sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/file.h>
  24 #include <linux/slab.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/time.h>
  27 #include <linux/pm_qos_params.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         memset(info, 0, sizeof(*info));
  99         info->card = pcm->card->number;
 100         info->device = pcm->device;
 101         info->stream = substream->stream;
 102         info->subdevice = substream->number;
 103         strlcpy(info->id, pcm->id, sizeof(info->id));
 104         strlcpy(info->name, pcm->name, sizeof(info->name));
 105         info->dev_class = pcm->dev_class;
 106         info->dev_subclass = pcm->dev_subclass;
 107         info->subdevices_count = pstr->substream_count;
 108         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 109         strlcpy(info->subname, substream->name, sizeof(info->subname));
 110         runtime = substream->runtime;
 111         /* AB: FIXME!!! This is definitely nonsense */
 112         if (runtime) {
 113                 info->sync = runtime->sync;
 114                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 115         }
 116         return 0;
 117 }
 118
 119 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 120                       struct snd_pcm_info __user * _info)
 121 {
 122         struct snd_pcm_info *info;
 123         int err;
 124
 125         info = kmalloc(sizeof(*info), GFP_KERNEL);
 126         if (! info)
 127                 return -ENOMEM;
 128         err = snd_pcm_info(substream, info);
 129         if (err >= 0) {
 130                 if (copy_to_user(_info, info, sizeof(*info)))
 131                         err = -EFAULT;
 132         }
 133         kfree(info);
 134         return err;
 135 }
 136
 137 #undef RULES_DEBUG
 138
 139 #ifdef RULES_DEBUG
 140 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 141 char *snd_pcm_hw_param_names[] = {
 142         HW_PARAM(ACCESS),
 143         HW_PARAM(FORMAT),
 144         HW_PARAM(SUBFORMAT),
 145         HW_PARAM(SAMPLE_BITS),
 146         HW_PARAM(FRAME_BITS),
 147         HW_PARAM(CHANNELS),
 148         HW_PARAM(RATE),
 149         HW_PARAM(PERIOD_TIME),
 150         HW_PARAM(PERIOD_SIZE),
 151         HW_PARAM(PERIOD_BYTES),
 152         HW_PARAM(PERIODS),
 153         HW_PARAM(BUFFER_TIME),
 154         HW_PARAM(BUFFER_SIZE),
 155         HW_PARAM(BUFFER_BYTES),
 156         HW_PARAM(TICK_TIME),
 157 };
 158 #endif
 159
 160 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 161                       struct snd_pcm_hw_params *params)
 162 {
 163         unsigned int k;
 164         struct snd_pcm_hardware *hw;
 165         struct snd_interval *i = NULL;
 166         struct snd_mask *m = NULL;
 167         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 168         unsigned int rstamps[constrs->rules_num];
 169         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 170         unsigned int stamp = 2;
 171         int changed, again;
 172
 173         params->info = 0;
 174         params->fifo_size = 0;
 175         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 176                 params->msbits = 0;
 177         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 178                 params->rate_num = 0;
 179                 params->rate_den = 0;
 180         }
 181
 182         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 183                 m = hw_param_mask(params, k);
 184                 if (snd_mask_empty(m))
 185                         return -EINVAL;
 186                 if (!(params->rmask & (1 << k)))
 187                         continue;
 188 #ifdef RULES_DEBUG
 189                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 190                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 191 #endif
 192                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 193 #ifdef RULES_DEBUG
 194                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 if (changed)
 197                         params->cmask |= 1 << k;
 198                 if (changed < 0)
 199                         return changed;
 200         }
 201
 202         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 203                 i = hw_param_interval(params, k);
 204                 if (snd_interval_empty(i))
 205                         return -EINVAL;
 206                 if (!(params->rmask & (1 << k)))
 207                         continue;
 208 #ifdef RULES_DEBUG
 209                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 210                 if (i->empty)
 211                         printk("empty");
 212                 else
 213                         printk("%c%u %u%c",
 214                                i->openmin ? '(' : '[', i->min,
 215                                i->max, i->openmax ? ')' : ']');
 216                 printk(" -> ");
 217 #endif
 218                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 219 #ifdef RULES_DEBUG
 220                 if (i->empty)
 221                         printk("empty\n");
 222                 else
 223                         printk("%c%u %u%c\n",
 224                                i->openmin ? '(' : '[', i->min,
 225                                i->max, i->openmax ? ')' : ']');
 226 #endif
 227                 if (changed)
 228                         params->cmask |= 1 << k;
 229                 if (changed < 0)
 230                         return changed;
 231         }
 232
 233         for (k = 0; k < constrs->rules_num; k++)
 234                 rstamps[k] = 0;
 235         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 236                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 237         do {
 238                 again = 0;
 239                 for (k = 0; k < constrs->rules_num; k++) {
 240                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 241                         unsigned int d;
 242                         int doit = 0;
 243                         if (r->cond && !(r->cond & params->flags))
 244                                 continue;
 245                         for (d = 0; r->deps[d] >= 0; d++) {
 246                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 247                                         doit = 1;
 248                                         break;
 249                                 }
 250                         }
 251                         if (!doit)
 252                                 continue;
 253 #ifdef RULES_DEBUG
 254                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 255                         if (r->var >= 0) {
 256                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 257                                 if (hw_is_mask(r->var)) {
 258                                         m = hw_param_mask(params, r->var);
 259                                         printk("%x", *m->bits);
 260                                 } else {
 261                                         i = hw_param_interval(params, r->var);
 262                                         if (i->empty)
 263                                                 printk("empty");
 264                                         else
 265                                                 printk("%c%u %u%c",
 266                                                        i->openmin ? '(' : '[', i->min,
 267                                                        i->max, i->openmax ? ')' : ']');
 268                                 }
 269                         }
 270 #endif
 271                         changed = r->func(params, r);
 272 #ifdef RULES_DEBUG
 273                         if (r->var >= 0) {
 274                                 printk(" -> ");
 275                                 if (hw_is_mask(r->var))
 276                                         printk("%x", *m->bits);
 277                                 else {
 278                                         if (i->empty)
 279                                                 printk("empty");
 280                                         else
 281                                                 printk("%c%u %u%c",
 282                                                        i->openmin ? '(' : '[', i->min,
 283                                                        i->max, i->openmax ? ')' : ']');
 284                                 }
 285                         }
 286                         printk("\n");
 287 #endif
 288                         rstamps[k] = stamp;
 289                         if (changed && r->var >= 0) {
 290                                 params->cmask |= (1 << r->var);
 291                                 vstamps[r->var] = stamp;
 292                                 again = 1;
 293                         }
 294                         if (changed < 0)
 295                                 return changed;
 296                         stamp++;
 297                 }
 298         } while (again);
 299         if (!params->msbits) {
 300                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 301                 if (snd_interval_single(i))
 302                         params->msbits = snd_interval_value(i);
 303         }
 304
 305         if (!params->rate_den) {
 306                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 307                 if (snd_interval_single(i)) {
 308                         params->rate_num = snd_interval_value(i);
 309                         params->rate_den = 1;
 310                 }
 311         }
 312
 313         hw = &substream->runtime->hw;
 314         if (!params->info)
 315                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 316         if (!params->fifo_size) {
 317                 if (snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) ==
 318                     snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) &&
 319                     snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS]) ==
 320                     snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS])) {
 321                         changed = substream->ops->ioctl(substream,
 322                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 323                         if (params < 0)
 324                                 return changed;
 325                 }
 326         }
 327         params->rmask = 0;
 328         return 0;
 329 }
 330
 331 EXPORT_SYMBOL(snd_pcm_hw_refine);
 332
 333 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 334                                   struct snd_pcm_hw_params __user * _params)
 335 {
 336         struct snd_pcm_hw_params *params;
 337         int err;
 338
 339         params = memdup_user(_params, sizeof(*params));
 340         if (IS_ERR(params))
 341                 return PTR_ERR(params);
 342
 343         err = snd_pcm_hw_refine(substream, params);
 344         if (copy_to_user(_params, params, sizeof(*params))) {
 345                 if (!err)
 346                         err = -EFAULT;
 347         }
 348
 349         kfree(params);
 350         return err;
 351 }
 352
 353 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 354 {
 355         int usecs;
 356
 357         if (! runtime->rate)
 358                 return -1; /* invalid */
 359
 360         /* take 75% of period time as the deadline */
 361         usecs = (750000 / runtime->rate) * runtime->period_size;
 362         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 363                 runtime->rate;
 364
 365         return usecs;
 366 }
 367
 368 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 369                              struct snd_pcm_hw_params *params)
 370 {
 371         struct snd_pcm_runtime *runtime;
 372         int err, usecs;
 373         unsigned int bits;
 374         snd_pcm_uframes_t frames;
 375
 376         if (PCM_RUNTIME_CHECK(substream))
 377                 return -ENXIO;
 378         runtime = substream->runtime;
 379         snd_pcm_stream_lock_irq(substream);
 380         switch (runtime->status->state) {
 381         case SNDRV_PCM_STATE_OPEN:
 382         case SNDRV_PCM_STATE_SETUP:
 383         case SNDRV_PCM_STATE_PREPARED:
 384                 break;
 385         default:
 386                 snd_pcm_stream_unlock_irq(substream);
 387                 return -EBADFD;
 388         }
 389         snd_pcm_stream_unlock_irq(substream);
 390 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 391         if (!substream->oss.oss)
 392 #endif
 393                 if (atomic_read(&substream->mmap_count))
 394                         return -EBADFD;
 395
 396         params->rmask = ~0U;
 397         err = snd_pcm_hw_refine(substream, params);
 398         if (err < 0)
 399                 goto _error;
 400
 401         err = snd_pcm_hw_params_choose(substream, params);
 402         if (err < 0)
 403                 goto _error;
 404
 405         if (substream->ops->hw_params != NULL) {
 406                 err = substream->ops->hw_params(substream, params);
 407                 if (err < 0)
 408                         goto _error;
 409         }
 410
 411         runtime->access = params_access(params);
 412         runtime->format = params_format(params);
 413         runtime->subformat = params_subformat(params);
 414         runtime->channels = params_channels(params);
 415         runtime->rate = params_rate(params);
 416         runtime->period_size = params_period_size(params);
 417         runtime->periods = params_periods(params);
 418         runtime->buffer_size = params_buffer_size(params);
 419         runtime->info = params->info;
 420         runtime->rate_num = params->rate_num;
 421         runtime->rate_den = params->rate_den;
 422
 423         bits = snd_pcm_format_physical_width(runtime->format);
 424         runtime->sample_bits = bits;
 425         bits *= runtime->channels;
 426         runtime->frame_bits = bits;
 427         frames = 1;
 428         while (bits % 8 != 0) {
 429                 bits *= 2;
 430                 frames *= 2;
 431         }
 432         runtime->byte_align = bits / 8;
 433         runtime->min_align = frames;
 434
 435         /* Default sw params */
 436         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 437         runtime->period_step = 1;
 438         runtime->control->avail_min = 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         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 451                                 substream->latency_id);
 452         if ((usecs = period_to_usecs(runtime)) >= 0)
 453                 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
 454                                         substream->latency_id, usecs);
 455         return 0;
 456  _error:
 457         /* hardware might be unuseable from this time,
 458            so we force application to retry to set
 459            the correct hardware parameter settings */
 460         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 461         if (substream->ops->hw_free != NULL)
 462                 substream->ops->hw_free(substream);
 463         return err;
 464 }
 465
 466 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 467                                   struct snd_pcm_hw_params __user * _params)
 468 {
 469         struct snd_pcm_hw_params *params;
 470         int err;
 471
 472         params = memdup_user(_params, sizeof(*params));
 473         if (IS_ERR(params))
 474                 return PTR_ERR(params);
 475
 476         err = snd_pcm_hw_params(substream, params);
 477         if (copy_to_user(_params, params, sizeof(*params))) {
 478                 if (!err)
 479                         err = -EFAULT;
 480         }
 481
 482         kfree(params);
 483         return err;
 484 }
 485
 486 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 487 {
 488         struct snd_pcm_runtime *runtime;
 489         int result = 0;
 490
 491         if (PCM_RUNTIME_CHECK(substream))
 492                 return -ENXIO;
 493         runtime = substream->runtime;
 494         snd_pcm_stream_lock_irq(substream);
 495         switch (runtime->status->state) {
 496         case SNDRV_PCM_STATE_SETUP:
 497         case SNDRV_PCM_STATE_PREPARED:
 498                 break;
 499         default:
 500                 snd_pcm_stream_unlock_irq(substream);
 501                 return -EBADFD;
 502         }
 503         snd_pcm_stream_unlock_irq(substream);
 504         if (atomic_read(&substream->mmap_count))
 505                 return -EBADFD;
 506         if (substream->ops->hw_free)
 507                 result = substream->ops->hw_free(substream);
 508         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 509         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 510                 substream->latency_id);
 511         return result;
 512 }
 513
 514 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 515                              struct snd_pcm_sw_params *params)
 516 {
 517         struct snd_pcm_runtime *runtime;
 518
 519         if (PCM_RUNTIME_CHECK(substream))
 520                 return -ENXIO;
 521         runtime = substream->runtime;
 522         snd_pcm_stream_lock_irq(substream);
 523         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 524                 snd_pcm_stream_unlock_irq(substream);
 525                 return -EBADFD;
 526         }
 527         snd_pcm_stream_unlock_irq(substream);
 528
 529         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 530                 return -EINVAL;
 531         if (params->avail_min == 0)
 532                 return -EINVAL;
 533         if (params->silence_size >= runtime->boundary) {
 534                 if (params->silence_threshold != 0)
 535                         return -EINVAL;
 536         } else {
 537                 if (params->silence_size > params->silence_threshold)
 538                         return -EINVAL;
 539                 if (params->silence_threshold > runtime->buffer_size)
 540                         return -EINVAL;
 541         }
 542         snd_pcm_stream_lock_irq(substream);
 543         runtime->tstamp_mode = params->tstamp_mode;
 544         runtime->period_step = params->period_step;
 545         runtime->control->avail_min = params->avail_min;
 546         runtime->start_threshold = params->start_threshold;
 547         runtime->stop_threshold = params->stop_threshold;
 548         runtime->silence_threshold = params->silence_threshold;
 549         runtime->silence_size = params->silence_size;
 550         params->boundary = runtime->boundary;
 551         if (snd_pcm_running(substream)) {
 552                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 553                     runtime->silence_size > 0)
 554                         snd_pcm_playback_silence(substream, ULONG_MAX);
 555                 wake_up(&runtime->sleep);
 556         }
 557         snd_pcm_stream_unlock_irq(substream);
 558         return 0;
 559 }
 560
 561 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 562                                   struct snd_pcm_sw_params __user * _params)
 563 {
 564         struct snd_pcm_sw_params params;
 565         int err;
 566         if (copy_from_user(&params, _params, sizeof(params)))
 567                 return -EFAULT;
 568         err = snd_pcm_sw_params(substream, &params);
 569         if (copy_to_user(_params, &params, sizeof(params)))
 570                 return -EFAULT;
 571         return err;
 572 }
 573
 574 int snd_pcm_status(struct snd_pcm_substream *substream,
 575                    struct snd_pcm_status *status)
 576 {
 577         struct snd_pcm_runtime *runtime = substream->runtime;
 578
 579         snd_pcm_stream_lock_irq(substream);
 580         status->state = runtime->status->state;
 581         status->suspended_state = runtime->status->suspended_state;
 582         if (status->state == SNDRV_PCM_STATE_OPEN)
 583                 goto _end;
 584         status->trigger_tstamp = runtime->trigger_tstamp;
 585         if (snd_pcm_running(substream)) {
 586                 snd_pcm_update_hw_ptr(substream);
 587                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 588                         status->tstamp = runtime->status->tstamp;
 589                         goto _tstamp_end;
 590                 }
 591         }
 592         snd_pcm_gettime(runtime, &status->tstamp);
 593  _tstamp_end:
 594         status->appl_ptr = runtime->control->appl_ptr;
 595         status->hw_ptr = runtime->status->hw_ptr;
 596         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 597                 status->avail = snd_pcm_playback_avail(runtime);
 598                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 599                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 600                         status->delay = runtime->buffer_size - status->avail;
 601                         status->delay += runtime->delay;
 602                 } else
 603                         status->delay = 0;
 604         } else {
 605                 status->avail = snd_pcm_capture_avail(runtime);
 606                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 607                         status->delay = status->avail + runtime->delay;
 608                 else
 609                         status->delay = 0;
 610         }
 611         status->avail_max = runtime->avail_max;
 612         status->overrange = runtime->overrange;
 613         runtime->avail_max = 0;
 614         runtime->overrange = 0;
 615  _end:
 616         snd_pcm_stream_unlock_irq(substream);
 617         return 0;
 618 }
 619
 620 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 621                                struct snd_pcm_status __user * _status)
 622 {
 623         struct snd_pcm_status status;
 624         int res;
 625
 626         memset(&status, 0, sizeof(status));
 627         res = snd_pcm_status(substream, &status);
 628         if (res < 0)
 629                 return res;
 630         if (copy_to_user(_status, &status, sizeof(status)))
 631                 return -EFAULT;
 632         return 0;
 633 }
 634
 635 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 636                                 struct snd_pcm_channel_info * info)
 637 {
 638         struct snd_pcm_runtime *runtime;
 639         unsigned int channel;
 640
 641         channel = info->channel;
 642         runtime = substream->runtime;
 643         snd_pcm_stream_lock_irq(substream);
 644         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 645                 snd_pcm_stream_unlock_irq(substream);
 646                 return -EBADFD;
 647         }
 648         snd_pcm_stream_unlock_irq(substream);
 649         if (channel >= runtime->channels)
 650                 return -EINVAL;
 651         memset(info, 0, sizeof(*info));
 652         info->channel = channel;
 653         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 654 }
 655
 656 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 657                                      struct snd_pcm_channel_info __user * _info)
 658 {
 659         struct snd_pcm_channel_info info;
 660         int res;
 661
 662         if (copy_from_user(&info, _info, sizeof(info)))
 663                 return -EFAULT;
 664         res = snd_pcm_channel_info(substream, &info);
 665         if (res < 0)
 666                 return res;
 667         if (copy_to_user(_info, &info, sizeof(info)))
 668                 return -EFAULT;
 669         return 0;
 670 }
 671
 672 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 673 {
 674         struct snd_pcm_runtime *runtime = substream->runtime;
 675         if (runtime->trigger_master == NULL)
 676                 return;
 677         if (runtime->trigger_master == substream) {
 678                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 679         } else {
 680                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 681                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 682         }
 683         runtime->trigger_master = NULL;
 684 }
 685
 686 struct action_ops {
 687         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 688         int (*do_action)(struct snd_pcm_substream *substream, int state);
 689         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 690         void (*post_action)(struct snd_pcm_substream *substream, int state);
 691 };
 692
 693 /*
 694  *  this functions is core for handling of linked stream
 695  *  Note: the stream state might be changed also on failure
 696  *  Note2: call with calling stream lock + link lock
 697  */
 698 static int snd_pcm_action_group(struct action_ops *ops,
 699                                 struct snd_pcm_substream *substream,
 700                                 int state, int do_lock)
 701 {
 702         struct snd_pcm_substream *s = NULL;
 703         struct snd_pcm_substream *s1;
 704         int res = 0;
 705
 706         snd_pcm_group_for_each_entry(s, substream) {
 707                 if (do_lock && s != substream)
 708                         spin_lock_nested(&s->self_group.lock,
 709                                          SINGLE_DEPTH_NESTING);
 710                 res = ops->pre_action(s, state);
 711                 if (res < 0)
 712                         goto _unlock;
 713         }
 714         snd_pcm_group_for_each_entry(s, substream) {
 715                 res = ops->do_action(s, state);
 716                 if (res < 0) {
 717                         if (ops->undo_action) {
 718                                 snd_pcm_group_for_each_entry(s1, substream) {
 719                                         if (s1 == s) /* failed stream */
 720                                                 break;
 721                                         ops->undo_action(s1, state);
 722                                 }
 723                         }
 724                         s = NULL; /* unlock all */
 725                         goto _unlock;
 726                 }
 727         }
 728         snd_pcm_group_for_each_entry(s, substream) {
 729                 ops->post_action(s, state);
 730         }
 731  _unlock:
 732         if (do_lock) {
 733                 /* unlock streams */
 734                 snd_pcm_group_for_each_entry(s1, substream) {
 735                         if (s1 != substream)
 736                                 spin_unlock(&s1->self_group.lock);
 737                         if (s1 == s)    /* end */
 738                                 break;
 739                 }
 740         }
 741         return res;
 742 }
 743
 744 /*
 745  *  Note: call with stream lock
 746  */
 747 static int snd_pcm_action_single(struct action_ops *ops,
 748                                  struct snd_pcm_substream *substream,
 749                                  int state)
 750 {
 751         int res;
 752
 753         res = ops->pre_action(substream, state);
 754         if (res < 0)
 755                 return res;
 756         res = ops->do_action(substream, state);
 757         if (res == 0)
 758                 ops->post_action(substream, state);
 759         else if (ops->undo_action)
 760                 ops->undo_action(substream, state);
 761         return res;
 762 }
 763
 764 /*
 765  *  Note: call with stream lock
 766  */
 767 static int snd_pcm_action(struct action_ops *ops,
 768                           struct snd_pcm_substream *substream,
 769                           int state)
 770 {
 771         int res;
 772
 773         if (snd_pcm_stream_linked(substream)) {
 774                 if (!spin_trylock(&substream->group->lock)) {
 775                         spin_unlock(&substream->self_group.lock);
 776                         spin_lock(&substream->group->lock);
 777                         spin_lock(&substream->self_group.lock);
 778                 }
 779                 res = snd_pcm_action_group(ops, substream, state, 1);
 780                 spin_unlock(&substream->group->lock);
 781         } else {
 782                 res = snd_pcm_action_single(ops, substream, state);
 783         }
 784         return res;
 785 }
 786
 787 /*
 788  *  Note: don't use any locks before
 789  */
 790 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 791                                    struct snd_pcm_substream *substream,
 792                                    int state)
 793 {
 794         int res;
 795
 796         read_lock_irq(&snd_pcm_link_rwlock);
 797         if (snd_pcm_stream_linked(substream)) {
 798                 spin_lock(&substream->group->lock);
 799                 spin_lock(&substream->self_group.lock);
 800                 res = snd_pcm_action_group(ops, substream, state, 1);
 801                 spin_unlock(&substream->self_group.lock);
 802                 spin_unlock(&substream->group->lock);
 803         } else {
 804                 spin_lock(&substream->self_group.lock);
 805                 res = snd_pcm_action_single(ops, substream, state);
 806                 spin_unlock(&substream->self_group.lock);
 807         }
 808         read_unlock_irq(&snd_pcm_link_rwlock);
 809         return res;
 810 }
 811
 812 /*
 813  */
 814 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 815                                     struct snd_pcm_substream *substream,
 816                                     int state)
 817 {
 818         int res;
 819
 820         down_read(&snd_pcm_link_rwsem);
 821         if (snd_pcm_stream_linked(substream))
 822                 res = snd_pcm_action_group(ops, substream, state, 0);
 823         else
 824                 res = snd_pcm_action_single(ops, substream, state);
 825         up_read(&snd_pcm_link_rwsem);
 826         return res;
 827 }
 828
 829 /*
 830  * start callbacks
 831  */
 832 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 833 {
 834         struct snd_pcm_runtime *runtime = substream->runtime;
 835         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 836                 return -EBADFD;
 837         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 838             !snd_pcm_playback_data(substream))
 839                 return -EPIPE;
 840         runtime->trigger_master = substream;
 841         return 0;
 842 }
 843
 844 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 845 {
 846         if (substream->runtime->trigger_master != substream)
 847                 return 0;
 848         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 849 }
 850
 851 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 852 {
 853         if (substream->runtime->trigger_master == substream)
 854                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 855 }
 856
 857 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 858 {
 859         struct snd_pcm_runtime *runtime = substream->runtime;
 860         snd_pcm_trigger_tstamp(substream);
 861         runtime->hw_ptr_jiffies = jiffies;
 862         runtime->status->state = state;
 863         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 864             runtime->silence_size > 0)
 865                 snd_pcm_playback_silence(substream, ULONG_MAX);
 866         if (substream->timer)
 867                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 868                                  &runtime->trigger_tstamp);
 869 }
 870
 871 static struct action_ops snd_pcm_action_start = {
 872         .pre_action = snd_pcm_pre_start,
 873         .do_action = snd_pcm_do_start,
 874         .undo_action = snd_pcm_undo_start,
 875         .post_action = snd_pcm_post_start
 876 };
 877
 878 /**
 879  * snd_pcm_start - start all linked streams
 880  * @substream: the PCM substream instance
 881  */
 882 int snd_pcm_start(struct snd_pcm_substream *substream)
 883 {
 884         return snd_pcm_action(&snd_pcm_action_start, substream,
 885                               SNDRV_PCM_STATE_RUNNING);
 886 }
 887
 888 /*
 889  * stop callbacks
 890  */
 891 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 892 {
 893         struct snd_pcm_runtime *runtime = substream->runtime;
 894         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 895                 return -EBADFD;
 896         runtime->trigger_master = substream;
 897         return 0;
 898 }
 899
 900 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 901 {
 902         if (substream->runtime->trigger_master == substream &&
 903             snd_pcm_running(substream))
 904                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 905         return 0; /* unconditonally stop all substreams */
 906 }
 907
 908 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 909 {
 910         struct snd_pcm_runtime *runtime = substream->runtime;
 911         if (runtime->status->state != state) {
 912                 snd_pcm_trigger_tstamp(substream);
 913                 if (substream->timer)
 914                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 915                                          &runtime->trigger_tstamp);
 916                 runtime->status->state = state;
 917         }
 918         wake_up(&runtime->sleep);
 919 }
 920
 921 static struct action_ops snd_pcm_action_stop = {
 922         .pre_action = snd_pcm_pre_stop,
 923         .do_action = snd_pcm_do_stop,
 924         .post_action = snd_pcm_post_stop
 925 };
 926
 927 /**
 928  * snd_pcm_stop - try to stop all running streams in the substream group
 929  * @substream: the PCM substream instance
 930  * @state: PCM state after stopping the stream
 931  *
 932  * The state of each stream is then changed to the given state unconditionally.
 933  */
 934 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 935 {
 936         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 937 }
 938
 939 EXPORT_SYMBOL(snd_pcm_stop);
 940
 941 /**
 942  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 943  * @substream: the PCM substream
 944  *
 945  * After stopping, the state is changed to SETUP.
 946  * Unlike snd_pcm_stop(), this affects only the given stream.
 947  */
 948 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 949 {
 950         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 951                                      SNDRV_PCM_STATE_SETUP);
 952 }
 953
 954 /*
 955  * pause callbacks
 956  */
 957 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 958 {
 959         struct snd_pcm_runtime *runtime = substream->runtime;
 960         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 961                 return -ENOSYS;
 962         if (push) {
 963                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 964                         return -EBADFD;
 965         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 966                 return -EBADFD;
 967         runtime->trigger_master = substream;
 968         return 0;
 969 }
 970
 971 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 972 {
 973         if (substream->runtime->trigger_master != substream)
 974                 return 0;
 975         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
 976          * a delta betwen the current jiffies, this gives a large enough
 977          * delta, effectively to skip the check once.
 978          */
 979         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
 980         return substream->ops->trigger(substream,
 981                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 982                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 983 }
 984
 985 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 986 {
 987         if (substream->runtime->trigger_master == substream)
 988                 substream->ops->trigger(substream,
 989                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
 990                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 991 }
 992
 993 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
 994 {
 995         struct snd_pcm_runtime *runtime = substream->runtime;
 996         snd_pcm_trigger_tstamp(substream);
 997         if (push) {
 998                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
 999                 if (substream->timer)
1000                         snd_timer_notify(substream->timer,
1001                                          SNDRV_TIMER_EVENT_MPAUSE,
1002                                          &runtime->trigger_tstamp);
1003                 wake_up(&runtime->sleep);
1004         } else {
1005                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1006                 if (substream->timer)
1007                         snd_timer_notify(substream->timer,
1008                                          SNDRV_TIMER_EVENT_MCONTINUE,
1009                                          &runtime->trigger_tstamp);
1010         }
1011 }
1012
1013 static struct action_ops snd_pcm_action_pause = {
1014         .pre_action = snd_pcm_pre_pause,
1015         .do_action = snd_pcm_do_pause,
1016         .undo_action = snd_pcm_undo_pause,
1017         .post_action = snd_pcm_post_pause
1018 };
1019
1020 /*
1021  * Push/release the pause for all linked streams.
1022  */
1023 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1024 {
1025         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1026 }
1027
1028 #ifdef CONFIG_PM
1029 /* suspend */
1030
1031 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1032 {
1033         struct snd_pcm_runtime *runtime = substream->runtime;
1034         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1035                 return -EBUSY;
1036         runtime->trigger_master = substream;
1037         return 0;
1038 }
1039
1040 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1041 {
1042         struct snd_pcm_runtime *runtime = substream->runtime;
1043         if (runtime->trigger_master != substream)
1044                 return 0;
1045         if (! snd_pcm_running(substream))
1046                 return 0;
1047         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1048         return 0; /* suspend unconditionally */
1049 }
1050
1051 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1052 {
1053         struct snd_pcm_runtime *runtime = substream->runtime;
1054         snd_pcm_trigger_tstamp(substream);
1055         if (substream->timer)
1056                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1057                                  &runtime->trigger_tstamp);
1058         runtime->status->suspended_state = runtime->status->state;
1059         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1060         wake_up(&runtime->sleep);
1061 }
1062
1063 static struct action_ops snd_pcm_action_suspend = {
1064         .pre_action = snd_pcm_pre_suspend,
1065         .do_action = snd_pcm_do_suspend,
1066         .post_action = snd_pcm_post_suspend
1067 };
1068
1069 /**
1070  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1071  * @substream: the PCM substream
1072  *
1073  * After this call, all streams are changed to SUSPENDED state.
1074  */
1075 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1076 {
1077         int err;
1078         unsigned long flags;
1079
1080         if (! substream)
1081                 return 0;
1082
1083         snd_pcm_stream_lock_irqsave(substream, flags);
1084         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1085         snd_pcm_stream_unlock_irqrestore(substream, flags);
1086         return err;
1087 }
1088
1089 EXPORT_SYMBOL(snd_pcm_suspend);
1090
1091 /**
1092  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1093  * @pcm: the PCM instance
1094  *
1095  * After this call, all streams are changed to SUSPENDED state.
1096  */
1097 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1098 {
1099         struct snd_pcm_substream *substream;
1100         int stream, err = 0;
1101
1102         if (! pcm)
1103                 return 0;
1104
1105         for (stream = 0; stream < 2; stream++) {
1106                 for (substream = pcm->streams[stream].substream;
1107                      substream; substream = substream->next) {
1108                         /* FIXME: the open/close code should lock this as well */
1109                         if (substream->runtime == NULL)
1110                                 continue;
1111                         err = snd_pcm_suspend(substream);
1112                         if (err < 0 && err != -EBUSY)
1113                                 return err;
1114                 }
1115         }
1116         return 0;
1117 }
1118
1119 EXPORT_SYMBOL(snd_pcm_suspend_all);
1120
1121 /* resume */
1122
1123 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1124 {
1125         struct snd_pcm_runtime *runtime = substream->runtime;
1126         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1127                 return -ENOSYS;
1128         runtime->trigger_master = substream;
1129         return 0;
1130 }
1131
1132 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1133 {
1134         struct snd_pcm_runtime *runtime = substream->runtime;
1135         if (runtime->trigger_master != substream)
1136                 return 0;
1137         /* DMA not running previously? */
1138         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1139             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1140              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1141                 return 0;
1142         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1143 }
1144
1145 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1146 {
1147         if (substream->runtime->trigger_master == substream &&
1148             snd_pcm_running(substream))
1149                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1150 }
1151
1152 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1153 {
1154         struct snd_pcm_runtime *runtime = substream->runtime;
1155         snd_pcm_trigger_tstamp(substream);
1156         if (substream->timer)
1157                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1158                                  &runtime->trigger_tstamp);
1159         runtime->status->state = runtime->status->suspended_state;
1160 }
1161
1162 static struct action_ops snd_pcm_action_resume = {
1163         .pre_action = snd_pcm_pre_resume,
1164         .do_action = snd_pcm_do_resume,
1165         .undo_action = snd_pcm_undo_resume,
1166         .post_action = snd_pcm_post_resume
1167 };
1168
1169 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1170 {
1171         struct snd_card *card = substream->pcm->card;
1172         int res;
1173
1174         snd_power_lock(card);
1175         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1176                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1177         snd_power_unlock(card);
1178         return res;
1179 }
1180
1181 #else
1182
1183 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1184 {
1185         return -ENOSYS;
1186 }
1187
1188 #endif /* CONFIG_PM */
1189
1190 /*
1191  * xrun ioctl
1192  *
1193  * Change the RUNNING stream(s) to XRUN state.
1194  */
1195 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1196 {
1197         struct snd_card *card = substream->pcm->card;
1198         struct snd_pcm_runtime *runtime = substream->runtime;
1199         int result;
1200
1201         snd_power_lock(card);
1202         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1203                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1204                 if (result < 0)
1205                         goto _unlock;
1206         }
1207
1208         snd_pcm_stream_lock_irq(substream);
1209         switch (runtime->status->state) {
1210         case SNDRV_PCM_STATE_XRUN:
1211                 result = 0;     /* already there */
1212                 break;
1213         case SNDRV_PCM_STATE_RUNNING:
1214                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1215                 break;
1216         default:
1217                 result = -EBADFD;
1218         }
1219         snd_pcm_stream_unlock_irq(substream);
1220  _unlock:
1221         snd_power_unlock(card);
1222         return result;
1223 }
1224
1225 /*
1226  * reset ioctl
1227  */
1228 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1229 {
1230         struct snd_pcm_runtime *runtime = substream->runtime;
1231         switch (runtime->status->state) {
1232         case SNDRV_PCM_STATE_RUNNING:
1233         case SNDRV_PCM_STATE_PREPARED:
1234         case SNDRV_PCM_STATE_PAUSED:
1235         case SNDRV_PCM_STATE_SUSPENDED:
1236                 return 0;
1237         default:
1238                 return -EBADFD;
1239         }
1240 }
1241
1242 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1243 {
1244         struct snd_pcm_runtime *runtime = substream->runtime;
1245         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1246         if (err < 0)
1247                 return err;
1248         runtime->hw_ptr_base = 0;
1249         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1250                 runtime->status->hw_ptr % runtime->period_size;
1251         runtime->silence_start = runtime->status->hw_ptr;
1252         runtime->silence_filled = 0;
1253         return 0;
1254 }
1255
1256 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1257 {
1258         struct snd_pcm_runtime *runtime = substream->runtime;
1259         runtime->control->appl_ptr = runtime->status->hw_ptr;
1260         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1261             runtime->silence_size > 0)
1262                 snd_pcm_playback_silence(substream, ULONG_MAX);
1263 }
1264
1265 static struct action_ops snd_pcm_action_reset = {
1266         .pre_action = snd_pcm_pre_reset,
1267         .do_action = snd_pcm_do_reset,
1268         .post_action = snd_pcm_post_reset
1269 };
1270
1271 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1272 {
1273         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1274 }
1275
1276 /*
1277  * prepare ioctl
1278  */
1279 /* we use the second argument for updating f_flags */
1280 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1281                                int f_flags)
1282 {
1283         struct snd_pcm_runtime *runtime = substream->runtime;
1284         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1285             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1286                 return -EBADFD;
1287         if (snd_pcm_running(substream))
1288                 return -EBUSY;
1289         substream->f_flags = f_flags;
1290         return 0;
1291 }
1292
1293 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1294 {
1295         int err;
1296         err = substream->ops->prepare(substream);
1297         if (err < 0)
1298                 return err;
1299         return snd_pcm_do_reset(substream, 0);
1300 }
1301
1302 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1303 {
1304         struct snd_pcm_runtime *runtime = substream->runtime;
1305         runtime->control->appl_ptr = runtime->status->hw_ptr;
1306         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1307 }
1308
1309 static struct action_ops snd_pcm_action_prepare = {
1310         .pre_action = snd_pcm_pre_prepare,
1311         .do_action = snd_pcm_do_prepare,
1312         .post_action = snd_pcm_post_prepare
1313 };
1314
1315 /**
1316  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1317  * @substream: the PCM substream instance
1318  * @file: file to refer f_flags
1319  */
1320 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1321                            struct file *file)
1322 {
1323         int res;
1324         struct snd_card *card = substream->pcm->card;
1325         int f_flags;
1326
1327         if (file)
1328                 f_flags = file->f_flags;
1329         else
1330                 f_flags = substream->f_flags;
1331
1332         snd_power_lock(card);
1333         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1334                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1335                                                substream, f_flags);
1336         snd_power_unlock(card);
1337         return res;
1338 }
1339
1340 /*
1341  * drain ioctl
1342  */
1343
1344 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1345 {
1346         if (substream->f_flags & O_NONBLOCK)
1347                 return -EAGAIN;
1348         substream->runtime->trigger_master = substream;
1349         return 0;
1350 }
1351
1352 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1353 {
1354         struct snd_pcm_runtime *runtime = substream->runtime;
1355         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1356                 switch (runtime->status->state) {
1357                 case SNDRV_PCM_STATE_PREPARED:
1358                         /* start playback stream if possible */
1359                         if (! snd_pcm_playback_empty(substream)) {
1360                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1361                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1362                         }
1363                         break;
1364                 case SNDRV_PCM_STATE_RUNNING:
1365                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1366                         break;
1367                 default:
1368                         break;
1369                 }
1370         } else {
1371                 /* stop running stream */
1372                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1373                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1374                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1375                         snd_pcm_do_stop(substream, new_state);
1376                         snd_pcm_post_stop(substream, new_state);
1377                 }
1378         }
1379         return 0;
1380 }
1381
1382 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1383 {
1384 }
1385
1386 static struct action_ops snd_pcm_action_drain_init = {
1387         .pre_action = snd_pcm_pre_drain_init,
1388         .do_action = snd_pcm_do_drain_init,
1389         .post_action = snd_pcm_post_drain_init
1390 };
1391
1392 struct drain_rec {
1393         struct snd_pcm_substream *substream;
1394         wait_queue_t wait;
1395         snd_pcm_uframes_t stop_threshold;
1396 };
1397
1398 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1399
1400 /*
1401  * Drain the stream(s).
1402  * When the substream is linked, sync until the draining of all playback streams
1403  * is finished.
1404  * After this call, all streams are supposed to be either SETUP or DRAINING
1405  * (capture only) state.
1406  */
1407 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1408 {
1409         struct snd_card *card;
1410         struct snd_pcm_runtime *runtime;
1411         struct snd_pcm_substream *s;
1412         int result = 0;
1413         int i, num_drecs;
1414         struct drain_rec *drec, drec_tmp, *d;
1415
1416         card = substream->pcm->card;
1417         runtime = substream->runtime;
1418
1419         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1420                 return -EBADFD;
1421
1422         snd_power_lock(card);
1423         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1424                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1425                 if (result < 0) {
1426                         snd_power_unlock(card);
1427                         return result;
1428                 }
1429         }
1430
1431         /* allocate temporary record for drain sync */
1432         down_read(&snd_pcm_link_rwsem);
1433         if (snd_pcm_stream_linked(substream)) {
1434                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1435                 if (! drec) {
1436                         up_read(&snd_pcm_link_rwsem);
1437                         snd_power_unlock(card);
1438                         return -ENOMEM;
1439                 }
1440         } else
1441                 drec = &drec_tmp;
1442
1443         /* count only playback streams */
1444         num_drecs = 0;
1445         snd_pcm_group_for_each_entry(s, substream) {
1446                 runtime = s->runtime;
1447                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1448                         d = &drec[num_drecs++];
1449                         d->substream = s;
1450                         init_waitqueue_entry(&d->wait, current);
1451                         add_wait_queue(&runtime->sleep, &d->wait);
1452                         /* stop_threshold fixup to avoid endless loop when
1453                          * stop_threshold > buffer_size
1454                          */
1455                         d->stop_threshold = runtime->stop_threshold;
1456                         if (runtime->stop_threshold > runtime->buffer_size)
1457                                 runtime->stop_threshold = runtime->buffer_size;
1458                 }
1459         }
1460         up_read(&snd_pcm_link_rwsem);
1461
1462         snd_pcm_stream_lock_irq(substream);
1463         /* resume pause */
1464         if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1465                 snd_pcm_pause(substream, 0);
1466
1467         /* pre-start/stop - all running streams are changed to DRAINING state */
1468         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1469         if (result < 0) {
1470                 snd_pcm_stream_unlock_irq(substream);
1471                 goto _error;
1472         }
1473
1474         for (;;) {
1475                 long tout;
1476                 if (signal_pending(current)) {
1477                         result = -ERESTARTSYS;
1478                         break;
1479                 }
1480                 /* all finished? */
1481                 for (i = 0; i < num_drecs; i++) {
1482                         runtime = drec[i].substream->runtime;
1483                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1484                                 break;
1485                 }
1486                 if (i == num_drecs)
1487                         break; /* yes, all drained */
1488
1489                 set_current_state(TASK_INTERRUPTIBLE);
1490                 snd_pcm_stream_unlock_irq(substream);
1491                 snd_power_unlock(card);
1492                 tout = schedule_timeout(10 * HZ);
1493                 snd_power_lock(card);
1494                 snd_pcm_stream_lock_irq(substream);
1495                 if (tout == 0) {
1496                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1497                                 result = -ESTRPIPE;
1498                         else {
1499                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1500                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1501                                 result = -EIO;
1502                         }
1503                         break;
1504                 }
1505         }
1506
1507         snd_pcm_stream_unlock_irq(substream);
1508
1509  _error:
1510         for (i = 0; i < num_drecs; i++) {
1511                 d = &drec[i];
1512                 runtime = d->substream->runtime;
1513                 remove_wait_queue(&runtime->sleep, &d->wait);
1514                 runtime->stop_threshold = d->stop_threshold;
1515         }
1516
1517         if (drec != &drec_tmp)
1518                 kfree(drec);
1519         snd_power_unlock(card);
1520
1521         return result;
1522 }
1523
1524 /*
1525  * drop ioctl
1526  *
1527  * Immediately put all linked substreams into SETUP state.
1528  */
1529 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1530 {
1531         struct snd_pcm_runtime *runtime;
1532         struct snd_card *card;
1533         int result = 0;
1534
1535         if (PCM_RUNTIME_CHECK(substream))
1536                 return -ENXIO;
1537         runtime = substream->runtime;
1538         card = substream->pcm->card;
1539
1540         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1541             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1542             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1543                 return -EBADFD;
1544
1545         snd_pcm_stream_lock_irq(substream);
1546         /* resume pause */
1547         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1548                 snd_pcm_pause(substream, 0);
1549
1550         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1551         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1552         snd_pcm_stream_unlock_irq(substream);
1553
1554         return result;
1555 }
1556
1557
1558 /* WARNING: Don't forget to fput back the file */
1559 static struct file *snd_pcm_file_fd(int fd)
1560 {
1561         struct file *file;
1562         struct inode *inode;
1563         unsigned int minor;
1564
1565         file = fget(fd);
1566         if (!file)
1567                 return NULL;
1568         inode = file->f_path.dentry->d_inode;
1569         if (!S_ISCHR(inode->i_mode) ||
1570             imajor(inode) != snd_major) {
1571                 fput(file);
1572                 return NULL;
1573         }
1574         minor = iminor(inode);
1575         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1576             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1577                 fput(file);
1578                 return NULL;
1579         }
1580         return file;
1581 }
1582
1583 /*
1584  * PCM link handling
1585  */
1586 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1587 {
1588         int res = 0;
1589         struct file *file;
1590         struct snd_pcm_file *pcm_file;
1591         struct snd_pcm_substream *substream1;
1592
1593         file = snd_pcm_file_fd(fd);
1594         if (!file)
1595                 return -EBADFD;
1596         pcm_file = file->private_data;
1597         substream1 = pcm_file->substream;
1598         down_write(&snd_pcm_link_rwsem);
1599         write_lock_irq(&snd_pcm_link_rwlock);
1600         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1601             substream->runtime->status->state != substream1->runtime->status->state) {
1602                 res = -EBADFD;
1603                 goto _end;
1604         }
1605         if (snd_pcm_stream_linked(substream1)) {
1606                 res = -EALREADY;
1607                 goto _end;
1608         }
1609         if (!snd_pcm_stream_linked(substream)) {
1610                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1611                 if (substream->group == NULL) {
1612                         res = -ENOMEM;
1613                         goto _end;
1614                 }
1615                 spin_lock_init(&substream->group->lock);
1616                 INIT_LIST_HEAD(&substream->group->substreams);
1617                 list_add_tail(&substream->link_list, &substream->group->substreams);
1618                 substream->group->count = 1;
1619         }
1620         list_add_tail(&substream1->link_list, &substream->group->substreams);
1621         substream->group->count++;
1622         substream1->group = substream->group;
1623  _end:
1624         write_unlock_irq(&snd_pcm_link_rwlock);
1625         up_write(&snd_pcm_link_rwsem);
1626         fput(file);
1627         return res;
1628 }
1629
1630 static void relink_to_local(struct snd_pcm_substream *substream)
1631 {
1632         substream->group = &substream->self_group;
1633         INIT_LIST_HEAD(&substream->self_group.substreams);
1634         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1635 }
1636
1637 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1638 {
1639         struct snd_pcm_substream *s;
1640         int res = 0;
1641
1642         down_write(&snd_pcm_link_rwsem);
1643         write_lock_irq(&snd_pcm_link_rwlock);
1644         if (!snd_pcm_stream_linked(substream)) {
1645                 res = -EALREADY;
1646                 goto _end;
1647         }
1648         list_del(&substream->link_list);
1649         substream->group->count--;
1650         if (substream->group->count == 1) {     /* detach the last stream, too */
1651                 snd_pcm_group_for_each_entry(s, substream) {
1652                         relink_to_local(s);
1653                         break;
1654                 }
1655                 kfree(substream->group);
1656         }
1657         relink_to_local(substream);
1658        _end:
1659         write_unlock_irq(&snd_pcm_link_rwlock);
1660         up_write(&snd_pcm_link_rwsem);
1661         return res;
1662 }
1663
1664 /*
1665  * hw configurator
1666  */
1667 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1668                                struct snd_pcm_hw_rule *rule)
1669 {
1670         struct snd_interval t;
1671         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1672                      hw_param_interval_c(params, rule->deps[1]), &t);
1673         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1674 }
1675
1676 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1677                                struct snd_pcm_hw_rule *rule)
1678 {
1679         struct snd_interval t;
1680         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1681                      hw_param_interval_c(params, rule->deps[1]), &t);
1682         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1683 }
1684
1685 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1686                                    struct snd_pcm_hw_rule *rule)
1687 {
1688         struct snd_interval t;
1689         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1690                          hw_param_interval_c(params, rule->deps[1]),
1691                          (unsigned long) rule->private, &t);
1692         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1693 }
1694
1695 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1696                                    struct snd_pcm_hw_rule *rule)
1697 {
1698         struct snd_interval t;
1699         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1700                          (unsigned long) rule->private,
1701                          hw_param_interval_c(params, rule->deps[1]), &t);
1702         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1703 }
1704
1705 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1706                                   struct snd_pcm_hw_rule *rule)
1707 {
1708         unsigned int k;
1709         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1710         struct snd_mask m;
1711         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1712         snd_mask_any(&m);
1713         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1714                 int bits;
1715                 if (! snd_mask_test(mask, k))
1716                         continue;
1717                 bits = snd_pcm_format_physical_width(k);
1718                 if (bits <= 0)
1719                         continue; /* ignore invalid formats */
1720                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1721                         snd_mask_reset(&m, k);
1722         }
1723         return snd_mask_refine(mask, &m);
1724 }
1725
1726 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1727                                        struct snd_pcm_hw_rule *rule)
1728 {
1729         struct snd_interval t;
1730         unsigned int k;
1731         t.min = UINT_MAX;
1732         t.max = 0;
1733         t.openmin = 0;
1734         t.openmax = 0;
1735         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1736                 int bits;
1737                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1738                         continue;
1739                 bits = snd_pcm_format_physical_width(k);
1740                 if (bits <= 0)
1741                         continue; /* ignore invalid formats */
1742                 if (t.min > (unsigned)bits)
1743                         t.min = bits;
1744                 if (t.max < (unsigned)bits)
1745                         t.max = bits;
1746         }
1747         t.integer = 1;
1748         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1749 }
1750
1751 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1752 #error "Change this table"
1753 #endif
1754
1755 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1756                                  48000, 64000, 88200, 96000, 176400, 192000 };
1757
1758 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1759         .count = ARRAY_SIZE(rates),
1760         .list = rates,
1761 };
1762
1763 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1764                                 struct snd_pcm_hw_rule *rule)
1765 {
1766         struct snd_pcm_hardware *hw = rule->private;
1767         return snd_interval_list(hw_param_interval(params, rule->var),
1768                                  snd_pcm_known_rates.count,
1769                                  snd_pcm_known_rates.list, hw->rates);
1770 }
1771
1772 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1773                                             struct snd_pcm_hw_rule *rule)
1774 {
1775         struct snd_interval t;
1776         struct snd_pcm_substream *substream = rule->private;
1777         t.min = 0;
1778         t.max = substream->buffer_bytes_max;
1779         t.openmin = 0;
1780         t.openmax = 0;
1781         t.integer = 1;
1782         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1783 }
1784
1785 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1786 {
1787         struct snd_pcm_runtime *runtime = substream->runtime;
1788         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1789         int k, err;
1790
1791         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1792                 snd_mask_any(constrs_mask(constrs, k));
1793         }
1794
1795         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1796                 snd_interval_any(constrs_interval(constrs, k));
1797         }
1798
1799         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1800         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1801         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1802         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1803         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1804
1805         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1806                                    snd_pcm_hw_rule_format, NULL,
1807                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1808         if (err < 0)
1809                 return err;
1810         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1811                                   snd_pcm_hw_rule_sample_bits, NULL,
1812                                   SNDRV_PCM_HW_PARAM_FORMAT,
1813                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1814         if (err < 0)
1815                 return err;
1816         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1817                                   snd_pcm_hw_rule_div, NULL,
1818                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1819         if (err < 0)
1820                 return err;
1821         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1822                                   snd_pcm_hw_rule_mul, NULL,
1823                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1824         if (err < 0)
1825                 return err;
1826         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1827                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1828                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1829         if (err < 0)
1830                 return err;
1831         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1832                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1833                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1834         if (err < 0)
1835                 return err;
1836         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1837                                   snd_pcm_hw_rule_div, NULL,
1838                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1839         if (err < 0)
1840                 return err;
1841         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1842                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1843                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1844         if (err < 0)
1845                 return err;
1846         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1847                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1848                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1849         if (err < 0)
1850                 return err;
1851         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1852                                   snd_pcm_hw_rule_div, NULL,
1853                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1854         if (err < 0)
1855                 return err;
1856         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1857                                   snd_pcm_hw_rule_div, NULL,
1858                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1859         if (err < 0)
1860                 return err;
1861         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1862                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1863                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1864         if (err < 0)
1865                 return err;
1866         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1867                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1868                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1869         if (err < 0)
1870                 return err;
1871         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1872                                   snd_pcm_hw_rule_mul, NULL,
1873                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1874         if (err < 0)
1875                 return err;
1876         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1877                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1878                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1879         if (err < 0)
1880                 return err;
1881         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1882                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1883                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1884         if (err < 0)
1885                 return err;
1886         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1887                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1888                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1889         if (err < 0)
1890                 return err;
1891         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1892                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1893                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1894         if (err < 0)
1895                 return err;
1896         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1897                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1898                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1899         if (err < 0)
1900                 return err;
1901         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1902                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1903                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1904         if (err < 0)
1905                 return err;
1906         return 0;
1907 }
1908
1909 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1910 {
1911         struct snd_pcm_runtime *runtime = substream->runtime;
1912         struct snd_pcm_hardware *hw = &runtime->hw;
1913         int err;
1914         unsigned int mask = 0;
1915
1916         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1917                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1918         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1919                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1920         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1921                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1922                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1923                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1924                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1925                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1926                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1927         }
1928         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1929         if (err < 0)
1930                 return err;
1931
1932         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1933         if (err < 0)
1934                 return err;
1935
1936         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1937         if (err < 0)
1938                 return err;
1939
1940         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1941                                            hw->channels_min, hw->channels_max);
1942         if (err < 0)
1943                 return err;
1944
1945         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1946                                            hw->rate_min, hw->rate_max);
1947          if (err < 0)
1948                  return err;
1949
1950         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1951                                            hw->period_bytes_min, hw->period_bytes_max);
1952          if (err < 0)
1953                  return err;
1954
1955         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1956                                            hw->periods_min, hw->periods_max);
1957         if (err < 0)
1958                 return err;
1959
1960         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1961                                            hw->period_bytes_min, hw->buffer_bytes_max);
1962         if (err < 0)
1963                 return err;
1964
1965         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1966                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1967                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1968         if (err < 0)
1969                 return err;
1970
1971         /* FIXME: remove */
1972         if (runtime->dma_bytes) {
1973                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1974                 if (err < 0)
1975                         return -EINVAL;
1976         }
1977
1978         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1979                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1980                                           snd_pcm_hw_rule_rate, hw,
1981                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1982                 if (err < 0)
1983                         return err;
1984         }
1985
1986         /* FIXME: this belong to lowlevel */
1987         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1988
1989         return 0;
1990 }
1991
1992 static void pcm_release_private(struct snd_pcm_substream *substream)
1993 {
1994         snd_pcm_unlink(substream);
1995 }
1996
1997 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1998 {
1999         substream->ref_count--;
2000         if (substream->ref_count > 0)
2001                 return;
2002
2003         snd_pcm_drop(substream);
2004         if (substream->hw_opened) {
2005                 if (substream->ops->hw_free != NULL)
2006                         substream->ops->hw_free(substream);
2007                 substream->ops->close(substream);
2008                 substream->hw_opened = 0;
2009         }
2010         if (substream->pcm_release) {
2011                 substream->pcm_release(substream);
2012                 substream->pcm_release = NULL;
2013         }
2014         snd_pcm_detach_substream(substream);
2015 }
2016
2017 EXPORT_SYMBOL(snd_pcm_release_substream);
2018
2019 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2020                            struct file *file,
2021                            struct snd_pcm_substream **rsubstream)
2022 {
2023         struct snd_pcm_substream *substream;
2024         int err;
2025
2026         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2027         if (err < 0)
2028                 return err;
2029         if (substream->ref_count > 1) {
2030                 *rsubstream = substream;
2031                 return 0;
2032         }
2033
2034         err = snd_pcm_hw_constraints_init(substream);
2035         if (err < 0) {
2036                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2037                 goto error;
2038         }
2039
2040         if ((err = substream->ops->open(substream)) < 0)
2041                 goto error;
2042
2043         substream->hw_opened = 1;
2044
2045         err = snd_pcm_hw_constraints_complete(substream);
2046         if (err < 0) {
2047                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2048                 goto error;
2049         }
2050
2051         *rsubstream = substream;
2052         return 0;
2053
2054  error:
2055         snd_pcm_release_substream(substream);
2056         return err;
2057 }
2058
2059 EXPORT_SYMBOL(snd_pcm_open_substream);
2060
2061 static int snd_pcm_open_file(struct file *file,
2062                              struct snd_pcm *pcm,
2063                              int stream,
2064                              struct snd_pcm_file **rpcm_file)
2065 {
2066         struct snd_pcm_file *pcm_file;
2067         struct snd_pcm_substream *substream;
2068         struct snd_pcm_str *str;
2069         int err;
2070
2071         if (rpcm_file)
2072                 *rpcm_file = NULL;
2073
2074         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2075         if (err < 0)
2076                 return err;
2077
2078         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2079         if (pcm_file == NULL) {
2080                 snd_pcm_release_substream(substream);
2081                 return -ENOMEM;
2082         }
2083         pcm_file->substream = substream;
2084         if (substream->ref_count == 1) {
2085                 str = substream->pstr;
2086                 substream->file = pcm_file;
2087                 substream->pcm_release = pcm_release_private;
2088         }
2089         file->private_data = pcm_file;
2090         if (rpcm_file)
2091                 *rpcm_file = pcm_file;
2092         return 0;
2093 }
2094
2095 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2096 {
2097         struct snd_pcm *pcm;
2098
2099         pcm = snd_lookup_minor_data(iminor(inode),
2100                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2101         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2102 }
2103
2104 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2105 {
2106         struct snd_pcm *pcm;
2107
2108         pcm = snd_lookup_minor_data(iminor(inode),
2109                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2110         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2111 }
2112
2113 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2114 {
2115         int err;
2116         struct snd_pcm_file *pcm_file;
2117         wait_queue_t wait;
2118
2119         if (pcm == NULL) {
2120                 err = -ENODEV;
2121                 goto __error1;
2122         }
2123         err = snd_card_file_add(pcm->card, file);
2124         if (err < 0)
2125                 goto __error1;
2126         if (!try_module_get(pcm->card->module)) {
2127                 err = -EFAULT;
2128                 goto __error2;
2129         }
2130         init_waitqueue_entry(&wait, current);
2131         add_wait_queue(&pcm->open_wait, &wait);
2132         mutex_lock(&pcm->open_mutex);
2133         while (1) {
2134                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2135                 if (err >= 0)
2136                         break;
2137                 if (err == -EAGAIN) {
2138                         if (file->f_flags & O_NONBLOCK) {
2139                                 err = -EBUSY;
2140                                 break;
2141                         }
2142                 } else
2143                         break;
2144                 set_current_state(TASK_INTERRUPTIBLE);
2145                 mutex_unlock(&pcm->open_mutex);
2146                 schedule();
2147                 mutex_lock(&pcm->open_mutex);
2148                 if (signal_pending(current)) {
2149                         err = -ERESTARTSYS;
2150                         break;
2151                 }
2152         }
2153         remove_wait_queue(&pcm->open_wait, &wait);
2154         mutex_unlock(&pcm->open_mutex);
2155         if (err < 0)
2156                 goto __error;
2157         return err;
2158
2159       __error:
2160         module_put(pcm->card->module);
2161       __error2:
2162         snd_card_file_remove(pcm->card, file);
2163       __error1:
2164         return err;
2165 }
2166
2167 static int snd_pcm_release(struct inode *inode, struct file *file)
2168 {
2169         struct snd_pcm *pcm;
2170         struct snd_pcm_substream *substream;
2171         struct snd_pcm_file *pcm_file;
2172
2173         pcm_file = file->private_data;
2174         substream = pcm_file->substream;
2175         if (snd_BUG_ON(!substream))
2176                 return -ENXIO;
2177         pcm = substream->pcm;
2178         mutex_lock(&pcm->open_mutex);
2179         snd_pcm_release_substream(substream);
2180         kfree(pcm_file);
2181         mutex_unlock(&pcm->open_mutex);
2182         wake_up(&pcm->open_wait);
2183         module_put(pcm->card->module);
2184         snd_card_file_remove(pcm->card, file);
2185         return 0;
2186 }
2187
2188 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2189                                                  snd_pcm_uframes_t frames)
2190 {
2191         struct snd_pcm_runtime *runtime = substream->runtime;
2192         snd_pcm_sframes_t appl_ptr;
2193         snd_pcm_sframes_t ret;
2194         snd_pcm_sframes_t hw_avail;
2195
2196         if (frames == 0)
2197                 return 0;
2198
2199         snd_pcm_stream_lock_irq(substream);
2200         switch (runtime->status->state) {
2201         case SNDRV_PCM_STATE_PREPARED:
2202                 break;
2203         case SNDRV_PCM_STATE_DRAINING:
2204         case SNDRV_PCM_STATE_RUNNING:
2205                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2206                         break;
2207                 /* Fall through */
2208         case SNDRV_PCM_STATE_XRUN:
2209                 ret = -EPIPE;
2210                 goto __end;
2211         default:
2212                 ret = -EBADFD;
2213                 goto __end;
2214         }
2215
2216         hw_avail = snd_pcm_playback_hw_avail(runtime);
2217         if (hw_avail <= 0) {
2218                 ret = 0;
2219                 goto __end;
2220         }
2221         if (frames > (snd_pcm_uframes_t)hw_avail)
2222                 frames = hw_avail;
2223         appl_ptr = runtime->control->appl_ptr - frames;
2224         if (appl_ptr < 0)
2225                 appl_ptr += runtime->boundary;
2226         runtime->control->appl_ptr = appl_ptr;
2227         ret = frames;
2228  __end:
2229         snd_pcm_stream_unlock_irq(substream);
2230         return ret;
2231 }
2232
2233 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2234                                                 snd_pcm_uframes_t frames)
2235 {
2236         struct snd_pcm_runtime *runtime = substream->runtime;
2237         snd_pcm_sframes_t appl_ptr;
2238         snd_pcm_sframes_t ret;
2239         snd_pcm_sframes_t hw_avail;
2240
2241         if (frames == 0)
2242                 return 0;
2243
2244         snd_pcm_stream_lock_irq(substream);
2245         switch (runtime->status->state) {
2246         case SNDRV_PCM_STATE_PREPARED:
2247         case SNDRV_PCM_STATE_DRAINING:
2248                 break;
2249         case SNDRV_PCM_STATE_RUNNING:
2250                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2251                         break;
2252                 /* Fall through */
2253         case SNDRV_PCM_STATE_XRUN:
2254                 ret = -EPIPE;
2255                 goto __end;
2256         default:
2257                 ret = -EBADFD;
2258                 goto __end;
2259         }
2260
2261         hw_avail = snd_pcm_capture_hw_avail(runtime);
2262         if (hw_avail <= 0) {
2263                 ret = 0;
2264                 goto __end;
2265         }
2266         if (frames > (snd_pcm_uframes_t)hw_avail)
2267                 frames = hw_avail;
2268         appl_ptr = runtime->control->appl_ptr - frames;
2269         if (appl_ptr < 0)
2270                 appl_ptr += runtime->boundary;
2271         runtime->control->appl_ptr = appl_ptr;
2272         ret = frames;
2273  __end:
2274         snd_pcm_stream_unlock_irq(substream);
2275         return ret;
2276 }
2277
2278 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2279                                                   snd_pcm_uframes_t frames)
2280 {
2281         struct snd_pcm_runtime *runtime = substream->runtime;
2282         snd_pcm_sframes_t appl_ptr;
2283         snd_pcm_sframes_t ret;
2284         snd_pcm_sframes_t avail;
2285
2286         if (frames == 0)
2287                 return 0;
2288
2289         snd_pcm_stream_lock_irq(substream);
2290         switch (runtime->status->state) {
2291         case SNDRV_PCM_STATE_PREPARED:
2292         case SNDRV_PCM_STATE_PAUSED:
2293                 break;
2294         case SNDRV_PCM_STATE_DRAINING:
2295         case SNDRV_PCM_STATE_RUNNING:
2296                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2297                         break;
2298                 /* Fall through */
2299         case SNDRV_PCM_STATE_XRUN:
2300                 ret = -EPIPE;
2301                 goto __end;
2302         default:
2303                 ret = -EBADFD;
2304                 goto __end;
2305         }
2306
2307         avail = snd_pcm_playback_avail(runtime);
2308         if (avail <= 0) {
2309                 ret = 0;
2310                 goto __end;
2311         }
2312         if (frames > (snd_pcm_uframes_t)avail)
2313                 frames = avail;
2314         appl_ptr = runtime->control->appl_ptr + frames;
2315         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2316                 appl_ptr -= runtime->boundary;
2317         runtime->control->appl_ptr = appl_ptr;
2318         ret = frames;
2319  __end:
2320         snd_pcm_stream_unlock_irq(substream);
2321         return ret;
2322 }
2323
2324 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2325                                                  snd_pcm_uframes_t frames)
2326 {
2327         struct snd_pcm_runtime *runtime = substream->runtime;
2328         snd_pcm_sframes_t appl_ptr;
2329         snd_pcm_sframes_t ret;
2330         snd_pcm_sframes_t avail;
2331
2332         if (frames == 0)
2333                 return 0;
2334
2335         snd_pcm_stream_lock_irq(substream);
2336         switch (runtime->status->state) {
2337         case SNDRV_PCM_STATE_PREPARED:
2338         case SNDRV_PCM_STATE_DRAINING:
2339         case SNDRV_PCM_STATE_PAUSED:
2340                 break;
2341         case SNDRV_PCM_STATE_RUNNING:
2342                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343                         break;
2344                 /* Fall through */
2345         case SNDRV_PCM_STATE_XRUN:
2346                 ret = -EPIPE;
2347                 goto __end;
2348         default:
2349                 ret = -EBADFD;
2350                 goto __end;
2351         }
2352
2353         avail = snd_pcm_capture_avail(runtime);
2354         if (avail <= 0) {
2355                 ret = 0;
2356                 goto __end;
2357         }
2358         if (frames > (snd_pcm_uframes_t)avail)
2359                 frames = avail;
2360         appl_ptr = runtime->control->appl_ptr + frames;
2361         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2362                 appl_ptr -= runtime->boundary;
2363         runtime->control->appl_ptr = appl_ptr;
2364         ret = frames;
2365  __end:
2366         snd_pcm_stream_unlock_irq(substream);
2367         return ret;
2368 }
2369
2370 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2371 {
2372         struct snd_pcm_runtime *runtime = substream->runtime;
2373         int err;
2374
2375         snd_pcm_stream_lock_irq(substream);
2376         switch (runtime->status->state) {
2377         case SNDRV_PCM_STATE_DRAINING:
2378                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2379                         goto __badfd;
2380         case SNDRV_PCM_STATE_RUNNING:
2381                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2382                         break;
2383                 /* Fall through */
2384         case SNDRV_PCM_STATE_PREPARED:
2385         case SNDRV_PCM_STATE_SUSPENDED:
2386                 err = 0;
2387                 break;
2388         case SNDRV_PCM_STATE_XRUN:
2389                 err = -EPIPE;
2390                 break;
2391         default:
2392               __badfd:
2393                 err = -EBADFD;
2394                 break;
2395         }
2396         snd_pcm_stream_unlock_irq(substream);
2397         return err;
2398 }
2399
2400 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2401                          snd_pcm_sframes_t __user *res)
2402 {
2403         struct snd_pcm_runtime *runtime = substream->runtime;
2404         int err;
2405         snd_pcm_sframes_t n = 0;
2406
2407         snd_pcm_stream_lock_irq(substream);
2408         switch (runtime->status->state) {
2409         case SNDRV_PCM_STATE_DRAINING:
2410                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2411                         goto __badfd;
2412         case SNDRV_PCM_STATE_RUNNING:
2413                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2414                         break;
2415                 /* Fall through */
2416         case SNDRV_PCM_STATE_PREPARED:
2417         case SNDRV_PCM_STATE_SUSPENDED:
2418                 err = 0;
2419                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2420                         n = snd_pcm_playback_hw_avail(runtime);
2421                 else
2422                         n = snd_pcm_capture_avail(runtime);
2423                 n += runtime->delay;
2424                 break;
2425         case SNDRV_PCM_STATE_XRUN:
2426                 err = -EPIPE;
2427                 break;
2428         default:
2429               __badfd:
2430                 err = -EBADFD;
2431                 break;
2432         }
2433         snd_pcm_stream_unlock_irq(substream);
2434         if (!err)
2435                 if (put_user(n, res))
2436                         err = -EFAULT;
2437         return err;
2438 }
2439
2440 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2441                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2442 {
2443         struct snd_pcm_runtime *runtime = substream->runtime;
2444         struct snd_pcm_sync_ptr sync_ptr;
2445         volatile struct snd_pcm_mmap_status *status;
2446         volatile struct snd_pcm_mmap_control *control;
2447         int err;
2448
2449         memset(&sync_ptr, 0, sizeof(sync_ptr));
2450         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2451                 return -EFAULT;
2452         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2453                 return -EFAULT;
2454         status = runtime->status;
2455         control = runtime->control;
2456         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2457                 err = snd_pcm_hwsync(substream);
2458                 if (err < 0)
2459                         return err;
2460         }
2461         snd_pcm_stream_lock_irq(substream);
2462         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2463                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2464         else
2465                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2466         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2467                 control->avail_min = sync_ptr.c.control.avail_min;
2468         else
2469                 sync_ptr.c.control.avail_min = control->avail_min;
2470         sync_ptr.s.status.state = status->state;
2471         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2472         sync_ptr.s.status.tstamp = status->tstamp;
2473         sync_ptr.s.status.suspended_state = status->suspended_state;
2474         snd_pcm_stream_unlock_irq(substream);
2475         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2476                 return -EFAULT;
2477         return 0;
2478 }
2479
2480 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2481 {
2482         struct snd_pcm_runtime *runtime = substream->runtime;
2483         int arg;
2484
2485         if (get_user(arg, _arg))
2486                 return -EFAULT;
2487         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2488                 return -EINVAL;
2489         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2490         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2491                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2492         return 0;
2493 }
2494
2495 static int snd_pcm_common_ioctl1(struct file *file,
2496                                  struct snd_pcm_substream *substream,
2497                                  unsigned int cmd, void __user *arg)
2498 {
2499         switch (cmd) {
2500         case SNDRV_PCM_IOCTL_PVERSION:
2501                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2502         case SNDRV_PCM_IOCTL_INFO:
2503                 return snd_pcm_info_user(substream, arg);
2504         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2505                 return 0;
2506         case SNDRV_PCM_IOCTL_TTSTAMP:
2507                 return snd_pcm_tstamp(substream, arg);
2508         case SNDRV_PCM_IOCTL_HW_REFINE:
2509                 return snd_pcm_hw_refine_user(substream, arg);
2510         case SNDRV_PCM_IOCTL_HW_PARAMS:
2511                 return snd_pcm_hw_params_user(substream, arg);
2512         case SNDRV_PCM_IOCTL_HW_FREE:
2513                 return snd_pcm_hw_free(substream);
2514         case SNDRV_PCM_IOCTL_SW_PARAMS:
2515                 return snd_pcm_sw_params_user(substream, arg);
2516         case SNDRV_PCM_IOCTL_STATUS:
2517                 return snd_pcm_status_user(substream, arg);
2518         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2519                 return snd_pcm_channel_info_user(substream, arg);
2520         case SNDRV_PCM_IOCTL_PREPARE:
2521                 return snd_pcm_prepare(substream, file);
2522         case SNDRV_PCM_IOCTL_RESET:
2523                 return snd_pcm_reset(substream);
2524         case SNDRV_PCM_IOCTL_START:
2525                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2526         case SNDRV_PCM_IOCTL_LINK:
2527                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2528         case SNDRV_PCM_IOCTL_UNLINK:
2529                 return snd_pcm_unlink(substream);
2530         case SNDRV_PCM_IOCTL_RESUME:
2531                 return snd_pcm_resume(substream);
2532         case SNDRV_PCM_IOCTL_XRUN:
2533                 return snd_pcm_xrun(substream);
2534         case SNDRV_PCM_IOCTL_HWSYNC:
2535                 return snd_pcm_hwsync(substream);
2536         case SNDRV_PCM_IOCTL_DELAY:
2537                 return snd_pcm_delay(substream, arg);
2538         case SNDRV_PCM_IOCTL_SYNC_PTR:
2539                 return snd_pcm_sync_ptr(substream, arg);
2540 #ifdef CONFIG_SND_SUPPORT_OLD_API
2541         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2542                 return snd_pcm_hw_refine_old_user(substream, arg);
2543         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2544                 return snd_pcm_hw_params_old_user(substream, arg);
2545 #endif
2546         case SNDRV_PCM_IOCTL_DRAIN:
2547                 return snd_pcm_drain(substream);
2548         case SNDRV_PCM_IOCTL_DROP:
2549                 return snd_pcm_drop(substream);
2550         case SNDRV_PCM_IOCTL_PAUSE:
2551         {
2552                 int res;
2553                 snd_pcm_stream_lock_irq(substream);
2554                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2555                 snd_pcm_stream_unlock_irq(substream);
2556                 return res;
2557         }
2558         }
2559         snd_printd("unknown ioctl = 0x%x\n", cmd);
2560         return -ENOTTY;
2561 }
2562
2563 static int snd_pcm_playback_ioctl1(struct file *file,
2564                                    struct snd_pcm_substream *substream,
2565                                    unsigned int cmd, void __user *arg)
2566 {
2567         if (snd_BUG_ON(!substream))
2568                 return -ENXIO;
2569         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2570                 return -EINVAL;
2571         switch (cmd) {
2572         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2573         {
2574                 struct snd_xferi xferi;
2575                 struct snd_xferi __user *_xferi = arg;
2576                 struct snd_pcm_runtime *runtime = substream->runtime;
2577                 snd_pcm_sframes_t result;
2578                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2579                         return -EBADFD;
2580                 if (put_user(0, &_xferi->result))
2581                         return -EFAULT;
2582                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2583                         return -EFAULT;
2584                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2585                 __put_user(result, &_xferi->result);
2586                 return result < 0 ? result : 0;
2587         }
2588         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2589         {
2590                 struct snd_xfern xfern;
2591                 struct snd_xfern __user *_xfern = arg;
2592                 struct snd_pcm_runtime *runtime = substream->runtime;
2593                 void __user **bufs;
2594                 snd_pcm_sframes_t result;
2595                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2596                         return -EBADFD;
2597                 if (runtime->channels > 128)
2598                         return -EINVAL;
2599                 if (put_user(0, &_xfern->result))
2600                         return -EFAULT;
2601                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2602                         return -EFAULT;
2603
2604                 bufs = memdup_user(xfern.bufs,
2605                                    sizeof(void *) * runtime->channels);
2606                 if (IS_ERR(bufs))
2607                         return PTR_ERR(bufs);
2608                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2609                 kfree(bufs);
2610                 __put_user(result, &_xfern->result);
2611                 return result < 0 ? result : 0;
2612         }
2613         case SNDRV_PCM_IOCTL_REWIND:
2614         {
2615                 snd_pcm_uframes_t frames;
2616                 snd_pcm_uframes_t __user *_frames = arg;
2617                 snd_pcm_sframes_t result;
2618                 if (get_user(frames, _frames))
2619                         return -EFAULT;
2620                 if (put_user(0, _frames))
2621                         return -EFAULT;
2622                 result = snd_pcm_playback_rewind(substream, frames);
2623                 __put_user(result, _frames);
2624                 return result < 0 ? result : 0;
2625         }
2626         case SNDRV_PCM_IOCTL_FORWARD:
2627         {
2628                 snd_pcm_uframes_t frames;
2629                 snd_pcm_uframes_t __user *_frames = arg;
2630                 snd_pcm_sframes_t result;
2631                 if (get_user(frames, _frames))
2632                         return -EFAULT;
2633                 if (put_user(0, _frames))
2634                         return -EFAULT;
2635                 result = snd_pcm_playback_forward(substream, frames);
2636                 __put_user(result, _frames);
2637                 return result < 0 ? result : 0;
2638         }
2639         }
2640         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2641 }
2642
2643 static int snd_pcm_capture_ioctl1(struct file *file,
2644                                   struct snd_pcm_substream *substream,
2645                                   unsigned int cmd, void __user *arg)
2646 {
2647         if (snd_BUG_ON(!substream))
2648                 return -ENXIO;
2649         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2650                 return -EINVAL;
2651         switch (cmd) {
2652         case SNDRV_PCM_IOCTL_READI_FRAMES:
2653         {
2654                 struct snd_xferi xferi;
2655                 struct snd_xferi __user *_xferi = arg;
2656                 struct snd_pcm_runtime *runtime = substream->runtime;
2657                 snd_pcm_sframes_t result;
2658                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2659                         return -EBADFD;
2660                 if (put_user(0, &_xferi->result))
2661                         return -EFAULT;
2662                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2663                         return -EFAULT;
2664                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2665                 __put_user(result, &_xferi->result);
2666                 return result < 0 ? result : 0;
2667         }
2668         case SNDRV_PCM_IOCTL_READN_FRAMES:
2669         {
2670                 struct snd_xfern xfern;
2671                 struct snd_xfern __user *_xfern = arg;
2672                 struct snd_pcm_runtime *runtime = substream->runtime;
2673                 void *bufs;
2674                 snd_pcm_sframes_t result;
2675                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2676                         return -EBADFD;
2677                 if (runtime->channels > 128)
2678                         return -EINVAL;
2679                 if (put_user(0, &_xfern->result))
2680                         return -EFAULT;
2681                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2682                         return -EFAULT;
2683
2684                 bufs = memdup_user(xfern.bufs,
2685                                    sizeof(void *) * runtime->channels);
2686                 if (IS_ERR(bufs))
2687                         return PTR_ERR(bufs);
2688                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2689                 kfree(bufs);
2690                 __put_user(result, &_xfern->result);
2691                 return result < 0 ? result : 0;
2692         }
2693         case SNDRV_PCM_IOCTL_REWIND:
2694         {
2695                 snd_pcm_uframes_t frames;
2696                 snd_pcm_uframes_t __user *_frames = arg;
2697                 snd_pcm_sframes_t result;
2698                 if (get_user(frames, _frames))
2699                         return -EFAULT;
2700                 if (put_user(0, _frames))
2701                         return -EFAULT;
2702                 result = snd_pcm_capture_rewind(substream, frames);
2703                 __put_user(result, _frames);
2704                 return result < 0 ? result : 0;
2705         }
2706         case SNDRV_PCM_IOCTL_FORWARD:
2707         {
2708                 snd_pcm_uframes_t frames;
2709                 snd_pcm_uframes_t __user *_frames = arg;
2710                 snd_pcm_sframes_t result;
2711                 if (get_user(frames, _frames))
2712                         return -EFAULT;
2713                 if (put_user(0, _frames))
2714                         return -EFAULT;
2715                 result = snd_pcm_capture_forward(substream, frames);
2716                 __put_user(result, _frames);
2717                 return result < 0 ? result : 0;
2718         }
2719         }
2720         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2721 }
2722
2723 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2724                                    unsigned long arg)
2725 {
2726         struct snd_pcm_file *pcm_file;
2727
2728         pcm_file = file->private_data;
2729
2730         if (((cmd >> 8) & 0xff) != 'A')
2731                 return -ENOTTY;
2732
2733         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2734                                        (void __user *)arg);
2735 }
2736
2737 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2738                                   unsigned long arg)
2739 {
2740         struct snd_pcm_file *pcm_file;
2741
2742         pcm_file = file->private_data;
2743
2744         if (((cmd >> 8) & 0xff) != 'A')
2745                 return -ENOTTY;
2746
2747         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2748                                       (void __user *)arg);
2749 }
2750
2751 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2752                          unsigned int cmd, void *arg)
2753 {
2754         mm_segment_t fs;
2755         int result;
2756
2757         fs = snd_enter_user();
2758         switch (substream->stream) {
2759         case SNDRV_PCM_STREAM_PLAYBACK:
2760                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2761                                                  (void __user *)arg);
2762                 break;
2763         case SNDRV_PCM_STREAM_CAPTURE:
2764                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2765                                                 (void __user *)arg);
2766                 break;
2767         default:
2768                 result = -EINVAL;
2769                 break;
2770         }
2771         snd_leave_user(fs);
2772         return result;
2773 }
2774
2775 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2776
2777 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2778                             loff_t * offset)
2779 {
2780         struct snd_pcm_file *pcm_file;
2781         struct snd_pcm_substream *substream;
2782         struct snd_pcm_runtime *runtime;
2783         snd_pcm_sframes_t result;
2784
2785         pcm_file = file->private_data;
2786         substream = pcm_file->substream;
2787         if (PCM_RUNTIME_CHECK(substream))
2788                 return -ENXIO;
2789         runtime = substream->runtime;
2790         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2791                 return -EBADFD;
2792         if (!frame_aligned(runtime, count))
2793                 return -EINVAL;
2794         count = bytes_to_frames(runtime, count);
2795         result = snd_pcm_lib_read(substream, buf, count);
2796         if (result > 0)
2797                 result = frames_to_bytes(runtime, result);
2798         return result;
2799 }
2800
2801 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2802                              size_t count, loff_t * offset)
2803 {
2804         struct snd_pcm_file *pcm_file;
2805         struct snd_pcm_substream *substream;
2806         struct snd_pcm_runtime *runtime;
2807         snd_pcm_sframes_t result;
2808
2809         pcm_file = file->private_data;
2810         substream = pcm_file->substream;
2811         if (PCM_RUNTIME_CHECK(substream))
2812                 return -ENXIO;
2813         runtime = substream->runtime;
2814         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2815                 return -EBADFD;
2816         if (!frame_aligned(runtime, count))
2817                 return -EINVAL;
2818         count = bytes_to_frames(runtime, count);
2819         result = snd_pcm_lib_write(substream, buf, count);
2820         if (result > 0)
2821                 result = frames_to_bytes(runtime, result);
2822         return result;
2823 }
2824
2825 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2826                              unsigned long nr_segs, loff_t pos)
2827
2828 {
2829         struct snd_pcm_file *pcm_file;
2830         struct snd_pcm_substream *substream;
2831         struct snd_pcm_runtime *runtime;
2832         snd_pcm_sframes_t result;
2833         unsigned long i;
2834         void __user **bufs;
2835         snd_pcm_uframes_t frames;
2836
2837         pcm_file = iocb->ki_filp->private_data;
2838         substream = pcm_file->substream;
2839         if (PCM_RUNTIME_CHECK(substream))
2840                 return -ENXIO;
2841         runtime = substream->runtime;
2842         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2843                 return -EBADFD;
2844         if (nr_segs > 1024 || nr_segs != runtime->channels)
2845                 return -EINVAL;
2846         if (!frame_aligned(runtime, iov->iov_len))
2847                 return -EINVAL;
2848         frames = bytes_to_samples(runtime, iov->iov_len);
2849         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2850         if (bufs == NULL)
2851                 return -ENOMEM;
2852         for (i = 0; i < nr_segs; ++i)
2853                 bufs[i] = iov[i].iov_base;
2854         result = snd_pcm_lib_readv(substream, bufs, frames);
2855         if (result > 0)
2856                 result = frames_to_bytes(runtime, result);
2857         kfree(bufs);
2858         return result;
2859 }
2860
2861 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2862                               unsigned long nr_segs, loff_t pos)
2863 {
2864         struct snd_pcm_file *pcm_file;
2865         struct snd_pcm_substream *substream;
2866         struct snd_pcm_runtime *runtime;
2867         snd_pcm_sframes_t result;
2868         unsigned long i;
2869         void __user **bufs;
2870         snd_pcm_uframes_t frames;
2871
2872         pcm_file = iocb->ki_filp->private_data;
2873         substream = pcm_file->substream;
2874         if (PCM_RUNTIME_CHECK(substream))
2875                 return -ENXIO;
2876         runtime = substream->runtime;
2877         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2878                 return -EBADFD;
2879         if (nr_segs > 128 || nr_segs != runtime->channels ||
2880             !frame_aligned(runtime, iov->iov_len))
2881                 return -EINVAL;
2882         frames = bytes_to_samples(runtime, iov->iov_len);
2883         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2884         if (bufs == NULL)
2885                 return -ENOMEM;
2886         for (i = 0; i < nr_segs; ++i)
2887                 bufs[i] = iov[i].iov_base;
2888         result = snd_pcm_lib_writev(substream, bufs, frames);
2889         if (result > 0)
2890                 result = frames_to_bytes(runtime, result);
2891         kfree(bufs);
2892         return result;
2893 }
2894
2895 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2896 {
2897         struct snd_pcm_file *pcm_file;
2898         struct snd_pcm_substream *substream;
2899         struct snd_pcm_runtime *runtime;
2900         unsigned int mask;
2901         snd_pcm_uframes_t avail;
2902
2903         pcm_file = file->private_data;
2904
2905         substream = pcm_file->substream;
2906         if (PCM_RUNTIME_CHECK(substream))
2907                 return -ENXIO;
2908         runtime = substream->runtime;
2909
2910         poll_wait(file, &runtime->sleep, wait);
2911
2912         snd_pcm_stream_lock_irq(substream);
2913         avail = snd_pcm_playback_avail(runtime);
2914         switch (runtime->status->state) {
2915         case SNDRV_PCM_STATE_RUNNING:
2916         case SNDRV_PCM_STATE_PREPARED:
2917         case SNDRV_PCM_STATE_PAUSED:
2918                 if (avail >= runtime->control->avail_min) {
2919                         mask = POLLOUT | POLLWRNORM;
2920                         break;
2921                 }
2922                 /* Fall through */
2923         case SNDRV_PCM_STATE_DRAINING:
2924                 mask = 0;
2925                 break;
2926         default:
2927                 mask = POLLOUT | POLLWRNORM | POLLERR;
2928                 break;
2929         }
2930         snd_pcm_stream_unlock_irq(substream);
2931         return mask;
2932 }
2933
2934 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2935 {
2936         struct snd_pcm_file *pcm_file;
2937         struct snd_pcm_substream *substream;
2938         struct snd_pcm_runtime *runtime;
2939         unsigned int mask;
2940         snd_pcm_uframes_t avail;
2941
2942         pcm_file = file->private_data;
2943
2944         substream = pcm_file->substream;
2945         if (PCM_RUNTIME_CHECK(substream))
2946                 return -ENXIO;
2947         runtime = substream->runtime;
2948
2949         poll_wait(file, &runtime->sleep, wait);
2950
2951         snd_pcm_stream_lock_irq(substream);
2952         avail = snd_pcm_capture_avail(runtime);
2953         switch (runtime->status->state) {
2954         case SNDRV_PCM_STATE_RUNNING:
2955         case SNDRV_PCM_STATE_PREPARED:
2956         case SNDRV_PCM_STATE_PAUSED:
2957                 if (avail >= runtime->control->avail_min) {
2958                         mask = POLLIN | POLLRDNORM;
2959                         break;
2960                 }
2961                 mask = 0;
2962                 break;
2963         case SNDRV_PCM_STATE_DRAINING:
2964                 if (avail > 0) {
2965                         mask = POLLIN | POLLRDNORM;
2966                         break;
2967                 }
2968                 /* Fall through */
2969         default:
2970                 mask = POLLIN | POLLRDNORM | POLLERR;
2971                 break;
2972         }
2973         snd_pcm_stream_unlock_irq(substream);
2974         return mask;
2975 }
2976
2977 /*
2978  * mmap support
2979  */
2980
2981 /*
2982  * Only on coherent architectures, we can mmap the status and the control records
2983  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2984  */
2985 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2986 /*
2987  * mmap status record
2988  */
2989 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2990                                                 struct vm_fault *vmf)
2991 {
2992         struct snd_pcm_substream *substream = area->vm_private_data;
2993         struct snd_pcm_runtime *runtime;
2994
2995         if (substream == NULL)
2996                 return VM_FAULT_SIGBUS;
2997         runtime = substream->runtime;
2998         vmf->page = virt_to_page(runtime->status);
2999         get_page(vmf->page);
3000         return 0;
3001 }
3002
3003 static struct vm_operations_struct snd_pcm_vm_ops_status =
3004 {
3005         .fault =        snd_pcm_mmap_status_fault,
3006 };
3007
3008 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3009                                struct vm_area_struct *area)
3010 {
3011         struct snd_pcm_runtime *runtime;
3012         long size;
3013         if (!(area->vm_flags & VM_READ))
3014                 return -EINVAL;
3015         runtime = substream->runtime;
3016         size = area->vm_end - area->vm_start;
3017         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3018                 return -EINVAL;
3019         area->vm_ops = &snd_pcm_vm_ops_status;
3020         area->vm_private_data = substream;
3021         area->vm_flags |= VM_RESERVED;
3022         return 0;
3023 }
3024
3025 /*
3026  * mmap control record
3027  */
3028 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3029                                                 struct vm_fault *vmf)
3030 {
3031         struct snd_pcm_substream *substream = area->vm_private_data;
3032         struct snd_pcm_runtime *runtime;
3033
3034         if (substream == NULL)
3035                 return VM_FAULT_SIGBUS;
3036         runtime = substream->runtime;
3037         vmf->page = virt_to_page(runtime->control);
3038         get_page(vmf->page);
3039         return 0;
3040 }
3041
3042 static struct vm_operations_struct snd_pcm_vm_ops_control =
3043 {
3044         .fault =        snd_pcm_mmap_control_fault,
3045 };
3046
3047 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3048                                 struct vm_area_struct *area)
3049 {
3050         struct snd_pcm_runtime *runtime;
3051         long size;
3052         if (!(area->vm_flags & VM_READ))
3053                 return -EINVAL;
3054         runtime = substream->runtime;
3055         size = area->vm_end - area->vm_start;
3056         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3057                 return -EINVAL;
3058         area->vm_ops = &snd_pcm_vm_ops_control;
3059         area->vm_private_data = substream;
3060         area->vm_flags |= VM_RESERVED;
3061         return 0;
3062 }
3063 #else /* ! coherent mmap */
3064 /*
3065  * don't support mmap for status and control records.
3066  */
3067 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3068                                struct vm_area_struct *area)
3069 {
3070         return -ENXIO;
3071 }
3072 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3073                                 struct vm_area_struct *area)
3074 {
3075         return -ENXIO;
3076 }
3077 #endif /* coherent mmap */
3078
3079 /*
3080  * fault callback for mmapping a RAM page
3081  */
3082 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3083                                                 struct vm_fault *vmf)
3084 {
3085         struct snd_pcm_substream *substream = area->vm_private_data;
3086         struct snd_pcm_runtime *runtime;
3087         unsigned long offset;
3088         struct page * page;
3089         void *vaddr;
3090         size_t dma_bytes;
3091
3092         if (substream == NULL)
3093                 return VM_FAULT_SIGBUS;
3094         runtime = substream->runtime;
3095         offset = vmf->pgoff << PAGE_SHIFT;
3096         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3097         if (offset > dma_bytes - PAGE_SIZE)
3098                 return VM_FAULT_SIGBUS;
3099         if (substream->ops->page) {
3100                 page = substream->ops->page(substream, offset);
3101                 if (!page)
3102                         return VM_FAULT_SIGBUS;
3103         } else {
3104                 vaddr = runtime->dma_area + offset;
3105                 page = virt_to_page(vaddr);
3106         }
3107         get_page(page);
3108         vmf->page = page;
3109         return 0;
3110 }
3111
3112 static struct vm_operations_struct snd_pcm_vm_ops_data =
3113 {
3114         .open =         snd_pcm_mmap_data_open,
3115         .close =        snd_pcm_mmap_data_close,
3116         .fault =        snd_pcm_mmap_data_fault,
3117 };
3118
3119 /*
3120  * mmap the DMA buffer on RAM
3121  */
3122 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3123                                 struct vm_area_struct *area)
3124 {
3125         area->vm_ops = &snd_pcm_vm_ops_data;
3126         area->vm_private_data = substream;
3127         area->vm_flags |= VM_RESERVED;
3128         atomic_inc(&substream->mmap_count);
3129         return 0;
3130 }
3131
3132 /*
3133  * mmap the DMA buffer on I/O memory area
3134  */
3135 #if SNDRV_PCM_INFO_MMAP_IOMEM
3136 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3137 {
3138         .open =         snd_pcm_mmap_data_open,
3139         .close =        snd_pcm_mmap_data_close,
3140 };
3141
3142 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3143                            struct vm_area_struct *area)
3144 {
3145         long size;
3146         unsigned long offset;
3147
3148 #ifdef pgprot_noncached
3149         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3150 #endif
3151         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3152         area->vm_private_data = substream;
3153         area->vm_flags |= VM_IO;
3154         size = area->vm_end - area->vm_start;
3155         offset = area->vm_pgoff << PAGE_SHIFT;
3156         if (io_remap_pfn_range(area, area->vm_start,
3157                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3158                                 size, area->vm_page_prot))
3159                 return -EAGAIN;
3160         atomic_inc(&substream->mmap_count);
3161         return 0;
3162 }
3163
3164 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3165 #endif /* SNDRV_PCM_INFO_MMAP */
3166
3167 /*
3168  * mmap DMA buffer
3169  */
3170 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3171                       struct vm_area_struct *area)
3172 {
3173         struct snd_pcm_runtime *runtime;
3174         long size;
3175         unsigned long offset;
3176         size_t dma_bytes;
3177
3178         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3179                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3180                         return -EINVAL;
3181         } else {
3182                 if (!(area->vm_flags & VM_READ))
3183                         return -EINVAL;
3184         }
3185         runtime = substream->runtime;
3186         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3187                 return -EBADFD;
3188         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3189                 return -ENXIO;
3190         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3191             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3192                 return -EINVAL;
3193         size = area->vm_end - area->vm_start;
3194         offset = area->vm_pgoff << PAGE_SHIFT;
3195         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3196         if ((size_t)size > dma_bytes)
3197                 return -EINVAL;
3198         if (offset > dma_bytes - size)
3199                 return -EINVAL;
3200
3201         if (substream->ops->mmap)
3202                 return substream->ops->mmap(substream, area);
3203         else
3204                 return snd_pcm_default_mmap(substream, area);
3205 }
3206
3207 EXPORT_SYMBOL(snd_pcm_mmap_data);
3208
3209 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3210 {
3211         struct snd_pcm_file * pcm_file;
3212         struct snd_pcm_substream *substream;
3213         unsigned long offset;
3214
3215         pcm_file = file->private_data;
3216         substream = pcm_file->substream;
3217         if (PCM_RUNTIME_CHECK(substream))
3218                 return -ENXIO;
3219
3220         offset = area->vm_pgoff << PAGE_SHIFT;
3221         switch (offset) {
3222         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3223                 if (pcm_file->no_compat_mmap)
3224                         return -ENXIO;
3225                 return snd_pcm_mmap_status(substream, file, area);
3226         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3227                 if (pcm_file->no_compat_mmap)
3228                         return -ENXIO;
3229                 return snd_pcm_mmap_control(substream, file, area);
3230         default:
3231                 return snd_pcm_mmap_data(substream, file, area);
3232         }
3233         return 0;
3234 }
3235
3236 static int snd_pcm_fasync(int fd, struct file * file, int on)
3237 {
3238         struct snd_pcm_file * pcm_file;
3239         struct snd_pcm_substream *substream;
3240         struct snd_pcm_runtime *runtime;
3241         int err = -ENXIO;
3242
3243         lock_kernel();
3244         pcm_file = file->private_data;
3245         substream = pcm_file->substream;
3246         if (PCM_RUNTIME_CHECK(substream))
3247                 goto out;
3248         runtime = substream->runtime;
3249         err = fasync_helper(fd, file, on, &runtime->fasync);
3250 out:
3251         unlock_kernel();
3252         return err;
3253 }
3254
3255 /*
3256  * ioctl32 compat
3257  */
3258 #ifdef CONFIG_COMPAT
3259 #include "pcm_compat.c"
3260 #else
3261 #define snd_pcm_ioctl_compat    NULL
3262 #endif
3263
3264 /*
3265  *  To be removed helpers to keep binary compatibility
3266  */
3267
3268 #ifdef CONFIG_SND_SUPPORT_OLD_API
3269 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3270 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3271
3272 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3273                                                struct snd_pcm_hw_params_old *oparams)
3274 {
3275         unsigned int i;
3276
3277         memset(params, 0, sizeof(*params));
3278         params->flags = oparams->flags;
3279         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3280                 params->masks[i].bits[0] = oparams->masks[i];
3281         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3282         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3283         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3284         params->info = oparams->info;
3285         params->msbits = oparams->msbits;
3286         params->rate_num = oparams->rate_num;
3287         params->rate_den = oparams->rate_den;
3288         params->fifo_size = oparams->fifo_size;
3289 }
3290
3291 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3292                                              struct snd_pcm_hw_params *params)
3293 {
3294         unsigned int i;
3295
3296         memset(oparams, 0, sizeof(*oparams));
3297         oparams->flags = params->flags;
3298         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3299                 oparams->masks[i] = params->masks[i].bits[0];
3300         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3301         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3302         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3303         oparams->info = params->info;
3304         oparams->msbits = params->msbits;
3305         oparams->rate_num = params->rate_num;
3306         oparams->rate_den = params->rate_den;
3307         oparams->fifo_size = params->fifo_size;
3308 }
3309
3310 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3311                                       struct snd_pcm_hw_params_old __user * _oparams)
3312 {
3313         struct snd_pcm_hw_params *params;
3314         struct snd_pcm_hw_params_old *oparams = NULL;
3315         int err;
3316
3317         params = kmalloc(sizeof(*params), GFP_KERNEL);
3318         if (!params)
3319                 return -ENOMEM;
3320
3321         oparams = memdup_user(_oparams, sizeof(*oparams));
3322         if (IS_ERR(oparams)) {
3323                 err = PTR_ERR(oparams);
3324                 goto out;
3325         }
3326         snd_pcm_hw_convert_from_old_params(params, oparams);
3327         err = snd_pcm_hw_refine(substream, params);
3328         snd_pcm_hw_convert_to_old_params(oparams, params);
3329         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3330                 if (!err)
3331                         err = -EFAULT;
3332         }
3333
3334         kfree(oparams);
3335 out:
3336         kfree(params);
3337         return err;
3338 }
3339
3340 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3341                                       struct snd_pcm_hw_params_old __user * _oparams)
3342 {
3343         struct snd_pcm_hw_params *params;
3344         struct snd_pcm_hw_params_old *oparams = NULL;
3345         int err;
3346
3347         params = kmalloc(sizeof(*params), GFP_KERNEL);
3348         if (!params)
3349                 return -ENOMEM;
3350
3351         oparams = memdup_user(_oparams, sizeof(*oparams));
3352         if (IS_ERR(oparams)) {
3353                 err = PTR_ERR(oparams);
3354                 goto out;
3355         }
3356         snd_pcm_hw_convert_from_old_params(params, oparams);
3357         err = snd_pcm_hw_params(substream, params);
3358         snd_pcm_hw_convert_to_old_params(oparams, params);
3359         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3360                 if (!err)
3361                         err = -EFAULT;
3362         }
3363
3364         kfree(oparams);
3365 out:
3366         kfree(params);
3367         return err;
3368 }
3369 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3370
3371 #ifndef CONFIG_MMU
3372 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3373                                       unsigned long len, unsigned long pgoff,
3374                                       unsigned long flags)
3375 {
3376         return 0;
3377 }
3378 #else
3379 # define dummy_get_unmapped_area NULL
3380 #endif
3381
3382 /*
3383  *  Register section
3384  */
3385
3386 const struct file_operations snd_pcm_f_ops[2] = {
3387         {
3388                 .owner =                THIS_MODULE,
3389                 .write =                snd_pcm_write,
3390                 .aio_write =            snd_pcm_aio_write,
3391                 .open =                 snd_pcm_playback_open,
3392                 .release =              snd_pcm_release,
3393                 .poll =                 snd_pcm_playback_poll,
3394                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3395                 .compat_ioctl =         snd_pcm_ioctl_compat,
3396                 .mmap =                 snd_pcm_mmap,
3397                 .fasync =               snd_pcm_fasync,
3398                 .get_unmapped_area =    dummy_get_unmapped_area,
3399         },
3400         {
3401                 .owner =                THIS_MODULE,
3402                 .read =                 snd_pcm_read,
3403                 .aio_read =             snd_pcm_aio_read,
3404                 .open =                 snd_pcm_capture_open,
3405                 .release =              snd_pcm_release,
3406                 .poll =                 snd_pcm_capture_poll,
3407                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3408                 .compat_ioctl =         snd_pcm_ioctl_compat,
3409                 .mmap =                 snd_pcm_mmap,
3410                 .fasync =               snd_pcm_fasync,
3411                 .get_unmapped_area =    dummy_get_unmapped_area,
3412         }
3413 };