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 <linux/dma-mapping.h>
  30 #include <sound/core.h>
  31 #include <sound/control.h>
  32 #include <sound/info.h>
  33 #include <sound/pcm.h>
  34 #include <sound/pcm_params.h>
  35 #include <sound/timer.h>
  36 #include <sound/minors.h>
  37 #include <asm/io.h>
  38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
  39 #include <dma-coherence.h>
  40 #endif
  41
  42 /*
  43  *  Compatibility
  44  */
  45
  46 struct snd_pcm_hw_params_old {
  47         unsigned int flags;
  48         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  49                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  50         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  51                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  52         unsigned int rmask;
  53         unsigned int cmask;
  54         unsigned int info;
  55         unsigned int msbits;
  56         unsigned int rate_num;
  57         unsigned int rate_den;
  58         snd_pcm_uframes_t fifo_size;
  59         unsigned char reserved[64];
  60 };
  61
  62 #ifdef CONFIG_SND_SUPPORT_OLD_API
  63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  65
  66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  69                                       struct snd_pcm_hw_params_old __user * _oparams);
  70 #endif
  71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  72
  73 /*
  74  *
  75  */
  76
  77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  79
  80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  81
  82 static inline mm_segment_t snd_enter_user(void)
  83 {
  84         mm_segment_t fs = get_fs();
  85         set_fs(get_ds());
  86         return fs;
  87 }
  88
  89 static inline void snd_leave_user(mm_segment_t fs)
  90 {
  91         set_fs(fs);
  92 }
  93
  94
  95
  96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  97 {
  98         struct snd_pcm_runtime *runtime;
  99         struct snd_pcm *pcm = substream->pcm;
 100         struct snd_pcm_str *pstr = substream->pstr;
 101
 102         memset(info, 0, sizeof(*info));
 103         info->card = pcm->card->number;
 104         info->device = pcm->device;
 105         info->stream = substream->stream;
 106         info->subdevice = substream->number;
 107         strlcpy(info->id, pcm->id, sizeof(info->id));
 108         strlcpy(info->name, pcm->name, sizeof(info->name));
 109         info->dev_class = pcm->dev_class;
 110         info->dev_subclass = pcm->dev_subclass;
 111         info->subdevices_count = pstr->substream_count;
 112         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 113         strlcpy(info->subname, substream->name, sizeof(info->subname));
 114         runtime = substream->runtime;
 115         /* AB: FIXME!!! This is definitely nonsense */
 116         if (runtime) {
 117                 info->sync = runtime->sync;
 118                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 119         }
 120         return 0;
 121 }
 122
 123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 124                       struct snd_pcm_info __user * _info)
 125 {
 126         struct snd_pcm_info *info;
 127         int err;
 128
 129         info = kmalloc(sizeof(*info), GFP_KERNEL);
 130         if (! info)
 131                 return -ENOMEM;
 132         err = snd_pcm_info(substream, info);
 133         if (err >= 0) {
 134                 if (copy_to_user(_info, info, sizeof(*info)))
 135                         err = -EFAULT;
 136         }
 137         kfree(info);
 138         return err;
 139 }
 140
 141 #undef RULES_DEBUG
 142
 143 #ifdef RULES_DEBUG
 144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 145 static const char * const snd_pcm_hw_param_names[] = {
 146         HW_PARAM(ACCESS),
 147         HW_PARAM(FORMAT),
 148         HW_PARAM(SUBFORMAT),
 149         HW_PARAM(SAMPLE_BITS),
 150         HW_PARAM(FRAME_BITS),
 151         HW_PARAM(CHANNELS),
 152         HW_PARAM(RATE),
 153         HW_PARAM(PERIOD_TIME),
 154         HW_PARAM(PERIOD_SIZE),
 155         HW_PARAM(PERIOD_BYTES),
 156         HW_PARAM(PERIODS),
 157         HW_PARAM(BUFFER_TIME),
 158         HW_PARAM(BUFFER_SIZE),
 159         HW_PARAM(BUFFER_BYTES),
 160         HW_PARAM(TICK_TIME),
 161 };
 162 #endif
 163
 164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 165                       struct snd_pcm_hw_params *params)
 166 {
 167         unsigned int k;
 168         struct snd_pcm_hardware *hw;
 169         struct snd_interval *i = NULL;
 170         struct snd_mask *m = NULL;
 171         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 172         unsigned int rstamps[constrs->rules_num];
 173         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 174         unsigned int stamp = 2;
 175         int changed, again;
 176
 177         params->info = 0;
 178         params->fifo_size = 0;
 179         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 180                 params->msbits = 0;
 181         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 182                 params->rate_num = 0;
 183                 params->rate_den = 0;
 184         }
 185
 186         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 187                 m = hw_param_mask(params, k);
 188                 if (snd_mask_empty(m))
 189                         return -EINVAL;
 190                 if (!(params->rmask & (1 << k)))
 191                         continue;
 192 #ifdef RULES_DEBUG
 193                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 194                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 197 #ifdef RULES_DEBUG
 198                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 199 #endif
 200                 if (changed)
 201                         params->cmask |= 1 << k;
 202                 if (changed < 0)
 203                         return changed;
 204         }
 205
 206         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 207                 i = hw_param_interval(params, k);
 208                 if (snd_interval_empty(i))
 209                         return -EINVAL;
 210                 if (!(params->rmask & (1 << k)))
 211                         continue;
 212 #ifdef RULES_DEBUG
 213                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 214                 if (i->empty)
 215                         printk("empty");
 216                 else
 217                         printk("%c%u %u%c",
 218                                i->openmin ? '(' : '[', i->min,
 219                                i->max, i->openmax ? ')' : ']');
 220                 printk(" -> ");
 221 #endif
 222                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 223 #ifdef RULES_DEBUG
 224                 if (i->empty)
 225                         printk("empty\n");
 226                 else
 227                         printk("%c%u %u%c\n",
 228                                i->openmin ? '(' : '[', i->min,
 229                                i->max, i->openmax ? ')' : ']');
 230 #endif
 231                 if (changed)
 232                         params->cmask |= 1 << k;
 233                 if (changed < 0)
 234                         return changed;
 235         }
 236
 237         for (k = 0; k < constrs->rules_num; k++)
 238                 rstamps[k] = 0;
 239         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 240                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 241         do {
 242                 again = 0;
 243                 for (k = 0; k < constrs->rules_num; k++) {
 244                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 245                         unsigned int d;
 246                         int doit = 0;
 247                         if (r->cond && !(r->cond & params->flags))
 248                                 continue;
 249                         for (d = 0; r->deps[d] >= 0; d++) {
 250                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 251                                         doit = 1;
 252                                         break;
 253                                 }
 254                         }
 255                         if (!doit)
 256                                 continue;
 257 #ifdef RULES_DEBUG
 258                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 259                         if (r->var >= 0) {
 260                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 261                                 if (hw_is_mask(r->var)) {
 262                                         m = hw_param_mask(params, r->var);
 263                                         printk("%x", *m->bits);
 264                                 } else {
 265                                         i = hw_param_interval(params, r->var);
 266                                         if (i->empty)
 267                                                 printk("empty");
 268                                         else
 269                                                 printk("%c%u %u%c",
 270                                                        i->openmin ? '(' : '[', i->min,
 271                                                        i->max, i->openmax ? ')' : ']');
 272                                 }
 273                         }
 274 #endif
 275                         changed = r->func(params, r);
 276 #ifdef RULES_DEBUG
 277                         if (r->var >= 0) {
 278                                 printk(" -> ");
 279                                 if (hw_is_mask(r->var))
 280                                         printk("%x", *m->bits);
 281                                 else {
 282                                         if (i->empty)
 283                                                 printk("empty");
 284                                         else
 285                                                 printk("%c%u %u%c",
 286                                                        i->openmin ? '(' : '[', i->min,
 287                                                        i->max, i->openmax ? ')' : ']');
 288                                 }
 289                         }
 290                         printk("\n");
 291 #endif
 292                         rstamps[k] = stamp;
 293                         if (changed && r->var >= 0) {
 294                                 params->cmask |= (1 << r->var);
 295                                 vstamps[r->var] = stamp;
 296                                 again = 1;
 297                         }
 298                         if (changed < 0)
 299                                 return changed;
 300                         stamp++;
 301                 }
 302         } while (again);
 303         if (!params->msbits) {
 304                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 305                 if (snd_interval_single(i))
 306                         params->msbits = snd_interval_value(i);
 307         }
 308
 309         if (!params->rate_den) {
 310                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 311                 if (snd_interval_single(i)) {
 312                         params->rate_num = snd_interval_value(i);
 313                         params->rate_den = 1;
 314                 }
 315         }
 316
 317         hw = &substream->runtime->hw;
 318         if (!params->info)
 319                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 320         if (!params->fifo_size) {
 321                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 322                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 323                 if (snd_mask_min(m) == snd_mask_max(m) &&
 324                     snd_interval_min(i) == snd_interval_max(i)) {
 325                         changed = substream->ops->ioctl(substream,
 326                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 327                         if (changed < 0)
 328                                 return changed;
 329                 }
 330         }
 331         params->rmask = 0;
 332         return 0;
 333 }
 334
 335 EXPORT_SYMBOL(snd_pcm_hw_refine);
 336
 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 338                                   struct snd_pcm_hw_params __user * _params)
 339 {
 340         struct snd_pcm_hw_params *params;
 341         int err;
 342
 343         params = memdup_user(_params, sizeof(*params));
 344         if (IS_ERR(params))
 345                 return PTR_ERR(params);
 346
 347         err = snd_pcm_hw_refine(substream, params);
 348         if (copy_to_user(_params, params, sizeof(*params))) {
 349                 if (!err)
 350                         err = -EFAULT;
 351         }
 352
 353         kfree(params);
 354         return err;
 355 }
 356
 357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 358 {
 359         int usecs;
 360
 361         if (! runtime->rate)
 362                 return -1; /* invalid */
 363
 364         /* take 75% of period time as the deadline */
 365         usecs = (750000 / runtime->rate) * runtime->period_size;
 366         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 367                 runtime->rate;
 368
 369         return usecs;
 370 }
 371
 372 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 373                              struct snd_pcm_hw_params *params)
 374 {
 375         struct snd_pcm_runtime *runtime;
 376         int err, usecs;
 377         unsigned int bits;
 378         snd_pcm_uframes_t frames;
 379
 380         if (PCM_RUNTIME_CHECK(substream))
 381                 return -ENXIO;
 382         runtime = substream->runtime;
 383         snd_pcm_stream_lock_irq(substream);
 384         switch (runtime->status->state) {
 385         case SNDRV_PCM_STATE_OPEN:
 386         case SNDRV_PCM_STATE_SETUP:
 387         case SNDRV_PCM_STATE_PREPARED:
 388                 break;
 389         default:
 390                 snd_pcm_stream_unlock_irq(substream);
 391                 return -EBADFD;
 392         }
 393         snd_pcm_stream_unlock_irq(substream);
 394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 395         if (!substream->oss.oss)
 396 #endif
 397                 if (atomic_read(&substream->mmap_count))
 398                         return -EBADFD;
 399
 400         params->rmask = ~0U;
 401         err = snd_pcm_hw_refine(substream, params);
 402         if (err < 0)
 403                 goto _error;
 404
 405         err = snd_pcm_hw_params_choose(substream, params);
 406         if (err < 0)
 407                 goto _error;
 408
 409         if (substream->ops->hw_params != NULL) {
 410                 err = substream->ops->hw_params(substream, params);
 411                 if (err < 0)
 412                         goto _error;
 413         }
 414
 415         runtime->access = params_access(params);
 416         runtime->format = params_format(params);
 417         runtime->subformat = params_subformat(params);
 418         runtime->channels = params_channels(params);
 419         runtime->rate = params_rate(params);
 420         runtime->period_size = params_period_size(params);
 421         runtime->periods = params_periods(params);
 422         runtime->buffer_size = params_buffer_size(params);
 423         runtime->info = params->info;
 424         runtime->rate_num = params->rate_num;
 425         runtime->rate_den = params->rate_den;
 426
 427         bits = snd_pcm_format_physical_width(runtime->format);
 428         runtime->sample_bits = bits;
 429         bits *= runtime->channels;
 430         runtime->frame_bits = bits;
 431         frames = 1;
 432         while (bits % 8 != 0) {
 433                 bits *= 2;
 434                 frames *= 2;
 435         }
 436         runtime->byte_align = bits / 8;
 437         runtime->min_align = frames;
 438
 439         /* Default sw params */
 440         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 441         runtime->period_step = 1;
 442         runtime->control->avail_min = runtime->period_size;
 443         runtime->start_threshold = 1;
 444         runtime->stop_threshold = runtime->buffer_size;
 445         runtime->silence_threshold = 0;
 446         runtime->silence_size = 0;
 447         runtime->boundary = runtime->buffer_size;
 448         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 449                 runtime->boundary *= 2;
 450
 451         snd_pcm_timer_resolution_change(substream);
 452         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 453
 454         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 455                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 456         if ((usecs = period_to_usecs(runtime)) >= 0)
 457                 pm_qos_add_request(&substream->latency_pm_qos_req,
 458                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 459         return 0;
 460  _error:
 461         /* hardware might be unuseable from this time,
 462            so we force application to retry to set
 463            the correct hardware parameter settings */
 464         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 465         if (substream->ops->hw_free != NULL)
 466                 substream->ops->hw_free(substream);
 467         return err;
 468 }
 469
 470 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 471                                   struct snd_pcm_hw_params __user * _params)
 472 {
 473         struct snd_pcm_hw_params *params;
 474         int err;
 475
 476         params = memdup_user(_params, sizeof(*params));
 477         if (IS_ERR(params))
 478                 return PTR_ERR(params);
 479
 480         err = snd_pcm_hw_params(substream, params);
 481         if (copy_to_user(_params, params, sizeof(*params))) {
 482                 if (!err)
 483                         err = -EFAULT;
 484         }
 485
 486         kfree(params);
 487         return err;
 488 }
 489
 490 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 491 {
 492         struct snd_pcm_runtime *runtime;
 493         int result = 0;
 494
 495         if (PCM_RUNTIME_CHECK(substream))
 496                 return -ENXIO;
 497         runtime = substream->runtime;
 498         snd_pcm_stream_lock_irq(substream);
 499         switch (runtime->status->state) {
 500         case SNDRV_PCM_STATE_SETUP:
 501         case SNDRV_PCM_STATE_PREPARED:
 502                 break;
 503         default:
 504                 snd_pcm_stream_unlock_irq(substream);
 505                 return -EBADFD;
 506         }
 507         snd_pcm_stream_unlock_irq(substream);
 508         if (atomic_read(&substream->mmap_count))
 509                 return -EBADFD;
 510         if (substream->ops->hw_free)
 511                 result = substream->ops->hw_free(substream);
 512         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 513         pm_qos_remove_request(&substream->latency_pm_qos_req);
 514         return result;
 515 }
 516
 517 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 518                              struct snd_pcm_sw_params *params)
 519 {
 520         struct snd_pcm_runtime *runtime;
 521         int err;
 522
 523         if (PCM_RUNTIME_CHECK(substream))
 524                 return -ENXIO;
 525         runtime = substream->runtime;
 526         snd_pcm_stream_lock_irq(substream);
 527         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 528                 snd_pcm_stream_unlock_irq(substream);
 529                 return -EBADFD;
 530         }
 531         snd_pcm_stream_unlock_irq(substream);
 532
 533         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 534                 return -EINVAL;
 535         if (params->avail_min == 0)
 536                 return -EINVAL;
 537         if (params->silence_size >= runtime->boundary) {
 538                 if (params->silence_threshold != 0)
 539                         return -EINVAL;
 540         } else {
 541                 if (params->silence_size > params->silence_threshold)
 542                         return -EINVAL;
 543                 if (params->silence_threshold > runtime->buffer_size)
 544                         return -EINVAL;
 545         }
 546         err = 0;
 547         snd_pcm_stream_lock_irq(substream);
 548         runtime->tstamp_mode = params->tstamp_mode;
 549         runtime->period_step = params->period_step;
 550         runtime->control->avail_min = params->avail_min;
 551         runtime->start_threshold = params->start_threshold;
 552         runtime->stop_threshold = params->stop_threshold;
 553         runtime->silence_threshold = params->silence_threshold;
 554         runtime->silence_size = params->silence_size;
 555         params->boundary = runtime->boundary;
 556         if (snd_pcm_running(substream)) {
 557                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 558                     runtime->silence_size > 0)
 559                         snd_pcm_playback_silence(substream, ULONG_MAX);
 560                 err = snd_pcm_update_state(substream, runtime);
 561         }
 562         snd_pcm_stream_unlock_irq(substream);
 563         return err;
 564 }
 565
 566 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 567                                   struct snd_pcm_sw_params __user * _params)
 568 {
 569         struct snd_pcm_sw_params params;
 570         int err;
 571         if (copy_from_user(&params, _params, sizeof(params)))
 572                 return -EFAULT;
 573         err = snd_pcm_sw_params(substream, &params);
 574         if (copy_to_user(_params, &params, sizeof(params)))
 575                 return -EFAULT;
 576         return err;
 577 }
 578
 579 int snd_pcm_status(struct snd_pcm_substream *substream,
 580                    struct snd_pcm_status *status)
 581 {
 582         struct snd_pcm_runtime *runtime = substream->runtime;
 583
 584         snd_pcm_stream_lock_irq(substream);
 585         status->state = runtime->status->state;
 586         status->suspended_state = runtime->status->suspended_state;
 587         if (status->state == SNDRV_PCM_STATE_OPEN)
 588                 goto _end;
 589         status->trigger_tstamp = runtime->trigger_tstamp;
 590         if (snd_pcm_running(substream)) {
 591                 snd_pcm_update_hw_ptr(substream);
 592                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 593                         status->tstamp = runtime->status->tstamp;
 594                         goto _tstamp_end;
 595                 }
 596         }
 597         snd_pcm_gettime(runtime, &status->tstamp);
 598  _tstamp_end:
 599         status->appl_ptr = runtime->control->appl_ptr;
 600         status->hw_ptr = runtime->status->hw_ptr;
 601         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 602                 status->avail = snd_pcm_playback_avail(runtime);
 603                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 604                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 605                         status->delay = runtime->buffer_size - status->avail;
 606                         status->delay += runtime->delay;
 607                 } else
 608                         status->delay = 0;
 609         } else {
 610                 status->avail = snd_pcm_capture_avail(runtime);
 611                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 612                         status->delay = status->avail + runtime->delay;
 613                 else
 614                         status->delay = 0;
 615         }
 616         status->avail_max = runtime->avail_max;
 617         status->overrange = runtime->overrange;
 618         runtime->avail_max = 0;
 619         runtime->overrange = 0;
 620  _end:
 621         snd_pcm_stream_unlock_irq(substream);
 622         return 0;
 623 }
 624
 625 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 626                                struct snd_pcm_status __user * _status)
 627 {
 628         struct snd_pcm_status status;
 629         int res;
 630
 631         memset(&status, 0, sizeof(status));
 632         res = snd_pcm_status(substream, &status);
 633         if (res < 0)
 634                 return res;
 635         if (copy_to_user(_status, &status, sizeof(status)))
 636                 return -EFAULT;
 637         return 0;
 638 }
 639
 640 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 641                                 struct snd_pcm_channel_info * info)
 642 {
 643         struct snd_pcm_runtime *runtime;
 644         unsigned int channel;
 645
 646         channel = info->channel;
 647         runtime = substream->runtime;
 648         snd_pcm_stream_lock_irq(substream);
 649         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 650                 snd_pcm_stream_unlock_irq(substream);
 651                 return -EBADFD;
 652         }
 653         snd_pcm_stream_unlock_irq(substream);
 654         if (channel >= runtime->channels)
 655                 return -EINVAL;
 656         memset(info, 0, sizeof(*info));
 657         info->channel = channel;
 658         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 659 }
 660
 661 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 662                                      struct snd_pcm_channel_info __user * _info)
 663 {
 664         struct snd_pcm_channel_info info;
 665         int res;
 666
 667         if (copy_from_user(&info, _info, sizeof(info)))
 668                 return -EFAULT;
 669         res = snd_pcm_channel_info(substream, &info);
 670         if (res < 0)
 671                 return res;
 672         if (copy_to_user(_info, &info, sizeof(info)))
 673                 return -EFAULT;
 674         return 0;
 675 }
 676
 677 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 678 {
 679         struct snd_pcm_runtime *runtime = substream->runtime;
 680         if (runtime->trigger_master == NULL)
 681                 return;
 682         if (runtime->trigger_master == substream) {
 683                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 684         } else {
 685                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 686                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 687         }
 688         runtime->trigger_master = NULL;
 689 }
 690
 691 struct action_ops {
 692         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 693         int (*do_action)(struct snd_pcm_substream *substream, int state);
 694         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 695         void (*post_action)(struct snd_pcm_substream *substream, int state);
 696 };
 697
 698 /*
 699  *  this functions is core for handling of linked stream
 700  *  Note: the stream state might be changed also on failure
 701  *  Note2: call with calling stream lock + link lock
 702  */
 703 static int snd_pcm_action_group(struct action_ops *ops,
 704                                 struct snd_pcm_substream *substream,
 705                                 int state, int do_lock)
 706 {
 707         struct snd_pcm_substream *s = NULL;
 708         struct snd_pcm_substream *s1;
 709         int res = 0;
 710
 711         snd_pcm_group_for_each_entry(s, substream) {
 712                 if (do_lock && s != substream)
 713                         spin_lock_nested(&s->self_group.lock,
 714                                          SINGLE_DEPTH_NESTING);
 715                 res = ops->pre_action(s, state);
 716                 if (res < 0)
 717                         goto _unlock;
 718         }
 719         snd_pcm_group_for_each_entry(s, substream) {
 720                 res = ops->do_action(s, state);
 721                 if (res < 0) {
 722                         if (ops->undo_action) {
 723                                 snd_pcm_group_for_each_entry(s1, substream) {
 724                                         if (s1 == s) /* failed stream */
 725                                                 break;
 726                                         ops->undo_action(s1, state);
 727                                 }
 728                         }
 729                         s = NULL; /* unlock all */
 730                         goto _unlock;
 731                 }
 732         }
 733         snd_pcm_group_for_each_entry(s, substream) {
 734                 ops->post_action(s, state);
 735         }
 736  _unlock:
 737         if (do_lock) {
 738                 /* unlock streams */
 739                 snd_pcm_group_for_each_entry(s1, substream) {
 740                         if (s1 != substream)
 741                                 spin_unlock(&s1->self_group.lock);
 742                         if (s1 == s)    /* end */
 743                                 break;
 744                 }
 745         }
 746         return res;
 747 }
 748
 749 /*
 750  *  Note: call with stream lock
 751  */
 752 static int snd_pcm_action_single(struct action_ops *ops,
 753                                  struct snd_pcm_substream *substream,
 754                                  int state)
 755 {
 756         int res;
 757
 758         res = ops->pre_action(substream, state);
 759         if (res < 0)
 760                 return res;
 761         res = ops->do_action(substream, state);
 762         if (res == 0)
 763                 ops->post_action(substream, state);
 764         else if (ops->undo_action)
 765                 ops->undo_action(substream, state);
 766         return res;
 767 }
 768
 769 /*
 770  *  Note: call with stream lock
 771  */
 772 static int snd_pcm_action(struct action_ops *ops,
 773                           struct snd_pcm_substream *substream,
 774                           int state)
 775 {
 776         int res;
 777
 778         if (snd_pcm_stream_linked(substream)) {
 779                 if (!spin_trylock(&substream->group->lock)) {
 780                         spin_unlock(&substream->self_group.lock);
 781                         spin_lock(&substream->group->lock);
 782                         spin_lock(&substream->self_group.lock);
 783                 }
 784                 res = snd_pcm_action_group(ops, substream, state, 1);
 785                 spin_unlock(&substream->group->lock);
 786         } else {
 787                 res = snd_pcm_action_single(ops, substream, state);
 788         }
 789         return res;
 790 }
 791
 792 /*
 793  *  Note: don't use any locks before
 794  */
 795 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 796                                    struct snd_pcm_substream *substream,
 797                                    int state)
 798 {
 799         int res;
 800
 801         read_lock_irq(&snd_pcm_link_rwlock);
 802         if (snd_pcm_stream_linked(substream)) {
 803                 spin_lock(&substream->group->lock);
 804                 spin_lock(&substream->self_group.lock);
 805                 res = snd_pcm_action_group(ops, substream, state, 1);
 806                 spin_unlock(&substream->self_group.lock);
 807                 spin_unlock(&substream->group->lock);
 808         } else {
 809                 spin_lock(&substream->self_group.lock);
 810                 res = snd_pcm_action_single(ops, substream, state);
 811                 spin_unlock(&substream->self_group.lock);
 812         }
 813         read_unlock_irq(&snd_pcm_link_rwlock);
 814         return res;
 815 }
 816
 817 /*
 818  */
 819 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 820                                     struct snd_pcm_substream *substream,
 821                                     int state)
 822 {
 823         int res;
 824
 825         down_read(&snd_pcm_link_rwsem);
 826         if (snd_pcm_stream_linked(substream))
 827                 res = snd_pcm_action_group(ops, substream, state, 0);
 828         else
 829                 res = snd_pcm_action_single(ops, substream, state);
 830         up_read(&snd_pcm_link_rwsem);
 831         return res;
 832 }
 833
 834 /*
 835  * start callbacks
 836  */
 837 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 838 {
 839         struct snd_pcm_runtime *runtime = substream->runtime;
 840         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 841                 return -EBADFD;
 842         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 843             !snd_pcm_playback_data(substream))
 844                 return -EPIPE;
 845         runtime->trigger_master = substream;
 846         return 0;
 847 }
 848
 849 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 850 {
 851         if (substream->runtime->trigger_master != substream)
 852                 return 0;
 853         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 854 }
 855
 856 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 857 {
 858         if (substream->runtime->trigger_master == substream)
 859                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 860 }
 861
 862 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 863 {
 864         struct snd_pcm_runtime *runtime = substream->runtime;
 865         snd_pcm_trigger_tstamp(substream);
 866         runtime->hw_ptr_jiffies = jiffies;
 867         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
 868                                                             runtime->rate;
 869         runtime->status->state = state;
 870         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 871             runtime->silence_size > 0)
 872                 snd_pcm_playback_silence(substream, ULONG_MAX);
 873         if (substream->timer)
 874                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 875                                  &runtime->trigger_tstamp);
 876 }
 877
 878 static struct action_ops snd_pcm_action_start = {
 879         .pre_action = snd_pcm_pre_start,
 880         .do_action = snd_pcm_do_start,
 881         .undo_action = snd_pcm_undo_start,
 882         .post_action = snd_pcm_post_start
 883 };
 884
 885 /**
 886  * snd_pcm_start - start all linked streams
 887  * @substream: the PCM substream instance
 888  */
 889 int snd_pcm_start(struct snd_pcm_substream *substream)
 890 {
 891         return snd_pcm_action(&snd_pcm_action_start, substream,
 892                               SNDRV_PCM_STATE_RUNNING);
 893 }
 894
 895 /*
 896  * stop callbacks
 897  */
 898 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 899 {
 900         struct snd_pcm_runtime *runtime = substream->runtime;
 901         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 902                 return -EBADFD;
 903         runtime->trigger_master = substream;
 904         return 0;
 905 }
 906
 907 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 908 {
 909         if (substream->runtime->trigger_master == substream &&
 910             snd_pcm_running(substream))
 911                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 912         return 0; /* unconditonally stop all substreams */
 913 }
 914
 915 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 916 {
 917         struct snd_pcm_runtime *runtime = substream->runtime;
 918         if (runtime->status->state != state) {
 919                 snd_pcm_trigger_tstamp(substream);
 920                 if (substream->timer)
 921                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 922                                          &runtime->trigger_tstamp);
 923                 runtime->status->state = state;
 924         }
 925         wake_up(&runtime->sleep);
 926         wake_up(&runtime->tsleep);
 927 }
 928
 929 static struct action_ops snd_pcm_action_stop = {
 930         .pre_action = snd_pcm_pre_stop,
 931         .do_action = snd_pcm_do_stop,
 932         .post_action = snd_pcm_post_stop
 933 };
 934
 935 /**
 936  * snd_pcm_stop - try to stop all running streams in the substream group
 937  * @substream: the PCM substream instance
 938  * @state: PCM state after stopping the stream
 939  *
 940  * The state of each stream is then changed to the given state unconditionally.
 941  */
 942 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 943 {
 944         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 945 }
 946
 947 EXPORT_SYMBOL(snd_pcm_stop);
 948
 949 /**
 950  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 951  * @substream: the PCM substream
 952  *
 953  * After stopping, the state is changed to SETUP.
 954  * Unlike snd_pcm_stop(), this affects only the given stream.
 955  */
 956 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 957 {
 958         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 959                                      SNDRV_PCM_STATE_SETUP);
 960 }
 961
 962 /*
 963  * pause callbacks
 964  */
 965 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 966 {
 967         struct snd_pcm_runtime *runtime = substream->runtime;
 968         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 969                 return -ENOSYS;
 970         if (push) {
 971                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 972                         return -EBADFD;
 973         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 974                 return -EBADFD;
 975         runtime->trigger_master = substream;
 976         return 0;
 977 }
 978
 979 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 980 {
 981         if (substream->runtime->trigger_master != substream)
 982                 return 0;
 983         /* some drivers might use hw_ptr to recover from the pause -
 984            update the hw_ptr now */
 985         if (push)
 986                 snd_pcm_update_hw_ptr(substream);
 987         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
 988          * a delta between the current jiffies, this gives a large enough
 989          * delta, effectively to skip the check once.
 990          */
 991         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
 992         return substream->ops->trigger(substream,
 993                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 994                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 995 }
 996
 997 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 998 {
 999         if (substream->runtime->trigger_master == substream)
1000                 substream->ops->trigger(substream,
1001                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1002                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1003 }
1004
1005 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1006 {
1007         struct snd_pcm_runtime *runtime = substream->runtime;
1008         snd_pcm_trigger_tstamp(substream);
1009         if (push) {
1010                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1011                 if (substream->timer)
1012                         snd_timer_notify(substream->timer,
1013                                          SNDRV_TIMER_EVENT_MPAUSE,
1014                                          &runtime->trigger_tstamp);
1015                 wake_up(&runtime->sleep);
1016                 wake_up(&runtime->tsleep);
1017         } else {
1018                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1019                 if (substream->timer)
1020                         snd_timer_notify(substream->timer,
1021                                          SNDRV_TIMER_EVENT_MCONTINUE,
1022                                          &runtime->trigger_tstamp);
1023         }
1024 }
1025
1026 static struct action_ops snd_pcm_action_pause = {
1027         .pre_action = snd_pcm_pre_pause,
1028         .do_action = snd_pcm_do_pause,
1029         .undo_action = snd_pcm_undo_pause,
1030         .post_action = snd_pcm_post_pause
1031 };
1032
1033 /*
1034  * Push/release the pause for all linked streams.
1035  */
1036 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1037 {
1038         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1039 }
1040
1041 #ifdef CONFIG_PM
1042 /* suspend */
1043
1044 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1045 {
1046         struct snd_pcm_runtime *runtime = substream->runtime;
1047         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1048                 return -EBUSY;
1049         runtime->trigger_master = substream;
1050         return 0;
1051 }
1052
1053 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1054 {
1055         struct snd_pcm_runtime *runtime = substream->runtime;
1056         if (runtime->trigger_master != substream)
1057                 return 0;
1058         if (! snd_pcm_running(substream))
1059                 return 0;
1060         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1061         return 0; /* suspend unconditionally */
1062 }
1063
1064 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1065 {
1066         struct snd_pcm_runtime *runtime = substream->runtime;
1067         snd_pcm_trigger_tstamp(substream);
1068         if (substream->timer)
1069                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1070                                  &runtime->trigger_tstamp);
1071         runtime->status->suspended_state = runtime->status->state;
1072         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1073         wake_up(&runtime->sleep);
1074         wake_up(&runtime->tsleep);
1075 }
1076
1077 static struct action_ops snd_pcm_action_suspend = {
1078         .pre_action = snd_pcm_pre_suspend,
1079         .do_action = snd_pcm_do_suspend,
1080         .post_action = snd_pcm_post_suspend
1081 };
1082
1083 /**
1084  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1085  * @substream: the PCM substream
1086  *
1087  * After this call, all streams are changed to SUSPENDED state.
1088  */
1089 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1090 {
1091         int err;
1092         unsigned long flags;
1093
1094         if (! substream)
1095                 return 0;
1096
1097         snd_pcm_stream_lock_irqsave(substream, flags);
1098         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1099         snd_pcm_stream_unlock_irqrestore(substream, flags);
1100         return err;
1101 }
1102
1103 EXPORT_SYMBOL(snd_pcm_suspend);
1104
1105 /**
1106  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1107  * @pcm: the PCM instance
1108  *
1109  * After this call, all streams are changed to SUSPENDED state.
1110  */
1111 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1112 {
1113         struct snd_pcm_substream *substream;
1114         int stream, err = 0;
1115
1116         if (! pcm)
1117                 return 0;
1118
1119         for (stream = 0; stream < 2; stream++) {
1120                 for (substream = pcm->streams[stream].substream;
1121                      substream; substream = substream->next) {
1122                         /* FIXME: the open/close code should lock this as well */
1123                         if (substream->runtime == NULL)
1124                                 continue;
1125                         err = snd_pcm_suspend(substream);
1126                         if (err < 0 && err != -EBUSY)
1127                                 return err;
1128                 }
1129         }
1130         return 0;
1131 }
1132
1133 EXPORT_SYMBOL(snd_pcm_suspend_all);
1134
1135 /* resume */
1136
1137 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1138 {
1139         struct snd_pcm_runtime *runtime = substream->runtime;
1140         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1141                 return -ENOSYS;
1142         runtime->trigger_master = substream;
1143         return 0;
1144 }
1145
1146 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1147 {
1148         struct snd_pcm_runtime *runtime = substream->runtime;
1149         if (runtime->trigger_master != substream)
1150                 return 0;
1151         /* DMA not running previously? */
1152         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1153             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1154              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1155                 return 0;
1156         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1157 }
1158
1159 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1160 {
1161         if (substream->runtime->trigger_master == substream &&
1162             snd_pcm_running(substream))
1163                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1164 }
1165
1166 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1167 {
1168         struct snd_pcm_runtime *runtime = substream->runtime;
1169         snd_pcm_trigger_tstamp(substream);
1170         if (substream->timer)
1171                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1172                                  &runtime->trigger_tstamp);
1173         runtime->status->state = runtime->status->suspended_state;
1174 }
1175
1176 static struct action_ops snd_pcm_action_resume = {
1177         .pre_action = snd_pcm_pre_resume,
1178         .do_action = snd_pcm_do_resume,
1179         .undo_action = snd_pcm_undo_resume,
1180         .post_action = snd_pcm_post_resume
1181 };
1182
1183 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1184 {
1185         struct snd_card *card = substream->pcm->card;
1186         int res;
1187
1188         snd_power_lock(card);
1189         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1190                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1191         snd_power_unlock(card);
1192         return res;
1193 }
1194
1195 #else
1196
1197 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1198 {
1199         return -ENOSYS;
1200 }
1201
1202 #endif /* CONFIG_PM */
1203
1204 /*
1205  * xrun ioctl
1206  *
1207  * Change the RUNNING stream(s) to XRUN state.
1208  */
1209 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1210 {
1211         struct snd_card *card = substream->pcm->card;
1212         struct snd_pcm_runtime *runtime = substream->runtime;
1213         int result;
1214
1215         snd_power_lock(card);
1216         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1217                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1218                 if (result < 0)
1219                         goto _unlock;
1220         }
1221
1222         snd_pcm_stream_lock_irq(substream);
1223         switch (runtime->status->state) {
1224         case SNDRV_PCM_STATE_XRUN:
1225                 result = 0;     /* already there */
1226                 break;
1227         case SNDRV_PCM_STATE_RUNNING:
1228                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1229                 break;
1230         default:
1231                 result = -EBADFD;
1232         }
1233         snd_pcm_stream_unlock_irq(substream);
1234  _unlock:
1235         snd_power_unlock(card);
1236         return result;
1237 }
1238
1239 /*
1240  * reset ioctl
1241  */
1242 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1243 {
1244         struct snd_pcm_runtime *runtime = substream->runtime;
1245         switch (runtime->status->state) {
1246         case SNDRV_PCM_STATE_RUNNING:
1247         case SNDRV_PCM_STATE_PREPARED:
1248         case SNDRV_PCM_STATE_PAUSED:
1249         case SNDRV_PCM_STATE_SUSPENDED:
1250                 return 0;
1251         default:
1252                 return -EBADFD;
1253         }
1254 }
1255
1256 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1257 {
1258         struct snd_pcm_runtime *runtime = substream->runtime;
1259         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1260         if (err < 0)
1261                 return err;
1262         runtime->hw_ptr_base = 0;
1263         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1264                 runtime->status->hw_ptr % runtime->period_size;
1265         runtime->silence_start = runtime->status->hw_ptr;
1266         runtime->silence_filled = 0;
1267         return 0;
1268 }
1269
1270 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1271 {
1272         struct snd_pcm_runtime *runtime = substream->runtime;
1273         runtime->control->appl_ptr = runtime->status->hw_ptr;
1274         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1275             runtime->silence_size > 0)
1276                 snd_pcm_playback_silence(substream, ULONG_MAX);
1277 }
1278
1279 static struct action_ops snd_pcm_action_reset = {
1280         .pre_action = snd_pcm_pre_reset,
1281         .do_action = snd_pcm_do_reset,
1282         .post_action = snd_pcm_post_reset
1283 };
1284
1285 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1286 {
1287         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1288 }
1289
1290 /*
1291  * prepare ioctl
1292  */
1293 /* we use the second argument for updating f_flags */
1294 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1295                                int f_flags)
1296 {
1297         struct snd_pcm_runtime *runtime = substream->runtime;
1298         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1299             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1300                 return -EBADFD;
1301         if (snd_pcm_running(substream))
1302                 return -EBUSY;
1303         substream->f_flags = f_flags;
1304         return 0;
1305 }
1306
1307 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1308 {
1309         int err;
1310         err = substream->ops->prepare(substream);
1311         if (err < 0)
1312                 return err;
1313         return snd_pcm_do_reset(substream, 0);
1314 }
1315
1316 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1317 {
1318         struct snd_pcm_runtime *runtime = substream->runtime;
1319         runtime->control->appl_ptr = runtime->status->hw_ptr;
1320         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1321 }
1322
1323 static struct action_ops snd_pcm_action_prepare = {
1324         .pre_action = snd_pcm_pre_prepare,
1325         .do_action = snd_pcm_do_prepare,
1326         .post_action = snd_pcm_post_prepare
1327 };
1328
1329 /**
1330  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1331  * @substream: the PCM substream instance
1332  * @file: file to refer f_flags
1333  */
1334 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1335                            struct file *file)
1336 {
1337         int res;
1338         struct snd_card *card = substream->pcm->card;
1339         int f_flags;
1340
1341         if (file)
1342                 f_flags = file->f_flags;
1343         else
1344                 f_flags = substream->f_flags;
1345
1346         snd_power_lock(card);
1347         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1348                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1349                                                substream, f_flags);
1350         snd_power_unlock(card);
1351         return res;
1352 }
1353
1354 /*
1355  * drain ioctl
1356  */
1357
1358 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1359 {
1360         substream->runtime->trigger_master = substream;
1361         return 0;
1362 }
1363
1364 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1365 {
1366         struct snd_pcm_runtime *runtime = substream->runtime;
1367         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1368                 switch (runtime->status->state) {
1369                 case SNDRV_PCM_STATE_PREPARED:
1370                         /* start playback stream if possible */
1371                         if (! snd_pcm_playback_empty(substream)) {
1372                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1373                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1374                         }
1375                         break;
1376                 case SNDRV_PCM_STATE_RUNNING:
1377                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1378                         break;
1379                 default:
1380                         break;
1381                 }
1382         } else {
1383                 /* stop running stream */
1384                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1385                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1386                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1387                         snd_pcm_do_stop(substream, new_state);
1388                         snd_pcm_post_stop(substream, new_state);
1389                 }
1390         }
1391         return 0;
1392 }
1393
1394 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1395 {
1396 }
1397
1398 static struct action_ops snd_pcm_action_drain_init = {
1399         .pre_action = snd_pcm_pre_drain_init,
1400         .do_action = snd_pcm_do_drain_init,
1401         .post_action = snd_pcm_post_drain_init
1402 };
1403
1404 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1405
1406 /*
1407  * Drain the stream(s).
1408  * When the substream is linked, sync until the draining of all playback streams
1409  * is finished.
1410  * After this call, all streams are supposed to be either SETUP or DRAINING
1411  * (capture only) state.
1412  */
1413 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1414                          struct file *file)
1415 {
1416         struct snd_card *card;
1417         struct snd_pcm_runtime *runtime;
1418         struct snd_pcm_substream *s;
1419         wait_queue_t wait;
1420         int result = 0;
1421         int nonblock = 0;
1422
1423         card = substream->pcm->card;
1424         runtime = substream->runtime;
1425
1426         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1427                 return -EBADFD;
1428
1429         snd_power_lock(card);
1430         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1431                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1432                 if (result < 0) {
1433                         snd_power_unlock(card);
1434                         return result;
1435                 }
1436         }
1437
1438         if (file) {
1439                 if (file->f_flags & O_NONBLOCK)
1440                         nonblock = 1;
1441         } else if (substream->f_flags & O_NONBLOCK)
1442                 nonblock = 1;
1443
1444         down_read(&snd_pcm_link_rwsem);
1445         snd_pcm_stream_lock_irq(substream);
1446         /* resume pause */
1447         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1448                 snd_pcm_pause(substream, 0);
1449
1450         /* pre-start/stop - all running streams are changed to DRAINING state */
1451         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1452         if (result < 0)
1453                 goto unlock;
1454         /* in non-blocking, we don't wait in ioctl but let caller poll */
1455         if (nonblock) {
1456                 result = -EAGAIN;
1457                 goto unlock;
1458         }
1459
1460         for (;;) {
1461                 long tout;
1462                 struct snd_pcm_runtime *to_check;
1463                 if (signal_pending(current)) {
1464                         result = -ERESTARTSYS;
1465                         break;
1466                 }
1467                 /* find a substream to drain */
1468                 to_check = NULL;
1469                 snd_pcm_group_for_each_entry(s, substream) {
1470                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1471                                 continue;
1472                         runtime = s->runtime;
1473                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1474                                 to_check = runtime;
1475                                 break;
1476                         }
1477                 }
1478                 if (!to_check)
1479                         break; /* all drained */
1480                 init_waitqueue_entry(&wait, current);
1481                 add_wait_queue(&to_check->sleep, &wait);
1482                 set_current_state(TASK_INTERRUPTIBLE);
1483                 snd_pcm_stream_unlock_irq(substream);
1484                 up_read(&snd_pcm_link_rwsem);
1485                 snd_power_unlock(card);
1486                 tout = schedule_timeout(10 * HZ);
1487                 snd_power_lock(card);
1488                 down_read(&snd_pcm_link_rwsem);
1489                 snd_pcm_stream_lock_irq(substream);
1490                 remove_wait_queue(&to_check->sleep, &wait);
1491                 if (tout == 0) {
1492                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1493                                 result = -ESTRPIPE;
1494                         else {
1495                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1496                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1497                                 result = -EIO;
1498                         }
1499                         break;
1500                 }
1501         }
1502
1503  unlock:
1504         snd_pcm_stream_unlock_irq(substream);
1505         up_read(&snd_pcm_link_rwsem);
1506         snd_power_unlock(card);
1507
1508         return result;
1509 }
1510
1511 /*
1512  * drop ioctl
1513  *
1514  * Immediately put all linked substreams into SETUP state.
1515  */
1516 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1517 {
1518         struct snd_pcm_runtime *runtime;
1519         struct snd_card *card;
1520         int result = 0;
1521
1522         if (PCM_RUNTIME_CHECK(substream))
1523                 return -ENXIO;
1524         runtime = substream->runtime;
1525         card = substream->pcm->card;
1526
1527         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1528             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1529             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1530                 return -EBADFD;
1531
1532         snd_pcm_stream_lock_irq(substream);
1533         /* resume pause */
1534         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1535                 snd_pcm_pause(substream, 0);
1536
1537         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1538         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1539         snd_pcm_stream_unlock_irq(substream);
1540
1541         return result;
1542 }
1543
1544
1545 /* WARNING: Don't forget to fput back the file */
1546 static struct file *snd_pcm_file_fd(int fd)
1547 {
1548         struct file *file;
1549         struct inode *inode;
1550         unsigned int minor;
1551
1552         file = fget(fd);
1553         if (!file)
1554                 return NULL;
1555         inode = file->f_path.dentry->d_inode;
1556         if (!S_ISCHR(inode->i_mode) ||
1557             imajor(inode) != snd_major) {
1558                 fput(file);
1559                 return NULL;
1560         }
1561         minor = iminor(inode);
1562         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1563             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1564                 fput(file);
1565                 return NULL;
1566         }
1567         return file;
1568 }
1569
1570 /*
1571  * PCM link handling
1572  */
1573 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1574 {
1575         int res = 0;
1576         struct file *file;
1577         struct snd_pcm_file *pcm_file;
1578         struct snd_pcm_substream *substream1;
1579
1580         file = snd_pcm_file_fd(fd);
1581         if (!file)
1582                 return -EBADFD;
1583         pcm_file = file->private_data;
1584         substream1 = pcm_file->substream;
1585         down_write(&snd_pcm_link_rwsem);
1586         write_lock_irq(&snd_pcm_link_rwlock);
1587         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1588             substream->runtime->status->state != substream1->runtime->status->state) {
1589                 res = -EBADFD;
1590                 goto _end;
1591         }
1592         if (snd_pcm_stream_linked(substream1)) {
1593                 res = -EALREADY;
1594                 goto _end;
1595         }
1596         if (!snd_pcm_stream_linked(substream)) {
1597                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1598                 if (substream->group == NULL) {
1599                         res = -ENOMEM;
1600                         goto _end;
1601                 }
1602                 spin_lock_init(&substream->group->lock);
1603                 INIT_LIST_HEAD(&substream->group->substreams);
1604                 list_add_tail(&substream->link_list, &substream->group->substreams);
1605                 substream->group->count = 1;
1606         }
1607         list_add_tail(&substream1->link_list, &substream->group->substreams);
1608         substream->group->count++;
1609         substream1->group = substream->group;
1610  _end:
1611         write_unlock_irq(&snd_pcm_link_rwlock);
1612         up_write(&snd_pcm_link_rwsem);
1613         fput(file);
1614         return res;
1615 }
1616
1617 static void relink_to_local(struct snd_pcm_substream *substream)
1618 {
1619         substream->group = &substream->self_group;
1620         INIT_LIST_HEAD(&substream->self_group.substreams);
1621         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1622 }
1623
1624 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1625 {
1626         struct snd_pcm_substream *s;
1627         int res = 0;
1628
1629         down_write(&snd_pcm_link_rwsem);
1630         write_lock_irq(&snd_pcm_link_rwlock);
1631         if (!snd_pcm_stream_linked(substream)) {
1632                 res = -EALREADY;
1633                 goto _end;
1634         }
1635         list_del(&substream->link_list);
1636         substream->group->count--;
1637         if (substream->group->count == 1) {     /* detach the last stream, too */
1638                 snd_pcm_group_for_each_entry(s, substream) {
1639                         relink_to_local(s);
1640                         break;
1641                 }
1642                 kfree(substream->group);
1643         }
1644         relink_to_local(substream);
1645        _end:
1646         write_unlock_irq(&snd_pcm_link_rwlock);
1647         up_write(&snd_pcm_link_rwsem);
1648         return res;
1649 }
1650
1651 /*
1652  * hw configurator
1653  */
1654 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1655                                struct snd_pcm_hw_rule *rule)
1656 {
1657         struct snd_interval t;
1658         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1659                      hw_param_interval_c(params, rule->deps[1]), &t);
1660         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1661 }
1662
1663 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1664                                struct snd_pcm_hw_rule *rule)
1665 {
1666         struct snd_interval t;
1667         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1668                      hw_param_interval_c(params, rule->deps[1]), &t);
1669         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1670 }
1671
1672 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1673                                    struct snd_pcm_hw_rule *rule)
1674 {
1675         struct snd_interval t;
1676         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1677                          hw_param_interval_c(params, rule->deps[1]),
1678                          (unsigned long) rule->private, &t);
1679         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1680 }
1681
1682 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1683                                    struct snd_pcm_hw_rule *rule)
1684 {
1685         struct snd_interval t;
1686         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1687                          (unsigned long) rule->private,
1688                          hw_param_interval_c(params, rule->deps[1]), &t);
1689         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1690 }
1691
1692 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1693                                   struct snd_pcm_hw_rule *rule)
1694 {
1695         unsigned int k;
1696         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1697         struct snd_mask m;
1698         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1699         snd_mask_any(&m);
1700         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1701                 int bits;
1702                 if (! snd_mask_test(mask, k))
1703                         continue;
1704                 bits = snd_pcm_format_physical_width(k);
1705                 if (bits <= 0)
1706                         continue; /* ignore invalid formats */
1707                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1708                         snd_mask_reset(&m, k);
1709         }
1710         return snd_mask_refine(mask, &m);
1711 }
1712
1713 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1714                                        struct snd_pcm_hw_rule *rule)
1715 {
1716         struct snd_interval t;
1717         unsigned int k;
1718         t.min = UINT_MAX;
1719         t.max = 0;
1720         t.openmin = 0;
1721         t.openmax = 0;
1722         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1723                 int bits;
1724                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1725                         continue;
1726                 bits = snd_pcm_format_physical_width(k);
1727                 if (bits <= 0)
1728                         continue; /* ignore invalid formats */
1729                 if (t.min > (unsigned)bits)
1730                         t.min = bits;
1731                 if (t.max < (unsigned)bits)
1732                         t.max = bits;
1733         }
1734         t.integer = 1;
1735         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1736 }
1737
1738 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1739 #error "Change this table"
1740 #endif
1741
1742 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1743                                  48000, 64000, 88200, 96000, 176400, 192000 };
1744
1745 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1746         .count = ARRAY_SIZE(rates),
1747         .list = rates,
1748 };
1749
1750 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1751                                 struct snd_pcm_hw_rule *rule)
1752 {
1753         struct snd_pcm_hardware *hw = rule->private;
1754         return snd_interval_list(hw_param_interval(params, rule->var),
1755                                  snd_pcm_known_rates.count,
1756                                  snd_pcm_known_rates.list, hw->rates);
1757 }
1758
1759 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1760                                             struct snd_pcm_hw_rule *rule)
1761 {
1762         struct snd_interval t;
1763         struct snd_pcm_substream *substream = rule->private;
1764         t.min = 0;
1765         t.max = substream->buffer_bytes_max;
1766         t.openmin = 0;
1767         t.openmax = 0;
1768         t.integer = 1;
1769         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1770 }
1771
1772 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1773 {
1774         struct snd_pcm_runtime *runtime = substream->runtime;
1775         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1776         int k, err;
1777
1778         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1779                 snd_mask_any(constrs_mask(constrs, k));
1780         }
1781
1782         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1783                 snd_interval_any(constrs_interval(constrs, k));
1784         }
1785
1786         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1787         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1788         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1789         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1790         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1791
1792         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1793                                    snd_pcm_hw_rule_format, NULL,
1794                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1795         if (err < 0)
1796                 return err;
1797         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1798                                   snd_pcm_hw_rule_sample_bits, NULL,
1799                                   SNDRV_PCM_HW_PARAM_FORMAT,
1800                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1801         if (err < 0)
1802                 return err;
1803         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1804                                   snd_pcm_hw_rule_div, NULL,
1805                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1806         if (err < 0)
1807                 return err;
1808         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1809                                   snd_pcm_hw_rule_mul, NULL,
1810                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1811         if (err < 0)
1812                 return err;
1813         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1814                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1815                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1816         if (err < 0)
1817                 return err;
1818         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1819                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1820                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1821         if (err < 0)
1822                 return err;
1823         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1824                                   snd_pcm_hw_rule_div, NULL,
1825                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1826         if (err < 0)
1827                 return err;
1828         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1829                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1830                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1831         if (err < 0)
1832                 return err;
1833         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1834                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1835                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1836         if (err < 0)
1837                 return err;
1838         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1839                                   snd_pcm_hw_rule_div, NULL,
1840                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1841         if (err < 0)
1842                 return err;
1843         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1844                                   snd_pcm_hw_rule_div, NULL,
1845                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1846         if (err < 0)
1847                 return err;
1848         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1849                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1850                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1854                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1855                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1856         if (err < 0)
1857                 return err;
1858         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1859                                   snd_pcm_hw_rule_mul, NULL,
1860                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1861         if (err < 0)
1862                 return err;
1863         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1864                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1866         if (err < 0)
1867                 return err;
1868         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1869                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1870                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1871         if (err < 0)
1872                 return err;
1873         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1874                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1875                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1876         if (err < 0)
1877                 return err;
1878         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1879                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1880                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1881         if (err < 0)
1882                 return err;
1883         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1884                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1885                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1886         if (err < 0)
1887                 return err;
1888         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1889                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1890                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1891         if (err < 0)
1892                 return err;
1893         return 0;
1894 }
1895
1896 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1897 {
1898         struct snd_pcm_runtime *runtime = substream->runtime;
1899         struct snd_pcm_hardware *hw = &runtime->hw;
1900         int err;
1901         unsigned int mask = 0;
1902
1903         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1904                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1905         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1906                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1907         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1908                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1909                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1910                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1911                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1912                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1913                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1914         }
1915         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1916         if (err < 0)
1917                 return err;
1918
1919         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1920         if (err < 0)
1921                 return err;
1922
1923         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1924         if (err < 0)
1925                 return err;
1926
1927         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1928                                            hw->channels_min, hw->channels_max);
1929         if (err < 0)
1930                 return err;
1931
1932         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1933                                            hw->rate_min, hw->rate_max);
1934         if (err < 0)
1935                 return err;
1936
1937         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1938                                            hw->period_bytes_min, hw->period_bytes_max);
1939         if (err < 0)
1940                 return err;
1941
1942         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1943                                            hw->periods_min, hw->periods_max);
1944         if (err < 0)
1945                 return err;
1946
1947         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1948                                            hw->period_bytes_min, hw->buffer_bytes_max);
1949         if (err < 0)
1950                 return err;
1951
1952         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1953                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1954                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1955         if (err < 0)
1956                 return err;
1957
1958         /* FIXME: remove */
1959         if (runtime->dma_bytes) {
1960                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1961                 if (err < 0)
1962                         return -EINVAL;
1963         }
1964
1965         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1966                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1967                                           snd_pcm_hw_rule_rate, hw,
1968                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1969                 if (err < 0)
1970                         return err;
1971         }
1972
1973         /* FIXME: this belong to lowlevel */
1974         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1975
1976         return 0;
1977 }
1978
1979 static void pcm_release_private(struct snd_pcm_substream *substream)
1980 {
1981         snd_pcm_unlink(substream);
1982 }
1983
1984 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1985 {
1986         substream->ref_count--;
1987         if (substream->ref_count > 0)
1988                 return;
1989
1990         snd_pcm_drop(substream);
1991         if (substream->hw_opened) {
1992                 if (substream->ops->hw_free != NULL)
1993                         substream->ops->hw_free(substream);
1994                 substream->ops->close(substream);
1995                 substream->hw_opened = 0;
1996         }
1997         if (pm_qos_request_active(&substream->latency_pm_qos_req))
1998                 pm_qos_remove_request(&substream->latency_pm_qos_req);
1999         if (substream->pcm_release) {
2000                 substream->pcm_release(substream);
2001                 substream->pcm_release = NULL;
2002         }
2003         snd_pcm_detach_substream(substream);
2004 }
2005
2006 EXPORT_SYMBOL(snd_pcm_release_substream);
2007
2008 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2009                            struct file *file,
2010                            struct snd_pcm_substream **rsubstream)
2011 {
2012         struct snd_pcm_substream *substream;
2013         int err;
2014
2015         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2016         if (err < 0)
2017                 return err;
2018         if (substream->ref_count > 1) {
2019                 *rsubstream = substream;
2020                 return 0;
2021         }
2022
2023         err = snd_pcm_hw_constraints_init(substream);
2024         if (err < 0) {
2025                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2026                 goto error;
2027         }
2028
2029         if ((err = substream->ops->open(substream)) < 0)
2030                 goto error;
2031
2032         substream->hw_opened = 1;
2033
2034         err = snd_pcm_hw_constraints_complete(substream);
2035         if (err < 0) {
2036                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2037                 goto error;
2038         }
2039
2040         *rsubstream = substream;
2041         return 0;
2042
2043  error:
2044         snd_pcm_release_substream(substream);
2045         return err;
2046 }
2047
2048 EXPORT_SYMBOL(snd_pcm_open_substream);
2049
2050 static int snd_pcm_open_file(struct file *file,
2051                              struct snd_pcm *pcm,
2052                              int stream,
2053                              struct snd_pcm_file **rpcm_file)
2054 {
2055         struct snd_pcm_file *pcm_file;
2056         struct snd_pcm_substream *substream;
2057         struct snd_pcm_str *str;
2058         int err;
2059
2060         if (rpcm_file)
2061                 *rpcm_file = NULL;
2062
2063         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2064         if (err < 0)
2065                 return err;
2066
2067         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2068         if (pcm_file == NULL) {
2069                 snd_pcm_release_substream(substream);
2070                 return -ENOMEM;
2071         }
2072         pcm_file->substream = substream;
2073         if (substream->ref_count == 1) {
2074                 str = substream->pstr;
2075                 substream->file = pcm_file;
2076                 substream->pcm_release = pcm_release_private;
2077         }
2078         file->private_data = pcm_file;
2079         if (rpcm_file)
2080                 *rpcm_file = pcm_file;
2081         return 0;
2082 }
2083
2084 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2085 {
2086         struct snd_pcm *pcm;
2087         int err = nonseekable_open(inode, file);
2088         if (err < 0)
2089                 return err;
2090         pcm = snd_lookup_minor_data(iminor(inode),
2091                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2092         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2093 }
2094
2095 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2096 {
2097         struct snd_pcm *pcm;
2098         int err = nonseekable_open(inode, file);
2099         if (err < 0)
2100                 return err;
2101         pcm = snd_lookup_minor_data(iminor(inode),
2102                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2103         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2104 }
2105
2106 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2107 {
2108         int err;
2109         struct snd_pcm_file *pcm_file;
2110         wait_queue_t wait;
2111
2112         if (pcm == NULL) {
2113                 err = -ENODEV;
2114                 goto __error1;
2115         }
2116         err = snd_card_file_add(pcm->card, file);
2117         if (err < 0)
2118                 goto __error1;
2119         if (!try_module_get(pcm->card->module)) {
2120                 err = -EFAULT;
2121                 goto __error2;
2122         }
2123         init_waitqueue_entry(&wait, current);
2124         add_wait_queue(&pcm->open_wait, &wait);
2125         mutex_lock(&pcm->open_mutex);
2126         while (1) {
2127                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2128                 if (err >= 0)
2129                         break;
2130                 if (err == -EAGAIN) {
2131                         if (file->f_flags & O_NONBLOCK) {
2132                                 err = -EBUSY;
2133                                 break;
2134                         }
2135                 } else
2136                         break;
2137                 set_current_state(TASK_INTERRUPTIBLE);
2138                 mutex_unlock(&pcm->open_mutex);
2139                 schedule();
2140                 mutex_lock(&pcm->open_mutex);
2141                 if (signal_pending(current)) {
2142                         err = -ERESTARTSYS;
2143                         break;
2144                 }
2145         }
2146         remove_wait_queue(&pcm->open_wait, &wait);
2147         mutex_unlock(&pcm->open_mutex);
2148         if (err < 0)
2149                 goto __error;
2150         return err;
2151
2152       __error:
2153         module_put(pcm->card->module);
2154       __error2:
2155         snd_card_file_remove(pcm->card, file);
2156       __error1:
2157         return err;
2158 }
2159
2160 static int snd_pcm_release(struct inode *inode, struct file *file)
2161 {
2162         struct snd_pcm *pcm;
2163         struct snd_pcm_substream *substream;
2164         struct snd_pcm_file *pcm_file;
2165
2166         pcm_file = file->private_data;
2167         substream = pcm_file->substream;
2168         if (snd_BUG_ON(!substream))
2169                 return -ENXIO;
2170         pcm = substream->pcm;
2171         mutex_lock(&pcm->open_mutex);
2172         snd_pcm_release_substream(substream);
2173         kfree(pcm_file);
2174         mutex_unlock(&pcm->open_mutex);
2175         wake_up(&pcm->open_wait);
2176         module_put(pcm->card->module);
2177         snd_card_file_remove(pcm->card, file);
2178         return 0;
2179 }
2180
2181 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2182                                                  snd_pcm_uframes_t frames)
2183 {
2184         struct snd_pcm_runtime *runtime = substream->runtime;
2185         snd_pcm_sframes_t appl_ptr;
2186         snd_pcm_sframes_t ret;
2187         snd_pcm_sframes_t hw_avail;
2188
2189         if (frames == 0)
2190                 return 0;
2191
2192         snd_pcm_stream_lock_irq(substream);
2193         switch (runtime->status->state) {
2194         case SNDRV_PCM_STATE_PREPARED:
2195                 break;
2196         case SNDRV_PCM_STATE_DRAINING:
2197         case SNDRV_PCM_STATE_RUNNING:
2198                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2199                         break;
2200                 /* Fall through */
2201         case SNDRV_PCM_STATE_XRUN:
2202                 ret = -EPIPE;
2203                 goto __end;
2204         case SNDRV_PCM_STATE_SUSPENDED:
2205                 ret = -ESTRPIPE;
2206                 goto __end;
2207         default:
2208                 ret = -EBADFD;
2209                 goto __end;
2210         }
2211
2212         hw_avail = snd_pcm_playback_hw_avail(runtime);
2213         if (hw_avail <= 0) {
2214                 ret = 0;
2215                 goto __end;
2216         }
2217         if (frames > (snd_pcm_uframes_t)hw_avail)
2218                 frames = hw_avail;
2219         appl_ptr = runtime->control->appl_ptr - frames;
2220         if (appl_ptr < 0)
2221                 appl_ptr += runtime->boundary;
2222         runtime->control->appl_ptr = appl_ptr;
2223         ret = frames;
2224  __end:
2225         snd_pcm_stream_unlock_irq(substream);
2226         return ret;
2227 }
2228
2229 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2230                                                 snd_pcm_uframes_t frames)
2231 {
2232         struct snd_pcm_runtime *runtime = substream->runtime;
2233         snd_pcm_sframes_t appl_ptr;
2234         snd_pcm_sframes_t ret;
2235         snd_pcm_sframes_t hw_avail;
2236
2237         if (frames == 0)
2238                 return 0;
2239
2240         snd_pcm_stream_lock_irq(substream);
2241         switch (runtime->status->state) {
2242         case SNDRV_PCM_STATE_PREPARED:
2243         case SNDRV_PCM_STATE_DRAINING:
2244                 break;
2245         case SNDRV_PCM_STATE_RUNNING:
2246                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2247                         break;
2248                 /* Fall through */
2249         case SNDRV_PCM_STATE_XRUN:
2250                 ret = -EPIPE;
2251                 goto __end;
2252         case SNDRV_PCM_STATE_SUSPENDED:
2253                 ret = -ESTRPIPE;
2254                 goto __end;
2255         default:
2256                 ret = -EBADFD;
2257                 goto __end;
2258         }
2259
2260         hw_avail = snd_pcm_capture_hw_avail(runtime);
2261         if (hw_avail <= 0) {
2262                 ret = 0;
2263                 goto __end;
2264         }
2265         if (frames > (snd_pcm_uframes_t)hw_avail)
2266                 frames = hw_avail;
2267         appl_ptr = runtime->control->appl_ptr - frames;
2268         if (appl_ptr < 0)
2269                 appl_ptr += runtime->boundary;
2270         runtime->control->appl_ptr = appl_ptr;
2271         ret = frames;
2272  __end:
2273         snd_pcm_stream_unlock_irq(substream);
2274         return ret;
2275 }
2276
2277 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2278                                                   snd_pcm_uframes_t frames)
2279 {
2280         struct snd_pcm_runtime *runtime = substream->runtime;
2281         snd_pcm_sframes_t appl_ptr;
2282         snd_pcm_sframes_t ret;
2283         snd_pcm_sframes_t avail;
2284
2285         if (frames == 0)
2286                 return 0;
2287
2288         snd_pcm_stream_lock_irq(substream);
2289         switch (runtime->status->state) {
2290         case SNDRV_PCM_STATE_PREPARED:
2291         case SNDRV_PCM_STATE_PAUSED:
2292                 break;
2293         case SNDRV_PCM_STATE_DRAINING:
2294         case SNDRV_PCM_STATE_RUNNING:
2295                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2296                         break;
2297                 /* Fall through */
2298         case SNDRV_PCM_STATE_XRUN:
2299                 ret = -EPIPE;
2300                 goto __end;
2301         case SNDRV_PCM_STATE_SUSPENDED:
2302                 ret = -ESTRPIPE;
2303                 goto __end;
2304         default:
2305                 ret = -EBADFD;
2306                 goto __end;
2307         }
2308
2309         avail = snd_pcm_playback_avail(runtime);
2310         if (avail <= 0) {
2311                 ret = 0;
2312                 goto __end;
2313         }
2314         if (frames > (snd_pcm_uframes_t)avail)
2315                 frames = avail;
2316         appl_ptr = runtime->control->appl_ptr + frames;
2317         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2318                 appl_ptr -= runtime->boundary;
2319         runtime->control->appl_ptr = appl_ptr;
2320         ret = frames;
2321  __end:
2322         snd_pcm_stream_unlock_irq(substream);
2323         return ret;
2324 }
2325
2326 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2327                                                  snd_pcm_uframes_t frames)
2328 {
2329         struct snd_pcm_runtime *runtime = substream->runtime;
2330         snd_pcm_sframes_t appl_ptr;
2331         snd_pcm_sframes_t ret;
2332         snd_pcm_sframes_t avail;
2333
2334         if (frames == 0)
2335                 return 0;
2336
2337         snd_pcm_stream_lock_irq(substream);
2338         switch (runtime->status->state) {
2339         case SNDRV_PCM_STATE_PREPARED:
2340         case SNDRV_PCM_STATE_DRAINING:
2341         case SNDRV_PCM_STATE_PAUSED:
2342                 break;
2343         case SNDRV_PCM_STATE_RUNNING:
2344                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2345                         break;
2346                 /* Fall through */
2347         case SNDRV_PCM_STATE_XRUN:
2348                 ret = -EPIPE;
2349                 goto __end;
2350         case SNDRV_PCM_STATE_SUSPENDED:
2351                 ret = -ESTRPIPE;
2352                 goto __end;
2353         default:
2354                 ret = -EBADFD;
2355                 goto __end;
2356         }
2357
2358         avail = snd_pcm_capture_avail(runtime);
2359         if (avail <= 0) {
2360                 ret = 0;
2361                 goto __end;
2362         }
2363         if (frames > (snd_pcm_uframes_t)avail)
2364                 frames = avail;
2365         appl_ptr = runtime->control->appl_ptr + frames;
2366         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2367                 appl_ptr -= runtime->boundary;
2368         runtime->control->appl_ptr = appl_ptr;
2369         ret = frames;
2370  __end:
2371         snd_pcm_stream_unlock_irq(substream);
2372         return ret;
2373 }
2374
2375 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2376 {
2377         struct snd_pcm_runtime *runtime = substream->runtime;
2378         int err;
2379
2380         snd_pcm_stream_lock_irq(substream);
2381         switch (runtime->status->state) {
2382         case SNDRV_PCM_STATE_DRAINING:
2383                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2384                         goto __badfd;
2385         case SNDRV_PCM_STATE_RUNNING:
2386                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2387                         break;
2388                 /* Fall through */
2389         case SNDRV_PCM_STATE_PREPARED:
2390         case SNDRV_PCM_STATE_SUSPENDED:
2391                 err = 0;
2392                 break;
2393         case SNDRV_PCM_STATE_XRUN:
2394                 err = -EPIPE;
2395                 break;
2396         default:
2397               __badfd:
2398                 err = -EBADFD;
2399                 break;
2400         }
2401         snd_pcm_stream_unlock_irq(substream);
2402         return err;
2403 }
2404
2405 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2406                          snd_pcm_sframes_t __user *res)
2407 {
2408         struct snd_pcm_runtime *runtime = substream->runtime;
2409         int err;
2410         snd_pcm_sframes_t n = 0;
2411
2412         snd_pcm_stream_lock_irq(substream);
2413         switch (runtime->status->state) {
2414         case SNDRV_PCM_STATE_DRAINING:
2415                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2416                         goto __badfd;
2417         case SNDRV_PCM_STATE_RUNNING:
2418                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2419                         break;
2420                 /* Fall through */
2421         case SNDRV_PCM_STATE_PREPARED:
2422         case SNDRV_PCM_STATE_SUSPENDED:
2423                 err = 0;
2424                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2425                         n = snd_pcm_playback_hw_avail(runtime);
2426                 else
2427                         n = snd_pcm_capture_avail(runtime);
2428                 n += runtime->delay;
2429                 break;
2430         case SNDRV_PCM_STATE_XRUN:
2431                 err = -EPIPE;
2432                 break;
2433         default:
2434               __badfd:
2435                 err = -EBADFD;
2436                 break;
2437         }
2438         snd_pcm_stream_unlock_irq(substream);
2439         if (!err)
2440                 if (put_user(n, res))
2441                         err = -EFAULT;
2442         return err;
2443 }
2444
2445 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2446                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2447 {
2448         struct snd_pcm_runtime *runtime = substream->runtime;
2449         struct snd_pcm_sync_ptr sync_ptr;
2450         volatile struct snd_pcm_mmap_status *status;
2451         volatile struct snd_pcm_mmap_control *control;
2452         int err;
2453
2454         memset(&sync_ptr, 0, sizeof(sync_ptr));
2455         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2456                 return -EFAULT;
2457         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2458                 return -EFAULT;
2459         status = runtime->status;
2460         control = runtime->control;
2461         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2462                 err = snd_pcm_hwsync(substream);
2463                 if (err < 0)
2464                         return err;
2465         }
2466         snd_pcm_stream_lock_irq(substream);
2467         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2468                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2469         else
2470                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2471         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2472                 control->avail_min = sync_ptr.c.control.avail_min;
2473         else
2474                 sync_ptr.c.control.avail_min = control->avail_min;
2475         sync_ptr.s.status.state = status->state;
2476         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2477         sync_ptr.s.status.tstamp = status->tstamp;
2478         sync_ptr.s.status.suspended_state = status->suspended_state;
2479         snd_pcm_stream_unlock_irq(substream);
2480         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2481                 return -EFAULT;
2482         return 0;
2483 }
2484
2485 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2486 {
2487         struct snd_pcm_runtime *runtime = substream->runtime;
2488         int arg;
2489
2490         if (get_user(arg, _arg))
2491                 return -EFAULT;
2492         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2493                 return -EINVAL;
2494         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2495         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2496                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2497         return 0;
2498 }
2499
2500 static int snd_pcm_common_ioctl1(struct file *file,
2501                                  struct snd_pcm_substream *substream,
2502                                  unsigned int cmd, void __user *arg)
2503 {
2504         switch (cmd) {
2505         case SNDRV_PCM_IOCTL_PVERSION:
2506                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2507         case SNDRV_PCM_IOCTL_INFO:
2508                 return snd_pcm_info_user(substream, arg);
2509         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2510                 return 0;
2511         case SNDRV_PCM_IOCTL_TTSTAMP:
2512                 return snd_pcm_tstamp(substream, arg);
2513         case SNDRV_PCM_IOCTL_HW_REFINE:
2514                 return snd_pcm_hw_refine_user(substream, arg);
2515         case SNDRV_PCM_IOCTL_HW_PARAMS:
2516                 return snd_pcm_hw_params_user(substream, arg);
2517         case SNDRV_PCM_IOCTL_HW_FREE:
2518                 return snd_pcm_hw_free(substream);
2519         case SNDRV_PCM_IOCTL_SW_PARAMS:
2520                 return snd_pcm_sw_params_user(substream, arg);
2521         case SNDRV_PCM_IOCTL_STATUS:
2522                 return snd_pcm_status_user(substream, arg);
2523         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2524                 return snd_pcm_channel_info_user(substream, arg);
2525         case SNDRV_PCM_IOCTL_PREPARE:
2526                 return snd_pcm_prepare(substream, file);
2527         case SNDRV_PCM_IOCTL_RESET:
2528                 return snd_pcm_reset(substream);
2529         case SNDRV_PCM_IOCTL_START:
2530                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2531         case SNDRV_PCM_IOCTL_LINK:
2532                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2533         case SNDRV_PCM_IOCTL_UNLINK:
2534                 return snd_pcm_unlink(substream);
2535         case SNDRV_PCM_IOCTL_RESUME:
2536                 return snd_pcm_resume(substream);
2537         case SNDRV_PCM_IOCTL_XRUN:
2538                 return snd_pcm_xrun(substream);
2539         case SNDRV_PCM_IOCTL_HWSYNC:
2540                 return snd_pcm_hwsync(substream);
2541         case SNDRV_PCM_IOCTL_DELAY:
2542                 return snd_pcm_delay(substream, arg);
2543         case SNDRV_PCM_IOCTL_SYNC_PTR:
2544                 return snd_pcm_sync_ptr(substream, arg);
2545 #ifdef CONFIG_SND_SUPPORT_OLD_API
2546         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2547                 return snd_pcm_hw_refine_old_user(substream, arg);
2548         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2549                 return snd_pcm_hw_params_old_user(substream, arg);
2550 #endif
2551         case SNDRV_PCM_IOCTL_DRAIN:
2552                 return snd_pcm_drain(substream, file);
2553         case SNDRV_PCM_IOCTL_DROP:
2554                 return snd_pcm_drop(substream);
2555         case SNDRV_PCM_IOCTL_PAUSE:
2556         {
2557                 int res;
2558                 snd_pcm_stream_lock_irq(substream);
2559                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2560                 snd_pcm_stream_unlock_irq(substream);
2561                 return res;
2562         }
2563         }
2564         snd_printd("unknown ioctl = 0x%x\n", cmd);
2565         return -ENOTTY;
2566 }
2567
2568 static int snd_pcm_playback_ioctl1(struct file *file,
2569                                    struct snd_pcm_substream *substream,
2570                                    unsigned int cmd, void __user *arg)
2571 {
2572         if (snd_BUG_ON(!substream))
2573                 return -ENXIO;
2574         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2575                 return -EINVAL;
2576         switch (cmd) {
2577         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2578         {
2579                 struct snd_xferi xferi;
2580                 struct snd_xferi __user *_xferi = arg;
2581                 struct snd_pcm_runtime *runtime = substream->runtime;
2582                 snd_pcm_sframes_t result;
2583                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2584                         return -EBADFD;
2585                 if (put_user(0, &_xferi->result))
2586                         return -EFAULT;
2587                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2588                         return -EFAULT;
2589                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2590                 __put_user(result, &_xferi->result);
2591                 return result < 0 ? result : 0;
2592         }
2593         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2594         {
2595                 struct snd_xfern xfern;
2596                 struct snd_xfern __user *_xfern = arg;
2597                 struct snd_pcm_runtime *runtime = substream->runtime;
2598                 void __user **bufs;
2599                 snd_pcm_sframes_t result;
2600                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2601                         return -EBADFD;
2602                 if (runtime->channels > 128)
2603                         return -EINVAL;
2604                 if (put_user(0, &_xfern->result))
2605                         return -EFAULT;
2606                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2607                         return -EFAULT;
2608
2609                 bufs = memdup_user(xfern.bufs,
2610                                    sizeof(void *) * runtime->channels);
2611                 if (IS_ERR(bufs))
2612                         return PTR_ERR(bufs);
2613                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2614                 kfree(bufs);
2615                 __put_user(result, &_xfern->result);
2616                 return result < 0 ? result : 0;
2617         }
2618         case SNDRV_PCM_IOCTL_REWIND:
2619         {
2620                 snd_pcm_uframes_t frames;
2621                 snd_pcm_uframes_t __user *_frames = arg;
2622                 snd_pcm_sframes_t result;
2623                 if (get_user(frames, _frames))
2624                         return -EFAULT;
2625                 if (put_user(0, _frames))
2626                         return -EFAULT;
2627                 result = snd_pcm_playback_rewind(substream, frames);
2628                 __put_user(result, _frames);
2629                 return result < 0 ? result : 0;
2630         }
2631         case SNDRV_PCM_IOCTL_FORWARD:
2632         {
2633                 snd_pcm_uframes_t frames;
2634                 snd_pcm_uframes_t __user *_frames = arg;
2635                 snd_pcm_sframes_t result;
2636                 if (get_user(frames, _frames))
2637                         return -EFAULT;
2638                 if (put_user(0, _frames))
2639                         return -EFAULT;
2640                 result = snd_pcm_playback_forward(substream, frames);
2641                 __put_user(result, _frames);
2642                 return result < 0 ? result : 0;
2643         }
2644         }
2645         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2646 }
2647
2648 static int snd_pcm_capture_ioctl1(struct file *file,
2649                                   struct snd_pcm_substream *substream,
2650                                   unsigned int cmd, void __user *arg)
2651 {
2652         if (snd_BUG_ON(!substream))
2653                 return -ENXIO;
2654         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2655                 return -EINVAL;
2656         switch (cmd) {
2657         case SNDRV_PCM_IOCTL_READI_FRAMES:
2658         {
2659                 struct snd_xferi xferi;
2660                 struct snd_xferi __user *_xferi = arg;
2661                 struct snd_pcm_runtime *runtime = substream->runtime;
2662                 snd_pcm_sframes_t result;
2663                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2664                         return -EBADFD;
2665                 if (put_user(0, &_xferi->result))
2666                         return -EFAULT;
2667                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2668                         return -EFAULT;
2669                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2670                 __put_user(result, &_xferi->result);
2671                 return result < 0 ? result : 0;
2672         }
2673         case SNDRV_PCM_IOCTL_READN_FRAMES:
2674         {
2675                 struct snd_xfern xfern;
2676                 struct snd_xfern __user *_xfern = arg;
2677                 struct snd_pcm_runtime *runtime = substream->runtime;
2678                 void *bufs;
2679                 snd_pcm_sframes_t result;
2680                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2681                         return -EBADFD;
2682                 if (runtime->channels > 128)
2683                         return -EINVAL;
2684                 if (put_user(0, &_xfern->result))
2685                         return -EFAULT;
2686                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2687                         return -EFAULT;
2688
2689                 bufs = memdup_user(xfern.bufs,
2690                                    sizeof(void *) * runtime->channels);
2691                 if (IS_ERR(bufs))
2692                         return PTR_ERR(bufs);
2693                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2694                 kfree(bufs);
2695                 __put_user(result, &_xfern->result);
2696                 return result < 0 ? result : 0;
2697         }
2698         case SNDRV_PCM_IOCTL_REWIND:
2699         {
2700                 snd_pcm_uframes_t frames;
2701                 snd_pcm_uframes_t __user *_frames = arg;
2702                 snd_pcm_sframes_t result;
2703                 if (get_user(frames, _frames))
2704                         return -EFAULT;
2705                 if (put_user(0, _frames))
2706                         return -EFAULT;
2707                 result = snd_pcm_capture_rewind(substream, frames);
2708                 __put_user(result, _frames);
2709                 return result < 0 ? result : 0;
2710         }
2711         case SNDRV_PCM_IOCTL_FORWARD:
2712         {
2713                 snd_pcm_uframes_t frames;
2714                 snd_pcm_uframes_t __user *_frames = arg;
2715                 snd_pcm_sframes_t result;
2716                 if (get_user(frames, _frames))
2717                         return -EFAULT;
2718                 if (put_user(0, _frames))
2719                         return -EFAULT;
2720                 result = snd_pcm_capture_forward(substream, frames);
2721                 __put_user(result, _frames);
2722                 return result < 0 ? result : 0;
2723         }
2724         }
2725         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2726 }
2727
2728 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2729                                    unsigned long arg)
2730 {
2731         struct snd_pcm_file *pcm_file;
2732
2733         pcm_file = file->private_data;
2734
2735         if (((cmd >> 8) & 0xff) != 'A')
2736                 return -ENOTTY;
2737
2738         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2739                                        (void __user *)arg);
2740 }
2741
2742 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2743                                   unsigned long arg)
2744 {
2745         struct snd_pcm_file *pcm_file;
2746
2747         pcm_file = file->private_data;
2748
2749         if (((cmd >> 8) & 0xff) != 'A')
2750                 return -ENOTTY;
2751
2752         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2753                                       (void __user *)arg);
2754 }
2755
2756 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2757                          unsigned int cmd, void *arg)
2758 {
2759         mm_segment_t fs;
2760         int result;
2761
2762         fs = snd_enter_user();
2763         switch (substream->stream) {
2764         case SNDRV_PCM_STREAM_PLAYBACK:
2765                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2766                                                  (void __user *)arg);
2767                 break;
2768         case SNDRV_PCM_STREAM_CAPTURE:
2769                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2770                                                 (void __user *)arg);
2771                 break;
2772         default:
2773                 result = -EINVAL;
2774                 break;
2775         }
2776         snd_leave_user(fs);
2777         return result;
2778 }
2779
2780 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2781
2782 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2783                             loff_t * offset)
2784 {
2785         struct snd_pcm_file *pcm_file;
2786         struct snd_pcm_substream *substream;
2787         struct snd_pcm_runtime *runtime;
2788         snd_pcm_sframes_t result;
2789
2790         pcm_file = file->private_data;
2791         substream = pcm_file->substream;
2792         if (PCM_RUNTIME_CHECK(substream))
2793                 return -ENXIO;
2794         runtime = substream->runtime;
2795         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2796                 return -EBADFD;
2797         if (!frame_aligned(runtime, count))
2798                 return -EINVAL;
2799         count = bytes_to_frames(runtime, count);
2800         result = snd_pcm_lib_read(substream, buf, count);
2801         if (result > 0)
2802                 result = frames_to_bytes(runtime, result);
2803         return result;
2804 }
2805
2806 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2807                              size_t count, loff_t * offset)
2808 {
2809         struct snd_pcm_file *pcm_file;
2810         struct snd_pcm_substream *substream;
2811         struct snd_pcm_runtime *runtime;
2812         snd_pcm_sframes_t result;
2813
2814         pcm_file = file->private_data;
2815         substream = pcm_file->substream;
2816         if (PCM_RUNTIME_CHECK(substream))
2817                 return -ENXIO;
2818         runtime = substream->runtime;
2819         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2820                 return -EBADFD;
2821         if (!frame_aligned(runtime, count))
2822                 return -EINVAL;
2823         count = bytes_to_frames(runtime, count);
2824         result = snd_pcm_lib_write(substream, buf, count);
2825         if (result > 0)
2826                 result = frames_to_bytes(runtime, result);
2827         return result;
2828 }
2829
2830 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2831                              unsigned long nr_segs, loff_t pos)
2832
2833 {
2834         struct snd_pcm_file *pcm_file;
2835         struct snd_pcm_substream *substream;
2836         struct snd_pcm_runtime *runtime;
2837         snd_pcm_sframes_t result;
2838         unsigned long i;
2839         void __user **bufs;
2840         snd_pcm_uframes_t frames;
2841
2842         pcm_file = iocb->ki_filp->private_data;
2843         substream = pcm_file->substream;
2844         if (PCM_RUNTIME_CHECK(substream))
2845                 return -ENXIO;
2846         runtime = substream->runtime;
2847         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2848                 return -EBADFD;
2849         if (nr_segs > 1024 || nr_segs != runtime->channels)
2850                 return -EINVAL;
2851         if (!frame_aligned(runtime, iov->iov_len))
2852                 return -EINVAL;
2853         frames = bytes_to_samples(runtime, iov->iov_len);
2854         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2855         if (bufs == NULL)
2856                 return -ENOMEM;
2857         for (i = 0; i < nr_segs; ++i)
2858                 bufs[i] = iov[i].iov_base;
2859         result = snd_pcm_lib_readv(substream, bufs, frames);
2860         if (result > 0)
2861                 result = frames_to_bytes(runtime, result);
2862         kfree(bufs);
2863         return result;
2864 }
2865
2866 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2867                               unsigned long nr_segs, loff_t pos)
2868 {
2869         struct snd_pcm_file *pcm_file;
2870         struct snd_pcm_substream *substream;
2871         struct snd_pcm_runtime *runtime;
2872         snd_pcm_sframes_t result;
2873         unsigned long i;
2874         void __user **bufs;
2875         snd_pcm_uframes_t frames;
2876
2877         pcm_file = iocb->ki_filp->private_data;
2878         substream = pcm_file->substream;
2879         if (PCM_RUNTIME_CHECK(substream))
2880                 return -ENXIO;
2881         runtime = substream->runtime;
2882         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2883                 return -EBADFD;
2884         if (nr_segs > 128 || nr_segs != runtime->channels ||
2885             !frame_aligned(runtime, iov->iov_len))
2886                 return -EINVAL;
2887         frames = bytes_to_samples(runtime, iov->iov_len);
2888         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2889         if (bufs == NULL)
2890                 return -ENOMEM;
2891         for (i = 0; i < nr_segs; ++i)
2892                 bufs[i] = iov[i].iov_base;
2893         result = snd_pcm_lib_writev(substream, bufs, frames);
2894         if (result > 0)
2895                 result = frames_to_bytes(runtime, result);
2896         kfree(bufs);
2897         return result;
2898 }
2899
2900 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2901 {
2902         struct snd_pcm_file *pcm_file;
2903         struct snd_pcm_substream *substream;
2904         struct snd_pcm_runtime *runtime;
2905         unsigned int mask;
2906         snd_pcm_uframes_t avail;
2907
2908         pcm_file = file->private_data;
2909
2910         substream = pcm_file->substream;
2911         if (PCM_RUNTIME_CHECK(substream))
2912                 return -ENXIO;
2913         runtime = substream->runtime;
2914
2915         poll_wait(file, &runtime->sleep, wait);
2916
2917         snd_pcm_stream_lock_irq(substream);
2918         avail = snd_pcm_playback_avail(runtime);
2919         switch (runtime->status->state) {
2920         case SNDRV_PCM_STATE_RUNNING:
2921         case SNDRV_PCM_STATE_PREPARED:
2922         case SNDRV_PCM_STATE_PAUSED:
2923                 if (avail >= runtime->control->avail_min) {
2924                         mask = POLLOUT | POLLWRNORM;
2925                         break;
2926                 }
2927                 /* Fall through */
2928         case SNDRV_PCM_STATE_DRAINING:
2929                 mask = 0;
2930                 break;
2931         default:
2932                 mask = POLLOUT | POLLWRNORM | POLLERR;
2933                 break;
2934         }
2935         snd_pcm_stream_unlock_irq(substream);
2936         return mask;
2937 }
2938
2939 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2940 {
2941         struct snd_pcm_file *pcm_file;
2942         struct snd_pcm_substream *substream;
2943         struct snd_pcm_runtime *runtime;
2944         unsigned int mask;
2945         snd_pcm_uframes_t avail;
2946
2947         pcm_file = file->private_data;
2948
2949         substream = pcm_file->substream;
2950         if (PCM_RUNTIME_CHECK(substream))
2951                 return -ENXIO;
2952         runtime = substream->runtime;
2953
2954         poll_wait(file, &runtime->sleep, wait);
2955
2956         snd_pcm_stream_lock_irq(substream);
2957         avail = snd_pcm_capture_avail(runtime);
2958         switch (runtime->status->state) {
2959         case SNDRV_PCM_STATE_RUNNING:
2960         case SNDRV_PCM_STATE_PREPARED:
2961         case SNDRV_PCM_STATE_PAUSED:
2962                 if (avail >= runtime->control->avail_min) {
2963                         mask = POLLIN | POLLRDNORM;
2964                         break;
2965                 }
2966                 mask = 0;
2967                 break;
2968         case SNDRV_PCM_STATE_DRAINING:
2969                 if (avail > 0) {
2970                         mask = POLLIN | POLLRDNORM;
2971                         break;
2972                 }
2973                 /* Fall through */
2974         default:
2975                 mask = POLLIN | POLLRDNORM | POLLERR;
2976                 break;
2977         }
2978         snd_pcm_stream_unlock_irq(substream);
2979         return mask;
2980 }
2981
2982 /*
2983  * mmap support
2984  */
2985
2986 /*
2987  * Only on coherent architectures, we can mmap the status and the control records
2988  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2989  */
2990 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2991 /*
2992  * mmap status record
2993  */
2994 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2995                                                 struct vm_fault *vmf)
2996 {
2997         struct snd_pcm_substream *substream = area->vm_private_data;
2998         struct snd_pcm_runtime *runtime;
2999
3000         if (substream == NULL)
3001                 return VM_FAULT_SIGBUS;
3002         runtime = substream->runtime;
3003         vmf->page = virt_to_page(runtime->status);
3004         get_page(vmf->page);
3005         return 0;
3006 }
3007
3008 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3009 {
3010         .fault =        snd_pcm_mmap_status_fault,
3011 };
3012
3013 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3014                                struct vm_area_struct *area)
3015 {
3016         struct snd_pcm_runtime *runtime;
3017         long size;
3018         if (!(area->vm_flags & VM_READ))
3019                 return -EINVAL;
3020         runtime = substream->runtime;
3021         size = area->vm_end - area->vm_start;
3022         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3023                 return -EINVAL;
3024         area->vm_ops = &snd_pcm_vm_ops_status;
3025         area->vm_private_data = substream;
3026         area->vm_flags |= VM_RESERVED;
3027         return 0;
3028 }
3029
3030 /*
3031  * mmap control record
3032  */
3033 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3034                                                 struct vm_fault *vmf)
3035 {
3036         struct snd_pcm_substream *substream = area->vm_private_data;
3037         struct snd_pcm_runtime *runtime;
3038
3039         if (substream == NULL)
3040                 return VM_FAULT_SIGBUS;
3041         runtime = substream->runtime;
3042         vmf->page = virt_to_page(runtime->control);
3043         get_page(vmf->page);
3044         return 0;
3045 }
3046
3047 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3048 {
3049         .fault =        snd_pcm_mmap_control_fault,
3050 };
3051
3052 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3053                                 struct vm_area_struct *area)
3054 {
3055         struct snd_pcm_runtime *runtime;
3056         long size;
3057         if (!(area->vm_flags & VM_READ))
3058                 return -EINVAL;
3059         runtime = substream->runtime;
3060         size = area->vm_end - area->vm_start;
3061         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3062                 return -EINVAL;
3063         area->vm_ops = &snd_pcm_vm_ops_control;
3064         area->vm_private_data = substream;
3065         area->vm_flags |= VM_RESERVED;
3066         return 0;
3067 }
3068 #else /* ! coherent mmap */
3069 /*
3070  * don't support mmap for status and control records.
3071  */
3072 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3073                                struct vm_area_struct *area)
3074 {
3075         return -ENXIO;
3076 }
3077 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3078                                 struct vm_area_struct *area)
3079 {
3080         return -ENXIO;
3081 }
3082 #endif /* coherent mmap */
3083
3084 static inline struct page *
3085 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3086 {
3087         void *vaddr = substream->runtime->dma_area + ofs;
3088 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3089         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3090                 return virt_to_page(CAC_ADDR(vaddr));
3091 #endif
3092 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3093         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3094                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3095                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3096                 /* assume dma_handle set via pfn_to_phys() in
3097                  * mm/dma-noncoherent.c
3098                  */
3099                 return pfn_to_page(addr >> PAGE_SHIFT);
3100         }
3101 #endif
3102         return virt_to_page(vaddr);
3103 }
3104
3105 /*
3106  * fault callback for mmapping a RAM page
3107  */
3108 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3109                                                 struct vm_fault *vmf)
3110 {
3111         struct snd_pcm_substream *substream = area->vm_private_data;
3112         struct snd_pcm_runtime *runtime;
3113         unsigned long offset;
3114         struct page * page;
3115         size_t dma_bytes;
3116
3117         if (substream == NULL)
3118                 return VM_FAULT_SIGBUS;
3119         runtime = substream->runtime;
3120         offset = vmf->pgoff << PAGE_SHIFT;
3121         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3122         if (offset > dma_bytes - PAGE_SIZE)
3123                 return VM_FAULT_SIGBUS;
3124         if (substream->ops->page)
3125                 page = substream->ops->page(substream, offset);
3126         else
3127                 page = snd_pcm_default_page_ops(substream, offset);
3128         if (!page)
3129                 return VM_FAULT_SIGBUS;
3130         get_page(page);
3131         vmf->page = page;
3132         return 0;
3133 }
3134
3135 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3136         .open =         snd_pcm_mmap_data_open,
3137         .close =        snd_pcm_mmap_data_close,
3138 };
3139
3140 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3141         .open =         snd_pcm_mmap_data_open,
3142         .close =        snd_pcm_mmap_data_close,
3143         .fault =        snd_pcm_mmap_data_fault,
3144 };
3145
3146 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3147 /* This should be defined / handled globally! */
3148 #ifdef CONFIG_ARM
3149 #define ARCH_HAS_DMA_MMAP_COHERENT
3150 #endif
3151 #endif
3152
3153 /*
3154  * mmap the DMA buffer on RAM
3155  */
3156 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3157                                 struct vm_area_struct *area)
3158 {
3159         area->vm_flags |= VM_RESERVED;
3160 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3161         if (!substream->ops->page &&
3162             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3163                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3164                                          area,
3165                                          substream->runtime->dma_area,
3166                                          substream->runtime->dma_addr,
3167                                          area->vm_end - area->vm_start);
3168 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3169         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3170             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3171                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3172 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3173         /* mmap with fault handler */
3174         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3175         return 0;
3176 }
3177
3178 /*
3179  * mmap the DMA buffer on I/O memory area
3180  */
3181 #if SNDRV_PCM_INFO_MMAP_IOMEM
3182 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3183                            struct vm_area_struct *area)
3184 {
3185         long size;
3186         unsigned long offset;
3187
3188         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3189         area->vm_flags |= VM_IO;
3190         size = area->vm_end - area->vm_start;
3191         offset = area->vm_pgoff << PAGE_SHIFT;
3192         if (io_remap_pfn_range(area, area->vm_start,
3193                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3194                                 size, area->vm_page_prot))
3195                 return -EAGAIN;
3196         return 0;
3197 }
3198
3199 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3200 #endif /* SNDRV_PCM_INFO_MMAP */
3201
3202 /* mmap callback with pgprot_noncached */
3203 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3204                                struct vm_area_struct *area)
3205 {
3206         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3207         return snd_pcm_default_mmap(substream, area);
3208 }
3209 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3210
3211 /*
3212  * mmap DMA buffer
3213  */
3214 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3215                       struct vm_area_struct *area)
3216 {
3217         struct snd_pcm_runtime *runtime;
3218         long size;
3219         unsigned long offset;
3220         size_t dma_bytes;
3221         int err;
3222
3223         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3224                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3225                         return -EINVAL;
3226         } else {
3227                 if (!(area->vm_flags & VM_READ))
3228                         return -EINVAL;
3229         }
3230         runtime = substream->runtime;
3231         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3232                 return -EBADFD;
3233         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3234                 return -ENXIO;
3235         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3236             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3237                 return -EINVAL;
3238         size = area->vm_end - area->vm_start;
3239         offset = area->vm_pgoff << PAGE_SHIFT;
3240         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3241         if ((size_t)size > dma_bytes)
3242                 return -EINVAL;
3243         if (offset > dma_bytes - size)
3244                 return -EINVAL;
3245
3246         area->vm_ops = &snd_pcm_vm_ops_data;
3247         area->vm_private_data = substream;
3248         if (substream->ops->mmap)
3249                 err = substream->ops->mmap(substream, area);
3250         else
3251                 err = snd_pcm_default_mmap(substream, area);
3252         if (!err)
3253                 atomic_inc(&substream->mmap_count);
3254         return err;
3255 }
3256
3257 EXPORT_SYMBOL(snd_pcm_mmap_data);
3258
3259 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3260 {
3261         struct snd_pcm_file * pcm_file;
3262         struct snd_pcm_substream *substream;
3263         unsigned long offset;
3264
3265         pcm_file = file->private_data;
3266         substream = pcm_file->substream;
3267         if (PCM_RUNTIME_CHECK(substream))
3268                 return -ENXIO;
3269
3270         offset = area->vm_pgoff << PAGE_SHIFT;
3271         switch (offset) {
3272         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3273                 if (pcm_file->no_compat_mmap)
3274                         return -ENXIO;
3275                 return snd_pcm_mmap_status(substream, file, area);
3276         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3277                 if (pcm_file->no_compat_mmap)
3278                         return -ENXIO;
3279                 return snd_pcm_mmap_control(substream, file, area);
3280         default:
3281                 return snd_pcm_mmap_data(substream, file, area);
3282         }
3283         return 0;
3284 }
3285
3286 static int snd_pcm_fasync(int fd, struct file * file, int on)
3287 {
3288         struct snd_pcm_file * pcm_file;
3289         struct snd_pcm_substream *substream;
3290         struct snd_pcm_runtime *runtime;
3291
3292         pcm_file = file->private_data;
3293         substream = pcm_file->substream;
3294         if (PCM_RUNTIME_CHECK(substream))
3295                 return -ENXIO;
3296         runtime = substream->runtime;
3297         return fasync_helper(fd, file, on, &runtime->fasync);
3298 }
3299
3300 /*
3301  * ioctl32 compat
3302  */
3303 #ifdef CONFIG_COMPAT
3304 #include "pcm_compat.c"
3305 #else
3306 #define snd_pcm_ioctl_compat    NULL
3307 #endif
3308
3309 /*
3310  *  To be removed helpers to keep binary compatibility
3311  */
3312
3313 #ifdef CONFIG_SND_SUPPORT_OLD_API
3314 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3315 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3316
3317 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3318                                                struct snd_pcm_hw_params_old *oparams)
3319 {
3320         unsigned int i;
3321
3322         memset(params, 0, sizeof(*params));
3323         params->flags = oparams->flags;
3324         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3325                 params->masks[i].bits[0] = oparams->masks[i];
3326         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3327         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3328         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3329         params->info = oparams->info;
3330         params->msbits = oparams->msbits;
3331         params->rate_num = oparams->rate_num;
3332         params->rate_den = oparams->rate_den;
3333         params->fifo_size = oparams->fifo_size;
3334 }
3335
3336 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3337                                              struct snd_pcm_hw_params *params)
3338 {
3339         unsigned int i;
3340
3341         memset(oparams, 0, sizeof(*oparams));
3342         oparams->flags = params->flags;
3343         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3344                 oparams->masks[i] = params->masks[i].bits[0];
3345         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3346         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3347         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3348         oparams->info = params->info;
3349         oparams->msbits = params->msbits;
3350         oparams->rate_num = params->rate_num;
3351         oparams->rate_den = params->rate_den;
3352         oparams->fifo_size = params->fifo_size;
3353 }
3354
3355 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3356                                       struct snd_pcm_hw_params_old __user * _oparams)
3357 {
3358         struct snd_pcm_hw_params *params;
3359         struct snd_pcm_hw_params_old *oparams = NULL;
3360         int err;
3361
3362         params = kmalloc(sizeof(*params), GFP_KERNEL);
3363         if (!params)
3364                 return -ENOMEM;
3365
3366         oparams = memdup_user(_oparams, sizeof(*oparams));
3367         if (IS_ERR(oparams)) {
3368                 err = PTR_ERR(oparams);
3369                 goto out;
3370         }
3371         snd_pcm_hw_convert_from_old_params(params, oparams);
3372         err = snd_pcm_hw_refine(substream, params);
3373         snd_pcm_hw_convert_to_old_params(oparams, params);
3374         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3375                 if (!err)
3376                         err = -EFAULT;
3377         }
3378
3379         kfree(oparams);
3380 out:
3381         kfree(params);
3382         return err;
3383 }
3384
3385 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3386                                       struct snd_pcm_hw_params_old __user * _oparams)
3387 {
3388         struct snd_pcm_hw_params *params;
3389         struct snd_pcm_hw_params_old *oparams = NULL;
3390         int err;
3391
3392         params = kmalloc(sizeof(*params), GFP_KERNEL);
3393         if (!params)
3394                 return -ENOMEM;
3395
3396         oparams = memdup_user(_oparams, sizeof(*oparams));
3397         if (IS_ERR(oparams)) {
3398                 err = PTR_ERR(oparams);
3399                 goto out;
3400         }
3401         snd_pcm_hw_convert_from_old_params(params, oparams);
3402         err = snd_pcm_hw_params(substream, params);
3403         snd_pcm_hw_convert_to_old_params(oparams, params);
3404         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3405                 if (!err)
3406                         err = -EFAULT;
3407         }
3408
3409         kfree(oparams);
3410 out:
3411         kfree(params);
3412         return err;
3413 }
3414 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3415
3416 #ifndef CONFIG_MMU
3417 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3418                                                unsigned long addr,
3419                                                unsigned long len,
3420                                                unsigned long pgoff,
3421                                                unsigned long flags)
3422 {
3423         struct snd_pcm_file *pcm_file = file->private_data;
3424         struct snd_pcm_substream *substream = pcm_file->substream;
3425         struct snd_pcm_runtime *runtime = substream->runtime;
3426         unsigned long offset = pgoff << PAGE_SHIFT;
3427
3428         switch (offset) {
3429         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3430                 return (unsigned long)runtime->status;
3431         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3432                 return (unsigned long)runtime->control;
3433         default:
3434                 return (unsigned long)runtime->dma_area + offset;
3435         }
3436 }
3437 #else
3438 # define snd_pcm_get_unmapped_area NULL
3439 #endif
3440
3441 /*
3442  *  Register section
3443  */
3444
3445 const struct file_operations snd_pcm_f_ops[2] = {
3446         {
3447                 .owner =                THIS_MODULE,
3448                 .write =                snd_pcm_write,
3449                 .aio_write =            snd_pcm_aio_write,
3450                 .open =                 snd_pcm_playback_open,
3451                 .release =              snd_pcm_release,
3452                 .llseek =               no_llseek,
3453                 .poll =                 snd_pcm_playback_poll,
3454                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3455                 .compat_ioctl =         snd_pcm_ioctl_compat,
3456                 .mmap =                 snd_pcm_mmap,
3457                 .fasync =               snd_pcm_fasync,
3458                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3459         },
3460         {
3461                 .owner =                THIS_MODULE,
3462                 .read =                 snd_pcm_read,
3463                 .aio_read =             snd_pcm_aio_read,
3464                 .open =                 snd_pcm_capture_open,
3465                 .release =              snd_pcm_release,
3466                 .llseek =               no_llseek,
3467                 .poll =                 snd_pcm_capture_poll,
3468                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3469                 .compat_ioctl =         snd_pcm_ioctl_compat,
3470                 .mmap =                 snd_pcm_mmap,
3471                 .fasync =               snd_pcm_fasync,
3472                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3473         }
3474 };