sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/module.h>
  24 #include <linux/file.h>
  25 #include <linux/slab.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/time.h>
  28 #include <linux/pm_qos.h>
  29 #include <linux/io.h>
  30 #include <linux/dma-mapping.h>
  31 #include <sound/core.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/timer.h>
  37 #include <sound/minors.h>
  38 #include <linux/uio.h>
  39
  40 #include "pcm_local.h"
  41
  42 #ifdef CONFIG_SND_DEBUG
  43 #define CREATE_TRACE_POINTS
  44 #include "pcm_param_trace.h"
  45 #else
  46 #define trace_hw_mask_param_enabled()           0
  47 #define trace_hw_interval_param_enabled()       0
  48 #define trace_hw_mask_param(substream, type, index, prev, curr)
  49 #define trace_hw_interval_param(substream, type, index, prev, curr)
  50 #endif
  51
  52 /*
  53  *  Compatibility
  54  */
  55
  56 struct snd_pcm_hw_params_old {
  57         unsigned int flags;
  58         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  59                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  60         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  61                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  62         unsigned int rmask;
  63         unsigned int cmask;
  64         unsigned int info;
  65         unsigned int msbits;
  66         unsigned int rate_num;
  67         unsigned int rate_den;
  68         snd_pcm_uframes_t fifo_size;
  69         unsigned char reserved[64];
  70 };
  71
  72 #ifdef CONFIG_SND_SUPPORT_OLD_API
  73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  75
  76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  77                                       struct snd_pcm_hw_params_old __user * _oparams);
  78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  79                                       struct snd_pcm_hw_params_old __user * _oparams);
  80 #endif
  81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  82
  83 /*
  84  *
  85  */
  86
  87 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
  88 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  89
  90 /* Writer in rwsem may block readers even during its waiting in queue,
  91  * and this may lead to a deadlock when the code path takes read sem
  92  * twice (e.g. one in snd_pcm_action_nonatomic() and another in
  93  * snd_pcm_stream_lock()).  As a (suboptimal) workaround, let writer to
  94  * spin until it gets the lock.
  95  */
  96 static inline void down_write_nonblock(struct rw_semaphore *lock)
  97 {
  98         while (!down_write_trylock(lock))
  99                 cond_resched();
 100 }
 101
 102 /**
 103  * snd_pcm_stream_lock - Lock the PCM stream
 104  * @substream: PCM substream
 105  *
 106  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 107  * flag of the given substream.  This also takes the global link rw lock
 108  * (or rw sem), too, for avoiding the race with linked streams.
 109  */
 110 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 111 {
 112         if (substream->pcm->nonatomic) {
 113                 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
 114                 mutex_lock(&substream->self_group.mutex);
 115         } else {
 116                 read_lock(&snd_pcm_link_rwlock);
 117                 spin_lock(&substream->self_group.lock);
 118         }
 119 }
 120 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
 121
 122 /**
 123  * snd_pcm_stream_lock - Unlock the PCM stream
 124  * @substream: PCM substream
 125  *
 126  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
 127  */
 128 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 129 {
 130         if (substream->pcm->nonatomic) {
 131                 mutex_unlock(&substream->self_group.mutex);
 132                 up_read(&snd_pcm_link_rwsem);
 133         } else {
 134                 spin_unlock(&substream->self_group.lock);
 135                 read_unlock(&snd_pcm_link_rwlock);
 136         }
 137 }
 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
 139
 140 /**
 141  * snd_pcm_stream_lock_irq - Lock the PCM stream
 142  * @substream: PCM substream
 143  *
 144  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
 145  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 146  * as snd_pcm_stream_lock().
 147  */
 148 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 149 {
 150         if (!substream->pcm->nonatomic)
 151                 local_irq_disable();
 152         snd_pcm_stream_lock(substream);
 153 }
 154 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
 155
 156 /**
 157  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 158  * @substream: PCM substream
 159  *
 160  * This is a counter-part of snd_pcm_stream_lock_irq().
 161  */
 162 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 163 {
 164         snd_pcm_stream_unlock(substream);
 165         if (!substream->pcm->nonatomic)
 166                 local_irq_enable();
 167 }
 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
 169
 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
 171 {
 172         unsigned long flags = 0;
 173         if (!substream->pcm->nonatomic)
 174                 local_irq_save(flags);
 175         snd_pcm_stream_lock(substream);
 176         return flags;
 177 }
 178 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
 179
 180 /**
 181  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
 182  * @substream: PCM substream
 183  * @flags: irq flags
 184  *
 185  * This is a counter-part of snd_pcm_stream_lock_irqsave().
 186  */
 187 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 188                                       unsigned long flags)
 189 {
 190         snd_pcm_stream_unlock(substream);
 191         if (!substream->pcm->nonatomic)
 192                 local_irq_restore(flags);
 193 }
 194 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
 195
 196 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
 197 {
 198         struct snd_pcm *pcm = substream->pcm;
 199         struct snd_pcm_str *pstr = substream->pstr;
 200
 201         memset(info, 0, sizeof(*info));
 202         info->card = pcm->card->number;
 203         info->device = pcm->device;
 204         info->stream = substream->stream;
 205         info->subdevice = substream->number;
 206         strlcpy(info->id, pcm->id, sizeof(info->id));
 207         strlcpy(info->name, pcm->name, sizeof(info->name));
 208         info->dev_class = pcm->dev_class;
 209         info->dev_subclass = pcm->dev_subclass;
 210         info->subdevices_count = pstr->substream_count;
 211         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 212         strlcpy(info->subname, substream->name, sizeof(info->subname));
 213
 214         return 0;
 215 }
 216
 217 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 218                       struct snd_pcm_info __user * _info)
 219 {
 220         struct snd_pcm_info *info;
 221         int err;
 222
 223         info = kmalloc(sizeof(*info), GFP_KERNEL);
 224         if (! info)
 225                 return -ENOMEM;
 226         err = snd_pcm_info(substream, info);
 227         if (err >= 0) {
 228                 if (copy_to_user(_info, info, sizeof(*info)))
 229                         err = -EFAULT;
 230         }
 231         kfree(info);
 232         return err;
 233 }
 234
 235 static bool hw_support_mmap(struct snd_pcm_substream *substream)
 236 {
 237         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 238                 return false;
 239         /* architecture supports dma_mmap_coherent()? */
 240 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA)
 241         if (!substream->ops->mmap &&
 242             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
 243                 return false;
 244 #endif
 245         return true;
 246 }
 247
 248 static int constrain_mask_params(struct snd_pcm_substream *substream,
 249                                  struct snd_pcm_hw_params *params)
 250 {
 251         struct snd_pcm_hw_constraints *constrs =
 252                                         &substream->runtime->hw_constraints;
 253         struct snd_mask *m;
 254         unsigned int k;
 255         struct snd_mask old_mask;
 256         int changed;
 257
 258         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 259                 m = hw_param_mask(params, k);
 260                 if (snd_mask_empty(m))
 261                         return -EINVAL;
 262
 263                 /* This parameter is not requested to change by a caller. */
 264                 if (!(params->rmask & (1 << k)))
 265                         continue;
 266
 267                 if (trace_hw_mask_param_enabled())
 268                         old_mask = *m;
 269
 270                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 271                 if (changed < 0)
 272                         return changed;
 273                 if (changed == 0)
 274                         continue;
 275
 276                 /* Set corresponding flag so that the caller gets it. */
 277                 trace_hw_mask_param(substream, k, 0, &old_mask, m);
 278                 params->cmask |= 1 << k;
 279         }
 280
 281         return 0;
 282 }
 283
 284 static int constrain_interval_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_interval *i;
 290         unsigned int k;
 291         struct snd_interval old_interval;
 292         int changed;
 293
 294         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 295                 i = hw_param_interval(params, k);
 296                 if (snd_interval_empty(i))
 297                         return -EINVAL;
 298
 299                 /* This parameter is not requested to change by a caller. */
 300                 if (!(params->rmask & (1 << k)))
 301                         continue;
 302
 303                 if (trace_hw_interval_param_enabled())
 304                         old_interval = *i;
 305
 306                 changed = snd_interval_refine(i, constrs_interval(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_interval_param(substream, k, 0, &old_interval, i);
 314                 params->cmask |= 1 << k;
 315         }
 316
 317         return 0;
 318 }
 319
 320 static int constrain_params_by_rules(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         unsigned int k;
 326         unsigned int *rstamps;
 327         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 328         unsigned int stamp;
 329         struct snd_pcm_hw_rule *r;
 330         unsigned int d;
 331         struct snd_mask old_mask;
 332         struct snd_interval old_interval;
 333         bool again;
 334         int changed, err = 0;
 335
 336         /*
 337          * Each application of rule has own sequence number.
 338          *
 339          * Each member of 'rstamps' array represents the sequence number of
 340          * recent application of corresponding rule.
 341          */
 342         rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
 343         if (!rstamps)
 344                 return -ENOMEM;
 345
 346         /*
 347          * Each member of 'vstamps' array represents the sequence number of
 348          * recent application of rule in which corresponding parameters were
 349          * changed.
 350          *
 351          * In initial state, elements corresponding to parameters requested by
 352          * a caller is 1. For unrequested parameters, corresponding members
 353          * have 0 so that the parameters are never changed anymore.
 354          */
 355         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 356                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 357
 358         /* Due to the above design, actual sequence number starts at 2. */
 359         stamp = 2;
 360 retry:
 361         /* Apply all rules in order. */
 362         again = false;
 363         for (k = 0; k < constrs->rules_num; k++) {
 364                 r = &constrs->rules[k];
 365
 366                 /*
 367                  * Check condition bits of this rule. When the rule has
 368                  * some condition bits, parameter without the bits is
 369                  * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
 370                  * is an example of the condition bits.
 371                  */
 372                 if (r->cond && !(r->cond & params->flags))
 373                         continue;
 374
 375                 /*
 376                  * The 'deps' array includes maximum three dependencies
 377                  * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
 378                  * member of this array is a sentinel and should be
 379                  * negative value.
 380                  *
 381                  * This rule should be processed in this time when dependent
 382                  * parameters were changed at former applications of the other
 383                  * rules.
 384                  */
 385                 for (d = 0; r->deps[d] >= 0; d++) {
 386                         if (vstamps[r->deps[d]] > rstamps[k])
 387                                 break;
 388                 }
 389                 if (r->deps[d] < 0)
 390                         continue;
 391
 392                 if (trace_hw_mask_param_enabled()) {
 393                         if (hw_is_mask(r->var))
 394                                 old_mask = *hw_param_mask(params, r->var);
 395                 }
 396                 if (trace_hw_interval_param_enabled()) {
 397                         if (hw_is_interval(r->var))
 398                                 old_interval = *hw_param_interval(params, r->var);
 399                 }
 400
 401                 changed = r->func(params, r);
 402                 if (changed < 0) {
 403                         err = changed;
 404                         goto out;
 405                 }
 406
 407                 /*
 408                  * When the parameter is changed, notify it to the caller
 409                  * by corresponding returned bit, then preparing for next
 410                  * iteration.
 411                  */
 412                 if (changed && r->var >= 0) {
 413                         if (hw_is_mask(r->var)) {
 414                                 trace_hw_mask_param(substream, r->var,
 415                                         k + 1, &old_mask,
 416                                         hw_param_mask(params, r->var));
 417                         }
 418                         if (hw_is_interval(r->var)) {
 419                                 trace_hw_interval_param(substream, r->var,
 420                                         k + 1, &old_interval,
 421                                         hw_param_interval(params, r->var));
 422                         }
 423
 424                         params->cmask |= (1 << r->var);
 425                         vstamps[r->var] = stamp;
 426                         again = true;
 427                 }
 428
 429                 rstamps[k] = stamp++;
 430         }
 431
 432         /* Iterate to evaluate all rules till no parameters are changed. */
 433         if (again)
 434                 goto retry;
 435
 436  out:
 437         kfree(rstamps);
 438         return err;
 439 }
 440
 441 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
 442                                      struct snd_pcm_hw_params *params)
 443 {
 444         const struct snd_interval *i;
 445         const struct snd_mask *m;
 446         int err;
 447
 448         if (!params->msbits) {
 449                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 450                 if (snd_interval_single(i))
 451                         params->msbits = snd_interval_value(i);
 452         }
 453
 454         if (!params->rate_den) {
 455                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 456                 if (snd_interval_single(i)) {
 457                         params->rate_num = snd_interval_value(i);
 458                         params->rate_den = 1;
 459                 }
 460         }
 461
 462         if (!params->fifo_size) {
 463                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 464                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 465                 if (snd_mask_single(m) && snd_interval_single(i)) {
 466                         err = substream->ops->ioctl(substream,
 467                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 468                         if (err < 0)
 469                                 return err;
 470                 }
 471         }
 472
 473         if (!params->info) {
 474                 params->info = substream->runtime->hw.info;
 475                 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
 476                                   SNDRV_PCM_INFO_DRAIN_TRIGGER);
 477                 if (!hw_support_mmap(substream))
 478                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
 479                                           SNDRV_PCM_INFO_MMAP_VALID);
 480         }
 481
 482         return 0;
 483 }
 484
 485 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 486                       struct snd_pcm_hw_params *params)
 487 {
 488         int err;
 489
 490         params->info = 0;
 491         params->fifo_size = 0;
 492         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 493                 params->msbits = 0;
 494         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 495                 params->rate_num = 0;
 496                 params->rate_den = 0;
 497         }
 498
 499         err = constrain_mask_params(substream, params);
 500         if (err < 0)
 501                 return err;
 502
 503         err = constrain_interval_params(substream, params);
 504         if (err < 0)
 505                 return err;
 506
 507         err = constrain_params_by_rules(substream, params);
 508         if (err < 0)
 509                 return err;
 510
 511         params->rmask = 0;
 512
 513         return 0;
 514 }
 515 EXPORT_SYMBOL(snd_pcm_hw_refine);
 516
 517 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 518                                   struct snd_pcm_hw_params __user * _params)
 519 {
 520         struct snd_pcm_hw_params *params;
 521         int err;
 522
 523         params = memdup_user(_params, sizeof(*params));
 524         if (IS_ERR(params))
 525                 return PTR_ERR(params);
 526
 527         err = snd_pcm_hw_refine(substream, params);
 528         if (err < 0)
 529                 goto end;
 530
 531         err = fixup_unreferenced_params(substream, params);
 532         if (err < 0)
 533                 goto end;
 534
 535         if (copy_to_user(_params, params, sizeof(*params)))
 536                 err = -EFAULT;
 537 end:
 538         kfree(params);
 539         return err;
 540 }
 541
 542 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 543 {
 544         int usecs;
 545
 546         if (! runtime->rate)
 547                 return -1; /* invalid */
 548
 549         /* take 75% of period time as the deadline */
 550         usecs = (750000 / runtime->rate) * runtime->period_size;
 551         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 552                 runtime->rate;
 553
 554         return usecs;
 555 }
 556
 557 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
 558 {
 559         snd_pcm_stream_lock_irq(substream);
 560         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
 561                 substream->runtime->status->state = state;
 562         snd_pcm_stream_unlock_irq(substream);
 563 }
 564
 565 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
 566                                         int event)
 567 {
 568 #ifdef CONFIG_SND_PCM_TIMER
 569         if (substream->timer)
 570                 snd_timer_notify(substream->timer, event,
 571                                         &substream->runtime->trigger_tstamp);
 572 #endif
 573 }
 574
 575 /**
 576  * snd_pcm_hw_param_choose - choose a configuration defined by @params
 577  * @pcm: PCM instance
 578  * @params: the hw_params instance
 579  *
 580  * Choose one configuration from configuration space defined by @params.
 581  * The configuration chosen is that obtained fixing in this order:
 582  * first access, first format, first subformat, min channels,
 583  * min rate, min period time, max buffer size, min tick time
 584  *
 585  * Return: Zero if successful, or a negative error code on failure.
 586  */
 587 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
 588                                     struct snd_pcm_hw_params *params)
 589 {
 590         static const int vars[] = {
 591                 SNDRV_PCM_HW_PARAM_ACCESS,
 592                 SNDRV_PCM_HW_PARAM_FORMAT,
 593                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
 594                 SNDRV_PCM_HW_PARAM_CHANNELS,
 595                 SNDRV_PCM_HW_PARAM_RATE,
 596                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 597                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 598                 SNDRV_PCM_HW_PARAM_TICK_TIME,
 599                 -1
 600         };
 601         const int *v;
 602         struct snd_mask old_mask;
 603         struct snd_interval old_interval;
 604         int changed;
 605
 606         for (v = vars; *v != -1; v++) {
 607                 /* Keep old parameter to trace. */
 608                 if (trace_hw_mask_param_enabled()) {
 609                         if (hw_is_mask(*v))
 610                                 old_mask = *hw_param_mask(params, *v);
 611                 }
 612                 if (trace_hw_interval_param_enabled()) {
 613                         if (hw_is_interval(*v))
 614                                 old_interval = *hw_param_interval(params, *v);
 615                 }
 616                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
 617                         changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
 618                 else
 619                         changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
 620                 if (changed < 0)
 621                         return changed;
 622                 if (changed == 0)
 623                         continue;
 624
 625                 /* Trace the changed parameter. */
 626                 if (hw_is_mask(*v)) {
 627                         trace_hw_mask_param(pcm, *v, 0, &old_mask,
 628                                             hw_param_mask(params, *v));
 629                 }
 630                 if (hw_is_interval(*v)) {
 631                         trace_hw_interval_param(pcm, *v, 0, &old_interval,
 632                                                 hw_param_interval(params, *v));
 633                 }
 634         }
 635
 636         return 0;
 637 }
 638
 639 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 640                              struct snd_pcm_hw_params *params)
 641 {
 642         struct snd_pcm_runtime *runtime;
 643         int err, usecs;
 644         unsigned int bits;
 645         snd_pcm_uframes_t frames;
 646
 647         if (PCM_RUNTIME_CHECK(substream))
 648                 return -ENXIO;
 649         runtime = substream->runtime;
 650         snd_pcm_stream_lock_irq(substream);
 651         switch (runtime->status->state) {
 652         case SNDRV_PCM_STATE_OPEN:
 653         case SNDRV_PCM_STATE_SETUP:
 654         case SNDRV_PCM_STATE_PREPARED:
 655                 break;
 656         default:
 657                 snd_pcm_stream_unlock_irq(substream);
 658                 return -EBADFD;
 659         }
 660         snd_pcm_stream_unlock_irq(substream);
 661 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 662         if (!substream->oss.oss)
 663 #endif
 664                 if (atomic_read(&substream->mmap_count))
 665                         return -EBADFD;
 666
 667         params->rmask = ~0U;
 668         err = snd_pcm_hw_refine(substream, params);
 669         if (err < 0)
 670                 goto _error;
 671
 672         err = snd_pcm_hw_params_choose(substream, params);
 673         if (err < 0)
 674                 goto _error;
 675
 676         err = fixup_unreferenced_params(substream, params);
 677         if (err < 0)
 678                 goto _error;
 679
 680         if (substream->ops->hw_params != NULL) {
 681                 err = substream->ops->hw_params(substream, params);
 682                 if (err < 0)
 683                         goto _error;
 684         }
 685
 686         runtime->access = params_access(params);
 687         runtime->format = params_format(params);
 688         runtime->subformat = params_subformat(params);
 689         runtime->channels = params_channels(params);
 690         runtime->rate = params_rate(params);
 691         runtime->period_size = params_period_size(params);
 692         runtime->periods = params_periods(params);
 693         runtime->buffer_size = params_buffer_size(params);
 694         runtime->info = params->info;
 695         runtime->rate_num = params->rate_num;
 696         runtime->rate_den = params->rate_den;
 697         runtime->no_period_wakeup =
 698                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 699                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 700
 701         bits = snd_pcm_format_physical_width(runtime->format);
 702         runtime->sample_bits = bits;
 703         bits *= runtime->channels;
 704         runtime->frame_bits = bits;
 705         frames = 1;
 706         while (bits % 8 != 0) {
 707                 bits *= 2;
 708                 frames *= 2;
 709         }
 710         runtime->byte_align = bits / 8;
 711         runtime->min_align = frames;
 712
 713         /* Default sw params */
 714         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 715         runtime->period_step = 1;
 716         runtime->control->avail_min = runtime->period_size;
 717         runtime->start_threshold = 1;
 718         runtime->stop_threshold = runtime->buffer_size;
 719         runtime->silence_threshold = 0;
 720         runtime->silence_size = 0;
 721         runtime->boundary = runtime->buffer_size;
 722         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 723                 runtime->boundary *= 2;
 724
 725         snd_pcm_timer_resolution_change(substream);
 726         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 727
 728         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 729                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 730         if ((usecs = period_to_usecs(runtime)) >= 0)
 731                 pm_qos_add_request(&substream->latency_pm_qos_req,
 732                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 733         return 0;
 734  _error:
 735         /* hardware might be unusable from this time,
 736            so we force application to retry to set
 737            the correct hardware parameter settings */
 738         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 739         if (substream->ops->hw_free != NULL)
 740                 substream->ops->hw_free(substream);
 741         return err;
 742 }
 743
 744 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 745                                   struct snd_pcm_hw_params __user * _params)
 746 {
 747         struct snd_pcm_hw_params *params;
 748         int err;
 749
 750         params = memdup_user(_params, sizeof(*params));
 751         if (IS_ERR(params))
 752                 return PTR_ERR(params);
 753
 754         err = snd_pcm_hw_params(substream, params);
 755         if (err < 0)
 756                 goto end;
 757
 758         if (copy_to_user(_params, params, sizeof(*params)))
 759                 err = -EFAULT;
 760 end:
 761         kfree(params);
 762         return err;
 763 }
 764
 765 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 766 {
 767         struct snd_pcm_runtime *runtime;
 768         int result = 0;
 769
 770         if (PCM_RUNTIME_CHECK(substream))
 771                 return -ENXIO;
 772         runtime = substream->runtime;
 773         snd_pcm_stream_lock_irq(substream);
 774         switch (runtime->status->state) {
 775         case SNDRV_PCM_STATE_SETUP:
 776         case SNDRV_PCM_STATE_PREPARED:
 777                 break;
 778         default:
 779                 snd_pcm_stream_unlock_irq(substream);
 780                 return -EBADFD;
 781         }
 782         snd_pcm_stream_unlock_irq(substream);
 783         if (atomic_read(&substream->mmap_count))
 784                 return -EBADFD;
 785         if (substream->ops->hw_free)
 786                 result = substream->ops->hw_free(substream);
 787         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 788         pm_qos_remove_request(&substream->latency_pm_qos_req);
 789         return result;
 790 }
 791
 792 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 793                              struct snd_pcm_sw_params *params)
 794 {
 795         struct snd_pcm_runtime *runtime;
 796         int err;
 797
 798         if (PCM_RUNTIME_CHECK(substream))
 799                 return -ENXIO;
 800         runtime = substream->runtime;
 801         snd_pcm_stream_lock_irq(substream);
 802         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 803                 snd_pcm_stream_unlock_irq(substream);
 804                 return -EBADFD;
 805         }
 806         snd_pcm_stream_unlock_irq(substream);
 807
 808         if (params->tstamp_mode < 0 ||
 809             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 810                 return -EINVAL;
 811         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 812             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 813                 return -EINVAL;
 814         if (params->avail_min == 0)
 815                 return -EINVAL;
 816         if (params->silence_size >= runtime->boundary) {
 817                 if (params->silence_threshold != 0)
 818                         return -EINVAL;
 819         } else {
 820                 if (params->silence_size > params->silence_threshold)
 821                         return -EINVAL;
 822                 if (params->silence_threshold > runtime->buffer_size)
 823                         return -EINVAL;
 824         }
 825         err = 0;
 826         snd_pcm_stream_lock_irq(substream);
 827         runtime->tstamp_mode = params->tstamp_mode;
 828         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 829                 runtime->tstamp_type = params->tstamp_type;
 830         runtime->period_step = params->period_step;
 831         runtime->control->avail_min = params->avail_min;
 832         runtime->start_threshold = params->start_threshold;
 833         runtime->stop_threshold = params->stop_threshold;
 834         runtime->silence_threshold = params->silence_threshold;
 835         runtime->silence_size = params->silence_size;
 836         params->boundary = runtime->boundary;
 837         if (snd_pcm_running(substream)) {
 838                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 839                     runtime->silence_size > 0)
 840                         snd_pcm_playback_silence(substream, ULONG_MAX);
 841                 err = snd_pcm_update_state(substream, runtime);
 842         }
 843         snd_pcm_stream_unlock_irq(substream);
 844         return err;
 845 }
 846
 847 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 848                                   struct snd_pcm_sw_params __user * _params)
 849 {
 850         struct snd_pcm_sw_params params;
 851         int err;
 852         if (copy_from_user(&params, _params, sizeof(params)))
 853                 return -EFAULT;
 854         err = snd_pcm_sw_params(substream, &params);
 855         if (copy_to_user(_params, &params, sizeof(params)))
 856                 return -EFAULT;
 857         return err;
 858 }
 859
 860 int snd_pcm_status(struct snd_pcm_substream *substream,
 861                    struct snd_pcm_status *status)
 862 {
 863         struct snd_pcm_runtime *runtime = substream->runtime;
 864
 865         snd_pcm_stream_lock_irq(substream);
 866
 867         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
 868                                         &runtime->audio_tstamp_config);
 869
 870         /* backwards compatible behavior */
 871         if (runtime->audio_tstamp_config.type_requested ==
 872                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
 873                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
 874                         runtime->audio_tstamp_config.type_requested =
 875                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
 876                 else
 877                         runtime->audio_tstamp_config.type_requested =
 878                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
 879                 runtime->audio_tstamp_report.valid = 0;
 880         } else
 881                 runtime->audio_tstamp_report.valid = 1;
 882
 883         status->state = runtime->status->state;
 884         status->suspended_state = runtime->status->suspended_state;
 885         if (status->state == SNDRV_PCM_STATE_OPEN)
 886                 goto _end;
 887         status->trigger_tstamp = runtime->trigger_tstamp;
 888         if (snd_pcm_running(substream)) {
 889                 snd_pcm_update_hw_ptr(substream);
 890                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 891                         status->tstamp = runtime->status->tstamp;
 892                         status->driver_tstamp = runtime->driver_tstamp;
 893                         status->audio_tstamp =
 894                                 runtime->status->audio_tstamp;
 895                         if (runtime->audio_tstamp_report.valid == 1)
 896                                 /* backwards compatibility, no report provided in COMPAT mode */
 897                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
 898                                                                 &status->audio_tstamp_accuracy,
 899                                                                 &runtime->audio_tstamp_report);
 900
 901                         goto _tstamp_end;
 902                 }
 903         } else {
 904                 /* get tstamp only in fallback mode and only if enabled */
 905                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 906                         snd_pcm_gettime(runtime, &status->tstamp);
 907         }
 908  _tstamp_end:
 909         status->appl_ptr = runtime->control->appl_ptr;
 910         status->hw_ptr = runtime->status->hw_ptr;
 911         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 912                 status->avail = snd_pcm_playback_avail(runtime);
 913                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 914                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 915                         status->delay = runtime->buffer_size - status->avail;
 916                         status->delay += runtime->delay;
 917                 } else
 918                         status->delay = 0;
 919         } else {
 920                 status->avail = snd_pcm_capture_avail(runtime);
 921                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 922                         status->delay = status->avail + runtime->delay;
 923                 else
 924                         status->delay = 0;
 925         }
 926         status->avail_max = runtime->avail_max;
 927         status->overrange = runtime->overrange;
 928         runtime->avail_max = 0;
 929         runtime->overrange = 0;
 930  _end:
 931         snd_pcm_stream_unlock_irq(substream);
 932         return 0;
 933 }
 934
 935 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 936                                struct snd_pcm_status __user * _status,
 937                                bool ext)
 938 {
 939         struct snd_pcm_status status;
 940         int res;
 941
 942         memset(&status, 0, sizeof(status));
 943         /*
 944          * with extension, parameters are read/write,
 945          * get audio_tstamp_data from user,
 946          * ignore rest of status structure
 947          */
 948         if (ext && get_user(status.audio_tstamp_data,
 949                                 (u32 __user *)(&_status->audio_tstamp_data)))
 950                 return -EFAULT;
 951         res = snd_pcm_status(substream, &status);
 952         if (res < 0)
 953                 return res;
 954         if (copy_to_user(_status, &status, sizeof(status)))
 955                 return -EFAULT;
 956         return 0;
 957 }
 958
 959 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 960                                 struct snd_pcm_channel_info * info)
 961 {
 962         struct snd_pcm_runtime *runtime;
 963         unsigned int channel;
 964
 965         channel = info->channel;
 966         runtime = substream->runtime;
 967         snd_pcm_stream_lock_irq(substream);
 968         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 969                 snd_pcm_stream_unlock_irq(substream);
 970                 return -EBADFD;
 971         }
 972         snd_pcm_stream_unlock_irq(substream);
 973         if (channel >= runtime->channels)
 974                 return -EINVAL;
 975         memset(info, 0, sizeof(*info));
 976         info->channel = channel;
 977         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 978 }
 979
 980 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 981                                      struct snd_pcm_channel_info __user * _info)
 982 {
 983         struct snd_pcm_channel_info info;
 984         int res;
 985
 986         if (copy_from_user(&info, _info, sizeof(info)))
 987                 return -EFAULT;
 988         res = snd_pcm_channel_info(substream, &info);
 989         if (res < 0)
 990                 return res;
 991         if (copy_to_user(_info, &info, sizeof(info)))
 992                 return -EFAULT;
 993         return 0;
 994 }
 995
 996 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 997 {
 998         struct snd_pcm_runtime *runtime = substream->runtime;
 999         if (runtime->trigger_master == NULL)
1000                 return;
1001         if (runtime->trigger_master == substream) {
1002                 if (!runtime->trigger_tstamp_latched)
1003                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1004         } else {
1005                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1006                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1007         }
1008         runtime->trigger_master = NULL;
1009 }
1010
1011 struct action_ops {
1012         int (*pre_action)(struct snd_pcm_substream *substream, int state);
1013         int (*do_action)(struct snd_pcm_substream *substream, int state);
1014         void (*undo_action)(struct snd_pcm_substream *substream, int state);
1015         void (*post_action)(struct snd_pcm_substream *substream, int state);
1016 };
1017
1018 /*
1019  *  this functions is core for handling of linked stream
1020  *  Note: the stream state might be changed also on failure
1021  *  Note2: call with calling stream lock + link lock
1022  */
1023 static int snd_pcm_action_group(const struct action_ops *ops,
1024                                 struct snd_pcm_substream *substream,
1025                                 int state, int do_lock)
1026 {
1027         struct snd_pcm_substream *s = NULL;
1028         struct snd_pcm_substream *s1;
1029         int res = 0, depth = 1;
1030
1031         snd_pcm_group_for_each_entry(s, substream) {
1032                 if (do_lock && s != substream) {
1033                         if (s->pcm->nonatomic)
1034                                 mutex_lock_nested(&s->self_group.mutex, depth);
1035                         else
1036                                 spin_lock_nested(&s->self_group.lock, depth);
1037                         depth++;
1038                 }
1039                 res = ops->pre_action(s, state);
1040                 if (res < 0)
1041                         goto _unlock;
1042         }
1043         snd_pcm_group_for_each_entry(s, substream) {
1044                 res = ops->do_action(s, state);
1045                 if (res < 0) {
1046                         if (ops->undo_action) {
1047                                 snd_pcm_group_for_each_entry(s1, substream) {
1048                                         if (s1 == s) /* failed stream */
1049                                                 break;
1050                                         ops->undo_action(s1, state);
1051                                 }
1052                         }
1053                         s = NULL; /* unlock all */
1054                         goto _unlock;
1055                 }
1056         }
1057         snd_pcm_group_for_each_entry(s, substream) {
1058                 ops->post_action(s, state);
1059         }
1060  _unlock:
1061         if (do_lock) {
1062                 /* unlock streams */
1063                 snd_pcm_group_for_each_entry(s1, substream) {
1064                         if (s1 != substream) {
1065                                 if (s1->pcm->nonatomic)
1066                                         mutex_unlock(&s1->self_group.mutex);
1067                                 else
1068                                         spin_unlock(&s1->self_group.lock);
1069                         }
1070                         if (s1 == s)    /* end */
1071                                 break;
1072                 }
1073         }
1074         return res;
1075 }
1076
1077 /*
1078  *  Note: call with stream lock
1079  */
1080 static int snd_pcm_action_single(const struct action_ops *ops,
1081                                  struct snd_pcm_substream *substream,
1082                                  int state)
1083 {
1084         int res;
1085
1086         res = ops->pre_action(substream, state);
1087         if (res < 0)
1088                 return res;
1089         res = ops->do_action(substream, state);
1090         if (res == 0)
1091                 ops->post_action(substream, state);
1092         else if (ops->undo_action)
1093                 ops->undo_action(substream, state);
1094         return res;
1095 }
1096
1097 /*
1098  *  Note: call with stream lock
1099  */
1100 static int snd_pcm_action(const struct action_ops *ops,
1101                           struct snd_pcm_substream *substream,
1102                           int state)
1103 {
1104         int res;
1105
1106         if (!snd_pcm_stream_linked(substream))
1107                 return snd_pcm_action_single(ops, substream, state);
1108
1109         if (substream->pcm->nonatomic) {
1110                 if (!mutex_trylock(&substream->group->mutex)) {
1111                         mutex_unlock(&substream->self_group.mutex);
1112                         mutex_lock(&substream->group->mutex);
1113                         mutex_lock(&substream->self_group.mutex);
1114                 }
1115                 res = snd_pcm_action_group(ops, substream, state, 1);
1116                 mutex_unlock(&substream->group->mutex);
1117         } else {
1118                 if (!spin_trylock(&substream->group->lock)) {
1119                         spin_unlock(&substream->self_group.lock);
1120                         spin_lock(&substream->group->lock);
1121                         spin_lock(&substream->self_group.lock);
1122                 }
1123                 res = snd_pcm_action_group(ops, substream, state, 1);
1124                 spin_unlock(&substream->group->lock);
1125         }
1126         return res;
1127 }
1128
1129 /*
1130  *  Note: don't use any locks before
1131  */
1132 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1133                                    struct snd_pcm_substream *substream,
1134                                    int state)
1135 {
1136         int res;
1137
1138         snd_pcm_stream_lock_irq(substream);
1139         res = snd_pcm_action(ops, substream, state);
1140         snd_pcm_stream_unlock_irq(substream);
1141         return res;
1142 }
1143
1144 /*
1145  */
1146 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1147                                     struct snd_pcm_substream *substream,
1148                                     int state)
1149 {
1150         int res;
1151
1152         down_read(&snd_pcm_link_rwsem);
1153         if (snd_pcm_stream_linked(substream))
1154                 res = snd_pcm_action_group(ops, substream, state, 0);
1155         else
1156                 res = snd_pcm_action_single(ops, substream, state);
1157         up_read(&snd_pcm_link_rwsem);
1158         return res;
1159 }
1160
1161 /*
1162  * start callbacks
1163  */
1164 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1165 {
1166         struct snd_pcm_runtime *runtime = substream->runtime;
1167         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1168                 return -EBADFD;
1169         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1170             !snd_pcm_playback_data(substream))
1171                 return -EPIPE;
1172         runtime->trigger_tstamp_latched = false;
1173         runtime->trigger_master = substream;
1174         return 0;
1175 }
1176
1177 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1178 {
1179         if (substream->runtime->trigger_master != substream)
1180                 return 0;
1181         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1182 }
1183
1184 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1185 {
1186         if (substream->runtime->trigger_master == substream)
1187                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1188 }
1189
1190 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1191 {
1192         struct snd_pcm_runtime *runtime = substream->runtime;
1193         snd_pcm_trigger_tstamp(substream);
1194         runtime->hw_ptr_jiffies = jiffies;
1195         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1196                                                             runtime->rate;
1197         runtime->status->state = state;
1198         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1199             runtime->silence_size > 0)
1200                 snd_pcm_playback_silence(substream, ULONG_MAX);
1201         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1202 }
1203
1204 static const struct action_ops snd_pcm_action_start = {
1205         .pre_action = snd_pcm_pre_start,
1206         .do_action = snd_pcm_do_start,
1207         .undo_action = snd_pcm_undo_start,
1208         .post_action = snd_pcm_post_start
1209 };
1210
1211 /**
1212  * snd_pcm_start - start all linked streams
1213  * @substream: the PCM substream instance
1214  *
1215  * Return: Zero if successful, or a negative error code.
1216  * The stream lock must be acquired before calling this function.
1217  */
1218 int snd_pcm_start(struct snd_pcm_substream *substream)
1219 {
1220         return snd_pcm_action(&snd_pcm_action_start, substream,
1221                               SNDRV_PCM_STATE_RUNNING);
1222 }
1223
1224 /* take the stream lock and start the streams */
1225 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1226 {
1227         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1228                                        SNDRV_PCM_STATE_RUNNING);
1229 }
1230
1231 /*
1232  * stop callbacks
1233  */
1234 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1235 {
1236         struct snd_pcm_runtime *runtime = substream->runtime;
1237         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1238                 return -EBADFD;
1239         runtime->trigger_master = substream;
1240         return 0;
1241 }
1242
1243 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1244 {
1245         if (substream->runtime->trigger_master == substream &&
1246             snd_pcm_running(substream))
1247                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1248         return 0; /* unconditonally stop all substreams */
1249 }
1250
1251 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1252 {
1253         struct snd_pcm_runtime *runtime = substream->runtime;
1254         if (runtime->status->state != state) {
1255                 snd_pcm_trigger_tstamp(substream);
1256                 runtime->status->state = state;
1257                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1258         }
1259         wake_up(&runtime->sleep);
1260         wake_up(&runtime->tsleep);
1261 }
1262
1263 static const struct action_ops snd_pcm_action_stop = {
1264         .pre_action = snd_pcm_pre_stop,
1265         .do_action = snd_pcm_do_stop,
1266         .post_action = snd_pcm_post_stop
1267 };
1268
1269 /**
1270  * snd_pcm_stop - try to stop all running streams in the substream group
1271  * @substream: the PCM substream instance
1272  * @state: PCM state after stopping the stream
1273  *
1274  * The state of each stream is then changed to the given state unconditionally.
1275  *
1276  * Return: Zero if successful, or a negative error code.
1277  */
1278 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1279 {
1280         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1281 }
1282 EXPORT_SYMBOL(snd_pcm_stop);
1283
1284 /**
1285  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1286  * @substream: the PCM substream
1287  *
1288  * After stopping, the state is changed to SETUP.
1289  * Unlike snd_pcm_stop(), this affects only the given stream.
1290  *
1291  * Return: Zero if succesful, or a negative error code.
1292  */
1293 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1294 {
1295         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1296                                      SNDRV_PCM_STATE_SETUP);
1297 }
1298
1299 /**
1300  * snd_pcm_stop_xrun - stop the running streams as XRUN
1301  * @substream: the PCM substream instance
1302  *
1303  * This stops the given running substream (and all linked substreams) as XRUN.
1304  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1305  *
1306  * Return: Zero if successful, or a negative error code.
1307  */
1308 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1309 {
1310         unsigned long flags;
1311         int ret = 0;
1312
1313         snd_pcm_stream_lock_irqsave(substream, flags);
1314         if (snd_pcm_running(substream))
1315                 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1316         snd_pcm_stream_unlock_irqrestore(substream, flags);
1317         return ret;
1318 }
1319 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1320
1321 /*
1322  * pause callbacks
1323  */
1324 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1325 {
1326         struct snd_pcm_runtime *runtime = substream->runtime;
1327         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1328                 return -ENOSYS;
1329         if (push) {
1330                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1331                         return -EBADFD;
1332         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1333                 return -EBADFD;
1334         runtime->trigger_master = substream;
1335         return 0;
1336 }
1337
1338 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1339 {
1340         if (substream->runtime->trigger_master != substream)
1341                 return 0;
1342         /* some drivers might use hw_ptr to recover from the pause -
1343            update the hw_ptr now */
1344         if (push)
1345                 snd_pcm_update_hw_ptr(substream);
1346         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1347          * a delta between the current jiffies, this gives a large enough
1348          * delta, effectively to skip the check once.
1349          */
1350         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1351         return substream->ops->trigger(substream,
1352                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1353                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1354 }
1355
1356 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1357 {
1358         if (substream->runtime->trigger_master == substream)
1359                 substream->ops->trigger(substream,
1360                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1361                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1362 }
1363
1364 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1365 {
1366         struct snd_pcm_runtime *runtime = substream->runtime;
1367         snd_pcm_trigger_tstamp(substream);
1368         if (push) {
1369                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1370                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1371                 wake_up(&runtime->sleep);
1372                 wake_up(&runtime->tsleep);
1373         } else {
1374                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1375                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1376         }
1377 }
1378
1379 static const struct action_ops snd_pcm_action_pause = {
1380         .pre_action = snd_pcm_pre_pause,
1381         .do_action = snd_pcm_do_pause,
1382         .undo_action = snd_pcm_undo_pause,
1383         .post_action = snd_pcm_post_pause
1384 };
1385
1386 /*
1387  * Push/release the pause for all linked streams.
1388  */
1389 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1390 {
1391         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1392 }
1393
1394 #ifdef CONFIG_PM
1395 /* suspend */
1396
1397 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1398 {
1399         struct snd_pcm_runtime *runtime = substream->runtime;
1400         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1401                 return -EBUSY;
1402         runtime->trigger_master = substream;
1403         return 0;
1404 }
1405
1406 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1407 {
1408         struct snd_pcm_runtime *runtime = substream->runtime;
1409         if (runtime->trigger_master != substream)
1410                 return 0;
1411         if (! snd_pcm_running(substream))
1412                 return 0;
1413         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1414         return 0; /* suspend unconditionally */
1415 }
1416
1417 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1418 {
1419         struct snd_pcm_runtime *runtime = substream->runtime;
1420         snd_pcm_trigger_tstamp(substream);
1421         runtime->status->suspended_state = runtime->status->state;
1422         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1423         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1424         wake_up(&runtime->sleep);
1425         wake_up(&runtime->tsleep);
1426 }
1427
1428 static const struct action_ops snd_pcm_action_suspend = {
1429         .pre_action = snd_pcm_pre_suspend,
1430         .do_action = snd_pcm_do_suspend,
1431         .post_action = snd_pcm_post_suspend
1432 };
1433
1434 /**
1435  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1436  * @substream: the PCM substream
1437  *
1438  * After this call, all streams are changed to SUSPENDED state.
1439  *
1440  * Return: Zero if successful (or @substream is %NULL), or a negative error
1441  * code.
1442  */
1443 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1444 {
1445         int err;
1446         unsigned long flags;
1447
1448         if (! substream)
1449                 return 0;
1450
1451         snd_pcm_stream_lock_irqsave(substream, flags);
1452         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1453         snd_pcm_stream_unlock_irqrestore(substream, flags);
1454         return err;
1455 }
1456 EXPORT_SYMBOL(snd_pcm_suspend);
1457
1458 /**
1459  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1460  * @pcm: the PCM instance
1461  *
1462  * After this call, all streams are changed to SUSPENDED state.
1463  *
1464  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1465  */
1466 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1467 {
1468         struct snd_pcm_substream *substream;
1469         int stream, err = 0;
1470
1471         if (! pcm)
1472                 return 0;
1473
1474         for (stream = 0; stream < 2; stream++) {
1475                 for (substream = pcm->streams[stream].substream;
1476                      substream; substream = substream->next) {
1477                         /* FIXME: the open/close code should lock this as well */
1478                         if (substream->runtime == NULL)
1479                                 continue;
1480                         err = snd_pcm_suspend(substream);
1481                         if (err < 0 && err != -EBUSY)
1482                                 return err;
1483                 }
1484         }
1485         return 0;
1486 }
1487 EXPORT_SYMBOL(snd_pcm_suspend_all);
1488
1489 /* resume */
1490
1491 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1492 {
1493         struct snd_pcm_runtime *runtime = substream->runtime;
1494         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1495                 return -ENOSYS;
1496         runtime->trigger_master = substream;
1497         return 0;
1498 }
1499
1500 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1501 {
1502         struct snd_pcm_runtime *runtime = substream->runtime;
1503         if (runtime->trigger_master != substream)
1504                 return 0;
1505         /* DMA not running previously? */
1506         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1507             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1508              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1509                 return 0;
1510         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1511 }
1512
1513 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1514 {
1515         if (substream->runtime->trigger_master == substream &&
1516             snd_pcm_running(substream))
1517                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1518 }
1519
1520 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1521 {
1522         struct snd_pcm_runtime *runtime = substream->runtime;
1523         snd_pcm_trigger_tstamp(substream);
1524         runtime->status->state = runtime->status->suspended_state;
1525         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1526 }
1527
1528 static const struct action_ops snd_pcm_action_resume = {
1529         .pre_action = snd_pcm_pre_resume,
1530         .do_action = snd_pcm_do_resume,
1531         .undo_action = snd_pcm_undo_resume,
1532         .post_action = snd_pcm_post_resume
1533 };
1534
1535 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1536 {
1537         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1538 }
1539
1540 #else
1541
1542 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1543 {
1544         return -ENOSYS;
1545 }
1546
1547 #endif /* CONFIG_PM */
1548
1549 /*
1550  * xrun ioctl
1551  *
1552  * Change the RUNNING stream(s) to XRUN state.
1553  */
1554 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1555 {
1556         struct snd_pcm_runtime *runtime = substream->runtime;
1557         int result;
1558
1559         snd_pcm_stream_lock_irq(substream);
1560         switch (runtime->status->state) {
1561         case SNDRV_PCM_STATE_XRUN:
1562                 result = 0;     /* already there */
1563                 break;
1564         case SNDRV_PCM_STATE_RUNNING:
1565                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1566                 break;
1567         default:
1568                 result = -EBADFD;
1569         }
1570         snd_pcm_stream_unlock_irq(substream);
1571         return result;
1572 }
1573
1574 /*
1575  * reset ioctl
1576  */
1577 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1578 {
1579         struct snd_pcm_runtime *runtime = substream->runtime;
1580         switch (runtime->status->state) {
1581         case SNDRV_PCM_STATE_RUNNING:
1582         case SNDRV_PCM_STATE_PREPARED:
1583         case SNDRV_PCM_STATE_PAUSED:
1584         case SNDRV_PCM_STATE_SUSPENDED:
1585                 return 0;
1586         default:
1587                 return -EBADFD;
1588         }
1589 }
1590
1591 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1592 {
1593         struct snd_pcm_runtime *runtime = substream->runtime;
1594         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1595         if (err < 0)
1596                 return err;
1597         runtime->hw_ptr_base = 0;
1598         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1599                 runtime->status->hw_ptr % runtime->period_size;
1600         runtime->silence_start = runtime->status->hw_ptr;
1601         runtime->silence_filled = 0;
1602         return 0;
1603 }
1604
1605 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1606 {
1607         struct snd_pcm_runtime *runtime = substream->runtime;
1608         runtime->control->appl_ptr = runtime->status->hw_ptr;
1609         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1610             runtime->silence_size > 0)
1611                 snd_pcm_playback_silence(substream, ULONG_MAX);
1612 }
1613
1614 static const struct action_ops snd_pcm_action_reset = {
1615         .pre_action = snd_pcm_pre_reset,
1616         .do_action = snd_pcm_do_reset,
1617         .post_action = snd_pcm_post_reset
1618 };
1619
1620 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1621 {
1622         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1623 }
1624
1625 /*
1626  * prepare ioctl
1627  */
1628 /* we use the second argument for updating f_flags */
1629 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1630                                int f_flags)
1631 {
1632         struct snd_pcm_runtime *runtime = substream->runtime;
1633         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1634             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1635                 return -EBADFD;
1636         if (snd_pcm_running(substream))
1637                 return -EBUSY;
1638         substream->f_flags = f_flags;
1639         return 0;
1640 }
1641
1642 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1643 {
1644         int err;
1645         err = substream->ops->prepare(substream);
1646         if (err < 0)
1647                 return err;
1648         return snd_pcm_do_reset(substream, 0);
1649 }
1650
1651 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1652 {
1653         struct snd_pcm_runtime *runtime = substream->runtime;
1654         runtime->control->appl_ptr = runtime->status->hw_ptr;
1655         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1656 }
1657
1658 static const struct action_ops snd_pcm_action_prepare = {
1659         .pre_action = snd_pcm_pre_prepare,
1660         .do_action = snd_pcm_do_prepare,
1661         .post_action = snd_pcm_post_prepare
1662 };
1663
1664 /**
1665  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1666  * @substream: the PCM substream instance
1667  * @file: file to refer f_flags
1668  *
1669  * Return: Zero if successful, or a negative error code.
1670  */
1671 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1672                            struct file *file)
1673 {
1674         int f_flags;
1675
1676         if (file)
1677                 f_flags = file->f_flags;
1678         else
1679                 f_flags = substream->f_flags;
1680
1681         snd_pcm_stream_lock_irq(substream);
1682         switch (substream->runtime->status->state) {
1683         case SNDRV_PCM_STATE_PAUSED:
1684                 snd_pcm_pause(substream, 0);
1685                 /* fallthru */
1686         case SNDRV_PCM_STATE_SUSPENDED:
1687                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1688                 break;
1689         }
1690         snd_pcm_stream_unlock_irq(substream);
1691
1692         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1693                                         substream, f_flags);
1694 }
1695
1696 /*
1697  * drain ioctl
1698  */
1699
1700 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1701 {
1702         struct snd_pcm_runtime *runtime = substream->runtime;
1703         switch (runtime->status->state) {
1704         case SNDRV_PCM_STATE_OPEN:
1705         case SNDRV_PCM_STATE_DISCONNECTED:
1706         case SNDRV_PCM_STATE_SUSPENDED:
1707                 return -EBADFD;
1708         }
1709         runtime->trigger_master = substream;
1710         return 0;
1711 }
1712
1713 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1714 {
1715         struct snd_pcm_runtime *runtime = substream->runtime;
1716         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1717                 switch (runtime->status->state) {
1718                 case SNDRV_PCM_STATE_PREPARED:
1719                         /* start playback stream if possible */
1720                         if (! snd_pcm_playback_empty(substream)) {
1721                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1722                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1723                         } else {
1724                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1725                         }
1726                         break;
1727                 case SNDRV_PCM_STATE_RUNNING:
1728                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1729                         break;
1730                 case SNDRV_PCM_STATE_XRUN:
1731                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1732                         break;
1733                 default:
1734                         break;
1735                 }
1736         } else {
1737                 /* stop running stream */
1738                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1739                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1740                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1741                         snd_pcm_do_stop(substream, new_state);
1742                         snd_pcm_post_stop(substream, new_state);
1743                 }
1744         }
1745
1746         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1747             runtime->trigger_master == substream &&
1748             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1749                 return substream->ops->trigger(substream,
1750                                                SNDRV_PCM_TRIGGER_DRAIN);
1751
1752         return 0;
1753 }
1754
1755 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1756 {
1757 }
1758
1759 static const struct action_ops snd_pcm_action_drain_init = {
1760         .pre_action = snd_pcm_pre_drain_init,
1761         .do_action = snd_pcm_do_drain_init,
1762         .post_action = snd_pcm_post_drain_init
1763 };
1764
1765 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1766
1767 /*
1768  * Drain the stream(s).
1769  * When the substream is linked, sync until the draining of all playback streams
1770  * is finished.
1771  * After this call, all streams are supposed to be either SETUP or DRAINING
1772  * (capture only) state.
1773  */
1774 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1775                          struct file *file)
1776 {
1777         struct snd_card *card;
1778         struct snd_pcm_runtime *runtime;
1779         struct snd_pcm_substream *s;
1780         wait_queue_entry_t wait;
1781         int result = 0;
1782         int nonblock = 0;
1783
1784         card = substream->pcm->card;
1785         runtime = substream->runtime;
1786
1787         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1788                 return -EBADFD;
1789
1790         if (file) {
1791                 if (file->f_flags & O_NONBLOCK)
1792                         nonblock = 1;
1793         } else if (substream->f_flags & O_NONBLOCK)
1794                 nonblock = 1;
1795
1796         down_read(&snd_pcm_link_rwsem);
1797         snd_pcm_stream_lock_irq(substream);
1798         /* resume pause */
1799         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1800                 snd_pcm_pause(substream, 0);
1801
1802         /* pre-start/stop - all running streams are changed to DRAINING state */
1803         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1804         if (result < 0)
1805                 goto unlock;
1806         /* in non-blocking, we don't wait in ioctl but let caller poll */
1807         if (nonblock) {
1808                 result = -EAGAIN;
1809                 goto unlock;
1810         }
1811
1812         for (;;) {
1813                 long tout;
1814                 struct snd_pcm_runtime *to_check;
1815                 if (signal_pending(current)) {
1816                         result = -ERESTARTSYS;
1817                         break;
1818                 }
1819                 /* find a substream to drain */
1820                 to_check = NULL;
1821                 snd_pcm_group_for_each_entry(s, substream) {
1822                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1823                                 continue;
1824                         runtime = s->runtime;
1825                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1826                                 to_check = runtime;
1827                                 break;
1828                         }
1829                 }
1830                 if (!to_check)
1831                         break; /* all drained */
1832                 init_waitqueue_entry(&wait, current);
1833                 add_wait_queue(&to_check->sleep, &wait);
1834                 snd_pcm_stream_unlock_irq(substream);
1835                 up_read(&snd_pcm_link_rwsem);
1836                 if (runtime->no_period_wakeup)
1837                         tout = MAX_SCHEDULE_TIMEOUT;
1838                 else {
1839                         tout = 10;
1840                         if (runtime->rate) {
1841                                 long t = runtime->period_size * 2 / runtime->rate;
1842                                 tout = max(t, tout);
1843                         }
1844                         tout = msecs_to_jiffies(tout * 1000);
1845                 }
1846                 tout = schedule_timeout_interruptible(tout);
1847                 down_read(&snd_pcm_link_rwsem);
1848                 snd_pcm_stream_lock_irq(substream);
1849                 remove_wait_queue(&to_check->sleep, &wait);
1850                 if (card->shutdown) {
1851                         result = -ENODEV;
1852                         break;
1853                 }
1854                 if (tout == 0) {
1855                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1856                                 result = -ESTRPIPE;
1857                         else {
1858                                 dev_dbg(substream->pcm->card->dev,
1859                                         "playback drain error (DMA or IRQ trouble?)\n");
1860                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1861                                 result = -EIO;
1862                         }
1863                         break;
1864                 }
1865         }
1866
1867  unlock:
1868         snd_pcm_stream_unlock_irq(substream);
1869         up_read(&snd_pcm_link_rwsem);
1870
1871         return result;
1872 }
1873
1874 /*
1875  * drop ioctl
1876  *
1877  * Immediately put all linked substreams into SETUP state.
1878  */
1879 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1880 {
1881         struct snd_pcm_runtime *runtime;
1882         int result = 0;
1883
1884         if (PCM_RUNTIME_CHECK(substream))
1885                 return -ENXIO;
1886         runtime = substream->runtime;
1887
1888         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1889             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1890                 return -EBADFD;
1891
1892         snd_pcm_stream_lock_irq(substream);
1893         /* resume pause */
1894         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1895                 snd_pcm_pause(substream, 0);
1896
1897         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1898         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1899         snd_pcm_stream_unlock_irq(substream);
1900
1901         return result;
1902 }
1903
1904
1905 static bool is_pcm_file(struct file *file)
1906 {
1907         struct inode *inode = file_inode(file);
1908         unsigned int minor;
1909
1910         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1911                 return false;
1912         minor = iminor(inode);
1913         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1914                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1915 }
1916
1917 /*
1918  * PCM link handling
1919  */
1920 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1921 {
1922         int res = 0;
1923         struct snd_pcm_file *pcm_file;
1924         struct snd_pcm_substream *substream1;
1925         struct snd_pcm_group *group;
1926         struct fd f = fdget(fd);
1927
1928         if (!f.file)
1929                 return -EBADFD;
1930         if (!is_pcm_file(f.file)) {
1931                 res = -EBADFD;
1932                 goto _badf;
1933         }
1934         pcm_file = f.file->private_data;
1935         substream1 = pcm_file->substream;
1936         group = kmalloc(sizeof(*group), GFP_KERNEL);
1937         if (!group) {
1938                 res = -ENOMEM;
1939                 goto _nolock;
1940         }
1941         down_write_nonblock(&snd_pcm_link_rwsem);
1942         write_lock_irq(&snd_pcm_link_rwlock);
1943         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1944             substream->runtime->status->state != substream1->runtime->status->state ||
1945             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1946                 res = -EBADFD;
1947                 goto _end;
1948         }
1949         if (snd_pcm_stream_linked(substream1)) {
1950                 res = -EALREADY;
1951                 goto _end;
1952         }
1953         if (!snd_pcm_stream_linked(substream)) {
1954                 substream->group = group;
1955                 group = NULL;
1956                 spin_lock_init(&substream->group->lock);
1957                 mutex_init(&substream->group->mutex);
1958                 INIT_LIST_HEAD(&substream->group->substreams);
1959                 list_add_tail(&substream->link_list, &substream->group->substreams);
1960                 substream->group->count = 1;
1961         }
1962         list_add_tail(&substream1->link_list, &substream->group->substreams);
1963         substream->group->count++;
1964         substream1->group = substream->group;
1965  _end:
1966         write_unlock_irq(&snd_pcm_link_rwlock);
1967         up_write(&snd_pcm_link_rwsem);
1968  _nolock:
1969         snd_card_unref(substream1->pcm->card);
1970         kfree(group);
1971  _badf:
1972         fdput(f);
1973         return res;
1974 }
1975
1976 static void relink_to_local(struct snd_pcm_substream *substream)
1977 {
1978         substream->group = &substream->self_group;
1979         INIT_LIST_HEAD(&substream->self_group.substreams);
1980         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1981 }
1982
1983 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1984 {
1985         struct snd_pcm_substream *s;
1986         int res = 0;
1987
1988         down_write_nonblock(&snd_pcm_link_rwsem);
1989         write_lock_irq(&snd_pcm_link_rwlock);
1990         if (!snd_pcm_stream_linked(substream)) {
1991                 res = -EALREADY;
1992                 goto _end;
1993         }
1994         list_del(&substream->link_list);
1995         substream->group->count--;
1996         if (substream->group->count == 1) {     /* detach the last stream, too */
1997                 snd_pcm_group_for_each_entry(s, substream) {
1998                         relink_to_local(s);
1999                         break;
2000                 }
2001                 kfree(substream->group);
2002         }
2003         relink_to_local(substream);
2004        _end:
2005         write_unlock_irq(&snd_pcm_link_rwlock);
2006         up_write(&snd_pcm_link_rwsem);
2007         return res;
2008 }
2009
2010 /*
2011  * hw configurator
2012  */
2013 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2014                                struct snd_pcm_hw_rule *rule)
2015 {
2016         struct snd_interval t;
2017         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2018                      hw_param_interval_c(params, rule->deps[1]), &t);
2019         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2020 }
2021
2022 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2023                                struct snd_pcm_hw_rule *rule)
2024 {
2025         struct snd_interval t;
2026         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2027                      hw_param_interval_c(params, rule->deps[1]), &t);
2028         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2029 }
2030
2031 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2032                                    struct snd_pcm_hw_rule *rule)
2033 {
2034         struct snd_interval t;
2035         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2036                          hw_param_interval_c(params, rule->deps[1]),
2037                          (unsigned long) rule->private, &t);
2038         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2039 }
2040
2041 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2042                                    struct snd_pcm_hw_rule *rule)
2043 {
2044         struct snd_interval t;
2045         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2046                          (unsigned long) rule->private,
2047                          hw_param_interval_c(params, rule->deps[1]), &t);
2048         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2049 }
2050
2051 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2052                                   struct snd_pcm_hw_rule *rule)
2053 {
2054         unsigned int k;
2055         const struct snd_interval *i =
2056                                 hw_param_interval_c(params, rule->deps[0]);
2057         struct snd_mask m;
2058         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2059         snd_mask_any(&m);
2060         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2061                 int bits;
2062                 if (! snd_mask_test(mask, k))
2063                         continue;
2064                 bits = snd_pcm_format_physical_width(k);
2065                 if (bits <= 0)
2066                         continue; /* ignore invalid formats */
2067                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2068                         snd_mask_reset(&m, k);
2069         }
2070         return snd_mask_refine(mask, &m);
2071 }
2072
2073 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2074                                        struct snd_pcm_hw_rule *rule)
2075 {
2076         struct snd_interval t;
2077         unsigned int k;
2078         t.min = UINT_MAX;
2079         t.max = 0;
2080         t.openmin = 0;
2081         t.openmax = 0;
2082         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2083                 int bits;
2084                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2085                         continue;
2086                 bits = snd_pcm_format_physical_width(k);
2087                 if (bits <= 0)
2088                         continue; /* ignore invalid formats */
2089                 if (t.min > (unsigned)bits)
2090                         t.min = bits;
2091                 if (t.max < (unsigned)bits)
2092                         t.max = bits;
2093         }
2094         t.integer = 1;
2095         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2096 }
2097
2098 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2099 #error "Change this table"
2100 #endif
2101
2102 static const unsigned int rates[] = {
2103         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2104         48000, 64000, 88200, 96000, 176400, 192000
2105 };
2106
2107 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2108         .count = ARRAY_SIZE(rates),
2109         .list = rates,
2110 };
2111
2112 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2113                                 struct snd_pcm_hw_rule *rule)
2114 {
2115         struct snd_pcm_hardware *hw = rule->private;
2116         return snd_interval_list(hw_param_interval(params, rule->var),
2117                                  snd_pcm_known_rates.count,
2118                                  snd_pcm_known_rates.list, hw->rates);
2119 }
2120
2121 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2122                                             struct snd_pcm_hw_rule *rule)
2123 {
2124         struct snd_interval t;
2125         struct snd_pcm_substream *substream = rule->private;
2126         t.min = 0;
2127         t.max = substream->buffer_bytes_max;
2128         t.openmin = 0;
2129         t.openmax = 0;
2130         t.integer = 1;
2131         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2132 }
2133
2134 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2135 {
2136         struct snd_pcm_runtime *runtime = substream->runtime;
2137         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2138         int k, err;
2139
2140         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2141                 snd_mask_any(constrs_mask(constrs, k));
2142         }
2143
2144         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2145                 snd_interval_any(constrs_interval(constrs, k));
2146         }
2147
2148         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2149         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2150         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2151         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2152         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2153
2154         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2155                                    snd_pcm_hw_rule_format, NULL,
2156                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2157         if (err < 0)
2158                 return err;
2159         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2160                                   snd_pcm_hw_rule_sample_bits, NULL,
2161                                   SNDRV_PCM_HW_PARAM_FORMAT,
2162                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2163         if (err < 0)
2164                 return err;
2165         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2166                                   snd_pcm_hw_rule_div, NULL,
2167                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2168         if (err < 0)
2169                 return err;
2170         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2171                                   snd_pcm_hw_rule_mul, NULL,
2172                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2173         if (err < 0)
2174                 return err;
2175         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2176                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2177                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2178         if (err < 0)
2179                 return err;
2180         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2181                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2182                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2183         if (err < 0)
2184                 return err;
2185         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2186                                   snd_pcm_hw_rule_div, NULL,
2187                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2188         if (err < 0)
2189                 return err;
2190         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2191                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2192                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2193         if (err < 0)
2194                 return err;
2195         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2196                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2197                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2198         if (err < 0)
2199                 return err;
2200         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2201                                   snd_pcm_hw_rule_div, NULL,
2202                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2203         if (err < 0)
2204                 return err;
2205         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2206                                   snd_pcm_hw_rule_div, NULL,
2207                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2208         if (err < 0)
2209                 return err;
2210         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2211                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2212                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2213         if (err < 0)
2214                 return err;
2215         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2216                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2217                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2218         if (err < 0)
2219                 return err;
2220         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2221                                   snd_pcm_hw_rule_mul, NULL,
2222                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2223         if (err < 0)
2224                 return err;
2225         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2226                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2227                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2228         if (err < 0)
2229                 return err;
2230         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2231                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2232                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2233         if (err < 0)
2234                 return err;
2235         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2236                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2237                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2238         if (err < 0)
2239                 return err;
2240         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2241                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2242                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2243         if (err < 0)
2244                 return err;
2245         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2246                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2247                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2248         if (err < 0)
2249                 return err;
2250         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2251                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2252                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2253         if (err < 0)
2254                 return err;
2255         return 0;
2256 }
2257
2258 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2259 {
2260         struct snd_pcm_runtime *runtime = substream->runtime;
2261         struct snd_pcm_hardware *hw = &runtime->hw;
2262         int err;
2263         unsigned int mask = 0;
2264
2265         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2266                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2267         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2268                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2269         if (hw_support_mmap(substream)) {
2270                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2271                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2272                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2273                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2274                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2275                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2276         }
2277         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2278         if (err < 0)
2279                 return err;
2280
2281         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2282         if (err < 0)
2283                 return err;
2284
2285         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2286         if (err < 0)
2287                 return err;
2288
2289         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2290                                            hw->channels_min, hw->channels_max);
2291         if (err < 0)
2292                 return err;
2293
2294         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2295                                            hw->rate_min, hw->rate_max);
2296         if (err < 0)
2297                 return err;
2298
2299         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2300                                            hw->period_bytes_min, hw->period_bytes_max);
2301         if (err < 0)
2302                 return err;
2303
2304         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2305                                            hw->periods_min, hw->periods_max);
2306         if (err < 0)
2307                 return err;
2308
2309         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2310                                            hw->period_bytes_min, hw->buffer_bytes_max);
2311         if (err < 0)
2312                 return err;
2313
2314         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2315                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2316                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2317         if (err < 0)
2318                 return err;
2319
2320         /* FIXME: remove */
2321         if (runtime->dma_bytes) {
2322                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2323                 if (err < 0)
2324                         return err;
2325         }
2326
2327         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2328                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2329                                           snd_pcm_hw_rule_rate, hw,
2330                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2331                 if (err < 0)
2332                         return err;
2333         }
2334
2335         /* FIXME: this belong to lowlevel */
2336         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2337
2338         return 0;
2339 }
2340
2341 static void pcm_release_private(struct snd_pcm_substream *substream)
2342 {
2343         snd_pcm_unlink(substream);
2344 }
2345
2346 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2347 {
2348         substream->ref_count--;
2349         if (substream->ref_count > 0)
2350                 return;
2351
2352         snd_pcm_drop(substream);
2353         if (substream->hw_opened) {
2354                 if (substream->ops->hw_free &&
2355                     substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2356                         substream->ops->hw_free(substream);
2357                 substream->ops->close(substream);
2358                 substream->hw_opened = 0;
2359         }
2360         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2361                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2362         if (substream->pcm_release) {
2363                 substream->pcm_release(substream);
2364                 substream->pcm_release = NULL;
2365         }
2366         snd_pcm_detach_substream(substream);
2367 }
2368 EXPORT_SYMBOL(snd_pcm_release_substream);
2369
2370 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2371                            struct file *file,
2372                            struct snd_pcm_substream **rsubstream)
2373 {
2374         struct snd_pcm_substream *substream;
2375         int err;
2376
2377         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2378         if (err < 0)
2379                 return err;
2380         if (substream->ref_count > 1) {
2381                 *rsubstream = substream;
2382                 return 0;
2383         }
2384
2385         err = snd_pcm_hw_constraints_init(substream);
2386         if (err < 0) {
2387                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2388                 goto error;
2389         }
2390
2391         if ((err = substream->ops->open(substream)) < 0)
2392                 goto error;
2393
2394         substream->hw_opened = 1;
2395
2396         err = snd_pcm_hw_constraints_complete(substream);
2397         if (err < 0) {
2398                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2399                 goto error;
2400         }
2401
2402         *rsubstream = substream;
2403         return 0;
2404
2405  error:
2406         snd_pcm_release_substream(substream);
2407         return err;
2408 }
2409 EXPORT_SYMBOL(snd_pcm_open_substream);
2410
2411 static int snd_pcm_open_file(struct file *file,
2412                              struct snd_pcm *pcm,
2413                              int stream)
2414 {
2415         struct snd_pcm_file *pcm_file;
2416         struct snd_pcm_substream *substream;
2417         int err;
2418
2419         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2420         if (err < 0)
2421                 return err;
2422
2423         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2424         if (pcm_file == NULL) {
2425                 snd_pcm_release_substream(substream);
2426                 return -ENOMEM;
2427         }
2428         pcm_file->substream = substream;
2429         if (substream->ref_count == 1) {
2430                 substream->file = pcm_file;
2431                 substream->pcm_release = pcm_release_private;
2432         }
2433         file->private_data = pcm_file;
2434
2435         return 0;
2436 }
2437
2438 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2439 {
2440         struct snd_pcm *pcm;
2441         int err = nonseekable_open(inode, file);
2442         if (err < 0)
2443                 return err;
2444         pcm = snd_lookup_minor_data(iminor(inode),
2445                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2446         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2447         if (pcm)
2448                 snd_card_unref(pcm->card);
2449         return err;
2450 }
2451
2452 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2453 {
2454         struct snd_pcm *pcm;
2455         int err = nonseekable_open(inode, file);
2456         if (err < 0)
2457                 return err;
2458         pcm = snd_lookup_minor_data(iminor(inode),
2459                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2460         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2461         if (pcm)
2462                 snd_card_unref(pcm->card);
2463         return err;
2464 }
2465
2466 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2467 {
2468         int err;
2469         wait_queue_entry_t wait;
2470
2471         if (pcm == NULL) {
2472                 err = -ENODEV;
2473                 goto __error1;
2474         }
2475         err = snd_card_file_add(pcm->card, file);
2476         if (err < 0)
2477                 goto __error1;
2478         if (!try_module_get(pcm->card->module)) {
2479                 err = -EFAULT;
2480                 goto __error2;
2481         }
2482         init_waitqueue_entry(&wait, current);
2483         add_wait_queue(&pcm->open_wait, &wait);
2484         mutex_lock(&pcm->open_mutex);
2485         while (1) {
2486                 err = snd_pcm_open_file(file, pcm, stream);
2487                 if (err >= 0)
2488                         break;
2489                 if (err == -EAGAIN) {
2490                         if (file->f_flags & O_NONBLOCK) {
2491                                 err = -EBUSY;
2492                                 break;
2493                         }
2494                 } else
2495                         break;
2496                 set_current_state(TASK_INTERRUPTIBLE);
2497                 mutex_unlock(&pcm->open_mutex);
2498                 schedule();
2499                 mutex_lock(&pcm->open_mutex);
2500                 if (pcm->card->shutdown) {
2501                         err = -ENODEV;
2502                         break;
2503                 }
2504                 if (signal_pending(current)) {
2505                         err = -ERESTARTSYS;
2506                         break;
2507                 }
2508         }
2509         remove_wait_queue(&pcm->open_wait, &wait);
2510         mutex_unlock(&pcm->open_mutex);
2511         if (err < 0)
2512                 goto __error;
2513         return err;
2514
2515       __error:
2516         module_put(pcm->card->module);
2517       __error2:
2518         snd_card_file_remove(pcm->card, file);
2519       __error1:
2520         return err;
2521 }
2522
2523 static int snd_pcm_release(struct inode *inode, struct file *file)
2524 {
2525         struct snd_pcm *pcm;
2526         struct snd_pcm_substream *substream;
2527         struct snd_pcm_file *pcm_file;
2528
2529         pcm_file = file->private_data;
2530         substream = pcm_file->substream;
2531         if (snd_BUG_ON(!substream))
2532                 return -ENXIO;
2533         pcm = substream->pcm;
2534         mutex_lock(&pcm->open_mutex);
2535         snd_pcm_release_substream(substream);
2536         kfree(pcm_file);
2537         mutex_unlock(&pcm->open_mutex);
2538         wake_up(&pcm->open_wait);
2539         module_put(pcm->card->module);
2540         snd_card_file_remove(pcm->card, file);
2541         return 0;
2542 }
2543
2544 /* check and update PCM state; return 0 or a negative error
2545  * call this inside PCM lock
2546  */
2547 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2548 {
2549         switch (substream->runtime->status->state) {
2550         case SNDRV_PCM_STATE_DRAINING:
2551                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2552                         return -EBADFD;
2553                 /* Fall through */
2554         case SNDRV_PCM_STATE_RUNNING:
2555                 return snd_pcm_update_hw_ptr(substream);
2556         case SNDRV_PCM_STATE_PREPARED:
2557         case SNDRV_PCM_STATE_PAUSED:
2558                 return 0;
2559         case SNDRV_PCM_STATE_SUSPENDED:
2560                 return -ESTRPIPE;
2561         case SNDRV_PCM_STATE_XRUN:
2562                 return -EPIPE;
2563         default:
2564                 return -EBADFD;
2565         }
2566 }
2567
2568 /* increase the appl_ptr; returns the processed frames or a negative error */
2569 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2570                                           snd_pcm_uframes_t frames,
2571                                            snd_pcm_sframes_t avail)
2572 {
2573         struct snd_pcm_runtime *runtime = substream->runtime;
2574         snd_pcm_sframes_t appl_ptr;
2575         int ret;
2576
2577         if (avail <= 0)
2578                 return 0;
2579         if (frames > (snd_pcm_uframes_t)avail)
2580                 frames = avail;
2581         appl_ptr = runtime->control->appl_ptr + frames;
2582         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2583                 appl_ptr -= runtime->boundary;
2584         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2585         return ret < 0 ? ret : frames;
2586 }
2587
2588 /* decrease the appl_ptr; returns the processed frames or zero for error */
2589 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2590                                          snd_pcm_uframes_t frames,
2591                                          snd_pcm_sframes_t avail)
2592 {
2593         struct snd_pcm_runtime *runtime = substream->runtime;
2594         snd_pcm_sframes_t appl_ptr;
2595         int ret;
2596
2597         if (avail <= 0)
2598                 return 0;
2599         if (frames > (snd_pcm_uframes_t)avail)
2600                 frames = avail;
2601         appl_ptr = runtime->control->appl_ptr - frames;
2602         if (appl_ptr < 0)
2603                 appl_ptr += runtime->boundary;
2604         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2605         /* NOTE: we return zero for errors because PulseAudio gets depressed
2606          * upon receiving an error from rewind ioctl and stops processing
2607          * any longer.  Returning zero means that no rewind is done, so
2608          * it's not absolutely wrong to answer like that.
2609          */
2610         return ret < 0 ? 0 : frames;
2611 }
2612
2613 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2614                                                  snd_pcm_uframes_t frames)
2615 {
2616         struct snd_pcm_runtime *runtime = substream->runtime;
2617         snd_pcm_sframes_t ret;
2618
2619         if (frames == 0)
2620                 return 0;
2621
2622         snd_pcm_stream_lock_irq(substream);
2623         ret = do_pcm_hwsync(substream);
2624         if (!ret)
2625                 ret = rewind_appl_ptr(substream, frames,
2626                                       snd_pcm_playback_hw_avail(runtime));
2627         snd_pcm_stream_unlock_irq(substream);
2628         return ret;
2629 }
2630
2631 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2632                                                 snd_pcm_uframes_t frames)
2633 {
2634         struct snd_pcm_runtime *runtime = substream->runtime;
2635         snd_pcm_sframes_t ret;
2636
2637         if (frames == 0)
2638                 return 0;
2639
2640         snd_pcm_stream_lock_irq(substream);
2641         ret = do_pcm_hwsync(substream);
2642         if (!ret)
2643                 ret = rewind_appl_ptr(substream, frames,
2644                                       snd_pcm_capture_hw_avail(runtime));
2645         snd_pcm_stream_unlock_irq(substream);
2646         return ret;
2647 }
2648
2649 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2650                                                   snd_pcm_uframes_t frames)
2651 {
2652         struct snd_pcm_runtime *runtime = substream->runtime;
2653         snd_pcm_sframes_t ret;
2654
2655         if (frames == 0)
2656                 return 0;
2657
2658         snd_pcm_stream_lock_irq(substream);
2659         ret = do_pcm_hwsync(substream);
2660         if (!ret)
2661                 ret = forward_appl_ptr(substream, frames,
2662                                        snd_pcm_playback_avail(runtime));
2663         snd_pcm_stream_unlock_irq(substream);
2664         return ret;
2665 }
2666
2667 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2668                                                  snd_pcm_uframes_t frames)
2669 {
2670         struct snd_pcm_runtime *runtime = substream->runtime;
2671         snd_pcm_sframes_t ret;
2672
2673         if (frames == 0)
2674                 return 0;
2675
2676         snd_pcm_stream_lock_irq(substream);
2677         ret = do_pcm_hwsync(substream);
2678         if (!ret)
2679                 ret = forward_appl_ptr(substream, frames,
2680                                        snd_pcm_capture_avail(runtime));
2681         snd_pcm_stream_unlock_irq(substream);
2682         return ret;
2683 }
2684
2685 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2686 {
2687         int err;
2688
2689         snd_pcm_stream_lock_irq(substream);
2690         err = do_pcm_hwsync(substream);
2691         snd_pcm_stream_unlock_irq(substream);
2692         return err;
2693 }
2694
2695 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream)
2696 {
2697         struct snd_pcm_runtime *runtime = substream->runtime;
2698         int err;
2699         snd_pcm_sframes_t n = 0;
2700
2701         snd_pcm_stream_lock_irq(substream);
2702         err = do_pcm_hwsync(substream);
2703         if (!err) {
2704                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2705                         n = snd_pcm_playback_hw_avail(runtime);
2706                 else
2707                         n = snd_pcm_capture_avail(runtime);
2708                 n += runtime->delay;
2709         }
2710         snd_pcm_stream_unlock_irq(substream);
2711         return err < 0 ? err : n;
2712 }
2713
2714 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2715                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2716 {
2717         struct snd_pcm_runtime *runtime = substream->runtime;
2718         struct snd_pcm_sync_ptr sync_ptr;
2719         volatile struct snd_pcm_mmap_status *status;
2720         volatile struct snd_pcm_mmap_control *control;
2721         int err;
2722
2723         memset(&sync_ptr, 0, sizeof(sync_ptr));
2724         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2725                 return -EFAULT;
2726         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2727                 return -EFAULT;
2728         status = runtime->status;
2729         control = runtime->control;
2730         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2731                 err = snd_pcm_hwsync(substream);
2732                 if (err < 0)
2733                         return err;
2734         }
2735         snd_pcm_stream_lock_irq(substream);
2736         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2737                 err = pcm_lib_apply_appl_ptr(substream,
2738                                              sync_ptr.c.control.appl_ptr);
2739                 if (err < 0) {
2740                         snd_pcm_stream_unlock_irq(substream);
2741                         return err;
2742                 }
2743         } else {
2744                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2745         }
2746         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2747                 control->avail_min = sync_ptr.c.control.avail_min;
2748         else
2749                 sync_ptr.c.control.avail_min = control->avail_min;
2750         sync_ptr.s.status.state = status->state;
2751         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2752         sync_ptr.s.status.tstamp = status->tstamp;
2753         sync_ptr.s.status.suspended_state = status->suspended_state;
2754         snd_pcm_stream_unlock_irq(substream);
2755         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2756                 return -EFAULT;
2757         return 0;
2758 }
2759
2760 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2761 {
2762         struct snd_pcm_runtime *runtime = substream->runtime;
2763         int arg;
2764
2765         if (get_user(arg, _arg))
2766                 return -EFAULT;
2767         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2768                 return -EINVAL;
2769         runtime->tstamp_type = arg;
2770         return 0;
2771 }
2772
2773 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2774                                       struct snd_xferi __user *_xferi)
2775 {
2776         struct snd_xferi xferi;
2777         struct snd_pcm_runtime *runtime = substream->runtime;
2778         snd_pcm_sframes_t result;
2779
2780         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2781                 return -EBADFD;
2782         if (put_user(0, &_xferi->result))
2783                 return -EFAULT;
2784         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2785                 return -EFAULT;
2786         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2787                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2788         else
2789                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2790         __put_user(result, &_xferi->result);
2791         return result < 0 ? result : 0;
2792 }
2793
2794 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2795                                       struct snd_xfern __user *_xfern)
2796 {
2797         struct snd_xfern xfern;
2798         struct snd_pcm_runtime *runtime = substream->runtime;
2799         void *bufs;
2800         snd_pcm_sframes_t result;
2801
2802         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2803                 return -EBADFD;
2804         if (runtime->channels > 128)
2805                 return -EINVAL;
2806         if (put_user(0, &_xfern->result))
2807                 return -EFAULT;
2808         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2809                 return -EFAULT;
2810
2811         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2812         if (IS_ERR(bufs))
2813                 return PTR_ERR(bufs);
2814         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2815                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2816         else
2817                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2818         kfree(bufs);
2819         __put_user(result, &_xfern->result);
2820         return result < 0 ? result : 0;
2821 }
2822
2823 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2824                                 snd_pcm_uframes_t __user *_frames)
2825 {
2826         snd_pcm_uframes_t frames;
2827         snd_pcm_sframes_t result;
2828
2829         if (get_user(frames, _frames))
2830                 return -EFAULT;
2831         if (put_user(0, _frames))
2832                 return -EFAULT;
2833         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2834                 result = snd_pcm_playback_rewind(substream, frames);
2835         else
2836                 result = snd_pcm_capture_rewind(substream, frames);
2837         __put_user(result, _frames);
2838         return result < 0 ? result : 0;
2839 }
2840
2841 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2842                                  snd_pcm_uframes_t __user *_frames)
2843 {
2844         snd_pcm_uframes_t frames;
2845         snd_pcm_sframes_t result;
2846
2847         if (get_user(frames, _frames))
2848                 return -EFAULT;
2849         if (put_user(0, _frames))
2850                 return -EFAULT;
2851         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2852                 result = snd_pcm_playback_forward(substream, frames);
2853         else
2854                 result = snd_pcm_capture_forward(substream, frames);
2855         __put_user(result, _frames);
2856         return result < 0 ? result : 0;
2857 }
2858
2859 static int snd_pcm_common_ioctl(struct file *file,
2860                                  struct snd_pcm_substream *substream,
2861                                  unsigned int cmd, void __user *arg)
2862 {
2863         struct snd_pcm_file *pcm_file = file->private_data;
2864         int res;
2865
2866         if (PCM_RUNTIME_CHECK(substream))
2867                 return -ENXIO;
2868
2869         res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2870         if (res < 0)
2871                 return res;
2872
2873         switch (cmd) {
2874         case SNDRV_PCM_IOCTL_PVERSION:
2875                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2876         case SNDRV_PCM_IOCTL_INFO:
2877                 return snd_pcm_info_user(substream, arg);
2878         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2879                 return 0;
2880         case SNDRV_PCM_IOCTL_TTSTAMP:
2881                 return snd_pcm_tstamp(substream, arg);
2882         case SNDRV_PCM_IOCTL_USER_PVERSION:
2883                 if (get_user(pcm_file->user_pversion,
2884                              (unsigned int __user *)arg))
2885                         return -EFAULT;
2886                 return 0;
2887         case SNDRV_PCM_IOCTL_HW_REFINE:
2888                 return snd_pcm_hw_refine_user(substream, arg);
2889         case SNDRV_PCM_IOCTL_HW_PARAMS:
2890                 return snd_pcm_hw_params_user(substream, arg);
2891         case SNDRV_PCM_IOCTL_HW_FREE:
2892                 return snd_pcm_hw_free(substream);
2893         case SNDRV_PCM_IOCTL_SW_PARAMS:
2894                 return snd_pcm_sw_params_user(substream, arg);
2895         case SNDRV_PCM_IOCTL_STATUS:
2896                 return snd_pcm_status_user(substream, arg, false);
2897         case SNDRV_PCM_IOCTL_STATUS_EXT:
2898                 return snd_pcm_status_user(substream, arg, true);
2899         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2900                 return snd_pcm_channel_info_user(substream, arg);
2901         case SNDRV_PCM_IOCTL_PREPARE:
2902                 return snd_pcm_prepare(substream, file);
2903         case SNDRV_PCM_IOCTL_RESET:
2904                 return snd_pcm_reset(substream);
2905         case SNDRV_PCM_IOCTL_START:
2906                 return snd_pcm_start_lock_irq(substream);
2907         case SNDRV_PCM_IOCTL_LINK:
2908                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2909         case SNDRV_PCM_IOCTL_UNLINK:
2910                 return snd_pcm_unlink(substream);
2911         case SNDRV_PCM_IOCTL_RESUME:
2912                 return snd_pcm_resume(substream);
2913         case SNDRV_PCM_IOCTL_XRUN:
2914                 return snd_pcm_xrun(substream);
2915         case SNDRV_PCM_IOCTL_HWSYNC:
2916                 return snd_pcm_hwsync(substream);
2917         case SNDRV_PCM_IOCTL_DELAY:
2918         {
2919                 snd_pcm_sframes_t delay = snd_pcm_delay(substream);
2920                 snd_pcm_sframes_t __user *res = arg;
2921
2922                 if (delay < 0)
2923                         return delay;
2924                 if (put_user(delay, res))
2925                         return -EFAULT;
2926                 return 0;
2927         }
2928         case SNDRV_PCM_IOCTL_SYNC_PTR:
2929                 return snd_pcm_sync_ptr(substream, arg);
2930 #ifdef CONFIG_SND_SUPPORT_OLD_API
2931         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2932                 return snd_pcm_hw_refine_old_user(substream, arg);
2933         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2934                 return snd_pcm_hw_params_old_user(substream, arg);
2935 #endif
2936         case SNDRV_PCM_IOCTL_DRAIN:
2937                 return snd_pcm_drain(substream, file);
2938         case SNDRV_PCM_IOCTL_DROP:
2939                 return snd_pcm_drop(substream);
2940         case SNDRV_PCM_IOCTL_PAUSE:
2941                 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2942                                                substream,
2943                                                (int)(unsigned long)arg);
2944         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2945         case SNDRV_PCM_IOCTL_READI_FRAMES:
2946                 return snd_pcm_xferi_frames_ioctl(substream, arg);
2947         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2948         case SNDRV_PCM_IOCTL_READN_FRAMES:
2949                 return snd_pcm_xfern_frames_ioctl(substream, arg);
2950         case SNDRV_PCM_IOCTL_REWIND:
2951                 return snd_pcm_rewind_ioctl(substream, arg);
2952         case SNDRV_PCM_IOCTL_FORWARD:
2953                 return snd_pcm_forward_ioctl(substream, arg);
2954         }
2955         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2956         return -ENOTTY;
2957 }
2958
2959 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2960                           unsigned long arg)
2961 {
2962         struct snd_pcm_file *pcm_file;
2963
2964         pcm_file = file->private_data;
2965
2966         if (((cmd >> 8) & 0xff) != 'A')
2967                 return -ENOTTY;
2968
2969         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2970                                      (void __user *)arg);
2971 }
2972
2973 /**
2974  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2975  * @substream: PCM substream
2976  * @cmd: IOCTL cmd
2977  * @arg: IOCTL argument
2978  *
2979  * The function is provided primarily for OSS layer and USB gadget drivers,
2980  * and it allows only the limited set of ioctls (hw_params, sw_params,
2981  * prepare, start, drain, drop, forward).
2982  */
2983 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2984                          unsigned int cmd, void *arg)
2985 {
2986         snd_pcm_uframes_t *frames = arg;
2987         snd_pcm_sframes_t result;
2988
2989         switch (cmd) {
2990         case SNDRV_PCM_IOCTL_FORWARD:
2991         {
2992                 /* provided only for OSS; capture-only and no value returned */
2993                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
2994                         return -EINVAL;
2995                 result = snd_pcm_capture_forward(substream, *frames);
2996                 return result < 0 ? result : 0;
2997         }
2998         case SNDRV_PCM_IOCTL_HW_PARAMS:
2999                 return snd_pcm_hw_params(substream, arg);
3000         case SNDRV_PCM_IOCTL_SW_PARAMS:
3001                 return snd_pcm_sw_params(substream, arg);
3002         case SNDRV_PCM_IOCTL_PREPARE:
3003                 return snd_pcm_prepare(substream, NULL);
3004         case SNDRV_PCM_IOCTL_START:
3005                 return snd_pcm_start_lock_irq(substream);
3006         case SNDRV_PCM_IOCTL_DRAIN:
3007                 return snd_pcm_drain(substream, NULL);
3008         case SNDRV_PCM_IOCTL_DROP:
3009                 return snd_pcm_drop(substream);
3010         case SNDRV_PCM_IOCTL_DELAY:
3011         {
3012                 result = snd_pcm_delay(substream);
3013                 if (result < 0)
3014                         return result;
3015                 *frames = result;
3016                 return 0;
3017         }
3018         default:
3019                 return -EINVAL;
3020         }
3021 }
3022 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3023
3024 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3025                             loff_t * offset)
3026 {
3027         struct snd_pcm_file *pcm_file;
3028         struct snd_pcm_substream *substream;
3029         struct snd_pcm_runtime *runtime;
3030         snd_pcm_sframes_t result;
3031
3032         pcm_file = file->private_data;
3033         substream = pcm_file->substream;
3034         if (PCM_RUNTIME_CHECK(substream))
3035                 return -ENXIO;
3036         runtime = substream->runtime;
3037         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3038                 return -EBADFD;
3039         if (!frame_aligned(runtime, count))
3040                 return -EINVAL;
3041         count = bytes_to_frames(runtime, count);
3042         result = snd_pcm_lib_read(substream, buf, count);
3043         if (result > 0)
3044                 result = frames_to_bytes(runtime, result);
3045         return result;
3046 }
3047
3048 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3049                              size_t count, loff_t * offset)
3050 {
3051         struct snd_pcm_file *pcm_file;
3052         struct snd_pcm_substream *substream;
3053         struct snd_pcm_runtime *runtime;
3054         snd_pcm_sframes_t result;
3055
3056         pcm_file = file->private_data;
3057         substream = pcm_file->substream;
3058         if (PCM_RUNTIME_CHECK(substream))
3059                 return -ENXIO;
3060         runtime = substream->runtime;
3061         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3062                 return -EBADFD;
3063         if (!frame_aligned(runtime, count))
3064                 return -EINVAL;
3065         count = bytes_to_frames(runtime, count);
3066         result = snd_pcm_lib_write(substream, buf, count);
3067         if (result > 0)
3068                 result = frames_to_bytes(runtime, result);
3069         return result;
3070 }
3071
3072 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3073 {
3074         struct snd_pcm_file *pcm_file;
3075         struct snd_pcm_substream *substream;
3076         struct snd_pcm_runtime *runtime;
3077         snd_pcm_sframes_t result;
3078         unsigned long i;
3079         void __user **bufs;
3080         snd_pcm_uframes_t frames;
3081
3082         pcm_file = iocb->ki_filp->private_data;
3083         substream = pcm_file->substream;
3084         if (PCM_RUNTIME_CHECK(substream))
3085                 return -ENXIO;
3086         runtime = substream->runtime;
3087         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3088                 return -EBADFD;
3089         if (!iter_is_iovec(to))
3090                 return -EINVAL;
3091         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3092                 return -EINVAL;
3093         if (!frame_aligned(runtime, to->iov->iov_len))
3094                 return -EINVAL;
3095         frames = bytes_to_samples(runtime, to->iov->iov_len);
3096         bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3097         if (bufs == NULL)
3098                 return -ENOMEM;
3099         for (i = 0; i < to->nr_segs; ++i)
3100                 bufs[i] = to->iov[i].iov_base;
3101         result = snd_pcm_lib_readv(substream, bufs, frames);
3102         if (result > 0)
3103                 result = frames_to_bytes(runtime, result);
3104         kfree(bufs);
3105         return result;
3106 }
3107
3108 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3109 {
3110         struct snd_pcm_file *pcm_file;
3111         struct snd_pcm_substream *substream;
3112         struct snd_pcm_runtime *runtime;
3113         snd_pcm_sframes_t result;
3114         unsigned long i;
3115         void __user **bufs;
3116         snd_pcm_uframes_t frames;
3117
3118         pcm_file = iocb->ki_filp->private_data;
3119         substream = pcm_file->substream;
3120         if (PCM_RUNTIME_CHECK(substream))
3121                 return -ENXIO;
3122         runtime = substream->runtime;
3123         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3124                 return -EBADFD;
3125         if (!iter_is_iovec(from))
3126                 return -EINVAL;
3127         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3128             !frame_aligned(runtime, from->iov->iov_len))
3129                 return -EINVAL;
3130         frames = bytes_to_samples(runtime, from->iov->iov_len);
3131         bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3132         if (bufs == NULL)
3133                 return -ENOMEM;
3134         for (i = 0; i < from->nr_segs; ++i)
3135                 bufs[i] = from->iov[i].iov_base;
3136         result = snd_pcm_lib_writev(substream, bufs, frames);
3137         if (result > 0)
3138                 result = frames_to_bytes(runtime, result);
3139         kfree(bufs);
3140         return result;
3141 }
3142
3143 static __poll_t snd_pcm_playback_poll(struct file *file, poll_table * wait)
3144 {
3145         struct snd_pcm_file *pcm_file;
3146         struct snd_pcm_substream *substream;
3147         struct snd_pcm_runtime *runtime;
3148         __poll_t mask;
3149         snd_pcm_uframes_t avail;
3150
3151         pcm_file = file->private_data;
3152
3153         substream = pcm_file->substream;
3154         if (PCM_RUNTIME_CHECK(substream))
3155                 return EPOLLOUT | EPOLLWRNORM | EPOLLERR;
3156         runtime = substream->runtime;
3157
3158         poll_wait(file, &runtime->sleep, wait);
3159
3160         snd_pcm_stream_lock_irq(substream);
3161         avail = snd_pcm_playback_avail(runtime);
3162         switch (runtime->status->state) {
3163         case SNDRV_PCM_STATE_RUNNING:
3164         case SNDRV_PCM_STATE_PREPARED:
3165         case SNDRV_PCM_STATE_PAUSED:
3166                 if (avail >= runtime->control->avail_min) {
3167                         mask = EPOLLOUT | EPOLLWRNORM;
3168                         break;
3169                 }
3170                 /* Fall through */
3171         case SNDRV_PCM_STATE_DRAINING:
3172                 mask = 0;
3173                 break;
3174         default:
3175                 mask = EPOLLOUT | EPOLLWRNORM | EPOLLERR;
3176                 break;
3177         }
3178         snd_pcm_stream_unlock_irq(substream);
3179         return mask;
3180 }
3181
3182 static __poll_t snd_pcm_capture_poll(struct file *file, poll_table * wait)
3183 {
3184         struct snd_pcm_file *pcm_file;
3185         struct snd_pcm_substream *substream;
3186         struct snd_pcm_runtime *runtime;
3187         __poll_t mask;
3188         snd_pcm_uframes_t avail;
3189
3190         pcm_file = file->private_data;
3191
3192         substream = pcm_file->substream;
3193         if (PCM_RUNTIME_CHECK(substream))
3194                 return EPOLLIN | EPOLLRDNORM | EPOLLERR;
3195         runtime = substream->runtime;
3196
3197         poll_wait(file, &runtime->sleep, wait);
3198
3199         snd_pcm_stream_lock_irq(substream);
3200         avail = snd_pcm_capture_avail(runtime);
3201         switch (runtime->status->state) {
3202         case SNDRV_PCM_STATE_RUNNING:
3203         case SNDRV_PCM_STATE_PREPARED:
3204         case SNDRV_PCM_STATE_PAUSED:
3205                 if (avail >= runtime->control->avail_min) {
3206                         mask = EPOLLIN | EPOLLRDNORM;
3207                         break;
3208                 }
3209                 mask = 0;
3210                 break;
3211         case SNDRV_PCM_STATE_DRAINING:
3212                 if (avail > 0) {
3213                         mask = EPOLLIN | EPOLLRDNORM;
3214                         break;
3215                 }
3216                 /* Fall through */
3217         default:
3218                 mask = EPOLLIN | EPOLLRDNORM | EPOLLERR;
3219                 break;
3220         }
3221         snd_pcm_stream_unlock_irq(substream);
3222         return mask;
3223 }
3224
3225 /*
3226  * mmap support
3227  */
3228
3229 /*
3230  * Only on coherent architectures, we can mmap the status and the control records
3231  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3232  */
3233 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3234 /*
3235  * mmap status record
3236  */
3237 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3238 {
3239         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3240         struct snd_pcm_runtime *runtime;
3241
3242         if (substream == NULL)
3243                 return VM_FAULT_SIGBUS;
3244         runtime = substream->runtime;
3245         vmf->page = virt_to_page(runtime->status);
3246         get_page(vmf->page);
3247         return 0;
3248 }
3249
3250 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3251 {
3252         .fault =        snd_pcm_mmap_status_fault,
3253 };
3254
3255 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3256                                struct vm_area_struct *area)
3257 {
3258         long size;
3259         if (!(area->vm_flags & VM_READ))
3260                 return -EINVAL;
3261         size = area->vm_end - area->vm_start;
3262         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3263                 return -EINVAL;
3264         area->vm_ops = &snd_pcm_vm_ops_status;
3265         area->vm_private_data = substream;
3266         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3267         return 0;
3268 }
3269
3270 /*
3271  * mmap control record
3272  */
3273 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3274 {
3275         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3276         struct snd_pcm_runtime *runtime;
3277
3278         if (substream == NULL)
3279                 return VM_FAULT_SIGBUS;
3280         runtime = substream->runtime;
3281         vmf->page = virt_to_page(runtime->control);
3282         get_page(vmf->page);
3283         return 0;
3284 }
3285
3286 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3287 {
3288         .fault =        snd_pcm_mmap_control_fault,
3289 };
3290
3291 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3292                                 struct vm_area_struct *area)
3293 {
3294         long size;
3295         if (!(area->vm_flags & VM_READ))
3296                 return -EINVAL;
3297         size = area->vm_end - area->vm_start;
3298         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3299                 return -EINVAL;
3300         area->vm_ops = &snd_pcm_vm_ops_control;
3301         area->vm_private_data = substream;
3302         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3303         return 0;
3304 }
3305
3306 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3307 {
3308         if (pcm_file->no_compat_mmap)
3309                 return false;
3310         /* See pcm_control_mmap_allowed() below.
3311          * Since older alsa-lib requires both status and control mmaps to be
3312          * coupled, we have to disable the status mmap for old alsa-lib, too.
3313          */
3314         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3315             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3316                 return false;
3317         return true;
3318 }
3319
3320 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3321 {
3322         if (pcm_file->no_compat_mmap)
3323                 return false;
3324         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3325          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3326          * thus it effectively assures the manual update of appl_ptr.
3327          */
3328         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3329                 return false;
3330         return true;
3331 }
3332
3333 #else /* ! coherent mmap */
3334 /*
3335  * don't support mmap for status and control records.
3336  */
3337 #define pcm_status_mmap_allowed(pcm_file)       false
3338 #define pcm_control_mmap_allowed(pcm_file)      false
3339
3340 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3341                                struct vm_area_struct *area)
3342 {
3343         return -ENXIO;
3344 }
3345 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3346                                 struct vm_area_struct *area)
3347 {
3348         return -ENXIO;
3349 }
3350 #endif /* coherent mmap */
3351
3352 static inline struct page *
3353 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3354 {
3355         void *vaddr = substream->runtime->dma_area + ofs;
3356         return virt_to_page(vaddr);
3357 }
3358
3359 /*
3360  * fault callback for mmapping a RAM page
3361  */
3362 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3363 {
3364         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3365         struct snd_pcm_runtime *runtime;
3366         unsigned long offset;
3367         struct page * page;
3368         size_t dma_bytes;
3369
3370         if (substream == NULL)
3371                 return VM_FAULT_SIGBUS;
3372         runtime = substream->runtime;
3373         offset = vmf->pgoff << PAGE_SHIFT;
3374         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3375         if (offset > dma_bytes - PAGE_SIZE)
3376                 return VM_FAULT_SIGBUS;
3377         if (substream->ops->page)
3378                 page = substream->ops->page(substream, offset);
3379         else
3380                 page = snd_pcm_default_page_ops(substream, offset);
3381         if (!page)
3382                 return VM_FAULT_SIGBUS;
3383         get_page(page);
3384         vmf->page = page;
3385         return 0;
3386 }
3387
3388 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3389         .open =         snd_pcm_mmap_data_open,
3390         .close =        snd_pcm_mmap_data_close,
3391 };
3392
3393 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3394         .open =         snd_pcm_mmap_data_open,
3395         .close =        snd_pcm_mmap_data_close,
3396         .fault =        snd_pcm_mmap_data_fault,
3397 };
3398
3399 /*
3400  * mmap the DMA buffer on RAM
3401  */
3402
3403 /**
3404  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3405  * @substream: PCM substream
3406  * @area: VMA
3407  *
3408  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3409  * this function is invoked implicitly.
3410  */
3411 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3412                              struct vm_area_struct *area)
3413 {
3414         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3415 #ifdef CONFIG_GENERIC_ALLOCATOR
3416         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3417                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3418                 return remap_pfn_range(area, area->vm_start,
3419                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3420                                 area->vm_end - area->vm_start, area->vm_page_prot);
3421         }
3422 #endif /* CONFIG_GENERIC_ALLOCATOR */
3423 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3424         if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3425             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3426                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3427                                          area,
3428                                          substream->runtime->dma_area,
3429                                          substream->runtime->dma_addr,
3430                                          substream->runtime->dma_bytes);
3431 #endif /* CONFIG_X86 */
3432         /* mmap with fault handler */
3433         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3434         return 0;
3435 }
3436 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3437
3438 /*
3439  * mmap the DMA buffer on I/O memory area
3440  */
3441 #if SNDRV_PCM_INFO_MMAP_IOMEM
3442 /**
3443  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3444  * @substream: PCM substream
3445  * @area: VMA
3446  *
3447  * When your hardware uses the iomapped pages as the hardware buffer and
3448  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3449  * is supposed to work only on limited architectures.
3450  */
3451 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3452                            struct vm_area_struct *area)
3453 {
3454         struct snd_pcm_runtime *runtime = substream->runtime;
3455
3456         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3457         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3458 }
3459 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3460 #endif /* SNDRV_PCM_INFO_MMAP */
3461
3462 /*
3463  * mmap DMA buffer
3464  */
3465 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3466                       struct vm_area_struct *area)
3467 {
3468         struct snd_pcm_runtime *runtime;
3469         long size;
3470         unsigned long offset;
3471         size_t dma_bytes;
3472         int err;
3473
3474         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3475                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3476                         return -EINVAL;
3477         } else {
3478                 if (!(area->vm_flags & VM_READ))
3479                         return -EINVAL;
3480         }
3481         runtime = substream->runtime;
3482         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3483                 return -EBADFD;
3484         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3485                 return -ENXIO;
3486         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3487             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3488                 return -EINVAL;
3489         size = area->vm_end - area->vm_start;
3490         offset = area->vm_pgoff << PAGE_SHIFT;
3491         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3492         if ((size_t)size > dma_bytes)
3493                 return -EINVAL;
3494         if (offset > dma_bytes - size)
3495                 return -EINVAL;
3496
3497         area->vm_ops = &snd_pcm_vm_ops_data;
3498         area->vm_private_data = substream;
3499         if (substream->ops->mmap)
3500                 err = substream->ops->mmap(substream, area);
3501         else
3502                 err = snd_pcm_lib_default_mmap(substream, area);
3503         if (!err)
3504                 atomic_inc(&substream->mmap_count);
3505         return err;
3506 }
3507 EXPORT_SYMBOL(snd_pcm_mmap_data);
3508
3509 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3510 {
3511         struct snd_pcm_file * pcm_file;
3512         struct snd_pcm_substream *substream;
3513         unsigned long offset;
3514
3515         pcm_file = file->private_data;
3516         substream = pcm_file->substream;
3517         if (PCM_RUNTIME_CHECK(substream))
3518                 return -ENXIO;
3519
3520         offset = area->vm_pgoff << PAGE_SHIFT;
3521         switch (offset) {
3522         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3523                 if (!pcm_status_mmap_allowed(pcm_file))
3524                         return -ENXIO;
3525                 return snd_pcm_mmap_status(substream, file, area);
3526         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3527                 if (!pcm_control_mmap_allowed(pcm_file))
3528                         return -ENXIO;
3529                 return snd_pcm_mmap_control(substream, file, area);
3530         default:
3531                 return snd_pcm_mmap_data(substream, file, area);
3532         }
3533         return 0;
3534 }
3535
3536 static int snd_pcm_fasync(int fd, struct file * file, int on)
3537 {
3538         struct snd_pcm_file * pcm_file;
3539         struct snd_pcm_substream *substream;
3540         struct snd_pcm_runtime *runtime;
3541
3542         pcm_file = file->private_data;
3543         substream = pcm_file->substream;
3544         if (PCM_RUNTIME_CHECK(substream))
3545                 return -ENXIO;
3546         runtime = substream->runtime;
3547         return fasync_helper(fd, file, on, &runtime->fasync);
3548 }
3549
3550 /*
3551  * ioctl32 compat
3552  */
3553 #ifdef CONFIG_COMPAT
3554 #include "pcm_compat.c"
3555 #else
3556 #define snd_pcm_ioctl_compat    NULL
3557 #endif
3558
3559 /*
3560  *  To be removed helpers to keep binary compatibility
3561  */
3562
3563 #ifdef CONFIG_SND_SUPPORT_OLD_API
3564 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3565 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3566
3567 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3568                                                struct snd_pcm_hw_params_old *oparams)
3569 {
3570         unsigned int i;
3571
3572         memset(params, 0, sizeof(*params));
3573         params->flags = oparams->flags;
3574         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3575                 params->masks[i].bits[0] = oparams->masks[i];
3576         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3577         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3578         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3579         params->info = oparams->info;
3580         params->msbits = oparams->msbits;
3581         params->rate_num = oparams->rate_num;
3582         params->rate_den = oparams->rate_den;
3583         params->fifo_size = oparams->fifo_size;
3584 }
3585
3586 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3587                                              struct snd_pcm_hw_params *params)
3588 {
3589         unsigned int i;
3590
3591         memset(oparams, 0, sizeof(*oparams));
3592         oparams->flags = params->flags;
3593         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3594                 oparams->masks[i] = params->masks[i].bits[0];
3595         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3596         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3597         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3598         oparams->info = params->info;
3599         oparams->msbits = params->msbits;
3600         oparams->rate_num = params->rate_num;
3601         oparams->rate_den = params->rate_den;
3602         oparams->fifo_size = params->fifo_size;
3603 }
3604
3605 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3606                                       struct snd_pcm_hw_params_old __user * _oparams)
3607 {
3608         struct snd_pcm_hw_params *params;
3609         struct snd_pcm_hw_params_old *oparams = NULL;
3610         int err;
3611
3612         params = kmalloc(sizeof(*params), GFP_KERNEL);
3613         if (!params)
3614                 return -ENOMEM;
3615
3616         oparams = memdup_user(_oparams, sizeof(*oparams));
3617         if (IS_ERR(oparams)) {
3618                 err = PTR_ERR(oparams);
3619                 goto out;
3620         }
3621         snd_pcm_hw_convert_from_old_params(params, oparams);
3622         err = snd_pcm_hw_refine(substream, params);
3623         if (err < 0)
3624                 goto out_old;
3625
3626         err = fixup_unreferenced_params(substream, params);
3627         if (err < 0)
3628                 goto out_old;
3629
3630         snd_pcm_hw_convert_to_old_params(oparams, params);
3631         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3632                 err = -EFAULT;
3633 out_old:
3634         kfree(oparams);
3635 out:
3636         kfree(params);
3637         return err;
3638 }
3639
3640 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3641                                       struct snd_pcm_hw_params_old __user * _oparams)
3642 {
3643         struct snd_pcm_hw_params *params;
3644         struct snd_pcm_hw_params_old *oparams = NULL;
3645         int err;
3646
3647         params = kmalloc(sizeof(*params), GFP_KERNEL);
3648         if (!params)
3649                 return -ENOMEM;
3650
3651         oparams = memdup_user(_oparams, sizeof(*oparams));
3652         if (IS_ERR(oparams)) {
3653                 err = PTR_ERR(oparams);
3654                 goto out;
3655         }
3656
3657         snd_pcm_hw_convert_from_old_params(params, oparams);
3658         err = snd_pcm_hw_params(substream, params);
3659         if (err < 0)
3660                 goto out_old;
3661
3662         snd_pcm_hw_convert_to_old_params(oparams, params);
3663         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3664                 err = -EFAULT;
3665 out_old:
3666         kfree(oparams);
3667 out:
3668         kfree(params);
3669         return err;
3670 }
3671 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3672
3673 #ifndef CONFIG_MMU
3674 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3675                                                unsigned long addr,
3676                                                unsigned long len,
3677                                                unsigned long pgoff,
3678                                                unsigned long flags)
3679 {
3680         struct snd_pcm_file *pcm_file = file->private_data;
3681         struct snd_pcm_substream *substream = pcm_file->substream;
3682         struct snd_pcm_runtime *runtime = substream->runtime;
3683         unsigned long offset = pgoff << PAGE_SHIFT;
3684
3685         switch (offset) {
3686         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3687                 return (unsigned long)runtime->status;
3688         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3689                 return (unsigned long)runtime->control;
3690         default:
3691                 return (unsigned long)runtime->dma_area + offset;
3692         }
3693 }
3694 #else
3695 # define snd_pcm_get_unmapped_area NULL
3696 #endif
3697
3698 /*
3699  *  Register section
3700  */
3701
3702 const struct file_operations snd_pcm_f_ops[2] = {
3703         {
3704                 .owner =                THIS_MODULE,
3705                 .write =                snd_pcm_write,
3706                 .write_iter =           snd_pcm_writev,
3707                 .open =                 snd_pcm_playback_open,
3708                 .release =              snd_pcm_release,
3709                 .llseek =               no_llseek,
3710                 .poll =                 snd_pcm_playback_poll,
3711                 .unlocked_ioctl =       snd_pcm_ioctl,
3712                 .compat_ioctl =         snd_pcm_ioctl_compat,
3713                 .mmap =                 snd_pcm_mmap,
3714                 .fasync =               snd_pcm_fasync,
3715                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3716         },
3717         {
3718                 .owner =                THIS_MODULE,
3719                 .read =                 snd_pcm_read,
3720                 .read_iter =            snd_pcm_readv,
3721                 .open =                 snd_pcm_capture_open,
3722                 .release =              snd_pcm_release,
3723                 .llseek =               no_llseek,
3724                 .poll =                 snd_pcm_capture_poll,
3725                 .unlocked_ioctl =       snd_pcm_ioctl,
3726                 .compat_ioctl =         snd_pcm_ioctl_compat,
3727                 .mmap =                 snd_pcm_mmap,
3728                 .fasync =               snd_pcm_fasync,
3729                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3730         }
3731 };