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/io.h>
  30 #include <linux/dma-mapping.h>
  31 #include <sound/core.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/timer.h>
  37 #include <sound/minors.h>
  38
  39 /*
  40  *  Compatibility
  41  */
  42
  43 struct snd_pcm_hw_params_old {
  44         unsigned int flags;
  45         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  46                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  47         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  48                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  49         unsigned int rmask;
  50         unsigned int cmask;
  51         unsigned int info;
  52         unsigned int msbits;
  53         unsigned int rate_num;
  54         unsigned int rate_den;
  55         snd_pcm_uframes_t fifo_size;
  56         unsigned char reserved[64];
  57 };
  58
  59 #ifdef CONFIG_SND_SUPPORT_OLD_API
  60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  62
  63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  64                                       struct snd_pcm_hw_params_old __user * _oparams);
  65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  66                                       struct snd_pcm_hw_params_old __user * _oparams);
  67 #endif
  68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  69
  70 /*
  71  *
  72  */
  73
  74 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
  75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  76
  77 /**
  78  * snd_pcm_stream_lock - Lock the PCM stream
  79  * @substream: PCM substream
  80  *
  81  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
  82  * flag of the given substream.  This also takes the global link rw lock
  83  * (or rw sem), too, for avoiding the race with linked streams.
  84  */
  85 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
  86 {
  87         if (substream->pcm->nonatomic) {
  88                 down_read(&snd_pcm_link_rwsem);
  89                 mutex_lock(&substream->self_group.mutex);
  90         } else {
  91                 read_lock(&snd_pcm_link_rwlock);
  92                 spin_lock(&substream->self_group.lock);
  93         }
  94 }
  95 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
  96
  97 /**
  98  * snd_pcm_stream_lock - Unlock the PCM stream
  99  * @substream: PCM substream
 100  *
 101  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
 102  */
 103 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 104 {
 105         if (substream->pcm->nonatomic) {
 106                 mutex_unlock(&substream->self_group.mutex);
 107                 up_read(&snd_pcm_link_rwsem);
 108         } else {
 109                 spin_unlock(&substream->self_group.lock);
 110                 read_unlock(&snd_pcm_link_rwlock);
 111         }
 112 }
 113 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
 114
 115 /**
 116  * snd_pcm_stream_lock_irq - Lock the PCM stream
 117  * @substream: PCM substream
 118  *
 119  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
 120  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 121  * as snd_pcm_stream_lock().
 122  */
 123 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 124 {
 125         if (!substream->pcm->nonatomic)
 126                 local_irq_disable();
 127         snd_pcm_stream_lock(substream);
 128 }
 129 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
 130
 131 /**
 132  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 133  * @substream: PCM substream
 134  *
 135  * This is a counter-part of snd_pcm_stream_lock_irq().
 136  */
 137 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 138 {
 139         snd_pcm_stream_unlock(substream);
 140         if (!substream->pcm->nonatomic)
 141                 local_irq_enable();
 142 }
 143 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
 144
 145 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
 146 {
 147         unsigned long flags = 0;
 148         if (!substream->pcm->nonatomic)
 149                 local_irq_save(flags);
 150         snd_pcm_stream_lock(substream);
 151         return flags;
 152 }
 153 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
 154
 155 /**
 156  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
 157  * @substream: PCM substream
 158  * @flags: irq flags
 159  *
 160  * This is a counter-part of snd_pcm_stream_lock_irqsave().
 161  */
 162 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 163                                       unsigned long flags)
 164 {
 165         snd_pcm_stream_unlock(substream);
 166         if (!substream->pcm->nonatomic)
 167                 local_irq_restore(flags);
 168 }
 169 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
 170
 171 static inline mm_segment_t snd_enter_user(void)
 172 {
 173         mm_segment_t fs = get_fs();
 174         set_fs(get_ds());
 175         return fs;
 176 }
 177
 178 static inline void snd_leave_user(mm_segment_t fs)
 179 {
 180         set_fs(fs);
 181 }
 182
 183
 184
 185 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
 186 {
 187         struct snd_pcm_runtime *runtime;
 188         struct snd_pcm *pcm = substream->pcm;
 189         struct snd_pcm_str *pstr = substream->pstr;
 190
 191         memset(info, 0, sizeof(*info));
 192         info->card = pcm->card->number;
 193         info->device = pcm->device;
 194         info->stream = substream->stream;
 195         info->subdevice = substream->number;
 196         strlcpy(info->id, pcm->id, sizeof(info->id));
 197         strlcpy(info->name, pcm->name, sizeof(info->name));
 198         info->dev_class = pcm->dev_class;
 199         info->dev_subclass = pcm->dev_subclass;
 200         info->subdevices_count = pstr->substream_count;
 201         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 202         strlcpy(info->subname, substream->name, sizeof(info->subname));
 203         runtime = substream->runtime;
 204         /* AB: FIXME!!! This is definitely nonsense */
 205         if (runtime) {
 206                 info->sync = runtime->sync;
 207                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 208         }
 209         return 0;
 210 }
 211
 212 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 213                       struct snd_pcm_info __user * _info)
 214 {
 215         struct snd_pcm_info *info;
 216         int err;
 217
 218         info = kmalloc(sizeof(*info), GFP_KERNEL);
 219         if (! info)
 220                 return -ENOMEM;
 221         err = snd_pcm_info(substream, info);
 222         if (err >= 0) {
 223                 if (copy_to_user(_info, info, sizeof(*info)))
 224                         err = -EFAULT;
 225         }
 226         kfree(info);
 227         return err;
 228 }
 229
 230 static bool hw_support_mmap(struct snd_pcm_substream *substream)
 231 {
 232         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 233                 return false;
 234         /* check architectures that return -EINVAL from dma_mmap_coherent() */
 235         /* FIXME: this should be some global flag */
 236 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
 237         defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
 238         if (!substream->ops->mmap &&
 239             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
 240                 return false;
 241 #endif
 242         return true;
 243 }
 244
 245 #undef RULES_DEBUG
 246
 247 #ifdef RULES_DEBUG
 248 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 249 static const char * const snd_pcm_hw_param_names[] = {
 250         HW_PARAM(ACCESS),
 251         HW_PARAM(FORMAT),
 252         HW_PARAM(SUBFORMAT),
 253         HW_PARAM(SAMPLE_BITS),
 254         HW_PARAM(FRAME_BITS),
 255         HW_PARAM(CHANNELS),
 256         HW_PARAM(RATE),
 257         HW_PARAM(PERIOD_TIME),
 258         HW_PARAM(PERIOD_SIZE),
 259         HW_PARAM(PERIOD_BYTES),
 260         HW_PARAM(PERIODS),
 261         HW_PARAM(BUFFER_TIME),
 262         HW_PARAM(BUFFER_SIZE),
 263         HW_PARAM(BUFFER_BYTES),
 264         HW_PARAM(TICK_TIME),
 265 };
 266 #endif
 267
 268 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 269                       struct snd_pcm_hw_params *params)
 270 {
 271         unsigned int k;
 272         struct snd_pcm_hardware *hw;
 273         struct snd_interval *i = NULL;
 274         struct snd_mask *m = NULL;
 275         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 276         unsigned int rstamps[constrs->rules_num];
 277         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 278         unsigned int stamp = 2;
 279         int changed, again;
 280
 281         params->info = 0;
 282         params->fifo_size = 0;
 283         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 284                 params->msbits = 0;
 285         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 286                 params->rate_num = 0;
 287                 params->rate_den = 0;
 288         }
 289
 290         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 291                 m = hw_param_mask(params, k);
 292                 if (snd_mask_empty(m))
 293                         return -EINVAL;
 294                 if (!(params->rmask & (1 << k)))
 295                         continue;
 296 #ifdef RULES_DEBUG
 297                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
 298                 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 299 #endif
 300                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 301 #ifdef RULES_DEBUG
 302                 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 303 #endif
 304                 if (changed)
 305                         params->cmask |= 1 << k;
 306                 if (changed < 0)
 307                         return changed;
 308         }
 309
 310         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 311                 i = hw_param_interval(params, k);
 312                 if (snd_interval_empty(i))
 313                         return -EINVAL;
 314                 if (!(params->rmask & (1 << k)))
 315                         continue;
 316 #ifdef RULES_DEBUG
 317                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
 318                 if (i->empty)
 319                         pr_cont("empty");
 320                 else
 321                         pr_cont("%c%u %u%c",
 322                                i->openmin ? '(' : '[', i->min,
 323                                i->max, i->openmax ? ')' : ']');
 324                 pr_cont(" -> ");
 325 #endif
 326                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 327 #ifdef RULES_DEBUG
 328                 if (i->empty)
 329                         pr_cont("empty\n");
 330                 else
 331                         pr_cont("%c%u %u%c\n",
 332                                i->openmin ? '(' : '[', i->min,
 333                                i->max, i->openmax ? ')' : ']');
 334 #endif
 335                 if (changed)
 336                         params->cmask |= 1 << k;
 337                 if (changed < 0)
 338                         return changed;
 339         }
 340
 341         for (k = 0; k < constrs->rules_num; k++)
 342                 rstamps[k] = 0;
 343         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 344                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 345         do {
 346                 again = 0;
 347                 for (k = 0; k < constrs->rules_num; k++) {
 348                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 349                         unsigned int d;
 350                         int doit = 0;
 351                         if (r->cond && !(r->cond & params->flags))
 352                                 continue;
 353                         for (d = 0; r->deps[d] >= 0; d++) {
 354                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 355                                         doit = 1;
 356                                         break;
 357                                 }
 358                         }
 359                         if (!doit)
 360                                 continue;
 361 #ifdef RULES_DEBUG
 362                         pr_debug("Rule %d [%p]: ", k, r->func);
 363                         if (r->var >= 0) {
 364                                 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
 365                                 if (hw_is_mask(r->var)) {
 366                                         m = hw_param_mask(params, r->var);
 367                                         pr_cont("%x", *m->bits);
 368                                 } else {
 369                                         i = hw_param_interval(params, r->var);
 370                                         if (i->empty)
 371                                                 pr_cont("empty");
 372                                         else
 373                                                 pr_cont("%c%u %u%c",
 374                                                        i->openmin ? '(' : '[', i->min,
 375                                                        i->max, i->openmax ? ')' : ']');
 376                                 }
 377                         }
 378 #endif
 379                         changed = r->func(params, r);
 380 #ifdef RULES_DEBUG
 381                         if (r->var >= 0) {
 382                                 pr_cont(" -> ");
 383                                 if (hw_is_mask(r->var))
 384                                         pr_cont("%x", *m->bits);
 385                                 else {
 386                                         if (i->empty)
 387                                                 pr_cont("empty");
 388                                         else
 389                                                 pr_cont("%c%u %u%c",
 390                                                        i->openmin ? '(' : '[', i->min,
 391                                                        i->max, i->openmax ? ')' : ']');
 392                                 }
 393                         }
 394                         pr_cont("\n");
 395 #endif
 396                         rstamps[k] = stamp;
 397                         if (changed && r->var >= 0) {
 398                                 params->cmask |= (1 << r->var);
 399                                 vstamps[r->var] = stamp;
 400                                 again = 1;
 401                         }
 402                         if (changed < 0)
 403                                 return changed;
 404                         stamp++;
 405                 }
 406         } while (again);
 407         if (!params->msbits) {
 408                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 409                 if (snd_interval_single(i))
 410                         params->msbits = snd_interval_value(i);
 411         }
 412
 413         if (!params->rate_den) {
 414                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 415                 if (snd_interval_single(i)) {
 416                         params->rate_num = snd_interval_value(i);
 417                         params->rate_den = 1;
 418                 }
 419         }
 420
 421         hw = &substream->runtime->hw;
 422         if (!params->info) {
 423                 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
 424                                             SNDRV_PCM_INFO_DRAIN_TRIGGER);
 425                 if (!hw_support_mmap(substream))
 426                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
 427                                           SNDRV_PCM_INFO_MMAP_VALID);
 428         }
 429         if (!params->fifo_size) {
 430                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 431                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 432                 if (snd_mask_min(m) == snd_mask_max(m) &&
 433                     snd_interval_min(i) == snd_interval_max(i)) {
 434                         changed = substream->ops->ioctl(substream,
 435                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 436                         if (changed < 0)
 437                                 return changed;
 438                 }
 439         }
 440         params->rmask = 0;
 441         return 0;
 442 }
 443
 444 EXPORT_SYMBOL(snd_pcm_hw_refine);
 445
 446 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 447                                   struct snd_pcm_hw_params __user * _params)
 448 {
 449         struct snd_pcm_hw_params *params;
 450         int err;
 451
 452         params = memdup_user(_params, sizeof(*params));
 453         if (IS_ERR(params))
 454                 return PTR_ERR(params);
 455
 456         err = snd_pcm_hw_refine(substream, params);
 457         if (copy_to_user(_params, params, sizeof(*params))) {
 458                 if (!err)
 459                         err = -EFAULT;
 460         }
 461
 462         kfree(params);
 463         return err;
 464 }
 465
 466 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 467 {
 468         int usecs;
 469
 470         if (! runtime->rate)
 471                 return -1; /* invalid */
 472
 473         /* take 75% of period time as the deadline */
 474         usecs = (750000 / runtime->rate) * runtime->period_size;
 475         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 476                 runtime->rate;
 477
 478         return usecs;
 479 }
 480
 481 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
 482 {
 483         snd_pcm_stream_lock_irq(substream);
 484         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
 485                 substream->runtime->status->state = state;
 486         snd_pcm_stream_unlock_irq(substream);
 487 }
 488
 489 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 490                              struct snd_pcm_hw_params *params)
 491 {
 492         struct snd_pcm_runtime *runtime;
 493         int err, usecs;
 494         unsigned int bits;
 495         snd_pcm_uframes_t frames;
 496
 497         if (PCM_RUNTIME_CHECK(substream))
 498                 return -ENXIO;
 499         runtime = substream->runtime;
 500         snd_pcm_stream_lock_irq(substream);
 501         switch (runtime->status->state) {
 502         case SNDRV_PCM_STATE_OPEN:
 503         case SNDRV_PCM_STATE_SETUP:
 504         case SNDRV_PCM_STATE_PREPARED:
 505                 break;
 506         default:
 507                 snd_pcm_stream_unlock_irq(substream);
 508                 return -EBADFD;
 509         }
 510         snd_pcm_stream_unlock_irq(substream);
 511 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 512         if (!substream->oss.oss)
 513 #endif
 514                 if (atomic_read(&substream->mmap_count))
 515                         return -EBADFD;
 516
 517         params->rmask = ~0U;
 518         err = snd_pcm_hw_refine(substream, params);
 519         if (err < 0)
 520                 goto _error;
 521
 522         err = snd_pcm_hw_params_choose(substream, params);
 523         if (err < 0)
 524                 goto _error;
 525
 526         if (substream->ops->hw_params != NULL) {
 527                 err = substream->ops->hw_params(substream, params);
 528                 if (err < 0)
 529                         goto _error;
 530         }
 531
 532         runtime->access = params_access(params);
 533         runtime->format = params_format(params);
 534         runtime->subformat = params_subformat(params);
 535         runtime->channels = params_channels(params);
 536         runtime->rate = params_rate(params);
 537         runtime->period_size = params_period_size(params);
 538         runtime->periods = params_periods(params);
 539         runtime->buffer_size = params_buffer_size(params);
 540         runtime->info = params->info;
 541         runtime->rate_num = params->rate_num;
 542         runtime->rate_den = params->rate_den;
 543         runtime->no_period_wakeup =
 544                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 545                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 546
 547         bits = snd_pcm_format_physical_width(runtime->format);
 548         runtime->sample_bits = bits;
 549         bits *= runtime->channels;
 550         runtime->frame_bits = bits;
 551         frames = 1;
 552         while (bits % 8 != 0) {
 553                 bits *= 2;
 554                 frames *= 2;
 555         }
 556         runtime->byte_align = bits / 8;
 557         runtime->min_align = frames;
 558
 559         /* Default sw params */
 560         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 561         runtime->period_step = 1;
 562         runtime->control->avail_min = runtime->period_size;
 563         runtime->start_threshold = 1;
 564         runtime->stop_threshold = runtime->buffer_size;
 565         runtime->silence_threshold = 0;
 566         runtime->silence_size = 0;
 567         runtime->boundary = runtime->buffer_size;
 568         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 569                 runtime->boundary *= 2;
 570
 571         snd_pcm_timer_resolution_change(substream);
 572         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 573
 574         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 575                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 576         if ((usecs = period_to_usecs(runtime)) >= 0)
 577                 pm_qos_add_request(&substream->latency_pm_qos_req,
 578                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 579         return 0;
 580  _error:
 581         /* hardware might be unusable from this time,
 582            so we force application to retry to set
 583            the correct hardware parameter settings */
 584         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 585         if (substream->ops->hw_free != NULL)
 586                 substream->ops->hw_free(substream);
 587         return err;
 588 }
 589
 590 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 591                                   struct snd_pcm_hw_params __user * _params)
 592 {
 593         struct snd_pcm_hw_params *params;
 594         int err;
 595
 596         params = memdup_user(_params, sizeof(*params));
 597         if (IS_ERR(params))
 598                 return PTR_ERR(params);
 599
 600         err = snd_pcm_hw_params(substream, params);
 601         if (copy_to_user(_params, params, sizeof(*params))) {
 602                 if (!err)
 603                         err = -EFAULT;
 604         }
 605
 606         kfree(params);
 607         return err;
 608 }
 609
 610 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 611 {
 612         struct snd_pcm_runtime *runtime;
 613         int result = 0;
 614
 615         if (PCM_RUNTIME_CHECK(substream))
 616                 return -ENXIO;
 617         runtime = substream->runtime;
 618         snd_pcm_stream_lock_irq(substream);
 619         switch (runtime->status->state) {
 620         case SNDRV_PCM_STATE_SETUP:
 621         case SNDRV_PCM_STATE_PREPARED:
 622                 break;
 623         default:
 624                 snd_pcm_stream_unlock_irq(substream);
 625                 return -EBADFD;
 626         }
 627         snd_pcm_stream_unlock_irq(substream);
 628         if (atomic_read(&substream->mmap_count))
 629                 return -EBADFD;
 630         if (substream->ops->hw_free)
 631                 result = substream->ops->hw_free(substream);
 632         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 633         pm_qos_remove_request(&substream->latency_pm_qos_req);
 634         return result;
 635 }
 636
 637 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 638                              struct snd_pcm_sw_params *params)
 639 {
 640         struct snd_pcm_runtime *runtime;
 641         int err;
 642
 643         if (PCM_RUNTIME_CHECK(substream))
 644                 return -ENXIO;
 645         runtime = substream->runtime;
 646         snd_pcm_stream_lock_irq(substream);
 647         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 648                 snd_pcm_stream_unlock_irq(substream);
 649                 return -EBADFD;
 650         }
 651         snd_pcm_stream_unlock_irq(substream);
 652
 653         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 654                 return -EINVAL;
 655         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 656             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 657                 return -EINVAL;
 658         if (params->avail_min == 0)
 659                 return -EINVAL;
 660         if (params->silence_size >= runtime->boundary) {
 661                 if (params->silence_threshold != 0)
 662                         return -EINVAL;
 663         } else {
 664                 if (params->silence_size > params->silence_threshold)
 665                         return -EINVAL;
 666                 if (params->silence_threshold > runtime->buffer_size)
 667                         return -EINVAL;
 668         }
 669         err = 0;
 670         snd_pcm_stream_lock_irq(substream);
 671         runtime->tstamp_mode = params->tstamp_mode;
 672         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 673                 runtime->tstamp_type = params->tstamp_type;
 674         runtime->period_step = params->period_step;
 675         runtime->control->avail_min = params->avail_min;
 676         runtime->start_threshold = params->start_threshold;
 677         runtime->stop_threshold = params->stop_threshold;
 678         runtime->silence_threshold = params->silence_threshold;
 679         runtime->silence_size = params->silence_size;
 680         params->boundary = runtime->boundary;
 681         if (snd_pcm_running(substream)) {
 682                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 683                     runtime->silence_size > 0)
 684                         snd_pcm_playback_silence(substream, ULONG_MAX);
 685                 err = snd_pcm_update_state(substream, runtime);
 686         }
 687         snd_pcm_stream_unlock_irq(substream);
 688         return err;
 689 }
 690
 691 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 692                                   struct snd_pcm_sw_params __user * _params)
 693 {
 694         struct snd_pcm_sw_params params;
 695         int err;
 696         if (copy_from_user(&params, _params, sizeof(params)))
 697                 return -EFAULT;
 698         err = snd_pcm_sw_params(substream, &params);
 699         if (copy_to_user(_params, &params, sizeof(params)))
 700                 return -EFAULT;
 701         return err;
 702 }
 703
 704 int snd_pcm_status(struct snd_pcm_substream *substream,
 705                    struct snd_pcm_status *status)
 706 {
 707         struct snd_pcm_runtime *runtime = substream->runtime;
 708
 709         snd_pcm_stream_lock_irq(substream);
 710         status->state = runtime->status->state;
 711         status->suspended_state = runtime->status->suspended_state;
 712         if (status->state == SNDRV_PCM_STATE_OPEN)
 713                 goto _end;
 714         status->trigger_tstamp = runtime->trigger_tstamp;
 715         if (snd_pcm_running(substream)) {
 716                 snd_pcm_update_hw_ptr(substream);
 717                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 718                         status->tstamp = runtime->status->tstamp;
 719                         status->audio_tstamp =
 720                                 runtime->status->audio_tstamp;
 721                         goto _tstamp_end;
 722                 }
 723         } else {
 724                 /* get tstamp only in fallback mode and only if enabled */
 725                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 726                         snd_pcm_gettime(runtime, &status->tstamp);
 727         }
 728  _tstamp_end:
 729         status->appl_ptr = runtime->control->appl_ptr;
 730         status->hw_ptr = runtime->status->hw_ptr;
 731         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 732                 status->avail = snd_pcm_playback_avail(runtime);
 733                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 734                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 735                         status->delay = runtime->buffer_size - status->avail;
 736                         status->delay += runtime->delay;
 737                 } else
 738                         status->delay = 0;
 739         } else {
 740                 status->avail = snd_pcm_capture_avail(runtime);
 741                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 742                         status->delay = status->avail + runtime->delay;
 743                 else
 744                         status->delay = 0;
 745         }
 746         status->avail_max = runtime->avail_max;
 747         status->overrange = runtime->overrange;
 748         runtime->avail_max = 0;
 749         runtime->overrange = 0;
 750  _end:
 751         snd_pcm_stream_unlock_irq(substream);
 752         return 0;
 753 }
 754
 755 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 756                                struct snd_pcm_status __user * _status)
 757 {
 758         struct snd_pcm_status status;
 759         int res;
 760
 761         memset(&status, 0, sizeof(status));
 762         res = snd_pcm_status(substream, &status);
 763         if (res < 0)
 764                 return res;
 765         if (copy_to_user(_status, &status, sizeof(status)))
 766                 return -EFAULT;
 767         return 0;
 768 }
 769
 770 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 771                                 struct snd_pcm_channel_info * info)
 772 {
 773         struct snd_pcm_runtime *runtime;
 774         unsigned int channel;
 775
 776         channel = info->channel;
 777         runtime = substream->runtime;
 778         snd_pcm_stream_lock_irq(substream);
 779         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 780                 snd_pcm_stream_unlock_irq(substream);
 781                 return -EBADFD;
 782         }
 783         snd_pcm_stream_unlock_irq(substream);
 784         if (channel >= runtime->channels)
 785                 return -EINVAL;
 786         memset(info, 0, sizeof(*info));
 787         info->channel = channel;
 788         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 789 }
 790
 791 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 792                                      struct snd_pcm_channel_info __user * _info)
 793 {
 794         struct snd_pcm_channel_info info;
 795         int res;
 796
 797         if (copy_from_user(&info, _info, sizeof(info)))
 798                 return -EFAULT;
 799         res = snd_pcm_channel_info(substream, &info);
 800         if (res < 0)
 801                 return res;
 802         if (copy_to_user(_info, &info, sizeof(info)))
 803                 return -EFAULT;
 804         return 0;
 805 }
 806
 807 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 808 {
 809         struct snd_pcm_runtime *runtime = substream->runtime;
 810         if (runtime->trigger_master == NULL)
 811                 return;
 812         if (runtime->trigger_master == substream) {
 813                 if (!runtime->trigger_tstamp_latched)
 814                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 815         } else {
 816                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 817                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 818         }
 819         runtime->trigger_master = NULL;
 820 }
 821
 822 struct action_ops {
 823         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 824         int (*do_action)(struct snd_pcm_substream *substream, int state);
 825         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 826         void (*post_action)(struct snd_pcm_substream *substream, int state);
 827 };
 828
 829 /*
 830  *  this functions is core for handling of linked stream
 831  *  Note: the stream state might be changed also on failure
 832  *  Note2: call with calling stream lock + link lock
 833  */
 834 static int snd_pcm_action_group(struct action_ops *ops,
 835                                 struct snd_pcm_substream *substream,
 836                                 int state, int do_lock)
 837 {
 838         struct snd_pcm_substream *s = NULL;
 839         struct snd_pcm_substream *s1;
 840         int res = 0, depth = 1;
 841
 842         snd_pcm_group_for_each_entry(s, substream) {
 843                 if (do_lock && s != substream) {
 844                         if (s->pcm->nonatomic)
 845                                 mutex_lock_nested(&s->self_group.mutex, depth);
 846                         else
 847                                 spin_lock_nested(&s->self_group.lock, depth);
 848                         depth++;
 849                 }
 850                 res = ops->pre_action(s, state);
 851                 if (res < 0)
 852                         goto _unlock;
 853         }
 854         snd_pcm_group_for_each_entry(s, substream) {
 855                 res = ops->do_action(s, state);
 856                 if (res < 0) {
 857                         if (ops->undo_action) {
 858                                 snd_pcm_group_for_each_entry(s1, substream) {
 859                                         if (s1 == s) /* failed stream */
 860                                                 break;
 861                                         ops->undo_action(s1, state);
 862                                 }
 863                         }
 864                         s = NULL; /* unlock all */
 865                         goto _unlock;
 866                 }
 867         }
 868         snd_pcm_group_for_each_entry(s, substream) {
 869                 ops->post_action(s, state);
 870         }
 871  _unlock:
 872         if (do_lock) {
 873                 /* unlock streams */
 874                 snd_pcm_group_for_each_entry(s1, substream) {
 875                         if (s1 != substream) {
 876                                 if (s1->pcm->nonatomic)
 877                                         mutex_unlock(&s1->self_group.mutex);
 878                                 else
 879                                         spin_unlock(&s1->self_group.lock);
 880                         }
 881                         if (s1 == s)    /* end */
 882                                 break;
 883                 }
 884         }
 885         return res;
 886 }
 887
 888 /*
 889  *  Note: call with stream lock
 890  */
 891 static int snd_pcm_action_single(struct action_ops *ops,
 892                                  struct snd_pcm_substream *substream,
 893                                  int state)
 894 {
 895         int res;
 896
 897         res = ops->pre_action(substream, state);
 898         if (res < 0)
 899                 return res;
 900         res = ops->do_action(substream, state);
 901         if (res == 0)
 902                 ops->post_action(substream, state);
 903         else if (ops->undo_action)
 904                 ops->undo_action(substream, state);
 905         return res;
 906 }
 907
 908 /*
 909  *  Note: call with stream lock
 910  */
 911 static int snd_pcm_action(struct action_ops *ops,
 912                           struct snd_pcm_substream *substream,
 913                           int state)
 914 {
 915         int res;
 916
 917         if (!snd_pcm_stream_linked(substream))
 918                 return snd_pcm_action_single(ops, substream, state);
 919
 920         if (substream->pcm->nonatomic) {
 921                 if (!mutex_trylock(&substream->group->mutex)) {
 922                         mutex_unlock(&substream->self_group.mutex);
 923                         mutex_lock(&substream->group->mutex);
 924                         mutex_lock(&substream->self_group.mutex);
 925                 }
 926                 res = snd_pcm_action_group(ops, substream, state, 1);
 927                 mutex_unlock(&substream->group->mutex);
 928         } else {
 929                 if (!spin_trylock(&substream->group->lock)) {
 930                         spin_unlock(&substream->self_group.lock);
 931                         spin_lock(&substream->group->lock);
 932                         spin_lock(&substream->self_group.lock);
 933                 }
 934                 res = snd_pcm_action_group(ops, substream, state, 1);
 935                 spin_unlock(&substream->group->lock);
 936         }
 937         return res;
 938 }
 939
 940 /*
 941  *  Note: don't use any locks before
 942  */
 943 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 944                                    struct snd_pcm_substream *substream,
 945                                    int state)
 946 {
 947         int res;
 948
 949         snd_pcm_stream_lock_irq(substream);
 950         res = snd_pcm_action(ops, substream, state);
 951         snd_pcm_stream_unlock_irq(substream);
 952         return res;
 953 }
 954
 955 /*
 956  */
 957 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 958                                     struct snd_pcm_substream *substream,
 959                                     int state)
 960 {
 961         int res;
 962
 963         down_read(&snd_pcm_link_rwsem);
 964         if (snd_pcm_stream_linked(substream))
 965                 res = snd_pcm_action_group(ops, substream, state, 0);
 966         else
 967                 res = snd_pcm_action_single(ops, substream, state);
 968         up_read(&snd_pcm_link_rwsem);
 969         return res;
 970 }
 971
 972 /*
 973  * start callbacks
 974  */
 975 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 976 {
 977         struct snd_pcm_runtime *runtime = substream->runtime;
 978         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 979                 return -EBADFD;
 980         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 981             !snd_pcm_playback_data(substream))
 982                 return -EPIPE;
 983         runtime->trigger_tstamp_latched = false;
 984         runtime->trigger_master = substream;
 985         return 0;
 986 }
 987
 988 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 989 {
 990         if (substream->runtime->trigger_master != substream)
 991                 return 0;
 992         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 993 }
 994
 995 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 996 {
 997         if (substream->runtime->trigger_master == substream)
 998                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 999 }
1000
1001 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1002 {
1003         struct snd_pcm_runtime *runtime = substream->runtime;
1004         snd_pcm_trigger_tstamp(substream);
1005         runtime->hw_ptr_jiffies = jiffies;
1006         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1007                                                             runtime->rate;
1008         runtime->status->state = state;
1009         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1010             runtime->silence_size > 0)
1011                 snd_pcm_playback_silence(substream, ULONG_MAX);
1012         if (substream->timer)
1013                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
1014                                  &runtime->trigger_tstamp);
1015 }
1016
1017 static struct action_ops snd_pcm_action_start = {
1018         .pre_action = snd_pcm_pre_start,
1019         .do_action = snd_pcm_do_start,
1020         .undo_action = snd_pcm_undo_start,
1021         .post_action = snd_pcm_post_start
1022 };
1023
1024 /**
1025  * snd_pcm_start - start all linked streams
1026  * @substream: the PCM substream instance
1027  *
1028  * Return: Zero if successful, or a negative error code.
1029  */
1030 int snd_pcm_start(struct snd_pcm_substream *substream)
1031 {
1032         return snd_pcm_action(&snd_pcm_action_start, substream,
1033                               SNDRV_PCM_STATE_RUNNING);
1034 }
1035
1036 /*
1037  * stop callbacks
1038  */
1039 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1040 {
1041         struct snd_pcm_runtime *runtime = substream->runtime;
1042         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1043                 return -EBADFD;
1044         runtime->trigger_master = substream;
1045         return 0;
1046 }
1047
1048 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1049 {
1050         if (substream->runtime->trigger_master == substream &&
1051             snd_pcm_running(substream))
1052                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1053         return 0; /* unconditonally stop all substreams */
1054 }
1055
1056 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1057 {
1058         struct snd_pcm_runtime *runtime = substream->runtime;
1059         if (runtime->status->state != state) {
1060                 snd_pcm_trigger_tstamp(substream);
1061                 runtime->status->state = state;
1062                 if (substream->timer)
1063                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
1064                                          &runtime->trigger_tstamp);
1065         }
1066         wake_up(&runtime->sleep);
1067         wake_up(&runtime->tsleep);
1068 }
1069
1070 static struct action_ops snd_pcm_action_stop = {
1071         .pre_action = snd_pcm_pre_stop,
1072         .do_action = snd_pcm_do_stop,
1073         .post_action = snd_pcm_post_stop
1074 };
1075
1076 /**
1077  * snd_pcm_stop - try to stop all running streams in the substream group
1078  * @substream: the PCM substream instance
1079  * @state: PCM state after stopping the stream
1080  *
1081  * The state of each stream is then changed to the given state unconditionally.
1082  *
1083  * Return: Zero if successful, or a negative error code.
1084  */
1085 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1086 {
1087         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1088 }
1089
1090 EXPORT_SYMBOL(snd_pcm_stop);
1091
1092 /**
1093  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1094  * @substream: the PCM substream
1095  *
1096  * After stopping, the state is changed to SETUP.
1097  * Unlike snd_pcm_stop(), this affects only the given stream.
1098  *
1099  * Return: Zero if succesful, or a negative error code.
1100  */
1101 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1102 {
1103         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1104                                      SNDRV_PCM_STATE_SETUP);
1105 }
1106
1107 /**
1108  * snd_pcm_stop_xrun - stop the running streams as XRUN
1109  * @substream: the PCM substream instance
1110  *
1111  * This stops the given running substream (and all linked substreams) as XRUN.
1112  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1113  *
1114  * Return: Zero if successful, or a negative error code.
1115  */
1116 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1117 {
1118         unsigned long flags;
1119         int ret = 0;
1120
1121         snd_pcm_stream_lock_irqsave(substream, flags);
1122         if (snd_pcm_running(substream))
1123                 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1124         snd_pcm_stream_unlock_irqrestore(substream, flags);
1125         return ret;
1126 }
1127 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1128
1129 /*
1130  * pause callbacks
1131  */
1132 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1133 {
1134         struct snd_pcm_runtime *runtime = substream->runtime;
1135         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1136                 return -ENOSYS;
1137         if (push) {
1138                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1139                         return -EBADFD;
1140         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1141                 return -EBADFD;
1142         runtime->trigger_master = substream;
1143         return 0;
1144 }
1145
1146 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1147 {
1148         if (substream->runtime->trigger_master != substream)
1149                 return 0;
1150         /* some drivers might use hw_ptr to recover from the pause -
1151            update the hw_ptr now */
1152         if (push)
1153                 snd_pcm_update_hw_ptr(substream);
1154         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1155          * a delta between the current jiffies, this gives a large enough
1156          * delta, effectively to skip the check once.
1157          */
1158         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1159         return substream->ops->trigger(substream,
1160                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1161                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1162 }
1163
1164 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1165 {
1166         if (substream->runtime->trigger_master == substream)
1167                 substream->ops->trigger(substream,
1168                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1169                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1170 }
1171
1172 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1173 {
1174         struct snd_pcm_runtime *runtime = substream->runtime;
1175         snd_pcm_trigger_tstamp(substream);
1176         if (push) {
1177                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1178                 if (substream->timer)
1179                         snd_timer_notify(substream->timer,
1180                                          SNDRV_TIMER_EVENT_MPAUSE,
1181                                          &runtime->trigger_tstamp);
1182                 wake_up(&runtime->sleep);
1183                 wake_up(&runtime->tsleep);
1184         } else {
1185                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1186                 if (substream->timer)
1187                         snd_timer_notify(substream->timer,
1188                                          SNDRV_TIMER_EVENT_MCONTINUE,
1189                                          &runtime->trigger_tstamp);
1190         }
1191 }
1192
1193 static struct action_ops snd_pcm_action_pause = {
1194         .pre_action = snd_pcm_pre_pause,
1195         .do_action = snd_pcm_do_pause,
1196         .undo_action = snd_pcm_undo_pause,
1197         .post_action = snd_pcm_post_pause
1198 };
1199
1200 /*
1201  * Push/release the pause for all linked streams.
1202  */
1203 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1204 {
1205         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1206 }
1207
1208 #ifdef CONFIG_PM
1209 /* suspend */
1210
1211 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1212 {
1213         struct snd_pcm_runtime *runtime = substream->runtime;
1214         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1215                 return -EBUSY;
1216         runtime->trigger_master = substream;
1217         return 0;
1218 }
1219
1220 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1221 {
1222         struct snd_pcm_runtime *runtime = substream->runtime;
1223         if (runtime->trigger_master != substream)
1224                 return 0;
1225         if (! snd_pcm_running(substream))
1226                 return 0;
1227         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1228         return 0; /* suspend unconditionally */
1229 }
1230
1231 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1232 {
1233         struct snd_pcm_runtime *runtime = substream->runtime;
1234         snd_pcm_trigger_tstamp(substream);
1235         runtime->status->suspended_state = runtime->status->state;
1236         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1237         if (substream->timer)
1238                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1239                                  &runtime->trigger_tstamp);
1240         wake_up(&runtime->sleep);
1241         wake_up(&runtime->tsleep);
1242 }
1243
1244 static struct action_ops snd_pcm_action_suspend = {
1245         .pre_action = snd_pcm_pre_suspend,
1246         .do_action = snd_pcm_do_suspend,
1247         .post_action = snd_pcm_post_suspend
1248 };
1249
1250 /**
1251  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1252  * @substream: the PCM substream
1253  *
1254  * After this call, all streams are changed to SUSPENDED state.
1255  *
1256  * Return: Zero if successful (or @substream is %NULL), or a negative error
1257  * code.
1258  */
1259 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1260 {
1261         int err;
1262         unsigned long flags;
1263
1264         if (! substream)
1265                 return 0;
1266
1267         snd_pcm_stream_lock_irqsave(substream, flags);
1268         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1269         snd_pcm_stream_unlock_irqrestore(substream, flags);
1270         return err;
1271 }
1272
1273 EXPORT_SYMBOL(snd_pcm_suspend);
1274
1275 /**
1276  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1277  * @pcm: the PCM instance
1278  *
1279  * After this call, all streams are changed to SUSPENDED state.
1280  *
1281  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1282  */
1283 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1284 {
1285         struct snd_pcm_substream *substream;
1286         int stream, err = 0;
1287
1288         if (! pcm)
1289                 return 0;
1290
1291         for (stream = 0; stream < 2; stream++) {
1292                 for (substream = pcm->streams[stream].substream;
1293                      substream; substream = substream->next) {
1294                         /* FIXME: the open/close code should lock this as well */
1295                         if (substream->runtime == NULL)
1296                                 continue;
1297                         err = snd_pcm_suspend(substream);
1298                         if (err < 0 && err != -EBUSY)
1299                                 return err;
1300                 }
1301         }
1302         return 0;
1303 }
1304
1305 EXPORT_SYMBOL(snd_pcm_suspend_all);
1306
1307 /* resume */
1308
1309 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1310 {
1311         struct snd_pcm_runtime *runtime = substream->runtime;
1312         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1313                 return -ENOSYS;
1314         runtime->trigger_master = substream;
1315         return 0;
1316 }
1317
1318 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1319 {
1320         struct snd_pcm_runtime *runtime = substream->runtime;
1321         if (runtime->trigger_master != substream)
1322                 return 0;
1323         /* DMA not running previously? */
1324         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1325             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1326              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1327                 return 0;
1328         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1329 }
1330
1331 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1332 {
1333         if (substream->runtime->trigger_master == substream &&
1334             snd_pcm_running(substream))
1335                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1336 }
1337
1338 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1339 {
1340         struct snd_pcm_runtime *runtime = substream->runtime;
1341         snd_pcm_trigger_tstamp(substream);
1342         runtime->status->state = runtime->status->suspended_state;
1343         if (substream->timer)
1344                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1345                                  &runtime->trigger_tstamp);
1346 }
1347
1348 static struct action_ops snd_pcm_action_resume = {
1349         .pre_action = snd_pcm_pre_resume,
1350         .do_action = snd_pcm_do_resume,
1351         .undo_action = snd_pcm_undo_resume,
1352         .post_action = snd_pcm_post_resume
1353 };
1354
1355 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1356 {
1357         struct snd_card *card = substream->pcm->card;
1358         int res;
1359
1360         snd_power_lock(card);
1361         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1362                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1363         snd_power_unlock(card);
1364         return res;
1365 }
1366
1367 #else
1368
1369 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1370 {
1371         return -ENOSYS;
1372 }
1373
1374 #endif /* CONFIG_PM */
1375
1376 /*
1377  * xrun ioctl
1378  *
1379  * Change the RUNNING stream(s) to XRUN state.
1380  */
1381 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1382 {
1383         struct snd_card *card = substream->pcm->card;
1384         struct snd_pcm_runtime *runtime = substream->runtime;
1385         int result;
1386
1387         snd_power_lock(card);
1388         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1389                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1390                 if (result < 0)
1391                         goto _unlock;
1392         }
1393
1394         snd_pcm_stream_lock_irq(substream);
1395         switch (runtime->status->state) {
1396         case SNDRV_PCM_STATE_XRUN:
1397                 result = 0;     /* already there */
1398                 break;
1399         case SNDRV_PCM_STATE_RUNNING:
1400                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1401                 break;
1402         default:
1403                 result = -EBADFD;
1404         }
1405         snd_pcm_stream_unlock_irq(substream);
1406  _unlock:
1407         snd_power_unlock(card);
1408         return result;
1409 }
1410
1411 /*
1412  * reset ioctl
1413  */
1414 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1415 {
1416         struct snd_pcm_runtime *runtime = substream->runtime;
1417         switch (runtime->status->state) {
1418         case SNDRV_PCM_STATE_RUNNING:
1419         case SNDRV_PCM_STATE_PREPARED:
1420         case SNDRV_PCM_STATE_PAUSED:
1421         case SNDRV_PCM_STATE_SUSPENDED:
1422                 return 0;
1423         default:
1424                 return -EBADFD;
1425         }
1426 }
1427
1428 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1429 {
1430         struct snd_pcm_runtime *runtime = substream->runtime;
1431         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1432         if (err < 0)
1433                 return err;
1434         runtime->hw_ptr_base = 0;
1435         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1436                 runtime->status->hw_ptr % runtime->period_size;
1437         runtime->silence_start = runtime->status->hw_ptr;
1438         runtime->silence_filled = 0;
1439         return 0;
1440 }
1441
1442 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1443 {
1444         struct snd_pcm_runtime *runtime = substream->runtime;
1445         runtime->control->appl_ptr = runtime->status->hw_ptr;
1446         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1447             runtime->silence_size > 0)
1448                 snd_pcm_playback_silence(substream, ULONG_MAX);
1449 }
1450
1451 static struct action_ops snd_pcm_action_reset = {
1452         .pre_action = snd_pcm_pre_reset,
1453         .do_action = snd_pcm_do_reset,
1454         .post_action = snd_pcm_post_reset
1455 };
1456
1457 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1458 {
1459         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1460 }
1461
1462 /*
1463  * prepare ioctl
1464  */
1465 /* we use the second argument for updating f_flags */
1466 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1467                                int f_flags)
1468 {
1469         struct snd_pcm_runtime *runtime = substream->runtime;
1470         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1471             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1472                 return -EBADFD;
1473         if (snd_pcm_running(substream))
1474                 return -EBUSY;
1475         substream->f_flags = f_flags;
1476         return 0;
1477 }
1478
1479 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1480 {
1481         int err;
1482         err = substream->ops->prepare(substream);
1483         if (err < 0)
1484                 return err;
1485         return snd_pcm_do_reset(substream, 0);
1486 }
1487
1488 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1489 {
1490         struct snd_pcm_runtime *runtime = substream->runtime;
1491         runtime->control->appl_ptr = runtime->status->hw_ptr;
1492         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1493 }
1494
1495 static struct action_ops snd_pcm_action_prepare = {
1496         .pre_action = snd_pcm_pre_prepare,
1497         .do_action = snd_pcm_do_prepare,
1498         .post_action = snd_pcm_post_prepare
1499 };
1500
1501 /**
1502  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1503  * @substream: the PCM substream instance
1504  * @file: file to refer f_flags
1505  *
1506  * Return: Zero if successful, or a negative error code.
1507  */
1508 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1509                            struct file *file)
1510 {
1511         int res;
1512         struct snd_card *card = substream->pcm->card;
1513         int f_flags;
1514
1515         if (file)
1516                 f_flags = file->f_flags;
1517         else
1518                 f_flags = substream->f_flags;
1519
1520         snd_power_lock(card);
1521         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1522                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1523                                                substream, f_flags);
1524         snd_power_unlock(card);
1525         return res;
1526 }
1527
1528 /*
1529  * drain ioctl
1530  */
1531
1532 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1533 {
1534         struct snd_pcm_runtime *runtime = substream->runtime;
1535         switch (runtime->status->state) {
1536         case SNDRV_PCM_STATE_OPEN:
1537         case SNDRV_PCM_STATE_DISCONNECTED:
1538         case SNDRV_PCM_STATE_SUSPENDED:
1539                 return -EBADFD;
1540         }
1541         runtime->trigger_master = substream;
1542         return 0;
1543 }
1544
1545 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1546 {
1547         struct snd_pcm_runtime *runtime = substream->runtime;
1548         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1549                 switch (runtime->status->state) {
1550                 case SNDRV_PCM_STATE_PREPARED:
1551                         /* start playback stream if possible */
1552                         if (! snd_pcm_playback_empty(substream)) {
1553                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1554                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1555                         } else {
1556                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1557                         }
1558                         break;
1559                 case SNDRV_PCM_STATE_RUNNING:
1560                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1561                         break;
1562                 case SNDRV_PCM_STATE_XRUN:
1563                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1564                         break;
1565                 default:
1566                         break;
1567                 }
1568         } else {
1569                 /* stop running stream */
1570                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1571                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1572                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1573                         snd_pcm_do_stop(substream, new_state);
1574                         snd_pcm_post_stop(substream, new_state);
1575                 }
1576         }
1577
1578         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1579             runtime->trigger_master == substream &&
1580             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1581                 return substream->ops->trigger(substream,
1582                                                SNDRV_PCM_TRIGGER_DRAIN);
1583
1584         return 0;
1585 }
1586
1587 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1588 {
1589 }
1590
1591 static struct action_ops snd_pcm_action_drain_init = {
1592         .pre_action = snd_pcm_pre_drain_init,
1593         .do_action = snd_pcm_do_drain_init,
1594         .post_action = snd_pcm_post_drain_init
1595 };
1596
1597 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1598
1599 /*
1600  * Drain the stream(s).
1601  * When the substream is linked, sync until the draining of all playback streams
1602  * is finished.
1603  * After this call, all streams are supposed to be either SETUP or DRAINING
1604  * (capture only) state.
1605  */
1606 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1607                          struct file *file)
1608 {
1609         struct snd_card *card;
1610         struct snd_pcm_runtime *runtime;
1611         struct snd_pcm_substream *s;
1612         wait_queue_t wait;
1613         int result = 0;
1614         int nonblock = 0;
1615
1616         card = substream->pcm->card;
1617         runtime = substream->runtime;
1618
1619         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1620                 return -EBADFD;
1621
1622         snd_power_lock(card);
1623         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1624                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1625                 if (result < 0) {
1626                         snd_power_unlock(card);
1627                         return result;
1628                 }
1629         }
1630
1631         if (file) {
1632                 if (file->f_flags & O_NONBLOCK)
1633                         nonblock = 1;
1634         } else if (substream->f_flags & O_NONBLOCK)
1635                 nonblock = 1;
1636
1637         down_read(&snd_pcm_link_rwsem);
1638         snd_pcm_stream_lock_irq(substream);
1639         /* resume pause */
1640         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1641                 snd_pcm_pause(substream, 0);
1642
1643         /* pre-start/stop - all running streams are changed to DRAINING state */
1644         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1645         if (result < 0)
1646                 goto unlock;
1647         /* in non-blocking, we don't wait in ioctl but let caller poll */
1648         if (nonblock) {
1649                 result = -EAGAIN;
1650                 goto unlock;
1651         }
1652
1653         for (;;) {
1654                 long tout;
1655                 struct snd_pcm_runtime *to_check;
1656                 if (signal_pending(current)) {
1657                         result = -ERESTARTSYS;
1658                         break;
1659                 }
1660                 /* find a substream to drain */
1661                 to_check = NULL;
1662                 snd_pcm_group_for_each_entry(s, substream) {
1663                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1664                                 continue;
1665                         runtime = s->runtime;
1666                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1667                                 to_check = runtime;
1668                                 break;
1669                         }
1670                 }
1671                 if (!to_check)
1672                         break; /* all drained */
1673                 init_waitqueue_entry(&wait, current);
1674                 add_wait_queue(&to_check->sleep, &wait);
1675                 snd_pcm_stream_unlock_irq(substream);
1676                 up_read(&snd_pcm_link_rwsem);
1677                 snd_power_unlock(card);
1678                 if (runtime->no_period_wakeup)
1679                         tout = MAX_SCHEDULE_TIMEOUT;
1680                 else {
1681                         tout = 10;
1682                         if (runtime->rate) {
1683                                 long t = runtime->period_size * 2 / runtime->rate;
1684                                 tout = max(t, tout);
1685                         }
1686                         tout = msecs_to_jiffies(tout * 1000);
1687                 }
1688                 tout = schedule_timeout_interruptible(tout);
1689                 snd_power_lock(card);
1690                 down_read(&snd_pcm_link_rwsem);
1691                 snd_pcm_stream_lock_irq(substream);
1692                 remove_wait_queue(&to_check->sleep, &wait);
1693                 if (card->shutdown) {
1694                         result = -ENODEV;
1695                         break;
1696                 }
1697                 if (tout == 0) {
1698                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1699                                 result = -ESTRPIPE;
1700                         else {
1701                                 dev_dbg(substream->pcm->card->dev,
1702                                         "playback drain error (DMA or IRQ trouble?)\n");
1703                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1704                                 result = -EIO;
1705                         }
1706                         break;
1707                 }
1708         }
1709
1710  unlock:
1711         snd_pcm_stream_unlock_irq(substream);
1712         up_read(&snd_pcm_link_rwsem);
1713         snd_power_unlock(card);
1714
1715         return result;
1716 }
1717
1718 /*
1719  * drop ioctl
1720  *
1721  * Immediately put all linked substreams into SETUP state.
1722  */
1723 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1724 {
1725         struct snd_pcm_runtime *runtime;
1726         int result = 0;
1727
1728         if (PCM_RUNTIME_CHECK(substream))
1729                 return -ENXIO;
1730         runtime = substream->runtime;
1731
1732         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1733             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1734             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1735                 return -EBADFD;
1736
1737         snd_pcm_stream_lock_irq(substream);
1738         /* resume pause */
1739         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1740                 snd_pcm_pause(substream, 0);
1741
1742         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1743         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1744         snd_pcm_stream_unlock_irq(substream);
1745
1746         return result;
1747 }
1748
1749
1750 static bool is_pcm_file(struct file *file)
1751 {
1752         struct inode *inode = file_inode(file);
1753         unsigned int minor;
1754
1755         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1756                 return false;
1757         minor = iminor(inode);
1758         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1759                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1760 }
1761
1762 /*
1763  * PCM link handling
1764  */
1765 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1766 {
1767         int res = 0;
1768         struct snd_pcm_file *pcm_file;
1769         struct snd_pcm_substream *substream1;
1770         struct snd_pcm_group *group;
1771         struct fd f = fdget(fd);
1772
1773         if (!f.file)
1774                 return -EBADFD;
1775         if (!is_pcm_file(f.file)) {
1776                 res = -EBADFD;
1777                 goto _badf;
1778         }
1779         pcm_file = f.file->private_data;
1780         substream1 = pcm_file->substream;
1781         group = kmalloc(sizeof(*group), GFP_KERNEL);
1782         if (!group) {
1783                 res = -ENOMEM;
1784                 goto _nolock;
1785         }
1786         down_write(&snd_pcm_link_rwsem);
1787         write_lock_irq(&snd_pcm_link_rwlock);
1788         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1789             substream->runtime->status->state != substream1->runtime->status->state ||
1790             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1791                 res = -EBADFD;
1792                 goto _end;
1793         }
1794         if (snd_pcm_stream_linked(substream1)) {
1795                 res = -EALREADY;
1796                 goto _end;
1797         }
1798         if (!snd_pcm_stream_linked(substream)) {
1799                 substream->group = group;
1800                 group = NULL;
1801                 spin_lock_init(&substream->group->lock);
1802                 mutex_init(&substream->group->mutex);
1803                 INIT_LIST_HEAD(&substream->group->substreams);
1804                 list_add_tail(&substream->link_list, &substream->group->substreams);
1805                 substream->group->count = 1;
1806         }
1807         list_add_tail(&substream1->link_list, &substream->group->substreams);
1808         substream->group->count++;
1809         substream1->group = substream->group;
1810  _end:
1811         write_unlock_irq(&snd_pcm_link_rwlock);
1812         up_write(&snd_pcm_link_rwsem);
1813  _nolock:
1814         snd_card_unref(substream1->pcm->card);
1815         kfree(group);
1816  _badf:
1817         fdput(f);
1818         return res;
1819 }
1820
1821 static void relink_to_local(struct snd_pcm_substream *substream)
1822 {
1823         substream->group = &substream->self_group;
1824         INIT_LIST_HEAD(&substream->self_group.substreams);
1825         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1826 }
1827
1828 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1829 {
1830         struct snd_pcm_substream *s;
1831         int res = 0;
1832
1833         down_write(&snd_pcm_link_rwsem);
1834         write_lock_irq(&snd_pcm_link_rwlock);
1835         if (!snd_pcm_stream_linked(substream)) {
1836                 res = -EALREADY;
1837                 goto _end;
1838         }
1839         list_del(&substream->link_list);
1840         substream->group->count--;
1841         if (substream->group->count == 1) {     /* detach the last stream, too */
1842                 snd_pcm_group_for_each_entry(s, substream) {
1843                         relink_to_local(s);
1844                         break;
1845                 }
1846                 kfree(substream->group);
1847         }
1848         relink_to_local(substream);
1849        _end:
1850         write_unlock_irq(&snd_pcm_link_rwlock);
1851         up_write(&snd_pcm_link_rwsem);
1852         return res;
1853 }
1854
1855 /*
1856  * hw configurator
1857  */
1858 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1859                                struct snd_pcm_hw_rule *rule)
1860 {
1861         struct snd_interval t;
1862         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1863                      hw_param_interval_c(params, rule->deps[1]), &t);
1864         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1865 }
1866
1867 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1868                                struct snd_pcm_hw_rule *rule)
1869 {
1870         struct snd_interval t;
1871         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1872                      hw_param_interval_c(params, rule->deps[1]), &t);
1873         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1874 }
1875
1876 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1877                                    struct snd_pcm_hw_rule *rule)
1878 {
1879         struct snd_interval t;
1880         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1881                          hw_param_interval_c(params, rule->deps[1]),
1882                          (unsigned long) rule->private, &t);
1883         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1884 }
1885
1886 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1887                                    struct snd_pcm_hw_rule *rule)
1888 {
1889         struct snd_interval t;
1890         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1891                          (unsigned long) rule->private,
1892                          hw_param_interval_c(params, rule->deps[1]), &t);
1893         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1894 }
1895
1896 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1897                                   struct snd_pcm_hw_rule *rule)
1898 {
1899         unsigned int k;
1900         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1901         struct snd_mask m;
1902         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1903         snd_mask_any(&m);
1904         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1905                 int bits;
1906                 if (! snd_mask_test(mask, k))
1907                         continue;
1908                 bits = snd_pcm_format_physical_width(k);
1909                 if (bits <= 0)
1910                         continue; /* ignore invalid formats */
1911                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1912                         snd_mask_reset(&m, k);
1913         }
1914         return snd_mask_refine(mask, &m);
1915 }
1916
1917 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1918                                        struct snd_pcm_hw_rule *rule)
1919 {
1920         struct snd_interval t;
1921         unsigned int k;
1922         t.min = UINT_MAX;
1923         t.max = 0;
1924         t.openmin = 0;
1925         t.openmax = 0;
1926         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1927                 int bits;
1928                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1929                         continue;
1930                 bits = snd_pcm_format_physical_width(k);
1931                 if (bits <= 0)
1932                         continue; /* ignore invalid formats */
1933                 if (t.min > (unsigned)bits)
1934                         t.min = bits;
1935                 if (t.max < (unsigned)bits)
1936                         t.max = bits;
1937         }
1938         t.integer = 1;
1939         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1940 }
1941
1942 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1943 #error "Change this table"
1944 #endif
1945
1946 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1947                                  48000, 64000, 88200, 96000, 176400, 192000 };
1948
1949 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1950         .count = ARRAY_SIZE(rates),
1951         .list = rates,
1952 };
1953
1954 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1955                                 struct snd_pcm_hw_rule *rule)
1956 {
1957         struct snd_pcm_hardware *hw = rule->private;
1958         return snd_interval_list(hw_param_interval(params, rule->var),
1959                                  snd_pcm_known_rates.count,
1960                                  snd_pcm_known_rates.list, hw->rates);
1961 }
1962
1963 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1964                                             struct snd_pcm_hw_rule *rule)
1965 {
1966         struct snd_interval t;
1967         struct snd_pcm_substream *substream = rule->private;
1968         t.min = 0;
1969         t.max = substream->buffer_bytes_max;
1970         t.openmin = 0;
1971         t.openmax = 0;
1972         t.integer = 1;
1973         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1974 }
1975
1976 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1977 {
1978         struct snd_pcm_runtime *runtime = substream->runtime;
1979         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1980         int k, err;
1981
1982         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1983                 snd_mask_any(constrs_mask(constrs, k));
1984         }
1985
1986         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1987                 snd_interval_any(constrs_interval(constrs, k));
1988         }
1989
1990         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1991         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1992         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1993         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1994         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1995
1996         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1997                                    snd_pcm_hw_rule_format, NULL,
1998                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1999         if (err < 0)
2000                 return err;
2001         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2002                                   snd_pcm_hw_rule_sample_bits, NULL,
2003                                   SNDRV_PCM_HW_PARAM_FORMAT,
2004                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2005         if (err < 0)
2006                 return err;
2007         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2008                                   snd_pcm_hw_rule_div, NULL,
2009                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2010         if (err < 0)
2011                 return err;
2012         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2013                                   snd_pcm_hw_rule_mul, NULL,
2014                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2015         if (err < 0)
2016                 return err;
2017         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2018                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2019                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2020         if (err < 0)
2021                 return err;
2022         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2023                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2024                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2025         if (err < 0)
2026                 return err;
2027         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2028                                   snd_pcm_hw_rule_div, NULL,
2029                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2030         if (err < 0)
2031                 return err;
2032         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2033                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2034                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2035         if (err < 0)
2036                 return err;
2037         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2038                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2039                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2040         if (err < 0)
2041                 return err;
2042         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2043                                   snd_pcm_hw_rule_div, NULL,
2044                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2045         if (err < 0)
2046                 return err;
2047         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2048                                   snd_pcm_hw_rule_div, NULL,
2049                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2050         if (err < 0)
2051                 return err;
2052         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2053                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2054                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2055         if (err < 0)
2056                 return err;
2057         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2058                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2059                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2060         if (err < 0)
2061                 return err;
2062         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2063                                   snd_pcm_hw_rule_mul, NULL,
2064                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2065         if (err < 0)
2066                 return err;
2067         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2068                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2069                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2070         if (err < 0)
2071                 return err;
2072         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2073                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2074                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2075         if (err < 0)
2076                 return err;
2077         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2078                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2079                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2080         if (err < 0)
2081                 return err;
2082         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2083                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2084                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2085         if (err < 0)
2086                 return err;
2087         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2088                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2089                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2090         if (err < 0)
2091                 return err;
2092         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2093                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2094                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2095         if (err < 0)
2096                 return err;
2097         return 0;
2098 }
2099
2100 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2101 {
2102         struct snd_pcm_runtime *runtime = substream->runtime;
2103         struct snd_pcm_hardware *hw = &runtime->hw;
2104         int err;
2105         unsigned int mask = 0;
2106
2107         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2108                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2109         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2110                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2111         if (hw_support_mmap(substream)) {
2112                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2113                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2114                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2115                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2116                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2117                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2118         }
2119         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2120         if (err < 0)
2121                 return err;
2122
2123         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2124         if (err < 0)
2125                 return err;
2126
2127         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2128         if (err < 0)
2129                 return err;
2130
2131         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2132                                            hw->channels_min, hw->channels_max);
2133         if (err < 0)
2134                 return err;
2135
2136         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2137                                            hw->rate_min, hw->rate_max);
2138         if (err < 0)
2139                 return err;
2140
2141         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2142                                            hw->period_bytes_min, hw->period_bytes_max);
2143         if (err < 0)
2144                 return err;
2145
2146         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2147                                            hw->periods_min, hw->periods_max);
2148         if (err < 0)
2149                 return err;
2150
2151         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2152                                            hw->period_bytes_min, hw->buffer_bytes_max);
2153         if (err < 0)
2154                 return err;
2155
2156         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2157                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2158                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2159         if (err < 0)
2160                 return err;
2161
2162         /* FIXME: remove */
2163         if (runtime->dma_bytes) {
2164                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2165                 if (err < 0)
2166                         return err;
2167         }
2168
2169         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2170                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2171                                           snd_pcm_hw_rule_rate, hw,
2172                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2173                 if (err < 0)
2174                         return err;
2175         }
2176
2177         /* FIXME: this belong to lowlevel */
2178         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2179
2180         return 0;
2181 }
2182
2183 static void pcm_release_private(struct snd_pcm_substream *substream)
2184 {
2185         snd_pcm_unlink(substream);
2186 }
2187
2188 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2189 {
2190         substream->ref_count--;
2191         if (substream->ref_count > 0)
2192                 return;
2193
2194         snd_pcm_drop(substream);
2195         if (substream->hw_opened) {
2196                 if (substream->ops->hw_free != NULL)
2197                         substream->ops->hw_free(substream);
2198                 substream->ops->close(substream);
2199                 substream->hw_opened = 0;
2200         }
2201         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2202                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2203         if (substream->pcm_release) {
2204                 substream->pcm_release(substream);
2205                 substream->pcm_release = NULL;
2206         }
2207         snd_pcm_detach_substream(substream);
2208 }
2209
2210 EXPORT_SYMBOL(snd_pcm_release_substream);
2211
2212 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2213                            struct file *file,
2214                            struct snd_pcm_substream **rsubstream)
2215 {
2216         struct snd_pcm_substream *substream;
2217         int err;
2218
2219         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2220         if (err < 0)
2221                 return err;
2222         if (substream->ref_count > 1) {
2223                 *rsubstream = substream;
2224                 return 0;
2225         }
2226
2227         err = snd_pcm_hw_constraints_init(substream);
2228         if (err < 0) {
2229                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2230                 goto error;
2231         }
2232
2233         if ((err = substream->ops->open(substream)) < 0)
2234                 goto error;
2235
2236         substream->hw_opened = 1;
2237
2238         err = snd_pcm_hw_constraints_complete(substream);
2239         if (err < 0) {
2240                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2241                 goto error;
2242         }
2243
2244         *rsubstream = substream;
2245         return 0;
2246
2247  error:
2248         snd_pcm_release_substream(substream);
2249         return err;
2250 }
2251
2252 EXPORT_SYMBOL(snd_pcm_open_substream);
2253
2254 static int snd_pcm_open_file(struct file *file,
2255                              struct snd_pcm *pcm,
2256                              int stream)
2257 {
2258         struct snd_pcm_file *pcm_file;
2259         struct snd_pcm_substream *substream;
2260         int err;
2261
2262         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2263         if (err < 0)
2264                 return err;
2265
2266         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2267         if (pcm_file == NULL) {
2268                 snd_pcm_release_substream(substream);
2269                 return -ENOMEM;
2270         }
2271         pcm_file->substream = substream;
2272         if (substream->ref_count == 1) {
2273                 substream->file = pcm_file;
2274                 substream->pcm_release = pcm_release_private;
2275         }
2276         file->private_data = pcm_file;
2277
2278         return 0;
2279 }
2280
2281 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2282 {
2283         struct snd_pcm *pcm;
2284         int err = nonseekable_open(inode, file);
2285         if (err < 0)
2286                 return err;
2287         pcm = snd_lookup_minor_data(iminor(inode),
2288                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2289         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2290         if (pcm)
2291                 snd_card_unref(pcm->card);
2292         return err;
2293 }
2294
2295 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2296 {
2297         struct snd_pcm *pcm;
2298         int err = nonseekable_open(inode, file);
2299         if (err < 0)
2300                 return err;
2301         pcm = snd_lookup_minor_data(iminor(inode),
2302                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2303         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2304         if (pcm)
2305                 snd_card_unref(pcm->card);
2306         return err;
2307 }
2308
2309 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2310 {
2311         int err;
2312         wait_queue_t wait;
2313
2314         if (pcm == NULL) {
2315                 err = -ENODEV;
2316                 goto __error1;
2317         }
2318         err = snd_card_file_add(pcm->card, file);
2319         if (err < 0)
2320                 goto __error1;
2321         if (!try_module_get(pcm->card->module)) {
2322                 err = -EFAULT;
2323                 goto __error2;
2324         }
2325         init_waitqueue_entry(&wait, current);
2326         add_wait_queue(&pcm->open_wait, &wait);
2327         mutex_lock(&pcm->open_mutex);
2328         while (1) {
2329                 err = snd_pcm_open_file(file, pcm, stream);
2330                 if (err >= 0)
2331                         break;
2332                 if (err == -EAGAIN) {
2333                         if (file->f_flags & O_NONBLOCK) {
2334                                 err = -EBUSY;
2335                                 break;
2336                         }
2337                 } else
2338                         break;
2339                 set_current_state(TASK_INTERRUPTIBLE);
2340                 mutex_unlock(&pcm->open_mutex);
2341                 schedule();
2342                 mutex_lock(&pcm->open_mutex);
2343                 if (pcm->card->shutdown) {
2344                         err = -ENODEV;
2345                         break;
2346                 }
2347                 if (signal_pending(current)) {
2348                         err = -ERESTARTSYS;
2349                         break;
2350                 }
2351         }
2352         remove_wait_queue(&pcm->open_wait, &wait);
2353         mutex_unlock(&pcm->open_mutex);
2354         if (err < 0)
2355                 goto __error;
2356         return err;
2357
2358       __error:
2359         module_put(pcm->card->module);
2360       __error2:
2361         snd_card_file_remove(pcm->card, file);
2362       __error1:
2363         return err;
2364 }
2365
2366 static int snd_pcm_release(struct inode *inode, struct file *file)
2367 {
2368         struct snd_pcm *pcm;
2369         struct snd_pcm_substream *substream;
2370         struct snd_pcm_file *pcm_file;
2371
2372         pcm_file = file->private_data;
2373         substream = pcm_file->substream;
2374         if (snd_BUG_ON(!substream))
2375                 return -ENXIO;
2376         pcm = substream->pcm;
2377         mutex_lock(&pcm->open_mutex);
2378         snd_pcm_release_substream(substream);
2379         kfree(pcm_file);
2380         mutex_unlock(&pcm->open_mutex);
2381         wake_up(&pcm->open_wait);
2382         module_put(pcm->card->module);
2383         snd_card_file_remove(pcm->card, file);
2384         return 0;
2385 }
2386
2387 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2388                                                  snd_pcm_uframes_t frames)
2389 {
2390         struct snd_pcm_runtime *runtime = substream->runtime;
2391         snd_pcm_sframes_t appl_ptr;
2392         snd_pcm_sframes_t ret;
2393         snd_pcm_sframes_t hw_avail;
2394
2395         if (frames == 0)
2396                 return 0;
2397
2398         snd_pcm_stream_lock_irq(substream);
2399         switch (runtime->status->state) {
2400         case SNDRV_PCM_STATE_PREPARED:
2401                 break;
2402         case SNDRV_PCM_STATE_DRAINING:
2403         case SNDRV_PCM_STATE_RUNNING:
2404                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2405                         break;
2406                 /* Fall through */
2407         case SNDRV_PCM_STATE_XRUN:
2408                 ret = -EPIPE;
2409                 goto __end;
2410         case SNDRV_PCM_STATE_SUSPENDED:
2411                 ret = -ESTRPIPE;
2412                 goto __end;
2413         default:
2414                 ret = -EBADFD;
2415                 goto __end;
2416         }
2417
2418         hw_avail = snd_pcm_playback_hw_avail(runtime);
2419         if (hw_avail <= 0) {
2420                 ret = 0;
2421                 goto __end;
2422         }
2423         if (frames > (snd_pcm_uframes_t)hw_avail)
2424                 frames = hw_avail;
2425         appl_ptr = runtime->control->appl_ptr - frames;
2426         if (appl_ptr < 0)
2427                 appl_ptr += runtime->boundary;
2428         runtime->control->appl_ptr = appl_ptr;
2429         ret = frames;
2430  __end:
2431         snd_pcm_stream_unlock_irq(substream);
2432         return ret;
2433 }
2434
2435 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2436                                                 snd_pcm_uframes_t frames)
2437 {
2438         struct snd_pcm_runtime *runtime = substream->runtime;
2439         snd_pcm_sframes_t appl_ptr;
2440         snd_pcm_sframes_t ret;
2441         snd_pcm_sframes_t hw_avail;
2442
2443         if (frames == 0)
2444                 return 0;
2445
2446         snd_pcm_stream_lock_irq(substream);
2447         switch (runtime->status->state) {
2448         case SNDRV_PCM_STATE_PREPARED:
2449         case SNDRV_PCM_STATE_DRAINING:
2450                 break;
2451         case SNDRV_PCM_STATE_RUNNING:
2452                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2453                         break;
2454                 /* Fall through */
2455         case SNDRV_PCM_STATE_XRUN:
2456                 ret = -EPIPE;
2457                 goto __end;
2458         case SNDRV_PCM_STATE_SUSPENDED:
2459                 ret = -ESTRPIPE;
2460                 goto __end;
2461         default:
2462                 ret = -EBADFD;
2463                 goto __end;
2464         }
2465
2466         hw_avail = snd_pcm_capture_hw_avail(runtime);
2467         if (hw_avail <= 0) {
2468                 ret = 0;
2469                 goto __end;
2470         }
2471         if (frames > (snd_pcm_uframes_t)hw_avail)
2472                 frames = hw_avail;
2473         appl_ptr = runtime->control->appl_ptr - frames;
2474         if (appl_ptr < 0)
2475                 appl_ptr += runtime->boundary;
2476         runtime->control->appl_ptr = appl_ptr;
2477         ret = frames;
2478  __end:
2479         snd_pcm_stream_unlock_irq(substream);
2480         return ret;
2481 }
2482
2483 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2484                                                   snd_pcm_uframes_t frames)
2485 {
2486         struct snd_pcm_runtime *runtime = substream->runtime;
2487         snd_pcm_sframes_t appl_ptr;
2488         snd_pcm_sframes_t ret;
2489         snd_pcm_sframes_t avail;
2490
2491         if (frames == 0)
2492                 return 0;
2493
2494         snd_pcm_stream_lock_irq(substream);
2495         switch (runtime->status->state) {
2496         case SNDRV_PCM_STATE_PREPARED:
2497         case SNDRV_PCM_STATE_PAUSED:
2498                 break;
2499         case SNDRV_PCM_STATE_DRAINING:
2500         case SNDRV_PCM_STATE_RUNNING:
2501                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2502                         break;
2503                 /* Fall through */
2504         case SNDRV_PCM_STATE_XRUN:
2505                 ret = -EPIPE;
2506                 goto __end;
2507         case SNDRV_PCM_STATE_SUSPENDED:
2508                 ret = -ESTRPIPE;
2509                 goto __end;
2510         default:
2511                 ret = -EBADFD;
2512                 goto __end;
2513         }
2514
2515         avail = snd_pcm_playback_avail(runtime);
2516         if (avail <= 0) {
2517                 ret = 0;
2518                 goto __end;
2519         }
2520         if (frames > (snd_pcm_uframes_t)avail)
2521                 frames = avail;
2522         appl_ptr = runtime->control->appl_ptr + frames;
2523         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2524                 appl_ptr -= runtime->boundary;
2525         runtime->control->appl_ptr = appl_ptr;
2526         ret = frames;
2527  __end:
2528         snd_pcm_stream_unlock_irq(substream);
2529         return ret;
2530 }
2531
2532 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2533                                                  snd_pcm_uframes_t frames)
2534 {
2535         struct snd_pcm_runtime *runtime = substream->runtime;
2536         snd_pcm_sframes_t appl_ptr;
2537         snd_pcm_sframes_t ret;
2538         snd_pcm_sframes_t avail;
2539
2540         if (frames == 0)
2541                 return 0;
2542
2543         snd_pcm_stream_lock_irq(substream);
2544         switch (runtime->status->state) {
2545         case SNDRV_PCM_STATE_PREPARED:
2546         case SNDRV_PCM_STATE_DRAINING:
2547         case SNDRV_PCM_STATE_PAUSED:
2548                 break;
2549         case SNDRV_PCM_STATE_RUNNING:
2550                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2551                         break;
2552                 /* Fall through */
2553         case SNDRV_PCM_STATE_XRUN:
2554                 ret = -EPIPE;
2555                 goto __end;
2556         case SNDRV_PCM_STATE_SUSPENDED:
2557                 ret = -ESTRPIPE;
2558                 goto __end;
2559         default:
2560                 ret = -EBADFD;
2561                 goto __end;
2562         }
2563
2564         avail = snd_pcm_capture_avail(runtime);
2565         if (avail <= 0) {
2566                 ret = 0;
2567                 goto __end;
2568         }
2569         if (frames > (snd_pcm_uframes_t)avail)
2570                 frames = avail;
2571         appl_ptr = runtime->control->appl_ptr + frames;
2572         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2573                 appl_ptr -= runtime->boundary;
2574         runtime->control->appl_ptr = appl_ptr;
2575         ret = frames;
2576  __end:
2577         snd_pcm_stream_unlock_irq(substream);
2578         return ret;
2579 }
2580
2581 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2582 {
2583         struct snd_pcm_runtime *runtime = substream->runtime;
2584         int err;
2585
2586         snd_pcm_stream_lock_irq(substream);
2587         switch (runtime->status->state) {
2588         case SNDRV_PCM_STATE_DRAINING:
2589                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2590                         goto __badfd;
2591                 /* Fall through */
2592         case SNDRV_PCM_STATE_RUNNING:
2593                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2594                         break;
2595                 /* Fall through */
2596         case SNDRV_PCM_STATE_PREPARED:
2597         case SNDRV_PCM_STATE_SUSPENDED:
2598                 err = 0;
2599                 break;
2600         case SNDRV_PCM_STATE_XRUN:
2601                 err = -EPIPE;
2602                 break;
2603         default:
2604               __badfd:
2605                 err = -EBADFD;
2606                 break;
2607         }
2608         snd_pcm_stream_unlock_irq(substream);
2609         return err;
2610 }
2611
2612 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2613                          snd_pcm_sframes_t __user *res)
2614 {
2615         struct snd_pcm_runtime *runtime = substream->runtime;
2616         int err;
2617         snd_pcm_sframes_t n = 0;
2618
2619         snd_pcm_stream_lock_irq(substream);
2620         switch (runtime->status->state) {
2621         case SNDRV_PCM_STATE_DRAINING:
2622                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2623                         goto __badfd;
2624                 /* Fall through */
2625         case SNDRV_PCM_STATE_RUNNING:
2626                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2627                         break;
2628                 /* Fall through */
2629         case SNDRV_PCM_STATE_PREPARED:
2630         case SNDRV_PCM_STATE_SUSPENDED:
2631                 err = 0;
2632                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2633                         n = snd_pcm_playback_hw_avail(runtime);
2634                 else
2635                         n = snd_pcm_capture_avail(runtime);
2636                 n += runtime->delay;
2637                 break;
2638         case SNDRV_PCM_STATE_XRUN:
2639                 err = -EPIPE;
2640                 break;
2641         default:
2642               __badfd:
2643                 err = -EBADFD;
2644                 break;
2645         }
2646         snd_pcm_stream_unlock_irq(substream);
2647         if (!err)
2648                 if (put_user(n, res))
2649                         err = -EFAULT;
2650         return err;
2651 }
2652
2653 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2654                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2655 {
2656         struct snd_pcm_runtime *runtime = substream->runtime;
2657         struct snd_pcm_sync_ptr sync_ptr;
2658         volatile struct snd_pcm_mmap_status *status;
2659         volatile struct snd_pcm_mmap_control *control;
2660         int err;
2661
2662         memset(&sync_ptr, 0, sizeof(sync_ptr));
2663         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2664                 return -EFAULT;
2665         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2666                 return -EFAULT;
2667         status = runtime->status;
2668         control = runtime->control;
2669         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2670                 err = snd_pcm_hwsync(substream);
2671                 if (err < 0)
2672                         return err;
2673         }
2674         snd_pcm_stream_lock_irq(substream);
2675         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2676                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2677         else
2678                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2679         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2680                 control->avail_min = sync_ptr.c.control.avail_min;
2681         else
2682                 sync_ptr.c.control.avail_min = control->avail_min;
2683         sync_ptr.s.status.state = status->state;
2684         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2685         sync_ptr.s.status.tstamp = status->tstamp;
2686         sync_ptr.s.status.suspended_state = status->suspended_state;
2687         snd_pcm_stream_unlock_irq(substream);
2688         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2689                 return -EFAULT;
2690         return 0;
2691 }
2692
2693 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2694 {
2695         struct snd_pcm_runtime *runtime = substream->runtime;
2696         int arg;
2697
2698         if (get_user(arg, _arg))
2699                 return -EFAULT;
2700         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2701                 return -EINVAL;
2702         runtime->tstamp_type = arg;
2703         return 0;
2704 }
2705
2706 static int snd_pcm_common_ioctl1(struct file *file,
2707                                  struct snd_pcm_substream *substream,
2708                                  unsigned int cmd, void __user *arg)
2709 {
2710         switch (cmd) {
2711         case SNDRV_PCM_IOCTL_PVERSION:
2712                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2713         case SNDRV_PCM_IOCTL_INFO:
2714                 return snd_pcm_info_user(substream, arg);
2715         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2716                 return 0;
2717         case SNDRV_PCM_IOCTL_TTSTAMP:
2718                 return snd_pcm_tstamp(substream, arg);
2719         case SNDRV_PCM_IOCTL_HW_REFINE:
2720                 return snd_pcm_hw_refine_user(substream, arg);
2721         case SNDRV_PCM_IOCTL_HW_PARAMS:
2722                 return snd_pcm_hw_params_user(substream, arg);
2723         case SNDRV_PCM_IOCTL_HW_FREE:
2724                 return snd_pcm_hw_free(substream);
2725         case SNDRV_PCM_IOCTL_SW_PARAMS:
2726                 return snd_pcm_sw_params_user(substream, arg);
2727         case SNDRV_PCM_IOCTL_STATUS:
2728                 return snd_pcm_status_user(substream, arg);
2729         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2730                 return snd_pcm_channel_info_user(substream, arg);
2731         case SNDRV_PCM_IOCTL_PREPARE:
2732                 return snd_pcm_prepare(substream, file);
2733         case SNDRV_PCM_IOCTL_RESET:
2734                 return snd_pcm_reset(substream);
2735         case SNDRV_PCM_IOCTL_START:
2736                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2737         case SNDRV_PCM_IOCTL_LINK:
2738                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2739         case SNDRV_PCM_IOCTL_UNLINK:
2740                 return snd_pcm_unlink(substream);
2741         case SNDRV_PCM_IOCTL_RESUME:
2742                 return snd_pcm_resume(substream);
2743         case SNDRV_PCM_IOCTL_XRUN:
2744                 return snd_pcm_xrun(substream);
2745         case SNDRV_PCM_IOCTL_HWSYNC:
2746                 return snd_pcm_hwsync(substream);
2747         case SNDRV_PCM_IOCTL_DELAY:
2748                 return snd_pcm_delay(substream, arg);
2749         case SNDRV_PCM_IOCTL_SYNC_PTR:
2750                 return snd_pcm_sync_ptr(substream, arg);
2751 #ifdef CONFIG_SND_SUPPORT_OLD_API
2752         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2753                 return snd_pcm_hw_refine_old_user(substream, arg);
2754         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2755                 return snd_pcm_hw_params_old_user(substream, arg);
2756 #endif
2757         case SNDRV_PCM_IOCTL_DRAIN:
2758                 return snd_pcm_drain(substream, file);
2759         case SNDRV_PCM_IOCTL_DROP:
2760                 return snd_pcm_drop(substream);
2761         case SNDRV_PCM_IOCTL_PAUSE:
2762         {
2763                 int res;
2764                 snd_pcm_stream_lock_irq(substream);
2765                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2766                 snd_pcm_stream_unlock_irq(substream);
2767                 return res;
2768         }
2769         }
2770         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2771         return -ENOTTY;
2772 }
2773
2774 static int snd_pcm_playback_ioctl1(struct file *file,
2775                                    struct snd_pcm_substream *substream,
2776                                    unsigned int cmd, void __user *arg)
2777 {
2778         if (snd_BUG_ON(!substream))
2779                 return -ENXIO;
2780         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2781                 return -EINVAL;
2782         switch (cmd) {
2783         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2784         {
2785                 struct snd_xferi xferi;
2786                 struct snd_xferi __user *_xferi = arg;
2787                 struct snd_pcm_runtime *runtime = substream->runtime;
2788                 snd_pcm_sframes_t result;
2789                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2790                         return -EBADFD;
2791                 if (put_user(0, &_xferi->result))
2792                         return -EFAULT;
2793                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2794                         return -EFAULT;
2795                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2796                 __put_user(result, &_xferi->result);
2797                 return result < 0 ? result : 0;
2798         }
2799         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2800         {
2801                 struct snd_xfern xfern;
2802                 struct snd_xfern __user *_xfern = arg;
2803                 struct snd_pcm_runtime *runtime = substream->runtime;
2804                 void __user **bufs;
2805                 snd_pcm_sframes_t result;
2806                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2807                         return -EBADFD;
2808                 if (runtime->channels > 128)
2809                         return -EINVAL;
2810                 if (put_user(0, &_xfern->result))
2811                         return -EFAULT;
2812                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2813                         return -EFAULT;
2814
2815                 bufs = memdup_user(xfern.bufs,
2816                                    sizeof(void *) * runtime->channels);
2817                 if (IS_ERR(bufs))
2818                         return PTR_ERR(bufs);
2819                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2820                 kfree(bufs);
2821                 __put_user(result, &_xfern->result);
2822                 return result < 0 ? result : 0;
2823         }
2824         case SNDRV_PCM_IOCTL_REWIND:
2825         {
2826                 snd_pcm_uframes_t frames;
2827                 snd_pcm_uframes_t __user *_frames = arg;
2828                 snd_pcm_sframes_t result;
2829                 if (get_user(frames, _frames))
2830                         return -EFAULT;
2831                 if (put_user(0, _frames))
2832                         return -EFAULT;
2833                 result = snd_pcm_playback_rewind(substream, frames);
2834                 __put_user(result, _frames);
2835                 return result < 0 ? result : 0;
2836         }
2837         case SNDRV_PCM_IOCTL_FORWARD:
2838         {
2839                 snd_pcm_uframes_t frames;
2840                 snd_pcm_uframes_t __user *_frames = arg;
2841                 snd_pcm_sframes_t result;
2842                 if (get_user(frames, _frames))
2843                         return -EFAULT;
2844                 if (put_user(0, _frames))
2845                         return -EFAULT;
2846                 result = snd_pcm_playback_forward(substream, frames);
2847                 __put_user(result, _frames);
2848                 return result < 0 ? result : 0;
2849         }
2850         }
2851         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2852 }
2853
2854 static int snd_pcm_capture_ioctl1(struct file *file,
2855                                   struct snd_pcm_substream *substream,
2856                                   unsigned int cmd, void __user *arg)
2857 {
2858         if (snd_BUG_ON(!substream))
2859                 return -ENXIO;
2860         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2861                 return -EINVAL;
2862         switch (cmd) {
2863         case SNDRV_PCM_IOCTL_READI_FRAMES:
2864         {
2865                 struct snd_xferi xferi;
2866                 struct snd_xferi __user *_xferi = arg;
2867                 struct snd_pcm_runtime *runtime = substream->runtime;
2868                 snd_pcm_sframes_t result;
2869                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2870                         return -EBADFD;
2871                 if (put_user(0, &_xferi->result))
2872                         return -EFAULT;
2873                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2874                         return -EFAULT;
2875                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2876                 __put_user(result, &_xferi->result);
2877                 return result < 0 ? result : 0;
2878         }
2879         case SNDRV_PCM_IOCTL_READN_FRAMES:
2880         {
2881                 struct snd_xfern xfern;
2882                 struct snd_xfern __user *_xfern = arg;
2883                 struct snd_pcm_runtime *runtime = substream->runtime;
2884                 void *bufs;
2885                 snd_pcm_sframes_t result;
2886                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2887                         return -EBADFD;
2888                 if (runtime->channels > 128)
2889                         return -EINVAL;
2890                 if (put_user(0, &_xfern->result))
2891                         return -EFAULT;
2892                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2893                         return -EFAULT;
2894
2895                 bufs = memdup_user(xfern.bufs,
2896                                    sizeof(void *) * runtime->channels);
2897                 if (IS_ERR(bufs))
2898                         return PTR_ERR(bufs);
2899                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2900                 kfree(bufs);
2901                 __put_user(result, &_xfern->result);
2902                 return result < 0 ? result : 0;
2903         }
2904         case SNDRV_PCM_IOCTL_REWIND:
2905         {
2906                 snd_pcm_uframes_t frames;
2907                 snd_pcm_uframes_t __user *_frames = arg;
2908                 snd_pcm_sframes_t result;
2909                 if (get_user(frames, _frames))
2910                         return -EFAULT;
2911                 if (put_user(0, _frames))
2912                         return -EFAULT;
2913                 result = snd_pcm_capture_rewind(substream, frames);
2914                 __put_user(result, _frames);
2915                 return result < 0 ? result : 0;
2916         }
2917         case SNDRV_PCM_IOCTL_FORWARD:
2918         {
2919                 snd_pcm_uframes_t frames;
2920                 snd_pcm_uframes_t __user *_frames = arg;
2921                 snd_pcm_sframes_t result;
2922                 if (get_user(frames, _frames))
2923                         return -EFAULT;
2924                 if (put_user(0, _frames))
2925                         return -EFAULT;
2926                 result = snd_pcm_capture_forward(substream, frames);
2927                 __put_user(result, _frames);
2928                 return result < 0 ? result : 0;
2929         }
2930         }
2931         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2932 }
2933
2934 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2935                                    unsigned long arg)
2936 {
2937         struct snd_pcm_file *pcm_file;
2938
2939         pcm_file = file->private_data;
2940
2941         if (((cmd >> 8) & 0xff) != 'A')
2942                 return -ENOTTY;
2943
2944         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2945                                        (void __user *)arg);
2946 }
2947
2948 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2949                                   unsigned long arg)
2950 {
2951         struct snd_pcm_file *pcm_file;
2952
2953         pcm_file = file->private_data;
2954
2955         if (((cmd >> 8) & 0xff) != 'A')
2956                 return -ENOTTY;
2957
2958         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2959                                       (void __user *)arg);
2960 }
2961
2962 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2963                          unsigned int cmd, void *arg)
2964 {
2965         mm_segment_t fs;
2966         int result;
2967
2968         fs = snd_enter_user();
2969         switch (substream->stream) {
2970         case SNDRV_PCM_STREAM_PLAYBACK:
2971                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2972                                                  (void __user *)arg);
2973                 break;
2974         case SNDRV_PCM_STREAM_CAPTURE:
2975                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2976                                                 (void __user *)arg);
2977                 break;
2978         default:
2979                 result = -EINVAL;
2980                 break;
2981         }
2982         snd_leave_user(fs);
2983         return result;
2984 }
2985
2986 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2987
2988 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2989                             loff_t * offset)
2990 {
2991         struct snd_pcm_file *pcm_file;
2992         struct snd_pcm_substream *substream;
2993         struct snd_pcm_runtime *runtime;
2994         snd_pcm_sframes_t result;
2995
2996         pcm_file = file->private_data;
2997         substream = pcm_file->substream;
2998         if (PCM_RUNTIME_CHECK(substream))
2999                 return -ENXIO;
3000         runtime = substream->runtime;
3001         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3002                 return -EBADFD;
3003         if (!frame_aligned(runtime, count))
3004                 return -EINVAL;
3005         count = bytes_to_frames(runtime, count);
3006         result = snd_pcm_lib_read(substream, buf, count);
3007         if (result > 0)
3008                 result = frames_to_bytes(runtime, result);
3009         return result;
3010 }
3011
3012 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3013                              size_t count, loff_t * offset)
3014 {
3015         struct snd_pcm_file *pcm_file;
3016         struct snd_pcm_substream *substream;
3017         struct snd_pcm_runtime *runtime;
3018         snd_pcm_sframes_t result;
3019
3020         pcm_file = file->private_data;
3021         substream = pcm_file->substream;
3022         if (PCM_RUNTIME_CHECK(substream))
3023                 return -ENXIO;
3024         runtime = substream->runtime;
3025         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3026                 return -EBADFD;
3027         if (!frame_aligned(runtime, count))
3028                 return -EINVAL;
3029         count = bytes_to_frames(runtime, count);
3030         result = snd_pcm_lib_write(substream, buf, count);
3031         if (result > 0)
3032                 result = frames_to_bytes(runtime, result);
3033         return result;
3034 }
3035
3036 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
3037                              unsigned long nr_segs, loff_t pos)
3038
3039 {
3040         struct snd_pcm_file *pcm_file;
3041         struct snd_pcm_substream *substream;
3042         struct snd_pcm_runtime *runtime;
3043         snd_pcm_sframes_t result;
3044         unsigned long i;
3045         void __user **bufs;
3046         snd_pcm_uframes_t frames;
3047
3048         pcm_file = iocb->ki_filp->private_data;
3049         substream = pcm_file->substream;
3050         if (PCM_RUNTIME_CHECK(substream))
3051                 return -ENXIO;
3052         runtime = substream->runtime;
3053         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3054                 return -EBADFD;
3055         if (nr_segs > 1024 || nr_segs != runtime->channels)
3056                 return -EINVAL;
3057         if (!frame_aligned(runtime, iov->iov_len))
3058                 return -EINVAL;
3059         frames = bytes_to_samples(runtime, iov->iov_len);
3060         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
3061         if (bufs == NULL)
3062                 return -ENOMEM;
3063         for (i = 0; i < nr_segs; ++i)
3064                 bufs[i] = iov[i].iov_base;
3065         result = snd_pcm_lib_readv(substream, bufs, frames);
3066         if (result > 0)
3067                 result = frames_to_bytes(runtime, result);
3068         kfree(bufs);
3069         return result;
3070 }
3071
3072 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
3073                               unsigned long nr_segs, loff_t pos)
3074 {
3075         struct snd_pcm_file *pcm_file;
3076         struct snd_pcm_substream *substream;
3077         struct snd_pcm_runtime *runtime;
3078         snd_pcm_sframes_t result;
3079         unsigned long i;
3080         void __user **bufs;
3081         snd_pcm_uframes_t frames;
3082
3083         pcm_file = iocb->ki_filp->private_data;
3084         substream = pcm_file->substream;
3085         if (PCM_RUNTIME_CHECK(substream))
3086                 return -ENXIO;
3087         runtime = substream->runtime;
3088         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3089                 return -EBADFD;
3090         if (nr_segs > 128 || nr_segs != runtime->channels ||
3091             !frame_aligned(runtime, iov->iov_len))
3092                 return -EINVAL;
3093         frames = bytes_to_samples(runtime, iov->iov_len);
3094         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
3095         if (bufs == NULL)
3096                 return -ENOMEM;
3097         for (i = 0; i < nr_segs; ++i)
3098                 bufs[i] = iov[i].iov_base;
3099         result = snd_pcm_lib_writev(substream, bufs, frames);
3100         if (result > 0)
3101                 result = frames_to_bytes(runtime, result);
3102         kfree(bufs);
3103         return result;
3104 }
3105
3106 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3107 {
3108         struct snd_pcm_file *pcm_file;
3109         struct snd_pcm_substream *substream;
3110         struct snd_pcm_runtime *runtime;
3111         unsigned int mask;
3112         snd_pcm_uframes_t avail;
3113
3114         pcm_file = file->private_data;
3115
3116         substream = pcm_file->substream;
3117         if (PCM_RUNTIME_CHECK(substream))
3118                 return -ENXIO;
3119         runtime = substream->runtime;
3120
3121         poll_wait(file, &runtime->sleep, wait);
3122
3123         snd_pcm_stream_lock_irq(substream);
3124         avail = snd_pcm_playback_avail(runtime);
3125         switch (runtime->status->state) {
3126         case SNDRV_PCM_STATE_RUNNING:
3127         case SNDRV_PCM_STATE_PREPARED:
3128         case SNDRV_PCM_STATE_PAUSED:
3129                 if (avail >= runtime->control->avail_min) {
3130                         mask = POLLOUT | POLLWRNORM;
3131                         break;
3132                 }
3133                 /* Fall through */
3134         case SNDRV_PCM_STATE_DRAINING:
3135                 mask = 0;
3136                 break;
3137         default:
3138                 mask = POLLOUT | POLLWRNORM | POLLERR;
3139                 break;
3140         }
3141         snd_pcm_stream_unlock_irq(substream);
3142         return mask;
3143 }
3144
3145 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3146 {
3147         struct snd_pcm_file *pcm_file;
3148         struct snd_pcm_substream *substream;
3149         struct snd_pcm_runtime *runtime;
3150         unsigned int mask;
3151         snd_pcm_uframes_t avail;
3152
3153         pcm_file = file->private_data;
3154
3155         substream = pcm_file->substream;
3156         if (PCM_RUNTIME_CHECK(substream))
3157                 return -ENXIO;
3158         runtime = substream->runtime;
3159
3160         poll_wait(file, &runtime->sleep, wait);
3161
3162         snd_pcm_stream_lock_irq(substream);
3163         avail = snd_pcm_capture_avail(runtime);
3164         switch (runtime->status->state) {
3165         case SNDRV_PCM_STATE_RUNNING:
3166         case SNDRV_PCM_STATE_PREPARED:
3167         case SNDRV_PCM_STATE_PAUSED:
3168                 if (avail >= runtime->control->avail_min) {
3169                         mask = POLLIN | POLLRDNORM;
3170                         break;
3171                 }
3172                 mask = 0;
3173                 break;
3174         case SNDRV_PCM_STATE_DRAINING:
3175                 if (avail > 0) {
3176                         mask = POLLIN | POLLRDNORM;
3177                         break;
3178                 }
3179                 /* Fall through */
3180         default:
3181                 mask = POLLIN | POLLRDNORM | POLLERR;
3182                 break;
3183         }
3184         snd_pcm_stream_unlock_irq(substream);
3185         return mask;
3186 }
3187
3188 /*
3189  * mmap support
3190  */
3191
3192 /*
3193  * Only on coherent architectures, we can mmap the status and the control records
3194  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3195  */
3196 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3197 /*
3198  * mmap status record
3199  */
3200 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3201                                                 struct vm_fault *vmf)
3202 {
3203         struct snd_pcm_substream *substream = area->vm_private_data;
3204         struct snd_pcm_runtime *runtime;
3205
3206         if (substream == NULL)
3207                 return VM_FAULT_SIGBUS;
3208         runtime = substream->runtime;
3209         vmf->page = virt_to_page(runtime->status);
3210         get_page(vmf->page);
3211         return 0;
3212 }
3213
3214 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3215 {
3216         .fault =        snd_pcm_mmap_status_fault,
3217 };
3218
3219 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3220                                struct vm_area_struct *area)
3221 {
3222         long size;
3223         if (!(area->vm_flags & VM_READ))
3224                 return -EINVAL;
3225         size = area->vm_end - area->vm_start;
3226         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3227                 return -EINVAL;
3228         area->vm_ops = &snd_pcm_vm_ops_status;
3229         area->vm_private_data = substream;
3230         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3231         return 0;
3232 }
3233
3234 /*
3235  * mmap control record
3236  */
3237 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3238                                                 struct vm_fault *vmf)
3239 {
3240         struct snd_pcm_substream *substream = area->vm_private_data;
3241         struct snd_pcm_runtime *runtime;
3242
3243         if (substream == NULL)
3244                 return VM_FAULT_SIGBUS;
3245         runtime = substream->runtime;
3246         vmf->page = virt_to_page(runtime->control);
3247         get_page(vmf->page);
3248         return 0;
3249 }
3250
3251 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3252 {
3253         .fault =        snd_pcm_mmap_control_fault,
3254 };
3255
3256 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3257                                 struct vm_area_struct *area)
3258 {
3259         long size;
3260         if (!(area->vm_flags & VM_READ))
3261                 return -EINVAL;
3262         size = area->vm_end - area->vm_start;
3263         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3264                 return -EINVAL;
3265         area->vm_ops = &snd_pcm_vm_ops_control;
3266         area->vm_private_data = substream;
3267         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3268         return 0;
3269 }
3270 #else /* ! coherent mmap */
3271 /*
3272  * don't support mmap for status and control records.
3273  */
3274 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3275                                struct vm_area_struct *area)
3276 {
3277         return -ENXIO;
3278 }
3279 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3280                                 struct vm_area_struct *area)
3281 {
3282         return -ENXIO;
3283 }
3284 #endif /* coherent mmap */
3285
3286 static inline struct page *
3287 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3288 {
3289         void *vaddr = substream->runtime->dma_area + ofs;
3290         return virt_to_page(vaddr);
3291 }
3292
3293 /*
3294  * fault callback for mmapping a RAM page
3295  */
3296 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3297                                                 struct vm_fault *vmf)
3298 {
3299         struct snd_pcm_substream *substream = area->vm_private_data;
3300         struct snd_pcm_runtime *runtime;
3301         unsigned long offset;
3302         struct page * page;
3303         size_t dma_bytes;
3304
3305         if (substream == NULL)
3306                 return VM_FAULT_SIGBUS;
3307         runtime = substream->runtime;
3308         offset = vmf->pgoff << PAGE_SHIFT;
3309         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3310         if (offset > dma_bytes - PAGE_SIZE)
3311                 return VM_FAULT_SIGBUS;
3312         if (substream->ops->page)
3313                 page = substream->ops->page(substream, offset);
3314         else
3315                 page = snd_pcm_default_page_ops(substream, offset);
3316         if (!page)
3317                 return VM_FAULT_SIGBUS;
3318         get_page(page);
3319         vmf->page = page;
3320         return 0;
3321 }
3322
3323 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3324         .open =         snd_pcm_mmap_data_open,
3325         .close =        snd_pcm_mmap_data_close,
3326 };
3327
3328 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3329         .open =         snd_pcm_mmap_data_open,
3330         .close =        snd_pcm_mmap_data_close,
3331         .fault =        snd_pcm_mmap_data_fault,
3332 };
3333
3334 /*
3335  * mmap the DMA buffer on RAM
3336  */
3337
3338 /**
3339  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3340  * @substream: PCM substream
3341  * @area: VMA
3342  *
3343  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3344  * this function is invoked implicitly.
3345  */
3346 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3347                              struct vm_area_struct *area)
3348 {
3349         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3350 #ifdef CONFIG_GENERIC_ALLOCATOR
3351         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3352                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3353                 return remap_pfn_range(area, area->vm_start,
3354                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3355                                 area->vm_end - area->vm_start, area->vm_page_prot);
3356         }
3357 #endif /* CONFIG_GENERIC_ALLOCATOR */
3358 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3359         if (!substream->ops->page &&
3360             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3361                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3362                                          area,
3363                                          substream->runtime->dma_area,
3364                                          substream->runtime->dma_addr,
3365                                          area->vm_end - area->vm_start);
3366 #endif /* CONFIG_X86 */
3367         /* mmap with fault handler */
3368         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3369         return 0;
3370 }
3371 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3372
3373 /*
3374  * mmap the DMA buffer on I/O memory area
3375  */
3376 #if SNDRV_PCM_INFO_MMAP_IOMEM
3377 /**
3378  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3379  * @substream: PCM substream
3380  * @area: VMA
3381  *
3382  * When your hardware uses the iomapped pages as the hardware buffer and
3383  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3384  * is supposed to work only on limited architectures.
3385  */
3386 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3387                            struct vm_area_struct *area)
3388 {
3389         struct snd_pcm_runtime *runtime = substream->runtime;;
3390
3391         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3392         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3393 }
3394
3395 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3396 #endif /* SNDRV_PCM_INFO_MMAP */
3397
3398 /*
3399  * mmap DMA buffer
3400  */
3401 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3402                       struct vm_area_struct *area)
3403 {
3404         struct snd_pcm_runtime *runtime;
3405         long size;
3406         unsigned long offset;
3407         size_t dma_bytes;
3408         int err;
3409
3410         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3411                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3412                         return -EINVAL;
3413         } else {
3414                 if (!(area->vm_flags & VM_READ))
3415                         return -EINVAL;
3416         }
3417         runtime = substream->runtime;
3418         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3419                 return -EBADFD;
3420         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3421                 return -ENXIO;
3422         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3423             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3424                 return -EINVAL;
3425         size = area->vm_end - area->vm_start;
3426         offset = area->vm_pgoff << PAGE_SHIFT;
3427         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3428         if ((size_t)size > dma_bytes)
3429                 return -EINVAL;
3430         if (offset > dma_bytes - size)
3431                 return -EINVAL;
3432
3433         area->vm_ops = &snd_pcm_vm_ops_data;
3434         area->vm_private_data = substream;
3435         if (substream->ops->mmap)
3436                 err = substream->ops->mmap(substream, area);
3437         else
3438                 err = snd_pcm_lib_default_mmap(substream, area);
3439         if (!err)
3440                 atomic_inc(&substream->mmap_count);
3441         return err;
3442 }
3443
3444 EXPORT_SYMBOL(snd_pcm_mmap_data);
3445
3446 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3447 {
3448         struct snd_pcm_file * pcm_file;
3449         struct snd_pcm_substream *substream;
3450         unsigned long offset;
3451
3452         pcm_file = file->private_data;
3453         substream = pcm_file->substream;
3454         if (PCM_RUNTIME_CHECK(substream))
3455                 return -ENXIO;
3456
3457         offset = area->vm_pgoff << PAGE_SHIFT;
3458         switch (offset) {
3459         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3460                 if (pcm_file->no_compat_mmap)
3461                         return -ENXIO;
3462                 return snd_pcm_mmap_status(substream, file, area);
3463         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3464                 if (pcm_file->no_compat_mmap)
3465                         return -ENXIO;
3466                 return snd_pcm_mmap_control(substream, file, area);
3467         default:
3468                 return snd_pcm_mmap_data(substream, file, area);
3469         }
3470         return 0;
3471 }
3472
3473 static int snd_pcm_fasync(int fd, struct file * file, int on)
3474 {
3475         struct snd_pcm_file * pcm_file;
3476         struct snd_pcm_substream *substream;
3477         struct snd_pcm_runtime *runtime;
3478
3479         pcm_file = file->private_data;
3480         substream = pcm_file->substream;
3481         if (PCM_RUNTIME_CHECK(substream))
3482                 return -ENXIO;
3483         runtime = substream->runtime;
3484         return fasync_helper(fd, file, on, &runtime->fasync);
3485 }
3486
3487 /*
3488  * ioctl32 compat
3489  */
3490 #ifdef CONFIG_COMPAT
3491 #include "pcm_compat.c"
3492 #else
3493 #define snd_pcm_ioctl_compat    NULL
3494 #endif
3495
3496 /*
3497  *  To be removed helpers to keep binary compatibility
3498  */
3499
3500 #ifdef CONFIG_SND_SUPPORT_OLD_API
3501 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3502 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3503
3504 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3505                                                struct snd_pcm_hw_params_old *oparams)
3506 {
3507         unsigned int i;
3508
3509         memset(params, 0, sizeof(*params));
3510         params->flags = oparams->flags;
3511         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3512                 params->masks[i].bits[0] = oparams->masks[i];
3513         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3514         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3515         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3516         params->info = oparams->info;
3517         params->msbits = oparams->msbits;
3518         params->rate_num = oparams->rate_num;
3519         params->rate_den = oparams->rate_den;
3520         params->fifo_size = oparams->fifo_size;
3521 }
3522
3523 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3524                                              struct snd_pcm_hw_params *params)
3525 {
3526         unsigned int i;
3527
3528         memset(oparams, 0, sizeof(*oparams));
3529         oparams->flags = params->flags;
3530         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3531                 oparams->masks[i] = params->masks[i].bits[0];
3532         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3533         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3534         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3535         oparams->info = params->info;
3536         oparams->msbits = params->msbits;
3537         oparams->rate_num = params->rate_num;
3538         oparams->rate_den = params->rate_den;
3539         oparams->fifo_size = params->fifo_size;
3540 }
3541
3542 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3543                                       struct snd_pcm_hw_params_old __user * _oparams)
3544 {
3545         struct snd_pcm_hw_params *params;
3546         struct snd_pcm_hw_params_old *oparams = NULL;
3547         int err;
3548
3549         params = kmalloc(sizeof(*params), GFP_KERNEL);
3550         if (!params)
3551                 return -ENOMEM;
3552
3553         oparams = memdup_user(_oparams, sizeof(*oparams));
3554         if (IS_ERR(oparams)) {
3555                 err = PTR_ERR(oparams);
3556                 goto out;
3557         }
3558         snd_pcm_hw_convert_from_old_params(params, oparams);
3559         err = snd_pcm_hw_refine(substream, params);
3560         snd_pcm_hw_convert_to_old_params(oparams, params);
3561         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3562                 if (!err)
3563                         err = -EFAULT;
3564         }
3565
3566         kfree(oparams);
3567 out:
3568         kfree(params);
3569         return err;
3570 }
3571
3572 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3573                                       struct snd_pcm_hw_params_old __user * _oparams)
3574 {
3575         struct snd_pcm_hw_params *params;
3576         struct snd_pcm_hw_params_old *oparams = NULL;
3577         int err;
3578
3579         params = kmalloc(sizeof(*params), GFP_KERNEL);
3580         if (!params)
3581                 return -ENOMEM;
3582
3583         oparams = memdup_user(_oparams, sizeof(*oparams));
3584         if (IS_ERR(oparams)) {
3585                 err = PTR_ERR(oparams);
3586                 goto out;
3587         }
3588         snd_pcm_hw_convert_from_old_params(params, oparams);
3589         err = snd_pcm_hw_params(substream, params);
3590         snd_pcm_hw_convert_to_old_params(oparams, params);
3591         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3592                 if (!err)
3593                         err = -EFAULT;
3594         }
3595
3596         kfree(oparams);
3597 out:
3598         kfree(params);
3599         return err;
3600 }
3601 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3602
3603 #ifndef CONFIG_MMU
3604 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3605                                                unsigned long addr,
3606                                                unsigned long len,
3607                                                unsigned long pgoff,
3608                                                unsigned long flags)
3609 {
3610         struct snd_pcm_file *pcm_file = file->private_data;
3611         struct snd_pcm_substream *substream = pcm_file->substream;
3612         struct snd_pcm_runtime *runtime = substream->runtime;
3613         unsigned long offset = pgoff << PAGE_SHIFT;
3614
3615         switch (offset) {
3616         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3617                 return (unsigned long)runtime->status;
3618         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3619                 return (unsigned long)runtime->control;
3620         default:
3621                 return (unsigned long)runtime->dma_area + offset;
3622         }
3623 }
3624 #else
3625 # define snd_pcm_get_unmapped_area NULL
3626 #endif
3627
3628 /*
3629  *  Register section
3630  */
3631
3632 const struct file_operations snd_pcm_f_ops[2] = {
3633         {
3634                 .owner =                THIS_MODULE,
3635                 .write =                snd_pcm_write,
3636                 .aio_write =            snd_pcm_aio_write,
3637                 .open =                 snd_pcm_playback_open,
3638                 .release =              snd_pcm_release,
3639                 .llseek =               no_llseek,
3640                 .poll =                 snd_pcm_playback_poll,
3641                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3642                 .compat_ioctl =         snd_pcm_ioctl_compat,
3643                 .mmap =                 snd_pcm_mmap,
3644                 .fasync =               snd_pcm_fasync,
3645                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3646         },
3647         {
3648                 .owner =                THIS_MODULE,
3649                 .read =                 snd_pcm_read,
3650                 .aio_read =             snd_pcm_aio_read,
3651                 .open =                 snd_pcm_capture_open,
3652                 .release =              snd_pcm_release,
3653                 .llseek =               no_llseek,
3654                 .poll =                 snd_pcm_capture_poll,
3655                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3656                 .compat_ioctl =         snd_pcm_ioctl_compat,
3657                 .mmap =                 snd_pcm_mmap,
3658                 .fasync =               snd_pcm_fasync,
3659                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3660         }
3661 };