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/io.h>
  29 #include <linux/dma-mapping.h>
  30 #include <sound/core.h>
  31 #include <sound/control.h>
  32 #include <sound/info.h>
  33 #include <sound/pcm.h>
  34 #include <sound/pcm_params.h>
  35 #include <sound/timer.h>
  36 #include <sound/minors.h>
  37 #include <linux/uio.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_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
  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
 711         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
 712                                         &runtime->audio_tstamp_config);
 713
 714         /* backwards compatible behavior */
 715         if (runtime->audio_tstamp_config.type_requested ==
 716                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
 717                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
 718                         runtime->audio_tstamp_config.type_requested =
 719                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
 720                 else
 721                         runtime->audio_tstamp_config.type_requested =
 722                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
 723                 runtime->audio_tstamp_report.valid = 0;
 724         } else
 725                 runtime->audio_tstamp_report.valid = 1;
 726
 727         status->state = runtime->status->state;
 728         status->suspended_state = runtime->status->suspended_state;
 729         if (status->state == SNDRV_PCM_STATE_OPEN)
 730                 goto _end;
 731         status->trigger_tstamp = runtime->trigger_tstamp;
 732         if (snd_pcm_running(substream)) {
 733                 snd_pcm_update_hw_ptr(substream);
 734                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 735                         status->tstamp = runtime->status->tstamp;
 736                         status->driver_tstamp = runtime->driver_tstamp;
 737                         status->audio_tstamp =
 738                                 runtime->status->audio_tstamp;
 739                         if (runtime->audio_tstamp_report.valid == 1)
 740                                 /* backwards compatibility, no report provided in COMPAT mode */
 741                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
 742                                                                 &status->audio_tstamp_accuracy,
 743                                                                 &runtime->audio_tstamp_report);
 744
 745                         goto _tstamp_end;
 746                 }
 747         } else {
 748                 /* get tstamp only in fallback mode and only if enabled */
 749                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 750                         snd_pcm_gettime(runtime, &status->tstamp);
 751         }
 752  _tstamp_end:
 753         status->appl_ptr = runtime->control->appl_ptr;
 754         status->hw_ptr = runtime->status->hw_ptr;
 755         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 756                 status->avail = snd_pcm_playback_avail(runtime);
 757                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 758                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 759                         status->delay = runtime->buffer_size - status->avail;
 760                         status->delay += runtime->delay;
 761                 } else
 762                         status->delay = 0;
 763         } else {
 764                 status->avail = snd_pcm_capture_avail(runtime);
 765                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 766                         status->delay = status->avail + runtime->delay;
 767                 else
 768                         status->delay = 0;
 769         }
 770         status->avail_max = runtime->avail_max;
 771         status->overrange = runtime->overrange;
 772         runtime->avail_max = 0;
 773         runtime->overrange = 0;
 774  _end:
 775         snd_pcm_stream_unlock_irq(substream);
 776         return 0;
 777 }
 778
 779 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 780                                struct snd_pcm_status __user * _status,
 781                                bool ext)
 782 {
 783         struct snd_pcm_status status;
 784         int res;
 785
 786         memset(&status, 0, sizeof(status));
 787         /*
 788          * with extension, parameters are read/write,
 789          * get audio_tstamp_data from user,
 790          * ignore rest of status structure
 791          */
 792         if (ext && get_user(status.audio_tstamp_data,
 793                                 (u32 __user *)(&_status->audio_tstamp_data)))
 794                 return -EFAULT;
 795         res = snd_pcm_status(substream, &status);
 796         if (res < 0)
 797                 return res;
 798         if (copy_to_user(_status, &status, sizeof(status)))
 799                 return -EFAULT;
 800         return 0;
 801 }
 802
 803 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 804                                 struct snd_pcm_channel_info * info)
 805 {
 806         struct snd_pcm_runtime *runtime;
 807         unsigned int channel;
 808
 809         channel = info->channel;
 810         runtime = substream->runtime;
 811         snd_pcm_stream_lock_irq(substream);
 812         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 813                 snd_pcm_stream_unlock_irq(substream);
 814                 return -EBADFD;
 815         }
 816         snd_pcm_stream_unlock_irq(substream);
 817         if (channel >= runtime->channels)
 818                 return -EINVAL;
 819         memset(info, 0, sizeof(*info));
 820         info->channel = channel;
 821         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 822 }
 823
 824 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 825                                      struct snd_pcm_channel_info __user * _info)
 826 {
 827         struct snd_pcm_channel_info info;
 828         int res;
 829
 830         if (copy_from_user(&info, _info, sizeof(info)))
 831                 return -EFAULT;
 832         res = snd_pcm_channel_info(substream, &info);
 833         if (res < 0)
 834                 return res;
 835         if (copy_to_user(_info, &info, sizeof(info)))
 836                 return -EFAULT;
 837         return 0;
 838 }
 839
 840 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 841 {
 842         struct snd_pcm_runtime *runtime = substream->runtime;
 843         if (runtime->trigger_master == NULL)
 844                 return;
 845         if (runtime->trigger_master == substream) {
 846                 if (!runtime->trigger_tstamp_latched)
 847                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 848         } else {
 849                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 850                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 851         }
 852         runtime->trigger_master = NULL;
 853 }
 854
 855 struct action_ops {
 856         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 857         int (*do_action)(struct snd_pcm_substream *substream, int state);
 858         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 859         void (*post_action)(struct snd_pcm_substream *substream, int state);
 860 };
 861
 862 /*
 863  *  this functions is core for handling of linked stream
 864  *  Note: the stream state might be changed also on failure
 865  *  Note2: call with calling stream lock + link lock
 866  */
 867 static int snd_pcm_action_group(struct action_ops *ops,
 868                                 struct snd_pcm_substream *substream,
 869                                 int state, int do_lock)
 870 {
 871         struct snd_pcm_substream *s = NULL;
 872         struct snd_pcm_substream *s1;
 873         int res = 0, depth = 1;
 874
 875         snd_pcm_group_for_each_entry(s, substream) {
 876                 if (do_lock && s != substream) {
 877                         if (s->pcm->nonatomic)
 878                                 mutex_lock_nested(&s->self_group.mutex, depth);
 879                         else
 880                                 spin_lock_nested(&s->self_group.lock, depth);
 881                         depth++;
 882                 }
 883                 res = ops->pre_action(s, state);
 884                 if (res < 0)
 885                         goto _unlock;
 886         }
 887         snd_pcm_group_for_each_entry(s, substream) {
 888                 res = ops->do_action(s, state);
 889                 if (res < 0) {
 890                         if (ops->undo_action) {
 891                                 snd_pcm_group_for_each_entry(s1, substream) {
 892                                         if (s1 == s) /* failed stream */
 893                                                 break;
 894                                         ops->undo_action(s1, state);
 895                                 }
 896                         }
 897                         s = NULL; /* unlock all */
 898                         goto _unlock;
 899                 }
 900         }
 901         snd_pcm_group_for_each_entry(s, substream) {
 902                 ops->post_action(s, state);
 903         }
 904  _unlock:
 905         if (do_lock) {
 906                 /* unlock streams */
 907                 snd_pcm_group_for_each_entry(s1, substream) {
 908                         if (s1 != substream) {
 909                                 if (s1->pcm->nonatomic)
 910                                         mutex_unlock(&s1->self_group.mutex);
 911                                 else
 912                                         spin_unlock(&s1->self_group.lock);
 913                         }
 914                         if (s1 == s)    /* end */
 915                                 break;
 916                 }
 917         }
 918         return res;
 919 }
 920
 921 /*
 922  *  Note: call with stream lock
 923  */
 924 static int snd_pcm_action_single(struct action_ops *ops,
 925                                  struct snd_pcm_substream *substream,
 926                                  int state)
 927 {
 928         int res;
 929
 930         res = ops->pre_action(substream, state);
 931         if (res < 0)
 932                 return res;
 933         res = ops->do_action(substream, state);
 934         if (res == 0)
 935                 ops->post_action(substream, state);
 936         else if (ops->undo_action)
 937                 ops->undo_action(substream, state);
 938         return res;
 939 }
 940
 941 /*
 942  *  Note: call with stream lock
 943  */
 944 static int snd_pcm_action(struct action_ops *ops,
 945                           struct snd_pcm_substream *substream,
 946                           int state)
 947 {
 948         int res;
 949
 950         if (!snd_pcm_stream_linked(substream))
 951                 return snd_pcm_action_single(ops, substream, state);
 952
 953         if (substream->pcm->nonatomic) {
 954                 if (!mutex_trylock(&substream->group->mutex)) {
 955                         mutex_unlock(&substream->self_group.mutex);
 956                         mutex_lock(&substream->group->mutex);
 957                         mutex_lock(&substream->self_group.mutex);
 958                 }
 959                 res = snd_pcm_action_group(ops, substream, state, 1);
 960                 mutex_unlock(&substream->group->mutex);
 961         } else {
 962                 if (!spin_trylock(&substream->group->lock)) {
 963                         spin_unlock(&substream->self_group.lock);
 964                         spin_lock(&substream->group->lock);
 965                         spin_lock(&substream->self_group.lock);
 966                 }
 967                 res = snd_pcm_action_group(ops, substream, state, 1);
 968                 spin_unlock(&substream->group->lock);
 969         }
 970         return res;
 971 }
 972
 973 /*
 974  *  Note: don't use any locks before
 975  */
 976 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 977                                    struct snd_pcm_substream *substream,
 978                                    int state)
 979 {
 980         int res;
 981
 982         snd_pcm_stream_lock_irq(substream);
 983         res = snd_pcm_action(ops, substream, state);
 984         snd_pcm_stream_unlock_irq(substream);
 985         return res;
 986 }
 987
 988 /*
 989  */
 990 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 991                                     struct snd_pcm_substream *substream,
 992                                     int state)
 993 {
 994         int res;
 995
 996         down_read(&snd_pcm_link_rwsem);
 997         if (snd_pcm_stream_linked(substream))
 998                 res = snd_pcm_action_group(ops, substream, state, 0);
 999         else
1000                 res = snd_pcm_action_single(ops, substream, state);
1001         up_read(&snd_pcm_link_rwsem);
1002         return res;
1003 }
1004
1005 /*
1006  * start callbacks
1007  */
1008 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1009 {
1010         struct snd_pcm_runtime *runtime = substream->runtime;
1011         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1012                 return -EBADFD;
1013         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1014             !snd_pcm_playback_data(substream))
1015                 return -EPIPE;
1016         runtime->trigger_tstamp_latched = false;
1017         runtime->trigger_master = substream;
1018         return 0;
1019 }
1020
1021 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1022 {
1023         if (substream->runtime->trigger_master != substream)
1024                 return 0;
1025         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1026 }
1027
1028 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1029 {
1030         if (substream->runtime->trigger_master == substream)
1031                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1032 }
1033
1034 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1035 {
1036         struct snd_pcm_runtime *runtime = substream->runtime;
1037         snd_pcm_trigger_tstamp(substream);
1038         runtime->hw_ptr_jiffies = jiffies;
1039         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1040                                                             runtime->rate;
1041         runtime->status->state = state;
1042         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1043             runtime->silence_size > 0)
1044                 snd_pcm_playback_silence(substream, ULONG_MAX);
1045         if (substream->timer)
1046                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
1047                                  &runtime->trigger_tstamp);
1048 }
1049
1050 static struct action_ops snd_pcm_action_start = {
1051         .pre_action = snd_pcm_pre_start,
1052         .do_action = snd_pcm_do_start,
1053         .undo_action = snd_pcm_undo_start,
1054         .post_action = snd_pcm_post_start
1055 };
1056
1057 /**
1058  * snd_pcm_start - start all linked streams
1059  * @substream: the PCM substream instance
1060  *
1061  * Return: Zero if successful, or a negative error code.
1062  */
1063 int snd_pcm_start(struct snd_pcm_substream *substream)
1064 {
1065         return snd_pcm_action(&snd_pcm_action_start, substream,
1066                               SNDRV_PCM_STATE_RUNNING);
1067 }
1068
1069 /*
1070  * stop callbacks
1071  */
1072 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1073 {
1074         struct snd_pcm_runtime *runtime = substream->runtime;
1075         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1076                 return -EBADFD;
1077         runtime->trigger_master = substream;
1078         return 0;
1079 }
1080
1081 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1082 {
1083         if (substream->runtime->trigger_master == substream &&
1084             snd_pcm_running(substream))
1085                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1086         return 0; /* unconditonally stop all substreams */
1087 }
1088
1089 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1090 {
1091         struct snd_pcm_runtime *runtime = substream->runtime;
1092         if (runtime->status->state != state) {
1093                 snd_pcm_trigger_tstamp(substream);
1094                 runtime->status->state = state;
1095                 if (substream->timer)
1096                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
1097                                          &runtime->trigger_tstamp);
1098         }
1099         wake_up(&runtime->sleep);
1100         wake_up(&runtime->tsleep);
1101 }
1102
1103 static struct action_ops snd_pcm_action_stop = {
1104         .pre_action = snd_pcm_pre_stop,
1105         .do_action = snd_pcm_do_stop,
1106         .post_action = snd_pcm_post_stop
1107 };
1108
1109 /**
1110  * snd_pcm_stop - try to stop all running streams in the substream group
1111  * @substream: the PCM substream instance
1112  * @state: PCM state after stopping the stream
1113  *
1114  * The state of each stream is then changed to the given state unconditionally.
1115  *
1116  * Return: Zero if successful, or a negative error code.
1117  */
1118 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1119 {
1120         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1121 }
1122
1123 EXPORT_SYMBOL(snd_pcm_stop);
1124
1125 /**
1126  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1127  * @substream: the PCM substream
1128  *
1129  * After stopping, the state is changed to SETUP.
1130  * Unlike snd_pcm_stop(), this affects only the given stream.
1131  *
1132  * Return: Zero if succesful, or a negative error code.
1133  */
1134 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1135 {
1136         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1137                                      SNDRV_PCM_STATE_SETUP);
1138 }
1139
1140 /**
1141  * snd_pcm_stop_xrun - stop the running streams as XRUN
1142  * @substream: the PCM substream instance
1143  *
1144  * This stops the given running substream (and all linked substreams) as XRUN.
1145  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1146  *
1147  * Return: Zero if successful, or a negative error code.
1148  */
1149 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1150 {
1151         unsigned long flags;
1152         int ret = 0;
1153
1154         snd_pcm_stream_lock_irqsave(substream, flags);
1155         if (snd_pcm_running(substream))
1156                 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1157         snd_pcm_stream_unlock_irqrestore(substream, flags);
1158         return ret;
1159 }
1160 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1161
1162 /*
1163  * pause callbacks
1164  */
1165 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1166 {
1167         struct snd_pcm_runtime *runtime = substream->runtime;
1168         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1169                 return -ENOSYS;
1170         if (push) {
1171                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1172                         return -EBADFD;
1173         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1174                 return -EBADFD;
1175         runtime->trigger_master = substream;
1176         return 0;
1177 }
1178
1179 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1180 {
1181         if (substream->runtime->trigger_master != substream)
1182                 return 0;
1183         /* some drivers might use hw_ptr to recover from the pause -
1184            update the hw_ptr now */
1185         if (push)
1186                 snd_pcm_update_hw_ptr(substream);
1187         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1188          * a delta between the current jiffies, this gives a large enough
1189          * delta, effectively to skip the check once.
1190          */
1191         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1192         return substream->ops->trigger(substream,
1193                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1194                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1195 }
1196
1197 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1198 {
1199         if (substream->runtime->trigger_master == substream)
1200                 substream->ops->trigger(substream,
1201                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1202                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1203 }
1204
1205 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1206 {
1207         struct snd_pcm_runtime *runtime = substream->runtime;
1208         snd_pcm_trigger_tstamp(substream);
1209         if (push) {
1210                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1211                 if (substream->timer)
1212                         snd_timer_notify(substream->timer,
1213                                          SNDRV_TIMER_EVENT_MPAUSE,
1214                                          &runtime->trigger_tstamp);
1215                 wake_up(&runtime->sleep);
1216                 wake_up(&runtime->tsleep);
1217         } else {
1218                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1219                 if (substream->timer)
1220                         snd_timer_notify(substream->timer,
1221                                          SNDRV_TIMER_EVENT_MCONTINUE,
1222                                          &runtime->trigger_tstamp);
1223         }
1224 }
1225
1226 static struct action_ops snd_pcm_action_pause = {
1227         .pre_action = snd_pcm_pre_pause,
1228         .do_action = snd_pcm_do_pause,
1229         .undo_action = snd_pcm_undo_pause,
1230         .post_action = snd_pcm_post_pause
1231 };
1232
1233 /*
1234  * Push/release the pause for all linked streams.
1235  */
1236 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1237 {
1238         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1239 }
1240
1241 #ifdef CONFIG_PM
1242 /* suspend */
1243
1244 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1245 {
1246         struct snd_pcm_runtime *runtime = substream->runtime;
1247         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1248                 return -EBUSY;
1249         runtime->trigger_master = substream;
1250         return 0;
1251 }
1252
1253 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1254 {
1255         struct snd_pcm_runtime *runtime = substream->runtime;
1256         if (runtime->trigger_master != substream)
1257                 return 0;
1258         if (! snd_pcm_running(substream))
1259                 return 0;
1260         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1261         return 0; /* suspend unconditionally */
1262 }
1263
1264 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1265 {
1266         struct snd_pcm_runtime *runtime = substream->runtime;
1267         snd_pcm_trigger_tstamp(substream);
1268         runtime->status->suspended_state = runtime->status->state;
1269         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1270         if (substream->timer)
1271                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1272                                  &runtime->trigger_tstamp);
1273         wake_up(&runtime->sleep);
1274         wake_up(&runtime->tsleep);
1275 }
1276
1277 static struct action_ops snd_pcm_action_suspend = {
1278         .pre_action = snd_pcm_pre_suspend,
1279         .do_action = snd_pcm_do_suspend,
1280         .post_action = snd_pcm_post_suspend
1281 };
1282
1283 /**
1284  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1285  * @substream: the PCM substream
1286  *
1287  * After this call, all streams are changed to SUSPENDED state.
1288  *
1289  * Return: Zero if successful (or @substream is %NULL), or a negative error
1290  * code.
1291  */
1292 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1293 {
1294         int err;
1295         unsigned long flags;
1296
1297         if (! substream)
1298                 return 0;
1299
1300         snd_pcm_stream_lock_irqsave(substream, flags);
1301         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1302         snd_pcm_stream_unlock_irqrestore(substream, flags);
1303         return err;
1304 }
1305
1306 EXPORT_SYMBOL(snd_pcm_suspend);
1307
1308 /**
1309  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1310  * @pcm: the PCM instance
1311  *
1312  * After this call, all streams are changed to SUSPENDED state.
1313  *
1314  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1315  */
1316 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1317 {
1318         struct snd_pcm_substream *substream;
1319         int stream, err = 0;
1320
1321         if (! pcm)
1322                 return 0;
1323
1324         for (stream = 0; stream < 2; stream++) {
1325                 for (substream = pcm->streams[stream].substream;
1326                      substream; substream = substream->next) {
1327                         /* FIXME: the open/close code should lock this as well */
1328                         if (substream->runtime == NULL)
1329                                 continue;
1330                         err = snd_pcm_suspend(substream);
1331                         if (err < 0 && err != -EBUSY)
1332                                 return err;
1333                 }
1334         }
1335         return 0;
1336 }
1337
1338 EXPORT_SYMBOL(snd_pcm_suspend_all);
1339
1340 /* resume */
1341
1342 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1343 {
1344         struct snd_pcm_runtime *runtime = substream->runtime;
1345         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1346                 return -ENOSYS;
1347         runtime->trigger_master = substream;
1348         return 0;
1349 }
1350
1351 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1352 {
1353         struct snd_pcm_runtime *runtime = substream->runtime;
1354         if (runtime->trigger_master != substream)
1355                 return 0;
1356         /* DMA not running previously? */
1357         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1358             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1359              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1360                 return 0;
1361         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1362 }
1363
1364 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1365 {
1366         if (substream->runtime->trigger_master == substream &&
1367             snd_pcm_running(substream))
1368                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1369 }
1370
1371 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1372 {
1373         struct snd_pcm_runtime *runtime = substream->runtime;
1374         snd_pcm_trigger_tstamp(substream);
1375         runtime->status->state = runtime->status->suspended_state;
1376         if (substream->timer)
1377                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1378                                  &runtime->trigger_tstamp);
1379 }
1380
1381 static struct action_ops snd_pcm_action_resume = {
1382         .pre_action = snd_pcm_pre_resume,
1383         .do_action = snd_pcm_do_resume,
1384         .undo_action = snd_pcm_undo_resume,
1385         .post_action = snd_pcm_post_resume
1386 };
1387
1388 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1389 {
1390         struct snd_card *card = substream->pcm->card;
1391         int res;
1392
1393         snd_power_lock(card);
1394         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1395                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1396         snd_power_unlock(card);
1397         return res;
1398 }
1399
1400 #else
1401
1402 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1403 {
1404         return -ENOSYS;
1405 }
1406
1407 #endif /* CONFIG_PM */
1408
1409 /*
1410  * xrun ioctl
1411  *
1412  * Change the RUNNING stream(s) to XRUN state.
1413  */
1414 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1415 {
1416         struct snd_card *card = substream->pcm->card;
1417         struct snd_pcm_runtime *runtime = substream->runtime;
1418         int result;
1419
1420         snd_power_lock(card);
1421         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1422                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1423                 if (result < 0)
1424                         goto _unlock;
1425         }
1426
1427         snd_pcm_stream_lock_irq(substream);
1428         switch (runtime->status->state) {
1429         case SNDRV_PCM_STATE_XRUN:
1430                 result = 0;     /* already there */
1431                 break;
1432         case SNDRV_PCM_STATE_RUNNING:
1433                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1434                 break;
1435         default:
1436                 result = -EBADFD;
1437         }
1438         snd_pcm_stream_unlock_irq(substream);
1439  _unlock:
1440         snd_power_unlock(card);
1441         return result;
1442 }
1443
1444 /*
1445  * reset ioctl
1446  */
1447 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1448 {
1449         struct snd_pcm_runtime *runtime = substream->runtime;
1450         switch (runtime->status->state) {
1451         case SNDRV_PCM_STATE_RUNNING:
1452         case SNDRV_PCM_STATE_PREPARED:
1453         case SNDRV_PCM_STATE_PAUSED:
1454         case SNDRV_PCM_STATE_SUSPENDED:
1455                 return 0;
1456         default:
1457                 return -EBADFD;
1458         }
1459 }
1460
1461 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1462 {
1463         struct snd_pcm_runtime *runtime = substream->runtime;
1464         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1465         if (err < 0)
1466                 return err;
1467         runtime->hw_ptr_base = 0;
1468         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1469                 runtime->status->hw_ptr % runtime->period_size;
1470         runtime->silence_start = runtime->status->hw_ptr;
1471         runtime->silence_filled = 0;
1472         return 0;
1473 }
1474
1475 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1476 {
1477         struct snd_pcm_runtime *runtime = substream->runtime;
1478         runtime->control->appl_ptr = runtime->status->hw_ptr;
1479         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1480             runtime->silence_size > 0)
1481                 snd_pcm_playback_silence(substream, ULONG_MAX);
1482 }
1483
1484 static struct action_ops snd_pcm_action_reset = {
1485         .pre_action = snd_pcm_pre_reset,
1486         .do_action = snd_pcm_do_reset,
1487         .post_action = snd_pcm_post_reset
1488 };
1489
1490 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1491 {
1492         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1493 }
1494
1495 /*
1496  * prepare ioctl
1497  */
1498 /* we use the second argument for updating f_flags */
1499 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1500                                int f_flags)
1501 {
1502         struct snd_pcm_runtime *runtime = substream->runtime;
1503         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1504             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1505                 return -EBADFD;
1506         if (snd_pcm_running(substream))
1507                 return -EBUSY;
1508         substream->f_flags = f_flags;
1509         return 0;
1510 }
1511
1512 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1513 {
1514         int err;
1515         err = substream->ops->prepare(substream);
1516         if (err < 0)
1517                 return err;
1518         return snd_pcm_do_reset(substream, 0);
1519 }
1520
1521 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1522 {
1523         struct snd_pcm_runtime *runtime = substream->runtime;
1524         runtime->control->appl_ptr = runtime->status->hw_ptr;
1525         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1526 }
1527
1528 static struct action_ops snd_pcm_action_prepare = {
1529         .pre_action = snd_pcm_pre_prepare,
1530         .do_action = snd_pcm_do_prepare,
1531         .post_action = snd_pcm_post_prepare
1532 };
1533
1534 /**
1535  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1536  * @substream: the PCM substream instance
1537  * @file: file to refer f_flags
1538  *
1539  * Return: Zero if successful, or a negative error code.
1540  */
1541 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1542                            struct file *file)
1543 {
1544         int res;
1545         struct snd_card *card = substream->pcm->card;
1546         int f_flags;
1547
1548         if (file)
1549                 f_flags = file->f_flags;
1550         else
1551                 f_flags = substream->f_flags;
1552
1553         snd_power_lock(card);
1554         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1555                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1556                                                substream, f_flags);
1557         snd_power_unlock(card);
1558         return res;
1559 }
1560
1561 /*
1562  * drain ioctl
1563  */
1564
1565 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1566 {
1567         struct snd_pcm_runtime *runtime = substream->runtime;
1568         switch (runtime->status->state) {
1569         case SNDRV_PCM_STATE_OPEN:
1570         case SNDRV_PCM_STATE_DISCONNECTED:
1571         case SNDRV_PCM_STATE_SUSPENDED:
1572                 return -EBADFD;
1573         }
1574         runtime->trigger_master = substream;
1575         return 0;
1576 }
1577
1578 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1579 {
1580         struct snd_pcm_runtime *runtime = substream->runtime;
1581         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1582                 switch (runtime->status->state) {
1583                 case SNDRV_PCM_STATE_PREPARED:
1584                         /* start playback stream if possible */
1585                         if (! snd_pcm_playback_empty(substream)) {
1586                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1587                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1588                         } else {
1589                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1590                         }
1591                         break;
1592                 case SNDRV_PCM_STATE_RUNNING:
1593                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1594                         break;
1595                 case SNDRV_PCM_STATE_XRUN:
1596                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1597                         break;
1598                 default:
1599                         break;
1600                 }
1601         } else {
1602                 /* stop running stream */
1603                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1604                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1605                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1606                         snd_pcm_do_stop(substream, new_state);
1607                         snd_pcm_post_stop(substream, new_state);
1608                 }
1609         }
1610
1611         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1612             runtime->trigger_master == substream &&
1613             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1614                 return substream->ops->trigger(substream,
1615                                                SNDRV_PCM_TRIGGER_DRAIN);
1616
1617         return 0;
1618 }
1619
1620 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1621 {
1622 }
1623
1624 static struct action_ops snd_pcm_action_drain_init = {
1625         .pre_action = snd_pcm_pre_drain_init,
1626         .do_action = snd_pcm_do_drain_init,
1627         .post_action = snd_pcm_post_drain_init
1628 };
1629
1630 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1631
1632 /*
1633  * Drain the stream(s).
1634  * When the substream is linked, sync until the draining of all playback streams
1635  * is finished.
1636  * After this call, all streams are supposed to be either SETUP or DRAINING
1637  * (capture only) state.
1638  */
1639 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1640                          struct file *file)
1641 {
1642         struct snd_card *card;
1643         struct snd_pcm_runtime *runtime;
1644         struct snd_pcm_substream *s;
1645         wait_queue_t wait;
1646         int result = 0;
1647         int nonblock = 0;
1648
1649         card = substream->pcm->card;
1650         runtime = substream->runtime;
1651
1652         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1653                 return -EBADFD;
1654
1655         snd_power_lock(card);
1656         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1657                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1658                 if (result < 0) {
1659                         snd_power_unlock(card);
1660                         return result;
1661                 }
1662         }
1663
1664         if (file) {
1665                 if (file->f_flags & O_NONBLOCK)
1666                         nonblock = 1;
1667         } else if (substream->f_flags & O_NONBLOCK)
1668                 nonblock = 1;
1669
1670         down_read(&snd_pcm_link_rwsem);
1671         snd_pcm_stream_lock_irq(substream);
1672         /* resume pause */
1673         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1674                 snd_pcm_pause(substream, 0);
1675
1676         /* pre-start/stop - all running streams are changed to DRAINING state */
1677         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1678         if (result < 0)
1679                 goto unlock;
1680         /* in non-blocking, we don't wait in ioctl but let caller poll */
1681         if (nonblock) {
1682                 result = -EAGAIN;
1683                 goto unlock;
1684         }
1685
1686         for (;;) {
1687                 long tout;
1688                 struct snd_pcm_runtime *to_check;
1689                 if (signal_pending(current)) {
1690                         result = -ERESTARTSYS;
1691                         break;
1692                 }
1693                 /* find a substream to drain */
1694                 to_check = NULL;
1695                 snd_pcm_group_for_each_entry(s, substream) {
1696                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1697                                 continue;
1698                         runtime = s->runtime;
1699                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1700                                 to_check = runtime;
1701                                 break;
1702                         }
1703                 }
1704                 if (!to_check)
1705                         break; /* all drained */
1706                 init_waitqueue_entry(&wait, current);
1707                 add_wait_queue(&to_check->sleep, &wait);
1708                 snd_pcm_stream_unlock_irq(substream);
1709                 up_read(&snd_pcm_link_rwsem);
1710                 snd_power_unlock(card);
1711                 if (runtime->no_period_wakeup)
1712                         tout = MAX_SCHEDULE_TIMEOUT;
1713                 else {
1714                         tout = 10;
1715                         if (runtime->rate) {
1716                                 long t = runtime->period_size * 2 / runtime->rate;
1717                                 tout = max(t, tout);
1718                         }
1719                         tout = msecs_to_jiffies(tout * 1000);
1720                 }
1721                 tout = schedule_timeout_interruptible(tout);
1722                 snd_power_lock(card);
1723                 down_read(&snd_pcm_link_rwsem);
1724                 snd_pcm_stream_lock_irq(substream);
1725                 remove_wait_queue(&to_check->sleep, &wait);
1726                 if (card->shutdown) {
1727                         result = -ENODEV;
1728                         break;
1729                 }
1730                 if (tout == 0) {
1731                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1732                                 result = -ESTRPIPE;
1733                         else {
1734                                 dev_dbg(substream->pcm->card->dev,
1735                                         "playback drain error (DMA or IRQ trouble?)\n");
1736                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1737                                 result = -EIO;
1738                         }
1739                         break;
1740                 }
1741         }
1742
1743  unlock:
1744         snd_pcm_stream_unlock_irq(substream);
1745         up_read(&snd_pcm_link_rwsem);
1746         snd_power_unlock(card);
1747
1748         return result;
1749 }
1750
1751 /*
1752  * drop ioctl
1753  *
1754  * Immediately put all linked substreams into SETUP state.
1755  */
1756 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1757 {
1758         struct snd_pcm_runtime *runtime;
1759         int result = 0;
1760
1761         if (PCM_RUNTIME_CHECK(substream))
1762                 return -ENXIO;
1763         runtime = substream->runtime;
1764
1765         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1766             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1767             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1768                 return -EBADFD;
1769
1770         snd_pcm_stream_lock_irq(substream);
1771         /* resume pause */
1772         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1773                 snd_pcm_pause(substream, 0);
1774
1775         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1776         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1777         snd_pcm_stream_unlock_irq(substream);
1778
1779         return result;
1780 }
1781
1782
1783 static bool is_pcm_file(struct file *file)
1784 {
1785         struct inode *inode = file_inode(file);
1786         unsigned int minor;
1787
1788         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1789                 return false;
1790         minor = iminor(inode);
1791         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1792                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1793 }
1794
1795 /*
1796  * PCM link handling
1797  */
1798 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1799 {
1800         int res = 0;
1801         struct snd_pcm_file *pcm_file;
1802         struct snd_pcm_substream *substream1;
1803         struct snd_pcm_group *group;
1804         struct fd f = fdget(fd);
1805
1806         if (!f.file)
1807                 return -EBADFD;
1808         if (!is_pcm_file(f.file)) {
1809                 res = -EBADFD;
1810                 goto _badf;
1811         }
1812         pcm_file = f.file->private_data;
1813         substream1 = pcm_file->substream;
1814         group = kmalloc(sizeof(*group), GFP_KERNEL);
1815         if (!group) {
1816                 res = -ENOMEM;
1817                 goto _nolock;
1818         }
1819         down_write(&snd_pcm_link_rwsem);
1820         write_lock_irq(&snd_pcm_link_rwlock);
1821         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1822             substream->runtime->status->state != substream1->runtime->status->state ||
1823             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1824                 res = -EBADFD;
1825                 goto _end;
1826         }
1827         if (snd_pcm_stream_linked(substream1)) {
1828                 res = -EALREADY;
1829                 goto _end;
1830         }
1831         if (!snd_pcm_stream_linked(substream)) {
1832                 substream->group = group;
1833                 group = NULL;
1834                 spin_lock_init(&substream->group->lock);
1835                 mutex_init(&substream->group->mutex);
1836                 INIT_LIST_HEAD(&substream->group->substreams);
1837                 list_add_tail(&substream->link_list, &substream->group->substreams);
1838                 substream->group->count = 1;
1839         }
1840         list_add_tail(&substream1->link_list, &substream->group->substreams);
1841         substream->group->count++;
1842         substream1->group = substream->group;
1843  _end:
1844         write_unlock_irq(&snd_pcm_link_rwlock);
1845         up_write(&snd_pcm_link_rwsem);
1846  _nolock:
1847         snd_card_unref(substream1->pcm->card);
1848         kfree(group);
1849  _badf:
1850         fdput(f);
1851         return res;
1852 }
1853
1854 static void relink_to_local(struct snd_pcm_substream *substream)
1855 {
1856         substream->group = &substream->self_group;
1857         INIT_LIST_HEAD(&substream->self_group.substreams);
1858         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1859 }
1860
1861 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1862 {
1863         struct snd_pcm_substream *s;
1864         int res = 0;
1865
1866         down_write(&snd_pcm_link_rwsem);
1867         write_lock_irq(&snd_pcm_link_rwlock);
1868         if (!snd_pcm_stream_linked(substream)) {
1869                 res = -EALREADY;
1870                 goto _end;
1871         }
1872         list_del(&substream->link_list);
1873         substream->group->count--;
1874         if (substream->group->count == 1) {     /* detach the last stream, too */
1875                 snd_pcm_group_for_each_entry(s, substream) {
1876                         relink_to_local(s);
1877                         break;
1878                 }
1879                 kfree(substream->group);
1880         }
1881         relink_to_local(substream);
1882        _end:
1883         write_unlock_irq(&snd_pcm_link_rwlock);
1884         up_write(&snd_pcm_link_rwsem);
1885         return res;
1886 }
1887
1888 /*
1889  * hw configurator
1890  */
1891 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1892                                struct snd_pcm_hw_rule *rule)
1893 {
1894         struct snd_interval t;
1895         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1896                      hw_param_interval_c(params, rule->deps[1]), &t);
1897         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1898 }
1899
1900 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1901                                struct snd_pcm_hw_rule *rule)
1902 {
1903         struct snd_interval t;
1904         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1905                      hw_param_interval_c(params, rule->deps[1]), &t);
1906         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1907 }
1908
1909 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1910                                    struct snd_pcm_hw_rule *rule)
1911 {
1912         struct snd_interval t;
1913         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1914                          hw_param_interval_c(params, rule->deps[1]),
1915                          (unsigned long) rule->private, &t);
1916         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1917 }
1918
1919 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1920                                    struct snd_pcm_hw_rule *rule)
1921 {
1922         struct snd_interval t;
1923         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1924                          (unsigned long) rule->private,
1925                          hw_param_interval_c(params, rule->deps[1]), &t);
1926         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1927 }
1928
1929 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1930                                   struct snd_pcm_hw_rule *rule)
1931 {
1932         unsigned int k;
1933         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1934         struct snd_mask m;
1935         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1936         snd_mask_any(&m);
1937         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1938                 int bits;
1939                 if (! snd_mask_test(mask, k))
1940                         continue;
1941                 bits = snd_pcm_format_physical_width(k);
1942                 if (bits <= 0)
1943                         continue; /* ignore invalid formats */
1944                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1945                         snd_mask_reset(&m, k);
1946         }
1947         return snd_mask_refine(mask, &m);
1948 }
1949
1950 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1951                                        struct snd_pcm_hw_rule *rule)
1952 {
1953         struct snd_interval t;
1954         unsigned int k;
1955         t.min = UINT_MAX;
1956         t.max = 0;
1957         t.openmin = 0;
1958         t.openmax = 0;
1959         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1960                 int bits;
1961                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1962                         continue;
1963                 bits = snd_pcm_format_physical_width(k);
1964                 if (bits <= 0)
1965                         continue; /* ignore invalid formats */
1966                 if (t.min > (unsigned)bits)
1967                         t.min = bits;
1968                 if (t.max < (unsigned)bits)
1969                         t.max = bits;
1970         }
1971         t.integer = 1;
1972         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1973 }
1974
1975 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1976 #error "Change this table"
1977 #endif
1978
1979 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1980                                  48000, 64000, 88200, 96000, 176400, 192000 };
1981
1982 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1983         .count = ARRAY_SIZE(rates),
1984         .list = rates,
1985 };
1986
1987 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1988                                 struct snd_pcm_hw_rule *rule)
1989 {
1990         struct snd_pcm_hardware *hw = rule->private;
1991         return snd_interval_list(hw_param_interval(params, rule->var),
1992                                  snd_pcm_known_rates.count,
1993                                  snd_pcm_known_rates.list, hw->rates);
1994 }
1995
1996 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1997                                             struct snd_pcm_hw_rule *rule)
1998 {
1999         struct snd_interval t;
2000         struct snd_pcm_substream *substream = rule->private;
2001         t.min = 0;
2002         t.max = substream->buffer_bytes_max;
2003         t.openmin = 0;
2004         t.openmax = 0;
2005         t.integer = 1;
2006         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2007 }
2008
2009 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2010 {
2011         struct snd_pcm_runtime *runtime = substream->runtime;
2012         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2013         int k, err;
2014
2015         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2016                 snd_mask_any(constrs_mask(constrs, k));
2017         }
2018
2019         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2020                 snd_interval_any(constrs_interval(constrs, k));
2021         }
2022
2023         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2024         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2025         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2026         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2027         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2028
2029         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2030                                    snd_pcm_hw_rule_format, NULL,
2031                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2032         if (err < 0)
2033                 return err;
2034         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2035                                   snd_pcm_hw_rule_sample_bits, NULL,
2036                                   SNDRV_PCM_HW_PARAM_FORMAT,
2037                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2038         if (err < 0)
2039                 return err;
2040         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2041                                   snd_pcm_hw_rule_div, NULL,
2042                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2043         if (err < 0)
2044                 return err;
2045         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2046                                   snd_pcm_hw_rule_mul, NULL,
2047                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2048         if (err < 0)
2049                 return err;
2050         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2051                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2052                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2053         if (err < 0)
2054                 return err;
2055         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2056                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2057                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2058         if (err < 0)
2059                 return err;
2060         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2061                                   snd_pcm_hw_rule_div, NULL,
2062                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2063         if (err < 0)
2064                 return err;
2065         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2066                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2067                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2068         if (err < 0)
2069                 return err;
2070         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2071                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2072                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2073         if (err < 0)
2074                 return err;
2075         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2076                                   snd_pcm_hw_rule_div, NULL,
2077                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2078         if (err < 0)
2079                 return err;
2080         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2081                                   snd_pcm_hw_rule_div, NULL,
2082                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2083         if (err < 0)
2084                 return err;
2085         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2086                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2087                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2088         if (err < 0)
2089                 return err;
2090         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2091                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2092                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2093         if (err < 0)
2094                 return err;
2095         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2096                                   snd_pcm_hw_rule_mul, NULL,
2097                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2098         if (err < 0)
2099                 return err;
2100         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2101                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2102                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2103         if (err < 0)
2104                 return err;
2105         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2106                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2107                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2108         if (err < 0)
2109                 return err;
2110         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2111                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2112                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2113         if (err < 0)
2114                 return err;
2115         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2116                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2117                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2118         if (err < 0)
2119                 return err;
2120         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2121                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2122                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2123         if (err < 0)
2124                 return err;
2125         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2126                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2127                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2128         if (err < 0)
2129                 return err;
2130         return 0;
2131 }
2132
2133 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2134 {
2135         struct snd_pcm_runtime *runtime = substream->runtime;
2136         struct snd_pcm_hardware *hw = &runtime->hw;
2137         int err;
2138         unsigned int mask = 0;
2139
2140         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2141                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2142         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2143                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2144         if (hw_support_mmap(substream)) {
2145                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2146                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2147                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2148                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2149                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2150                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2151         }
2152         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2153         if (err < 0)
2154                 return err;
2155
2156         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2157         if (err < 0)
2158                 return err;
2159
2160         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2161         if (err < 0)
2162                 return err;
2163
2164         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2165                                            hw->channels_min, hw->channels_max);
2166         if (err < 0)
2167                 return err;
2168
2169         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2170                                            hw->rate_min, hw->rate_max);
2171         if (err < 0)
2172                 return err;
2173
2174         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2175                                            hw->period_bytes_min, hw->period_bytes_max);
2176         if (err < 0)
2177                 return err;
2178
2179         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2180                                            hw->periods_min, hw->periods_max);
2181         if (err < 0)
2182                 return err;
2183
2184         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2185                                            hw->period_bytes_min, hw->buffer_bytes_max);
2186         if (err < 0)
2187                 return err;
2188
2189         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2190                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2191                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2192         if (err < 0)
2193                 return err;
2194
2195         /* FIXME: remove */
2196         if (runtime->dma_bytes) {
2197                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2198                 if (err < 0)
2199                         return err;
2200         }
2201
2202         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2203                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2204                                           snd_pcm_hw_rule_rate, hw,
2205                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2206                 if (err < 0)
2207                         return err;
2208         }
2209
2210         /* FIXME: this belong to lowlevel */
2211         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2212
2213         return 0;
2214 }
2215
2216 static void pcm_release_private(struct snd_pcm_substream *substream)
2217 {
2218         snd_pcm_unlink(substream);
2219 }
2220
2221 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2222 {
2223         substream->ref_count--;
2224         if (substream->ref_count > 0)
2225                 return;
2226
2227         snd_pcm_drop(substream);
2228         if (substream->hw_opened) {
2229                 if (substream->ops->hw_free != NULL)
2230                         substream->ops->hw_free(substream);
2231                 substream->ops->close(substream);
2232                 substream->hw_opened = 0;
2233         }
2234         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2235                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2236         if (substream->pcm_release) {
2237                 substream->pcm_release(substream);
2238                 substream->pcm_release = NULL;
2239         }
2240         snd_pcm_detach_substream(substream);
2241 }
2242
2243 EXPORT_SYMBOL(snd_pcm_release_substream);
2244
2245 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2246                            struct file *file,
2247                            struct snd_pcm_substream **rsubstream)
2248 {
2249         struct snd_pcm_substream *substream;
2250         int err;
2251
2252         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2253         if (err < 0)
2254                 return err;
2255         if (substream->ref_count > 1) {
2256                 *rsubstream = substream;
2257                 return 0;
2258         }
2259
2260         err = snd_pcm_hw_constraints_init(substream);
2261         if (err < 0) {
2262                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2263                 goto error;
2264         }
2265
2266         if ((err = substream->ops->open(substream)) < 0)
2267                 goto error;
2268
2269         substream->hw_opened = 1;
2270
2271         err = snd_pcm_hw_constraints_complete(substream);
2272         if (err < 0) {
2273                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2274                 goto error;
2275         }
2276
2277         *rsubstream = substream;
2278         return 0;
2279
2280  error:
2281         snd_pcm_release_substream(substream);
2282         return err;
2283 }
2284
2285 EXPORT_SYMBOL(snd_pcm_open_substream);
2286
2287 static int snd_pcm_open_file(struct file *file,
2288                              struct snd_pcm *pcm,
2289                              int stream)
2290 {
2291         struct snd_pcm_file *pcm_file;
2292         struct snd_pcm_substream *substream;
2293         int err;
2294
2295         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2296         if (err < 0)
2297                 return err;
2298
2299         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2300         if (pcm_file == NULL) {
2301                 snd_pcm_release_substream(substream);
2302                 return -ENOMEM;
2303         }
2304         pcm_file->substream = substream;
2305         if (substream->ref_count == 1) {
2306                 substream->file = pcm_file;
2307                 substream->pcm_release = pcm_release_private;
2308         }
2309         file->private_data = pcm_file;
2310
2311         return 0;
2312 }
2313
2314 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2315 {
2316         struct snd_pcm *pcm;
2317         int err = nonseekable_open(inode, file);
2318         if (err < 0)
2319                 return err;
2320         pcm = snd_lookup_minor_data(iminor(inode),
2321                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2322         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2323         if (pcm)
2324                 snd_card_unref(pcm->card);
2325         return err;
2326 }
2327
2328 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2329 {
2330         struct snd_pcm *pcm;
2331         int err = nonseekable_open(inode, file);
2332         if (err < 0)
2333                 return err;
2334         pcm = snd_lookup_minor_data(iminor(inode),
2335                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2336         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2337         if (pcm)
2338                 snd_card_unref(pcm->card);
2339         return err;
2340 }
2341
2342 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2343 {
2344         int err;
2345         wait_queue_t wait;
2346
2347         if (pcm == NULL) {
2348                 err = -ENODEV;
2349                 goto __error1;
2350         }
2351         err = snd_card_file_add(pcm->card, file);
2352         if (err < 0)
2353                 goto __error1;
2354         if (!try_module_get(pcm->card->module)) {
2355                 err = -EFAULT;
2356                 goto __error2;
2357         }
2358         init_waitqueue_entry(&wait, current);
2359         add_wait_queue(&pcm->open_wait, &wait);
2360         mutex_lock(&pcm->open_mutex);
2361         while (1) {
2362                 err = snd_pcm_open_file(file, pcm, stream);
2363                 if (err >= 0)
2364                         break;
2365                 if (err == -EAGAIN) {
2366                         if (file->f_flags & O_NONBLOCK) {
2367                                 err = -EBUSY;
2368                                 break;
2369                         }
2370                 } else
2371                         break;
2372                 set_current_state(TASK_INTERRUPTIBLE);
2373                 mutex_unlock(&pcm->open_mutex);
2374                 schedule();
2375                 mutex_lock(&pcm->open_mutex);
2376                 if (pcm->card->shutdown) {
2377                         err = -ENODEV;
2378                         break;
2379                 }
2380                 if (signal_pending(current)) {
2381                         err = -ERESTARTSYS;
2382                         break;
2383                 }
2384         }
2385         remove_wait_queue(&pcm->open_wait, &wait);
2386         mutex_unlock(&pcm->open_mutex);
2387         if (err < 0)
2388                 goto __error;
2389         return err;
2390
2391       __error:
2392         module_put(pcm->card->module);
2393       __error2:
2394         snd_card_file_remove(pcm->card, file);
2395       __error1:
2396         return err;
2397 }
2398
2399 static int snd_pcm_release(struct inode *inode, struct file *file)
2400 {
2401         struct snd_pcm *pcm;
2402         struct snd_pcm_substream *substream;
2403         struct snd_pcm_file *pcm_file;
2404
2405         pcm_file = file->private_data;
2406         substream = pcm_file->substream;
2407         if (snd_BUG_ON(!substream))
2408                 return -ENXIO;
2409         pcm = substream->pcm;
2410         mutex_lock(&pcm->open_mutex);
2411         snd_pcm_release_substream(substream);
2412         kfree(pcm_file);
2413         mutex_unlock(&pcm->open_mutex);
2414         wake_up(&pcm->open_wait);
2415         module_put(pcm->card->module);
2416         snd_card_file_remove(pcm->card, file);
2417         return 0;
2418 }
2419
2420 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2421                                                  snd_pcm_uframes_t frames)
2422 {
2423         struct snd_pcm_runtime *runtime = substream->runtime;
2424         snd_pcm_sframes_t appl_ptr;
2425         snd_pcm_sframes_t ret;
2426         snd_pcm_sframes_t hw_avail;
2427
2428         if (frames == 0)
2429                 return 0;
2430
2431         snd_pcm_stream_lock_irq(substream);
2432         switch (runtime->status->state) {
2433         case SNDRV_PCM_STATE_PREPARED:
2434                 break;
2435         case SNDRV_PCM_STATE_DRAINING:
2436         case SNDRV_PCM_STATE_RUNNING:
2437                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2438                         break;
2439                 /* Fall through */
2440         case SNDRV_PCM_STATE_XRUN:
2441                 ret = -EPIPE;
2442                 goto __end;
2443         case SNDRV_PCM_STATE_SUSPENDED:
2444                 ret = -ESTRPIPE;
2445                 goto __end;
2446         default:
2447                 ret = -EBADFD;
2448                 goto __end;
2449         }
2450
2451         hw_avail = snd_pcm_playback_hw_avail(runtime);
2452         if (hw_avail <= 0) {
2453                 ret = 0;
2454                 goto __end;
2455         }
2456         if (frames > (snd_pcm_uframes_t)hw_avail)
2457                 frames = hw_avail;
2458         appl_ptr = runtime->control->appl_ptr - frames;
2459         if (appl_ptr < 0)
2460                 appl_ptr += runtime->boundary;
2461         runtime->control->appl_ptr = appl_ptr;
2462         ret = frames;
2463  __end:
2464         snd_pcm_stream_unlock_irq(substream);
2465         return ret;
2466 }
2467
2468 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2469                                                 snd_pcm_uframes_t frames)
2470 {
2471         struct snd_pcm_runtime *runtime = substream->runtime;
2472         snd_pcm_sframes_t appl_ptr;
2473         snd_pcm_sframes_t ret;
2474         snd_pcm_sframes_t hw_avail;
2475
2476         if (frames == 0)
2477                 return 0;
2478
2479         snd_pcm_stream_lock_irq(substream);
2480         switch (runtime->status->state) {
2481         case SNDRV_PCM_STATE_PREPARED:
2482         case SNDRV_PCM_STATE_DRAINING:
2483                 break;
2484         case SNDRV_PCM_STATE_RUNNING:
2485                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2486                         break;
2487                 /* Fall through */
2488         case SNDRV_PCM_STATE_XRUN:
2489                 ret = -EPIPE;
2490                 goto __end;
2491         case SNDRV_PCM_STATE_SUSPENDED:
2492                 ret = -ESTRPIPE;
2493                 goto __end;
2494         default:
2495                 ret = -EBADFD;
2496                 goto __end;
2497         }
2498
2499         hw_avail = snd_pcm_capture_hw_avail(runtime);
2500         if (hw_avail <= 0) {
2501                 ret = 0;
2502                 goto __end;
2503         }
2504         if (frames > (snd_pcm_uframes_t)hw_avail)
2505                 frames = hw_avail;
2506         appl_ptr = runtime->control->appl_ptr - frames;
2507         if (appl_ptr < 0)
2508                 appl_ptr += runtime->boundary;
2509         runtime->control->appl_ptr = appl_ptr;
2510         ret = frames;
2511  __end:
2512         snd_pcm_stream_unlock_irq(substream);
2513         return ret;
2514 }
2515
2516 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2517                                                   snd_pcm_uframes_t frames)
2518 {
2519         struct snd_pcm_runtime *runtime = substream->runtime;
2520         snd_pcm_sframes_t appl_ptr;
2521         snd_pcm_sframes_t ret;
2522         snd_pcm_sframes_t avail;
2523
2524         if (frames == 0)
2525                 return 0;
2526
2527         snd_pcm_stream_lock_irq(substream);
2528         switch (runtime->status->state) {
2529         case SNDRV_PCM_STATE_PREPARED:
2530         case SNDRV_PCM_STATE_PAUSED:
2531                 break;
2532         case SNDRV_PCM_STATE_DRAINING:
2533         case SNDRV_PCM_STATE_RUNNING:
2534                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2535                         break;
2536                 /* Fall through */
2537         case SNDRV_PCM_STATE_XRUN:
2538                 ret = -EPIPE;
2539                 goto __end;
2540         case SNDRV_PCM_STATE_SUSPENDED:
2541                 ret = -ESTRPIPE;
2542                 goto __end;
2543         default:
2544                 ret = -EBADFD;
2545                 goto __end;
2546         }
2547
2548         avail = snd_pcm_playback_avail(runtime);
2549         if (avail <= 0) {
2550                 ret = 0;
2551                 goto __end;
2552         }
2553         if (frames > (snd_pcm_uframes_t)avail)
2554                 frames = avail;
2555         appl_ptr = runtime->control->appl_ptr + frames;
2556         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2557                 appl_ptr -= runtime->boundary;
2558         runtime->control->appl_ptr = appl_ptr;
2559         ret = frames;
2560  __end:
2561         snd_pcm_stream_unlock_irq(substream);
2562         return ret;
2563 }
2564
2565 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2566                                                  snd_pcm_uframes_t frames)
2567 {
2568         struct snd_pcm_runtime *runtime = substream->runtime;
2569         snd_pcm_sframes_t appl_ptr;
2570         snd_pcm_sframes_t ret;
2571         snd_pcm_sframes_t avail;
2572
2573         if (frames == 0)
2574                 return 0;
2575
2576         snd_pcm_stream_lock_irq(substream);
2577         switch (runtime->status->state) {
2578         case SNDRV_PCM_STATE_PREPARED:
2579         case SNDRV_PCM_STATE_DRAINING:
2580         case SNDRV_PCM_STATE_PAUSED:
2581                 break;
2582         case SNDRV_PCM_STATE_RUNNING:
2583                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2584                         break;
2585                 /* Fall through */
2586         case SNDRV_PCM_STATE_XRUN:
2587                 ret = -EPIPE;
2588                 goto __end;
2589         case SNDRV_PCM_STATE_SUSPENDED:
2590                 ret = -ESTRPIPE;
2591                 goto __end;
2592         default:
2593                 ret = -EBADFD;
2594                 goto __end;
2595         }
2596
2597         avail = snd_pcm_capture_avail(runtime);
2598         if (avail <= 0) {
2599                 ret = 0;
2600                 goto __end;
2601         }
2602         if (frames > (snd_pcm_uframes_t)avail)
2603                 frames = avail;
2604         appl_ptr = runtime->control->appl_ptr + frames;
2605         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2606                 appl_ptr -= runtime->boundary;
2607         runtime->control->appl_ptr = appl_ptr;
2608         ret = frames;
2609  __end:
2610         snd_pcm_stream_unlock_irq(substream);
2611         return ret;
2612 }
2613
2614 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2615 {
2616         struct snd_pcm_runtime *runtime = substream->runtime;
2617         int err;
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                 break;
2633         case SNDRV_PCM_STATE_XRUN:
2634                 err = -EPIPE;
2635                 break;
2636         default:
2637               __badfd:
2638                 err = -EBADFD;
2639                 break;
2640         }
2641         snd_pcm_stream_unlock_irq(substream);
2642         return err;
2643 }
2644
2645 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2646                          snd_pcm_sframes_t __user *res)
2647 {
2648         struct snd_pcm_runtime *runtime = substream->runtime;
2649         int err;
2650         snd_pcm_sframes_t n = 0;
2651
2652         snd_pcm_stream_lock_irq(substream);
2653         switch (runtime->status->state) {
2654         case SNDRV_PCM_STATE_DRAINING:
2655                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2656                         goto __badfd;
2657                 /* Fall through */
2658         case SNDRV_PCM_STATE_RUNNING:
2659                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2660                         break;
2661                 /* Fall through */
2662         case SNDRV_PCM_STATE_PREPARED:
2663         case SNDRV_PCM_STATE_SUSPENDED:
2664                 err = 0;
2665                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2666                         n = snd_pcm_playback_hw_avail(runtime);
2667                 else
2668                         n = snd_pcm_capture_avail(runtime);
2669                 n += runtime->delay;
2670                 break;
2671         case SNDRV_PCM_STATE_XRUN:
2672                 err = -EPIPE;
2673                 break;
2674         default:
2675               __badfd:
2676                 err = -EBADFD;
2677                 break;
2678         }
2679         snd_pcm_stream_unlock_irq(substream);
2680         if (!err)
2681                 if (put_user(n, res))
2682                         err = -EFAULT;
2683         return err;
2684 }
2685
2686 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2687                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2688 {
2689         struct snd_pcm_runtime *runtime = substream->runtime;
2690         struct snd_pcm_sync_ptr sync_ptr;
2691         volatile struct snd_pcm_mmap_status *status;
2692         volatile struct snd_pcm_mmap_control *control;
2693         int err;
2694
2695         memset(&sync_ptr, 0, sizeof(sync_ptr));
2696         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2697                 return -EFAULT;
2698         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2699                 return -EFAULT;
2700         status = runtime->status;
2701         control = runtime->control;
2702         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2703                 err = snd_pcm_hwsync(substream);
2704                 if (err < 0)
2705                         return err;
2706         }
2707         snd_pcm_stream_lock_irq(substream);
2708         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2709                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2710         else
2711                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2712         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2713                 control->avail_min = sync_ptr.c.control.avail_min;
2714         else
2715                 sync_ptr.c.control.avail_min = control->avail_min;
2716         sync_ptr.s.status.state = status->state;
2717         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2718         sync_ptr.s.status.tstamp = status->tstamp;
2719         sync_ptr.s.status.suspended_state = status->suspended_state;
2720         snd_pcm_stream_unlock_irq(substream);
2721         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2722                 return -EFAULT;
2723         return 0;
2724 }
2725
2726 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2727 {
2728         struct snd_pcm_runtime *runtime = substream->runtime;
2729         int arg;
2730
2731         if (get_user(arg, _arg))
2732                 return -EFAULT;
2733         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2734                 return -EINVAL;
2735         runtime->tstamp_type = arg;
2736         return 0;
2737 }
2738
2739 static int snd_pcm_common_ioctl1(struct file *file,
2740                                  struct snd_pcm_substream *substream,
2741                                  unsigned int cmd, void __user *arg)
2742 {
2743         switch (cmd) {
2744         case SNDRV_PCM_IOCTL_PVERSION:
2745                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2746         case SNDRV_PCM_IOCTL_INFO:
2747                 return snd_pcm_info_user(substream, arg);
2748         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2749                 return 0;
2750         case SNDRV_PCM_IOCTL_TTSTAMP:
2751                 return snd_pcm_tstamp(substream, arg);
2752         case SNDRV_PCM_IOCTL_HW_REFINE:
2753                 return snd_pcm_hw_refine_user(substream, arg);
2754         case SNDRV_PCM_IOCTL_HW_PARAMS:
2755                 return snd_pcm_hw_params_user(substream, arg);
2756         case SNDRV_PCM_IOCTL_HW_FREE:
2757                 return snd_pcm_hw_free(substream);
2758         case SNDRV_PCM_IOCTL_SW_PARAMS:
2759                 return snd_pcm_sw_params_user(substream, arg);
2760         case SNDRV_PCM_IOCTL_STATUS:
2761                 return snd_pcm_status_user(substream, arg, false);
2762         case SNDRV_PCM_IOCTL_STATUS_EXT:
2763                 return snd_pcm_status_user(substream, arg, true);
2764         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2765                 return snd_pcm_channel_info_user(substream, arg);
2766         case SNDRV_PCM_IOCTL_PREPARE:
2767                 return snd_pcm_prepare(substream, file);
2768         case SNDRV_PCM_IOCTL_RESET:
2769                 return snd_pcm_reset(substream);
2770         case SNDRV_PCM_IOCTL_START:
2771                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2772         case SNDRV_PCM_IOCTL_LINK:
2773                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2774         case SNDRV_PCM_IOCTL_UNLINK:
2775                 return snd_pcm_unlink(substream);
2776         case SNDRV_PCM_IOCTL_RESUME:
2777                 return snd_pcm_resume(substream);
2778         case SNDRV_PCM_IOCTL_XRUN:
2779                 return snd_pcm_xrun(substream);
2780         case SNDRV_PCM_IOCTL_HWSYNC:
2781                 return snd_pcm_hwsync(substream);
2782         case SNDRV_PCM_IOCTL_DELAY:
2783                 return snd_pcm_delay(substream, arg);
2784         case SNDRV_PCM_IOCTL_SYNC_PTR:
2785                 return snd_pcm_sync_ptr(substream, arg);
2786 #ifdef CONFIG_SND_SUPPORT_OLD_API
2787         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2788                 return snd_pcm_hw_refine_old_user(substream, arg);
2789         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2790                 return snd_pcm_hw_params_old_user(substream, arg);
2791 #endif
2792         case SNDRV_PCM_IOCTL_DRAIN:
2793                 return snd_pcm_drain(substream, file);
2794         case SNDRV_PCM_IOCTL_DROP:
2795                 return snd_pcm_drop(substream);
2796         case SNDRV_PCM_IOCTL_PAUSE:
2797         {
2798                 int res;
2799                 snd_pcm_stream_lock_irq(substream);
2800                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2801                 snd_pcm_stream_unlock_irq(substream);
2802                 return res;
2803         }
2804         }
2805         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2806         return -ENOTTY;
2807 }
2808
2809 static int snd_pcm_playback_ioctl1(struct file *file,
2810                                    struct snd_pcm_substream *substream,
2811                                    unsigned int cmd, void __user *arg)
2812 {
2813         if (snd_BUG_ON(!substream))
2814                 return -ENXIO;
2815         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2816                 return -EINVAL;
2817         switch (cmd) {
2818         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2819         {
2820                 struct snd_xferi xferi;
2821                 struct snd_xferi __user *_xferi = arg;
2822                 struct snd_pcm_runtime *runtime = substream->runtime;
2823                 snd_pcm_sframes_t result;
2824                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2825                         return -EBADFD;
2826                 if (put_user(0, &_xferi->result))
2827                         return -EFAULT;
2828                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2829                         return -EFAULT;
2830                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2831                 __put_user(result, &_xferi->result);
2832                 return result < 0 ? result : 0;
2833         }
2834         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2835         {
2836                 struct snd_xfern xfern;
2837                 struct snd_xfern __user *_xfern = arg;
2838                 struct snd_pcm_runtime *runtime = substream->runtime;
2839                 void __user **bufs;
2840                 snd_pcm_sframes_t result;
2841                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2842                         return -EBADFD;
2843                 if (runtime->channels > 128)
2844                         return -EINVAL;
2845                 if (put_user(0, &_xfern->result))
2846                         return -EFAULT;
2847                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2848                         return -EFAULT;
2849
2850                 bufs = memdup_user(xfern.bufs,
2851                                    sizeof(void *) * runtime->channels);
2852                 if (IS_ERR(bufs))
2853                         return PTR_ERR(bufs);
2854                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2855                 kfree(bufs);
2856                 __put_user(result, &_xfern->result);
2857                 return result < 0 ? result : 0;
2858         }
2859         case SNDRV_PCM_IOCTL_REWIND:
2860         {
2861                 snd_pcm_uframes_t frames;
2862                 snd_pcm_uframes_t __user *_frames = arg;
2863                 snd_pcm_sframes_t result;
2864                 if (get_user(frames, _frames))
2865                         return -EFAULT;
2866                 if (put_user(0, _frames))
2867                         return -EFAULT;
2868                 result = snd_pcm_playback_rewind(substream, frames);
2869                 __put_user(result, _frames);
2870                 return result < 0 ? result : 0;
2871         }
2872         case SNDRV_PCM_IOCTL_FORWARD:
2873         {
2874                 snd_pcm_uframes_t frames;
2875                 snd_pcm_uframes_t __user *_frames = arg;
2876                 snd_pcm_sframes_t result;
2877                 if (get_user(frames, _frames))
2878                         return -EFAULT;
2879                 if (put_user(0, _frames))
2880                         return -EFAULT;
2881                 result = snd_pcm_playback_forward(substream, frames);
2882                 __put_user(result, _frames);
2883                 return result < 0 ? result : 0;
2884         }
2885         }
2886         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2887 }
2888
2889 static int snd_pcm_capture_ioctl1(struct file *file,
2890                                   struct snd_pcm_substream *substream,
2891                                   unsigned int cmd, void __user *arg)
2892 {
2893         if (snd_BUG_ON(!substream))
2894                 return -ENXIO;
2895         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2896                 return -EINVAL;
2897         switch (cmd) {
2898         case SNDRV_PCM_IOCTL_READI_FRAMES:
2899         {
2900                 struct snd_xferi xferi;
2901                 struct snd_xferi __user *_xferi = arg;
2902                 struct snd_pcm_runtime *runtime = substream->runtime;
2903                 snd_pcm_sframes_t result;
2904                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2905                         return -EBADFD;
2906                 if (put_user(0, &_xferi->result))
2907                         return -EFAULT;
2908                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2909                         return -EFAULT;
2910                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2911                 __put_user(result, &_xferi->result);
2912                 return result < 0 ? result : 0;
2913         }
2914         case SNDRV_PCM_IOCTL_READN_FRAMES:
2915         {
2916                 struct snd_xfern xfern;
2917                 struct snd_xfern __user *_xfern = arg;
2918                 struct snd_pcm_runtime *runtime = substream->runtime;
2919                 void *bufs;
2920                 snd_pcm_sframes_t result;
2921                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2922                         return -EBADFD;
2923                 if (runtime->channels > 128)
2924                         return -EINVAL;
2925                 if (put_user(0, &_xfern->result))
2926                         return -EFAULT;
2927                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2928                         return -EFAULT;
2929
2930                 bufs = memdup_user(xfern.bufs,
2931                                    sizeof(void *) * runtime->channels);
2932                 if (IS_ERR(bufs))
2933                         return PTR_ERR(bufs);
2934                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2935                 kfree(bufs);
2936                 __put_user(result, &_xfern->result);
2937                 return result < 0 ? result : 0;
2938         }
2939         case SNDRV_PCM_IOCTL_REWIND:
2940         {
2941                 snd_pcm_uframes_t frames;
2942                 snd_pcm_uframes_t __user *_frames = arg;
2943                 snd_pcm_sframes_t result;
2944                 if (get_user(frames, _frames))
2945                         return -EFAULT;
2946                 if (put_user(0, _frames))
2947                         return -EFAULT;
2948                 result = snd_pcm_capture_rewind(substream, frames);
2949                 __put_user(result, _frames);
2950                 return result < 0 ? result : 0;
2951         }
2952         case SNDRV_PCM_IOCTL_FORWARD:
2953         {
2954                 snd_pcm_uframes_t frames;
2955                 snd_pcm_uframes_t __user *_frames = arg;
2956                 snd_pcm_sframes_t result;
2957                 if (get_user(frames, _frames))
2958                         return -EFAULT;
2959                 if (put_user(0, _frames))
2960                         return -EFAULT;
2961                 result = snd_pcm_capture_forward(substream, frames);
2962                 __put_user(result, _frames);
2963                 return result < 0 ? result : 0;
2964         }
2965         }
2966         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2967 }
2968
2969 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2970                                    unsigned long arg)
2971 {
2972         struct snd_pcm_file *pcm_file;
2973
2974         pcm_file = file->private_data;
2975
2976         if (((cmd >> 8) & 0xff) != 'A')
2977                 return -ENOTTY;
2978
2979         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2980                                        (void __user *)arg);
2981 }
2982
2983 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2984                                   unsigned long arg)
2985 {
2986         struct snd_pcm_file *pcm_file;
2987
2988         pcm_file = file->private_data;
2989
2990         if (((cmd >> 8) & 0xff) != 'A')
2991                 return -ENOTTY;
2992
2993         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2994                                       (void __user *)arg);
2995 }
2996
2997 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2998                          unsigned int cmd, void *arg)
2999 {
3000         mm_segment_t fs;
3001         int result;
3002
3003         fs = snd_enter_user();
3004         switch (substream->stream) {
3005         case SNDRV_PCM_STREAM_PLAYBACK:
3006                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
3007                                                  (void __user *)arg);
3008                 break;
3009         case SNDRV_PCM_STREAM_CAPTURE:
3010                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
3011                                                 (void __user *)arg);
3012                 break;
3013         default:
3014                 result = -EINVAL;
3015                 break;
3016         }
3017         snd_leave_user(fs);
3018         return result;
3019 }
3020
3021 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3022
3023 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3024                             loff_t * offset)
3025 {
3026         struct snd_pcm_file *pcm_file;
3027         struct snd_pcm_substream *substream;
3028         struct snd_pcm_runtime *runtime;
3029         snd_pcm_sframes_t result;
3030
3031         pcm_file = file->private_data;
3032         substream = pcm_file->substream;
3033         if (PCM_RUNTIME_CHECK(substream))
3034                 return -ENXIO;
3035         runtime = substream->runtime;
3036         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3037                 return -EBADFD;
3038         if (!frame_aligned(runtime, count))
3039                 return -EINVAL;
3040         count = bytes_to_frames(runtime, count);
3041         result = snd_pcm_lib_read(substream, buf, count);
3042         if (result > 0)
3043                 result = frames_to_bytes(runtime, result);
3044         return result;
3045 }
3046
3047 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3048                              size_t count, loff_t * offset)
3049 {
3050         struct snd_pcm_file *pcm_file;
3051         struct snd_pcm_substream *substream;
3052         struct snd_pcm_runtime *runtime;
3053         snd_pcm_sframes_t result;
3054
3055         pcm_file = file->private_data;
3056         substream = pcm_file->substream;
3057         if (PCM_RUNTIME_CHECK(substream))
3058                 return -ENXIO;
3059         runtime = substream->runtime;
3060         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3061                 return -EBADFD;
3062         if (!frame_aligned(runtime, count))
3063                 return -EINVAL;
3064         count = bytes_to_frames(runtime, count);
3065         result = snd_pcm_lib_write(substream, buf, count);
3066         if (result > 0)
3067                 result = frames_to_bytes(runtime, result);
3068         return result;
3069 }
3070
3071 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3072 {
3073         struct snd_pcm_file *pcm_file;
3074         struct snd_pcm_substream *substream;
3075         struct snd_pcm_runtime *runtime;
3076         snd_pcm_sframes_t result;
3077         unsigned long i;
3078         void __user **bufs;
3079         snd_pcm_uframes_t frames;
3080
3081         pcm_file = iocb->ki_filp->private_data;
3082         substream = pcm_file->substream;
3083         if (PCM_RUNTIME_CHECK(substream))
3084                 return -ENXIO;
3085         runtime = substream->runtime;
3086         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3087                 return -EBADFD;
3088         if (!iter_is_iovec(to))
3089                 return -EINVAL;
3090         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3091                 return -EINVAL;
3092         if (!frame_aligned(runtime, to->iov->iov_len))
3093                 return -EINVAL;
3094         frames = bytes_to_samples(runtime, to->iov->iov_len);
3095         bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3096         if (bufs == NULL)
3097                 return -ENOMEM;
3098         for (i = 0; i < to->nr_segs; ++i)
3099                 bufs[i] = to->iov[i].iov_base;
3100         result = snd_pcm_lib_readv(substream, bufs, frames);
3101         if (result > 0)
3102                 result = frames_to_bytes(runtime, result);
3103         kfree(bufs);
3104         return result;
3105 }
3106
3107 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3108 {
3109         struct snd_pcm_file *pcm_file;
3110         struct snd_pcm_substream *substream;
3111         struct snd_pcm_runtime *runtime;
3112         snd_pcm_sframes_t result;
3113         unsigned long i;
3114         void __user **bufs;
3115         snd_pcm_uframes_t frames;
3116
3117         pcm_file = iocb->ki_filp->private_data;
3118         substream = pcm_file->substream;
3119         if (PCM_RUNTIME_CHECK(substream))
3120                 return -ENXIO;
3121         runtime = substream->runtime;
3122         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3123                 return -EBADFD;
3124         if (!iter_is_iovec(from))
3125                 return -EINVAL;
3126         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3127             !frame_aligned(runtime, from->iov->iov_len))
3128                 return -EINVAL;
3129         frames = bytes_to_samples(runtime, from->iov->iov_len);
3130         bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3131         if (bufs == NULL)
3132                 return -ENOMEM;
3133         for (i = 0; i < from->nr_segs; ++i)
3134                 bufs[i] = from->iov[i].iov_base;
3135         result = snd_pcm_lib_writev(substream, bufs, frames);
3136         if (result > 0)
3137                 result = frames_to_bytes(runtime, result);
3138         kfree(bufs);
3139         return result;
3140 }
3141
3142 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3143 {
3144         struct snd_pcm_file *pcm_file;
3145         struct snd_pcm_substream *substream;
3146         struct snd_pcm_runtime *runtime;
3147         unsigned int mask;
3148         snd_pcm_uframes_t avail;
3149
3150         pcm_file = file->private_data;
3151
3152         substream = pcm_file->substream;
3153         if (PCM_RUNTIME_CHECK(substream))
3154                 return -ENXIO;
3155         runtime = substream->runtime;
3156
3157         poll_wait(file, &runtime->sleep, wait);
3158
3159         snd_pcm_stream_lock_irq(substream);
3160         avail = snd_pcm_playback_avail(runtime);
3161         switch (runtime->status->state) {
3162         case SNDRV_PCM_STATE_RUNNING:
3163         case SNDRV_PCM_STATE_PREPARED:
3164         case SNDRV_PCM_STATE_PAUSED:
3165                 if (avail >= runtime->control->avail_min) {
3166                         mask = POLLOUT | POLLWRNORM;
3167                         break;
3168                 }
3169                 /* Fall through */
3170         case SNDRV_PCM_STATE_DRAINING:
3171                 mask = 0;
3172                 break;
3173         default:
3174                 mask = POLLOUT | POLLWRNORM | POLLERR;
3175                 break;
3176         }
3177         snd_pcm_stream_unlock_irq(substream);
3178         return mask;
3179 }
3180
3181 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3182 {
3183         struct snd_pcm_file *pcm_file;
3184         struct snd_pcm_substream *substream;
3185         struct snd_pcm_runtime *runtime;
3186         unsigned int mask;
3187         snd_pcm_uframes_t avail;
3188
3189         pcm_file = file->private_data;
3190
3191         substream = pcm_file->substream;
3192         if (PCM_RUNTIME_CHECK(substream))
3193                 return -ENXIO;
3194         runtime = substream->runtime;
3195
3196         poll_wait(file, &runtime->sleep, wait);
3197
3198         snd_pcm_stream_lock_irq(substream);
3199         avail = snd_pcm_capture_avail(runtime);
3200         switch (runtime->status->state) {
3201         case SNDRV_PCM_STATE_RUNNING:
3202         case SNDRV_PCM_STATE_PREPARED:
3203         case SNDRV_PCM_STATE_PAUSED:
3204                 if (avail >= runtime->control->avail_min) {
3205                         mask = POLLIN | POLLRDNORM;
3206                         break;
3207                 }
3208                 mask = 0;
3209                 break;
3210         case SNDRV_PCM_STATE_DRAINING:
3211                 if (avail > 0) {
3212                         mask = POLLIN | POLLRDNORM;
3213                         break;
3214                 }
3215                 /* Fall through */
3216         default:
3217                 mask = POLLIN | POLLRDNORM | POLLERR;
3218                 break;
3219         }
3220         snd_pcm_stream_unlock_irq(substream);
3221         return mask;
3222 }
3223
3224 /*
3225  * mmap support
3226  */
3227
3228 /*
3229  * Only on coherent architectures, we can mmap the status and the control records
3230  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3231  */
3232 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3233 /*
3234  * mmap status record
3235  */
3236 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3237                                                 struct vm_fault *vmf)
3238 {
3239         struct snd_pcm_substream *substream = area->vm_private_data;
3240         struct snd_pcm_runtime *runtime;
3241
3242         if (substream == NULL)
3243                 return VM_FAULT_SIGBUS;
3244         runtime = substream->runtime;
3245         vmf->page = virt_to_page(runtime->status);
3246         get_page(vmf->page);
3247         return 0;
3248 }
3249
3250 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3251 {
3252         .fault =        snd_pcm_mmap_status_fault,
3253 };
3254
3255 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3256                                struct vm_area_struct *area)
3257 {
3258         long size;
3259         if (!(area->vm_flags & VM_READ))
3260                 return -EINVAL;
3261         size = area->vm_end - area->vm_start;
3262         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3263                 return -EINVAL;
3264         area->vm_ops = &snd_pcm_vm_ops_status;
3265         area->vm_private_data = substream;
3266         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3267         return 0;
3268 }
3269
3270 /*
3271  * mmap control record
3272  */
3273 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3274                                                 struct vm_fault *vmf)
3275 {
3276         struct snd_pcm_substream *substream = area->vm_private_data;
3277         struct snd_pcm_runtime *runtime;
3278
3279         if (substream == NULL)
3280                 return VM_FAULT_SIGBUS;
3281         runtime = substream->runtime;
3282         vmf->page = virt_to_page(runtime->control);
3283         get_page(vmf->page);
3284         return 0;
3285 }
3286
3287 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3288 {
3289         .fault =        snd_pcm_mmap_control_fault,
3290 };
3291
3292 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3293                                 struct vm_area_struct *area)
3294 {
3295         long size;
3296         if (!(area->vm_flags & VM_READ))
3297                 return -EINVAL;
3298         size = area->vm_end - area->vm_start;
3299         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3300                 return -EINVAL;
3301         area->vm_ops = &snd_pcm_vm_ops_control;
3302         area->vm_private_data = substream;
3303         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3304         return 0;
3305 }
3306 #else /* ! coherent mmap */
3307 /*
3308  * don't support mmap for status and control records.
3309  */
3310 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3311                                struct vm_area_struct *area)
3312 {
3313         return -ENXIO;
3314 }
3315 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3316                                 struct vm_area_struct *area)
3317 {
3318         return -ENXIO;
3319 }
3320 #endif /* coherent mmap */
3321
3322 static inline struct page *
3323 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3324 {
3325         void *vaddr = substream->runtime->dma_area + ofs;
3326         return virt_to_page(vaddr);
3327 }
3328
3329 /*
3330  * fault callback for mmapping a RAM page
3331  */
3332 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3333                                                 struct vm_fault *vmf)
3334 {
3335         struct snd_pcm_substream *substream = area->vm_private_data;
3336         struct snd_pcm_runtime *runtime;
3337         unsigned long offset;
3338         struct page * page;
3339         size_t dma_bytes;
3340
3341         if (substream == NULL)
3342                 return VM_FAULT_SIGBUS;
3343         runtime = substream->runtime;
3344         offset = vmf->pgoff << PAGE_SHIFT;
3345         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3346         if (offset > dma_bytes - PAGE_SIZE)
3347                 return VM_FAULT_SIGBUS;
3348         if (substream->ops->page)
3349                 page = substream->ops->page(substream, offset);
3350         else
3351                 page = snd_pcm_default_page_ops(substream, offset);
3352         if (!page)
3353                 return VM_FAULT_SIGBUS;
3354         get_page(page);
3355         vmf->page = page;
3356         return 0;
3357 }
3358
3359 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3360         .open =         snd_pcm_mmap_data_open,
3361         .close =        snd_pcm_mmap_data_close,
3362 };
3363
3364 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3365         .open =         snd_pcm_mmap_data_open,
3366         .close =        snd_pcm_mmap_data_close,
3367         .fault =        snd_pcm_mmap_data_fault,
3368 };
3369
3370 /*
3371  * mmap the DMA buffer on RAM
3372  */
3373
3374 /**
3375  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3376  * @substream: PCM substream
3377  * @area: VMA
3378  *
3379  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3380  * this function is invoked implicitly.
3381  */
3382 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3383                              struct vm_area_struct *area)
3384 {
3385         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3386 #ifdef CONFIG_GENERIC_ALLOCATOR
3387         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3388                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3389                 return remap_pfn_range(area, area->vm_start,
3390                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3391                                 area->vm_end - area->vm_start, area->vm_page_prot);
3392         }
3393 #endif /* CONFIG_GENERIC_ALLOCATOR */
3394 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3395         if (!substream->ops->page &&
3396             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3397                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3398                                          area,
3399                                          substream->runtime->dma_area,
3400                                          substream->runtime->dma_addr,
3401                                          area->vm_end - area->vm_start);
3402 #endif /* CONFIG_X86 */
3403         /* mmap with fault handler */
3404         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3405         return 0;
3406 }
3407 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3408
3409 /*
3410  * mmap the DMA buffer on I/O memory area
3411  */
3412 #if SNDRV_PCM_INFO_MMAP_IOMEM
3413 /**
3414  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3415  * @substream: PCM substream
3416  * @area: VMA
3417  *
3418  * When your hardware uses the iomapped pages as the hardware buffer and
3419  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3420  * is supposed to work only on limited architectures.
3421  */
3422 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3423                            struct vm_area_struct *area)
3424 {
3425         struct snd_pcm_runtime *runtime = substream->runtime;;
3426
3427         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3428         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3429 }
3430
3431 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3432 #endif /* SNDRV_PCM_INFO_MMAP */
3433
3434 /*
3435  * mmap DMA buffer
3436  */
3437 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3438                       struct vm_area_struct *area)
3439 {
3440         struct snd_pcm_runtime *runtime;
3441         long size;
3442         unsigned long offset;
3443         size_t dma_bytes;
3444         int err;
3445
3446         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3447                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3448                         return -EINVAL;
3449         } else {
3450                 if (!(area->vm_flags & VM_READ))
3451                         return -EINVAL;
3452         }
3453         runtime = substream->runtime;
3454         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3455                 return -EBADFD;
3456         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3457                 return -ENXIO;
3458         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3459             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3460                 return -EINVAL;
3461         size = area->vm_end - area->vm_start;
3462         offset = area->vm_pgoff << PAGE_SHIFT;
3463         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3464         if ((size_t)size > dma_bytes)
3465                 return -EINVAL;
3466         if (offset > dma_bytes - size)
3467                 return -EINVAL;
3468
3469         area->vm_ops = &snd_pcm_vm_ops_data;
3470         area->vm_private_data = substream;
3471         if (substream->ops->mmap)
3472                 err = substream->ops->mmap(substream, area);
3473         else
3474                 err = snd_pcm_lib_default_mmap(substream, area);
3475         if (!err)
3476                 atomic_inc(&substream->mmap_count);
3477         return err;
3478 }
3479
3480 EXPORT_SYMBOL(snd_pcm_mmap_data);
3481
3482 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3483 {
3484         struct snd_pcm_file * pcm_file;
3485         struct snd_pcm_substream *substream;
3486         unsigned long offset;
3487
3488         pcm_file = file->private_data;
3489         substream = pcm_file->substream;
3490         if (PCM_RUNTIME_CHECK(substream))
3491                 return -ENXIO;
3492
3493         offset = area->vm_pgoff << PAGE_SHIFT;
3494         switch (offset) {
3495         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3496                 if (pcm_file->no_compat_mmap)
3497                         return -ENXIO;
3498                 return snd_pcm_mmap_status(substream, file, area);
3499         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3500                 if (pcm_file->no_compat_mmap)
3501                         return -ENXIO;
3502                 return snd_pcm_mmap_control(substream, file, area);
3503         default:
3504                 return snd_pcm_mmap_data(substream, file, area);
3505         }
3506         return 0;
3507 }
3508
3509 static int snd_pcm_fasync(int fd, struct file * file, int on)
3510 {
3511         struct snd_pcm_file * pcm_file;
3512         struct snd_pcm_substream *substream;
3513         struct snd_pcm_runtime *runtime;
3514
3515         pcm_file = file->private_data;
3516         substream = pcm_file->substream;
3517         if (PCM_RUNTIME_CHECK(substream))
3518                 return -ENXIO;
3519         runtime = substream->runtime;
3520         return fasync_helper(fd, file, on, &runtime->fasync);
3521 }
3522
3523 /*
3524  * ioctl32 compat
3525  */
3526 #ifdef CONFIG_COMPAT
3527 #include "pcm_compat.c"
3528 #else
3529 #define snd_pcm_ioctl_compat    NULL
3530 #endif
3531
3532 /*
3533  *  To be removed helpers to keep binary compatibility
3534  */
3535
3536 #ifdef CONFIG_SND_SUPPORT_OLD_API
3537 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3538 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3539
3540 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3541                                                struct snd_pcm_hw_params_old *oparams)
3542 {
3543         unsigned int i;
3544
3545         memset(params, 0, sizeof(*params));
3546         params->flags = oparams->flags;
3547         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3548                 params->masks[i].bits[0] = oparams->masks[i];
3549         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3550         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3551         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3552         params->info = oparams->info;
3553         params->msbits = oparams->msbits;
3554         params->rate_num = oparams->rate_num;
3555         params->rate_den = oparams->rate_den;
3556         params->fifo_size = oparams->fifo_size;
3557 }
3558
3559 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3560                                              struct snd_pcm_hw_params *params)
3561 {
3562         unsigned int i;
3563
3564         memset(oparams, 0, sizeof(*oparams));
3565         oparams->flags = params->flags;
3566         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3567                 oparams->masks[i] = params->masks[i].bits[0];
3568         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3569         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3570         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3571         oparams->info = params->info;
3572         oparams->msbits = params->msbits;
3573         oparams->rate_num = params->rate_num;
3574         oparams->rate_den = params->rate_den;
3575         oparams->fifo_size = params->fifo_size;
3576 }
3577
3578 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3579                                       struct snd_pcm_hw_params_old __user * _oparams)
3580 {
3581         struct snd_pcm_hw_params *params;
3582         struct snd_pcm_hw_params_old *oparams = NULL;
3583         int err;
3584
3585         params = kmalloc(sizeof(*params), GFP_KERNEL);
3586         if (!params)
3587                 return -ENOMEM;
3588
3589         oparams = memdup_user(_oparams, sizeof(*oparams));
3590         if (IS_ERR(oparams)) {
3591                 err = PTR_ERR(oparams);
3592                 goto out;
3593         }
3594         snd_pcm_hw_convert_from_old_params(params, oparams);
3595         err = snd_pcm_hw_refine(substream, params);
3596         snd_pcm_hw_convert_to_old_params(oparams, params);
3597         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3598                 if (!err)
3599                         err = -EFAULT;
3600         }
3601
3602         kfree(oparams);
3603 out:
3604         kfree(params);
3605         return err;
3606 }
3607
3608 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3609                                       struct snd_pcm_hw_params_old __user * _oparams)
3610 {
3611         struct snd_pcm_hw_params *params;
3612         struct snd_pcm_hw_params_old *oparams = NULL;
3613         int err;
3614
3615         params = kmalloc(sizeof(*params), GFP_KERNEL);
3616         if (!params)
3617                 return -ENOMEM;
3618
3619         oparams = memdup_user(_oparams, sizeof(*oparams));
3620         if (IS_ERR(oparams)) {
3621                 err = PTR_ERR(oparams);
3622                 goto out;
3623         }
3624         snd_pcm_hw_convert_from_old_params(params, oparams);
3625         err = snd_pcm_hw_params(substream, params);
3626         snd_pcm_hw_convert_to_old_params(oparams, params);
3627         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3628                 if (!err)
3629                         err = -EFAULT;
3630         }
3631
3632         kfree(oparams);
3633 out:
3634         kfree(params);
3635         return err;
3636 }
3637 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3638
3639 #ifndef CONFIG_MMU
3640 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3641                                                unsigned long addr,
3642                                                unsigned long len,
3643                                                unsigned long pgoff,
3644                                                unsigned long flags)
3645 {
3646         struct snd_pcm_file *pcm_file = file->private_data;
3647         struct snd_pcm_substream *substream = pcm_file->substream;
3648         struct snd_pcm_runtime *runtime = substream->runtime;
3649         unsigned long offset = pgoff << PAGE_SHIFT;
3650
3651         switch (offset) {
3652         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3653                 return (unsigned long)runtime->status;
3654         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3655                 return (unsigned long)runtime->control;
3656         default:
3657                 return (unsigned long)runtime->dma_area + offset;
3658         }
3659 }
3660 #else
3661 # define snd_pcm_get_unmapped_area NULL
3662 #endif
3663
3664 /*
3665  *  Register section
3666  */
3667
3668 const struct file_operations snd_pcm_f_ops[2] = {
3669         {
3670                 .owner =                THIS_MODULE,
3671                 .write =                snd_pcm_write,
3672                 .write_iter =           snd_pcm_writev,
3673                 .open =                 snd_pcm_playback_open,
3674                 .release =              snd_pcm_release,
3675                 .llseek =               no_llseek,
3676                 .poll =                 snd_pcm_playback_poll,
3677                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3678                 .compat_ioctl =         snd_pcm_ioctl_compat,
3679                 .mmap =                 snd_pcm_mmap,
3680                 .fasync =               snd_pcm_fasync,
3681                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3682         },
3683         {
3684                 .owner =                THIS_MODULE,
3685                 .read =                 snd_pcm_read,
3686                 .read_iter =            snd_pcm_readv,
3687                 .open =                 snd_pcm_capture_open,
3688                 .release =              snd_pcm_release,
3689                 .llseek =               no_llseek,
3690                 .poll =                 snd_pcm_capture_poll,
3691                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3692                 .compat_ioctl =         snd_pcm_ioctl_compat,
3693                 .mmap =                 snd_pcm_mmap,
3694                 .fasync =               snd_pcm_fasync,
3695                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3696         }
3697 };