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@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/mm.h>
  24 #include <linux/file.h>
  25 #include <linux/slab.h>
  26 #include <linux/time.h>
  27 #include <linux/latency.h>
  28 #include <linux/uio.h>
  29 #include <sound/core.h>
  30 #include <sound/control.h>
  31 #include <sound/info.h>
  32 #include <sound/pcm.h>
  33 #include <sound/pcm_params.h>
  34 #include <sound/timer.h>
  35 #include <sound/minors.h>
  36 #include <asm/io.h>
  37
  38 /*
  39  *  Compatibility
  40  */
  41
  42 struct snd_pcm_hw_params_old {
  43         unsigned int flags;
  44         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  45                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  46         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  47                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  48         unsigned int rmask;
  49         unsigned int cmask;
  50         unsigned int info;
  51         unsigned int msbits;
  52         unsigned int rate_num;
  53         unsigned int rate_den;
  54         snd_pcm_uframes_t fifo_size;
  55         unsigned char reserved[64];
  56 };
  57
  58 #ifdef CONFIG_SND_SUPPORT_OLD_API
  59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  61
  62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  63                                       struct snd_pcm_hw_params_old __user * _oparams);
  64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 #endif
  67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  68
  69 /*
  70  *
  71  */
  72
  73 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  74 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  75
  76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  77
  78 static inline mm_segment_t snd_enter_user(void)
  79 {
  80         mm_segment_t fs = get_fs();
  81         set_fs(get_ds());
  82         return fs;
  83 }
  84
  85 static inline void snd_leave_user(mm_segment_t fs)
  86 {
  87         set_fs(fs);
  88 }
  89
  90
  91
  92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  93 {
  94         struct snd_pcm_runtime *runtime;
  95         struct snd_pcm *pcm = substream->pcm;
  96         struct snd_pcm_str *pstr = substream->pstr;
  97
  98         snd_assert(substream != NULL, return -ENXIO);
  99         memset(info, 0, sizeof(*info));
 100         info->card = pcm->card->number;
 101         info->device = pcm->device;
 102         info->stream = substream->stream;
 103         info->subdevice = substream->number;
 104         strlcpy(info->id, pcm->id, sizeof(info->id));
 105         strlcpy(info->name, pcm->name, sizeof(info->name));
 106         info->dev_class = pcm->dev_class;
 107         info->dev_subclass = pcm->dev_subclass;
 108         info->subdevices_count = pstr->substream_count;
 109         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 110         strlcpy(info->subname, substream->name, sizeof(info->subname));
 111         runtime = substream->runtime;
 112         /* AB: FIXME!!! This is definitely nonsense */
 113         if (runtime) {
 114                 info->sync = runtime->sync;
 115                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 116         }
 117         return 0;
 118 }
 119
 120 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 121                       struct snd_pcm_info __user * _info)
 122 {
 123         struct snd_pcm_info *info;
 124         int err;
 125
 126         info = kmalloc(sizeof(*info), GFP_KERNEL);
 127         if (! info)
 128                 return -ENOMEM;
 129         err = snd_pcm_info(substream, info);
 130         if (err >= 0) {
 131                 if (copy_to_user(_info, info, sizeof(*info)))
 132                         err = -EFAULT;
 133         }
 134         kfree(info);
 135         return err;
 136 }
 137
 138 #undef RULES_DEBUG
 139
 140 #ifdef RULES_DEBUG
 141 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 142 char *snd_pcm_hw_param_names[] = {
 143         HW_PARAM(ACCESS),
 144         HW_PARAM(FORMAT),
 145         HW_PARAM(SUBFORMAT),
 146         HW_PARAM(SAMPLE_BITS),
 147         HW_PARAM(FRAME_BITS),
 148         HW_PARAM(CHANNELS),
 149         HW_PARAM(RATE),
 150         HW_PARAM(PERIOD_TIME),
 151         HW_PARAM(PERIOD_SIZE),
 152         HW_PARAM(PERIOD_BYTES),
 153         HW_PARAM(PERIODS),
 154         HW_PARAM(BUFFER_TIME),
 155         HW_PARAM(BUFFER_SIZE),
 156         HW_PARAM(BUFFER_BYTES),
 157         HW_PARAM(TICK_TIME),
 158 };
 159 #endif
 160
 161 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 162                       struct snd_pcm_hw_params *params)
 163 {
 164         unsigned int k;
 165         struct snd_pcm_hardware *hw;
 166         struct snd_interval *i = NULL;
 167         struct snd_mask *m = NULL;
 168         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 169         unsigned int rstamps[constrs->rules_num];
 170         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 171         unsigned int stamp = 2;
 172         int changed, again;
 173
 174         params->info = 0;
 175         params->fifo_size = 0;
 176         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 177                 params->msbits = 0;
 178         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 179                 params->rate_num = 0;
 180                 params->rate_den = 0;
 181         }
 182
 183         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 184                 m = hw_param_mask(params, k);
 185                 if (snd_mask_empty(m))
 186                         return -EINVAL;
 187                 if (!(params->rmask & (1 << k)))
 188                         continue;
 189 #ifdef RULES_DEBUG
 190                 printk("%s = ", snd_pcm_hw_param_names[k]);
 191                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 192 #endif
 193                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 194 #ifdef RULES_DEBUG
 195                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 196 #endif
 197                 if (changed)
 198                         params->cmask |= 1 << k;
 199                 if (changed < 0)
 200                         return changed;
 201         }
 202
 203         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 204                 i = hw_param_interval(params, k);
 205                 if (snd_interval_empty(i))
 206                         return -EINVAL;
 207                 if (!(params->rmask & (1 << k)))
 208                         continue;
 209 #ifdef RULES_DEBUG
 210                 printk("%s = ", snd_pcm_hw_param_names[k]);
 211                 if (i->empty)
 212                         printk("empty");
 213                 else
 214                         printk("%c%u %u%c",
 215                                i->openmin ? '(' : '[', i->min,
 216                                i->max, i->openmax ? ')' : ']');
 217                 printk(" -> ");
 218 #endif
 219                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 220 #ifdef RULES_DEBUG
 221                 if (i->empty)
 222                         printk("empty\n");
 223                 else
 224                         printk("%c%u %u%c\n",
 225                                i->openmin ? '(' : '[', i->min,
 226                                i->max, i->openmax ? ')' : ']');
 227 #endif
 228                 if (changed)
 229                         params->cmask |= 1 << k;
 230                 if (changed < 0)
 231                         return changed;
 232         }
 233
 234         for (k = 0; k < constrs->rules_num; k++)
 235                 rstamps[k] = 0;
 236         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 237                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 238         do {
 239                 again = 0;
 240                 for (k = 0; k < constrs->rules_num; k++) {
 241                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 242                         unsigned int d;
 243                         int doit = 0;
 244                         if (r->cond && !(r->cond & params->flags))
 245                                 continue;
 246                         for (d = 0; r->deps[d] >= 0; d++) {
 247                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 248                                         doit = 1;
 249                                         break;
 250                                 }
 251                         }
 252                         if (!doit)
 253                                 continue;
 254 #ifdef RULES_DEBUG
 255                         printk("Rule %d [%p]: ", k, r->func);
 256                         if (r->var >= 0) {
 257                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 258                                 if (hw_is_mask(r->var)) {
 259                                         m = hw_param_mask(params, r->var);
 260                                         printk("%x", *m->bits);
 261                                 } else {
 262                                         i = hw_param_interval(params, r->var);
 263                                         if (i->empty)
 264                                                 printk("empty");
 265                                         else
 266                                                 printk("%c%u %u%c",
 267                                                        i->openmin ? '(' : '[', i->min,
 268                                                        i->max, i->openmax ? ')' : ']');
 269                                 }
 270                         }
 271 #endif
 272                         changed = r->func(params, r);
 273 #ifdef RULES_DEBUG
 274                         if (r->var >= 0) {
 275                                 printk(" -> ");
 276                                 if (hw_is_mask(r->var))
 277                                         printk("%x", *m->bits);
 278                                 else {
 279                                         if (i->empty)
 280                                                 printk("empty");
 281                                         else
 282                                                 printk("%c%u %u%c",
 283                                                        i->openmin ? '(' : '[', i->min,
 284                                                        i->max, i->openmax ? ')' : ']');
 285                                 }
 286                         }
 287                         printk("\n");
 288 #endif
 289                         rstamps[k] = stamp;
 290                         if (changed && r->var >= 0) {
 291                                 params->cmask |= (1 << r->var);
 292                                 vstamps[r->var] = stamp;
 293                                 again = 1;
 294                         }
 295                         if (changed < 0)
 296                                 return changed;
 297                         stamp++;
 298                 }
 299         } while (again);
 300         if (!params->msbits) {
 301                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 302                 if (snd_interval_single(i))
 303                         params->msbits = snd_interval_value(i);
 304         }
 305
 306         if (!params->rate_den) {
 307                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 308                 if (snd_interval_single(i)) {
 309                         params->rate_num = snd_interval_value(i);
 310                         params->rate_den = 1;
 311                 }
 312         }
 313
 314         hw = &substream->runtime->hw;
 315         if (!params->info)
 316                 params->info = hw->info;
 317         if (!params->fifo_size)
 318                 params->fifo_size = hw->fifo_size;
 319         params->rmask = 0;
 320         return 0;
 321 }
 322
 323 EXPORT_SYMBOL(snd_pcm_hw_refine);
 324
 325 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 326                                   struct snd_pcm_hw_params __user * _params)
 327 {
 328         struct snd_pcm_hw_params *params;
 329         int err;
 330
 331         params = kmalloc(sizeof(*params), GFP_KERNEL);
 332         if (!params) {
 333                 err = -ENOMEM;
 334                 goto out;
 335         }
 336         if (copy_from_user(params, _params, sizeof(*params))) {
 337                 err = -EFAULT;
 338                 goto out;
 339         }
 340         err = snd_pcm_hw_refine(substream, params);
 341         if (copy_to_user(_params, params, sizeof(*params))) {
 342                 if (!err)
 343                         err = -EFAULT;
 344         }
 345 out:
 346         kfree(params);
 347         return err;
 348 }
 349
 350 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 351 {
 352         int usecs;
 353
 354         if (! runtime->rate)
 355                 return -1; /* invalid */
 356
 357         /* take 75% of period time as the deadline */
 358         usecs = (750000 / runtime->rate) * runtime->period_size;
 359         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 360                 runtime->rate;
 361
 362         return usecs;
 363 }
 364
 365 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 366                              struct snd_pcm_hw_params *params)
 367 {
 368         struct snd_pcm_runtime *runtime;
 369         int err, usecs;
 370         unsigned int bits;
 371         snd_pcm_uframes_t frames;
 372
 373         snd_assert(substream != NULL, return -ENXIO);
 374         runtime = substream->runtime;
 375         snd_assert(runtime != NULL, return -ENXIO);
 376         snd_pcm_stream_lock_irq(substream);
 377         switch (runtime->status->state) {
 378         case SNDRV_PCM_STATE_OPEN:
 379         case SNDRV_PCM_STATE_SETUP:
 380         case SNDRV_PCM_STATE_PREPARED:
 381                 break;
 382         default:
 383                 snd_pcm_stream_unlock_irq(substream);
 384                 return -EBADFD;
 385         }
 386         snd_pcm_stream_unlock_irq(substream);
 387 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 388         if (!substream->oss.oss)
 389 #endif
 390                 if (atomic_read(&substream->mmap_count))
 391                         return -EBADFD;
 392
 393         params->rmask = ~0U;
 394         err = snd_pcm_hw_refine(substream, params);
 395         if (err < 0)
 396                 goto _error;
 397
 398         err = snd_pcm_hw_params_choose(substream, params);
 399         if (err < 0)
 400                 goto _error;
 401
 402         if (substream->ops->hw_params != NULL) {
 403                 err = substream->ops->hw_params(substream, params);
 404                 if (err < 0)
 405                         goto _error;
 406         }
 407
 408         runtime->access = params_access(params);
 409         runtime->format = params_format(params);
 410         runtime->subformat = params_subformat(params);
 411         runtime->channels = params_channels(params);
 412         runtime->rate = params_rate(params);
 413         runtime->period_size = params_period_size(params);
 414         runtime->periods = params_periods(params);
 415         runtime->buffer_size = params_buffer_size(params);
 416         runtime->tick_time = params_tick_time(params);
 417         runtime->info = params->info;
 418         runtime->rate_num = params->rate_num;
 419         runtime->rate_den = params->rate_den;
 420
 421         bits = snd_pcm_format_physical_width(runtime->format);
 422         runtime->sample_bits = bits;
 423         bits *= runtime->channels;
 424         runtime->frame_bits = bits;
 425         frames = 1;
 426         while (bits % 8 != 0) {
 427                 bits *= 2;
 428                 frames *= 2;
 429         }
 430         runtime->byte_align = bits / 8;
 431         runtime->min_align = frames;
 432
 433         /* Default sw params */
 434         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 435         runtime->period_step = 1;
 436         runtime->sleep_min = 0;
 437         runtime->control->avail_min = runtime->period_size;
 438         runtime->xfer_align = runtime->period_size;
 439         runtime->start_threshold = 1;
 440         runtime->stop_threshold = runtime->buffer_size;
 441         runtime->silence_threshold = 0;
 442         runtime->silence_size = 0;
 443         runtime->boundary = runtime->buffer_size;
 444         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 445                 runtime->boundary *= 2;
 446
 447         snd_pcm_timer_resolution_change(substream);
 448         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 449
 450         remove_acceptable_latency(substream->latency_id);
 451         if ((usecs = period_to_usecs(runtime)) >= 0)
 452                 set_acceptable_latency(substream->latency_id, usecs);
 453         return 0;
 454  _error:
 455         /* hardware might be unuseable from this time,
 456            so we force application to retry to set
 457            the correct hardware parameter settings */
 458         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 459         if (substream->ops->hw_free != NULL)
 460                 substream->ops->hw_free(substream);
 461         return err;
 462 }
 463
 464 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 465                                   struct snd_pcm_hw_params __user * _params)
 466 {
 467         struct snd_pcm_hw_params *params;
 468         int err;
 469
 470         params = kmalloc(sizeof(*params), GFP_KERNEL);
 471         if (!params) {
 472                 err = -ENOMEM;
 473                 goto out;
 474         }
 475         if (copy_from_user(params, _params, sizeof(*params))) {
 476                 err = -EFAULT;
 477                 goto out;
 478         }
 479         err = snd_pcm_hw_params(substream, params);
 480         if (copy_to_user(_params, params, sizeof(*params))) {
 481                 if (!err)
 482                         err = -EFAULT;
 483         }
 484 out:
 485         kfree(params);
 486         return err;
 487 }
 488
 489 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 490 {
 491         struct snd_pcm_runtime *runtime;
 492         int result = 0;
 493
 494         snd_assert(substream != NULL, return -ENXIO);
 495         runtime = substream->runtime;
 496         snd_assert(runtime != NULL, return -ENXIO);
 497         snd_pcm_stream_lock_irq(substream);
 498         switch (runtime->status->state) {
 499         case SNDRV_PCM_STATE_SETUP:
 500         case SNDRV_PCM_STATE_PREPARED:
 501                 break;
 502         default:
 503                 snd_pcm_stream_unlock_irq(substream);
 504                 return -EBADFD;
 505         }
 506         snd_pcm_stream_unlock_irq(substream);
 507         if (atomic_read(&substream->mmap_count))
 508                 return -EBADFD;
 509         if (substream->ops->hw_free)
 510                 result = substream->ops->hw_free(substream);
 511         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 512         remove_acceptable_latency(substream->latency_id);
 513         return result;
 514 }
 515
 516 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 517                              struct snd_pcm_sw_params *params)
 518 {
 519         struct snd_pcm_runtime *runtime;
 520
 521         snd_assert(substream != NULL, return -ENXIO);
 522         runtime = substream->runtime;
 523         snd_assert(runtime != NULL, return -ENXIO);
 524         snd_pcm_stream_lock_irq(substream);
 525         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 526                 snd_pcm_stream_unlock_irq(substream);
 527                 return -EBADFD;
 528         }
 529         snd_pcm_stream_unlock_irq(substream);
 530
 531         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 532                 return -EINVAL;
 533         if (params->avail_min == 0)
 534                 return -EINVAL;
 535         if (params->xfer_align == 0 ||
 536             params->xfer_align % runtime->min_align != 0)
 537                 return -EINVAL;
 538         if (params->silence_size >= runtime->boundary) {
 539                 if (params->silence_threshold != 0)
 540                         return -EINVAL;
 541         } else {
 542                 if (params->silence_size > params->silence_threshold)
 543                         return -EINVAL;
 544                 if (params->silence_threshold > runtime->buffer_size)
 545                         return -EINVAL;
 546         }
 547         snd_pcm_stream_lock_irq(substream);
 548         runtime->tstamp_mode = params->tstamp_mode;
 549         runtime->sleep_min = params->sleep_min;
 550         runtime->period_step = params->period_step;
 551         runtime->control->avail_min = params->avail_min;
 552         runtime->start_threshold = params->start_threshold;
 553         runtime->stop_threshold = params->stop_threshold;
 554         runtime->silence_threshold = params->silence_threshold;
 555         runtime->silence_size = params->silence_size;
 556         runtime->xfer_align = params->xfer_align;
 557         params->boundary = runtime->boundary;
 558         if (snd_pcm_running(substream)) {
 559                 if (runtime->sleep_min)
 560                         snd_pcm_tick_prepare(substream);
 561                 else
 562                         snd_pcm_tick_set(substream, 0);
 563                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 564                     runtime->silence_size > 0)
 565                         snd_pcm_playback_silence(substream, ULONG_MAX);
 566                 wake_up(&runtime->sleep);
 567         }
 568         snd_pcm_stream_unlock_irq(substream);
 569         return 0;
 570 }
 571
 572 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 573                                   struct snd_pcm_sw_params __user * _params)
 574 {
 575         struct snd_pcm_sw_params params;
 576         int err;
 577         if (copy_from_user(&params, _params, sizeof(params)))
 578                 return -EFAULT;
 579         err = snd_pcm_sw_params(substream, &params);
 580         if (copy_to_user(_params, &params, sizeof(params)))
 581                 return -EFAULT;
 582         return err;
 583 }
 584
 585 int snd_pcm_status(struct snd_pcm_substream *substream,
 586                    struct snd_pcm_status *status)
 587 {
 588         struct snd_pcm_runtime *runtime = substream->runtime;
 589
 590         snd_pcm_stream_lock_irq(substream);
 591         status->state = runtime->status->state;
 592         status->suspended_state = runtime->status->suspended_state;
 593         if (status->state == SNDRV_PCM_STATE_OPEN)
 594                 goto _end;
 595         status->trigger_tstamp = runtime->trigger_tstamp;
 596         if (snd_pcm_running(substream)) {
 597                 snd_pcm_update_hw_ptr(substream);
 598                 if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
 599                         status->tstamp = runtime->status->tstamp;
 600                 else
 601                         getnstimeofday(&status->tstamp);
 602         } else
 603                 getnstimeofday(&status->tstamp);
 604         status->appl_ptr = runtime->control->appl_ptr;
 605         status->hw_ptr = runtime->status->hw_ptr;
 606         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 607                 status->avail = snd_pcm_playback_avail(runtime);
 608                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 609                     runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 610                         status->delay = runtime->buffer_size - status->avail;
 611                 else
 612                         status->delay = 0;
 613         } else {
 614                 status->avail = snd_pcm_capture_avail(runtime);
 615                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 616                         status->delay = status->avail;
 617                 else
 618                         status->delay = 0;
 619         }
 620         status->avail_max = runtime->avail_max;
 621         status->overrange = runtime->overrange;
 622         runtime->avail_max = 0;
 623         runtime->overrange = 0;
 624  _end:
 625         snd_pcm_stream_unlock_irq(substream);
 626         return 0;
 627 }
 628
 629 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 630                                struct snd_pcm_status __user * _status)
 631 {
 632         struct snd_pcm_status status;
 633         struct snd_pcm_runtime *runtime;
 634         int res;
 635
 636         snd_assert(substream != NULL, return -ENXIO);
 637         runtime = substream->runtime;
 638         memset(&status, 0, sizeof(status));
 639         res = snd_pcm_status(substream, &status);
 640         if (res < 0)
 641                 return res;
 642         if (copy_to_user(_status, &status, sizeof(status)))
 643                 return -EFAULT;
 644         return 0;
 645 }
 646
 647 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 648                                 struct snd_pcm_channel_info * info)
 649 {
 650         struct snd_pcm_runtime *runtime;
 651         unsigned int channel;
 652
 653         snd_assert(substream != NULL, return -ENXIO);
 654         channel = info->channel;
 655         runtime = substream->runtime;
 656         snd_pcm_stream_lock_irq(substream);
 657         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 658                 snd_pcm_stream_unlock_irq(substream);
 659                 return -EBADFD;
 660         }
 661         snd_pcm_stream_unlock_irq(substream);
 662         if (channel >= runtime->channels)
 663                 return -EINVAL;
 664         memset(info, 0, sizeof(*info));
 665         info->channel = channel;
 666         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 667 }
 668
 669 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 670                                      struct snd_pcm_channel_info __user * _info)
 671 {
 672         struct snd_pcm_channel_info info;
 673         int res;
 674
 675         if (copy_from_user(&info, _info, sizeof(info)))
 676                 return -EFAULT;
 677         res = snd_pcm_channel_info(substream, &info);
 678         if (res < 0)
 679                 return res;
 680         if (copy_to_user(_info, &info, sizeof(info)))
 681                 return -EFAULT;
 682         return 0;
 683 }
 684
 685 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 686 {
 687         struct snd_pcm_runtime *runtime = substream->runtime;
 688         if (runtime->trigger_master == NULL)
 689                 return;
 690         if (runtime->trigger_master == substream) {
 691                 getnstimeofday(&runtime->trigger_tstamp);
 692         } else {
 693                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 694                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 695         }
 696         runtime->trigger_master = NULL;
 697 }
 698
 699 struct action_ops {
 700         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 701         int (*do_action)(struct snd_pcm_substream *substream, int state);
 702         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 703         void (*post_action)(struct snd_pcm_substream *substream, int state);
 704 };
 705
 706 /*
 707  *  this functions is core for handling of linked stream
 708  *  Note: the stream state might be changed also on failure
 709  *  Note2: call with calling stream lock + link lock
 710  */
 711 static int snd_pcm_action_group(struct action_ops *ops,
 712                                 struct snd_pcm_substream *substream,
 713                                 int state, int do_lock)
 714 {
 715         struct snd_pcm_substream *s = NULL;
 716         struct snd_pcm_substream *s1;
 717         int res = 0;
 718
 719         snd_pcm_group_for_each_entry(s, substream) {
 720                 if (do_lock && s != substream)
 721                         spin_lock(&s->self_group.lock);
 722                 res = ops->pre_action(s, state);
 723                 if (res < 0)
 724                         goto _unlock;
 725         }
 726         snd_pcm_group_for_each_entry(s, substream) {
 727                 res = ops->do_action(s, state);
 728                 if (res < 0) {
 729                         if (ops->undo_action) {
 730                                 snd_pcm_group_for_each_entry(s1, substream) {
 731                                         if (s1 == s) /* failed stream */
 732                                                 break;
 733                                         ops->undo_action(s1, state);
 734                                 }
 735                         }
 736                         s = NULL; /* unlock all */
 737                         goto _unlock;
 738                 }
 739         }
 740         snd_pcm_group_for_each_entry(s, substream) {
 741                 ops->post_action(s, state);
 742         }
 743  _unlock:
 744         if (do_lock) {
 745                 /* unlock streams */
 746                 snd_pcm_group_for_each_entry(s1, substream) {
 747                         if (s1 != substream)
 748                                 spin_unlock(&s1->self_group.lock);
 749                         if (s1 == s)    /* end */
 750                                 break;
 751                 }
 752         }
 753         return res;
 754 }
 755
 756 /*
 757  *  Note: call with stream lock
 758  */
 759 static int snd_pcm_action_single(struct action_ops *ops,
 760                                  struct snd_pcm_substream *substream,
 761                                  int state)
 762 {
 763         int res;
 764
 765         res = ops->pre_action(substream, state);
 766         if (res < 0)
 767                 return res;
 768         res = ops->do_action(substream, state);
 769         if (res == 0)
 770                 ops->post_action(substream, state);
 771         else if (ops->undo_action)
 772                 ops->undo_action(substream, state);
 773         return res;
 774 }
 775
 776 /*
 777  *  Note: call with stream lock
 778  */
 779 static int snd_pcm_action(struct action_ops *ops,
 780                           struct snd_pcm_substream *substream,
 781                           int state)
 782 {
 783         int res;
 784
 785         if (snd_pcm_stream_linked(substream)) {
 786                 if (!spin_trylock(&substream->group->lock)) {
 787                         spin_unlock(&substream->self_group.lock);
 788                         spin_lock(&substream->group->lock);
 789                         spin_lock(&substream->self_group.lock);
 790                 }
 791                 res = snd_pcm_action_group(ops, substream, state, 1);
 792                 spin_unlock(&substream->group->lock);
 793         } else {
 794                 res = snd_pcm_action_single(ops, substream, state);
 795         }
 796         return res;
 797 }
 798
 799 /*
 800  *  Note: don't use any locks before
 801  */
 802 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 803                                    struct snd_pcm_substream *substream,
 804                                    int state)
 805 {
 806         int res;
 807
 808         read_lock_irq(&snd_pcm_link_rwlock);
 809         if (snd_pcm_stream_linked(substream)) {
 810                 spin_lock(&substream->group->lock);
 811                 spin_lock(&substream->self_group.lock);
 812                 res = snd_pcm_action_group(ops, substream, state, 1);
 813                 spin_unlock(&substream->self_group.lock);
 814                 spin_unlock(&substream->group->lock);
 815         } else {
 816                 spin_lock(&substream->self_group.lock);
 817                 res = snd_pcm_action_single(ops, substream, state);
 818                 spin_unlock(&substream->self_group.lock);
 819         }
 820         read_unlock_irq(&snd_pcm_link_rwlock);
 821         return res;
 822 }
 823
 824 /*
 825  */
 826 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 827                                     struct snd_pcm_substream *substream,
 828                                     int state)
 829 {
 830         int res;
 831
 832         down_read(&snd_pcm_link_rwsem);
 833         if (snd_pcm_stream_linked(substream))
 834                 res = snd_pcm_action_group(ops, substream, state, 0);
 835         else
 836                 res = snd_pcm_action_single(ops, substream, state);
 837         up_read(&snd_pcm_link_rwsem);
 838         return res;
 839 }
 840
 841 /*
 842  * start callbacks
 843  */
 844 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 845 {
 846         struct snd_pcm_runtime *runtime = substream->runtime;
 847         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 848                 return -EBADFD;
 849         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 850             !snd_pcm_playback_data(substream))
 851                 return -EPIPE;
 852         runtime->trigger_master = substream;
 853         return 0;
 854 }
 855
 856 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 857 {
 858         if (substream->runtime->trigger_master != substream)
 859                 return 0;
 860         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 861 }
 862
 863 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 864 {
 865         if (substream->runtime->trigger_master == substream)
 866                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 867 }
 868
 869 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 870 {
 871         struct snd_pcm_runtime *runtime = substream->runtime;
 872         snd_pcm_trigger_tstamp(substream);
 873         runtime->status->state = state;
 874         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 875             runtime->silence_size > 0)
 876                 snd_pcm_playback_silence(substream, ULONG_MAX);
 877         if (runtime->sleep_min)
 878                 snd_pcm_tick_prepare(substream);
 879         if (substream->timer)
 880                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 881                                  &runtime->trigger_tstamp);
 882 }
 883
 884 static struct action_ops snd_pcm_action_start = {
 885         .pre_action = snd_pcm_pre_start,
 886         .do_action = snd_pcm_do_start,
 887         .undo_action = snd_pcm_undo_start,
 888         .post_action = snd_pcm_post_start
 889 };
 890
 891 /**
 892  * snd_pcm_start
 893  * @substream: the PCM substream instance
 894  *
 895  * Start all linked streams.
 896  */
 897 int snd_pcm_start(struct snd_pcm_substream *substream)
 898 {
 899         return snd_pcm_action(&snd_pcm_action_start, substream,
 900                               SNDRV_PCM_STATE_RUNNING);
 901 }
 902
 903 /*
 904  * stop callbacks
 905  */
 906 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 907 {
 908         struct snd_pcm_runtime *runtime = substream->runtime;
 909         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 910                 return -EBADFD;
 911         runtime->trigger_master = substream;
 912         return 0;
 913 }
 914
 915 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 916 {
 917         if (substream->runtime->trigger_master == substream &&
 918             snd_pcm_running(substream))
 919                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 920         return 0; /* unconditonally stop all substreams */
 921 }
 922
 923 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 924 {
 925         struct snd_pcm_runtime *runtime = substream->runtime;
 926         if (runtime->status->state != state) {
 927                 snd_pcm_trigger_tstamp(substream);
 928                 if (substream->timer)
 929                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 930                                          &runtime->trigger_tstamp);
 931                 runtime->status->state = state;
 932                 snd_pcm_tick_set(substream, 0);
 933         }
 934         wake_up(&runtime->sleep);
 935 }
 936
 937 static struct action_ops snd_pcm_action_stop = {
 938         .pre_action = snd_pcm_pre_stop,
 939         .do_action = snd_pcm_do_stop,
 940         .post_action = snd_pcm_post_stop
 941 };
 942
 943 /**
 944  * snd_pcm_stop
 945  * @substream: the PCM substream instance
 946  * @state: PCM state after stopping the stream
 947  *
 948  * Try to stop all running streams in the substream group.
 949  * The state of each stream is changed to the given value after that unconditionally.
 950  */
 951 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 952 {
 953         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 954 }
 955
 956 EXPORT_SYMBOL(snd_pcm_stop);
 957
 958 /**
 959  * snd_pcm_drain_done
 960  * @substream: the PCM substream
 961  *
 962  * Stop the DMA only when the given stream is playback.
 963  * The state is changed to SETUP.
 964  * Unlike snd_pcm_stop(), this affects only the given stream.
 965  */
 966 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 967 {
 968         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 969                                      SNDRV_PCM_STATE_SETUP);
 970 }
 971
 972 /*
 973  * pause callbacks
 974  */
 975 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 976 {
 977         struct snd_pcm_runtime *runtime = substream->runtime;
 978         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 979                 return -ENOSYS;
 980         if (push) {
 981                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 982                         return -EBADFD;
 983         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 984                 return -EBADFD;
 985         runtime->trigger_master = substream;
 986         return 0;
 987 }
 988
 989 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 990 {
 991         if (substream->runtime->trigger_master != substream)
 992                 return 0;
 993         return substream->ops->trigger(substream,
 994                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 995                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 996 }
 997
 998 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 999 {
1000         if (substream->runtime->trigger_master == substream)
1001                 substream->ops->trigger(substream,
1002                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1003                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1004 }
1005
1006 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1007 {
1008         struct snd_pcm_runtime *runtime = substream->runtime;
1009         snd_pcm_trigger_tstamp(substream);
1010         if (push) {
1011                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1012                 if (substream->timer)
1013                         snd_timer_notify(substream->timer,
1014                                          SNDRV_TIMER_EVENT_MPAUSE,
1015                                          &runtime->trigger_tstamp);
1016                 snd_pcm_tick_set(substream, 0);
1017                 wake_up(&runtime->sleep);
1018         } else {
1019                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1020                 if (runtime->sleep_min)
1021                         snd_pcm_tick_prepare(substream);
1022                 if (substream->timer)
1023                         snd_timer_notify(substream->timer,
1024                                          SNDRV_TIMER_EVENT_MCONTINUE,
1025                                          &runtime->trigger_tstamp);
1026         }
1027 }
1028
1029 static struct action_ops snd_pcm_action_pause = {
1030         .pre_action = snd_pcm_pre_pause,
1031         .do_action = snd_pcm_do_pause,
1032         .undo_action = snd_pcm_undo_pause,
1033         .post_action = snd_pcm_post_pause
1034 };
1035
1036 /*
1037  * Push/release the pause for all linked streams.
1038  */
1039 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1040 {
1041         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1042 }
1043
1044 #ifdef CONFIG_PM
1045 /* suspend */
1046
1047 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1048 {
1049         struct snd_pcm_runtime *runtime = substream->runtime;
1050         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1051                 return -EBUSY;
1052         runtime->trigger_master = substream;
1053         return 0;
1054 }
1055
1056 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1057 {
1058         struct snd_pcm_runtime *runtime = substream->runtime;
1059         if (runtime->trigger_master != substream)
1060                 return 0;
1061         if (! snd_pcm_running(substream))
1062                 return 0;
1063         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1064         return 0; /* suspend unconditionally */
1065 }
1066
1067 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1068 {
1069         struct snd_pcm_runtime *runtime = substream->runtime;
1070         snd_pcm_trigger_tstamp(substream);
1071         if (substream->timer)
1072                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1073                                  &runtime->trigger_tstamp);
1074         runtime->status->suspended_state = runtime->status->state;
1075         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1076         snd_pcm_tick_set(substream, 0);
1077         wake_up(&runtime->sleep);
1078 }
1079
1080 static struct action_ops snd_pcm_action_suspend = {
1081         .pre_action = snd_pcm_pre_suspend,
1082         .do_action = snd_pcm_do_suspend,
1083         .post_action = snd_pcm_post_suspend
1084 };
1085
1086 /**
1087  * snd_pcm_suspend
1088  * @substream: the PCM substream
1089  *
1090  * Trigger SUSPEND to all linked streams.
1091  * After this call, all streams are changed to SUSPENDED state.
1092  */
1093 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1094 {
1095         int err;
1096         unsigned long flags;
1097
1098         if (! substream)
1099                 return 0;
1100
1101         snd_pcm_stream_lock_irqsave(substream, flags);
1102         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1103         snd_pcm_stream_unlock_irqrestore(substream, flags);
1104         return err;
1105 }
1106
1107 EXPORT_SYMBOL(snd_pcm_suspend);
1108
1109 /**
1110  * snd_pcm_suspend_all
1111  * @pcm: the PCM instance
1112  *
1113  * Trigger SUSPEND to all substreams in the given pcm.
1114  * After this call, all streams are changed to SUSPENDED state.
1115  */
1116 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1117 {
1118         struct snd_pcm_substream *substream;
1119         int stream, err = 0;
1120
1121         if (! pcm)
1122                 return 0;
1123
1124         for (stream = 0; stream < 2; stream++) {
1125                 for (substream = pcm->streams[stream].substream;
1126                      substream; substream = substream->next) {
1127                         /* FIXME: the open/close code should lock this as well */
1128                         if (substream->runtime == NULL)
1129                                 continue;
1130                         err = snd_pcm_suspend(substream);
1131                         if (err < 0 && err != -EBUSY)
1132                                 return err;
1133                 }
1134         }
1135         return 0;
1136 }
1137
1138 EXPORT_SYMBOL(snd_pcm_suspend_all);
1139
1140 /* resume */
1141
1142 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1143 {
1144         struct snd_pcm_runtime *runtime = substream->runtime;
1145         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1146                 return -ENOSYS;
1147         runtime->trigger_master = substream;
1148         return 0;
1149 }
1150
1151 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1152 {
1153         struct snd_pcm_runtime *runtime = substream->runtime;
1154         if (runtime->trigger_master != substream)
1155                 return 0;
1156         /* DMA not running previously? */
1157         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1158             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1159              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1160                 return 0;
1161         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1162 }
1163
1164 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1165 {
1166         if (substream->runtime->trigger_master == substream &&
1167             snd_pcm_running(substream))
1168                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1169 }
1170
1171 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1172 {
1173         struct snd_pcm_runtime *runtime = substream->runtime;
1174         snd_pcm_trigger_tstamp(substream);
1175         if (substream->timer)
1176                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1177                                  &runtime->trigger_tstamp);
1178         runtime->status->state = runtime->status->suspended_state;
1179         if (runtime->sleep_min)
1180                 snd_pcm_tick_prepare(substream);
1181 }
1182
1183 static struct action_ops snd_pcm_action_resume = {
1184         .pre_action = snd_pcm_pre_resume,
1185         .do_action = snd_pcm_do_resume,
1186         .undo_action = snd_pcm_undo_resume,
1187         .post_action = snd_pcm_post_resume
1188 };
1189
1190 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1191 {
1192         struct snd_card *card = substream->pcm->card;
1193         int res;
1194
1195         snd_power_lock(card);
1196         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1197                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1198         snd_power_unlock(card);
1199         return res;
1200 }
1201
1202 #else
1203
1204 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1205 {
1206         return -ENOSYS;
1207 }
1208
1209 #endif /* CONFIG_PM */
1210
1211 /*
1212  * xrun ioctl
1213  *
1214  * Change the RUNNING stream(s) to XRUN state.
1215  */
1216 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1217 {
1218         struct snd_card *card = substream->pcm->card;
1219         struct snd_pcm_runtime *runtime = substream->runtime;
1220         int result;
1221
1222         snd_power_lock(card);
1223         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1224                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1225                 if (result < 0)
1226                         goto _unlock;
1227         }
1228
1229         snd_pcm_stream_lock_irq(substream);
1230         switch (runtime->status->state) {
1231         case SNDRV_PCM_STATE_XRUN:
1232                 result = 0;     /* already there */
1233                 break;
1234         case SNDRV_PCM_STATE_RUNNING:
1235                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1236                 break;
1237         default:
1238                 result = -EBADFD;
1239         }
1240         snd_pcm_stream_unlock_irq(substream);
1241  _unlock:
1242         snd_power_unlock(card);
1243         return result;
1244 }
1245
1246 /*
1247  * reset ioctl
1248  */
1249 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1250 {
1251         struct snd_pcm_runtime *runtime = substream->runtime;
1252         switch (runtime->status->state) {
1253         case SNDRV_PCM_STATE_RUNNING:
1254         case SNDRV_PCM_STATE_PREPARED:
1255         case SNDRV_PCM_STATE_PAUSED:
1256         case SNDRV_PCM_STATE_SUSPENDED:
1257                 return 0;
1258         default:
1259                 return -EBADFD;
1260         }
1261 }
1262
1263 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1264 {
1265         struct snd_pcm_runtime *runtime = substream->runtime;
1266         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1267         if (err < 0)
1268                 return err;
1269         // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1270         runtime->hw_ptr_base = 0;
1271         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1272                 runtime->status->hw_ptr % runtime->period_size;
1273         runtime->silence_start = runtime->status->hw_ptr;
1274         runtime->silence_filled = 0;
1275         return 0;
1276 }
1277
1278 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1279 {
1280         struct snd_pcm_runtime *runtime = substream->runtime;
1281         runtime->control->appl_ptr = runtime->status->hw_ptr;
1282         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1283             runtime->silence_size > 0)
1284                 snd_pcm_playback_silence(substream, ULONG_MAX);
1285 }
1286
1287 static struct action_ops snd_pcm_action_reset = {
1288         .pre_action = snd_pcm_pre_reset,
1289         .do_action = snd_pcm_do_reset,
1290         .post_action = snd_pcm_post_reset
1291 };
1292
1293 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1294 {
1295         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1296 }
1297
1298 /*
1299  * prepare ioctl
1300  */
1301 /* we use the second argument for updating f_flags */
1302 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1303                                int f_flags)
1304 {
1305         struct snd_pcm_runtime *runtime = substream->runtime;
1306         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1307             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1308                 return -EBADFD;
1309         if (snd_pcm_running(substream))
1310                 return -EBUSY;
1311         substream->f_flags = f_flags;
1312         return 0;
1313 }
1314
1315 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1316 {
1317         int err;
1318         err = substream->ops->prepare(substream);
1319         if (err < 0)
1320                 return err;
1321         return snd_pcm_do_reset(substream, 0);
1322 }
1323
1324 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1325 {
1326         struct snd_pcm_runtime *runtime = substream->runtime;
1327         runtime->control->appl_ptr = runtime->status->hw_ptr;
1328         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1329 }
1330
1331 static struct action_ops snd_pcm_action_prepare = {
1332         .pre_action = snd_pcm_pre_prepare,
1333         .do_action = snd_pcm_do_prepare,
1334         .post_action = snd_pcm_post_prepare
1335 };
1336
1337 /**
1338  * snd_pcm_prepare
1339  * @substream: the PCM substream instance
1340  * @file: file to refer f_flags
1341  *
1342  * Prepare the PCM substream to be triggerable.
1343  */
1344 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1345                            struct file *file)
1346 {
1347         int res;
1348         struct snd_card *card = substream->pcm->card;
1349         int f_flags;
1350
1351         if (file)
1352                 f_flags = file->f_flags;
1353         else
1354                 f_flags = substream->f_flags;
1355
1356         snd_power_lock(card);
1357         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1358                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1359                                                substream, f_flags);
1360         snd_power_unlock(card);
1361         return res;
1362 }
1363
1364 /*
1365  * drain ioctl
1366  */
1367
1368 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1369 {
1370         if (substream->f_flags & O_NONBLOCK)
1371                 return -EAGAIN;
1372         substream->runtime->trigger_master = substream;
1373         return 0;
1374 }
1375
1376 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1377 {
1378         struct snd_pcm_runtime *runtime = substream->runtime;
1379         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1380                 switch (runtime->status->state) {
1381                 case SNDRV_PCM_STATE_PREPARED:
1382                         /* start playback stream if possible */
1383                         if (! snd_pcm_playback_empty(substream)) {
1384                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1385                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1386                         }
1387                         break;
1388                 case SNDRV_PCM_STATE_RUNNING:
1389                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1390                         break;
1391                 default:
1392                         break;
1393                 }
1394         } else {
1395                 /* stop running stream */
1396                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1397                         int state = snd_pcm_capture_avail(runtime) > 0 ?
1398                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1399                         snd_pcm_do_stop(substream, state);
1400                         snd_pcm_post_stop(substream, state);
1401                 }
1402         }
1403         return 0;
1404 }
1405
1406 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1407 {
1408 }
1409
1410 static struct action_ops snd_pcm_action_drain_init = {
1411         .pre_action = snd_pcm_pre_drain_init,
1412         .do_action = snd_pcm_do_drain_init,
1413         .post_action = snd_pcm_post_drain_init
1414 };
1415
1416 struct drain_rec {
1417         struct snd_pcm_substream *substream;
1418         wait_queue_t wait;
1419         snd_pcm_uframes_t stop_threshold;
1420 };
1421
1422 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1423
1424 /*
1425  * Drain the stream(s).
1426  * When the substream is linked, sync until the draining of all playback streams
1427  * is finished.
1428  * After this call, all streams are supposed to be either SETUP or DRAINING
1429  * (capture only) state.
1430  */
1431 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1432 {
1433         struct snd_card *card;
1434         struct snd_pcm_runtime *runtime;
1435         struct snd_pcm_substream *s;
1436         int result = 0;
1437         int i, num_drecs;
1438         struct drain_rec *drec, drec_tmp, *d;
1439
1440         snd_assert(substream != NULL, return -ENXIO);
1441         card = substream->pcm->card;
1442         runtime = substream->runtime;
1443
1444         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1445                 return -EBADFD;
1446
1447         snd_power_lock(card);
1448         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1449                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1450                 if (result < 0) {
1451                         snd_power_unlock(card);
1452                         return result;
1453                 }
1454         }
1455
1456         /* allocate temporary record for drain sync */
1457         down_read(&snd_pcm_link_rwsem);
1458         if (snd_pcm_stream_linked(substream)) {
1459                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1460                 if (! drec) {
1461                         up_read(&snd_pcm_link_rwsem);
1462                         snd_power_unlock(card);
1463                         return -ENOMEM;
1464                 }
1465         } else
1466                 drec = &drec_tmp;
1467
1468         /* count only playback streams */
1469         num_drecs = 0;
1470         snd_pcm_group_for_each_entry(s, substream) {
1471                 runtime = s->runtime;
1472                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1473                         d = &drec[num_drecs++];
1474                         d->substream = s;
1475                         init_waitqueue_entry(&d->wait, current);
1476                         add_wait_queue(&runtime->sleep, &d->wait);
1477                         /* stop_threshold fixup to avoid endless loop when
1478                          * stop_threshold > buffer_size
1479                          */
1480                         d->stop_threshold = runtime->stop_threshold;
1481                         if (runtime->stop_threshold > runtime->buffer_size)
1482                                 runtime->stop_threshold = runtime->buffer_size;
1483                 }
1484         }
1485         up_read(&snd_pcm_link_rwsem);
1486
1487         snd_pcm_stream_lock_irq(substream);
1488         /* resume pause */
1489         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1490                 snd_pcm_pause(substream, 0);
1491
1492         /* pre-start/stop - all running streams are changed to DRAINING state */
1493         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1494         if (result < 0) {
1495                 snd_pcm_stream_unlock_irq(substream);
1496                 goto _error;
1497         }
1498
1499         for (;;) {
1500                 long tout;
1501                 if (signal_pending(current)) {
1502                         result = -ERESTARTSYS;
1503                         break;
1504                 }
1505                 /* all finished? */
1506                 for (i = 0; i < num_drecs; i++) {
1507                         runtime = drec[i].substream->runtime;
1508                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1509                                 break;
1510                 }
1511                 if (i == num_drecs)
1512                         break; /* yes, all drained */
1513
1514                 set_current_state(TASK_INTERRUPTIBLE);
1515                 snd_pcm_stream_unlock_irq(substream);
1516                 snd_power_unlock(card);
1517                 tout = schedule_timeout(10 * HZ);
1518                 snd_power_lock(card);
1519                 snd_pcm_stream_lock_irq(substream);
1520                 if (tout == 0) {
1521                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1522                                 result = -ESTRPIPE;
1523                         else {
1524                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1525                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1526                                 result = -EIO;
1527                         }
1528                         break;
1529                 }
1530         }
1531
1532         snd_pcm_stream_unlock_irq(substream);
1533
1534  _error:
1535         for (i = 0; i < num_drecs; i++) {
1536                 d = &drec[i];
1537                 runtime = d->substream->runtime;
1538                 remove_wait_queue(&runtime->sleep, &d->wait);
1539                 runtime->stop_threshold = d->stop_threshold;
1540         }
1541
1542         if (drec != &drec_tmp)
1543                 kfree(drec);
1544         snd_power_unlock(card);
1545
1546         return result;
1547 }
1548
1549 /*
1550  * drop ioctl
1551  *
1552  * Immediately put all linked substreams into SETUP state.
1553  */
1554 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1555 {
1556         struct snd_pcm_runtime *runtime;
1557         struct snd_card *card;
1558         int result = 0;
1559
1560         snd_assert(substream != NULL, return -ENXIO);
1561         runtime = substream->runtime;
1562         card = substream->pcm->card;
1563
1564         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1565             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1566                 return -EBADFD;
1567
1568         snd_power_lock(card);
1569         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1570                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1571                 if (result < 0)
1572                         goto _unlock;
1573         }
1574
1575         snd_pcm_stream_lock_irq(substream);
1576         /* resume pause */
1577         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1578                 snd_pcm_pause(substream, 0);
1579
1580         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1581         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1582         snd_pcm_stream_unlock_irq(substream);
1583  _unlock:
1584         snd_power_unlock(card);
1585         return result;
1586 }
1587
1588
1589 /* WARNING: Don't forget to fput back the file */
1590 static struct file *snd_pcm_file_fd(int fd)
1591 {
1592         struct file *file;
1593         struct inode *inode;
1594         unsigned int minor;
1595
1596         file = fget(fd);
1597         if (!file)
1598                 return NULL;
1599         inode = file->f_path.dentry->d_inode;
1600         if (!S_ISCHR(inode->i_mode) ||
1601             imajor(inode) != snd_major) {
1602                 fput(file);
1603                 return NULL;
1604         }
1605         minor = iminor(inode);
1606         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1607             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1608                 fput(file);
1609                 return NULL;
1610         }
1611         return file;
1612 }
1613
1614 /*
1615  * PCM link handling
1616  */
1617 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1618 {
1619         int res = 0;
1620         struct file *file;
1621         struct snd_pcm_file *pcm_file;
1622         struct snd_pcm_substream *substream1;
1623
1624         file = snd_pcm_file_fd(fd);
1625         if (!file)
1626                 return -EBADFD;
1627         pcm_file = file->private_data;
1628         substream1 = pcm_file->substream;
1629         down_write(&snd_pcm_link_rwsem);
1630         write_lock_irq(&snd_pcm_link_rwlock);
1631         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1632             substream->runtime->status->state != substream1->runtime->status->state) {
1633                 res = -EBADFD;
1634                 goto _end;
1635         }
1636         if (snd_pcm_stream_linked(substream1)) {
1637                 res = -EALREADY;
1638                 goto _end;
1639         }
1640         if (!snd_pcm_stream_linked(substream)) {
1641                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1642                 if (substream->group == NULL) {
1643                         res = -ENOMEM;
1644                         goto _end;
1645                 }
1646                 spin_lock_init(&substream->group->lock);
1647                 INIT_LIST_HEAD(&substream->group->substreams);
1648                 list_add_tail(&substream->link_list, &substream->group->substreams);
1649                 substream->group->count = 1;
1650         }
1651         list_add_tail(&substream1->link_list, &substream->group->substreams);
1652         substream->group->count++;
1653         substream1->group = substream->group;
1654  _end:
1655         write_unlock_irq(&snd_pcm_link_rwlock);
1656         up_write(&snd_pcm_link_rwsem);
1657         fput(file);
1658         return res;
1659 }
1660
1661 static void relink_to_local(struct snd_pcm_substream *substream)
1662 {
1663         substream->group = &substream->self_group;
1664         INIT_LIST_HEAD(&substream->self_group.substreams);
1665         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1666 }
1667
1668 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1669 {
1670         struct snd_pcm_substream *s;
1671         int res = 0;
1672
1673         down_write(&snd_pcm_link_rwsem);
1674         write_lock_irq(&snd_pcm_link_rwlock);
1675         if (!snd_pcm_stream_linked(substream)) {
1676                 res = -EALREADY;
1677                 goto _end;
1678         }
1679         list_del(&substream->link_list);
1680         substream->group->count--;
1681         if (substream->group->count == 1) {     /* detach the last stream, too */
1682                 snd_pcm_group_for_each_entry(s, substream) {
1683                         relink_to_local(s);
1684                         break;
1685                 }
1686                 kfree(substream->group);
1687         }
1688         relink_to_local(substream);
1689        _end:
1690         write_unlock_irq(&snd_pcm_link_rwlock);
1691         up_write(&snd_pcm_link_rwsem);
1692         return res;
1693 }
1694
1695 /*
1696  * hw configurator
1697  */
1698 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1699                                struct snd_pcm_hw_rule *rule)
1700 {
1701         struct snd_interval t;
1702         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1703                      hw_param_interval_c(params, rule->deps[1]), &t);
1704         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1705 }
1706
1707 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1708                                struct snd_pcm_hw_rule *rule)
1709 {
1710         struct snd_interval t;
1711         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1712                      hw_param_interval_c(params, rule->deps[1]), &t);
1713         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1714 }
1715
1716 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1717                                    struct snd_pcm_hw_rule *rule)
1718 {
1719         struct snd_interval t;
1720         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1721                          hw_param_interval_c(params, rule->deps[1]),
1722                          (unsigned long) rule->private, &t);
1723         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1724 }
1725
1726 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1727                                    struct snd_pcm_hw_rule *rule)
1728 {
1729         struct snd_interval t;
1730         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1731                          (unsigned long) rule->private,
1732                          hw_param_interval_c(params, rule->deps[1]), &t);
1733         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1734 }
1735
1736 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1737                                   struct snd_pcm_hw_rule *rule)
1738 {
1739         unsigned int k;
1740         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1741         struct snd_mask m;
1742         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1743         snd_mask_any(&m);
1744         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1745                 int bits;
1746                 if (! snd_mask_test(mask, k))
1747                         continue;
1748                 bits = snd_pcm_format_physical_width(k);
1749                 if (bits <= 0)
1750                         continue; /* ignore invalid formats */
1751                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1752                         snd_mask_reset(&m, k);
1753         }
1754         return snd_mask_refine(mask, &m);
1755 }
1756
1757 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1758                                        struct snd_pcm_hw_rule *rule)
1759 {
1760         struct snd_interval t;
1761         unsigned int k;
1762         t.min = UINT_MAX;
1763         t.max = 0;
1764         t.openmin = 0;
1765         t.openmax = 0;
1766         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1767                 int bits;
1768                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1769                         continue;
1770                 bits = snd_pcm_format_physical_width(k);
1771                 if (bits <= 0)
1772                         continue; /* ignore invalid formats */
1773                 if (t.min > (unsigned)bits)
1774                         t.min = bits;
1775                 if (t.max < (unsigned)bits)
1776                         t.max = bits;
1777         }
1778         t.integer = 1;
1779         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1780 }
1781
1782 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1783 #error "Change this table"
1784 #endif
1785
1786 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1787                                  48000, 64000, 88200, 96000, 176400, 192000 };
1788
1789 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1790                                 struct snd_pcm_hw_rule *rule)
1791 {
1792         struct snd_pcm_hardware *hw = rule->private;
1793         return snd_interval_list(hw_param_interval(params, rule->var),
1794                                  ARRAY_SIZE(rates), rates, hw->rates);
1795 }
1796
1797 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1798                                             struct snd_pcm_hw_rule *rule)
1799 {
1800         struct snd_interval t;
1801         struct snd_pcm_substream *substream = rule->private;
1802         t.min = 0;
1803         t.max = substream->buffer_bytes_max;
1804         t.openmin = 0;
1805         t.openmax = 0;
1806         t.integer = 1;
1807         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1808 }
1809
1810 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1811 {
1812         struct snd_pcm_runtime *runtime = substream->runtime;
1813         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1814         int k, err;
1815
1816         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1817                 snd_mask_any(constrs_mask(constrs, k));
1818         }
1819
1820         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1821                 snd_interval_any(constrs_interval(constrs, k));
1822         }
1823
1824         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1825         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1826         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1827         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1828         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1829
1830         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1831                                    snd_pcm_hw_rule_format, NULL,
1832                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1833         if (err < 0)
1834                 return err;
1835         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1836                                   snd_pcm_hw_rule_sample_bits, NULL,
1837                                   SNDRV_PCM_HW_PARAM_FORMAT,
1838                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1839         if (err < 0)
1840                 return err;
1841         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1842                                   snd_pcm_hw_rule_div, NULL,
1843                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1844         if (err < 0)
1845                 return err;
1846         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1847                                   snd_pcm_hw_rule_mul, NULL,
1848                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1849         if (err < 0)
1850                 return err;
1851         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1852                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1853                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1854         if (err < 0)
1855                 return err;
1856         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1857                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1858                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1859         if (err < 0)
1860                 return err;
1861         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1862                                   snd_pcm_hw_rule_div, NULL,
1863                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1864         if (err < 0)
1865                 return err;
1866         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1867                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1868                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1869         if (err < 0)
1870                 return err;
1871         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1872                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1873                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1874         if (err < 0)
1875                 return err;
1876         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1877                                   snd_pcm_hw_rule_div, NULL,
1878                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1879         if (err < 0)
1880                 return err;
1881         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1882                                   snd_pcm_hw_rule_div, NULL,
1883                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1884         if (err < 0)
1885                 return err;
1886         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1887                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1888                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1889         if (err < 0)
1890                 return err;
1891         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1892                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1893                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1894         if (err < 0)
1895                 return err;
1896         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1897                                   snd_pcm_hw_rule_mul, NULL,
1898                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1899         if (err < 0)
1900                 return err;
1901         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1902                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1903                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1904         if (err < 0)
1905                 return err;
1906         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1907                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1908                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1909         if (err < 0)
1910                 return err;
1911         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1912                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1913                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1914         if (err < 0)
1915                 return err;
1916         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1917                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1918                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1919         if (err < 0)
1920                 return err;
1921         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1922                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1923                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1924         if (err < 0)
1925                 return err;
1926         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1927                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1928                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1929         if (err < 0)
1930                 return err;
1931         return 0;
1932 }
1933
1934 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1935 {
1936         struct snd_pcm_runtime *runtime = substream->runtime;
1937         struct snd_pcm_hardware *hw = &runtime->hw;
1938         int err;
1939         unsigned int mask = 0;
1940
1941         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1942                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1943         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1944                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1945         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1946                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1947                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1948                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1949                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1950                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1951                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1952         }
1953         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1954         snd_assert(err >= 0, return -EINVAL);
1955
1956         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1957         snd_assert(err >= 0, return -EINVAL);
1958
1959         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1960         snd_assert(err >= 0, return -EINVAL);
1961
1962         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1963                                            hw->channels_min, hw->channels_max);
1964         snd_assert(err >= 0, return -EINVAL);
1965
1966         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1967                                            hw->rate_min, hw->rate_max);
1968         snd_assert(err >= 0, return -EINVAL);
1969
1970         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1971                                            hw->period_bytes_min, hw->period_bytes_max);
1972         snd_assert(err >= 0, return -EINVAL);
1973
1974         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1975                                            hw->periods_min, hw->periods_max);
1976         snd_assert(err >= 0, return -EINVAL);
1977
1978         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1979                                            hw->period_bytes_min, hw->buffer_bytes_max);
1980         snd_assert(err >= 0, return -EINVAL);
1981
1982         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1983                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1984                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1985         if (err < 0)
1986                 return err;
1987
1988         /* FIXME: remove */
1989         if (runtime->dma_bytes) {
1990                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1991                 snd_assert(err >= 0, return -EINVAL);
1992         }
1993
1994         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1995                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1996                                           snd_pcm_hw_rule_rate, hw,
1997                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1998                 if (err < 0)
1999                         return err;
2000         }
2001
2002         /* FIXME: this belong to lowlevel */
2003         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_TICK_TIME,
2004                                      1000000 / HZ, 1000000 / HZ);
2005         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2006
2007         return 0;
2008 }
2009
2010 static void pcm_release_private(struct snd_pcm_substream *substream)
2011 {
2012         snd_pcm_unlink(substream);
2013 }
2014
2015 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2016 {
2017         substream->ref_count--;
2018         if (substream->ref_count > 0)
2019                 return;
2020
2021         snd_pcm_drop(substream);
2022         if (substream->hw_opened) {
2023                 if (substream->ops->hw_free != NULL)
2024                         substream->ops->hw_free(substream);
2025                 substream->ops->close(substream);
2026                 substream->hw_opened = 0;
2027         }
2028         if (substream->pcm_release) {
2029                 substream->pcm_release(substream);
2030                 substream->pcm_release = NULL;
2031         }
2032         snd_pcm_detach_substream(substream);
2033 }
2034
2035 EXPORT_SYMBOL(snd_pcm_release_substream);
2036
2037 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2038                            struct file *file,
2039                            struct snd_pcm_substream **rsubstream)
2040 {
2041         struct snd_pcm_substream *substream;
2042         int err;
2043
2044         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2045         if (err < 0)
2046                 return err;
2047         if (substream->ref_count > 1) {
2048                 *rsubstream = substream;
2049                 return 0;
2050         }
2051
2052         err = snd_pcm_hw_constraints_init(substream);
2053         if (err < 0) {
2054                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2055                 goto error;
2056         }
2057
2058         if ((err = substream->ops->open(substream)) < 0)
2059                 goto error;
2060
2061         substream->hw_opened = 1;
2062
2063         err = snd_pcm_hw_constraints_complete(substream);
2064         if (err < 0) {
2065                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2066                 goto error;
2067         }
2068
2069         *rsubstream = substream;
2070         return 0;
2071
2072  error:
2073         snd_pcm_release_substream(substream);
2074         return err;
2075 }
2076
2077 EXPORT_SYMBOL(snd_pcm_open_substream);
2078
2079 static int snd_pcm_open_file(struct file *file,
2080                              struct snd_pcm *pcm,
2081                              int stream,
2082                              struct snd_pcm_file **rpcm_file)
2083 {
2084         struct snd_pcm_file *pcm_file;
2085         struct snd_pcm_substream *substream;
2086         struct snd_pcm_str *str;
2087         int err;
2088
2089         snd_assert(rpcm_file != NULL, return -EINVAL);
2090         *rpcm_file = NULL;
2091
2092         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2093         if (err < 0)
2094                 return err;
2095
2096         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2097         if (pcm_file == NULL) {
2098                 snd_pcm_release_substream(substream);
2099                 return -ENOMEM;
2100         }
2101         pcm_file->substream = substream;
2102         if (substream->ref_count == 1) {
2103                 str = substream->pstr;
2104                 substream->file = pcm_file;
2105                 substream->pcm_release = pcm_release_private;
2106         }
2107         file->private_data = pcm_file;
2108         *rpcm_file = pcm_file;
2109         return 0;
2110 }
2111
2112 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2113 {
2114         struct snd_pcm *pcm;
2115
2116         pcm = snd_lookup_minor_data(iminor(inode),
2117                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2118         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2119 }
2120
2121 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2122 {
2123         struct snd_pcm *pcm;
2124
2125         pcm = snd_lookup_minor_data(iminor(inode),
2126                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2127         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2128 }
2129
2130 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2131 {
2132         int err;
2133         struct snd_pcm_file *pcm_file;
2134         wait_queue_t wait;
2135
2136         if (pcm == NULL) {
2137                 err = -ENODEV;
2138                 goto __error1;
2139         }
2140         err = snd_card_file_add(pcm->card, file);
2141         if (err < 0)
2142                 goto __error1;
2143         if (!try_module_get(pcm->card->module)) {
2144                 err = -EFAULT;
2145                 goto __error2;
2146         }
2147         init_waitqueue_entry(&wait, current);
2148         add_wait_queue(&pcm->open_wait, &wait);
2149         mutex_lock(&pcm->open_mutex);
2150         while (1) {
2151                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2152                 if (err >= 0)
2153                         break;
2154                 if (err == -EAGAIN) {
2155                         if (file->f_flags & O_NONBLOCK) {
2156                                 err = -EBUSY;
2157                                 break;
2158                         }
2159                 } else
2160                         break;
2161                 set_current_state(TASK_INTERRUPTIBLE);
2162                 mutex_unlock(&pcm->open_mutex);
2163                 schedule();
2164                 mutex_lock(&pcm->open_mutex);
2165                 if (signal_pending(current)) {
2166                         err = -ERESTARTSYS;
2167                         break;
2168                 }
2169         }
2170         remove_wait_queue(&pcm->open_wait, &wait);
2171         mutex_unlock(&pcm->open_mutex);
2172         if (err < 0)
2173                 goto __error;
2174         return err;
2175
2176       __error:
2177         module_put(pcm->card->module);
2178       __error2:
2179         snd_card_file_remove(pcm->card, file);
2180       __error1:
2181         return err;
2182 }
2183
2184 static int snd_pcm_release(struct inode *inode, struct file *file)
2185 {
2186         struct snd_pcm *pcm;
2187         struct snd_pcm_substream *substream;
2188         struct snd_pcm_file *pcm_file;
2189
2190         pcm_file = file->private_data;
2191         substream = pcm_file->substream;
2192         snd_assert(substream != NULL, return -ENXIO);
2193         pcm = substream->pcm;
2194         fasync_helper(-1, file, 0, &substream->runtime->fasync);
2195         mutex_lock(&pcm->open_mutex);
2196         snd_pcm_release_substream(substream);
2197         kfree(pcm_file);
2198         mutex_unlock(&pcm->open_mutex);
2199         wake_up(&pcm->open_wait);
2200         module_put(pcm->card->module);
2201         snd_card_file_remove(pcm->card, file);
2202         return 0;
2203 }
2204
2205 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2206                                                  snd_pcm_uframes_t frames)
2207 {
2208         struct snd_pcm_runtime *runtime = substream->runtime;
2209         snd_pcm_sframes_t appl_ptr;
2210         snd_pcm_sframes_t ret;
2211         snd_pcm_sframes_t hw_avail;
2212
2213         if (frames == 0)
2214                 return 0;
2215
2216         snd_pcm_stream_lock_irq(substream);
2217         switch (runtime->status->state) {
2218         case SNDRV_PCM_STATE_PREPARED:
2219                 break;
2220         case SNDRV_PCM_STATE_DRAINING:
2221         case SNDRV_PCM_STATE_RUNNING:
2222                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2223                         break;
2224                 /* Fall through */
2225         case SNDRV_PCM_STATE_XRUN:
2226                 ret = -EPIPE;
2227                 goto __end;
2228         default:
2229                 ret = -EBADFD;
2230                 goto __end;
2231         }
2232
2233         hw_avail = snd_pcm_playback_hw_avail(runtime);
2234         if (hw_avail <= 0) {
2235                 ret = 0;
2236                 goto __end;
2237         }
2238         if (frames > (snd_pcm_uframes_t)hw_avail)
2239                 frames = hw_avail;
2240         else
2241                 frames -= frames % runtime->xfer_align;
2242         appl_ptr = runtime->control->appl_ptr - frames;
2243         if (appl_ptr < 0)
2244                 appl_ptr += runtime->boundary;
2245         runtime->control->appl_ptr = appl_ptr;
2246         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2247             runtime->sleep_min)
2248                 snd_pcm_tick_prepare(substream);
2249         ret = frames;
2250  __end:
2251         snd_pcm_stream_unlock_irq(substream);
2252         return ret;
2253 }
2254
2255 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2256                                                 snd_pcm_uframes_t frames)
2257 {
2258         struct snd_pcm_runtime *runtime = substream->runtime;
2259         snd_pcm_sframes_t appl_ptr;
2260         snd_pcm_sframes_t ret;
2261         snd_pcm_sframes_t hw_avail;
2262
2263         if (frames == 0)
2264                 return 0;
2265
2266         snd_pcm_stream_lock_irq(substream);
2267         switch (runtime->status->state) {
2268         case SNDRV_PCM_STATE_PREPARED:
2269         case SNDRV_PCM_STATE_DRAINING:
2270                 break;
2271         case SNDRV_PCM_STATE_RUNNING:
2272                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2273                         break;
2274                 /* Fall through */
2275         case SNDRV_PCM_STATE_XRUN:
2276                 ret = -EPIPE;
2277                 goto __end;
2278         default:
2279                 ret = -EBADFD;
2280                 goto __end;
2281         }
2282
2283         hw_avail = snd_pcm_capture_hw_avail(runtime);
2284         if (hw_avail <= 0) {
2285                 ret = 0;
2286                 goto __end;
2287         }
2288         if (frames > (snd_pcm_uframes_t)hw_avail)
2289                 frames = hw_avail;
2290         else
2291                 frames -= frames % runtime->xfer_align;
2292         appl_ptr = runtime->control->appl_ptr - frames;
2293         if (appl_ptr < 0)
2294                 appl_ptr += runtime->boundary;
2295         runtime->control->appl_ptr = appl_ptr;
2296         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2297             runtime->sleep_min)
2298                 snd_pcm_tick_prepare(substream);
2299         ret = frames;
2300  __end:
2301         snd_pcm_stream_unlock_irq(substream);
2302         return ret;
2303 }
2304
2305 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2306                                                   snd_pcm_uframes_t frames)
2307 {
2308         struct snd_pcm_runtime *runtime = substream->runtime;
2309         snd_pcm_sframes_t appl_ptr;
2310         snd_pcm_sframes_t ret;
2311         snd_pcm_sframes_t avail;
2312
2313         if (frames == 0)
2314                 return 0;
2315
2316         snd_pcm_stream_lock_irq(substream);
2317         switch (runtime->status->state) {
2318         case SNDRV_PCM_STATE_PREPARED:
2319         case SNDRV_PCM_STATE_PAUSED:
2320                 break;
2321         case SNDRV_PCM_STATE_DRAINING:
2322         case SNDRV_PCM_STATE_RUNNING:
2323                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2324                         break;
2325                 /* Fall through */
2326         case SNDRV_PCM_STATE_XRUN:
2327                 ret = -EPIPE;
2328                 goto __end;
2329         default:
2330                 ret = -EBADFD;
2331                 goto __end;
2332         }
2333
2334         avail = snd_pcm_playback_avail(runtime);
2335         if (avail <= 0) {
2336                 ret = 0;
2337                 goto __end;
2338         }
2339         if (frames > (snd_pcm_uframes_t)avail)
2340                 frames = avail;
2341         else
2342                 frames -= frames % runtime->xfer_align;
2343         appl_ptr = runtime->control->appl_ptr + frames;
2344         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2345                 appl_ptr -= runtime->boundary;
2346         runtime->control->appl_ptr = appl_ptr;
2347         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2348             runtime->sleep_min)
2349                 snd_pcm_tick_prepare(substream);
2350         ret = frames;
2351  __end:
2352         snd_pcm_stream_unlock_irq(substream);
2353         return ret;
2354 }
2355
2356 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2357                                                  snd_pcm_uframes_t frames)
2358 {
2359         struct snd_pcm_runtime *runtime = substream->runtime;
2360         snd_pcm_sframes_t appl_ptr;
2361         snd_pcm_sframes_t ret;
2362         snd_pcm_sframes_t avail;
2363
2364         if (frames == 0)
2365                 return 0;
2366
2367         snd_pcm_stream_lock_irq(substream);
2368         switch (runtime->status->state) {
2369         case SNDRV_PCM_STATE_PREPARED:
2370         case SNDRV_PCM_STATE_DRAINING:
2371         case SNDRV_PCM_STATE_PAUSED:
2372                 break;
2373         case SNDRV_PCM_STATE_RUNNING:
2374                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2375                         break;
2376                 /* Fall through */
2377         case SNDRV_PCM_STATE_XRUN:
2378                 ret = -EPIPE;
2379                 goto __end;
2380         default:
2381                 ret = -EBADFD;
2382                 goto __end;
2383         }
2384
2385         avail = snd_pcm_capture_avail(runtime);
2386         if (avail <= 0) {
2387                 ret = 0;
2388                 goto __end;
2389         }
2390         if (frames > (snd_pcm_uframes_t)avail)
2391                 frames = avail;
2392         else
2393                 frames -= frames % runtime->xfer_align;
2394         appl_ptr = runtime->control->appl_ptr + frames;
2395         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2396                 appl_ptr -= runtime->boundary;
2397         runtime->control->appl_ptr = appl_ptr;
2398         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2399             runtime->sleep_min)
2400                 snd_pcm_tick_prepare(substream);
2401         ret = frames;
2402  __end:
2403         snd_pcm_stream_unlock_irq(substream);
2404         return ret;
2405 }
2406
2407 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2408 {
2409         struct snd_pcm_runtime *runtime = substream->runtime;
2410         int err;
2411
2412         snd_pcm_stream_lock_irq(substream);
2413         switch (runtime->status->state) {
2414         case SNDRV_PCM_STATE_DRAINING:
2415                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2416                         goto __badfd;
2417         case SNDRV_PCM_STATE_RUNNING:
2418                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2419                         break;
2420                 /* Fall through */
2421         case SNDRV_PCM_STATE_PREPARED:
2422         case SNDRV_PCM_STATE_SUSPENDED:
2423                 err = 0;
2424                 break;
2425         case SNDRV_PCM_STATE_XRUN:
2426                 err = -EPIPE;
2427                 break;
2428         default:
2429               __badfd:
2430                 err = -EBADFD;
2431                 break;
2432         }
2433         snd_pcm_stream_unlock_irq(substream);
2434         return err;
2435 }
2436
2437 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2438                          snd_pcm_sframes_t __user *res)
2439 {
2440         struct snd_pcm_runtime *runtime = substream->runtime;
2441         int err;
2442         snd_pcm_sframes_t n = 0;
2443
2444         snd_pcm_stream_lock_irq(substream);
2445         switch (runtime->status->state) {
2446         case SNDRV_PCM_STATE_DRAINING:
2447                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2448                         goto __badfd;
2449         case SNDRV_PCM_STATE_RUNNING:
2450                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2451                         break;
2452                 /* Fall through */
2453         case SNDRV_PCM_STATE_PREPARED:
2454         case SNDRV_PCM_STATE_SUSPENDED:
2455                 err = 0;
2456                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2457                         n = snd_pcm_playback_hw_avail(runtime);
2458                 else
2459                         n = snd_pcm_capture_avail(runtime);
2460                 break;
2461         case SNDRV_PCM_STATE_XRUN:
2462                 err = -EPIPE;
2463                 break;
2464         default:
2465               __badfd:
2466                 err = -EBADFD;
2467                 break;
2468         }
2469         snd_pcm_stream_unlock_irq(substream);
2470         if (!err)
2471                 if (put_user(n, res))
2472                         err = -EFAULT;
2473         return err;
2474 }
2475
2476 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2477                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2478 {
2479         struct snd_pcm_runtime *runtime = substream->runtime;
2480         struct snd_pcm_sync_ptr sync_ptr;
2481         volatile struct snd_pcm_mmap_status *status;
2482         volatile struct snd_pcm_mmap_control *control;
2483         int err;
2484
2485         memset(&sync_ptr, 0, sizeof(sync_ptr));
2486         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2487                 return -EFAULT;
2488         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2489                 return -EFAULT;
2490         status = runtime->status;
2491         control = runtime->control;
2492         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2493                 err = snd_pcm_hwsync(substream);
2494                 if (err < 0)
2495                         return err;
2496         }
2497         snd_pcm_stream_lock_irq(substream);
2498         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2499                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2500         else
2501                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2502         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2503                 control->avail_min = sync_ptr.c.control.avail_min;
2504         else
2505                 sync_ptr.c.control.avail_min = control->avail_min;
2506         sync_ptr.s.status.state = status->state;
2507         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2508         sync_ptr.s.status.tstamp = status->tstamp;
2509         sync_ptr.s.status.suspended_state = status->suspended_state;
2510         snd_pcm_stream_unlock_irq(substream);
2511         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2512                 return -EFAULT;
2513         return 0;
2514 }
2515
2516 static int snd_pcm_common_ioctl1(struct file *file,
2517                                  struct snd_pcm_substream *substream,
2518                                  unsigned int cmd, void __user *arg)
2519 {
2520         snd_assert(substream != NULL, return -ENXIO);
2521
2522         switch (cmd) {
2523         case SNDRV_PCM_IOCTL_PVERSION:
2524                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2525         case SNDRV_PCM_IOCTL_INFO:
2526                 return snd_pcm_info_user(substream, arg);
2527         case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2528                 return 0;
2529         case SNDRV_PCM_IOCTL_HW_REFINE:
2530                 return snd_pcm_hw_refine_user(substream, arg);
2531         case SNDRV_PCM_IOCTL_HW_PARAMS:
2532                 return snd_pcm_hw_params_user(substream, arg);
2533         case SNDRV_PCM_IOCTL_HW_FREE:
2534                 return snd_pcm_hw_free(substream);
2535         case SNDRV_PCM_IOCTL_SW_PARAMS:
2536                 return snd_pcm_sw_params_user(substream, arg);
2537         case SNDRV_PCM_IOCTL_STATUS:
2538                 return snd_pcm_status_user(substream, arg);
2539         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2540                 return snd_pcm_channel_info_user(substream, arg);
2541         case SNDRV_PCM_IOCTL_PREPARE:
2542                 return snd_pcm_prepare(substream, file);
2543         case SNDRV_PCM_IOCTL_RESET:
2544                 return snd_pcm_reset(substream);
2545         case SNDRV_PCM_IOCTL_START:
2546                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2547         case SNDRV_PCM_IOCTL_LINK:
2548                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2549         case SNDRV_PCM_IOCTL_UNLINK:
2550                 return snd_pcm_unlink(substream);
2551         case SNDRV_PCM_IOCTL_RESUME:
2552                 return snd_pcm_resume(substream);
2553         case SNDRV_PCM_IOCTL_XRUN:
2554                 return snd_pcm_xrun(substream);
2555         case SNDRV_PCM_IOCTL_HWSYNC:
2556                 return snd_pcm_hwsync(substream);
2557         case SNDRV_PCM_IOCTL_DELAY:
2558                 return snd_pcm_delay(substream, arg);
2559         case SNDRV_PCM_IOCTL_SYNC_PTR:
2560                 return snd_pcm_sync_ptr(substream, arg);
2561 #ifdef CONFIG_SND_SUPPORT_OLD_API
2562         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2563                 return snd_pcm_hw_refine_old_user(substream, arg);
2564         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2565                 return snd_pcm_hw_params_old_user(substream, arg);
2566 #endif
2567         case SNDRV_PCM_IOCTL_DRAIN:
2568                 return snd_pcm_drain(substream);
2569         case SNDRV_PCM_IOCTL_DROP:
2570                 return snd_pcm_drop(substream);
2571         case SNDRV_PCM_IOCTL_PAUSE:
2572         {
2573                 int res;
2574                 snd_pcm_stream_lock_irq(substream);
2575                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2576                 snd_pcm_stream_unlock_irq(substream);
2577                 return res;
2578         }
2579         }
2580         snd_printd("unknown ioctl = 0x%x\n", cmd);
2581         return -ENOTTY;
2582 }
2583
2584 static int snd_pcm_playback_ioctl1(struct file *file,
2585                                    struct snd_pcm_substream *substream,
2586                                    unsigned int cmd, void __user *arg)
2587 {
2588         snd_assert(substream != NULL, return -ENXIO);
2589         snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL);
2590         switch (cmd) {
2591         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2592         {
2593                 struct snd_xferi xferi;
2594                 struct snd_xferi __user *_xferi = arg;
2595                 struct snd_pcm_runtime *runtime = substream->runtime;
2596                 snd_pcm_sframes_t result;
2597                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2598                         return -EBADFD;
2599                 if (put_user(0, &_xferi->result))
2600                         return -EFAULT;
2601                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2602                         return -EFAULT;
2603                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2604                 __put_user(result, &_xferi->result);
2605                 return result < 0 ? result : 0;
2606         }
2607         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2608         {
2609                 struct snd_xfern xfern;
2610                 struct snd_xfern __user *_xfern = arg;
2611                 struct snd_pcm_runtime *runtime = substream->runtime;
2612                 void __user **bufs;
2613                 snd_pcm_sframes_t result;
2614                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2615                         return -EBADFD;
2616                 if (runtime->channels > 128)
2617                         return -EINVAL;
2618                 if (put_user(0, &_xfern->result))
2619                         return -EFAULT;
2620                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2621                         return -EFAULT;
2622                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2623                 if (bufs == NULL)
2624                         return -ENOMEM;
2625                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2626                         kfree(bufs);
2627                         return -EFAULT;
2628                 }
2629                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2630                 kfree(bufs);
2631                 __put_user(result, &_xfern->result);
2632                 return result < 0 ? result : 0;
2633         }
2634         case SNDRV_PCM_IOCTL_REWIND:
2635         {
2636                 snd_pcm_uframes_t frames;
2637                 snd_pcm_uframes_t __user *_frames = arg;
2638                 snd_pcm_sframes_t result;
2639                 if (get_user(frames, _frames))
2640                         return -EFAULT;
2641                 if (put_user(0, _frames))
2642                         return -EFAULT;
2643                 result = snd_pcm_playback_rewind(substream, frames);
2644                 __put_user(result, _frames);
2645                 return result < 0 ? result : 0;
2646         }
2647         case SNDRV_PCM_IOCTL_FORWARD:
2648         {
2649                 snd_pcm_uframes_t frames;
2650                 snd_pcm_uframes_t __user *_frames = arg;
2651                 snd_pcm_sframes_t result;
2652                 if (get_user(frames, _frames))
2653                         return -EFAULT;
2654                 if (put_user(0, _frames))
2655                         return -EFAULT;
2656                 result = snd_pcm_playback_forward(substream, frames);
2657                 __put_user(result, _frames);
2658                 return result < 0 ? result : 0;
2659         }
2660         }
2661         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2662 }
2663
2664 static int snd_pcm_capture_ioctl1(struct file *file,
2665                                   struct snd_pcm_substream *substream,
2666                                   unsigned int cmd, void __user *arg)
2667 {
2668         snd_assert(substream != NULL, return -ENXIO);
2669         snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL);
2670         switch (cmd) {
2671         case SNDRV_PCM_IOCTL_READI_FRAMES:
2672         {
2673                 struct snd_xferi xferi;
2674                 struct snd_xferi __user *_xferi = arg;
2675                 struct snd_pcm_runtime *runtime = substream->runtime;
2676                 snd_pcm_sframes_t result;
2677                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2678                         return -EBADFD;
2679                 if (put_user(0, &_xferi->result))
2680                         return -EFAULT;
2681                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2682                         return -EFAULT;
2683                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2684                 __put_user(result, &_xferi->result);
2685                 return result < 0 ? result : 0;
2686         }
2687         case SNDRV_PCM_IOCTL_READN_FRAMES:
2688         {
2689                 struct snd_xfern xfern;
2690                 struct snd_xfern __user *_xfern = arg;
2691                 struct snd_pcm_runtime *runtime = substream->runtime;
2692                 void *bufs;
2693                 snd_pcm_sframes_t result;
2694                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2695                         return -EBADFD;
2696                 if (runtime->channels > 128)
2697                         return -EINVAL;
2698                 if (put_user(0, &_xfern->result))
2699                         return -EFAULT;
2700                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2701                         return -EFAULT;
2702                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2703                 if (bufs == NULL)
2704                         return -ENOMEM;
2705                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2706                         kfree(bufs);
2707                         return -EFAULT;
2708                 }
2709                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2710                 kfree(bufs);
2711                 __put_user(result, &_xfern->result);
2712                 return result < 0 ? result : 0;
2713         }
2714         case SNDRV_PCM_IOCTL_REWIND:
2715         {
2716                 snd_pcm_uframes_t frames;
2717                 snd_pcm_uframes_t __user *_frames = arg;
2718                 snd_pcm_sframes_t result;
2719                 if (get_user(frames, _frames))
2720                         return -EFAULT;
2721                 if (put_user(0, _frames))
2722                         return -EFAULT;
2723                 result = snd_pcm_capture_rewind(substream, frames);
2724                 __put_user(result, _frames);
2725                 return result < 0 ? result : 0;
2726         }
2727         case SNDRV_PCM_IOCTL_FORWARD:
2728         {
2729                 snd_pcm_uframes_t frames;
2730                 snd_pcm_uframes_t __user *_frames = arg;
2731                 snd_pcm_sframes_t result;
2732                 if (get_user(frames, _frames))
2733                         return -EFAULT;
2734                 if (put_user(0, _frames))
2735                         return -EFAULT;
2736                 result = snd_pcm_capture_forward(substream, frames);
2737                 __put_user(result, _frames);
2738                 return result < 0 ? result : 0;
2739         }
2740         }
2741         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2742 }
2743
2744 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2745                                    unsigned long arg)
2746 {
2747         struct snd_pcm_file *pcm_file;
2748
2749         pcm_file = file->private_data;
2750
2751         if (((cmd >> 8) & 0xff) != 'A')
2752                 return -ENOTTY;
2753
2754         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2755                                        (void __user *)arg);
2756 }
2757
2758 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2759                                   unsigned long arg)
2760 {
2761         struct snd_pcm_file *pcm_file;
2762
2763         pcm_file = file->private_data;
2764
2765         if (((cmd >> 8) & 0xff) != 'A')
2766                 return -ENOTTY;
2767
2768         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2769                                       (void __user *)arg);
2770 }
2771
2772 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2773                          unsigned int cmd, void *arg)
2774 {
2775         mm_segment_t fs;
2776         int result;
2777
2778         fs = snd_enter_user();
2779         switch (substream->stream) {
2780         case SNDRV_PCM_STREAM_PLAYBACK:
2781                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2782                                                  (void __user *)arg);
2783                 break;
2784         case SNDRV_PCM_STREAM_CAPTURE:
2785                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2786                                                 (void __user *)arg);
2787                 break;
2788         default:
2789                 result = -EINVAL;
2790                 break;
2791         }
2792         snd_leave_user(fs);
2793         return result;
2794 }
2795
2796 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2797
2798 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2799                             loff_t * offset)
2800 {
2801         struct snd_pcm_file *pcm_file;
2802         struct snd_pcm_substream *substream;
2803         struct snd_pcm_runtime *runtime;
2804         snd_pcm_sframes_t result;
2805
2806         pcm_file = file->private_data;
2807         substream = pcm_file->substream;
2808         snd_assert(substream != NULL, return -ENXIO);
2809         runtime = substream->runtime;
2810         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2811                 return -EBADFD;
2812         if (!frame_aligned(runtime, count))
2813                 return -EINVAL;
2814         count = bytes_to_frames(runtime, count);
2815         result = snd_pcm_lib_read(substream, buf, count);
2816         if (result > 0)
2817                 result = frames_to_bytes(runtime, result);
2818         return result;
2819 }
2820
2821 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2822                              size_t count, loff_t * offset)
2823 {
2824         struct snd_pcm_file *pcm_file;
2825         struct snd_pcm_substream *substream;
2826         struct snd_pcm_runtime *runtime;
2827         snd_pcm_sframes_t result;
2828
2829         pcm_file = file->private_data;
2830         substream = pcm_file->substream;
2831         snd_assert(substream != NULL, result = -ENXIO; goto end);
2832         runtime = substream->runtime;
2833         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2834                 result = -EBADFD;
2835                 goto end;
2836         }
2837         if (!frame_aligned(runtime, count)) {
2838                 result = -EINVAL;
2839                 goto end;
2840         }
2841         count = bytes_to_frames(runtime, count);
2842         result = snd_pcm_lib_write(substream, buf, count);
2843         if (result > 0)
2844                 result = frames_to_bytes(runtime, result);
2845  end:
2846         return result;
2847 }
2848
2849 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2850                              unsigned long nr_segs, loff_t pos)
2851
2852 {
2853         struct snd_pcm_file *pcm_file;
2854         struct snd_pcm_substream *substream;
2855         struct snd_pcm_runtime *runtime;
2856         snd_pcm_sframes_t result;
2857         unsigned long i;
2858         void __user **bufs;
2859         snd_pcm_uframes_t frames;
2860
2861         pcm_file = iocb->ki_filp->private_data;
2862         substream = pcm_file->substream;
2863         snd_assert(substream != NULL, return -ENXIO);
2864         runtime = substream->runtime;
2865         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2866                 return -EBADFD;
2867         if (nr_segs > 1024 || nr_segs != runtime->channels)
2868                 return -EINVAL;
2869         if (!frame_aligned(runtime, iov->iov_len))
2870                 return -EINVAL;
2871         frames = bytes_to_samples(runtime, iov->iov_len);
2872         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2873         if (bufs == NULL)
2874                 return -ENOMEM;
2875         for (i = 0; i < nr_segs; ++i)
2876                 bufs[i] = iov[i].iov_base;
2877         result = snd_pcm_lib_readv(substream, bufs, frames);
2878         if (result > 0)
2879                 result = frames_to_bytes(runtime, result);
2880         kfree(bufs);
2881         return result;
2882 }
2883
2884 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2885                               unsigned long nr_segs, loff_t pos)
2886 {
2887         struct snd_pcm_file *pcm_file;
2888         struct snd_pcm_substream *substream;
2889         struct snd_pcm_runtime *runtime;
2890         snd_pcm_sframes_t result;
2891         unsigned long i;
2892         void __user **bufs;
2893         snd_pcm_uframes_t frames;
2894
2895         pcm_file = iocb->ki_filp->private_data;
2896         substream = pcm_file->substream;
2897         snd_assert(substream != NULL, result = -ENXIO; goto end);
2898         runtime = substream->runtime;
2899         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2900                 result = -EBADFD;
2901                 goto end;
2902         }
2903         if (nr_segs > 128 || nr_segs != runtime->channels ||
2904             !frame_aligned(runtime, iov->iov_len)) {
2905                 result = -EINVAL;
2906                 goto end;
2907         }
2908         frames = bytes_to_samples(runtime, iov->iov_len);
2909         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2910         if (bufs == NULL)
2911                 return -ENOMEM;
2912         for (i = 0; i < nr_segs; ++i)
2913                 bufs[i] = iov[i].iov_base;
2914         result = snd_pcm_lib_writev(substream, bufs, frames);
2915         if (result > 0)
2916                 result = frames_to_bytes(runtime, result);
2917         kfree(bufs);
2918  end:
2919         return result;
2920 }
2921
2922 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2923 {
2924         struct snd_pcm_file *pcm_file;
2925         struct snd_pcm_substream *substream;
2926         struct snd_pcm_runtime *runtime;
2927         unsigned int mask;
2928         snd_pcm_uframes_t avail;
2929
2930         pcm_file = file->private_data;
2931
2932         substream = pcm_file->substream;
2933         snd_assert(substream != NULL, return -ENXIO);
2934         runtime = substream->runtime;
2935
2936         poll_wait(file, &runtime->sleep, wait);
2937
2938         snd_pcm_stream_lock_irq(substream);
2939         avail = snd_pcm_playback_avail(runtime);
2940         switch (runtime->status->state) {
2941         case SNDRV_PCM_STATE_RUNNING:
2942         case SNDRV_PCM_STATE_PREPARED:
2943         case SNDRV_PCM_STATE_PAUSED:
2944                 if (avail >= runtime->control->avail_min) {
2945                         mask = POLLOUT | POLLWRNORM;
2946                         break;
2947                 }
2948                 /* Fall through */
2949         case SNDRV_PCM_STATE_DRAINING:
2950                 mask = 0;
2951                 break;
2952         default:
2953                 mask = POLLOUT | POLLWRNORM | POLLERR;
2954                 break;
2955         }
2956         snd_pcm_stream_unlock_irq(substream);
2957         return mask;
2958 }
2959
2960 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2961 {
2962         struct snd_pcm_file *pcm_file;
2963         struct snd_pcm_substream *substream;
2964         struct snd_pcm_runtime *runtime;
2965         unsigned int mask;
2966         snd_pcm_uframes_t avail;
2967
2968         pcm_file = file->private_data;
2969
2970         substream = pcm_file->substream;
2971         snd_assert(substream != NULL, return -ENXIO);
2972         runtime = substream->runtime;
2973
2974         poll_wait(file, &runtime->sleep, wait);
2975
2976         snd_pcm_stream_lock_irq(substream);
2977         avail = snd_pcm_capture_avail(runtime);
2978         switch (runtime->status->state) {
2979         case SNDRV_PCM_STATE_RUNNING:
2980         case SNDRV_PCM_STATE_PREPARED:
2981         case SNDRV_PCM_STATE_PAUSED:
2982                 if (avail >= runtime->control->avail_min) {
2983                         mask = POLLIN | POLLRDNORM;
2984                         break;
2985                 }
2986                 mask = 0;
2987                 break;
2988         case SNDRV_PCM_STATE_DRAINING:
2989                 if (avail > 0) {
2990                         mask = POLLIN | POLLRDNORM;
2991                         break;
2992                 }
2993                 /* Fall through */
2994         default:
2995                 mask = POLLIN | POLLRDNORM | POLLERR;
2996                 break;
2997         }
2998         snd_pcm_stream_unlock_irq(substream);
2999         return mask;
3000 }
3001
3002 /*
3003  * mmap support
3004  */
3005
3006 /*
3007  * Only on coherent architectures, we can mmap the status and the control records
3008  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3009  */
3010 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3011 /*
3012  * mmap status record
3013  */
3014 static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area,
3015                                                 unsigned long address, int *type)
3016 {
3017         struct snd_pcm_substream *substream = area->vm_private_data;
3018         struct snd_pcm_runtime *runtime;
3019         struct page * page;
3020
3021         if (substream == NULL)
3022                 return NOPAGE_SIGBUS;
3023         runtime = substream->runtime;
3024         page = virt_to_page(runtime->status);
3025         get_page(page);
3026         if (type)
3027                 *type = VM_FAULT_MINOR;
3028         return page;
3029 }
3030
3031 static struct vm_operations_struct snd_pcm_vm_ops_status =
3032 {
3033         .nopage =       snd_pcm_mmap_status_nopage,
3034 };
3035
3036 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3037                                struct vm_area_struct *area)
3038 {
3039         struct snd_pcm_runtime *runtime;
3040         long size;
3041         if (!(area->vm_flags & VM_READ))
3042                 return -EINVAL;
3043         runtime = substream->runtime;
3044         snd_assert(runtime != NULL, return -EAGAIN);
3045         size = area->vm_end - area->vm_start;
3046         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3047                 return -EINVAL;
3048         area->vm_ops = &snd_pcm_vm_ops_status;
3049         area->vm_private_data = substream;
3050         area->vm_flags |= VM_RESERVED;
3051         return 0;
3052 }
3053
3054 /*
3055  * mmap control record
3056  */
3057 static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area,
3058                                                  unsigned long address, int *type)
3059 {
3060         struct snd_pcm_substream *substream = area->vm_private_data;
3061         struct snd_pcm_runtime *runtime;
3062         struct page * page;
3063
3064         if (substream == NULL)
3065                 return NOPAGE_SIGBUS;
3066         runtime = substream->runtime;
3067         page = virt_to_page(runtime->control);
3068         get_page(page);
3069         if (type)
3070                 *type = VM_FAULT_MINOR;
3071         return page;
3072 }
3073
3074 static struct vm_operations_struct snd_pcm_vm_ops_control =
3075 {
3076         .nopage =       snd_pcm_mmap_control_nopage,
3077 };
3078
3079 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3080                                 struct vm_area_struct *area)
3081 {
3082         struct snd_pcm_runtime *runtime;
3083         long size;
3084         if (!(area->vm_flags & VM_READ))
3085                 return -EINVAL;
3086         runtime = substream->runtime;
3087         snd_assert(runtime != NULL, return -EAGAIN);
3088         size = area->vm_end - area->vm_start;
3089         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3090                 return -EINVAL;
3091         area->vm_ops = &snd_pcm_vm_ops_control;
3092         area->vm_private_data = substream;
3093         area->vm_flags |= VM_RESERVED;
3094         return 0;
3095 }
3096 #else /* ! coherent mmap */
3097 /*
3098  * don't support mmap for status and control records.
3099  */
3100 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3101                                struct vm_area_struct *area)
3102 {
3103         return -ENXIO;
3104 }
3105 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3106                                 struct vm_area_struct *area)
3107 {
3108         return -ENXIO;
3109 }
3110 #endif /* coherent mmap */
3111
3112 /*
3113  * nopage callback for mmapping a RAM page
3114  */
3115 static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area,
3116                                              unsigned long address, int *type)
3117 {
3118         struct snd_pcm_substream *substream = area->vm_private_data;
3119         struct snd_pcm_runtime *runtime;
3120         unsigned long offset;
3121         struct page * page;
3122         void *vaddr;
3123         size_t dma_bytes;
3124
3125         if (substream == NULL)
3126                 return NOPAGE_SIGBUS;
3127         runtime = substream->runtime;
3128         offset = area->vm_pgoff << PAGE_SHIFT;
3129         offset += address - area->vm_start;
3130         snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_SIGBUS);
3131         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3132         if (offset > dma_bytes - PAGE_SIZE)
3133                 return NOPAGE_SIGBUS;
3134         if (substream->ops->page) {
3135                 page = substream->ops->page(substream, offset);
3136                 if (! page)
3137                         return NOPAGE_OOM; /* XXX: is this really due to OOM? */
3138         } else {
3139                 vaddr = runtime->dma_area + offset;
3140                 page = virt_to_page(vaddr);
3141         }
3142         get_page(page);
3143         if (type)
3144                 *type = VM_FAULT_MINOR;
3145         return page;
3146 }
3147
3148 static struct vm_operations_struct snd_pcm_vm_ops_data =
3149 {
3150         .open =         snd_pcm_mmap_data_open,
3151         .close =        snd_pcm_mmap_data_close,
3152         .nopage =       snd_pcm_mmap_data_nopage,
3153 };
3154
3155 /*
3156  * mmap the DMA buffer on RAM
3157  */
3158 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3159                                 struct vm_area_struct *area)
3160 {
3161         area->vm_ops = &snd_pcm_vm_ops_data;
3162         area->vm_private_data = substream;
3163         area->vm_flags |= VM_RESERVED;
3164         atomic_inc(&substream->mmap_count);
3165         return 0;
3166 }
3167
3168 /*
3169  * mmap the DMA buffer on I/O memory area
3170  */
3171 #if SNDRV_PCM_INFO_MMAP_IOMEM
3172 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3173 {
3174         .open =         snd_pcm_mmap_data_open,
3175         .close =        snd_pcm_mmap_data_close,
3176 };
3177
3178 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3179                            struct vm_area_struct *area)
3180 {
3181         long size;
3182         unsigned long offset;
3183
3184 #ifdef pgprot_noncached
3185         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3186 #endif
3187         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3188         area->vm_private_data = substream;
3189         area->vm_flags |= VM_IO;
3190         size = area->vm_end - area->vm_start;
3191         offset = area->vm_pgoff << PAGE_SHIFT;
3192         if (io_remap_pfn_range(area, area->vm_start,
3193                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3194                                 size, area->vm_page_prot))
3195                 return -EAGAIN;
3196         atomic_inc(&substream->mmap_count);
3197         return 0;
3198 }
3199
3200 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3201 #endif /* SNDRV_PCM_INFO_MMAP */
3202
3203 /*
3204  * mmap DMA buffer
3205  */
3206 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3207                       struct vm_area_struct *area)
3208 {
3209         struct snd_pcm_runtime *runtime;
3210         long size;
3211         unsigned long offset;
3212         size_t dma_bytes;
3213
3214         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3215                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3216                         return -EINVAL;
3217         } else {
3218                 if (!(area->vm_flags & VM_READ))
3219                         return -EINVAL;
3220         }
3221         runtime = substream->runtime;
3222         snd_assert(runtime != NULL, return -EAGAIN);
3223         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3224                 return -EBADFD;
3225         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3226                 return -ENXIO;
3227         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3228             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3229                 return -EINVAL;
3230         size = area->vm_end - area->vm_start;
3231         offset = area->vm_pgoff << PAGE_SHIFT;
3232         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3233         if ((size_t)size > dma_bytes)
3234                 return -EINVAL;
3235         if (offset > dma_bytes - size)
3236                 return -EINVAL;
3237
3238         if (substream->ops->mmap)
3239                 return substream->ops->mmap(substream, area);
3240         else
3241                 return snd_pcm_default_mmap(substream, area);
3242 }
3243
3244 EXPORT_SYMBOL(snd_pcm_mmap_data);
3245
3246 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3247 {
3248         struct snd_pcm_file * pcm_file;
3249         struct snd_pcm_substream *substream;
3250         unsigned long offset;
3251
3252         pcm_file = file->private_data;
3253         substream = pcm_file->substream;
3254         snd_assert(substream != NULL, return -ENXIO);
3255
3256         offset = area->vm_pgoff << PAGE_SHIFT;
3257         switch (offset) {
3258         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3259                 if (pcm_file->no_compat_mmap)
3260                         return -ENXIO;
3261                 return snd_pcm_mmap_status(substream, file, area);
3262         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3263                 if (pcm_file->no_compat_mmap)
3264                         return -ENXIO;
3265                 return snd_pcm_mmap_control(substream, file, area);
3266         default:
3267                 return snd_pcm_mmap_data(substream, file, area);
3268         }
3269         return 0;
3270 }
3271
3272 static int snd_pcm_fasync(int fd, struct file * file, int on)
3273 {
3274         struct snd_pcm_file * pcm_file;
3275         struct snd_pcm_substream *substream;
3276         struct snd_pcm_runtime *runtime;
3277         int err;
3278
3279         pcm_file = file->private_data;
3280         substream = pcm_file->substream;
3281         snd_assert(substream != NULL, return -ENXIO);
3282         runtime = substream->runtime;
3283
3284         err = fasync_helper(fd, file, on, &runtime->fasync);
3285         if (err < 0)
3286                 return err;
3287         return 0;
3288 }
3289
3290 /*
3291  * ioctl32 compat
3292  */
3293 #ifdef CONFIG_COMPAT
3294 #include "pcm_compat.c"
3295 #else
3296 #define snd_pcm_ioctl_compat    NULL
3297 #endif
3298
3299 /*
3300  *  To be removed helpers to keep binary compatibility
3301  */
3302
3303 #ifdef CONFIG_SND_SUPPORT_OLD_API
3304 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3305 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3306
3307 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3308                                                struct snd_pcm_hw_params_old *oparams)
3309 {
3310         unsigned int i;
3311
3312         memset(params, 0, sizeof(*params));
3313         params->flags = oparams->flags;
3314         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3315                 params->masks[i].bits[0] = oparams->masks[i];
3316         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3317         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3318         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3319         params->info = oparams->info;
3320         params->msbits = oparams->msbits;
3321         params->rate_num = oparams->rate_num;
3322         params->rate_den = oparams->rate_den;
3323         params->fifo_size = oparams->fifo_size;
3324 }
3325
3326 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3327                                              struct snd_pcm_hw_params *params)
3328 {
3329         unsigned int i;
3330
3331         memset(oparams, 0, sizeof(*oparams));
3332         oparams->flags = params->flags;
3333         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3334                 oparams->masks[i] = params->masks[i].bits[0];
3335         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3336         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3337         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3338         oparams->info = params->info;
3339         oparams->msbits = params->msbits;
3340         oparams->rate_num = params->rate_num;
3341         oparams->rate_den = params->rate_den;
3342         oparams->fifo_size = params->fifo_size;
3343 }
3344
3345 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3346                                       struct snd_pcm_hw_params_old __user * _oparams)
3347 {
3348         struct snd_pcm_hw_params *params;
3349         struct snd_pcm_hw_params_old *oparams = NULL;
3350         int err;
3351
3352         params = kmalloc(sizeof(*params), GFP_KERNEL);
3353         if (!params) {
3354                 err = -ENOMEM;
3355                 goto out;
3356         }
3357         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3358         if (!oparams) {
3359                 err = -ENOMEM;
3360                 goto out;
3361         }
3362
3363         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3364                 err = -EFAULT;
3365                 goto out;
3366         }
3367         snd_pcm_hw_convert_from_old_params(params, oparams);
3368         err = snd_pcm_hw_refine(substream, params);
3369         snd_pcm_hw_convert_to_old_params(oparams, params);
3370         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3371                 if (!err)
3372                         err = -EFAULT;
3373         }
3374 out:
3375         kfree(params);
3376         kfree(oparams);
3377         return err;
3378 }
3379
3380 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3381                                       struct snd_pcm_hw_params_old __user * _oparams)
3382 {
3383         struct snd_pcm_hw_params *params;
3384         struct snd_pcm_hw_params_old *oparams = NULL;
3385         int err;
3386
3387         params = kmalloc(sizeof(*params), GFP_KERNEL);
3388         if (!params) {
3389                 err = -ENOMEM;
3390                 goto out;
3391         }
3392         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3393         if (!oparams) {
3394                 err = -ENOMEM;
3395                 goto out;
3396         }
3397         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3398                 err = -EFAULT;
3399                 goto out;
3400         }
3401         snd_pcm_hw_convert_from_old_params(params, oparams);
3402         err = snd_pcm_hw_params(substream, params);
3403         snd_pcm_hw_convert_to_old_params(oparams, params);
3404         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3405                 if (!err)
3406                         err = -EFAULT;
3407         }
3408 out:
3409         kfree(params);
3410         kfree(oparams);
3411         return err;
3412 }
3413 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3414
3415 /*
3416  *  Register section
3417  */
3418
3419 const struct file_operations snd_pcm_f_ops[2] = {
3420         {
3421                 .owner =                THIS_MODULE,
3422                 .write =                snd_pcm_write,
3423                 .aio_write =            snd_pcm_aio_write,
3424                 .open =                 snd_pcm_playback_open,
3425                 .release =              snd_pcm_release,
3426                 .poll =                 snd_pcm_playback_poll,
3427                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3428                 .compat_ioctl =         snd_pcm_ioctl_compat,
3429                 .mmap =                 snd_pcm_mmap,
3430                 .fasync =               snd_pcm_fasync,
3431         },
3432         {
3433                 .owner =                THIS_MODULE,
3434                 .read =                 snd_pcm_read,
3435                 .aio_read =             snd_pcm_aio_read,
3436                 .open =                 snd_pcm_capture_open,
3437                 .release =              snd_pcm_release,
3438                 .poll =                 snd_pcm_capture_poll,
3439                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3440                 .compat_ioctl =         snd_pcm_ioctl_compat,
3441                 .mmap =                 snd_pcm_mmap,
3442                 .fasync =               snd_pcm_fasync,
3443         }
3444 };