GENERIC_ALLOCATOR */
3373 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3374         if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3375             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3376                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3377                                          area,
3378                                          substream->runtime->dma_area,
3379                                          substream->runtime->dma_addr,
3380                                          substream->runtime->dma_bytes);
3381 #endif /* CONFIG_X86 */
3382         /* mmap with fault handler */
3383         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3384         return 0;
3385 }
3386 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3387
3388 /*
3389  * mmap the DMA buffer on I/O memory area
3390  */
3391 #if SNDRV_PCM_INFO_MMAP_IOMEM
3392 /**
3393  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3394  * @substream: PCM substream
3395  * @area: VMA
3396  *
3397  * When your hardware uses the iomapped pages as the hardware buffer and
3398  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3399  * is supposed to work only on limited architectures.
3400  */
3401 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3402                            struct vm_area_struct *area)
3403 {
3404         struct snd_pcm_runtime *runtime = substream->runtime;
3405
3406         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3407         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3408 }
3409 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3410 #endif /* SNDRV_PCM_INFO_MMAP */
3411
3412 /*
3413  * mmap DMA buffer
3414  */
3415 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3416                       struct vm_area_struct *area)
3417 {
3418         struct snd_pcm_runtime *runtime;
3419         long size;
3420         unsigned long offset;
3421         size_t dma_bytes;
3422         int err;
3423
3424         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3425                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3426                         return -EINVAL;
3427         } else {
3428                 if (!(area->vm_flags & VM_READ))
3429                         return -EINVAL;
3430         }
3431         runtime = substream->runtime;
3432         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3433                 return -EBADFD;
3434         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3435                 return -ENXIO;
3436         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3437             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3438                 return -EINVAL;
3439         size = area->vm_end - area->vm_start;
3440         offset = area->vm_pgoff << PAGE_SHIFT;
3441         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3442         if ((size_t)size > dma_bytes)
3443                 return -EINVAL;
3444         if (offset > dma_bytes - size)
3445                 return -EINVAL;
3446
3447         area->vm_ops = &snd_pcm_vm_ops_data;
3448         area->vm_private_data = substream;
3449         if (substream->ops->mmap)
3450                 err = substream->ops->mmap(substream, area);
3451         else
3452                 err = snd_pcm_lib_default_mmap(substream, area);
3453         if (!err)
3454                 atomic_inc(&substream->mmap_count);
3455         return err;
3456 }
3457 EXPORT_SYMBOL(snd_pcm_mmap_data);
3458
3459 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3460 {
3461         struct snd_pcm_file * pcm_file;
3462         struct snd_pcm_substream *substream;
3463         unsigned long offset;
3464
3465         pcm_file = file->private_data;
3466         substream = pcm_file->substream;
3467         if (PCM_RUNTIME_CHECK(substream))
3468                 return -ENXIO;
3469
3470         offset = area->vm_pgoff << PAGE_SHIFT;
3471         switch (offset) {
3472         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3473                 if (!pcm_status_mmap_allowed(pcm_file))
3474                         return -ENXIO;
3475                 return snd_pcm_mmap_status(substream, file, area);
3476         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3477                 if (!pcm_control_mmap_allowed(pcm_file))
3478                         return -ENXIO;
3479                 return snd_pcm_mmap_control(substream, file, area);
3480         default:
3481                 return snd_pcm_mmap_data(substream, file, area);
3482         }
3483         return 0;
3484 }
3485
3486 static int snd_pcm_fasync(int fd, struct file * file, int on)
3487 {
3488         struct snd_pcm_file * pcm_file;
3489         struct snd_pcm_substream *substream;
3490         struct snd_pcm_runtime *runtime;
3491
3492         pcm_file = file->private_data;
3493         substream = pcm_file->substream;
3494         if (PCM_RUNTIME_CHECK(substream))
3495                 return -ENXIO;
3496         runtime = substream->runtime;
3497         return fasync_helper(fd, file, on, &runtime->fasync);
3498 }
3499
3500 /*
3501  * ioctl32 compat
3502  */
3503 #ifdef CONFIG_COMPAT
3504 #include "pcm_compat.c"
3505 #else
3506 #define snd_pcm_ioctl_compat    NULL
3507 #endif
3508
3509 /*
3510  *  To be removed helpers to keep binary compatibility
3511  */
3512
3513 #ifdef CONFIG_SND_SUPPORT_OLD_API
3514 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3515 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3516
3517 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3518                                                struct snd_pcm_hw_params_old *oparams)
3519 {
3520         unsigned int i;
3521
3522         memset(params, 0, sizeof(*params));
3523         params->flags = oparams->flags;
3524         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3525                 params->masks[i].bits[0] = oparams->masks[i];
3526         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3527         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3528         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3529         params->info = oparams->info;
3530         params->msbits = oparams->msbits;
3531         params->rate_num = oparams->rate_num;
3532         params->rate_den = oparams->rate_den;
3533         params->fifo_size = oparams->fifo_size;
3534 }
3535
3536 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3537                                              struct snd_pcm_hw_params *params)
3538 {
3539         unsigned int i;
3540
3541         memset(oparams, 0, sizeof(*oparams));
3542         oparams->flags = params->flags;
3543         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3544                 oparams->masks[i] = params->masks[i].bits[0];
3545         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3546         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3547         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3548         oparams->info = params->info;
3549         oparams->msbits = params->msbits;
3550         oparams->rate_num = params->rate_num;
3551         oparams->rate_den = params->rate_den;
3552         oparams->fifo_size = params->fifo_size;
3553 }
3554
3555 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3556                                       struct snd_pcm_hw_params_old __user * _oparams)
3557 {
3558         struct snd_pcm_hw_params *params;
3559         struct snd_pcm_hw_params_old *oparams = NULL;
3560         int err;
3561
3562         params = kmalloc(sizeof(*params), GFP_KERNEL);
3563         if (!params)
3564                 return -ENOMEM;
3565
3566         oparams = memdup_user(_oparams, sizeof(*oparams));
3567         if (IS_ERR(oparams)) {
3568                 err = PTR_ERR(oparams);
3569                 goto out;
3570         }
3571         snd_pcm_hw_convert_from_old_params(params, oparams);
3572         err = snd_pcm_hw_refine(substream, params);
3573         if (err < 0)
3574                 goto out_old;
3575
3576         err = fixup_unreferenced_params(substream, params);
3577         if (err < 0)
3578                 goto out_old;
3579
3580         snd_pcm_hw_convert_to_old_params(oparams, params);
3581         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3582                 err = -EFAULT;
3583 out_old:
3584         kfree(oparams);
3585 out:
3586         kfree(params);
3587         return err;
3588 }
3589
3590 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3591                                       struct snd_pcm_hw_params_old __user * _oparams)
3592 {
3593         struct snd_pcm_hw_params *params;
3594         struct snd_pcm_hw_params_old *oparams = NULL;
3595         int err;
3596
3597         params = kmalloc(sizeof(*params), GFP_KERNEL);
3598         if (!params)
3599                 return -ENOMEM;
3600
3601         oparams = memdup_user(_oparams, sizeof(*oparams));
3602         if (IS_ERR(oparams)) {
3603                 err = PTR_ERR(oparams);
3604                 goto out;
3605         }
3606
3607         snd_pcm_hw_convert_from_old_params(params, oparams);
3608         err = snd_pcm_hw_params(substream, params);
3609         if (err < 0)
3610                 goto out_old;
3611
3612         snd_pcm_hw_convert_to_old_params(oparams, params);
3613         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3614                 err = -EFAULT;
3615 out_old:
3616         kfree(oparams);
3617 out:
3618         kfree(params);
3619         return err;
3620 }
3621 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3622
3623 #ifndef CONFIG_MMU
3624 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3625                                                unsigned long addr,
3626                                                unsigned long len,
3627                                                unsigned long pgoff,
3628                                                unsigned long flags)
3629 {
3630         struct snd_pcm_file *pcm_file = file->private_data;
3631         struct snd_pcm_substream *substream = pcm_file->substream;
3632         struct snd_pcm_runtime *runtime = substream->runtime;
3633         unsigned long offset = pgoff << PAGE_SHIFT;
3634
3635         switch (offset) {
3636         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3637                 return (unsigned long)runtime->status;
3638         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3639                 return (unsigned long)runtime->control;
3640         default:
3641                 return (unsigned long)runtime->dma_area + offset;
3642         }
3643 }
3644 #else
3645 # define snd_pcm_get_unmapped_area NULL
3646 #endif
3647
3648 /*
3649  *  Register section
3650  */
3651
3652 const struct file_operations snd_pcm_f_ops[2] = {
3653         {
3654                 .owner =                THIS_MODULE,
3655                 .write =                snd_pcm_write,
3656                 .write_iter =           snd_pcm_writev,
3657                 .open =                 snd_pcm_playback_open,
3658                 .release =              snd_pcm_release,
3659                 .llseek =               no_llseek,
3660                 .poll =                 snd_pcm_poll,
3661                 .unlocked_ioctl =       snd_pcm_ioctl,
3662                 .compat_ioctl =         snd_pcm_ioctl_compat,
3663                 .mmap =                 snd_pcm_mmap,
3664                 .fasync =               snd_pcm_fasync,
3665                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3666         },
3667         {
3668                 .owner =                THIS_MODULE,
3669                 .read =                 snd_pcm_read,
3670                 .read_iter =            snd_pcm_readv,
3671                 .open =                 snd_pcm_capture_open,
3672                 .release =              snd_pcm_release,
3673                 .llseek =               no_llseek,
3674                 .poll =                 snd_pcm_poll,
3675                 .unlocked_ioctl =       snd_pcm_ioctl,
3676                 .compat_ioctl =         snd_pcm_ioctl_compat,
3677                 .mmap =                 snd_pcm_mmap,
3678                 .fasync =               snd_pcm_fasync,
3679                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3680         }
3681 };