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