sound/core/pcm_native.c

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