git.oblomov.eu Git - linux-2.6/blob - sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/mm.h>
  24 #include <linux/file.h>
  25 #include <linux/slab.h>
  26 #include <linux/time.h>
  27 #include <linux/latency.h>
  28 #include <linux/uio.h>
  29 #include <sound/core.h>
  30 #include <sound/control.h>
  31 #include <sound/info.h>
  32 #include <sound/pcm.h>
  33 #include <sound/pcm_params.h>
  34 #include <sound/timer.h>
  35 #include <sound/minors.h>
  36 #include <asm/io.h>
  37
  38 /*
  39  *  Compatibility
  40  */
  41
  42 struct snd_pcm_hw_params_old {
  43         unsigned int flags;
  44         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  45                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  46         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  47                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  48         unsigned int rmask;
  49         unsigned int cmask;
  50         unsigned int info;
  51         unsigned int msbits;
  52         unsigned int rate_num;
  53         unsigned int rate_den;
  54         snd_pcm_uframes_t fifo_size;
  55         unsigned char reserved[64];
  56 };
  57
  58 #ifdef CONFIG_SND_SUPPORT_OLD_API
  59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  61
  62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  63                                       struct snd_pcm_hw_params_old __user * _oparams);
  64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 #endif
  67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  68
  69 /*
  70  *
  71  */
  72
  73 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  74 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  75
  76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  77
  78 static inline mm_segment_t snd_enter_user(void)
  79 {
  80         mm_segment_t fs = get_fs();
  81         set_fs(get_ds());
  82         return fs;
  83 }
  84
  85 static inline void snd_leave_user(mm_segment_t fs)
  86 {
  87         set_fs(fs);
  88 }
  89
  90
  91
  92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  93 {
  94         struct snd_pcm_runtime *runtime;
  95         struct snd_pcm *pcm = substream->pcm;
  96         struct snd_pcm_str *pstr = substream->pstr;
  97
  98         snd_assert(substream != NULL, return -ENXIO);
  99         memset(info, 0, sizeof(*info));
 100         info->card = pcm->card->number;
 101         info->device = pcm->device;
 102         info->stream = substream->stream;
 103         info->subdevice = substream->number;
 104         strlcpy(info->id, pcm->id, sizeof(info->id));
 105         strlcpy(info->name, pcm->name, sizeof(info->name));
 106         info->dev_class = pcm->dev_class;
 107         info->dev_subclass = pcm->dev_subclass;
 108         info->subdevices_count = pstr->substream_count;
 109         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 110         strlcpy(info->subname, substream->name, sizeof(info->subname));
 111         runtime = substream->runtime;
 112         /* AB: FIXME!!! This is definitely nonsense */
 113         if (runtime) {
 114                 info->sync = runtime->sync;
 115                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 116         }
 117         return 0;
 118 }
 119
 120 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 121                       struct snd_pcm_info __user * _info)
 122 {
 123         struct snd_pcm_info *info;
 124         int err;
 125
 126         info = kmalloc(sizeof(*info), GFP_KERNEL);
 127         if (! info)
 128                 return -ENOMEM;
 129         err = snd_pcm_info(substream, info);
 130         if (err >= 0) {
 131                 if (copy_to_user(_info, info, sizeof(*info)))
 132                         err = -EFAULT;
 133         }
 134         kfree(info);
 135         return err;
 136 }
 137
 138 #undef RULES_DEBUG
 139
 140 #ifdef RULES_DEBUG
 141 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 142 char *snd_pcm_hw_param_names[] = {
 143         HW_PARAM(ACCESS),
 144         HW_PARAM(FORMAT),
 145         HW_PARAM(SUBFORMAT),
 146         HW_PARAM(SAMPLE_BITS),
 147         HW_PARAM(FRAME_BITS),
 148         HW_PARAM(CHANNELS),
 149         HW_PARAM(RATE),
 150         HW_PARAM(PERIOD_TIME),
 151         HW_PARAM(PERIOD_SIZE),
 152         HW_PARAM(PERIOD_BYTES),
 153         HW_PARAM(PERIODS),
 154         HW_PARAM(BUFFER_TIME),
 155         HW_PARAM(BUFFER_SIZE),
 156         HW_PARAM(BUFFER_BYTES),
 157         HW_PARAM(TICK_TIME),
 158 };
 159 #endif
 160
 161 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 162                       struct snd_pcm_hw_params *params)
 163 {
 164         unsigned int k;
 165         struct snd_pcm_hardware *hw;
 166         struct snd_interval *i = NULL;
 167         struct snd_mask *m = NULL;
 168         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 169         unsigned int rstamps[constrs->rules_num];
 170         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 171         unsigned int stamp = 2;
 172         int changed, again;
 173
 174         params->info = 0;
 175         params->fifo_size = 0;
 176         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 177                 params->msbits = 0;
 178         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 179                 params->rate_num = 0;
 180                 params->rate_den = 0;
 181         }
 182
 183         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 184                 m = hw_param_mask(params, k);
 185                 if (snd_mask_empty(m))
 186                         return -EINVAL;
 187                 if (!(params->rmask & (1 << k)))
 188                         continue;
 189 #ifdef RULES_DEBUG
 190                 printk("%s = ", snd_pcm_hw_param_names[k]);
 191                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 192 #endif
 193                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 194 #ifdef RULES_DEBUG
 195                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 196 #endif
 197                 if (changed)
 198                         params->cmask |= 1 << k;
 199                 if (changed < 0)
 200                         return changed;
 201         }
 202
 203         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 204                 i = hw_param_interval(params, k);
 205                 if (snd_interval_empty(i))
 206                         return -EINVAL;
 207                 if (!(params->rmask & (1 << k)))
 208                         continue;
 209 #ifdef RULES_DEBUG
 210                 printk("%s = ", snd_pcm_hw_param_names[k]);
 211                 if (i->empty)
 212                         printk("empty");
 213                 else
 214                         printk("%c%u %u%c",
 215                                i->openmin ? '(' : '[', i->min,
 216                                i->max, i->openmax ? ')' : ']');
 217                 printk(" -> ");
 218 #endif
 219                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 220 #ifdef RULES_DEBUG
 221                 if (i->empty)
 222                         printk("empty\n");
 223                 else
 224                         printk("%c%u %u%c\n",
 225                                i->openmin ? '(' : '[', i->min,
 226                                i->max, i->openmax ? ')' : ']');
 227 #endif
 228                 if (changed)
 229                         params->cmask |= 1 << k;
 230                 if (changed < 0)
 231                         return changed;
 232         }
 233
 234         for (k = 0; k < constrs->rules_num; k++)
 235                 rstamps[k] = 0;
 236         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 237                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 238         do {
 239                 again = 0;
 240                 for (k = 0; k < constrs->rules_num; k++) {
 241                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 242                         unsigned int d;
 243                         int doit = 0;
 244                         if (r->cond && !(r->cond & params->flags))
 245                                 continue;
 246                         for (d = 0; r->deps[d] >= 0; d++) {
 247                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 248                                         doit = 1;
 249                                         break;
 250                                 }
 251                         }
 252                         if (!doit)
 253                                 continue;
 254 #ifdef RULES_DEBUG
 255                         printk("Rule %d [%p]: ", k, r->func);
 256                         if (r->var >= 0) {
 257                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 258                                 if (hw_is_mask(r->var)) {
 259                                         m = hw_param_mask(params, r->var);
 260                                         printk("%x", *m->bits);
 261                                 } else {
 262                                         i = hw_param_interval(params, r->var);
 263                                         if (i->empty)
 264                                                 printk("empty");
 265                                         else
 266                                                 printk("%c%u %u%c",
 267                                                        i->openmin ? '(' : '[', i->min,
 268                                                        i->max, i->openmax ? ')' : ']');
 269                                 }
 270                         }
 271 #endif
 272                         changed = r->func(params, r);
 273 #ifdef RULES_DEBUG
 274                         if (r->var >= 0) {
 275                                 printk(" -> ");
 276                                 if (hw_is_mask(r->var))
 277                                         printk("%x", *m->bits);
 278                                 else {
 279                                         if (i->empty)
 280                                                 printk("empty");
 281                                         else
 282                                                 printk("%c%u %u%c",
 283                                                        i->openmin ? '(' : '[', i->min,
 284                                                        i->max, i->openmax ? ')' : ']');
 285                                 }
 286                         }
 287                         printk("\n");
 288 #endif
 289                         rstamps[k] = stamp;
 290                         if (changed && r->var >= 0) {
 291                                 params->cmask |= (1 << r->var);
 292                                 vstamps[r->var] = stamp;
 293                                 again = 1;
 294                         }
 295                         if (changed < 0)
 296                                 return changed;
 297                         stamp++;
 298                 }
 299         } while (again);
 300         if (!params->msbits) {
 301                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 302                 if (snd_interval_single(i))
 303                         params->msbits = snd_interval_value(i);
 304         }
 305
 306         if (!params->rate_den) {
 307                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 308                 if (snd_interval_single(i)) {
 309                         params->rate_num = snd_interval_value(i);
 310                         params->rate_den = 1;
 311                 }
 312         }
 313
 314         hw = &substream->runtime->hw;
 315         if (!params->info)
 316                 params->info = hw->info;
 317         if (!params->fifo_size)
 318                 params->fifo_size = hw->fifo_size;
 319         params->rmask = 0;
 320         return 0;
 321 }
 322
 323 EXPORT_SYMBOL(snd_pcm_hw_refine);
 324
 325 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 326                                   struct snd_pcm_hw_params __user * _params)
 327 {
 328         struct snd_pcm_hw_params *params;
 329         int err;
 330
 331         params = kmalloc(sizeof(*params), GFP_KERNEL);
 332         if (!params) {
 333                 err = -ENOMEM;
 334                 goto out;
 335         }
 336         if (copy_from_user(params, _params, sizeof(*params))) {
 337                 err = -EFAULT;
 338                 goto out;
 339         }
 340         err = snd_pcm_hw_refine(substream, params);
 341         if (copy_to_user(_params, params, sizeof(*params))) {
 342                 if (!err)
 343                         err = -EFAULT;
 344         }
 345 out:
 346         kfree(params);
 347         return err;
 348 }
 349
 350 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 351 {
 352         int usecs;
 353
 354         if (! runtime->rate)
 355                 return -1; /* invalid */
 356
 357         /* take 75% of period time as the deadline */
 358         usecs = (750000 / runtime->rate) * runtime->period_size;
 359         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 360                 runtime->rate;
 361
 362         return usecs;
 363 }
 364
 365 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 366                              struct snd_pcm_hw_params *params)
 367 {
 368         struct snd_pcm_runtime *runtime;
 369         int err, usecs;
 370         unsigned int bits;
 371         snd_pcm_uframes_t frames;
 372
 373         snd_assert(substream != NULL, return -ENXIO);
 374         runtime = substream->runtime;
 375         snd_assert(runtime != NULL, return -ENXIO);
 376         snd_pcm_stream_lock_irq(substream);
 377         switch (runtime->status->state) {
 378         case SNDRV_PCM_STATE_OPEN:
 379         case SNDRV_PCM_STATE_SETUP:
 380         case SNDRV_PCM_STATE_PREPARED:
 381                 break;
 382         default:
 383                 snd_pcm_stream_unlock_irq(substream);
 384                 return -EBADFD;
 385         }
 386         snd_pcm_stream_unlock_irq(substream);
 387 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 388         if (!substream->oss.oss)
 389 #endif
 390                 if (atomic_read(&substream->mmap_count))
 391                         return -EBADFD;
 392
 393         params->rmask = ~0U;
 394         err = snd_pcm_hw_refine(substream, params);
 395         if (err < 0)
 396                 goto _error;
 397
 398         err = snd_pcm_hw_params_choose(substream, params);
 399         if (err < 0)
 400                 goto _error;
 401
 402         if (substream->ops->hw_params != NULL) {
 403                 err = substream->ops->hw_params(substream, params);
 404                 if (err < 0)
 405                         goto _error;
 406         }
 407
 408         runtime->access = params_access(params);
 409         runtime->format = params_format(params);
 410         runtime->subformat = params_subformat(params);
 411         runtime->channels = params_channels(params);
 412         runtime->rate = params_rate(params);
 413         runtime->period_size = params_period_size(params);
 414         runtime->periods = params_periods(params);
 415         runtime->buffer_size = params_buffer_size(params);
 416         runtime->tick_time = params_tick_time(params);
 417         runtime->info = params->info;
 418         runtime->rate_num = params->rate_num;
 419         runtime->rate_den = params->rate_den;
 420
 421         bits = snd_pcm_format_physical_width(runtime->format);
 422         runtime->sample_bits = bits;
 423         bits *= runtime->channels;
 424         runtime->frame_bits = bits;
 425         frames = 1;
 426         while (bits % 8 != 0) {
 427                 bits *= 2;
 428                 frames *= 2;
 429         }
 430         runtime->byte_align = bits / 8;
 431         runtime->min_align = frames;
 432
 433         /* Default sw params */
 434         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 435         runtime->period_step = 1;
 436         runtime->sleep_min = 0;
 437         runtime->control->avail_min = runtime->period_size;
 438         runtime->xfer_align = runtime->period_size;
 439         runtime->start_threshold = 1;
 440         runtime->stop_threshold = runtime->buffer_size;
 441         runtime->silence_threshold = 0;
 442         runtime->silence_size = 0;
 443         runtime->boundary = runtime->buffer_size;
 444         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 445                 runtime->boundary *= 2;
 446
 447         snd_pcm_timer_resolution_change(substream);
 448         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 449
 450         remove_acceptable_latency(substream->latency_id);
 451         if ((usecs = period_to_usecs(runtime)) >= 0)
 452                 set_acceptable_latency(substream->latency_id, usecs);
 453         return 0;
 454  _error:
 455         /* hardware might be unuseable from this time,
 456            so we force application to retry to set
 457            the correct hardware parameter settings */
 458         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 459         if (substream->ops->hw_free != NULL)
 460                 substream->ops->hw_free(substream);
 461         return err;
 462 }
 463
 464 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 465                                   struct snd_pcm_hw_params __user * _params)
 466 {
 467         struct snd_pcm_hw_params *params;
 468         int err;
 469
 470         params = kmalloc(sizeof(*params), GFP_KERNEL);
 471         if (!params) {
 472                 err = -ENOMEM;
 473                 goto out;
 474         }
 475         if (copy_from_user(params, _params, sizeof(*params))) {
 476                 err = -EFAULT;
 477                 goto out;
 478         }
 479         err = snd_pcm_hw_params(substream, params);
 480         if (copy_to_user(_params, params, sizeof(*params))) {
 481                 if (!err)
 482                         err = -EFAULT;
 483         }
 484 out:
 485         kfree(params);
 486         return err;
 487 }
 488
 489 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 490 {
 491         struct snd_pcm_runtime *runtime;
 492         int result = 0;
 493
 494         snd_assert(substream != NULL, return -ENXIO);
 495         runtime = substream->runtime;
 496         snd_assert(runtime != NULL, return -ENXIO);
 497         snd_pcm_stream_lock_irq(substream);
 498         switch (runtime->status->state) {
 499         case SNDRV_PCM_STATE_SETUP:
 500         case SNDRV_PCM_STATE_PREPARED:
 501                 break;
 502         default:
 503                 snd_pcm_stream_unlock_irq(substream);
 504                 return -EBADFD;
 505         }
 506         snd_pcm_stream_unlock_irq(substream);
 507         if (atomic_read(&substream->mmap_count))
 508                 return -EBADFD;
 509         if (substream->ops->hw_free)
 510                 result = substream->ops->hw_free(substream);
 511         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 512         remove_acceptable_latency(substream->latency_id);
 513         return result;
 514 }
 515
 516 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 517                              struct snd_pcm_sw_params *params)
 518 {
 519         struct snd_pcm_runtime *runtime;
 520
 521         snd_assert(substream != NULL, return -ENXIO);
 522         runtime = substream->runtime;
 523         snd_assert(runtime != NULL, return -ENXIO);
 524         snd_pcm_stream_lock_irq(substream);
 525         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 526                 snd_pcm_stream_unlock_irq(substream);
 527                 return -EBADFD;
 528         }
 529         snd_pcm_stream_unlock_irq(substream);
 530
 531         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 532                 return -EINVAL;
 533         if (params->avail_min == 0)
 534                 return -EINVAL;
 535         if (params->xfer_align == 0 ||
 536             params->xfer_align % runtime->min_align != 0)
 537                 return -EINVAL;
 538         if (params->silence_size >= runtime->boundary) {
 539                 if (params->silence_threshold != 0)
 540                         return -EINVAL;
 541         } else {
 542                 if (params->silence_size > params->silence_threshold)
 543                         return -EINVAL;
 544                 if (params->silence_threshold > runtime->buffer_size)
 545                         return -EINVAL;
 546         }
 547         snd_pcm_stream_lock_irq(substream);
 548         runtime->tstamp_mode = params->tstamp_mode;
 549         runtime->sleep_min = params->sleep_min;
 550         runtime->period_step = params->period_step;
 551         runtime->control->avail_min = params->avail_min;
 552         runtime->start_threshold = params->start_threshold;
 553         runtime->stop_threshold = params->stop_threshold;
 554         runtime->silence_threshold = params->silence_threshold;
 555         runtime->silence_size = params->silence_size;
 556         runtime->xfer_align = params->xfer_align;
 557         params->boundary = runtime->boundary;
 558         if (snd_pcm_running(substream)) {
 559                 if (runtime->sleep_min)
 560                         snd_pcm_tick_prepare(substream);
 561                 else
 562                         snd_pcm_tick_set(substream, 0);
 563                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 564                     runtime->silence_size > 0)
 565                         snd_pcm_playback_silence(substream, ULONG_MAX);
 566                 wake_up(&runtime->sleep);
 567         }
 568         snd_pcm_stream_unlock_irq(substream);
 569         return 0;
 570 }
 571
 572 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 573                                   struct snd_pcm_sw_params __user * _params)
 574 {
 575         struct snd_pcm_sw_params params;
 576         int err;
 577         if (copy_from_user(&params, _params, sizeof(params)))
 578                 return -EFAULT;
 579         err = snd_pcm_sw_params(substream, &params);
 580         if (copy_to_user(_params, &params, sizeof(params)))
 581                 return -EFAULT;
 582         return err;
 583 }
 584
 585 int snd_pcm_status(struct snd_pcm_substream *substream,
 586                    struct snd_pcm_status *status)
 587 {
 588         struct snd_pcm_runtime *runtime = substream->runtime;
 589
 590         snd_pcm_stream_lock_irq(substream);
 591         status->state = runtime->status->state;
 592         status->suspended_state = runtime->status->suspended_state;
 593         if (status->state == SNDRV_PCM_STATE_OPEN)
 594                 goto _end;
 595         status->trigger_tstamp = runtime->trigger_tstamp;
 596         if (snd_pcm_running(substream)) {
 597                 snd_pcm_update_hw_ptr(substream);
 598                 if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
 599                         status->tstamp = runtime->status->tstamp;
 600                 else
 601                         getnstimeofday(&status->tstamp);
 602         } else
 603                 getnstimeofday(&status->tstamp);
 604         status->appl_ptr = runtime->control->appl_ptr;
 605         status->hw_ptr = runtime->status->hw_ptr;
 606         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 607                 status->avail = snd_pcm_playback_avail(runtime);
 608                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 609                     runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 610                         status->delay = runtime->buffer_size - status->avail;
 611                 else
 612                         status->delay = 0;
 613         } else {
 614                 status->avail = snd_pcm_capture_avail(runtime);
 615                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 616                         status->delay = status->avail;
 617                 else
 618                         status->delay = 0;
 619         }
 620         status->avail_max = runtime->avail_max;
 621         status->overrange = runtime->overrange;
 622         runtime->avail_max = 0;
 623         runtime->overrange = 0;
 624  _end:
 625         snd_pcm_stream_unlock_irq(substream);
 626         return 0;
 627 }
 628
 629 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 630                                struct snd_pcm_status __user * _status)
 631 {
 632         struct snd_pcm_status status;
 633         struct snd_pcm_runtime *runtime;
 634         int res;
 635
 636         snd_assert(substream != NULL, return -ENXIO);
 637         runtime = substream->runtime;
 638         memset(&status, 0, sizeof(status));
 639         res = snd_pcm_status(substream, &status);
 640         if (res < 0)
 641                 return res;
 642         if (copy_to_user(_status, &status, sizeof(status)))
 643                 return -EFAULT;
 644         return 0;
 645 }
 646
 647 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 648                                 struct snd_pcm_channel_info * info)
 649 {
 650         struct snd_pcm_runtime *runtime;
 651         unsigned int channel;
 652
 653         snd_assert(substream != NULL, return -ENXIO);
 654         channel = info->channel;
 655         runtime = substream->runtime;
 656         snd_pcm_stream_lock_irq(substream);
 657         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 658                 snd_pcm_stream_unlock_irq(substream);
 659                 return -EBADFD;
 660         }
 661         snd_pcm_stream_unlock_irq(substream);
 662         if (channel >= runtime->channels)
 663                 return -EINVAL;
 664         memset(info, 0, sizeof(*info));
 665         info->channel = channel;
 666         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 667 }
 668
 669 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 670                                      struct snd_pcm_channel_info __user * _info)
 671 {
 672         struct snd_pcm_channel_info info;
 673         int res;
 674
 675         if (copy_from_user(&info, _info, sizeof(info)))
 676                 return -EFAULT;
 677         res = snd_pcm_channel_info(substream, &info);
 678         if (res < 0)
 679                 return res;
 680         if (copy_to_user(_info, &info, sizeof(info)))
 681                 return -EFAULT;
 682         return 0;
 683 }
 684
 685 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 686 {
 687         struct snd_pcm_runtime *runtime = substream->runtime;
 688         if (runtime->trigger_master == NULL)
 689                 return;
 690         if (runtime->trigger_master == substream) {
 691                 getnstimeofday(&runtime->trigger_tstamp);
 692         } else {
 693                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 694                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 695         }
 696         runtime->trigger_master = NULL;
 697 }
 698
 699 struct action_ops {
 700         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 701         int (*do_action)(struct snd_pcm_substream *substream, int state);
 702         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 703         void (*post_action)(struct snd_pcm_substream *substream, int state);
 704 };
 705
 706 /*
 707  *  this functions is core for handling of linked stream
 708  *  Note: the stream state might be changed also on failure
 709  *  Note2: call with calling stream lock + link lock
 710  */
 711 static int snd_pcm_action_group(struct action_ops *ops,
 712                                 struct snd_pcm_substream *substream,
 713                                 int state, int do_lock)
 714 {
 715         struct snd_pcm_substream *s = NULL;
 716         struct snd_pcm_substream *s1;
 717         int res = 0;
 718
 719         snd_pcm_group_for_each_entry(s, substream) {
 720                 if (do_lock && s != substream)
 721                         spin_lock_nested(&s->self_group.lock,
 722                                          SINGLE_DEPTH_NESTING);
 723                 res = ops->pre_action(s, state);
 724                 if (res < 0)
 725                         goto _unlock;
 726         }
 727         snd_pcm_group_for_each_entry(s, substream) {
 728                 res = ops->do_action(s, state);
 729                 if (res < 0) {
 730                         if (ops->undo_action) {
 731                                 snd_pcm_group_for_each_entry(s1, substream) {
 732                                         if (s1 == s) /* failed stream */
 733                                                 break;
 734                                         ops->undo_action(s1, state);
 735                                 }
 736                         }
 737                         s = NULL; /* unlock all */
 738                         goto _unlock;
 739                 }
 740         }
 741         snd_pcm_group_for_each_entry(s, substream) {
 742                 ops->post_action(s, state);
 743         }
 744  _unlock:
 745         if (do_lock) {
 746                 /* unlock streams */
 747                 snd_pcm_group_for_each_entry(s1, substream) {
 748                         if (s1 != substream)
 749                                 spin_unlock(&s1->self_group.lock);
 750                         if (s1 == s)    /* end */
 751                                 break;
 752                 }
 753         }
 754         return res;
 755 }
 756
 757 /*
 758  *  Note: call with stream lock
 759  */
 760 static int snd_pcm_action_single(struct action_ops *ops,
 761                                  struct snd_pcm_substream *substream,
 762                                  int state)
 763 {
 764         int res;
 765
 766         res = ops->pre_action(substream, state);
 767         if (res < 0)
 768                 return res;
 769         res = ops->do_action(substream, state);
 770         if (res == 0)
 771                 ops->post_action(substream, state);
 772         else if (ops->undo_action)
 773                 ops->undo_action(substream, state);
 774         return res;
 775 }
 776
 777 /*
 778  *  Note: call with stream lock
 779  */
 780 static int snd_pcm_action(struct action_ops *ops,
 781                           struct snd_pcm_substream *substream,
 782                           int state)
 783 {
 784         int res;
 785
 786         if (snd_pcm_stream_linked(substream)) {
 787                 if (!spin_trylock(&substream->group->lock)) {
 788                         spin_unlock(&substream->self_group.lock);
 789                         spin_lock(&substream->group->lock);
 790                         spin_lock(&substream->self_group.lock);
 791                 }
 792                 res = snd_pcm_action_group(ops, substream, state, 1);
 793                 spin_unlock(&substream->group->lock);
 794         } else {
 795                 res = snd_pcm_action_single(ops, substream, state);
 796         }
 797         return res;
 798 }
 799
 800 /*
 801  *  Note: don't use any locks before
 802  */
 803 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 804                                    struct snd_pcm_substream *substream,
 805                                    int state)
 806 {
 807         int res;
 808
 809         read_lock_irq(&snd_pcm_link_rwlock);
 810         if (snd_pcm_stream_linked(substream)) {
 811                 spin_lock(&substream->group->lock);
 812                 spin_lock(&substream->self_group.lock);
 813                 res = snd_pcm_action_group(ops, substream, state, 1);
 814                 spin_unlock(&substream->self_group.lock);
 815                 spin_unlock(&substream->group->lock);
 816         } else {
 817                 spin_lock(&substream->self_group.lock);
 818                 res = snd_pcm_action_single(ops, substream, state);
 819                 spin_unlock(&substream->self_group.lock);
 820         }
 821         read_unlock_irq(&snd_pcm_link_rwlock);
 822         return res;
 823 }
 824
 825 /*
 826  */
 827 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 828                                     struct snd_pcm_substream *substream,
 829                                     int state)
 830 {
 831         int res;
 832
 833         down_read(&snd_pcm_link_rwsem);
 834         if (snd_pcm_stream_linked(substream))
 835                 res = snd_pcm_action_group(ops, substream, state, 0);
 836         else
 837                 res = snd_pcm_action_single(ops, substream, state);
 838         up_read(&snd_pcm_link_rwsem);
 839         return res;
 840 }
 841
 842 /*
 843  * start callbacks
 844  */
 845 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 846 {
 847         struct snd_pcm_runtime *runtime = substream->runtime;
 848         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 849                 return -EBADFD;
 850         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 851             !snd_pcm_playback_data(substream))
 852                 return -EPIPE;
 853         runtime->trigger_master = substream;
 854         return 0;
 855 }
 856
 857 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 858 {
 859         if (substream->runtime->trigger_master != substream)
 860                 return 0;
 861         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 862 }
 863
 864 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 865 {
 866         if (substream->runtime->trigger_master == substream)
 867                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 868 }
 869
 870 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 871 {
 872         struct snd_pcm_runtime *runtime = substream->runtime;
 873         snd_pcm_trigger_tstamp(substream);
 874         runtime->status->state = state;
 875         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 876             runtime->silence_size > 0)
 877                 snd_pcm_playback_silence(substream, ULONG_MAX);
 878         if (runtime->sleep_min)
 879                 snd_pcm_tick_prepare(substream);
 880         if (substream->timer)
 881                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 882                                  &runtime->trigger_tstamp);
 883 }
 884
 885 static struct action_ops snd_pcm_action_start = {
 886         .pre_action = snd_pcm_pre_start,
 887         .do_action = snd_pcm_do_start,
 888         .undo_action = snd_pcm_undo_start,
 889         .post_action = snd_pcm_post_start
 890 };
 891
 892 /**
 893  * snd_pcm_start
 894  * @substream: the PCM substream instance
 895  *
 896  * Start all linked streams.
 897  */
 898 int snd_pcm_start(struct snd_pcm_substream *substream)
 899 {
 900         return snd_pcm_action(&snd_pcm_action_start, substream,
 901                               SNDRV_PCM_STATE_RUNNING);
 902 }
 903
 904 /*
 905  * stop callbacks
 906  */
 907 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 908 {
 909         struct snd_pcm_runtime *runtime = substream->runtime;
 910         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 911                 return -EBADFD;
 912         runtime->trigger_master = substream;
 913         return 0;
 914 }
 915
 916 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 917 {
 918         if (substream->runtime->trigger_master == substream &&
 919             snd_pcm_running(substream))
 920                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 921         return 0; /* unconditonally stop all substreams */
 922 }
 923
 924 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 925 {
 926         struct snd_pcm_runtime *runtime = substream->runtime;
 927         if (runtime->status->state != state) {
 928                 snd_pcm_trigger_tstamp(substream);
 929                 if (substream->timer)
 930                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 931                                          &runtime->trigger_tstamp);
 932                 runtime->status->state = state;
 933                 snd_pcm_tick_set(substream, 0);
 934         }
 935         wake_up(&runtime->sleep);
 936 }
 937
 938 static struct action_ops snd_pcm_action_stop = {
 939         .pre_action = snd_pcm_pre_stop,
 940         .do_action = snd_pcm_do_stop,
 941         .post_action = snd_pcm_post_stop
 942 };
 943
 944 /**
 945  * snd_pcm_stop
 946  * @substream: the PCM substream instance
 947  * @state: PCM state after stopping the stream
 948  *
 949  * Try to stop all running streams in the substream group.
 950  * The state of each stream is changed to the given value after that unconditionally.
 951  */
 952 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 953 {
 954         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 955 }
 956
 957 EXPORT_SYMBOL(snd_pcm_stop);
 958
 959 /**
 960  * snd_pcm_drain_done
 961  * @substream: the PCM substream
 962  *
 963  * Stop the DMA only when the given stream is playback.
 964  * The state is changed to SETUP.
 965  * Unlike snd_pcm_stop(), this affects only the given stream.
 966  */
 967 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 968 {
 969         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 970                                      SNDRV_PCM_STATE_SETUP);
 971 }
 972
 973 /*
 974  * pause callbacks
 975  */
 976 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 977 {
 978         struct snd_pcm_runtime *runtime = substream->runtime;
 979         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 980                 return -ENOSYS;
 981         if (push) {
 982                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 983                         return -EBADFD;
 984         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 985                 return -EBADFD;
 986         runtime->trigger_master = substream;
 987         return 0;
 988 }
 989
 990 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 991 {
 992         if (substream->runtime->trigger_master != substream)
 993                 return 0;
 994         return substream->ops->trigger(substream,
 995                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 996                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 997 }
 998
 999 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1000 {
1001         if (substream->runtime->trigger_master == substream)
1002                 substream->ops->trigger(substream,
1003                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1004                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1005 }
1006
1007 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1008 {
1009         struct snd_pcm_runtime *runtime = substream->runtime;
1010         snd_pcm_trigger_tstamp(substream);
1011         if (push) {
1012                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1013                 if (substream->timer)
1014                         snd_timer_notify(substream->timer,
1015                                          SNDRV_TIMER_EVENT_MPAUSE,
1016                                          &runtime->trigger_tstamp);
1017                 snd_pcm_tick_set(substream, 0);
1018                 wake_up(&runtime->sleep);
1019         } else {
1020                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1021                 if (runtime->sleep_min)
1022                         snd_pcm_tick_prepare(substream);
1023                 if (substream->timer)
1024                         snd_timer_notify(substream->timer,
1025                                          SNDRV_TIMER_EVENT_MCONTINUE,
1026                                          &runtime->trigger_tstamp);
1027         }
1028 }
1029
1030 static struct action_ops snd_pcm_action_pause = {
1031         .pre_action = snd_pcm_pre_pause,
1032         .do_action = snd_pcm_do_pause,
1033         .undo_action = snd_pcm_undo_pause,
1034         .post_action = snd_pcm_post_pause
1035 };
1036
1037 /*
1038  * Push/release the pause for all linked streams.
1039  */
1040 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1041 {
1042         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1043 }
1044
1045 #ifdef CONFIG_PM
1046 /* suspend */
1047
1048 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1049 {
1050         struct snd_pcm_runtime *runtime = substream->runtime;
1051         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1052                 return -EBUSY;
1053         runtime->trigger_master = substream;
1054         return 0;
1055 }
1056
1057 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1058 {
1059         struct snd_pcm_runtime *runtime = substream->runtime;
1060         if (runtime->trigger_master != substream)
1061                 return 0;
1062         if (! snd_pcm_running(substream))
1063                 return 0;
1064         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1065         return 0; /* suspend unconditionally */
1066 }
1067
1068 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1069 {
1070         struct snd_pcm_runtime *runtime = substream->runtime;
1071         snd_pcm_trigger_tstamp(substream);
1072         if (substream->timer)
1073                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1074                                  &runtime->trigger_tstamp);
1075         runtime->status->suspended_state = runtime->status->state;
1076         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1077         snd_pcm_tick_set(substream, 0);
1078         wake_up(&runtime->sleep);
1079 }
1080
1081 static struct action_ops snd_pcm_action_suspend = {
1082         .pre_action = snd_pcm_pre_suspend,
1083         .do_action = snd_pcm_do_suspend,
1084         .post_action = snd_pcm_post_suspend
1085 };
1086
1087 /**
1088  * snd_pcm_suspend
1089  * @substream: the PCM substream
1090  *
1091  * Trigger SUSPEND to all linked streams.
1092  * After this call, all streams are changed to SUSPENDED state.
1093  */
1094 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1095 {
1096         int err;
1097         unsigned long flags;
1098
1099         if (! substream)
1100                 return 0;
1101
1102         snd_pcm_stream_lock_irqsave(substream, flags);
1103         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1104         snd_pcm_stream_unlock_irqrestore(substream, flags);
1105         return err;
1106 }
1107
1108 EXPORT_SYMBOL(snd_pcm_suspend);
1109
1110 /**
1111  * snd_pcm_suspend_all
1112  * @pcm: the PCM instance
1113  *
1114  * Trigger SUSPEND to all substreams in the given pcm.
1115  * After this call, all streams are changed to SUSPENDED state.
1116  */
1117 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1118 {
1119         struct snd_pcm_substream *substream;
1120         int stream, err = 0;
1121
1122         if (! pcm)
1123                 return 0;
1124
1125         for (stream = 0; stream < 2; stream++) {
1126                 for (substream = pcm->streams[stream].substream;
1127                      substream; substream = substream->next) {
1128                         /* FIXME: the open/close code should lock this as well */
1129                         if (substream->runtime == NULL)
1130                                 continue;
1131                         err = snd_pcm_suspend(substream);
1132                         if (err < 0 && err != -EBUSY)
1133                                 return err;
1134                 }
1135         }
1136         return 0;
1137 }
1138
1139 EXPORT_SYMBOL(snd_pcm_suspend_all);
1140
1141 /* resume */
1142
1143 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1144 {
1145         struct snd_pcm_runtime *runtime = substream->runtime;
1146         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1147                 return -ENOSYS;
1148         runtime->trigger_master = substream;
1149         return 0;
1150 }
1151
1152 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1153 {
1154         struct snd_pcm_runtime *runtime = substream->runtime;
1155         if (runtime->trigger_master != substream)
1156                 return 0;
1157         /* DMA not running previously? */
1158         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1159             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1160              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1161                 return 0;
1162         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1163 }
1164
1165 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1166 {
1167         if (substream->runtime->trigger_master == substream &&
1168             snd_pcm_running(substream))
1169                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1170 }
1171
1172 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1173 {
1174         struct snd_pcm_runtime *runtime = substream->runtime;
1175         snd_pcm_trigger_tstamp(substream);
1176         if (substream->timer)
1177                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1178                                  &runtime->trigger_tstamp);
1179         runtime->status->state = runtime->status->suspended_state;
1180         if (runtime->sleep_min)
1181                 snd_pcm_tick_prepare(substream);
1182 }
1183
1184 static struct action_ops snd_pcm_action_resume = {
1185         .pre_action = snd_pcm_pre_resume,
1186         .do_action = snd_pcm_do_resume,
1187         .undo_action = snd_pcm_undo_resume,
1188         .post_action = snd_pcm_post_resume
1189 };
1190
1191 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1192 {
1193         struct snd_card *card = substream->pcm->card;
1194         int res;
1195
1196         snd_power_lock(card);
1197         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1198                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1199         snd_power_unlock(card);
1200         return res;
1201 }
1202
1203 #else
1204
1205 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1206 {
1207         return -ENOSYS;
1208 }
1209
1210 #endif /* CONFIG_PM */
1211
1212 /*
1213  * xrun ioctl
1214  *
1215  * Change the RUNNING stream(s) to XRUN state.
1216  */
1217 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1218 {
1219         struct snd_card *card = substream->pcm->card;
1220         struct snd_pcm_runtime *runtime = substream->runtime;
1221         int result;
1222
1223         snd_power_lock(card);
1224         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1225                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1226                 if (result < 0)
1227                         goto _unlock;
1228         }
1229
1230         snd_pcm_stream_lock_irq(substream);
1231         switch (runtime->status->state) {
1232         case SNDRV_PCM_STATE_XRUN:
1233                 result = 0;     /* already there */
1234                 break;
1235         case SNDRV_PCM_STATE_RUNNING:
1236                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1237                 break;
1238         default:
1239                 result = -EBADFD;
1240         }
1241         snd_pcm_stream_unlock_irq(substream);
1242  _unlock:
1243         snd_power_unlock(card);
1244         return result;
1245 }
1246
1247 /*
1248  * reset ioctl
1249  */
1250 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1251 {
1252         struct snd_pcm_runtime *runtime = substream->runtime;
1253         switch (runtime->status->state) {
1254         case SNDRV_PCM_STATE_RUNNING:
1255         case SNDRV_PCM_STATE_PREPARED:
1256         case SNDRV_PCM_STATE_PAUSED:
1257         case SNDRV_PCM_STATE_SUSPENDED:
1258                 return 0;
1259         default:
1260                 return -EBADFD;
1261         }
1262 }
1263
1264 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1265 {
1266         struct snd_pcm_runtime *runtime = substream->runtime;
1267         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1268         if (err < 0)
1269                 return err;
1270         // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1271         runtime->hw_ptr_base = 0;
1272         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1273                 runtime->status->hw_ptr % runtime->period_size;
1274         runtime->silence_start = runtime->status->hw_ptr;
1275         runtime->silence_filled = 0;
1276         return 0;
1277 }
1278
1279 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1280 {
1281         struct snd_pcm_runtime *runtime = substream->runtime;
1282         runtime->control->appl_ptr = runtime->status->hw_ptr;
1283         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1284             runtime->silence_size > 0)
1285                 snd_pcm_playback_silence(substream, ULONG_MAX);
1286 }
1287
1288 static struct action_ops snd_pcm_action_reset = {
1289         .pre_action = snd_pcm_pre_reset,
1290         .do_action = snd_pcm_do_reset,
1291         .post_action = snd_pcm_post_reset
1292 };
1293
1294 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1295 {
1296         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1297 }
1298
1299 /*
1300  * prepare ioctl
1301  */
1302 /* we use the second argument for updating f_flags */
1303 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1304                                int f_flags)
1305 {
1306         struct snd_pcm_runtime *runtime = substream->runtime;
1307         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1308             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1309                 return -EBADFD;
1310         if (snd_pcm_running(substream))
1311                 return -EBUSY;
1312         substream->f_flags = f_flags;
1313         return 0;
1314 }
1315
1316 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1317 {
1318         int err;
1319         err = substream->ops->prepare(substream);
1320         if (err < 0)
1321                 return err;
1322         return snd_pcm_do_reset(substream, 0);
1323 }
1324
1325 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1326 {
1327         struct snd_pcm_runtime *runtime = substream->runtime;
1328         runtime->control->appl_ptr = runtime->status->hw_ptr;
1329         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1330 }
1331
1332 static struct action_ops snd_pcm_action_prepare = {
1333         .pre_action = snd_pcm_pre_prepare,
1334         .do_action = snd_pcm_do_prepare,
1335         .post_action = snd_pcm_post_prepare
1336 };
1337
1338 /**
1339  * snd_pcm_prepare
1340  * @substream: the PCM substream instance
1341  * @file: file to refer f_flags
1342  *
1343  * Prepare the PCM substream to be triggerable.
1344  */
1345 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1346                            struct file *file)
1347 {
1348         int res;
1349         struct snd_card *card = substream->pcm->card;
1350         int f_flags;
1351
1352         if (file)
1353                 f_flags = file->f_flags;
1354         else
1355                 f_flags = substream->f_flags;
1356
1357         snd_power_lock(card);
1358         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1359                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1360                                                substream, f_flags);
1361         snd_power_unlock(card);
1362         return res;
1363 }
1364
1365 /*
1366  * drain ioctl
1367  */
1368
1369 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1370 {
1371         if (substream->f_flags & O_NONBLOCK)
1372                 return -EAGAIN;
1373         substream->runtime->trigger_master = substream;
1374         return 0;
1375 }
1376
1377 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1378 {
1379         struct snd_pcm_runtime *runtime = substream->runtime;
1380         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1381                 switch (runtime->status->state) {
1382                 case SNDRV_PCM_STATE_PREPARED:
1383                         /* start playback stream if possible */
1384                         if (! snd_pcm_playback_empty(substream)) {
1385                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1386                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1387                         }
1388                         break;
1389                 case SNDRV_PCM_STATE_RUNNING:
1390                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1391                         break;
1392                 default:
1393                         break;
1394                 }
1395         } else {
1396                 /* stop running stream */
1397                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1398                         int state = snd_pcm_capture_avail(runtime) > 0 ?
1399                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1400                         snd_pcm_do_stop(substream, state);
1401                         snd_pcm_post_stop(substream, state);
1402                 }
1403         }
1404         return 0;
1405 }
1406
1407 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1408 {
1409 }
1410
1411 static struct action_ops snd_pcm_action_drain_init = {
1412         .pre_action = snd_pcm_pre_drain_init,
1413         .do_action = snd_pcm_do_drain_init,
1414         .post_action = snd_pcm_post_drain_init
1415 };
1416
1417 struct drain_rec {
1418         struct snd_pcm_substream *substream;
1419         wait_queue_t wait;
1420         snd_pcm_uframes_t stop_threshold;
1421 };
1422
1423 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1424
1425 /*
1426  * Drain the stream(s).
1427  * When the substream is linked, sync until the draining of all playback streams
1428  * is finished.
1429  * After this call, all streams are supposed to be either SETUP or DRAINING
1430  * (capture only) state.
1431  */
1432 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1433 {
1434         struct snd_card *card;
1435         struct snd_pcm_runtime *runtime;
1436         struct snd_pcm_substream *s;
1437         int result = 0;
1438         int i, num_drecs;
1439         struct drain_rec *drec, drec_tmp, *d;
1440
1441         snd_assert(substream != NULL, return -ENXIO);
1442         card = substream->pcm->card;
1443         runtime = substream->runtime;
1444
1445         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1446                 return -EBADFD;
1447
1448         snd_power_lock(card);
1449         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1450                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1451                 if (result < 0) {
1452                         snd_power_unlock(card);
1453                         return result;
1454                 }
1455         }
1456
1457         /* allocate temporary record for drain sync */
1458         down_read(&snd_pcm_link_rwsem);
1459         if (snd_pcm_stream_linked(substream)) {
1460                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1461                 if (! drec) {
1462                         up_read(&snd_pcm_link_rwsem);
1463                         snd_power_unlock(card);
1464                         return -ENOMEM;
1465                 }
1466         } else
1467                 drec = &drec_tmp;
1468
1469         /* count only playback streams */
1470         num_drecs = 0;
1471         snd_pcm_group_for_each_entry(s, substream) {
1472                 runtime = s->runtime;
1473                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1474                         d = &drec[num_drecs++];
1475                         d->substream = s;
1476                         init_waitqueue_entry(&d->wait, current);
1477                         add_wait_queue(&runtime->sleep, &d->wait);
1478                         /* stop_threshold fixup to avoid endless loop when
1479                          * stop_threshold > buffer_size
1480                          */
1481                         d->stop_threshold = runtime->stop_threshold;
1482                         if (runtime->stop_threshold > runtime->buffer_size)
1483                                 runtime->stop_threshold = runtime->buffer_size;
1484                 }
1485         }
1486         up_read(&snd_pcm_link_rwsem);
1487
1488         snd_pcm_stream_lock_irq(substream);
1489         /* resume pause */
1490         if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1491                 snd_pcm_pause(substream, 0);
1492
1493         /* pre-start/stop - all running streams are changed to DRAINING state */
1494         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1495         if (result < 0) {
1496                 snd_pcm_stream_unlock_irq(substream);
1497                 goto _error;
1498         }
1499
1500         for (;;) {
1501                 long tout;
1502                 if (signal_pending(current)) {
1503                         result = -ERESTARTSYS;
1504                         break;
1505                 }
1506                 /* all finished? */
1507                 for (i = 0; i < num_drecs; i++) {
1508                         runtime = drec[i].substream->runtime;
1509                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1510                                 break;
1511                 }
1512                 if (i == num_drecs)
1513                         break; /* yes, all drained */
1514
1515                 set_current_state(TASK_INTERRUPTIBLE);
1516                 snd_pcm_stream_unlock_irq(substream);
1517                 snd_power_unlock(card);
1518                 tout = schedule_timeout(10 * HZ);
1519                 snd_power_lock(card);
1520                 snd_pcm_stream_lock_irq(substream);
1521                 if (tout == 0) {
1522                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1523                                 result = -ESTRPIPE;
1524                         else {
1525                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1526                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1527                                 result = -EIO;
1528                         }
1529                         break;
1530                 }
1531         }
1532
1533         snd_pcm_stream_unlock_irq(substream);
1534
1535  _error:
1536         for (i = 0; i < num_drecs; i++) {
1537                 d = &drec[i];
1538                 runtime = d->substream->runtime;
1539                 remove_wait_queue(&runtime->sleep, &d->wait);
1540                 runtime->stop_threshold = d->stop_threshold;
1541         }
1542
1543         if (drec != &drec_tmp)
1544                 kfree(drec);
1545         snd_power_unlock(card);
1546
1547         return result;
1548 }
1549
1550 /*
1551  * drop ioctl
1552  *
1553  * Immediately put all linked substreams into SETUP state.
1554  */
1555 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1556 {
1557         struct snd_pcm_runtime *runtime;
1558         struct snd_card *card;
1559         int result = 0;
1560
1561         snd_assert(substream != NULL, return -ENXIO);
1562         runtime = substream->runtime;
1563         card = substream->pcm->card;
1564
1565         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1566             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1567                 return -EBADFD;
1568
1569         snd_power_lock(card);
1570         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1571                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1572                 if (result < 0)
1573                         goto _unlock;
1574         }
1575
1576         snd_pcm_stream_lock_irq(substream);
1577         /* resume pause */
1578         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1579                 snd_pcm_pause(substream, 0);
1580
1581         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1582         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1583         snd_pcm_stream_unlock_irq(substream);
1584  _unlock:
1585         snd_power_unlock(card);
1586         return result;
1587 }
1588
1589
1590 /* WARNING: Don't forget to fput back the file */
1591 static struct file *snd_pcm_file_fd(int fd)
1592 {
1593         struct file *file;
1594         struct inode *inode;
1595         unsigned int minor;
1596
1597         file = fget(fd);
1598         if (!file)
1599                 return NULL;
1600         inode = file->f_path.dentry->d_inode;
1601         if (!S_ISCHR(inode->i_mode) ||
1602             imajor(inode) != snd_major) {
1603                 fput(file);
1604                 return NULL;
1605         }
1606         minor = iminor(inode);
1607         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1608             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1609                 fput(file);
1610                 return NULL;
1611         }
1612         return file;
1613 }
1614
1615 /*
1616  * PCM link handling
1617  */
1618 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1619 {
1620         int res = 0;
1621         struct file *file;
1622         struct snd_pcm_file *pcm_file;
1623         struct snd_pcm_substream *substream1;
1624
1625         file = snd_pcm_file_fd(fd);
1626         if (!file)
1627                 return -EBADFD;
1628         pcm_file = file->private_data;
1629         substream1 = pcm_file->substream;
1630         down_write(&snd_pcm_link_rwsem);
1631         write_lock_irq(&snd_pcm_link_rwlock);
1632         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1633             substream->runtime->status->state != substream1->runtime->status->state) {
1634                 res = -EBADFD;
1635                 goto _end;
1636         }
1637         if (snd_pcm_stream_linked(substream1)) {
1638                 res = -EALREADY;
1639                 goto _end;
1640         }
1641         if (!snd_pcm_stream_linked(substream)) {
1642                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1643                 if (substream->group == NULL) {
1644                         res = -ENOMEM;
1645                         goto _end;
1646                 }
1647                 spin_lock_init(&substream->group->lock);
1648                 INIT_LIST_HEAD(&substream->group->substreams);
1649                 list_add_tail(&substream->link_list, &substream->group->substreams);
1650                 substream->group->count = 1;
1651         }
1652         list_add_tail(&substream1->link_list, &substream->group->substreams);
1653         substream->group->count++;
1654         substream1->group = substream->group;
1655  _end:
1656         write_unlock_irq(&snd_pcm_link_rwlock);
1657         up_write(&snd_pcm_link_rwsem);
1658         fput(file);
1659         return res;
1660 }
1661
1662 static void relink_to_local(struct snd_pcm_substream *substream)
1663 {
1664         substream->group = &substream->self_group;
1665         INIT_LIST_HEAD(&substream->self_group.substreams);
1666         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1667 }
1668
1669 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1670 {
1671         struct snd_pcm_substream *s;
1672         int res = 0;
1673
1674         down_write(&snd_pcm_link_rwsem);
1675         write_lock_irq(&snd_pcm_link_rwlock);
1676         if (!snd_pcm_stream_linked(substream)) {
1677                 res = -EALREADY;
1678                 goto _end;
1679         }
1680         list_del(&substream->link_list);
1681         substream->group->count--;
1682         if (substream->group->count == 1) {     /* detach the last stream, too */
1683                 snd_pcm_group_for_each_entry(s, substream) {
1684                         relink_to_local(s);
1685                         break;
1686                 }
1687                 kfree(substream->group);
1688         }
1689         relink_to_local(substream);
1690        _end:
1691         write_unlock_irq(&snd_pcm_link_rwlock);
1692         up_write(&snd_pcm_link_rwsem);
1693         return res;
1694 }
1695
1696 /*
1697  * hw configurator
1698  */
1699 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1700                                struct snd_pcm_hw_rule *rule)
1701 {
1702         struct snd_interval t;
1703         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1704                      hw_param_interval_c(params, rule->deps[1]), &t);
1705         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1706 }
1707
1708 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1709                                struct snd_pcm_hw_rule *rule)
1710 {
1711         struct snd_interval t;
1712         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1713                      hw_param_interval_c(params, rule->deps[1]), &t);
1714         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1715 }
1716
1717 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1718                                    struct snd_pcm_hw_rule *rule)
1719 {
1720         struct snd_interval t;
1721         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1722                          hw_param_interval_c(params, rule->deps[1]),
1723                          (unsigned long) rule->private, &t);
1724         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1725 }
1726
1727 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1728                                    struct snd_pcm_hw_rule *rule)
1729 {
1730         struct snd_interval t;
1731         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1732                          (unsigned long) rule->private,
1733                          hw_param_interval_c(params, rule->deps[1]), &t);
1734         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1735 }
1736
1737 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1738                                   struct snd_pcm_hw_rule *rule)
1739 {
1740         unsigned int k;
1741         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1742         struct snd_mask m;
1743         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1744         snd_mask_any(&m);
1745         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1746                 int bits;
1747                 if (! snd_mask_test(mask, k))
1748                         continue;
1749                 bits = snd_pcm_format_physical_width(k);
1750                 if (bits <= 0)
1751                         continue; /* ignore invalid formats */
1752                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1753                         snd_mask_reset(&m, k);
1754         }
1755         return snd_mask_refine(mask, &m);
1756 }
1757
1758 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1759                                        struct snd_pcm_hw_rule *rule)
1760 {
1761         struct snd_interval t;
1762         unsigned int k;
1763         t.min = UINT_MAX;
1764         t.max = 0;
1765         t.openmin = 0;
1766         t.openmax = 0;
1767         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1768                 int bits;
1769                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1770                         continue;
1771                 bits = snd_pcm_format_physical_width(k);
1772                 if (bits <= 0)
1773                         continue; /* ignore invalid formats */
1774                 if (t.min > (unsigned)bits)
1775                         t.min = bits;
1776                 if (t.max < (unsigned)bits)
1777                         t.max = bits;
1778         }
1779         t.integer = 1;
1780         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1781 }
1782
1783 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1784 #error "Change this table"
1785 #endif
1786
1787 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1788                                  48000, 64000, 88200, 96000, 176400, 192000 };
1789
1790 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1791         .count = ARRAY_SIZE(rates),
1792         .list = rates,
1793 };
1794
1795 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1796                                 struct snd_pcm_hw_rule *rule)
1797 {
1798         struct snd_pcm_hardware *hw = rule->private;
1799         return snd_interval_list(hw_param_interval(params, rule->var),
1800                                  snd_pcm_known_rates.count,
1801                                  snd_pcm_known_rates.list, hw->rates);
1802 }
1803
1804 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1805                                             struct snd_pcm_hw_rule *rule)
1806 {
1807         struct snd_interval t;
1808         struct snd_pcm_substream *substream = rule->private;
1809         t.min = 0;
1810         t.max = substream->buffer_bytes_max;
1811         t.openmin = 0;
1812         t.openmax = 0;
1813         t.integer = 1;
1814         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1815 }
1816
1817 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1818 {
1819         struct snd_pcm_runtime *runtime = substream->runtime;
1820         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1821         int k, err;
1822
1823         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1824                 snd_mask_any(constrs_mask(constrs, k));
1825         }
1826
1827         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1828                 snd_interval_any(constrs_interval(constrs, k));
1829         }
1830
1831         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1832         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1833         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1834         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1835         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1836
1837         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1838                                    snd_pcm_hw_rule_format, NULL,
1839                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1840         if (err < 0)
1841                 return err;
1842         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1843                                   snd_pcm_hw_rule_sample_bits, NULL,
1844                                   SNDRV_PCM_HW_PARAM_FORMAT,
1845                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1846         if (err < 0)
1847                 return err;
1848         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1849                                   snd_pcm_hw_rule_div, NULL,
1850                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1854                                   snd_pcm_hw_rule_mul, NULL,
1855                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1856         if (err < 0)
1857                 return err;
1858         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1860                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1861         if (err < 0)
1862                 return err;
1863         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1864                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1866         if (err < 0)
1867                 return err;
1868         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1869                                   snd_pcm_hw_rule_div, NULL,
1870                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1871         if (err < 0)
1872                 return err;
1873         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1874                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1875                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1876         if (err < 0)
1877                 return err;
1878         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1879                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1880                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1881         if (err < 0)
1882                 return err;
1883         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1884                                   snd_pcm_hw_rule_div, NULL,
1885                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1886         if (err < 0)
1887                 return err;
1888         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1889                                   snd_pcm_hw_rule_div, NULL,
1890                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1891         if (err < 0)
1892                 return err;
1893         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1895                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896         if (err < 0)
1897                 return err;
1898         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1899                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1900                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1901         if (err < 0)
1902                 return err;
1903         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1904                                   snd_pcm_hw_rule_mul, NULL,
1905                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1906         if (err < 0)
1907                 return err;
1908         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1910                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1911         if (err < 0)
1912                 return err;
1913         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1914                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1915                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1916         if (err < 0)
1917                 return err;
1918         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1919                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1920                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1921         if (err < 0)
1922                 return err;
1923         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1924                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1925                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1926         if (err < 0)
1927                 return err;
1928         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1929                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1930                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1931         if (err < 0)
1932                 return err;
1933         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1934                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1935                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1936         if (err < 0)
1937                 return err;
1938         return 0;
1939 }
1940
1941 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1942 {
1943         struct snd_pcm_runtime *runtime = substream->runtime;
1944         struct snd_pcm_hardware *hw = &runtime->hw;
1945         int err;
1946         unsigned int mask = 0;
1947
1948         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1949                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1950         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1951                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1952         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1953                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1954                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1955                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1956                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1957                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1958                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1959         }
1960         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1961         snd_assert(err >= 0, return -EINVAL);
1962
1963         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1964         snd_assert(err >= 0, return -EINVAL);
1965
1966         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1967         snd_assert(err >= 0, return -EINVAL);
1968
1969         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1970                                            hw->channels_min, hw->channels_max);
1971         snd_assert(err >= 0, return -EINVAL);
1972
1973         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1974                                            hw->rate_min, hw->rate_max);
1975         snd_assert(err >= 0, return -EINVAL);
1976
1977         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1978                                            hw->period_bytes_min, hw->period_bytes_max);
1979         snd_assert(err >= 0, return -EINVAL);
1980
1981         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1982                                            hw->periods_min, hw->periods_max);
1983         snd_assert(err >= 0, return -EINVAL);
1984
1985         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1986                                            hw->period_bytes_min, hw->buffer_bytes_max);
1987         snd_assert(err >= 0, return -EINVAL);
1988
1989         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1990                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1991                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1992         if (err < 0)
1993                 return err;
1994
1995         /* FIXME: remove */
1996         if (runtime->dma_bytes) {
1997                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1998                 snd_assert(err >= 0, return -EINVAL);
1999         }
2000
2001         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2002                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2003                                           snd_pcm_hw_rule_rate, hw,
2004                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2005                 if (err < 0)
2006                         return err;
2007         }
2008
2009         /* FIXME: this belong to lowlevel */
2010         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_TICK_TIME,
2011                                      1000000 / HZ, 1000000 / HZ);
2012         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2013
2014         return 0;
2015 }
2016
2017 static void pcm_release_private(struct snd_pcm_substream *substream)
2018 {
2019         snd_pcm_unlink(substream);
2020 }
2021
2022 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2023 {
2024         substream->ref_count--;
2025         if (substream->ref_count > 0)
2026                 return;
2027
2028         snd_pcm_drop(substream);
2029         if (substream->hw_opened) {
2030                 if (substream->ops->hw_free != NULL)
2031                         substream->ops->hw_free(substream);
2032                 substream->ops->close(substream);
2033                 substream->hw_opened = 0;
2034         }
2035         if (substream->pcm_release) {
2036                 substream->pcm_release(substream);
2037                 substream->pcm_release = NULL;
2038         }
2039         snd_pcm_detach_substream(substream);
2040 }
2041
2042 EXPORT_SYMBOL(snd_pcm_release_substream);
2043
2044 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2045                            struct file *file,
2046                            struct snd_pcm_substream **rsubstream)
2047 {
2048         struct snd_pcm_substream *substream;
2049         int err;
2050
2051         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2052         if (err < 0)
2053                 return err;
2054         if (substream->ref_count > 1) {
2055                 *rsubstream = substream;
2056                 return 0;
2057         }
2058
2059         err = snd_pcm_hw_constraints_init(substream);
2060         if (err < 0) {
2061                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2062                 goto error;
2063         }
2064
2065         if ((err = substream->ops->open(substream)) < 0)
2066                 goto error;
2067
2068         substream->hw_opened = 1;
2069
2070         err = snd_pcm_hw_constraints_complete(substream);
2071         if (err < 0) {
2072                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2073                 goto error;
2074         }
2075
2076         *rsubstream = substream;
2077         return 0;
2078
2079  error:
2080         snd_pcm_release_substream(substream);
2081         return err;
2082 }
2083
2084 EXPORT_SYMBOL(snd_pcm_open_substream);
2085
2086 static int snd_pcm_open_file(struct file *file,
2087                              struct snd_pcm *pcm,
2088                              int stream,
2089                              struct snd_pcm_file **rpcm_file)
2090 {
2091         struct snd_pcm_file *pcm_file;
2092         struct snd_pcm_substream *substream;
2093         struct snd_pcm_str *str;
2094         int err;
2095
2096         snd_assert(rpcm_file != NULL, return -EINVAL);
2097         *rpcm_file = NULL;
2098
2099         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2100         if (err < 0)
2101                 return err;
2102
2103         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2104         if (pcm_file == NULL) {
2105                 snd_pcm_release_substream(substream);
2106                 return -ENOMEM;
2107         }
2108         pcm_file->substream = substream;
2109         if (substream->ref_count == 1) {
2110                 str = substream->pstr;
2111                 substream->file = pcm_file;
2112                 substream->pcm_release = pcm_release_private;
2113         }
2114         file->private_data = pcm_file;
2115         *rpcm_file = pcm_file;
2116         return 0;
2117 }
2118
2119 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2120 {
2121         struct snd_pcm *pcm;
2122
2123         pcm = snd_lookup_minor_data(iminor(inode),
2124                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2125         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2126 }
2127
2128 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2129 {
2130         struct snd_pcm *pcm;
2131
2132         pcm = snd_lookup_minor_data(iminor(inode),
2133                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2134         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2135 }
2136
2137 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2138 {
2139         int err;
2140         struct snd_pcm_file *pcm_file;
2141         wait_queue_t wait;
2142
2143         if (pcm == NULL) {
2144                 err = -ENODEV;
2145                 goto __error1;
2146         }
2147         err = snd_card_file_add(pcm->card, file);
2148         if (err < 0)
2149                 goto __error1;
2150         if (!try_module_get(pcm->card->module)) {
2151                 err = -EFAULT;
2152                 goto __error2;
2153         }
2154         init_waitqueue_entry(&wait, current);
2155         add_wait_queue(&pcm->open_wait, &wait);
2156         mutex_lock(&pcm->open_mutex);
2157         while (1) {
2158                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2159                 if (err >= 0)
2160                         break;
2161                 if (err == -EAGAIN) {
2162                         if (file->f_flags & O_NONBLOCK) {
2163                                 err = -EBUSY;
2164                                 break;
2165                         }
2166                 } else
2167                         break;
2168                 set_current_state(TASK_INTERRUPTIBLE);
2169                 mutex_unlock(&pcm->open_mutex);
2170                 schedule();
2171                 mutex_lock(&pcm->open_mutex);
2172                 if (signal_pending(current)) {
2173                         err = -ERESTARTSYS;
2174                         break;
2175                 }
2176         }
2177         remove_wait_queue(&pcm->open_wait, &wait);
2178         mutex_unlock(&pcm->open_mutex);
2179         if (err < 0)
2180                 goto __error;
2181         return err;
2182
2183       __error:
2184         module_put(pcm->card->module);
2185       __error2:
2186         snd_card_file_remove(pcm->card, file);
2187       __error1:
2188         return err;
2189 }
2190
2191 static int snd_pcm_release(struct inode *inode, struct file *file)
2192 {
2193         struct snd_pcm *pcm;
2194         struct snd_pcm_substream *substream;
2195         struct snd_pcm_file *pcm_file;
2196
2197         pcm_file = file->private_data;
2198         substream = pcm_file->substream;
2199         snd_assert(substream != NULL, return -ENXIO);
2200         pcm = substream->pcm;
2201         fasync_helper(-1, file, 0, &substream->runtime->fasync);
2202         mutex_lock(&pcm->open_mutex);
2203         snd_pcm_release_substream(substream);
2204         kfree(pcm_file);
2205         mutex_unlock(&pcm->open_mutex);
2206         wake_up(&pcm->open_wait);
2207         module_put(pcm->card->module);
2208         snd_card_file_remove(pcm->card, file);
2209         return 0;
2210 }
2211
2212 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2213                                                  snd_pcm_uframes_t frames)
2214 {
2215         struct snd_pcm_runtime *runtime = substream->runtime;
2216         snd_pcm_sframes_t appl_ptr;
2217         snd_pcm_sframes_t ret;
2218         snd_pcm_sframes_t hw_avail;
2219
2220         if (frames == 0)
2221                 return 0;
2222
2223         snd_pcm_stream_lock_irq(substream);
2224         switch (runtime->status->state) {
2225         case SNDRV_PCM_STATE_PREPARED:
2226                 break;
2227         case SNDRV_PCM_STATE_DRAINING:
2228         case SNDRV_PCM_STATE_RUNNING:
2229                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2230                         break;
2231                 /* Fall through */
2232         case SNDRV_PCM_STATE_XRUN:
2233                 ret = -EPIPE;
2234                 goto __end;
2235         default:
2236                 ret = -EBADFD;
2237                 goto __end;
2238         }
2239
2240         hw_avail = snd_pcm_playback_hw_avail(runtime);
2241         if (hw_avail <= 0) {
2242                 ret = 0;
2243                 goto __end;
2244         }
2245         if (frames > (snd_pcm_uframes_t)hw_avail)
2246                 frames = hw_avail;
2247         else
2248                 frames -= frames % runtime->xfer_align;
2249         appl_ptr = runtime->control->appl_ptr - frames;
2250         if (appl_ptr < 0)
2251                 appl_ptr += runtime->boundary;
2252         runtime->control->appl_ptr = appl_ptr;
2253         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2254             runtime->sleep_min)
2255                 snd_pcm_tick_prepare(substream);
2256         ret = frames;
2257  __end:
2258         snd_pcm_stream_unlock_irq(substream);
2259         return ret;
2260 }
2261
2262 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2263                                                 snd_pcm_uframes_t frames)
2264 {
2265         struct snd_pcm_runtime *runtime = substream->runtime;
2266         snd_pcm_sframes_t appl_ptr;
2267         snd_pcm_sframes_t ret;
2268         snd_pcm_sframes_t hw_avail;
2269
2270         if (frames == 0)
2271                 return 0;
2272
2273         snd_pcm_stream_lock_irq(substream);
2274         switch (runtime->status->state) {
2275         case SNDRV_PCM_STATE_PREPARED:
2276         case SNDRV_PCM_STATE_DRAINING:
2277                 break;
2278         case SNDRV_PCM_STATE_RUNNING:
2279                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2280                         break;
2281                 /* Fall through */
2282         case SNDRV_PCM_STATE_XRUN:
2283                 ret = -EPIPE;
2284                 goto __end;
2285         default:
2286                 ret = -EBADFD;
2287                 goto __end;
2288         }
2289
2290         hw_avail = snd_pcm_capture_hw_avail(runtime);
2291         if (hw_avail <= 0) {
2292                 ret = 0;
2293                 goto __end;
2294         }
2295         if (frames > (snd_pcm_uframes_t)hw_avail)
2296                 frames = hw_avail;
2297         else
2298                 frames -= frames % runtime->xfer_align;
2299         appl_ptr = runtime->control->appl_ptr - frames;
2300         if (appl_ptr < 0)
2301                 appl_ptr += runtime->boundary;
2302         runtime->control->appl_ptr = appl_ptr;
2303         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2304             runtime->sleep_min)
2305                 snd_pcm_tick_prepare(substream);
2306         ret = frames;
2307  __end:
2308         snd_pcm_stream_unlock_irq(substream);
2309         return ret;
2310 }
2311
2312 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2313                                                   snd_pcm_uframes_t frames)
2314 {
2315         struct snd_pcm_runtime *runtime = substream->runtime;
2316         snd_pcm_sframes_t appl_ptr;
2317         snd_pcm_sframes_t ret;
2318         snd_pcm_sframes_t avail;
2319
2320         if (frames == 0)
2321                 return 0;
2322
2323         snd_pcm_stream_lock_irq(substream);
2324         switch (runtime->status->state) {
2325         case SNDRV_PCM_STATE_PREPARED:
2326         case SNDRV_PCM_STATE_PAUSED:
2327                 break;
2328         case SNDRV_PCM_STATE_DRAINING:
2329         case SNDRV_PCM_STATE_RUNNING:
2330                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2331                         break;
2332                 /* Fall through */
2333         case SNDRV_PCM_STATE_XRUN:
2334                 ret = -EPIPE;
2335                 goto __end;
2336         default:
2337                 ret = -EBADFD;
2338                 goto __end;
2339         }
2340
2341         avail = snd_pcm_playback_avail(runtime);
2342         if (avail <= 0) {
2343                 ret = 0;
2344                 goto __end;
2345         }
2346         if (frames > (snd_pcm_uframes_t)avail)
2347                 frames = avail;
2348         else
2349                 frames -= frames % runtime->xfer_align;
2350         appl_ptr = runtime->control->appl_ptr + frames;
2351         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2352                 appl_ptr -= runtime->boundary;
2353         runtime->control->appl_ptr = appl_ptr;
2354         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2355             runtime->sleep_min)
2356                 snd_pcm_tick_prepare(substream);
2357         ret = frames;
2358  __end:
2359         snd_pcm_stream_unlock_irq(substream);
2360         return ret;
2361 }
2362
2363 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2364                                                  snd_pcm_uframes_t frames)
2365 {
2366         struct snd_pcm_runtime *runtime = substream->runtime;
2367         snd_pcm_sframes_t appl_ptr;
2368         snd_pcm_sframes_t ret;
2369         snd_pcm_sframes_t avail;
2370
2371         if (frames == 0)
2372                 return 0;
2373
2374         snd_pcm_stream_lock_irq(substream);
2375         switch (runtime->status->state) {
2376         case SNDRV_PCM_STATE_PREPARED:
2377         case SNDRV_PCM_STATE_DRAINING:
2378         case SNDRV_PCM_STATE_PAUSED:
2379                 break;
2380         case SNDRV_PCM_STATE_RUNNING:
2381                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2382                         break;
2383                 /* Fall through */
2384         case SNDRV_PCM_STATE_XRUN:
2385                 ret = -EPIPE;
2386                 goto __end;
2387         default:
2388                 ret = -EBADFD;
2389                 goto __end;
2390         }
2391
2392         avail = snd_pcm_capture_avail(runtime);
2393         if (avail <= 0) {
2394                 ret = 0;
2395                 goto __end;
2396         }
2397         if (frames > (snd_pcm_uframes_t)avail)
2398                 frames = avail;
2399         else
2400                 frames -= frames % runtime->xfer_align;
2401         appl_ptr = runtime->control->appl_ptr + frames;
2402         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2403                 appl_ptr -= runtime->boundary;
2404         runtime->control->appl_ptr = appl_ptr;
2405         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2406             runtime->sleep_min)
2407                 snd_pcm_tick_prepare(substream);
2408         ret = frames;
2409  __end:
2410         snd_pcm_stream_unlock_irq(substream);
2411         return ret;
2412 }
2413
2414 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2415 {
2416         struct snd_pcm_runtime *runtime = substream->runtime;
2417         int err;
2418
2419         snd_pcm_stream_lock_irq(substream);
2420         switch (runtime->status->state) {
2421         case SNDRV_PCM_STATE_DRAINING:
2422                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2423                         goto __badfd;
2424         case SNDRV_PCM_STATE_RUNNING:
2425                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2426                         break;
2427                 /* Fall through */
2428         case SNDRV_PCM_STATE_PREPARED:
2429         case SNDRV_PCM_STATE_SUSPENDED:
2430                 err = 0;
2431                 break;
2432         case SNDRV_PCM_STATE_XRUN:
2433                 err = -EPIPE;
2434                 break;
2435         default:
2436               __badfd:
2437                 err = -EBADFD;
2438                 break;
2439         }
2440         snd_pcm_stream_unlock_irq(substream);
2441         return err;
2442 }
2443
2444 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2445                          snd_pcm_sframes_t __user *res)
2446 {
2447         struct snd_pcm_runtime *runtime = substream->runtime;
2448         int err;
2449         snd_pcm_sframes_t n = 0;
2450
2451         snd_pcm_stream_lock_irq(substream);
2452         switch (runtime->status->state) {
2453         case SNDRV_PCM_STATE_DRAINING:
2454                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2455                         goto __badfd;
2456         case SNDRV_PCM_STATE_RUNNING:
2457                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2458                         break;
2459                 /* Fall through */
2460         case SNDRV_PCM_STATE_PREPARED:
2461         case SNDRV_PCM_STATE_SUSPENDED:
2462                 err = 0;
2463                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2464                         n = snd_pcm_playback_hw_avail(runtime);
2465                 else
2466                         n = snd_pcm_capture_avail(runtime);
2467                 break;
2468         case SNDRV_PCM_STATE_XRUN:
2469                 err = -EPIPE;
2470                 break;
2471         default:
2472               __badfd:
2473                 err = -EBADFD;
2474                 break;
2475         }
2476         snd_pcm_stream_unlock_irq(substream);
2477         if (!err)
2478                 if (put_user(n, res))
2479                         err = -EFAULT;
2480         return err;
2481 }
2482
2483 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2484                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2485 {
2486         struct snd_pcm_runtime *runtime = substream->runtime;
2487         struct snd_pcm_sync_ptr sync_ptr;
2488         volatile struct snd_pcm_mmap_status *status;
2489         volatile struct snd_pcm_mmap_control *control;
2490         int err;
2491
2492         memset(&sync_ptr, 0, sizeof(sync_ptr));
2493         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2494                 return -EFAULT;
2495         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2496                 return -EFAULT;
2497         status = runtime->status;
2498         control = runtime->control;
2499         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2500                 err = snd_pcm_hwsync(substream);
2501                 if (err < 0)
2502                         return err;
2503         }
2504         snd_pcm_stream_lock_irq(substream);
2505         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2506                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2507         else
2508                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2509         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2510                 control->avail_min = sync_ptr.c.control.avail_min;
2511         else
2512                 sync_ptr.c.control.avail_min = control->avail_min;
2513         sync_ptr.s.status.state = status->state;
2514         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2515         sync_ptr.s.status.tstamp = status->tstamp;
2516         sync_ptr.s.status.suspended_state = status->suspended_state;
2517         snd_pcm_stream_unlock_irq(substream);
2518         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2519                 return -EFAULT;
2520         return 0;
2521 }
2522
2523 static int snd_pcm_common_ioctl1(struct file *file,
2524                                  struct snd_pcm_substream *substream,
2525                                  unsigned int cmd, void __user *arg)
2526 {
2527         snd_assert(substream != NULL, return -ENXIO);
2528
2529         switch (cmd) {
2530         case SNDRV_PCM_IOCTL_PVERSION:
2531                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2532         case SNDRV_PCM_IOCTL_INFO:
2533                 return snd_pcm_info_user(substream, arg);
2534         case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2535                 return 0;
2536         case SNDRV_PCM_IOCTL_HW_REFINE:
2537                 return snd_pcm_hw_refine_user(substream, arg);
2538         case SNDRV_PCM_IOCTL_HW_PARAMS:
2539                 return snd_pcm_hw_params_user(substream, arg);
2540         case SNDRV_PCM_IOCTL_HW_FREE:
2541                 return snd_pcm_hw_free(substream);
2542         case SNDRV_PCM_IOCTL_SW_PARAMS:
2543                 return snd_pcm_sw_params_user(substream, arg);
2544         case SNDRV_PCM_IOCTL_STATUS:
2545                 return snd_pcm_status_user(substream, arg);
2546         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2547                 return snd_pcm_channel_info_user(substream, arg);
2548         case SNDRV_PCM_IOCTL_PREPARE:
2549                 return snd_pcm_prepare(substream, file);
2550         case SNDRV_PCM_IOCTL_RESET:
2551                 return snd_pcm_reset(substream);
2552         case SNDRV_PCM_IOCTL_START:
2553                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2554         case SNDRV_PCM_IOCTL_LINK:
2555                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2556         case SNDRV_PCM_IOCTL_UNLINK:
2557                 return snd_pcm_unlink(substream);
2558         case SNDRV_PCM_IOCTL_RESUME:
2559                 return snd_pcm_resume(substream);
2560         case SNDRV_PCM_IOCTL_XRUN:
2561                 return snd_pcm_xrun(substream);
2562         case SNDRV_PCM_IOCTL_HWSYNC:
2563                 return snd_pcm_hwsync(substream);
2564         case SNDRV_PCM_IOCTL_DELAY:
2565                 return snd_pcm_delay(substream, arg);
2566         case SNDRV_PCM_IOCTL_SYNC_PTR:
2567                 return snd_pcm_sync_ptr(substream, arg);
2568 #ifdef CONFIG_SND_SUPPORT_OLD_API
2569         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2570                 return snd_pcm_hw_refine_old_user(substream, arg);
2571         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2572                 return snd_pcm_hw_params_old_user(substream, arg);
2573 #endif
2574         case SNDRV_PCM_IOCTL_DRAIN:
2575                 return snd_pcm_drain(substream);
2576         case SNDRV_PCM_IOCTL_DROP:
2577                 return snd_pcm_drop(substream);
2578         case SNDRV_PCM_IOCTL_PAUSE:
2579         {
2580                 int res;
2581                 snd_pcm_stream_lock_irq(substream);
2582                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2583                 snd_pcm_stream_unlock_irq(substream);
2584                 return res;
2585         }
2586         }
2587         snd_printd("unknown ioctl = 0x%x\n", cmd);
2588         return -ENOTTY;
2589 }
2590
2591 static int snd_pcm_playback_ioctl1(struct file *file,
2592                                    struct snd_pcm_substream *substream,
2593                                    unsigned int cmd, void __user *arg)
2594 {
2595         snd_assert(substream != NULL, return -ENXIO);
2596         snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL);
2597         switch (cmd) {
2598         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2599         {
2600                 struct snd_xferi xferi;
2601                 struct snd_xferi __user *_xferi = arg;
2602                 struct snd_pcm_runtime *runtime = substream->runtime;
2603                 snd_pcm_sframes_t result;
2604                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2605                         return -EBADFD;
2606                 if (put_user(0, &_xferi->result))
2607                         return -EFAULT;
2608                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2609                         return -EFAULT;
2610                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2611                 __put_user(result, &_xferi->result);
2612                 return result < 0 ? result : 0;
2613         }
2614         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2615         {
2616                 struct snd_xfern xfern;
2617                 struct snd_xfern __user *_xfern = arg;
2618                 struct snd_pcm_runtime *runtime = substream->runtime;
2619                 void __user **bufs;
2620                 snd_pcm_sframes_t result;
2621                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2622                         return -EBADFD;
2623                 if (runtime->channels > 128)
2624                         return -EINVAL;
2625                 if (put_user(0, &_xfern->result))
2626                         return -EFAULT;
2627                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2628                         return -EFAULT;
2629                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2630                 if (bufs == NULL)
2631                         return -ENOMEM;
2632                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2633                         kfree(bufs);
2634                         return -EFAULT;
2635                 }
2636                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2637                 kfree(bufs);
2638                 __put_user(result, &_xfern->result);
2639                 return result < 0 ? result : 0;
2640         }
2641         case SNDRV_PCM_IOCTL_REWIND:
2642         {
2643                 snd_pcm_uframes_t frames;
2644                 snd_pcm_uframes_t __user *_frames = arg;
2645                 snd_pcm_sframes_t result;
2646                 if (get_user(frames, _frames))
2647                         return -EFAULT;
2648                 if (put_user(0, _frames))
2649                         return -EFAULT;
2650                 result = snd_pcm_playback_rewind(substream, frames);
2651                 __put_user(result, _frames);
2652                 return result < 0 ? result : 0;
2653         }
2654         case SNDRV_PCM_IOCTL_FORWARD:
2655         {
2656                 snd_pcm_uframes_t frames;
2657                 snd_pcm_uframes_t __user *_frames = arg;
2658                 snd_pcm_sframes_t result;
2659                 if (get_user(frames, _frames))
2660                         return -EFAULT;
2661                 if (put_user(0, _frames))
2662                         return -EFAULT;
2663                 result = snd_pcm_playback_forward(substream, frames);
2664                 __put_user(result, _frames);
2665                 return result < 0 ? result : 0;
2666         }
2667         }
2668         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2669 }
2670
2671 static int snd_pcm_capture_ioctl1(struct file *file,
2672                                   struct snd_pcm_substream *substream,
2673                                   unsigned int cmd, void __user *arg)
2674 {
2675         snd_assert(substream != NULL, return -ENXIO);
2676         snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL);
2677         switch (cmd) {
2678         case SNDRV_PCM_IOCTL_READI_FRAMES:
2679         {
2680                 struct snd_xferi xferi;
2681                 struct snd_xferi __user *_xferi = arg;
2682                 struct snd_pcm_runtime *runtime = substream->runtime;
2683                 snd_pcm_sframes_t result;
2684                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2685                         return -EBADFD;
2686                 if (put_user(0, &_xferi->result))
2687                         return -EFAULT;
2688                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2689                         return -EFAULT;
2690                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2691                 __put_user(result, &_xferi->result);
2692                 return result < 0 ? result : 0;
2693         }
2694         case SNDRV_PCM_IOCTL_READN_FRAMES:
2695         {
2696                 struct snd_xfern xfern;
2697                 struct snd_xfern __user *_xfern = arg;
2698                 struct snd_pcm_runtime *runtime = substream->runtime;
2699                 void *bufs;
2700                 snd_pcm_sframes_t result;
2701                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2702                         return -EBADFD;
2703                 if (runtime->channels > 128)
2704                         return -EINVAL;
2705                 if (put_user(0, &_xfern->result))
2706                         return -EFAULT;
2707                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2708                         return -EFAULT;
2709                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2710                 if (bufs == NULL)
2711                         return -ENOMEM;
2712                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2713                         kfree(bufs);
2714                         return -EFAULT;
2715                 }
2716                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2717                 kfree(bufs);
2718                 __put_user(result, &_xfern->result);
2719                 return result < 0 ? result : 0;
2720         }
2721         case SNDRV_PCM_IOCTL_REWIND:
2722         {
2723                 snd_pcm_uframes_t frames;
2724                 snd_pcm_uframes_t __user *_frames = arg;
2725                 snd_pcm_sframes_t result;
2726                 if (get_user(frames, _frames))
2727                         return -EFAULT;
2728                 if (put_user(0, _frames))
2729                         return -EFAULT;
2730                 result = snd_pcm_capture_rewind(substream, frames);
2731                 __put_user(result, _frames);
2732                 return result < 0 ? result : 0;
2733         }
2734         case SNDRV_PCM_IOCTL_FORWARD:
2735         {
2736                 snd_pcm_uframes_t frames;
2737                 snd_pcm_uframes_t __user *_frames = arg;
2738                 snd_pcm_sframes_t result;
2739                 if (get_user(frames, _frames))
2740                         return -EFAULT;
2741                 if (put_user(0, _frames))
2742                         return -EFAULT;
2743                 result = snd_pcm_capture_forward(substream, frames);
2744                 __put_user(result, _frames);
2745                 return result < 0 ? result : 0;
2746         }
2747         }
2748         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2749 }
2750
2751 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2752                                    unsigned long arg)
2753 {
2754         struct snd_pcm_file *pcm_file;
2755
2756         pcm_file = file->private_data;
2757
2758         if (((cmd >> 8) & 0xff) != 'A')
2759                 return -ENOTTY;
2760
2761         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2762                                        (void __user *)arg);
2763 }
2764
2765 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2766                                   unsigned long arg)
2767 {
2768         struct snd_pcm_file *pcm_file;
2769
2770         pcm_file = file->private_data;
2771
2772         if (((cmd >> 8) & 0xff) != 'A')
2773                 return -ENOTTY;
2774
2775         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2776                                       (void __user *)arg);
2777 }
2778
2779 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2780                          unsigned int cmd, void *arg)
2781 {
2782         mm_segment_t fs;
2783         int result;
2784
2785         fs = snd_enter_user();
2786         switch (substream->stream) {
2787         case SNDRV_PCM_STREAM_PLAYBACK:
2788                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2789                                                  (void __user *)arg);
2790                 break;
2791         case SNDRV_PCM_STREAM_CAPTURE:
2792                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2793                                                 (void __user *)arg);
2794                 break;
2795         default:
2796                 result = -EINVAL;
2797                 break;
2798         }
2799         snd_leave_user(fs);
2800         return result;
2801 }
2802
2803 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2804
2805 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2806                             loff_t * offset)
2807 {
2808         struct snd_pcm_file *pcm_file;
2809         struct snd_pcm_substream *substream;
2810         struct snd_pcm_runtime *runtime;
2811         snd_pcm_sframes_t result;
2812
2813         pcm_file = file->private_data;
2814         substream = pcm_file->substream;
2815         snd_assert(substream != NULL, return -ENXIO);
2816         runtime = substream->runtime;
2817         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2818                 return -EBADFD;
2819         if (!frame_aligned(runtime, count))
2820                 return -EINVAL;
2821         count = bytes_to_frames(runtime, count);
2822         result = snd_pcm_lib_read(substream, buf, count);
2823         if (result > 0)
2824                 result = frames_to_bytes(runtime, result);
2825         return result;
2826 }
2827
2828 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2829                              size_t count, loff_t * offset)
2830 {
2831         struct snd_pcm_file *pcm_file;
2832         struct snd_pcm_substream *substream;
2833         struct snd_pcm_runtime *runtime;
2834         snd_pcm_sframes_t result;
2835
2836         pcm_file = file->private_data;
2837         substream = pcm_file->substream;
2838         snd_assert(substream != NULL, result = -ENXIO; goto end);
2839         runtime = substream->runtime;
2840         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2841                 result = -EBADFD;
2842                 goto end;
2843         }
2844         if (!frame_aligned(runtime, count)) {
2845                 result = -EINVAL;
2846                 goto end;
2847         }
2848         count = bytes_to_frames(runtime, count);
2849         result = snd_pcm_lib_write(substream, buf, count);
2850         if (result > 0)
2851                 result = frames_to_bytes(runtime, result);
2852  end:
2853         return result;
2854 }
2855
2856 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2857                              unsigned long nr_segs, loff_t pos)
2858
2859 {
2860         struct snd_pcm_file *pcm_file;
2861         struct snd_pcm_substream *substream;
2862         struct snd_pcm_runtime *runtime;
2863         snd_pcm_sframes_t result;
2864         unsigned long i;
2865         void __user **bufs;
2866         snd_pcm_uframes_t frames;
2867
2868         pcm_file = iocb->ki_filp->private_data;
2869         substream = pcm_file->substream;
2870         snd_assert(substream != NULL, return -ENXIO);
2871         runtime = substream->runtime;
2872         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2873                 return -EBADFD;
2874         if (nr_segs > 1024 || nr_segs != runtime->channels)
2875                 return -EINVAL;
2876         if (!frame_aligned(runtime, iov->iov_len))
2877                 return -EINVAL;
2878         frames = bytes_to_samples(runtime, iov->iov_len);
2879         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2880         if (bufs == NULL)
2881                 return -ENOMEM;
2882         for (i = 0; i < nr_segs; ++i)
2883                 bufs[i] = iov[i].iov_base;
2884         result = snd_pcm_lib_readv(substream, bufs, frames);
2885         if (result > 0)
2886                 result = frames_to_bytes(runtime, result);
2887         kfree(bufs);
2888         return result;
2889 }
2890
2891 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2892                               unsigned long nr_segs, loff_t pos)
2893 {
2894         struct snd_pcm_file *pcm_file;
2895         struct snd_pcm_substream *substream;
2896         struct snd_pcm_runtime *runtime;
2897         snd_pcm_sframes_t result;
2898         unsigned long i;
2899         void __user **bufs;
2900         snd_pcm_uframes_t frames;
2901
2902         pcm_file = iocb->ki_filp->private_data;
2903         substream = pcm_file->substream;
2904         snd_assert(substream != NULL, result = -ENXIO; goto end);
2905         runtime = substream->runtime;
2906         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2907                 result = -EBADFD;
2908                 goto end;
2909         }
2910         if (nr_segs > 128 || nr_segs != runtime->channels ||
2911             !frame_aligned(runtime, iov->iov_len)) {
2912                 result = -EINVAL;
2913                 goto end;
2914         }
2915         frames = bytes_to_samples(runtime, iov->iov_len);
2916         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2917         if (bufs == NULL)
2918                 return -ENOMEM;
2919         for (i = 0; i < nr_segs; ++i)
2920                 bufs[i] = iov[i].iov_base;
2921         result = snd_pcm_lib_writev(substream, bufs, frames);
2922         if (result > 0)
2923                 result = frames_to_bytes(runtime, result);
2924         kfree(bufs);
2925  end:
2926         return result;
2927 }
2928
2929 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2930 {
2931         struct snd_pcm_file *pcm_file;
2932         struct snd_pcm_substream *substream;
2933         struct snd_pcm_runtime *runtime;
2934         unsigned int mask;
2935         snd_pcm_uframes_t avail;
2936
2937         pcm_file = file->private_data;
2938
2939         substream = pcm_file->substream;
2940         snd_assert(substream != NULL, return -ENXIO);
2941         runtime = substream->runtime;
2942
2943         poll_wait(file, &runtime->sleep, wait);
2944
2945         snd_pcm_stream_lock_irq(substream);
2946         avail = snd_pcm_playback_avail(runtime);
2947         switch (runtime->status->state) {
2948         case SNDRV_PCM_STATE_RUNNING:
2949         case SNDRV_PCM_STATE_PREPARED:
2950         case SNDRV_PCM_STATE_PAUSED:
2951                 if (avail >= runtime->control->avail_min) {
2952                         mask = POLLOUT | POLLWRNORM;
2953                         break;
2954                 }
2955                 /* Fall through */
2956         case SNDRV_PCM_STATE_DRAINING:
2957                 mask = 0;
2958                 break;
2959         default:
2960                 mask = POLLOUT | POLLWRNORM | POLLERR;
2961                 break;
2962         }
2963         snd_pcm_stream_unlock_irq(substream);
2964         return mask;
2965 }
2966
2967 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2968 {
2969         struct snd_pcm_file *pcm_file;
2970         struct snd_pcm_substream *substream;
2971         struct snd_pcm_runtime *runtime;
2972         unsigned int mask;
2973         snd_pcm_uframes_t avail;
2974
2975         pcm_file = file->private_data;
2976
2977         substream = pcm_file->substream;
2978         snd_assert(substream != NULL, return -ENXIO);
2979         runtime = substream->runtime;
2980
2981         poll_wait(file, &runtime->sleep, wait);
2982
2983         snd_pcm_stream_lock_irq(substream);
2984         avail = snd_pcm_capture_avail(runtime);
2985         switch (runtime->status->state) {
2986         case SNDRV_PCM_STATE_RUNNING:
2987         case SNDRV_PCM_STATE_PREPARED:
2988         case SNDRV_PCM_STATE_PAUSED:
2989                 if (avail >= runtime->control->avail_min) {
2990                         mask = POLLIN | POLLRDNORM;
2991                         break;
2992                 }
2993                 mask = 0;
2994                 break;
2995         case SNDRV_PCM_STATE_DRAINING:
2996                 if (avail > 0) {
2997                         mask = POLLIN | POLLRDNORM;
2998                         break;
2999                 }
3000                 /* Fall through */
3001         default:
3002                 mask = POLLIN | POLLRDNORM | POLLERR;
3003                 break;
3004         }
3005         snd_pcm_stream_unlock_irq(substream);
3006         return mask;
3007 }
3008
3009 /*
3010  * mmap support
3011  */
3012
3013 /*
3014  * Only on coherent architectures, we can mmap the status and the control records
3015  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3016  */
3017 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3018 /*
3019  * mmap status record
3020  */
3021 static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area,
3022                                                 unsigned long address, int *type)
3023 {
3024         struct snd_pcm_substream *substream = area->vm_private_data;
3025         struct snd_pcm_runtime *runtime;
3026         struct page * page;
3027
3028         if (substream == NULL)
3029                 return NOPAGE_SIGBUS;
3030         runtime = substream->runtime;
3031         page = virt_to_page(runtime->status);
3032         get_page(page);
3033         if (type)
3034                 *type = VM_FAULT_MINOR;
3035         return page;
3036 }
3037
3038 static struct vm_operations_struct snd_pcm_vm_ops_status =
3039 {
3040         .nopage =       snd_pcm_mmap_status_nopage,
3041 };
3042
3043 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3044                                struct vm_area_struct *area)
3045 {
3046         struct snd_pcm_runtime *runtime;
3047         long size;
3048         if (!(area->vm_flags & VM_READ))
3049                 return -EINVAL;
3050         runtime = substream->runtime;
3051         snd_assert(runtime != NULL, return -EAGAIN);
3052         size = area->vm_end - area->vm_start;
3053         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3054                 return -EINVAL;
3055         area->vm_ops = &snd_pcm_vm_ops_status;
3056         area->vm_private_data = substream;
3057         area->vm_flags |= VM_RESERVED;
3058         return 0;
3059 }
3060
3061 /*
3062  * mmap control record
3063  */
3064 static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area,
3065                                                  unsigned long address, int *type)
3066 {
3067         struct snd_pcm_substream *substream = area->vm_private_data;
3068         struct snd_pcm_runtime *runtime;
3069         struct page * page;
3070
3071         if (substream == NULL)
3072                 return NOPAGE_SIGBUS;
3073         runtime = substream->runtime;
3074         page = virt_to_page(runtime->control);
3075         get_page(page);
3076         if (type)
3077                 *type = VM_FAULT_MINOR;
3078         return page;
3079 }
3080
3081 static struct vm_operations_struct snd_pcm_vm_ops_control =
3082 {
3083         .nopage =       snd_pcm_mmap_control_nopage,
3084 };
3085
3086 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3087                                 struct vm_area_struct *area)
3088 {
3089         struct snd_pcm_runtime *runtime;
3090         long size;
3091         if (!(area->vm_flags & VM_READ))
3092                 return -EINVAL;
3093         runtime = substream->runtime;
3094         snd_assert(runtime != NULL, return -EAGAIN);
3095         size = area->vm_end - area->vm_start;
3096         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3097                 return -EINVAL;
3098         area->vm_ops = &snd_pcm_vm_ops_control;
3099         area->vm_private_data = substream;
3100         area->vm_flags |= VM_RESERVED;
3101         return 0;
3102 }
3103 #else /* ! coherent mmap */
3104 /*
3105  * don't support mmap for status and control records.
3106  */
3107 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3108                                struct vm_area_struct *area)
3109 {
3110         return -ENXIO;
3111 }
3112 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3113                                 struct vm_area_struct *area)
3114 {
3115         return -ENXIO;
3116 }
3117 #endif /* coherent mmap */
3118
3119 /*
3120  * nopage callback for mmapping a RAM page
3121  */
3122 static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area,
3123                                              unsigned long address, int *type)
3124 {
3125         struct snd_pcm_substream *substream = area->vm_private_data;
3126         struct snd_pcm_runtime *runtime;
3127         unsigned long offset;
3128         struct page * page;
3129         void *vaddr;
3130         size_t dma_bytes;
3131
3132         if (substream == NULL)
3133                 return NOPAGE_SIGBUS;
3134         runtime = substream->runtime;
3135         offset = area->vm_pgoff << PAGE_SHIFT;
3136         offset += address - area->vm_start;
3137         snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_SIGBUS);
3138         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3139         if (offset > dma_bytes - PAGE_SIZE)
3140                 return NOPAGE_SIGBUS;
3141         if (substream->ops->page) {
3142                 page = substream->ops->page(substream, offset);
3143                 if (! page)
3144                         return NOPAGE_OOM; /* XXX: is this really due to OOM? */
3145         } else {
3146                 vaddr = runtime->dma_area + offset;
3147                 page = virt_to_page(vaddr);
3148         }
3149         get_page(page);
3150         if (type)
3151                 *type = VM_FAULT_MINOR;
3152         return page;
3153 }
3154
3155 static struct vm_operations_struct snd_pcm_vm_ops_data =
3156 {
3157         .open =         snd_pcm_mmap_data_open,
3158         .close =        snd_pcm_mmap_data_close,
3159         .nopage =       snd_pcm_mmap_data_nopage,
3160 };
3161
3162 /*
3163  * mmap the DMA buffer on RAM
3164  */
3165 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3166                                 struct vm_area_struct *area)
3167 {
3168         area->vm_ops = &snd_pcm_vm_ops_data;
3169         area->vm_private_data = substream;
3170         area->vm_flags |= VM_RESERVED;
3171         atomic_inc(&substream->mmap_count);
3172         return 0;
3173 }
3174
3175 /*
3176  * mmap the DMA buffer on I/O memory area
3177  */
3178 #if SNDRV_PCM_INFO_MMAP_IOMEM
3179 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3180 {
3181         .open =         snd_pcm_mmap_data_open,
3182         .close =        snd_pcm_mmap_data_close,
3183 };
3184
3185 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3186                            struct vm_area_struct *area)
3187 {
3188         long size;
3189         unsigned long offset;
3190
3191 #ifdef pgprot_noncached
3192         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3193 #endif
3194         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3195         area->vm_private_data = substream;
3196         area->vm_flags |= VM_IO;
3197         size = area->vm_end - area->vm_start;
3198         offset = area->vm_pgoff << PAGE_SHIFT;
3199         if (io_remap_pfn_range(area, area->vm_start,
3200                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3201                                 size, area->vm_page_prot))
3202                 return -EAGAIN;
3203         atomic_inc(&substream->mmap_count);
3204         return 0;
3205 }
3206
3207 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3208 #endif /* SNDRV_PCM_INFO_MMAP */
3209
3210 /*
3211  * mmap DMA buffer
3212  */
3213 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3214                       struct vm_area_struct *area)
3215 {
3216         struct snd_pcm_runtime *runtime;
3217         long size;
3218         unsigned long offset;
3219         size_t dma_bytes;
3220
3221         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3222                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3223                         return -EINVAL;
3224         } else {
3225                 if (!(area->vm_flags & VM_READ))
3226                         return -EINVAL;
3227         }
3228         runtime = substream->runtime;
3229         snd_assert(runtime != NULL, return -EAGAIN);
3230         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3231                 return -EBADFD;
3232         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3233                 return -ENXIO;
3234         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3235             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3236                 return -EINVAL;
3237         size = area->vm_end - area->vm_start;
3238         offset = area->vm_pgoff << PAGE_SHIFT;
3239         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3240         if ((size_t)size > dma_bytes)
3241                 return -EINVAL;
3242         if (offset > dma_bytes - size)
3243                 return -EINVAL;
3244
3245         if (substream->ops->mmap)
3246                 return substream->ops->mmap(substream, area);
3247         else
3248                 return snd_pcm_default_mmap(substream, area);
3249 }
3250
3251 EXPORT_SYMBOL(snd_pcm_mmap_data);
3252
3253 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3254 {
3255         struct snd_pcm_file * pcm_file;
3256         struct snd_pcm_substream *substream;
3257         unsigned long offset;
3258
3259         pcm_file = file->private_data;
3260         substream = pcm_file->substream;
3261         snd_assert(substream != NULL, return -ENXIO);
3262
3263         offset = area->vm_pgoff << PAGE_SHIFT;
3264         switch (offset) {
3265         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3266                 if (pcm_file->no_compat_mmap)
3267                         return -ENXIO;
3268                 return snd_pcm_mmap_status(substream, file, area);
3269         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3270                 if (pcm_file->no_compat_mmap)
3271                         return -ENXIO;
3272                 return snd_pcm_mmap_control(substream, file, area);
3273         default:
3274                 return snd_pcm_mmap_data(substream, file, area);
3275         }
3276         return 0;
3277 }
3278
3279 static int snd_pcm_fasync(int fd, struct file * file, int on)
3280 {
3281         struct snd_pcm_file * pcm_file;
3282         struct snd_pcm_substream *substream;
3283         struct snd_pcm_runtime *runtime;
3284         int err;
3285
3286         pcm_file = file->private_data;
3287         substream = pcm_file->substream;
3288         snd_assert(substream != NULL, return -ENXIO);
3289         runtime = substream->runtime;
3290
3291         err = fasync_helper(fd, file, on, &runtime->fasync);
3292         if (err < 0)
3293                 return err;
3294         return 0;
3295 }
3296
3297 /*
3298  * ioctl32 compat
3299  */
3300 #ifdef CONFIG_COMPAT
3301 #include "pcm_compat.c"
3302 #else
3303 #define snd_pcm_ioctl_compat    NULL
3304 #endif
3305
3306 /*
3307  *  To be removed helpers to keep binary compatibility
3308  */
3309
3310 #ifdef CONFIG_SND_SUPPORT_OLD_API
3311 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3312 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3313
3314 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3315                                                struct snd_pcm_hw_params_old *oparams)
3316 {
3317         unsigned int i;
3318
3319         memset(params, 0, sizeof(*params));
3320         params->flags = oparams->flags;
3321         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3322                 params->masks[i].bits[0] = oparams->masks[i];
3323         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3324         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3325         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3326         params->info = oparams->info;
3327         params->msbits = oparams->msbits;
3328         params->rate_num = oparams->rate_num;
3329         params->rate_den = oparams->rate_den;
3330         params->fifo_size = oparams->fifo_size;
3331 }
3332
3333 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3334                                              struct snd_pcm_hw_params *params)
3335 {
3336         unsigned int i;
3337
3338         memset(oparams, 0, sizeof(*oparams));
3339         oparams->flags = params->flags;
3340         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3341                 oparams->masks[i] = params->masks[i].bits[0];
3342         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3343         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3344         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3345         oparams->info = params->info;
3346         oparams->msbits = params->msbits;
3347         oparams->rate_num = params->rate_num;
3348         oparams->rate_den = params->rate_den;
3349         oparams->fifo_size = params->fifo_size;
3350 }
3351
3352 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3353                                       struct snd_pcm_hw_params_old __user * _oparams)
3354 {
3355         struct snd_pcm_hw_params *params;
3356         struct snd_pcm_hw_params_old *oparams = NULL;
3357         int err;
3358
3359         params = kmalloc(sizeof(*params), GFP_KERNEL);
3360         if (!params) {
3361                 err = -ENOMEM;
3362                 goto out;
3363         }
3364         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3365         if (!oparams) {
3366                 err = -ENOMEM;
3367                 goto out;
3368         }
3369
3370         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3371                 err = -EFAULT;
3372                 goto out;
3373         }
3374         snd_pcm_hw_convert_from_old_params(params, oparams);
3375         err = snd_pcm_hw_refine(substream, params);
3376         snd_pcm_hw_convert_to_old_params(oparams, params);
3377         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3378                 if (!err)
3379                         err = -EFAULT;
3380         }
3381 out:
3382         kfree(params);
3383         kfree(oparams);
3384         return err;
3385 }
3386
3387 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3388                                       struct snd_pcm_hw_params_old __user * _oparams)
3389 {
3390         struct snd_pcm_hw_params *params;
3391         struct snd_pcm_hw_params_old *oparams = NULL;
3392         int err;
3393
3394         params = kmalloc(sizeof(*params), GFP_KERNEL);
3395         if (!params) {
3396                 err = -ENOMEM;
3397                 goto out;
3398         }
3399         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3400         if (!oparams) {
3401                 err = -ENOMEM;
3402                 goto out;
3403         }
3404         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3405                 err = -EFAULT;
3406                 goto out;
3407         }
3408         snd_pcm_hw_convert_from_old_params(params, oparams);
3409         err = snd_pcm_hw_params(substream, params);
3410         snd_pcm_hw_convert_to_old_params(oparams, params);
3411         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3412                 if (!err)
3413                         err = -EFAULT;
3414         }
3415 out:
3416         kfree(params);
3417         kfree(oparams);
3418         return err;
3419 }
3420 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3421
3422 /*
3423  *  Register section
3424  */
3425
3426 const struct file_operations snd_pcm_f_ops[2] = {
3427         {
3428                 .owner =                THIS_MODULE,
3429                 .write =                snd_pcm_write,
3430                 .aio_write =            snd_pcm_aio_write,
3431                 .open =                 snd_pcm_playback_open,
3432                 .release =              snd_pcm_release,
3433                 .poll =                 snd_pcm_playback_poll,
3434                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3435                 .compat_ioctl =         snd_pcm_ioctl_compat,
3436                 .mmap =                 snd_pcm_mmap,
3437                 .fasync =               snd_pcm_fasync,
3438         },
3439         {
3440                 .owner =                THIS_MODULE,
3441                 .read =                 snd_pcm_read,
3442                 .aio_read =             snd_pcm_aio_read,
3443                 .open =                 snd_pcm_capture_open,
3444                 .release =              snd_pcm_release,
3445                 .poll =                 snd_pcm_capture_poll,
3446                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3447                 .compat_ioctl =         snd_pcm_ioctl_compat,
3448                 .mmap =                 snd_pcm_mmap,
3449                 .fasync =               snd_pcm_fasync,
3450         }
3451 };