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 char *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->status->state = state;
 868         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 869             runtime->silence_size > 0)
 870                 snd_pcm_playback_silence(substream, ULONG_MAX);
 871         if (substream->timer)
 872                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 873                                  &runtime->trigger_tstamp);
 874 }
 875
 876 static struct action_ops snd_pcm_action_start = {
 877         .pre_action = snd_pcm_pre_start,
 878         .do_action = snd_pcm_do_start,
 879         .undo_action = snd_pcm_undo_start,
 880         .post_action = snd_pcm_post_start
 881 };
 882
 883 /**
 884  * snd_pcm_start - start all linked streams
 885  * @substream: the PCM substream instance
 886  */
 887 int snd_pcm_start(struct snd_pcm_substream *substream)
 888 {
 889         return snd_pcm_action(&snd_pcm_action_start, substream,
 890                               SNDRV_PCM_STATE_RUNNING);
 891 }
 892
 893 /*
 894  * stop callbacks
 895  */
 896 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 897 {
 898         struct snd_pcm_runtime *runtime = substream->runtime;
 899         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 900                 return -EBADFD;
 901         runtime->trigger_master = substream;
 902         return 0;
 903 }
 904
 905 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 906 {
 907         if (substream->runtime->trigger_master == substream &&
 908             snd_pcm_running(substream))
 909                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 910         return 0; /* unconditonally stop all substreams */
 911 }
 912
 913 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 914 {
 915         struct snd_pcm_runtime *runtime = substream->runtime;
 916         if (runtime->status->state != state) {
 917                 snd_pcm_trigger_tstamp(substream);
 918                 if (substream->timer)
 919                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 920                                          &runtime->trigger_tstamp);
 921                 runtime->status->state = state;
 922         }
 923         wake_up(&runtime->sleep);
 924         wake_up(&runtime->tsleep);
 925 }
 926
 927 static struct action_ops snd_pcm_action_stop = {
 928         .pre_action = snd_pcm_pre_stop,
 929         .do_action = snd_pcm_do_stop,
 930         .post_action = snd_pcm_post_stop
 931 };
 932
 933 /**
 934  * snd_pcm_stop - try to stop all running streams in the substream group
 935  * @substream: the PCM substream instance
 936  * @state: PCM state after stopping the stream
 937  *
 938  * The state of each stream is then changed to the given state unconditionally.
 939  */
 940 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 941 {
 942         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 943 }
 944
 945 EXPORT_SYMBOL(snd_pcm_stop);
 946
 947 /**
 948  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 949  * @substream: the PCM substream
 950  *
 951  * After stopping, the state is changed to SETUP.
 952  * Unlike snd_pcm_stop(), this affects only the given stream.
 953  */
 954 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 955 {
 956         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 957                                      SNDRV_PCM_STATE_SETUP);
 958 }
 959
 960 /*
 961  * pause callbacks
 962  */
 963 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 964 {
 965         struct snd_pcm_runtime *runtime = substream->runtime;
 966         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 967                 return -ENOSYS;
 968         if (push) {
 969                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 970                         return -EBADFD;
 971         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 972                 return -EBADFD;
 973         runtime->trigger_master = substream;
 974         return 0;
 975 }
 976
 977 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 978 {
 979         if (substream->runtime->trigger_master != substream)
 980                 return 0;
 981         /* some drivers might use hw_ptr to recover from the pause -
 982            update the hw_ptr now */
 983         if (push)
 984                 snd_pcm_update_hw_ptr(substream);
 985         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
 986          * a delta betwen the current jiffies, this gives a large enough
 987          * delta, effectively to skip the check once.
 988          */
 989         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
 990         return substream->ops->trigger(substream,
 991                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 992                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 993 }
 994
 995 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 996 {
 997         if (substream->runtime->trigger_master == substream)
 998                 substream->ops->trigger(substream,
 999                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1000                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1001 }
1002
1003 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1004 {
1005         struct snd_pcm_runtime *runtime = substream->runtime;
1006         snd_pcm_trigger_tstamp(substream);
1007         if (push) {
1008                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1009                 if (substream->timer)
1010                         snd_timer_notify(substream->timer,
1011                                          SNDRV_TIMER_EVENT_MPAUSE,
1012                                          &runtime->trigger_tstamp);
1013                 wake_up(&runtime->sleep);
1014                 wake_up(&runtime->tsleep);
1015         } else {
1016                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1017                 if (substream->timer)
1018                         snd_timer_notify(substream->timer,
1019                                          SNDRV_TIMER_EVENT_MCONTINUE,
1020                                          &runtime->trigger_tstamp);
1021         }
1022 }
1023
1024 static struct action_ops snd_pcm_action_pause = {
1025         .pre_action = snd_pcm_pre_pause,
1026         .do_action = snd_pcm_do_pause,
1027         .undo_action = snd_pcm_undo_pause,
1028         .post_action = snd_pcm_post_pause
1029 };
1030
1031 /*
1032  * Push/release the pause for all linked streams.
1033  */
1034 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1035 {
1036         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1037 }
1038
1039 #ifdef CONFIG_PM
1040 /* suspend */
1041
1042 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1043 {
1044         struct snd_pcm_runtime *runtime = substream->runtime;
1045         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1046                 return -EBUSY;
1047         runtime->trigger_master = substream;
1048         return 0;
1049 }
1050
1051 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1052 {
1053         struct snd_pcm_runtime *runtime = substream->runtime;
1054         if (runtime->trigger_master != substream)
1055                 return 0;
1056         if (! snd_pcm_running(substream))
1057                 return 0;
1058         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1059         return 0; /* suspend unconditionally */
1060 }
1061
1062 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1063 {
1064         struct snd_pcm_runtime *runtime = substream->runtime;
1065         snd_pcm_trigger_tstamp(substream);
1066         if (substream->timer)
1067                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1068                                  &runtime->trigger_tstamp);
1069         runtime->status->suspended_state = runtime->status->state;
1070         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1071         wake_up(&runtime->sleep);
1072         wake_up(&runtime->tsleep);
1073 }
1074
1075 static struct action_ops snd_pcm_action_suspend = {
1076         .pre_action = snd_pcm_pre_suspend,
1077         .do_action = snd_pcm_do_suspend,
1078         .post_action = snd_pcm_post_suspend
1079 };
1080
1081 /**
1082  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1083  * @substream: the PCM substream
1084  *
1085  * After this call, all streams are changed to SUSPENDED state.
1086  */
1087 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1088 {
1089         int err;
1090         unsigned long flags;
1091
1092         if (! substream)
1093                 return 0;
1094
1095         snd_pcm_stream_lock_irqsave(substream, flags);
1096         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1097         snd_pcm_stream_unlock_irqrestore(substream, flags);
1098         return err;
1099 }
1100
1101 EXPORT_SYMBOL(snd_pcm_suspend);
1102
1103 /**
1104  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1105  * @pcm: the PCM instance
1106  *
1107  * After this call, all streams are changed to SUSPENDED state.
1108  */
1109 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1110 {
1111         struct snd_pcm_substream *substream;
1112         int stream, err = 0;
1113
1114         if (! pcm)
1115                 return 0;
1116
1117         for (stream = 0; stream < 2; stream++) {
1118                 for (substream = pcm->streams[stream].substream;
1119                      substream; substream = substream->next) {
1120                         /* FIXME: the open/close code should lock this as well */
1121                         if (substream->runtime == NULL)
1122                                 continue;
1123                         err = snd_pcm_suspend(substream);
1124                         if (err < 0 && err != -EBUSY)
1125                                 return err;
1126                 }
1127         }
1128         return 0;
1129 }
1130
1131 EXPORT_SYMBOL(snd_pcm_suspend_all);
1132
1133 /* resume */
1134
1135 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1136 {
1137         struct snd_pcm_runtime *runtime = substream->runtime;
1138         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1139                 return -ENOSYS;
1140         runtime->trigger_master = substream;
1141         return 0;
1142 }
1143
1144 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1145 {
1146         struct snd_pcm_runtime *runtime = substream->runtime;
1147         if (runtime->trigger_master != substream)
1148                 return 0;
1149         /* DMA not running previously? */
1150         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1151             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1152              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1153                 return 0;
1154         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1155 }
1156
1157 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1158 {
1159         if (substream->runtime->trigger_master == substream &&
1160             snd_pcm_running(substream))
1161                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1162 }
1163
1164 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1165 {
1166         struct snd_pcm_runtime *runtime = substream->runtime;
1167         snd_pcm_trigger_tstamp(substream);
1168         if (substream->timer)
1169                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1170                                  &runtime->trigger_tstamp);
1171         runtime->status->state = runtime->status->suspended_state;
1172 }
1173
1174 static struct action_ops snd_pcm_action_resume = {
1175         .pre_action = snd_pcm_pre_resume,
1176         .do_action = snd_pcm_do_resume,
1177         .undo_action = snd_pcm_undo_resume,
1178         .post_action = snd_pcm_post_resume
1179 };
1180
1181 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1182 {
1183         struct snd_card *card = substream->pcm->card;
1184         int res;
1185
1186         snd_power_lock(card);
1187         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1188                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1189         snd_power_unlock(card);
1190         return res;
1191 }
1192
1193 #else
1194
1195 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1196 {
1197         return -ENOSYS;
1198 }
1199
1200 #endif /* CONFIG_PM */
1201
1202 /*
1203  * xrun ioctl
1204  *
1205  * Change the RUNNING stream(s) to XRUN state.
1206  */
1207 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1208 {
1209         struct snd_card *card = substream->pcm->card;
1210         struct snd_pcm_runtime *runtime = substream->runtime;
1211         int result;
1212
1213         snd_power_lock(card);
1214         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1215                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1216                 if (result < 0)
1217                         goto _unlock;
1218         }
1219
1220         snd_pcm_stream_lock_irq(substream);
1221         switch (runtime->status->state) {
1222         case SNDRV_PCM_STATE_XRUN:
1223                 result = 0;     /* already there */
1224                 break;
1225         case SNDRV_PCM_STATE_RUNNING:
1226                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1227                 break;
1228         default:
1229                 result = -EBADFD;
1230         }
1231         snd_pcm_stream_unlock_irq(substream);
1232  _unlock:
1233         snd_power_unlock(card);
1234         return result;
1235 }
1236
1237 /*
1238  * reset ioctl
1239  */
1240 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1241 {
1242         struct snd_pcm_runtime *runtime = substream->runtime;
1243         switch (runtime->status->state) {
1244         case SNDRV_PCM_STATE_RUNNING:
1245         case SNDRV_PCM_STATE_PREPARED:
1246         case SNDRV_PCM_STATE_PAUSED:
1247         case SNDRV_PCM_STATE_SUSPENDED:
1248                 return 0;
1249         default:
1250                 return -EBADFD;
1251         }
1252 }
1253
1254 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1255 {
1256         struct snd_pcm_runtime *runtime = substream->runtime;
1257         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1258         if (err < 0)
1259                 return err;
1260         runtime->hw_ptr_base = 0;
1261         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1262                 runtime->status->hw_ptr % runtime->period_size;
1263         runtime->silence_start = runtime->status->hw_ptr;
1264         runtime->silence_filled = 0;
1265         return 0;
1266 }
1267
1268 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1269 {
1270         struct snd_pcm_runtime *runtime = substream->runtime;
1271         runtime->control->appl_ptr = runtime->status->hw_ptr;
1272         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1273             runtime->silence_size > 0)
1274                 snd_pcm_playback_silence(substream, ULONG_MAX);
1275 }
1276
1277 static struct action_ops snd_pcm_action_reset = {
1278         .pre_action = snd_pcm_pre_reset,
1279         .do_action = snd_pcm_do_reset,
1280         .post_action = snd_pcm_post_reset
1281 };
1282
1283 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1284 {
1285         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1286 }
1287
1288 /*
1289  * prepare ioctl
1290  */
1291 /* we use the second argument for updating f_flags */
1292 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1293                                int f_flags)
1294 {
1295         struct snd_pcm_runtime *runtime = substream->runtime;
1296         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1297             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1298                 return -EBADFD;
1299         if (snd_pcm_running(substream))
1300                 return -EBUSY;
1301         substream->f_flags = f_flags;
1302         return 0;
1303 }
1304
1305 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1306 {
1307         int err;
1308         err = substream->ops->prepare(substream);
1309         if (err < 0)
1310                 return err;
1311         return snd_pcm_do_reset(substream, 0);
1312 }
1313
1314 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1315 {
1316         struct snd_pcm_runtime *runtime = substream->runtime;
1317         runtime->control->appl_ptr = runtime->status->hw_ptr;
1318         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1319 }
1320
1321 static struct action_ops snd_pcm_action_prepare = {
1322         .pre_action = snd_pcm_pre_prepare,
1323         .do_action = snd_pcm_do_prepare,
1324         .post_action = snd_pcm_post_prepare
1325 };
1326
1327 /**
1328  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1329  * @substream: the PCM substream instance
1330  * @file: file to refer f_flags
1331  */
1332 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1333                            struct file *file)
1334 {
1335         int res;
1336         struct snd_card *card = substream->pcm->card;
1337         int f_flags;
1338
1339         if (file)
1340                 f_flags = file->f_flags;
1341         else
1342                 f_flags = substream->f_flags;
1343
1344         snd_power_lock(card);
1345         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1346                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1347                                                substream, f_flags);
1348         snd_power_unlock(card);
1349         return res;
1350 }
1351
1352 /*
1353  * drain ioctl
1354  */
1355
1356 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1357 {
1358         substream->runtime->trigger_master = substream;
1359         return 0;
1360 }
1361
1362 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1363 {
1364         struct snd_pcm_runtime *runtime = substream->runtime;
1365         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1366                 switch (runtime->status->state) {
1367                 case SNDRV_PCM_STATE_PREPARED:
1368                         /* start playback stream if possible */
1369                         if (! snd_pcm_playback_empty(substream)) {
1370                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1371                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1372                         }
1373                         break;
1374                 case SNDRV_PCM_STATE_RUNNING:
1375                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1376                         break;
1377                 default:
1378                         break;
1379                 }
1380         } else {
1381                 /* stop running stream */
1382                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1383                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1384                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1385                         snd_pcm_do_stop(substream, new_state);
1386                         snd_pcm_post_stop(substream, new_state);
1387                 }
1388         }
1389         return 0;
1390 }
1391
1392 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1393 {
1394 }
1395
1396 static struct action_ops snd_pcm_action_drain_init = {
1397         .pre_action = snd_pcm_pre_drain_init,
1398         .do_action = snd_pcm_do_drain_init,
1399         .post_action = snd_pcm_post_drain_init
1400 };
1401
1402 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1403
1404 /*
1405  * Drain the stream(s).
1406  * When the substream is linked, sync until the draining of all playback streams
1407  * is finished.
1408  * After this call, all streams are supposed to be either SETUP or DRAINING
1409  * (capture only) state.
1410  */
1411 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1412                          struct file *file)
1413 {
1414         struct snd_card *card;
1415         struct snd_pcm_runtime *runtime;
1416         struct snd_pcm_substream *s;
1417         wait_queue_t wait;
1418         int result = 0;
1419         int nonblock = 0;
1420
1421         card = substream->pcm->card;
1422         runtime = substream->runtime;
1423
1424         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1425                 return -EBADFD;
1426
1427         snd_power_lock(card);
1428         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1429                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1430                 if (result < 0) {
1431                         snd_power_unlock(card);
1432                         return result;
1433                 }
1434         }
1435
1436         if (file) {
1437                 if (file->f_flags & O_NONBLOCK)
1438                         nonblock = 1;
1439         } else if (substream->f_flags & O_NONBLOCK)
1440                 nonblock = 1;
1441
1442         down_read(&snd_pcm_link_rwsem);
1443         snd_pcm_stream_lock_irq(substream);
1444         /* resume pause */
1445         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1446                 snd_pcm_pause(substream, 0);
1447
1448         /* pre-start/stop - all running streams are changed to DRAINING state */
1449         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1450         if (result < 0)
1451                 goto unlock;
1452         /* in non-blocking, we don't wait in ioctl but let caller poll */
1453         if (nonblock) {
1454                 result = -EAGAIN;
1455                 goto unlock;
1456         }
1457
1458         for (;;) {
1459                 long tout;
1460                 struct snd_pcm_runtime *to_check;
1461                 if (signal_pending(current)) {
1462                         result = -ERESTARTSYS;
1463                         break;
1464                 }
1465                 /* find a substream to drain */
1466                 to_check = NULL;
1467                 snd_pcm_group_for_each_entry(s, substream) {
1468                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1469                                 continue;
1470                         runtime = s->runtime;
1471                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1472                                 to_check = runtime;
1473                                 break;
1474                         }
1475                 }
1476                 if (!to_check)
1477                         break; /* all drained */
1478                 init_waitqueue_entry(&wait, current);
1479                 add_wait_queue(&to_check->sleep, &wait);
1480                 set_current_state(TASK_INTERRUPTIBLE);
1481                 snd_pcm_stream_unlock_irq(substream);
1482                 up_read(&snd_pcm_link_rwsem);
1483                 snd_power_unlock(card);
1484                 tout = schedule_timeout(10 * HZ);
1485                 snd_power_lock(card);
1486                 down_read(&snd_pcm_link_rwsem);
1487                 snd_pcm_stream_lock_irq(substream);
1488                 remove_wait_queue(&to_check->sleep, &wait);
1489                 if (tout == 0) {
1490                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1491                                 result = -ESTRPIPE;
1492                         else {
1493                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1494                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1495                                 result = -EIO;
1496                         }
1497                         break;
1498                 }
1499         }
1500
1501  unlock:
1502         snd_pcm_stream_unlock_irq(substream);
1503         up_read(&snd_pcm_link_rwsem);
1504         snd_power_unlock(card);
1505
1506         return result;
1507 }
1508
1509 /*
1510  * drop ioctl
1511  *
1512  * Immediately put all linked substreams into SETUP state.
1513  */
1514 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1515 {
1516         struct snd_pcm_runtime *runtime;
1517         struct snd_card *card;
1518         int result = 0;
1519
1520         if (PCM_RUNTIME_CHECK(substream))
1521                 return -ENXIO;
1522         runtime = substream->runtime;
1523         card = substream->pcm->card;
1524
1525         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1526             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1527             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1528                 return -EBADFD;
1529
1530         snd_pcm_stream_lock_irq(substream);
1531         /* resume pause */
1532         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1533                 snd_pcm_pause(substream, 0);
1534
1535         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1536         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1537         snd_pcm_stream_unlock_irq(substream);
1538
1539         return result;
1540 }
1541
1542
1543 /* WARNING: Don't forget to fput back the file */
1544 static struct file *snd_pcm_file_fd(int fd)
1545 {
1546         struct file *file;
1547         struct inode *inode;
1548         unsigned int minor;
1549
1550         file = fget(fd);
1551         if (!file)
1552                 return NULL;
1553         inode = file->f_path.dentry->d_inode;
1554         if (!S_ISCHR(inode->i_mode) ||
1555             imajor(inode) != snd_major) {
1556                 fput(file);
1557                 return NULL;
1558         }
1559         minor = iminor(inode);
1560         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1561             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1562                 fput(file);
1563                 return NULL;
1564         }
1565         return file;
1566 }
1567
1568 /*
1569  * PCM link handling
1570  */
1571 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1572 {
1573         int res = 0;
1574         struct file *file;
1575         struct snd_pcm_file *pcm_file;
1576         struct snd_pcm_substream *substream1;
1577
1578         file = snd_pcm_file_fd(fd);
1579         if (!file)
1580                 return -EBADFD;
1581         pcm_file = file->private_data;
1582         substream1 = pcm_file->substream;
1583         down_write(&snd_pcm_link_rwsem);
1584         write_lock_irq(&snd_pcm_link_rwlock);
1585         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1586             substream->runtime->status->state != substream1->runtime->status->state) {
1587                 res = -EBADFD;
1588                 goto _end;
1589         }
1590         if (snd_pcm_stream_linked(substream1)) {
1591                 res = -EALREADY;
1592                 goto _end;
1593         }
1594         if (!snd_pcm_stream_linked(substream)) {
1595                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1596                 if (substream->group == NULL) {
1597                         res = -ENOMEM;
1598                         goto _end;
1599                 }
1600                 spin_lock_init(&substream->group->lock);
1601                 INIT_LIST_HEAD(&substream->group->substreams);
1602                 list_add_tail(&substream->link_list, &substream->group->substreams);
1603                 substream->group->count = 1;
1604         }
1605         list_add_tail(&substream1->link_list, &substream->group->substreams);
1606         substream->group->count++;
1607         substream1->group = substream->group;
1608  _end:
1609         write_unlock_irq(&snd_pcm_link_rwlock);
1610         up_write(&snd_pcm_link_rwsem);
1611         fput(file);
1612         return res;
1613 }
1614
1615 static void relink_to_local(struct snd_pcm_substream *substream)
1616 {
1617         substream->group = &substream->self_group;
1618         INIT_LIST_HEAD(&substream->self_group.substreams);
1619         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1620 }
1621
1622 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1623 {
1624         struct snd_pcm_substream *s;
1625         int res = 0;
1626
1627         down_write(&snd_pcm_link_rwsem);
1628         write_lock_irq(&snd_pcm_link_rwlock);
1629         if (!snd_pcm_stream_linked(substream)) {
1630                 res = -EALREADY;
1631                 goto _end;
1632         }
1633         list_del(&substream->link_list);
1634         substream->group->count--;
1635         if (substream->group->count == 1) {     /* detach the last stream, too */
1636                 snd_pcm_group_for_each_entry(s, substream) {
1637                         relink_to_local(s);
1638                         break;
1639                 }
1640                 kfree(substream->group);
1641         }
1642         relink_to_local(substream);
1643        _end:
1644         write_unlock_irq(&snd_pcm_link_rwlock);
1645         up_write(&snd_pcm_link_rwsem);
1646         return res;
1647 }
1648
1649 /*
1650  * hw configurator
1651  */
1652 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1653                                struct snd_pcm_hw_rule *rule)
1654 {
1655         struct snd_interval t;
1656         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1657                      hw_param_interval_c(params, rule->deps[1]), &t);
1658         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1659 }
1660
1661 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1662                                struct snd_pcm_hw_rule *rule)
1663 {
1664         struct snd_interval t;
1665         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1666                      hw_param_interval_c(params, rule->deps[1]), &t);
1667         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1668 }
1669
1670 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1671                                    struct snd_pcm_hw_rule *rule)
1672 {
1673         struct snd_interval t;
1674         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1675                          hw_param_interval_c(params, rule->deps[1]),
1676                          (unsigned long) rule->private, &t);
1677         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1678 }
1679
1680 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1681                                    struct snd_pcm_hw_rule *rule)
1682 {
1683         struct snd_interval t;
1684         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1685                          (unsigned long) rule->private,
1686                          hw_param_interval_c(params, rule->deps[1]), &t);
1687         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1688 }
1689
1690 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1691                                   struct snd_pcm_hw_rule *rule)
1692 {
1693         unsigned int k;
1694         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1695         struct snd_mask m;
1696         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1697         snd_mask_any(&m);
1698         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1699                 int bits;
1700                 if (! snd_mask_test(mask, k))
1701                         continue;
1702                 bits = snd_pcm_format_physical_width(k);
1703                 if (bits <= 0)
1704                         continue; /* ignore invalid formats */
1705                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1706                         snd_mask_reset(&m, k);
1707         }
1708         return snd_mask_refine(mask, &m);
1709 }
1710
1711 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1712                                        struct snd_pcm_hw_rule *rule)
1713 {
1714         struct snd_interval t;
1715         unsigned int k;
1716         t.min = UINT_MAX;
1717         t.max = 0;
1718         t.openmin = 0;
1719         t.openmax = 0;
1720         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1721                 int bits;
1722                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1723                         continue;
1724                 bits = snd_pcm_format_physical_width(k);
1725                 if (bits <= 0)
1726                         continue; /* ignore invalid formats */
1727                 if (t.min > (unsigned)bits)
1728                         t.min = bits;
1729                 if (t.max < (unsigned)bits)
1730                         t.max = bits;
1731         }
1732         t.integer = 1;
1733         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1734 }
1735
1736 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1737 #error "Change this table"
1738 #endif
1739
1740 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1741                                  48000, 64000, 88200, 96000, 176400, 192000 };
1742
1743 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1744         .count = ARRAY_SIZE(rates),
1745         .list = rates,
1746 };
1747
1748 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1749                                 struct snd_pcm_hw_rule *rule)
1750 {
1751         struct snd_pcm_hardware *hw = rule->private;
1752         return snd_interval_list(hw_param_interval(params, rule->var),
1753                                  snd_pcm_known_rates.count,
1754                                  snd_pcm_known_rates.list, hw->rates);
1755 }
1756
1757 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1758                                             struct snd_pcm_hw_rule *rule)
1759 {
1760         struct snd_interval t;
1761         struct snd_pcm_substream *substream = rule->private;
1762         t.min = 0;
1763         t.max = substream->buffer_bytes_max;
1764         t.openmin = 0;
1765         t.openmax = 0;
1766         t.integer = 1;
1767         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1768 }
1769
1770 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1771 {
1772         struct snd_pcm_runtime *runtime = substream->runtime;
1773         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1774         int k, err;
1775
1776         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1777                 snd_mask_any(constrs_mask(constrs, k));
1778         }
1779
1780         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1781                 snd_interval_any(constrs_interval(constrs, k));
1782         }
1783
1784         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1785         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1786         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1787         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1788         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1789
1790         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1791                                    snd_pcm_hw_rule_format, NULL,
1792                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1793         if (err < 0)
1794                 return err;
1795         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1796                                   snd_pcm_hw_rule_sample_bits, NULL,
1797                                   SNDRV_PCM_HW_PARAM_FORMAT,
1798                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1799         if (err < 0)
1800                 return err;
1801         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1802                                   snd_pcm_hw_rule_div, NULL,
1803                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1804         if (err < 0)
1805                 return err;
1806         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1807                                   snd_pcm_hw_rule_mul, NULL,
1808                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1809         if (err < 0)
1810                 return err;
1811         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1812                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1813                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1814         if (err < 0)
1815                 return err;
1816         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1817                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1818                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1819         if (err < 0)
1820                 return err;
1821         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1822                                   snd_pcm_hw_rule_div, NULL,
1823                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1824         if (err < 0)
1825                 return err;
1826         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1827                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1828                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1829         if (err < 0)
1830                 return err;
1831         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1832                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1833                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1834         if (err < 0)
1835                 return err;
1836         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1837                                   snd_pcm_hw_rule_div, NULL,
1838                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1839         if (err < 0)
1840                 return err;
1841         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1842                                   snd_pcm_hw_rule_div, NULL,
1843                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1844         if (err < 0)
1845                 return err;
1846         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1847                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1848                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1849         if (err < 0)
1850                 return err;
1851         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1852                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1853                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1854         if (err < 0)
1855                 return err;
1856         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1857                                   snd_pcm_hw_rule_mul, NULL,
1858                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1859         if (err < 0)
1860                 return err;
1861         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1862                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1863                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1864         if (err < 0)
1865                 return err;
1866         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1867                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1868                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1869         if (err < 0)
1870                 return err;
1871         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1872                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1873                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1874         if (err < 0)
1875                 return err;
1876         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1877                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1878                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1879         if (err < 0)
1880                 return err;
1881         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1882                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1883                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1884         if (err < 0)
1885                 return err;
1886         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1887                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1888                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1889         if (err < 0)
1890                 return err;
1891         return 0;
1892 }
1893
1894 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1895 {
1896         struct snd_pcm_runtime *runtime = substream->runtime;
1897         struct snd_pcm_hardware *hw = &runtime->hw;
1898         int err;
1899         unsigned int mask = 0;
1900
1901         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1902                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1903         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1904                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1905         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1906                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1907                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1908                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1909                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1910                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1911                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1912         }
1913         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1914         if (err < 0)
1915                 return err;
1916
1917         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1918         if (err < 0)
1919                 return err;
1920
1921         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1922         if (err < 0)
1923                 return err;
1924
1925         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1926                                            hw->channels_min, hw->channels_max);
1927         if (err < 0)
1928                 return err;
1929
1930         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1931                                            hw->rate_min, hw->rate_max);
1932         if (err < 0)
1933                 return err;
1934
1935         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1936                                            hw->period_bytes_min, hw->period_bytes_max);
1937         if (err < 0)
1938                 return err;
1939
1940         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1941                                            hw->periods_min, hw->periods_max);
1942         if (err < 0)
1943                 return err;
1944
1945         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1946                                            hw->period_bytes_min, hw->buffer_bytes_max);
1947         if (err < 0)
1948                 return err;
1949
1950         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1951                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1952                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1953         if (err < 0)
1954                 return err;
1955
1956         /* FIXME: remove */
1957         if (runtime->dma_bytes) {
1958                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1959                 if (err < 0)
1960                         return -EINVAL;
1961         }
1962
1963         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1964                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1965                                           snd_pcm_hw_rule_rate, hw,
1966                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1967                 if (err < 0)
1968                         return err;
1969         }
1970
1971         /* FIXME: this belong to lowlevel */
1972         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1973
1974         return 0;
1975 }
1976
1977 static void pcm_release_private(struct snd_pcm_substream *substream)
1978 {
1979         snd_pcm_unlink(substream);
1980 }
1981
1982 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1983 {
1984         substream->ref_count--;
1985         if (substream->ref_count > 0)
1986                 return;
1987
1988         snd_pcm_drop(substream);
1989         if (substream->hw_opened) {
1990                 if (substream->ops->hw_free != NULL)
1991                         substream->ops->hw_free(substream);
1992                 substream->ops->close(substream);
1993                 substream->hw_opened = 0;
1994         }
1995         if (pm_qos_request_active(&substream->latency_pm_qos_req))
1996                 pm_qos_remove_request(&substream->latency_pm_qos_req);
1997         if (substream->pcm_release) {
1998                 substream->pcm_release(substream);
1999                 substream->pcm_release = NULL;
2000         }
2001         snd_pcm_detach_substream(substream);
2002 }
2003
2004 EXPORT_SYMBOL(snd_pcm_release_substream);
2005
2006 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2007                            struct file *file,
2008                            struct snd_pcm_substream **rsubstream)
2009 {
2010         struct snd_pcm_substream *substream;
2011         int err;
2012
2013         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2014         if (err < 0)
2015                 return err;
2016         if (substream->ref_count > 1) {
2017                 *rsubstream = substream;
2018                 return 0;
2019         }
2020
2021         err = snd_pcm_hw_constraints_init(substream);
2022         if (err < 0) {
2023                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2024                 goto error;
2025         }
2026
2027         if ((err = substream->ops->open(substream)) < 0)
2028                 goto error;
2029
2030         substream->hw_opened = 1;
2031
2032         err = snd_pcm_hw_constraints_complete(substream);
2033         if (err < 0) {
2034                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2035                 goto error;
2036         }
2037
2038         *rsubstream = substream;
2039         return 0;
2040
2041  error:
2042         snd_pcm_release_substream(substream);
2043         return err;
2044 }
2045
2046 EXPORT_SYMBOL(snd_pcm_open_substream);
2047
2048 static int snd_pcm_open_file(struct file *file,
2049                              struct snd_pcm *pcm,
2050                              int stream,
2051                              struct snd_pcm_file **rpcm_file)
2052 {
2053         struct snd_pcm_file *pcm_file;
2054         struct snd_pcm_substream *substream;
2055         struct snd_pcm_str *str;
2056         int err;
2057
2058         if (rpcm_file)
2059                 *rpcm_file = NULL;
2060
2061         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2062         if (err < 0)
2063                 return err;
2064
2065         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2066         if (pcm_file == NULL) {
2067                 snd_pcm_release_substream(substream);
2068                 return -ENOMEM;
2069         }
2070         pcm_file->substream = substream;
2071         if (substream->ref_count == 1) {
2072                 str = substream->pstr;
2073                 substream->file = pcm_file;
2074                 substream->pcm_release = pcm_release_private;
2075         }
2076         file->private_data = pcm_file;
2077         if (rpcm_file)
2078                 *rpcm_file = pcm_file;
2079         return 0;
2080 }
2081
2082 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2083 {
2084         struct snd_pcm *pcm;
2085         int err = nonseekable_open(inode, file);
2086         if (err < 0)
2087                 return err;
2088         pcm = snd_lookup_minor_data(iminor(inode),
2089                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2090         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2091 }
2092
2093 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2094 {
2095         struct snd_pcm *pcm;
2096         int err = nonseekable_open(inode, file);
2097         if (err < 0)
2098                 return err;
2099         pcm = snd_lookup_minor_data(iminor(inode),
2100                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2101         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2102 }
2103
2104 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2105 {
2106         int err;
2107         struct snd_pcm_file *pcm_file;
2108         wait_queue_t wait;
2109
2110         if (pcm == NULL) {
2111                 err = -ENODEV;
2112                 goto __error1;
2113         }
2114         err = snd_card_file_add(pcm->card, file);
2115         if (err < 0)
2116                 goto __error1;
2117         if (!try_module_get(pcm->card->module)) {
2118                 err = -EFAULT;
2119                 goto __error2;
2120         }
2121         init_waitqueue_entry(&wait, current);
2122         add_wait_queue(&pcm->open_wait, &wait);
2123         mutex_lock(&pcm->open_mutex);
2124         while (1) {
2125                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2126                 if (err >= 0)
2127                         break;
2128                 if (err == -EAGAIN) {
2129                         if (file->f_flags & O_NONBLOCK) {
2130                                 err = -EBUSY;
2131                                 break;
2132                         }
2133                 } else
2134                         break;
2135                 set_current_state(TASK_INTERRUPTIBLE);
2136                 mutex_unlock(&pcm->open_mutex);
2137                 schedule();
2138                 mutex_lock(&pcm->open_mutex);
2139                 if (signal_pending(current)) {
2140                         err = -ERESTARTSYS;
2141                         break;
2142                 }
2143         }
2144         remove_wait_queue(&pcm->open_wait, &wait);
2145         mutex_unlock(&pcm->open_mutex);
2146         if (err < 0)
2147                 goto __error;
2148         return err;
2149
2150       __error:
2151         module_put(pcm->card->module);
2152       __error2:
2153         snd_card_file_remove(pcm->card, file);
2154       __error1:
2155         return err;
2156 }
2157
2158 static int snd_pcm_release(struct inode *inode, struct file *file)
2159 {
2160         struct snd_pcm *pcm;
2161         struct snd_pcm_substream *substream;
2162         struct snd_pcm_file *pcm_file;
2163
2164         pcm_file = file->private_data;
2165         substream = pcm_file->substream;
2166         if (snd_BUG_ON(!substream))
2167                 return -ENXIO;
2168         pcm = substream->pcm;
2169         mutex_lock(&pcm->open_mutex);
2170         snd_pcm_release_substream(substream);
2171         kfree(pcm_file);
2172         mutex_unlock(&pcm->open_mutex);
2173         wake_up(&pcm->open_wait);
2174         module_put(pcm->card->module);
2175         snd_card_file_remove(pcm->card, file);
2176         return 0;
2177 }
2178
2179 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2180                                                  snd_pcm_uframes_t frames)
2181 {
2182         struct snd_pcm_runtime *runtime = substream->runtime;
2183         snd_pcm_sframes_t appl_ptr;
2184         snd_pcm_sframes_t ret;
2185         snd_pcm_sframes_t hw_avail;
2186
2187         if (frames == 0)
2188                 return 0;
2189
2190         snd_pcm_stream_lock_irq(substream);
2191         switch (runtime->status->state) {
2192         case SNDRV_PCM_STATE_PREPARED:
2193                 break;
2194         case SNDRV_PCM_STATE_DRAINING:
2195         case SNDRV_PCM_STATE_RUNNING:
2196                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2197                         break;
2198                 /* Fall through */
2199         case SNDRV_PCM_STATE_XRUN:
2200                 ret = -EPIPE;
2201                 goto __end;
2202         case SNDRV_PCM_STATE_SUSPENDED:
2203                 ret = -ESTRPIPE;
2204                 goto __end;
2205         default:
2206                 ret = -EBADFD;
2207                 goto __end;
2208         }
2209
2210         hw_avail = snd_pcm_playback_hw_avail(runtime);
2211         if (hw_avail <= 0) {
2212                 ret = 0;
2213                 goto __end;
2214         }
2215         if (frames > (snd_pcm_uframes_t)hw_avail)
2216                 frames = hw_avail;
2217         appl_ptr = runtime->control->appl_ptr - frames;
2218         if (appl_ptr < 0)
2219                 appl_ptr += runtime->boundary;
2220         runtime->control->appl_ptr = appl_ptr;
2221         ret = frames;
2222  __end:
2223         snd_pcm_stream_unlock_irq(substream);
2224         return ret;
2225 }
2226
2227 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2228                                                 snd_pcm_uframes_t frames)
2229 {
2230         struct snd_pcm_runtime *runtime = substream->runtime;
2231         snd_pcm_sframes_t appl_ptr;
2232         snd_pcm_sframes_t ret;
2233         snd_pcm_sframes_t hw_avail;
2234
2235         if (frames == 0)
2236                 return 0;
2237
2238         snd_pcm_stream_lock_irq(substream);
2239         switch (runtime->status->state) {
2240         case SNDRV_PCM_STATE_PREPARED:
2241         case SNDRV_PCM_STATE_DRAINING:
2242                 break;
2243         case SNDRV_PCM_STATE_RUNNING:
2244                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2245                         break;
2246                 /* Fall through */
2247         case SNDRV_PCM_STATE_XRUN:
2248                 ret = -EPIPE;
2249                 goto __end;
2250         case SNDRV_PCM_STATE_SUSPENDED:
2251                 ret = -ESTRPIPE;
2252                 goto __end;
2253         default:
2254                 ret = -EBADFD;
2255                 goto __end;
2256         }
2257
2258         hw_avail = snd_pcm_capture_hw_avail(runtime);
2259         if (hw_avail <= 0) {
2260                 ret = 0;
2261                 goto __end;
2262         }
2263         if (frames > (snd_pcm_uframes_t)hw_avail)
2264                 frames = hw_avail;
2265         appl_ptr = runtime->control->appl_ptr - frames;
2266         if (appl_ptr < 0)
2267                 appl_ptr += runtime->boundary;
2268         runtime->control->appl_ptr = appl_ptr;
2269         ret = frames;
2270  __end:
2271         snd_pcm_stream_unlock_irq(substream);
2272         return ret;
2273 }
2274
2275 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2276                                                   snd_pcm_uframes_t frames)
2277 {
2278         struct snd_pcm_runtime *runtime = substream->runtime;
2279         snd_pcm_sframes_t appl_ptr;
2280         snd_pcm_sframes_t ret;
2281         snd_pcm_sframes_t avail;
2282
2283         if (frames == 0)
2284                 return 0;
2285
2286         snd_pcm_stream_lock_irq(substream);
2287         switch (runtime->status->state) {
2288         case SNDRV_PCM_STATE_PREPARED:
2289         case SNDRV_PCM_STATE_PAUSED:
2290                 break;
2291         case SNDRV_PCM_STATE_DRAINING:
2292         case SNDRV_PCM_STATE_RUNNING:
2293                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2294                         break;
2295                 /* Fall through */
2296         case SNDRV_PCM_STATE_XRUN:
2297                 ret = -EPIPE;
2298                 goto __end;
2299         case SNDRV_PCM_STATE_SUSPENDED:
2300                 ret = -ESTRPIPE;
2301                 goto __end;
2302         default:
2303                 ret = -EBADFD;
2304                 goto __end;
2305         }
2306
2307         avail = snd_pcm_playback_avail(runtime);
2308         if (avail <= 0) {
2309                 ret = 0;
2310                 goto __end;
2311         }
2312         if (frames > (snd_pcm_uframes_t)avail)
2313                 frames = avail;
2314         appl_ptr = runtime->control->appl_ptr + frames;
2315         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2316                 appl_ptr -= runtime->boundary;
2317         runtime->control->appl_ptr = appl_ptr;
2318         ret = frames;
2319  __end:
2320         snd_pcm_stream_unlock_irq(substream);
2321         return ret;
2322 }
2323
2324 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2325                                                  snd_pcm_uframes_t frames)
2326 {
2327         struct snd_pcm_runtime *runtime = substream->runtime;
2328         snd_pcm_sframes_t appl_ptr;
2329         snd_pcm_sframes_t ret;
2330         snd_pcm_sframes_t avail;
2331
2332         if (frames == 0)
2333                 return 0;
2334
2335         snd_pcm_stream_lock_irq(substream);
2336         switch (runtime->status->state) {
2337         case SNDRV_PCM_STATE_PREPARED:
2338         case SNDRV_PCM_STATE_DRAINING:
2339         case SNDRV_PCM_STATE_PAUSED:
2340                 break;
2341         case SNDRV_PCM_STATE_RUNNING:
2342                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343                         break;
2344                 /* Fall through */
2345         case SNDRV_PCM_STATE_XRUN:
2346                 ret = -EPIPE;
2347                 goto __end;
2348         case SNDRV_PCM_STATE_SUSPENDED:
2349                 ret = -ESTRPIPE;
2350                 goto __end;
2351         default:
2352                 ret = -EBADFD;
2353                 goto __end;
2354         }
2355
2356         avail = snd_pcm_capture_avail(runtime);
2357         if (avail <= 0) {
2358                 ret = 0;
2359                 goto __end;
2360         }
2361         if (frames > (snd_pcm_uframes_t)avail)
2362                 frames = avail;
2363         appl_ptr = runtime->control->appl_ptr + frames;
2364         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365                 appl_ptr -= runtime->boundary;
2366         runtime->control->appl_ptr = appl_ptr;
2367         ret = frames;
2368  __end:
2369         snd_pcm_stream_unlock_irq(substream);
2370         return ret;
2371 }
2372
2373 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2374 {
2375         struct snd_pcm_runtime *runtime = substream->runtime;
2376         int err;
2377
2378         snd_pcm_stream_lock_irq(substream);
2379         switch (runtime->status->state) {
2380         case SNDRV_PCM_STATE_DRAINING:
2381                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2382                         goto __badfd;
2383         case SNDRV_PCM_STATE_RUNNING:
2384                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2385                         break;
2386                 /* Fall through */
2387         case SNDRV_PCM_STATE_PREPARED:
2388         case SNDRV_PCM_STATE_SUSPENDED:
2389                 err = 0;
2390                 break;
2391         case SNDRV_PCM_STATE_XRUN:
2392                 err = -EPIPE;
2393                 break;
2394         default:
2395               __badfd:
2396                 err = -EBADFD;
2397                 break;
2398         }
2399         snd_pcm_stream_unlock_irq(substream);
2400         return err;
2401 }
2402
2403 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2404                          snd_pcm_sframes_t __user *res)
2405 {
2406         struct snd_pcm_runtime *runtime = substream->runtime;
2407         int err;
2408         snd_pcm_sframes_t n = 0;
2409
2410         snd_pcm_stream_lock_irq(substream);
2411         switch (runtime->status->state) {
2412         case SNDRV_PCM_STATE_DRAINING:
2413                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2414                         goto __badfd;
2415         case SNDRV_PCM_STATE_RUNNING:
2416                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2417                         break;
2418                 /* Fall through */
2419         case SNDRV_PCM_STATE_PREPARED:
2420         case SNDRV_PCM_STATE_SUSPENDED:
2421                 err = 0;
2422                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2423                         n = snd_pcm_playback_hw_avail(runtime);
2424                 else
2425                         n = snd_pcm_capture_avail(runtime);
2426                 n += runtime->delay;
2427                 break;
2428         case SNDRV_PCM_STATE_XRUN:
2429                 err = -EPIPE;
2430                 break;
2431         default:
2432               __badfd:
2433                 err = -EBADFD;
2434                 break;
2435         }
2436         snd_pcm_stream_unlock_irq(substream);
2437         if (!err)
2438                 if (put_user(n, res))
2439                         err = -EFAULT;
2440         return err;
2441 }
2442
2443 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2444                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2445 {
2446         struct snd_pcm_runtime *runtime = substream->runtime;
2447         struct snd_pcm_sync_ptr sync_ptr;
2448         volatile struct snd_pcm_mmap_status *status;
2449         volatile struct snd_pcm_mmap_control *control;
2450         int err;
2451
2452         memset(&sync_ptr, 0, sizeof(sync_ptr));
2453         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2454                 return -EFAULT;
2455         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2456                 return -EFAULT;
2457         status = runtime->status;
2458         control = runtime->control;
2459         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2460                 err = snd_pcm_hwsync(substream);
2461                 if (err < 0)
2462                         return err;
2463         }
2464         snd_pcm_stream_lock_irq(substream);
2465         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2466                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2467         else
2468                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2469         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2470                 control->avail_min = sync_ptr.c.control.avail_min;
2471         else
2472                 sync_ptr.c.control.avail_min = control->avail_min;
2473         sync_ptr.s.status.state = status->state;
2474         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2475         sync_ptr.s.status.tstamp = status->tstamp;
2476         sync_ptr.s.status.suspended_state = status->suspended_state;
2477         snd_pcm_stream_unlock_irq(substream);
2478         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2479                 return -EFAULT;
2480         return 0;
2481 }
2482
2483 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2484 {
2485         struct snd_pcm_runtime *runtime = substream->runtime;
2486         int arg;
2487
2488         if (get_user(arg, _arg))
2489                 return -EFAULT;
2490         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2491                 return -EINVAL;
2492         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2493         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2494                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2495         return 0;
2496 }
2497
2498 static int snd_pcm_common_ioctl1(struct file *file,
2499                                  struct snd_pcm_substream *substream,
2500                                  unsigned int cmd, void __user *arg)
2501 {
2502         switch (cmd) {
2503         case SNDRV_PCM_IOCTL_PVERSION:
2504                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2505         case SNDRV_PCM_IOCTL_INFO:
2506                 return snd_pcm_info_user(substream, arg);
2507         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2508                 return 0;
2509         case SNDRV_PCM_IOCTL_TTSTAMP:
2510                 return snd_pcm_tstamp(substream, arg);
2511         case SNDRV_PCM_IOCTL_HW_REFINE:
2512                 return snd_pcm_hw_refine_user(substream, arg);
2513         case SNDRV_PCM_IOCTL_HW_PARAMS:
2514                 return snd_pcm_hw_params_user(substream, arg);
2515         case SNDRV_PCM_IOCTL_HW_FREE:
2516                 return snd_pcm_hw_free(substream);
2517         case SNDRV_PCM_IOCTL_SW_PARAMS:
2518                 return snd_pcm_sw_params_user(substream, arg);
2519         case SNDRV_PCM_IOCTL_STATUS:
2520                 return snd_pcm_status_user(substream, arg);
2521         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2522                 return snd_pcm_channel_info_user(substream, arg);
2523         case SNDRV_PCM_IOCTL_PREPARE:
2524                 return snd_pcm_prepare(substream, file);
2525         case SNDRV_PCM_IOCTL_RESET:
2526                 return snd_pcm_reset(substream);
2527         case SNDRV_PCM_IOCTL_START:
2528                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2529         case SNDRV_PCM_IOCTL_LINK:
2530                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2531         case SNDRV_PCM_IOCTL_UNLINK:
2532                 return snd_pcm_unlink(substream);
2533         case SNDRV_PCM_IOCTL_RESUME:
2534                 return snd_pcm_resume(substream);
2535         case SNDRV_PCM_IOCTL_XRUN:
2536                 return snd_pcm_xrun(substream);
2537         case SNDRV_PCM_IOCTL_HWSYNC:
2538                 return snd_pcm_hwsync(substream);
2539         case SNDRV_PCM_IOCTL_DELAY:
2540                 return snd_pcm_delay(substream, arg);
2541         case SNDRV_PCM_IOCTL_SYNC_PTR:
2542                 return snd_pcm_sync_ptr(substream, arg);
2543 #ifdef CONFIG_SND_SUPPORT_OLD_API
2544         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2545                 return snd_pcm_hw_refine_old_user(substream, arg);
2546         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2547                 return snd_pcm_hw_params_old_user(substream, arg);
2548 #endif
2549         case SNDRV_PCM_IOCTL_DRAIN:
2550                 return snd_pcm_drain(substream, file);
2551         case SNDRV_PCM_IOCTL_DROP:
2552                 return snd_pcm_drop(substream);
2553         case SNDRV_PCM_IOCTL_PAUSE:
2554         {
2555                 int res;
2556                 snd_pcm_stream_lock_irq(substream);
2557                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2558                 snd_pcm_stream_unlock_irq(substream);
2559                 return res;
2560         }
2561         }
2562         snd_printd("unknown ioctl = 0x%x\n", cmd);
2563         return -ENOTTY;
2564 }
2565
2566 static int snd_pcm_playback_ioctl1(struct file *file,
2567                                    struct snd_pcm_substream *substream,
2568                                    unsigned int cmd, void __user *arg)
2569 {
2570         if (snd_BUG_ON(!substream))
2571                 return -ENXIO;
2572         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2573                 return -EINVAL;
2574         switch (cmd) {
2575         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2576         {
2577                 struct snd_xferi xferi;
2578                 struct snd_xferi __user *_xferi = arg;
2579                 struct snd_pcm_runtime *runtime = substream->runtime;
2580                 snd_pcm_sframes_t result;
2581                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2582                         return -EBADFD;
2583                 if (put_user(0, &_xferi->result))
2584                         return -EFAULT;
2585                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2586                         return -EFAULT;
2587                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2588                 __put_user(result, &_xferi->result);
2589                 return result < 0 ? result : 0;
2590         }
2591         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2592         {
2593                 struct snd_xfern xfern;
2594                 struct snd_xfern __user *_xfern = arg;
2595                 struct snd_pcm_runtime *runtime = substream->runtime;
2596                 void __user **bufs;
2597                 snd_pcm_sframes_t result;
2598                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2599                         return -EBADFD;
2600                 if (runtime->channels > 128)
2601                         return -EINVAL;
2602                 if (put_user(0, &_xfern->result))
2603                         return -EFAULT;
2604                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2605                         return -EFAULT;
2606
2607                 bufs = memdup_user(xfern.bufs,
2608                                    sizeof(void *) * runtime->channels);
2609                 if (IS_ERR(bufs))
2610                         return PTR_ERR(bufs);
2611                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2612                 kfree(bufs);
2613                 __put_user(result, &_xfern->result);
2614                 return result < 0 ? result : 0;
2615         }
2616         case SNDRV_PCM_IOCTL_REWIND:
2617         {
2618                 snd_pcm_uframes_t frames;
2619                 snd_pcm_uframes_t __user *_frames = arg;
2620                 snd_pcm_sframes_t result;
2621                 if (get_user(frames, _frames))
2622                         return -EFAULT;
2623                 if (put_user(0, _frames))
2624                         return -EFAULT;
2625                 result = snd_pcm_playback_rewind(substream, frames);
2626                 __put_user(result, _frames);
2627                 return result < 0 ? result : 0;
2628         }
2629         case SNDRV_PCM_IOCTL_FORWARD:
2630         {
2631                 snd_pcm_uframes_t frames;
2632                 snd_pcm_uframes_t __user *_frames = arg;
2633                 snd_pcm_sframes_t result;
2634                 if (get_user(frames, _frames))
2635                         return -EFAULT;
2636                 if (put_user(0, _frames))
2637                         return -EFAULT;
2638                 result = snd_pcm_playback_forward(substream, frames);
2639                 __put_user(result, _frames);
2640                 return result < 0 ? result : 0;
2641         }
2642         }
2643         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2644 }
2645
2646 static int snd_pcm_capture_ioctl1(struct file *file,
2647                                   struct snd_pcm_substream *substream,
2648                                   unsigned int cmd, void __user *arg)
2649 {
2650         if (snd_BUG_ON(!substream))
2651                 return -ENXIO;
2652         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2653                 return -EINVAL;
2654         switch (cmd) {
2655         case SNDRV_PCM_IOCTL_READI_FRAMES:
2656         {
2657                 struct snd_xferi xferi;
2658                 struct snd_xferi __user *_xferi = arg;
2659                 struct snd_pcm_runtime *runtime = substream->runtime;
2660                 snd_pcm_sframes_t result;
2661                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2662                         return -EBADFD;
2663                 if (put_user(0, &_xferi->result))
2664                         return -EFAULT;
2665                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2666                         return -EFAULT;
2667                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2668                 __put_user(result, &_xferi->result);
2669                 return result < 0 ? result : 0;
2670         }
2671         case SNDRV_PCM_IOCTL_READN_FRAMES:
2672         {
2673                 struct snd_xfern xfern;
2674                 struct snd_xfern __user *_xfern = arg;
2675                 struct snd_pcm_runtime *runtime = substream->runtime;
2676                 void *bufs;
2677                 snd_pcm_sframes_t result;
2678                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2679                         return -EBADFD;
2680                 if (runtime->channels > 128)
2681                         return -EINVAL;
2682                 if (put_user(0, &_xfern->result))
2683                         return -EFAULT;
2684                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2685                         return -EFAULT;
2686
2687                 bufs = memdup_user(xfern.bufs,
2688                                    sizeof(void *) * runtime->channels);
2689                 if (IS_ERR(bufs))
2690                         return PTR_ERR(bufs);
2691                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2692                 kfree(bufs);
2693                 __put_user(result, &_xfern->result);
2694                 return result < 0 ? result : 0;
2695         }
2696         case SNDRV_PCM_IOCTL_REWIND:
2697         {
2698                 snd_pcm_uframes_t frames;
2699                 snd_pcm_uframes_t __user *_frames = arg;
2700                 snd_pcm_sframes_t result;
2701                 if (get_user(frames, _frames))
2702                         return -EFAULT;
2703                 if (put_user(0, _frames))
2704                         return -EFAULT;
2705                 result = snd_pcm_capture_rewind(substream, frames);
2706                 __put_user(result, _frames);
2707                 return result < 0 ? result : 0;
2708         }
2709         case SNDRV_PCM_IOCTL_FORWARD:
2710         {
2711                 snd_pcm_uframes_t frames;
2712                 snd_pcm_uframes_t __user *_frames = arg;
2713                 snd_pcm_sframes_t result;
2714                 if (get_user(frames, _frames))
2715                         return -EFAULT;
2716                 if (put_user(0, _frames))
2717                         return -EFAULT;
2718                 result = snd_pcm_capture_forward(substream, frames);
2719                 __put_user(result, _frames);
2720                 return result < 0 ? result : 0;
2721         }
2722         }
2723         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2724 }
2725
2726 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2727                                    unsigned long arg)
2728 {
2729         struct snd_pcm_file *pcm_file;
2730
2731         pcm_file = file->private_data;
2732
2733         if (((cmd >> 8) & 0xff) != 'A')
2734                 return -ENOTTY;
2735
2736         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2737                                        (void __user *)arg);
2738 }
2739
2740 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2741                                   unsigned long arg)
2742 {
2743         struct snd_pcm_file *pcm_file;
2744
2745         pcm_file = file->private_data;
2746
2747         if (((cmd >> 8) & 0xff) != 'A')
2748                 return -ENOTTY;
2749
2750         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2751                                       (void __user *)arg);
2752 }
2753
2754 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2755                          unsigned int cmd, void *arg)
2756 {
2757         mm_segment_t fs;
2758         int result;
2759
2760         fs = snd_enter_user();
2761         switch (substream->stream) {
2762         case SNDRV_PCM_STREAM_PLAYBACK:
2763                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2764                                                  (void __user *)arg);
2765                 break;
2766         case SNDRV_PCM_STREAM_CAPTURE:
2767                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2768                                                 (void __user *)arg);
2769                 break;
2770         default:
2771                 result = -EINVAL;
2772                 break;
2773         }
2774         snd_leave_user(fs);
2775         return result;
2776 }
2777
2778 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2779
2780 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2781                             loff_t * offset)
2782 {
2783         struct snd_pcm_file *pcm_file;
2784         struct snd_pcm_substream *substream;
2785         struct snd_pcm_runtime *runtime;
2786         snd_pcm_sframes_t result;
2787
2788         pcm_file = file->private_data;
2789         substream = pcm_file->substream;
2790         if (PCM_RUNTIME_CHECK(substream))
2791                 return -ENXIO;
2792         runtime = substream->runtime;
2793         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2794                 return -EBADFD;
2795         if (!frame_aligned(runtime, count))
2796                 return -EINVAL;
2797         count = bytes_to_frames(runtime, count);
2798         result = snd_pcm_lib_read(substream, buf, count);
2799         if (result > 0)
2800                 result = frames_to_bytes(runtime, result);
2801         return result;
2802 }
2803
2804 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2805                              size_t count, loff_t * offset)
2806 {
2807         struct snd_pcm_file *pcm_file;
2808         struct snd_pcm_substream *substream;
2809         struct snd_pcm_runtime *runtime;
2810         snd_pcm_sframes_t result;
2811
2812         pcm_file = file->private_data;
2813         substream = pcm_file->substream;
2814         if (PCM_RUNTIME_CHECK(substream))
2815                 return -ENXIO;
2816         runtime = substream->runtime;
2817         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2818                 return -EBADFD;
2819         if (!frame_aligned(runtime, count))
2820                 return -EINVAL;
2821         count = bytes_to_frames(runtime, count);
2822         result = snd_pcm_lib_write(substream, buf, count);
2823         if (result > 0)
2824                 result = frames_to_bytes(runtime, result);
2825         return result;
2826 }
2827
2828 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2829                              unsigned long nr_segs, loff_t pos)
2830
2831 {
2832         struct snd_pcm_file *pcm_file;
2833         struct snd_pcm_substream *substream;
2834         struct snd_pcm_runtime *runtime;
2835         snd_pcm_sframes_t result;
2836         unsigned long i;
2837         void __user **bufs;
2838         snd_pcm_uframes_t frames;
2839
2840         pcm_file = iocb->ki_filp->private_data;
2841         substream = pcm_file->substream;
2842         if (PCM_RUNTIME_CHECK(substream))
2843                 return -ENXIO;
2844         runtime = substream->runtime;
2845         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2846                 return -EBADFD;
2847         if (nr_segs > 1024 || nr_segs != runtime->channels)
2848                 return -EINVAL;
2849         if (!frame_aligned(runtime, iov->iov_len))
2850                 return -EINVAL;
2851         frames = bytes_to_samples(runtime, iov->iov_len);
2852         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2853         if (bufs == NULL)
2854                 return -ENOMEM;
2855         for (i = 0; i < nr_segs; ++i)
2856                 bufs[i] = iov[i].iov_base;
2857         result = snd_pcm_lib_readv(substream, bufs, frames);
2858         if (result > 0)
2859                 result = frames_to_bytes(runtime, result);
2860         kfree(bufs);
2861         return result;
2862 }
2863
2864 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2865                               unsigned long nr_segs, loff_t pos)
2866 {
2867         struct snd_pcm_file *pcm_file;
2868         struct snd_pcm_substream *substream;
2869         struct snd_pcm_runtime *runtime;
2870         snd_pcm_sframes_t result;
2871         unsigned long i;
2872         void __user **bufs;
2873         snd_pcm_uframes_t frames;
2874
2875         pcm_file = iocb->ki_filp->private_data;
2876         substream = pcm_file->substream;
2877         if (PCM_RUNTIME_CHECK(substream))
2878                 return -ENXIO;
2879         runtime = substream->runtime;
2880         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2881                 return -EBADFD;
2882         if (nr_segs > 128 || nr_segs != runtime->channels ||
2883             !frame_aligned(runtime, iov->iov_len))
2884                 return -EINVAL;
2885         frames = bytes_to_samples(runtime, iov->iov_len);
2886         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2887         if (bufs == NULL)
2888                 return -ENOMEM;
2889         for (i = 0; i < nr_segs; ++i)
2890                 bufs[i] = iov[i].iov_base;
2891         result = snd_pcm_lib_writev(substream, bufs, frames);
2892         if (result > 0)
2893                 result = frames_to_bytes(runtime, result);
2894         kfree(bufs);
2895         return result;
2896 }
2897
2898 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2899 {
2900         struct snd_pcm_file *pcm_file;
2901         struct snd_pcm_substream *substream;
2902         struct snd_pcm_runtime *runtime;
2903         unsigned int mask;
2904         snd_pcm_uframes_t avail;
2905
2906         pcm_file = file->private_data;
2907
2908         substream = pcm_file->substream;
2909         if (PCM_RUNTIME_CHECK(substream))
2910                 return -ENXIO;
2911         runtime = substream->runtime;
2912
2913         poll_wait(file, &runtime->sleep, wait);
2914
2915         snd_pcm_stream_lock_irq(substream);
2916         avail = snd_pcm_playback_avail(runtime);
2917         switch (runtime->status->state) {
2918         case SNDRV_PCM_STATE_RUNNING:
2919         case SNDRV_PCM_STATE_PREPARED:
2920         case SNDRV_PCM_STATE_PAUSED:
2921                 if (avail >= runtime->control->avail_min) {
2922                         mask = POLLOUT | POLLWRNORM;
2923                         break;
2924                 }
2925                 /* Fall through */
2926         case SNDRV_PCM_STATE_DRAINING:
2927                 mask = 0;
2928                 break;
2929         default:
2930                 mask = POLLOUT | POLLWRNORM | POLLERR;
2931                 break;
2932         }
2933         snd_pcm_stream_unlock_irq(substream);
2934         return mask;
2935 }
2936
2937 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2938 {
2939         struct snd_pcm_file *pcm_file;
2940         struct snd_pcm_substream *substream;
2941         struct snd_pcm_runtime *runtime;
2942         unsigned int mask;
2943         snd_pcm_uframes_t avail;
2944
2945         pcm_file = file->private_data;
2946
2947         substream = pcm_file->substream;
2948         if (PCM_RUNTIME_CHECK(substream))
2949                 return -ENXIO;
2950         runtime = substream->runtime;
2951
2952         poll_wait(file, &runtime->sleep, wait);
2953
2954         snd_pcm_stream_lock_irq(substream);
2955         avail = snd_pcm_capture_avail(runtime);
2956         switch (runtime->status->state) {
2957         case SNDRV_PCM_STATE_RUNNING:
2958         case SNDRV_PCM_STATE_PREPARED:
2959         case SNDRV_PCM_STATE_PAUSED:
2960                 if (avail >= runtime->control->avail_min) {
2961                         mask = POLLIN | POLLRDNORM;
2962                         break;
2963                 }
2964                 mask = 0;
2965                 break;
2966         case SNDRV_PCM_STATE_DRAINING:
2967                 if (avail > 0) {
2968                         mask = POLLIN | POLLRDNORM;
2969                         break;
2970                 }
2971                 /* Fall through */
2972         default:
2973                 mask = POLLIN | POLLRDNORM | POLLERR;
2974                 break;
2975         }
2976         snd_pcm_stream_unlock_irq(substream);
2977         return mask;
2978 }
2979
2980 /*
2981  * mmap support
2982  */
2983
2984 /*
2985  * Only on coherent architectures, we can mmap the status and the control records
2986  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2987  */
2988 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2989 /*
2990  * mmap status record
2991  */
2992 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2993                                                 struct vm_fault *vmf)
2994 {
2995         struct snd_pcm_substream *substream = area->vm_private_data;
2996         struct snd_pcm_runtime *runtime;
2997
2998         if (substream == NULL)
2999                 return VM_FAULT_SIGBUS;
3000         runtime = substream->runtime;
3001         vmf->page = virt_to_page(runtime->status);
3002         get_page(vmf->page);
3003         return 0;
3004 }
3005
3006 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3007 {
3008         .fault =        snd_pcm_mmap_status_fault,
3009 };
3010
3011 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3012                                struct vm_area_struct *area)
3013 {
3014         struct snd_pcm_runtime *runtime;
3015         long size;
3016         if (!(area->vm_flags & VM_READ))
3017                 return -EINVAL;
3018         runtime = substream->runtime;
3019         size = area->vm_end - area->vm_start;
3020         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3021                 return -EINVAL;
3022         area->vm_ops = &snd_pcm_vm_ops_status;
3023         area->vm_private_data = substream;
3024         area->vm_flags |= VM_RESERVED;
3025         return 0;
3026 }
3027
3028 /*
3029  * mmap control record
3030  */
3031 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3032                                                 struct vm_fault *vmf)
3033 {
3034         struct snd_pcm_substream *substream = area->vm_private_data;
3035         struct snd_pcm_runtime *runtime;
3036
3037         if (substream == NULL)
3038                 return VM_FAULT_SIGBUS;
3039         runtime = substream->runtime;
3040         vmf->page = virt_to_page(runtime->control);
3041         get_page(vmf->page);
3042         return 0;
3043 }
3044
3045 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3046 {
3047         .fault =        snd_pcm_mmap_control_fault,
3048 };
3049
3050 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3051                                 struct vm_area_struct *area)
3052 {
3053         struct snd_pcm_runtime *runtime;
3054         long size;
3055         if (!(area->vm_flags & VM_READ))
3056                 return -EINVAL;
3057         runtime = substream->runtime;
3058         size = area->vm_end - area->vm_start;
3059         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3060                 return -EINVAL;
3061         area->vm_ops = &snd_pcm_vm_ops_control;
3062         area->vm_private_data = substream;
3063         area->vm_flags |= VM_RESERVED;
3064         return 0;
3065 }
3066 #else /* ! coherent mmap */
3067 /*
3068  * don't support mmap for status and control records.
3069  */
3070 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3071                                struct vm_area_struct *area)
3072 {
3073         return -ENXIO;
3074 }
3075 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3076                                 struct vm_area_struct *area)
3077 {
3078         return -ENXIO;
3079 }
3080 #endif /* coherent mmap */
3081
3082 static inline struct page *
3083 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3084 {
3085         void *vaddr = substream->runtime->dma_area + ofs;
3086 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3087         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3088                 return virt_to_page(CAC_ADDR(vaddr));
3089 #endif
3090 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3091         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3092                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3093                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3094                 /* assume dma_handle set via pfn_to_phys() in
3095                  * mm/dma-noncoherent.c
3096                  */
3097                 return pfn_to_page(addr >> PAGE_SHIFT);
3098         }
3099 #endif
3100         return virt_to_page(vaddr);
3101 }
3102
3103 /*
3104  * fault callback for mmapping a RAM page
3105  */
3106 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3107                                                 struct vm_fault *vmf)
3108 {
3109         struct snd_pcm_substream *substream = area->vm_private_data;
3110         struct snd_pcm_runtime *runtime;
3111         unsigned long offset;
3112         struct page * page;
3113         size_t dma_bytes;
3114
3115         if (substream == NULL)
3116                 return VM_FAULT_SIGBUS;
3117         runtime = substream->runtime;
3118         offset = vmf->pgoff << PAGE_SHIFT;
3119         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3120         if (offset > dma_bytes - PAGE_SIZE)
3121                 return VM_FAULT_SIGBUS;
3122         if (substream->ops->page)
3123                 page = substream->ops->page(substream, offset);
3124         else
3125                 page = snd_pcm_default_page_ops(substream, offset);
3126         if (!page)
3127                 return VM_FAULT_SIGBUS;
3128         get_page(page);
3129         vmf->page = page;
3130         return 0;
3131 }
3132
3133 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3134         .open =         snd_pcm_mmap_data_open,
3135         .close =        snd_pcm_mmap_data_close,
3136 };
3137
3138 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3139         .open =         snd_pcm_mmap_data_open,
3140         .close =        snd_pcm_mmap_data_close,
3141         .fault =        snd_pcm_mmap_data_fault,
3142 };
3143
3144 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3145 /* This should be defined / handled globally! */
3146 #ifdef CONFIG_ARM
3147 #define ARCH_HAS_DMA_MMAP_COHERENT
3148 #endif
3149 #endif
3150
3151 /*
3152  * mmap the DMA buffer on RAM
3153  */
3154 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3155                                 struct vm_area_struct *area)
3156 {
3157         area->vm_flags |= VM_RESERVED;
3158 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3159         if (!substream->ops->page &&
3160             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3161                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3162                                          area,
3163                                          substream->runtime->dma_area,
3164                                          substream->runtime->dma_addr,
3165                                          area->vm_end - area->vm_start);
3166 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3167         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3168             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3169                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3170 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3171         /* mmap with fault handler */
3172         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3173         return 0;
3174 }
3175
3176 /*
3177  * mmap the DMA buffer on I/O memory area
3178  */
3179 #if SNDRV_PCM_INFO_MMAP_IOMEM
3180 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3181                            struct vm_area_struct *area)
3182 {
3183         long size;
3184         unsigned long offset;
3185
3186         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3187         area->vm_flags |= VM_IO;
3188         size = area->vm_end - area->vm_start;
3189         offset = area->vm_pgoff << PAGE_SHIFT;
3190         if (io_remap_pfn_range(area, area->vm_start,
3191                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3192                                 size, area->vm_page_prot))
3193                 return -EAGAIN;
3194         return 0;
3195 }
3196
3197 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3198 #endif /* SNDRV_PCM_INFO_MMAP */
3199
3200 /* mmap callback with pgprot_noncached */
3201 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3202                                struct vm_area_struct *area)
3203 {
3204         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3205         return snd_pcm_default_mmap(substream, area);
3206 }
3207 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3208
3209 /*
3210  * mmap DMA buffer
3211  */
3212 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3213                       struct vm_area_struct *area)
3214 {
3215         struct snd_pcm_runtime *runtime;
3216         long size;
3217         unsigned long offset;
3218         size_t dma_bytes;
3219         int err;
3220
3221         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3222                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3223                         return -EINVAL;
3224         } else {
3225                 if (!(area->vm_flags & VM_READ))
3226                         return -EINVAL;
3227         }
3228         runtime = substream->runtime;
3229         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3230                 return -EBADFD;
3231         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3232                 return -ENXIO;
3233         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3234             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3235                 return -EINVAL;
3236         size = area->vm_end - area->vm_start;
3237         offset = area->vm_pgoff << PAGE_SHIFT;
3238         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3239         if ((size_t)size > dma_bytes)
3240                 return -EINVAL;
3241         if (offset > dma_bytes - size)
3242                 return -EINVAL;
3243
3244         area->vm_ops = &snd_pcm_vm_ops_data;
3245         area->vm_private_data = substream;
3246         if (substream->ops->mmap)
3247                 err = substream->ops->mmap(substream, area);
3248         else
3249                 err = snd_pcm_default_mmap(substream, area);
3250         if (!err)
3251                 atomic_inc(&substream->mmap_count);
3252         return err;
3253 }
3254
3255 EXPORT_SYMBOL(snd_pcm_mmap_data);
3256
3257 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3258 {
3259         struct snd_pcm_file * pcm_file;
3260         struct snd_pcm_substream *substream;
3261         unsigned long offset;
3262
3263         pcm_file = file->private_data;
3264         substream = pcm_file->substream;
3265         if (PCM_RUNTIME_CHECK(substream))
3266                 return -ENXIO;
3267
3268         offset = area->vm_pgoff << PAGE_SHIFT;
3269         switch (offset) {
3270         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3271                 if (pcm_file->no_compat_mmap)
3272                         return -ENXIO;
3273                 return snd_pcm_mmap_status(substream, file, area);
3274         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3275                 if (pcm_file->no_compat_mmap)
3276                         return -ENXIO;
3277                 return snd_pcm_mmap_control(substream, file, area);
3278         default:
3279                 return snd_pcm_mmap_data(substream, file, area);
3280         }
3281         return 0;
3282 }
3283
3284 static int snd_pcm_fasync(int fd, struct file * file, int on)
3285 {
3286         struct snd_pcm_file * pcm_file;
3287         struct snd_pcm_substream *substream;
3288         struct snd_pcm_runtime *runtime;
3289
3290         pcm_file = file->private_data;
3291         substream = pcm_file->substream;
3292         if (PCM_RUNTIME_CHECK(substream))
3293                 return -ENXIO;
3294         runtime = substream->runtime;
3295         return fasync_helper(fd, file, on, &runtime->fasync);
3296 }
3297
3298 /*
3299  * ioctl32 compat
3300  */
3301 #ifdef CONFIG_COMPAT
3302 #include "pcm_compat.c"
3303 #else
3304 #define snd_pcm_ioctl_compat    NULL
3305 #endif
3306
3307 /*
3308  *  To be removed helpers to keep binary compatibility
3309  */
3310
3311 #ifdef CONFIG_SND_SUPPORT_OLD_API
3312 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3313 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3314
3315 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3316                                                struct snd_pcm_hw_params_old *oparams)
3317 {
3318         unsigned int i;
3319
3320         memset(params, 0, sizeof(*params));
3321         params->flags = oparams->flags;
3322         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3323                 params->masks[i].bits[0] = oparams->masks[i];
3324         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3325         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3326         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3327         params->info = oparams->info;
3328         params->msbits = oparams->msbits;
3329         params->rate_num = oparams->rate_num;
3330         params->rate_den = oparams->rate_den;
3331         params->fifo_size = oparams->fifo_size;
3332 }
3333
3334 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3335                                              struct snd_pcm_hw_params *params)
3336 {
3337         unsigned int i;
3338
3339         memset(oparams, 0, sizeof(*oparams));
3340         oparams->flags = params->flags;
3341         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3342                 oparams->masks[i] = params->masks[i].bits[0];
3343         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3344         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3345         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3346         oparams->info = params->info;
3347         oparams->msbits = params->msbits;
3348         oparams->rate_num = params->rate_num;
3349         oparams->rate_den = params->rate_den;
3350         oparams->fifo_size = params->fifo_size;
3351 }
3352
3353 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3354                                       struct snd_pcm_hw_params_old __user * _oparams)
3355 {
3356         struct snd_pcm_hw_params *params;
3357         struct snd_pcm_hw_params_old *oparams = NULL;
3358         int err;
3359
3360         params = kmalloc(sizeof(*params), GFP_KERNEL);
3361         if (!params)
3362                 return -ENOMEM;
3363
3364         oparams = memdup_user(_oparams, sizeof(*oparams));
3365         if (IS_ERR(oparams)) {
3366                 err = PTR_ERR(oparams);
3367                 goto out;
3368         }
3369         snd_pcm_hw_convert_from_old_params(params, oparams);
3370         err = snd_pcm_hw_refine(substream, params);
3371         snd_pcm_hw_convert_to_old_params(oparams, params);
3372         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3373                 if (!err)
3374                         err = -EFAULT;
3375         }
3376
3377         kfree(oparams);
3378 out:
3379         kfree(params);
3380         return err;
3381 }
3382
3383 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3384                                       struct snd_pcm_hw_params_old __user * _oparams)
3385 {
3386         struct snd_pcm_hw_params *params;
3387         struct snd_pcm_hw_params_old *oparams = NULL;
3388         int err;
3389
3390         params = kmalloc(sizeof(*params), GFP_KERNEL);
3391         if (!params)
3392                 return -ENOMEM;
3393
3394         oparams = memdup_user(_oparams, sizeof(*oparams));
3395         if (IS_ERR(oparams)) {
3396                 err = PTR_ERR(oparams);
3397                 goto out;
3398         }
3399         snd_pcm_hw_convert_from_old_params(params, oparams);
3400         err = snd_pcm_hw_params(substream, params);
3401         snd_pcm_hw_convert_to_old_params(oparams, params);
3402         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3403                 if (!err)
3404                         err = -EFAULT;
3405         }
3406
3407         kfree(oparams);
3408 out:
3409         kfree(params);
3410         return err;
3411 }
3412 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3413
3414 #ifndef CONFIG_MMU
3415 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3416                                                unsigned long addr,
3417                                                unsigned long len,
3418                                                unsigned long pgoff,
3419                                                unsigned long flags)
3420 {
3421         struct snd_pcm_file *pcm_file = file->private_data;
3422         struct snd_pcm_substream *substream = pcm_file->substream;
3423         struct snd_pcm_runtime *runtime = substream->runtime;
3424         unsigned long offset = pgoff << PAGE_SHIFT;
3425
3426         switch (offset) {
3427         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3428                 return (unsigned long)runtime->status;
3429         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3430                 return (unsigned long)runtime->control;
3431         default:
3432                 return (unsigned long)runtime->dma_area + offset;
3433         }
3434 }
3435 #else
3436 # define snd_pcm_get_unmapped_area NULL
3437 #endif
3438
3439 /*
3440  *  Register section
3441  */
3442
3443 const struct file_operations snd_pcm_f_ops[2] = {
3444         {
3445                 .owner =                THIS_MODULE,
3446                 .write =                snd_pcm_write,
3447                 .aio_write =            snd_pcm_aio_write,
3448                 .open =                 snd_pcm_playback_open,
3449                 .release =              snd_pcm_release,
3450                 .llseek =               no_llseek,
3451                 .poll =                 snd_pcm_playback_poll,
3452                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3453                 .compat_ioctl =         snd_pcm_ioctl_compat,
3454                 .mmap =                 snd_pcm_mmap,
3455                 .fasync =               snd_pcm_fasync,
3456                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3457         },
3458         {
3459                 .owner =                THIS_MODULE,
3460                 .read =                 snd_pcm_read,
3461                 .aio_read =             snd_pcm_aio_read,
3462                 .open =                 snd_pcm_capture_open,
3463                 .release =              snd_pcm_release,
3464                 .llseek =               no_llseek,
3465                 .poll =                 snd_pcm_capture_poll,
3466                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3467                 .compat_ioctl =         snd_pcm_ioctl_compat,
3468                 .mmap =                 snd_pcm_mmap,
3469                 .fasync =               snd_pcm_fasync,
3470                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3471         }
3472 };