sound/core/pcm_native.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Digital Audio (PCM) abstract layer
   4  *  Copyright (c) by Jaroslav Kysela <[email protected]>
   5  */
   6
   7 #include <linux/compat.h>
   8 #include <linux/mm.h>
   9 #include <linux/module.h>
  10 #include <linux/file.h>
  11 #include <linux/slab.h>
  12 #include <linux/sched/signal.h>
  13 #include <linux/time.h>
  14 #include <linux/pm_qos.h>
  15 #include <linux/io.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/vmalloc.h>
  18 #include <sound/core.h>
  19 #include <sound/control.h>
  20 #include <sound/info.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/timer.h>
  24 #include <sound/minors.h>
  25 #include <linux/uio.h>
  26 #include <linux/delay.h>
  27
  28 #include "pcm_local.h"
  29
  30 #ifdef CONFIG_SND_DEBUG
  31 #define CREATE_TRACE_POINTS
  32 #include "pcm_param_trace.h"
  33 #else
  34 #define trace_hw_mask_param_enabled()           0
  35 #define trace_hw_interval_param_enabled()       0
  36 #define trace_hw_mask_param(substream, type, index, prev, curr)
  37 #define trace_hw_interval_param(substream, type, index, prev, curr)
  38 #endif
  39
  40 /*
  41  *  Compatibility
  42  */
  43
  44 struct snd_pcm_hw_params_old {
  45         unsigned int flags;
  46         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  47                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  48         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  49                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  50         unsigned int rmask;
  51         unsigned int cmask;
  52         unsigned int info;
  53         unsigned int msbits;
  54         unsigned int rate_num;
  55         unsigned int rate_den;
  56         snd_pcm_uframes_t fifo_size;
  57         unsigned char reserved[64];
  58 };
  59
  60 #ifdef CONFIG_SND_SUPPORT_OLD_API
  61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  63
  64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 #endif
  69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  70
  71 /*
  72  *
  73  */
  74
  75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  76
  77 void snd_pcm_group_init(struct snd_pcm_group *group)
  78 {
  79         spin_lock_init(&group->lock);
  80         mutex_init(&group->mutex);
  81         INIT_LIST_HEAD(&group->substreams);
  82         refcount_set(&group->refs, 1);
  83 }
  84
  85 /* define group lock helpers */
  86 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
  87 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
  88 { \
  89         if (nonatomic) \
  90                 mutex_ ## mutex_action(&group->mutex); \
  91         else \
  92                 spin_ ## action(&group->lock); \
  93 }
  94
  95 DEFINE_PCM_GROUP_LOCK(lock, lock);
  96 DEFINE_PCM_GROUP_LOCK(unlock, unlock);
  97 DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
  98 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
  99
 100 /**
 101  * snd_pcm_stream_lock - Lock the PCM stream
 102  * @substream: PCM substream
 103  *
 104  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 105  * flag of the given substream.  This also takes the global link rw lock
 106  * (or rw sem), too, for avoiding the race with linked streams.
 107  */
 108 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 109 {
 110         snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
 111 }
 112 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
 113
 114 /**
 115  * snd_pcm_stream_unlock - Unlock the PCM stream
 116  * @substream: PCM substream
 117  *
 118  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
 119  */
 120 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 121 {
 122         snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
 123 }
 124 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
 125
 126 /**
 127  * snd_pcm_stream_lock_irq - Lock the PCM stream
 128  * @substream: PCM substream
 129  *
 130  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
 131  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 132  * as snd_pcm_stream_lock().
 133  */
 134 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 135 {
 136         snd_pcm_group_lock_irq(&substream->self_group,
 137                                substream->pcm->nonatomic);
 138 }
 139 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
 140
 141 static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
 142 {
 143         struct snd_pcm_group *group = &substream->self_group;
 144
 145         if (substream->pcm->nonatomic)
 146                 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
 147         else
 148                 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
 149 }
 150
 151 /**
 152  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 153  * @substream: PCM substream
 154  *
 155  * This is a counter-part of snd_pcm_stream_lock_irq().
 156  */
 157 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 158 {
 159         snd_pcm_group_unlock_irq(&substream->self_group,
 160                                  substream->pcm->nonatomic);
 161 }
 162 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
 163
 164 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
 165 {
 166         unsigned long flags = 0;
 167         if (substream->pcm->nonatomic)
 168                 mutex_lock(&substream->self_group.mutex);
 169         else
 170                 spin_lock_irqsave(&substream->self_group.lock, flags);
 171         return flags;
 172 }
 173 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
 174
 175 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
 176 {
 177         unsigned long flags = 0;
 178         if (substream->pcm->nonatomic)
 179                 mutex_lock_nested(&substream->self_group.mutex,
 180                                   SINGLE_DEPTH_NESTING);
 181         else
 182                 spin_lock_irqsave_nested(&substream->self_group.lock, flags,
 183                                          SINGLE_DEPTH_NESTING);
 184         return flags;
 185 }
 186 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
 187
 188 /**
 189  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
 190  * @substream: PCM substream
 191  * @flags: irq flags
 192  *
 193  * This is a counter-part of snd_pcm_stream_lock_irqsave().
 194  */
 195 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 196                                       unsigned long flags)
 197 {
 198         if (substream->pcm->nonatomic)
 199                 mutex_unlock(&substream->self_group.mutex);
 200         else
 201                 spin_unlock_irqrestore(&substream->self_group.lock, flags);
 202 }
 203 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
 204
 205 /* Run PCM ioctl ops */
 206 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
 207                              unsigned cmd, void *arg)
 208 {
 209         if (substream->ops->ioctl)
 210                 return substream->ops->ioctl(substream, cmd, arg);
 211         else
 212                 return snd_pcm_lib_ioctl(substream, cmd, arg);
 213 }
 214
 215 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
 216 {
 217         struct snd_pcm *pcm = substream->pcm;
 218         struct snd_pcm_str *pstr = substream->pstr;
 219
 220         memset(info, 0, sizeof(*info));
 221         info->card = pcm->card->number;
 222         info->device = pcm->device;
 223         info->stream = substream->stream;
 224         info->subdevice = substream->number;
 225         strscpy(info->id, pcm->id, sizeof(info->id));
 226         strscpy(info->name, pcm->name, sizeof(info->name));
 227         info->dev_class = pcm->dev_class;
 228         info->dev_subclass = pcm->dev_subclass;
 229         info->subdevices_count = pstr->substream_count;
 230         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 231         strscpy(info->subname, substream->name, sizeof(info->subname));
 232
 233         return 0;
 234 }
 235
 236 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 237                       struct snd_pcm_info __user * _info)
 238 {
 239         struct snd_pcm_info *info;
 240         int err;
 241
 242         info = kmalloc(sizeof(*info), GFP_KERNEL);
 243         if (! info)
 244                 return -ENOMEM;
 245         err = snd_pcm_info(substream, info);
 246         if (err >= 0) {
 247                 if (copy_to_user(_info, info, sizeof(*info)))
 248                         err = -EFAULT;
 249         }
 250         kfree(info);
 251         return err;
 252 }
 253
 254 /* macro for simplified cast */
 255 #define PARAM_MASK_BIT(b)       (1U << (__force int)(b))
 256
 257 static bool hw_support_mmap(struct snd_pcm_substream *substream)
 258 {
 259         struct snd_dma_buffer *dmabuf;
 260
 261         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 262                 return false;
 263
 264         if (substream->ops->mmap || substream->ops->page)
 265                 return true;
 266
 267         dmabuf = snd_pcm_get_dma_buf(substream);
 268         if (!dmabuf)
 269                 dmabuf = &substream->dma_buffer;
 270         switch (dmabuf->dev.type) {
 271         case SNDRV_DMA_TYPE_UNKNOWN:
 272                 /* we can't know the device, so just assume that the driver does
 273                  * everything right
 274                  */
 275                 return true;
 276         case SNDRV_DMA_TYPE_CONTINUOUS:
 277         case SNDRV_DMA_TYPE_VMALLOC:
 278                 return true;
 279         default:
 280                 return dma_can_mmap(dmabuf->dev.dev);
 281         }
 282 }
 283
 284 static int constrain_mask_params(struct snd_pcm_substream *substream,
 285                                  struct snd_pcm_hw_params *params)
 286 {
 287         struct snd_pcm_hw_constraints *constrs =
 288                                         &substream->runtime->hw_constraints;
 289         struct snd_mask *m;
 290         unsigned int k;
 291         struct snd_mask old_mask __maybe_unused;
 292         int changed;
 293
 294         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 295                 m = hw_param_mask(params, k);
 296                 if (snd_mask_empty(m))
 297                         return -EINVAL;
 298
 299                 /* This parameter is not requested to change by a caller. */
 300                 if (!(params->rmask & PARAM_MASK_BIT(k)))
 301                         continue;
 302
 303                 if (trace_hw_mask_param_enabled())
 304                         old_mask = *m;
 305
 306                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 307                 if (changed < 0)
 308                         return changed;
 309                 if (changed == 0)
 310                         continue;
 311
 312                 /* Set corresponding flag so that the caller gets it. */
 313                 trace_hw_mask_param(substream, k, 0, &old_mask, m);
 314                 params->cmask |= PARAM_MASK_BIT(k);
 315         }
 316
 317         return 0;
 318 }
 319
 320 static int constrain_interval_params(struct snd_pcm_substream *substream,
 321                                      struct snd_pcm_hw_params *params)
 322 {
 323         struct snd_pcm_hw_constraints *constrs =
 324                                         &substream->runtime->hw_constraints;
 325         struct snd_interval *i;
 326         unsigned int k;
 327         struct snd_interval old_interval __maybe_unused;
 328         int changed;
 329
 330         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 331                 i = hw_param_interval(params, k);
 332                 if (snd_interval_empty(i))
 333                         return -EINVAL;
 334
 335                 /* This parameter is not requested to change by a caller. */
 336                 if (!(params->rmask & PARAM_MASK_BIT(k)))
 337                         continue;
 338
 339                 if (trace_hw_interval_param_enabled())
 340                         old_interval = *i;
 341
 342                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 343                 if (changed < 0)
 344                         return changed;
 345                 if (changed == 0)
 346                         continue;
 347
 348                 /* Set corresponding flag so that the caller gets it. */
 349                 trace_hw_interval_param(substream, k, 0, &old_interval, i);
 350                 params->cmask |= PARAM_MASK_BIT(k);
 351         }
 352
 353         return 0;
 354 }
 355
 356 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
 357                                      struct snd_pcm_hw_params *params)
 358 {
 359         struct snd_pcm_hw_constraints *constrs =
 360                                         &substream->runtime->hw_constraints;
 361         unsigned int k;
 362         unsigned int *rstamps;
 363         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 364         unsigned int stamp;
 365         struct snd_pcm_hw_rule *r;
 366         unsigned int d;
 367         struct snd_mask old_mask __maybe_unused;
 368         struct snd_interval old_interval __maybe_unused;
 369         bool again;
 370         int changed, err = 0;
 371
 372         /*
 373          * Each application of rule has own sequence number.
 374          *
 375          * Each member of 'rstamps' array represents the sequence number of
 376          * recent application of corresponding rule.
 377          */
 378         rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
 379         if (!rstamps)
 380                 return -ENOMEM;
 381
 382         /*
 383          * Each member of 'vstamps' array represents the sequence number of
 384          * recent application of rule in which corresponding parameters were
 385          * changed.
 386          *
 387          * In initial state, elements corresponding to parameters requested by
 388          * a caller is 1. For unrequested parameters, corresponding members
 389          * have 0 so that the parameters are never changed anymore.
 390          */
 391         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 392                 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
 393
 394         /* Due to the above design, actual sequence number starts at 2. */
 395         stamp = 2;
 396 retry:
 397         /* Apply all rules in order. */
 398         again = false;
 399         for (k = 0; k < constrs->rules_num; k++) {
 400                 r = &constrs->rules[k];
 401
 402                 /*
 403                  * Check condition bits of this rule. When the rule has
 404                  * some condition bits, parameter without the bits is
 405                  * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
 406                  * is an example of the condition bits.
 407                  */
 408                 if (r->cond && !(r->cond & params->flags))
 409                         continue;
 410
 411                 /*
 412                  * The 'deps' array includes maximum four dependencies
 413                  * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
 414                  * member of this array is a sentinel and should be
 415                  * negative value.
 416                  *
 417                  * This rule should be processed in this time when dependent
 418                  * parameters were changed at former applications of the other
 419                  * rules.
 420                  */
 421                 for (d = 0; r->deps[d] >= 0; d++) {
 422                         if (vstamps[r->deps[d]] > rstamps[k])
 423                                 break;
 424                 }
 425                 if (r->deps[d] < 0)
 426                         continue;
 427
 428                 if (trace_hw_mask_param_enabled()) {
 429                         if (hw_is_mask(r->var))
 430                                 old_mask = *hw_param_mask(params, r->var);
 431                 }
 432                 if (trace_hw_interval_param_enabled()) {
 433                         if (hw_is_interval(r->var))
 434                                 old_interval = *hw_param_interval(params, r->var);
 435                 }
 436
 437                 changed = r->func(params, r);
 438                 if (changed < 0) {
 439                         err = changed;
 440                         goto out;
 441                 }
 442
 443                 /*
 444                  * When the parameter is changed, notify it to the caller
 445                  * by corresponding returned bit, then preparing for next
 446                  * iteration.
 447                  */
 448                 if (changed && r->var >= 0) {
 449                         if (hw_is_mask(r->var)) {
 450                                 trace_hw_mask_param(substream, r->var,
 451                                         k + 1, &old_mask,
 452                                         hw_param_mask(params, r->var));
 453                         }
 454                         if (hw_is_interval(r->var)) {
 455                                 trace_hw_interval_param(substream, r->var,
 456                                         k + 1, &old_interval,
 457                                         hw_param_interval(params, r->var));
 458                         }
 459
 460                         params->cmask |= PARAM_MASK_BIT(r->var);
 461                         vstamps[r->var] = stamp;
 462                         again = true;
 463                 }
 464
 465                 rstamps[k] = stamp++;
 466         }
 467
 468         /* Iterate to evaluate all rules till no parameters are changed. */
 469         if (again)
 470                 goto retry;
 471
 472  out:
 473         kfree(rstamps);
 474         return err;
 475 }
 476
 477 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
 478                                      struct snd_pcm_hw_params *params)
 479 {
 480         const struct snd_interval *i;
 481         const struct snd_mask *m;
 482         struct snd_mask *m_rw;
 483         int err;
 484
 485         if (!params->msbits) {
 486                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 487                 if (snd_interval_single(i))
 488                         params->msbits = snd_interval_value(i);
 489                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 490                 if (snd_mask_single(m)) {
 491                         snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
 492                         params->msbits = snd_pcm_format_width(format);
 493                 }
 494         }
 495
 496         if (params->msbits) {
 497                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 498                 if (snd_mask_single(m)) {
 499                         snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
 500
 501                         if (snd_pcm_format_linear(format) &&
 502                             snd_pcm_format_width(format) != params->msbits) {
 503                                 m_rw = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
 504                                 snd_mask_reset(m_rw,
 505                                                (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
 506                                 if (snd_mask_empty(m_rw))
 507                                         return -EINVAL;
 508                         }
 509                 }
 510         }
 511
 512         if (!params->rate_den) {
 513                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 514                 if (snd_interval_single(i)) {
 515                         params->rate_num = snd_interval_value(i);
 516                         params->rate_den = 1;
 517                 }
 518         }
 519
 520         if (!params->fifo_size) {
 521                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 522                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 523                 if (snd_mask_single(m) && snd_interval_single(i)) {
 524                         err = snd_pcm_ops_ioctl(substream,
 525                                                 SNDRV_PCM_IOCTL1_FIFO_SIZE,
 526                                                 params);
 527                         if (err < 0)
 528                                 return err;
 529                 }
 530         }
 531
 532         if (!params->info) {
 533                 params->info = substream->runtime->hw.info;
 534                 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
 535                                   SNDRV_PCM_INFO_DRAIN_TRIGGER);
 536                 if (!hw_support_mmap(substream))
 537                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
 538                                           SNDRV_PCM_INFO_MMAP_VALID);
 539         }
 540
 541         return 0;
 542 }
 543
 544 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 545                       struct snd_pcm_hw_params *params)
 546 {
 547         int err;
 548
 549         params->info = 0;
 550         params->fifo_size = 0;
 551         if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 552                 params->msbits = 0;
 553         if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
 554                 params->rate_num = 0;
 555                 params->rate_den = 0;
 556         }
 557
 558         err = constrain_mask_params(substream, params);
 559         if (err < 0)
 560                 return err;
 561
 562         err = constrain_interval_params(substream, params);
 563         if (err < 0)
 564                 return err;
 565
 566         err = constrain_params_by_rules(substream, params);
 567         if (err < 0)
 568                 return err;
 569
 570         params->rmask = 0;
 571
 572         return 0;
 573 }
 574 EXPORT_SYMBOL(snd_pcm_hw_refine);
 575
 576 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 577                                   struct snd_pcm_hw_params __user * _params)
 578 {
 579         struct snd_pcm_hw_params *params;
 580         int err;
 581
 582         params = memdup_user(_params, sizeof(*params));
 583         if (IS_ERR(params))
 584                 return PTR_ERR(params);
 585
 586         err = snd_pcm_hw_refine(substream, params);
 587         if (err < 0)
 588                 goto end;
 589
 590         err = fixup_unreferenced_params(substream, params);
 591         if (err < 0)
 592                 goto end;
 593
 594         if (copy_to_user(_params, params, sizeof(*params)))
 595                 err = -EFAULT;
 596 end:
 597         kfree(params);
 598         return err;
 599 }
 600
 601 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 602 {
 603         int usecs;
 604
 605         if (! runtime->rate)
 606                 return -1; /* invalid */
 607
 608         /* take 75% of period time as the deadline */
 609         usecs = (750000 / runtime->rate) * runtime->period_size;
 610         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 611                 runtime->rate;
 612
 613         return usecs;
 614 }
 615
 616 static void snd_pcm_set_state(struct snd_pcm_substream *substream,
 617                               snd_pcm_state_t state)
 618 {
 619         snd_pcm_stream_lock_irq(substream);
 620         if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
 621                 __snd_pcm_set_state(substream->runtime, state);
 622         snd_pcm_stream_unlock_irq(substream);
 623 }
 624
 625 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
 626                                         int event)
 627 {
 628 #ifdef CONFIG_SND_PCM_TIMER
 629         if (substream->timer)
 630                 snd_timer_notify(substream->timer, event,
 631                                         &substream->runtime->trigger_tstamp);
 632 #endif
 633 }
 634
 635 void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
 636 {
 637         if (substream->runtime && substream->runtime->stop_operating) {
 638                 substream->runtime->stop_operating = false;
 639                 if (substream->ops && substream->ops->sync_stop)
 640                         substream->ops->sync_stop(substream);
 641                 else if (sync_irq && substream->pcm->card->sync_irq > 0)
 642                         synchronize_irq(substream->pcm->card->sync_irq);
 643         }
 644 }
 645
 646 /**
 647  * snd_pcm_hw_params_choose - choose a configuration defined by @params
 648  * @pcm: PCM instance
 649  * @params: the hw_params instance
 650  *
 651  * Choose one configuration from configuration space defined by @params.
 652  * The configuration chosen is that obtained fixing in this order:
 653  * first access, first format, first subformat, min channels,
 654  * min rate, min period time, max buffer size, min tick time
 655  *
 656  * Return: Zero if successful, or a negative error code on failure.
 657  */
 658 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
 659                                     struct snd_pcm_hw_params *params)
 660 {
 661         static const int vars[] = {
 662                 SNDRV_PCM_HW_PARAM_ACCESS,
 663                 SNDRV_PCM_HW_PARAM_FORMAT,
 664                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
 665                 SNDRV_PCM_HW_PARAM_CHANNELS,
 666                 SNDRV_PCM_HW_PARAM_RATE,
 667                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 668                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 669                 SNDRV_PCM_HW_PARAM_TICK_TIME,
 670                 -1
 671         };
 672         const int *v;
 673         struct snd_mask old_mask __maybe_unused;
 674         struct snd_interval old_interval __maybe_unused;
 675         int changed;
 676
 677         for (v = vars; *v != -1; v++) {
 678                 /* Keep old parameter to trace. */
 679                 if (trace_hw_mask_param_enabled()) {
 680                         if (hw_is_mask(*v))
 681                                 old_mask = *hw_param_mask(params, *v);
 682                 }
 683                 if (trace_hw_interval_param_enabled()) {
 684                         if (hw_is_interval(*v))
 685                                 old_interval = *hw_param_interval(params, *v);
 686                 }
 687                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
 688                         changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
 689                 else
 690                         changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
 691                 if (changed < 0)
 692                         return changed;
 693                 if (changed == 0)
 694                         continue;
 695
 696                 /* Trace the changed parameter. */
 697                 if (hw_is_mask(*v)) {
 698                         trace_hw_mask_param(pcm, *v, 0, &old_mask,
 699                                             hw_param_mask(params, *v));
 700                 }
 701                 if (hw_is_interval(*v)) {
 702                         trace_hw_interval_param(pcm, *v, 0, &old_interval,
 703                                                 hw_param_interval(params, *v));
 704                 }
 705         }
 706
 707         return 0;
 708 }
 709
 710 /* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
 711  * block the further r/w operations
 712  */
 713 static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
 714 {
 715         if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
 716                 return -EBUSY;
 717         mutex_lock(&runtime->buffer_mutex);
 718         return 0; /* keep buffer_mutex, unlocked by below */
 719 }
 720
 721 /* release buffer_mutex and clear r/w access flag */
 722 static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
 723 {
 724         mutex_unlock(&runtime->buffer_mutex);
 725         atomic_inc(&runtime->buffer_accessing);
 726 }
 727
 728 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 729 #define is_oss_stream(substream)        ((substream)->oss.oss)
 730 #else
 731 #define is_oss_stream(substream)        false
 732 #endif
 733
 734 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 735                              struct snd_pcm_hw_params *params)
 736 {
 737         struct snd_pcm_runtime *runtime;
 738         int err, usecs;
 739         unsigned int bits;
 740         snd_pcm_uframes_t frames;
 741
 742         if (PCM_RUNTIME_CHECK(substream))
 743                 return -ENXIO;
 744         runtime = substream->runtime;
 745         err = snd_pcm_buffer_access_lock(runtime);
 746         if (err < 0)
 747                 return err;
 748         snd_pcm_stream_lock_irq(substream);
 749         switch (runtime->state) {
 750         case SNDRV_PCM_STATE_OPEN:
 751         case SNDRV_PCM_STATE_SETUP:
 752         case SNDRV_PCM_STATE_PREPARED:
 753                 if (!is_oss_stream(substream) &&
 754                     atomic_read(&substream->mmap_count))
 755                         err = -EBADFD;
 756                 break;
 757         default:
 758                 err = -EBADFD;
 759                 break;
 760         }
 761         snd_pcm_stream_unlock_irq(substream);
 762         if (err)
 763                 goto unlock;
 764
 765         snd_pcm_sync_stop(substream, true);
 766
 767         params->rmask = ~0U;
 768         err = snd_pcm_hw_refine(substream, params);
 769         if (err < 0)
 770                 goto _error;
 771
 772         err = snd_pcm_hw_params_choose(substream, params);
 773         if (err < 0)
 774                 goto _error;
 775
 776         err = fixup_unreferenced_params(substream, params);
 777         if (err < 0)
 778                 goto _error;
 779
 780         if (substream->managed_buffer_alloc) {
 781                 err = snd_pcm_lib_malloc_pages(substream,
 782                                                params_buffer_bytes(params));
 783                 if (err < 0)
 784                         goto _error;
 785                 runtime->buffer_changed = err > 0;
 786         }
 787
 788         if (substream->ops->hw_params != NULL) {
 789                 err = substream->ops->hw_params(substream, params);
 790                 if (err < 0)
 791                         goto _error;
 792         }
 793
 794         runtime->access = params_access(params);
 795         runtime->format = params_format(params);
 796         runtime->subformat = params_subformat(params);
 797         runtime->channels = params_channels(params);
 798         runtime->rate = params_rate(params);
 799         runtime->period_size = params_period_size(params);
 800         runtime->periods = params_periods(params);
 801         runtime->buffer_size = params_buffer_size(params);
 802         runtime->info = params->info;
 803         runtime->rate_num = params->rate_num;
 804         runtime->rate_den = params->rate_den;
 805         runtime->no_period_wakeup =
 806                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 807                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 808
 809         bits = snd_pcm_format_physical_width(runtime->format);
 810         runtime->sample_bits = bits;
 811         bits *= runtime->channels;
 812         runtime->frame_bits = bits;
 813         frames = 1;
 814         while (bits % 8 != 0) {
 815                 bits *= 2;
 816                 frames *= 2;
 817         }
 818         runtime->byte_align = bits / 8;
 819         runtime->min_align = frames;
 820
 821         /* Default sw params */
 822         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 823         runtime->period_step = 1;
 824         runtime->control->avail_min = runtime->period_size;
 825         runtime->start_threshold = 1;
 826         runtime->stop_threshold = runtime->buffer_size;
 827         runtime->silence_threshold = 0;
 828         runtime->silence_size = 0;
 829         runtime->boundary = runtime->buffer_size;
 830         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 831                 runtime->boundary *= 2;
 832
 833         /* clear the buffer for avoiding possible kernel info leaks */
 834         if (runtime->dma_area && !substream->ops->copy) {
 835                 size_t size = runtime->dma_bytes;
 836
 837                 if (runtime->info & SNDRV_PCM_INFO_MMAP)
 838                         size = PAGE_ALIGN(size);
 839                 memset(runtime->dma_area, 0, size);
 840         }
 841
 842         snd_pcm_timer_resolution_change(substream);
 843         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 844
 845         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
 846                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
 847         usecs = period_to_usecs(runtime);
 848         if (usecs >= 0)
 849                 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
 850                                             usecs);
 851         err = 0;
 852  _error:
 853         if (err) {
 854                 /* hardware might be unusable from this time,
 855                  * so we force application to retry to set
 856                  * the correct hardware parameter settings
 857                  */
 858                 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 859                 if (substream->ops->hw_free != NULL)
 860                         substream->ops->hw_free(substream);
 861                 if (substream->managed_buffer_alloc)
 862                         snd_pcm_lib_free_pages(substream);
 863         }
 864  unlock:
 865         snd_pcm_buffer_access_unlock(runtime);
 866         return err;
 867 }
 868
 869 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 870                                   struct snd_pcm_hw_params __user * _params)
 871 {
 872         struct snd_pcm_hw_params *params;
 873         int err;
 874
 875         params = memdup_user(_params, sizeof(*params));
 876         if (IS_ERR(params))
 877                 return PTR_ERR(params);
 878
 879         err = snd_pcm_hw_params(substream, params);
 880         if (err < 0)
 881                 goto end;
 882
 883         if (copy_to_user(_params, params, sizeof(*params)))
 884                 err = -EFAULT;
 885 end:
 886         kfree(params);
 887         return err;
 888 }
 889
 890 static int do_hw_free(struct snd_pcm_substream *substream)
 891 {
 892         int result = 0;
 893
 894         snd_pcm_sync_stop(substream, true);
 895         if (substream->ops->hw_free)
 896                 result = substream->ops->hw_free(substream);
 897         if (substream->managed_buffer_alloc)
 898                 snd_pcm_lib_free_pages(substream);
 899         return result;
 900 }
 901
 902 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 903 {
 904         struct snd_pcm_runtime *runtime;
 905         int result = 0;
 906
 907         if (PCM_RUNTIME_CHECK(substream))
 908                 return -ENXIO;
 909         runtime = substream->runtime;
 910         result = snd_pcm_buffer_access_lock(runtime);
 911         if (result < 0)
 912                 return result;
 913         snd_pcm_stream_lock_irq(substream);
 914         switch (runtime->state) {
 915         case SNDRV_PCM_STATE_SETUP:
 916         case SNDRV_PCM_STATE_PREPARED:
 917                 if (atomic_read(&substream->mmap_count))
 918                         result = -EBADFD;
 919                 break;
 920         default:
 921                 result = -EBADFD;
 922                 break;
 923         }
 924         snd_pcm_stream_unlock_irq(substream);
 925         if (result)
 926                 goto unlock;
 927         result = do_hw_free(substream);
 928         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 929         cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
 930  unlock:
 931         snd_pcm_buffer_access_unlock(runtime);
 932         return result;
 933 }
 934
 935 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 936                              struct snd_pcm_sw_params *params)
 937 {
 938         struct snd_pcm_runtime *runtime;
 939         int err;
 940
 941         if (PCM_RUNTIME_CHECK(substream))
 942                 return -ENXIO;
 943         runtime = substream->runtime;
 944         snd_pcm_stream_lock_irq(substream);
 945         if (runtime->state == SNDRV_PCM_STATE_OPEN) {
 946                 snd_pcm_stream_unlock_irq(substream);
 947                 return -EBADFD;
 948         }
 949         snd_pcm_stream_unlock_irq(substream);
 950
 951         if (params->tstamp_mode < 0 ||
 952             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 953                 return -EINVAL;
 954         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 955             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 956                 return -EINVAL;
 957         if (params->avail_min == 0)
 958                 return -EINVAL;
 959         if (params->silence_size >= runtime->boundary) {
 960                 if (params->silence_threshold != 0)
 961                         return -EINVAL;
 962         } else {
 963                 if (params->silence_size > params->silence_threshold)
 964                         return -EINVAL;
 965                 if (params->silence_threshold > runtime->buffer_size)
 966                         return -EINVAL;
 967         }
 968         err = 0;
 969         snd_pcm_stream_lock_irq(substream);
 970         runtime->tstamp_mode = params->tstamp_mode;
 971         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 972                 runtime->tstamp_type = params->tstamp_type;
 973         runtime->period_step = params->period_step;
 974         runtime->control->avail_min = params->avail_min;
 975         runtime->start_threshold = params->start_threshold;
 976         runtime->stop_threshold = params->stop_threshold;
 977         runtime->silence_threshold = params->silence_threshold;
 978         runtime->silence_size = params->silence_size;
 979         params->boundary = runtime->boundary;
 980         if (snd_pcm_running(substream)) {
 981                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 982                     runtime->silence_size > 0)
 983                         snd_pcm_playback_silence(substream, ULONG_MAX);
 984                 err = snd_pcm_update_state(substream, runtime);
 985         }
 986         snd_pcm_stream_unlock_irq(substream);
 987         return err;
 988 }
 989
 990 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 991                                   struct snd_pcm_sw_params __user * _params)
 992 {
 993         struct snd_pcm_sw_params params;
 994         int err;
 995         if (copy_from_user(&params, _params, sizeof(params)))
 996                 return -EFAULT;
 997         err = snd_pcm_sw_params(substream, &params);
 998         if (copy_to_user(_params, &params, sizeof(params)))
 999                 return -EFAULT;
1000         return err;
1001 }
1002
1003 static inline snd_pcm_uframes_t
1004 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
1005 {
1006         snd_pcm_uframes_t delay;
1007
1008         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1009                 delay = snd_pcm_playback_hw_avail(substream->runtime);
1010         else
1011                 delay = snd_pcm_capture_avail(substream->runtime);
1012         return delay + substream->runtime->delay;
1013 }
1014
1015 int snd_pcm_status64(struct snd_pcm_substream *substream,
1016                      struct snd_pcm_status64 *status)
1017 {
1018         struct snd_pcm_runtime *runtime = substream->runtime;
1019
1020         snd_pcm_stream_lock_irq(substream);
1021
1022         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1023                                         &runtime->audio_tstamp_config);
1024
1025         /* backwards compatible behavior */
1026         if (runtime->audio_tstamp_config.type_requested ==
1027                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1028                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1029                         runtime->audio_tstamp_config.type_requested =
1030                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1031                 else
1032                         runtime->audio_tstamp_config.type_requested =
1033                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1034                 runtime->audio_tstamp_report.valid = 0;
1035         } else
1036                 runtime->audio_tstamp_report.valid = 1;
1037
1038         status->state = runtime->state;
1039         status->suspended_state = runtime->suspended_state;
1040         if (status->state == SNDRV_PCM_STATE_OPEN)
1041                 goto _end;
1042         status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1043         status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1044         if (snd_pcm_running(substream)) {
1045                 snd_pcm_update_hw_ptr(substream);
1046                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1047                         status->tstamp_sec = runtime->status->tstamp.tv_sec;
1048                         status->tstamp_nsec =
1049                                 runtime->status->tstamp.tv_nsec;
1050                         status->driver_tstamp_sec =
1051                                 runtime->driver_tstamp.tv_sec;
1052                         status->driver_tstamp_nsec =
1053                                 runtime->driver_tstamp.tv_nsec;
1054                         status->audio_tstamp_sec =
1055                                 runtime->status->audio_tstamp.tv_sec;
1056                         status->audio_tstamp_nsec =
1057                                 runtime->status->audio_tstamp.tv_nsec;
1058                         if (runtime->audio_tstamp_report.valid == 1)
1059                                 /* backwards compatibility, no report provided in COMPAT mode */
1060                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1061                                                                 &status->audio_tstamp_accuracy,
1062                                                                 &runtime->audio_tstamp_report);
1063
1064                         goto _tstamp_end;
1065                 }
1066         } else {
1067                 /* get tstamp only in fallback mode and only if enabled */
1068                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1069                         struct timespec64 tstamp;
1070
1071                         snd_pcm_gettime(runtime, &tstamp);
1072                         status->tstamp_sec = tstamp.tv_sec;
1073                         status->tstamp_nsec = tstamp.tv_nsec;
1074                 }
1075         }
1076  _tstamp_end:
1077         status->appl_ptr = runtime->control->appl_ptr;
1078         status->hw_ptr = runtime->status->hw_ptr;
1079         status->avail = snd_pcm_avail(substream);
1080         status->delay = snd_pcm_running(substream) ?
1081                 snd_pcm_calc_delay(substream) : 0;
1082         status->avail_max = runtime->avail_max;
1083         status->overrange = runtime->overrange;
1084         runtime->avail_max = 0;
1085         runtime->overrange = 0;
1086  _end:
1087         snd_pcm_stream_unlock_irq(substream);
1088         return 0;
1089 }
1090
1091 static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1092                                  struct snd_pcm_status64 __user * _status,
1093                                  bool ext)
1094 {
1095         struct snd_pcm_status64 status;
1096         int res;
1097
1098         memset(&status, 0, sizeof(status));
1099         /*
1100          * with extension, parameters are read/write,
1101          * get audio_tstamp_data from user,
1102          * ignore rest of status structure
1103          */
1104         if (ext && get_user(status.audio_tstamp_data,
1105                                 (u32 __user *)(&_status->audio_tstamp_data)))
1106                 return -EFAULT;
1107         res = snd_pcm_status64(substream, &status);
1108         if (res < 0)
1109                 return res;
1110         if (copy_to_user(_status, &status, sizeof(status)))
1111                 return -EFAULT;
1112         return 0;
1113 }
1114
1115 static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1116                                  struct snd_pcm_status32 __user * _status,
1117                                  bool ext)
1118 {
1119         struct snd_pcm_status64 status64;
1120         struct snd_pcm_status32 status32;
1121         int res;
1122
1123         memset(&status64, 0, sizeof(status64));
1124         memset(&status32, 0, sizeof(status32));
1125         /*
1126          * with extension, parameters are read/write,
1127          * get audio_tstamp_data from user,
1128          * ignore rest of status structure
1129          */
1130         if (ext && get_user(status64.audio_tstamp_data,
1131                             (u32 __user *)(&_status->audio_tstamp_data)))
1132                 return -EFAULT;
1133         res = snd_pcm_status64(substream, &status64);
1134         if (res < 0)
1135                 return res;
1136
1137         status32 = (struct snd_pcm_status32) {
1138                 .state = status64.state,
1139                 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1140                 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1141                 .tstamp_sec = status64.tstamp_sec,
1142                 .tstamp_nsec = status64.tstamp_nsec,
1143                 .appl_ptr = status64.appl_ptr,
1144                 .hw_ptr = status64.hw_ptr,
1145                 .delay = status64.delay,
1146                 .avail = status64.avail,
1147                 .avail_max = status64.avail_max,
1148                 .overrange = status64.overrange,
1149                 .suspended_state = status64.suspended_state,
1150                 .audio_tstamp_data = status64.audio_tstamp_data,
1151                 .audio_tstamp_sec = status64.audio_tstamp_sec,
1152                 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1153                 .driver_tstamp_sec = status64.audio_tstamp_sec,
1154                 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1155                 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1156         };
1157
1158         if (copy_to_user(_status, &status32, sizeof(status32)))
1159                 return -EFAULT;
1160
1161         return 0;
1162 }
1163
1164 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1165                                 struct snd_pcm_channel_info * info)
1166 {
1167         struct snd_pcm_runtime *runtime;
1168         unsigned int channel;
1169
1170         channel = info->channel;
1171         runtime = substream->runtime;
1172         snd_pcm_stream_lock_irq(substream);
1173         if (runtime->state == SNDRV_PCM_STATE_OPEN) {
1174                 snd_pcm_stream_unlock_irq(substream);
1175                 return -EBADFD;
1176         }
1177         snd_pcm_stream_unlock_irq(substream);
1178         if (channel >= runtime->channels)
1179                 return -EINVAL;
1180         memset(info, 0, sizeof(*info));
1181         info->channel = channel;
1182         return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1183 }
1184
1185 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1186                                      struct snd_pcm_channel_info __user * _info)
1187 {
1188         struct snd_pcm_channel_info info;
1189         int res;
1190
1191         if (copy_from_user(&info, _info, sizeof(info)))
1192                 return -EFAULT;
1193         res = snd_pcm_channel_info(substream, &info);
1194         if (res < 0)
1195                 return res;
1196         if (copy_to_user(_info, &info, sizeof(info)))
1197                 return -EFAULT;
1198         return 0;
1199 }
1200
1201 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1202 {
1203         struct snd_pcm_runtime *runtime = substream->runtime;
1204         if (runtime->trigger_master == NULL)
1205                 return;
1206         if (runtime->trigger_master == substream) {
1207                 if (!runtime->trigger_tstamp_latched)
1208                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1209         } else {
1210                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1211                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1212         }
1213         runtime->trigger_master = NULL;
1214 }
1215
1216 #define ACTION_ARG_IGNORE       (__force snd_pcm_state_t)0
1217
1218 struct action_ops {
1219         int (*pre_action)(struct snd_pcm_substream *substream,
1220                           snd_pcm_state_t state);
1221         int (*do_action)(struct snd_pcm_substream *substream,
1222                          snd_pcm_state_t state);
1223         void (*undo_action)(struct snd_pcm_substream *substream,
1224                             snd_pcm_state_t state);
1225         void (*post_action)(struct snd_pcm_substream *substream,
1226                             snd_pcm_state_t state);
1227 };
1228
1229 /*
1230  *  this functions is core for handling of linked stream
1231  *  Note: the stream state might be changed also on failure
1232  *  Note2: call with calling stream lock + link lock
1233  */
1234 static int snd_pcm_action_group(const struct action_ops *ops,
1235                                 struct snd_pcm_substream *substream,
1236                                 snd_pcm_state_t state,
1237                                 bool stream_lock)
1238 {
1239         struct snd_pcm_substream *s = NULL;
1240         struct snd_pcm_substream *s1;
1241         int res = 0, depth = 1;
1242
1243         snd_pcm_group_for_each_entry(s, substream) {
1244                 if (s != substream) {
1245                         if (!stream_lock)
1246                                 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1247                         else if (s->pcm->nonatomic)
1248                                 mutex_lock_nested(&s->self_group.mutex, depth);
1249                         else
1250                                 spin_lock_nested(&s->self_group.lock, depth);
1251                         depth++;
1252                 }
1253                 res = ops->pre_action(s, state);
1254                 if (res < 0)
1255                         goto _unlock;
1256         }
1257         snd_pcm_group_for_each_entry(s, substream) {
1258                 res = ops->do_action(s, state);
1259                 if (res < 0) {
1260                         if (ops->undo_action) {
1261                                 snd_pcm_group_for_each_entry(s1, substream) {
1262                                         if (s1 == s) /* failed stream */
1263                                                 break;
1264                                         ops->undo_action(s1, state);
1265                                 }
1266                         }
1267                         s = NULL; /* unlock all */
1268                         goto _unlock;
1269                 }
1270         }
1271         snd_pcm_group_for_each_entry(s, substream) {
1272                 ops->post_action(s, state);
1273         }
1274  _unlock:
1275         /* unlock streams */
1276         snd_pcm_group_for_each_entry(s1, substream) {
1277                 if (s1 != substream) {
1278                         if (!stream_lock)
1279                                 mutex_unlock(&s1->runtime->buffer_mutex);
1280                         else if (s1->pcm->nonatomic)
1281                                 mutex_unlock(&s1->self_group.mutex);
1282                         else
1283                                 spin_unlock(&s1->self_group.lock);
1284                 }
1285                 if (s1 == s)    /* end */
1286                         break;
1287         }
1288         return res;
1289 }
1290
1291 /*
1292  *  Note: call with stream lock
1293  */
1294 static int snd_pcm_action_single(const struct action_ops *ops,
1295                                  struct snd_pcm_substream *substream,
1296                                  snd_pcm_state_t state)
1297 {
1298         int res;
1299
1300         res = ops->pre_action(substream, state);
1301         if (res < 0)
1302                 return res;
1303         res = ops->do_action(substream, state);
1304         if (res == 0)
1305                 ops->post_action(substream, state);
1306         else if (ops->undo_action)
1307                 ops->undo_action(substream, state);
1308         return res;
1309 }
1310
1311 static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1312                                  struct snd_pcm_group *new_group)
1313 {
1314         substream->group = new_group;
1315         list_move(&substream->link_list, &new_group->substreams);
1316 }
1317
1318 /*
1319  * Unref and unlock the group, but keep the stream lock;
1320  * when the group becomes empty and no longer referred, destroy itself
1321  */
1322 static void snd_pcm_group_unref(struct snd_pcm_group *group,
1323                                 struct snd_pcm_substream *substream)
1324 {
1325         bool do_free;
1326
1327         if (!group)
1328                 return;
1329         do_free = refcount_dec_and_test(&group->refs);
1330         snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1331         if (do_free)
1332                 kfree(group);
1333 }
1334
1335 /*
1336  * Lock the group inside a stream lock and reference it;
1337  * return the locked group object, or NULL if not linked
1338  */
1339 static struct snd_pcm_group *
1340 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1341 {
1342         bool nonatomic = substream->pcm->nonatomic;
1343         struct snd_pcm_group *group;
1344         bool trylock;
1345
1346         for (;;) {
1347                 if (!snd_pcm_stream_linked(substream))
1348                         return NULL;
1349                 group = substream->group;
1350                 /* block freeing the group object */
1351                 refcount_inc(&group->refs);
1352
1353                 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1354                         spin_trylock(&group->lock);
1355                 if (trylock)
1356                         break; /* OK */
1357
1358                 /* re-lock for avoiding ABBA deadlock */
1359                 snd_pcm_stream_unlock(substream);
1360                 snd_pcm_group_lock(group, nonatomic);
1361                 snd_pcm_stream_lock(substream);
1362
1363                 /* check the group again; the above opens a small race window */
1364                 if (substream->group == group)
1365                         break; /* OK */
1366                 /* group changed, try again */
1367                 snd_pcm_group_unref(group, substream);
1368         }
1369         return group;
1370 }
1371
1372 /*
1373  *  Note: call with stream lock
1374  */
1375 static int snd_pcm_action(const struct action_ops *ops,
1376                           struct snd_pcm_substream *substream,
1377                           snd_pcm_state_t state)
1378 {
1379         struct snd_pcm_group *group;
1380         int res;
1381
1382         group = snd_pcm_stream_group_ref(substream);
1383         if (group)
1384                 res = snd_pcm_action_group(ops, substream, state, true);
1385         else
1386                 res = snd_pcm_action_single(ops, substream, state);
1387         snd_pcm_group_unref(group, substream);
1388         return res;
1389 }
1390
1391 /*
1392  *  Note: don't use any locks before
1393  */
1394 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1395                                    struct snd_pcm_substream *substream,
1396                                    snd_pcm_state_t state)
1397 {
1398         int res;
1399
1400         snd_pcm_stream_lock_irq(substream);
1401         res = snd_pcm_action(ops, substream, state);
1402         snd_pcm_stream_unlock_irq(substream);
1403         return res;
1404 }
1405
1406 /*
1407  */
1408 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1409                                     struct snd_pcm_substream *substream,
1410                                     snd_pcm_state_t state)
1411 {
1412         int res;
1413
1414         /* Guarantee the group members won't change during non-atomic action */
1415         down_read(&snd_pcm_link_rwsem);
1416         res = snd_pcm_buffer_access_lock(substream->runtime);
1417         if (res < 0)
1418                 goto unlock;
1419         if (snd_pcm_stream_linked(substream))
1420                 res = snd_pcm_action_group(ops, substream, state, false);
1421         else
1422                 res = snd_pcm_action_single(ops, substream, state);
1423         snd_pcm_buffer_access_unlock(substream->runtime);
1424  unlock:
1425         up_read(&snd_pcm_link_rwsem);
1426         return res;
1427 }
1428
1429 /*
1430  * start callbacks
1431  */
1432 static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1433                              snd_pcm_state_t state)
1434 {
1435         struct snd_pcm_runtime *runtime = substream->runtime;
1436         if (runtime->state != SNDRV_PCM_STATE_PREPARED)
1437                 return -EBADFD;
1438         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1439             !snd_pcm_playback_data(substream))
1440                 return -EPIPE;
1441         runtime->trigger_tstamp_latched = false;
1442         runtime->trigger_master = substream;
1443         return 0;
1444 }
1445
1446 static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1447                             snd_pcm_state_t state)
1448 {
1449         int err;
1450
1451         if (substream->runtime->trigger_master != substream)
1452                 return 0;
1453         err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1454         /* XRUN happened during the start */
1455         if (err == -EPIPE)
1456                 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN);
1457         return err;
1458 }
1459
1460 static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1461                                snd_pcm_state_t state)
1462 {
1463         if (substream->runtime->trigger_master == substream) {
1464                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1465                 substream->runtime->stop_operating = true;
1466         }
1467 }
1468
1469 static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1470                                snd_pcm_state_t state)
1471 {
1472         struct snd_pcm_runtime *runtime = substream->runtime;
1473         snd_pcm_trigger_tstamp(substream);
1474         runtime->hw_ptr_jiffies = jiffies;
1475         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1476                                                             runtime->rate;
1477         __snd_pcm_set_state(runtime, state);
1478         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1479             runtime->silence_size > 0)
1480                 snd_pcm_playback_silence(substream, ULONG_MAX);
1481         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1482 }
1483
1484 static const struct action_ops snd_pcm_action_start = {
1485         .pre_action = snd_pcm_pre_start,
1486         .do_action = snd_pcm_do_start,
1487         .undo_action = snd_pcm_undo_start,
1488         .post_action = snd_pcm_post_start
1489 };
1490
1491 /**
1492  * snd_pcm_start - start all linked streams
1493  * @substream: the PCM substream instance
1494  *
1495  * Return: Zero if successful, or a negative error code.
1496  * The stream lock must be acquired before calling this function.
1497  */
1498 int snd_pcm_start(struct snd_pcm_substream *substream)
1499 {
1500         return snd_pcm_action(&snd_pcm_action_start, substream,
1501                               SNDRV_PCM_STATE_RUNNING);
1502 }
1503
1504 /* take the stream lock and start the streams */
1505 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1506 {
1507         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1508                                        SNDRV_PCM_STATE_RUNNING);
1509 }
1510
1511 /*
1512  * stop callbacks
1513  */
1514 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1515                             snd_pcm_state_t state)
1516 {
1517         struct snd_pcm_runtime *runtime = substream->runtime;
1518         if (runtime->state == SNDRV_PCM_STATE_OPEN)
1519                 return -EBADFD;
1520         runtime->trigger_master = substream;
1521         return 0;
1522 }
1523
1524 static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1525                            snd_pcm_state_t state)
1526 {
1527         if (substream->runtime->trigger_master == substream &&
1528             snd_pcm_running(substream)) {
1529                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1530                 substream->runtime->stop_operating = true;
1531         }
1532         return 0; /* unconditionally stop all substreams */
1533 }
1534
1535 static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1536                               snd_pcm_state_t state)
1537 {
1538         struct snd_pcm_runtime *runtime = substream->runtime;
1539         if (runtime->state != state) {
1540                 snd_pcm_trigger_tstamp(substream);
1541                 __snd_pcm_set_state(runtime, state);
1542                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1543         }
1544         wake_up(&runtime->sleep);
1545         wake_up(&runtime->tsleep);
1546 }
1547
1548 static const struct action_ops snd_pcm_action_stop = {
1549         .pre_action = snd_pcm_pre_stop,
1550         .do_action = snd_pcm_do_stop,
1551         .post_action = snd_pcm_post_stop
1552 };
1553
1554 /**
1555  * snd_pcm_stop - try to stop all running streams in the substream group
1556  * @substream: the PCM substream instance
1557  * @state: PCM state after stopping the stream
1558  *
1559  * The state of each stream is then changed to the given state unconditionally.
1560  *
1561  * Return: Zero if successful, or a negative error code.
1562  */
1563 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1564 {
1565         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1566 }
1567 EXPORT_SYMBOL(snd_pcm_stop);
1568
1569 /**
1570  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1571  * @substream: the PCM substream
1572  *
1573  * After stopping, the state is changed to SETUP.
1574  * Unlike snd_pcm_stop(), this affects only the given stream.
1575  *
1576  * Return: Zero if successful, or a negative error code.
1577  */
1578 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1579 {
1580         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1581                                      SNDRV_PCM_STATE_SETUP);
1582 }
1583
1584 /**
1585  * snd_pcm_stop_xrun - stop the running streams as XRUN
1586  * @substream: the PCM substream instance
1587  *
1588  * This stops the given running substream (and all linked substreams) as XRUN.
1589  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1590  *
1591  * Return: Zero if successful, or a negative error code.
1592  */
1593 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1594 {
1595         unsigned long flags;
1596
1597         snd_pcm_stream_lock_irqsave(substream, flags);
1598         if (substream->runtime && snd_pcm_running(substream))
1599                 __snd_pcm_xrun(substream);
1600         snd_pcm_stream_unlock_irqrestore(substream, flags);
1601         return 0;
1602 }
1603 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1604
1605 /*
1606  * pause callbacks: pass boolean (to start pause or resume) as state argument
1607  */
1608 #define pause_pushed(state)     (__force bool)(state)
1609
1610 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1611                              snd_pcm_state_t state)
1612 {
1613         struct snd_pcm_runtime *runtime = substream->runtime;
1614         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1615                 return -ENOSYS;
1616         if (pause_pushed(state)) {
1617                 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1618                         return -EBADFD;
1619         } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1620                 return -EBADFD;
1621         runtime->trigger_master = substream;
1622         return 0;
1623 }
1624
1625 static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1626                             snd_pcm_state_t state)
1627 {
1628         if (substream->runtime->trigger_master != substream)
1629                 return 0;
1630         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1631          * a delta between the current jiffies, this gives a large enough
1632          * delta, effectively to skip the check once.
1633          */
1634         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1635         return substream->ops->trigger(substream,
1636                                        pause_pushed(state) ?
1637                                        SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1638                                        SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1639 }
1640
1641 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1642                                snd_pcm_state_t state)
1643 {
1644         if (substream->runtime->trigger_master == substream)
1645                 substream->ops->trigger(substream,
1646                                         pause_pushed(state) ?
1647                                         SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1648                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1649 }
1650
1651 static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1652                                snd_pcm_state_t state)
1653 {
1654         struct snd_pcm_runtime *runtime = substream->runtime;
1655         snd_pcm_trigger_tstamp(substream);
1656         if (pause_pushed(state)) {
1657                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1658                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1659                 wake_up(&runtime->sleep);
1660                 wake_up(&runtime->tsleep);
1661         } else {
1662                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1663                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1664         }
1665 }
1666
1667 static const struct action_ops snd_pcm_action_pause = {
1668         .pre_action = snd_pcm_pre_pause,
1669         .do_action = snd_pcm_do_pause,
1670         .undo_action = snd_pcm_undo_pause,
1671         .post_action = snd_pcm_post_pause
1672 };
1673
1674 /*
1675  * Push/release the pause for all linked streams.
1676  */
1677 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1678 {
1679         return snd_pcm_action(&snd_pcm_action_pause, substream,
1680                               (__force snd_pcm_state_t)push);
1681 }
1682
1683 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1684                                   bool push)
1685 {
1686         return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1687                                        (__force snd_pcm_state_t)push);
1688 }
1689
1690 #ifdef CONFIG_PM
1691 /* suspend callback: state argument ignored */
1692
1693 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1694                                snd_pcm_state_t state)
1695 {
1696         struct snd_pcm_runtime *runtime = substream->runtime;
1697         switch (runtime->state) {
1698         case SNDRV_PCM_STATE_SUSPENDED:
1699                 return -EBUSY;
1700         /* unresumable PCM state; return -EBUSY for skipping suspend */
1701         case SNDRV_PCM_STATE_OPEN:
1702         case SNDRV_PCM_STATE_SETUP:
1703         case SNDRV_PCM_STATE_DISCONNECTED:
1704                 return -EBUSY;
1705         }
1706         runtime->trigger_master = substream;
1707         return 0;
1708 }
1709
1710 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1711                               snd_pcm_state_t state)
1712 {
1713         struct snd_pcm_runtime *runtime = substream->runtime;
1714         if (runtime->trigger_master != substream)
1715                 return 0;
1716         if (! snd_pcm_running(substream))
1717                 return 0;
1718         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1719         runtime->stop_operating = true;
1720         return 0; /* suspend unconditionally */
1721 }
1722
1723 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1724                                  snd_pcm_state_t state)
1725 {
1726         struct snd_pcm_runtime *runtime = substream->runtime;
1727         snd_pcm_trigger_tstamp(substream);
1728         runtime->suspended_state = runtime->state;
1729         runtime->status->suspended_state = runtime->suspended_state;
1730         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1731         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1732         wake_up(&runtime->sleep);
1733         wake_up(&runtime->tsleep);
1734 }
1735
1736 static const struct action_ops snd_pcm_action_suspend = {
1737         .pre_action = snd_pcm_pre_suspend,
1738         .do_action = snd_pcm_do_suspend,
1739         .post_action = snd_pcm_post_suspend
1740 };
1741
1742 /*
1743  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1744  * @substream: the PCM substream
1745  *
1746  * After this call, all streams are changed to SUSPENDED state.
1747  *
1748  * Return: Zero if successful, or a negative error code.
1749  */
1750 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1751 {
1752         int err;
1753         unsigned long flags;
1754
1755         snd_pcm_stream_lock_irqsave(substream, flags);
1756         err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1757                              ACTION_ARG_IGNORE);
1758         snd_pcm_stream_unlock_irqrestore(substream, flags);
1759         return err;
1760 }
1761
1762 /**
1763  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1764  * @pcm: the PCM instance
1765  *
1766  * After this call, all streams are changed to SUSPENDED state.
1767  *
1768  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1769  */
1770 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1771 {
1772         struct snd_pcm_substream *substream;
1773         int stream, err = 0;
1774
1775         if (! pcm)
1776                 return 0;
1777
1778         for_each_pcm_substream(pcm, stream, substream) {
1779                 /* FIXME: the open/close code should lock this as well */
1780                 if (!substream->runtime)
1781                         continue;
1782
1783                 /*
1784                  * Skip BE dai link PCM's that are internal and may
1785                  * not have their substream ops set.
1786                  */
1787                 if (!substream->ops)
1788                         continue;
1789
1790                 err = snd_pcm_suspend(substream);
1791                 if (err < 0 && err != -EBUSY)
1792                         return err;
1793         }
1794
1795         for_each_pcm_substream(pcm, stream, substream)
1796                 snd_pcm_sync_stop(substream, false);
1797
1798         return 0;
1799 }
1800 EXPORT_SYMBOL(snd_pcm_suspend_all);
1801
1802 /* resume callbacks: state argument ignored */
1803
1804 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1805                               snd_pcm_state_t state)
1806 {
1807         struct snd_pcm_runtime *runtime = substream->runtime;
1808         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1809                 return -ENOSYS;
1810         runtime->trigger_master = substream;
1811         return 0;
1812 }
1813
1814 static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1815                              snd_pcm_state_t state)
1816 {
1817         struct snd_pcm_runtime *runtime = substream->runtime;
1818         if (runtime->trigger_master != substream)
1819                 return 0;
1820         /* DMA not running previously? */
1821         if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1822             (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1823              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1824                 return 0;
1825         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1826 }
1827
1828 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1829                                 snd_pcm_state_t state)
1830 {
1831         if (substream->runtime->trigger_master == substream &&
1832             snd_pcm_running(substream))
1833                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1834 }
1835
1836 static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1837                                 snd_pcm_state_t state)
1838 {
1839         struct snd_pcm_runtime *runtime = substream->runtime;
1840         snd_pcm_trigger_tstamp(substream);
1841         __snd_pcm_set_state(runtime, runtime->suspended_state);
1842         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1843 }
1844
1845 static const struct action_ops snd_pcm_action_resume = {
1846         .pre_action = snd_pcm_pre_resume,
1847         .do_action = snd_pcm_do_resume,
1848         .undo_action = snd_pcm_undo_resume,
1849         .post_action = snd_pcm_post_resume
1850 };
1851
1852 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1853 {
1854         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1855                                        ACTION_ARG_IGNORE);
1856 }
1857
1858 #else
1859
1860 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1861 {
1862         return -ENOSYS;
1863 }
1864
1865 #endif /* CONFIG_PM */
1866
1867 /*
1868  * xrun ioctl
1869  *
1870  * Change the RUNNING stream(s) to XRUN state.
1871  */
1872 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1873 {
1874         struct snd_pcm_runtime *runtime = substream->runtime;
1875         int result;
1876
1877         snd_pcm_stream_lock_irq(substream);
1878         switch (runtime->state) {
1879         case SNDRV_PCM_STATE_XRUN:
1880                 result = 0;     /* already there */
1881                 break;
1882         case SNDRV_PCM_STATE_RUNNING:
1883                 __snd_pcm_xrun(substream);
1884                 result = 0;
1885                 break;
1886         default:
1887                 result = -EBADFD;
1888         }
1889         snd_pcm_stream_unlock_irq(substream);
1890         return result;
1891 }
1892
1893 /*
1894  * reset ioctl
1895  */
1896 /* reset callbacks:  state argument ignored */
1897 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1898                              snd_pcm_state_t state)
1899 {
1900         struct snd_pcm_runtime *runtime = substream->runtime;
1901         switch (runtime->state) {
1902         case SNDRV_PCM_STATE_RUNNING:
1903         case SNDRV_PCM_STATE_PREPARED:
1904         case SNDRV_PCM_STATE_PAUSED:
1905         case SNDRV_PCM_STATE_SUSPENDED:
1906                 return 0;
1907         default:
1908                 return -EBADFD;
1909         }
1910 }
1911
1912 static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1913                             snd_pcm_state_t state)
1914 {
1915         struct snd_pcm_runtime *runtime = substream->runtime;
1916         int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1917         if (err < 0)
1918                 return err;
1919         snd_pcm_stream_lock_irq(substream);
1920         runtime->hw_ptr_base = 0;
1921         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1922                 runtime->status->hw_ptr % runtime->period_size;
1923         runtime->silence_start = runtime->status->hw_ptr;
1924         runtime->silence_filled = 0;
1925         snd_pcm_stream_unlock_irq(substream);
1926         return 0;
1927 }
1928
1929 static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1930                                snd_pcm_state_t state)
1931 {
1932         struct snd_pcm_runtime *runtime = substream->runtime;
1933         snd_pcm_stream_lock_irq(substream);
1934         runtime->control->appl_ptr = runtime->status->hw_ptr;
1935         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1936             runtime->silence_size > 0)
1937                 snd_pcm_playback_silence(substream, ULONG_MAX);
1938         snd_pcm_stream_unlock_irq(substream);
1939 }
1940
1941 static const struct action_ops snd_pcm_action_reset = {
1942         .pre_action = snd_pcm_pre_reset,
1943         .do_action = snd_pcm_do_reset,
1944         .post_action = snd_pcm_post_reset
1945 };
1946
1947 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1948 {
1949         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1950                                         ACTION_ARG_IGNORE);
1951 }
1952
1953 /*
1954  * prepare ioctl
1955  */
1956 /* pass f_flags as state argument */
1957 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1958                                snd_pcm_state_t state)
1959 {
1960         struct snd_pcm_runtime *runtime = substream->runtime;
1961         int f_flags = (__force int)state;
1962
1963         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1964             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1965                 return -EBADFD;
1966         if (snd_pcm_running(substream))
1967                 return -EBUSY;
1968         substream->f_flags = f_flags;
1969         return 0;
1970 }
1971
1972 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1973                               snd_pcm_state_t state)
1974 {
1975         int err;
1976         snd_pcm_sync_stop(substream, true);
1977         err = substream->ops->prepare(substream);
1978         if (err < 0)
1979                 return err;
1980         return snd_pcm_do_reset(substream, state);
1981 }
1982
1983 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1984                                  snd_pcm_state_t state)
1985 {
1986         struct snd_pcm_runtime *runtime = substream->runtime;
1987         runtime->control->appl_ptr = runtime->status->hw_ptr;
1988         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1989 }
1990
1991 static const struct action_ops snd_pcm_action_prepare = {
1992         .pre_action = snd_pcm_pre_prepare,
1993         .do_action = snd_pcm_do_prepare,
1994         .post_action = snd_pcm_post_prepare
1995 };
1996
1997 /**
1998  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1999  * @substream: the PCM substream instance
2000  * @file: file to refer f_flags
2001  *
2002  * Return: Zero if successful, or a negative error code.
2003  */
2004 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
2005                            struct file *file)
2006 {
2007         int f_flags;
2008
2009         if (file)
2010                 f_flags = file->f_flags;
2011         else
2012                 f_flags = substream->f_flags;
2013
2014         snd_pcm_stream_lock_irq(substream);
2015         switch (substream->runtime->state) {
2016         case SNDRV_PCM_STATE_PAUSED:
2017                 snd_pcm_pause(substream, false);
2018                 fallthrough;
2019         case SNDRV_PCM_STATE_SUSPENDED:
2020                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2021                 break;
2022         }
2023         snd_pcm_stream_unlock_irq(substream);
2024
2025         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
2026                                         substream,
2027                                         (__force snd_pcm_state_t)f_flags);
2028 }
2029
2030 /*
2031  * drain ioctl
2032  */
2033
2034 /* drain init callbacks: state argument ignored */
2035 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2036                                   snd_pcm_state_t state)
2037 {
2038         struct snd_pcm_runtime *runtime = substream->runtime;
2039         switch (runtime->state) {
2040         case SNDRV_PCM_STATE_OPEN:
2041         case SNDRV_PCM_STATE_DISCONNECTED:
2042         case SNDRV_PCM_STATE_SUSPENDED:
2043                 return -EBADFD;
2044         }
2045         runtime->trigger_master = substream;
2046         return 0;
2047 }
2048
2049 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2050                                  snd_pcm_state_t state)
2051 {
2052         struct snd_pcm_runtime *runtime = substream->runtime;
2053         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2054                 switch (runtime->state) {
2055                 case SNDRV_PCM_STATE_PREPARED:
2056                         /* start playback stream if possible */
2057                         if (! snd_pcm_playback_empty(substream)) {
2058                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2059                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2060                         } else {
2061                                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2062                         }
2063                         break;
2064                 case SNDRV_PCM_STATE_RUNNING:
2065                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2066                         break;
2067                 case SNDRV_PCM_STATE_XRUN:
2068                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2069                         break;
2070                 default:
2071                         break;
2072                 }
2073         } else {
2074                 /* stop running stream */
2075                 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2076                         snd_pcm_state_t new_state;
2077
2078                         new_state = snd_pcm_capture_avail(runtime) > 0 ?
2079                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2080                         snd_pcm_do_stop(substream, new_state);
2081                         snd_pcm_post_stop(substream, new_state);
2082                 }
2083         }
2084
2085         if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2086             runtime->trigger_master == substream &&
2087             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2088                 return substream->ops->trigger(substream,
2089                                                SNDRV_PCM_TRIGGER_DRAIN);
2090
2091         return 0;
2092 }
2093
2094 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2095                                     snd_pcm_state_t state)
2096 {
2097 }
2098
2099 static const struct action_ops snd_pcm_action_drain_init = {
2100         .pre_action = snd_pcm_pre_drain_init,
2101         .do_action = snd_pcm_do_drain_init,
2102         .post_action = snd_pcm_post_drain_init
2103 };
2104
2105 /*
2106  * Drain the stream(s).
2107  * When the substream is linked, sync until the draining of all playback streams
2108  * is finished.
2109  * After this call, all streams are supposed to be either SETUP or DRAINING
2110  * (capture only) state.
2111  */
2112 static int snd_pcm_drain(struct snd_pcm_substream *substream,
2113                          struct file *file)
2114 {
2115         struct snd_card *card;
2116         struct snd_pcm_runtime *runtime;
2117         struct snd_pcm_substream *s;
2118         struct snd_pcm_group *group;
2119         wait_queue_entry_t wait;
2120         int result = 0;
2121         int nonblock = 0;
2122
2123         card = substream->pcm->card;
2124         runtime = substream->runtime;
2125
2126         if (runtime->state == SNDRV_PCM_STATE_OPEN)
2127                 return -EBADFD;
2128
2129         if (file) {
2130                 if (file->f_flags & O_NONBLOCK)
2131                         nonblock = 1;
2132         } else if (substream->f_flags & O_NONBLOCK)
2133                 nonblock = 1;
2134
2135         snd_pcm_stream_lock_irq(substream);
2136         /* resume pause */
2137         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2138                 snd_pcm_pause(substream, false);
2139
2140         /* pre-start/stop - all running streams are changed to DRAINING state */
2141         result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2142                                 ACTION_ARG_IGNORE);
2143         if (result < 0)
2144                 goto unlock;
2145         /* in non-blocking, we don't wait in ioctl but let caller poll */
2146         if (nonblock) {
2147                 result = -EAGAIN;
2148                 goto unlock;
2149         }
2150
2151         for (;;) {
2152                 long tout;
2153                 struct snd_pcm_runtime *to_check;
2154                 if (signal_pending(current)) {
2155                         result = -ERESTARTSYS;
2156                         break;
2157                 }
2158                 /* find a substream to drain */
2159                 to_check = NULL;
2160                 group = snd_pcm_stream_group_ref(substream);
2161                 snd_pcm_group_for_each_entry(s, substream) {
2162                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2163                                 continue;
2164                         runtime = s->runtime;
2165                         if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2166                                 to_check = runtime;
2167                                 break;
2168                         }
2169                 }
2170                 snd_pcm_group_unref(group, substream);
2171                 if (!to_check)
2172                         break; /* all drained */
2173                 init_waitqueue_entry(&wait, current);
2174                 set_current_state(TASK_INTERRUPTIBLE);
2175                 add_wait_queue(&to_check->sleep, &wait);
2176                 snd_pcm_stream_unlock_irq(substream);
2177                 if (runtime->no_period_wakeup)
2178                         tout = MAX_SCHEDULE_TIMEOUT;
2179                 else {
2180                         tout = 100;
2181                         if (runtime->rate) {
2182                                 long t = runtime->buffer_size * 1100 / runtime->rate;
2183                                 tout = max(t, tout);
2184                         }
2185                         tout = msecs_to_jiffies(tout);
2186                 }
2187                 tout = schedule_timeout(tout);
2188
2189                 snd_pcm_stream_lock_irq(substream);
2190                 group = snd_pcm_stream_group_ref(substream);
2191                 snd_pcm_group_for_each_entry(s, substream) {
2192                         if (s->runtime == to_check) {
2193                                 remove_wait_queue(&to_check->sleep, &wait);
2194                                 break;
2195                         }
2196                 }
2197                 snd_pcm_group_unref(group, substream);
2198
2199                 if (card->shutdown) {
2200                         result = -ENODEV;
2201                         break;
2202                 }
2203                 if (tout == 0) {
2204                         if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2205                                 result = -ESTRPIPE;
2206                         else {
2207                                 dev_dbg(substream->pcm->card->dev,
2208                                         "playback drain timeout (DMA or IRQ trouble?)\n");
2209                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2210                                 result = -EIO;
2211                         }
2212                         break;
2213                 }
2214         }
2215
2216  unlock:
2217         snd_pcm_stream_unlock_irq(substream);
2218
2219         return result;
2220 }
2221
2222 /*
2223  * drop ioctl
2224  *
2225  * Immediately put all linked substreams into SETUP state.
2226  */
2227 static int snd_pcm_drop(struct snd_pcm_substream *substream)
2228 {
2229         struct snd_pcm_runtime *runtime;
2230         int result = 0;
2231
2232         if (PCM_RUNTIME_CHECK(substream))
2233                 return -ENXIO;
2234         runtime = substream->runtime;
2235
2236         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2237             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2238                 return -EBADFD;
2239
2240         snd_pcm_stream_lock_irq(substream);
2241         /* resume pause */
2242         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2243                 snd_pcm_pause(substream, false);
2244
2245         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2246         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2247         snd_pcm_stream_unlock_irq(substream);
2248
2249         return result;
2250 }
2251
2252
2253 static bool is_pcm_file(struct file *file)
2254 {
2255         struct inode *inode = file_inode(file);
2256         struct snd_pcm *pcm;
2257         unsigned int minor;
2258
2259         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2260                 return false;
2261         minor = iminor(inode);
2262         pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2263         if (!pcm)
2264                 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2265         if (!pcm)
2266                 return false;
2267         snd_card_unref(pcm->card);
2268         return true;
2269 }
2270
2271 /*
2272  * PCM link handling
2273  */
2274 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2275 {
2276         int res = 0;
2277         struct snd_pcm_file *pcm_file;
2278         struct snd_pcm_substream *substream1;
2279         struct snd_pcm_group *group, *target_group;
2280         bool nonatomic = substream->pcm->nonatomic;
2281         struct fd f = fdget(fd);
2282
2283         if (!f.file)
2284                 return -EBADFD;
2285         if (!is_pcm_file(f.file)) {
2286                 res = -EBADFD;
2287                 goto _badf;
2288         }
2289         pcm_file = f.file->private_data;
2290         substream1 = pcm_file->substream;
2291
2292         if (substream == substream1) {
2293                 res = -EINVAL;
2294                 goto _badf;
2295         }
2296
2297         group = kzalloc(sizeof(*group), GFP_KERNEL);
2298         if (!group) {
2299                 res = -ENOMEM;
2300                 goto _nolock;
2301         }
2302         snd_pcm_group_init(group);
2303
2304         down_write(&snd_pcm_link_rwsem);
2305         if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2306             substream->runtime->state != substream1->runtime->state ||
2307             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2308                 res = -EBADFD;
2309                 goto _end;
2310         }
2311         if (snd_pcm_stream_linked(substream1)) {
2312                 res = -EALREADY;
2313                 goto _end;
2314         }
2315
2316         snd_pcm_stream_lock_irq(substream);
2317         if (!snd_pcm_stream_linked(substream)) {
2318                 snd_pcm_group_assign(substream, group);
2319                 group = NULL; /* assigned, don't free this one below */
2320         }
2321         target_group = substream->group;
2322         snd_pcm_stream_unlock_irq(substream);
2323
2324         snd_pcm_group_lock_irq(target_group, nonatomic);
2325         snd_pcm_stream_lock_nested(substream1);
2326         snd_pcm_group_assign(substream1, target_group);
2327         refcount_inc(&target_group->refs);
2328         snd_pcm_stream_unlock(substream1);
2329         snd_pcm_group_unlock_irq(target_group, nonatomic);
2330  _end:
2331         up_write(&snd_pcm_link_rwsem);
2332  _nolock:
2333         kfree(group);
2334  _badf:
2335         fdput(f);
2336         return res;
2337 }
2338
2339 static void relink_to_local(struct snd_pcm_substream *substream)
2340 {
2341         snd_pcm_stream_lock_nested(substream);
2342         snd_pcm_group_assign(substream, &substream->self_group);
2343         snd_pcm_stream_unlock(substream);
2344 }
2345
2346 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2347 {
2348         struct snd_pcm_group *group;
2349         bool nonatomic = substream->pcm->nonatomic;
2350         bool do_free = false;
2351         int res = 0;
2352
2353         down_write(&snd_pcm_link_rwsem);
2354
2355         if (!snd_pcm_stream_linked(substream)) {
2356                 res = -EALREADY;
2357                 goto _end;
2358         }
2359
2360         group = substream->group;
2361         snd_pcm_group_lock_irq(group, nonatomic);
2362
2363         relink_to_local(substream);
2364         refcount_dec(&group->refs);
2365
2366         /* detach the last stream, too */
2367         if (list_is_singular(&group->substreams)) {
2368                 relink_to_local(list_first_entry(&group->substreams,
2369                                                  struct snd_pcm_substream,
2370                                                  link_list));
2371                 do_free = refcount_dec_and_test(&group->refs);
2372         }
2373
2374         snd_pcm_group_unlock_irq(group, nonatomic);
2375         if (do_free)
2376                 kfree(group);
2377
2378        _end:
2379         up_write(&snd_pcm_link_rwsem);
2380         return res;
2381 }
2382
2383 /*
2384  * hw configurator
2385  */
2386 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2387                                struct snd_pcm_hw_rule *rule)
2388 {
2389         struct snd_interval t;
2390         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2391                      hw_param_interval_c(params, rule->deps[1]), &t);
2392         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2393 }
2394
2395 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2396                                struct snd_pcm_hw_rule *rule)
2397 {
2398         struct snd_interval t;
2399         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2400                      hw_param_interval_c(params, rule->deps[1]), &t);
2401         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2402 }
2403
2404 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2405                                    struct snd_pcm_hw_rule *rule)
2406 {
2407         struct snd_interval t;
2408         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2409                          hw_param_interval_c(params, rule->deps[1]),
2410                          (unsigned long) rule->private, &t);
2411         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2412 }
2413
2414 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2415                                    struct snd_pcm_hw_rule *rule)
2416 {
2417         struct snd_interval t;
2418         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2419                          (unsigned long) rule->private,
2420                          hw_param_interval_c(params, rule->deps[1]), &t);
2421         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2422 }
2423
2424 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2425                                   struct snd_pcm_hw_rule *rule)
2426 {
2427         snd_pcm_format_t k;
2428         const struct snd_interval *i =
2429                                 hw_param_interval_c(params, rule->deps[0]);
2430         struct snd_mask m;
2431         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2432         snd_mask_any(&m);
2433         pcm_for_each_format(k) {
2434                 int bits;
2435                 if (!snd_mask_test_format(mask, k))
2436                         continue;
2437                 bits = snd_pcm_format_physical_width(k);
2438                 if (bits <= 0)
2439                         continue; /* ignore invalid formats */
2440                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2441                         snd_mask_reset(&m, (__force unsigned)k);
2442         }
2443         return snd_mask_refine(mask, &m);
2444 }
2445
2446 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2447                                        struct snd_pcm_hw_rule *rule)
2448 {
2449         struct snd_interval t;
2450         snd_pcm_format_t k;
2451
2452         t.min = UINT_MAX;
2453         t.max = 0;
2454         t.openmin = 0;
2455         t.openmax = 0;
2456         pcm_for_each_format(k) {
2457                 int bits;
2458                 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2459                         continue;
2460                 bits = snd_pcm_format_physical_width(k);
2461                 if (bits <= 0)
2462                         continue; /* ignore invalid formats */
2463                 if (t.min > (unsigned)bits)
2464                         t.min = bits;
2465                 if (t.max < (unsigned)bits)
2466                         t.max = bits;
2467         }
2468         t.integer = 1;
2469         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2470 }
2471
2472 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2473 #error "Change this table"
2474 #endif
2475
2476 static const unsigned int rates[] = {
2477         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2478         48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2479 };
2480
2481 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2482         .count = ARRAY_SIZE(rates),
2483         .list = rates,
2484 };
2485
2486 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2487                                 struct snd_pcm_hw_rule *rule)
2488 {
2489         struct snd_pcm_hardware *hw = rule->private;
2490         return snd_interval_list(hw_param_interval(params, rule->var),
2491                                  snd_pcm_known_rates.count,
2492                                  snd_pcm_known_rates.list, hw->rates);
2493 }
2494
2495 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2496                                             struct snd_pcm_hw_rule *rule)
2497 {
2498         struct snd_interval t;
2499         struct snd_pcm_substream *substream = rule->private;
2500         t.min = 0;
2501         t.max = substream->buffer_bytes_max;
2502         t.openmin = 0;
2503         t.openmax = 0;
2504         t.integer = 1;
2505         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2506 }
2507
2508 static int snd_pcm_hw_rule_subformats(struct snd_pcm_hw_params *params,
2509                                       struct snd_pcm_hw_rule *rule)
2510 {
2511         struct snd_mask *sfmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
2512         struct snd_mask *fmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2513         u32 *subformats = rule->private;
2514         snd_pcm_format_t f;
2515         struct snd_mask m;
2516
2517         snd_mask_none(&m);
2518         /* All PCMs support at least the default STD subformat. */
2519         snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_STD);
2520
2521         pcm_for_each_format(f) {
2522                 if (!snd_mask_test(fmask, (__force unsigned)f))
2523                         continue;
2524
2525                 if (f == SNDRV_PCM_FORMAT_S32_LE && *subformats)
2526                         m.bits[0] |= *subformats;
2527                 else if (snd_pcm_format_linear(f))
2528                         snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
2529         }
2530
2531         return snd_mask_refine(sfmask, &m);
2532 }
2533
2534 static int snd_pcm_hw_constraint_subformats(struct snd_pcm_runtime *runtime,
2535                                            unsigned int cond, u32 *subformats)
2536 {
2537         return snd_pcm_hw_rule_add(runtime, cond, -1,
2538                                    snd_pcm_hw_rule_subformats, (void *)subformats,
2539                                    SNDRV_PCM_HW_PARAM_SUBFORMAT,
2540                                    SNDRV_PCM_HW_PARAM_FORMAT, -1);
2541 }
2542
2543 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2544 {
2545         struct snd_pcm_runtime *runtime = substream->runtime;
2546         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2547         int k, err;
2548
2549         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2550                 snd_mask_any(constrs_mask(constrs, k));
2551         }
2552
2553         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2554                 snd_interval_any(constrs_interval(constrs, k));
2555         }
2556
2557         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2558         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2559         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2560         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2561         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2562
2563         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2564                                    snd_pcm_hw_rule_format, NULL,
2565                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2566         if (err < 0)
2567                 return err;
2568         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2569                                   snd_pcm_hw_rule_sample_bits, NULL,
2570                                   SNDRV_PCM_HW_PARAM_FORMAT,
2571                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2572         if (err < 0)
2573                 return err;
2574         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2575                                   snd_pcm_hw_rule_div, NULL,
2576                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2577         if (err < 0)
2578                 return err;
2579         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2580                                   snd_pcm_hw_rule_mul, NULL,
2581                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2582         if (err < 0)
2583                 return err;
2584         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2585                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2586                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2587         if (err < 0)
2588                 return err;
2589         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2590                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2591                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2592         if (err < 0)
2593                 return err;
2594         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2595                                   snd_pcm_hw_rule_div, NULL,
2596                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2597         if (err < 0)
2598                 return err;
2599         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2600                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2601                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2602         if (err < 0)
2603                 return err;
2604         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2605                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2606                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2607         if (err < 0)
2608                 return err;
2609         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2610                                   snd_pcm_hw_rule_div, NULL,
2611                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2612         if (err < 0)
2613                 return err;
2614         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2615                                   snd_pcm_hw_rule_div, NULL,
2616                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2617         if (err < 0)
2618                 return err;
2619         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2620                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2621                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2622         if (err < 0)
2623                 return err;
2624         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2625                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2626                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2627         if (err < 0)
2628                 return err;
2629         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2630                                   snd_pcm_hw_rule_mul, NULL,
2631                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2632         if (err < 0)
2633                 return err;
2634         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2635                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2636                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2637         if (err < 0)
2638                 return err;
2639         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2640                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2641                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2642         if (err < 0)
2643                 return err;
2644         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2645                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2646                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2647         if (err < 0)
2648                 return err;
2649         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2650                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2651                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2652         if (err < 0)
2653                 return err;
2654         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2655                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2656                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2657         if (err < 0)
2658                 return err;
2659         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2660                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2661                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2662         if (err < 0)
2663                 return err;
2664         return 0;
2665 }
2666
2667 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2668 {
2669         struct snd_pcm_runtime *runtime = substream->runtime;
2670         struct snd_pcm_hardware *hw = &runtime->hw;
2671         int err;
2672         unsigned int mask = 0;
2673
2674         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2675                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2676         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2677                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2678         if (hw_support_mmap(substream)) {
2679                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2680                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2681                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2682                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2683                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2684                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2685         }
2686         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2687         if (err < 0)
2688                 return err;
2689
2690         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2691         if (err < 0)
2692                 return err;
2693
2694         err = snd_pcm_hw_constraint_subformats(runtime, 0, &hw->subformats);
2695         if (err < 0)
2696                 return err;
2697
2698         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2699                                            hw->channels_min, hw->channels_max);
2700         if (err < 0)
2701                 return err;
2702
2703         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2704                                            hw->rate_min, hw->rate_max);
2705         if (err < 0)
2706                 return err;
2707
2708         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2709                                            hw->period_bytes_min, hw->period_bytes_max);
2710         if (err < 0)
2711                 return err;
2712
2713         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2714                                            hw->periods_min, hw->periods_max);
2715         if (err < 0)
2716                 return err;
2717
2718         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2719                                            hw->period_bytes_min, hw->buffer_bytes_max);
2720         if (err < 0)
2721                 return err;
2722
2723         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2724                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2725                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2726         if (err < 0)
2727                 return err;
2728
2729         /* FIXME: remove */
2730         if (runtime->dma_bytes) {
2731                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2732                 if (err < 0)
2733                         return err;
2734         }
2735
2736         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2737                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2738                                           snd_pcm_hw_rule_rate, hw,
2739                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2740                 if (err < 0)
2741                         return err;
2742         }
2743
2744         /* FIXME: this belong to lowlevel */
2745         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2746
2747         return 0;
2748 }
2749
2750 static void pcm_release_private(struct snd_pcm_substream *substream)
2751 {
2752         if (snd_pcm_stream_linked(substream))
2753                 snd_pcm_unlink(substream);
2754 }
2755
2756 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2757 {
2758         substream->ref_count--;
2759         if (substream->ref_count > 0)
2760                 return;
2761
2762         snd_pcm_drop(substream);
2763         if (substream->hw_opened) {
2764                 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2765                         do_hw_free(substream);
2766                 substream->ops->close(substream);
2767                 substream->hw_opened = 0;
2768         }
2769         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2770                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2771         if (substream->pcm_release) {
2772                 substream->pcm_release(substream);
2773                 substream->pcm_release = NULL;
2774         }
2775         snd_pcm_detach_substream(substream);
2776 }
2777 EXPORT_SYMBOL(snd_pcm_release_substream);
2778
2779 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2780                            struct file *file,
2781                            struct snd_pcm_substream **rsubstream)
2782 {
2783         struct snd_pcm_substream *substream;
2784         int err;
2785
2786         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2787         if (err < 0)
2788                 return err;
2789         if (substream->ref_count > 1) {
2790                 *rsubstream = substream;
2791                 return 0;
2792         }
2793
2794         err = snd_pcm_hw_constraints_init(substream);
2795         if (err < 0) {
2796                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2797                 goto error;
2798         }
2799
2800         err = substream->ops->open(substream);
2801         if (err < 0)
2802                 goto error;
2803
2804         substream->hw_opened = 1;
2805
2806         err = snd_pcm_hw_constraints_complete(substream);
2807         if (err < 0) {
2808                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2809                 goto error;
2810         }
2811
2812         /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2813          * the DMA buffer requires it
2814          */
2815         if (substream->managed_buffer_alloc &&
2816             substream->dma_buffer.dev.need_sync)
2817                 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2818
2819         *rsubstream = substream;
2820         return 0;
2821
2822  error:
2823         snd_pcm_release_substream(substream);
2824         return err;
2825 }
2826 EXPORT_SYMBOL(snd_pcm_open_substream);
2827
2828 static int snd_pcm_open_file(struct file *file,
2829                              struct snd_pcm *pcm,
2830                              int stream)
2831 {
2832         struct snd_pcm_file *pcm_file;
2833         struct snd_pcm_substream *substream;
2834         int err;
2835
2836         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2837         if (err < 0)
2838                 return err;
2839
2840         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2841         if (pcm_file == NULL) {
2842                 snd_pcm_release_substream(substream);
2843                 return -ENOMEM;
2844         }
2845         pcm_file->substream = substream;
2846         if (substream->ref_count == 1)
2847                 substream->pcm_release = pcm_release_private;
2848         file->private_data = pcm_file;
2849
2850         return 0;
2851 }
2852
2853 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2854 {
2855         struct snd_pcm *pcm;
2856         int err = nonseekable_open(inode, file);
2857         if (err < 0)
2858                 return err;
2859         pcm = snd_lookup_minor_data(iminor(inode),
2860                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2861         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2862         if (pcm)
2863                 snd_card_unref(pcm->card);
2864         return err;
2865 }
2866
2867 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2868 {
2869         struct snd_pcm *pcm;
2870         int err = nonseekable_open(inode, file);
2871         if (err < 0)
2872                 return err;
2873         pcm = snd_lookup_minor_data(iminor(inode),
2874                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2875         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2876         if (pcm)
2877                 snd_card_unref(pcm->card);
2878         return err;
2879 }
2880
2881 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2882 {
2883         int err;
2884         wait_queue_entry_t wait;
2885
2886         if (pcm == NULL) {
2887                 err = -ENODEV;
2888                 goto __error1;
2889         }
2890         err = snd_card_file_add(pcm->card, file);
2891         if (err < 0)
2892                 goto __error1;
2893         if (!try_module_get(pcm->card->module)) {
2894                 err = -EFAULT;
2895                 goto __error2;
2896         }
2897         init_waitqueue_entry(&wait, current);
2898         add_wait_queue(&pcm->open_wait, &wait);
2899         mutex_lock(&pcm->open_mutex);
2900         while (1) {
2901                 err = snd_pcm_open_file(file, pcm, stream);
2902                 if (err >= 0)
2903                         break;
2904                 if (err == -EAGAIN) {
2905                         if (file->f_flags & O_NONBLOCK) {
2906                                 err = -EBUSY;
2907                                 break;
2908                         }
2909                 } else
2910                         break;
2911                 set_current_state(TASK_INTERRUPTIBLE);
2912                 mutex_unlock(&pcm->open_mutex);
2913                 schedule();
2914                 mutex_lock(&pcm->open_mutex);
2915                 if (pcm->card->shutdown) {
2916                         err = -ENODEV;
2917                         break;
2918                 }
2919                 if (signal_pending(current)) {
2920                         err = -ERESTARTSYS;
2921                         break;
2922                 }
2923         }
2924         remove_wait_queue(&pcm->open_wait, &wait);
2925         mutex_unlock(&pcm->open_mutex);
2926         if (err < 0)
2927                 goto __error;
2928         return err;
2929
2930       __error:
2931         module_put(pcm->card->module);
2932       __error2:
2933         snd_card_file_remove(pcm->card, file);
2934       __error1:
2935         return err;
2936 }
2937
2938 static int snd_pcm_release(struct inode *inode, struct file *file)
2939 {
2940         struct snd_pcm *pcm;
2941         struct snd_pcm_substream *substream;
2942         struct snd_pcm_file *pcm_file;
2943
2944         pcm_file = file->private_data;
2945         substream = pcm_file->substream;
2946         if (snd_BUG_ON(!substream))
2947                 return -ENXIO;
2948         pcm = substream->pcm;
2949
2950         /* block until the device gets woken up as it may touch the hardware */
2951         snd_power_wait(pcm->card);
2952
2953         mutex_lock(&pcm->open_mutex);
2954         snd_pcm_release_substream(substream);
2955         kfree(pcm_file);
2956         mutex_unlock(&pcm->open_mutex);
2957         wake_up(&pcm->open_wait);
2958         module_put(pcm->card->module);
2959         snd_card_file_remove(pcm->card, file);
2960         return 0;
2961 }
2962
2963 /* check and update PCM state; return 0 or a negative error
2964  * call this inside PCM lock
2965  */
2966 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2967 {
2968         switch (substream->runtime->state) {
2969         case SNDRV_PCM_STATE_DRAINING:
2970                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2971                         return -EBADFD;
2972                 fallthrough;
2973         case SNDRV_PCM_STATE_RUNNING:
2974                 return snd_pcm_update_hw_ptr(substream);
2975         case SNDRV_PCM_STATE_PREPARED:
2976         case SNDRV_PCM_STATE_PAUSED:
2977                 return 0;
2978         case SNDRV_PCM_STATE_SUSPENDED:
2979                 return -ESTRPIPE;
2980         case SNDRV_PCM_STATE_XRUN:
2981                 return -EPIPE;
2982         default:
2983                 return -EBADFD;
2984         }
2985 }
2986
2987 /* increase the appl_ptr; returns the processed frames or a negative error */
2988 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2989                                           snd_pcm_uframes_t frames,
2990                                            snd_pcm_sframes_t avail)
2991 {
2992         struct snd_pcm_runtime *runtime = substream->runtime;
2993         snd_pcm_sframes_t appl_ptr;
2994         int ret;
2995
2996         if (avail <= 0)
2997                 return 0;
2998         if (frames > (snd_pcm_uframes_t)avail)
2999                 frames = avail;
3000         appl_ptr = runtime->control->appl_ptr + frames;
3001         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
3002                 appl_ptr -= runtime->boundary;
3003         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
3004         return ret < 0 ? ret : frames;
3005 }
3006
3007 /* decrease the appl_ptr; returns the processed frames or zero for error */
3008 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
3009                                          snd_pcm_uframes_t frames,
3010                                          snd_pcm_sframes_t avail)
3011 {
3012         struct snd_pcm_runtime *runtime = substream->runtime;
3013         snd_pcm_sframes_t appl_ptr;
3014         int ret;
3015
3016         if (avail <= 0)
3017                 return 0;
3018         if (frames > (snd_pcm_uframes_t)avail)
3019                 frames = avail;
3020         appl_ptr = runtime->control->appl_ptr - frames;
3021         if (appl_ptr < 0)
3022                 appl_ptr += runtime->boundary;
3023         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
3024         /* NOTE: we return zero for errors because PulseAudio gets depressed
3025          * upon receiving an error from rewind ioctl and stops processing
3026          * any longer.  Returning zero means that no rewind is done, so
3027          * it's not absolutely wrong to answer like that.
3028          */
3029         return ret < 0 ? 0 : frames;
3030 }
3031
3032 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
3033                                         snd_pcm_uframes_t frames)
3034 {
3035         snd_pcm_sframes_t ret;
3036
3037         if (frames == 0)
3038                 return 0;
3039
3040         snd_pcm_stream_lock_irq(substream);
3041         ret = do_pcm_hwsync(substream);
3042         if (!ret)
3043                 ret = rewind_appl_ptr(substream, frames,
3044                                       snd_pcm_hw_avail(substream));
3045         snd_pcm_stream_unlock_irq(substream);
3046         if (ret >= 0)
3047                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3048         return ret;
3049 }
3050
3051 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
3052                                          snd_pcm_uframes_t frames)
3053 {
3054         snd_pcm_sframes_t ret;
3055
3056         if (frames == 0)
3057                 return 0;
3058
3059         snd_pcm_stream_lock_irq(substream);
3060         ret = do_pcm_hwsync(substream);
3061         if (!ret)
3062                 ret = forward_appl_ptr(substream, frames,
3063                                        snd_pcm_avail(substream));
3064         snd_pcm_stream_unlock_irq(substream);
3065         if (ret >= 0)
3066                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3067         return ret;
3068 }
3069
3070 static int snd_pcm_delay(struct snd_pcm_substream *substream,
3071                          snd_pcm_sframes_t *delay)
3072 {
3073         int err;
3074
3075         snd_pcm_stream_lock_irq(substream);
3076         err = do_pcm_hwsync(substream);
3077         if (delay && !err)
3078                 *delay = snd_pcm_calc_delay(substream);
3079         snd_pcm_stream_unlock_irq(substream);
3080         snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3081
3082         return err;
3083 }
3084
3085 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3086 {
3087         return snd_pcm_delay(substream, NULL);
3088 }
3089
3090 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3091                             struct snd_pcm_sync_ptr __user *_sync_ptr)
3092 {
3093         struct snd_pcm_runtime *runtime = substream->runtime;
3094         struct snd_pcm_sync_ptr sync_ptr;
3095         volatile struct snd_pcm_mmap_status *status;
3096         volatile struct snd_pcm_mmap_control *control;
3097         int err;
3098
3099         memset(&sync_ptr, 0, sizeof(sync_ptr));
3100         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3101                 return -EFAULT;
3102         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3103                 return -EFAULT;
3104         status = runtime->status;
3105         control = runtime->control;
3106         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3107                 err = snd_pcm_hwsync(substream);
3108                 if (err < 0)
3109                         return err;
3110         }
3111         snd_pcm_stream_lock_irq(substream);
3112         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3113                 err = pcm_lib_apply_appl_ptr(substream,
3114                                              sync_ptr.c.control.appl_ptr);
3115                 if (err < 0) {
3116                         snd_pcm_stream_unlock_irq(substream);
3117                         return err;
3118                 }
3119         } else {
3120                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3121         }
3122         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3123                 control->avail_min = sync_ptr.c.control.avail_min;
3124         else
3125                 sync_ptr.c.control.avail_min = control->avail_min;
3126         sync_ptr.s.status.state = status->state;
3127         sync_ptr.s.status.hw_ptr = status->hw_ptr;
3128         sync_ptr.s.status.tstamp = status->tstamp;
3129         sync_ptr.s.status.suspended_state = status->suspended_state;
3130         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3131         snd_pcm_stream_unlock_irq(substream);
3132         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3133                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3134         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3135                 return -EFAULT;
3136         return 0;
3137 }
3138
3139 struct snd_pcm_mmap_status32 {
3140         snd_pcm_state_t state;
3141         s32 pad1;
3142         u32 hw_ptr;
3143         s32 tstamp_sec;
3144         s32 tstamp_nsec;
3145         snd_pcm_state_t suspended_state;
3146         s32 audio_tstamp_sec;
3147         s32 audio_tstamp_nsec;
3148 } __packed;
3149
3150 struct snd_pcm_mmap_control32 {
3151         u32 appl_ptr;
3152         u32 avail_min;
3153 };
3154
3155 struct snd_pcm_sync_ptr32 {
3156         u32 flags;
3157         union {
3158                 struct snd_pcm_mmap_status32 status;
3159                 unsigned char reserved[64];
3160         } s;
3161         union {
3162                 struct snd_pcm_mmap_control32 control;
3163                 unsigned char reserved[64];
3164         } c;
3165 } __packed;
3166
3167 /* recalcuate the boundary within 32bit */
3168 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3169 {
3170         snd_pcm_uframes_t boundary;
3171
3172         if (! runtime->buffer_size)
3173                 return 0;
3174         boundary = runtime->buffer_size;
3175         while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3176                 boundary *= 2;
3177         return boundary;
3178 }
3179
3180 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3181                                          struct snd_pcm_sync_ptr32 __user *src)
3182 {
3183         struct snd_pcm_runtime *runtime = substream->runtime;
3184         volatile struct snd_pcm_mmap_status *status;
3185         volatile struct snd_pcm_mmap_control *control;
3186         u32 sflags;
3187         struct snd_pcm_mmap_control scontrol;
3188         struct snd_pcm_mmap_status sstatus;
3189         snd_pcm_uframes_t boundary;
3190         int err;
3191
3192         if (snd_BUG_ON(!runtime))
3193                 return -EINVAL;
3194
3195         if (get_user(sflags, &src->flags) ||
3196             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3197             get_user(scontrol.avail_min, &src->c.control.avail_min))
3198                 return -EFAULT;
3199         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3200                 err = snd_pcm_hwsync(substream);
3201                 if (err < 0)
3202                         return err;
3203         }
3204         status = runtime->status;
3205         control = runtime->control;
3206         boundary = recalculate_boundary(runtime);
3207         if (! boundary)
3208                 boundary = 0x7fffffff;
3209         snd_pcm_stream_lock_irq(substream);
3210         /* FIXME: we should consider the boundary for the sync from app */
3211         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3212                 err = pcm_lib_apply_appl_ptr(substream,
3213                                 scontrol.appl_ptr);
3214                 if (err < 0) {
3215                         snd_pcm_stream_unlock_irq(substream);
3216                         return err;
3217                 }
3218         } else
3219                 scontrol.appl_ptr = control->appl_ptr % boundary;
3220         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3221                 control->avail_min = scontrol.avail_min;
3222         else
3223                 scontrol.avail_min = control->avail_min;
3224         sstatus.state = status->state;
3225         sstatus.hw_ptr = status->hw_ptr % boundary;
3226         sstatus.tstamp = status->tstamp;
3227         sstatus.suspended_state = status->suspended_state;
3228         sstatus.audio_tstamp = status->audio_tstamp;
3229         snd_pcm_stream_unlock_irq(substream);
3230         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3231                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3232         if (put_user(sstatus.state, &src->s.status.state) ||
3233             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3234             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3235             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3236             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3237             put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3238             put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3239             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3240             put_user(scontrol.avail_min, &src->c.control.avail_min))
3241                 return -EFAULT;
3242
3243         return 0;
3244 }
3245 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3246
3247 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3248 {
3249         struct snd_pcm_runtime *runtime = substream->runtime;
3250         int arg;
3251
3252         if (get_user(arg, _arg))
3253                 return -EFAULT;
3254         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3255                 return -EINVAL;
3256         runtime->tstamp_type = arg;
3257         return 0;
3258 }
3259
3260 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3261                                       struct snd_xferi __user *_xferi)
3262 {
3263         struct snd_xferi xferi;
3264         struct snd_pcm_runtime *runtime = substream->runtime;
3265         snd_pcm_sframes_t result;
3266
3267         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3268                 return -EBADFD;
3269         if (put_user(0, &_xferi->result))
3270                 return -EFAULT;
3271         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3272                 return -EFAULT;
3273         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3274                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3275         else
3276                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3277         if (put_user(result, &_xferi->result))
3278                 return -EFAULT;
3279         return result < 0 ? result : 0;
3280 }
3281
3282 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3283                                       struct snd_xfern __user *_xfern)
3284 {
3285         struct snd_xfern xfern;
3286         struct snd_pcm_runtime *runtime = substream->runtime;
3287         void *bufs;
3288         snd_pcm_sframes_t result;
3289
3290         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3291                 return -EBADFD;
3292         if (runtime->channels > 128)
3293                 return -EINVAL;
3294         if (put_user(0, &_xfern->result))
3295                 return -EFAULT;
3296         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3297                 return -EFAULT;
3298
3299         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3300         if (IS_ERR(bufs))
3301                 return PTR_ERR(bufs);
3302         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3303                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3304         else
3305                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3306         kfree(bufs);
3307         if (put_user(result, &_xfern->result))
3308                 return -EFAULT;
3309         return result < 0 ? result : 0;
3310 }
3311
3312 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3313                                 snd_pcm_uframes_t __user *_frames)
3314 {
3315         snd_pcm_uframes_t frames;
3316         snd_pcm_sframes_t result;
3317
3318         if (get_user(frames, _frames))
3319                 return -EFAULT;
3320         if (put_user(0, _frames))
3321                 return -EFAULT;
3322         result = snd_pcm_rewind(substream, frames);
3323         if (put_user(result, _frames))
3324                 return -EFAULT;
3325         return result < 0 ? result : 0;
3326 }
3327
3328 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3329                                  snd_pcm_uframes_t __user *_frames)
3330 {
3331         snd_pcm_uframes_t frames;
3332         snd_pcm_sframes_t result;
3333
3334         if (get_user(frames, _frames))
3335                 return -EFAULT;
3336         if (put_user(0, _frames))
3337                 return -EFAULT;
3338         result = snd_pcm_forward(substream, frames);
3339         if (put_user(result, _frames))
3340                 return -EFAULT;
3341         return result < 0 ? result : 0;
3342 }
3343
3344 static int snd_pcm_common_ioctl(struct file *file,
3345                                  struct snd_pcm_substream *substream,
3346                                  unsigned int cmd, void __user *arg)
3347 {
3348         struct snd_pcm_file *pcm_file = file->private_data;
3349         int res;
3350
3351         if (PCM_RUNTIME_CHECK(substream))
3352                 return -ENXIO;
3353
3354         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3355                 return -EBADFD;
3356
3357         res = snd_power_wait(substream->pcm->card);
3358         if (res < 0)
3359                 return res;
3360
3361         switch (cmd) {
3362         case SNDRV_PCM_IOCTL_PVERSION:
3363                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3364         case SNDRV_PCM_IOCTL_INFO:
3365                 return snd_pcm_info_user(substream, arg);
3366         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
3367                 return 0;
3368         case SNDRV_PCM_IOCTL_TTSTAMP:
3369                 return snd_pcm_tstamp(substream, arg);
3370         case SNDRV_PCM_IOCTL_USER_PVERSION:
3371                 if (get_user(pcm_file->user_pversion,
3372                              (unsigned int __user *)arg))
3373                         return -EFAULT;
3374                 return 0;
3375         case SNDRV_PCM_IOCTL_HW_REFINE:
3376                 return snd_pcm_hw_refine_user(substream, arg);
3377         case SNDRV_PCM_IOCTL_HW_PARAMS:
3378                 return snd_pcm_hw_params_user(substream, arg);
3379         case SNDRV_PCM_IOCTL_HW_FREE:
3380                 return snd_pcm_hw_free(substream);
3381         case SNDRV_PCM_IOCTL_SW_PARAMS:
3382                 return snd_pcm_sw_params_user(substream, arg);
3383         case SNDRV_PCM_IOCTL_STATUS32:
3384                 return snd_pcm_status_user32(substream, arg, false);
3385         case SNDRV_PCM_IOCTL_STATUS_EXT32:
3386                 return snd_pcm_status_user32(substream, arg, true);
3387         case SNDRV_PCM_IOCTL_STATUS64:
3388                 return snd_pcm_status_user64(substream, arg, false);
3389         case SNDRV_PCM_IOCTL_STATUS_EXT64:
3390                 return snd_pcm_status_user64(substream, arg, true);
3391         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3392                 return snd_pcm_channel_info_user(substream, arg);
3393         case SNDRV_PCM_IOCTL_PREPARE:
3394                 return snd_pcm_prepare(substream, file);
3395         case SNDRV_PCM_IOCTL_RESET:
3396                 return snd_pcm_reset(substream);
3397         case SNDRV_PCM_IOCTL_START:
3398                 return snd_pcm_start_lock_irq(substream);
3399         case SNDRV_PCM_IOCTL_LINK:
3400                 return snd_pcm_link(substream, (int)(unsigned long) arg);
3401         case SNDRV_PCM_IOCTL_UNLINK:
3402                 return snd_pcm_unlink(substream);
3403         case SNDRV_PCM_IOCTL_RESUME:
3404                 return snd_pcm_resume(substream);
3405         case SNDRV_PCM_IOCTL_XRUN:
3406                 return snd_pcm_xrun(substream);
3407         case SNDRV_PCM_IOCTL_HWSYNC:
3408                 return snd_pcm_hwsync(substream);
3409         case SNDRV_PCM_IOCTL_DELAY:
3410         {
3411                 snd_pcm_sframes_t delay = 0;
3412                 snd_pcm_sframes_t __user *res = arg;
3413                 int err;
3414
3415                 err = snd_pcm_delay(substream, &delay);
3416                 if (err)
3417                         return err;
3418                 if (put_user(delay, res))
3419                         return -EFAULT;
3420                 return 0;
3421         }
3422         case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3423                 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3424         case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3425                 return snd_pcm_sync_ptr(substream, arg);
3426 #ifdef CONFIG_SND_SUPPORT_OLD_API
3427         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3428                 return snd_pcm_hw_refine_old_user(substream, arg);
3429         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3430                 return snd_pcm_hw_params_old_user(substream, arg);
3431 #endif
3432         case SNDRV_PCM_IOCTL_DRAIN:
3433                 return snd_pcm_drain(substream, file);
3434         case SNDRV_PCM_IOCTL_DROP:
3435                 return snd_pcm_drop(substream);
3436         case SNDRV_PCM_IOCTL_PAUSE:
3437                 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3438         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3439         case SNDRV_PCM_IOCTL_READI_FRAMES:
3440                 return snd_pcm_xferi_frames_ioctl(substream, arg);
3441         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3442         case SNDRV_PCM_IOCTL_READN_FRAMES:
3443                 return snd_pcm_xfern_frames_ioctl(substream, arg);
3444         case SNDRV_PCM_IOCTL_REWIND:
3445                 return snd_pcm_rewind_ioctl(substream, arg);
3446         case SNDRV_PCM_IOCTL_FORWARD:
3447                 return snd_pcm_forward_ioctl(substream, arg);
3448         }
3449         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3450         return -ENOTTY;
3451 }
3452
3453 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3454                           unsigned long arg)
3455 {
3456         struct snd_pcm_file *pcm_file;
3457
3458         pcm_file = file->private_data;
3459
3460         if (((cmd >> 8) & 0xff) != 'A')
3461                 return -ENOTTY;
3462
3463         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3464                                      (void __user *)arg);
3465 }
3466
3467 /**
3468  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3469  * @substream: PCM substream
3470  * @cmd: IOCTL cmd
3471  * @arg: IOCTL argument
3472  *
3473  * The function is provided primarily for OSS layer and USB gadget drivers,
3474  * and it allows only the limited set of ioctls (hw_params, sw_params,
3475  * prepare, start, drain, drop, forward).
3476  *
3477  * Return: zero if successful, or a negative error code
3478  */
3479 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3480                          unsigned int cmd, void *arg)
3481 {
3482         snd_pcm_uframes_t *frames = arg;
3483         snd_pcm_sframes_t result;
3484
3485         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3486                 return -EBADFD;
3487
3488         switch (cmd) {
3489         case SNDRV_PCM_IOCTL_FORWARD:
3490         {
3491                 /* provided only for OSS; capture-only and no value returned */
3492                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3493                         return -EINVAL;
3494                 result = snd_pcm_forward(substream, *frames);
3495                 return result < 0 ? result : 0;
3496         }
3497         case SNDRV_PCM_IOCTL_HW_PARAMS:
3498                 return snd_pcm_hw_params(substream, arg);
3499         case SNDRV_PCM_IOCTL_SW_PARAMS:
3500                 return snd_pcm_sw_params(substream, arg);
3501         case SNDRV_PCM_IOCTL_PREPARE:
3502                 return snd_pcm_prepare(substream, NULL);
3503         case SNDRV_PCM_IOCTL_START:
3504                 return snd_pcm_start_lock_irq(substream);
3505         case SNDRV_PCM_IOCTL_DRAIN:
3506                 return snd_pcm_drain(substream, NULL);
3507         case SNDRV_PCM_IOCTL_DROP:
3508                 return snd_pcm_drop(substream);
3509         case SNDRV_PCM_IOCTL_DELAY:
3510                 return snd_pcm_delay(substream, frames);
3511         default:
3512                 return -EINVAL;
3513         }
3514 }
3515 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3516
3517 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3518                             loff_t * offset)
3519 {
3520         struct snd_pcm_file *pcm_file;
3521         struct snd_pcm_substream *substream;
3522         struct snd_pcm_runtime *runtime;
3523         snd_pcm_sframes_t result;
3524
3525         pcm_file = file->private_data;
3526         substream = pcm_file->substream;
3527         if (PCM_RUNTIME_CHECK(substream))
3528                 return -ENXIO;
3529         runtime = substream->runtime;
3530         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3531             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3532                 return -EBADFD;
3533         if (!frame_aligned(runtime, count))
3534                 return -EINVAL;
3535         count = bytes_to_frames(runtime, count);
3536         result = snd_pcm_lib_read(substream, buf, count);
3537         if (result > 0)
3538                 result = frames_to_bytes(runtime, result);
3539         return result;
3540 }
3541
3542 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3543                              size_t count, loff_t * offset)
3544 {
3545         struct snd_pcm_file *pcm_file;
3546         struct snd_pcm_substream *substream;
3547         struct snd_pcm_runtime *runtime;
3548         snd_pcm_sframes_t result;
3549
3550         pcm_file = file->private_data;
3551         substream = pcm_file->substream;
3552         if (PCM_RUNTIME_CHECK(substream))
3553                 return -ENXIO;
3554         runtime = substream->runtime;
3555         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3556             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3557                 return -EBADFD;
3558         if (!frame_aligned(runtime, count))
3559                 return -EINVAL;
3560         count = bytes_to_frames(runtime, count);
3561         result = snd_pcm_lib_write(substream, buf, count);
3562         if (result > 0)
3563                 result = frames_to_bytes(runtime, result);
3564         return result;
3565 }
3566
3567 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3568 {
3569         struct snd_pcm_file *pcm_file;
3570         struct snd_pcm_substream *substream;
3571         struct snd_pcm_runtime *runtime;
3572         snd_pcm_sframes_t result;
3573         unsigned long i;
3574         void __user **bufs;
3575         snd_pcm_uframes_t frames;
3576         const struct iovec *iov = iter_iov(to);
3577
3578         pcm_file = iocb->ki_filp->private_data;
3579         substream = pcm_file->substream;
3580         if (PCM_RUNTIME_CHECK(substream))
3581                 return -ENXIO;
3582         runtime = substream->runtime;
3583         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3584             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3585                 return -EBADFD;
3586         if (!user_backed_iter(to))
3587                 return -EINVAL;
3588         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3589                 return -EINVAL;
3590         if (!frame_aligned(runtime, iov->iov_len))
3591                 return -EINVAL;
3592         frames = bytes_to_samples(runtime, iov->iov_len);
3593         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3594         if (bufs == NULL)
3595                 return -ENOMEM;
3596         for (i = 0; i < to->nr_segs; ++i) {
3597                 bufs[i] = iov->iov_base;
3598                 iov++;
3599         }
3600         result = snd_pcm_lib_readv(substream, bufs, frames);
3601         if (result > 0)
3602                 result = frames_to_bytes(runtime, result);
3603         kfree(bufs);
3604         return result;
3605 }
3606
3607 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3608 {
3609         struct snd_pcm_file *pcm_file;
3610         struct snd_pcm_substream *substream;
3611         struct snd_pcm_runtime *runtime;
3612         snd_pcm_sframes_t result;
3613         unsigned long i;
3614         void __user **bufs;
3615         snd_pcm_uframes_t frames;
3616         const struct iovec *iov = iter_iov(from);
3617
3618         pcm_file = iocb->ki_filp->private_data;
3619         substream = pcm_file->substream;
3620         if (PCM_RUNTIME_CHECK(substream))
3621                 return -ENXIO;
3622         runtime = substream->runtime;
3623         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3624             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3625                 return -EBADFD;
3626         if (!user_backed_iter(from))
3627                 return -EINVAL;
3628         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3629             !frame_aligned(runtime, iov->iov_len))
3630                 return -EINVAL;
3631         frames = bytes_to_samples(runtime, iov->iov_len);
3632         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3633         if (bufs == NULL)
3634                 return -ENOMEM;
3635         for (i = 0; i < from->nr_segs; ++i) {
3636                 bufs[i] = iov->iov_base;
3637                 iov++;
3638         }
3639         result = snd_pcm_lib_writev(substream, bufs, frames);
3640         if (result > 0)
3641                 result = frames_to_bytes(runtime, result);
3642         kfree(bufs);
3643         return result;
3644 }
3645
3646 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3647 {
3648         struct snd_pcm_file *pcm_file;
3649         struct snd_pcm_substream *substream;
3650         struct snd_pcm_runtime *runtime;
3651         __poll_t mask, ok;
3652         snd_pcm_uframes_t avail;
3653
3654         pcm_file = file->private_data;
3655
3656         substream = pcm_file->substream;
3657         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3658                 ok = EPOLLOUT | EPOLLWRNORM;
3659         else
3660                 ok = EPOLLIN | EPOLLRDNORM;
3661         if (PCM_RUNTIME_CHECK(substream))
3662                 return ok | EPOLLERR;
3663
3664         runtime = substream->runtime;
3665         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3666                 return ok | EPOLLERR;
3667
3668         poll_wait(file, &runtime->sleep, wait);
3669
3670         mask = 0;
3671         snd_pcm_stream_lock_irq(substream);
3672         avail = snd_pcm_avail(substream);
3673         switch (runtime->state) {
3674         case SNDRV_PCM_STATE_RUNNING:
3675         case SNDRV_PCM_STATE_PREPARED:
3676         case SNDRV_PCM_STATE_PAUSED:
3677                 if (avail >= runtime->control->avail_min)
3678                         mask = ok;
3679                 break;
3680         case SNDRV_PCM_STATE_DRAINING:
3681                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3682                         mask = ok;
3683                         if (!avail)
3684                                 mask |= EPOLLERR;
3685                 }
3686                 break;
3687         default:
3688                 mask = ok | EPOLLERR;
3689                 break;
3690         }
3691         snd_pcm_stream_unlock_irq(substream);
3692         return mask;
3693 }
3694
3695 /*
3696  * mmap support
3697  */
3698
3699 /*
3700  * Only on coherent architectures, we can mmap the status and the control records
3701  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3702  */
3703 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3704 /*
3705  * mmap status record
3706  */
3707 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3708 {
3709         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3710         struct snd_pcm_runtime *runtime;
3711
3712         if (substream == NULL)
3713                 return VM_FAULT_SIGBUS;
3714         runtime = substream->runtime;
3715         vmf->page = virt_to_page(runtime->status);
3716         get_page(vmf->page);
3717         return 0;
3718 }
3719
3720 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3721 {
3722         .fault =        snd_pcm_mmap_status_fault,
3723 };
3724
3725 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3726                                struct vm_area_struct *area)
3727 {
3728         long size;
3729         if (!(area->vm_flags & VM_READ))
3730                 return -EINVAL;
3731         size = area->vm_end - area->vm_start;
3732         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3733                 return -EINVAL;
3734         area->vm_ops = &snd_pcm_vm_ops_status;
3735         area->vm_private_data = substream;
3736         vm_flags_mod(area, VM_DONTEXPAND | VM_DONTDUMP,
3737                      VM_WRITE | VM_MAYWRITE);
3738
3739         return 0;
3740 }
3741
3742 /*
3743  * mmap control record
3744  */
3745 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3746 {
3747         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3748         struct snd_pcm_runtime *runtime;
3749
3750         if (substream == NULL)
3751                 return VM_FAULT_SIGBUS;
3752         runtime = substream->runtime;
3753         vmf->page = virt_to_page(runtime->control);
3754         get_page(vmf->page);
3755         return 0;
3756 }
3757
3758 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3759 {
3760         .fault =        snd_pcm_mmap_control_fault,
3761 };
3762
3763 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3764                                 struct vm_area_struct *area)
3765 {
3766         long size;
3767         if (!(area->vm_flags & VM_READ))
3768                 return -EINVAL;
3769         size = area->vm_end - area->vm_start;
3770         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3771                 return -EINVAL;
3772         area->vm_ops = &snd_pcm_vm_ops_control;
3773         area->vm_private_data = substream;
3774         vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3775         return 0;
3776 }
3777
3778 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3779 {
3780         /* If drivers require the explicit sync (typically for non-coherent
3781          * pages), we have to disable the mmap of status and control data
3782          * to enforce the control via SYNC_PTR ioctl.
3783          */
3784         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3785                 return false;
3786         /* See pcm_control_mmap_allowed() below.
3787          * Since older alsa-lib requires both status and control mmaps to be
3788          * coupled, we have to disable the status mmap for old alsa-lib, too.
3789          */
3790         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3791             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3792                 return false;
3793         return true;
3794 }
3795
3796 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3797 {
3798         if (pcm_file->no_compat_mmap)
3799                 return false;
3800         /* see above */
3801         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3802                 return false;
3803         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3804          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3805          * thus it effectively assures the manual update of appl_ptr.
3806          */
3807         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3808                 return false;
3809         return true;
3810 }
3811
3812 #else /* ! coherent mmap */
3813 /*
3814  * don't support mmap for status and control records.
3815  */
3816 #define pcm_status_mmap_allowed(pcm_file)       false
3817 #define pcm_control_mmap_allowed(pcm_file)      false
3818
3819 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3820                                struct vm_area_struct *area)
3821 {
3822         return -ENXIO;
3823 }
3824 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3825                                 struct vm_area_struct *area)
3826 {
3827         return -ENXIO;
3828 }
3829 #endif /* coherent mmap */
3830
3831 /*
3832  * fault callback for mmapping a RAM page
3833  */
3834 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3835 {
3836         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3837         struct snd_pcm_runtime *runtime;
3838         unsigned long offset;
3839         struct page * page;
3840         size_t dma_bytes;
3841
3842         if (substream == NULL)
3843                 return VM_FAULT_SIGBUS;
3844         runtime = substream->runtime;
3845         offset = vmf->pgoff << PAGE_SHIFT;
3846         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3847         if (offset > dma_bytes - PAGE_SIZE)
3848                 return VM_FAULT_SIGBUS;
3849         if (substream->ops->page)
3850                 page = substream->ops->page(substream, offset);
3851         else if (!snd_pcm_get_dma_buf(substream))
3852                 page = virt_to_page(runtime->dma_area + offset);
3853         else
3854                 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3855         if (!page)
3856                 return VM_FAULT_SIGBUS;
3857         get_page(page);
3858         vmf->page = page;
3859         return 0;
3860 }
3861
3862 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3863         .open =         snd_pcm_mmap_data_open,
3864         .close =        snd_pcm_mmap_data_close,
3865 };
3866
3867 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3868         .open =         snd_pcm_mmap_data_open,
3869         .close =        snd_pcm_mmap_data_close,
3870         .fault =        snd_pcm_mmap_data_fault,
3871 };
3872
3873 /*
3874  * mmap the DMA buffer on RAM
3875  */
3876
3877 /**
3878  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3879  * @substream: PCM substream
3880  * @area: VMA
3881  *
3882  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3883  * this function is invoked implicitly.
3884  *
3885  * Return: zero if successful, or a negative error code
3886  */
3887 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3888                              struct vm_area_struct *area)
3889 {
3890         vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3891         if (!substream->ops->page &&
3892             !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3893                 return 0;
3894         /* mmap with fault handler */
3895         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3896         return 0;
3897 }
3898 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3899
3900 /*
3901  * mmap the DMA buffer on I/O memory area
3902  */
3903 #if SNDRV_PCM_INFO_MMAP_IOMEM
3904 /**
3905  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3906  * @substream: PCM substream
3907  * @area: VMA
3908  *
3909  * When your hardware uses the iomapped pages as the hardware buffer and
3910  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3911  * is supposed to work only on limited architectures.
3912  *
3913  * Return: zero if successful, or a negative error code
3914  */
3915 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3916                            struct vm_area_struct *area)
3917 {
3918         struct snd_pcm_runtime *runtime = substream->runtime;
3919
3920         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3921         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3922 }
3923 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3924 #endif /* SNDRV_PCM_INFO_MMAP */
3925
3926 /*
3927  * mmap DMA buffer
3928  */
3929 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3930                       struct vm_area_struct *area)
3931 {
3932         struct snd_pcm_runtime *runtime;
3933         long size;
3934         unsigned long offset;
3935         size_t dma_bytes;
3936         int err;
3937
3938         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3939                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3940                         return -EINVAL;
3941         } else {
3942                 if (!(area->vm_flags & VM_READ))
3943                         return -EINVAL;
3944         }
3945         runtime = substream->runtime;
3946         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3947                 return -EBADFD;
3948         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3949                 return -ENXIO;
3950         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3951             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3952                 return -EINVAL;
3953         size = area->vm_end - area->vm_start;
3954         offset = area->vm_pgoff << PAGE_SHIFT;
3955         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3956         if ((size_t)size > dma_bytes)
3957                 return -EINVAL;
3958         if (offset > dma_bytes - size)
3959                 return -EINVAL;
3960
3961         area->vm_ops = &snd_pcm_vm_ops_data;
3962         area->vm_private_data = substream;
3963         if (substream->ops->mmap)
3964                 err = substream->ops->mmap(substream, area);
3965         else
3966                 err = snd_pcm_lib_default_mmap(substream, area);
3967         if (!err)
3968                 atomic_inc(&substream->mmap_count);
3969         return err;
3970 }
3971 EXPORT_SYMBOL(snd_pcm_mmap_data);
3972
3973 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3974 {
3975         struct snd_pcm_file * pcm_file;
3976         struct snd_pcm_substream *substream;
3977         unsigned long offset;
3978
3979         pcm_file = file->private_data;
3980         substream = pcm_file->substream;
3981         if (PCM_RUNTIME_CHECK(substream))
3982                 return -ENXIO;
3983         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3984                 return -EBADFD;
3985
3986         offset = area->vm_pgoff << PAGE_SHIFT;
3987         switch (offset) {
3988         case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3989                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3990                         return -ENXIO;
3991                 fallthrough;
3992         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3993                 if (!pcm_status_mmap_allowed(pcm_file))
3994                         return -ENXIO;
3995                 return snd_pcm_mmap_status(substream, file, area);
3996         case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3997                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3998                         return -ENXIO;
3999                 fallthrough;
4000         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4001                 if (!pcm_control_mmap_allowed(pcm_file))
4002                         return -ENXIO;
4003                 return snd_pcm_mmap_control(substream, file, area);
4004         default:
4005                 return snd_pcm_mmap_data(substream, file, area);
4006         }
4007         return 0;
4008 }
4009
4010 static int snd_pcm_fasync(int fd, struct file * file, int on)
4011 {
4012         struct snd_pcm_file * pcm_file;
4013         struct snd_pcm_substream *substream;
4014         struct snd_pcm_runtime *runtime;
4015
4016         pcm_file = file->private_data;
4017         substream = pcm_file->substream;
4018         if (PCM_RUNTIME_CHECK(substream))
4019                 return -ENXIO;
4020         runtime = substream->runtime;
4021         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
4022                 return -EBADFD;
4023         return snd_fasync_helper(fd, file, on, &runtime->fasync);
4024 }
4025
4026 /*
4027  * ioctl32 compat
4028  */
4029 #ifdef CONFIG_COMPAT
4030 #include "pcm_compat.c"
4031 #else
4032 #define snd_pcm_ioctl_compat    NULL
4033 #endif
4034
4035 /*
4036  *  To be removed helpers to keep binary compatibility
4037  */
4038
4039 #ifdef CONFIG_SND_SUPPORT_OLD_API
4040 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
4041 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
4042
4043 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
4044                                                struct snd_pcm_hw_params_old *oparams)
4045 {
4046         unsigned int i;
4047
4048         memset(params, 0, sizeof(*params));
4049         params->flags = oparams->flags;
4050         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4051                 params->masks[i].bits[0] = oparams->masks[i];
4052         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
4053         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
4054         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
4055         params->info = oparams->info;
4056         params->msbits = oparams->msbits;
4057         params->rate_num = oparams->rate_num;
4058         params->rate_den = oparams->rate_den;
4059         params->fifo_size = oparams->fifo_size;
4060 }
4061
4062 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
4063                                              struct snd_pcm_hw_params *params)
4064 {
4065         unsigned int i;
4066
4067         memset(oparams, 0, sizeof(*oparams));
4068         oparams->flags = params->flags;
4069         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4070                 oparams->masks[i] = params->masks[i].bits[0];
4071         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4072         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4073         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4074         oparams->info = params->info;
4075         oparams->msbits = params->msbits;
4076         oparams->rate_num = params->rate_num;
4077         oparams->rate_den = params->rate_den;
4078         oparams->fifo_size = params->fifo_size;
4079 }
4080
4081 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4082                                       struct snd_pcm_hw_params_old __user * _oparams)
4083 {
4084         struct snd_pcm_hw_params *params;
4085         struct snd_pcm_hw_params_old *oparams = NULL;
4086         int err;
4087
4088         params = kmalloc(sizeof(*params), GFP_KERNEL);
4089         if (!params)
4090                 return -ENOMEM;
4091
4092         oparams = memdup_user(_oparams, sizeof(*oparams));
4093         if (IS_ERR(oparams)) {
4094                 err = PTR_ERR(oparams);
4095                 goto out;
4096         }
4097         snd_pcm_hw_convert_from_old_params(params, oparams);
4098         err = snd_pcm_hw_refine(substream, params);
4099         if (err < 0)
4100                 goto out_old;
4101
4102         err = fixup_unreferenced_params(substream, params);
4103         if (err < 0)
4104                 goto out_old;
4105
4106         snd_pcm_hw_convert_to_old_params(oparams, params);
4107         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4108                 err = -EFAULT;
4109 out_old:
4110         kfree(oparams);
4111 out:
4112         kfree(params);
4113         return err;
4114 }
4115
4116 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4117                                       struct snd_pcm_hw_params_old __user * _oparams)
4118 {
4119         struct snd_pcm_hw_params *params;
4120         struct snd_pcm_hw_params_old *oparams = NULL;
4121         int err;
4122
4123         params = kmalloc(sizeof(*params), GFP_KERNEL);
4124         if (!params)
4125                 return -ENOMEM;
4126
4127         oparams = memdup_user(_oparams, sizeof(*oparams));
4128         if (IS_ERR(oparams)) {
4129                 err = PTR_ERR(oparams);
4130                 goto out;
4131         }
4132
4133         snd_pcm_hw_convert_from_old_params(params, oparams);
4134         err = snd_pcm_hw_params(substream, params);
4135         if (err < 0)
4136                 goto out_old;
4137
4138         snd_pcm_hw_convert_to_old_params(oparams, params);
4139         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4140                 err = -EFAULT;
4141 out_old:
4142         kfree(oparams);
4143 out:
4144         kfree(params);
4145         return err;
4146 }
4147 #endif /* CONFIG_SND_SUPPORT_OLD_API */
4148
4149 #ifndef CONFIG_MMU
4150 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4151                                                unsigned long addr,
4152                                                unsigned long len,
4153                                                unsigned long pgoff,
4154                                                unsigned long flags)
4155 {
4156         struct snd_pcm_file *pcm_file = file->private_data;
4157         struct snd_pcm_substream *substream = pcm_file->substream;
4158         struct snd_pcm_runtime *runtime = substream->runtime;
4159         unsigned long offset = pgoff << PAGE_SHIFT;
4160
4161         switch (offset) {
4162         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4163                 return (unsigned long)runtime->status;
4164         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4165                 return (unsigned long)runtime->control;
4166         default:
4167                 return (unsigned long)runtime->dma_area + offset;
4168         }
4169 }
4170 #else
4171 # define snd_pcm_get_unmapped_area NULL
4172 #endif
4173
4174 /*
4175  *  Register section
4176  */
4177
4178 const struct file_operations snd_pcm_f_ops[2] = {
4179         {
4180                 .owner =                THIS_MODULE,
4181                 .write =                snd_pcm_write,
4182                 .write_iter =           snd_pcm_writev,
4183                 .open =                 snd_pcm_playback_open,
4184                 .release =              snd_pcm_release,
4185                 .llseek =               no_llseek,
4186                 .poll =                 snd_pcm_poll,
4187                 .unlocked_ioctl =       snd_pcm_ioctl,
4188                 .compat_ioctl =         snd_pcm_ioctl_compat,
4189                 .mmap =                 snd_pcm_mmap,
4190                 .fasync =               snd_pcm_fasync,
4191                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4192         },
4193         {
4194                 .owner =                THIS_MODULE,
4195                 .read =                 snd_pcm_read,
4196                 .read_iter =            snd_pcm_readv,
4197                 .open =                 snd_pcm_capture_open,
4198                 .release =              snd_pcm_release,
4199                 .llseek =               no_llseek,
4200                 .poll =                 snd_pcm_poll,
4201                 .unlocked_ioctl =       snd_pcm_ioctl,
4202                 .compat_ioctl =         snd_pcm_ioctl_compat,
4203                 .mmap =                 snd_pcm_mmap,
4204                 .fasync =               snd_pcm_fasync,
4205                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4206         }
4207 };