SAFE public projects git trees. - safe/jmp/linux-2.6/blob - sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <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         snd_pcm_gettime(runtime, &status->tstamp);
 599         status->appl_ptr = runtime->control->appl_ptr;
 600         status->hw_ptr = runtime->status->hw_ptr;
 601         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 602                 status->avail = snd_pcm_playback_avail(runtime);
 603                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 604                     runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 605                         status->delay = runtime->buffer_size - status->avail;
 606                 else
 607                         status->delay = 0;
 608         } else {
 609                 status->avail = snd_pcm_capture_avail(runtime);
 610                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 611                         status->delay = status->avail;
 612                 else
 613                         status->delay = 0;
 614         }
 615         status->avail_max = runtime->avail_max;
 616         status->overrange = runtime->overrange;
 617         runtime->avail_max = 0;
 618         runtime->overrange = 0;
 619  _end:
 620         snd_pcm_stream_unlock_irq(substream);
 621         return 0;
 622 }
 623
 624 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 625                                struct snd_pcm_status __user * _status)
 626 {
 627         struct snd_pcm_status status;
 628         struct snd_pcm_runtime *runtime;
 629         int res;
 630
 631         snd_assert(substream != NULL, return -ENXIO);
 632         runtime = substream->runtime;
 633         memset(&status, 0, sizeof(status));
 634         res = snd_pcm_status(substream, &status);
 635         if (res < 0)
 636                 return res;
 637         if (copy_to_user(_status, &status, sizeof(status)))
 638                 return -EFAULT;
 639         return 0;
 640 }
 641
 642 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 643                                 struct snd_pcm_channel_info * info)
 644 {
 645         struct snd_pcm_runtime *runtime;
 646         unsigned int channel;
 647
 648         snd_assert(substream != NULL, return -ENXIO);
 649         channel = info->channel;
 650         runtime = substream->runtime;
 651         snd_pcm_stream_lock_irq(substream);
 652         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 653                 snd_pcm_stream_unlock_irq(substream);
 654                 return -EBADFD;
 655         }
 656         snd_pcm_stream_unlock_irq(substream);
 657         if (channel >= runtime->channels)
 658                 return -EINVAL;
 659         memset(info, 0, sizeof(*info));
 660         info->channel = channel;
 661         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 662 }
 663
 664 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 665                                      struct snd_pcm_channel_info __user * _info)
 666 {
 667         struct snd_pcm_channel_info info;
 668         int res;
 669
 670         if (copy_from_user(&info, _info, sizeof(info)))
 671                 return -EFAULT;
 672         res = snd_pcm_channel_info(substream, &info);
 673         if (res < 0)
 674                 return res;
 675         if (copy_to_user(_info, &info, sizeof(info)))
 676                 return -EFAULT;
 677         return 0;
 678 }
 679
 680 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 681 {
 682         struct snd_pcm_runtime *runtime = substream->runtime;
 683         if (runtime->trigger_master == NULL)
 684                 return;
 685         if (runtime->trigger_master == substream) {
 686                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 687         } else {
 688                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 689                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 690         }
 691         runtime->trigger_master = NULL;
 692 }
 693
 694 struct action_ops {
 695         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 696         int (*do_action)(struct snd_pcm_substream *substream, int state);
 697         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 698         void (*post_action)(struct snd_pcm_substream *substream, int state);
 699 };
 700
 701 /*
 702  *  this functions is core for handling of linked stream
 703  *  Note: the stream state might be changed also on failure
 704  *  Note2: call with calling stream lock + link lock
 705  */
 706 static int snd_pcm_action_group(struct action_ops *ops,
 707                                 struct snd_pcm_substream *substream,
 708                                 int state, int do_lock)
 709 {
 710         struct snd_pcm_substream *s = NULL;
 711         struct snd_pcm_substream *s1;
 712         int res = 0;
 713
 714         snd_pcm_group_for_each_entry(s, substream) {
 715                 if (do_lock && s != substream)
 716                         spin_lock_nested(&s->self_group.lock,
 717                                          SINGLE_DEPTH_NESTING);
 718                 res = ops->pre_action(s, state);
 719                 if (res < 0)
 720                         goto _unlock;
 721         }
 722         snd_pcm_group_for_each_entry(s, substream) {
 723                 res = ops->do_action(s, state);
 724                 if (res < 0) {
 725                         if (ops->undo_action) {
 726                                 snd_pcm_group_for_each_entry(s1, substream) {
 727                                         if (s1 == s) /* failed stream */
 728                                                 break;
 729                                         ops->undo_action(s1, state);
 730                                 }
 731                         }
 732                         s = NULL; /* unlock all */
 733                         goto _unlock;
 734                 }
 735         }
 736         snd_pcm_group_for_each_entry(s, substream) {
 737                 ops->post_action(s, state);
 738         }
 739  _unlock:
 740         if (do_lock) {
 741                 /* unlock streams */
 742                 snd_pcm_group_for_each_entry(s1, substream) {
 743                         if (s1 != substream)
 744                                 spin_unlock(&s1->self_group.lock);
 745                         if (s1 == s)    /* end */
 746                                 break;
 747                 }
 748         }
 749         return res;
 750 }
 751
 752 /*
 753  *  Note: call with stream lock
 754  */
 755 static int snd_pcm_action_single(struct action_ops *ops,
 756                                  struct snd_pcm_substream *substream,
 757                                  int state)
 758 {
 759         int res;
 760
 761         res = ops->pre_action(substream, state);
 762         if (res < 0)
 763                 return res;
 764         res = ops->do_action(substream, state);
 765         if (res == 0)
 766                 ops->post_action(substream, state);
 767         else if (ops->undo_action)
 768                 ops->undo_action(substream, state);
 769         return res;
 770 }
 771
 772 /*
 773  *  Note: call with stream lock
 774  */
 775 static int snd_pcm_action(struct action_ops *ops,
 776                           struct snd_pcm_substream *substream,
 777                           int state)
 778 {
 779         int res;
 780
 781         if (snd_pcm_stream_linked(substream)) {
 782                 if (!spin_trylock(&substream->group->lock)) {
 783                         spin_unlock(&substream->self_group.lock);
 784                         spin_lock(&substream->group->lock);
 785                         spin_lock(&substream->self_group.lock);
 786                 }
 787                 res = snd_pcm_action_group(ops, substream, state, 1);
 788                 spin_unlock(&substream->group->lock);
 789         } else {
 790                 res = snd_pcm_action_single(ops, substream, state);
 791         }
 792         return res;
 793 }
 794
 795 /*
 796  *  Note: don't use any locks before
 797  */
 798 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 799                                    struct snd_pcm_substream *substream,
 800                                    int state)
 801 {
 802         int res;
 803
 804         read_lock_irq(&snd_pcm_link_rwlock);
 805         if (snd_pcm_stream_linked(substream)) {
 806                 spin_lock(&substream->group->lock);
 807                 spin_lock(&substream->self_group.lock);
 808                 res = snd_pcm_action_group(ops, substream, state, 1);
 809                 spin_unlock(&substream->self_group.lock);
 810                 spin_unlock(&substream->group->lock);
 811         } else {
 812                 spin_lock(&substream->self_group.lock);
 813                 res = snd_pcm_action_single(ops, substream, state);
 814                 spin_unlock(&substream->self_group.lock);
 815         }
 816         read_unlock_irq(&snd_pcm_link_rwlock);
 817         return res;
 818 }
 819
 820 /*
 821  */
 822 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 823                                     struct snd_pcm_substream *substream,
 824                                     int state)
 825 {
 826         int res;
 827
 828         down_read(&snd_pcm_link_rwsem);
 829         if (snd_pcm_stream_linked(substream))
 830                 res = snd_pcm_action_group(ops, substream, state, 0);
 831         else
 832                 res = snd_pcm_action_single(ops, substream, state);
 833         up_read(&snd_pcm_link_rwsem);
 834         return res;
 835 }
 836
 837 /*
 838  * start callbacks
 839  */
 840 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 841 {
 842         struct snd_pcm_runtime *runtime = substream->runtime;
 843         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 844                 return -EBADFD;
 845         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 846             !snd_pcm_playback_data(substream))
 847                 return -EPIPE;
 848         runtime->trigger_master = substream;
 849         return 0;
 850 }
 851
 852 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 853 {
 854         if (substream->runtime->trigger_master != substream)
 855                 return 0;
 856         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 857 }
 858
 859 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 860 {
 861         if (substream->runtime->trigger_master == substream)
 862                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 863 }
 864
 865 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 866 {
 867         struct snd_pcm_runtime *runtime = substream->runtime;
 868         snd_pcm_trigger_tstamp(substream);
 869         runtime->status->state = state;
 870         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 871             runtime->silence_size > 0)
 872                 snd_pcm_playback_silence(substream, ULONG_MAX);
 873         if (runtime->sleep_min)
 874                 snd_pcm_tick_prepare(substream);
 875         if (substream->timer)
 876                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 877                                  &runtime->trigger_tstamp);
 878 }
 879
 880 static struct action_ops snd_pcm_action_start = {
 881         .pre_action = snd_pcm_pre_start,
 882         .do_action = snd_pcm_do_start,
 883         .undo_action = snd_pcm_undo_start,
 884         .post_action = snd_pcm_post_start
 885 };
 886
 887 /**
 888  * snd_pcm_start
 889  * @substream: the PCM substream instance
 890  *
 891  * Start all linked streams.
 892  */
 893 int snd_pcm_start(struct snd_pcm_substream *substream)
 894 {
 895         return snd_pcm_action(&snd_pcm_action_start, substream,
 896                               SNDRV_PCM_STATE_RUNNING);
 897 }
 898
 899 /*
 900  * stop callbacks
 901  */
 902 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 903 {
 904         struct snd_pcm_runtime *runtime = substream->runtime;
 905         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 906                 return -EBADFD;
 907         runtime->trigger_master = substream;
 908         return 0;
 909 }
 910
 911 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 912 {
 913         if (substream->runtime->trigger_master == substream &&
 914             snd_pcm_running(substream))
 915                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 916         return 0; /* unconditonally stop all substreams */
 917 }
 918
 919 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 920 {
 921         struct snd_pcm_runtime *runtime = substream->runtime;
 922         if (runtime->status->state != state) {
 923                 snd_pcm_trigger_tstamp(substream);
 924                 if (substream->timer)
 925                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 926                                          &runtime->trigger_tstamp);
 927                 runtime->status->state = state;
 928                 snd_pcm_tick_set(substream, 0);
 929         }
 930         wake_up(&runtime->sleep);
 931 }
 932
 933 static struct action_ops snd_pcm_action_stop = {
 934         .pre_action = snd_pcm_pre_stop,
 935         .do_action = snd_pcm_do_stop,
 936         .post_action = snd_pcm_post_stop
 937 };
 938
 939 /**
 940  * snd_pcm_stop
 941  * @substream: the PCM substream instance
 942  * @state: PCM state after stopping the stream
 943  *
 944  * Try to stop all running streams in the substream group.
 945  * The state of each stream is changed to the given value after that unconditionally.
 946  */
 947 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 948 {
 949         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 950 }
 951
 952 EXPORT_SYMBOL(snd_pcm_stop);
 953
 954 /**
 955  * snd_pcm_drain_done
 956  * @substream: the PCM substream
 957  *
 958  * Stop the DMA only when the given stream is playback.
 959  * The state is changed to SETUP.
 960  * Unlike snd_pcm_stop(), this affects only the given stream.
 961  */
 962 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 963 {
 964         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 965                                      SNDRV_PCM_STATE_SETUP);
 966 }
 967
 968 /*
 969  * pause callbacks
 970  */
 971 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 972 {
 973         struct snd_pcm_runtime *runtime = substream->runtime;
 974         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 975                 return -ENOSYS;
 976         if (push) {
 977                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 978                         return -EBADFD;
 979         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 980                 return -EBADFD;
 981         runtime->trigger_master = substream;
 982         return 0;
 983 }
 984
 985 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 986 {
 987         if (substream->runtime->trigger_master != substream)
 988                 return 0;
 989         return substream->ops->trigger(substream,
 990                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 991                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 992 }
 993
 994 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 995 {
 996         if (substream->runtime->trigger_master == substream)
 997                 substream->ops->trigger(substream,
 998                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
 999                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1000 }
1001
1002 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1003 {
1004         struct snd_pcm_runtime *runtime = substream->runtime;
1005         snd_pcm_trigger_tstamp(substream);
1006         if (push) {
1007                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1008                 if (substream->timer)
1009                         snd_timer_notify(substream->timer,
1010                                          SNDRV_TIMER_EVENT_MPAUSE,
1011                                          &runtime->trigger_tstamp);
1012                 snd_pcm_tick_set(substream, 0);
1013                 wake_up(&runtime->sleep);
1014         } else {
1015                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1016                 if (runtime->sleep_min)
1017                         snd_pcm_tick_prepare(substream);
1018                 if (substream->timer)
1019                         snd_timer_notify(substream->timer,
1020                                          SNDRV_TIMER_EVENT_MCONTINUE,
1021                                          &runtime->trigger_tstamp);
1022         }
1023 }
1024
1025 static struct action_ops snd_pcm_action_pause = {
1026         .pre_action = snd_pcm_pre_pause,
1027         .do_action = snd_pcm_do_pause,
1028         .undo_action = snd_pcm_undo_pause,
1029         .post_action = snd_pcm_post_pause
1030 };
1031
1032 /*
1033  * Push/release the pause for all linked streams.
1034  */
1035 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1036 {
1037         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1038 }
1039
1040 #ifdef CONFIG_PM
1041 /* suspend */
1042
1043 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1044 {
1045         struct snd_pcm_runtime *runtime = substream->runtime;
1046         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1047                 return -EBUSY;
1048         runtime->trigger_master = substream;
1049         return 0;
1050 }
1051
1052 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1053 {
1054         struct snd_pcm_runtime *runtime = substream->runtime;
1055         if (runtime->trigger_master != substream)
1056                 return 0;
1057         if (! snd_pcm_running(substream))
1058                 return 0;
1059         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1060         return 0; /* suspend unconditionally */
1061 }
1062
1063 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1064 {
1065         struct snd_pcm_runtime *runtime = substream->runtime;
1066         snd_pcm_trigger_tstamp(substream);
1067         if (substream->timer)
1068                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1069                                  &runtime->trigger_tstamp);
1070         runtime->status->suspended_state = runtime->status->state;
1071         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1072         snd_pcm_tick_set(substream, 0);
1073         wake_up(&runtime->sleep);
1074 }
1075
1076 static struct action_ops snd_pcm_action_suspend = {
1077         .pre_action = snd_pcm_pre_suspend,
1078         .do_action = snd_pcm_do_suspend,
1079         .post_action = snd_pcm_post_suspend
1080 };
1081
1082 /**
1083  * snd_pcm_suspend
1084  * @substream: the PCM substream
1085  *
1086  * Trigger SUSPEND to all linked streams.
1087  * After this call, all streams are changed to SUSPENDED state.
1088  */
1089 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1090 {
1091         int err;
1092         unsigned long flags;
1093
1094         if (! substream)
1095                 return 0;
1096
1097         snd_pcm_stream_lock_irqsave(substream, flags);
1098         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1099         snd_pcm_stream_unlock_irqrestore(substream, flags);
1100         return err;
1101 }
1102
1103 EXPORT_SYMBOL(snd_pcm_suspend);
1104
1105 /**
1106  * snd_pcm_suspend_all
1107  * @pcm: the PCM instance
1108  *
1109  * Trigger SUSPEND to all substreams in the given pcm.
1110  * After this call, all streams are changed to SUSPENDED state.
1111  */
1112 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1113 {
1114         struct snd_pcm_substream *substream;
1115         int stream, err = 0;
1116
1117         if (! pcm)
1118                 return 0;
1119
1120         for (stream = 0; stream < 2; stream++) {
1121                 for (substream = pcm->streams[stream].substream;
1122                      substream; substream = substream->next) {
1123                         /* FIXME: the open/close code should lock this as well */
1124                         if (substream->runtime == NULL)
1125                                 continue;
1126                         err = snd_pcm_suspend(substream);
1127                         if (err < 0 && err != -EBUSY)
1128                                 return err;
1129                 }
1130         }
1131         return 0;
1132 }
1133
1134 EXPORT_SYMBOL(snd_pcm_suspend_all);
1135
1136 /* resume */
1137
1138 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1139 {
1140         struct snd_pcm_runtime *runtime = substream->runtime;
1141         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1142                 return -ENOSYS;
1143         runtime->trigger_master = substream;
1144         return 0;
1145 }
1146
1147 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1148 {
1149         struct snd_pcm_runtime *runtime = substream->runtime;
1150         if (runtime->trigger_master != substream)
1151                 return 0;
1152         /* DMA not running previously? */
1153         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1154             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1155              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1156                 return 0;
1157         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1158 }
1159
1160 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1161 {
1162         if (substream->runtime->trigger_master == substream &&
1163             snd_pcm_running(substream))
1164                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1165 }
1166
1167 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1168 {
1169         struct snd_pcm_runtime *runtime = substream->runtime;
1170         snd_pcm_trigger_tstamp(substream);
1171         if (substream->timer)
1172                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1173                                  &runtime->trigger_tstamp);
1174         runtime->status->state = runtime->status->suspended_state;
1175         if (runtime->sleep_min)
1176                 snd_pcm_tick_prepare(substream);
1177 }
1178
1179 static struct action_ops snd_pcm_action_resume = {
1180         .pre_action = snd_pcm_pre_resume,
1181         .do_action = snd_pcm_do_resume,
1182         .undo_action = snd_pcm_undo_resume,
1183         .post_action = snd_pcm_post_resume
1184 };
1185
1186 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1187 {
1188         struct snd_card *card = substream->pcm->card;
1189         int res;
1190
1191         snd_power_lock(card);
1192         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1193                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1194         snd_power_unlock(card);
1195         return res;
1196 }
1197
1198 #else
1199
1200 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1201 {
1202         return -ENOSYS;
1203 }
1204
1205 #endif /* CONFIG_PM */
1206
1207 /*
1208  * xrun ioctl
1209  *
1210  * Change the RUNNING stream(s) to XRUN state.
1211  */
1212 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1213 {
1214         struct snd_card *card = substream->pcm->card;
1215         struct snd_pcm_runtime *runtime = substream->runtime;
1216         int result;
1217
1218         snd_power_lock(card);
1219         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1220                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1221                 if (result < 0)
1222                         goto _unlock;
1223         }
1224
1225         snd_pcm_stream_lock_irq(substream);
1226         switch (runtime->status->state) {
1227         case SNDRV_PCM_STATE_XRUN:
1228                 result = 0;     /* already there */
1229                 break;
1230         case SNDRV_PCM_STATE_RUNNING:
1231                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1232                 break;
1233         default:
1234                 result = -EBADFD;
1235         }
1236         snd_pcm_stream_unlock_irq(substream);
1237  _unlock:
1238         snd_power_unlock(card);
1239         return result;
1240 }
1241
1242 /*
1243  * reset ioctl
1244  */
1245 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1246 {
1247         struct snd_pcm_runtime *runtime = substream->runtime;
1248         switch (runtime->status->state) {
1249         case SNDRV_PCM_STATE_RUNNING:
1250         case SNDRV_PCM_STATE_PREPARED:
1251         case SNDRV_PCM_STATE_PAUSED:
1252         case SNDRV_PCM_STATE_SUSPENDED:
1253                 return 0;
1254         default:
1255                 return -EBADFD;
1256         }
1257 }
1258
1259 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1260 {
1261         struct snd_pcm_runtime *runtime = substream->runtime;
1262         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1263         if (err < 0)
1264                 return err;
1265         // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1266         runtime->hw_ptr_base = 0;
1267         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1268                 runtime->status->hw_ptr % runtime->period_size;
1269         runtime->silence_start = runtime->status->hw_ptr;
1270         runtime->silence_filled = 0;
1271         return 0;
1272 }
1273
1274 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1275 {
1276         struct snd_pcm_runtime *runtime = substream->runtime;
1277         runtime->control->appl_ptr = runtime->status->hw_ptr;
1278         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1279             runtime->silence_size > 0)
1280                 snd_pcm_playback_silence(substream, ULONG_MAX);
1281 }
1282
1283 static struct action_ops snd_pcm_action_reset = {
1284         .pre_action = snd_pcm_pre_reset,
1285         .do_action = snd_pcm_do_reset,
1286         .post_action = snd_pcm_post_reset
1287 };
1288
1289 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1290 {
1291         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1292 }
1293
1294 /*
1295  * prepare ioctl
1296  */
1297 /* we use the second argument for updating f_flags */
1298 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1299                                int f_flags)
1300 {
1301         struct snd_pcm_runtime *runtime = substream->runtime;
1302         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1303             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1304                 return -EBADFD;
1305         if (snd_pcm_running(substream))
1306                 return -EBUSY;
1307         substream->f_flags = f_flags;
1308         return 0;
1309 }
1310
1311 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1312 {
1313         int err;
1314         err = substream->ops->prepare(substream);
1315         if (err < 0)
1316                 return err;
1317         return snd_pcm_do_reset(substream, 0);
1318 }
1319
1320 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1321 {
1322         struct snd_pcm_runtime *runtime = substream->runtime;
1323         runtime->control->appl_ptr = runtime->status->hw_ptr;
1324         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1325 }
1326
1327 static struct action_ops snd_pcm_action_prepare = {
1328         .pre_action = snd_pcm_pre_prepare,
1329         .do_action = snd_pcm_do_prepare,
1330         .post_action = snd_pcm_post_prepare
1331 };
1332
1333 /**
1334  * snd_pcm_prepare
1335  * @substream: the PCM substream instance
1336  * @file: file to refer f_flags
1337  *
1338  * Prepare the PCM substream to be triggerable.
1339  */
1340 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1341                            struct file *file)
1342 {
1343         int res;
1344         struct snd_card *card = substream->pcm->card;
1345         int f_flags;
1346
1347         if (file)
1348                 f_flags = file->f_flags;
1349         else
1350                 f_flags = substream->f_flags;
1351
1352         snd_power_lock(card);
1353         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1354                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1355                                                substream, f_flags);
1356         snd_power_unlock(card);
1357         return res;
1358 }
1359
1360 /*
1361  * drain ioctl
1362  */
1363
1364 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1365 {
1366         if (substream->f_flags & O_NONBLOCK)
1367                 return -EAGAIN;
1368         substream->runtime->trigger_master = substream;
1369         return 0;
1370 }
1371
1372 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1373 {
1374         struct snd_pcm_runtime *runtime = substream->runtime;
1375         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1376                 switch (runtime->status->state) {
1377                 case SNDRV_PCM_STATE_PREPARED:
1378                         /* start playback stream if possible */
1379                         if (! snd_pcm_playback_empty(substream)) {
1380                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1381                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1382                         }
1383                         break;
1384                 case SNDRV_PCM_STATE_RUNNING:
1385                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1386                         break;
1387                 default:
1388                         break;
1389                 }
1390         } else {
1391                 /* stop running stream */
1392                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1393                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1394                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1395                         snd_pcm_do_stop(substream, new_state);
1396                         snd_pcm_post_stop(substream, new_state);
1397                 }
1398         }
1399         return 0;
1400 }
1401
1402 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1403 {
1404 }
1405
1406 static struct action_ops snd_pcm_action_drain_init = {
1407         .pre_action = snd_pcm_pre_drain_init,
1408         .do_action = snd_pcm_do_drain_init,
1409         .post_action = snd_pcm_post_drain_init
1410 };
1411
1412 struct drain_rec {
1413         struct snd_pcm_substream *substream;
1414         wait_queue_t wait;
1415         snd_pcm_uframes_t stop_threshold;
1416 };
1417
1418 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1419
1420 /*
1421  * Drain the stream(s).
1422  * When the substream is linked, sync until the draining of all playback streams
1423  * is finished.
1424  * After this call, all streams are supposed to be either SETUP or DRAINING
1425  * (capture only) state.
1426  */
1427 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1428 {
1429         struct snd_card *card;
1430         struct snd_pcm_runtime *runtime;
1431         struct snd_pcm_substream *s;
1432         int result = 0;
1433         int i, num_drecs;
1434         struct drain_rec *drec, drec_tmp, *d;
1435
1436         snd_assert(substream != NULL, return -ENXIO);
1437         card = substream->pcm->card;
1438         runtime = substream->runtime;
1439
1440         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1441                 return -EBADFD;
1442
1443         snd_power_lock(card);
1444         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1445                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1446                 if (result < 0) {
1447                         snd_power_unlock(card);
1448                         return result;
1449                 }
1450         }
1451
1452         /* allocate temporary record for drain sync */
1453         down_read(&snd_pcm_link_rwsem);
1454         if (snd_pcm_stream_linked(substream)) {
1455                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1456                 if (! drec) {
1457                         up_read(&snd_pcm_link_rwsem);
1458                         snd_power_unlock(card);
1459                         return -ENOMEM;
1460                 }
1461         } else
1462                 drec = &drec_tmp;
1463
1464         /* count only playback streams */
1465         num_drecs = 0;
1466         snd_pcm_group_for_each_entry(s, substream) {
1467                 runtime = s->runtime;
1468                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1469                         d = &drec[num_drecs++];
1470                         d->substream = s;
1471                         init_waitqueue_entry(&d->wait, current);
1472                         add_wait_queue(&runtime->sleep, &d->wait);
1473                         /* stop_threshold fixup to avoid endless loop when
1474                          * stop_threshold > buffer_size
1475                          */
1476                         d->stop_threshold = runtime->stop_threshold;
1477                         if (runtime->stop_threshold > runtime->buffer_size)
1478                                 runtime->stop_threshold = runtime->buffer_size;
1479                 }
1480         }
1481         up_read(&snd_pcm_link_rwsem);
1482
1483         snd_pcm_stream_lock_irq(substream);
1484         /* resume pause */
1485         if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1486                 snd_pcm_pause(substream, 0);
1487
1488         /* pre-start/stop - all running streams are changed to DRAINING state */
1489         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1490         if (result < 0) {
1491                 snd_pcm_stream_unlock_irq(substream);
1492                 goto _error;
1493         }
1494
1495         for (;;) {
1496                 long tout;
1497                 if (signal_pending(current)) {
1498                         result = -ERESTARTSYS;
1499                         break;
1500                 }
1501                 /* all finished? */
1502                 for (i = 0; i < num_drecs; i++) {
1503                         runtime = drec[i].substream->runtime;
1504                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1505                                 break;
1506                 }
1507                 if (i == num_drecs)
1508                         break; /* yes, all drained */
1509
1510                 set_current_state(TASK_INTERRUPTIBLE);
1511                 snd_pcm_stream_unlock_irq(substream);
1512                 snd_power_unlock(card);
1513                 tout = schedule_timeout(10 * HZ);
1514                 snd_power_lock(card);
1515                 snd_pcm_stream_lock_irq(substream);
1516                 if (tout == 0) {
1517                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1518                                 result = -ESTRPIPE;
1519                         else {
1520                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1521                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1522                                 result = -EIO;
1523                         }
1524                         break;
1525                 }
1526         }
1527
1528         snd_pcm_stream_unlock_irq(substream);
1529
1530  _error:
1531         for (i = 0; i < num_drecs; i++) {
1532                 d = &drec[i];
1533                 runtime = d->substream->runtime;
1534                 remove_wait_queue(&runtime->sleep, &d->wait);
1535                 runtime->stop_threshold = d->stop_threshold;
1536         }
1537
1538         if (drec != &drec_tmp)
1539                 kfree(drec);
1540         snd_power_unlock(card);
1541
1542         return result;
1543 }
1544
1545 /*
1546  * drop ioctl
1547  *
1548  * Immediately put all linked substreams into SETUP state.
1549  */
1550 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1551 {
1552         struct snd_pcm_runtime *runtime;
1553         struct snd_card *card;
1554         int result = 0;
1555
1556         snd_assert(substream != NULL, return -ENXIO);
1557         runtime = substream->runtime;
1558         card = substream->pcm->card;
1559
1560         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1561             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1562                 return -EBADFD;
1563
1564         snd_power_lock(card);
1565         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1566                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1567                 if (result < 0)
1568                         goto _unlock;
1569         }
1570
1571         snd_pcm_stream_lock_irq(substream);
1572         /* resume pause */
1573         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1574                 snd_pcm_pause(substream, 0);
1575
1576         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1577         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1578         snd_pcm_stream_unlock_irq(substream);
1579  _unlock:
1580         snd_power_unlock(card);
1581         return result;
1582 }
1583
1584
1585 /* WARNING: Don't forget to fput back the file */
1586 static struct file *snd_pcm_file_fd(int fd)
1587 {
1588         struct file *file;
1589         struct inode *inode;
1590         unsigned int minor;
1591
1592         file = fget(fd);
1593         if (!file)
1594                 return NULL;
1595         inode = file->f_path.dentry->d_inode;
1596         if (!S_ISCHR(inode->i_mode) ||
1597             imajor(inode) != snd_major) {
1598                 fput(file);
1599                 return NULL;
1600         }
1601         minor = iminor(inode);
1602         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1603             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1604                 fput(file);
1605                 return NULL;
1606         }
1607         return file;
1608 }
1609
1610 /*
1611  * PCM link handling
1612  */
1613 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1614 {
1615         int res = 0;
1616         struct file *file;
1617         struct snd_pcm_file *pcm_file;
1618         struct snd_pcm_substream *substream1;
1619
1620         file = snd_pcm_file_fd(fd);
1621         if (!file)
1622                 return -EBADFD;
1623         pcm_file = file->private_data;
1624         substream1 = pcm_file->substream;
1625         down_write(&snd_pcm_link_rwsem);
1626         write_lock_irq(&snd_pcm_link_rwlock);
1627         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1628             substream->runtime->status->state != substream1->runtime->status->state) {
1629                 res = -EBADFD;
1630                 goto _end;
1631         }
1632         if (snd_pcm_stream_linked(substream1)) {
1633                 res = -EALREADY;
1634                 goto _end;
1635         }
1636         if (!snd_pcm_stream_linked(substream)) {
1637                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1638                 if (substream->group == NULL) {
1639                         res = -ENOMEM;
1640                         goto _end;
1641                 }
1642                 spin_lock_init(&substream->group->lock);
1643                 INIT_LIST_HEAD(&substream->group->substreams);
1644                 list_add_tail(&substream->link_list, &substream->group->substreams);
1645                 substream->group->count = 1;
1646         }
1647         list_add_tail(&substream1->link_list, &substream->group->substreams);
1648         substream->group->count++;
1649         substream1->group = substream->group;
1650  _end:
1651         write_unlock_irq(&snd_pcm_link_rwlock);
1652         up_write(&snd_pcm_link_rwsem);
1653         fput(file);
1654         return res;
1655 }
1656
1657 static void relink_to_local(struct snd_pcm_substream *substream)
1658 {
1659         substream->group = &substream->self_group;
1660         INIT_LIST_HEAD(&substream->self_group.substreams);
1661         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1662 }
1663
1664 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1665 {
1666         struct snd_pcm_substream *s;
1667         int res = 0;
1668
1669         down_write(&snd_pcm_link_rwsem);
1670         write_lock_irq(&snd_pcm_link_rwlock);
1671         if (!snd_pcm_stream_linked(substream)) {
1672                 res = -EALREADY;
1673                 goto _end;
1674         }
1675         list_del(&substream->link_list);
1676         substream->group->count--;
1677         if (substream->group->count == 1) {     /* detach the last stream, too */
1678                 snd_pcm_group_for_each_entry(s, substream) {
1679                         relink_to_local(s);
1680                         break;
1681                 }
1682                 kfree(substream->group);
1683         }
1684         relink_to_local(substream);
1685        _end:
1686         write_unlock_irq(&snd_pcm_link_rwlock);
1687         up_write(&snd_pcm_link_rwsem);
1688         return res;
1689 }
1690
1691 /*
1692  * hw configurator
1693  */
1694 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1695                                struct snd_pcm_hw_rule *rule)
1696 {
1697         struct snd_interval t;
1698         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1699                      hw_param_interval_c(params, rule->deps[1]), &t);
1700         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1701 }
1702
1703 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1704                                struct snd_pcm_hw_rule *rule)
1705 {
1706         struct snd_interval t;
1707         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1708                      hw_param_interval_c(params, rule->deps[1]), &t);
1709         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1710 }
1711
1712 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1713                                    struct snd_pcm_hw_rule *rule)
1714 {
1715         struct snd_interval t;
1716         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1717                          hw_param_interval_c(params, rule->deps[1]),
1718                          (unsigned long) rule->private, &t);
1719         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1720 }
1721
1722 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1723                                    struct snd_pcm_hw_rule *rule)
1724 {
1725         struct snd_interval t;
1726         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1727                          (unsigned long) rule->private,
1728                          hw_param_interval_c(params, rule->deps[1]), &t);
1729         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1730 }
1731
1732 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1733                                   struct snd_pcm_hw_rule *rule)
1734 {
1735         unsigned int k;
1736         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1737         struct snd_mask m;
1738         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1739         snd_mask_any(&m);
1740         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1741                 int bits;
1742                 if (! snd_mask_test(mask, k))
1743                         continue;
1744                 bits = snd_pcm_format_physical_width(k);
1745                 if (bits <= 0)
1746                         continue; /* ignore invalid formats */
1747                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1748                         snd_mask_reset(&m, k);
1749         }
1750         return snd_mask_refine(mask, &m);
1751 }
1752
1753 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1754                                        struct snd_pcm_hw_rule *rule)
1755 {
1756         struct snd_interval t;
1757         unsigned int k;
1758         t.min = UINT_MAX;
1759         t.max = 0;
1760         t.openmin = 0;
1761         t.openmax = 0;
1762         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1763                 int bits;
1764                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1765                         continue;
1766                 bits = snd_pcm_format_physical_width(k);
1767                 if (bits <= 0)
1768                         continue; /* ignore invalid formats */
1769                 if (t.min > (unsigned)bits)
1770                         t.min = bits;
1771                 if (t.max < (unsigned)bits)
1772                         t.max = bits;
1773         }
1774         t.integer = 1;
1775         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1776 }
1777
1778 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1779 #error "Change this table"
1780 #endif
1781
1782 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1783                                  48000, 64000, 88200, 96000, 176400, 192000 };
1784
1785 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1786         .count = ARRAY_SIZE(rates),
1787         .list = rates,
1788 };
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                                  snd_pcm_known_rates.count,
1796                                  snd_pcm_known_rates.list, hw->rates);
1797 }
1798
1799 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1800                                             struct snd_pcm_hw_rule *rule)
1801 {
1802         struct snd_interval t;
1803         struct snd_pcm_substream *substream = rule->private;
1804         t.min = 0;
1805         t.max = substream->buffer_bytes_max;
1806         t.openmin = 0;
1807         t.openmax = 0;
1808         t.integer = 1;
1809         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1810 }
1811
1812 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1813 {
1814         struct snd_pcm_runtime *runtime = substream->runtime;
1815         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1816         int k, err;
1817
1818         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1819                 snd_mask_any(constrs_mask(constrs, k));
1820         }
1821
1822         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1823                 snd_interval_any(constrs_interval(constrs, k));
1824         }
1825
1826         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1827         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1828         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1829         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1830         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1831
1832         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1833                                    snd_pcm_hw_rule_format, NULL,
1834                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1835         if (err < 0)
1836                 return err;
1837         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1838                                   snd_pcm_hw_rule_sample_bits, NULL,
1839                                   SNDRV_PCM_HW_PARAM_FORMAT,
1840                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1841         if (err < 0)
1842                 return err;
1843         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1844                                   snd_pcm_hw_rule_div, NULL,
1845                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1846         if (err < 0)
1847                 return err;
1848         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1849                                   snd_pcm_hw_rule_mul, NULL,
1850                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1854                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1855                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1856         if (err < 0)
1857                 return err;
1858         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1860                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1861         if (err < 0)
1862                 return err;
1863         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1864                                   snd_pcm_hw_rule_div, NULL,
1865                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1866         if (err < 0)
1867                 return err;
1868         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1869                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1870                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1871         if (err < 0)
1872                 return err;
1873         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1874                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1875                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1876         if (err < 0)
1877                 return err;
1878         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1879                                   snd_pcm_hw_rule_div, NULL,
1880                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1881         if (err < 0)
1882                 return err;
1883         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1884                                   snd_pcm_hw_rule_div, NULL,
1885                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1886         if (err < 0)
1887                 return err;
1888         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1889                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1890                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1891         if (err < 0)
1892                 return err;
1893         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1895                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1896         if (err < 0)
1897                 return err;
1898         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1899                                   snd_pcm_hw_rule_mul, NULL,
1900                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1901         if (err < 0)
1902                 return err;
1903         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1904                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1905                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1906         if (err < 0)
1907                 return err;
1908         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1910                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1911         if (err < 0)
1912                 return err;
1913         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1914                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1915                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1916         if (err < 0)
1917                 return err;
1918         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1919                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1920                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1921         if (err < 0)
1922                 return err;
1923         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1924                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1925                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1926         if (err < 0)
1927                 return err;
1928         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1929                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1930                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1931         if (err < 0)
1932                 return err;
1933         return 0;
1934 }
1935
1936 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1937 {
1938         struct snd_pcm_runtime *runtime = substream->runtime;
1939         struct snd_pcm_hardware *hw = &runtime->hw;
1940         int err;
1941         unsigned int mask = 0;
1942
1943         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1944                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1945         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1946                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1947         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1948                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1949                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1950                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1951                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1952                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1953                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1954         }
1955         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1956         snd_assert(err >= 0, return -EINVAL);
1957
1958         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1959         snd_assert(err >= 0, return -EINVAL);
1960
1961         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1962         snd_assert(err >= 0, return -EINVAL);
1963
1964         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1965                                            hw->channels_min, hw->channels_max);
1966         snd_assert(err >= 0, return -EINVAL);
1967
1968         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1969                                            hw->rate_min, hw->rate_max);
1970         snd_assert(err >= 0, return -EINVAL);
1971
1972         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1973                                            hw->period_bytes_min, hw->period_bytes_max);
1974         snd_assert(err >= 0, return -EINVAL);
1975
1976         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1977                                            hw->periods_min, hw->periods_max);
1978         snd_assert(err >= 0, return -EINVAL);
1979
1980         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1981                                            hw->period_bytes_min, hw->buffer_bytes_max);
1982         snd_assert(err >= 0, return -EINVAL);
1983
1984         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1985                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1986                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1987         if (err < 0)
1988                 return err;
1989
1990         /* FIXME: remove */
1991         if (runtime->dma_bytes) {
1992                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1993                 snd_assert(err >= 0, return -EINVAL);
1994         }
1995
1996         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1997                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1998                                           snd_pcm_hw_rule_rate, hw,
1999                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2000                 if (err < 0)
2001                         return err;
2002         }
2003
2004         /* FIXME: this belong to lowlevel */
2005         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_TICK_TIME,
2006                                      1000000 / HZ, 1000000 / HZ);
2007         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2008
2009         return 0;
2010 }
2011
2012 static void pcm_release_private(struct snd_pcm_substream *substream)
2013 {
2014         snd_pcm_unlink(substream);
2015 }
2016
2017 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2018 {
2019         substream->ref_count--;
2020         if (substream->ref_count > 0)
2021                 return;
2022
2023         snd_pcm_drop(substream);
2024         if (substream->hw_opened) {
2025                 if (substream->ops->hw_free != NULL)
2026                         substream->ops->hw_free(substream);
2027                 substream->ops->close(substream);
2028                 substream->hw_opened = 0;
2029         }
2030         if (substream->pcm_release) {
2031                 substream->pcm_release(substream);
2032                 substream->pcm_release = NULL;
2033         }
2034         snd_pcm_detach_substream(substream);
2035 }
2036
2037 EXPORT_SYMBOL(snd_pcm_release_substream);
2038
2039 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2040                            struct file *file,
2041                            struct snd_pcm_substream **rsubstream)
2042 {
2043         struct snd_pcm_substream *substream;
2044         int err;
2045
2046         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2047         if (err < 0)
2048                 return err;
2049         if (substream->ref_count > 1) {
2050                 *rsubstream = substream;
2051                 return 0;
2052         }
2053
2054         err = snd_pcm_hw_constraints_init(substream);
2055         if (err < 0) {
2056                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2057                 goto error;
2058         }
2059
2060         if ((err = substream->ops->open(substream)) < 0)
2061                 goto error;
2062
2063         substream->hw_opened = 1;
2064
2065         err = snd_pcm_hw_constraints_complete(substream);
2066         if (err < 0) {
2067                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2068                 goto error;
2069         }
2070
2071         *rsubstream = substream;
2072         return 0;
2073
2074  error:
2075         snd_pcm_release_substream(substream);
2076         return err;
2077 }
2078
2079 EXPORT_SYMBOL(snd_pcm_open_substream);
2080
2081 static int snd_pcm_open_file(struct file *file,
2082                              struct snd_pcm *pcm,
2083                              int stream,
2084                              struct snd_pcm_file **rpcm_file)
2085 {
2086         struct snd_pcm_file *pcm_file;
2087         struct snd_pcm_substream *substream;
2088         struct snd_pcm_str *str;
2089         int err;
2090
2091         snd_assert(rpcm_file != NULL, return -EINVAL);
2092         *rpcm_file = NULL;
2093
2094         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2095         if (err < 0)
2096                 return err;
2097
2098         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2099         if (pcm_file == NULL) {
2100                 snd_pcm_release_substream(substream);
2101                 return -ENOMEM;
2102         }
2103         pcm_file->substream = substream;
2104         if (substream->ref_count == 1) {
2105                 str = substream->pstr;
2106                 substream->file = pcm_file;
2107                 substream->pcm_release = pcm_release_private;
2108         }
2109         file->private_data = pcm_file;
2110         *rpcm_file = pcm_file;
2111         return 0;
2112 }
2113
2114 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2115 {
2116         struct snd_pcm *pcm;
2117
2118         pcm = snd_lookup_minor_data(iminor(inode),
2119                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2120         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2121 }
2122
2123 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2124 {
2125         struct snd_pcm *pcm;
2126
2127         pcm = snd_lookup_minor_data(iminor(inode),
2128                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2129         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2130 }
2131
2132 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2133 {
2134         int err;
2135         struct snd_pcm_file *pcm_file;
2136         wait_queue_t wait;
2137
2138         if (pcm == NULL) {
2139                 err = -ENODEV;
2140                 goto __error1;
2141         }
2142         err = snd_card_file_add(pcm->card, file);
2143         if (err < 0)
2144                 goto __error1;
2145         if (!try_module_get(pcm->card->module)) {
2146                 err = -EFAULT;
2147                 goto __error2;
2148         }
2149         init_waitqueue_entry(&wait, current);
2150         add_wait_queue(&pcm->open_wait, &wait);
2151         mutex_lock(&pcm->open_mutex);
2152         while (1) {
2153                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2154                 if (err >= 0)
2155                         break;
2156                 if (err == -EAGAIN) {
2157                         if (file->f_flags & O_NONBLOCK) {
2158                                 err = -EBUSY;
2159                                 break;
2160                         }
2161                 } else
2162                         break;
2163                 set_current_state(TASK_INTERRUPTIBLE);
2164                 mutex_unlock(&pcm->open_mutex);
2165                 schedule();
2166                 mutex_lock(&pcm->open_mutex);
2167                 if (signal_pending(current)) {
2168                         err = -ERESTARTSYS;
2169                         break;
2170                 }
2171         }
2172         remove_wait_queue(&pcm->open_wait, &wait);
2173         mutex_unlock(&pcm->open_mutex);
2174         if (err < 0)
2175                 goto __error;
2176         return err;
2177
2178       __error:
2179         module_put(pcm->card->module);
2180       __error2:
2181         snd_card_file_remove(pcm->card, file);
2182       __error1:
2183         return err;
2184 }
2185
2186 static int snd_pcm_release(struct inode *inode, struct file *file)
2187 {
2188         struct snd_pcm *pcm;
2189         struct snd_pcm_substream *substream;
2190         struct snd_pcm_file *pcm_file;
2191
2192         pcm_file = file->private_data;
2193         substream = pcm_file->substream;
2194         snd_assert(substream != NULL, return -ENXIO);
2195         pcm = substream->pcm;
2196         fasync_helper(-1, file, 0, &substream->runtime->fasync);
2197         mutex_lock(&pcm->open_mutex);
2198         snd_pcm_release_substream(substream);
2199         kfree(pcm_file);
2200         mutex_unlock(&pcm->open_mutex);
2201         wake_up(&pcm->open_wait);
2202         module_put(pcm->card->module);
2203         snd_card_file_remove(pcm->card, file);
2204         return 0;
2205 }
2206
2207 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2208                                                  snd_pcm_uframes_t frames)
2209 {
2210         struct snd_pcm_runtime *runtime = substream->runtime;
2211         snd_pcm_sframes_t appl_ptr;
2212         snd_pcm_sframes_t ret;
2213         snd_pcm_sframes_t hw_avail;
2214
2215         if (frames == 0)
2216                 return 0;
2217
2218         snd_pcm_stream_lock_irq(substream);
2219         switch (runtime->status->state) {
2220         case SNDRV_PCM_STATE_PREPARED:
2221                 break;
2222         case SNDRV_PCM_STATE_DRAINING:
2223         case SNDRV_PCM_STATE_RUNNING:
2224                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2225                         break;
2226                 /* Fall through */
2227         case SNDRV_PCM_STATE_XRUN:
2228                 ret = -EPIPE;
2229                 goto __end;
2230         default:
2231                 ret = -EBADFD;
2232                 goto __end;
2233         }
2234
2235         hw_avail = snd_pcm_playback_hw_avail(runtime);
2236         if (hw_avail <= 0) {
2237                 ret = 0;
2238                 goto __end;
2239         }
2240         if (frames > (snd_pcm_uframes_t)hw_avail)
2241                 frames = hw_avail;
2242         else
2243                 frames -= frames % runtime->xfer_align;
2244         appl_ptr = runtime->control->appl_ptr - frames;
2245         if (appl_ptr < 0)
2246                 appl_ptr += runtime->boundary;
2247         runtime->control->appl_ptr = appl_ptr;
2248         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2249             runtime->sleep_min)
2250                 snd_pcm_tick_prepare(substream);
2251         ret = frames;
2252  __end:
2253         snd_pcm_stream_unlock_irq(substream);
2254         return ret;
2255 }
2256
2257 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2258                                                 snd_pcm_uframes_t frames)
2259 {
2260         struct snd_pcm_runtime *runtime = substream->runtime;
2261         snd_pcm_sframes_t appl_ptr;
2262         snd_pcm_sframes_t ret;
2263         snd_pcm_sframes_t hw_avail;
2264
2265         if (frames == 0)
2266                 return 0;
2267
2268         snd_pcm_stream_lock_irq(substream);
2269         switch (runtime->status->state) {
2270         case SNDRV_PCM_STATE_PREPARED:
2271         case SNDRV_PCM_STATE_DRAINING:
2272                 break;
2273         case SNDRV_PCM_STATE_RUNNING:
2274                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2275                         break;
2276                 /* Fall through */
2277         case SNDRV_PCM_STATE_XRUN:
2278                 ret = -EPIPE;
2279                 goto __end;
2280         default:
2281                 ret = -EBADFD;
2282                 goto __end;
2283         }
2284
2285         hw_avail = snd_pcm_capture_hw_avail(runtime);
2286         if (hw_avail <= 0) {
2287                 ret = 0;
2288                 goto __end;
2289         }
2290         if (frames > (snd_pcm_uframes_t)hw_avail)
2291                 frames = hw_avail;
2292         else
2293                 frames -= frames % runtime->xfer_align;
2294         appl_ptr = runtime->control->appl_ptr - frames;
2295         if (appl_ptr < 0)
2296                 appl_ptr += runtime->boundary;
2297         runtime->control->appl_ptr = appl_ptr;
2298         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2299             runtime->sleep_min)
2300                 snd_pcm_tick_prepare(substream);
2301         ret = frames;
2302  __end:
2303         snd_pcm_stream_unlock_irq(substream);
2304         return ret;
2305 }
2306
2307 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2308                                                   snd_pcm_uframes_t frames)
2309 {
2310         struct snd_pcm_runtime *runtime = substream->runtime;
2311         snd_pcm_sframes_t appl_ptr;
2312         snd_pcm_sframes_t ret;
2313         snd_pcm_sframes_t avail;
2314
2315         if (frames == 0)
2316                 return 0;
2317
2318         snd_pcm_stream_lock_irq(substream);
2319         switch (runtime->status->state) {
2320         case SNDRV_PCM_STATE_PREPARED:
2321         case SNDRV_PCM_STATE_PAUSED:
2322                 break;
2323         case SNDRV_PCM_STATE_DRAINING:
2324         case SNDRV_PCM_STATE_RUNNING:
2325                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2326                         break;
2327                 /* Fall through */
2328         case SNDRV_PCM_STATE_XRUN:
2329                 ret = -EPIPE;
2330                 goto __end;
2331         default:
2332                 ret = -EBADFD;
2333                 goto __end;
2334         }
2335
2336         avail = snd_pcm_playback_avail(runtime);
2337         if (avail <= 0) {
2338                 ret = 0;
2339                 goto __end;
2340         }
2341         if (frames > (snd_pcm_uframes_t)avail)
2342                 frames = avail;
2343         else
2344                 frames -= frames % runtime->xfer_align;
2345         appl_ptr = runtime->control->appl_ptr + frames;
2346         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2347                 appl_ptr -= runtime->boundary;
2348         runtime->control->appl_ptr = appl_ptr;
2349         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2350             runtime->sleep_min)
2351                 snd_pcm_tick_prepare(substream);
2352         ret = frames;
2353  __end:
2354         snd_pcm_stream_unlock_irq(substream);
2355         return ret;
2356 }
2357
2358 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2359                                                  snd_pcm_uframes_t frames)
2360 {
2361         struct snd_pcm_runtime *runtime = substream->runtime;
2362         snd_pcm_sframes_t appl_ptr;
2363         snd_pcm_sframes_t ret;
2364         snd_pcm_sframes_t avail;
2365
2366         if (frames == 0)
2367                 return 0;
2368
2369         snd_pcm_stream_lock_irq(substream);
2370         switch (runtime->status->state) {
2371         case SNDRV_PCM_STATE_PREPARED:
2372         case SNDRV_PCM_STATE_DRAINING:
2373         case SNDRV_PCM_STATE_PAUSED:
2374                 break;
2375         case SNDRV_PCM_STATE_RUNNING:
2376                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2377                         break;
2378                 /* Fall through */
2379         case SNDRV_PCM_STATE_XRUN:
2380                 ret = -EPIPE;
2381                 goto __end;
2382         default:
2383                 ret = -EBADFD;
2384                 goto __end;
2385         }
2386
2387         avail = snd_pcm_capture_avail(runtime);
2388         if (avail <= 0) {
2389                 ret = 0;
2390                 goto __end;
2391         }
2392         if (frames > (snd_pcm_uframes_t)avail)
2393                 frames = avail;
2394         else
2395                 frames -= frames % runtime->xfer_align;
2396         appl_ptr = runtime->control->appl_ptr + frames;
2397         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2398                 appl_ptr -= runtime->boundary;
2399         runtime->control->appl_ptr = appl_ptr;
2400         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2401             runtime->sleep_min)
2402                 snd_pcm_tick_prepare(substream);
2403         ret = frames;
2404  __end:
2405         snd_pcm_stream_unlock_irq(substream);
2406         return ret;
2407 }
2408
2409 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2410 {
2411         struct snd_pcm_runtime *runtime = substream->runtime;
2412         int err;
2413
2414         snd_pcm_stream_lock_irq(substream);
2415         switch (runtime->status->state) {
2416         case SNDRV_PCM_STATE_DRAINING:
2417                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2418                         goto __badfd;
2419         case SNDRV_PCM_STATE_RUNNING:
2420                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2421                         break;
2422                 /* Fall through */
2423         case SNDRV_PCM_STATE_PREPARED:
2424         case SNDRV_PCM_STATE_SUSPENDED:
2425                 err = 0;
2426                 break;
2427         case SNDRV_PCM_STATE_XRUN:
2428                 err = -EPIPE;
2429                 break;
2430         default:
2431               __badfd:
2432                 err = -EBADFD;
2433                 break;
2434         }
2435         snd_pcm_stream_unlock_irq(substream);
2436         return err;
2437 }
2438
2439 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2440                          snd_pcm_sframes_t __user *res)
2441 {
2442         struct snd_pcm_runtime *runtime = substream->runtime;
2443         int err;
2444         snd_pcm_sframes_t n = 0;
2445
2446         snd_pcm_stream_lock_irq(substream);
2447         switch (runtime->status->state) {
2448         case SNDRV_PCM_STATE_DRAINING:
2449                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2450                         goto __badfd;
2451         case SNDRV_PCM_STATE_RUNNING:
2452                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2453                         break;
2454                 /* Fall through */
2455         case SNDRV_PCM_STATE_PREPARED:
2456         case SNDRV_PCM_STATE_SUSPENDED:
2457                 err = 0;
2458                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2459                         n = snd_pcm_playback_hw_avail(runtime);
2460                 else
2461                         n = snd_pcm_capture_avail(runtime);
2462                 break;
2463         case SNDRV_PCM_STATE_XRUN:
2464                 err = -EPIPE;
2465                 break;
2466         default:
2467               __badfd:
2468                 err = -EBADFD;
2469                 break;
2470         }
2471         snd_pcm_stream_unlock_irq(substream);
2472         if (!err)
2473                 if (put_user(n, res))
2474                         err = -EFAULT;
2475         return err;
2476 }
2477
2478 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2479                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2480 {
2481         struct snd_pcm_runtime *runtime = substream->runtime;
2482         struct snd_pcm_sync_ptr sync_ptr;
2483         volatile struct snd_pcm_mmap_status *status;
2484         volatile struct snd_pcm_mmap_control *control;
2485         int err;
2486
2487         memset(&sync_ptr, 0, sizeof(sync_ptr));
2488         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2489                 return -EFAULT;
2490         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2491                 return -EFAULT;
2492         status = runtime->status;
2493         control = runtime->control;
2494         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2495                 err = snd_pcm_hwsync(substream);
2496                 if (err < 0)
2497                         return err;
2498         }
2499         snd_pcm_stream_lock_irq(substream);
2500         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2501                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2502         else
2503                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2504         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2505                 control->avail_min = sync_ptr.c.control.avail_min;
2506         else
2507                 sync_ptr.c.control.avail_min = control->avail_min;
2508         sync_ptr.s.status.state = status->state;
2509         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2510         sync_ptr.s.status.tstamp = status->tstamp;
2511         sync_ptr.s.status.suspended_state = status->suspended_state;
2512         snd_pcm_stream_unlock_irq(substream);
2513         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2514                 return -EFAULT;
2515         return 0;
2516 }
2517
2518 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2519 {
2520         struct snd_pcm_runtime *runtime = substream->runtime;
2521         int arg;
2522
2523         if (get_user(arg, _arg))
2524                 return -EFAULT;
2525         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2526                 return -EINVAL;
2527         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2528         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2529                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2530         return 0;
2531 }
2532
2533 static int snd_pcm_common_ioctl1(struct file *file,
2534                                  struct snd_pcm_substream *substream,
2535                                  unsigned int cmd, void __user *arg)
2536 {
2537         snd_assert(substream != NULL, return -ENXIO);
2538
2539         switch (cmd) {
2540         case SNDRV_PCM_IOCTL_PVERSION:
2541                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2542         case SNDRV_PCM_IOCTL_INFO:
2543                 return snd_pcm_info_user(substream, arg);
2544         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2545                 return 0;
2546         case SNDRV_PCM_IOCTL_TTSTAMP:
2547                 return snd_pcm_tstamp(substream, arg);
2548         case SNDRV_PCM_IOCTL_HW_REFINE:
2549                 return snd_pcm_hw_refine_user(substream, arg);
2550         case SNDRV_PCM_IOCTL_HW_PARAMS:
2551                 return snd_pcm_hw_params_user(substream, arg);
2552         case SNDRV_PCM_IOCTL_HW_FREE:
2553                 return snd_pcm_hw_free(substream);
2554         case SNDRV_PCM_IOCTL_SW_PARAMS:
2555                 return snd_pcm_sw_params_user(substream, arg);
2556         case SNDRV_PCM_IOCTL_STATUS:
2557                 return snd_pcm_status_user(substream, arg);
2558         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2559                 return snd_pcm_channel_info_user(substream, arg);
2560         case SNDRV_PCM_IOCTL_PREPARE:
2561                 return snd_pcm_prepare(substream, file);
2562         case SNDRV_PCM_IOCTL_RESET:
2563                 return snd_pcm_reset(substream);
2564         case SNDRV_PCM_IOCTL_START:
2565                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2566         case SNDRV_PCM_IOCTL_LINK:
2567                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2568         case SNDRV_PCM_IOCTL_UNLINK:
2569                 return snd_pcm_unlink(substream);
2570         case SNDRV_PCM_IOCTL_RESUME:
2571                 return snd_pcm_resume(substream);
2572         case SNDRV_PCM_IOCTL_XRUN:
2573                 return snd_pcm_xrun(substream);
2574         case SNDRV_PCM_IOCTL_HWSYNC:
2575                 return snd_pcm_hwsync(substream);
2576         case SNDRV_PCM_IOCTL_DELAY:
2577                 return snd_pcm_delay(substream, arg);
2578         case SNDRV_PCM_IOCTL_SYNC_PTR:
2579                 return snd_pcm_sync_ptr(substream, arg);
2580 #ifdef CONFIG_SND_SUPPORT_OLD_API
2581         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2582                 return snd_pcm_hw_refine_old_user(substream, arg);
2583         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2584                 return snd_pcm_hw_params_old_user(substream, arg);
2585 #endif
2586         case SNDRV_PCM_IOCTL_DRAIN:
2587                 return snd_pcm_drain(substream);
2588         case SNDRV_PCM_IOCTL_DROP:
2589                 return snd_pcm_drop(substream);
2590         case SNDRV_PCM_IOCTL_PAUSE:
2591         {
2592                 int res;
2593                 snd_pcm_stream_lock_irq(substream);
2594                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2595                 snd_pcm_stream_unlock_irq(substream);
2596                 return res;
2597         }
2598         }
2599         snd_printd("unknown ioctl = 0x%x\n", cmd);
2600         return -ENOTTY;
2601 }
2602
2603 static int snd_pcm_playback_ioctl1(struct file *file,
2604                                    struct snd_pcm_substream *substream,
2605                                    unsigned int cmd, void __user *arg)
2606 {
2607         snd_assert(substream != NULL, return -ENXIO);
2608         snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL);
2609         switch (cmd) {
2610         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2611         {
2612                 struct snd_xferi xferi;
2613                 struct snd_xferi __user *_xferi = arg;
2614                 struct snd_pcm_runtime *runtime = substream->runtime;
2615                 snd_pcm_sframes_t result;
2616                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2617                         return -EBADFD;
2618                 if (put_user(0, &_xferi->result))
2619                         return -EFAULT;
2620                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2621                         return -EFAULT;
2622                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2623                 __put_user(result, &_xferi->result);
2624                 return result < 0 ? result : 0;
2625         }
2626         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2627         {
2628                 struct snd_xfern xfern;
2629                 struct snd_xfern __user *_xfern = arg;
2630                 struct snd_pcm_runtime *runtime = substream->runtime;
2631                 void __user **bufs;
2632                 snd_pcm_sframes_t result;
2633                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2634                         return -EBADFD;
2635                 if (runtime->channels > 128)
2636                         return -EINVAL;
2637                 if (put_user(0, &_xfern->result))
2638                         return -EFAULT;
2639                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2640                         return -EFAULT;
2641                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2642                 if (bufs == NULL)
2643                         return -ENOMEM;
2644                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2645                         kfree(bufs);
2646                         return -EFAULT;
2647                 }
2648                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2649                 kfree(bufs);
2650                 __put_user(result, &_xfern->result);
2651                 return result < 0 ? result : 0;
2652         }
2653         case SNDRV_PCM_IOCTL_REWIND:
2654         {
2655                 snd_pcm_uframes_t frames;
2656                 snd_pcm_uframes_t __user *_frames = arg;
2657                 snd_pcm_sframes_t result;
2658                 if (get_user(frames, _frames))
2659                         return -EFAULT;
2660                 if (put_user(0, _frames))
2661                         return -EFAULT;
2662                 result = snd_pcm_playback_rewind(substream, frames);
2663                 __put_user(result, _frames);
2664                 return result < 0 ? result : 0;
2665         }
2666         case SNDRV_PCM_IOCTL_FORWARD:
2667         {
2668                 snd_pcm_uframes_t frames;
2669                 snd_pcm_uframes_t __user *_frames = arg;
2670                 snd_pcm_sframes_t result;
2671                 if (get_user(frames, _frames))
2672                         return -EFAULT;
2673                 if (put_user(0, _frames))
2674                         return -EFAULT;
2675                 result = snd_pcm_playback_forward(substream, frames);
2676                 __put_user(result, _frames);
2677                 return result < 0 ? result : 0;
2678         }
2679         }
2680         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2681 }
2682
2683 static int snd_pcm_capture_ioctl1(struct file *file,
2684                                   struct snd_pcm_substream *substream,
2685                                   unsigned int cmd, void __user *arg)
2686 {
2687         snd_assert(substream != NULL, return -ENXIO);
2688         snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL);
2689         switch (cmd) {
2690         case SNDRV_PCM_IOCTL_READI_FRAMES:
2691         {
2692                 struct snd_xferi xferi;
2693                 struct snd_xferi __user *_xferi = arg;
2694                 struct snd_pcm_runtime *runtime = substream->runtime;
2695                 snd_pcm_sframes_t result;
2696                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2697                         return -EBADFD;
2698                 if (put_user(0, &_xferi->result))
2699                         return -EFAULT;
2700                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2701                         return -EFAULT;
2702                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2703                 __put_user(result, &_xferi->result);
2704                 return result < 0 ? result : 0;
2705         }
2706         case SNDRV_PCM_IOCTL_READN_FRAMES:
2707         {
2708                 struct snd_xfern xfern;
2709                 struct snd_xfern __user *_xfern = arg;
2710                 struct snd_pcm_runtime *runtime = substream->runtime;
2711                 void *bufs;
2712                 snd_pcm_sframes_t result;
2713                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2714                         return -EBADFD;
2715                 if (runtime->channels > 128)
2716                         return -EINVAL;
2717                 if (put_user(0, &_xfern->result))
2718                         return -EFAULT;
2719                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2720                         return -EFAULT;
2721                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2722                 if (bufs == NULL)
2723                         return -ENOMEM;
2724                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2725                         kfree(bufs);
2726                         return -EFAULT;
2727                 }
2728                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2729                 kfree(bufs);
2730                 __put_user(result, &_xfern->result);
2731                 return result < 0 ? result : 0;
2732         }
2733         case SNDRV_PCM_IOCTL_REWIND:
2734         {
2735                 snd_pcm_uframes_t frames;
2736                 snd_pcm_uframes_t __user *_frames = arg;
2737                 snd_pcm_sframes_t result;
2738                 if (get_user(frames, _frames))
2739                         return -EFAULT;
2740                 if (put_user(0, _frames))
2741                         return -EFAULT;
2742                 result = snd_pcm_capture_rewind(substream, frames);
2743                 __put_user(result, _frames);
2744                 return result < 0 ? result : 0;
2745         }
2746         case SNDRV_PCM_IOCTL_FORWARD:
2747         {
2748                 snd_pcm_uframes_t frames;
2749                 snd_pcm_uframes_t __user *_frames = arg;
2750                 snd_pcm_sframes_t result;
2751                 if (get_user(frames, _frames))
2752                         return -EFAULT;
2753                 if (put_user(0, _frames))
2754                         return -EFAULT;
2755                 result = snd_pcm_capture_forward(substream, frames);
2756                 __put_user(result, _frames);
2757                 return result < 0 ? result : 0;
2758         }
2759         }
2760         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2761 }
2762
2763 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2764                                    unsigned long arg)
2765 {
2766         struct snd_pcm_file *pcm_file;
2767
2768         pcm_file = file->private_data;
2769
2770         if (((cmd >> 8) & 0xff) != 'A')
2771                 return -ENOTTY;
2772
2773         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2774                                        (void __user *)arg);
2775 }
2776
2777 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2778                                   unsigned long arg)
2779 {
2780         struct snd_pcm_file *pcm_file;
2781
2782         pcm_file = file->private_data;
2783
2784         if (((cmd >> 8) & 0xff) != 'A')
2785                 return -ENOTTY;
2786
2787         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2788                                       (void __user *)arg);
2789 }
2790
2791 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2792                          unsigned int cmd, void *arg)
2793 {
2794         mm_segment_t fs;
2795         int result;
2796
2797         fs = snd_enter_user();
2798         switch (substream->stream) {
2799         case SNDRV_PCM_STREAM_PLAYBACK:
2800                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2801                                                  (void __user *)arg);
2802                 break;
2803         case SNDRV_PCM_STREAM_CAPTURE:
2804                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2805                                                 (void __user *)arg);
2806                 break;
2807         default:
2808                 result = -EINVAL;
2809                 break;
2810         }
2811         snd_leave_user(fs);
2812         return result;
2813 }
2814
2815 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2816
2817 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2818                             loff_t * offset)
2819 {
2820         struct snd_pcm_file *pcm_file;
2821         struct snd_pcm_substream *substream;
2822         struct snd_pcm_runtime *runtime;
2823         snd_pcm_sframes_t result;
2824
2825         pcm_file = file->private_data;
2826         substream = pcm_file->substream;
2827         snd_assert(substream != NULL, return -ENXIO);
2828         runtime = substream->runtime;
2829         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2830                 return -EBADFD;
2831         if (!frame_aligned(runtime, count))
2832                 return -EINVAL;
2833         count = bytes_to_frames(runtime, count);
2834         result = snd_pcm_lib_read(substream, buf, count);
2835         if (result > 0)
2836                 result = frames_to_bytes(runtime, result);
2837         return result;
2838 }
2839
2840 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2841                              size_t count, loff_t * offset)
2842 {
2843         struct snd_pcm_file *pcm_file;
2844         struct snd_pcm_substream *substream;
2845         struct snd_pcm_runtime *runtime;
2846         snd_pcm_sframes_t result;
2847
2848         pcm_file = file->private_data;
2849         substream = pcm_file->substream;
2850         snd_assert(substream != NULL, result = -ENXIO; goto end);
2851         runtime = substream->runtime;
2852         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2853                 result = -EBADFD;
2854                 goto end;
2855         }
2856         if (!frame_aligned(runtime, count)) {
2857                 result = -EINVAL;
2858                 goto end;
2859         }
2860         count = bytes_to_frames(runtime, count);
2861         result = snd_pcm_lib_write(substream, buf, count);
2862         if (result > 0)
2863                 result = frames_to_bytes(runtime, result);
2864  end:
2865         return result;
2866 }
2867
2868 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2869                              unsigned long nr_segs, loff_t pos)
2870
2871 {
2872         struct snd_pcm_file *pcm_file;
2873         struct snd_pcm_substream *substream;
2874         struct snd_pcm_runtime *runtime;
2875         snd_pcm_sframes_t result;
2876         unsigned long i;
2877         void __user **bufs;
2878         snd_pcm_uframes_t frames;
2879
2880         pcm_file = iocb->ki_filp->private_data;
2881         substream = pcm_file->substream;
2882         snd_assert(substream != NULL, return -ENXIO);
2883         runtime = substream->runtime;
2884         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2885                 return -EBADFD;
2886         if (nr_segs > 1024 || nr_segs != runtime->channels)
2887                 return -EINVAL;
2888         if (!frame_aligned(runtime, iov->iov_len))
2889                 return -EINVAL;
2890         frames = bytes_to_samples(runtime, iov->iov_len);
2891         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2892         if (bufs == NULL)
2893                 return -ENOMEM;
2894         for (i = 0; i < nr_segs; ++i)
2895                 bufs[i] = iov[i].iov_base;
2896         result = snd_pcm_lib_readv(substream, bufs, frames);
2897         if (result > 0)
2898                 result = frames_to_bytes(runtime, result);
2899         kfree(bufs);
2900         return result;
2901 }
2902
2903 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2904                               unsigned long nr_segs, loff_t pos)
2905 {
2906         struct snd_pcm_file *pcm_file;
2907         struct snd_pcm_substream *substream;
2908         struct snd_pcm_runtime *runtime;
2909         snd_pcm_sframes_t result;
2910         unsigned long i;
2911         void __user **bufs;
2912         snd_pcm_uframes_t frames;
2913
2914         pcm_file = iocb->ki_filp->private_data;
2915         substream = pcm_file->substream;
2916         snd_assert(substream != NULL, result = -ENXIO; goto end);
2917         runtime = substream->runtime;
2918         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2919                 result = -EBADFD;
2920                 goto end;
2921         }
2922         if (nr_segs > 128 || nr_segs != runtime->channels ||
2923             !frame_aligned(runtime, iov->iov_len)) {
2924                 result = -EINVAL;
2925                 goto end;
2926         }
2927         frames = bytes_to_samples(runtime, iov->iov_len);
2928         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2929         if (bufs == NULL)
2930                 return -ENOMEM;
2931         for (i = 0; i < nr_segs; ++i)
2932                 bufs[i] = iov[i].iov_base;
2933         result = snd_pcm_lib_writev(substream, bufs, frames);
2934         if (result > 0)
2935                 result = frames_to_bytes(runtime, result);
2936         kfree(bufs);
2937  end:
2938         return result;
2939 }
2940
2941 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2942 {
2943         struct snd_pcm_file *pcm_file;
2944         struct snd_pcm_substream *substream;
2945         struct snd_pcm_runtime *runtime;
2946         unsigned int mask;
2947         snd_pcm_uframes_t avail;
2948
2949         pcm_file = file->private_data;
2950
2951         substream = pcm_file->substream;
2952         snd_assert(substream != NULL, return -ENXIO);
2953         runtime = substream->runtime;
2954
2955         poll_wait(file, &runtime->sleep, wait);
2956
2957         snd_pcm_stream_lock_irq(substream);
2958         avail = snd_pcm_playback_avail(runtime);
2959         switch (runtime->status->state) {
2960         case SNDRV_PCM_STATE_RUNNING:
2961         case SNDRV_PCM_STATE_PREPARED:
2962         case SNDRV_PCM_STATE_PAUSED:
2963                 if (avail >= runtime->control->avail_min) {
2964                         mask = POLLOUT | POLLWRNORM;
2965                         break;
2966                 }
2967                 /* Fall through */
2968         case SNDRV_PCM_STATE_DRAINING:
2969                 mask = 0;
2970                 break;
2971         default:
2972                 mask = POLLOUT | POLLWRNORM | POLLERR;
2973                 break;
2974         }
2975         snd_pcm_stream_unlock_irq(substream);
2976         return mask;
2977 }
2978
2979 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2980 {
2981         struct snd_pcm_file *pcm_file;
2982         struct snd_pcm_substream *substream;
2983         struct snd_pcm_runtime *runtime;
2984         unsigned int mask;
2985         snd_pcm_uframes_t avail;
2986
2987         pcm_file = file->private_data;
2988
2989         substream = pcm_file->substream;
2990         snd_assert(substream != NULL, return -ENXIO);
2991         runtime = substream->runtime;
2992
2993         poll_wait(file, &runtime->sleep, wait);
2994
2995         snd_pcm_stream_lock_irq(substream);
2996         avail = snd_pcm_capture_avail(runtime);
2997         switch (runtime->status->state) {
2998         case SNDRV_PCM_STATE_RUNNING:
2999         case SNDRV_PCM_STATE_PREPARED:
3000         case SNDRV_PCM_STATE_PAUSED:
3001                 if (avail >= runtime->control->avail_min) {
3002                         mask = POLLIN | POLLRDNORM;
3003                         break;
3004                 }
3005                 mask = 0;
3006                 break;
3007         case SNDRV_PCM_STATE_DRAINING:
3008                 if (avail > 0) {
3009                         mask = POLLIN | POLLRDNORM;
3010                         break;
3011                 }
3012                 /* Fall through */
3013         default:
3014                 mask = POLLIN | POLLRDNORM | POLLERR;
3015                 break;
3016         }
3017         snd_pcm_stream_unlock_irq(substream);
3018         return mask;
3019 }
3020
3021 /*
3022  * mmap support
3023  */
3024
3025 /*
3026  * Only on coherent architectures, we can mmap the status and the control records
3027  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3028  */
3029 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3030 /*
3031  * mmap status record
3032  */
3033 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3034                                                 struct vm_fault *vmf)
3035 {
3036         struct snd_pcm_substream *substream = area->vm_private_data;
3037         struct snd_pcm_runtime *runtime;
3038
3039         if (substream == NULL)
3040                 return VM_FAULT_SIGBUS;
3041         runtime = substream->runtime;
3042         vmf->page = virt_to_page(runtime->status);
3043         get_page(vmf->page);
3044         return 0;
3045 }
3046
3047 static struct vm_operations_struct snd_pcm_vm_ops_status =
3048 {
3049         .fault =        snd_pcm_mmap_status_fault,
3050 };
3051
3052 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3053                                struct vm_area_struct *area)
3054 {
3055         struct snd_pcm_runtime *runtime;
3056         long size;
3057         if (!(area->vm_flags & VM_READ))
3058                 return -EINVAL;
3059         runtime = substream->runtime;
3060         snd_assert(runtime != NULL, return -EAGAIN);
3061         size = area->vm_end - area->vm_start;
3062         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3063                 return -EINVAL;
3064         area->vm_ops = &snd_pcm_vm_ops_status;
3065         area->vm_private_data = substream;
3066         area->vm_flags |= VM_RESERVED;
3067         return 0;
3068 }
3069
3070 /*
3071  * mmap control record
3072  */
3073 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3074                                                 struct vm_fault *vmf)
3075 {
3076         struct snd_pcm_substream *substream = area->vm_private_data;
3077         struct snd_pcm_runtime *runtime;
3078
3079         if (substream == NULL)
3080                 return VM_FAULT_SIGBUS;
3081         runtime = substream->runtime;
3082         vmf->page = virt_to_page(runtime->control);
3083         get_page(vmf->page);
3084         return 0;
3085 }
3086
3087 static struct vm_operations_struct snd_pcm_vm_ops_control =
3088 {
3089         .fault =        snd_pcm_mmap_control_fault,
3090 };
3091
3092 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3093                                 struct vm_area_struct *area)
3094 {
3095         struct snd_pcm_runtime *runtime;
3096         long size;
3097         if (!(area->vm_flags & VM_READ))
3098                 return -EINVAL;
3099         runtime = substream->runtime;
3100         snd_assert(runtime != NULL, return -EAGAIN);
3101         size = area->vm_end - area->vm_start;
3102         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3103                 return -EINVAL;
3104         area->vm_ops = &snd_pcm_vm_ops_control;
3105         area->vm_private_data = substream;
3106         area->vm_flags |= VM_RESERVED;
3107         return 0;
3108 }
3109 #else /* ! coherent mmap */
3110 /*
3111  * don't support mmap for status and control records.
3112  */
3113 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3114                                struct vm_area_struct *area)
3115 {
3116         return -ENXIO;
3117 }
3118 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3119                                 struct vm_area_struct *area)
3120 {
3121         return -ENXIO;
3122 }
3123 #endif /* coherent mmap */
3124
3125 /*
3126  * fault callback for mmapping a RAM page
3127  */
3128 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3129                                                 struct vm_fault *vmf)
3130 {
3131         struct snd_pcm_substream *substream = area->vm_private_data;
3132         struct snd_pcm_runtime *runtime;
3133         unsigned long offset;
3134         struct page * page;
3135         void *vaddr;
3136         size_t dma_bytes;
3137
3138         if (substream == NULL)
3139                 return VM_FAULT_SIGBUS;
3140         runtime = substream->runtime;
3141         offset = vmf->pgoff << PAGE_SHIFT;
3142         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3143         if (offset > dma_bytes - PAGE_SIZE)
3144                 return VM_FAULT_SIGBUS;
3145         if (substream->ops->page) {
3146                 page = substream->ops->page(substream, offset);
3147                 if (!page)
3148                         return VM_FAULT_SIGBUS;
3149         } else {
3150                 vaddr = runtime->dma_area + offset;
3151                 page = virt_to_page(vaddr);
3152         }
3153         get_page(page);
3154         vmf->page = page;
3155         return 0;
3156 }
3157
3158 static struct vm_operations_struct snd_pcm_vm_ops_data =
3159 {
3160         .open =         snd_pcm_mmap_data_open,
3161         .close =        snd_pcm_mmap_data_close,
3162         .fault =        snd_pcm_mmap_data_fault,
3163 };
3164
3165 /*
3166  * mmap the DMA buffer on RAM
3167  */
3168 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3169                                 struct vm_area_struct *area)
3170 {
3171         area->vm_ops = &snd_pcm_vm_ops_data;
3172         area->vm_private_data = substream;
3173         area->vm_flags |= VM_RESERVED;
3174         atomic_inc(&substream->mmap_count);
3175         return 0;
3176 }
3177
3178 /*
3179  * mmap the DMA buffer on I/O memory area
3180  */
3181 #if SNDRV_PCM_INFO_MMAP_IOMEM
3182 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3183 {
3184         .open =         snd_pcm_mmap_data_open,
3185         .close =        snd_pcm_mmap_data_close,
3186 };
3187
3188 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3189                            struct vm_area_struct *area)
3190 {
3191         long size;
3192         unsigned long offset;
3193
3194 #ifdef pgprot_noncached
3195         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3196 #endif
3197         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3198         area->vm_private_data = substream;
3199         area->vm_flags |= VM_IO;
3200         size = area->vm_end - area->vm_start;
3201         offset = area->vm_pgoff << PAGE_SHIFT;
3202         if (io_remap_pfn_range(area, area->vm_start,
3203                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3204                                 size, area->vm_page_prot))
3205                 return -EAGAIN;
3206         atomic_inc(&substream->mmap_count);
3207         return 0;
3208 }
3209
3210 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3211 #endif /* SNDRV_PCM_INFO_MMAP */
3212
3213 /*
3214  * mmap DMA buffer
3215  */
3216 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3217                       struct vm_area_struct *area)
3218 {
3219         struct snd_pcm_runtime *runtime;
3220         long size;
3221         unsigned long offset;
3222         size_t dma_bytes;
3223
3224         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3225                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3226                         return -EINVAL;
3227         } else {
3228                 if (!(area->vm_flags & VM_READ))
3229                         return -EINVAL;
3230         }
3231         runtime = substream->runtime;
3232         snd_assert(runtime != NULL, return -EAGAIN);
3233         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3234                 return -EBADFD;
3235         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3236                 return -ENXIO;
3237         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3238             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3239                 return -EINVAL;
3240         size = area->vm_end - area->vm_start;
3241         offset = area->vm_pgoff << PAGE_SHIFT;
3242         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3243         if ((size_t)size > dma_bytes)
3244                 return -EINVAL;
3245         if (offset > dma_bytes - size)
3246                 return -EINVAL;
3247
3248         if (substream->ops->mmap)
3249                 return substream->ops->mmap(substream, area);
3250         else
3251                 return snd_pcm_default_mmap(substream, area);
3252 }
3253
3254 EXPORT_SYMBOL(snd_pcm_mmap_data);
3255
3256 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3257 {
3258         struct snd_pcm_file * pcm_file;
3259         struct snd_pcm_substream *substream;
3260         unsigned long offset;
3261
3262         pcm_file = file->private_data;
3263         substream = pcm_file->substream;
3264         snd_assert(substream != NULL, return -ENXIO);
3265
3266         offset = area->vm_pgoff << PAGE_SHIFT;
3267         switch (offset) {
3268         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3269                 if (pcm_file->no_compat_mmap)
3270                         return -ENXIO;
3271                 return snd_pcm_mmap_status(substream, file, area);
3272         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3273                 if (pcm_file->no_compat_mmap)
3274                         return -ENXIO;
3275                 return snd_pcm_mmap_control(substream, file, area);
3276         default:
3277                 return snd_pcm_mmap_data(substream, file, area);
3278         }
3279         return 0;
3280 }
3281
3282 static int snd_pcm_fasync(int fd, struct file * file, int on)
3283 {
3284         struct snd_pcm_file * pcm_file;
3285         struct snd_pcm_substream *substream;
3286         struct snd_pcm_runtime *runtime;
3287         int err;
3288
3289         pcm_file = file->private_data;
3290         substream = pcm_file->substream;
3291         snd_assert(substream != NULL, return -ENXIO);
3292         runtime = substream->runtime;
3293
3294         err = fasync_helper(fd, file, on, &runtime->fasync);
3295         if (err < 0)
3296                 return err;
3297         return 0;
3298 }
3299
3300 /*
3301  * ioctl32 compat
3302  */
3303 #ifdef CONFIG_COMPAT
3304 #include "pcm_compat.c"
3305 #else
3306 #define snd_pcm_ioctl_compat    NULL
3307 #endif
3308
3309 /*
3310  *  To be removed helpers to keep binary compatibility
3311  */
3312
3313 #ifdef CONFIG_SND_SUPPORT_OLD_API
3314 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3315 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3316
3317 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3318                                                struct snd_pcm_hw_params_old *oparams)
3319 {
3320         unsigned int i;
3321
3322         memset(params, 0, sizeof(*params));
3323         params->flags = oparams->flags;
3324         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3325                 params->masks[i].bits[0] = oparams->masks[i];
3326         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3327         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3328         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3329         params->info = oparams->info;
3330         params->msbits = oparams->msbits;
3331         params->rate_num = oparams->rate_num;
3332         params->rate_den = oparams->rate_den;
3333         params->fifo_size = oparams->fifo_size;
3334 }
3335
3336 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3337                                              struct snd_pcm_hw_params *params)
3338 {
3339         unsigned int i;
3340
3341         memset(oparams, 0, sizeof(*oparams));
3342         oparams->flags = params->flags;
3343         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3344                 oparams->masks[i] = params->masks[i].bits[0];
3345         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3346         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3347         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3348         oparams->info = params->info;
3349         oparams->msbits = params->msbits;
3350         oparams->rate_num = params->rate_num;
3351         oparams->rate_den = params->rate_den;
3352         oparams->fifo_size = params->fifo_size;
3353 }
3354
3355 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3356                                       struct snd_pcm_hw_params_old __user * _oparams)
3357 {
3358         struct snd_pcm_hw_params *params;
3359         struct snd_pcm_hw_params_old *oparams = NULL;
3360         int err;
3361
3362         params = kmalloc(sizeof(*params), GFP_KERNEL);
3363         if (!params) {
3364                 err = -ENOMEM;
3365                 goto out;
3366         }
3367         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3368         if (!oparams) {
3369                 err = -ENOMEM;
3370                 goto out;
3371         }
3372
3373         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3374                 err = -EFAULT;
3375                 goto out;
3376         }
3377         snd_pcm_hw_convert_from_old_params(params, oparams);
3378         err = snd_pcm_hw_refine(substream, params);
3379         snd_pcm_hw_convert_to_old_params(oparams, params);
3380         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3381                 if (!err)
3382                         err = -EFAULT;
3383         }
3384 out:
3385         kfree(params);
3386         kfree(oparams);
3387         return err;
3388 }
3389
3390 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3391                                       struct snd_pcm_hw_params_old __user * _oparams)
3392 {
3393         struct snd_pcm_hw_params *params;
3394         struct snd_pcm_hw_params_old *oparams = NULL;
3395         int err;
3396
3397         params = kmalloc(sizeof(*params), GFP_KERNEL);
3398         if (!params) {
3399                 err = -ENOMEM;
3400                 goto out;
3401         }
3402         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3403         if (!oparams) {
3404                 err = -ENOMEM;
3405                 goto out;
3406         }
3407         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3408                 err = -EFAULT;
3409                 goto out;
3410         }
3411         snd_pcm_hw_convert_from_old_params(params, oparams);
3412         err = snd_pcm_hw_params(substream, params);
3413         snd_pcm_hw_convert_to_old_params(oparams, params);
3414         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3415                 if (!err)
3416                         err = -EFAULT;
3417         }
3418 out:
3419         kfree(params);
3420         kfree(oparams);
3421         return err;
3422 }
3423 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3424
3425 /*
3426  *  Register section
3427  */
3428
3429 const struct file_operations snd_pcm_f_ops[2] = {
3430         {
3431                 .owner =                THIS_MODULE,
3432                 .write =                snd_pcm_write,
3433                 .aio_write =            snd_pcm_aio_write,
3434                 .open =                 snd_pcm_playback_open,
3435                 .release =              snd_pcm_release,
3436                 .poll =                 snd_pcm_playback_poll,
3437                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3438                 .compat_ioctl =         snd_pcm_ioctl_compat,
3439                 .mmap =                 snd_pcm_mmap,
3440                 .fasync =               snd_pcm_fasync,
3441         },
3442         {
3443                 .owner =                THIS_MODULE,
3444                 .read =                 snd_pcm_read,
3445                 .aio_read =             snd_pcm_aio_read,
3446                 .open =                 snd_pcm_capture_open,
3447                 .release =              snd_pcm_release,
3448                 .poll =                 snd_pcm_capture_poll,
3449                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3450                 .compat_ioctl =         snd_pcm_ioctl_compat,
3451                 .mmap =                 snd_pcm_mmap,
3452                 .fasync =               snd_pcm_fasync,
3453         }
3454 };