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/time.h>
  27 #include <linux/pm_qos.h>
  28 #include <linux/aio.h>
  29 #include <linux/dma-mapping.h>
  30 #include <sound/core.h>
  31 #include <sound/control.h>
  32 #include <sound/info.h>
  33 #include <sound/pcm.h>
  34 #include <sound/pcm_params.h>
  35 #include <sound/timer.h>
  36 #include <sound/minors.h>
  37 #include <asm/io.h>
  38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
  39 #include <dma-coherence.h>
  40 #endif
  41
  42 /*
  43  *  Compatibility
  44  */
  45
  46 struct snd_pcm_hw_params_old {
  47         unsigned int flags;
  48         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  49                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  50         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  51                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  52         unsigned int rmask;
  53         unsigned int cmask;
  54         unsigned int info;
  55         unsigned int msbits;
  56         unsigned int rate_num;
  57         unsigned int rate_den;
  58         snd_pcm_uframes_t fifo_size;
  59         unsigned char reserved[64];
  60 };
  61
  62 #ifdef CONFIG_SND_SUPPORT_OLD_API
  63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  65
  66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  69                                       struct snd_pcm_hw_params_old __user * _oparams);
  70 #endif
  71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  72
  73 /*
  74  *
  75  */
  76
  77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  79
  80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  81
  82 static inline mm_segment_t snd_enter_user(void)
  83 {
  84         mm_segment_t fs = get_fs();
  85         set_fs(get_ds());
  86         return fs;
  87 }
  88
  89 static inline void snd_leave_user(mm_segment_t fs)
  90 {
  91         set_fs(fs);
  92 }
  93
  94
  95
  96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  97 {
  98         struct snd_pcm_runtime *runtime;
  99         struct snd_pcm *pcm = substream->pcm;
 100         struct snd_pcm_str *pstr = substream->pstr;
 101
 102         memset(info, 0, sizeof(*info));
 103         info->card = pcm->card->number;
 104         info->device = pcm->device;
 105         info->stream = substream->stream;
 106         info->subdevice = substream->number;
 107         strlcpy(info->id, pcm->id, sizeof(info->id));
 108         strlcpy(info->name, pcm->name, sizeof(info->name));
 109         info->dev_class = pcm->dev_class;
 110         info->dev_subclass = pcm->dev_subclass;
 111         info->subdevices_count = pstr->substream_count;
 112         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 113         strlcpy(info->subname, substream->name, sizeof(info->subname));
 114         runtime = substream->runtime;
 115         /* AB: FIXME!!! This is definitely nonsense */
 116         if (runtime) {
 117                 info->sync = runtime->sync;
 118                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 119         }
 120         return 0;
 121 }
 122
 123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 124                       struct snd_pcm_info __user * _info)
 125 {
 126         struct snd_pcm_info *info;
 127         int err;
 128
 129         info = kmalloc(sizeof(*info), GFP_KERNEL);
 130         if (! info)
 131                 return -ENOMEM;
 132         err = snd_pcm_info(substream, info);
 133         if (err >= 0) {
 134                 if (copy_to_user(_info, info, sizeof(*info)))
 135                         err = -EFAULT;
 136         }
 137         kfree(info);
 138         return err;
 139 }
 140
 141 #undef RULES_DEBUG
 142
 143 #ifdef RULES_DEBUG
 144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 145 static const char * const snd_pcm_hw_param_names[] = {
 146         HW_PARAM(ACCESS),
 147         HW_PARAM(FORMAT),
 148         HW_PARAM(SUBFORMAT),
 149         HW_PARAM(SAMPLE_BITS),
 150         HW_PARAM(FRAME_BITS),
 151         HW_PARAM(CHANNELS),
 152         HW_PARAM(RATE),
 153         HW_PARAM(PERIOD_TIME),
 154         HW_PARAM(PERIOD_SIZE),
 155         HW_PARAM(PERIOD_BYTES),
 156         HW_PARAM(PERIODS),
 157         HW_PARAM(BUFFER_TIME),
 158         HW_PARAM(BUFFER_SIZE),
 159         HW_PARAM(BUFFER_BYTES),
 160         HW_PARAM(TICK_TIME),
 161 };
 162 #endif
 163
 164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 165                       struct snd_pcm_hw_params *params)
 166 {
 167         unsigned int k;
 168         struct snd_pcm_hardware *hw;
 169         struct snd_interval *i = NULL;
 170         struct snd_mask *m = NULL;
 171         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 172         unsigned int rstamps[constrs->rules_num];
 173         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 174         unsigned int stamp = 2;
 175         int changed, again;
 176
 177         params->info = 0;
 178         params->fifo_size = 0;
 179         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 180                 params->msbits = 0;
 181         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 182                 params->rate_num = 0;
 183                 params->rate_den = 0;
 184         }
 185
 186         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 187                 m = hw_param_mask(params, k);
 188                 if (snd_mask_empty(m))
 189                         return -EINVAL;
 190                 if (!(params->rmask & (1 << k)))
 191                         continue;
 192 #ifdef RULES_DEBUG
 193                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
 194                 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 197 #ifdef RULES_DEBUG
 198                 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 199 #endif
 200                 if (changed)
 201                         params->cmask |= 1 << k;
 202                 if (changed < 0)
 203                         return changed;
 204         }
 205
 206         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 207                 i = hw_param_interval(params, k);
 208                 if (snd_interval_empty(i))
 209                         return -EINVAL;
 210                 if (!(params->rmask & (1 << k)))
 211                         continue;
 212 #ifdef RULES_DEBUG
 213                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
 214                 if (i->empty)
 215                         pr_cont("empty");
 216                 else
 217                         pr_cont("%c%u %u%c",
 218                                i->openmin ? '(' : '[', i->min,
 219                                i->max, i->openmax ? ')' : ']');
 220                 pr_cont(" -> ");
 221 #endif
 222                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 223 #ifdef RULES_DEBUG
 224                 if (i->empty)
 225                         pr_cont("empty\n");
 226                 else
 227                         pr_cont("%c%u %u%c\n",
 228                                i->openmin ? '(' : '[', i->min,
 229                                i->max, i->openmax ? ')' : ']');
 230 #endif
 231                 if (changed)
 232                         params->cmask |= 1 << k;
 233                 if (changed < 0)
 234                         return changed;
 235         }
 236
 237         for (k = 0; k < constrs->rules_num; k++)
 238                 rstamps[k] = 0;
 239         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 240                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 241         do {
 242                 again = 0;
 243                 for (k = 0; k < constrs->rules_num; k++) {
 244                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 245                         unsigned int d;
 246                         int doit = 0;
 247                         if (r->cond && !(r->cond & params->flags))
 248                                 continue;
 249                         for (d = 0; r->deps[d] >= 0; d++) {
 250                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 251                                         doit = 1;
 252                                         break;
 253                                 }
 254                         }
 255                         if (!doit)
 256                                 continue;
 257 #ifdef RULES_DEBUG
 258                         pr_debug("Rule %d [%p]: ", k, r->func);
 259                         if (r->var >= 0) {
 260                                 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
 261                                 if (hw_is_mask(r->var)) {
 262                                         m = hw_param_mask(params, r->var);
 263                                         pr_cont("%x", *m->bits);
 264                                 } else {
 265                                         i = hw_param_interval(params, r->var);
 266                                         if (i->empty)
 267                                                 pr_cont("empty");
 268                                         else
 269                                                 pr_cont("%c%u %u%c",
 270                                                        i->openmin ? '(' : '[', i->min,
 271                                                        i->max, i->openmax ? ')' : ']');
 272                                 }
 273                         }
 274 #endif
 275                         changed = r->func(params, r);
 276 #ifdef RULES_DEBUG
 277                         if (r->var >= 0) {
 278                                 pr_cont(" -> ");
 279                                 if (hw_is_mask(r->var))
 280                                         pr_cont("%x", *m->bits);
 281                                 else {
 282                                         if (i->empty)
 283                                                 pr_cont("empty");
 284                                         else
 285                                                 pr_cont("%c%u %u%c",
 286                                                        i->openmin ? '(' : '[', i->min,
 287                                                        i->max, i->openmax ? ')' : ']');
 288                                 }
 289                         }
 290                         pr_cont("\n");
 291 #endif
 292                         rstamps[k] = stamp;
 293                         if (changed && r->var >= 0) {
 294                                 params->cmask |= (1 << r->var);
 295                                 vstamps[r->var] = stamp;
 296                                 again = 1;
 297                         }
 298                         if (changed < 0)
 299                                 return changed;
 300                         stamp++;
 301                 }
 302         } while (again);
 303         if (!params->msbits) {
 304                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 305                 if (snd_interval_single(i))
 306                         params->msbits = snd_interval_value(i);
 307         }
 308
 309         if (!params->rate_den) {
 310                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 311                 if (snd_interval_single(i)) {
 312                         params->rate_num = snd_interval_value(i);
 313                         params->rate_den = 1;
 314                 }
 315         }
 316
 317         hw = &substream->runtime->hw;
 318         if (!params->info)
 319                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 320         if (!params->fifo_size) {
 321                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 322                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 323                 if (snd_mask_min(m) == snd_mask_max(m) &&
 324                     snd_interval_min(i) == snd_interval_max(i)) {
 325                         changed = substream->ops->ioctl(substream,
 326                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 327                         if (changed < 0)
 328                                 return changed;
 329                 }
 330         }
 331         params->rmask = 0;
 332         return 0;
 333 }
 334
 335 EXPORT_SYMBOL(snd_pcm_hw_refine);
 336
 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 338                                   struct snd_pcm_hw_params __user * _params)
 339 {
 340         struct snd_pcm_hw_params *params;
 341         int err;
 342
 343         params = memdup_user(_params, sizeof(*params));
 344         if (IS_ERR(params))
 345                 return PTR_ERR(params);
 346
 347         err = snd_pcm_hw_refine(substream, params);
 348         if (copy_to_user(_params, params, sizeof(*params))) {
 349                 if (!err)
 350                         err = -EFAULT;
 351         }
 352
 353         kfree(params);
 354         return err;
 355 }
 356
 357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 358 {
 359         int usecs;
 360
 361         if (! runtime->rate)
 362                 return -1; /* invalid */
 363
 364         /* take 75% of period time as the deadline */
 365         usecs = (750000 / runtime->rate) * runtime->period_size;
 366         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 367                 runtime->rate;
 368
 369         return usecs;
 370 }
 371
 372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
 373 {
 374         snd_pcm_stream_lock_irq(substream);
 375         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
 376                 substream->runtime->status->state = state;
 377         snd_pcm_stream_unlock_irq(substream);
 378 }
 379
 380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 381                              struct snd_pcm_hw_params *params)
 382 {
 383         struct snd_pcm_runtime *runtime;
 384         int err, usecs;
 385         unsigned int bits;
 386         snd_pcm_uframes_t frames;
 387
 388         if (PCM_RUNTIME_CHECK(substream))
 389                 return -ENXIO;
 390         runtime = substream->runtime;
 391         snd_pcm_stream_lock_irq(substream);
 392         switch (runtime->status->state) {
 393         case SNDRV_PCM_STATE_OPEN:
 394         case SNDRV_PCM_STATE_SETUP:
 395         case SNDRV_PCM_STATE_PREPARED:
 396                 break;
 397         default:
 398                 snd_pcm_stream_unlock_irq(substream);
 399                 return -EBADFD;
 400         }
 401         snd_pcm_stream_unlock_irq(substream);
 402 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 403         if (!substream->oss.oss)
 404 #endif
 405                 if (atomic_read(&substream->mmap_count))
 406                         return -EBADFD;
 407
 408         params->rmask = ~0U;
 409         err = snd_pcm_hw_refine(substream, params);
 410         if (err < 0)
 411                 goto _error;
 412
 413         err = snd_pcm_hw_params_choose(substream, params);
 414         if (err < 0)
 415                 goto _error;
 416
 417         if (substream->ops->hw_params != NULL) {
 418                 err = substream->ops->hw_params(substream, params);
 419                 if (err < 0)
 420                         goto _error;
 421         }
 422
 423         runtime->access = params_access(params);
 424         runtime->format = params_format(params);
 425         runtime->subformat = params_subformat(params);
 426         runtime->channels = params_channels(params);
 427         runtime->rate = params_rate(params);
 428         runtime->period_size = params_period_size(params);
 429         runtime->periods = params_periods(params);
 430         runtime->buffer_size = params_buffer_size(params);
 431         runtime->info = params->info;
 432         runtime->rate_num = params->rate_num;
 433         runtime->rate_den = params->rate_den;
 434         runtime->no_period_wakeup =
 435                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 436                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 437
 438         bits = snd_pcm_format_physical_width(runtime->format);
 439         runtime->sample_bits = bits;
 440         bits *= runtime->channels;
 441         runtime->frame_bits = bits;
 442         frames = 1;
 443         while (bits % 8 != 0) {
 444                 bits *= 2;
 445                 frames *= 2;
 446         }
 447         runtime->byte_align = bits / 8;
 448         runtime->min_align = frames;
 449
 450         /* Default sw params */
 451         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 452         runtime->period_step = 1;
 453         runtime->control->avail_min = runtime->period_size;
 454         runtime->start_threshold = 1;
 455         runtime->stop_threshold = runtime->buffer_size;
 456         runtime->silence_threshold = 0;
 457         runtime->silence_size = 0;
 458         runtime->boundary = runtime->buffer_size;
 459         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 460                 runtime->boundary *= 2;
 461
 462         snd_pcm_timer_resolution_change(substream);
 463         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 464
 465         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 466                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 467         if ((usecs = period_to_usecs(runtime)) >= 0)
 468                 pm_qos_add_request(&substream->latency_pm_qos_req,
 469                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 470         return 0;
 471  _error:
 472         /* hardware might be unusable from this time,
 473            so we force application to retry to set
 474            the correct hardware parameter settings */
 475         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 476         if (substream->ops->hw_free != NULL)
 477                 substream->ops->hw_free(substream);
 478         return err;
 479 }
 480
 481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 482                                   struct snd_pcm_hw_params __user * _params)
 483 {
 484         struct snd_pcm_hw_params *params;
 485         int err;
 486
 487         params = memdup_user(_params, sizeof(*params));
 488         if (IS_ERR(params))
 489                 return PTR_ERR(params);
 490
 491         err = snd_pcm_hw_params(substream, params);
 492         if (copy_to_user(_params, params, sizeof(*params))) {
 493                 if (!err)
 494                         err = -EFAULT;
 495         }
 496
 497         kfree(params);
 498         return err;
 499 }
 500
 501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 502 {
 503         struct snd_pcm_runtime *runtime;
 504         int result = 0;
 505
 506         if (PCM_RUNTIME_CHECK(substream))
 507                 return -ENXIO;
 508         runtime = substream->runtime;
 509         snd_pcm_stream_lock_irq(substream);
 510         switch (runtime->status->state) {
 511         case SNDRV_PCM_STATE_SETUP:
 512         case SNDRV_PCM_STATE_PREPARED:
 513                 break;
 514         default:
 515                 snd_pcm_stream_unlock_irq(substream);
 516                 return -EBADFD;
 517         }
 518         snd_pcm_stream_unlock_irq(substream);
 519         if (atomic_read(&substream->mmap_count))
 520                 return -EBADFD;
 521         if (substream->ops->hw_free)
 522                 result = substream->ops->hw_free(substream);
 523         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 524         pm_qos_remove_request(&substream->latency_pm_qos_req);
 525         return result;
 526 }
 527
 528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 529                              struct snd_pcm_sw_params *params)
 530 {
 531         struct snd_pcm_runtime *runtime;
 532         int err;
 533
 534         if (PCM_RUNTIME_CHECK(substream))
 535                 return -ENXIO;
 536         runtime = substream->runtime;
 537         snd_pcm_stream_lock_irq(substream);
 538         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 539                 snd_pcm_stream_unlock_irq(substream);
 540                 return -EBADFD;
 541         }
 542         snd_pcm_stream_unlock_irq(substream);
 543
 544         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 545                 return -EINVAL;
 546         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 547             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 548                 return -EINVAL;
 549         if (params->avail_min == 0)
 550                 return -EINVAL;
 551         if (params->silence_size >= runtime->boundary) {
 552                 if (params->silence_threshold != 0)
 553                         return -EINVAL;
 554         } else {
 555                 if (params->silence_size > params->silence_threshold)
 556                         return -EINVAL;
 557                 if (params->silence_threshold > runtime->buffer_size)
 558                         return -EINVAL;
 559         }
 560         err = 0;
 561         snd_pcm_stream_lock_irq(substream);
 562         runtime->tstamp_mode = params->tstamp_mode;
 563         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 564                 runtime->tstamp_type = params->tstamp_type;
 565         runtime->period_step = params->period_step;
 566         runtime->control->avail_min = params->avail_min;
 567         runtime->start_threshold = params->start_threshold;
 568         runtime->stop_threshold = params->stop_threshold;
 569         runtime->silence_threshold = params->silence_threshold;
 570         runtime->silence_size = params->silence_size;
 571         params->boundary = runtime->boundary;
 572         if (snd_pcm_running(substream)) {
 573                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 574                     runtime->silence_size > 0)
 575                         snd_pcm_playback_silence(substream, ULONG_MAX);
 576                 err = snd_pcm_update_state(substream, runtime);
 577         }
 578         snd_pcm_stream_unlock_irq(substream);
 579         return err;
 580 }
 581
 582 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 583                                   struct snd_pcm_sw_params __user * _params)
 584 {
 585         struct snd_pcm_sw_params params;
 586         int err;
 587         if (copy_from_user(&params, _params, sizeof(params)))
 588                 return -EFAULT;
 589         err = snd_pcm_sw_params(substream, &params);
 590         if (copy_to_user(_params, &params, sizeof(params)))
 591                 return -EFAULT;
 592         return err;
 593 }
 594
 595 int snd_pcm_status(struct snd_pcm_substream *substream,
 596                    struct snd_pcm_status *status)
 597 {
 598         struct snd_pcm_runtime *runtime = substream->runtime;
 599
 600         snd_pcm_stream_lock_irq(substream);
 601         status->state = runtime->status->state;
 602         status->suspended_state = runtime->status->suspended_state;
 603         if (status->state == SNDRV_PCM_STATE_OPEN)
 604                 goto _end;
 605         status->trigger_tstamp = runtime->trigger_tstamp;
 606         if (snd_pcm_running(substream)) {
 607                 snd_pcm_update_hw_ptr(substream);
 608                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 609                         status->tstamp = runtime->status->tstamp;
 610                         status->audio_tstamp =
 611                                 runtime->status->audio_tstamp;
 612                         goto _tstamp_end;
 613                 }
 614         }
 615         snd_pcm_gettime(runtime, &status->tstamp);
 616  _tstamp_end:
 617         status->appl_ptr = runtime->control->appl_ptr;
 618         status->hw_ptr = runtime->status->hw_ptr;
 619         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 620                 status->avail = snd_pcm_playback_avail(runtime);
 621                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 622                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 623                         status->delay = runtime->buffer_size - status->avail;
 624                         status->delay += runtime->delay;
 625                 } else
 626                         status->delay = 0;
 627         } else {
 628                 status->avail = snd_pcm_capture_avail(runtime);
 629                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 630                         status->delay = status->avail + runtime->delay;
 631                 else
 632                         status->delay = 0;
 633         }
 634         status->avail_max = runtime->avail_max;
 635         status->overrange = runtime->overrange;
 636         runtime->avail_max = 0;
 637         runtime->overrange = 0;
 638  _end:
 639         snd_pcm_stream_unlock_irq(substream);
 640         return 0;
 641 }
 642
 643 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 644                                struct snd_pcm_status __user * _status)
 645 {
 646         struct snd_pcm_status status;
 647         int res;
 648
 649         memset(&status, 0, sizeof(status));
 650         res = snd_pcm_status(substream, &status);
 651         if (res < 0)
 652                 return res;
 653         if (copy_to_user(_status, &status, sizeof(status)))
 654                 return -EFAULT;
 655         return 0;
 656 }
 657
 658 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 659                                 struct snd_pcm_channel_info * info)
 660 {
 661         struct snd_pcm_runtime *runtime;
 662         unsigned int channel;
 663
 664         channel = info->channel;
 665         runtime = substream->runtime;
 666         snd_pcm_stream_lock_irq(substream);
 667         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 668                 snd_pcm_stream_unlock_irq(substream);
 669                 return -EBADFD;
 670         }
 671         snd_pcm_stream_unlock_irq(substream);
 672         if (channel >= runtime->channels)
 673                 return -EINVAL;
 674         memset(info, 0, sizeof(*info));
 675         info->channel = channel;
 676         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 677 }
 678
 679 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 680                                      struct snd_pcm_channel_info __user * _info)
 681 {
 682         struct snd_pcm_channel_info info;
 683         int res;
 684
 685         if (copy_from_user(&info, _info, sizeof(info)))
 686                 return -EFAULT;
 687         res = snd_pcm_channel_info(substream, &info);
 688         if (res < 0)
 689                 return res;
 690         if (copy_to_user(_info, &info, sizeof(info)))
 691                 return -EFAULT;
 692         return 0;
 693 }
 694
 695 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 696 {
 697         struct snd_pcm_runtime *runtime = substream->runtime;
 698         if (runtime->trigger_master == NULL)
 699                 return;
 700         if (runtime->trigger_master == substream) {
 701                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 702         } else {
 703                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 704                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 705         }
 706         runtime->trigger_master = NULL;
 707 }
 708
 709 struct action_ops {
 710         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 711         int (*do_action)(struct snd_pcm_substream *substream, int state);
 712         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 713         void (*post_action)(struct snd_pcm_substream *substream, int state);
 714 };
 715
 716 /*
 717  *  this functions is core for handling of linked stream
 718  *  Note: the stream state might be changed also on failure
 719  *  Note2: call with calling stream lock + link lock
 720  */
 721 static int snd_pcm_action_group(struct action_ops *ops,
 722                                 struct snd_pcm_substream *substream,
 723                                 int state, int do_lock)
 724 {
 725         struct snd_pcm_substream *s = NULL;
 726         struct snd_pcm_substream *s1;
 727         int res = 0;
 728
 729         snd_pcm_group_for_each_entry(s, substream) {
 730                 if (do_lock && s != substream)
 731                         spin_lock_nested(&s->self_group.lock,
 732                                          SINGLE_DEPTH_NESTING);
 733                 res = ops->pre_action(s, state);
 734                 if (res < 0)
 735                         goto _unlock;
 736         }
 737         snd_pcm_group_for_each_entry(s, substream) {
 738                 res = ops->do_action(s, state);
 739                 if (res < 0) {
 740                         if (ops->undo_action) {
 741                                 snd_pcm_group_for_each_entry(s1, substream) {
 742                                         if (s1 == s) /* failed stream */
 743                                                 break;
 744                                         ops->undo_action(s1, state);
 745                                 }
 746                         }
 747                         s = NULL; /* unlock all */
 748                         goto _unlock;
 749                 }
 750         }
 751         snd_pcm_group_for_each_entry(s, substream) {
 752                 ops->post_action(s, state);
 753         }
 754  _unlock:
 755         if (do_lock) {
 756                 /* unlock streams */
 757                 snd_pcm_group_for_each_entry(s1, substream) {
 758                         if (s1 != substream)
 759                                 spin_unlock(&s1->self_group.lock);
 760                         if (s1 == s)    /* end */
 761                                 break;
 762                 }
 763         }
 764         return res;
 765 }
 766
 767 /*
 768  *  Note: call with stream lock
 769  */
 770 static int snd_pcm_action_single(struct action_ops *ops,
 771                                  struct snd_pcm_substream *substream,
 772                                  int state)
 773 {
 774         int res;
 775
 776         res = ops->pre_action(substream, state);
 777         if (res < 0)
 778                 return res;
 779         res = ops->do_action(substream, state);
 780         if (res == 0)
 781                 ops->post_action(substream, state);
 782         else if (ops->undo_action)
 783                 ops->undo_action(substream, state);
 784         return res;
 785 }
 786
 787 /*
 788  *  Note: call with stream lock
 789  */
 790 static int snd_pcm_action(struct action_ops *ops,
 791                           struct snd_pcm_substream *substream,
 792                           int state)
 793 {
 794         int res;
 795
 796         if (snd_pcm_stream_linked(substream)) {
 797                 if (!spin_trylock(&substream->group->lock)) {
 798                         spin_unlock(&substream->self_group.lock);
 799                         spin_lock(&substream->group->lock);
 800                         spin_lock(&substream->self_group.lock);
 801                 }
 802                 res = snd_pcm_action_group(ops, substream, state, 1);
 803                 spin_unlock(&substream->group->lock);
 804         } else {
 805                 res = snd_pcm_action_single(ops, substream, state);
 806         }
 807         return res;
 808 }
 809
 810 /*
 811  *  Note: don't use any locks before
 812  */
 813 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 814                                    struct snd_pcm_substream *substream,
 815                                    int state)
 816 {
 817         int res;
 818
 819         read_lock_irq(&snd_pcm_link_rwlock);
 820         if (snd_pcm_stream_linked(substream)) {
 821                 spin_lock(&substream->group->lock);
 822                 spin_lock(&substream->self_group.lock);
 823                 res = snd_pcm_action_group(ops, substream, state, 1);
 824                 spin_unlock(&substream->self_group.lock);
 825                 spin_unlock(&substream->group->lock);
 826         } else {
 827                 spin_lock(&substream->self_group.lock);
 828                 res = snd_pcm_action_single(ops, substream, state);
 829                 spin_unlock(&substream->self_group.lock);
 830         }
 831         read_unlock_irq(&snd_pcm_link_rwlock);
 832         return res;
 833 }
 834
 835 /*
 836  */
 837 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 838                                     struct snd_pcm_substream *substream,
 839                                     int state)
 840 {
 841         int res;
 842
 843         down_read(&snd_pcm_link_rwsem);
 844         if (snd_pcm_stream_linked(substream))
 845                 res = snd_pcm_action_group(ops, substream, state, 0);
 846         else
 847                 res = snd_pcm_action_single(ops, substream, state);
 848         up_read(&snd_pcm_link_rwsem);
 849         return res;
 850 }
 851
 852 /*
 853  * start callbacks
 854  */
 855 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 856 {
 857         struct snd_pcm_runtime *runtime = substream->runtime;
 858         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 859                 return -EBADFD;
 860         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 861             !snd_pcm_playback_data(substream))
 862                 return -EPIPE;
 863         runtime->trigger_master = substream;
 864         return 0;
 865 }
 866
 867 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 868 {
 869         if (substream->runtime->trigger_master != substream)
 870                 return 0;
 871         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 872 }
 873
 874 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 875 {
 876         if (substream->runtime->trigger_master == substream)
 877                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 878 }
 879
 880 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 881 {
 882         struct snd_pcm_runtime *runtime = substream->runtime;
 883         snd_pcm_trigger_tstamp(substream);
 884         runtime->hw_ptr_jiffies = jiffies;
 885         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
 886                                                             runtime->rate;
 887         runtime->status->state = state;
 888         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 889             runtime->silence_size > 0)
 890                 snd_pcm_playback_silence(substream, ULONG_MAX);
 891         if (substream->timer)
 892                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 893                                  &runtime->trigger_tstamp);
 894 }
 895
 896 static struct action_ops snd_pcm_action_start = {
 897         .pre_action = snd_pcm_pre_start,
 898         .do_action = snd_pcm_do_start,
 899         .undo_action = snd_pcm_undo_start,
 900         .post_action = snd_pcm_post_start
 901 };
 902
 903 /**
 904  * snd_pcm_start - start all linked streams
 905  * @substream: the PCM substream instance
 906  *
 907  * Return: Zero if successful, or a negative error code.
 908  */
 909 int snd_pcm_start(struct snd_pcm_substream *substream)
 910 {
 911         return snd_pcm_action(&snd_pcm_action_start, substream,
 912                               SNDRV_PCM_STATE_RUNNING);
 913 }
 914
 915 /*
 916  * stop callbacks
 917  */
 918 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 919 {
 920         struct snd_pcm_runtime *runtime = substream->runtime;
 921         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 922                 return -EBADFD;
 923         runtime->trigger_master = substream;
 924         return 0;
 925 }
 926
 927 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 928 {
 929         if (substream->runtime->trigger_master == substream &&
 930             snd_pcm_running(substream))
 931                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 932         return 0; /* unconditonally stop all substreams */
 933 }
 934
 935 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 936 {
 937         struct snd_pcm_runtime *runtime = substream->runtime;
 938         if (runtime->status->state != state) {
 939                 snd_pcm_trigger_tstamp(substream);
 940                 if (substream->timer)
 941                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 942                                          &runtime->trigger_tstamp);
 943                 runtime->status->state = state;
 944         }
 945         wake_up(&runtime->sleep);
 946         wake_up(&runtime->tsleep);
 947 }
 948
 949 static struct action_ops snd_pcm_action_stop = {
 950         .pre_action = snd_pcm_pre_stop,
 951         .do_action = snd_pcm_do_stop,
 952         .post_action = snd_pcm_post_stop
 953 };
 954
 955 /**
 956  * snd_pcm_stop - try to stop all running streams in the substream group
 957  * @substream: the PCM substream instance
 958  * @state: PCM state after stopping the stream
 959  *
 960  * The state of each stream is then changed to the given state unconditionally.
 961  *
 962  * Return: Zero if successful, or a negative error code.
 963  */
 964 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
 965 {
 966         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 967 }
 968
 969 EXPORT_SYMBOL(snd_pcm_stop);
 970
 971 /**
 972  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 973  * @substream: the PCM substream
 974  *
 975  * After stopping, the state is changed to SETUP.
 976  * Unlike snd_pcm_stop(), this affects only the given stream.
 977  *
 978  * Return: Zero if succesful, or a negative error code.
 979  */
 980 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 981 {
 982         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 983                                      SNDRV_PCM_STATE_SETUP);
 984 }
 985
 986 /*
 987  * pause callbacks
 988  */
 989 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 990 {
 991         struct snd_pcm_runtime *runtime = substream->runtime;
 992         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 993                 return -ENOSYS;
 994         if (push) {
 995                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 996                         return -EBADFD;
 997         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 998                 return -EBADFD;
 999         runtime->trigger_master = substream;
1000         return 0;
1001 }
1002
1003 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1004 {
1005         if (substream->runtime->trigger_master != substream)
1006                 return 0;
1007         /* some drivers might use hw_ptr to recover from the pause -
1008            update the hw_ptr now */
1009         if (push)
1010                 snd_pcm_update_hw_ptr(substream);
1011         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1012          * a delta between the current jiffies, this gives a large enough
1013          * delta, effectively to skip the check once.
1014          */
1015         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1016         return substream->ops->trigger(substream,
1017                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1018                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1019 }
1020
1021 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1022 {
1023         if (substream->runtime->trigger_master == substream)
1024                 substream->ops->trigger(substream,
1025                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1026                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1027 }
1028
1029 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1030 {
1031         struct snd_pcm_runtime *runtime = substream->runtime;
1032         snd_pcm_trigger_tstamp(substream);
1033         if (push) {
1034                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1035                 if (substream->timer)
1036                         snd_timer_notify(substream->timer,
1037                                          SNDRV_TIMER_EVENT_MPAUSE,
1038                                          &runtime->trigger_tstamp);
1039                 wake_up(&runtime->sleep);
1040                 wake_up(&runtime->tsleep);
1041         } else {
1042                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1043                 if (substream->timer)
1044                         snd_timer_notify(substream->timer,
1045                                          SNDRV_TIMER_EVENT_MCONTINUE,
1046                                          &runtime->trigger_tstamp);
1047         }
1048 }
1049
1050 static struct action_ops snd_pcm_action_pause = {
1051         .pre_action = snd_pcm_pre_pause,
1052         .do_action = snd_pcm_do_pause,
1053         .undo_action = snd_pcm_undo_pause,
1054         .post_action = snd_pcm_post_pause
1055 };
1056
1057 /*
1058  * Push/release the pause for all linked streams.
1059  */
1060 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1061 {
1062         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1063 }
1064
1065 #ifdef CONFIG_PM
1066 /* suspend */
1067
1068 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1069 {
1070         struct snd_pcm_runtime *runtime = substream->runtime;
1071         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1072                 return -EBUSY;
1073         runtime->trigger_master = substream;
1074         return 0;
1075 }
1076
1077 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1078 {
1079         struct snd_pcm_runtime *runtime = substream->runtime;
1080         if (runtime->trigger_master != substream)
1081                 return 0;
1082         if (! snd_pcm_running(substream))
1083                 return 0;
1084         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1085         return 0; /* suspend unconditionally */
1086 }
1087
1088 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1089 {
1090         struct snd_pcm_runtime *runtime = substream->runtime;
1091         snd_pcm_trigger_tstamp(substream);
1092         if (substream->timer)
1093                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1094                                  &runtime->trigger_tstamp);
1095         runtime->status->suspended_state = runtime->status->state;
1096         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1097         wake_up(&runtime->sleep);
1098         wake_up(&runtime->tsleep);
1099 }
1100
1101 static struct action_ops snd_pcm_action_suspend = {
1102         .pre_action = snd_pcm_pre_suspend,
1103         .do_action = snd_pcm_do_suspend,
1104         .post_action = snd_pcm_post_suspend
1105 };
1106
1107 /**
1108  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1109  * @substream: the PCM substream
1110  *
1111  * After this call, all streams are changed to SUSPENDED state.
1112  *
1113  * Return: Zero if successful (or @substream is %NULL), or a negative error
1114  * code.
1115  */
1116 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1117 {
1118         int err;
1119         unsigned long flags;
1120
1121         if (! substream)
1122                 return 0;
1123
1124         snd_pcm_stream_lock_irqsave(substream, flags);
1125         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1126         snd_pcm_stream_unlock_irqrestore(substream, flags);
1127         return err;
1128 }
1129
1130 EXPORT_SYMBOL(snd_pcm_suspend);
1131
1132 /**
1133  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1134  * @pcm: the PCM instance
1135  *
1136  * After this call, all streams are changed to SUSPENDED state.
1137  *
1138  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1139  */
1140 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1141 {
1142         struct snd_pcm_substream *substream;
1143         int stream, err = 0;
1144
1145         if (! pcm)
1146                 return 0;
1147
1148         for (stream = 0; stream < 2; stream++) {
1149                 for (substream = pcm->streams[stream].substream;
1150                      substream; substream = substream->next) {
1151                         /* FIXME: the open/close code should lock this as well */
1152                         if (substream->runtime == NULL)
1153                                 continue;
1154                         err = snd_pcm_suspend(substream);
1155                         if (err < 0 && err != -EBUSY)
1156                                 return err;
1157                 }
1158         }
1159         return 0;
1160 }
1161
1162 EXPORT_SYMBOL(snd_pcm_suspend_all);
1163
1164 /* resume */
1165
1166 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1167 {
1168         struct snd_pcm_runtime *runtime = substream->runtime;
1169         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1170                 return -ENOSYS;
1171         runtime->trigger_master = substream;
1172         return 0;
1173 }
1174
1175 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1176 {
1177         struct snd_pcm_runtime *runtime = substream->runtime;
1178         if (runtime->trigger_master != substream)
1179                 return 0;
1180         /* DMA not running previously? */
1181         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1182             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1183              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1184                 return 0;
1185         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1186 }
1187
1188 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1189 {
1190         if (substream->runtime->trigger_master == substream &&
1191             snd_pcm_running(substream))
1192                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1193 }
1194
1195 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1196 {
1197         struct snd_pcm_runtime *runtime = substream->runtime;
1198         snd_pcm_trigger_tstamp(substream);
1199         if (substream->timer)
1200                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1201                                  &runtime->trigger_tstamp);
1202         runtime->status->state = runtime->status->suspended_state;
1203 }
1204
1205 static struct action_ops snd_pcm_action_resume = {
1206         .pre_action = snd_pcm_pre_resume,
1207         .do_action = snd_pcm_do_resume,
1208         .undo_action = snd_pcm_undo_resume,
1209         .post_action = snd_pcm_post_resume
1210 };
1211
1212 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1213 {
1214         struct snd_card *card = substream->pcm->card;
1215         int res;
1216
1217         snd_power_lock(card);
1218         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1219                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1220         snd_power_unlock(card);
1221         return res;
1222 }
1223
1224 #else
1225
1226 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1227 {
1228         return -ENOSYS;
1229 }
1230
1231 #endif /* CONFIG_PM */
1232
1233 /*
1234  * xrun ioctl
1235  *
1236  * Change the RUNNING stream(s) to XRUN state.
1237  */
1238 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1239 {
1240         struct snd_card *card = substream->pcm->card;
1241         struct snd_pcm_runtime *runtime = substream->runtime;
1242         int result;
1243
1244         snd_power_lock(card);
1245         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1246                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1247                 if (result < 0)
1248                         goto _unlock;
1249         }
1250
1251         snd_pcm_stream_lock_irq(substream);
1252         switch (runtime->status->state) {
1253         case SNDRV_PCM_STATE_XRUN:
1254                 result = 0;     /* already there */
1255                 break;
1256         case SNDRV_PCM_STATE_RUNNING:
1257                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1258                 break;
1259         default:
1260                 result = -EBADFD;
1261         }
1262         snd_pcm_stream_unlock_irq(substream);
1263  _unlock:
1264         snd_power_unlock(card);
1265         return result;
1266 }
1267
1268 /*
1269  * reset ioctl
1270  */
1271 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1272 {
1273         struct snd_pcm_runtime *runtime = substream->runtime;
1274         switch (runtime->status->state) {
1275         case SNDRV_PCM_STATE_RUNNING:
1276         case SNDRV_PCM_STATE_PREPARED:
1277         case SNDRV_PCM_STATE_PAUSED:
1278         case SNDRV_PCM_STATE_SUSPENDED:
1279                 return 0;
1280         default:
1281                 return -EBADFD;
1282         }
1283 }
1284
1285 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1286 {
1287         struct snd_pcm_runtime *runtime = substream->runtime;
1288         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1289         if (err < 0)
1290                 return err;
1291         runtime->hw_ptr_base = 0;
1292         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1293                 runtime->status->hw_ptr % runtime->period_size;
1294         runtime->silence_start = runtime->status->hw_ptr;
1295         runtime->silence_filled = 0;
1296         return 0;
1297 }
1298
1299 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1300 {
1301         struct snd_pcm_runtime *runtime = substream->runtime;
1302         runtime->control->appl_ptr = runtime->status->hw_ptr;
1303         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1304             runtime->silence_size > 0)
1305                 snd_pcm_playback_silence(substream, ULONG_MAX);
1306 }
1307
1308 static struct action_ops snd_pcm_action_reset = {
1309         .pre_action = snd_pcm_pre_reset,
1310         .do_action = snd_pcm_do_reset,
1311         .post_action = snd_pcm_post_reset
1312 };
1313
1314 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1315 {
1316         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1317 }
1318
1319 /*
1320  * prepare ioctl
1321  */
1322 /* we use the second argument for updating f_flags */
1323 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1324                                int f_flags)
1325 {
1326         struct snd_pcm_runtime *runtime = substream->runtime;
1327         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1328             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1329                 return -EBADFD;
1330         if (snd_pcm_running(substream))
1331                 return -EBUSY;
1332         substream->f_flags = f_flags;
1333         return 0;
1334 }
1335
1336 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1337 {
1338         int err;
1339         err = substream->ops->prepare(substream);
1340         if (err < 0)
1341                 return err;
1342         return snd_pcm_do_reset(substream, 0);
1343 }
1344
1345 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1346 {
1347         struct snd_pcm_runtime *runtime = substream->runtime;
1348         runtime->control->appl_ptr = runtime->status->hw_ptr;
1349         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1350 }
1351
1352 static struct action_ops snd_pcm_action_prepare = {
1353         .pre_action = snd_pcm_pre_prepare,
1354         .do_action = snd_pcm_do_prepare,
1355         .post_action = snd_pcm_post_prepare
1356 };
1357
1358 /**
1359  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1360  * @substream: the PCM substream instance
1361  * @file: file to refer f_flags
1362  *
1363  * Return: Zero if successful, or a negative error code.
1364  */
1365 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1366                            struct file *file)
1367 {
1368         int res;
1369         struct snd_card *card = substream->pcm->card;
1370         int f_flags;
1371
1372         if (file)
1373                 f_flags = file->f_flags;
1374         else
1375                 f_flags = substream->f_flags;
1376
1377         snd_power_lock(card);
1378         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1379                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1380                                                substream, f_flags);
1381         snd_power_unlock(card);
1382         return res;
1383 }
1384
1385 /*
1386  * drain ioctl
1387  */
1388
1389 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1390 {
1391         struct snd_pcm_runtime *runtime = substream->runtime;
1392         switch (runtime->status->state) {
1393         case SNDRV_PCM_STATE_OPEN:
1394         case SNDRV_PCM_STATE_DISCONNECTED:
1395         case SNDRV_PCM_STATE_SUSPENDED:
1396                 return -EBADFD;
1397         }
1398         runtime->trigger_master = substream;
1399         return 0;
1400 }
1401
1402 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1403 {
1404         struct snd_pcm_runtime *runtime = substream->runtime;
1405         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1406                 switch (runtime->status->state) {
1407                 case SNDRV_PCM_STATE_PREPARED:
1408                         /* start playback stream if possible */
1409                         if (! snd_pcm_playback_empty(substream)) {
1410                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1411                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1412                         }
1413                         break;
1414                 case SNDRV_PCM_STATE_RUNNING:
1415                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1416                         break;
1417                 case SNDRV_PCM_STATE_XRUN:
1418                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1419                         break;
1420                 default:
1421                         break;
1422                 }
1423         } else {
1424                 /* stop running stream */
1425                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1426                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1427                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1428                         snd_pcm_do_stop(substream, new_state);
1429                         snd_pcm_post_stop(substream, new_state);
1430                 }
1431         }
1432         return 0;
1433 }
1434
1435 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1436 {
1437 }
1438
1439 static struct action_ops snd_pcm_action_drain_init = {
1440         .pre_action = snd_pcm_pre_drain_init,
1441         .do_action = snd_pcm_do_drain_init,
1442         .post_action = snd_pcm_post_drain_init
1443 };
1444
1445 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1446
1447 /*
1448  * Drain the stream(s).
1449  * When the substream is linked, sync until the draining of all playback streams
1450  * is finished.
1451  * After this call, all streams are supposed to be either SETUP or DRAINING
1452  * (capture only) state.
1453  */
1454 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1455                          struct file *file)
1456 {
1457         struct snd_card *card;
1458         struct snd_pcm_runtime *runtime;
1459         struct snd_pcm_substream *s;
1460         wait_queue_t wait;
1461         int result = 0;
1462         int nonblock = 0;
1463
1464         card = substream->pcm->card;
1465         runtime = substream->runtime;
1466
1467         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1468                 return -EBADFD;
1469
1470         snd_power_lock(card);
1471         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1472                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1473                 if (result < 0) {
1474                         snd_power_unlock(card);
1475                         return result;
1476                 }
1477         }
1478
1479         if (file) {
1480                 if (file->f_flags & O_NONBLOCK)
1481                         nonblock = 1;
1482         } else if (substream->f_flags & O_NONBLOCK)
1483                 nonblock = 1;
1484
1485         down_read(&snd_pcm_link_rwsem);
1486         snd_pcm_stream_lock_irq(substream);
1487         /* resume pause */
1488         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1489                 snd_pcm_pause(substream, 0);
1490
1491         /* pre-start/stop - all running streams are changed to DRAINING state */
1492         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1493         if (result < 0)
1494                 goto unlock;
1495         /* in non-blocking, we don't wait in ioctl but let caller poll */
1496         if (nonblock) {
1497                 result = -EAGAIN;
1498                 goto unlock;
1499         }
1500
1501         for (;;) {
1502                 long tout;
1503                 struct snd_pcm_runtime *to_check;
1504                 if (signal_pending(current)) {
1505                         result = -ERESTARTSYS;
1506                         break;
1507                 }
1508                 /* find a substream to drain */
1509                 to_check = NULL;
1510                 snd_pcm_group_for_each_entry(s, substream) {
1511                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1512                                 continue;
1513                         runtime = s->runtime;
1514                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1515                                 to_check = runtime;
1516                                 break;
1517                         }
1518                 }
1519                 if (!to_check)
1520                         break; /* all drained */
1521                 init_waitqueue_entry(&wait, current);
1522                 add_wait_queue(&to_check->sleep, &wait);
1523                 snd_pcm_stream_unlock_irq(substream);
1524                 up_read(&snd_pcm_link_rwsem);
1525                 snd_power_unlock(card);
1526                 if (runtime->no_period_wakeup)
1527                         tout = MAX_SCHEDULE_TIMEOUT;
1528                 else {
1529                         tout = 10;
1530                         if (runtime->rate) {
1531                                 long t = runtime->period_size * 2 / runtime->rate;
1532                                 tout = max(t, tout);
1533                         }
1534                         tout = msecs_to_jiffies(tout * 1000);
1535                 }
1536                 tout = schedule_timeout_interruptible(tout);
1537                 snd_power_lock(card);
1538                 down_read(&snd_pcm_link_rwsem);
1539                 snd_pcm_stream_lock_irq(substream);
1540                 remove_wait_queue(&to_check->sleep, &wait);
1541                 if (card->shutdown) {
1542                         result = -ENODEV;
1543                         break;
1544                 }
1545                 if (tout == 0) {
1546                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1547                                 result = -ESTRPIPE;
1548                         else {
1549                                 dev_dbg(substream->pcm->card->dev,
1550                                         "playback drain error (DMA or IRQ trouble?)\n");
1551                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1552                                 result = -EIO;
1553                         }
1554                         break;
1555                 }
1556         }
1557
1558  unlock:
1559         snd_pcm_stream_unlock_irq(substream);
1560         up_read(&snd_pcm_link_rwsem);
1561         snd_power_unlock(card);
1562
1563         return result;
1564 }
1565
1566 /*
1567  * drop ioctl
1568  *
1569  * Immediately put all linked substreams into SETUP state.
1570  */
1571 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1572 {
1573         struct snd_pcm_runtime *runtime;
1574         int result = 0;
1575
1576         if (PCM_RUNTIME_CHECK(substream))
1577                 return -ENXIO;
1578         runtime = substream->runtime;
1579
1580         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1581             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1582             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1583                 return -EBADFD;
1584
1585         snd_pcm_stream_lock_irq(substream);
1586         /* resume pause */
1587         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1588                 snd_pcm_pause(substream, 0);
1589
1590         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1591         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1592         snd_pcm_stream_unlock_irq(substream);
1593
1594         return result;
1595 }
1596
1597
1598 static bool is_pcm_file(struct file *file)
1599 {
1600         struct inode *inode = file_inode(file);
1601         unsigned int minor;
1602
1603         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1604                 return false;
1605         minor = iminor(inode);
1606         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1607                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1608 }
1609
1610 /*
1611  * PCM link handling
1612  */
1613 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1614 {
1615         int res = 0;
1616         struct snd_pcm_file *pcm_file;
1617         struct snd_pcm_substream *substream1;
1618         struct snd_pcm_group *group;
1619         struct fd f = fdget(fd);
1620
1621         if (!f.file)
1622                 return -EBADFD;
1623         if (!is_pcm_file(f.file)) {
1624                 res = -EBADFD;
1625                 goto _badf;
1626         }
1627         pcm_file = f.file->private_data;
1628         substream1 = pcm_file->substream;
1629         group = kmalloc(sizeof(*group), GFP_KERNEL);
1630         if (!group) {
1631                 res = -ENOMEM;
1632                 goto _nolock;
1633         }
1634         down_write(&snd_pcm_link_rwsem);
1635         write_lock_irq(&snd_pcm_link_rwlock);
1636         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1637             substream->runtime->status->state != substream1->runtime->status->state) {
1638                 res = -EBADFD;
1639                 goto _end;
1640         }
1641         if (snd_pcm_stream_linked(substream1)) {
1642                 res = -EALREADY;
1643                 goto _end;
1644         }
1645         if (!snd_pcm_stream_linked(substream)) {
1646                 substream->group = group;
1647                 group = NULL;
1648                 spin_lock_init(&substream->group->lock);
1649                 INIT_LIST_HEAD(&substream->group->substreams);
1650                 list_add_tail(&substream->link_list, &substream->group->substreams);
1651                 substream->group->count = 1;
1652         }
1653         list_add_tail(&substream1->link_list, &substream->group->substreams);
1654         substream->group->count++;
1655         substream1->group = substream->group;
1656  _end:
1657         write_unlock_irq(&snd_pcm_link_rwlock);
1658         up_write(&snd_pcm_link_rwsem);
1659  _nolock:
1660         snd_card_unref(substream1->pcm->card);
1661         kfree(group);
1662  _badf:
1663         fdput(f);
1664         return res;
1665 }
1666
1667 static void relink_to_local(struct snd_pcm_substream *substream)
1668 {
1669         substream->group = &substream->self_group;
1670         INIT_LIST_HEAD(&substream->self_group.substreams);
1671         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1672 }
1673
1674 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1675 {
1676         struct snd_pcm_substream *s;
1677         int res = 0;
1678
1679         down_write(&snd_pcm_link_rwsem);
1680         write_lock_irq(&snd_pcm_link_rwlock);
1681         if (!snd_pcm_stream_linked(substream)) {
1682                 res = -EALREADY;
1683                 goto _end;
1684         }
1685         list_del(&substream->link_list);
1686         substream->group->count--;
1687         if (substream->group->count == 1) {     /* detach the last stream, too */
1688                 snd_pcm_group_for_each_entry(s, substream) {
1689                         relink_to_local(s);
1690                         break;
1691                 }
1692                 kfree(substream->group);
1693         }
1694         relink_to_local(substream);
1695        _end:
1696         write_unlock_irq(&snd_pcm_link_rwlock);
1697         up_write(&snd_pcm_link_rwsem);
1698         return res;
1699 }
1700
1701 /*
1702  * hw configurator
1703  */
1704 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1705                                struct snd_pcm_hw_rule *rule)
1706 {
1707         struct snd_interval t;
1708         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1709                      hw_param_interval_c(params, rule->deps[1]), &t);
1710         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1711 }
1712
1713 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1714                                struct snd_pcm_hw_rule *rule)
1715 {
1716         struct snd_interval t;
1717         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1718                      hw_param_interval_c(params, rule->deps[1]), &t);
1719         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1720 }
1721
1722 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1723                                    struct snd_pcm_hw_rule *rule)
1724 {
1725         struct snd_interval t;
1726         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1727                          hw_param_interval_c(params, rule->deps[1]),
1728                          (unsigned long) rule->private, &t);
1729         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1730 }
1731
1732 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1733                                    struct snd_pcm_hw_rule *rule)
1734 {
1735         struct snd_interval t;
1736         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1737                          (unsigned long) rule->private,
1738                          hw_param_interval_c(params, rule->deps[1]), &t);
1739         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1740 }
1741
1742 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1743                                   struct snd_pcm_hw_rule *rule)
1744 {
1745         unsigned int k;
1746         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1747         struct snd_mask m;
1748         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1749         snd_mask_any(&m);
1750         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1751                 int bits;
1752                 if (! snd_mask_test(mask, k))
1753                         continue;
1754                 bits = snd_pcm_format_physical_width(k);
1755                 if (bits <= 0)
1756                         continue; /* ignore invalid formats */
1757                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1758                         snd_mask_reset(&m, k);
1759         }
1760         return snd_mask_refine(mask, &m);
1761 }
1762
1763 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1764                                        struct snd_pcm_hw_rule *rule)
1765 {
1766         struct snd_interval t;
1767         unsigned int k;
1768         t.min = UINT_MAX;
1769         t.max = 0;
1770         t.openmin = 0;
1771         t.openmax = 0;
1772         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1773                 int bits;
1774                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1775                         continue;
1776                 bits = snd_pcm_format_physical_width(k);
1777                 if (bits <= 0)
1778                         continue; /* ignore invalid formats */
1779                 if (t.min > (unsigned)bits)
1780                         t.min = bits;
1781                 if (t.max < (unsigned)bits)
1782                         t.max = bits;
1783         }
1784         t.integer = 1;
1785         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1786 }
1787
1788 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1789 #error "Change this table"
1790 #endif
1791
1792 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1793                                  48000, 64000, 88200, 96000, 176400, 192000 };
1794
1795 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1796         .count = ARRAY_SIZE(rates),
1797         .list = rates,
1798 };
1799
1800 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1801                                 struct snd_pcm_hw_rule *rule)
1802 {
1803         struct snd_pcm_hardware *hw = rule->private;
1804         return snd_interval_list(hw_param_interval(params, rule->var),
1805                                  snd_pcm_known_rates.count,
1806                                  snd_pcm_known_rates.list, hw->rates);
1807 }
1808
1809 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1810                                             struct snd_pcm_hw_rule *rule)
1811 {
1812         struct snd_interval t;
1813         struct snd_pcm_substream *substream = rule->private;
1814         t.min = 0;
1815         t.max = substream->buffer_bytes_max;
1816         t.openmin = 0;
1817         t.openmax = 0;
1818         t.integer = 1;
1819         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1820 }
1821
1822 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1823 {
1824         struct snd_pcm_runtime *runtime = substream->runtime;
1825         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1826         int k, err;
1827
1828         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1829                 snd_mask_any(constrs_mask(constrs, k));
1830         }
1831
1832         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1833                 snd_interval_any(constrs_interval(constrs, k));
1834         }
1835
1836         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1837         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1838         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1839         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1840         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1841
1842         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1843                                    snd_pcm_hw_rule_format, NULL,
1844                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1845         if (err < 0)
1846                 return err;
1847         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1848                                   snd_pcm_hw_rule_sample_bits, NULL,
1849                                   SNDRV_PCM_HW_PARAM_FORMAT,
1850                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1854                                   snd_pcm_hw_rule_div, NULL,
1855                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1856         if (err < 0)
1857                 return err;
1858         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859                                   snd_pcm_hw_rule_mul, NULL,
1860                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1861         if (err < 0)
1862                 return err;
1863         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1864                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1866         if (err < 0)
1867                 return err;
1868         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1869                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1870                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1871         if (err < 0)
1872                 return err;
1873         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1874                                   snd_pcm_hw_rule_div, NULL,
1875                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1876         if (err < 0)
1877                 return err;
1878         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1879                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1880                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1881         if (err < 0)
1882                 return err;
1883         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1884                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1885                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1886         if (err < 0)
1887                 return err;
1888         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1889                                   snd_pcm_hw_rule_div, NULL,
1890                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1891         if (err < 0)
1892                 return err;
1893         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894                                   snd_pcm_hw_rule_div, NULL,
1895                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1896         if (err < 0)
1897                 return err;
1898         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1899                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1900                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1901         if (err < 0)
1902                 return err;
1903         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1904                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1905                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1906         if (err < 0)
1907                 return err;
1908         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909                                   snd_pcm_hw_rule_mul, NULL,
1910                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1911         if (err < 0)
1912                 return err;
1913         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1914                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1915                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1916         if (err < 0)
1917                 return err;
1918         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1919                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1920                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1921         if (err < 0)
1922                 return err;
1923         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1924                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1925                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1926         if (err < 0)
1927                 return err;
1928         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1929                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1930                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1931         if (err < 0)
1932                 return err;
1933         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1934                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1935                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1936         if (err < 0)
1937                 return err;
1938         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1939                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1940                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1941         if (err < 0)
1942                 return err;
1943         return 0;
1944 }
1945
1946 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1947 {
1948         struct snd_pcm_runtime *runtime = substream->runtime;
1949         struct snd_pcm_hardware *hw = &runtime->hw;
1950         int err;
1951         unsigned int mask = 0;
1952
1953         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1954                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1955         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1956                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1957         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1958                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1959                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1960                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1961                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1962                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1963                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1964         }
1965         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1966         if (err < 0)
1967                 return err;
1968
1969         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1970         if (err < 0)
1971                 return err;
1972
1973         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1974         if (err < 0)
1975                 return err;
1976
1977         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1978                                            hw->channels_min, hw->channels_max);
1979         if (err < 0)
1980                 return err;
1981
1982         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1983                                            hw->rate_min, hw->rate_max);
1984         if (err < 0)
1985                 return err;
1986
1987         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1988                                            hw->period_bytes_min, hw->period_bytes_max);
1989         if (err < 0)
1990                 return err;
1991
1992         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1993                                            hw->periods_min, hw->periods_max);
1994         if (err < 0)
1995                 return err;
1996
1997         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1998                                            hw->period_bytes_min, hw->buffer_bytes_max);
1999         if (err < 0)
2000                 return err;
2001
2002         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2003                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2004                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2005         if (err < 0)
2006                 return err;
2007
2008         /* FIXME: remove */
2009         if (runtime->dma_bytes) {
2010                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2011                 if (err < 0)
2012                         return err;
2013         }
2014
2015         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2016                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2017                                           snd_pcm_hw_rule_rate, hw,
2018                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2019                 if (err < 0)
2020                         return err;
2021         }
2022
2023         /* FIXME: this belong to lowlevel */
2024         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2025
2026         return 0;
2027 }
2028
2029 static void pcm_release_private(struct snd_pcm_substream *substream)
2030 {
2031         snd_pcm_unlink(substream);
2032 }
2033
2034 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2035 {
2036         substream->ref_count--;
2037         if (substream->ref_count > 0)
2038                 return;
2039
2040         snd_pcm_drop(substream);
2041         if (substream->hw_opened) {
2042                 if (substream->ops->hw_free != NULL)
2043                         substream->ops->hw_free(substream);
2044                 substream->ops->close(substream);
2045                 substream->hw_opened = 0;
2046         }
2047         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2048                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2049         if (substream->pcm_release) {
2050                 substream->pcm_release(substream);
2051                 substream->pcm_release = NULL;
2052         }
2053         snd_pcm_detach_substream(substream);
2054 }
2055
2056 EXPORT_SYMBOL(snd_pcm_release_substream);
2057
2058 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2059                            struct file *file,
2060                            struct snd_pcm_substream **rsubstream)
2061 {
2062         struct snd_pcm_substream *substream;
2063         int err;
2064
2065         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2066         if (err < 0)
2067                 return err;
2068         if (substream->ref_count > 1) {
2069                 *rsubstream = substream;
2070                 return 0;
2071         }
2072
2073         err = snd_pcm_hw_constraints_init(substream);
2074         if (err < 0) {
2075                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2076                 goto error;
2077         }
2078
2079         if ((err = substream->ops->open(substream)) < 0)
2080                 goto error;
2081
2082         substream->hw_opened = 1;
2083
2084         err = snd_pcm_hw_constraints_complete(substream);
2085         if (err < 0) {
2086                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2087                 goto error;
2088         }
2089
2090         *rsubstream = substream;
2091         return 0;
2092
2093  error:
2094         snd_pcm_release_substream(substream);
2095         return err;
2096 }
2097
2098 EXPORT_SYMBOL(snd_pcm_open_substream);
2099
2100 static int snd_pcm_open_file(struct file *file,
2101                              struct snd_pcm *pcm,
2102                              int stream)
2103 {
2104         struct snd_pcm_file *pcm_file;
2105         struct snd_pcm_substream *substream;
2106         int err;
2107
2108         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2109         if (err < 0)
2110                 return err;
2111
2112         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2113         if (pcm_file == NULL) {
2114                 snd_pcm_release_substream(substream);
2115                 return -ENOMEM;
2116         }
2117         pcm_file->substream = substream;
2118         if (substream->ref_count == 1) {
2119                 substream->file = pcm_file;
2120                 substream->pcm_release = pcm_release_private;
2121         }
2122         file->private_data = pcm_file;
2123
2124         return 0;
2125 }
2126
2127 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2128 {
2129         struct snd_pcm *pcm;
2130         int err = nonseekable_open(inode, file);
2131         if (err < 0)
2132                 return err;
2133         pcm = snd_lookup_minor_data(iminor(inode),
2134                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2135         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2136         if (pcm)
2137                 snd_card_unref(pcm->card);
2138         return err;
2139 }
2140
2141 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2142 {
2143         struct snd_pcm *pcm;
2144         int err = nonseekable_open(inode, file);
2145         if (err < 0)
2146                 return err;
2147         pcm = snd_lookup_minor_data(iminor(inode),
2148                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2149         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2150         if (pcm)
2151                 snd_card_unref(pcm->card);
2152         return err;
2153 }
2154
2155 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2156 {
2157         int err;
2158         wait_queue_t wait;
2159
2160         if (pcm == NULL) {
2161                 err = -ENODEV;
2162                 goto __error1;
2163         }
2164         err = snd_card_file_add(pcm->card, file);
2165         if (err < 0)
2166                 goto __error1;
2167         if (!try_module_get(pcm->card->module)) {
2168                 err = -EFAULT;
2169                 goto __error2;
2170         }
2171         init_waitqueue_entry(&wait, current);
2172         add_wait_queue(&pcm->open_wait, &wait);
2173         mutex_lock(&pcm->open_mutex);
2174         while (1) {
2175                 err = snd_pcm_open_file(file, pcm, stream);
2176                 if (err >= 0)
2177                         break;
2178                 if (err == -EAGAIN) {
2179                         if (file->f_flags & O_NONBLOCK) {
2180                                 err = -EBUSY;
2181                                 break;
2182                         }
2183                 } else
2184                         break;
2185                 set_current_state(TASK_INTERRUPTIBLE);
2186                 mutex_unlock(&pcm->open_mutex);
2187                 schedule();
2188                 mutex_lock(&pcm->open_mutex);
2189                 if (pcm->card->shutdown) {
2190                         err = -ENODEV;
2191                         break;
2192                 }
2193                 if (signal_pending(current)) {
2194                         err = -ERESTARTSYS;
2195                         break;
2196                 }
2197         }
2198         remove_wait_queue(&pcm->open_wait, &wait);
2199         mutex_unlock(&pcm->open_mutex);
2200         if (err < 0)
2201                 goto __error;
2202         return err;
2203
2204       __error:
2205         module_put(pcm->card->module);
2206       __error2:
2207         snd_card_file_remove(pcm->card, file);
2208       __error1:
2209         return err;
2210 }
2211
2212 static int snd_pcm_release(struct inode *inode, struct file *file)
2213 {
2214         struct snd_pcm *pcm;
2215         struct snd_pcm_substream *substream;
2216         struct snd_pcm_file *pcm_file;
2217
2218         pcm_file = file->private_data;
2219         substream = pcm_file->substream;
2220         if (snd_BUG_ON(!substream))
2221                 return -ENXIO;
2222         pcm = substream->pcm;
2223         mutex_lock(&pcm->open_mutex);
2224         snd_pcm_release_substream(substream);
2225         kfree(pcm_file);
2226         mutex_unlock(&pcm->open_mutex);
2227         wake_up(&pcm->open_wait);
2228         module_put(pcm->card->module);
2229         snd_card_file_remove(pcm->card, file);
2230         return 0;
2231 }
2232
2233 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2234                                                  snd_pcm_uframes_t frames)
2235 {
2236         struct snd_pcm_runtime *runtime = substream->runtime;
2237         snd_pcm_sframes_t appl_ptr;
2238         snd_pcm_sframes_t ret;
2239         snd_pcm_sframes_t hw_avail;
2240
2241         if (frames == 0)
2242                 return 0;
2243
2244         snd_pcm_stream_lock_irq(substream);
2245         switch (runtime->status->state) {
2246         case SNDRV_PCM_STATE_PREPARED:
2247                 break;
2248         case SNDRV_PCM_STATE_DRAINING:
2249         case SNDRV_PCM_STATE_RUNNING:
2250                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2251                         break;
2252                 /* Fall through */
2253         case SNDRV_PCM_STATE_XRUN:
2254                 ret = -EPIPE;
2255                 goto __end;
2256         case SNDRV_PCM_STATE_SUSPENDED:
2257                 ret = -ESTRPIPE;
2258                 goto __end;
2259         default:
2260                 ret = -EBADFD;
2261                 goto __end;
2262         }
2263
2264         hw_avail = snd_pcm_playback_hw_avail(runtime);
2265         if (hw_avail <= 0) {
2266                 ret = 0;
2267                 goto __end;
2268         }
2269         if (frames > (snd_pcm_uframes_t)hw_avail)
2270                 frames = hw_avail;
2271         appl_ptr = runtime->control->appl_ptr - frames;
2272         if (appl_ptr < 0)
2273                 appl_ptr += runtime->boundary;
2274         runtime->control->appl_ptr = appl_ptr;
2275         ret = frames;
2276  __end:
2277         snd_pcm_stream_unlock_irq(substream);
2278         return ret;
2279 }
2280
2281 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2282                                                 snd_pcm_uframes_t frames)
2283 {
2284         struct snd_pcm_runtime *runtime = substream->runtime;
2285         snd_pcm_sframes_t appl_ptr;
2286         snd_pcm_sframes_t ret;
2287         snd_pcm_sframes_t hw_avail;
2288
2289         if (frames == 0)
2290                 return 0;
2291
2292         snd_pcm_stream_lock_irq(substream);
2293         switch (runtime->status->state) {
2294         case SNDRV_PCM_STATE_PREPARED:
2295         case SNDRV_PCM_STATE_DRAINING:
2296                 break;
2297         case SNDRV_PCM_STATE_RUNNING:
2298                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2299                         break;
2300                 /* Fall through */
2301         case SNDRV_PCM_STATE_XRUN:
2302                 ret = -EPIPE;
2303                 goto __end;
2304         case SNDRV_PCM_STATE_SUSPENDED:
2305                 ret = -ESTRPIPE;
2306                 goto __end;
2307         default:
2308                 ret = -EBADFD;
2309                 goto __end;
2310         }
2311
2312         hw_avail = snd_pcm_capture_hw_avail(runtime);
2313         if (hw_avail <= 0) {
2314                 ret = 0;
2315                 goto __end;
2316         }
2317         if (frames > (snd_pcm_uframes_t)hw_avail)
2318                 frames = hw_avail;
2319         appl_ptr = runtime->control->appl_ptr - frames;
2320         if (appl_ptr < 0)
2321                 appl_ptr += runtime->boundary;
2322         runtime->control->appl_ptr = appl_ptr;
2323         ret = frames;
2324  __end:
2325         snd_pcm_stream_unlock_irq(substream);
2326         return ret;
2327 }
2328
2329 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2330                                                   snd_pcm_uframes_t frames)
2331 {
2332         struct snd_pcm_runtime *runtime = substream->runtime;
2333         snd_pcm_sframes_t appl_ptr;
2334         snd_pcm_sframes_t ret;
2335         snd_pcm_sframes_t avail;
2336
2337         if (frames == 0)
2338                 return 0;
2339
2340         snd_pcm_stream_lock_irq(substream);
2341         switch (runtime->status->state) {
2342         case SNDRV_PCM_STATE_PREPARED:
2343         case SNDRV_PCM_STATE_PAUSED:
2344                 break;
2345         case SNDRV_PCM_STATE_DRAINING:
2346         case SNDRV_PCM_STATE_RUNNING:
2347                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2348                         break;
2349                 /* Fall through */
2350         case SNDRV_PCM_STATE_XRUN:
2351                 ret = -EPIPE;
2352                 goto __end;
2353         case SNDRV_PCM_STATE_SUSPENDED:
2354                 ret = -ESTRPIPE;
2355                 goto __end;
2356         default:
2357                 ret = -EBADFD;
2358                 goto __end;
2359         }
2360
2361         avail = snd_pcm_playback_avail(runtime);
2362         if (avail <= 0) {
2363                 ret = 0;
2364                 goto __end;
2365         }
2366         if (frames > (snd_pcm_uframes_t)avail)
2367                 frames = avail;
2368         appl_ptr = runtime->control->appl_ptr + frames;
2369         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2370                 appl_ptr -= runtime->boundary;
2371         runtime->control->appl_ptr = appl_ptr;
2372         ret = frames;
2373  __end:
2374         snd_pcm_stream_unlock_irq(substream);
2375         return ret;
2376 }
2377
2378 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2379                                                  snd_pcm_uframes_t frames)
2380 {
2381         struct snd_pcm_runtime *runtime = substream->runtime;
2382         snd_pcm_sframes_t appl_ptr;
2383         snd_pcm_sframes_t ret;
2384         snd_pcm_sframes_t avail;
2385
2386         if (frames == 0)
2387                 return 0;
2388
2389         snd_pcm_stream_lock_irq(substream);
2390         switch (runtime->status->state) {
2391         case SNDRV_PCM_STATE_PREPARED:
2392         case SNDRV_PCM_STATE_DRAINING:
2393         case SNDRV_PCM_STATE_PAUSED:
2394                 break;
2395         case SNDRV_PCM_STATE_RUNNING:
2396                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2397                         break;
2398                 /* Fall through */
2399         case SNDRV_PCM_STATE_XRUN:
2400                 ret = -EPIPE;
2401                 goto __end;
2402         case SNDRV_PCM_STATE_SUSPENDED:
2403                 ret = -ESTRPIPE;
2404                 goto __end;
2405         default:
2406                 ret = -EBADFD;
2407                 goto __end;
2408         }
2409
2410         avail = snd_pcm_capture_avail(runtime);
2411         if (avail <= 0) {
2412                 ret = 0;
2413                 goto __end;
2414         }
2415         if (frames > (snd_pcm_uframes_t)avail)
2416                 frames = avail;
2417         appl_ptr = runtime->control->appl_ptr + frames;
2418         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2419                 appl_ptr -= runtime->boundary;
2420         runtime->control->appl_ptr = appl_ptr;
2421         ret = frames;
2422  __end:
2423         snd_pcm_stream_unlock_irq(substream);
2424         return ret;
2425 }
2426
2427 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2428 {
2429         struct snd_pcm_runtime *runtime = substream->runtime;
2430         int err;
2431
2432         snd_pcm_stream_lock_irq(substream);
2433         switch (runtime->status->state) {
2434         case SNDRV_PCM_STATE_DRAINING:
2435                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2436                         goto __badfd;
2437                 /* Fall through */
2438         case SNDRV_PCM_STATE_RUNNING:
2439                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2440                         break;
2441                 /* Fall through */
2442         case SNDRV_PCM_STATE_PREPARED:
2443         case SNDRV_PCM_STATE_SUSPENDED:
2444                 err = 0;
2445                 break;
2446         case SNDRV_PCM_STATE_XRUN:
2447                 err = -EPIPE;
2448                 break;
2449         default:
2450               __badfd:
2451                 err = -EBADFD;
2452                 break;
2453         }
2454         snd_pcm_stream_unlock_irq(substream);
2455         return err;
2456 }
2457
2458 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2459                          snd_pcm_sframes_t __user *res)
2460 {
2461         struct snd_pcm_runtime *runtime = substream->runtime;
2462         int err;
2463         snd_pcm_sframes_t n = 0;
2464
2465         snd_pcm_stream_lock_irq(substream);
2466         switch (runtime->status->state) {
2467         case SNDRV_PCM_STATE_DRAINING:
2468                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2469                         goto __badfd;
2470                 /* Fall through */
2471         case SNDRV_PCM_STATE_RUNNING:
2472                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2473                         break;
2474                 /* Fall through */
2475         case SNDRV_PCM_STATE_PREPARED:
2476         case SNDRV_PCM_STATE_SUSPENDED:
2477                 err = 0;
2478                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2479                         n = snd_pcm_playback_hw_avail(runtime);
2480                 else
2481                         n = snd_pcm_capture_avail(runtime);
2482                 n += runtime->delay;
2483                 break;
2484         case SNDRV_PCM_STATE_XRUN:
2485                 err = -EPIPE;
2486                 break;
2487         default:
2488               __badfd:
2489                 err = -EBADFD;
2490                 break;
2491         }
2492         snd_pcm_stream_unlock_irq(substream);
2493         if (!err)
2494                 if (put_user(n, res))
2495                         err = -EFAULT;
2496         return err;
2497 }
2498
2499 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2500                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2501 {
2502         struct snd_pcm_runtime *runtime = substream->runtime;
2503         struct snd_pcm_sync_ptr sync_ptr;
2504         volatile struct snd_pcm_mmap_status *status;
2505         volatile struct snd_pcm_mmap_control *control;
2506         int err;
2507
2508         memset(&sync_ptr, 0, sizeof(sync_ptr));
2509         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2510                 return -EFAULT;
2511         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2512                 return -EFAULT;
2513         status = runtime->status;
2514         control = runtime->control;
2515         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2516                 err = snd_pcm_hwsync(substream);
2517                 if (err < 0)
2518                         return err;
2519         }
2520         snd_pcm_stream_lock_irq(substream);
2521         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2522                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2523         else
2524                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2525         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2526                 control->avail_min = sync_ptr.c.control.avail_min;
2527         else
2528                 sync_ptr.c.control.avail_min = control->avail_min;
2529         sync_ptr.s.status.state = status->state;
2530         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2531         sync_ptr.s.status.tstamp = status->tstamp;
2532         sync_ptr.s.status.suspended_state = status->suspended_state;
2533         snd_pcm_stream_unlock_irq(substream);
2534         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2535                 return -EFAULT;
2536         return 0;
2537 }
2538
2539 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2540 {
2541         struct snd_pcm_runtime *runtime = substream->runtime;
2542         int arg;
2543
2544         if (get_user(arg, _arg))
2545                 return -EFAULT;
2546         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2547                 return -EINVAL;
2548         runtime->tstamp_type = arg;
2549         return 0;
2550 }
2551
2552 static int snd_pcm_common_ioctl1(struct file *file,
2553                                  struct snd_pcm_substream *substream,
2554                                  unsigned int cmd, void __user *arg)
2555 {
2556         switch (cmd) {
2557         case SNDRV_PCM_IOCTL_PVERSION:
2558                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2559         case SNDRV_PCM_IOCTL_INFO:
2560                 return snd_pcm_info_user(substream, arg);
2561         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2562                 return 0;
2563         case SNDRV_PCM_IOCTL_TTSTAMP:
2564                 return snd_pcm_tstamp(substream, arg);
2565         case SNDRV_PCM_IOCTL_HW_REFINE:
2566                 return snd_pcm_hw_refine_user(substream, arg);
2567         case SNDRV_PCM_IOCTL_HW_PARAMS:
2568                 return snd_pcm_hw_params_user(substream, arg);
2569         case SNDRV_PCM_IOCTL_HW_FREE:
2570                 return snd_pcm_hw_free(substream);
2571         case SNDRV_PCM_IOCTL_SW_PARAMS:
2572                 return snd_pcm_sw_params_user(substream, arg);
2573         case SNDRV_PCM_IOCTL_STATUS:
2574                 return snd_pcm_status_user(substream, arg);
2575         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2576                 return snd_pcm_channel_info_user(substream, arg);
2577         case SNDRV_PCM_IOCTL_PREPARE:
2578                 return snd_pcm_prepare(substream, file);
2579         case SNDRV_PCM_IOCTL_RESET:
2580                 return snd_pcm_reset(substream);
2581         case SNDRV_PCM_IOCTL_START:
2582                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2583         case SNDRV_PCM_IOCTL_LINK:
2584                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2585         case SNDRV_PCM_IOCTL_UNLINK:
2586                 return snd_pcm_unlink(substream);
2587         case SNDRV_PCM_IOCTL_RESUME:
2588                 return snd_pcm_resume(substream);
2589         case SNDRV_PCM_IOCTL_XRUN:
2590                 return snd_pcm_xrun(substream);
2591         case SNDRV_PCM_IOCTL_HWSYNC:
2592                 return snd_pcm_hwsync(substream);
2593         case SNDRV_PCM_IOCTL_DELAY:
2594                 return snd_pcm_delay(substream, arg);
2595         case SNDRV_PCM_IOCTL_SYNC_PTR:
2596                 return snd_pcm_sync_ptr(substream, arg);
2597 #ifdef CONFIG_SND_SUPPORT_OLD_API
2598         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2599                 return snd_pcm_hw_refine_old_user(substream, arg);
2600         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2601                 return snd_pcm_hw_params_old_user(substream, arg);
2602 #endif
2603         case SNDRV_PCM_IOCTL_DRAIN:
2604                 return snd_pcm_drain(substream, file);
2605         case SNDRV_PCM_IOCTL_DROP:
2606                 return snd_pcm_drop(substream);
2607         case SNDRV_PCM_IOCTL_PAUSE:
2608         {
2609                 int res;
2610                 snd_pcm_stream_lock_irq(substream);
2611                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2612                 snd_pcm_stream_unlock_irq(substream);
2613                 return res;
2614         }
2615         }
2616         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2617         return -ENOTTY;
2618 }
2619
2620 static int snd_pcm_playback_ioctl1(struct file *file,
2621                                    struct snd_pcm_substream *substream,
2622                                    unsigned int cmd, void __user *arg)
2623 {
2624         if (snd_BUG_ON(!substream))
2625                 return -ENXIO;
2626         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2627                 return -EINVAL;
2628         switch (cmd) {
2629         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2630         {
2631                 struct snd_xferi xferi;
2632                 struct snd_xferi __user *_xferi = arg;
2633                 struct snd_pcm_runtime *runtime = substream->runtime;
2634                 snd_pcm_sframes_t result;
2635                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2636                         return -EBADFD;
2637                 if (put_user(0, &_xferi->result))
2638                         return -EFAULT;
2639                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2640                         return -EFAULT;
2641                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2642                 __put_user(result, &_xferi->result);
2643                 return result < 0 ? result : 0;
2644         }
2645         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2646         {
2647                 struct snd_xfern xfern;
2648                 struct snd_xfern __user *_xfern = arg;
2649                 struct snd_pcm_runtime *runtime = substream->runtime;
2650                 void __user **bufs;
2651                 snd_pcm_sframes_t result;
2652                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2653                         return -EBADFD;
2654                 if (runtime->channels > 128)
2655                         return -EINVAL;
2656                 if (put_user(0, &_xfern->result))
2657                         return -EFAULT;
2658                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2659                         return -EFAULT;
2660
2661                 bufs = memdup_user(xfern.bufs,
2662                                    sizeof(void *) * runtime->channels);
2663                 if (IS_ERR(bufs))
2664                         return PTR_ERR(bufs);
2665                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2666                 kfree(bufs);
2667                 __put_user(result, &_xfern->result);
2668                 return result < 0 ? result : 0;
2669         }
2670         case SNDRV_PCM_IOCTL_REWIND:
2671         {
2672                 snd_pcm_uframes_t frames;
2673                 snd_pcm_uframes_t __user *_frames = arg;
2674                 snd_pcm_sframes_t result;
2675                 if (get_user(frames, _frames))
2676                         return -EFAULT;
2677                 if (put_user(0, _frames))
2678                         return -EFAULT;
2679                 result = snd_pcm_playback_rewind(substream, frames);
2680                 __put_user(result, _frames);
2681                 return result < 0 ? result : 0;
2682         }
2683         case SNDRV_PCM_IOCTL_FORWARD:
2684         {
2685                 snd_pcm_uframes_t frames;
2686                 snd_pcm_uframes_t __user *_frames = arg;
2687                 snd_pcm_sframes_t result;
2688                 if (get_user(frames, _frames))
2689                         return -EFAULT;
2690                 if (put_user(0, _frames))
2691                         return -EFAULT;
2692                 result = snd_pcm_playback_forward(substream, frames);
2693                 __put_user(result, _frames);
2694                 return result < 0 ? result : 0;
2695         }
2696         }
2697         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2698 }
2699
2700 static int snd_pcm_capture_ioctl1(struct file *file,
2701                                   struct snd_pcm_substream *substream,
2702                                   unsigned int cmd, void __user *arg)
2703 {
2704         if (snd_BUG_ON(!substream))
2705                 return -ENXIO;
2706         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2707                 return -EINVAL;
2708         switch (cmd) {
2709         case SNDRV_PCM_IOCTL_READI_FRAMES:
2710         {
2711                 struct snd_xferi xferi;
2712                 struct snd_xferi __user *_xferi = arg;
2713                 struct snd_pcm_runtime *runtime = substream->runtime;
2714                 snd_pcm_sframes_t result;
2715                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2716                         return -EBADFD;
2717                 if (put_user(0, &_xferi->result))
2718                         return -EFAULT;
2719                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2720                         return -EFAULT;
2721                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2722                 __put_user(result, &_xferi->result);
2723                 return result < 0 ? result : 0;
2724         }
2725         case SNDRV_PCM_IOCTL_READN_FRAMES:
2726         {
2727                 struct snd_xfern xfern;
2728                 struct snd_xfern __user *_xfern = arg;
2729                 struct snd_pcm_runtime *runtime = substream->runtime;
2730                 void *bufs;
2731                 snd_pcm_sframes_t result;
2732                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2733                         return -EBADFD;
2734                 if (runtime->channels > 128)
2735                         return -EINVAL;
2736                 if (put_user(0, &_xfern->result))
2737                         return -EFAULT;
2738                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2739                         return -EFAULT;
2740
2741                 bufs = memdup_user(xfern.bufs,
2742                                    sizeof(void *) * runtime->channels);
2743                 if (IS_ERR(bufs))
2744                         return PTR_ERR(bufs);
2745                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2746                 kfree(bufs);
2747                 __put_user(result, &_xfern->result);
2748                 return result < 0 ? result : 0;
2749         }
2750         case SNDRV_PCM_IOCTL_REWIND:
2751         {
2752                 snd_pcm_uframes_t frames;
2753                 snd_pcm_uframes_t __user *_frames = arg;
2754                 snd_pcm_sframes_t result;
2755                 if (get_user(frames, _frames))
2756                         return -EFAULT;
2757                 if (put_user(0, _frames))
2758                         return -EFAULT;
2759                 result = snd_pcm_capture_rewind(substream, frames);
2760                 __put_user(result, _frames);
2761                 return result < 0 ? result : 0;
2762         }
2763         case SNDRV_PCM_IOCTL_FORWARD:
2764         {
2765                 snd_pcm_uframes_t frames;
2766                 snd_pcm_uframes_t __user *_frames = arg;
2767                 snd_pcm_sframes_t result;
2768                 if (get_user(frames, _frames))
2769                         return -EFAULT;
2770                 if (put_user(0, _frames))
2771                         return -EFAULT;
2772                 result = snd_pcm_capture_forward(substream, frames);
2773                 __put_user(result, _frames);
2774                 return result < 0 ? result : 0;
2775         }
2776         }
2777         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2778 }
2779
2780 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2781                                    unsigned long arg)
2782 {
2783         struct snd_pcm_file *pcm_file;
2784
2785         pcm_file = file->private_data;
2786
2787         if (((cmd >> 8) & 0xff) != 'A')
2788                 return -ENOTTY;
2789
2790         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2791                                        (void __user *)arg);
2792 }
2793
2794 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2795                                   unsigned long arg)
2796 {
2797         struct snd_pcm_file *pcm_file;
2798
2799         pcm_file = file->private_data;
2800
2801         if (((cmd >> 8) & 0xff) != 'A')
2802                 return -ENOTTY;
2803
2804         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2805                                       (void __user *)arg);
2806 }
2807
2808 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2809                          unsigned int cmd, void *arg)
2810 {
2811         mm_segment_t fs;
2812         int result;
2813
2814         fs = snd_enter_user();
2815         switch (substream->stream) {
2816         case SNDRV_PCM_STREAM_PLAYBACK:
2817                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2818                                                  (void __user *)arg);
2819                 break;
2820         case SNDRV_PCM_STREAM_CAPTURE:
2821                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2822                                                 (void __user *)arg);
2823                 break;
2824         default:
2825                 result = -EINVAL;
2826                 break;
2827         }
2828         snd_leave_user(fs);
2829         return result;
2830 }
2831
2832 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2833
2834 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2835                             loff_t * offset)
2836 {
2837         struct snd_pcm_file *pcm_file;
2838         struct snd_pcm_substream *substream;
2839         struct snd_pcm_runtime *runtime;
2840         snd_pcm_sframes_t result;
2841
2842         pcm_file = file->private_data;
2843         substream = pcm_file->substream;
2844         if (PCM_RUNTIME_CHECK(substream))
2845                 return -ENXIO;
2846         runtime = substream->runtime;
2847         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2848                 return -EBADFD;
2849         if (!frame_aligned(runtime, count))
2850                 return -EINVAL;
2851         count = bytes_to_frames(runtime, count);
2852         result = snd_pcm_lib_read(substream, buf, count);
2853         if (result > 0)
2854                 result = frames_to_bytes(runtime, result);
2855         return result;
2856 }
2857
2858 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2859                              size_t count, loff_t * offset)
2860 {
2861         struct snd_pcm_file *pcm_file;
2862         struct snd_pcm_substream *substream;
2863         struct snd_pcm_runtime *runtime;
2864         snd_pcm_sframes_t result;
2865
2866         pcm_file = file->private_data;
2867         substream = pcm_file->substream;
2868         if (PCM_RUNTIME_CHECK(substream))
2869                 return -ENXIO;
2870         runtime = substream->runtime;
2871         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2872                 return -EBADFD;
2873         if (!frame_aligned(runtime, count))
2874                 return -EINVAL;
2875         count = bytes_to_frames(runtime, count);
2876         result = snd_pcm_lib_write(substream, buf, count);
2877         if (result > 0)
2878                 result = frames_to_bytes(runtime, result);
2879         return result;
2880 }
2881
2882 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2883                              unsigned long nr_segs, loff_t pos)
2884
2885 {
2886         struct snd_pcm_file *pcm_file;
2887         struct snd_pcm_substream *substream;
2888         struct snd_pcm_runtime *runtime;
2889         snd_pcm_sframes_t result;
2890         unsigned long i;
2891         void __user **bufs;
2892         snd_pcm_uframes_t frames;
2893
2894         pcm_file = iocb->ki_filp->private_data;
2895         substream = pcm_file->substream;
2896         if (PCM_RUNTIME_CHECK(substream))
2897                 return -ENXIO;
2898         runtime = substream->runtime;
2899         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2900                 return -EBADFD;
2901         if (nr_segs > 1024 || nr_segs != runtime->channels)
2902                 return -EINVAL;
2903         if (!frame_aligned(runtime, iov->iov_len))
2904                 return -EINVAL;
2905         frames = bytes_to_samples(runtime, iov->iov_len);
2906         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2907         if (bufs == NULL)
2908                 return -ENOMEM;
2909         for (i = 0; i < nr_segs; ++i)
2910                 bufs[i] = iov[i].iov_base;
2911         result = snd_pcm_lib_readv(substream, bufs, frames);
2912         if (result > 0)
2913                 result = frames_to_bytes(runtime, result);
2914         kfree(bufs);
2915         return result;
2916 }
2917
2918 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2919                               unsigned long nr_segs, loff_t pos)
2920 {
2921         struct snd_pcm_file *pcm_file;
2922         struct snd_pcm_substream *substream;
2923         struct snd_pcm_runtime *runtime;
2924         snd_pcm_sframes_t result;
2925         unsigned long i;
2926         void __user **bufs;
2927         snd_pcm_uframes_t frames;
2928
2929         pcm_file = iocb->ki_filp->private_data;
2930         substream = pcm_file->substream;
2931         if (PCM_RUNTIME_CHECK(substream))
2932                 return -ENXIO;
2933         runtime = substream->runtime;
2934         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2935                 return -EBADFD;
2936         if (nr_segs > 128 || nr_segs != runtime->channels ||
2937             !frame_aligned(runtime, iov->iov_len))
2938                 return -EINVAL;
2939         frames = bytes_to_samples(runtime, iov->iov_len);
2940         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2941         if (bufs == NULL)
2942                 return -ENOMEM;
2943         for (i = 0; i < nr_segs; ++i)
2944                 bufs[i] = iov[i].iov_base;
2945         result = snd_pcm_lib_writev(substream, bufs, frames);
2946         if (result > 0)
2947                 result = frames_to_bytes(runtime, result);
2948         kfree(bufs);
2949         return result;
2950 }
2951
2952 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2953 {
2954         struct snd_pcm_file *pcm_file;
2955         struct snd_pcm_substream *substream;
2956         struct snd_pcm_runtime *runtime;
2957         unsigned int mask;
2958         snd_pcm_uframes_t avail;
2959
2960         pcm_file = file->private_data;
2961
2962         substream = pcm_file->substream;
2963         if (PCM_RUNTIME_CHECK(substream))
2964                 return -ENXIO;
2965         runtime = substream->runtime;
2966
2967         poll_wait(file, &runtime->sleep, wait);
2968
2969         snd_pcm_stream_lock_irq(substream);
2970         avail = snd_pcm_playback_avail(runtime);
2971         switch (runtime->status->state) {
2972         case SNDRV_PCM_STATE_RUNNING:
2973         case SNDRV_PCM_STATE_PREPARED:
2974         case SNDRV_PCM_STATE_PAUSED:
2975                 if (avail >= runtime->control->avail_min) {
2976                         mask = POLLOUT | POLLWRNORM;
2977                         break;
2978                 }
2979                 /* Fall through */
2980         case SNDRV_PCM_STATE_DRAINING:
2981                 mask = 0;
2982                 break;
2983         default:
2984                 mask = POLLOUT | POLLWRNORM | POLLERR;
2985                 break;
2986         }
2987         snd_pcm_stream_unlock_irq(substream);
2988         return mask;
2989 }
2990
2991 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2992 {
2993         struct snd_pcm_file *pcm_file;
2994         struct snd_pcm_substream *substream;
2995         struct snd_pcm_runtime *runtime;
2996         unsigned int mask;
2997         snd_pcm_uframes_t avail;
2998
2999         pcm_file = file->private_data;
3000
3001         substream = pcm_file->substream;
3002         if (PCM_RUNTIME_CHECK(substream))
3003                 return -ENXIO;
3004         runtime = substream->runtime;
3005
3006         poll_wait(file, &runtime->sleep, wait);
3007
3008         snd_pcm_stream_lock_irq(substream);
3009         avail = snd_pcm_capture_avail(runtime);
3010         switch (runtime->status->state) {
3011         case SNDRV_PCM_STATE_RUNNING:
3012         case SNDRV_PCM_STATE_PREPARED:
3013         case SNDRV_PCM_STATE_PAUSED:
3014                 if (avail >= runtime->control->avail_min) {
3015                         mask = POLLIN | POLLRDNORM;
3016                         break;
3017                 }
3018                 mask = 0;
3019                 break;
3020         case SNDRV_PCM_STATE_DRAINING:
3021                 if (avail > 0) {
3022                         mask = POLLIN | POLLRDNORM;
3023                         break;
3024                 }
3025                 /* Fall through */
3026         default:
3027                 mask = POLLIN | POLLRDNORM | POLLERR;
3028                 break;
3029         }
3030         snd_pcm_stream_unlock_irq(substream);
3031         return mask;
3032 }
3033
3034 /*
3035  * mmap support
3036  */
3037
3038 /*
3039  * Only on coherent architectures, we can mmap the status and the control records
3040  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3041  */
3042 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3043 /*
3044  * mmap status record
3045  */
3046 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3047                                                 struct vm_fault *vmf)
3048 {
3049         struct snd_pcm_substream *substream = area->vm_private_data;
3050         struct snd_pcm_runtime *runtime;
3051
3052         if (substream == NULL)
3053                 return VM_FAULT_SIGBUS;
3054         runtime = substream->runtime;
3055         vmf->page = virt_to_page(runtime->status);
3056         get_page(vmf->page);
3057         return 0;
3058 }
3059
3060 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3061 {
3062         .fault =        snd_pcm_mmap_status_fault,
3063 };
3064
3065 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3066                                struct vm_area_struct *area)
3067 {
3068         long size;
3069         if (!(area->vm_flags & VM_READ))
3070                 return -EINVAL;
3071         size = area->vm_end - area->vm_start;
3072         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3073                 return -EINVAL;
3074         area->vm_ops = &snd_pcm_vm_ops_status;
3075         area->vm_private_data = substream;
3076         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3077         return 0;
3078 }
3079
3080 /*
3081  * mmap control record
3082  */
3083 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3084                                                 struct vm_fault *vmf)
3085 {
3086         struct snd_pcm_substream *substream = area->vm_private_data;
3087         struct snd_pcm_runtime *runtime;
3088
3089         if (substream == NULL)
3090                 return VM_FAULT_SIGBUS;
3091         runtime = substream->runtime;
3092         vmf->page = virt_to_page(runtime->control);
3093         get_page(vmf->page);
3094         return 0;
3095 }
3096
3097 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3098 {
3099         .fault =        snd_pcm_mmap_control_fault,
3100 };
3101
3102 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3103                                 struct vm_area_struct *area)
3104 {
3105         long size;
3106         if (!(area->vm_flags & VM_READ))
3107                 return -EINVAL;
3108         size = area->vm_end - area->vm_start;
3109         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3110                 return -EINVAL;
3111         area->vm_ops = &snd_pcm_vm_ops_control;
3112         area->vm_private_data = substream;
3113         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3114         return 0;
3115 }
3116 #else /* ! coherent mmap */
3117 /*
3118  * don't support mmap for status and control records.
3119  */
3120 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3121                                struct vm_area_struct *area)
3122 {
3123         return -ENXIO;
3124 }
3125 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3126                                 struct vm_area_struct *area)
3127 {
3128         return -ENXIO;
3129 }
3130 #endif /* coherent mmap */
3131
3132 static inline struct page *
3133 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3134 {
3135         void *vaddr = substream->runtime->dma_area + ofs;
3136 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3137         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3138                 return virt_to_page(CAC_ADDR(vaddr));
3139 #endif
3140 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3141         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3142                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3143                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3144                 /* assume dma_handle set via pfn_to_phys() in
3145                  * mm/dma-noncoherent.c
3146                  */
3147                 return pfn_to_page(addr >> PAGE_SHIFT);
3148         }
3149 #endif
3150         return virt_to_page(vaddr);
3151 }
3152
3153 /*
3154  * fault callback for mmapping a RAM page
3155  */
3156 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3157                                                 struct vm_fault *vmf)
3158 {
3159         struct snd_pcm_substream *substream = area->vm_private_data;
3160         struct snd_pcm_runtime *runtime;
3161         unsigned long offset;
3162         struct page * page;
3163         size_t dma_bytes;
3164
3165         if (substream == NULL)
3166                 return VM_FAULT_SIGBUS;
3167         runtime = substream->runtime;
3168         offset = vmf->pgoff << PAGE_SHIFT;
3169         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3170         if (offset > dma_bytes - PAGE_SIZE)
3171                 return VM_FAULT_SIGBUS;
3172         if (substream->ops->page)
3173                 page = substream->ops->page(substream, offset);
3174         else
3175                 page = snd_pcm_default_page_ops(substream, offset);
3176         if (!page)
3177                 return VM_FAULT_SIGBUS;
3178         get_page(page);
3179         vmf->page = page;
3180         return 0;
3181 }
3182
3183 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3184         .open =         snd_pcm_mmap_data_open,
3185         .close =        snd_pcm_mmap_data_close,
3186 };
3187
3188 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3189         .open =         snd_pcm_mmap_data_open,
3190         .close =        snd_pcm_mmap_data_close,
3191         .fault =        snd_pcm_mmap_data_fault,
3192 };
3193
3194 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3195 /* This should be defined / handled globally! */
3196 #ifdef CONFIG_ARM
3197 #define ARCH_HAS_DMA_MMAP_COHERENT
3198 #endif
3199 #endif
3200
3201 /*
3202  * mmap the DMA buffer on RAM
3203  */
3204 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3205                              struct vm_area_struct *area)
3206 {
3207         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3208 #ifdef CONFIG_GENERIC_ALLOCATOR
3209         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3210                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3211                 return remap_pfn_range(area, area->vm_start,
3212                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3213                                 area->vm_end - area->vm_start, area->vm_page_prot);
3214         }
3215 #endif /* CONFIG_GENERIC_ALLOCATOR */
3216 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3217         if (!substream->ops->page &&
3218             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3219                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3220                                          area,
3221                                          substream->runtime->dma_area,
3222                                          substream->runtime->dma_addr,
3223                                          area->vm_end - area->vm_start);
3224 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3225         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3226             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3227                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3228 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3229         /* mmap with fault handler */
3230         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3231         return 0;
3232 }
3233 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3234
3235 /*
3236  * mmap the DMA buffer on I/O memory area
3237  */
3238 #if SNDRV_PCM_INFO_MMAP_IOMEM
3239 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3240                            struct vm_area_struct *area)
3241 {
3242         struct snd_pcm_runtime *runtime = substream->runtime;;
3243
3244         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3245         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3246 }
3247
3248 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3249 #endif /* SNDRV_PCM_INFO_MMAP */
3250
3251 /*
3252  * mmap DMA buffer
3253  */
3254 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3255                       struct vm_area_struct *area)
3256 {
3257         struct snd_pcm_runtime *runtime;
3258         long size;
3259         unsigned long offset;
3260         size_t dma_bytes;
3261         int err;
3262
3263         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3264                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3265                         return -EINVAL;
3266         } else {
3267                 if (!(area->vm_flags & VM_READ))
3268                         return -EINVAL;
3269         }
3270         runtime = substream->runtime;
3271         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3272                 return -EBADFD;
3273         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3274                 return -ENXIO;
3275         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3276             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3277                 return -EINVAL;
3278         size = area->vm_end - area->vm_start;
3279         offset = area->vm_pgoff << PAGE_SHIFT;
3280         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3281         if ((size_t)size > dma_bytes)
3282                 return -EINVAL;
3283         if (offset > dma_bytes - size)
3284                 return -EINVAL;
3285
3286         area->vm_ops = &snd_pcm_vm_ops_data;
3287         area->vm_private_data = substream;
3288         if (substream->ops->mmap)
3289                 err = substream->ops->mmap(substream, area);
3290         else
3291                 err = snd_pcm_lib_default_mmap(substream, area);
3292         if (!err)
3293                 atomic_inc(&substream->mmap_count);
3294         return err;
3295 }
3296
3297 EXPORT_SYMBOL(snd_pcm_mmap_data);
3298
3299 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3300 {
3301         struct snd_pcm_file * pcm_file;
3302         struct snd_pcm_substream *substream;
3303         unsigned long offset;
3304
3305         pcm_file = file->private_data;
3306         substream = pcm_file->substream;
3307         if (PCM_RUNTIME_CHECK(substream))
3308                 return -ENXIO;
3309
3310         offset = area->vm_pgoff << PAGE_SHIFT;
3311         switch (offset) {
3312         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3313                 if (pcm_file->no_compat_mmap)
3314                         return -ENXIO;
3315                 return snd_pcm_mmap_status(substream, file, area);
3316         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3317                 if (pcm_file->no_compat_mmap)
3318                         return -ENXIO;
3319                 return snd_pcm_mmap_control(substream, file, area);
3320         default:
3321                 return snd_pcm_mmap_data(substream, file, area);
3322         }
3323         return 0;
3324 }
3325
3326 static int snd_pcm_fasync(int fd, struct file * file, int on)
3327 {
3328         struct snd_pcm_file * pcm_file;
3329         struct snd_pcm_substream *substream;
3330         struct snd_pcm_runtime *runtime;
3331
3332         pcm_file = file->private_data;
3333         substream = pcm_file->substream;
3334         if (PCM_RUNTIME_CHECK(substream))
3335                 return -ENXIO;
3336         runtime = substream->runtime;
3337         return fasync_helper(fd, file, on, &runtime->fasync);
3338 }
3339
3340 /*
3341  * ioctl32 compat
3342  */
3343 #ifdef CONFIG_COMPAT
3344 #include "pcm_compat.c"
3345 #else
3346 #define snd_pcm_ioctl_compat    NULL
3347 #endif
3348
3349 /*
3350  *  To be removed helpers to keep binary compatibility
3351  */
3352
3353 #ifdef CONFIG_SND_SUPPORT_OLD_API
3354 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3355 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3356
3357 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3358                                                struct snd_pcm_hw_params_old *oparams)
3359 {
3360         unsigned int i;
3361
3362         memset(params, 0, sizeof(*params));
3363         params->flags = oparams->flags;
3364         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3365                 params->masks[i].bits[0] = oparams->masks[i];
3366         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3367         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3368         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3369         params->info = oparams->info;
3370         params->msbits = oparams->msbits;
3371         params->rate_num = oparams->rate_num;
3372         params->rate_den = oparams->rate_den;
3373         params->fifo_size = oparams->fifo_size;
3374 }
3375
3376 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3377                                              struct snd_pcm_hw_params *params)
3378 {
3379         unsigned int i;
3380
3381         memset(oparams, 0, sizeof(*oparams));
3382         oparams->flags = params->flags;
3383         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3384                 oparams->masks[i] = params->masks[i].bits[0];
3385         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3386         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3387         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3388         oparams->info = params->info;
3389         oparams->msbits = params->msbits;
3390         oparams->rate_num = params->rate_num;
3391         oparams->rate_den = params->rate_den;
3392         oparams->fifo_size = params->fifo_size;
3393 }
3394
3395 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3396                                       struct snd_pcm_hw_params_old __user * _oparams)
3397 {
3398         struct snd_pcm_hw_params *params;
3399         struct snd_pcm_hw_params_old *oparams = NULL;
3400         int err;
3401
3402         params = kmalloc(sizeof(*params), GFP_KERNEL);
3403         if (!params)
3404                 return -ENOMEM;
3405
3406         oparams = memdup_user(_oparams, sizeof(*oparams));
3407         if (IS_ERR(oparams)) {
3408                 err = PTR_ERR(oparams);
3409                 goto out;
3410         }
3411         snd_pcm_hw_convert_from_old_params(params, oparams);
3412         err = snd_pcm_hw_refine(substream, params);
3413         snd_pcm_hw_convert_to_old_params(oparams, params);
3414         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3415                 if (!err)
3416                         err = -EFAULT;
3417         }
3418
3419         kfree(oparams);
3420 out:
3421         kfree(params);
3422         return err;
3423 }
3424
3425 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3426                                       struct snd_pcm_hw_params_old __user * _oparams)
3427 {
3428         struct snd_pcm_hw_params *params;
3429         struct snd_pcm_hw_params_old *oparams = NULL;
3430         int err;
3431
3432         params = kmalloc(sizeof(*params), GFP_KERNEL);
3433         if (!params)
3434                 return -ENOMEM;
3435
3436         oparams = memdup_user(_oparams, sizeof(*oparams));
3437         if (IS_ERR(oparams)) {
3438                 err = PTR_ERR(oparams);
3439                 goto out;
3440         }
3441         snd_pcm_hw_convert_from_old_params(params, oparams);
3442         err = snd_pcm_hw_params(substream, params);
3443         snd_pcm_hw_convert_to_old_params(oparams, params);
3444         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3445                 if (!err)
3446                         err = -EFAULT;
3447         }
3448
3449         kfree(oparams);
3450 out:
3451         kfree(params);
3452         return err;
3453 }
3454 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3455
3456 #ifndef CONFIG_MMU
3457 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3458                                                unsigned long addr,
3459                                                unsigned long len,
3460                                                unsigned long pgoff,
3461                                                unsigned long flags)
3462 {
3463         struct snd_pcm_file *pcm_file = file->private_data;
3464         struct snd_pcm_substream *substream = pcm_file->substream;
3465         struct snd_pcm_runtime *runtime = substream->runtime;
3466         unsigned long offset = pgoff << PAGE_SHIFT;
3467
3468         switch (offset) {
3469         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3470                 return (unsigned long)runtime->status;
3471         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3472                 return (unsigned long)runtime->control;
3473         default:
3474                 return (unsigned long)runtime->dma_area + offset;
3475         }
3476 }
3477 #else
3478 # define snd_pcm_get_unmapped_area NULL
3479 #endif
3480
3481 /*
3482  *  Register section
3483  */
3484
3485 const struct file_operations snd_pcm_f_ops[2] = {
3486         {
3487                 .owner =                THIS_MODULE,
3488                 .write =                snd_pcm_write,
3489                 .aio_write =            snd_pcm_aio_write,
3490                 .open =                 snd_pcm_playback_open,
3491                 .release =              snd_pcm_release,
3492                 .llseek =               no_llseek,
3493                 .poll =                 snd_pcm_playback_poll,
3494                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3495                 .compat_ioctl =         snd_pcm_ioctl_compat,
3496                 .mmap =                 snd_pcm_mmap,
3497                 .fasync =               snd_pcm_fasync,
3498                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3499         },
3500         {
3501                 .owner =                THIS_MODULE,
3502                 .read =                 snd_pcm_read,
3503                 .aio_read =             snd_pcm_aio_read,
3504                 .open =                 snd_pcm_capture_open,
3505                 .release =              snd_pcm_release,
3506                 .llseek =               no_llseek,
3507                 .poll =                 snd_pcm_capture_poll,
3508                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3509                 .compat_ioctl =         snd_pcm_ioctl_compat,
3510                 .mmap =                 snd_pcm_mmap,
3511                 .fasync =               snd_pcm_fasync,
3512                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3513         }
3514 };